1 /* DWARF 2 debugging format support for GDB. 2 3 Copyright (C) 1994-2020 Free Software Foundation, Inc. 4 5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology, 6 Inc. with support from Florida State University (under contract 7 with the Ada Joint Program Office), and Silicon Graphics, Inc. 8 Initial contribution by Brent Benson, Harris Computer Systems, Inc., 9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1 10 support. 11 12 This file is part of GDB. 13 14 This program is free software; you can redistribute it and/or modify 15 it under the terms of the GNU General Public License as published by 16 the Free Software Foundation; either version 3 of the License, or 17 (at your option) any later version. 18 19 This program is distributed in the hope that it will be useful, 20 but WITHOUT ANY WARRANTY; without even the implied warranty of 21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 GNU General Public License for more details. 23 24 You should have received a copy of the GNU General Public License 25 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 26 27 /* FIXME: Various die-reading functions need to be more careful with 28 reading off the end of the section. 29 E.g., load_partial_dies, read_partial_die. */ 30 31 #include "defs.h" 32 #include "dwarf2/read.h" 33 #include "dwarf2/abbrev.h" 34 #include "dwarf2/attribute.h" 35 #include "dwarf2/comp-unit.h" 36 #include "dwarf2/index-cache.h" 37 #include "dwarf2/index-common.h" 38 #include "dwarf2/leb.h" 39 #include "dwarf2/line-header.h" 40 #include "dwarf2/dwz.h" 41 #include "dwarf2/macro.h" 42 #include "dwarf2/die.h" 43 #include "dwarf2/stringify.h" 44 #include "bfd.h" 45 #include "elf-bfd.h" 46 #include "symtab.h" 47 #include "gdbtypes.h" 48 #include "objfiles.h" 49 #include "dwarf2.h" 50 #include "buildsym.h" 51 #include "demangle.h" 52 #include "gdb-demangle.h" 53 #include "filenames.h" /* for DOSish file names */ 54 #include "language.h" 55 #include "complaints.h" 56 #include "dwarf2/expr.h" 57 #include "dwarf2/loc.h" 58 #include "cp-support.h" 59 #include "hashtab.h" 60 #include "command.h" 61 #include "gdbcmd.h" 62 #include "block.h" 63 #include "addrmap.h" 64 #include "typeprint.h" 65 #include "psympriv.h" 66 #include "c-lang.h" 67 #include "go-lang.h" 68 #include "valprint.h" 69 #include "gdbcore.h" /* for gnutarget */ 70 #include "gdb/gdb-index.h" 71 #include "gdb_bfd.h" 72 #include "f-lang.h" 73 #include "source.h" 74 #include "build-id.h" 75 #include "namespace.h" 76 #include "gdbsupport/function-view.h" 77 #include "gdbsupport/gdb_optional.h" 78 #include "gdbsupport/underlying.h" 79 #include "gdbsupport/hash_enum.h" 80 #include "filename-seen-cache.h" 81 #include "producer.h" 82 #include <fcntl.h> 83 #include <algorithm> 84 #include <unordered_map> 85 #include "gdbsupport/selftest.h" 86 #include "rust-lang.h" 87 #include "gdbsupport/pathstuff.h" 88 #include "count-one-bits.h" 89 #include "debuginfod-support.h" 90 91 /* When == 1, print basic high level tracing messages. 92 When > 1, be more verbose. 93 This is in contrast to the low level DIE reading of dwarf_die_debug. */ 94 static unsigned int dwarf_read_debug = 0; 95 96 /* When non-zero, dump DIEs after they are read in. */ 97 static unsigned int dwarf_die_debug = 0; 98 99 /* When non-zero, dump line number entries as they are read in. */ 100 unsigned int dwarf_line_debug = 0; 101 102 /* When true, cross-check physname against demangler. */ 103 static bool check_physname = false; 104 105 /* When true, do not reject deprecated .gdb_index sections. */ 106 static bool use_deprecated_index_sections = false; 107 108 /* This is used to store the data that is always per objfile. */ 109 static const objfile_key<dwarf2_per_objfile> dwarf2_objfile_data_key; 110 111 /* These are used to store the dwarf2_per_bfd objects. 112 113 objfiles having the same BFD, which doesn't require relocations, are going to 114 share a dwarf2_per_bfd object, which is held in the _bfd_data_key version. 115 116 Other objfiles are not going to share a dwarf2_per_bfd with any other 117 objfiles, so they'll have their own version kept in the _objfile_data_key 118 version. */ 119 static const struct bfd_key<dwarf2_per_bfd> dwarf2_per_bfd_bfd_data_key; 120 static const struct objfile_key<dwarf2_per_bfd> dwarf2_per_bfd_objfile_data_key; 121 122 /* The "aclass" indices for various kinds of computed DWARF symbols. */ 123 124 static int dwarf2_locexpr_index; 125 static int dwarf2_loclist_index; 126 static int dwarf2_locexpr_block_index; 127 static int dwarf2_loclist_block_index; 128 129 /* Size of .debug_loclists section header for 32-bit DWARF format. */ 130 #define LOCLIST_HEADER_SIZE32 12 131 132 /* Size of .debug_loclists section header for 64-bit DWARF format. */ 133 #define LOCLIST_HEADER_SIZE64 20 134 135 /* Size of .debug_rnglists section header for 32-bit DWARF format. */ 136 #define RNGLIST_HEADER_SIZE32 12 137 138 /* Size of .debug_rnglists section header for 64-bit DWARF format. */ 139 #define RNGLIST_HEADER_SIZE64 20 140 141 /* An index into a (C++) symbol name component in a symbol name as 142 recorded in the mapped_index's symbol table. For each C++ symbol 143 in the symbol table, we record one entry for the start of each 144 component in the symbol in a table of name components, and then 145 sort the table, in order to be able to binary search symbol names, 146 ignoring leading namespaces, both completion and regular look up. 147 For example, for symbol "A::B::C", we'll have an entry that points 148 to "A::B::C", another that points to "B::C", and another for "C". 149 Note that function symbols in GDB index have no parameter 150 information, just the function/method names. You can convert a 151 name_component to a "const char *" using the 152 'mapped_index::symbol_name_at(offset_type)' method. */ 153 154 struct name_component 155 { 156 /* Offset in the symbol name where the component starts. Stored as 157 a (32-bit) offset instead of a pointer to save memory and improve 158 locality on 64-bit architectures. */ 159 offset_type name_offset; 160 161 /* The symbol's index in the symbol and constant pool tables of a 162 mapped_index. */ 163 offset_type idx; 164 }; 165 166 /* Base class containing bits shared by both .gdb_index and 167 .debug_name indexes. */ 168 169 struct mapped_index_base 170 { 171 mapped_index_base () = default; 172 DISABLE_COPY_AND_ASSIGN (mapped_index_base); 173 174 /* The name_component table (a sorted vector). See name_component's 175 description above. */ 176 std::vector<name_component> name_components; 177 178 /* How NAME_COMPONENTS is sorted. */ 179 enum case_sensitivity name_components_casing; 180 181 /* Return the number of names in the symbol table. */ 182 virtual size_t symbol_name_count () const = 0; 183 184 /* Get the name of the symbol at IDX in the symbol table. */ 185 virtual const char *symbol_name_at 186 (offset_type idx, dwarf2_per_objfile *per_objfile) const = 0; 187 188 /* Return whether the name at IDX in the symbol table should be 189 ignored. */ 190 virtual bool symbol_name_slot_invalid (offset_type idx) const 191 { 192 return false; 193 } 194 195 /* Build the symbol name component sorted vector, if we haven't 196 yet. */ 197 void build_name_components (dwarf2_per_objfile *per_objfile); 198 199 /* Returns the lower (inclusive) and upper (exclusive) bounds of the 200 possible matches for LN_NO_PARAMS in the name component 201 vector. */ 202 std::pair<std::vector<name_component>::const_iterator, 203 std::vector<name_component>::const_iterator> 204 find_name_components_bounds (const lookup_name_info &ln_no_params, 205 enum language lang, 206 dwarf2_per_objfile *per_objfile) const; 207 208 /* Prevent deleting/destroying via a base class pointer. */ 209 protected: 210 ~mapped_index_base() = default; 211 }; 212 213 /* A description of the mapped index. The file format is described in 214 a comment by the code that writes the index. */ 215 struct mapped_index final : public mapped_index_base 216 { 217 /* A slot/bucket in the symbol table hash. */ 218 struct symbol_table_slot 219 { 220 const offset_type name; 221 const offset_type vec; 222 }; 223 224 /* Index data format version. */ 225 int version = 0; 226 227 /* The address table data. */ 228 gdb::array_view<const gdb_byte> address_table; 229 230 /* The symbol table, implemented as a hash table. */ 231 gdb::array_view<symbol_table_slot> symbol_table; 232 233 /* A pointer to the constant pool. */ 234 const char *constant_pool = nullptr; 235 236 bool symbol_name_slot_invalid (offset_type idx) const override 237 { 238 const auto &bucket = this->symbol_table[idx]; 239 return bucket.name == 0 && bucket.vec == 0; 240 } 241 242 /* Convenience method to get at the name of the symbol at IDX in the 243 symbol table. */ 244 const char *symbol_name_at 245 (offset_type idx, dwarf2_per_objfile *per_objfile) const override 246 { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx].name); } 247 248 size_t symbol_name_count () const override 249 { return this->symbol_table.size (); } 250 }; 251 252 /* A description of the mapped .debug_names. 253 Uninitialized map has CU_COUNT 0. */ 254 struct mapped_debug_names final : public mapped_index_base 255 { 256 bfd_endian dwarf5_byte_order; 257 bool dwarf5_is_dwarf64; 258 bool augmentation_is_gdb; 259 uint8_t offset_size; 260 uint32_t cu_count = 0; 261 uint32_t tu_count, bucket_count, name_count; 262 const gdb_byte *cu_table_reordered, *tu_table_reordered; 263 const uint32_t *bucket_table_reordered, *hash_table_reordered; 264 const gdb_byte *name_table_string_offs_reordered; 265 const gdb_byte *name_table_entry_offs_reordered; 266 const gdb_byte *entry_pool; 267 268 struct index_val 269 { 270 ULONGEST dwarf_tag; 271 struct attr 272 { 273 /* Attribute name DW_IDX_*. */ 274 ULONGEST dw_idx; 275 276 /* Attribute form DW_FORM_*. */ 277 ULONGEST form; 278 279 /* Value if FORM is DW_FORM_implicit_const. */ 280 LONGEST implicit_const; 281 }; 282 std::vector<attr> attr_vec; 283 }; 284 285 std::unordered_map<ULONGEST, index_val> abbrev_map; 286 287 const char *namei_to_name 288 (uint32_t namei, dwarf2_per_objfile *per_objfile) const; 289 290 /* Implementation of the mapped_index_base virtual interface, for 291 the name_components cache. */ 292 293 const char *symbol_name_at 294 (offset_type idx, dwarf2_per_objfile *per_objfile) const override 295 { return namei_to_name (idx, per_objfile); } 296 297 size_t symbol_name_count () const override 298 { return this->name_count; } 299 }; 300 301 /* See dwarf2read.h. */ 302 303 dwarf2_per_objfile * 304 get_dwarf2_per_objfile (struct objfile *objfile) 305 { 306 return dwarf2_objfile_data_key.get (objfile); 307 } 308 309 /* Default names of the debugging sections. */ 310 311 /* Note that if the debugging section has been compressed, it might 312 have a name like .zdebug_info. */ 313 314 static const struct dwarf2_debug_sections dwarf2_elf_names = 315 { 316 { ".debug_info", ".zdebug_info" }, 317 { ".debug_abbrev", ".zdebug_abbrev" }, 318 { ".debug_line", ".zdebug_line" }, 319 { ".debug_loc", ".zdebug_loc" }, 320 { ".debug_loclists", ".zdebug_loclists" }, 321 { ".debug_macinfo", ".zdebug_macinfo" }, 322 { ".debug_macro", ".zdebug_macro" }, 323 { ".debug_str", ".zdebug_str" }, 324 { ".debug_str_offsets", ".zdebug_str_offsets" }, 325 { ".debug_line_str", ".zdebug_line_str" }, 326 { ".debug_ranges", ".zdebug_ranges" }, 327 { ".debug_rnglists", ".zdebug_rnglists" }, 328 { ".debug_types", ".zdebug_types" }, 329 { ".debug_addr", ".zdebug_addr" }, 330 { ".debug_frame", ".zdebug_frame" }, 331 { ".eh_frame", NULL }, 332 { ".gdb_index", ".zgdb_index" }, 333 { ".debug_names", ".zdebug_names" }, 334 { ".debug_aranges", ".zdebug_aranges" }, 335 23 336 }; 337 338 /* List of DWO/DWP sections. */ 339 340 static const struct dwop_section_names 341 { 342 struct dwarf2_section_names abbrev_dwo; 343 struct dwarf2_section_names info_dwo; 344 struct dwarf2_section_names line_dwo; 345 struct dwarf2_section_names loc_dwo; 346 struct dwarf2_section_names loclists_dwo; 347 struct dwarf2_section_names macinfo_dwo; 348 struct dwarf2_section_names macro_dwo; 349 struct dwarf2_section_names rnglists_dwo; 350 struct dwarf2_section_names str_dwo; 351 struct dwarf2_section_names str_offsets_dwo; 352 struct dwarf2_section_names types_dwo; 353 struct dwarf2_section_names cu_index; 354 struct dwarf2_section_names tu_index; 355 } 356 dwop_section_names = 357 { 358 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" }, 359 { ".debug_info.dwo", ".zdebug_info.dwo" }, 360 { ".debug_line.dwo", ".zdebug_line.dwo" }, 361 { ".debug_loc.dwo", ".zdebug_loc.dwo" }, 362 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" }, 363 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" }, 364 { ".debug_macro.dwo", ".zdebug_macro.dwo" }, 365 { ".debug_rnglists.dwo", ".zdebug_rnglists.dwo" }, 366 { ".debug_str.dwo", ".zdebug_str.dwo" }, 367 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" }, 368 { ".debug_types.dwo", ".zdebug_types.dwo" }, 369 { ".debug_cu_index", ".zdebug_cu_index" }, 370 { ".debug_tu_index", ".zdebug_tu_index" }, 371 }; 372 373 /* local data types */ 374 375 /* The location list and range list sections (.debug_loclists & .debug_rnglists) 376 begin with a header, which contains the following information. */ 377 struct loclists_rnglists_header 378 { 379 /* A 4-byte or 12-byte length containing the length of the 380 set of entries for this compilation unit, not including the 381 length field itself. */ 382 unsigned int length; 383 384 /* A 2-byte version identifier. */ 385 short version; 386 387 /* A 1-byte unsigned integer containing the size in bytes of an address on 388 the target system. */ 389 unsigned char addr_size; 390 391 /* A 1-byte unsigned integer containing the size in bytes of a segment selector 392 on the target system. */ 393 unsigned char segment_collector_size; 394 395 /* A 4-byte count of the number of offsets that follow the header. */ 396 unsigned int offset_entry_count; 397 }; 398 399 /* Type used for delaying computation of method physnames. 400 See comments for compute_delayed_physnames. */ 401 struct delayed_method_info 402 { 403 /* The type to which the method is attached, i.e., its parent class. */ 404 struct type *type; 405 406 /* The index of the method in the type's function fieldlists. */ 407 int fnfield_index; 408 409 /* The index of the method in the fieldlist. */ 410 int index; 411 412 /* The name of the DIE. */ 413 const char *name; 414 415 /* The DIE associated with this method. */ 416 struct die_info *die; 417 }; 418 419 /* Internal state when decoding a particular compilation unit. */ 420 struct dwarf2_cu 421 { 422 explicit dwarf2_cu (dwarf2_per_cu_data *per_cu, 423 dwarf2_per_objfile *per_objfile); 424 425 DISABLE_COPY_AND_ASSIGN (dwarf2_cu); 426 427 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope. 428 Create the set of symtabs used by this TU, or if this TU is sharing 429 symtabs with another TU and the symtabs have already been created 430 then restore those symtabs in the line header. 431 We don't need the pc/line-number mapping for type units. */ 432 void setup_type_unit_groups (struct die_info *die); 433 434 /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the 435 buildsym_compunit constructor. */ 436 struct compunit_symtab *start_symtab (const char *name, 437 const char *comp_dir, 438 CORE_ADDR low_pc); 439 440 /* Reset the builder. */ 441 void reset_builder () { m_builder.reset (); } 442 443 /* Return a type that is a generic pointer type, the size of which 444 matches the address size given in the compilation unit header for 445 this CU. */ 446 struct type *addr_type () const; 447 448 /* Find an integer type the same size as the address size given in 449 the compilation unit header for this CU. UNSIGNED_P controls if 450 the integer is unsigned or not. */ 451 struct type *addr_sized_int_type (bool unsigned_p) const; 452 453 /* The header of the compilation unit. */ 454 struct comp_unit_head header {}; 455 456 /* Base address of this compilation unit. */ 457 gdb::optional<CORE_ADDR> base_address; 458 459 /* The language we are debugging. */ 460 enum language language = language_unknown; 461 const struct language_defn *language_defn = nullptr; 462 463 const char *producer = nullptr; 464 465 private: 466 /* The symtab builder for this CU. This is only non-NULL when full 467 symbols are being read. */ 468 std::unique_ptr<buildsym_compunit> m_builder; 469 470 public: 471 /* The generic symbol table building routines have separate lists for 472 file scope symbols and all all other scopes (local scopes). So 473 we need to select the right one to pass to add_symbol_to_list(). 474 We do it by keeping a pointer to the correct list in list_in_scope. 475 476 FIXME: The original dwarf code just treated the file scope as the 477 first local scope, and all other local scopes as nested local 478 scopes, and worked fine. Check to see if we really need to 479 distinguish these in buildsym.c. */ 480 struct pending **list_in_scope = nullptr; 481 482 /* Hash table holding all the loaded partial DIEs 483 with partial_die->offset.SECT_OFF as hash. */ 484 htab_t partial_dies = nullptr; 485 486 /* Storage for things with the same lifetime as this read-in compilation 487 unit, including partial DIEs. */ 488 auto_obstack comp_unit_obstack; 489 490 /* Backlink to our per_cu entry. */ 491 struct dwarf2_per_cu_data *per_cu; 492 493 /* The dwarf2_per_objfile that owns this. */ 494 dwarf2_per_objfile *per_objfile; 495 496 /* How many compilation units ago was this CU last referenced? */ 497 int last_used = 0; 498 499 /* A hash table of DIE cu_offset for following references with 500 die_info->offset.sect_off as hash. */ 501 htab_t die_hash = nullptr; 502 503 /* Full DIEs if read in. */ 504 struct die_info *dies = nullptr; 505 506 /* A set of pointers to dwarf2_per_cu_data objects for compilation 507 units referenced by this one. Only set during full symbol processing; 508 partial symbol tables do not have dependencies. */ 509 htab_t dependencies = nullptr; 510 511 /* Header data from the line table, during full symbol processing. */ 512 struct line_header *line_header = nullptr; 513 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise, 514 it's owned by dwarf2_per_bfd::line_header_hash. If non-NULL, 515 this is the DW_TAG_compile_unit die for this CU. We'll hold on 516 to the line header as long as this DIE is being processed. See 517 process_die_scope. */ 518 die_info *line_header_die_owner = nullptr; 519 520 /* A list of methods which need to have physnames computed 521 after all type information has been read. */ 522 std::vector<delayed_method_info> method_list; 523 524 /* To be copied to symtab->call_site_htab. */ 525 htab_t call_site_htab = nullptr; 526 527 /* Non-NULL if this CU came from a DWO file. 528 There is an invariant here that is important to remember: 529 Except for attributes copied from the top level DIE in the "main" 530 (or "stub") file in preparation for reading the DWO file 531 (e.g., DW_AT_addr_base), we KISS: there is only *one* CU. 532 Either there isn't a DWO file (in which case this is NULL and the point 533 is moot), or there is and either we're not going to read it (in which 534 case this is NULL) or there is and we are reading it (in which case this 535 is non-NULL). */ 536 struct dwo_unit *dwo_unit = nullptr; 537 538 /* The DW_AT_addr_base (DW_AT_GNU_addr_base) attribute if present. 539 Note this value comes from the Fission stub CU/TU's DIE. */ 540 gdb::optional<ULONGEST> addr_base; 541 542 /* The DW_AT_rnglists_base attribute if present. 543 Note this value comes from the Fission stub CU/TU's DIE. 544 Also note that the value is zero in the non-DWO case so this value can 545 be used without needing to know whether DWO files are in use or not. 546 N.B. This does not apply to DW_AT_ranges appearing in 547 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever 548 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then 549 DW_AT_rnglists_base *would* have to be applied, and we'd have to care 550 whether the DW_AT_ranges attribute came from the skeleton or DWO. */ 551 ULONGEST ranges_base = 0; 552 553 /* The DW_AT_loclists_base attribute if present. */ 554 ULONGEST loclist_base = 0; 555 556 /* When reading debug info generated by older versions of rustc, we 557 have to rewrite some union types to be struct types with a 558 variant part. This rewriting must be done after the CU is fully 559 read in, because otherwise at the point of rewriting some struct 560 type might not have been fully processed. So, we keep a list of 561 all such types here and process them after expansion. */ 562 std::vector<struct type *> rust_unions; 563 564 /* The DW_AT_str_offsets_base attribute if present. For DWARF 4 version DWO 565 files, the value is implicitly zero. For DWARF 5 version DWO files, the 566 value is often implicit and is the size of the header of 567 .debug_str_offsets section (8 or 4, depending on the address size). */ 568 gdb::optional<ULONGEST> str_offsets_base; 569 570 /* Mark used when releasing cached dies. */ 571 bool mark : 1; 572 573 /* This CU references .debug_loc. See the symtab->locations_valid field. 574 This test is imperfect as there may exist optimized debug code not using 575 any location list and still facing inlining issues if handled as 576 unoptimized code. For a future better test see GCC PR other/32998. */ 577 bool has_loclist : 1; 578 579 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is true 580 if all the producer_is_* fields are valid. This information is cached 581 because profiling CU expansion showed excessive time spent in 582 producer_is_gxx_lt_4_6. */ 583 bool checked_producer : 1; 584 bool producer_is_gxx_lt_4_6 : 1; 585 bool producer_is_gcc_lt_4_3 : 1; 586 bool producer_is_icc : 1; 587 bool producer_is_icc_lt_14 : 1; 588 bool producer_is_codewarrior : 1; 589 590 /* When true, the file that we're processing is known to have 591 debugging info for C++ namespaces. GCC 3.3.x did not produce 592 this information, but later versions do. */ 593 594 bool processing_has_namespace_info : 1; 595 596 struct partial_die_info *find_partial_die (sect_offset sect_off); 597 598 /* If this CU was inherited by another CU (via specification, 599 abstract_origin, etc), this is the ancestor CU. */ 600 dwarf2_cu *ancestor; 601 602 /* Get the buildsym_compunit for this CU. */ 603 buildsym_compunit *get_builder () 604 { 605 /* If this CU has a builder associated with it, use that. */ 606 if (m_builder != nullptr) 607 return m_builder.get (); 608 609 /* Otherwise, search ancestors for a valid builder. */ 610 if (ancestor != nullptr) 611 return ancestor->get_builder (); 612 613 return nullptr; 614 } 615 }; 616 617 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list. 618 This includes type_unit_group and quick_file_names. */ 619 620 struct stmt_list_hash 621 { 622 /* The DWO unit this table is from or NULL if there is none. */ 623 struct dwo_unit *dwo_unit; 624 625 /* Offset in .debug_line or .debug_line.dwo. */ 626 sect_offset line_sect_off; 627 }; 628 629 /* Each element of dwarf2_per_bfd->type_unit_groups is a pointer to 630 an object of this type. This contains elements of type unit groups 631 that can be shared across objfiles. The non-shareable parts are in 632 type_unit_group_unshareable. */ 633 634 struct type_unit_group 635 { 636 /* dwarf2read.c's main "handle" on a TU symtab. 637 To simplify things we create an artificial CU that "includes" all the 638 type units using this stmt_list so that the rest of the code still has 639 a "per_cu" handle on the symtab. */ 640 struct dwarf2_per_cu_data per_cu; 641 642 /* The TUs that share this DW_AT_stmt_list entry. 643 This is added to while parsing type units to build partial symtabs, 644 and is deleted afterwards and not used again. */ 645 std::vector<signatured_type *> *tus; 646 647 /* The data used to construct the hash key. */ 648 struct stmt_list_hash hash; 649 }; 650 651 /* These sections are what may appear in a (real or virtual) DWO file. */ 652 653 struct dwo_sections 654 { 655 struct dwarf2_section_info abbrev; 656 struct dwarf2_section_info line; 657 struct dwarf2_section_info loc; 658 struct dwarf2_section_info loclists; 659 struct dwarf2_section_info macinfo; 660 struct dwarf2_section_info macro; 661 struct dwarf2_section_info rnglists; 662 struct dwarf2_section_info str; 663 struct dwarf2_section_info str_offsets; 664 /* In the case of a virtual DWO file, these two are unused. */ 665 struct dwarf2_section_info info; 666 std::vector<dwarf2_section_info> types; 667 }; 668 669 /* CUs/TUs in DWP/DWO files. */ 670 671 struct dwo_unit 672 { 673 /* Backlink to the containing struct dwo_file. */ 674 struct dwo_file *dwo_file; 675 676 /* The "id" that distinguishes this CU/TU. 677 .debug_info calls this "dwo_id", .debug_types calls this "signature". 678 Since signatures came first, we stick with it for consistency. */ 679 ULONGEST signature; 680 681 /* The section this CU/TU lives in, in the DWO file. */ 682 struct dwarf2_section_info *section; 683 684 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */ 685 sect_offset sect_off; 686 unsigned int length; 687 688 /* For types, offset in the type's DIE of the type defined by this TU. */ 689 cu_offset type_offset_in_tu; 690 }; 691 692 /* include/dwarf2.h defines the DWP section codes. 693 It defines a max value but it doesn't define a min value, which we 694 use for error checking, so provide one. */ 695 696 enum dwp_v2_section_ids 697 { 698 DW_SECT_MIN = 1 699 }; 700 701 /* Data for one DWO file. 702 703 This includes virtual DWO files (a virtual DWO file is a DWO file as it 704 appears in a DWP file). DWP files don't really have DWO files per se - 705 comdat folding of types "loses" the DWO file they came from, and from 706 a high level view DWP files appear to contain a mass of random types. 707 However, to maintain consistency with the non-DWP case we pretend DWP 708 files contain virtual DWO files, and we assign each TU with one virtual 709 DWO file (generally based on the line and abbrev section offsets - 710 a heuristic that seems to work in practice). */ 711 712 struct dwo_file 713 { 714 dwo_file () = default; 715 DISABLE_COPY_AND_ASSIGN (dwo_file); 716 717 /* The DW_AT_GNU_dwo_name or DW_AT_dwo_name attribute. 718 For virtual DWO files the name is constructed from the section offsets 719 of abbrev,line,loc,str_offsets so that we combine virtual DWO files 720 from related CU+TUs. */ 721 const char *dwo_name = nullptr; 722 723 /* The DW_AT_comp_dir attribute. */ 724 const char *comp_dir = nullptr; 725 726 /* The bfd, when the file is open. Otherwise this is NULL. 727 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */ 728 gdb_bfd_ref_ptr dbfd; 729 730 /* The sections that make up this DWO file. 731 Remember that for virtual DWO files in DWP V2 or DWP V5, these are virtual 732 sections (for lack of a better name). */ 733 struct dwo_sections sections {}; 734 735 /* The CUs in the file. 736 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as 737 an extension to handle LLVM's Link Time Optimization output (where 738 multiple source files may be compiled into a single object/dwo pair). */ 739 htab_up cus; 740 741 /* Table of TUs in the file. 742 Each element is a struct dwo_unit. */ 743 htab_up tus; 744 }; 745 746 /* These sections are what may appear in a DWP file. */ 747 748 struct dwp_sections 749 { 750 /* These are used by all DWP versions (1, 2 and 5). */ 751 struct dwarf2_section_info str; 752 struct dwarf2_section_info cu_index; 753 struct dwarf2_section_info tu_index; 754 755 /* These are only used by DWP version 2 and version 5 files. 756 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other 757 sections are referenced by section number, and are not recorded here. 758 In DWP version 2 or 5 there is at most one copy of all these sections, 759 each section being (effectively) comprised of the concatenation of all of 760 the individual sections that exist in the version 1 format. 761 To keep the code simple we treat each of these concatenated pieces as a 762 section itself (a virtual section?). */ 763 struct dwarf2_section_info abbrev; 764 struct dwarf2_section_info info; 765 struct dwarf2_section_info line; 766 struct dwarf2_section_info loc; 767 struct dwarf2_section_info loclists; 768 struct dwarf2_section_info macinfo; 769 struct dwarf2_section_info macro; 770 struct dwarf2_section_info rnglists; 771 struct dwarf2_section_info str_offsets; 772 struct dwarf2_section_info types; 773 }; 774 775 /* These sections are what may appear in a virtual DWO file in DWP version 1. 776 A virtual DWO file is a DWO file as it appears in a DWP file. */ 777 778 struct virtual_v1_dwo_sections 779 { 780 struct dwarf2_section_info abbrev; 781 struct dwarf2_section_info line; 782 struct dwarf2_section_info loc; 783 struct dwarf2_section_info macinfo; 784 struct dwarf2_section_info macro; 785 struct dwarf2_section_info str_offsets; 786 /* Each DWP hash table entry records one CU or one TU. 787 That is recorded here, and copied to dwo_unit.section. */ 788 struct dwarf2_section_info info_or_types; 789 }; 790 791 /* Similar to virtual_v1_dwo_sections, but for DWP version 2 or 5. 792 In version 2, the sections of the DWO files are concatenated together 793 and stored in one section of that name. Thus each ELF section contains 794 several "virtual" sections. */ 795 796 struct virtual_v2_or_v5_dwo_sections 797 { 798 bfd_size_type abbrev_offset; 799 bfd_size_type abbrev_size; 800 801 bfd_size_type line_offset; 802 bfd_size_type line_size; 803 804 bfd_size_type loc_offset; 805 bfd_size_type loc_size; 806 807 bfd_size_type loclists_offset; 808 bfd_size_type loclists_size; 809 810 bfd_size_type macinfo_offset; 811 bfd_size_type macinfo_size; 812 813 bfd_size_type macro_offset; 814 bfd_size_type macro_size; 815 816 bfd_size_type rnglists_offset; 817 bfd_size_type rnglists_size; 818 819 bfd_size_type str_offsets_offset; 820 bfd_size_type str_offsets_size; 821 822 /* Each DWP hash table entry records one CU or one TU. 823 That is recorded here, and copied to dwo_unit.section. */ 824 bfd_size_type info_or_types_offset; 825 bfd_size_type info_or_types_size; 826 }; 827 828 /* Contents of DWP hash tables. */ 829 830 struct dwp_hash_table 831 { 832 uint32_t version, nr_columns; 833 uint32_t nr_units, nr_slots; 834 const gdb_byte *hash_table, *unit_table; 835 union 836 { 837 struct 838 { 839 const gdb_byte *indices; 840 } v1; 841 struct 842 { 843 /* This is indexed by column number and gives the id of the section 844 in that column. */ 845 #define MAX_NR_V2_DWO_SECTIONS \ 846 (1 /* .debug_info or .debug_types */ \ 847 + 1 /* .debug_abbrev */ \ 848 + 1 /* .debug_line */ \ 849 + 1 /* .debug_loc */ \ 850 + 1 /* .debug_str_offsets */ \ 851 + 1 /* .debug_macro or .debug_macinfo */) 852 int section_ids[MAX_NR_V2_DWO_SECTIONS]; 853 const gdb_byte *offsets; 854 const gdb_byte *sizes; 855 } v2; 856 struct 857 { 858 /* This is indexed by column number and gives the id of the section 859 in that column. */ 860 #define MAX_NR_V5_DWO_SECTIONS \ 861 (1 /* .debug_info */ \ 862 + 1 /* .debug_abbrev */ \ 863 + 1 /* .debug_line */ \ 864 + 1 /* .debug_loclists */ \ 865 + 1 /* .debug_str_offsets */ \ 866 + 1 /* .debug_macro */ \ 867 + 1 /* .debug_rnglists */) 868 int section_ids[MAX_NR_V5_DWO_SECTIONS]; 869 const gdb_byte *offsets; 870 const gdb_byte *sizes; 871 } v5; 872 } section_pool; 873 }; 874 875 /* Data for one DWP file. */ 876 877 struct dwp_file 878 { 879 dwp_file (const char *name_, gdb_bfd_ref_ptr &&abfd) 880 : name (name_), 881 dbfd (std::move (abfd)) 882 { 883 } 884 885 /* Name of the file. */ 886 const char *name; 887 888 /* File format version. */ 889 int version = 0; 890 891 /* The bfd. */ 892 gdb_bfd_ref_ptr dbfd; 893 894 /* Section info for this file. */ 895 struct dwp_sections sections {}; 896 897 /* Table of CUs in the file. */ 898 const struct dwp_hash_table *cus = nullptr; 899 900 /* Table of TUs in the file. */ 901 const struct dwp_hash_table *tus = nullptr; 902 903 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */ 904 htab_up loaded_cus; 905 htab_up loaded_tus; 906 907 /* Table to map ELF section numbers to their sections. 908 This is only needed for the DWP V1 file format. */ 909 unsigned int num_sections = 0; 910 asection **elf_sections = nullptr; 911 }; 912 913 /* Struct used to pass misc. parameters to read_die_and_children, et 914 al. which are used for both .debug_info and .debug_types dies. 915 All parameters here are unchanging for the life of the call. This 916 struct exists to abstract away the constant parameters of die reading. */ 917 918 struct die_reader_specs 919 { 920 /* The bfd of die_section. */ 921 bfd* abfd; 922 923 /* The CU of the DIE we are parsing. */ 924 struct dwarf2_cu *cu; 925 926 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */ 927 struct dwo_file *dwo_file; 928 929 /* The section the die comes from. 930 This is either .debug_info or .debug_types, or the .dwo variants. */ 931 struct dwarf2_section_info *die_section; 932 933 /* die_section->buffer. */ 934 const gdb_byte *buffer; 935 936 /* The end of the buffer. */ 937 const gdb_byte *buffer_end; 938 939 /* The abbreviation table to use when reading the DIEs. */ 940 struct abbrev_table *abbrev_table; 941 }; 942 943 /* A subclass of die_reader_specs that holds storage and has complex 944 constructor and destructor behavior. */ 945 946 class cutu_reader : public die_reader_specs 947 { 948 public: 949 950 cutu_reader (dwarf2_per_cu_data *this_cu, 951 dwarf2_per_objfile *per_objfile, 952 struct abbrev_table *abbrev_table, 953 dwarf2_cu *existing_cu, 954 bool skip_partial); 955 956 explicit cutu_reader (struct dwarf2_per_cu_data *this_cu, 957 dwarf2_per_objfile *per_objfile, 958 struct dwarf2_cu *parent_cu = nullptr, 959 struct dwo_file *dwo_file = nullptr); 960 961 DISABLE_COPY_AND_ASSIGN (cutu_reader); 962 963 const gdb_byte *info_ptr = nullptr; 964 struct die_info *comp_unit_die = nullptr; 965 bool dummy_p = false; 966 967 /* Release the new CU, putting it on the chain. This cannot be done 968 for dummy CUs. */ 969 void keep (); 970 971 private: 972 void init_tu_and_read_dwo_dies (dwarf2_per_cu_data *this_cu, 973 dwarf2_per_objfile *per_objfile, 974 dwarf2_cu *existing_cu); 975 976 struct dwarf2_per_cu_data *m_this_cu; 977 std::unique_ptr<dwarf2_cu> m_new_cu; 978 979 /* The ordinary abbreviation table. */ 980 abbrev_table_up m_abbrev_table_holder; 981 982 /* The DWO abbreviation table. */ 983 abbrev_table_up m_dwo_abbrev_table; 984 }; 985 986 /* When we construct a partial symbol table entry we only 987 need this much information. */ 988 struct partial_die_info : public allocate_on_obstack 989 { 990 partial_die_info (sect_offset sect_off, struct abbrev_info *abbrev); 991 992 /* Disable assign but still keep copy ctor, which is needed 993 load_partial_dies. */ 994 partial_die_info& operator=(const partial_die_info& rhs) = delete; 995 996 /* Adjust the partial die before generating a symbol for it. This 997 function may set the is_external flag or change the DIE's 998 name. */ 999 void fixup (struct dwarf2_cu *cu); 1000 1001 /* Read a minimal amount of information into the minimal die 1002 structure. */ 1003 const gdb_byte *read (const struct die_reader_specs *reader, 1004 const struct abbrev_info &abbrev, 1005 const gdb_byte *info_ptr); 1006 1007 /* Compute the name of this partial DIE. This memoizes the 1008 result, so it is safe to call multiple times. */ 1009 const char *name (dwarf2_cu *cu); 1010 1011 /* Offset of this DIE. */ 1012 const sect_offset sect_off; 1013 1014 /* DWARF-2 tag for this DIE. */ 1015 const ENUM_BITFIELD(dwarf_tag) tag : 16; 1016 1017 /* Assorted flags describing the data found in this DIE. */ 1018 const unsigned int has_children : 1; 1019 1020 unsigned int is_external : 1; 1021 unsigned int is_declaration : 1; 1022 unsigned int has_type : 1; 1023 unsigned int has_specification : 1; 1024 unsigned int has_pc_info : 1; 1025 unsigned int may_be_inlined : 1; 1026 1027 /* This DIE has been marked DW_AT_main_subprogram. */ 1028 unsigned int main_subprogram : 1; 1029 1030 /* Flag set if the SCOPE field of this structure has been 1031 computed. */ 1032 unsigned int scope_set : 1; 1033 1034 /* Flag set if the DIE has a byte_size attribute. */ 1035 unsigned int has_byte_size : 1; 1036 1037 /* Flag set if the DIE has a DW_AT_const_value attribute. */ 1038 unsigned int has_const_value : 1; 1039 1040 /* Flag set if any of the DIE's children are template arguments. */ 1041 unsigned int has_template_arguments : 1; 1042 1043 /* Flag set if fixup has been called on this die. */ 1044 unsigned int fixup_called : 1; 1045 1046 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */ 1047 unsigned int is_dwz : 1; 1048 1049 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */ 1050 unsigned int spec_is_dwz : 1; 1051 1052 unsigned int canonical_name : 1; 1053 1054 /* The name of this DIE. Normally the value of DW_AT_name, but 1055 sometimes a default name for unnamed DIEs. */ 1056 const char *raw_name = nullptr; 1057 1058 /* The linkage name, if present. */ 1059 const char *linkage_name = nullptr; 1060 1061 /* The scope to prepend to our children. This is generally 1062 allocated on the comp_unit_obstack, so will disappear 1063 when this compilation unit leaves the cache. */ 1064 const char *scope = nullptr; 1065 1066 /* Some data associated with the partial DIE. The tag determines 1067 which field is live. */ 1068 union 1069 { 1070 /* The location description associated with this DIE, if any. */ 1071 struct dwarf_block *locdesc; 1072 /* The offset of an import, for DW_TAG_imported_unit. */ 1073 sect_offset sect_off; 1074 } d {}; 1075 1076 /* If HAS_PC_INFO, the PC range associated with this DIE. */ 1077 CORE_ADDR lowpc = 0; 1078 CORE_ADDR highpc = 0; 1079 1080 /* Pointer into the info_buffer (or types_buffer) pointing at the target of 1081 DW_AT_sibling, if any. */ 1082 /* NOTE: This member isn't strictly necessary, partial_die_info::read 1083 could return DW_AT_sibling values to its caller load_partial_dies. */ 1084 const gdb_byte *sibling = nullptr; 1085 1086 /* If HAS_SPECIFICATION, the offset of the DIE referred to by 1087 DW_AT_specification (or DW_AT_abstract_origin or 1088 DW_AT_extension). */ 1089 sect_offset spec_offset {}; 1090 1091 /* Pointers to this DIE's parent, first child, and next sibling, 1092 if any. */ 1093 struct partial_die_info *die_parent = nullptr; 1094 struct partial_die_info *die_child = nullptr; 1095 struct partial_die_info *die_sibling = nullptr; 1096 1097 friend struct partial_die_info * 1098 dwarf2_cu::find_partial_die (sect_offset sect_off); 1099 1100 private: 1101 /* Only need to do look up in dwarf2_cu::find_partial_die. */ 1102 partial_die_info (sect_offset sect_off) 1103 : partial_die_info (sect_off, DW_TAG_padding, 0) 1104 { 1105 } 1106 1107 partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_, 1108 int has_children_) 1109 : sect_off (sect_off_), tag (tag_), has_children (has_children_) 1110 { 1111 is_external = 0; 1112 is_declaration = 0; 1113 has_type = 0; 1114 has_specification = 0; 1115 has_pc_info = 0; 1116 may_be_inlined = 0; 1117 main_subprogram = 0; 1118 scope_set = 0; 1119 has_byte_size = 0; 1120 has_const_value = 0; 1121 has_template_arguments = 0; 1122 fixup_called = 0; 1123 is_dwz = 0; 1124 spec_is_dwz = 0; 1125 canonical_name = 0; 1126 } 1127 }; 1128 1129 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte, 1130 but this would require a corresponding change in unpack_field_as_long 1131 and friends. */ 1132 static int bits_per_byte = 8; 1133 1134 struct variant_part_builder; 1135 1136 /* When reading a variant, we track a bit more information about the 1137 field, and store it in an object of this type. */ 1138 1139 struct variant_field 1140 { 1141 int first_field = -1; 1142 int last_field = -1; 1143 1144 /* A variant can contain other variant parts. */ 1145 std::vector<variant_part_builder> variant_parts; 1146 1147 /* If we see a DW_TAG_variant, then this will be set if this is the 1148 default branch. */ 1149 bool default_branch = false; 1150 /* If we see a DW_AT_discr_value, then this will be the discriminant 1151 value. */ 1152 ULONGEST discriminant_value = 0; 1153 /* If we see a DW_AT_discr_list, then this is a pointer to the list 1154 data. */ 1155 struct dwarf_block *discr_list_data = nullptr; 1156 }; 1157 1158 /* This represents a DW_TAG_variant_part. */ 1159 1160 struct variant_part_builder 1161 { 1162 /* The offset of the discriminant field. */ 1163 sect_offset discriminant_offset {}; 1164 1165 /* Variants that are direct children of this variant part. */ 1166 std::vector<variant_field> variants; 1167 1168 /* True if we're currently reading a variant. */ 1169 bool processing_variant = false; 1170 }; 1171 1172 struct nextfield 1173 { 1174 int accessibility = 0; 1175 int virtuality = 0; 1176 /* Variant parts need to find the discriminant, which is a DIE 1177 reference. We track the section offset of each field to make 1178 this link. */ 1179 sect_offset offset; 1180 struct field field {}; 1181 }; 1182 1183 struct fnfieldlist 1184 { 1185 const char *name = nullptr; 1186 std::vector<struct fn_field> fnfields; 1187 }; 1188 1189 /* The routines that read and process dies for a C struct or C++ class 1190 pass lists of data member fields and lists of member function fields 1191 in an instance of a field_info structure, as defined below. */ 1192 struct field_info 1193 { 1194 /* List of data member and baseclasses fields. */ 1195 std::vector<struct nextfield> fields; 1196 std::vector<struct nextfield> baseclasses; 1197 1198 /* Set if the accessibility of one of the fields is not public. */ 1199 bool non_public_fields = false; 1200 1201 /* Member function fieldlist array, contains name of possibly overloaded 1202 member function, number of overloaded member functions and a pointer 1203 to the head of the member function field chain. */ 1204 std::vector<struct fnfieldlist> fnfieldlists; 1205 1206 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of 1207 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */ 1208 std::vector<struct decl_field> typedef_field_list; 1209 1210 /* Nested types defined by this class and the number of elements in this 1211 list. */ 1212 std::vector<struct decl_field> nested_types_list; 1213 1214 /* If non-null, this is the variant part we are currently 1215 reading. */ 1216 variant_part_builder *current_variant_part = nullptr; 1217 /* This holds all the top-level variant parts attached to the type 1218 we're reading. */ 1219 std::vector<variant_part_builder> variant_parts; 1220 1221 /* Return the total number of fields (including baseclasses). */ 1222 int nfields () const 1223 { 1224 return fields.size () + baseclasses.size (); 1225 } 1226 }; 1227 1228 /* Loaded secondary compilation units are kept in memory until they 1229 have not been referenced for the processing of this many 1230 compilation units. Set this to zero to disable caching. Cache 1231 sizes of up to at least twenty will improve startup time for 1232 typical inter-CU-reference binaries, at an obvious memory cost. */ 1233 static int dwarf_max_cache_age = 5; 1234 static void 1235 show_dwarf_max_cache_age (struct ui_file *file, int from_tty, 1236 struct cmd_list_element *c, const char *value) 1237 { 1238 fprintf_filtered (file, _("The upper bound on the age of cached " 1239 "DWARF compilation units is %s.\n"), 1240 value); 1241 } 1242 1243 /* local function prototypes */ 1244 1245 static void dwarf2_find_base_address (struct die_info *die, 1246 struct dwarf2_cu *cu); 1247 1248 static dwarf2_psymtab *create_partial_symtab 1249 (dwarf2_per_cu_data *per_cu, dwarf2_per_objfile *per_objfile, 1250 const char *name); 1251 1252 static void build_type_psymtabs_reader (const struct die_reader_specs *reader, 1253 const gdb_byte *info_ptr, 1254 struct die_info *type_unit_die); 1255 1256 static void dwarf2_build_psymtabs_hard (dwarf2_per_objfile *per_objfile); 1257 1258 static void scan_partial_symbols (struct partial_die_info *, 1259 CORE_ADDR *, CORE_ADDR *, 1260 int, struct dwarf2_cu *); 1261 1262 static void add_partial_symbol (struct partial_die_info *, 1263 struct dwarf2_cu *); 1264 1265 static void add_partial_namespace (struct partial_die_info *pdi, 1266 CORE_ADDR *lowpc, CORE_ADDR *highpc, 1267 int set_addrmap, struct dwarf2_cu *cu); 1268 1269 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, 1270 CORE_ADDR *highpc, int set_addrmap, 1271 struct dwarf2_cu *cu); 1272 1273 static void add_partial_enumeration (struct partial_die_info *enum_pdi, 1274 struct dwarf2_cu *cu); 1275 1276 static void add_partial_subprogram (struct partial_die_info *pdi, 1277 CORE_ADDR *lowpc, CORE_ADDR *highpc, 1278 int need_pc, struct dwarf2_cu *cu); 1279 1280 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *); 1281 1282 static struct partial_die_info *load_partial_dies 1283 (const struct die_reader_specs *, const gdb_byte *, int); 1284 1285 /* A pair of partial_die_info and compilation unit. */ 1286 struct cu_partial_die_info 1287 { 1288 /* The compilation unit of the partial_die_info. */ 1289 struct dwarf2_cu *cu; 1290 /* A partial_die_info. */ 1291 struct partial_die_info *pdi; 1292 1293 cu_partial_die_info (struct dwarf2_cu *cu, struct partial_die_info *pdi) 1294 : cu (cu), 1295 pdi (pdi) 1296 { /* Nothing. */ } 1297 1298 private: 1299 cu_partial_die_info () = delete; 1300 }; 1301 1302 static const struct cu_partial_die_info find_partial_die (sect_offset, int, 1303 struct dwarf2_cu *); 1304 1305 static const gdb_byte *read_attribute (const struct die_reader_specs *, 1306 struct attribute *, struct attr_abbrev *, 1307 const gdb_byte *, bool *need_reprocess); 1308 1309 static void read_attribute_reprocess (const struct die_reader_specs *reader, 1310 struct attribute *attr, dwarf_tag tag); 1311 1312 static CORE_ADDR read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index); 1313 1314 static sect_offset read_abbrev_offset (dwarf2_per_objfile *per_objfile, 1315 dwarf2_section_info *, sect_offset); 1316 1317 static const char *read_indirect_string 1318 (dwarf2_per_objfile *per_objfile, bfd *, const gdb_byte *, 1319 const struct comp_unit_head *, unsigned int *); 1320 1321 static const char *read_indirect_string_at_offset 1322 (dwarf2_per_objfile *per_objfile, LONGEST str_offset); 1323 1324 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *, 1325 const gdb_byte *, 1326 unsigned int *); 1327 1328 static const char *read_dwo_str_index (const struct die_reader_specs *reader, 1329 ULONGEST str_index); 1330 1331 static const char *read_stub_str_index (struct dwarf2_cu *cu, 1332 ULONGEST str_index); 1333 1334 static void set_cu_language (unsigned int, struct dwarf2_cu *); 1335 1336 static struct attribute *dwarf2_attr (struct die_info *, unsigned int, 1337 struct dwarf2_cu *); 1338 1339 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name, 1340 struct dwarf2_cu *cu); 1341 1342 static const char *dwarf2_dwo_name (struct die_info *die, struct dwarf2_cu *cu); 1343 1344 static int dwarf2_flag_true_p (struct die_info *die, unsigned name, 1345 struct dwarf2_cu *cu); 1346 1347 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu); 1348 1349 static struct die_info *die_specification (struct die_info *die, 1350 struct dwarf2_cu **); 1351 1352 static line_header_up dwarf_decode_line_header (sect_offset sect_off, 1353 struct dwarf2_cu *cu); 1354 1355 static void dwarf_decode_lines (struct line_header *, const char *, 1356 struct dwarf2_cu *, dwarf2_psymtab *, 1357 CORE_ADDR, int decode_mapping); 1358 1359 static void dwarf2_start_subfile (struct dwarf2_cu *, const char *, 1360 const char *); 1361 1362 static struct symbol *new_symbol (struct die_info *, struct type *, 1363 struct dwarf2_cu *, struct symbol * = NULL); 1364 1365 static void dwarf2_const_value (const struct attribute *, struct symbol *, 1366 struct dwarf2_cu *); 1367 1368 static void dwarf2_const_value_attr (const struct attribute *attr, 1369 struct type *type, 1370 const char *name, 1371 struct obstack *obstack, 1372 struct dwarf2_cu *cu, LONGEST *value, 1373 const gdb_byte **bytes, 1374 struct dwarf2_locexpr_baton **baton); 1375 1376 static struct type *die_type (struct die_info *, struct dwarf2_cu *); 1377 1378 static int need_gnat_info (struct dwarf2_cu *); 1379 1380 static struct type *die_descriptive_type (struct die_info *, 1381 struct dwarf2_cu *); 1382 1383 static void set_descriptive_type (struct type *, struct die_info *, 1384 struct dwarf2_cu *); 1385 1386 static struct type *die_containing_type (struct die_info *, 1387 struct dwarf2_cu *); 1388 1389 static struct type *lookup_die_type (struct die_info *, const struct attribute *, 1390 struct dwarf2_cu *); 1391 1392 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *); 1393 1394 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *); 1395 1396 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *); 1397 1398 static char *typename_concat (struct obstack *obs, const char *prefix, 1399 const char *suffix, int physname, 1400 struct dwarf2_cu *cu); 1401 1402 static void read_file_scope (struct die_info *, struct dwarf2_cu *); 1403 1404 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *); 1405 1406 static void read_func_scope (struct die_info *, struct dwarf2_cu *); 1407 1408 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *); 1409 1410 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu); 1411 1412 static void read_variable (struct die_info *die, struct dwarf2_cu *cu); 1413 1414 /* Return the .debug_loclists section to use for cu. */ 1415 static struct dwarf2_section_info *cu_debug_loc_section (struct dwarf2_cu *cu); 1416 1417 /* Return the .debug_rnglists section to use for cu. */ 1418 static struct dwarf2_section_info *cu_debug_rnglists_section 1419 (struct dwarf2_cu *cu, dwarf_tag tag); 1420 1421 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return 1422 values. Keep the items ordered with increasing constraints compliance. */ 1423 enum pc_bounds_kind 1424 { 1425 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */ 1426 PC_BOUNDS_NOT_PRESENT, 1427 1428 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges 1429 were present but they do not form a valid range of PC addresses. */ 1430 PC_BOUNDS_INVALID, 1431 1432 /* Discontiguous range was found - that is DW_AT_ranges was found. */ 1433 PC_BOUNDS_RANGES, 1434 1435 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */ 1436 PC_BOUNDS_HIGH_LOW, 1437 }; 1438 1439 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *, 1440 CORE_ADDR *, CORE_ADDR *, 1441 struct dwarf2_cu *, 1442 dwarf2_psymtab *); 1443 1444 static void get_scope_pc_bounds (struct die_info *, 1445 CORE_ADDR *, CORE_ADDR *, 1446 struct dwarf2_cu *); 1447 1448 static void dwarf2_record_block_ranges (struct die_info *, struct block *, 1449 CORE_ADDR, struct dwarf2_cu *); 1450 1451 static void dwarf2_add_field (struct field_info *, struct die_info *, 1452 struct dwarf2_cu *); 1453 1454 static void dwarf2_attach_fields_to_type (struct field_info *, 1455 struct type *, struct dwarf2_cu *); 1456 1457 static void dwarf2_add_member_fn (struct field_info *, 1458 struct die_info *, struct type *, 1459 struct dwarf2_cu *); 1460 1461 static void dwarf2_attach_fn_fields_to_type (struct field_info *, 1462 struct type *, 1463 struct dwarf2_cu *); 1464 1465 static void process_structure_scope (struct die_info *, struct dwarf2_cu *); 1466 1467 static void read_common_block (struct die_info *, struct dwarf2_cu *); 1468 1469 static void read_namespace (struct die_info *die, struct dwarf2_cu *); 1470 1471 static void read_module (struct die_info *die, struct dwarf2_cu *cu); 1472 1473 static struct using_direct **using_directives (struct dwarf2_cu *cu); 1474 1475 static void read_import_statement (struct die_info *die, struct dwarf2_cu *); 1476 1477 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu); 1478 1479 static struct type *read_module_type (struct die_info *die, 1480 struct dwarf2_cu *cu); 1481 1482 static const char *namespace_name (struct die_info *die, 1483 int *is_anonymous, struct dwarf2_cu *); 1484 1485 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *); 1486 1487 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *, 1488 bool * = nullptr); 1489 1490 static enum dwarf_array_dim_ordering read_array_order (struct die_info *, 1491 struct dwarf2_cu *); 1492 1493 static struct die_info *read_die_and_siblings_1 1494 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **, 1495 struct die_info *); 1496 1497 static struct die_info *read_die_and_siblings (const struct die_reader_specs *, 1498 const gdb_byte *info_ptr, 1499 const gdb_byte **new_info_ptr, 1500 struct die_info *parent); 1501 1502 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *, 1503 struct die_info **, const gdb_byte *, 1504 int); 1505 1506 static const gdb_byte *read_full_die (const struct die_reader_specs *, 1507 struct die_info **, const gdb_byte *); 1508 1509 static void process_die (struct die_info *, struct dwarf2_cu *); 1510 1511 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *, 1512 struct objfile *); 1513 1514 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *); 1515 1516 static const char *dwarf2_full_name (const char *name, 1517 struct die_info *die, 1518 struct dwarf2_cu *cu); 1519 1520 static const char *dwarf2_physname (const char *name, struct die_info *die, 1521 struct dwarf2_cu *cu); 1522 1523 static struct die_info *dwarf2_extension (struct die_info *die, 1524 struct dwarf2_cu **); 1525 1526 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *); 1527 1528 static void dump_die_for_error (struct die_info *); 1529 1530 static void dump_die_1 (struct ui_file *, int level, int max_level, 1531 struct die_info *); 1532 1533 /*static*/ void dump_die (struct die_info *, int max_level); 1534 1535 static void store_in_ref_table (struct die_info *, 1536 struct dwarf2_cu *); 1537 1538 static struct die_info *follow_die_ref_or_sig (struct die_info *, 1539 const struct attribute *, 1540 struct dwarf2_cu **); 1541 1542 static struct die_info *follow_die_ref (struct die_info *, 1543 const struct attribute *, 1544 struct dwarf2_cu **); 1545 1546 static struct die_info *follow_die_sig (struct die_info *, 1547 const struct attribute *, 1548 struct dwarf2_cu **); 1549 1550 static struct type *get_signatured_type (struct die_info *, ULONGEST, 1551 struct dwarf2_cu *); 1552 1553 static struct type *get_DW_AT_signature_type (struct die_info *, 1554 const struct attribute *, 1555 struct dwarf2_cu *); 1556 1557 static void load_full_type_unit (dwarf2_per_cu_data *per_cu, 1558 dwarf2_per_objfile *per_objfile); 1559 1560 static void read_signatured_type (signatured_type *sig_type, 1561 dwarf2_per_objfile *per_objfile); 1562 1563 static int attr_to_dynamic_prop (const struct attribute *attr, 1564 struct die_info *die, struct dwarf2_cu *cu, 1565 struct dynamic_prop *prop, struct type *type); 1566 1567 /* memory allocation interface */ 1568 1569 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *); 1570 1571 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int); 1572 1573 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int); 1574 1575 static void fill_in_loclist_baton (struct dwarf2_cu *cu, 1576 struct dwarf2_loclist_baton *baton, 1577 const struct attribute *attr); 1578 1579 static void dwarf2_symbol_mark_computed (const struct attribute *attr, 1580 struct symbol *sym, 1581 struct dwarf2_cu *cu, 1582 int is_block); 1583 1584 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader, 1585 const gdb_byte *info_ptr, 1586 struct abbrev_info *abbrev); 1587 1588 static hashval_t partial_die_hash (const void *item); 1589 1590 static int partial_die_eq (const void *item_lhs, const void *item_rhs); 1591 1592 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit 1593 (sect_offset sect_off, unsigned int offset_in_dwz, 1594 dwarf2_per_objfile *per_objfile); 1595 1596 static void prepare_one_comp_unit (struct dwarf2_cu *cu, 1597 struct die_info *comp_unit_die, 1598 enum language pretend_language); 1599 1600 static struct type *set_die_type (struct die_info *, struct type *, 1601 struct dwarf2_cu *); 1602 1603 static void create_all_comp_units (dwarf2_per_objfile *per_objfile); 1604 1605 static int create_all_type_units (dwarf2_per_objfile *per_objfile); 1606 1607 static void load_full_comp_unit (dwarf2_per_cu_data *per_cu, 1608 dwarf2_per_objfile *per_objfile, 1609 bool skip_partial, 1610 enum language pretend_language); 1611 1612 static void process_full_comp_unit (dwarf2_cu *cu, 1613 enum language pretend_language); 1614 1615 static void process_full_type_unit (dwarf2_cu *cu, 1616 enum language pretend_language); 1617 1618 static void dwarf2_add_dependence (struct dwarf2_cu *, 1619 struct dwarf2_per_cu_data *); 1620 1621 static void dwarf2_mark (struct dwarf2_cu *); 1622 1623 static struct type *get_die_type_at_offset (sect_offset, 1624 dwarf2_per_cu_data *per_cu, 1625 dwarf2_per_objfile *per_objfile); 1626 1627 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu); 1628 1629 static void queue_comp_unit (dwarf2_per_cu_data *per_cu, 1630 dwarf2_per_objfile *per_objfile, 1631 enum language pretend_language); 1632 1633 static void process_queue (dwarf2_per_objfile *per_objfile); 1634 1635 /* Class, the destructor of which frees all allocated queue entries. This 1636 will only have work to do if an error was thrown while processing the 1637 dwarf. If no error was thrown then the queue entries should have all 1638 been processed, and freed, as we went along. */ 1639 1640 class dwarf2_queue_guard 1641 { 1642 public: 1643 explicit dwarf2_queue_guard (dwarf2_per_objfile *per_objfile) 1644 : m_per_objfile (per_objfile) 1645 { 1646 } 1647 1648 /* Free any entries remaining on the queue. There should only be 1649 entries left if we hit an error while processing the dwarf. */ 1650 ~dwarf2_queue_guard () 1651 { 1652 /* Ensure that no memory is allocated by the queue. */ 1653 std::queue<dwarf2_queue_item> empty; 1654 std::swap (m_per_objfile->per_bfd->queue, empty); 1655 } 1656 1657 DISABLE_COPY_AND_ASSIGN (dwarf2_queue_guard); 1658 1659 private: 1660 dwarf2_per_objfile *m_per_objfile; 1661 }; 1662 1663 dwarf2_queue_item::~dwarf2_queue_item () 1664 { 1665 /* Anything still marked queued is likely to be in an 1666 inconsistent state, so discard it. */ 1667 if (per_cu->queued) 1668 { 1669 per_objfile->remove_cu (per_cu); 1670 per_cu->queued = 0; 1671 } 1672 } 1673 1674 /* The return type of find_file_and_directory. Note, the enclosed 1675 string pointers are only valid while this object is valid. */ 1676 1677 struct file_and_directory 1678 { 1679 /* The filename. This is never NULL. */ 1680 const char *name; 1681 1682 /* The compilation directory. NULL if not known. If we needed to 1683 compute a new string, this points to COMP_DIR_STORAGE, otherwise, 1684 points directly to the DW_AT_comp_dir string attribute owned by 1685 the obstack that owns the DIE. */ 1686 const char *comp_dir; 1687 1688 /* If we needed to build a new string for comp_dir, this is what 1689 owns the storage. */ 1690 std::string comp_dir_storage; 1691 }; 1692 1693 static file_and_directory find_file_and_directory (struct die_info *die, 1694 struct dwarf2_cu *cu); 1695 1696 static htab_up allocate_signatured_type_table (); 1697 1698 static htab_up allocate_dwo_unit_table (); 1699 1700 static struct dwo_unit *lookup_dwo_unit_in_dwp 1701 (dwarf2_per_objfile *per_objfile, struct dwp_file *dwp_file, 1702 const char *comp_dir, ULONGEST signature, int is_debug_types); 1703 1704 static struct dwp_file *get_dwp_file (dwarf2_per_objfile *per_objfile); 1705 1706 static struct dwo_unit *lookup_dwo_comp_unit 1707 (dwarf2_cu *cu, const char *dwo_name, const char *comp_dir, 1708 ULONGEST signature); 1709 1710 static struct dwo_unit *lookup_dwo_type_unit 1711 (dwarf2_cu *cu, const char *dwo_name, const char *comp_dir); 1712 1713 static void queue_and_load_all_dwo_tus (dwarf2_cu *cu); 1714 1715 /* A unique pointer to a dwo_file. */ 1716 1717 typedef std::unique_ptr<struct dwo_file> dwo_file_up; 1718 1719 static void process_cu_includes (dwarf2_per_objfile *per_objfile); 1720 1721 static void check_producer (struct dwarf2_cu *cu); 1722 1723 static void free_line_header_voidp (void *arg); 1724 1725 /* Various complaints about symbol reading that don't abort the process. */ 1726 1727 static void 1728 dwarf2_debug_line_missing_file_complaint (void) 1729 { 1730 complaint (_(".debug_line section has line data without a file")); 1731 } 1732 1733 static void 1734 dwarf2_debug_line_missing_end_sequence_complaint (void) 1735 { 1736 complaint (_(".debug_line section has line " 1737 "program sequence without an end")); 1738 } 1739 1740 static void 1741 dwarf2_complex_location_expr_complaint (void) 1742 { 1743 complaint (_("location expression too complex")); 1744 } 1745 1746 static void 1747 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2, 1748 int arg3) 1749 { 1750 complaint (_("const value length mismatch for '%s', got %d, expected %d"), 1751 arg1, arg2, arg3); 1752 } 1753 1754 static void 1755 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2) 1756 { 1757 complaint (_("invalid attribute class or form for '%s' in '%s'"), 1758 arg1, arg2); 1759 } 1760 1761 /* Hash function for line_header_hash. */ 1762 1763 static hashval_t 1764 line_header_hash (const struct line_header *ofs) 1765 { 1766 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz; 1767 } 1768 1769 /* Hash function for htab_create_alloc_ex for line_header_hash. */ 1770 1771 static hashval_t 1772 line_header_hash_voidp (const void *item) 1773 { 1774 const struct line_header *ofs = (const struct line_header *) item; 1775 1776 return line_header_hash (ofs); 1777 } 1778 1779 /* Equality function for line_header_hash. */ 1780 1781 static int 1782 line_header_eq_voidp (const void *item_lhs, const void *item_rhs) 1783 { 1784 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs; 1785 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs; 1786 1787 return (ofs_lhs->sect_off == ofs_rhs->sect_off 1788 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz); 1789 } 1790 1791 1792 1793 /* See declaration. */ 1794 1795 dwarf2_per_bfd::dwarf2_per_bfd (bfd *obfd, const dwarf2_debug_sections *names, 1796 bool can_copy_) 1797 : obfd (obfd), 1798 can_copy (can_copy_) 1799 { 1800 if (names == NULL) 1801 names = &dwarf2_elf_names; 1802 1803 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next) 1804 locate_sections (obfd, sec, *names); 1805 } 1806 1807 dwarf2_per_bfd::~dwarf2_per_bfd () 1808 { 1809 for (dwarf2_per_cu_data *per_cu : all_comp_units) 1810 per_cu->imported_symtabs_free (); 1811 1812 for (signatured_type *sig_type : all_type_units) 1813 sig_type->per_cu.imported_symtabs_free (); 1814 1815 /* Everything else should be on this->obstack. */ 1816 } 1817 1818 /* See read.h. */ 1819 1820 void 1821 dwarf2_per_objfile::remove_all_cus () 1822 { 1823 for (auto pair : m_dwarf2_cus) 1824 delete pair.second; 1825 1826 m_dwarf2_cus.clear (); 1827 } 1828 1829 /* A helper class that calls free_cached_comp_units on 1830 destruction. */ 1831 1832 class free_cached_comp_units 1833 { 1834 public: 1835 1836 explicit free_cached_comp_units (dwarf2_per_objfile *per_objfile) 1837 : m_per_objfile (per_objfile) 1838 { 1839 } 1840 1841 ~free_cached_comp_units () 1842 { 1843 m_per_objfile->remove_all_cus (); 1844 } 1845 1846 DISABLE_COPY_AND_ASSIGN (free_cached_comp_units); 1847 1848 private: 1849 1850 dwarf2_per_objfile *m_per_objfile; 1851 }; 1852 1853 /* See read.h. */ 1854 1855 bool 1856 dwarf2_per_objfile::symtab_set_p (const dwarf2_per_cu_data *per_cu) const 1857 { 1858 gdb_assert (per_cu->index < this->m_symtabs.size ()); 1859 1860 return this->m_symtabs[per_cu->index] != nullptr; 1861 } 1862 1863 /* See read.h. */ 1864 1865 compunit_symtab * 1866 dwarf2_per_objfile::get_symtab (const dwarf2_per_cu_data *per_cu) const 1867 { 1868 gdb_assert (per_cu->index < this->m_symtabs.size ()); 1869 1870 return this->m_symtabs[per_cu->index]; 1871 } 1872 1873 /* See read.h. */ 1874 1875 void 1876 dwarf2_per_objfile::set_symtab (const dwarf2_per_cu_data *per_cu, 1877 compunit_symtab *symtab) 1878 { 1879 gdb_assert (per_cu->index < this->m_symtabs.size ()); 1880 gdb_assert (this->m_symtabs[per_cu->index] == nullptr); 1881 1882 this->m_symtabs[per_cu->index] = symtab; 1883 } 1884 1885 /* Try to locate the sections we need for DWARF 2 debugging 1886 information and return true if we have enough to do something. 1887 NAMES points to the dwarf2 section names, or is NULL if the standard 1888 ELF names are used. CAN_COPY is true for formats where symbol 1889 interposition is possible and so symbol values must follow copy 1890 relocation rules. */ 1891 1892 int 1893 dwarf2_has_info (struct objfile *objfile, 1894 const struct dwarf2_debug_sections *names, 1895 bool can_copy) 1896 { 1897 if (objfile->flags & OBJF_READNEVER) 1898 return 0; 1899 1900 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 1901 1902 if (per_objfile == NULL) 1903 { 1904 dwarf2_per_bfd *per_bfd; 1905 1906 /* We can share a "dwarf2_per_bfd" with other objfiles if the BFD 1907 doesn't require relocations and if there aren't partial symbols 1908 from some other reader. */ 1909 if (!objfile_has_partial_symbols (objfile) 1910 && !gdb_bfd_requires_relocations (objfile->obfd)) 1911 { 1912 /* See if one has been created for this BFD yet. */ 1913 per_bfd = dwarf2_per_bfd_bfd_data_key.get (objfile->obfd); 1914 1915 if (per_bfd == nullptr) 1916 { 1917 /* No, create it now. */ 1918 per_bfd = new dwarf2_per_bfd (objfile->obfd, names, can_copy); 1919 dwarf2_per_bfd_bfd_data_key.set (objfile->obfd, per_bfd); 1920 } 1921 } 1922 else 1923 { 1924 /* No sharing possible, create one specifically for this objfile. */ 1925 per_bfd = new dwarf2_per_bfd (objfile->obfd, names, can_copy); 1926 dwarf2_per_bfd_objfile_data_key.set (objfile, per_bfd); 1927 } 1928 1929 per_objfile = dwarf2_objfile_data_key.emplace (objfile, objfile, per_bfd); 1930 } 1931 1932 return (!per_objfile->per_bfd->info.is_virtual 1933 && per_objfile->per_bfd->info.s.section != NULL 1934 && !per_objfile->per_bfd->abbrev.is_virtual 1935 && per_objfile->per_bfd->abbrev.s.section != NULL); 1936 } 1937 1938 /* When loading sections, we look either for uncompressed section or for 1939 compressed section names. */ 1940 1941 static int 1942 section_is_p (const char *section_name, 1943 const struct dwarf2_section_names *names) 1944 { 1945 if (names->normal != NULL 1946 && strcmp (section_name, names->normal) == 0) 1947 return 1; 1948 if (names->compressed != NULL 1949 && strcmp (section_name, names->compressed) == 0) 1950 return 1; 1951 return 0; 1952 } 1953 1954 /* See declaration. */ 1955 1956 void 1957 dwarf2_per_bfd::locate_sections (bfd *abfd, asection *sectp, 1958 const dwarf2_debug_sections &names) 1959 { 1960 flagword aflag = bfd_section_flags (sectp); 1961 1962 if ((aflag & SEC_HAS_CONTENTS) == 0) 1963 { 1964 } 1965 else if (elf_section_data (sectp)->this_hdr.sh_size 1966 > bfd_get_file_size (abfd)) 1967 { 1968 bfd_size_type size = elf_section_data (sectp)->this_hdr.sh_size; 1969 warning (_("Discarding section %s which has a section size (%s" 1970 ") larger than the file size [in module %s]"), 1971 bfd_section_name (sectp), phex_nz (size, sizeof (size)), 1972 bfd_get_filename (abfd)); 1973 } 1974 else if (section_is_p (sectp->name, &names.info)) 1975 { 1976 this->info.s.section = sectp; 1977 this->info.size = bfd_section_size (sectp); 1978 } 1979 else if (section_is_p (sectp->name, &names.abbrev)) 1980 { 1981 this->abbrev.s.section = sectp; 1982 this->abbrev.size = bfd_section_size (sectp); 1983 } 1984 else if (section_is_p (sectp->name, &names.line)) 1985 { 1986 this->line.s.section = sectp; 1987 this->line.size = bfd_section_size (sectp); 1988 } 1989 else if (section_is_p (sectp->name, &names.loc)) 1990 { 1991 this->loc.s.section = sectp; 1992 this->loc.size = bfd_section_size (sectp); 1993 } 1994 else if (section_is_p (sectp->name, &names.loclists)) 1995 { 1996 this->loclists.s.section = sectp; 1997 this->loclists.size = bfd_section_size (sectp); 1998 } 1999 else if (section_is_p (sectp->name, &names.macinfo)) 2000 { 2001 this->macinfo.s.section = sectp; 2002 this->macinfo.size = bfd_section_size (sectp); 2003 } 2004 else if (section_is_p (sectp->name, &names.macro)) 2005 { 2006 this->macro.s.section = sectp; 2007 this->macro.size = bfd_section_size (sectp); 2008 } 2009 else if (section_is_p (sectp->name, &names.str)) 2010 { 2011 this->str.s.section = sectp; 2012 this->str.size = bfd_section_size (sectp); 2013 } 2014 else if (section_is_p (sectp->name, &names.str_offsets)) 2015 { 2016 this->str_offsets.s.section = sectp; 2017 this->str_offsets.size = bfd_section_size (sectp); 2018 } 2019 else if (section_is_p (sectp->name, &names.line_str)) 2020 { 2021 this->line_str.s.section = sectp; 2022 this->line_str.size = bfd_section_size (sectp); 2023 } 2024 else if (section_is_p (sectp->name, &names.addr)) 2025 { 2026 this->addr.s.section = sectp; 2027 this->addr.size = bfd_section_size (sectp); 2028 } 2029 else if (section_is_p (sectp->name, &names.frame)) 2030 { 2031 this->frame.s.section = sectp; 2032 this->frame.size = bfd_section_size (sectp); 2033 } 2034 else if (section_is_p (sectp->name, &names.eh_frame)) 2035 { 2036 this->eh_frame.s.section = sectp; 2037 this->eh_frame.size = bfd_section_size (sectp); 2038 } 2039 else if (section_is_p (sectp->name, &names.ranges)) 2040 { 2041 this->ranges.s.section = sectp; 2042 this->ranges.size = bfd_section_size (sectp); 2043 } 2044 else if (section_is_p (sectp->name, &names.rnglists)) 2045 { 2046 this->rnglists.s.section = sectp; 2047 this->rnglists.size = bfd_section_size (sectp); 2048 } 2049 else if (section_is_p (sectp->name, &names.types)) 2050 { 2051 struct dwarf2_section_info type_section; 2052 2053 memset (&type_section, 0, sizeof (type_section)); 2054 type_section.s.section = sectp; 2055 type_section.size = bfd_section_size (sectp); 2056 2057 this->types.push_back (type_section); 2058 } 2059 else if (section_is_p (sectp->name, &names.gdb_index)) 2060 { 2061 this->gdb_index.s.section = sectp; 2062 this->gdb_index.size = bfd_section_size (sectp); 2063 } 2064 else if (section_is_p (sectp->name, &names.debug_names)) 2065 { 2066 this->debug_names.s.section = sectp; 2067 this->debug_names.size = bfd_section_size (sectp); 2068 } 2069 else if (section_is_p (sectp->name, &names.debug_aranges)) 2070 { 2071 this->debug_aranges.s.section = sectp; 2072 this->debug_aranges.size = bfd_section_size (sectp); 2073 } 2074 2075 if ((bfd_section_flags (sectp) & (SEC_LOAD | SEC_ALLOC)) 2076 && bfd_section_vma (sectp) == 0) 2077 this->has_section_at_zero = true; 2078 } 2079 2080 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and 2081 SECTION_NAME. */ 2082 2083 void 2084 dwarf2_get_section_info (struct objfile *objfile, 2085 enum dwarf2_section_enum sect, 2086 asection **sectp, const gdb_byte **bufp, 2087 bfd_size_type *sizep) 2088 { 2089 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 2090 struct dwarf2_section_info *info; 2091 2092 /* We may see an objfile without any DWARF, in which case we just 2093 return nothing. */ 2094 if (per_objfile == NULL) 2095 { 2096 *sectp = NULL; 2097 *bufp = NULL; 2098 *sizep = 0; 2099 return; 2100 } 2101 switch (sect) 2102 { 2103 case DWARF2_DEBUG_FRAME: 2104 info = &per_objfile->per_bfd->frame; 2105 break; 2106 case DWARF2_EH_FRAME: 2107 info = &per_objfile->per_bfd->eh_frame; 2108 break; 2109 default: 2110 gdb_assert_not_reached ("unexpected section"); 2111 } 2112 2113 info->read (objfile); 2114 2115 *sectp = info->get_bfd_section (); 2116 *bufp = info->buffer; 2117 *sizep = info->size; 2118 } 2119 2120 /* A helper function to find the sections for a .dwz file. */ 2121 2122 static void 2123 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg) 2124 { 2125 struct dwz_file *dwz_file = (struct dwz_file *) arg; 2126 2127 /* Note that we only support the standard ELF names, because .dwz 2128 is ELF-only (at the time of writing). */ 2129 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev)) 2130 { 2131 dwz_file->abbrev.s.section = sectp; 2132 dwz_file->abbrev.size = bfd_section_size (sectp); 2133 } 2134 else if (section_is_p (sectp->name, &dwarf2_elf_names.info)) 2135 { 2136 dwz_file->info.s.section = sectp; 2137 dwz_file->info.size = bfd_section_size (sectp); 2138 } 2139 else if (section_is_p (sectp->name, &dwarf2_elf_names.str)) 2140 { 2141 dwz_file->str.s.section = sectp; 2142 dwz_file->str.size = bfd_section_size (sectp); 2143 } 2144 else if (section_is_p (sectp->name, &dwarf2_elf_names.line)) 2145 { 2146 dwz_file->line.s.section = sectp; 2147 dwz_file->line.size = bfd_section_size (sectp); 2148 } 2149 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro)) 2150 { 2151 dwz_file->macro.s.section = sectp; 2152 dwz_file->macro.size = bfd_section_size (sectp); 2153 } 2154 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index)) 2155 { 2156 dwz_file->gdb_index.s.section = sectp; 2157 dwz_file->gdb_index.size = bfd_section_size (sectp); 2158 } 2159 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names)) 2160 { 2161 dwz_file->debug_names.s.section = sectp; 2162 dwz_file->debug_names.size = bfd_section_size (sectp); 2163 } 2164 } 2165 2166 /* See dwarf2read.h. */ 2167 2168 struct dwz_file * 2169 dwarf2_get_dwz_file (dwarf2_per_bfd *per_bfd) 2170 { 2171 const char *filename; 2172 bfd_size_type buildid_len_arg; 2173 size_t buildid_len; 2174 bfd_byte *buildid; 2175 2176 if (per_bfd->dwz_file != NULL) 2177 return per_bfd->dwz_file.get (); 2178 2179 bfd_set_error (bfd_error_no_error); 2180 gdb::unique_xmalloc_ptr<char> data 2181 (bfd_get_alt_debug_link_info (per_bfd->obfd, 2182 &buildid_len_arg, &buildid)); 2183 if (data == NULL) 2184 { 2185 if (bfd_get_error () == bfd_error_no_error) 2186 return NULL; 2187 error (_("could not read '.gnu_debugaltlink' section: %s"), 2188 bfd_errmsg (bfd_get_error ())); 2189 } 2190 2191 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid); 2192 2193 buildid_len = (size_t) buildid_len_arg; 2194 2195 filename = data.get (); 2196 2197 std::string abs_storage; 2198 if (!IS_ABSOLUTE_PATH (filename)) 2199 { 2200 gdb::unique_xmalloc_ptr<char> abs 2201 = gdb_realpath (bfd_get_filename (per_bfd->obfd)); 2202 2203 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename; 2204 filename = abs_storage.c_str (); 2205 } 2206 2207 /* First try the file name given in the section. If that doesn't 2208 work, try to use the build-id instead. */ 2209 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget)); 2210 if (dwz_bfd != NULL) 2211 { 2212 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid)) 2213 dwz_bfd.reset (nullptr); 2214 } 2215 2216 if (dwz_bfd == NULL) 2217 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid); 2218 2219 if (dwz_bfd == nullptr) 2220 { 2221 gdb::unique_xmalloc_ptr<char> alt_filename; 2222 const char *origname = bfd_get_filename (per_bfd->obfd); 2223 2224 scoped_fd fd (debuginfod_debuginfo_query (buildid, 2225 buildid_len, 2226 origname, 2227 &alt_filename)); 2228 2229 if (fd.get () >= 0) 2230 { 2231 /* File successfully retrieved from server. */ 2232 dwz_bfd = gdb_bfd_open (alt_filename.get (), gnutarget); 2233 2234 if (dwz_bfd == nullptr) 2235 warning (_("File \"%s\" from debuginfod cannot be opened as bfd"), 2236 alt_filename.get ()); 2237 else if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid)) 2238 dwz_bfd.reset (nullptr); 2239 } 2240 } 2241 2242 if (dwz_bfd == NULL) 2243 error (_("could not find '.gnu_debugaltlink' file for %s"), 2244 bfd_get_filename (per_bfd->obfd)); 2245 2246 std::unique_ptr<struct dwz_file> result 2247 (new struct dwz_file (std::move (dwz_bfd))); 2248 2249 bfd_map_over_sections (result->dwz_bfd.get (), locate_dwz_sections, 2250 result.get ()); 2251 2252 gdb_bfd_record_inclusion (per_bfd->obfd, result->dwz_bfd.get ()); 2253 per_bfd->dwz_file = std::move (result); 2254 return per_bfd->dwz_file.get (); 2255 } 2256 2257 /* DWARF quick_symbols_functions support. */ 2258 2259 /* TUs can share .debug_line entries, and there can be a lot more TUs than 2260 unique line tables, so we maintain a separate table of all .debug_line 2261 derived entries to support the sharing. 2262 All the quick functions need is the list of file names. We discard the 2263 line_header when we're done and don't need to record it here. */ 2264 struct quick_file_names 2265 { 2266 /* The data used to construct the hash key. */ 2267 struct stmt_list_hash hash; 2268 2269 /* The number of entries in file_names, real_names. */ 2270 unsigned int num_file_names; 2271 2272 /* The file names from the line table, after being run through 2273 file_full_name. */ 2274 const char **file_names; 2275 2276 /* The file names from the line table after being run through 2277 gdb_realpath. These are computed lazily. */ 2278 const char **real_names; 2279 }; 2280 2281 /* When using the index (and thus not using psymtabs), each CU has an 2282 object of this type. This is used to hold information needed by 2283 the various "quick" methods. */ 2284 struct dwarf2_per_cu_quick_data 2285 { 2286 /* The file table. This can be NULL if there was no file table 2287 or it's currently not read in. 2288 NOTE: This points into dwarf2_per_objfile->per_bfd->quick_file_names_table. */ 2289 struct quick_file_names *file_names; 2290 2291 /* A temporary mark bit used when iterating over all CUs in 2292 expand_symtabs_matching. */ 2293 unsigned int mark : 1; 2294 2295 /* True if we've tried to read the file table and found there isn't one. 2296 There will be no point in trying to read it again next time. */ 2297 unsigned int no_file_data : 1; 2298 }; 2299 2300 /* Utility hash function for a stmt_list_hash. */ 2301 2302 static hashval_t 2303 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash) 2304 { 2305 hashval_t v = 0; 2306 2307 if (stmt_list_hash->dwo_unit != NULL) 2308 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file; 2309 v += to_underlying (stmt_list_hash->line_sect_off); 2310 return v; 2311 } 2312 2313 /* Utility equality function for a stmt_list_hash. */ 2314 2315 static int 2316 eq_stmt_list_entry (const struct stmt_list_hash *lhs, 2317 const struct stmt_list_hash *rhs) 2318 { 2319 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL)) 2320 return 0; 2321 if (lhs->dwo_unit != NULL 2322 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file) 2323 return 0; 2324 2325 return lhs->line_sect_off == rhs->line_sect_off; 2326 } 2327 2328 /* Hash function for a quick_file_names. */ 2329 2330 static hashval_t 2331 hash_file_name_entry (const void *e) 2332 { 2333 const struct quick_file_names *file_data 2334 = (const struct quick_file_names *) e; 2335 2336 return hash_stmt_list_entry (&file_data->hash); 2337 } 2338 2339 /* Equality function for a quick_file_names. */ 2340 2341 static int 2342 eq_file_name_entry (const void *a, const void *b) 2343 { 2344 const struct quick_file_names *ea = (const struct quick_file_names *) a; 2345 const struct quick_file_names *eb = (const struct quick_file_names *) b; 2346 2347 return eq_stmt_list_entry (&ea->hash, &eb->hash); 2348 } 2349 2350 /* Delete function for a quick_file_names. */ 2351 2352 static void 2353 delete_file_name_entry (void *e) 2354 { 2355 struct quick_file_names *file_data = (struct quick_file_names *) e; 2356 int i; 2357 2358 for (i = 0; i < file_data->num_file_names; ++i) 2359 { 2360 xfree ((void*) file_data->file_names[i]); 2361 if (file_data->real_names) 2362 xfree ((void*) file_data->real_names[i]); 2363 } 2364 2365 /* The space for the struct itself lives on the obstack, so we don't 2366 free it here. */ 2367 } 2368 2369 /* Create a quick_file_names hash table. */ 2370 2371 static htab_up 2372 create_quick_file_names_table (unsigned int nr_initial_entries) 2373 { 2374 return htab_up (htab_create_alloc (nr_initial_entries, 2375 hash_file_name_entry, eq_file_name_entry, 2376 delete_file_name_entry, xcalloc, xfree)); 2377 } 2378 2379 /* Read in CU (dwarf2_cu object) for PER_CU in the context of PER_OBJFILE. This 2380 function is unrelated to symtabs, symtab would have to be created afterwards. 2381 You should call age_cached_comp_units after processing the CU. */ 2382 2383 static dwarf2_cu * 2384 load_cu (dwarf2_per_cu_data *per_cu, dwarf2_per_objfile *per_objfile, 2385 bool skip_partial) 2386 { 2387 if (per_cu->is_debug_types) 2388 load_full_type_unit (per_cu, per_objfile); 2389 else 2390 load_full_comp_unit (per_cu, per_objfile, skip_partial, language_minimal); 2391 2392 dwarf2_cu *cu = per_objfile->get_cu (per_cu); 2393 if (cu == nullptr) 2394 return nullptr; /* Dummy CU. */ 2395 2396 dwarf2_find_base_address (cu->dies, cu); 2397 2398 return cu; 2399 } 2400 2401 /* Read in the symbols for PER_CU in the context of DWARF"_PER_OBJFILE. */ 2402 2403 static void 2404 dw2_do_instantiate_symtab (dwarf2_per_cu_data *per_cu, 2405 dwarf2_per_objfile *per_objfile, bool skip_partial) 2406 { 2407 /* Skip type_unit_groups, reading the type units they contain 2408 is handled elsewhere. */ 2409 if (per_cu->type_unit_group_p ()) 2410 return; 2411 2412 /* The destructor of dwarf2_queue_guard frees any entries left on 2413 the queue. After this point we're guaranteed to leave this function 2414 with the dwarf queue empty. */ 2415 dwarf2_queue_guard q_guard (dwarf2_per_objfile); 2416 2417 if (!per_objfile->symtab_set_p (per_cu)) 2418 { 2419 queue_comp_unit (per_cu, per_objfile, language_minimal); 2420 dwarf2_cu *cu = load_cu (per_cu, per_objfile, skip_partial); 2421 2422 /* If we just loaded a CU from a DWO, and we're working with an index 2423 that may badly handle TUs, load all the TUs in that DWO as well. 2424 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */ 2425 if (!per_cu->is_debug_types 2426 && cu != NULL 2427 && cu->dwo_unit != NULL 2428 && per_objfile->per_bfd->index_table != NULL 2429 && per_objfile->per_bfd->index_table->version <= 7 2430 /* DWP files aren't supported yet. */ 2431 && get_dwp_file (per_objfile) == NULL) 2432 queue_and_load_all_dwo_tus (cu); 2433 } 2434 2435 process_queue (per_objfile); 2436 2437 /* Age the cache, releasing compilation units that have not 2438 been used recently. */ 2439 per_objfile->age_comp_units (); 2440 } 2441 2442 /* Ensure that the symbols for PER_CU have been read in. DWARF2_PER_OBJFILE is 2443 the per-objfile for which this symtab is instantiated. 2444 2445 Returns the resulting symbol table. */ 2446 2447 static struct compunit_symtab * 2448 dw2_instantiate_symtab (dwarf2_per_cu_data *per_cu, 2449 dwarf2_per_objfile *per_objfile, 2450 bool skip_partial) 2451 { 2452 gdb_assert (per_objfile->per_bfd->using_index); 2453 2454 if (!per_objfile->symtab_set_p (per_cu)) 2455 { 2456 free_cached_comp_units freer (per_objfile); 2457 scoped_restore decrementer = increment_reading_symtab (); 2458 dw2_do_instantiate_symtab (per_cu, per_objfile, skip_partial); 2459 process_cu_includes (per_objfile); 2460 } 2461 2462 return per_objfile->get_symtab (per_cu); 2463 } 2464 2465 /* See declaration. */ 2466 2467 dwarf2_per_cu_data * 2468 dwarf2_per_bfd::get_cutu (int index) 2469 { 2470 if (index >= this->all_comp_units.size ()) 2471 { 2472 index -= this->all_comp_units.size (); 2473 gdb_assert (index < this->all_type_units.size ()); 2474 return &this->all_type_units[index]->per_cu; 2475 } 2476 2477 return this->all_comp_units[index]; 2478 } 2479 2480 /* See declaration. */ 2481 2482 dwarf2_per_cu_data * 2483 dwarf2_per_bfd::get_cu (int index) 2484 { 2485 gdb_assert (index >= 0 && index < this->all_comp_units.size ()); 2486 2487 return this->all_comp_units[index]; 2488 } 2489 2490 /* See declaration. */ 2491 2492 signatured_type * 2493 dwarf2_per_bfd::get_tu (int index) 2494 { 2495 gdb_assert (index >= 0 && index < this->all_type_units.size ()); 2496 2497 return this->all_type_units[index]; 2498 } 2499 2500 /* See read.h. */ 2501 2502 dwarf2_per_cu_data * 2503 dwarf2_per_bfd::allocate_per_cu () 2504 { 2505 dwarf2_per_cu_data *result = OBSTACK_ZALLOC (&obstack, dwarf2_per_cu_data); 2506 result->per_bfd = this; 2507 result->index = m_num_psymtabs++; 2508 return result; 2509 } 2510 2511 /* See read.h. */ 2512 2513 signatured_type * 2514 dwarf2_per_bfd::allocate_signatured_type () 2515 { 2516 signatured_type *result = OBSTACK_ZALLOC (&obstack, signatured_type); 2517 result->per_cu.per_bfd = this; 2518 result->per_cu.index = m_num_psymtabs++; 2519 return result; 2520 } 2521 2522 /* Return a new dwarf2_per_cu_data allocated on the per-bfd 2523 obstack, and constructed with the specified field values. */ 2524 2525 static dwarf2_per_cu_data * 2526 create_cu_from_index_list (dwarf2_per_bfd *per_bfd, 2527 struct dwarf2_section_info *section, 2528 int is_dwz, 2529 sect_offset sect_off, ULONGEST length) 2530 { 2531 dwarf2_per_cu_data *the_cu = per_bfd->allocate_per_cu (); 2532 the_cu->sect_off = sect_off; 2533 the_cu->length = length; 2534 the_cu->section = section; 2535 the_cu->v.quick = OBSTACK_ZALLOC (&per_bfd->obstack, 2536 struct dwarf2_per_cu_quick_data); 2537 the_cu->is_dwz = is_dwz; 2538 return the_cu; 2539 } 2540 2541 /* A helper for create_cus_from_index that handles a given list of 2542 CUs. */ 2543 2544 static void 2545 create_cus_from_index_list (dwarf2_per_bfd *per_bfd, 2546 const gdb_byte *cu_list, offset_type n_elements, 2547 struct dwarf2_section_info *section, 2548 int is_dwz) 2549 { 2550 for (offset_type i = 0; i < n_elements; i += 2) 2551 { 2552 gdb_static_assert (sizeof (ULONGEST) >= 8); 2553 2554 sect_offset sect_off 2555 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE); 2556 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE); 2557 cu_list += 2 * 8; 2558 2559 dwarf2_per_cu_data *per_cu 2560 = create_cu_from_index_list (per_bfd, section, is_dwz, sect_off, 2561 length); 2562 per_bfd->all_comp_units.push_back (per_cu); 2563 } 2564 } 2565 2566 /* Read the CU list from the mapped index, and use it to create all 2567 the CU objects for PER_BFD. */ 2568 2569 static void 2570 create_cus_from_index (dwarf2_per_bfd *per_bfd, 2571 const gdb_byte *cu_list, offset_type cu_list_elements, 2572 const gdb_byte *dwz_list, offset_type dwz_elements) 2573 { 2574 gdb_assert (per_bfd->all_comp_units.empty ()); 2575 per_bfd->all_comp_units.reserve ((cu_list_elements + dwz_elements) / 2); 2576 2577 create_cus_from_index_list (per_bfd, cu_list, cu_list_elements, 2578 &per_bfd->info, 0); 2579 2580 if (dwz_elements == 0) 2581 return; 2582 2583 dwz_file *dwz = dwarf2_get_dwz_file (per_bfd); 2584 create_cus_from_index_list (per_bfd, dwz_list, dwz_elements, 2585 &dwz->info, 1); 2586 } 2587 2588 /* Create the signatured type hash table from the index. */ 2589 2590 static void 2591 create_signatured_type_table_from_index 2592 (dwarf2_per_bfd *per_bfd, struct dwarf2_section_info *section, 2593 const gdb_byte *bytes, offset_type elements) 2594 { 2595 gdb_assert (per_bfd->all_type_units.empty ()); 2596 per_bfd->all_type_units.reserve (elements / 3); 2597 2598 htab_up sig_types_hash = allocate_signatured_type_table (); 2599 2600 for (offset_type i = 0; i < elements; i += 3) 2601 { 2602 struct signatured_type *sig_type; 2603 ULONGEST signature; 2604 void **slot; 2605 cu_offset type_offset_in_tu; 2606 2607 gdb_static_assert (sizeof (ULONGEST) >= 8); 2608 sect_offset sect_off 2609 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE); 2610 type_offset_in_tu 2611 = (cu_offset) extract_unsigned_integer (bytes + 8, 8, 2612 BFD_ENDIAN_LITTLE); 2613 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE); 2614 bytes += 3 * 8; 2615 2616 sig_type = per_bfd->allocate_signatured_type (); 2617 sig_type->signature = signature; 2618 sig_type->type_offset_in_tu = type_offset_in_tu; 2619 sig_type->per_cu.is_debug_types = 1; 2620 sig_type->per_cu.section = section; 2621 sig_type->per_cu.sect_off = sect_off; 2622 sig_type->per_cu.v.quick 2623 = OBSTACK_ZALLOC (&per_bfd->obstack, 2624 struct dwarf2_per_cu_quick_data); 2625 2626 slot = htab_find_slot (sig_types_hash.get (), sig_type, INSERT); 2627 *slot = sig_type; 2628 2629 per_bfd->all_type_units.push_back (sig_type); 2630 } 2631 2632 per_bfd->signatured_types = std::move (sig_types_hash); 2633 } 2634 2635 /* Create the signatured type hash table from .debug_names. */ 2636 2637 static void 2638 create_signatured_type_table_from_debug_names 2639 (dwarf2_per_objfile *per_objfile, 2640 const mapped_debug_names &map, 2641 struct dwarf2_section_info *section, 2642 struct dwarf2_section_info *abbrev_section) 2643 { 2644 struct objfile *objfile = per_objfile->objfile; 2645 2646 section->read (objfile); 2647 abbrev_section->read (objfile); 2648 2649 gdb_assert (per_objfile->per_bfd->all_type_units.empty ()); 2650 per_objfile->per_bfd->all_type_units.reserve (map.tu_count); 2651 2652 htab_up sig_types_hash = allocate_signatured_type_table (); 2653 2654 for (uint32_t i = 0; i < map.tu_count; ++i) 2655 { 2656 struct signatured_type *sig_type; 2657 void **slot; 2658 2659 sect_offset sect_off 2660 = (sect_offset) (extract_unsigned_integer 2661 (map.tu_table_reordered + i * map.offset_size, 2662 map.offset_size, 2663 map.dwarf5_byte_order)); 2664 2665 comp_unit_head cu_header; 2666 read_and_check_comp_unit_head (per_objfile, &cu_header, section, 2667 abbrev_section, 2668 section->buffer + to_underlying (sect_off), 2669 rcuh_kind::TYPE); 2670 2671 sig_type = per_objfile->per_bfd->allocate_signatured_type (); 2672 sig_type->signature = cu_header.signature; 2673 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu; 2674 sig_type->per_cu.is_debug_types = 1; 2675 sig_type->per_cu.section = section; 2676 sig_type->per_cu.sect_off = sect_off; 2677 sig_type->per_cu.v.quick 2678 = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, 2679 struct dwarf2_per_cu_quick_data); 2680 2681 slot = htab_find_slot (sig_types_hash.get (), sig_type, INSERT); 2682 *slot = sig_type; 2683 2684 per_objfile->per_bfd->all_type_units.push_back (sig_type); 2685 } 2686 2687 per_objfile->per_bfd->signatured_types = std::move (sig_types_hash); 2688 } 2689 2690 /* Read the address map data from the mapped index, and use it to 2691 populate the objfile's psymtabs_addrmap. */ 2692 2693 static void 2694 create_addrmap_from_index (dwarf2_per_objfile *per_objfile, 2695 struct mapped_index *index) 2696 { 2697 struct objfile *objfile = per_objfile->objfile; 2698 struct gdbarch *gdbarch = objfile->arch (); 2699 const gdb_byte *iter, *end; 2700 struct addrmap *mutable_map; 2701 CORE_ADDR baseaddr; 2702 2703 auto_obstack temp_obstack; 2704 2705 mutable_map = addrmap_create_mutable (&temp_obstack); 2706 2707 iter = index->address_table.data (); 2708 end = iter + index->address_table.size (); 2709 2710 baseaddr = objfile->text_section_offset (); 2711 2712 while (iter < end) 2713 { 2714 ULONGEST hi, lo, cu_index; 2715 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE); 2716 iter += 8; 2717 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE); 2718 iter += 8; 2719 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE); 2720 iter += 4; 2721 2722 if (lo > hi) 2723 { 2724 complaint (_(".gdb_index address table has invalid range (%s - %s)"), 2725 hex_string (lo), hex_string (hi)); 2726 continue; 2727 } 2728 2729 if (cu_index >= per_objfile->per_bfd->all_comp_units.size ()) 2730 { 2731 complaint (_(".gdb_index address table has invalid CU number %u"), 2732 (unsigned) cu_index); 2733 continue; 2734 } 2735 2736 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr) - baseaddr; 2737 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr) - baseaddr; 2738 addrmap_set_empty (mutable_map, lo, hi - 1, 2739 per_objfile->per_bfd->get_cu (cu_index)); 2740 } 2741 2742 objfile->partial_symtabs->psymtabs_addrmap 2743 = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ()); 2744 } 2745 2746 /* Read the address map data from DWARF-5 .debug_aranges, and use it to 2747 populate the objfile's psymtabs_addrmap. */ 2748 2749 static void 2750 create_addrmap_from_aranges (dwarf2_per_objfile *per_objfile, 2751 struct dwarf2_section_info *section) 2752 { 2753 struct objfile *objfile = per_objfile->objfile; 2754 bfd *abfd = objfile->obfd; 2755 struct gdbarch *gdbarch = objfile->arch (); 2756 const CORE_ADDR baseaddr = objfile->text_section_offset (); 2757 2758 auto_obstack temp_obstack; 2759 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack); 2760 2761 std::unordered_map<sect_offset, 2762 dwarf2_per_cu_data *, 2763 gdb::hash_enum<sect_offset>> 2764 debug_info_offset_to_per_cu; 2765 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 2766 { 2767 const auto insertpair 2768 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu); 2769 if (!insertpair.second) 2770 { 2771 warning (_("Section .debug_aranges in %s has duplicate " 2772 "debug_info_offset %s, ignoring .debug_aranges."), 2773 objfile_name (objfile), sect_offset_str (per_cu->sect_off)); 2774 return; 2775 } 2776 } 2777 2778 section->read (objfile); 2779 2780 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch); 2781 2782 const gdb_byte *addr = section->buffer; 2783 2784 while (addr < section->buffer + section->size) 2785 { 2786 const gdb_byte *const entry_addr = addr; 2787 unsigned int bytes_read; 2788 2789 const LONGEST entry_length = read_initial_length (abfd, addr, 2790 &bytes_read); 2791 addr += bytes_read; 2792 2793 const gdb_byte *const entry_end = addr + entry_length; 2794 const bool dwarf5_is_dwarf64 = bytes_read != 4; 2795 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4; 2796 if (addr + entry_length > section->buffer + section->size) 2797 { 2798 warning (_("Section .debug_aranges in %s entry at offset %s " 2799 "length %s exceeds section length %s, " 2800 "ignoring .debug_aranges."), 2801 objfile_name (objfile), 2802 plongest (entry_addr - section->buffer), 2803 plongest (bytes_read + entry_length), 2804 pulongest (section->size)); 2805 return; 2806 } 2807 2808 /* The version number. */ 2809 const uint16_t version = read_2_bytes (abfd, addr); 2810 addr += 2; 2811 if (version != 2) 2812 { 2813 warning (_("Section .debug_aranges in %s entry at offset %s " 2814 "has unsupported version %d, ignoring .debug_aranges."), 2815 objfile_name (objfile), 2816 plongest (entry_addr - section->buffer), version); 2817 return; 2818 } 2819 2820 const uint64_t debug_info_offset 2821 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order); 2822 addr += offset_size; 2823 const auto per_cu_it 2824 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset)); 2825 if (per_cu_it == debug_info_offset_to_per_cu.cend ()) 2826 { 2827 warning (_("Section .debug_aranges in %s entry at offset %s " 2828 "debug_info_offset %s does not exists, " 2829 "ignoring .debug_aranges."), 2830 objfile_name (objfile), 2831 plongest (entry_addr - section->buffer), 2832 pulongest (debug_info_offset)); 2833 return; 2834 } 2835 dwarf2_per_cu_data *const per_cu = per_cu_it->second; 2836 2837 const uint8_t address_size = *addr++; 2838 if (address_size < 1 || address_size > 8) 2839 { 2840 warning (_("Section .debug_aranges in %s entry at offset %s " 2841 "address_size %u is invalid, ignoring .debug_aranges."), 2842 objfile_name (objfile), 2843 plongest (entry_addr - section->buffer), address_size); 2844 return; 2845 } 2846 2847 const uint8_t segment_selector_size = *addr++; 2848 if (segment_selector_size != 0) 2849 { 2850 warning (_("Section .debug_aranges in %s entry at offset %s " 2851 "segment_selector_size %u is not supported, " 2852 "ignoring .debug_aranges."), 2853 objfile_name (objfile), 2854 plongest (entry_addr - section->buffer), 2855 segment_selector_size); 2856 return; 2857 } 2858 2859 /* Must pad to an alignment boundary that is twice the address 2860 size. It is undocumented by the DWARF standard but GCC does 2861 use it. */ 2862 for (size_t padding = ((-(addr - section->buffer)) 2863 & (2 * address_size - 1)); 2864 padding > 0; padding--) 2865 if (*addr++ != 0) 2866 { 2867 warning (_("Section .debug_aranges in %s entry at offset %s " 2868 "padding is not zero, ignoring .debug_aranges."), 2869 objfile_name (objfile), 2870 plongest (entry_addr - section->buffer)); 2871 return; 2872 } 2873 2874 for (;;) 2875 { 2876 if (addr + 2 * address_size > entry_end) 2877 { 2878 warning (_("Section .debug_aranges in %s entry at offset %s " 2879 "address list is not properly terminated, " 2880 "ignoring .debug_aranges."), 2881 objfile_name (objfile), 2882 plongest (entry_addr - section->buffer)); 2883 return; 2884 } 2885 ULONGEST start = extract_unsigned_integer (addr, address_size, 2886 dwarf5_byte_order); 2887 addr += address_size; 2888 ULONGEST length = extract_unsigned_integer (addr, address_size, 2889 dwarf5_byte_order); 2890 addr += address_size; 2891 if (start == 0 && length == 0) 2892 break; 2893 if (start == 0 && !per_objfile->per_bfd->has_section_at_zero) 2894 { 2895 /* Symbol was eliminated due to a COMDAT group. */ 2896 continue; 2897 } 2898 ULONGEST end = start + length; 2899 start = (gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr) 2900 - baseaddr); 2901 end = (gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr) 2902 - baseaddr); 2903 addrmap_set_empty (mutable_map, start, end - 1, per_cu); 2904 } 2905 } 2906 2907 objfile->partial_symtabs->psymtabs_addrmap 2908 = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ()); 2909 } 2910 2911 /* Find a slot in the mapped index INDEX for the object named NAME. 2912 If NAME is found, set *VEC_OUT to point to the CU vector in the 2913 constant pool and return true. If NAME cannot be found, return 2914 false. */ 2915 2916 static bool 2917 find_slot_in_mapped_hash (struct mapped_index *index, const char *name, 2918 offset_type **vec_out) 2919 { 2920 offset_type hash; 2921 offset_type slot, step; 2922 int (*cmp) (const char *, const char *); 2923 2924 gdb::unique_xmalloc_ptr<char> without_params; 2925 if (current_language->la_language == language_cplus 2926 || current_language->la_language == language_fortran 2927 || current_language->la_language == language_d) 2928 { 2929 /* NAME is already canonical. Drop any qualifiers as .gdb_index does 2930 not contain any. */ 2931 2932 if (strchr (name, '(') != NULL) 2933 { 2934 without_params = cp_remove_params (name); 2935 2936 if (without_params != NULL) 2937 name = without_params.get (); 2938 } 2939 } 2940 2941 /* Index version 4 did not support case insensitive searches. But the 2942 indices for case insensitive languages are built in lowercase, therefore 2943 simulate our NAME being searched is also lowercased. */ 2944 hash = mapped_index_string_hash ((index->version == 4 2945 && case_sensitivity == case_sensitive_off 2946 ? 5 : index->version), 2947 name); 2948 2949 slot = hash & (index->symbol_table.size () - 1); 2950 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1; 2951 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp); 2952 2953 for (;;) 2954 { 2955 const char *str; 2956 2957 const auto &bucket = index->symbol_table[slot]; 2958 if (bucket.name == 0 && bucket.vec == 0) 2959 return false; 2960 2961 str = index->constant_pool + MAYBE_SWAP (bucket.name); 2962 if (!cmp (name, str)) 2963 { 2964 *vec_out = (offset_type *) (index->constant_pool 2965 + MAYBE_SWAP (bucket.vec)); 2966 return true; 2967 } 2968 2969 slot = (slot + step) & (index->symbol_table.size () - 1); 2970 } 2971 } 2972 2973 /* A helper function that reads the .gdb_index from BUFFER and fills 2974 in MAP. FILENAME is the name of the file containing the data; 2975 it is used for error reporting. DEPRECATED_OK is true if it is 2976 ok to use deprecated sections. 2977 2978 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are 2979 out parameters that are filled in with information about the CU and 2980 TU lists in the section. 2981 2982 Returns true if all went well, false otherwise. */ 2983 2984 static bool 2985 read_gdb_index_from_buffer (const char *filename, 2986 bool deprecated_ok, 2987 gdb::array_view<const gdb_byte> buffer, 2988 struct mapped_index *map, 2989 const gdb_byte **cu_list, 2990 offset_type *cu_list_elements, 2991 const gdb_byte **types_list, 2992 offset_type *types_list_elements) 2993 { 2994 const gdb_byte *addr = &buffer[0]; 2995 2996 /* Version check. */ 2997 offset_type version = MAYBE_SWAP (*(offset_type *) addr); 2998 /* Versions earlier than 3 emitted every copy of a psymbol. This 2999 causes the index to behave very poorly for certain requests. Version 3 3000 contained incomplete addrmap. So, it seems better to just ignore such 3001 indices. */ 3002 if (version < 4) 3003 { 3004 static int warning_printed = 0; 3005 if (!warning_printed) 3006 { 3007 warning (_("Skipping obsolete .gdb_index section in %s."), 3008 filename); 3009 warning_printed = 1; 3010 } 3011 return 0; 3012 } 3013 /* Index version 4 uses a different hash function than index version 3014 5 and later. 3015 3016 Versions earlier than 6 did not emit psymbols for inlined 3017 functions. Using these files will cause GDB not to be able to 3018 set breakpoints on inlined functions by name, so we ignore these 3019 indices unless the user has done 3020 "set use-deprecated-index-sections on". */ 3021 if (version < 6 && !deprecated_ok) 3022 { 3023 static int warning_printed = 0; 3024 if (!warning_printed) 3025 { 3026 warning (_("\ 3027 Skipping deprecated .gdb_index section in %s.\n\ 3028 Do \"set use-deprecated-index-sections on\" before the file is read\n\ 3029 to use the section anyway."), 3030 filename); 3031 warning_printed = 1; 3032 } 3033 return 0; 3034 } 3035 /* Version 7 indices generated by gold refer to the CU for a symbol instead 3036 of the TU (for symbols coming from TUs), 3037 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. 3038 Plus gold-generated indices can have duplicate entries for global symbols, 3039 http://sourceware.org/bugzilla/show_bug.cgi?id=15646. 3040 These are just performance bugs, and we can't distinguish gdb-generated 3041 indices from gold-generated ones, so issue no warning here. */ 3042 3043 /* Indexes with higher version than the one supported by GDB may be no 3044 longer backward compatible. */ 3045 if (version > 8) 3046 return 0; 3047 3048 map->version = version; 3049 3050 offset_type *metadata = (offset_type *) (addr + sizeof (offset_type)); 3051 3052 int i = 0; 3053 *cu_list = addr + MAYBE_SWAP (metadata[i]); 3054 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i])) 3055 / 8); 3056 ++i; 3057 3058 *types_list = addr + MAYBE_SWAP (metadata[i]); 3059 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1]) 3060 - MAYBE_SWAP (metadata[i])) 3061 / 8); 3062 ++i; 3063 3064 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]); 3065 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]); 3066 map->address_table 3067 = gdb::array_view<const gdb_byte> (address_table, address_table_end); 3068 ++i; 3069 3070 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]); 3071 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]); 3072 map->symbol_table 3073 = gdb::array_view<mapped_index::symbol_table_slot> 3074 ((mapped_index::symbol_table_slot *) symbol_table, 3075 (mapped_index::symbol_table_slot *) symbol_table_end); 3076 3077 ++i; 3078 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i])); 3079 3080 return 1; 3081 } 3082 3083 /* Callback types for dwarf2_read_gdb_index. */ 3084 3085 typedef gdb::function_view 3086 <gdb::array_view<const gdb_byte>(objfile *, dwarf2_per_bfd *)> 3087 get_gdb_index_contents_ftype; 3088 typedef gdb::function_view 3089 <gdb::array_view<const gdb_byte>(objfile *, dwz_file *)> 3090 get_gdb_index_contents_dwz_ftype; 3091 3092 /* Read .gdb_index. If everything went ok, initialize the "quick" 3093 elements of all the CUs and return 1. Otherwise, return 0. */ 3094 3095 static int 3096 dwarf2_read_gdb_index 3097 (dwarf2_per_objfile *per_objfile, 3098 get_gdb_index_contents_ftype get_gdb_index_contents, 3099 get_gdb_index_contents_dwz_ftype get_gdb_index_contents_dwz) 3100 { 3101 const gdb_byte *cu_list, *types_list, *dwz_list = NULL; 3102 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0; 3103 struct dwz_file *dwz; 3104 struct objfile *objfile = per_objfile->objfile; 3105 dwarf2_per_bfd *per_bfd = per_objfile->per_bfd; 3106 3107 gdb::array_view<const gdb_byte> main_index_contents 3108 = get_gdb_index_contents (objfile, per_bfd); 3109 3110 if (main_index_contents.empty ()) 3111 return 0; 3112 3113 std::unique_ptr<struct mapped_index> map (new struct mapped_index); 3114 if (!read_gdb_index_from_buffer (objfile_name (objfile), 3115 use_deprecated_index_sections, 3116 main_index_contents, map.get (), &cu_list, 3117 &cu_list_elements, &types_list, 3118 &types_list_elements)) 3119 return 0; 3120 3121 /* Don't use the index if it's empty. */ 3122 if (map->symbol_table.empty ()) 3123 return 0; 3124 3125 /* If there is a .dwz file, read it so we can get its CU list as 3126 well. */ 3127 dwz = dwarf2_get_dwz_file (per_bfd); 3128 if (dwz != NULL) 3129 { 3130 struct mapped_index dwz_map; 3131 const gdb_byte *dwz_types_ignore; 3132 offset_type dwz_types_elements_ignore; 3133 3134 gdb::array_view<const gdb_byte> dwz_index_content 3135 = get_gdb_index_contents_dwz (objfile, dwz); 3136 3137 if (dwz_index_content.empty ()) 3138 return 0; 3139 3140 if (!read_gdb_index_from_buffer (bfd_get_filename (dwz->dwz_bfd.get ()), 3141 1, dwz_index_content, &dwz_map, 3142 &dwz_list, &dwz_list_elements, 3143 &dwz_types_ignore, 3144 &dwz_types_elements_ignore)) 3145 { 3146 warning (_("could not read '.gdb_index' section from %s; skipping"), 3147 bfd_get_filename (dwz->dwz_bfd.get ())); 3148 return 0; 3149 } 3150 } 3151 3152 create_cus_from_index (per_bfd, cu_list, cu_list_elements, dwz_list, 3153 dwz_list_elements); 3154 3155 if (types_list_elements) 3156 { 3157 /* We can only handle a single .debug_types when we have an 3158 index. */ 3159 if (per_bfd->types.size () != 1) 3160 return 0; 3161 3162 dwarf2_section_info *section = &per_bfd->types[0]; 3163 3164 create_signatured_type_table_from_index (per_bfd, section, types_list, 3165 types_list_elements); 3166 } 3167 3168 create_addrmap_from_index (per_objfile, map.get ()); 3169 3170 per_bfd->index_table = std::move (map); 3171 per_bfd->using_index = 1; 3172 per_bfd->quick_file_names_table = 3173 create_quick_file_names_table (per_bfd->all_comp_units.size ()); 3174 3175 /* Save partial symtabs in the per_bfd object, for the benefit of subsequent 3176 objfiles using the same BFD. */ 3177 gdb_assert (per_bfd->partial_symtabs == nullptr); 3178 per_bfd->partial_symtabs = objfile->partial_symtabs; 3179 3180 return 1; 3181 } 3182 3183 /* die_reader_func for dw2_get_file_names. */ 3184 3185 static void 3186 dw2_get_file_names_reader (const struct die_reader_specs *reader, 3187 const gdb_byte *info_ptr, 3188 struct die_info *comp_unit_die) 3189 { 3190 struct dwarf2_cu *cu = reader->cu; 3191 struct dwarf2_per_cu_data *this_cu = cu->per_cu; 3192 dwarf2_per_objfile *per_objfile = cu->per_objfile; 3193 struct dwarf2_per_cu_data *lh_cu; 3194 struct attribute *attr; 3195 void **slot; 3196 struct quick_file_names *qfn; 3197 3198 gdb_assert (! this_cu->is_debug_types); 3199 3200 /* Our callers never want to match partial units -- instead they 3201 will match the enclosing full CU. */ 3202 if (comp_unit_die->tag == DW_TAG_partial_unit) 3203 { 3204 this_cu->v.quick->no_file_data = 1; 3205 return; 3206 } 3207 3208 lh_cu = this_cu; 3209 slot = NULL; 3210 3211 line_header_up lh; 3212 sect_offset line_offset {}; 3213 3214 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu); 3215 if (attr != nullptr) 3216 { 3217 struct quick_file_names find_entry; 3218 3219 line_offset = (sect_offset) DW_UNSND (attr); 3220 3221 /* We may have already read in this line header (TU line header sharing). 3222 If we have we're done. */ 3223 find_entry.hash.dwo_unit = cu->dwo_unit; 3224 find_entry.hash.line_sect_off = line_offset; 3225 slot = htab_find_slot (per_objfile->per_bfd->quick_file_names_table.get (), 3226 &find_entry, INSERT); 3227 if (*slot != NULL) 3228 { 3229 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot; 3230 return; 3231 } 3232 3233 lh = dwarf_decode_line_header (line_offset, cu); 3234 } 3235 if (lh == NULL) 3236 { 3237 lh_cu->v.quick->no_file_data = 1; 3238 return; 3239 } 3240 3241 qfn = XOBNEW (&per_objfile->per_bfd->obstack, struct quick_file_names); 3242 qfn->hash.dwo_unit = cu->dwo_unit; 3243 qfn->hash.line_sect_off = line_offset; 3244 gdb_assert (slot != NULL); 3245 *slot = qfn; 3246 3247 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu); 3248 3249 int offset = 0; 3250 if (strcmp (fnd.name, "<unknown>") != 0) 3251 ++offset; 3252 3253 qfn->num_file_names = offset + lh->file_names_size (); 3254 qfn->file_names = 3255 XOBNEWVEC (&per_objfile->per_bfd->obstack, const char *, 3256 qfn->num_file_names); 3257 if (offset != 0) 3258 qfn->file_names[0] = xstrdup (fnd.name); 3259 for (int i = 0; i < lh->file_names_size (); ++i) 3260 qfn->file_names[i + offset] = lh->file_full_name (i + 1, 3261 fnd.comp_dir).release (); 3262 qfn->real_names = NULL; 3263 3264 lh_cu->v.quick->file_names = qfn; 3265 } 3266 3267 /* A helper for the "quick" functions which attempts to read the line 3268 table for THIS_CU. */ 3269 3270 static struct quick_file_names * 3271 dw2_get_file_names (dwarf2_per_cu_data *this_cu, 3272 dwarf2_per_objfile *per_objfile) 3273 { 3274 /* This should never be called for TUs. */ 3275 gdb_assert (! this_cu->is_debug_types); 3276 /* Nor type unit groups. */ 3277 gdb_assert (! this_cu->type_unit_group_p ()); 3278 3279 if (this_cu->v.quick->file_names != NULL) 3280 return this_cu->v.quick->file_names; 3281 /* If we know there is no line data, no point in looking again. */ 3282 if (this_cu->v.quick->no_file_data) 3283 return NULL; 3284 3285 cutu_reader reader (this_cu, per_objfile); 3286 if (!reader.dummy_p) 3287 dw2_get_file_names_reader (&reader, reader.info_ptr, reader.comp_unit_die); 3288 3289 if (this_cu->v.quick->no_file_data) 3290 return NULL; 3291 return this_cu->v.quick->file_names; 3292 } 3293 3294 /* A helper for the "quick" functions which computes and caches the 3295 real path for a given file name from the line table. */ 3296 3297 static const char * 3298 dw2_get_real_path (dwarf2_per_objfile *per_objfile, 3299 struct quick_file_names *qfn, int index) 3300 { 3301 if (qfn->real_names == NULL) 3302 qfn->real_names = OBSTACK_CALLOC (&per_objfile->per_bfd->obstack, 3303 qfn->num_file_names, const char *); 3304 3305 if (qfn->real_names[index] == NULL) 3306 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release (); 3307 3308 return qfn->real_names[index]; 3309 } 3310 3311 static struct symtab * 3312 dw2_find_last_source_symtab (struct objfile *objfile) 3313 { 3314 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3315 dwarf2_per_cu_data *dwarf_cu = per_objfile->per_bfd->all_comp_units.back (); 3316 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu, per_objfile, false); 3317 3318 if (cust == NULL) 3319 return NULL; 3320 3321 return compunit_primary_filetab (cust); 3322 } 3323 3324 /* Traversal function for dw2_forget_cached_source_info. */ 3325 3326 static int 3327 dw2_free_cached_file_names (void **slot, void *info) 3328 { 3329 struct quick_file_names *file_data = (struct quick_file_names *) *slot; 3330 3331 if (file_data->real_names) 3332 { 3333 int i; 3334 3335 for (i = 0; i < file_data->num_file_names; ++i) 3336 { 3337 xfree ((void*) file_data->real_names[i]); 3338 file_data->real_names[i] = NULL; 3339 } 3340 } 3341 3342 return 1; 3343 } 3344 3345 static void 3346 dw2_forget_cached_source_info (struct objfile *objfile) 3347 { 3348 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3349 3350 htab_traverse_noresize (per_objfile->per_bfd->quick_file_names_table.get (), 3351 dw2_free_cached_file_names, NULL); 3352 } 3353 3354 /* Helper function for dw2_map_symtabs_matching_filename that expands 3355 the symtabs and calls the iterator. */ 3356 3357 static int 3358 dw2_map_expand_apply (struct objfile *objfile, 3359 struct dwarf2_per_cu_data *per_cu, 3360 const char *name, const char *real_path, 3361 gdb::function_view<bool (symtab *)> callback) 3362 { 3363 struct compunit_symtab *last_made = objfile->compunit_symtabs; 3364 3365 /* Don't visit already-expanded CUs. */ 3366 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3367 if (per_objfile->symtab_set_p (per_cu)) 3368 return 0; 3369 3370 /* This may expand more than one symtab, and we want to iterate over 3371 all of them. */ 3372 dw2_instantiate_symtab (per_cu, per_objfile, false); 3373 3374 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs, 3375 last_made, callback); 3376 } 3377 3378 /* Implementation of the map_symtabs_matching_filename method. */ 3379 3380 static bool 3381 dw2_map_symtabs_matching_filename 3382 (struct objfile *objfile, const char *name, const char *real_path, 3383 gdb::function_view<bool (symtab *)> callback) 3384 { 3385 const char *name_basename = lbasename (name); 3386 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3387 3388 /* The rule is CUs specify all the files, including those used by 3389 any TU, so there's no need to scan TUs here. */ 3390 3391 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 3392 { 3393 /* We only need to look at symtabs not already expanded. */ 3394 if (per_objfile->symtab_set_p (per_cu)) 3395 continue; 3396 3397 quick_file_names *file_data = dw2_get_file_names (per_cu, per_objfile); 3398 if (file_data == NULL) 3399 continue; 3400 3401 for (int j = 0; j < file_data->num_file_names; ++j) 3402 { 3403 const char *this_name = file_data->file_names[j]; 3404 const char *this_real_name; 3405 3406 if (compare_filenames_for_search (this_name, name)) 3407 { 3408 if (dw2_map_expand_apply (objfile, per_cu, name, real_path, 3409 callback)) 3410 return true; 3411 continue; 3412 } 3413 3414 /* Before we invoke realpath, which can get expensive when many 3415 files are involved, do a quick comparison of the basenames. */ 3416 if (! basenames_may_differ 3417 && FILENAME_CMP (lbasename (this_name), name_basename) != 0) 3418 continue; 3419 3420 this_real_name = dw2_get_real_path (per_objfile, file_data, j); 3421 if (compare_filenames_for_search (this_real_name, name)) 3422 { 3423 if (dw2_map_expand_apply (objfile, per_cu, name, real_path, 3424 callback)) 3425 return true; 3426 continue; 3427 } 3428 3429 if (real_path != NULL) 3430 { 3431 gdb_assert (IS_ABSOLUTE_PATH (real_path)); 3432 gdb_assert (IS_ABSOLUTE_PATH (name)); 3433 if (this_real_name != NULL 3434 && FILENAME_CMP (real_path, this_real_name) == 0) 3435 { 3436 if (dw2_map_expand_apply (objfile, per_cu, name, real_path, 3437 callback)) 3438 return true; 3439 continue; 3440 } 3441 } 3442 } 3443 } 3444 3445 return false; 3446 } 3447 3448 /* Struct used to manage iterating over all CUs looking for a symbol. */ 3449 3450 struct dw2_symtab_iterator 3451 { 3452 /* The dwarf2_per_objfile owning the CUs we are iterating on. */ 3453 dwarf2_per_objfile *per_objfile; 3454 /* If set, only look for symbols that match that block. Valid values are 3455 GLOBAL_BLOCK and STATIC_BLOCK. */ 3456 gdb::optional<block_enum> block_index; 3457 /* The kind of symbol we're looking for. */ 3458 domain_enum domain; 3459 /* The list of CUs from the index entry of the symbol, 3460 or NULL if not found. */ 3461 offset_type *vec; 3462 /* The next element in VEC to look at. */ 3463 int next; 3464 /* The number of elements in VEC, or zero if there is no match. */ 3465 int length; 3466 /* Have we seen a global version of the symbol? 3467 If so we can ignore all further global instances. 3468 This is to work around gold/15646, inefficient gold-generated 3469 indices. */ 3470 int global_seen; 3471 }; 3472 3473 /* Initialize the index symtab iterator ITER, common part. */ 3474 3475 static void 3476 dw2_symtab_iter_init_common (struct dw2_symtab_iterator *iter, 3477 dwarf2_per_objfile *per_objfile, 3478 gdb::optional<block_enum> block_index, 3479 domain_enum domain) 3480 { 3481 iter->per_objfile = per_objfile; 3482 iter->block_index = block_index; 3483 iter->domain = domain; 3484 iter->next = 0; 3485 iter->global_seen = 0; 3486 iter->vec = NULL; 3487 iter->length = 0; 3488 } 3489 3490 /* Initialize the index symtab iterator ITER, const char *NAME variant. */ 3491 3492 static void 3493 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter, 3494 dwarf2_per_objfile *per_objfile, 3495 gdb::optional<block_enum> block_index, 3496 domain_enum domain, 3497 const char *name) 3498 { 3499 dw2_symtab_iter_init_common (iter, per_objfile, block_index, domain); 3500 3501 mapped_index *index = per_objfile->per_bfd->index_table.get (); 3502 /* index is NULL if OBJF_READNOW. */ 3503 if (index == NULL) 3504 return; 3505 3506 if (find_slot_in_mapped_hash (index, name, &iter->vec)) 3507 iter->length = MAYBE_SWAP (*iter->vec); 3508 } 3509 3510 /* Initialize the index symtab iterator ITER, offset_type NAMEI variant. */ 3511 3512 static void 3513 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter, 3514 dwarf2_per_objfile *per_objfile, 3515 gdb::optional<block_enum> block_index, 3516 domain_enum domain, offset_type namei) 3517 { 3518 dw2_symtab_iter_init_common (iter, per_objfile, block_index, domain); 3519 3520 mapped_index *index = per_objfile->per_bfd->index_table.get (); 3521 /* index is NULL if OBJF_READNOW. */ 3522 if (index == NULL) 3523 return; 3524 3525 gdb_assert (!index->symbol_name_slot_invalid (namei)); 3526 const auto &bucket = index->symbol_table[namei]; 3527 3528 iter->vec = (offset_type *) (index->constant_pool 3529 + MAYBE_SWAP (bucket.vec)); 3530 iter->length = MAYBE_SWAP (*iter->vec); 3531 } 3532 3533 /* Return the next matching CU or NULL if there are no more. */ 3534 3535 static struct dwarf2_per_cu_data * 3536 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter) 3537 { 3538 dwarf2_per_objfile *per_objfile = iter->per_objfile; 3539 3540 for ( ; iter->next < iter->length; ++iter->next) 3541 { 3542 offset_type cu_index_and_attrs = 3543 MAYBE_SWAP (iter->vec[iter->next + 1]); 3544 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs); 3545 gdb_index_symbol_kind symbol_kind = 3546 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs); 3547 /* Only check the symbol attributes if they're present. 3548 Indices prior to version 7 don't record them, 3549 and indices >= 7 may elide them for certain symbols 3550 (gold does this). */ 3551 int attrs_valid = 3552 (per_objfile->per_bfd->index_table->version >= 7 3553 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE); 3554 3555 /* Don't crash on bad data. */ 3556 if (cu_index >= (per_objfile->per_bfd->all_comp_units.size () 3557 + per_objfile->per_bfd->all_type_units.size ())) 3558 { 3559 complaint (_(".gdb_index entry has bad CU index" 3560 " [in module %s]"), objfile_name (per_objfile->objfile)); 3561 continue; 3562 } 3563 3564 dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cutu (cu_index); 3565 3566 /* Skip if already read in. */ 3567 if (per_objfile->symtab_set_p (per_cu)) 3568 continue; 3569 3570 /* Check static vs global. */ 3571 if (attrs_valid) 3572 { 3573 bool is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs); 3574 3575 if (iter->block_index.has_value ()) 3576 { 3577 bool want_static = *iter->block_index == STATIC_BLOCK; 3578 3579 if (is_static != want_static) 3580 continue; 3581 } 3582 3583 /* Work around gold/15646. */ 3584 if (!is_static 3585 && symbol_kind == GDB_INDEX_SYMBOL_KIND_TYPE) 3586 { 3587 if (iter->global_seen) 3588 continue; 3589 3590 iter->global_seen = 1; 3591 } 3592 } 3593 3594 /* Only check the symbol's kind if it has one. */ 3595 if (attrs_valid) 3596 { 3597 switch (iter->domain) 3598 { 3599 case VAR_DOMAIN: 3600 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE 3601 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION 3602 /* Some types are also in VAR_DOMAIN. */ 3603 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) 3604 continue; 3605 break; 3606 case STRUCT_DOMAIN: 3607 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) 3608 continue; 3609 break; 3610 case LABEL_DOMAIN: 3611 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER) 3612 continue; 3613 break; 3614 case MODULE_DOMAIN: 3615 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER) 3616 continue; 3617 break; 3618 default: 3619 break; 3620 } 3621 } 3622 3623 ++iter->next; 3624 return per_cu; 3625 } 3626 3627 return NULL; 3628 } 3629 3630 static struct compunit_symtab * 3631 dw2_lookup_symbol (struct objfile *objfile, block_enum block_index, 3632 const char *name, domain_enum domain) 3633 { 3634 struct compunit_symtab *stab_best = NULL; 3635 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3636 3637 lookup_name_info lookup_name (name, symbol_name_match_type::FULL); 3638 3639 struct dw2_symtab_iterator iter; 3640 struct dwarf2_per_cu_data *per_cu; 3641 3642 dw2_symtab_iter_init (&iter, per_objfile, block_index, domain, name); 3643 3644 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL) 3645 { 3646 struct symbol *sym, *with_opaque = NULL; 3647 struct compunit_symtab *stab 3648 = dw2_instantiate_symtab (per_cu, per_objfile, false); 3649 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab); 3650 const struct block *block = BLOCKVECTOR_BLOCK (bv, block_index); 3651 3652 sym = block_find_symbol (block, name, domain, 3653 block_find_non_opaque_type_preferred, 3654 &with_opaque); 3655 3656 /* Some caution must be observed with overloaded functions 3657 and methods, since the index will not contain any overload 3658 information (but NAME might contain it). */ 3659 3660 if (sym != NULL 3661 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name)) 3662 return stab; 3663 if (with_opaque != NULL 3664 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name)) 3665 stab_best = stab; 3666 3667 /* Keep looking through other CUs. */ 3668 } 3669 3670 return stab_best; 3671 } 3672 3673 static void 3674 dw2_print_stats (struct objfile *objfile) 3675 { 3676 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3677 int total = (per_objfile->per_bfd->all_comp_units.size () 3678 + per_objfile->per_bfd->all_type_units.size ()); 3679 int count = 0; 3680 3681 for (int i = 0; i < total; ++i) 3682 { 3683 dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cutu (i); 3684 3685 if (!per_objfile->symtab_set_p (per_cu)) 3686 ++count; 3687 } 3688 printf_filtered (_(" Number of read CUs: %d\n"), total - count); 3689 printf_filtered (_(" Number of unread CUs: %d\n"), count); 3690 } 3691 3692 /* This dumps minimal information about the index. 3693 It is called via "mt print objfiles". 3694 One use is to verify .gdb_index has been loaded by the 3695 gdb.dwarf2/gdb-index.exp testcase. */ 3696 3697 static void 3698 dw2_dump (struct objfile *objfile) 3699 { 3700 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3701 3702 gdb_assert (per_objfile->per_bfd->using_index); 3703 printf_filtered (".gdb_index:"); 3704 if (per_objfile->per_bfd->index_table != NULL) 3705 { 3706 printf_filtered (" version %d\n", 3707 per_objfile->per_bfd->index_table->version); 3708 } 3709 else 3710 printf_filtered (" faked for \"readnow\"\n"); 3711 printf_filtered ("\n"); 3712 } 3713 3714 static void 3715 dw2_expand_symtabs_for_function (struct objfile *objfile, 3716 const char *func_name) 3717 { 3718 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3719 3720 struct dw2_symtab_iterator iter; 3721 struct dwarf2_per_cu_data *per_cu; 3722 3723 dw2_symtab_iter_init (&iter, per_objfile, {}, VAR_DOMAIN, func_name); 3724 3725 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL) 3726 dw2_instantiate_symtab (per_cu, per_objfile, false); 3727 3728 } 3729 3730 static void 3731 dw2_expand_all_symtabs (struct objfile *objfile) 3732 { 3733 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3734 int total_units = (per_objfile->per_bfd->all_comp_units.size () 3735 + per_objfile->per_bfd->all_type_units.size ()); 3736 3737 for (int i = 0; i < total_units; ++i) 3738 { 3739 dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cutu (i); 3740 3741 /* We don't want to directly expand a partial CU, because if we 3742 read it with the wrong language, then assertion failures can 3743 be triggered later on. See PR symtab/23010. So, tell 3744 dw2_instantiate_symtab to skip partial CUs -- any important 3745 partial CU will be read via DW_TAG_imported_unit anyway. */ 3746 dw2_instantiate_symtab (per_cu, per_objfile, true); 3747 } 3748 } 3749 3750 static void 3751 dw2_expand_symtabs_with_fullname (struct objfile *objfile, 3752 const char *fullname) 3753 { 3754 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3755 3756 /* We don't need to consider type units here. 3757 This is only called for examining code, e.g. expand_line_sal. 3758 There can be an order of magnitude (or more) more type units 3759 than comp units, and we avoid them if we can. */ 3760 3761 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 3762 { 3763 /* We only need to look at symtabs not already expanded. */ 3764 if (per_objfile->symtab_set_p (per_cu)) 3765 continue; 3766 3767 quick_file_names *file_data = dw2_get_file_names (per_cu, per_objfile); 3768 if (file_data == NULL) 3769 continue; 3770 3771 for (int j = 0; j < file_data->num_file_names; ++j) 3772 { 3773 const char *this_fullname = file_data->file_names[j]; 3774 3775 if (filename_cmp (this_fullname, fullname) == 0) 3776 { 3777 dw2_instantiate_symtab (per_cu, per_objfile, false); 3778 break; 3779 } 3780 } 3781 } 3782 } 3783 3784 static void 3785 dw2_expand_symtabs_matching_symbol 3786 (mapped_index_base &index, 3787 const lookup_name_info &lookup_name_in, 3788 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher, 3789 enum search_domain kind, 3790 gdb::function_view<bool (offset_type)> match_callback, 3791 dwarf2_per_objfile *per_objfile); 3792 3793 static void 3794 dw2_expand_symtabs_matching_one 3795 (dwarf2_per_cu_data *per_cu, 3796 dwarf2_per_objfile *per_objfile, 3797 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, 3798 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify); 3799 3800 static void 3801 dw2_map_matching_symbols 3802 (struct objfile *objfile, 3803 const lookup_name_info &name, domain_enum domain, 3804 int global, 3805 gdb::function_view<symbol_found_callback_ftype> callback, 3806 symbol_compare_ftype *ordered_compare) 3807 { 3808 /* Used for Ada. */ 3809 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 3810 3811 const block_enum block_kind = global ? GLOBAL_BLOCK : STATIC_BLOCK; 3812 3813 if (per_objfile->per_bfd->index_table != nullptr) 3814 { 3815 mapped_index &index = *per_objfile->per_bfd->index_table; 3816 3817 const char *match_name = name.ada ().lookup_name ().c_str (); 3818 auto matcher = [&] (const char *symname) 3819 { 3820 if (ordered_compare == nullptr) 3821 return true; 3822 return ordered_compare (symname, match_name) == 0; 3823 }; 3824 3825 dw2_expand_symtabs_matching_symbol (index, name, matcher, ALL_DOMAIN, 3826 [&] (offset_type namei) 3827 { 3828 struct dw2_symtab_iterator iter; 3829 struct dwarf2_per_cu_data *per_cu; 3830 3831 dw2_symtab_iter_init (&iter, per_objfile, block_kind, domain, 3832 namei); 3833 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL) 3834 dw2_expand_symtabs_matching_one (per_cu, per_objfile, nullptr, 3835 nullptr); 3836 return true; 3837 }, per_objfile); 3838 } 3839 else 3840 { 3841 /* We have -readnow: no .gdb_index, but no partial symtabs either. So, 3842 proceed assuming all symtabs have been read in. */ 3843 } 3844 3845 for (compunit_symtab *cust : objfile->compunits ()) 3846 { 3847 const struct block *block; 3848 3849 if (cust == NULL) 3850 continue; 3851 block = BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (cust), block_kind); 3852 if (!iterate_over_symbols_terminated (block, name, 3853 domain, callback)) 3854 return; 3855 } 3856 } 3857 3858 /* Starting from a search name, return the string that finds the upper 3859 bound of all strings that start with SEARCH_NAME in a sorted name 3860 list. Returns the empty string to indicate that the upper bound is 3861 the end of the list. */ 3862 3863 static std::string 3864 make_sort_after_prefix_name (const char *search_name) 3865 { 3866 /* When looking to complete "func", we find the upper bound of all 3867 symbols that start with "func" by looking for where we'd insert 3868 the closest string that would follow "func" in lexicographical 3869 order. Usually, that's "func"-with-last-character-incremented, 3870 i.e. "fund". Mind non-ASCII characters, though. Usually those 3871 will be UTF-8 multi-byte sequences, but we can't be certain. 3872 Especially mind the 0xff character, which is a valid character in 3873 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't 3874 rule out compilers allowing it in identifiers. Note that 3875 conveniently, strcmp/strcasecmp are specified to compare 3876 characters interpreted as unsigned char. So what we do is treat 3877 the whole string as a base 256 number composed of a sequence of 3878 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps 3879 to 0, and carries 1 to the following more-significant position. 3880 If the very first character in SEARCH_NAME ends up incremented 3881 and carries/overflows, then the upper bound is the end of the 3882 list. The string after the empty string is also the empty 3883 string. 3884 3885 Some examples of this operation: 3886 3887 SEARCH_NAME => "+1" RESULT 3888 3889 "abc" => "abd" 3890 "ab\xff" => "ac" 3891 "\xff" "a" "\xff" => "\xff" "b" 3892 "\xff" => "" 3893 "\xff\xff" => "" 3894 "" => "" 3895 3896 Then, with these symbols for example: 3897 3898 func 3899 func1 3900 fund 3901 3902 completing "func" looks for symbols between "func" and 3903 "func"-with-last-character-incremented, i.e. "fund" (exclusive), 3904 which finds "func" and "func1", but not "fund". 3905 3906 And with: 3907 3908 funcÿ (Latin1 'ÿ' [0xff]) 3909 funcÿ1 3910 fund 3911 3912 completing "funcÿ" looks for symbols between "funcÿ" and "fund" 3913 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund". 3914 3915 And with: 3916 3917 ÿÿ (Latin1 'ÿ' [0xff]) 3918 ÿÿ1 3919 3920 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and 3921 the end of the list. 3922 */ 3923 std::string after = search_name; 3924 while (!after.empty () && (unsigned char) after.back () == 0xff) 3925 after.pop_back (); 3926 if (!after.empty ()) 3927 after.back () = (unsigned char) after.back () + 1; 3928 return after; 3929 } 3930 3931 /* See declaration. */ 3932 3933 std::pair<std::vector<name_component>::const_iterator, 3934 std::vector<name_component>::const_iterator> 3935 mapped_index_base::find_name_components_bounds 3936 (const lookup_name_info &lookup_name_without_params, language lang, 3937 dwarf2_per_objfile *per_objfile) const 3938 { 3939 auto *name_cmp 3940 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp; 3941 3942 const char *lang_name 3943 = lookup_name_without_params.language_lookup_name (lang); 3944 3945 /* Comparison function object for lower_bound that matches against a 3946 given symbol name. */ 3947 auto lookup_compare_lower = [&] (const name_component &elem, 3948 const char *name) 3949 { 3950 const char *elem_qualified = this->symbol_name_at (elem.idx, per_objfile); 3951 const char *elem_name = elem_qualified + elem.name_offset; 3952 return name_cmp (elem_name, name) < 0; 3953 }; 3954 3955 /* Comparison function object for upper_bound that matches against a 3956 given symbol name. */ 3957 auto lookup_compare_upper = [&] (const char *name, 3958 const name_component &elem) 3959 { 3960 const char *elem_qualified = this->symbol_name_at (elem.idx, per_objfile); 3961 const char *elem_name = elem_qualified + elem.name_offset; 3962 return name_cmp (name, elem_name) < 0; 3963 }; 3964 3965 auto begin = this->name_components.begin (); 3966 auto end = this->name_components.end (); 3967 3968 /* Find the lower bound. */ 3969 auto lower = [&] () 3970 { 3971 if (lookup_name_without_params.completion_mode () && lang_name[0] == '\0') 3972 return begin; 3973 else 3974 return std::lower_bound (begin, end, lang_name, lookup_compare_lower); 3975 } (); 3976 3977 /* Find the upper bound. */ 3978 auto upper = [&] () 3979 { 3980 if (lookup_name_without_params.completion_mode ()) 3981 { 3982 /* In completion mode, we want UPPER to point past all 3983 symbols names that have the same prefix. I.e., with 3984 these symbols, and completing "func": 3985 3986 function << lower bound 3987 function1 3988 other_function << upper bound 3989 3990 We find the upper bound by looking for the insertion 3991 point of "func"-with-last-character-incremented, 3992 i.e. "fund". */ 3993 std::string after = make_sort_after_prefix_name (lang_name); 3994 if (after.empty ()) 3995 return end; 3996 return std::lower_bound (lower, end, after.c_str (), 3997 lookup_compare_lower); 3998 } 3999 else 4000 return std::upper_bound (lower, end, lang_name, lookup_compare_upper); 4001 } (); 4002 4003 return {lower, upper}; 4004 } 4005 4006 /* See declaration. */ 4007 4008 void 4009 mapped_index_base::build_name_components (dwarf2_per_objfile *per_objfile) 4010 { 4011 if (!this->name_components.empty ()) 4012 return; 4013 4014 this->name_components_casing = case_sensitivity; 4015 auto *name_cmp 4016 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp; 4017 4018 /* The code below only knows how to break apart components of C++ 4019 symbol names (and other languages that use '::' as 4020 namespace/module separator) and Ada symbol names. */ 4021 auto count = this->symbol_name_count (); 4022 for (offset_type idx = 0; idx < count; idx++) 4023 { 4024 if (this->symbol_name_slot_invalid (idx)) 4025 continue; 4026 4027 const char *name = this->symbol_name_at (idx, per_objfile); 4028 4029 /* Add each name component to the name component table. */ 4030 unsigned int previous_len = 0; 4031 4032 if (strstr (name, "::") != nullptr) 4033 { 4034 for (unsigned int current_len = cp_find_first_component (name); 4035 name[current_len] != '\0'; 4036 current_len += cp_find_first_component (name + current_len)) 4037 { 4038 gdb_assert (name[current_len] == ':'); 4039 this->name_components.push_back ({previous_len, idx}); 4040 /* Skip the '::'. */ 4041 current_len += 2; 4042 previous_len = current_len; 4043 } 4044 } 4045 else 4046 { 4047 /* Handle the Ada encoded (aka mangled) form here. */ 4048 for (const char *iter = strstr (name, "__"); 4049 iter != nullptr; 4050 iter = strstr (iter, "__")) 4051 { 4052 this->name_components.push_back ({previous_len, idx}); 4053 iter += 2; 4054 previous_len = iter - name; 4055 } 4056 } 4057 4058 this->name_components.push_back ({previous_len, idx}); 4059 } 4060 4061 /* Sort name_components elements by name. */ 4062 auto name_comp_compare = [&] (const name_component &left, 4063 const name_component &right) 4064 { 4065 const char *left_qualified 4066 = this->symbol_name_at (left.idx, per_objfile); 4067 const char *right_qualified 4068 = this->symbol_name_at (right.idx, per_objfile); 4069 4070 const char *left_name = left_qualified + left.name_offset; 4071 const char *right_name = right_qualified + right.name_offset; 4072 4073 return name_cmp (left_name, right_name) < 0; 4074 }; 4075 4076 std::sort (this->name_components.begin (), 4077 this->name_components.end (), 4078 name_comp_compare); 4079 } 4080 4081 /* Helper for dw2_expand_symtabs_matching that works with a 4082 mapped_index_base instead of the containing objfile. This is split 4083 to a separate function in order to be able to unit test the 4084 name_components matching using a mock mapped_index_base. For each 4085 symbol name that matches, calls MATCH_CALLBACK, passing it the 4086 symbol's index in the mapped_index_base symbol table. */ 4087 4088 static void 4089 dw2_expand_symtabs_matching_symbol 4090 (mapped_index_base &index, 4091 const lookup_name_info &lookup_name_in, 4092 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher, 4093 enum search_domain kind, 4094 gdb::function_view<bool (offset_type)> match_callback, 4095 dwarf2_per_objfile *per_objfile) 4096 { 4097 lookup_name_info lookup_name_without_params 4098 = lookup_name_in.make_ignore_params (); 4099 4100 /* Build the symbol name component sorted vector, if we haven't 4101 yet. */ 4102 index.build_name_components (per_objfile); 4103 4104 /* The same symbol may appear more than once in the range though. 4105 E.g., if we're looking for symbols that complete "w", and we have 4106 a symbol named "w1::w2", we'll find the two name components for 4107 that same symbol in the range. To be sure we only call the 4108 callback once per symbol, we first collect the symbol name 4109 indexes that matched in a temporary vector and ignore 4110 duplicates. */ 4111 std::vector<offset_type> matches; 4112 4113 struct name_and_matcher 4114 { 4115 symbol_name_matcher_ftype *matcher; 4116 const char *name; 4117 4118 bool operator== (const name_and_matcher &other) const 4119 { 4120 return matcher == other.matcher && strcmp (name, other.name) == 0; 4121 } 4122 }; 4123 4124 /* A vector holding all the different symbol name matchers, for all 4125 languages. */ 4126 std::vector<name_and_matcher> matchers; 4127 4128 for (int i = 0; i < nr_languages; i++) 4129 { 4130 enum language lang_e = (enum language) i; 4131 4132 const language_defn *lang = language_def (lang_e); 4133 symbol_name_matcher_ftype *name_matcher 4134 = lang->get_symbol_name_matcher (lookup_name_without_params); 4135 4136 name_and_matcher key { 4137 name_matcher, 4138 lookup_name_without_params.language_lookup_name (lang_e) 4139 }; 4140 4141 /* Don't insert the same comparison routine more than once. 4142 Note that we do this linear walk. This is not a problem in 4143 practice because the number of supported languages is 4144 low. */ 4145 if (std::find (matchers.begin (), matchers.end (), key) 4146 != matchers.end ()) 4147 continue; 4148 matchers.push_back (std::move (key)); 4149 4150 auto bounds 4151 = index.find_name_components_bounds (lookup_name_without_params, 4152 lang_e, per_objfile); 4153 4154 /* Now for each symbol name in range, check to see if we have a name 4155 match, and if so, call the MATCH_CALLBACK callback. */ 4156 4157 for (; bounds.first != bounds.second; ++bounds.first) 4158 { 4159 const char *qualified 4160 = index.symbol_name_at (bounds.first->idx, per_objfile); 4161 4162 if (!name_matcher (qualified, lookup_name_without_params, NULL) 4163 || (symbol_matcher != NULL && !symbol_matcher (qualified))) 4164 continue; 4165 4166 matches.push_back (bounds.first->idx); 4167 } 4168 } 4169 4170 std::sort (matches.begin (), matches.end ()); 4171 4172 /* Finally call the callback, once per match. */ 4173 ULONGEST prev = -1; 4174 for (offset_type idx : matches) 4175 { 4176 if (prev != idx) 4177 { 4178 if (!match_callback (idx)) 4179 break; 4180 prev = idx; 4181 } 4182 } 4183 4184 /* Above we use a type wider than idx's for 'prev', since 0 and 4185 (offset_type)-1 are both possible values. */ 4186 static_assert (sizeof (prev) > sizeof (offset_type), ""); 4187 } 4188 4189 #if GDB_SELF_TEST 4190 4191 namespace selftests { namespace dw2_expand_symtabs_matching { 4192 4193 /* A mock .gdb_index/.debug_names-like name index table, enough to 4194 exercise dw2_expand_symtabs_matching_symbol, which works with the 4195 mapped_index_base interface. Builds an index from the symbol list 4196 passed as parameter to the constructor. */ 4197 class mock_mapped_index : public mapped_index_base 4198 { 4199 public: 4200 mock_mapped_index (gdb::array_view<const char *> symbols) 4201 : m_symbol_table (symbols) 4202 {} 4203 4204 DISABLE_COPY_AND_ASSIGN (mock_mapped_index); 4205 4206 /* Return the number of names in the symbol table. */ 4207 size_t symbol_name_count () const override 4208 { 4209 return m_symbol_table.size (); 4210 } 4211 4212 /* Get the name of the symbol at IDX in the symbol table. */ 4213 const char *symbol_name_at 4214 (offset_type idx, dwarf2_per_objfile *per_objfile) const override 4215 { 4216 return m_symbol_table[idx]; 4217 } 4218 4219 private: 4220 gdb::array_view<const char *> m_symbol_table; 4221 }; 4222 4223 /* Convenience function that converts a NULL pointer to a "<null>" 4224 string, to pass to print routines. */ 4225 4226 static const char * 4227 string_or_null (const char *str) 4228 { 4229 return str != NULL ? str : "<null>"; 4230 } 4231 4232 /* Check if a lookup_name_info built from 4233 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock 4234 index. EXPECTED_LIST is the list of expected matches, in expected 4235 matching order. If no match expected, then an empty list is 4236 specified. Returns true on success. On failure prints a warning 4237 indicating the file:line that failed, and returns false. */ 4238 4239 static bool 4240 check_match (const char *file, int line, 4241 mock_mapped_index &mock_index, 4242 const char *name, symbol_name_match_type match_type, 4243 bool completion_mode, 4244 std::initializer_list<const char *> expected_list, 4245 dwarf2_per_objfile *per_objfile) 4246 { 4247 lookup_name_info lookup_name (name, match_type, completion_mode); 4248 4249 bool matched = true; 4250 4251 auto mismatch = [&] (const char *expected_str, 4252 const char *got) 4253 { 4254 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", " 4255 "expected=\"%s\", got=\"%s\"\n"), 4256 file, line, 4257 (match_type == symbol_name_match_type::FULL 4258 ? "FULL" : "WILD"), 4259 name, string_or_null (expected_str), string_or_null (got)); 4260 matched = false; 4261 }; 4262 4263 auto expected_it = expected_list.begin (); 4264 auto expected_end = expected_list.end (); 4265 4266 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name, 4267 NULL, ALL_DOMAIN, 4268 [&] (offset_type idx) 4269 { 4270 const char *matched_name = mock_index.symbol_name_at (idx, per_objfile); 4271 const char *expected_str 4272 = expected_it == expected_end ? NULL : *expected_it++; 4273 4274 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0) 4275 mismatch (expected_str, matched_name); 4276 return true; 4277 }, per_objfile); 4278 4279 const char *expected_str 4280 = expected_it == expected_end ? NULL : *expected_it++; 4281 if (expected_str != NULL) 4282 mismatch (expected_str, NULL); 4283 4284 return matched; 4285 } 4286 4287 /* The symbols added to the mock mapped_index for testing (in 4288 canonical form). */ 4289 static const char *test_symbols[] = { 4290 "function", 4291 "std::bar", 4292 "std::zfunction", 4293 "std::zfunction2", 4294 "w1::w2", 4295 "ns::foo<char*>", 4296 "ns::foo<int>", 4297 "ns::foo<long>", 4298 "ns2::tmpl<int>::foo2", 4299 "(anonymous namespace)::A::B::C", 4300 4301 /* These are used to check that the increment-last-char in the 4302 matching algorithm for completion doesn't match "t1_fund" when 4303 completing "t1_func". */ 4304 "t1_func", 4305 "t1_func1", 4306 "t1_fund", 4307 "t1_fund1", 4308 4309 /* A UTF-8 name with multi-byte sequences to make sure that 4310 cp-name-parser understands this as a single identifier ("função" 4311 is "function" in PT). */ 4312 u8"u8função", 4313 4314 /* \377 (0xff) is Latin1 'ÿ'. */ 4315 "yfunc\377", 4316 4317 /* \377 (0xff) is Latin1 'ÿ'. */ 4318 "\377", 4319 "\377\377123", 4320 4321 /* A name with all sorts of complications. Starts with "z" to make 4322 it easier for the completion tests below. */ 4323 #define Z_SYM_NAME \ 4324 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \ 4325 "::tuple<(anonymous namespace)::ui*, " \ 4326 "std::default_delete<(anonymous namespace)::ui>, void>" 4327 4328 Z_SYM_NAME 4329 }; 4330 4331 /* Returns true if the mapped_index_base::find_name_component_bounds 4332 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME, 4333 in completion mode. */ 4334 4335 static bool 4336 check_find_bounds_finds (mapped_index_base &index, 4337 const char *search_name, 4338 gdb::array_view<const char *> expected_syms, 4339 dwarf2_per_objfile *per_objfile) 4340 { 4341 lookup_name_info lookup_name (search_name, 4342 symbol_name_match_type::FULL, true); 4343 4344 auto bounds = index.find_name_components_bounds (lookup_name, 4345 language_cplus, 4346 per_objfile); 4347 4348 size_t distance = std::distance (bounds.first, bounds.second); 4349 if (distance != expected_syms.size ()) 4350 return false; 4351 4352 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++) 4353 { 4354 auto nc_elem = bounds.first + exp_elem; 4355 const char *qualified = index.symbol_name_at (nc_elem->idx, per_objfile); 4356 if (strcmp (qualified, expected_syms[exp_elem]) != 0) 4357 return false; 4358 } 4359 4360 return true; 4361 } 4362 4363 /* Test the lower-level mapped_index::find_name_component_bounds 4364 method. */ 4365 4366 static void 4367 test_mapped_index_find_name_component_bounds () 4368 { 4369 mock_mapped_index mock_index (test_symbols); 4370 4371 mock_index.build_name_components (NULL /* per_objfile */); 4372 4373 /* Test the lower-level mapped_index::find_name_component_bounds 4374 method in completion mode. */ 4375 { 4376 static const char *expected_syms[] = { 4377 "t1_func", 4378 "t1_func1", 4379 }; 4380 4381 SELF_CHECK (check_find_bounds_finds 4382 (mock_index, "t1_func", expected_syms, 4383 NULL /* per_objfile */)); 4384 } 4385 4386 /* Check that the increment-last-char in the name matching algorithm 4387 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */ 4388 { 4389 static const char *expected_syms1[] = { 4390 "\377", 4391 "\377\377123", 4392 }; 4393 SELF_CHECK (check_find_bounds_finds 4394 (mock_index, "\377", expected_syms1, NULL /* per_objfile */)); 4395 4396 static const char *expected_syms2[] = { 4397 "\377\377123", 4398 }; 4399 SELF_CHECK (check_find_bounds_finds 4400 (mock_index, "\377\377", expected_syms2, 4401 NULL /* per_objfile */)); 4402 } 4403 } 4404 4405 /* Test dw2_expand_symtabs_matching_symbol. */ 4406 4407 static void 4408 test_dw2_expand_symtabs_matching_symbol () 4409 { 4410 mock_mapped_index mock_index (test_symbols); 4411 4412 /* We let all tests run until the end even if some fails, for debug 4413 convenience. */ 4414 bool any_mismatch = false; 4415 4416 /* Create the expected symbols list (an initializer_list). Needed 4417 because lists have commas, and we need to pass them to CHECK, 4418 which is a macro. */ 4419 #define EXPECT(...) { __VA_ARGS__ } 4420 4421 /* Wrapper for check_match that passes down the current 4422 __FILE__/__LINE__. */ 4423 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \ 4424 any_mismatch |= !check_match (__FILE__, __LINE__, \ 4425 mock_index, \ 4426 NAME, MATCH_TYPE, COMPLETION_MODE, \ 4427 EXPECTED_LIST, NULL) 4428 4429 /* Identity checks. */ 4430 for (const char *sym : test_symbols) 4431 { 4432 /* Should be able to match all existing symbols. */ 4433 CHECK_MATCH (sym, symbol_name_match_type::FULL, false, 4434 EXPECT (sym)); 4435 4436 /* Should be able to match all existing symbols with 4437 parameters. */ 4438 std::string with_params = std::string (sym) + "(int)"; 4439 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false, 4440 EXPECT (sym)); 4441 4442 /* Should be able to match all existing symbols with 4443 parameters and qualifiers. */ 4444 with_params = std::string (sym) + " ( int ) const"; 4445 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false, 4446 EXPECT (sym)); 4447 4448 /* This should really find sym, but cp-name-parser.y doesn't 4449 know about lvalue/rvalue qualifiers yet. */ 4450 with_params = std::string (sym) + " ( int ) &&"; 4451 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false, 4452 {}); 4453 } 4454 4455 /* Check that the name matching algorithm for completion doesn't get 4456 confused with Latin1 'ÿ' / 0xff. */ 4457 { 4458 static const char str[] = "\377"; 4459 CHECK_MATCH (str, symbol_name_match_type::FULL, true, 4460 EXPECT ("\377", "\377\377123")); 4461 } 4462 4463 /* Check that the increment-last-char in the matching algorithm for 4464 completion doesn't match "t1_fund" when completing "t1_func". */ 4465 { 4466 static const char str[] = "t1_func"; 4467 CHECK_MATCH (str, symbol_name_match_type::FULL, true, 4468 EXPECT ("t1_func", "t1_func1")); 4469 } 4470 4471 /* Check that completion mode works at each prefix of the expected 4472 symbol name. */ 4473 { 4474 static const char str[] = "function(int)"; 4475 size_t len = strlen (str); 4476 std::string lookup; 4477 4478 for (size_t i = 1; i < len; i++) 4479 { 4480 lookup.assign (str, i); 4481 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true, 4482 EXPECT ("function")); 4483 } 4484 } 4485 4486 /* While "w" is a prefix of both components, the match function 4487 should still only be called once. */ 4488 { 4489 CHECK_MATCH ("w", symbol_name_match_type::FULL, true, 4490 EXPECT ("w1::w2")); 4491 CHECK_MATCH ("w", symbol_name_match_type::WILD, true, 4492 EXPECT ("w1::w2")); 4493 } 4494 4495 /* Same, with a "complicated" symbol. */ 4496 { 4497 static const char str[] = Z_SYM_NAME; 4498 size_t len = strlen (str); 4499 std::string lookup; 4500 4501 for (size_t i = 1; i < len; i++) 4502 { 4503 lookup.assign (str, i); 4504 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true, 4505 EXPECT (Z_SYM_NAME)); 4506 } 4507 } 4508 4509 /* In FULL mode, an incomplete symbol doesn't match. */ 4510 { 4511 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false, 4512 {}); 4513 } 4514 4515 /* A complete symbol with parameters matches any overload, since the 4516 index has no overload info. */ 4517 { 4518 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true, 4519 EXPECT ("std::zfunction", "std::zfunction2")); 4520 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true, 4521 EXPECT ("std::zfunction", "std::zfunction2")); 4522 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true, 4523 EXPECT ("std::zfunction", "std::zfunction2")); 4524 } 4525 4526 /* Check that whitespace is ignored appropriately. A symbol with a 4527 template argument list. */ 4528 { 4529 static const char expected[] = "ns::foo<int>"; 4530 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false, 4531 EXPECT (expected)); 4532 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false, 4533 EXPECT (expected)); 4534 } 4535 4536 /* Check that whitespace is ignored appropriately. A symbol with a 4537 template argument list that includes a pointer. */ 4538 { 4539 static const char expected[] = "ns::foo<char*>"; 4540 /* Try both completion and non-completion modes. */ 4541 static const bool completion_mode[2] = {false, true}; 4542 for (size_t i = 0; i < 2; i++) 4543 { 4544 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL, 4545 completion_mode[i], EXPECT (expected)); 4546 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD, 4547 completion_mode[i], EXPECT (expected)); 4548 4549 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL, 4550 completion_mode[i], EXPECT (expected)); 4551 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD, 4552 completion_mode[i], EXPECT (expected)); 4553 } 4554 } 4555 4556 { 4557 /* Check method qualifiers are ignored. */ 4558 static const char expected[] = "ns::foo<char*>"; 4559 CHECK_MATCH ("ns :: foo < char * > ( int ) const", 4560 symbol_name_match_type::FULL, true, EXPECT (expected)); 4561 CHECK_MATCH ("ns :: foo < char * > ( int ) &&", 4562 symbol_name_match_type::FULL, true, EXPECT (expected)); 4563 CHECK_MATCH ("foo < char * > ( int ) const", 4564 symbol_name_match_type::WILD, true, EXPECT (expected)); 4565 CHECK_MATCH ("foo < char * > ( int ) &&", 4566 symbol_name_match_type::WILD, true, EXPECT (expected)); 4567 } 4568 4569 /* Test lookup names that don't match anything. */ 4570 { 4571 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false, 4572 {}); 4573 4574 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false, 4575 {}); 4576 } 4577 4578 /* Some wild matching tests, exercising "(anonymous namespace)", 4579 which should not be confused with a parameter list. */ 4580 { 4581 static const char *syms[] = { 4582 "A::B::C", 4583 "B::C", 4584 "C", 4585 "A :: B :: C ( int )", 4586 "B :: C ( int )", 4587 "C ( int )", 4588 }; 4589 4590 for (const char *s : syms) 4591 { 4592 CHECK_MATCH (s, symbol_name_match_type::WILD, false, 4593 EXPECT ("(anonymous namespace)::A::B::C")); 4594 } 4595 } 4596 4597 { 4598 static const char expected[] = "ns2::tmpl<int>::foo2"; 4599 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true, 4600 EXPECT (expected)); 4601 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true, 4602 EXPECT (expected)); 4603 } 4604 4605 SELF_CHECK (!any_mismatch); 4606 4607 #undef EXPECT 4608 #undef CHECK_MATCH 4609 } 4610 4611 static void 4612 run_test () 4613 { 4614 test_mapped_index_find_name_component_bounds (); 4615 test_dw2_expand_symtabs_matching_symbol (); 4616 } 4617 4618 }} // namespace selftests::dw2_expand_symtabs_matching 4619 4620 #endif /* GDB_SELF_TEST */ 4621 4622 /* If FILE_MATCHER is NULL or if PER_CU has 4623 dwarf2_per_cu_quick_data::MARK set (see 4624 dw_expand_symtabs_matching_file_matcher), expand the CU and call 4625 EXPANSION_NOTIFY on it. */ 4626 4627 static void 4628 dw2_expand_symtabs_matching_one 4629 (dwarf2_per_cu_data *per_cu, 4630 dwarf2_per_objfile *per_objfile, 4631 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, 4632 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify) 4633 { 4634 if (file_matcher == NULL || per_cu->v.quick->mark) 4635 { 4636 bool symtab_was_null = !per_objfile->symtab_set_p (per_cu); 4637 4638 compunit_symtab *symtab 4639 = dw2_instantiate_symtab (per_cu, per_objfile, false); 4640 gdb_assert (symtab != nullptr); 4641 4642 if (expansion_notify != NULL && symtab_was_null) 4643 expansion_notify (symtab); 4644 } 4645 } 4646 4647 /* Helper for dw2_expand_matching symtabs. Called on each symbol 4648 matched, to expand corresponding CUs that were marked. IDX is the 4649 index of the symbol name that matched. */ 4650 4651 static void 4652 dw2_expand_marked_cus 4653 (dwarf2_per_objfile *per_objfile, offset_type idx, 4654 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, 4655 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify, 4656 search_domain kind) 4657 { 4658 offset_type *vec, vec_len, vec_idx; 4659 bool global_seen = false; 4660 mapped_index &index = *per_objfile->per_bfd->index_table; 4661 4662 vec = (offset_type *) (index.constant_pool 4663 + MAYBE_SWAP (index.symbol_table[idx].vec)); 4664 vec_len = MAYBE_SWAP (vec[0]); 4665 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx) 4666 { 4667 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]); 4668 /* This value is only valid for index versions >= 7. */ 4669 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs); 4670 gdb_index_symbol_kind symbol_kind = 4671 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs); 4672 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs); 4673 /* Only check the symbol attributes if they're present. 4674 Indices prior to version 7 don't record them, 4675 and indices >= 7 may elide them for certain symbols 4676 (gold does this). */ 4677 int attrs_valid = 4678 (index.version >= 7 4679 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE); 4680 4681 /* Work around gold/15646. */ 4682 if (attrs_valid 4683 && !is_static 4684 && symbol_kind == GDB_INDEX_SYMBOL_KIND_TYPE) 4685 { 4686 if (global_seen) 4687 continue; 4688 4689 global_seen = true; 4690 } 4691 4692 /* Only check the symbol's kind if it has one. */ 4693 if (attrs_valid) 4694 { 4695 switch (kind) 4696 { 4697 case VARIABLES_DOMAIN: 4698 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE) 4699 continue; 4700 break; 4701 case FUNCTIONS_DOMAIN: 4702 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION) 4703 continue; 4704 break; 4705 case TYPES_DOMAIN: 4706 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) 4707 continue; 4708 break; 4709 case MODULES_DOMAIN: 4710 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER) 4711 continue; 4712 break; 4713 default: 4714 break; 4715 } 4716 } 4717 4718 /* Don't crash on bad data. */ 4719 if (cu_index >= (per_objfile->per_bfd->all_comp_units.size () 4720 + per_objfile->per_bfd->all_type_units.size ())) 4721 { 4722 complaint (_(".gdb_index entry has bad CU index" 4723 " [in module %s]"), objfile_name (per_objfile->objfile)); 4724 continue; 4725 } 4726 4727 dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cutu (cu_index); 4728 dw2_expand_symtabs_matching_one (per_cu, per_objfile, file_matcher, 4729 expansion_notify); 4730 } 4731 } 4732 4733 /* If FILE_MATCHER is non-NULL, set all the 4734 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE 4735 that match FILE_MATCHER. */ 4736 4737 static void 4738 dw_expand_symtabs_matching_file_matcher 4739 (dwarf2_per_objfile *per_objfile, 4740 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher) 4741 { 4742 if (file_matcher == NULL) 4743 return; 4744 4745 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer, 4746 htab_eq_pointer, 4747 NULL, xcalloc, xfree)); 4748 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer, 4749 htab_eq_pointer, 4750 NULL, xcalloc, xfree)); 4751 4752 /* The rule is CUs specify all the files, including those used by 4753 any TU, so there's no need to scan TUs here. */ 4754 4755 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 4756 { 4757 QUIT; 4758 4759 per_cu->v.quick->mark = 0; 4760 4761 /* We only need to look at symtabs not already expanded. */ 4762 if (per_objfile->symtab_set_p (per_cu)) 4763 continue; 4764 4765 quick_file_names *file_data = dw2_get_file_names (per_cu, per_objfile); 4766 if (file_data == NULL) 4767 continue; 4768 4769 if (htab_find (visited_not_found.get (), file_data) != NULL) 4770 continue; 4771 else if (htab_find (visited_found.get (), file_data) != NULL) 4772 { 4773 per_cu->v.quick->mark = 1; 4774 continue; 4775 } 4776 4777 for (int j = 0; j < file_data->num_file_names; ++j) 4778 { 4779 const char *this_real_name; 4780 4781 if (file_matcher (file_data->file_names[j], false)) 4782 { 4783 per_cu->v.quick->mark = 1; 4784 break; 4785 } 4786 4787 /* Before we invoke realpath, which can get expensive when many 4788 files are involved, do a quick comparison of the basenames. */ 4789 if (!basenames_may_differ 4790 && !file_matcher (lbasename (file_data->file_names[j]), 4791 true)) 4792 continue; 4793 4794 this_real_name = dw2_get_real_path (per_objfile, file_data, j); 4795 if (file_matcher (this_real_name, false)) 4796 { 4797 per_cu->v.quick->mark = 1; 4798 break; 4799 } 4800 } 4801 4802 void **slot = htab_find_slot (per_cu->v.quick->mark 4803 ? visited_found.get () 4804 : visited_not_found.get (), 4805 file_data, INSERT); 4806 *slot = file_data; 4807 } 4808 } 4809 4810 static void 4811 dw2_expand_symtabs_matching 4812 (struct objfile *objfile, 4813 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, 4814 const lookup_name_info *lookup_name, 4815 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher, 4816 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify, 4817 enum search_domain kind) 4818 { 4819 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 4820 4821 /* index_table is NULL if OBJF_READNOW. */ 4822 if (!per_objfile->per_bfd->index_table) 4823 return; 4824 4825 dw_expand_symtabs_matching_file_matcher (per_objfile, file_matcher); 4826 4827 if (symbol_matcher == NULL && lookup_name == NULL) 4828 { 4829 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 4830 { 4831 QUIT; 4832 4833 dw2_expand_symtabs_matching_one (per_cu, per_objfile, 4834 file_matcher, expansion_notify); 4835 } 4836 return; 4837 } 4838 4839 mapped_index &index = *per_objfile->per_bfd->index_table; 4840 4841 dw2_expand_symtabs_matching_symbol (index, *lookup_name, 4842 symbol_matcher, 4843 kind, [&] (offset_type idx) 4844 { 4845 dw2_expand_marked_cus (per_objfile, idx, file_matcher, expansion_notify, 4846 kind); 4847 return true; 4848 }, per_objfile); 4849 } 4850 4851 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific 4852 symtab. */ 4853 4854 static struct compunit_symtab * 4855 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust, 4856 CORE_ADDR pc) 4857 { 4858 int i; 4859 4860 if (COMPUNIT_BLOCKVECTOR (cust) != NULL 4861 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc)) 4862 return cust; 4863 4864 if (cust->includes == NULL) 4865 return NULL; 4866 4867 for (i = 0; cust->includes[i]; ++i) 4868 { 4869 struct compunit_symtab *s = cust->includes[i]; 4870 4871 s = recursively_find_pc_sect_compunit_symtab (s, pc); 4872 if (s != NULL) 4873 return s; 4874 } 4875 4876 return NULL; 4877 } 4878 4879 static struct compunit_symtab * 4880 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile, 4881 struct bound_minimal_symbol msymbol, 4882 CORE_ADDR pc, 4883 struct obj_section *section, 4884 int warn_if_readin) 4885 { 4886 struct dwarf2_per_cu_data *data; 4887 struct compunit_symtab *result; 4888 4889 if (!objfile->partial_symtabs->psymtabs_addrmap) 4890 return NULL; 4891 4892 CORE_ADDR baseaddr = objfile->text_section_offset (); 4893 data = (struct dwarf2_per_cu_data *) addrmap_find 4894 (objfile->partial_symtabs->psymtabs_addrmap, pc - baseaddr); 4895 if (!data) 4896 return NULL; 4897 4898 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 4899 if (warn_if_readin && per_objfile->symtab_set_p (data)) 4900 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"), 4901 paddress (objfile->arch (), pc)); 4902 4903 result = recursively_find_pc_sect_compunit_symtab 4904 (dw2_instantiate_symtab (data, per_objfile, false), pc); 4905 4906 gdb_assert (result != NULL); 4907 return result; 4908 } 4909 4910 static void 4911 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun, 4912 void *data, int need_fullname) 4913 { 4914 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 4915 4916 if (!per_objfile->per_bfd->filenames_cache) 4917 { 4918 per_objfile->per_bfd->filenames_cache.emplace (); 4919 4920 htab_up visited (htab_create_alloc (10, 4921 htab_hash_pointer, htab_eq_pointer, 4922 NULL, xcalloc, xfree)); 4923 4924 /* The rule is CUs specify all the files, including those used 4925 by any TU, so there's no need to scan TUs here. We can 4926 ignore file names coming from already-expanded CUs. */ 4927 4928 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 4929 { 4930 if (per_objfile->symtab_set_p (per_cu)) 4931 { 4932 void **slot = htab_find_slot (visited.get (), 4933 per_cu->v.quick->file_names, 4934 INSERT); 4935 4936 *slot = per_cu->v.quick->file_names; 4937 } 4938 } 4939 4940 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 4941 { 4942 /* We only need to look at symtabs not already expanded. */ 4943 if (per_objfile->symtab_set_p (per_cu)) 4944 continue; 4945 4946 quick_file_names *file_data 4947 = dw2_get_file_names (per_cu, per_objfile); 4948 if (file_data == NULL) 4949 continue; 4950 4951 void **slot = htab_find_slot (visited.get (), file_data, INSERT); 4952 if (*slot) 4953 { 4954 /* Already visited. */ 4955 continue; 4956 } 4957 *slot = file_data; 4958 4959 for (int j = 0; j < file_data->num_file_names; ++j) 4960 { 4961 const char *filename = file_data->file_names[j]; 4962 per_objfile->per_bfd->filenames_cache->seen (filename); 4963 } 4964 } 4965 } 4966 4967 per_objfile->per_bfd->filenames_cache->traverse ([&] (const char *filename) 4968 { 4969 gdb::unique_xmalloc_ptr<char> this_real_name; 4970 4971 if (need_fullname) 4972 this_real_name = gdb_realpath (filename); 4973 (*fun) (filename, this_real_name.get (), data); 4974 }); 4975 } 4976 4977 static int 4978 dw2_has_symbols (struct objfile *objfile) 4979 { 4980 return 1; 4981 } 4982 4983 const struct quick_symbol_functions dwarf2_gdb_index_functions = 4984 { 4985 dw2_has_symbols, 4986 dw2_find_last_source_symtab, 4987 dw2_forget_cached_source_info, 4988 dw2_map_symtabs_matching_filename, 4989 dw2_lookup_symbol, 4990 NULL, 4991 dw2_print_stats, 4992 dw2_dump, 4993 dw2_expand_symtabs_for_function, 4994 dw2_expand_all_symtabs, 4995 dw2_expand_symtabs_with_fullname, 4996 dw2_map_matching_symbols, 4997 dw2_expand_symtabs_matching, 4998 dw2_find_pc_sect_compunit_symtab, 4999 NULL, 5000 dw2_map_symbol_filenames 5001 }; 5002 5003 /* DWARF-5 debug_names reader. */ 5004 5005 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */ 5006 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 }; 5007 5008 /* A helper function that reads the .debug_names section in SECTION 5009 and fills in MAP. FILENAME is the name of the file containing the 5010 section; it is used for error reporting. 5011 5012 Returns true if all went well, false otherwise. */ 5013 5014 static bool 5015 read_debug_names_from_section (struct objfile *objfile, 5016 const char *filename, 5017 struct dwarf2_section_info *section, 5018 mapped_debug_names &map) 5019 { 5020 if (section->empty ()) 5021 return false; 5022 5023 /* Older elfutils strip versions could keep the section in the main 5024 executable while splitting it for the separate debug info file. */ 5025 if ((section->get_flags () & SEC_HAS_CONTENTS) == 0) 5026 return false; 5027 5028 section->read (objfile); 5029 5030 map.dwarf5_byte_order = gdbarch_byte_order (objfile->arch ()); 5031 5032 const gdb_byte *addr = section->buffer; 5033 5034 bfd *const abfd = section->get_bfd_owner (); 5035 5036 unsigned int bytes_read; 5037 LONGEST length = read_initial_length (abfd, addr, &bytes_read); 5038 addr += bytes_read; 5039 5040 map.dwarf5_is_dwarf64 = bytes_read != 4; 5041 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4; 5042 if (bytes_read + length != section->size) 5043 { 5044 /* There may be multiple per-CU indices. */ 5045 warning (_("Section .debug_names in %s length %s does not match " 5046 "section length %s, ignoring .debug_names."), 5047 filename, plongest (bytes_read + length), 5048 pulongest (section->size)); 5049 return false; 5050 } 5051 5052 /* The version number. */ 5053 uint16_t version = read_2_bytes (abfd, addr); 5054 addr += 2; 5055 if (version != 5) 5056 { 5057 warning (_("Section .debug_names in %s has unsupported version %d, " 5058 "ignoring .debug_names."), 5059 filename, version); 5060 return false; 5061 } 5062 5063 /* Padding. */ 5064 uint16_t padding = read_2_bytes (abfd, addr); 5065 addr += 2; 5066 if (padding != 0) 5067 { 5068 warning (_("Section .debug_names in %s has unsupported padding %d, " 5069 "ignoring .debug_names."), 5070 filename, padding); 5071 return false; 5072 } 5073 5074 /* comp_unit_count - The number of CUs in the CU list. */ 5075 map.cu_count = read_4_bytes (abfd, addr); 5076 addr += 4; 5077 5078 /* local_type_unit_count - The number of TUs in the local TU 5079 list. */ 5080 map.tu_count = read_4_bytes (abfd, addr); 5081 addr += 4; 5082 5083 /* foreign_type_unit_count - The number of TUs in the foreign TU 5084 list. */ 5085 uint32_t foreign_tu_count = read_4_bytes (abfd, addr); 5086 addr += 4; 5087 if (foreign_tu_count != 0) 5088 { 5089 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, " 5090 "ignoring .debug_names."), 5091 filename, static_cast<unsigned long> (foreign_tu_count)); 5092 return false; 5093 } 5094 5095 /* bucket_count - The number of hash buckets in the hash lookup 5096 table. */ 5097 map.bucket_count = read_4_bytes (abfd, addr); 5098 addr += 4; 5099 5100 /* name_count - The number of unique names in the index. */ 5101 map.name_count = read_4_bytes (abfd, addr); 5102 addr += 4; 5103 5104 /* abbrev_table_size - The size in bytes of the abbreviations 5105 table. */ 5106 uint32_t abbrev_table_size = read_4_bytes (abfd, addr); 5107 addr += 4; 5108 5109 /* augmentation_string_size - The size in bytes of the augmentation 5110 string. This value is rounded up to a multiple of 4. */ 5111 uint32_t augmentation_string_size = read_4_bytes (abfd, addr); 5112 addr += 4; 5113 map.augmentation_is_gdb = ((augmentation_string_size 5114 == sizeof (dwarf5_augmentation)) 5115 && memcmp (addr, dwarf5_augmentation, 5116 sizeof (dwarf5_augmentation)) == 0); 5117 augmentation_string_size += (-augmentation_string_size) & 3; 5118 addr += augmentation_string_size; 5119 5120 /* List of CUs */ 5121 map.cu_table_reordered = addr; 5122 addr += map.cu_count * map.offset_size; 5123 5124 /* List of Local TUs */ 5125 map.tu_table_reordered = addr; 5126 addr += map.tu_count * map.offset_size; 5127 5128 /* Hash Lookup Table */ 5129 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr); 5130 addr += map.bucket_count * 4; 5131 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr); 5132 addr += map.name_count * 4; 5133 5134 /* Name Table */ 5135 map.name_table_string_offs_reordered = addr; 5136 addr += map.name_count * map.offset_size; 5137 map.name_table_entry_offs_reordered = addr; 5138 addr += map.name_count * map.offset_size; 5139 5140 const gdb_byte *abbrev_table_start = addr; 5141 for (;;) 5142 { 5143 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read); 5144 addr += bytes_read; 5145 if (index_num == 0) 5146 break; 5147 5148 const auto insertpair 5149 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ()); 5150 if (!insertpair.second) 5151 { 5152 warning (_("Section .debug_names in %s has duplicate index %s, " 5153 "ignoring .debug_names."), 5154 filename, pulongest (index_num)); 5155 return false; 5156 } 5157 mapped_debug_names::index_val &indexval = insertpair.first->second; 5158 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read); 5159 addr += bytes_read; 5160 5161 for (;;) 5162 { 5163 mapped_debug_names::index_val::attr attr; 5164 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read); 5165 addr += bytes_read; 5166 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read); 5167 addr += bytes_read; 5168 if (attr.form == DW_FORM_implicit_const) 5169 { 5170 attr.implicit_const = read_signed_leb128 (abfd, addr, 5171 &bytes_read); 5172 addr += bytes_read; 5173 } 5174 if (attr.dw_idx == 0 && attr.form == 0) 5175 break; 5176 indexval.attr_vec.push_back (std::move (attr)); 5177 } 5178 } 5179 if (addr != abbrev_table_start + abbrev_table_size) 5180 { 5181 warning (_("Section .debug_names in %s has abbreviation_table " 5182 "of size %s vs. written as %u, ignoring .debug_names."), 5183 filename, plongest (addr - abbrev_table_start), 5184 abbrev_table_size); 5185 return false; 5186 } 5187 map.entry_pool = addr; 5188 5189 return true; 5190 } 5191 5192 /* A helper for create_cus_from_debug_names that handles the MAP's CU 5193 list. */ 5194 5195 static void 5196 create_cus_from_debug_names_list (dwarf2_per_bfd *per_bfd, 5197 const mapped_debug_names &map, 5198 dwarf2_section_info §ion, 5199 bool is_dwz) 5200 { 5201 if (!map.augmentation_is_gdb) 5202 { 5203 for (uint32_t i = 0; i < map.cu_count; ++i) 5204 { 5205 sect_offset sect_off 5206 = (sect_offset) (extract_unsigned_integer 5207 (map.cu_table_reordered + i * map.offset_size, 5208 map.offset_size, 5209 map.dwarf5_byte_order)); 5210 /* We don't know the length of the CU, because the CU list in a 5211 .debug_names index can be incomplete, so we can't use the start of 5212 the next CU as end of this CU. We create the CUs here with length 0, 5213 and in cutu_reader::cutu_reader we'll fill in the actual length. */ 5214 dwarf2_per_cu_data *per_cu 5215 = create_cu_from_index_list (per_bfd, §ion, is_dwz, sect_off, 0); 5216 per_bfd->all_comp_units.push_back (per_cu); 5217 } 5218 } 5219 5220 sect_offset sect_off_prev; 5221 for (uint32_t i = 0; i <= map.cu_count; ++i) 5222 { 5223 sect_offset sect_off_next; 5224 if (i < map.cu_count) 5225 { 5226 sect_off_next 5227 = (sect_offset) (extract_unsigned_integer 5228 (map.cu_table_reordered + i * map.offset_size, 5229 map.offset_size, 5230 map.dwarf5_byte_order)); 5231 } 5232 else 5233 sect_off_next = (sect_offset) section.size; 5234 if (i >= 1) 5235 { 5236 const ULONGEST length = sect_off_next - sect_off_prev; 5237 dwarf2_per_cu_data *per_cu 5238 = create_cu_from_index_list (per_bfd, §ion, is_dwz, 5239 sect_off_prev, length); 5240 per_bfd->all_comp_units.push_back (per_cu); 5241 } 5242 sect_off_prev = sect_off_next; 5243 } 5244 } 5245 5246 /* Read the CU list from the mapped index, and use it to create all 5247 the CU objects for this dwarf2_per_objfile. */ 5248 5249 static void 5250 create_cus_from_debug_names (dwarf2_per_bfd *per_bfd, 5251 const mapped_debug_names &map, 5252 const mapped_debug_names &dwz_map) 5253 { 5254 gdb_assert (per_bfd->all_comp_units.empty ()); 5255 per_bfd->all_comp_units.reserve (map.cu_count + dwz_map.cu_count); 5256 5257 create_cus_from_debug_names_list (per_bfd, map, per_bfd->info, 5258 false /* is_dwz */); 5259 5260 if (dwz_map.cu_count == 0) 5261 return; 5262 5263 dwz_file *dwz = dwarf2_get_dwz_file (per_bfd); 5264 create_cus_from_debug_names_list (per_bfd, dwz_map, dwz->info, 5265 true /* is_dwz */); 5266 } 5267 5268 /* Read .debug_names. If everything went ok, initialize the "quick" 5269 elements of all the CUs and return true. Otherwise, return false. */ 5270 5271 static bool 5272 dwarf2_read_debug_names (dwarf2_per_objfile *per_objfile) 5273 { 5274 std::unique_ptr<mapped_debug_names> map (new mapped_debug_names); 5275 mapped_debug_names dwz_map; 5276 struct objfile *objfile = per_objfile->objfile; 5277 dwarf2_per_bfd *per_bfd = per_objfile->per_bfd; 5278 5279 if (!read_debug_names_from_section (objfile, objfile_name (objfile), 5280 &per_objfile->per_bfd->debug_names, *map)) 5281 return false; 5282 5283 /* Don't use the index if it's empty. */ 5284 if (map->name_count == 0) 5285 return false; 5286 5287 /* If there is a .dwz file, read it so we can get its CU list as 5288 well. */ 5289 dwz_file *dwz = dwarf2_get_dwz_file (per_bfd); 5290 if (dwz != NULL) 5291 { 5292 if (!read_debug_names_from_section (objfile, 5293 bfd_get_filename (dwz->dwz_bfd.get ()), 5294 &dwz->debug_names, dwz_map)) 5295 { 5296 warning (_("could not read '.debug_names' section from %s; skipping"), 5297 bfd_get_filename (dwz->dwz_bfd.get ())); 5298 return false; 5299 } 5300 } 5301 5302 create_cus_from_debug_names (per_bfd, *map, dwz_map); 5303 5304 if (map->tu_count != 0) 5305 { 5306 /* We can only handle a single .debug_types when we have an 5307 index. */ 5308 if (per_bfd->types.size () != 1) 5309 return false; 5310 5311 dwarf2_section_info *section = &per_bfd->types[0]; 5312 5313 create_signatured_type_table_from_debug_names 5314 (per_objfile, *map, section, &per_bfd->abbrev); 5315 } 5316 5317 create_addrmap_from_aranges (per_objfile, &per_bfd->debug_aranges); 5318 5319 per_bfd->debug_names_table = std::move (map); 5320 per_bfd->using_index = 1; 5321 per_bfd->quick_file_names_table = 5322 create_quick_file_names_table (per_objfile->per_bfd->all_comp_units.size ()); 5323 5324 /* Save partial symtabs in the per_bfd object, for the benefit of subsequent 5325 objfiles using the same BFD. */ 5326 gdb_assert (per_bfd->partial_symtabs == nullptr); 5327 per_bfd->partial_symtabs = objfile->partial_symtabs; 5328 5329 return true; 5330 } 5331 5332 /* Type used to manage iterating over all CUs looking for a symbol for 5333 .debug_names. */ 5334 5335 class dw2_debug_names_iterator 5336 { 5337 public: 5338 dw2_debug_names_iterator (const mapped_debug_names &map, 5339 gdb::optional<block_enum> block_index, 5340 domain_enum domain, 5341 const char *name, dwarf2_per_objfile *per_objfile) 5342 : m_map (map), m_block_index (block_index), m_domain (domain), 5343 m_addr (find_vec_in_debug_names (map, name, per_objfile)), 5344 m_per_objfile (per_objfile) 5345 {} 5346 5347 dw2_debug_names_iterator (const mapped_debug_names &map, 5348 search_domain search, uint32_t namei, dwarf2_per_objfile *per_objfile) 5349 : m_map (map), 5350 m_search (search), 5351 m_addr (find_vec_in_debug_names (map, namei, per_objfile)), 5352 m_per_objfile (per_objfile) 5353 {} 5354 5355 dw2_debug_names_iterator (const mapped_debug_names &map, 5356 block_enum block_index, domain_enum domain, 5357 uint32_t namei, dwarf2_per_objfile *per_objfile) 5358 : m_map (map), m_block_index (block_index), m_domain (domain), 5359 m_addr (find_vec_in_debug_names (map, namei, per_objfile)), 5360 m_per_objfile (per_objfile) 5361 {} 5362 5363 /* Return the next matching CU or NULL if there are no more. */ 5364 dwarf2_per_cu_data *next (); 5365 5366 private: 5367 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map, 5368 const char *name, 5369 dwarf2_per_objfile *per_objfile); 5370 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map, 5371 uint32_t namei, 5372 dwarf2_per_objfile *per_objfile); 5373 5374 /* The internalized form of .debug_names. */ 5375 const mapped_debug_names &m_map; 5376 5377 /* If set, only look for symbols that match that block. Valid values are 5378 GLOBAL_BLOCK and STATIC_BLOCK. */ 5379 const gdb::optional<block_enum> m_block_index; 5380 5381 /* The kind of symbol we're looking for. */ 5382 const domain_enum m_domain = UNDEF_DOMAIN; 5383 const search_domain m_search = ALL_DOMAIN; 5384 5385 /* The list of CUs from the index entry of the symbol, or NULL if 5386 not found. */ 5387 const gdb_byte *m_addr; 5388 5389 dwarf2_per_objfile *m_per_objfile; 5390 }; 5391 5392 const char * 5393 mapped_debug_names::namei_to_name 5394 (uint32_t namei, dwarf2_per_objfile *per_objfile) const 5395 { 5396 const ULONGEST namei_string_offs 5397 = extract_unsigned_integer ((name_table_string_offs_reordered 5398 + namei * offset_size), 5399 offset_size, 5400 dwarf5_byte_order); 5401 return read_indirect_string_at_offset (per_objfile, namei_string_offs); 5402 } 5403 5404 /* Find a slot in .debug_names for the object named NAME. If NAME is 5405 found, return pointer to its pool data. If NAME cannot be found, 5406 return NULL. */ 5407 5408 const gdb_byte * 5409 dw2_debug_names_iterator::find_vec_in_debug_names 5410 (const mapped_debug_names &map, const char *name, 5411 dwarf2_per_objfile *per_objfile) 5412 { 5413 int (*cmp) (const char *, const char *); 5414 5415 gdb::unique_xmalloc_ptr<char> without_params; 5416 if (current_language->la_language == language_cplus 5417 || current_language->la_language == language_fortran 5418 || current_language->la_language == language_d) 5419 { 5420 /* NAME is already canonical. Drop any qualifiers as 5421 .debug_names does not contain any. */ 5422 5423 if (strchr (name, '(') != NULL) 5424 { 5425 without_params = cp_remove_params (name); 5426 if (without_params != NULL) 5427 name = without_params.get (); 5428 } 5429 } 5430 5431 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp); 5432 5433 const uint32_t full_hash = dwarf5_djb_hash (name); 5434 uint32_t namei 5435 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *> 5436 (map.bucket_table_reordered 5437 + (full_hash % map.bucket_count)), 4, 5438 map.dwarf5_byte_order); 5439 if (namei == 0) 5440 return NULL; 5441 --namei; 5442 if (namei >= map.name_count) 5443 { 5444 complaint (_("Wrong .debug_names with name index %u but name_count=%u " 5445 "[in module %s]"), 5446 namei, map.name_count, 5447 objfile_name (per_objfile->objfile)); 5448 return NULL; 5449 } 5450 5451 for (;;) 5452 { 5453 const uint32_t namei_full_hash 5454 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *> 5455 (map.hash_table_reordered + namei), 4, 5456 map.dwarf5_byte_order); 5457 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count) 5458 return NULL; 5459 5460 if (full_hash == namei_full_hash) 5461 { 5462 const char *const namei_string = map.namei_to_name (namei, per_objfile); 5463 5464 #if 0 /* An expensive sanity check. */ 5465 if (namei_full_hash != dwarf5_djb_hash (namei_string)) 5466 { 5467 complaint (_("Wrong .debug_names hash for string at index %u " 5468 "[in module %s]"), 5469 namei, objfile_name (dwarf2_per_objfile->objfile)); 5470 return NULL; 5471 } 5472 #endif 5473 5474 if (cmp (namei_string, name) == 0) 5475 { 5476 const ULONGEST namei_entry_offs 5477 = extract_unsigned_integer ((map.name_table_entry_offs_reordered 5478 + namei * map.offset_size), 5479 map.offset_size, map.dwarf5_byte_order); 5480 return map.entry_pool + namei_entry_offs; 5481 } 5482 } 5483 5484 ++namei; 5485 if (namei >= map.name_count) 5486 return NULL; 5487 } 5488 } 5489 5490 const gdb_byte * 5491 dw2_debug_names_iterator::find_vec_in_debug_names 5492 (const mapped_debug_names &map, uint32_t namei, dwarf2_per_objfile *per_objfile) 5493 { 5494 if (namei >= map.name_count) 5495 { 5496 complaint (_("Wrong .debug_names with name index %u but name_count=%u " 5497 "[in module %s]"), 5498 namei, map.name_count, 5499 objfile_name (per_objfile->objfile)); 5500 return NULL; 5501 } 5502 5503 const ULONGEST namei_entry_offs 5504 = extract_unsigned_integer ((map.name_table_entry_offs_reordered 5505 + namei * map.offset_size), 5506 map.offset_size, map.dwarf5_byte_order); 5507 return map.entry_pool + namei_entry_offs; 5508 } 5509 5510 /* See dw2_debug_names_iterator. */ 5511 5512 dwarf2_per_cu_data * 5513 dw2_debug_names_iterator::next () 5514 { 5515 if (m_addr == NULL) 5516 return NULL; 5517 5518 dwarf2_per_bfd *per_bfd = m_per_objfile->per_bfd; 5519 struct objfile *objfile = m_per_objfile->objfile; 5520 bfd *const abfd = objfile->obfd; 5521 5522 again: 5523 5524 unsigned int bytes_read; 5525 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read); 5526 m_addr += bytes_read; 5527 if (abbrev == 0) 5528 return NULL; 5529 5530 const auto indexval_it = m_map.abbrev_map.find (abbrev); 5531 if (indexval_it == m_map.abbrev_map.cend ()) 5532 { 5533 complaint (_("Wrong .debug_names undefined abbrev code %s " 5534 "[in module %s]"), 5535 pulongest (abbrev), objfile_name (objfile)); 5536 return NULL; 5537 } 5538 const mapped_debug_names::index_val &indexval = indexval_it->second; 5539 enum class symbol_linkage { 5540 unknown, 5541 static_, 5542 extern_, 5543 } symbol_linkage_ = symbol_linkage::unknown; 5544 dwarf2_per_cu_data *per_cu = NULL; 5545 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec) 5546 { 5547 ULONGEST ull; 5548 switch (attr.form) 5549 { 5550 case DW_FORM_implicit_const: 5551 ull = attr.implicit_const; 5552 break; 5553 case DW_FORM_flag_present: 5554 ull = 1; 5555 break; 5556 case DW_FORM_udata: 5557 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read); 5558 m_addr += bytes_read; 5559 break; 5560 case DW_FORM_ref4: 5561 ull = read_4_bytes (abfd, m_addr); 5562 m_addr += 4; 5563 break; 5564 case DW_FORM_ref8: 5565 ull = read_8_bytes (abfd, m_addr); 5566 m_addr += 8; 5567 break; 5568 case DW_FORM_ref_sig8: 5569 ull = read_8_bytes (abfd, m_addr); 5570 m_addr += 8; 5571 break; 5572 default: 5573 complaint (_("Unsupported .debug_names form %s [in module %s]"), 5574 dwarf_form_name (attr.form), 5575 objfile_name (objfile)); 5576 return NULL; 5577 } 5578 switch (attr.dw_idx) 5579 { 5580 case DW_IDX_compile_unit: 5581 /* Don't crash on bad data. */ 5582 if (ull >= m_per_objfile->per_bfd->all_comp_units.size ()) 5583 { 5584 complaint (_(".debug_names entry has bad CU index %s" 5585 " [in module %s]"), 5586 pulongest (ull), 5587 objfile_name (objfile)); 5588 continue; 5589 } 5590 per_cu = per_bfd->get_cutu (ull); 5591 break; 5592 case DW_IDX_type_unit: 5593 /* Don't crash on bad data. */ 5594 if (ull >= per_bfd->all_type_units.size ()) 5595 { 5596 complaint (_(".debug_names entry has bad TU index %s" 5597 " [in module %s]"), 5598 pulongest (ull), 5599 objfile_name (objfile)); 5600 continue; 5601 } 5602 per_cu = &per_bfd->get_tu (ull)->per_cu; 5603 break; 5604 case DW_IDX_die_offset: 5605 /* In a per-CU index (as opposed to a per-module index), index 5606 entries without CU attribute implicitly refer to the single CU. */ 5607 if (per_cu == NULL) 5608 per_cu = per_bfd->get_cu (0); 5609 break; 5610 case DW_IDX_GNU_internal: 5611 if (!m_map.augmentation_is_gdb) 5612 break; 5613 symbol_linkage_ = symbol_linkage::static_; 5614 break; 5615 case DW_IDX_GNU_external: 5616 if (!m_map.augmentation_is_gdb) 5617 break; 5618 symbol_linkage_ = symbol_linkage::extern_; 5619 break; 5620 } 5621 } 5622 5623 /* Skip if already read in. */ 5624 if (m_per_objfile->symtab_set_p (per_cu)) 5625 goto again; 5626 5627 /* Check static vs global. */ 5628 if (symbol_linkage_ != symbol_linkage::unknown && m_block_index.has_value ()) 5629 { 5630 const bool want_static = *m_block_index == STATIC_BLOCK; 5631 const bool symbol_is_static = 5632 symbol_linkage_ == symbol_linkage::static_; 5633 if (want_static != symbol_is_static) 5634 goto again; 5635 } 5636 5637 /* Match dw2_symtab_iter_next, symbol_kind 5638 and debug_names::psymbol_tag. */ 5639 switch (m_domain) 5640 { 5641 case VAR_DOMAIN: 5642 switch (indexval.dwarf_tag) 5643 { 5644 case DW_TAG_variable: 5645 case DW_TAG_subprogram: 5646 /* Some types are also in VAR_DOMAIN. */ 5647 case DW_TAG_typedef: 5648 case DW_TAG_structure_type: 5649 break; 5650 default: 5651 goto again; 5652 } 5653 break; 5654 case STRUCT_DOMAIN: 5655 switch (indexval.dwarf_tag) 5656 { 5657 case DW_TAG_typedef: 5658 case DW_TAG_structure_type: 5659 break; 5660 default: 5661 goto again; 5662 } 5663 break; 5664 case LABEL_DOMAIN: 5665 switch (indexval.dwarf_tag) 5666 { 5667 case 0: 5668 case DW_TAG_variable: 5669 break; 5670 default: 5671 goto again; 5672 } 5673 break; 5674 case MODULE_DOMAIN: 5675 switch (indexval.dwarf_tag) 5676 { 5677 case DW_TAG_module: 5678 break; 5679 default: 5680 goto again; 5681 } 5682 break; 5683 default: 5684 break; 5685 } 5686 5687 /* Match dw2_expand_symtabs_matching, symbol_kind and 5688 debug_names::psymbol_tag. */ 5689 switch (m_search) 5690 { 5691 case VARIABLES_DOMAIN: 5692 switch (indexval.dwarf_tag) 5693 { 5694 case DW_TAG_variable: 5695 break; 5696 default: 5697 goto again; 5698 } 5699 break; 5700 case FUNCTIONS_DOMAIN: 5701 switch (indexval.dwarf_tag) 5702 { 5703 case DW_TAG_subprogram: 5704 break; 5705 default: 5706 goto again; 5707 } 5708 break; 5709 case TYPES_DOMAIN: 5710 switch (indexval.dwarf_tag) 5711 { 5712 case DW_TAG_typedef: 5713 case DW_TAG_structure_type: 5714 break; 5715 default: 5716 goto again; 5717 } 5718 break; 5719 case MODULES_DOMAIN: 5720 switch (indexval.dwarf_tag) 5721 { 5722 case DW_TAG_module: 5723 break; 5724 default: 5725 goto again; 5726 } 5727 default: 5728 break; 5729 } 5730 5731 return per_cu; 5732 } 5733 5734 static struct compunit_symtab * 5735 dw2_debug_names_lookup_symbol (struct objfile *objfile, block_enum block_index, 5736 const char *name, domain_enum domain) 5737 { 5738 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 5739 5740 const auto &mapp = per_objfile->per_bfd->debug_names_table; 5741 if (!mapp) 5742 { 5743 /* index is NULL if OBJF_READNOW. */ 5744 return NULL; 5745 } 5746 const auto &map = *mapp; 5747 5748 dw2_debug_names_iterator iter (map, block_index, domain, name, per_objfile); 5749 5750 struct compunit_symtab *stab_best = NULL; 5751 struct dwarf2_per_cu_data *per_cu; 5752 while ((per_cu = iter.next ()) != NULL) 5753 { 5754 struct symbol *sym, *with_opaque = NULL; 5755 compunit_symtab *stab 5756 = dw2_instantiate_symtab (per_cu, per_objfile, false); 5757 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab); 5758 const struct block *block = BLOCKVECTOR_BLOCK (bv, block_index); 5759 5760 sym = block_find_symbol (block, name, domain, 5761 block_find_non_opaque_type_preferred, 5762 &with_opaque); 5763 5764 /* Some caution must be observed with overloaded functions and 5765 methods, since the index will not contain any overload 5766 information (but NAME might contain it). */ 5767 5768 if (sym != NULL 5769 && strcmp_iw (sym->search_name (), name) == 0) 5770 return stab; 5771 if (with_opaque != NULL 5772 && strcmp_iw (with_opaque->search_name (), name) == 0) 5773 stab_best = stab; 5774 5775 /* Keep looking through other CUs. */ 5776 } 5777 5778 return stab_best; 5779 } 5780 5781 /* This dumps minimal information about .debug_names. It is called 5782 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase 5783 uses this to verify that .debug_names has been loaded. */ 5784 5785 static void 5786 dw2_debug_names_dump (struct objfile *objfile) 5787 { 5788 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 5789 5790 gdb_assert (per_objfile->per_bfd->using_index); 5791 printf_filtered (".debug_names:"); 5792 if (per_objfile->per_bfd->debug_names_table) 5793 printf_filtered (" exists\n"); 5794 else 5795 printf_filtered (" faked for \"readnow\"\n"); 5796 printf_filtered ("\n"); 5797 } 5798 5799 static void 5800 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile, 5801 const char *func_name) 5802 { 5803 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 5804 5805 /* per_objfile->per_bfd->debug_names_table is NULL if OBJF_READNOW. */ 5806 if (per_objfile->per_bfd->debug_names_table) 5807 { 5808 const mapped_debug_names &map = *per_objfile->per_bfd->debug_names_table; 5809 5810 dw2_debug_names_iterator iter (map, {}, VAR_DOMAIN, func_name, 5811 per_objfile); 5812 5813 struct dwarf2_per_cu_data *per_cu; 5814 while ((per_cu = iter.next ()) != NULL) 5815 dw2_instantiate_symtab (per_cu, per_objfile, false); 5816 } 5817 } 5818 5819 static void 5820 dw2_debug_names_map_matching_symbols 5821 (struct objfile *objfile, 5822 const lookup_name_info &name, domain_enum domain, 5823 int global, 5824 gdb::function_view<symbol_found_callback_ftype> callback, 5825 symbol_compare_ftype *ordered_compare) 5826 { 5827 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 5828 5829 /* debug_names_table is NULL if OBJF_READNOW. */ 5830 if (!per_objfile->per_bfd->debug_names_table) 5831 return; 5832 5833 mapped_debug_names &map = *per_objfile->per_bfd->debug_names_table; 5834 const block_enum block_kind = global ? GLOBAL_BLOCK : STATIC_BLOCK; 5835 5836 const char *match_name = name.ada ().lookup_name ().c_str (); 5837 auto matcher = [&] (const char *symname) 5838 { 5839 if (ordered_compare == nullptr) 5840 return true; 5841 return ordered_compare (symname, match_name) == 0; 5842 }; 5843 5844 dw2_expand_symtabs_matching_symbol (map, name, matcher, ALL_DOMAIN, 5845 [&] (offset_type namei) 5846 { 5847 /* The name was matched, now expand corresponding CUs that were 5848 marked. */ 5849 dw2_debug_names_iterator iter (map, block_kind, domain, namei, 5850 per_objfile); 5851 5852 struct dwarf2_per_cu_data *per_cu; 5853 while ((per_cu = iter.next ()) != NULL) 5854 dw2_expand_symtabs_matching_one (per_cu, per_objfile, nullptr, 5855 nullptr); 5856 return true; 5857 }, per_objfile); 5858 5859 /* It's a shame we couldn't do this inside the 5860 dw2_expand_symtabs_matching_symbol callback, but that skips CUs 5861 that have already been expanded. Instead, this loop matches what 5862 the psymtab code does. */ 5863 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 5864 { 5865 compunit_symtab *symtab = per_objfile->get_symtab (per_cu); 5866 if (symtab != nullptr) 5867 { 5868 const struct block *block 5869 = BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (symtab), block_kind); 5870 if (!iterate_over_symbols_terminated (block, name, 5871 domain, callback)) 5872 break; 5873 } 5874 } 5875 } 5876 5877 static void 5878 dw2_debug_names_expand_symtabs_matching 5879 (struct objfile *objfile, 5880 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, 5881 const lookup_name_info *lookup_name, 5882 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher, 5883 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify, 5884 enum search_domain kind) 5885 { 5886 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 5887 5888 /* debug_names_table is NULL if OBJF_READNOW. */ 5889 if (!per_objfile->per_bfd->debug_names_table) 5890 return; 5891 5892 dw_expand_symtabs_matching_file_matcher (per_objfile, file_matcher); 5893 5894 if (symbol_matcher == NULL && lookup_name == NULL) 5895 { 5896 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 5897 { 5898 QUIT; 5899 5900 dw2_expand_symtabs_matching_one (per_cu, per_objfile, file_matcher, 5901 expansion_notify); 5902 } 5903 return; 5904 } 5905 5906 mapped_debug_names &map = *per_objfile->per_bfd->debug_names_table; 5907 5908 dw2_expand_symtabs_matching_symbol (map, *lookup_name, 5909 symbol_matcher, 5910 kind, [&] (offset_type namei) 5911 { 5912 /* The name was matched, now expand corresponding CUs that were 5913 marked. */ 5914 dw2_debug_names_iterator iter (map, kind, namei, per_objfile); 5915 5916 struct dwarf2_per_cu_data *per_cu; 5917 while ((per_cu = iter.next ()) != NULL) 5918 dw2_expand_symtabs_matching_one (per_cu, per_objfile, file_matcher, 5919 expansion_notify); 5920 return true; 5921 }, per_objfile); 5922 } 5923 5924 const struct quick_symbol_functions dwarf2_debug_names_functions = 5925 { 5926 dw2_has_symbols, 5927 dw2_find_last_source_symtab, 5928 dw2_forget_cached_source_info, 5929 dw2_map_symtabs_matching_filename, 5930 dw2_debug_names_lookup_symbol, 5931 NULL, 5932 dw2_print_stats, 5933 dw2_debug_names_dump, 5934 dw2_debug_names_expand_symtabs_for_function, 5935 dw2_expand_all_symtabs, 5936 dw2_expand_symtabs_with_fullname, 5937 dw2_debug_names_map_matching_symbols, 5938 dw2_debug_names_expand_symtabs_matching, 5939 dw2_find_pc_sect_compunit_symtab, 5940 NULL, 5941 dw2_map_symbol_filenames 5942 }; 5943 5944 /* Get the content of the .gdb_index section of OBJ. SECTION_OWNER should point 5945 to either a dwarf2_per_bfd or dwz_file object. */ 5946 5947 template <typename T> 5948 static gdb::array_view<const gdb_byte> 5949 get_gdb_index_contents_from_section (objfile *obj, T *section_owner) 5950 { 5951 dwarf2_section_info *section = §ion_owner->gdb_index; 5952 5953 if (section->empty ()) 5954 return {}; 5955 5956 /* Older elfutils strip versions could keep the section in the main 5957 executable while splitting it for the separate debug info file. */ 5958 if ((section->get_flags () & SEC_HAS_CONTENTS) == 0) 5959 return {}; 5960 5961 section->read (obj); 5962 5963 /* dwarf2_section_info::size is a bfd_size_type, while 5964 gdb::array_view works with size_t. On 32-bit hosts, with 5965 --enable-64-bit-bfd, bfd_size_type is a 64-bit type, while size_t 5966 is 32-bit. So we need an explicit narrowing conversion here. 5967 This is fine, because it's impossible to allocate or mmap an 5968 array/buffer larger than what size_t can represent. */ 5969 return gdb::make_array_view (section->buffer, section->size); 5970 } 5971 5972 /* Lookup the index cache for the contents of the index associated to 5973 DWARF2_OBJ. */ 5974 5975 static gdb::array_view<const gdb_byte> 5976 get_gdb_index_contents_from_cache (objfile *obj, dwarf2_per_bfd *dwarf2_per_bfd) 5977 { 5978 const bfd_build_id *build_id = build_id_bfd_get (obj->obfd); 5979 if (build_id == nullptr) 5980 return {}; 5981 5982 return global_index_cache.lookup_gdb_index (build_id, 5983 &dwarf2_per_bfd->index_cache_res); 5984 } 5985 5986 /* Same as the above, but for DWZ. */ 5987 5988 static gdb::array_view<const gdb_byte> 5989 get_gdb_index_contents_from_cache_dwz (objfile *obj, dwz_file *dwz) 5990 { 5991 const bfd_build_id *build_id = build_id_bfd_get (dwz->dwz_bfd.get ()); 5992 if (build_id == nullptr) 5993 return {}; 5994 5995 return global_index_cache.lookup_gdb_index (build_id, &dwz->index_cache_res); 5996 } 5997 5998 /* See symfile.h. */ 5999 6000 bool 6001 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind) 6002 { 6003 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 6004 dwarf2_per_bfd *per_bfd = per_objfile->per_bfd; 6005 6006 /* If we're about to read full symbols, don't bother with the 6007 indices. In this case we also don't care if some other debug 6008 format is making psymtabs, because they are all about to be 6009 expanded anyway. */ 6010 if ((objfile->flags & OBJF_READNOW)) 6011 { 6012 /* When using READNOW, the using_index flag (set below) indicates that 6013 PER_BFD was already initialized, when we loaded some other objfile. */ 6014 if (per_bfd->using_index) 6015 { 6016 *index_kind = dw_index_kind::GDB_INDEX; 6017 per_objfile->resize_symtabs (); 6018 return true; 6019 } 6020 6021 per_bfd->using_index = 1; 6022 create_all_comp_units (per_objfile); 6023 create_all_type_units (per_objfile); 6024 per_bfd->quick_file_names_table 6025 = create_quick_file_names_table (per_bfd->all_comp_units.size ()); 6026 per_objfile->resize_symtabs (); 6027 6028 for (int i = 0; i < (per_bfd->all_comp_units.size () 6029 + per_bfd->all_type_units.size ()); ++i) 6030 { 6031 dwarf2_per_cu_data *per_cu = per_bfd->get_cutu (i); 6032 6033 per_cu->v.quick = OBSTACK_ZALLOC (&per_bfd->obstack, 6034 struct dwarf2_per_cu_quick_data); 6035 } 6036 6037 /* Return 1 so that gdb sees the "quick" functions. However, 6038 these functions will be no-ops because we will have expanded 6039 all symtabs. */ 6040 *index_kind = dw_index_kind::GDB_INDEX; 6041 return true; 6042 } 6043 6044 /* Was a debug names index already read when we processed an objfile sharing 6045 PER_BFD? */ 6046 if (per_bfd->debug_names_table != nullptr) 6047 { 6048 *index_kind = dw_index_kind::DEBUG_NAMES; 6049 per_objfile->objfile->partial_symtabs = per_bfd->partial_symtabs; 6050 per_objfile->resize_symtabs (); 6051 return true; 6052 } 6053 6054 /* Was a GDB index already read when we processed an objfile sharing 6055 PER_BFD? */ 6056 if (per_bfd->index_table != nullptr) 6057 { 6058 *index_kind = dw_index_kind::GDB_INDEX; 6059 per_objfile->objfile->partial_symtabs = per_bfd->partial_symtabs; 6060 per_objfile->resize_symtabs (); 6061 return true; 6062 } 6063 6064 /* There might already be partial symtabs built for this BFD. This happens 6065 when loading the same binary twice with the index-cache enabled. If so, 6066 don't try to read an index. The objfile / per_objfile initialization will 6067 be completed in dwarf2_build_psymtabs, in the standard partial symtabs 6068 code path. */ 6069 if (per_bfd->partial_symtabs != nullptr) 6070 return false; 6071 6072 if (dwarf2_read_debug_names (per_objfile)) 6073 { 6074 *index_kind = dw_index_kind::DEBUG_NAMES; 6075 per_objfile->resize_symtabs (); 6076 return true; 6077 } 6078 6079 if (dwarf2_read_gdb_index (per_objfile, 6080 get_gdb_index_contents_from_section<struct dwarf2_per_bfd>, 6081 get_gdb_index_contents_from_section<dwz_file>)) 6082 { 6083 *index_kind = dw_index_kind::GDB_INDEX; 6084 per_objfile->resize_symtabs (); 6085 return true; 6086 } 6087 6088 /* ... otherwise, try to find the index in the index cache. */ 6089 if (dwarf2_read_gdb_index (per_objfile, 6090 get_gdb_index_contents_from_cache, 6091 get_gdb_index_contents_from_cache_dwz)) 6092 { 6093 global_index_cache.hit (); 6094 *index_kind = dw_index_kind::GDB_INDEX; 6095 per_objfile->resize_symtabs (); 6096 return true; 6097 } 6098 6099 global_index_cache.miss (); 6100 return false; 6101 } 6102 6103 6104 6105 /* Build a partial symbol table. */ 6106 6107 void 6108 dwarf2_build_psymtabs (struct objfile *objfile) 6109 { 6110 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 6111 dwarf2_per_bfd *per_bfd = per_objfile->per_bfd; 6112 6113 if (per_bfd->partial_symtabs != nullptr) 6114 { 6115 /* Partial symbols were already read, so now we can simply 6116 attach them. */ 6117 objfile->partial_symtabs = per_bfd->partial_symtabs; 6118 per_objfile->resize_symtabs (); 6119 return; 6120 } 6121 6122 init_psymbol_list (objfile, 1024); 6123 6124 try 6125 { 6126 /* This isn't really ideal: all the data we allocate on the 6127 objfile's obstack is still uselessly kept around. However, 6128 freeing it seems unsafe. */ 6129 psymtab_discarder psymtabs (objfile); 6130 dwarf2_build_psymtabs_hard (per_objfile); 6131 psymtabs.keep (); 6132 6133 per_objfile->resize_symtabs (); 6134 6135 /* (maybe) store an index in the cache. */ 6136 global_index_cache.store (per_objfile); 6137 } 6138 catch (const gdb_exception_error &except) 6139 { 6140 exception_print (gdb_stderr, except); 6141 } 6142 6143 /* Finish by setting the local reference to partial symtabs, so that 6144 we don't try to read them again if reading another objfile with the same 6145 BFD. If we can't in fact share, this won't make a difference anyway as 6146 the dwarf2_per_bfd object won't be shared. */ 6147 per_bfd->partial_symtabs = objfile->partial_symtabs; 6148 } 6149 6150 /* Find the base address of the compilation unit for range lists and 6151 location lists. It will normally be specified by DW_AT_low_pc. 6152 In DWARF-3 draft 4, the base address could be overridden by 6153 DW_AT_entry_pc. It's been removed, but GCC still uses this for 6154 compilation units with discontinuous ranges. */ 6155 6156 static void 6157 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu) 6158 { 6159 struct attribute *attr; 6160 6161 cu->base_address.reset (); 6162 6163 attr = dwarf2_attr (die, DW_AT_entry_pc, cu); 6164 if (attr != nullptr) 6165 cu->base_address = attr->value_as_address (); 6166 else 6167 { 6168 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 6169 if (attr != nullptr) 6170 cu->base_address = attr->value_as_address (); 6171 } 6172 } 6173 6174 /* Helper function that returns the proper abbrev section for 6175 THIS_CU. */ 6176 6177 static struct dwarf2_section_info * 6178 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu) 6179 { 6180 struct dwarf2_section_info *abbrev; 6181 dwarf2_per_bfd *per_bfd = this_cu->per_bfd; 6182 6183 if (this_cu->is_dwz) 6184 abbrev = &dwarf2_get_dwz_file (per_bfd)->abbrev; 6185 else 6186 abbrev = &per_bfd->abbrev; 6187 6188 return abbrev; 6189 } 6190 6191 /* Fetch the abbreviation table offset from a comp or type unit header. */ 6192 6193 static sect_offset 6194 read_abbrev_offset (dwarf2_per_objfile *per_objfile, 6195 struct dwarf2_section_info *section, 6196 sect_offset sect_off) 6197 { 6198 bfd *abfd = section->get_bfd_owner (); 6199 const gdb_byte *info_ptr; 6200 unsigned int initial_length_size, offset_size; 6201 uint16_t version; 6202 6203 section->read (per_objfile->objfile); 6204 info_ptr = section->buffer + to_underlying (sect_off); 6205 read_initial_length (abfd, info_ptr, &initial_length_size); 6206 offset_size = initial_length_size == 4 ? 4 : 8; 6207 info_ptr += initial_length_size; 6208 6209 version = read_2_bytes (abfd, info_ptr); 6210 info_ptr += 2; 6211 if (version >= 5) 6212 { 6213 /* Skip unit type and address size. */ 6214 info_ptr += 2; 6215 } 6216 6217 return (sect_offset) read_offset (abfd, info_ptr, offset_size); 6218 } 6219 6220 /* A partial symtab that is used only for include files. */ 6221 struct dwarf2_include_psymtab : public partial_symtab 6222 { 6223 dwarf2_include_psymtab (const char *filename, struct objfile *objfile) 6224 : partial_symtab (filename, objfile) 6225 { 6226 } 6227 6228 void read_symtab (struct objfile *objfile) override 6229 { 6230 /* It's an include file, no symbols to read for it. 6231 Everything is in the includer symtab. */ 6232 6233 /* The expansion of a dwarf2_include_psymtab is just a trigger for 6234 expansion of the includer psymtab. We use the dependencies[0] field to 6235 model the includer. But if we go the regular route of calling 6236 expand_psymtab here, and having expand_psymtab call expand_dependencies 6237 to expand the includer, we'll only use expand_psymtab on the includer 6238 (making it a non-toplevel psymtab), while if we expand the includer via 6239 another path, we'll use read_symtab (making it a toplevel psymtab). 6240 So, don't pretend a dwarf2_include_psymtab is an actual toplevel 6241 psymtab, and trigger read_symtab on the includer here directly. */ 6242 includer ()->read_symtab (objfile); 6243 } 6244 6245 void expand_psymtab (struct objfile *objfile) override 6246 { 6247 /* This is not called by read_symtab, and should not be called by any 6248 expand_dependencies. */ 6249 gdb_assert (false); 6250 } 6251 6252 bool readin_p (struct objfile *objfile) const override 6253 { 6254 return includer ()->readin_p (objfile); 6255 } 6256 6257 compunit_symtab *get_compunit_symtab (struct objfile *objfile) const override 6258 { 6259 return nullptr; 6260 } 6261 6262 private: 6263 partial_symtab *includer () const 6264 { 6265 /* An include psymtab has exactly one dependency: the psymtab that 6266 includes it. */ 6267 gdb_assert (this->number_of_dependencies == 1); 6268 return this->dependencies[0]; 6269 } 6270 }; 6271 6272 /* Allocate a new partial symtab for file named NAME and mark this new 6273 partial symtab as being an include of PST. */ 6274 6275 static void 6276 dwarf2_create_include_psymtab (const char *name, dwarf2_psymtab *pst, 6277 struct objfile *objfile) 6278 { 6279 dwarf2_include_psymtab *subpst = new dwarf2_include_psymtab (name, objfile); 6280 6281 if (!IS_ABSOLUTE_PATH (subpst->filename)) 6282 subpst->dirname = pst->dirname; 6283 6284 subpst->dependencies = objfile->partial_symtabs->allocate_dependencies (1); 6285 subpst->dependencies[0] = pst; 6286 subpst->number_of_dependencies = 1; 6287 } 6288 6289 /* Read the Line Number Program data and extract the list of files 6290 included by the source file represented by PST. Build an include 6291 partial symtab for each of these included files. */ 6292 6293 static void 6294 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu, 6295 struct die_info *die, 6296 dwarf2_psymtab *pst) 6297 { 6298 line_header_up lh; 6299 struct attribute *attr; 6300 6301 attr = dwarf2_attr (die, DW_AT_stmt_list, cu); 6302 if (attr != nullptr) 6303 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu); 6304 if (lh == NULL) 6305 return; /* No linetable, so no includes. */ 6306 6307 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). Also note 6308 that we pass in the raw text_low here; that is ok because we're 6309 only decoding the line table to make include partial symtabs, and 6310 so the addresses aren't really used. */ 6311 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, 6312 pst->raw_text_low (), 1); 6313 } 6314 6315 static hashval_t 6316 hash_signatured_type (const void *item) 6317 { 6318 const struct signatured_type *sig_type 6319 = (const struct signatured_type *) item; 6320 6321 /* This drops the top 32 bits of the signature, but is ok for a hash. */ 6322 return sig_type->signature; 6323 } 6324 6325 static int 6326 eq_signatured_type (const void *item_lhs, const void *item_rhs) 6327 { 6328 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs; 6329 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs; 6330 6331 return lhs->signature == rhs->signature; 6332 } 6333 6334 /* Allocate a hash table for signatured types. */ 6335 6336 static htab_up 6337 allocate_signatured_type_table () 6338 { 6339 return htab_up (htab_create_alloc (41, 6340 hash_signatured_type, 6341 eq_signatured_type, 6342 NULL, xcalloc, xfree)); 6343 } 6344 6345 /* A helper function to add a signatured type CU to a table. */ 6346 6347 static int 6348 add_signatured_type_cu_to_table (void **slot, void *datum) 6349 { 6350 struct signatured_type *sigt = (struct signatured_type *) *slot; 6351 std::vector<signatured_type *> *all_type_units 6352 = (std::vector<signatured_type *> *) datum; 6353 6354 all_type_units->push_back (sigt); 6355 6356 return 1; 6357 } 6358 6359 /* A helper for create_debug_types_hash_table. Read types from SECTION 6360 and fill them into TYPES_HTAB. It will process only type units, 6361 therefore DW_UT_type. */ 6362 6363 static void 6364 create_debug_type_hash_table (dwarf2_per_objfile *per_objfile, 6365 struct dwo_file *dwo_file, 6366 dwarf2_section_info *section, htab_up &types_htab, 6367 rcuh_kind section_kind) 6368 { 6369 struct objfile *objfile = per_objfile->objfile; 6370 struct dwarf2_section_info *abbrev_section; 6371 bfd *abfd; 6372 const gdb_byte *info_ptr, *end_ptr; 6373 6374 abbrev_section = (dwo_file != NULL 6375 ? &dwo_file->sections.abbrev 6376 : &per_objfile->per_bfd->abbrev); 6377 6378 if (dwarf_read_debug) 6379 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n", 6380 section->get_name (), 6381 abbrev_section->get_file_name ()); 6382 6383 section->read (objfile); 6384 info_ptr = section->buffer; 6385 6386 if (info_ptr == NULL) 6387 return; 6388 6389 /* We can't set abfd until now because the section may be empty or 6390 not present, in which case the bfd is unknown. */ 6391 abfd = section->get_bfd_owner (); 6392 6393 /* We don't use cutu_reader here because we don't need to read 6394 any dies: the signature is in the header. */ 6395 6396 end_ptr = info_ptr + section->size; 6397 while (info_ptr < end_ptr) 6398 { 6399 struct signatured_type *sig_type; 6400 struct dwo_unit *dwo_tu; 6401 void **slot; 6402 const gdb_byte *ptr = info_ptr; 6403 struct comp_unit_head header; 6404 unsigned int length; 6405 6406 sect_offset sect_off = (sect_offset) (ptr - section->buffer); 6407 6408 /* Initialize it due to a false compiler warning. */ 6409 header.signature = -1; 6410 header.type_cu_offset_in_tu = (cu_offset) -1; 6411 6412 /* We need to read the type's signature in order to build the hash 6413 table, but we don't need anything else just yet. */ 6414 6415 ptr = read_and_check_comp_unit_head (per_objfile, &header, section, 6416 abbrev_section, ptr, section_kind); 6417 6418 length = header.get_length (); 6419 6420 /* Skip dummy type units. */ 6421 if (ptr >= info_ptr + length 6422 || peek_abbrev_code (abfd, ptr) == 0 6423 || (header.unit_type != DW_UT_type 6424 && header.unit_type != DW_UT_split_type)) 6425 { 6426 info_ptr += length; 6427 continue; 6428 } 6429 6430 if (types_htab == NULL) 6431 { 6432 if (dwo_file) 6433 types_htab = allocate_dwo_unit_table (); 6434 else 6435 types_htab = allocate_signatured_type_table (); 6436 } 6437 6438 if (dwo_file) 6439 { 6440 sig_type = NULL; 6441 dwo_tu = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, dwo_unit); 6442 dwo_tu->dwo_file = dwo_file; 6443 dwo_tu->signature = header.signature; 6444 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu; 6445 dwo_tu->section = section; 6446 dwo_tu->sect_off = sect_off; 6447 dwo_tu->length = length; 6448 } 6449 else 6450 { 6451 /* N.B.: type_offset is not usable if this type uses a DWO file. 6452 The real type_offset is in the DWO file. */ 6453 dwo_tu = NULL; 6454 sig_type = per_objfile->per_bfd->allocate_signatured_type (); 6455 sig_type->signature = header.signature; 6456 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu; 6457 sig_type->per_cu.is_debug_types = 1; 6458 sig_type->per_cu.section = section; 6459 sig_type->per_cu.sect_off = sect_off; 6460 sig_type->per_cu.length = length; 6461 } 6462 6463 slot = htab_find_slot (types_htab.get (), 6464 dwo_file ? (void*) dwo_tu : (void *) sig_type, 6465 INSERT); 6466 gdb_assert (slot != NULL); 6467 if (*slot != NULL) 6468 { 6469 sect_offset dup_sect_off; 6470 6471 if (dwo_file) 6472 { 6473 const struct dwo_unit *dup_tu 6474 = (const struct dwo_unit *) *slot; 6475 6476 dup_sect_off = dup_tu->sect_off; 6477 } 6478 else 6479 { 6480 const struct signatured_type *dup_tu 6481 = (const struct signatured_type *) *slot; 6482 6483 dup_sect_off = dup_tu->per_cu.sect_off; 6484 } 6485 6486 complaint (_("debug type entry at offset %s is duplicate to" 6487 " the entry at offset %s, signature %s"), 6488 sect_offset_str (sect_off), sect_offset_str (dup_sect_off), 6489 hex_string (header.signature)); 6490 } 6491 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type; 6492 6493 if (dwarf_read_debug > 1) 6494 fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n", 6495 sect_offset_str (sect_off), 6496 hex_string (header.signature)); 6497 6498 info_ptr += length; 6499 } 6500 } 6501 6502 /* Create the hash table of all entries in the .debug_types 6503 (or .debug_types.dwo) section(s). 6504 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object, 6505 otherwise it is NULL. 6506 6507 The result is a pointer to the hash table or NULL if there are no types. 6508 6509 Note: This function processes DWO files only, not DWP files. */ 6510 6511 static void 6512 create_debug_types_hash_table (dwarf2_per_objfile *per_objfile, 6513 struct dwo_file *dwo_file, 6514 gdb::array_view<dwarf2_section_info> type_sections, 6515 htab_up &types_htab) 6516 { 6517 for (dwarf2_section_info §ion : type_sections) 6518 create_debug_type_hash_table (per_objfile, dwo_file, §ion, types_htab, 6519 rcuh_kind::TYPE); 6520 } 6521 6522 /* Create the hash table of all entries in the .debug_types section, 6523 and initialize all_type_units. 6524 The result is zero if there is an error (e.g. missing .debug_types section), 6525 otherwise non-zero. */ 6526 6527 static int 6528 create_all_type_units (dwarf2_per_objfile *per_objfile) 6529 { 6530 htab_up types_htab; 6531 6532 create_debug_type_hash_table (per_objfile, NULL, &per_objfile->per_bfd->info, 6533 types_htab, rcuh_kind::COMPILE); 6534 create_debug_types_hash_table (per_objfile, NULL, per_objfile->per_bfd->types, 6535 types_htab); 6536 if (types_htab == NULL) 6537 { 6538 per_objfile->per_bfd->signatured_types = NULL; 6539 return 0; 6540 } 6541 6542 per_objfile->per_bfd->signatured_types = std::move (types_htab); 6543 6544 gdb_assert (per_objfile->per_bfd->all_type_units.empty ()); 6545 per_objfile->per_bfd->all_type_units.reserve 6546 (htab_elements (per_objfile->per_bfd->signatured_types.get ())); 6547 6548 htab_traverse_noresize (per_objfile->per_bfd->signatured_types.get (), 6549 add_signatured_type_cu_to_table, 6550 &per_objfile->per_bfd->all_type_units); 6551 6552 return 1; 6553 } 6554 6555 /* Add an entry for signature SIG to dwarf2_per_objfile->per_bfd->signatured_types. 6556 If SLOT is non-NULL, it is the entry to use in the hash table. 6557 Otherwise we find one. */ 6558 6559 static struct signatured_type * 6560 add_type_unit (dwarf2_per_objfile *per_objfile, ULONGEST sig, void **slot) 6561 { 6562 if (per_objfile->per_bfd->all_type_units.size () 6563 == per_objfile->per_bfd->all_type_units.capacity ()) 6564 ++per_objfile->per_bfd->tu_stats.nr_all_type_units_reallocs; 6565 6566 signatured_type *sig_type = per_objfile->per_bfd->allocate_signatured_type (); 6567 6568 per_objfile->resize_symtabs (); 6569 6570 per_objfile->per_bfd->all_type_units.push_back (sig_type); 6571 sig_type->signature = sig; 6572 sig_type->per_cu.is_debug_types = 1; 6573 if (per_objfile->per_bfd->using_index) 6574 { 6575 sig_type->per_cu.v.quick = 6576 OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, 6577 struct dwarf2_per_cu_quick_data); 6578 } 6579 6580 if (slot == NULL) 6581 { 6582 slot = htab_find_slot (per_objfile->per_bfd->signatured_types.get (), 6583 sig_type, INSERT); 6584 } 6585 gdb_assert (*slot == NULL); 6586 *slot = sig_type; 6587 /* The rest of sig_type must be filled in by the caller. */ 6588 return sig_type; 6589 } 6590 6591 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type. 6592 Fill in SIG_ENTRY with DWO_ENTRY. */ 6593 6594 static void 6595 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile *per_objfile, 6596 struct signatured_type *sig_entry, 6597 struct dwo_unit *dwo_entry) 6598 { 6599 dwarf2_per_bfd *per_bfd = per_objfile->per_bfd; 6600 6601 /* Make sure we're not clobbering something we don't expect to. */ 6602 gdb_assert (! sig_entry->per_cu.queued); 6603 gdb_assert (per_objfile->get_cu (&sig_entry->per_cu) == NULL); 6604 if (per_bfd->using_index) 6605 { 6606 gdb_assert (sig_entry->per_cu.v.quick != NULL); 6607 gdb_assert (!per_objfile->symtab_set_p (&sig_entry->per_cu)); 6608 } 6609 else 6610 gdb_assert (sig_entry->per_cu.v.psymtab == NULL); 6611 gdb_assert (sig_entry->signature == dwo_entry->signature); 6612 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0); 6613 gdb_assert (sig_entry->type_unit_group == NULL); 6614 gdb_assert (sig_entry->dwo_unit == NULL); 6615 6616 sig_entry->per_cu.section = dwo_entry->section; 6617 sig_entry->per_cu.sect_off = dwo_entry->sect_off; 6618 sig_entry->per_cu.length = dwo_entry->length; 6619 sig_entry->per_cu.reading_dwo_directly = 1; 6620 sig_entry->per_cu.per_bfd = per_bfd; 6621 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu; 6622 sig_entry->dwo_unit = dwo_entry; 6623 } 6624 6625 /* Subroutine of lookup_signatured_type. 6626 If we haven't read the TU yet, create the signatured_type data structure 6627 for a TU to be read in directly from a DWO file, bypassing the stub. 6628 This is the "Stay in DWO Optimization": When there is no DWP file and we're 6629 using .gdb_index, then when reading a CU we want to stay in the DWO file 6630 containing that CU. Otherwise we could end up reading several other DWO 6631 files (due to comdat folding) to process the transitive closure of all the 6632 mentioned TUs, and that can be slow. The current DWO file will have every 6633 type signature that it needs. 6634 We only do this for .gdb_index because in the psymtab case we already have 6635 to read all the DWOs to build the type unit groups. */ 6636 6637 static struct signatured_type * 6638 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig) 6639 { 6640 dwarf2_per_objfile *per_objfile = cu->per_objfile; 6641 struct dwo_file *dwo_file; 6642 struct dwo_unit find_dwo_entry, *dwo_entry; 6643 struct signatured_type find_sig_entry, *sig_entry; 6644 void **slot; 6645 6646 gdb_assert (cu->dwo_unit && per_objfile->per_bfd->using_index); 6647 6648 /* If TU skeletons have been removed then we may not have read in any 6649 TUs yet. */ 6650 if (per_objfile->per_bfd->signatured_types == NULL) 6651 per_objfile->per_bfd->signatured_types = allocate_signatured_type_table (); 6652 6653 /* We only ever need to read in one copy of a signatured type. 6654 Use the global signatured_types array to do our own comdat-folding 6655 of types. If this is the first time we're reading this TU, and 6656 the TU has an entry in .gdb_index, replace the recorded data from 6657 .gdb_index with this TU. */ 6658 6659 find_sig_entry.signature = sig; 6660 slot = htab_find_slot (per_objfile->per_bfd->signatured_types.get (), 6661 &find_sig_entry, INSERT); 6662 sig_entry = (struct signatured_type *) *slot; 6663 6664 /* We can get here with the TU already read, *or* in the process of being 6665 read. Don't reassign the global entry to point to this DWO if that's 6666 the case. Also note that if the TU is already being read, it may not 6667 have come from a DWO, the program may be a mix of Fission-compiled 6668 code and non-Fission-compiled code. */ 6669 6670 /* Have we already tried to read this TU? 6671 Note: sig_entry can be NULL if the skeleton TU was removed (thus it 6672 needn't exist in the global table yet). */ 6673 if (sig_entry != NULL && sig_entry->per_cu.tu_read) 6674 return sig_entry; 6675 6676 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the 6677 dwo_unit of the TU itself. */ 6678 dwo_file = cu->dwo_unit->dwo_file; 6679 6680 /* Ok, this is the first time we're reading this TU. */ 6681 if (dwo_file->tus == NULL) 6682 return NULL; 6683 find_dwo_entry.signature = sig; 6684 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus.get (), 6685 &find_dwo_entry); 6686 if (dwo_entry == NULL) 6687 return NULL; 6688 6689 /* If the global table doesn't have an entry for this TU, add one. */ 6690 if (sig_entry == NULL) 6691 sig_entry = add_type_unit (per_objfile, sig, slot); 6692 6693 fill_in_sig_entry_from_dwo_entry (per_objfile, sig_entry, dwo_entry); 6694 sig_entry->per_cu.tu_read = 1; 6695 return sig_entry; 6696 } 6697 6698 /* Subroutine of lookup_signatured_type. 6699 Look up the type for signature SIG, and if we can't find SIG in .gdb_index 6700 then try the DWP file. If the TU stub (skeleton) has been removed then 6701 it won't be in .gdb_index. */ 6702 6703 static struct signatured_type * 6704 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig) 6705 { 6706 dwarf2_per_objfile *per_objfile = cu->per_objfile; 6707 struct dwp_file *dwp_file = get_dwp_file (per_objfile); 6708 struct dwo_unit *dwo_entry; 6709 struct signatured_type find_sig_entry, *sig_entry; 6710 void **slot; 6711 6712 gdb_assert (cu->dwo_unit && per_objfile->per_bfd->using_index); 6713 gdb_assert (dwp_file != NULL); 6714 6715 /* If TU skeletons have been removed then we may not have read in any 6716 TUs yet. */ 6717 if (per_objfile->per_bfd->signatured_types == NULL) 6718 per_objfile->per_bfd->signatured_types = allocate_signatured_type_table (); 6719 6720 find_sig_entry.signature = sig; 6721 slot = htab_find_slot (per_objfile->per_bfd->signatured_types.get (), 6722 &find_sig_entry, INSERT); 6723 sig_entry = (struct signatured_type *) *slot; 6724 6725 /* Have we already tried to read this TU? 6726 Note: sig_entry can be NULL if the skeleton TU was removed (thus it 6727 needn't exist in the global table yet). */ 6728 if (sig_entry != NULL) 6729 return sig_entry; 6730 6731 if (dwp_file->tus == NULL) 6732 return NULL; 6733 dwo_entry = lookup_dwo_unit_in_dwp (per_objfile, dwp_file, NULL, sig, 6734 1 /* is_debug_types */); 6735 if (dwo_entry == NULL) 6736 return NULL; 6737 6738 sig_entry = add_type_unit (per_objfile, sig, slot); 6739 fill_in_sig_entry_from_dwo_entry (per_objfile, sig_entry, dwo_entry); 6740 6741 return sig_entry; 6742 } 6743 6744 /* Lookup a signature based type for DW_FORM_ref_sig8. 6745 Returns NULL if signature SIG is not present in the table. 6746 It is up to the caller to complain about this. */ 6747 6748 static struct signatured_type * 6749 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig) 6750 { 6751 dwarf2_per_objfile *per_objfile = cu->per_objfile; 6752 6753 if (cu->dwo_unit && per_objfile->per_bfd->using_index) 6754 { 6755 /* We're in a DWO/DWP file, and we're using .gdb_index. 6756 These cases require special processing. */ 6757 if (get_dwp_file (per_objfile) == NULL) 6758 return lookup_dwo_signatured_type (cu, sig); 6759 else 6760 return lookup_dwp_signatured_type (cu, sig); 6761 } 6762 else 6763 { 6764 struct signatured_type find_entry, *entry; 6765 6766 if (per_objfile->per_bfd->signatured_types == NULL) 6767 return NULL; 6768 find_entry.signature = sig; 6769 entry = ((struct signatured_type *) 6770 htab_find (per_objfile->per_bfd->signatured_types.get (), 6771 &find_entry)); 6772 return entry; 6773 } 6774 } 6775 6776 /* Low level DIE reading support. */ 6777 6778 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */ 6779 6780 static void 6781 init_cu_die_reader (struct die_reader_specs *reader, 6782 struct dwarf2_cu *cu, 6783 struct dwarf2_section_info *section, 6784 struct dwo_file *dwo_file, 6785 struct abbrev_table *abbrev_table) 6786 { 6787 gdb_assert (section->readin && section->buffer != NULL); 6788 reader->abfd = section->get_bfd_owner (); 6789 reader->cu = cu; 6790 reader->dwo_file = dwo_file; 6791 reader->die_section = section; 6792 reader->buffer = section->buffer; 6793 reader->buffer_end = section->buffer + section->size; 6794 reader->abbrev_table = abbrev_table; 6795 } 6796 6797 /* Subroutine of cutu_reader to simplify it. 6798 Read in the rest of a CU/TU top level DIE from DWO_UNIT. 6799 There's just a lot of work to do, and cutu_reader is big enough 6800 already. 6801 6802 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes 6803 from it to the DIE in the DWO. If NULL we are skipping the stub. 6804 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly 6805 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir 6806 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and 6807 STUB_COMP_DIR may be non-NULL. 6808 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE 6809 are filled in with the info of the DIE from the DWO file. 6810 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated 6811 from the dwo. Since *RESULT_READER references this abbrev table, it must be 6812 kept around for at least as long as *RESULT_READER. 6813 6814 The result is non-zero if a valid (non-dummy) DIE was found. */ 6815 6816 static int 6817 read_cutu_die_from_dwo (dwarf2_cu *cu, 6818 struct dwo_unit *dwo_unit, 6819 struct die_info *stub_comp_unit_die, 6820 const char *stub_comp_dir, 6821 struct die_reader_specs *result_reader, 6822 const gdb_byte **result_info_ptr, 6823 struct die_info **result_comp_unit_die, 6824 abbrev_table_up *result_dwo_abbrev_table) 6825 { 6826 dwarf2_per_objfile *per_objfile = cu->per_objfile; 6827 dwarf2_per_cu_data *per_cu = cu->per_cu; 6828 struct objfile *objfile = per_objfile->objfile; 6829 bfd *abfd; 6830 const gdb_byte *begin_info_ptr, *info_ptr; 6831 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges; 6832 int i,num_extra_attrs; 6833 struct dwarf2_section_info *dwo_abbrev_section; 6834 struct die_info *comp_unit_die; 6835 6836 /* At most one of these may be provided. */ 6837 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1); 6838 6839 /* These attributes aren't processed until later: 6840 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges. 6841 DW_AT_comp_dir is used now, to find the DWO file, but it is also 6842 referenced later. However, these attributes are found in the stub 6843 which we won't have later. In order to not impose this complication 6844 on the rest of the code, we read them here and copy them to the 6845 DWO CU/TU die. */ 6846 6847 stmt_list = NULL; 6848 low_pc = NULL; 6849 high_pc = NULL; 6850 ranges = NULL; 6851 comp_dir = NULL; 6852 6853 if (stub_comp_unit_die != NULL) 6854 { 6855 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the 6856 DWO file. */ 6857 if (!per_cu->is_debug_types) 6858 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu); 6859 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu); 6860 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu); 6861 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu); 6862 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu); 6863 6864 cu->addr_base = stub_comp_unit_die->addr_base (); 6865 6866 /* There should be a DW_AT_rnglists_base (DW_AT_GNU_ranges_base) attribute 6867 here (if needed). We need the value before we can process 6868 DW_AT_ranges. */ 6869 cu->ranges_base = stub_comp_unit_die->ranges_base (); 6870 } 6871 else if (stub_comp_dir != NULL) 6872 { 6873 /* Reconstruct the comp_dir attribute to simplify the code below. */ 6874 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute); 6875 comp_dir->name = DW_AT_comp_dir; 6876 comp_dir->form = DW_FORM_string; 6877 DW_STRING_IS_CANONICAL (comp_dir) = 0; 6878 DW_STRING (comp_dir) = stub_comp_dir; 6879 } 6880 6881 /* Set up for reading the DWO CU/TU. */ 6882 cu->dwo_unit = dwo_unit; 6883 dwarf2_section_info *section = dwo_unit->section; 6884 section->read (objfile); 6885 abfd = section->get_bfd_owner (); 6886 begin_info_ptr = info_ptr = (section->buffer 6887 + to_underlying (dwo_unit->sect_off)); 6888 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev; 6889 6890 if (per_cu->is_debug_types) 6891 { 6892 signatured_type *sig_type = (struct signatured_type *) per_cu; 6893 6894 info_ptr = read_and_check_comp_unit_head (per_objfile, &cu->header, 6895 section, dwo_abbrev_section, 6896 info_ptr, rcuh_kind::TYPE); 6897 /* This is not an assert because it can be caused by bad debug info. */ 6898 if (sig_type->signature != cu->header.signature) 6899 { 6900 error (_("Dwarf Error: signature mismatch %s vs %s while reading" 6901 " TU at offset %s [in module %s]"), 6902 hex_string (sig_type->signature), 6903 hex_string (cu->header.signature), 6904 sect_offset_str (dwo_unit->sect_off), 6905 bfd_get_filename (abfd)); 6906 } 6907 gdb_assert (dwo_unit->sect_off == cu->header.sect_off); 6908 /* For DWOs coming from DWP files, we don't know the CU length 6909 nor the type's offset in the TU until now. */ 6910 dwo_unit->length = cu->header.get_length (); 6911 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu; 6912 6913 /* Establish the type offset that can be used to lookup the type. 6914 For DWO files, we don't know it until now. */ 6915 sig_type->type_offset_in_section 6916 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu); 6917 } 6918 else 6919 { 6920 info_ptr = read_and_check_comp_unit_head (per_objfile, &cu->header, 6921 section, dwo_abbrev_section, 6922 info_ptr, rcuh_kind::COMPILE); 6923 gdb_assert (dwo_unit->sect_off == cu->header.sect_off); 6924 /* For DWOs coming from DWP files, we don't know the CU length 6925 until now. */ 6926 dwo_unit->length = cu->header.get_length (); 6927 } 6928 6929 *result_dwo_abbrev_table 6930 = abbrev_table::read (objfile, dwo_abbrev_section, 6931 cu->header.abbrev_sect_off); 6932 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file, 6933 result_dwo_abbrev_table->get ()); 6934 6935 /* Read in the die, but leave space to copy over the attributes 6936 from the stub. This has the benefit of simplifying the rest of 6937 the code - all the work to maintain the illusion of a single 6938 DW_TAG_{compile,type}_unit DIE is done here. */ 6939 num_extra_attrs = ((stmt_list != NULL) 6940 + (low_pc != NULL) 6941 + (high_pc != NULL) 6942 + (ranges != NULL) 6943 + (comp_dir != NULL)); 6944 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr, 6945 num_extra_attrs); 6946 6947 /* Copy over the attributes from the stub to the DIE we just read in. */ 6948 comp_unit_die = *result_comp_unit_die; 6949 i = comp_unit_die->num_attrs; 6950 if (stmt_list != NULL) 6951 comp_unit_die->attrs[i++] = *stmt_list; 6952 if (low_pc != NULL) 6953 comp_unit_die->attrs[i++] = *low_pc; 6954 if (high_pc != NULL) 6955 comp_unit_die->attrs[i++] = *high_pc; 6956 if (ranges != NULL) 6957 comp_unit_die->attrs[i++] = *ranges; 6958 if (comp_dir != NULL) 6959 comp_unit_die->attrs[i++] = *comp_dir; 6960 comp_unit_die->num_attrs += num_extra_attrs; 6961 6962 if (dwarf_die_debug) 6963 { 6964 fprintf_unfiltered (gdb_stdlog, 6965 "Read die from %s@0x%x of %s:\n", 6966 section->get_name (), 6967 (unsigned) (begin_info_ptr - section->buffer), 6968 bfd_get_filename (abfd)); 6969 dump_die (comp_unit_die, dwarf_die_debug); 6970 } 6971 6972 /* Skip dummy compilation units. */ 6973 if (info_ptr >= begin_info_ptr + dwo_unit->length 6974 || peek_abbrev_code (abfd, info_ptr) == 0) 6975 return 0; 6976 6977 *result_info_ptr = info_ptr; 6978 return 1; 6979 } 6980 6981 /* Return the signature of the compile unit, if found. In DWARF 4 and before, 6982 the signature is in the DW_AT_GNU_dwo_id attribute. In DWARF 5 and later, the 6983 signature is part of the header. */ 6984 static gdb::optional<ULONGEST> 6985 lookup_dwo_id (struct dwarf2_cu *cu, struct die_info* comp_unit_die) 6986 { 6987 if (cu->header.version >= 5) 6988 return cu->header.signature; 6989 struct attribute *attr; 6990 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu); 6991 if (attr == nullptr) 6992 return gdb::optional<ULONGEST> (); 6993 return DW_UNSND (attr); 6994 } 6995 6996 /* Subroutine of cutu_reader to simplify it. 6997 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU. 6998 Returns NULL if the specified DWO unit cannot be found. */ 6999 7000 static struct dwo_unit * 7001 lookup_dwo_unit (dwarf2_cu *cu, die_info *comp_unit_die, const char *dwo_name) 7002 { 7003 dwarf2_per_cu_data *per_cu = cu->per_cu; 7004 struct dwo_unit *dwo_unit; 7005 const char *comp_dir; 7006 7007 gdb_assert (cu != NULL); 7008 7009 /* Yeah, we look dwo_name up again, but it simplifies the code. */ 7010 dwo_name = dwarf2_dwo_name (comp_unit_die, cu); 7011 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu); 7012 7013 if (per_cu->is_debug_types) 7014 dwo_unit = lookup_dwo_type_unit (cu, dwo_name, comp_dir); 7015 else 7016 { 7017 gdb::optional<ULONGEST> signature = lookup_dwo_id (cu, comp_unit_die); 7018 7019 if (!signature.has_value ()) 7020 error (_("Dwarf Error: missing dwo_id for dwo_name %s" 7021 " [in module %s]"), 7022 dwo_name, bfd_get_filename (per_cu->per_bfd->obfd)); 7023 7024 dwo_unit = lookup_dwo_comp_unit (cu, dwo_name, comp_dir, *signature); 7025 } 7026 7027 return dwo_unit; 7028 } 7029 7030 /* Subroutine of cutu_reader to simplify it. 7031 See it for a description of the parameters. 7032 Read a TU directly from a DWO file, bypassing the stub. */ 7033 7034 void 7035 cutu_reader::init_tu_and_read_dwo_dies (dwarf2_per_cu_data *this_cu, 7036 dwarf2_per_objfile *per_objfile, 7037 dwarf2_cu *existing_cu) 7038 { 7039 struct signatured_type *sig_type; 7040 7041 /* Verify we can do the following downcast, and that we have the 7042 data we need. */ 7043 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly); 7044 sig_type = (struct signatured_type *) this_cu; 7045 gdb_assert (sig_type->dwo_unit != NULL); 7046 7047 dwarf2_cu *cu; 7048 7049 if (existing_cu != nullptr) 7050 { 7051 cu = existing_cu; 7052 gdb_assert (cu->dwo_unit == sig_type->dwo_unit); 7053 /* There's no need to do the rereading_dwo_cu handling that 7054 cutu_reader does since we don't read the stub. */ 7055 } 7056 else 7057 { 7058 /* If an existing_cu is provided, a dwarf2_cu must not exist for this_cu 7059 in per_objfile yet. */ 7060 gdb_assert (per_objfile->get_cu (this_cu) == nullptr); 7061 m_new_cu.reset (new dwarf2_cu (this_cu, per_objfile)); 7062 cu = m_new_cu.get (); 7063 } 7064 7065 /* A future optimization, if needed, would be to use an existing 7066 abbrev table. When reading DWOs with skeletonless TUs, all the TUs 7067 could share abbrev tables. */ 7068 7069 if (read_cutu_die_from_dwo (cu, sig_type->dwo_unit, 7070 NULL /* stub_comp_unit_die */, 7071 sig_type->dwo_unit->dwo_file->comp_dir, 7072 this, &info_ptr, 7073 &comp_unit_die, 7074 &m_dwo_abbrev_table) == 0) 7075 { 7076 /* Dummy die. */ 7077 dummy_p = true; 7078 } 7079 } 7080 7081 /* Initialize a CU (or TU) and read its DIEs. 7082 If the CU defers to a DWO file, read the DWO file as well. 7083 7084 ABBREV_TABLE, if non-NULL, is the abbreviation table to use. 7085 Otherwise the table specified in the comp unit header is read in and used. 7086 This is an optimization for when we already have the abbrev table. 7087 7088 If EXISTING_CU is non-NULL, then use it. Otherwise, a new CU is 7089 allocated. */ 7090 7091 cutu_reader::cutu_reader (dwarf2_per_cu_data *this_cu, 7092 dwarf2_per_objfile *per_objfile, 7093 struct abbrev_table *abbrev_table, 7094 dwarf2_cu *existing_cu, 7095 bool skip_partial) 7096 : die_reader_specs {}, 7097 m_this_cu (this_cu) 7098 { 7099 struct objfile *objfile = per_objfile->objfile; 7100 struct dwarf2_section_info *section = this_cu->section; 7101 bfd *abfd = section->get_bfd_owner (); 7102 const gdb_byte *begin_info_ptr; 7103 struct signatured_type *sig_type = NULL; 7104 struct dwarf2_section_info *abbrev_section; 7105 /* Non-zero if CU currently points to a DWO file and we need to 7106 reread it. When this happens we need to reread the skeleton die 7107 before we can reread the DWO file (this only applies to CUs, not TUs). */ 7108 int rereading_dwo_cu = 0; 7109 7110 if (dwarf_die_debug) 7111 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n", 7112 this_cu->is_debug_types ? "type" : "comp", 7113 sect_offset_str (this_cu->sect_off)); 7114 7115 /* If we're reading a TU directly from a DWO file, including a virtual DWO 7116 file (instead of going through the stub), short-circuit all of this. */ 7117 if (this_cu->reading_dwo_directly) 7118 { 7119 /* Narrow down the scope of possibilities to have to understand. */ 7120 gdb_assert (this_cu->is_debug_types); 7121 gdb_assert (abbrev_table == NULL); 7122 init_tu_and_read_dwo_dies (this_cu, per_objfile, existing_cu); 7123 return; 7124 } 7125 7126 /* This is cheap if the section is already read in. */ 7127 section->read (objfile); 7128 7129 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off); 7130 7131 abbrev_section = get_abbrev_section_for_cu (this_cu); 7132 7133 dwarf2_cu *cu; 7134 7135 if (existing_cu != nullptr) 7136 { 7137 cu = existing_cu; 7138 /* If this CU is from a DWO file we need to start over, we need to 7139 refetch the attributes from the skeleton CU. 7140 This could be optimized by retrieving those attributes from when we 7141 were here the first time: the previous comp_unit_die was stored in 7142 comp_unit_obstack. But there's no data yet that we need this 7143 optimization. */ 7144 if (cu->dwo_unit != NULL) 7145 rereading_dwo_cu = 1; 7146 } 7147 else 7148 { 7149 /* If an existing_cu is provided, a dwarf2_cu must not exist for this_cu 7150 in per_objfile yet. */ 7151 gdb_assert (per_objfile->get_cu (this_cu) == nullptr); 7152 m_new_cu.reset (new dwarf2_cu (this_cu, per_objfile)); 7153 cu = m_new_cu.get (); 7154 } 7155 7156 /* Get the header. */ 7157 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu) 7158 { 7159 /* We already have the header, there's no need to read it in again. */ 7160 info_ptr += to_underlying (cu->header.first_die_cu_offset); 7161 } 7162 else 7163 { 7164 if (this_cu->is_debug_types) 7165 { 7166 info_ptr = read_and_check_comp_unit_head (per_objfile, &cu->header, 7167 section, abbrev_section, 7168 info_ptr, rcuh_kind::TYPE); 7169 7170 /* Since per_cu is the first member of struct signatured_type, 7171 we can go from a pointer to one to a pointer to the other. */ 7172 sig_type = (struct signatured_type *) this_cu; 7173 gdb_assert (sig_type->signature == cu->header.signature); 7174 gdb_assert (sig_type->type_offset_in_tu 7175 == cu->header.type_cu_offset_in_tu); 7176 gdb_assert (this_cu->sect_off == cu->header.sect_off); 7177 7178 /* LENGTH has not been set yet for type units if we're 7179 using .gdb_index. */ 7180 this_cu->length = cu->header.get_length (); 7181 7182 /* Establish the type offset that can be used to lookup the type. */ 7183 sig_type->type_offset_in_section = 7184 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu); 7185 7186 this_cu->dwarf_version = cu->header.version; 7187 } 7188 else 7189 { 7190 info_ptr = read_and_check_comp_unit_head (per_objfile, &cu->header, 7191 section, abbrev_section, 7192 info_ptr, 7193 rcuh_kind::COMPILE); 7194 7195 gdb_assert (this_cu->sect_off == cu->header.sect_off); 7196 if (this_cu->length == 0) 7197 this_cu->length = cu->header.get_length (); 7198 else 7199 gdb_assert (this_cu->length == cu->header.get_length ()); 7200 this_cu->dwarf_version = cu->header.version; 7201 } 7202 } 7203 7204 /* Skip dummy compilation units. */ 7205 if (info_ptr >= begin_info_ptr + this_cu->length 7206 || peek_abbrev_code (abfd, info_ptr) == 0) 7207 { 7208 dummy_p = true; 7209 return; 7210 } 7211 7212 /* If we don't have them yet, read the abbrevs for this compilation unit. 7213 And if we need to read them now, make sure they're freed when we're 7214 done. */ 7215 if (abbrev_table != NULL) 7216 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off); 7217 else 7218 { 7219 m_abbrev_table_holder 7220 = abbrev_table::read (objfile, abbrev_section, 7221 cu->header.abbrev_sect_off); 7222 abbrev_table = m_abbrev_table_holder.get (); 7223 } 7224 7225 /* Read the top level CU/TU die. */ 7226 init_cu_die_reader (this, cu, section, NULL, abbrev_table); 7227 info_ptr = read_full_die (this, &comp_unit_die, info_ptr); 7228 7229 if (skip_partial && comp_unit_die->tag == DW_TAG_partial_unit) 7230 { 7231 dummy_p = true; 7232 return; 7233 } 7234 7235 /* If we are in a DWO stub, process it and then read in the "real" CU/TU 7236 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation 7237 table from the DWO file and pass the ownership over to us. It will be 7238 referenced from READER, so we must make sure to free it after we're done 7239 with READER. 7240 7241 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a 7242 DWO CU, that this test will fail (the attribute will not be present). */ 7243 const char *dwo_name = dwarf2_dwo_name (comp_unit_die, cu); 7244 if (dwo_name != nullptr) 7245 { 7246 struct dwo_unit *dwo_unit; 7247 struct die_info *dwo_comp_unit_die; 7248 7249 if (comp_unit_die->has_children) 7250 { 7251 complaint (_("compilation unit with DW_AT_GNU_dwo_name" 7252 " has children (offset %s) [in module %s]"), 7253 sect_offset_str (this_cu->sect_off), 7254 bfd_get_filename (abfd)); 7255 } 7256 dwo_unit = lookup_dwo_unit (cu, comp_unit_die, dwo_name); 7257 if (dwo_unit != NULL) 7258 { 7259 if (read_cutu_die_from_dwo (cu, dwo_unit, 7260 comp_unit_die, NULL, 7261 this, &info_ptr, 7262 &dwo_comp_unit_die, 7263 &m_dwo_abbrev_table) == 0) 7264 { 7265 /* Dummy die. */ 7266 dummy_p = true; 7267 return; 7268 } 7269 comp_unit_die = dwo_comp_unit_die; 7270 } 7271 else 7272 { 7273 /* Yikes, we couldn't find the rest of the DIE, we only have 7274 the stub. A complaint has already been logged. There's 7275 not much more we can do except pass on the stub DIE to 7276 die_reader_func. We don't want to throw an error on bad 7277 debug info. */ 7278 } 7279 } 7280 } 7281 7282 void 7283 cutu_reader::keep () 7284 { 7285 /* Done, clean up. */ 7286 gdb_assert (!dummy_p); 7287 if (m_new_cu != NULL) 7288 { 7289 /* Save this dwarf2_cu in the per_objfile. The per_objfile owns it 7290 now. */ 7291 dwarf2_per_objfile *per_objfile = m_new_cu->per_objfile; 7292 per_objfile->set_cu (m_this_cu, m_new_cu.release ()); 7293 } 7294 } 7295 7296 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name (DW_AT_dwo_name) 7297 if present. DWO_FILE, if non-NULL, is the DWO file to read (the caller is 7298 assumed to have already done the lookup to find the DWO file). 7299 7300 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and 7301 THIS_CU->is_debug_types, but nothing else. 7302 7303 We fill in THIS_CU->length. 7304 7305 THIS_CU->cu is always freed when done. 7306 This is done in order to not leave THIS_CU->cu in a state where we have 7307 to care whether it refers to the "main" CU or the DWO CU. 7308 7309 When parent_cu is passed, it is used to provide a default value for 7310 str_offsets_base and addr_base from the parent. */ 7311 7312 cutu_reader::cutu_reader (dwarf2_per_cu_data *this_cu, 7313 dwarf2_per_objfile *per_objfile, 7314 struct dwarf2_cu *parent_cu, 7315 struct dwo_file *dwo_file) 7316 : die_reader_specs {}, 7317 m_this_cu (this_cu) 7318 { 7319 struct objfile *objfile = per_objfile->objfile; 7320 struct dwarf2_section_info *section = this_cu->section; 7321 bfd *abfd = section->get_bfd_owner (); 7322 struct dwarf2_section_info *abbrev_section; 7323 const gdb_byte *begin_info_ptr, *info_ptr; 7324 7325 if (dwarf_die_debug) 7326 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n", 7327 this_cu->is_debug_types ? "type" : "comp", 7328 sect_offset_str (this_cu->sect_off)); 7329 7330 gdb_assert (per_objfile->get_cu (this_cu) == nullptr); 7331 7332 abbrev_section = (dwo_file != NULL 7333 ? &dwo_file->sections.abbrev 7334 : get_abbrev_section_for_cu (this_cu)); 7335 7336 /* This is cheap if the section is already read in. */ 7337 section->read (objfile); 7338 7339 m_new_cu.reset (new dwarf2_cu (this_cu, per_objfile)); 7340 7341 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off); 7342 info_ptr = read_and_check_comp_unit_head (per_objfile, &m_new_cu->header, 7343 section, abbrev_section, info_ptr, 7344 (this_cu->is_debug_types 7345 ? rcuh_kind::TYPE 7346 : rcuh_kind::COMPILE)); 7347 7348 if (parent_cu != nullptr) 7349 { 7350 m_new_cu->str_offsets_base = parent_cu->str_offsets_base; 7351 m_new_cu->addr_base = parent_cu->addr_base; 7352 } 7353 this_cu->length = m_new_cu->header.get_length (); 7354 7355 /* Skip dummy compilation units. */ 7356 if (info_ptr >= begin_info_ptr + this_cu->length 7357 || peek_abbrev_code (abfd, info_ptr) == 0) 7358 { 7359 dummy_p = true; 7360 return; 7361 } 7362 7363 m_abbrev_table_holder 7364 = abbrev_table::read (objfile, abbrev_section, 7365 m_new_cu->header.abbrev_sect_off); 7366 7367 init_cu_die_reader (this, m_new_cu.get (), section, dwo_file, 7368 m_abbrev_table_holder.get ()); 7369 info_ptr = read_full_die (this, &comp_unit_die, info_ptr); 7370 } 7371 7372 7373 /* Type Unit Groups. 7374 7375 Type Unit Groups are a way to collapse the set of all TUs (type units) into 7376 a more manageable set. The grouping is done by DW_AT_stmt_list entry 7377 so that all types coming from the same compilation (.o file) are grouped 7378 together. A future step could be to put the types in the same symtab as 7379 the CU the types ultimately came from. */ 7380 7381 static hashval_t 7382 hash_type_unit_group (const void *item) 7383 { 7384 const struct type_unit_group *tu_group 7385 = (const struct type_unit_group *) item; 7386 7387 return hash_stmt_list_entry (&tu_group->hash); 7388 } 7389 7390 static int 7391 eq_type_unit_group (const void *item_lhs, const void *item_rhs) 7392 { 7393 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs; 7394 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs; 7395 7396 return eq_stmt_list_entry (&lhs->hash, &rhs->hash); 7397 } 7398 7399 /* Allocate a hash table for type unit groups. */ 7400 7401 static htab_up 7402 allocate_type_unit_groups_table () 7403 { 7404 return htab_up (htab_create_alloc (3, 7405 hash_type_unit_group, 7406 eq_type_unit_group, 7407 NULL, xcalloc, xfree)); 7408 } 7409 7410 /* Type units that don't have DW_AT_stmt_list are grouped into their own 7411 partial symtabs. We combine several TUs per psymtab to not let the size 7412 of any one psymtab grow too big. */ 7413 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31) 7414 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10 7415 7416 /* Helper routine for get_type_unit_group. 7417 Create the type_unit_group object used to hold one or more TUs. */ 7418 7419 static struct type_unit_group * 7420 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct) 7421 { 7422 dwarf2_per_objfile *per_objfile = cu->per_objfile; 7423 dwarf2_per_bfd *per_bfd = per_objfile->per_bfd; 7424 struct dwarf2_per_cu_data *per_cu; 7425 struct type_unit_group *tu_group; 7426 7427 tu_group = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, type_unit_group); 7428 per_cu = &tu_group->per_cu; 7429 per_cu->per_bfd = per_bfd; 7430 7431 if (per_bfd->using_index) 7432 { 7433 per_cu->v.quick = OBSTACK_ZALLOC (&per_bfd->obstack, 7434 struct dwarf2_per_cu_quick_data); 7435 } 7436 else 7437 { 7438 unsigned int line_offset = to_underlying (line_offset_struct); 7439 dwarf2_psymtab *pst; 7440 std::string name; 7441 7442 /* Give the symtab a useful name for debug purposes. */ 7443 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0) 7444 name = string_printf ("<type_units_%d>", 7445 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB)); 7446 else 7447 name = string_printf ("<type_units_at_0x%x>", line_offset); 7448 7449 pst = create_partial_symtab (per_cu, per_objfile, name.c_str ()); 7450 pst->anonymous = true; 7451 } 7452 7453 tu_group->hash.dwo_unit = cu->dwo_unit; 7454 tu_group->hash.line_sect_off = line_offset_struct; 7455 7456 return tu_group; 7457 } 7458 7459 /* Look up the type_unit_group for type unit CU, and create it if necessary. 7460 STMT_LIST is a DW_AT_stmt_list attribute. */ 7461 7462 static struct type_unit_group * 7463 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list) 7464 { 7465 dwarf2_per_objfile *per_objfile = cu->per_objfile; 7466 struct tu_stats *tu_stats = &per_objfile->per_bfd->tu_stats; 7467 struct type_unit_group *tu_group; 7468 void **slot; 7469 unsigned int line_offset; 7470 struct type_unit_group type_unit_group_for_lookup; 7471 7472 if (per_objfile->per_bfd->type_unit_groups == NULL) 7473 per_objfile->per_bfd->type_unit_groups = allocate_type_unit_groups_table (); 7474 7475 /* Do we need to create a new group, or can we use an existing one? */ 7476 7477 if (stmt_list) 7478 { 7479 line_offset = DW_UNSND (stmt_list); 7480 ++tu_stats->nr_symtab_sharers; 7481 } 7482 else 7483 { 7484 /* Ugh, no stmt_list. Rare, but we have to handle it. 7485 We can do various things here like create one group per TU or 7486 spread them over multiple groups to split up the expansion work. 7487 To avoid worst case scenarios (too many groups or too large groups) 7488 we, umm, group them in bunches. */ 7489 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB 7490 | (tu_stats->nr_stmt_less_type_units 7491 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE)); 7492 ++tu_stats->nr_stmt_less_type_units; 7493 } 7494 7495 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit; 7496 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset; 7497 slot = htab_find_slot (per_objfile->per_bfd->type_unit_groups.get (), 7498 &type_unit_group_for_lookup, INSERT); 7499 if (*slot != NULL) 7500 { 7501 tu_group = (struct type_unit_group *) *slot; 7502 gdb_assert (tu_group != NULL); 7503 } 7504 else 7505 { 7506 sect_offset line_offset_struct = (sect_offset) line_offset; 7507 tu_group = create_type_unit_group (cu, line_offset_struct); 7508 *slot = tu_group; 7509 ++tu_stats->nr_symtabs; 7510 } 7511 7512 return tu_group; 7513 } 7514 7515 /* Partial symbol tables. */ 7516 7517 /* Create a psymtab named NAME and assign it to PER_CU. 7518 7519 The caller must fill in the following details: 7520 dirname, textlow, texthigh. */ 7521 7522 static dwarf2_psymtab * 7523 create_partial_symtab (dwarf2_per_cu_data *per_cu, 7524 dwarf2_per_objfile *per_objfile, 7525 const char *name) 7526 { 7527 struct objfile *objfile = per_objfile->objfile; 7528 dwarf2_psymtab *pst; 7529 7530 pst = new dwarf2_psymtab (name, objfile, per_cu); 7531 7532 pst->psymtabs_addrmap_supported = true; 7533 7534 /* This is the glue that links PST into GDB's symbol API. */ 7535 per_cu->v.psymtab = pst; 7536 7537 return pst; 7538 } 7539 7540 /* DIE reader function for process_psymtab_comp_unit. */ 7541 7542 static void 7543 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader, 7544 const gdb_byte *info_ptr, 7545 struct die_info *comp_unit_die, 7546 enum language pretend_language) 7547 { 7548 struct dwarf2_cu *cu = reader->cu; 7549 dwarf2_per_objfile *per_objfile = cu->per_objfile; 7550 struct objfile *objfile = per_objfile->objfile; 7551 struct gdbarch *gdbarch = objfile->arch (); 7552 struct dwarf2_per_cu_data *per_cu = cu->per_cu; 7553 CORE_ADDR baseaddr; 7554 CORE_ADDR best_lowpc = 0, best_highpc = 0; 7555 dwarf2_psymtab *pst; 7556 enum pc_bounds_kind cu_bounds_kind; 7557 const char *filename; 7558 7559 gdb_assert (! per_cu->is_debug_types); 7560 7561 prepare_one_comp_unit (cu, comp_unit_die, pretend_language); 7562 7563 /* Allocate a new partial symbol table structure. */ 7564 gdb::unique_xmalloc_ptr<char> debug_filename; 7565 static const char artificial[] = "<artificial>"; 7566 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu); 7567 if (filename == NULL) 7568 filename = ""; 7569 else if (strcmp (filename, artificial) == 0) 7570 { 7571 debug_filename.reset (concat (artificial, "@", 7572 sect_offset_str (per_cu->sect_off), 7573 (char *) NULL)); 7574 filename = debug_filename.get (); 7575 } 7576 7577 pst = create_partial_symtab (per_cu, per_objfile, filename); 7578 7579 /* This must be done before calling dwarf2_build_include_psymtabs. */ 7580 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu); 7581 7582 baseaddr = objfile->text_section_offset (); 7583 7584 dwarf2_find_base_address (comp_unit_die, cu); 7585 7586 /* Possibly set the default values of LOWPC and HIGHPC from 7587 `DW_AT_ranges'. */ 7588 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc, 7589 &best_highpc, cu, pst); 7590 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc) 7591 { 7592 CORE_ADDR low 7593 = (gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr) 7594 - baseaddr); 7595 CORE_ADDR high 7596 = (gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr) 7597 - baseaddr - 1); 7598 /* Store the contiguous range if it is not empty; it can be 7599 empty for CUs with no code. */ 7600 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap, 7601 low, high, pst); 7602 } 7603 7604 /* Check if comp unit has_children. 7605 If so, read the rest of the partial symbols from this comp unit. 7606 If not, there's no more debug_info for this comp unit. */ 7607 if (comp_unit_die->has_children) 7608 { 7609 struct partial_die_info *first_die; 7610 CORE_ADDR lowpc, highpc; 7611 7612 lowpc = ((CORE_ADDR) -1); 7613 highpc = ((CORE_ADDR) 0); 7614 7615 first_die = load_partial_dies (reader, info_ptr, 1); 7616 7617 scan_partial_symbols (first_die, &lowpc, &highpc, 7618 cu_bounds_kind <= PC_BOUNDS_INVALID, cu); 7619 7620 /* If we didn't find a lowpc, set it to highpc to avoid 7621 complaints from `maint check'. */ 7622 if (lowpc == ((CORE_ADDR) -1)) 7623 lowpc = highpc; 7624 7625 /* If the compilation unit didn't have an explicit address range, 7626 then use the information extracted from its child dies. */ 7627 if (cu_bounds_kind <= PC_BOUNDS_INVALID) 7628 { 7629 best_lowpc = lowpc; 7630 best_highpc = highpc; 7631 } 7632 } 7633 pst->set_text_low (gdbarch_adjust_dwarf2_addr (gdbarch, 7634 best_lowpc + baseaddr) 7635 - baseaddr); 7636 pst->set_text_high (gdbarch_adjust_dwarf2_addr (gdbarch, 7637 best_highpc + baseaddr) 7638 - baseaddr); 7639 7640 end_psymtab_common (objfile, pst); 7641 7642 if (!cu->per_cu->imported_symtabs_empty ()) 7643 { 7644 int i; 7645 int len = cu->per_cu->imported_symtabs_size (); 7646 7647 /* Fill in 'dependencies' here; we fill in 'users' in a 7648 post-pass. */ 7649 pst->number_of_dependencies = len; 7650 pst->dependencies 7651 = objfile->partial_symtabs->allocate_dependencies (len); 7652 for (i = 0; i < len; ++i) 7653 { 7654 pst->dependencies[i] 7655 = cu->per_cu->imported_symtabs->at (i)->v.psymtab; 7656 } 7657 7658 cu->per_cu->imported_symtabs_free (); 7659 } 7660 7661 /* Get the list of files included in the current compilation unit, 7662 and build a psymtab for each of them. */ 7663 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst); 7664 7665 if (dwarf_read_debug) 7666 fprintf_unfiltered (gdb_stdlog, 7667 "Psymtab for %s unit @%s: %s - %s" 7668 ", %d global, %d static syms\n", 7669 per_cu->is_debug_types ? "type" : "comp", 7670 sect_offset_str (per_cu->sect_off), 7671 paddress (gdbarch, pst->text_low (objfile)), 7672 paddress (gdbarch, pst->text_high (objfile)), 7673 pst->n_global_syms, pst->n_static_syms); 7674 } 7675 7676 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it. 7677 Process compilation unit THIS_CU for a psymtab. */ 7678 7679 static void 7680 process_psymtab_comp_unit (dwarf2_per_cu_data *this_cu, 7681 dwarf2_per_objfile *per_objfile, 7682 bool want_partial_unit, 7683 enum language pretend_language) 7684 { 7685 /* If this compilation unit was already read in, free the 7686 cached copy in order to read it in again. This is 7687 necessary because we skipped some symbols when we first 7688 read in the compilation unit (see load_partial_dies). 7689 This problem could be avoided, but the benefit is unclear. */ 7690 per_objfile->remove_cu (this_cu); 7691 7692 cutu_reader reader (this_cu, per_objfile, nullptr, nullptr, false); 7693 7694 switch (reader.comp_unit_die->tag) 7695 { 7696 case DW_TAG_compile_unit: 7697 this_cu->unit_type = DW_UT_compile; 7698 break; 7699 case DW_TAG_partial_unit: 7700 this_cu->unit_type = DW_UT_partial; 7701 break; 7702 default: 7703 abort (); 7704 } 7705 7706 if (reader.dummy_p) 7707 { 7708 /* Nothing. */ 7709 } 7710 else if (this_cu->is_debug_types) 7711 build_type_psymtabs_reader (&reader, reader.info_ptr, 7712 reader.comp_unit_die); 7713 else if (want_partial_unit 7714 || reader.comp_unit_die->tag != DW_TAG_partial_unit) 7715 process_psymtab_comp_unit_reader (&reader, reader.info_ptr, 7716 reader.comp_unit_die, 7717 pretend_language); 7718 7719 this_cu->lang = reader.cu->language; 7720 7721 /* Age out any secondary CUs. */ 7722 per_objfile->age_comp_units (); 7723 } 7724 7725 /* Reader function for build_type_psymtabs. */ 7726 7727 static void 7728 build_type_psymtabs_reader (const struct die_reader_specs *reader, 7729 const gdb_byte *info_ptr, 7730 struct die_info *type_unit_die) 7731 { 7732 dwarf2_per_objfile *per_objfile = reader->cu->per_objfile; 7733 struct objfile *objfile = per_objfile->objfile; 7734 struct dwarf2_cu *cu = reader->cu; 7735 struct dwarf2_per_cu_data *per_cu = cu->per_cu; 7736 struct signatured_type *sig_type; 7737 struct type_unit_group *tu_group; 7738 struct attribute *attr; 7739 struct partial_die_info *first_die; 7740 CORE_ADDR lowpc, highpc; 7741 dwarf2_psymtab *pst; 7742 7743 gdb_assert (per_cu->is_debug_types); 7744 sig_type = (struct signatured_type *) per_cu; 7745 7746 if (! type_unit_die->has_children) 7747 return; 7748 7749 attr = type_unit_die->attr (DW_AT_stmt_list); 7750 tu_group = get_type_unit_group (cu, attr); 7751 7752 if (tu_group->tus == nullptr) 7753 tu_group->tus = new std::vector<signatured_type *>; 7754 tu_group->tus->push_back (sig_type); 7755 7756 prepare_one_comp_unit (cu, type_unit_die, language_minimal); 7757 pst = create_partial_symtab (per_cu, per_objfile, ""); 7758 pst->anonymous = true; 7759 7760 first_die = load_partial_dies (reader, info_ptr, 1); 7761 7762 lowpc = (CORE_ADDR) -1; 7763 highpc = (CORE_ADDR) 0; 7764 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu); 7765 7766 end_psymtab_common (objfile, pst); 7767 } 7768 7769 /* Struct used to sort TUs by their abbreviation table offset. */ 7770 7771 struct tu_abbrev_offset 7772 { 7773 tu_abbrev_offset (signatured_type *sig_type_, sect_offset abbrev_offset_) 7774 : sig_type (sig_type_), abbrev_offset (abbrev_offset_) 7775 {} 7776 7777 signatured_type *sig_type; 7778 sect_offset abbrev_offset; 7779 }; 7780 7781 /* Helper routine for build_type_psymtabs_1, passed to std::sort. */ 7782 7783 static bool 7784 sort_tu_by_abbrev_offset (const struct tu_abbrev_offset &a, 7785 const struct tu_abbrev_offset &b) 7786 { 7787 return a.abbrev_offset < b.abbrev_offset; 7788 } 7789 7790 /* Efficiently read all the type units. 7791 This does the bulk of the work for build_type_psymtabs. 7792 7793 The efficiency is because we sort TUs by the abbrev table they use and 7794 only read each abbrev table once. In one program there are 200K TUs 7795 sharing 8K abbrev tables. 7796 7797 The main purpose of this function is to support building the 7798 dwarf2_per_objfile->per_bfd->type_unit_groups table. 7799 TUs typically share the DW_AT_stmt_list of the CU they came from, so we 7800 can collapse the search space by grouping them by stmt_list. 7801 The savings can be significant, in the same program from above the 200K TUs 7802 share 8K stmt_list tables. 7803 7804 FUNC is expected to call get_type_unit_group, which will create the 7805 struct type_unit_group if necessary and add it to 7806 dwarf2_per_objfile->per_bfd->type_unit_groups. */ 7807 7808 static void 7809 build_type_psymtabs_1 (dwarf2_per_objfile *per_objfile) 7810 { 7811 struct tu_stats *tu_stats = &per_objfile->per_bfd->tu_stats; 7812 abbrev_table_up abbrev_table; 7813 sect_offset abbrev_offset; 7814 7815 /* It's up to the caller to not call us multiple times. */ 7816 gdb_assert (per_objfile->per_bfd->type_unit_groups == NULL); 7817 7818 if (per_objfile->per_bfd->all_type_units.empty ()) 7819 return; 7820 7821 /* TUs typically share abbrev tables, and there can be way more TUs than 7822 abbrev tables. Sort by abbrev table to reduce the number of times we 7823 read each abbrev table in. 7824 Alternatives are to punt or to maintain a cache of abbrev tables. 7825 This is simpler and efficient enough for now. 7826 7827 Later we group TUs by their DW_AT_stmt_list value (as this defines the 7828 symtab to use). Typically TUs with the same abbrev offset have the same 7829 stmt_list value too so in practice this should work well. 7830 7831 The basic algorithm here is: 7832 7833 sort TUs by abbrev table 7834 for each TU with same abbrev table: 7835 read abbrev table if first user 7836 read TU top level DIE 7837 [IWBN if DWO skeletons had DW_AT_stmt_list] 7838 call FUNC */ 7839 7840 if (dwarf_read_debug) 7841 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n"); 7842 7843 /* Sort in a separate table to maintain the order of all_type_units 7844 for .gdb_index: TU indices directly index all_type_units. */ 7845 std::vector<tu_abbrev_offset> sorted_by_abbrev; 7846 sorted_by_abbrev.reserve (per_objfile->per_bfd->all_type_units.size ()); 7847 7848 for (signatured_type *sig_type : per_objfile->per_bfd->all_type_units) 7849 sorted_by_abbrev.emplace_back 7850 (sig_type, read_abbrev_offset (per_objfile, sig_type->per_cu.section, 7851 sig_type->per_cu.sect_off)); 7852 7853 std::sort (sorted_by_abbrev.begin (), sorted_by_abbrev.end (), 7854 sort_tu_by_abbrev_offset); 7855 7856 abbrev_offset = (sect_offset) ~(unsigned) 0; 7857 7858 for (const tu_abbrev_offset &tu : sorted_by_abbrev) 7859 { 7860 /* Switch to the next abbrev table if necessary. */ 7861 if (abbrev_table == NULL 7862 || tu.abbrev_offset != abbrev_offset) 7863 { 7864 abbrev_offset = tu.abbrev_offset; 7865 abbrev_table = 7866 abbrev_table::read (per_objfile->objfile, 7867 &per_objfile->per_bfd->abbrev, abbrev_offset); 7868 ++tu_stats->nr_uniq_abbrev_tables; 7869 } 7870 7871 cutu_reader reader (&tu.sig_type->per_cu, per_objfile, 7872 abbrev_table.get (), nullptr, false); 7873 if (!reader.dummy_p) 7874 build_type_psymtabs_reader (&reader, reader.info_ptr, 7875 reader.comp_unit_die); 7876 } 7877 } 7878 7879 /* Print collected type unit statistics. */ 7880 7881 static void 7882 print_tu_stats (dwarf2_per_objfile *per_objfile) 7883 { 7884 struct tu_stats *tu_stats = &per_objfile->per_bfd->tu_stats; 7885 7886 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n"); 7887 fprintf_unfiltered (gdb_stdlog, " %zu TUs\n", 7888 per_objfile->per_bfd->all_type_units.size ()); 7889 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n", 7890 tu_stats->nr_uniq_abbrev_tables); 7891 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n", 7892 tu_stats->nr_symtabs); 7893 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n", 7894 tu_stats->nr_symtab_sharers); 7895 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n", 7896 tu_stats->nr_stmt_less_type_units); 7897 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n", 7898 tu_stats->nr_all_type_units_reallocs); 7899 } 7900 7901 /* Traversal function for build_type_psymtabs. */ 7902 7903 static int 7904 build_type_psymtab_dependencies (void **slot, void *info) 7905 { 7906 dwarf2_per_objfile *per_objfile = (dwarf2_per_objfile *) info; 7907 struct objfile *objfile = per_objfile->objfile; 7908 struct type_unit_group *tu_group = (struct type_unit_group *) *slot; 7909 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu; 7910 dwarf2_psymtab *pst = per_cu->v.psymtab; 7911 int len = (tu_group->tus == nullptr) ? 0 : tu_group->tus->size (); 7912 int i; 7913 7914 gdb_assert (len > 0); 7915 gdb_assert (per_cu->type_unit_group_p ()); 7916 7917 pst->number_of_dependencies = len; 7918 pst->dependencies = objfile->partial_symtabs->allocate_dependencies (len); 7919 for (i = 0; i < len; ++i) 7920 { 7921 struct signatured_type *iter = tu_group->tus->at (i); 7922 gdb_assert (iter->per_cu.is_debug_types); 7923 pst->dependencies[i] = iter->per_cu.v.psymtab; 7924 iter->type_unit_group = tu_group; 7925 } 7926 7927 delete tu_group->tus; 7928 tu_group->tus = nullptr; 7929 7930 return 1; 7931 } 7932 7933 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it. 7934 Build partial symbol tables for the .debug_types comp-units. */ 7935 7936 static void 7937 build_type_psymtabs (dwarf2_per_objfile *per_objfile) 7938 { 7939 if (! create_all_type_units (per_objfile)) 7940 return; 7941 7942 build_type_psymtabs_1 (per_objfile); 7943 } 7944 7945 /* Traversal function for process_skeletonless_type_unit. 7946 Read a TU in a DWO file and build partial symbols for it. */ 7947 7948 static int 7949 process_skeletonless_type_unit (void **slot, void *info) 7950 { 7951 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot; 7952 dwarf2_per_objfile *per_objfile = (dwarf2_per_objfile *) info; 7953 struct signatured_type find_entry, *entry; 7954 7955 /* If this TU doesn't exist in the global table, add it and read it in. */ 7956 7957 if (per_objfile->per_bfd->signatured_types == NULL) 7958 per_objfile->per_bfd->signatured_types = allocate_signatured_type_table (); 7959 7960 find_entry.signature = dwo_unit->signature; 7961 slot = htab_find_slot (per_objfile->per_bfd->signatured_types.get (), 7962 &find_entry, INSERT); 7963 /* If we've already seen this type there's nothing to do. What's happening 7964 is we're doing our own version of comdat-folding here. */ 7965 if (*slot != NULL) 7966 return 1; 7967 7968 /* This does the job that create_all_type_units would have done for 7969 this TU. */ 7970 entry = add_type_unit (per_objfile, dwo_unit->signature, slot); 7971 fill_in_sig_entry_from_dwo_entry (per_objfile, entry, dwo_unit); 7972 *slot = entry; 7973 7974 /* This does the job that build_type_psymtabs_1 would have done. */ 7975 cutu_reader reader (&entry->per_cu, per_objfile, nullptr, nullptr, false); 7976 if (!reader.dummy_p) 7977 build_type_psymtabs_reader (&reader, reader.info_ptr, 7978 reader.comp_unit_die); 7979 7980 return 1; 7981 } 7982 7983 /* Traversal function for process_skeletonless_type_units. */ 7984 7985 static int 7986 process_dwo_file_for_skeletonless_type_units (void **slot, void *info) 7987 { 7988 struct dwo_file *dwo_file = (struct dwo_file *) *slot; 7989 7990 if (dwo_file->tus != NULL) 7991 htab_traverse_noresize (dwo_file->tus.get (), 7992 process_skeletonless_type_unit, info); 7993 7994 return 1; 7995 } 7996 7997 /* Scan all TUs of DWO files, verifying we've processed them. 7998 This is needed in case a TU was emitted without its skeleton. 7999 Note: This can't be done until we know what all the DWO files are. */ 8000 8001 static void 8002 process_skeletonless_type_units (dwarf2_per_objfile *per_objfile) 8003 { 8004 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */ 8005 if (get_dwp_file (per_objfile) == NULL 8006 && per_objfile->per_bfd->dwo_files != NULL) 8007 { 8008 htab_traverse_noresize (per_objfile->per_bfd->dwo_files.get (), 8009 process_dwo_file_for_skeletonless_type_units, 8010 per_objfile); 8011 } 8012 } 8013 8014 /* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */ 8015 8016 static void 8017 set_partial_user (dwarf2_per_objfile *per_objfile) 8018 { 8019 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 8020 { 8021 dwarf2_psymtab *pst = per_cu->v.psymtab; 8022 8023 if (pst == NULL) 8024 continue; 8025 8026 for (int j = 0; j < pst->number_of_dependencies; ++j) 8027 { 8028 /* Set the 'user' field only if it is not already set. */ 8029 if (pst->dependencies[j]->user == NULL) 8030 pst->dependencies[j]->user = pst; 8031 } 8032 } 8033 } 8034 8035 /* Build the partial symbol table by doing a quick pass through the 8036 .debug_info and .debug_abbrev sections. */ 8037 8038 static void 8039 dwarf2_build_psymtabs_hard (dwarf2_per_objfile *per_objfile) 8040 { 8041 struct objfile *objfile = per_objfile->objfile; 8042 8043 if (dwarf_read_debug) 8044 { 8045 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n", 8046 objfile_name (objfile)); 8047 } 8048 8049 scoped_restore restore_reading_psyms 8050 = make_scoped_restore (&per_objfile->per_bfd->reading_partial_symbols, 8051 true); 8052 8053 per_objfile->per_bfd->info.read (objfile); 8054 8055 /* Any cached compilation units will be linked by the per-objfile 8056 read_in_chain. Make sure to free them when we're done. */ 8057 free_cached_comp_units freer (per_objfile); 8058 8059 build_type_psymtabs (per_objfile); 8060 8061 create_all_comp_units (per_objfile); 8062 8063 /* Create a temporary address map on a temporary obstack. We later 8064 copy this to the final obstack. */ 8065 auto_obstack temp_obstack; 8066 8067 scoped_restore save_psymtabs_addrmap 8068 = make_scoped_restore (&objfile->partial_symtabs->psymtabs_addrmap, 8069 addrmap_create_mutable (&temp_obstack)); 8070 8071 for (dwarf2_per_cu_data *per_cu : per_objfile->per_bfd->all_comp_units) 8072 { 8073 if (per_cu->v.psymtab != NULL) 8074 /* In case a forward DW_TAG_imported_unit has read the CU already. */ 8075 continue; 8076 process_psymtab_comp_unit (per_cu, per_objfile, false, 8077 language_minimal); 8078 } 8079 8080 /* This has to wait until we read the CUs, we need the list of DWOs. */ 8081 process_skeletonless_type_units (per_objfile); 8082 8083 /* Now that all TUs have been processed we can fill in the dependencies. */ 8084 if (per_objfile->per_bfd->type_unit_groups != NULL) 8085 { 8086 htab_traverse_noresize (per_objfile->per_bfd->type_unit_groups.get (), 8087 build_type_psymtab_dependencies, per_objfile); 8088 } 8089 8090 if (dwarf_read_debug) 8091 print_tu_stats (per_objfile); 8092 8093 set_partial_user (per_objfile); 8094 8095 objfile->partial_symtabs->psymtabs_addrmap 8096 = addrmap_create_fixed (objfile->partial_symtabs->psymtabs_addrmap, 8097 objfile->partial_symtabs->obstack ()); 8098 /* At this point we want to keep the address map. */ 8099 save_psymtabs_addrmap.release (); 8100 8101 if (dwarf_read_debug) 8102 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n", 8103 objfile_name (objfile)); 8104 } 8105 8106 /* Load the partial DIEs for a secondary CU into memory. 8107 This is also used when rereading a primary CU with load_all_dies. */ 8108 8109 static void 8110 load_partial_comp_unit (dwarf2_per_cu_data *this_cu, 8111 dwarf2_per_objfile *per_objfile, 8112 dwarf2_cu *existing_cu) 8113 { 8114 cutu_reader reader (this_cu, per_objfile, nullptr, existing_cu, false); 8115 8116 if (!reader.dummy_p) 8117 { 8118 prepare_one_comp_unit (reader.cu, reader.comp_unit_die, 8119 language_minimal); 8120 8121 /* Check if comp unit has_children. 8122 If so, read the rest of the partial symbols from this comp unit. 8123 If not, there's no more debug_info for this comp unit. */ 8124 if (reader.comp_unit_die->has_children) 8125 load_partial_dies (&reader, reader.info_ptr, 0); 8126 8127 reader.keep (); 8128 } 8129 } 8130 8131 static void 8132 read_comp_units_from_section (dwarf2_per_objfile *per_objfile, 8133 struct dwarf2_section_info *section, 8134 struct dwarf2_section_info *abbrev_section, 8135 unsigned int is_dwz) 8136 { 8137 const gdb_byte *info_ptr; 8138 struct objfile *objfile = per_objfile->objfile; 8139 8140 if (dwarf_read_debug) 8141 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n", 8142 section->get_name (), 8143 section->get_file_name ()); 8144 8145 section->read (objfile); 8146 8147 info_ptr = section->buffer; 8148 8149 while (info_ptr < section->buffer + section->size) 8150 { 8151 struct dwarf2_per_cu_data *this_cu; 8152 8153 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer); 8154 8155 comp_unit_head cu_header; 8156 read_and_check_comp_unit_head (per_objfile, &cu_header, section, 8157 abbrev_section, info_ptr, 8158 rcuh_kind::COMPILE); 8159 8160 /* Save the compilation unit for later lookup. */ 8161 if (cu_header.unit_type != DW_UT_type) 8162 this_cu = per_objfile->per_bfd->allocate_per_cu (); 8163 else 8164 { 8165 auto sig_type = per_objfile->per_bfd->allocate_signatured_type (); 8166 sig_type->signature = cu_header.signature; 8167 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu; 8168 this_cu = &sig_type->per_cu; 8169 } 8170 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type); 8171 this_cu->sect_off = sect_off; 8172 this_cu->length = cu_header.length + cu_header.initial_length_size; 8173 this_cu->is_dwz = is_dwz; 8174 this_cu->section = section; 8175 8176 per_objfile->per_bfd->all_comp_units.push_back (this_cu); 8177 8178 info_ptr = info_ptr + this_cu->length; 8179 } 8180 } 8181 8182 /* Create a list of all compilation units in OBJFILE. 8183 This is only done for -readnow and building partial symtabs. */ 8184 8185 static void 8186 create_all_comp_units (dwarf2_per_objfile *per_objfile) 8187 { 8188 gdb_assert (per_objfile->per_bfd->all_comp_units.empty ()); 8189 read_comp_units_from_section (per_objfile, &per_objfile->per_bfd->info, 8190 &per_objfile->per_bfd->abbrev, 0); 8191 8192 dwz_file *dwz = dwarf2_get_dwz_file (per_objfile->per_bfd); 8193 if (dwz != NULL) 8194 read_comp_units_from_section (per_objfile, &dwz->info, &dwz->abbrev, 1); 8195 } 8196 8197 /* Process all loaded DIEs for compilation unit CU, starting at 8198 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation 8199 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or 8200 DW_AT_ranges). See the comments of add_partial_subprogram on how 8201 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */ 8202 8203 static void 8204 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc, 8205 CORE_ADDR *highpc, int set_addrmap, 8206 struct dwarf2_cu *cu) 8207 { 8208 struct partial_die_info *pdi; 8209 8210 /* Now, march along the PDI's, descending into ones which have 8211 interesting children but skipping the children of the other ones, 8212 until we reach the end of the compilation unit. */ 8213 8214 pdi = first_die; 8215 8216 while (pdi != NULL) 8217 { 8218 pdi->fixup (cu); 8219 8220 /* Anonymous namespaces or modules have no name but have interesting 8221 children, so we need to look at them. Ditto for anonymous 8222 enums. */ 8223 8224 if (pdi->raw_name != NULL || pdi->tag == DW_TAG_namespace 8225 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type 8226 || pdi->tag == DW_TAG_imported_unit 8227 || pdi->tag == DW_TAG_inlined_subroutine) 8228 { 8229 switch (pdi->tag) 8230 { 8231 case DW_TAG_subprogram: 8232 case DW_TAG_inlined_subroutine: 8233 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu); 8234 if (cu->language == language_cplus) 8235 scan_partial_symbols (pdi->die_child, lowpc, highpc, 8236 set_addrmap, cu); 8237 break; 8238 case DW_TAG_constant: 8239 case DW_TAG_variable: 8240 case DW_TAG_typedef: 8241 case DW_TAG_union_type: 8242 if (!pdi->is_declaration 8243 || (pdi->tag == DW_TAG_variable && pdi->is_external)) 8244 { 8245 add_partial_symbol (pdi, cu); 8246 } 8247 break; 8248 case DW_TAG_class_type: 8249 case DW_TAG_interface_type: 8250 case DW_TAG_structure_type: 8251 if (!pdi->is_declaration) 8252 { 8253 add_partial_symbol (pdi, cu); 8254 } 8255 if ((cu->language == language_rust 8256 || cu->language == language_cplus) && pdi->has_children) 8257 scan_partial_symbols (pdi->die_child, lowpc, highpc, 8258 set_addrmap, cu); 8259 break; 8260 case DW_TAG_enumeration_type: 8261 if (!pdi->is_declaration) 8262 add_partial_enumeration (pdi, cu); 8263 break; 8264 case DW_TAG_base_type: 8265 case DW_TAG_subrange_type: 8266 /* File scope base type definitions are added to the partial 8267 symbol table. */ 8268 add_partial_symbol (pdi, cu); 8269 break; 8270 case DW_TAG_namespace: 8271 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu); 8272 break; 8273 case DW_TAG_module: 8274 if (!pdi->is_declaration) 8275 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu); 8276 break; 8277 case DW_TAG_imported_unit: 8278 { 8279 struct dwarf2_per_cu_data *per_cu; 8280 8281 /* For now we don't handle imported units in type units. */ 8282 if (cu->per_cu->is_debug_types) 8283 { 8284 error (_("Dwarf Error: DW_TAG_imported_unit is not" 8285 " supported in type units [in module %s]"), 8286 objfile_name (cu->per_objfile->objfile)); 8287 } 8288 8289 per_cu = dwarf2_find_containing_comp_unit 8290 (pdi->d.sect_off, pdi->is_dwz, cu->per_objfile); 8291 8292 /* Go read the partial unit, if needed. */ 8293 if (per_cu->v.psymtab == NULL) 8294 process_psymtab_comp_unit (per_cu, cu->per_objfile, true, 8295 cu->language); 8296 8297 cu->per_cu->imported_symtabs_push (per_cu); 8298 } 8299 break; 8300 case DW_TAG_imported_declaration: 8301 add_partial_symbol (pdi, cu); 8302 break; 8303 default: 8304 break; 8305 } 8306 } 8307 8308 /* If the die has a sibling, skip to the sibling. */ 8309 8310 pdi = pdi->die_sibling; 8311 } 8312 } 8313 8314 /* Functions used to compute the fully scoped name of a partial DIE. 8315 8316 Normally, this is simple. For C++, the parent DIE's fully scoped 8317 name is concatenated with "::" and the partial DIE's name. 8318 Enumerators are an exception; they use the scope of their parent 8319 enumeration type, i.e. the name of the enumeration type is not 8320 prepended to the enumerator. 8321 8322 There are two complexities. One is DW_AT_specification; in this 8323 case "parent" means the parent of the target of the specification, 8324 instead of the direct parent of the DIE. The other is compilers 8325 which do not emit DW_TAG_namespace; in this case we try to guess 8326 the fully qualified name of structure types from their members' 8327 linkage names. This must be done using the DIE's children rather 8328 than the children of any DW_AT_specification target. We only need 8329 to do this for structures at the top level, i.e. if the target of 8330 any DW_AT_specification (if any; otherwise the DIE itself) does not 8331 have a parent. */ 8332 8333 /* Compute the scope prefix associated with PDI's parent, in 8334 compilation unit CU. The result will be allocated on CU's 8335 comp_unit_obstack, or a copy of the already allocated PDI->NAME 8336 field. NULL is returned if no prefix is necessary. */ 8337 static const char * 8338 partial_die_parent_scope (struct partial_die_info *pdi, 8339 struct dwarf2_cu *cu) 8340 { 8341 const char *grandparent_scope; 8342 struct partial_die_info *parent, *real_pdi; 8343 8344 /* We need to look at our parent DIE; if we have a DW_AT_specification, 8345 then this means the parent of the specification DIE. */ 8346 8347 real_pdi = pdi; 8348 while (real_pdi->has_specification) 8349 { 8350 auto res = find_partial_die (real_pdi->spec_offset, 8351 real_pdi->spec_is_dwz, cu); 8352 real_pdi = res.pdi; 8353 cu = res.cu; 8354 } 8355 8356 parent = real_pdi->die_parent; 8357 if (parent == NULL) 8358 return NULL; 8359 8360 if (parent->scope_set) 8361 return parent->scope; 8362 8363 parent->fixup (cu); 8364 8365 grandparent_scope = partial_die_parent_scope (parent, cu); 8366 8367 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus 8368 DW_TAG_namespace DIEs with a name of "::" for the global namespace. 8369 Work around this problem here. */ 8370 if (cu->language == language_cplus 8371 && parent->tag == DW_TAG_namespace 8372 && strcmp (parent->name (cu), "::") == 0 8373 && grandparent_scope == NULL) 8374 { 8375 parent->scope = NULL; 8376 parent->scope_set = 1; 8377 return NULL; 8378 } 8379 8380 /* Nested subroutines in Fortran get a prefix. */ 8381 if (pdi->tag == DW_TAG_enumerator) 8382 /* Enumerators should not get the name of the enumeration as a prefix. */ 8383 parent->scope = grandparent_scope; 8384 else if (parent->tag == DW_TAG_namespace 8385 || parent->tag == DW_TAG_module 8386 || parent->tag == DW_TAG_structure_type 8387 || parent->tag == DW_TAG_class_type 8388 || parent->tag == DW_TAG_interface_type 8389 || parent->tag == DW_TAG_union_type 8390 || parent->tag == DW_TAG_enumeration_type 8391 || (cu->language == language_fortran 8392 && parent->tag == DW_TAG_subprogram 8393 && pdi->tag == DW_TAG_subprogram)) 8394 { 8395 if (grandparent_scope == NULL) 8396 parent->scope = parent->name (cu); 8397 else 8398 parent->scope = typename_concat (&cu->comp_unit_obstack, 8399 grandparent_scope, 8400 parent->name (cu), 0, cu); 8401 } 8402 else 8403 { 8404 /* FIXME drow/2004-04-01: What should we be doing with 8405 function-local names? For partial symbols, we should probably be 8406 ignoring them. */ 8407 complaint (_("unhandled containing DIE tag %s for DIE at %s"), 8408 dwarf_tag_name (parent->tag), 8409 sect_offset_str (pdi->sect_off)); 8410 parent->scope = grandparent_scope; 8411 } 8412 8413 parent->scope_set = 1; 8414 return parent->scope; 8415 } 8416 8417 /* Return the fully scoped name associated with PDI, from compilation unit 8418 CU. The result will be allocated with malloc. */ 8419 8420 static gdb::unique_xmalloc_ptr<char> 8421 partial_die_full_name (struct partial_die_info *pdi, 8422 struct dwarf2_cu *cu) 8423 { 8424 const char *parent_scope; 8425 8426 /* If this is a template instantiation, we can not work out the 8427 template arguments from partial DIEs. So, unfortunately, we have 8428 to go through the full DIEs. At least any work we do building 8429 types here will be reused if full symbols are loaded later. */ 8430 if (pdi->has_template_arguments) 8431 { 8432 pdi->fixup (cu); 8433 8434 if (pdi->name (cu) != NULL && strchr (pdi->name (cu), '<') == NULL) 8435 { 8436 struct die_info *die; 8437 struct attribute attr; 8438 struct dwarf2_cu *ref_cu = cu; 8439 8440 /* DW_FORM_ref_addr is using section offset. */ 8441 attr.name = (enum dwarf_attribute) 0; 8442 attr.form = DW_FORM_ref_addr; 8443 attr.u.unsnd = to_underlying (pdi->sect_off); 8444 die = follow_die_ref (NULL, &attr, &ref_cu); 8445 8446 return make_unique_xstrdup (dwarf2_full_name (NULL, die, ref_cu)); 8447 } 8448 } 8449 8450 parent_scope = partial_die_parent_scope (pdi, cu); 8451 if (parent_scope == NULL) 8452 return NULL; 8453 else 8454 return gdb::unique_xmalloc_ptr<char> (typename_concat (NULL, parent_scope, 8455 pdi->name (cu), 8456 0, cu)); 8457 } 8458 8459 static void 8460 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu) 8461 { 8462 dwarf2_per_objfile *per_objfile = cu->per_objfile; 8463 struct objfile *objfile = per_objfile->objfile; 8464 struct gdbarch *gdbarch = objfile->arch (); 8465 CORE_ADDR addr = 0; 8466 const char *actual_name = NULL; 8467 CORE_ADDR baseaddr; 8468 8469 baseaddr = objfile->text_section_offset (); 8470 8471 gdb::unique_xmalloc_ptr<char> built_actual_name 8472 = partial_die_full_name (pdi, cu); 8473 if (built_actual_name != NULL) 8474 actual_name = built_actual_name.get (); 8475 8476 if (actual_name == NULL) 8477 actual_name = pdi->name (cu); 8478 8479 partial_symbol psymbol; 8480 memset (&psymbol, 0, sizeof (psymbol)); 8481 psymbol.ginfo.set_language (cu->language, &objfile->objfile_obstack); 8482 psymbol.ginfo.section = -1; 8483 8484 /* The code below indicates that the psymbol should be installed by 8485 setting this. */ 8486 gdb::optional<psymbol_placement> where; 8487 8488 switch (pdi->tag) 8489 { 8490 case DW_TAG_inlined_subroutine: 8491 case DW_TAG_subprogram: 8492 addr = (gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr) 8493 - baseaddr); 8494 if (pdi->is_external 8495 || cu->language == language_ada 8496 || (cu->language == language_fortran 8497 && pdi->die_parent != NULL 8498 && pdi->die_parent->tag == DW_TAG_subprogram)) 8499 { 8500 /* Normally, only "external" DIEs are part of the global scope. 8501 But in Ada and Fortran, we want to be able to access nested 8502 procedures globally. So all Ada and Fortran subprograms are 8503 stored in the global scope. */ 8504 where = psymbol_placement::GLOBAL; 8505 } 8506 else 8507 where = psymbol_placement::STATIC; 8508 8509 psymbol.domain = VAR_DOMAIN; 8510 psymbol.aclass = LOC_BLOCK; 8511 psymbol.ginfo.section = SECT_OFF_TEXT (objfile); 8512 psymbol.ginfo.value.address = addr; 8513 8514 if (pdi->main_subprogram && actual_name != NULL) 8515 set_objfile_main_name (objfile, actual_name, cu->language); 8516 break; 8517 case DW_TAG_constant: 8518 psymbol.domain = VAR_DOMAIN; 8519 psymbol.aclass = LOC_STATIC; 8520 where = (pdi->is_external 8521 ? psymbol_placement::GLOBAL 8522 : psymbol_placement::STATIC); 8523 break; 8524 case DW_TAG_variable: 8525 if (pdi->d.locdesc) 8526 addr = decode_locdesc (pdi->d.locdesc, cu); 8527 8528 if (pdi->d.locdesc 8529 && addr == 0 8530 && !per_objfile->per_bfd->has_section_at_zero) 8531 { 8532 /* A global or static variable may also have been stripped 8533 out by the linker if unused, in which case its address 8534 will be nullified; do not add such variables into partial 8535 symbol table then. */ 8536 } 8537 else if (pdi->is_external) 8538 { 8539 /* Global Variable. 8540 Don't enter into the minimal symbol tables as there is 8541 a minimal symbol table entry from the ELF symbols already. 8542 Enter into partial symbol table if it has a location 8543 descriptor or a type. 8544 If the location descriptor is missing, new_symbol will create 8545 a LOC_UNRESOLVED symbol, the address of the variable will then 8546 be determined from the minimal symbol table whenever the variable 8547 is referenced. 8548 The address for the partial symbol table entry is not 8549 used by GDB, but it comes in handy for debugging partial symbol 8550 table building. */ 8551 8552 if (pdi->d.locdesc || pdi->has_type) 8553 { 8554 psymbol.domain = VAR_DOMAIN; 8555 psymbol.aclass = LOC_STATIC; 8556 psymbol.ginfo.section = SECT_OFF_TEXT (objfile); 8557 psymbol.ginfo.value.address = addr; 8558 where = psymbol_placement::GLOBAL; 8559 } 8560 } 8561 else 8562 { 8563 int has_loc = pdi->d.locdesc != NULL; 8564 8565 /* Static Variable. Skip symbols whose value we cannot know (those 8566 without location descriptors or constant values). */ 8567 if (!has_loc && !pdi->has_const_value) 8568 return; 8569 8570 psymbol.domain = VAR_DOMAIN; 8571 psymbol.aclass = LOC_STATIC; 8572 psymbol.ginfo.section = SECT_OFF_TEXT (objfile); 8573 if (has_loc) 8574 psymbol.ginfo.value.address = addr; 8575 where = psymbol_placement::STATIC; 8576 } 8577 break; 8578 case DW_TAG_typedef: 8579 case DW_TAG_base_type: 8580 case DW_TAG_subrange_type: 8581 psymbol.domain = VAR_DOMAIN; 8582 psymbol.aclass = LOC_TYPEDEF; 8583 where = psymbol_placement::STATIC; 8584 break; 8585 case DW_TAG_imported_declaration: 8586 case DW_TAG_namespace: 8587 psymbol.domain = VAR_DOMAIN; 8588 psymbol.aclass = LOC_TYPEDEF; 8589 where = psymbol_placement::GLOBAL; 8590 break; 8591 case DW_TAG_module: 8592 /* With Fortran 77 there might be a "BLOCK DATA" module 8593 available without any name. If so, we skip the module as it 8594 doesn't bring any value. */ 8595 if (actual_name != nullptr) 8596 { 8597 psymbol.domain = MODULE_DOMAIN; 8598 psymbol.aclass = LOC_TYPEDEF; 8599 where = psymbol_placement::GLOBAL; 8600 } 8601 break; 8602 case DW_TAG_class_type: 8603 case DW_TAG_interface_type: 8604 case DW_TAG_structure_type: 8605 case DW_TAG_union_type: 8606 case DW_TAG_enumeration_type: 8607 /* Skip external references. The DWARF standard says in the section 8608 about "Structure, Union, and Class Type Entries": "An incomplete 8609 structure, union or class type is represented by a structure, 8610 union or class entry that does not have a byte size attribute 8611 and that has a DW_AT_declaration attribute." */ 8612 if (!pdi->has_byte_size && pdi->is_declaration) 8613 return; 8614 8615 /* NOTE: carlton/2003-10-07: See comment in new_symbol about 8616 static vs. global. */ 8617 psymbol.domain = STRUCT_DOMAIN; 8618 psymbol.aclass = LOC_TYPEDEF; 8619 where = (cu->language == language_cplus 8620 ? psymbol_placement::GLOBAL 8621 : psymbol_placement::STATIC); 8622 break; 8623 case DW_TAG_enumerator: 8624 psymbol.domain = VAR_DOMAIN; 8625 psymbol.aclass = LOC_CONST; 8626 where = (cu->language == language_cplus 8627 ? psymbol_placement::GLOBAL 8628 : psymbol_placement::STATIC); 8629 break; 8630 default: 8631 break; 8632 } 8633 8634 if (where.has_value ()) 8635 { 8636 if (built_actual_name != nullptr) 8637 actual_name = objfile->intern (actual_name); 8638 if (pdi->linkage_name == nullptr || cu->language == language_ada) 8639 psymbol.ginfo.set_linkage_name (actual_name); 8640 else 8641 { 8642 psymbol.ginfo.set_demangled_name (actual_name, 8643 &objfile->objfile_obstack); 8644 psymbol.ginfo.set_linkage_name (pdi->linkage_name); 8645 } 8646 add_psymbol_to_list (psymbol, *where, objfile); 8647 } 8648 } 8649 8650 /* Read a partial die corresponding to a namespace; also, add a symbol 8651 corresponding to that namespace to the symbol table. NAMESPACE is 8652 the name of the enclosing namespace. */ 8653 8654 static void 8655 add_partial_namespace (struct partial_die_info *pdi, 8656 CORE_ADDR *lowpc, CORE_ADDR *highpc, 8657 int set_addrmap, struct dwarf2_cu *cu) 8658 { 8659 /* Add a symbol for the namespace. */ 8660 8661 add_partial_symbol (pdi, cu); 8662 8663 /* Now scan partial symbols in that namespace. */ 8664 8665 if (pdi->has_children) 8666 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu); 8667 } 8668 8669 /* Read a partial die corresponding to a Fortran module. */ 8670 8671 static void 8672 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, 8673 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu) 8674 { 8675 /* Add a symbol for the namespace. */ 8676 8677 add_partial_symbol (pdi, cu); 8678 8679 /* Now scan partial symbols in that module. */ 8680 8681 if (pdi->has_children) 8682 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu); 8683 } 8684 8685 /* Read a partial die corresponding to a subprogram or an inlined 8686 subprogram and create a partial symbol for that subprogram. 8687 When the CU language allows it, this routine also defines a partial 8688 symbol for each nested subprogram that this subprogram contains. 8689 If SET_ADDRMAP is true, record the covered ranges in the addrmap. 8690 Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI. 8691 8692 PDI may also be a lexical block, in which case we simply search 8693 recursively for subprograms defined inside that lexical block. 8694 Again, this is only performed when the CU language allows this 8695 type of definitions. */ 8696 8697 static void 8698 add_partial_subprogram (struct partial_die_info *pdi, 8699 CORE_ADDR *lowpc, CORE_ADDR *highpc, 8700 int set_addrmap, struct dwarf2_cu *cu) 8701 { 8702 if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine) 8703 { 8704 if (pdi->has_pc_info) 8705 { 8706 if (pdi->lowpc < *lowpc) 8707 *lowpc = pdi->lowpc; 8708 if (pdi->highpc > *highpc) 8709 *highpc = pdi->highpc; 8710 if (set_addrmap) 8711 { 8712 struct objfile *objfile = cu->per_objfile->objfile; 8713 struct gdbarch *gdbarch = objfile->arch (); 8714 CORE_ADDR baseaddr; 8715 CORE_ADDR this_highpc; 8716 CORE_ADDR this_lowpc; 8717 8718 baseaddr = objfile->text_section_offset (); 8719 this_lowpc 8720 = (gdbarch_adjust_dwarf2_addr (gdbarch, 8721 pdi->lowpc + baseaddr) 8722 - baseaddr); 8723 this_highpc 8724 = (gdbarch_adjust_dwarf2_addr (gdbarch, 8725 pdi->highpc + baseaddr) 8726 - baseaddr); 8727 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap, 8728 this_lowpc, this_highpc - 1, 8729 cu->per_cu->v.psymtab); 8730 } 8731 } 8732 8733 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined)) 8734 { 8735 if (!pdi->is_declaration) 8736 /* Ignore subprogram DIEs that do not have a name, they are 8737 illegal. Do not emit a complaint at this point, we will 8738 do so when we convert this psymtab into a symtab. */ 8739 if (pdi->name (cu)) 8740 add_partial_symbol (pdi, cu); 8741 } 8742 } 8743 8744 if (! pdi->has_children) 8745 return; 8746 8747 if (cu->language == language_ada || cu->language == language_fortran) 8748 { 8749 pdi = pdi->die_child; 8750 while (pdi != NULL) 8751 { 8752 pdi->fixup (cu); 8753 if (pdi->tag == DW_TAG_subprogram 8754 || pdi->tag == DW_TAG_inlined_subroutine 8755 || pdi->tag == DW_TAG_lexical_block) 8756 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu); 8757 pdi = pdi->die_sibling; 8758 } 8759 } 8760 } 8761 8762 /* Read a partial die corresponding to an enumeration type. */ 8763 8764 static void 8765 add_partial_enumeration (struct partial_die_info *enum_pdi, 8766 struct dwarf2_cu *cu) 8767 { 8768 struct partial_die_info *pdi; 8769 8770 if (enum_pdi->name (cu) != NULL) 8771 add_partial_symbol (enum_pdi, cu); 8772 8773 pdi = enum_pdi->die_child; 8774 while (pdi) 8775 { 8776 if (pdi->tag != DW_TAG_enumerator || pdi->raw_name == NULL) 8777 complaint (_("malformed enumerator DIE ignored")); 8778 else 8779 add_partial_symbol (pdi, cu); 8780 pdi = pdi->die_sibling; 8781 } 8782 } 8783 8784 /* Return the initial uleb128 in the die at INFO_PTR. */ 8785 8786 static unsigned int 8787 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr) 8788 { 8789 unsigned int bytes_read; 8790 8791 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 8792 } 8793 8794 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit 8795 READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation. 8796 8797 Return the corresponding abbrev, or NULL if the number is zero (indicating 8798 an empty DIE). In either case *BYTES_READ will be set to the length of 8799 the initial number. */ 8800 8801 static struct abbrev_info * 8802 peek_die_abbrev (const die_reader_specs &reader, 8803 const gdb_byte *info_ptr, unsigned int *bytes_read) 8804 { 8805 dwarf2_cu *cu = reader.cu; 8806 bfd *abfd = cu->per_objfile->objfile->obfd; 8807 unsigned int abbrev_number 8808 = read_unsigned_leb128 (abfd, info_ptr, bytes_read); 8809 8810 if (abbrev_number == 0) 8811 return NULL; 8812 8813 abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number); 8814 if (!abbrev) 8815 { 8816 error (_("Dwarf Error: Could not find abbrev number %d in %s" 8817 " at offset %s [in module %s]"), 8818 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU", 8819 sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd)); 8820 } 8821 8822 return abbrev; 8823 } 8824 8825 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. 8826 Returns a pointer to the end of a series of DIEs, terminated by an empty 8827 DIE. Any children of the skipped DIEs will also be skipped. */ 8828 8829 static const gdb_byte * 8830 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr) 8831 { 8832 while (1) 8833 { 8834 unsigned int bytes_read; 8835 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read); 8836 8837 if (abbrev == NULL) 8838 return info_ptr + bytes_read; 8839 else 8840 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); 8841 } 8842 } 8843 8844 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. 8845 INFO_PTR should point just after the initial uleb128 of a DIE, and the 8846 abbrev corresponding to that skipped uleb128 should be passed in 8847 ABBREV. Returns a pointer to this DIE's sibling, skipping any 8848 children. */ 8849 8850 static const gdb_byte * 8851 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr, 8852 struct abbrev_info *abbrev) 8853 { 8854 unsigned int bytes_read; 8855 struct attribute attr; 8856 bfd *abfd = reader->abfd; 8857 struct dwarf2_cu *cu = reader->cu; 8858 const gdb_byte *buffer = reader->buffer; 8859 const gdb_byte *buffer_end = reader->buffer_end; 8860 unsigned int form, i; 8861 8862 for (i = 0; i < abbrev->num_attrs; i++) 8863 { 8864 /* The only abbrev we care about is DW_AT_sibling. */ 8865 if (abbrev->attrs[i].name == DW_AT_sibling) 8866 { 8867 bool ignored; 8868 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr, 8869 &ignored); 8870 if (attr.form == DW_FORM_ref_addr) 8871 complaint (_("ignoring absolute DW_AT_sibling")); 8872 else 8873 { 8874 sect_offset off = attr.get_ref_die_offset (); 8875 const gdb_byte *sibling_ptr = buffer + to_underlying (off); 8876 8877 if (sibling_ptr < info_ptr) 8878 complaint (_("DW_AT_sibling points backwards")); 8879 else if (sibling_ptr > reader->buffer_end) 8880 reader->die_section->overflow_complaint (); 8881 else 8882 return sibling_ptr; 8883 } 8884 } 8885 8886 /* If it isn't DW_AT_sibling, skip this attribute. */ 8887 form = abbrev->attrs[i].form; 8888 skip_attribute: 8889 switch (form) 8890 { 8891 case DW_FORM_ref_addr: 8892 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3 8893 and later it is offset sized. */ 8894 if (cu->header.version == 2) 8895 info_ptr += cu->header.addr_size; 8896 else 8897 info_ptr += cu->header.offset_size; 8898 break; 8899 case DW_FORM_GNU_ref_alt: 8900 info_ptr += cu->header.offset_size; 8901 break; 8902 case DW_FORM_addr: 8903 info_ptr += cu->header.addr_size; 8904 break; 8905 case DW_FORM_data1: 8906 case DW_FORM_ref1: 8907 case DW_FORM_flag: 8908 case DW_FORM_strx1: 8909 info_ptr += 1; 8910 break; 8911 case DW_FORM_flag_present: 8912 case DW_FORM_implicit_const: 8913 break; 8914 case DW_FORM_data2: 8915 case DW_FORM_ref2: 8916 case DW_FORM_strx2: 8917 info_ptr += 2; 8918 break; 8919 case DW_FORM_strx3: 8920 info_ptr += 3; 8921 break; 8922 case DW_FORM_data4: 8923 case DW_FORM_ref4: 8924 case DW_FORM_strx4: 8925 info_ptr += 4; 8926 break; 8927 case DW_FORM_data8: 8928 case DW_FORM_ref8: 8929 case DW_FORM_ref_sig8: 8930 info_ptr += 8; 8931 break; 8932 case DW_FORM_data16: 8933 info_ptr += 16; 8934 break; 8935 case DW_FORM_string: 8936 read_direct_string (abfd, info_ptr, &bytes_read); 8937 info_ptr += bytes_read; 8938 break; 8939 case DW_FORM_sec_offset: 8940 case DW_FORM_strp: 8941 case DW_FORM_GNU_strp_alt: 8942 info_ptr += cu->header.offset_size; 8943 break; 8944 case DW_FORM_exprloc: 8945 case DW_FORM_block: 8946 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 8947 info_ptr += bytes_read; 8948 break; 8949 case DW_FORM_block1: 8950 info_ptr += 1 + read_1_byte (abfd, info_ptr); 8951 break; 8952 case DW_FORM_block2: 8953 info_ptr += 2 + read_2_bytes (abfd, info_ptr); 8954 break; 8955 case DW_FORM_block4: 8956 info_ptr += 4 + read_4_bytes (abfd, info_ptr); 8957 break; 8958 case DW_FORM_addrx: 8959 case DW_FORM_strx: 8960 case DW_FORM_sdata: 8961 case DW_FORM_udata: 8962 case DW_FORM_ref_udata: 8963 case DW_FORM_GNU_addr_index: 8964 case DW_FORM_GNU_str_index: 8965 case DW_FORM_rnglistx: 8966 case DW_FORM_loclistx: 8967 info_ptr = safe_skip_leb128 (info_ptr, buffer_end); 8968 break; 8969 case DW_FORM_indirect: 8970 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 8971 info_ptr += bytes_read; 8972 /* We need to continue parsing from here, so just go back to 8973 the top. */ 8974 goto skip_attribute; 8975 8976 default: 8977 error (_("Dwarf Error: Cannot handle %s " 8978 "in DWARF reader [in module %s]"), 8979 dwarf_form_name (form), 8980 bfd_get_filename (abfd)); 8981 } 8982 } 8983 8984 if (abbrev->has_children) 8985 return skip_children (reader, info_ptr); 8986 else 8987 return info_ptr; 8988 } 8989 8990 /* Locate ORIG_PDI's sibling. 8991 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */ 8992 8993 static const gdb_byte * 8994 locate_pdi_sibling (const struct die_reader_specs *reader, 8995 struct partial_die_info *orig_pdi, 8996 const gdb_byte *info_ptr) 8997 { 8998 /* Do we know the sibling already? */ 8999 9000 if (orig_pdi->sibling) 9001 return orig_pdi->sibling; 9002 9003 /* Are there any children to deal with? */ 9004 9005 if (!orig_pdi->has_children) 9006 return info_ptr; 9007 9008 /* Skip the children the long way. */ 9009 9010 return skip_children (reader, info_ptr); 9011 } 9012 9013 /* Expand this partial symbol table into a full symbol table. SELF is 9014 not NULL. */ 9015 9016 void 9017 dwarf2_psymtab::read_symtab (struct objfile *objfile) 9018 { 9019 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 9020 9021 gdb_assert (!per_objfile->symtab_set_p (per_cu_data)); 9022 9023 /* If this psymtab is constructed from a debug-only objfile, the 9024 has_section_at_zero flag will not necessarily be correct. We 9025 can get the correct value for this flag by looking at the data 9026 associated with the (presumably stripped) associated objfile. */ 9027 if (objfile->separate_debug_objfile_backlink) 9028 { 9029 dwarf2_per_objfile *per_objfile_backlink 9030 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink); 9031 9032 per_objfile->per_bfd->has_section_at_zero 9033 = per_objfile_backlink->per_bfd->has_section_at_zero; 9034 } 9035 9036 expand_psymtab (objfile); 9037 9038 process_cu_includes (per_objfile); 9039 } 9040 9041 /* Reading in full CUs. */ 9042 9043 /* Add PER_CU to the queue. */ 9044 9045 static void 9046 queue_comp_unit (dwarf2_per_cu_data *per_cu, 9047 dwarf2_per_objfile *per_objfile, 9048 enum language pretend_language) 9049 { 9050 per_cu->queued = 1; 9051 per_cu->per_bfd->queue.emplace (per_cu, per_objfile, pretend_language); 9052 } 9053 9054 /* If PER_CU is not yet queued, add it to the queue. 9055 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a 9056 dependency. 9057 The result is non-zero if PER_CU was queued, otherwise the result is zero 9058 meaning either PER_CU is already queued or it is already loaded. 9059 9060 N.B. There is an invariant here that if a CU is queued then it is loaded. 9061 The caller is required to load PER_CU if we return non-zero. */ 9062 9063 static int 9064 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu, 9065 dwarf2_per_cu_data *per_cu, 9066 dwarf2_per_objfile *per_objfile, 9067 enum language pretend_language) 9068 { 9069 /* We may arrive here during partial symbol reading, if we need full 9070 DIEs to process an unusual case (e.g. template arguments). Do 9071 not queue PER_CU, just tell our caller to load its DIEs. */ 9072 if (per_cu->per_bfd->reading_partial_symbols) 9073 { 9074 dwarf2_cu *cu = per_objfile->get_cu (per_cu); 9075 9076 if (cu == NULL || cu->dies == NULL) 9077 return 1; 9078 return 0; 9079 } 9080 9081 /* Mark the dependence relation so that we don't flush PER_CU 9082 too early. */ 9083 if (dependent_cu != NULL) 9084 dwarf2_add_dependence (dependent_cu, per_cu); 9085 9086 /* If it's already on the queue, we have nothing to do. */ 9087 if (per_cu->queued) 9088 return 0; 9089 9090 /* If the compilation unit is already loaded, just mark it as 9091 used. */ 9092 dwarf2_cu *cu = per_objfile->get_cu (per_cu); 9093 if (cu != nullptr) 9094 { 9095 cu->last_used = 0; 9096 return 0; 9097 } 9098 9099 /* Add it to the queue. */ 9100 queue_comp_unit (per_cu, per_objfile, pretend_language); 9101 9102 return 1; 9103 } 9104 9105 /* Process the queue. */ 9106 9107 static void 9108 process_queue (dwarf2_per_objfile *per_objfile) 9109 { 9110 if (dwarf_read_debug) 9111 { 9112 fprintf_unfiltered (gdb_stdlog, 9113 "Expanding one or more symtabs of objfile %s ...\n", 9114 objfile_name (per_objfile->objfile)); 9115 } 9116 9117 /* The queue starts out with one item, but following a DIE reference 9118 may load a new CU, adding it to the end of the queue. */ 9119 while (!per_objfile->per_bfd->queue.empty ()) 9120 { 9121 dwarf2_queue_item &item = per_objfile->per_bfd->queue.front (); 9122 dwarf2_per_cu_data *per_cu = item.per_cu; 9123 9124 if (!per_objfile->symtab_set_p (per_cu)) 9125 { 9126 dwarf2_cu *cu = per_objfile->get_cu (per_cu); 9127 9128 /* Skip dummy CUs. */ 9129 if (cu != nullptr) 9130 { 9131 unsigned int debug_print_threshold; 9132 char buf[100]; 9133 9134 if (per_cu->is_debug_types) 9135 { 9136 struct signatured_type *sig_type = 9137 (struct signatured_type *) per_cu; 9138 9139 sprintf (buf, "TU %s at offset %s", 9140 hex_string (sig_type->signature), 9141 sect_offset_str (per_cu->sect_off)); 9142 /* There can be 100s of TUs. 9143 Only print them in verbose mode. */ 9144 debug_print_threshold = 2; 9145 } 9146 else 9147 { 9148 sprintf (buf, "CU at offset %s", 9149 sect_offset_str (per_cu->sect_off)); 9150 debug_print_threshold = 1; 9151 } 9152 9153 if (dwarf_read_debug >= debug_print_threshold) 9154 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf); 9155 9156 if (per_cu->is_debug_types) 9157 process_full_type_unit (cu, item.pretend_language); 9158 else 9159 process_full_comp_unit (cu, item.pretend_language); 9160 9161 if (dwarf_read_debug >= debug_print_threshold) 9162 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf); 9163 } 9164 } 9165 9166 per_cu->queued = 0; 9167 per_objfile->per_bfd->queue.pop (); 9168 } 9169 9170 if (dwarf_read_debug) 9171 { 9172 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n", 9173 objfile_name (per_objfile->objfile)); 9174 } 9175 } 9176 9177 /* Read in full symbols for PST, and anything it depends on. */ 9178 9179 void 9180 dwarf2_psymtab::expand_psymtab (struct objfile *objfile) 9181 { 9182 gdb_assert (!readin_p (objfile)); 9183 9184 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 9185 free_cached_comp_units freer (per_objfile); 9186 expand_dependencies (objfile); 9187 9188 dw2_do_instantiate_symtab (per_cu_data, per_objfile, false); 9189 gdb_assert (get_compunit_symtab (objfile) != nullptr); 9190 } 9191 9192 /* See psympriv.h. */ 9193 9194 bool 9195 dwarf2_psymtab::readin_p (struct objfile *objfile) const 9196 { 9197 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 9198 return per_objfile->symtab_set_p (per_cu_data); 9199 } 9200 9201 /* See psympriv.h. */ 9202 9203 compunit_symtab * 9204 dwarf2_psymtab::get_compunit_symtab (struct objfile *objfile) const 9205 { 9206 dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); 9207 return per_objfile->get_symtab (per_cu_data); 9208 } 9209 9210 /* Trivial hash function for die_info: the hash value of a DIE 9211 is its offset in .debug_info for this objfile. */ 9212 9213 static hashval_t 9214 die_hash (const void *item) 9215 { 9216 const struct die_info *die = (const struct die_info *) item; 9217 9218 return to_underlying (die->sect_off); 9219 } 9220 9221 /* Trivial comparison function for die_info structures: two DIEs 9222 are equal if they have the same offset. */ 9223 9224 static int 9225 die_eq (const void *item_lhs, const void *item_rhs) 9226 { 9227 const struct die_info *die_lhs = (const struct die_info *) item_lhs; 9228 const struct die_info *die_rhs = (const struct die_info *) item_rhs; 9229 9230 return die_lhs->sect_off == die_rhs->sect_off; 9231 } 9232 9233 /* Load the DIEs associated with PER_CU into memory. */ 9234 9235 static void 9236 load_full_comp_unit (dwarf2_per_cu_data *this_cu, 9237 dwarf2_per_objfile *per_objfile, 9238 bool skip_partial, 9239 enum language pretend_language) 9240 { 9241 gdb_assert (! this_cu->is_debug_types); 9242 9243 dwarf2_cu *existing_cu = per_objfile->get_cu (this_cu); 9244 cutu_reader reader (this_cu, per_objfile, NULL, existing_cu, skip_partial); 9245 if (reader.dummy_p) 9246 return; 9247 9248 struct dwarf2_cu *cu = reader.cu; 9249 const gdb_byte *info_ptr = reader.info_ptr; 9250 9251 gdb_assert (cu->die_hash == NULL); 9252 cu->die_hash = 9253 htab_create_alloc_ex (cu->header.length / 12, 9254 die_hash, 9255 die_eq, 9256 NULL, 9257 &cu->comp_unit_obstack, 9258 hashtab_obstack_allocate, 9259 dummy_obstack_deallocate); 9260 9261 if (reader.comp_unit_die->has_children) 9262 reader.comp_unit_die->child 9263 = read_die_and_siblings (&reader, reader.info_ptr, 9264 &info_ptr, reader.comp_unit_die); 9265 cu->dies = reader.comp_unit_die; 9266 /* comp_unit_die is not stored in die_hash, no need. */ 9267 9268 /* We try not to read any attributes in this function, because not 9269 all CUs needed for references have been loaded yet, and symbol 9270 table processing isn't initialized. But we have to set the CU language, 9271 or we won't be able to build types correctly. 9272 Similarly, if we do not read the producer, we can not apply 9273 producer-specific interpretation. */ 9274 prepare_one_comp_unit (cu, cu->dies, pretend_language); 9275 9276 reader.keep (); 9277 } 9278 9279 /* Add a DIE to the delayed physname list. */ 9280 9281 static void 9282 add_to_method_list (struct type *type, int fnfield_index, int index, 9283 const char *name, struct die_info *die, 9284 struct dwarf2_cu *cu) 9285 { 9286 struct delayed_method_info mi; 9287 mi.type = type; 9288 mi.fnfield_index = fnfield_index; 9289 mi.index = index; 9290 mi.name = name; 9291 mi.die = die; 9292 cu->method_list.push_back (mi); 9293 } 9294 9295 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like 9296 "const" / "volatile". If so, decrements LEN by the length of the 9297 modifier and return true. Otherwise return false. */ 9298 9299 template<size_t N> 9300 static bool 9301 check_modifier (const char *physname, size_t &len, const char (&mod)[N]) 9302 { 9303 size_t mod_len = sizeof (mod) - 1; 9304 if (len > mod_len && startswith (physname + (len - mod_len), mod)) 9305 { 9306 len -= mod_len; 9307 return true; 9308 } 9309 return false; 9310 } 9311 9312 /* Compute the physnames of any methods on the CU's method list. 9313 9314 The computation of method physnames is delayed in order to avoid the 9315 (bad) condition that one of the method's formal parameters is of an as yet 9316 incomplete type. */ 9317 9318 static void 9319 compute_delayed_physnames (struct dwarf2_cu *cu) 9320 { 9321 /* Only C++ delays computing physnames. */ 9322 if (cu->method_list.empty ()) 9323 return; 9324 gdb_assert (cu->language == language_cplus); 9325 9326 for (const delayed_method_info &mi : cu->method_list) 9327 { 9328 const char *physname; 9329 struct fn_fieldlist *fn_flp 9330 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index); 9331 physname = dwarf2_physname (mi.name, mi.die, cu); 9332 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index) 9333 = physname ? physname : ""; 9334 9335 /* Since there's no tag to indicate whether a method is a 9336 const/volatile overload, extract that information out of the 9337 demangled name. */ 9338 if (physname != NULL) 9339 { 9340 size_t len = strlen (physname); 9341 9342 while (1) 9343 { 9344 if (physname[len] == ')') /* shortcut */ 9345 break; 9346 else if (check_modifier (physname, len, " const")) 9347 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1; 9348 else if (check_modifier (physname, len, " volatile")) 9349 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1; 9350 else 9351 break; 9352 } 9353 } 9354 } 9355 9356 /* The list is no longer needed. */ 9357 cu->method_list.clear (); 9358 } 9359 9360 /* Go objects should be embedded in a DW_TAG_module DIE, 9361 and it's not clear if/how imported objects will appear. 9362 To keep Go support simple until that's worked out, 9363 go back through what we've read and create something usable. 9364 We could do this while processing each DIE, and feels kinda cleaner, 9365 but that way is more invasive. 9366 This is to, for example, allow the user to type "p var" or "b main" 9367 without having to specify the package name, and allow lookups 9368 of module.object to work in contexts that use the expression 9369 parser. */ 9370 9371 static void 9372 fixup_go_packaging (struct dwarf2_cu *cu) 9373 { 9374 gdb::unique_xmalloc_ptr<char> package_name; 9375 struct pending *list; 9376 int i; 9377 9378 for (list = *cu->get_builder ()->get_global_symbols (); 9379 list != NULL; 9380 list = list->next) 9381 { 9382 for (i = 0; i < list->nsyms; ++i) 9383 { 9384 struct symbol *sym = list->symbol[i]; 9385 9386 if (sym->language () == language_go 9387 && SYMBOL_CLASS (sym) == LOC_BLOCK) 9388 { 9389 gdb::unique_xmalloc_ptr<char> this_package_name 9390 (go_symbol_package_name (sym)); 9391 9392 if (this_package_name == NULL) 9393 continue; 9394 if (package_name == NULL) 9395 package_name = std::move (this_package_name); 9396 else 9397 { 9398 struct objfile *objfile = cu->per_objfile->objfile; 9399 if (strcmp (package_name.get (), this_package_name.get ()) != 0) 9400 complaint (_("Symtab %s has objects from two different Go packages: %s and %s"), 9401 (symbol_symtab (sym) != NULL 9402 ? symtab_to_filename_for_display 9403 (symbol_symtab (sym)) 9404 : objfile_name (objfile)), 9405 this_package_name.get (), package_name.get ()); 9406 } 9407 } 9408 } 9409 } 9410 9411 if (package_name != NULL) 9412 { 9413 struct objfile *objfile = cu->per_objfile->objfile; 9414 const char *saved_package_name = objfile->intern (package_name.get ()); 9415 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0, 9416 saved_package_name); 9417 struct symbol *sym; 9418 9419 sym = new (&objfile->objfile_obstack) symbol; 9420 sym->set_language (language_go, &objfile->objfile_obstack); 9421 sym->compute_and_set_names (saved_package_name, false, objfile->per_bfd); 9422 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of, 9423 e.g., "main" finds the "main" module and not C's main(). */ 9424 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; 9425 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; 9426 SYMBOL_TYPE (sym) = type; 9427 9428 add_symbol_to_list (sym, cu->get_builder ()->get_global_symbols ()); 9429 } 9430 } 9431 9432 /* Allocate a fully-qualified name consisting of the two parts on the 9433 obstack. */ 9434 9435 static const char * 9436 rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2) 9437 { 9438 return obconcat (obstack, p1, "::", p2, (char *) NULL); 9439 } 9440 9441 /* A helper that allocates a variant part to attach to a Rust enum 9442 type. OBSTACK is where the results should be allocated. TYPE is 9443 the type we're processing. DISCRIMINANT_INDEX is the index of the 9444 discriminant. It must be the index of one of the fields of TYPE, 9445 or -1 to mean there is no discriminant (univariant enum). 9446 DEFAULT_INDEX is the index of the default field; or -1 if there is 9447 no default. RANGES is indexed by "effective" field number (the 9448 field index, but omitting the discriminant and default fields) and 9449 must hold the discriminant values used by the variants. Note that 9450 RANGES must have a lifetime at least as long as OBSTACK -- either 9451 already allocated on it, or static. */ 9452 9453 static void 9454 alloc_rust_variant (struct obstack *obstack, struct type *type, 9455 int discriminant_index, int default_index, 9456 gdb::array_view<discriminant_range> ranges) 9457 { 9458 /* When DISCRIMINANT_INDEX == -1, we have a univariant enum. */ 9459 gdb_assert (discriminant_index == -1 9460 || (discriminant_index >= 0 9461 && discriminant_index < type->num_fields ())); 9462 gdb_assert (default_index == -1 9463 || (default_index >= 0 && default_index < type->num_fields ())); 9464 9465 /* We have one variant for each non-discriminant field. */ 9466 int n_variants = type->num_fields (); 9467 if (discriminant_index != -1) 9468 --n_variants; 9469 9470 variant *variants = new (obstack) variant[n_variants]; 9471 int var_idx = 0; 9472 int range_idx = 0; 9473 for (int i = 0; i < type->num_fields (); ++i) 9474 { 9475 if (i == discriminant_index) 9476 continue; 9477 9478 variants[var_idx].first_field = i; 9479 variants[var_idx].last_field = i + 1; 9480 9481 /* The default field does not need a range, but other fields do. 9482 We skipped the discriminant above. */ 9483 if (i != default_index) 9484 { 9485 variants[var_idx].discriminants = ranges.slice (range_idx, 1); 9486 ++range_idx; 9487 } 9488 9489 ++var_idx; 9490 } 9491 9492 gdb_assert (range_idx == ranges.size ()); 9493 gdb_assert (var_idx == n_variants); 9494 9495 variant_part *part = new (obstack) variant_part; 9496 part->discriminant_index = discriminant_index; 9497 /* If there is no discriminant, then whether it is signed is of no 9498 consequence. */ 9499 part->is_unsigned 9500 = (discriminant_index == -1 9501 ? false 9502 : TYPE_UNSIGNED (type->field (discriminant_index).type ())); 9503 part->variants = gdb::array_view<variant> (variants, n_variants); 9504 9505 void *storage = obstack_alloc (obstack, sizeof (gdb::array_view<variant_part>)); 9506 gdb::array_view<variant_part> *prop_value 9507 = new (storage) gdb::array_view<variant_part> (part, 1); 9508 9509 struct dynamic_prop prop; 9510 prop.set_variant_parts (prop_value); 9511 9512 type->add_dyn_prop (DYN_PROP_VARIANT_PARTS, prop); 9513 } 9514 9515 /* Some versions of rustc emitted enums in an unusual way. 9516 9517 Ordinary enums were emitted as unions. The first element of each 9518 structure in the union was named "RUST$ENUM$DISR". This element 9519 held the discriminant. 9520 9521 These versions of Rust also implemented the "non-zero" 9522 optimization. When the enum had two values, and one is empty and 9523 the other holds a pointer that cannot be zero, the pointer is used 9524 as the discriminant, with a zero value meaning the empty variant. 9525 Here, the union's first member is of the form 9526 RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname> 9527 where the fieldnos are the indices of the fields that should be 9528 traversed in order to find the field (which may be several fields deep) 9529 and the variantname is the name of the variant of the case when the 9530 field is zero. 9531 9532 This function recognizes whether TYPE is of one of these forms, 9533 and, if so, smashes it to be a variant type. */ 9534 9535 static void 9536 quirk_rust_enum (struct type *type, struct objfile *objfile) 9537 { 9538 gdb_assert (type->code () == TYPE_CODE_UNION); 9539 9540 /* We don't need to deal with empty enums. */ 9541 if (type->num_fields () == 0) 9542 return; 9543 9544 #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$" 9545 if (type->num_fields () == 1 9546 && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX)) 9547 { 9548 const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX); 9549 9550 /* Decode the field name to find the offset of the 9551 discriminant. */ 9552 ULONGEST bit_offset = 0; 9553 struct type *field_type = type->field (0).type (); 9554 while (name[0] >= '0' && name[0] <= '9') 9555 { 9556 char *tail; 9557 unsigned long index = strtoul (name, &tail, 10); 9558 name = tail; 9559 if (*name != '$' 9560 || index >= field_type->num_fields () 9561 || (TYPE_FIELD_LOC_KIND (field_type, index) 9562 != FIELD_LOC_KIND_BITPOS)) 9563 { 9564 complaint (_("Could not parse Rust enum encoding string \"%s\"" 9565 "[in module %s]"), 9566 TYPE_FIELD_NAME (type, 0), 9567 objfile_name (objfile)); 9568 return; 9569 } 9570 ++name; 9571 9572 bit_offset += TYPE_FIELD_BITPOS (field_type, index); 9573 field_type = field_type->field (index).type (); 9574 } 9575 9576 /* Smash this type to be a structure type. We have to do this 9577 because the type has already been recorded. */ 9578 type->set_code (TYPE_CODE_STRUCT); 9579 type->set_num_fields (3); 9580 /* Save the field we care about. */ 9581 struct field saved_field = type->field (0); 9582 type->set_fields 9583 ((struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field))); 9584 9585 /* Put the discriminant at index 0. */ 9586 type->field (0).set_type (field_type); 9587 TYPE_FIELD_ARTIFICIAL (type, 0) = 1; 9588 TYPE_FIELD_NAME (type, 0) = "<<discriminant>>"; 9589 SET_FIELD_BITPOS (type->field (0), bit_offset); 9590 9591 /* The order of fields doesn't really matter, so put the real 9592 field at index 1 and the data-less field at index 2. */ 9593 type->field (1) = saved_field; 9594 TYPE_FIELD_NAME (type, 1) 9595 = rust_last_path_segment (type->field (1).type ()->name ()); 9596 type->field (1).type ()->set_name 9597 (rust_fully_qualify (&objfile->objfile_obstack, type->name (), 9598 TYPE_FIELD_NAME (type, 1))); 9599 9600 const char *dataless_name 9601 = rust_fully_qualify (&objfile->objfile_obstack, type->name (), 9602 name); 9603 struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0, 9604 dataless_name); 9605 type->field (2).set_type (dataless_type); 9606 /* NAME points into the original discriminant name, which 9607 already has the correct lifetime. */ 9608 TYPE_FIELD_NAME (type, 2) = name; 9609 SET_FIELD_BITPOS (type->field (2), 0); 9610 9611 /* Indicate that this is a variant type. */ 9612 static discriminant_range ranges[1] = { { 0, 0 } }; 9613 alloc_rust_variant (&objfile->objfile_obstack, type, 0, 1, ranges); 9614 } 9615 /* A union with a single anonymous field is probably an old-style 9616 univariant enum. */ 9617 else if (type->num_fields () == 1 && streq (TYPE_FIELD_NAME (type, 0), "")) 9618 { 9619 /* Smash this type to be a structure type. We have to do this 9620 because the type has already been recorded. */ 9621 type->set_code (TYPE_CODE_STRUCT); 9622 9623 struct type *field_type = type->field (0).type (); 9624 const char *variant_name 9625 = rust_last_path_segment (field_type->name ()); 9626 TYPE_FIELD_NAME (type, 0) = variant_name; 9627 field_type->set_name 9628 (rust_fully_qualify (&objfile->objfile_obstack, 9629 type->name (), variant_name)); 9630 9631 alloc_rust_variant (&objfile->objfile_obstack, type, -1, 0, {}); 9632 } 9633 else 9634 { 9635 struct type *disr_type = nullptr; 9636 for (int i = 0; i < type->num_fields (); ++i) 9637 { 9638 disr_type = type->field (i).type (); 9639 9640 if (disr_type->code () != TYPE_CODE_STRUCT) 9641 { 9642 /* All fields of a true enum will be structs. */ 9643 return; 9644 } 9645 else if (disr_type->num_fields () == 0) 9646 { 9647 /* Could be data-less variant, so keep going. */ 9648 disr_type = nullptr; 9649 } 9650 else if (strcmp (TYPE_FIELD_NAME (disr_type, 0), 9651 "RUST$ENUM$DISR") != 0) 9652 { 9653 /* Not a Rust enum. */ 9654 return; 9655 } 9656 else 9657 { 9658 /* Found one. */ 9659 break; 9660 } 9661 } 9662 9663 /* If we got here without a discriminant, then it's probably 9664 just a union. */ 9665 if (disr_type == nullptr) 9666 return; 9667 9668 /* Smash this type to be a structure type. We have to do this 9669 because the type has already been recorded. */ 9670 type->set_code (TYPE_CODE_STRUCT); 9671 9672 /* Make space for the discriminant field. */ 9673 struct field *disr_field = &disr_type->field (0); 9674 field *new_fields 9675 = (struct field *) TYPE_ZALLOC (type, ((type->num_fields () + 1) 9676 * sizeof (struct field))); 9677 memcpy (new_fields + 1, type->fields (), 9678 type->num_fields () * sizeof (struct field)); 9679 type->set_fields (new_fields); 9680 type->set_num_fields (type->num_fields () + 1); 9681 9682 /* Install the discriminant at index 0 in the union. */ 9683 type->field (0) = *disr_field; 9684 TYPE_FIELD_ARTIFICIAL (type, 0) = 1; 9685 TYPE_FIELD_NAME (type, 0) = "<<discriminant>>"; 9686 9687 /* We need a way to find the correct discriminant given a 9688 variant name. For convenience we build a map here. */ 9689 struct type *enum_type = disr_field->type (); 9690 std::unordered_map<std::string, ULONGEST> discriminant_map; 9691 for (int i = 0; i < enum_type->num_fields (); ++i) 9692 { 9693 if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL) 9694 { 9695 const char *name 9696 = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i)); 9697 discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i); 9698 } 9699 } 9700 9701 int n_fields = type->num_fields (); 9702 /* We don't need a range entry for the discriminant, but we do 9703 need one for every other field, as there is no default 9704 variant. */ 9705 discriminant_range *ranges = XOBNEWVEC (&objfile->objfile_obstack, 9706 discriminant_range, 9707 n_fields - 1); 9708 /* Skip the discriminant here. */ 9709 for (int i = 1; i < n_fields; ++i) 9710 { 9711 /* Find the final word in the name of this variant's type. 9712 That name can be used to look up the correct 9713 discriminant. */ 9714 const char *variant_name 9715 = rust_last_path_segment (type->field (i).type ()->name ()); 9716 9717 auto iter = discriminant_map.find (variant_name); 9718 if (iter != discriminant_map.end ()) 9719 { 9720 ranges[i - 1].low = iter->second; 9721 ranges[i - 1].high = iter->second; 9722 } 9723 9724 /* In Rust, each element should have the size of the 9725 enclosing enum. */ 9726 TYPE_LENGTH (type->field (i).type ()) = TYPE_LENGTH (type); 9727 9728 /* Remove the discriminant field, if it exists. */ 9729 struct type *sub_type = type->field (i).type (); 9730 if (sub_type->num_fields () > 0) 9731 { 9732 sub_type->set_num_fields (sub_type->num_fields () - 1); 9733 sub_type->set_fields (sub_type->fields () + 1); 9734 } 9735 TYPE_FIELD_NAME (type, i) = variant_name; 9736 sub_type->set_name 9737 (rust_fully_qualify (&objfile->objfile_obstack, 9738 type->name (), variant_name)); 9739 } 9740 9741 /* Indicate that this is a variant type. */ 9742 alloc_rust_variant (&objfile->objfile_obstack, type, 0, -1, 9743 gdb::array_view<discriminant_range> (ranges, 9744 n_fields - 1)); 9745 } 9746 } 9747 9748 /* Rewrite some Rust unions to be structures with variants parts. */ 9749 9750 static void 9751 rust_union_quirks (struct dwarf2_cu *cu) 9752 { 9753 gdb_assert (cu->language == language_rust); 9754 for (type *type_ : cu->rust_unions) 9755 quirk_rust_enum (type_, cu->per_objfile->objfile); 9756 /* We don't need this any more. */ 9757 cu->rust_unions.clear (); 9758 } 9759 9760 /* See read.h. */ 9761 9762 type_unit_group_unshareable * 9763 dwarf2_per_objfile::get_type_unit_group_unshareable (type_unit_group *tu_group) 9764 { 9765 auto iter = this->m_type_units.find (tu_group); 9766 if (iter != this->m_type_units.end ()) 9767 return iter->second.get (); 9768 9769 type_unit_group_unshareable_up uniq (new type_unit_group_unshareable); 9770 type_unit_group_unshareable *result = uniq.get (); 9771 this->m_type_units[tu_group] = std::move (uniq); 9772 return result; 9773 } 9774 9775 struct type * 9776 dwarf2_per_objfile::get_type_for_signatured_type 9777 (signatured_type *sig_type) const 9778 { 9779 auto iter = this->m_type_map.find (sig_type); 9780 if (iter == this->m_type_map.end ()) 9781 return nullptr; 9782 9783 return iter->second; 9784 } 9785 9786 void dwarf2_per_objfile::set_type_for_signatured_type 9787 (signatured_type *sig_type, struct type *type) 9788 { 9789 gdb_assert (this->m_type_map.find (sig_type) == this->m_type_map.end ()); 9790 9791 this->m_type_map[sig_type] = type; 9792 } 9793 9794 /* A helper function for computing the list of all symbol tables 9795 included by PER_CU. */ 9796 9797 static void 9798 recursively_compute_inclusions (std::vector<compunit_symtab *> *result, 9799 htab_t all_children, htab_t all_type_symtabs, 9800 dwarf2_per_cu_data *per_cu, 9801 dwarf2_per_objfile *per_objfile, 9802 struct compunit_symtab *immediate_parent) 9803 { 9804 void **slot = htab_find_slot (all_children, per_cu, INSERT); 9805 if (*slot != NULL) 9806 { 9807 /* This inclusion and its children have been processed. */ 9808 return; 9809 } 9810 9811 *slot = per_cu; 9812 9813 /* Only add a CU if it has a symbol table. */ 9814 compunit_symtab *cust = per_objfile->get_symtab (per_cu); 9815 if (cust != NULL) 9816 { 9817 /* If this is a type unit only add its symbol table if we haven't 9818 seen it yet (type unit per_cu's can share symtabs). */ 9819 if (per_cu->is_debug_types) 9820 { 9821 slot = htab_find_slot (all_type_symtabs, cust, INSERT); 9822 if (*slot == NULL) 9823 { 9824 *slot = cust; 9825 result->push_back (cust); 9826 if (cust->user == NULL) 9827 cust->user = immediate_parent; 9828 } 9829 } 9830 else 9831 { 9832 result->push_back (cust); 9833 if (cust->user == NULL) 9834 cust->user = immediate_parent; 9835 } 9836 } 9837 9838 if (!per_cu->imported_symtabs_empty ()) 9839 for (dwarf2_per_cu_data *ptr : *per_cu->imported_symtabs) 9840 { 9841 recursively_compute_inclusions (result, all_children, 9842 all_type_symtabs, ptr, per_objfile, 9843 cust); 9844 } 9845 } 9846 9847 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of 9848 PER_CU. */ 9849 9850 static void 9851 compute_compunit_symtab_includes (dwarf2_per_cu_data *per_cu, 9852 dwarf2_per_objfile *per_objfile) 9853 { 9854 gdb_assert (! per_cu->is_debug_types); 9855 9856 if (!per_cu->imported_symtabs_empty ()) 9857 { 9858 int len; 9859 std::vector<compunit_symtab *> result_symtabs; 9860 htab_t all_children, all_type_symtabs; 9861 compunit_symtab *cust = per_objfile->get_symtab (per_cu); 9862 9863 /* If we don't have a symtab, we can just skip this case. */ 9864 if (cust == NULL) 9865 return; 9866 9867 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer, 9868 NULL, xcalloc, xfree); 9869 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer, 9870 NULL, xcalloc, xfree); 9871 9872 for (dwarf2_per_cu_data *ptr : *per_cu->imported_symtabs) 9873 { 9874 recursively_compute_inclusions (&result_symtabs, all_children, 9875 all_type_symtabs, ptr, per_objfile, 9876 cust); 9877 } 9878 9879 /* Now we have a transitive closure of all the included symtabs. */ 9880 len = result_symtabs.size (); 9881 cust->includes 9882 = XOBNEWVEC (&per_objfile->objfile->objfile_obstack, 9883 struct compunit_symtab *, len + 1); 9884 memcpy (cust->includes, result_symtabs.data (), 9885 len * sizeof (compunit_symtab *)); 9886 cust->includes[len] = NULL; 9887 9888 htab_delete (all_children); 9889 htab_delete (all_type_symtabs); 9890 } 9891 } 9892 9893 /* Compute the 'includes' field for the symtabs of all the CUs we just 9894 read. */ 9895 9896 static void 9897 process_cu_includes (dwarf2_per_objfile *per_objfile) 9898 { 9899 for (dwarf2_per_cu_data *iter : per_objfile->per_bfd->just_read_cus) 9900 { 9901 if (! iter->is_debug_types) 9902 compute_compunit_symtab_includes (iter, per_objfile); 9903 } 9904 9905 per_objfile->per_bfd->just_read_cus.clear (); 9906 } 9907 9908 /* Generate full symbol information for CU, whose DIEs have 9909 already been loaded into memory. */ 9910 9911 static void 9912 process_full_comp_unit (dwarf2_cu *cu, enum language pretend_language) 9913 { 9914 dwarf2_per_objfile *per_objfile = cu->per_objfile; 9915 struct objfile *objfile = per_objfile->objfile; 9916 struct gdbarch *gdbarch = objfile->arch (); 9917 CORE_ADDR lowpc, highpc; 9918 struct compunit_symtab *cust; 9919 CORE_ADDR baseaddr; 9920 struct block *static_block; 9921 CORE_ADDR addr; 9922 9923 baseaddr = objfile->text_section_offset (); 9924 9925 /* Clear the list here in case something was left over. */ 9926 cu->method_list.clear (); 9927 9928 cu->language = pretend_language; 9929 cu->language_defn = language_def (cu->language); 9930 9931 /* Do line number decoding in read_file_scope () */ 9932 process_die (cu->dies, cu); 9933 9934 /* For now fudge the Go package. */ 9935 if (cu->language == language_go) 9936 fixup_go_packaging (cu); 9937 9938 /* Now that we have processed all the DIEs in the CU, all the types 9939 should be complete, and it should now be safe to compute all of the 9940 physnames. */ 9941 compute_delayed_physnames (cu); 9942 9943 if (cu->language == language_rust) 9944 rust_union_quirks (cu); 9945 9946 /* Some compilers don't define a DW_AT_high_pc attribute for the 9947 compilation unit. If the DW_AT_high_pc is missing, synthesize 9948 it, by scanning the DIE's below the compilation unit. */ 9949 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu); 9950 9951 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); 9952 static_block = cu->get_builder ()->end_symtab_get_static_block (addr, 0, 1); 9953 9954 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges. 9955 Also, DW_AT_ranges may record ranges not belonging to any child DIEs 9956 (such as virtual method tables). Record the ranges in STATIC_BLOCK's 9957 addrmap to help ensure it has an accurate map of pc values belonging to 9958 this comp unit. */ 9959 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu); 9960 9961 cust = cu->get_builder ()->end_symtab_from_static_block (static_block, 9962 SECT_OFF_TEXT (objfile), 9963 0); 9964 9965 if (cust != NULL) 9966 { 9967 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer); 9968 9969 /* Set symtab language to language from DW_AT_language. If the 9970 compilation is from a C file generated by language preprocessors, do 9971 not set the language if it was already deduced by start_subfile. */ 9972 if (!(cu->language == language_c 9973 && COMPUNIT_FILETABS (cust)->language != language_unknown)) 9974 COMPUNIT_FILETABS (cust)->language = cu->language; 9975 9976 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can 9977 produce DW_AT_location with location lists but it can be possibly 9978 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0 9979 there were bugs in prologue debug info, fixed later in GCC-4.5 9980 by "unwind info for epilogues" patch (which is not directly related). 9981 9982 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not 9983 needed, it would be wrong due to missing DW_AT_producer there. 9984 9985 Still one can confuse GDB by using non-standard GCC compilation 9986 options - this waits on GCC PR other/32998 (-frecord-gcc-switches). 9987 */ 9988 if (cu->has_loclist && gcc_4_minor >= 5) 9989 cust->locations_valid = 1; 9990 9991 if (gcc_4_minor >= 5) 9992 cust->epilogue_unwind_valid = 1; 9993 9994 cust->call_site_htab = cu->call_site_htab; 9995 } 9996 9997 per_objfile->set_symtab (cu->per_cu, cust); 9998 9999 /* Push it for inclusion processing later. */ 10000 per_objfile->per_bfd->just_read_cus.push_back (cu->per_cu); 10001 10002 /* Not needed any more. */ 10003 cu->reset_builder (); 10004 } 10005 10006 /* Generate full symbol information for type unit CU, whose DIEs have 10007 already been loaded into memory. */ 10008 10009 static void 10010 process_full_type_unit (dwarf2_cu *cu, 10011 enum language pretend_language) 10012 { 10013 dwarf2_per_objfile *per_objfile = cu->per_objfile; 10014 struct objfile *objfile = per_objfile->objfile; 10015 struct compunit_symtab *cust; 10016 struct signatured_type *sig_type; 10017 10018 gdb_assert (cu->per_cu->is_debug_types); 10019 sig_type = (struct signatured_type *) cu->per_cu; 10020 10021 /* Clear the list here in case something was left over. */ 10022 cu->method_list.clear (); 10023 10024 cu->language = pretend_language; 10025 cu->language_defn = language_def (cu->language); 10026 10027 /* The symbol tables are set up in read_type_unit_scope. */ 10028 process_die (cu->dies, cu); 10029 10030 /* For now fudge the Go package. */ 10031 if (cu->language == language_go) 10032 fixup_go_packaging (cu); 10033 10034 /* Now that we have processed all the DIEs in the CU, all the types 10035 should be complete, and it should now be safe to compute all of the 10036 physnames. */ 10037 compute_delayed_physnames (cu); 10038 10039 if (cu->language == language_rust) 10040 rust_union_quirks (cu); 10041 10042 /* TUs share symbol tables. 10043 If this is the first TU to use this symtab, complete the construction 10044 of it with end_expandable_symtab. Otherwise, complete the addition of 10045 this TU's symbols to the existing symtab. */ 10046 type_unit_group_unshareable *tug_unshare = 10047 per_objfile->get_type_unit_group_unshareable (sig_type->type_unit_group); 10048 if (tug_unshare->compunit_symtab == NULL) 10049 { 10050 buildsym_compunit *builder = cu->get_builder (); 10051 cust = builder->end_expandable_symtab (0, SECT_OFF_TEXT (objfile)); 10052 tug_unshare->compunit_symtab = cust; 10053 10054 if (cust != NULL) 10055 { 10056 /* Set symtab language to language from DW_AT_language. If the 10057 compilation is from a C file generated by language preprocessors, 10058 do not set the language if it was already deduced by 10059 start_subfile. */ 10060 if (!(cu->language == language_c 10061 && COMPUNIT_FILETABS (cust)->language != language_c)) 10062 COMPUNIT_FILETABS (cust)->language = cu->language; 10063 } 10064 } 10065 else 10066 { 10067 cu->get_builder ()->augment_type_symtab (); 10068 cust = tug_unshare->compunit_symtab; 10069 } 10070 10071 per_objfile->set_symtab (cu->per_cu, cust); 10072 10073 /* Not needed any more. */ 10074 cu->reset_builder (); 10075 } 10076 10077 /* Process an imported unit DIE. */ 10078 10079 static void 10080 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu) 10081 { 10082 struct attribute *attr; 10083 10084 /* For now we don't handle imported units in type units. */ 10085 if (cu->per_cu->is_debug_types) 10086 { 10087 error (_("Dwarf Error: DW_TAG_imported_unit is not" 10088 " supported in type units [in module %s]"), 10089 objfile_name (cu->per_objfile->objfile)); 10090 } 10091 10092 attr = dwarf2_attr (die, DW_AT_import, cu); 10093 if (attr != NULL) 10094 { 10095 sect_offset sect_off = attr->get_ref_die_offset (); 10096 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz); 10097 dwarf2_per_objfile *per_objfile = cu->per_objfile; 10098 dwarf2_per_cu_data *per_cu 10099 = dwarf2_find_containing_comp_unit (sect_off, is_dwz, per_objfile); 10100 10101 /* We're importing a C++ compilation unit with tag DW_TAG_compile_unit 10102 into another compilation unit, at root level. Regard this as a hint, 10103 and ignore it. */ 10104 if (die->parent && die->parent->parent == NULL 10105 && per_cu->unit_type == DW_UT_compile 10106 && per_cu->lang == language_cplus) 10107 return; 10108 10109 /* If necessary, add it to the queue and load its DIEs. */ 10110 if (maybe_queue_comp_unit (cu, per_cu, per_objfile, cu->language)) 10111 load_full_comp_unit (per_cu, per_objfile, false, cu->language); 10112 10113 cu->per_cu->imported_symtabs_push (per_cu); 10114 } 10115 } 10116 10117 /* RAII object that represents a process_die scope: i.e., 10118 starts/finishes processing a DIE. */ 10119 class process_die_scope 10120 { 10121 public: 10122 process_die_scope (die_info *die, dwarf2_cu *cu) 10123 : m_die (die), m_cu (cu) 10124 { 10125 /* We should only be processing DIEs not already in process. */ 10126 gdb_assert (!m_die->in_process); 10127 m_die->in_process = true; 10128 } 10129 10130 ~process_die_scope () 10131 { 10132 m_die->in_process = false; 10133 10134 /* If we're done processing the DIE for the CU that owns the line 10135 header, we don't need the line header anymore. */ 10136 if (m_cu->line_header_die_owner == m_die) 10137 { 10138 delete m_cu->line_header; 10139 m_cu->line_header = NULL; 10140 m_cu->line_header_die_owner = NULL; 10141 } 10142 } 10143 10144 private: 10145 die_info *m_die; 10146 dwarf2_cu *m_cu; 10147 }; 10148 10149 /* Process a die and its children. */ 10150 10151 static void 10152 process_die (struct die_info *die, struct dwarf2_cu *cu) 10153 { 10154 process_die_scope scope (die, cu); 10155 10156 switch (die->tag) 10157 { 10158 case DW_TAG_padding: 10159 break; 10160 case DW_TAG_compile_unit: 10161 case DW_TAG_partial_unit: 10162 read_file_scope (die, cu); 10163 break; 10164 case DW_TAG_type_unit: 10165 read_type_unit_scope (die, cu); 10166 break; 10167 case DW_TAG_subprogram: 10168 /* Nested subprograms in Fortran get a prefix. */ 10169 if (cu->language == language_fortran 10170 && die->parent != NULL 10171 && die->parent->tag == DW_TAG_subprogram) 10172 cu->processing_has_namespace_info = true; 10173 /* Fall through. */ 10174 case DW_TAG_inlined_subroutine: 10175 read_func_scope (die, cu); 10176 break; 10177 case DW_TAG_lexical_block: 10178 case DW_TAG_try_block: 10179 case DW_TAG_catch_block: 10180 read_lexical_block_scope (die, cu); 10181 break; 10182 case DW_TAG_call_site: 10183 case DW_TAG_GNU_call_site: 10184 read_call_site_scope (die, cu); 10185 break; 10186 case DW_TAG_class_type: 10187 case DW_TAG_interface_type: 10188 case DW_TAG_structure_type: 10189 case DW_TAG_union_type: 10190 process_structure_scope (die, cu); 10191 break; 10192 case DW_TAG_enumeration_type: 10193 process_enumeration_scope (die, cu); 10194 break; 10195 10196 /* These dies have a type, but processing them does not create 10197 a symbol or recurse to process the children. Therefore we can 10198 read them on-demand through read_type_die. */ 10199 case DW_TAG_subroutine_type: 10200 case DW_TAG_set_type: 10201 case DW_TAG_array_type: 10202 case DW_TAG_pointer_type: 10203 case DW_TAG_ptr_to_member_type: 10204 case DW_TAG_reference_type: 10205 case DW_TAG_rvalue_reference_type: 10206 case DW_TAG_string_type: 10207 break; 10208 10209 case DW_TAG_base_type: 10210 case DW_TAG_subrange_type: 10211 case DW_TAG_typedef: 10212 /* Add a typedef symbol for the type definition, if it has a 10213 DW_AT_name. */ 10214 new_symbol (die, read_type_die (die, cu), cu); 10215 break; 10216 case DW_TAG_common_block: 10217 read_common_block (die, cu); 10218 break; 10219 case DW_TAG_common_inclusion: 10220 break; 10221 case DW_TAG_namespace: 10222 cu->processing_has_namespace_info = true; 10223 read_namespace (die, cu); 10224 break; 10225 case DW_TAG_module: 10226 cu->processing_has_namespace_info = true; 10227 read_module (die, cu); 10228 break; 10229 case DW_TAG_imported_declaration: 10230 cu->processing_has_namespace_info = true; 10231 if (read_namespace_alias (die, cu)) 10232 break; 10233 /* The declaration is not a global namespace alias. */ 10234 /* Fall through. */ 10235 case DW_TAG_imported_module: 10236 cu->processing_has_namespace_info = true; 10237 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration 10238 || cu->language != language_fortran)) 10239 complaint (_("Tag '%s' has unexpected children"), 10240 dwarf_tag_name (die->tag)); 10241 read_import_statement (die, cu); 10242 break; 10243 10244 case DW_TAG_imported_unit: 10245 process_imported_unit_die (die, cu); 10246 break; 10247 10248 case DW_TAG_variable: 10249 read_variable (die, cu); 10250 break; 10251 10252 default: 10253 new_symbol (die, NULL, cu); 10254 break; 10255 } 10256 } 10257 10258 /* DWARF name computation. */ 10259 10260 /* A helper function for dwarf2_compute_name which determines whether DIE 10261 needs to have the name of the scope prepended to the name listed in the 10262 die. */ 10263 10264 static int 10265 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu) 10266 { 10267 struct attribute *attr; 10268 10269 switch (die->tag) 10270 { 10271 case DW_TAG_namespace: 10272 case DW_TAG_typedef: 10273 case DW_TAG_class_type: 10274 case DW_TAG_interface_type: 10275 case DW_TAG_structure_type: 10276 case DW_TAG_union_type: 10277 case DW_TAG_enumeration_type: 10278 case DW_TAG_enumerator: 10279 case DW_TAG_subprogram: 10280 case DW_TAG_inlined_subroutine: 10281 case DW_TAG_member: 10282 case DW_TAG_imported_declaration: 10283 return 1; 10284 10285 case DW_TAG_variable: 10286 case DW_TAG_constant: 10287 /* We only need to prefix "globally" visible variables. These include 10288 any variable marked with DW_AT_external or any variable that 10289 lives in a namespace. [Variables in anonymous namespaces 10290 require prefixing, but they are not DW_AT_external.] */ 10291 10292 if (dwarf2_attr (die, DW_AT_specification, cu)) 10293 { 10294 struct dwarf2_cu *spec_cu = cu; 10295 10296 return die_needs_namespace (die_specification (die, &spec_cu), 10297 spec_cu); 10298 } 10299 10300 attr = dwarf2_attr (die, DW_AT_external, cu); 10301 if (attr == NULL && die->parent->tag != DW_TAG_namespace 10302 && die->parent->tag != DW_TAG_module) 10303 return 0; 10304 /* A variable in a lexical block of some kind does not need a 10305 namespace, even though in C++ such variables may be external 10306 and have a mangled name. */ 10307 if (die->parent->tag == DW_TAG_lexical_block 10308 || die->parent->tag == DW_TAG_try_block 10309 || die->parent->tag == DW_TAG_catch_block 10310 || die->parent->tag == DW_TAG_subprogram) 10311 return 0; 10312 return 1; 10313 10314 default: 10315 return 0; 10316 } 10317 } 10318 10319 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name 10320 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not 10321 defined for the given DIE. */ 10322 10323 static struct attribute * 10324 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu) 10325 { 10326 struct attribute *attr; 10327 10328 attr = dwarf2_attr (die, DW_AT_linkage_name, cu); 10329 if (attr == NULL) 10330 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); 10331 10332 return attr; 10333 } 10334 10335 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name 10336 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not 10337 defined for the given DIE. */ 10338 10339 static const char * 10340 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu) 10341 { 10342 const char *linkage_name; 10343 10344 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu); 10345 if (linkage_name == NULL) 10346 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu); 10347 10348 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these. 10349 See https://github.com/rust-lang/rust/issues/32925. */ 10350 if (cu->language == language_rust && linkage_name != NULL 10351 && strchr (linkage_name, '{') != NULL) 10352 linkage_name = NULL; 10353 10354 return linkage_name; 10355 } 10356 10357 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero, 10358 compute the physname for the object, which include a method's: 10359 - formal parameters (C++), 10360 - receiver type (Go), 10361 10362 The term "physname" is a bit confusing. 10363 For C++, for example, it is the demangled name. 10364 For Go, for example, it's the mangled name. 10365 10366 For Ada, return the DIE's linkage name rather than the fully qualified 10367 name. PHYSNAME is ignored.. 10368 10369 The result is allocated on the objfile->per_bfd's obstack and 10370 canonicalized. */ 10371 10372 static const char * 10373 dwarf2_compute_name (const char *name, 10374 struct die_info *die, struct dwarf2_cu *cu, 10375 int physname) 10376 { 10377 struct objfile *objfile = cu->per_objfile->objfile; 10378 10379 if (name == NULL) 10380 name = dwarf2_name (die, cu); 10381 10382 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present 10383 but otherwise compute it by typename_concat inside GDB. 10384 FIXME: Actually this is not really true, or at least not always true. 10385 It's all very confusing. compute_and_set_names doesn't try to demangle 10386 Fortran names because there is no mangling standard. So new_symbol 10387 will set the demangled name to the result of dwarf2_full_name, and it is 10388 the demangled name that GDB uses if it exists. */ 10389 if (cu->language == language_ada 10390 || (cu->language == language_fortran && physname)) 10391 { 10392 /* For Ada unit, we prefer the linkage name over the name, as 10393 the former contains the exported name, which the user expects 10394 to be able to reference. Ideally, we want the user to be able 10395 to reference this entity using either natural or linkage name, 10396 but we haven't started looking at this enhancement yet. */ 10397 const char *linkage_name = dw2_linkage_name (die, cu); 10398 10399 if (linkage_name != NULL) 10400 return linkage_name; 10401 } 10402 10403 /* These are the only languages we know how to qualify names in. */ 10404 if (name != NULL 10405 && (cu->language == language_cplus 10406 || cu->language == language_fortran || cu->language == language_d 10407 || cu->language == language_rust)) 10408 { 10409 if (die_needs_namespace (die, cu)) 10410 { 10411 const char *prefix; 10412 const char *canonical_name = NULL; 10413 10414 string_file buf; 10415 10416 prefix = determine_prefix (die, cu); 10417 if (*prefix != '\0') 10418 { 10419 gdb::unique_xmalloc_ptr<char> prefixed_name 10420 (typename_concat (NULL, prefix, name, physname, cu)); 10421 10422 buf.puts (prefixed_name.get ()); 10423 } 10424 else 10425 buf.puts (name); 10426 10427 /* Template parameters may be specified in the DIE's DW_AT_name, or 10428 as children with DW_TAG_template_type_param or 10429 DW_TAG_value_type_param. If the latter, add them to the name 10430 here. If the name already has template parameters, then 10431 skip this step; some versions of GCC emit both, and 10432 it is more efficient to use the pre-computed name. 10433 10434 Something to keep in mind about this process: it is very 10435 unlikely, or in some cases downright impossible, to produce 10436 something that will match the mangled name of a function. 10437 If the definition of the function has the same debug info, 10438 we should be able to match up with it anyway. But fallbacks 10439 using the minimal symbol, for instance to find a method 10440 implemented in a stripped copy of libstdc++, will not work. 10441 If we do not have debug info for the definition, we will have to 10442 match them up some other way. 10443 10444 When we do name matching there is a related problem with function 10445 templates; two instantiated function templates are allowed to 10446 differ only by their return types, which we do not add here. */ 10447 10448 if (cu->language == language_cplus && strchr (name, '<') == NULL) 10449 { 10450 struct attribute *attr; 10451 struct die_info *child; 10452 int first = 1; 10453 10454 die->building_fullname = 1; 10455 10456 for (child = die->child; child != NULL; child = child->sibling) 10457 { 10458 struct type *type; 10459 LONGEST value; 10460 const gdb_byte *bytes; 10461 struct dwarf2_locexpr_baton *baton; 10462 struct value *v; 10463 10464 if (child->tag != DW_TAG_template_type_param 10465 && child->tag != DW_TAG_template_value_param) 10466 continue; 10467 10468 if (first) 10469 { 10470 buf.puts ("<"); 10471 first = 0; 10472 } 10473 else 10474 buf.puts (", "); 10475 10476 attr = dwarf2_attr (child, DW_AT_type, cu); 10477 if (attr == NULL) 10478 { 10479 complaint (_("template parameter missing DW_AT_type")); 10480 buf.puts ("UNKNOWN_TYPE"); 10481 continue; 10482 } 10483 type = die_type (child, cu); 10484 10485 if (child->tag == DW_TAG_template_type_param) 10486 { 10487 c_print_type (type, "", &buf, -1, 0, cu->language, 10488 &type_print_raw_options); 10489 continue; 10490 } 10491 10492 attr = dwarf2_attr (child, DW_AT_const_value, cu); 10493 if (attr == NULL) 10494 { 10495 complaint (_("template parameter missing " 10496 "DW_AT_const_value")); 10497 buf.puts ("UNKNOWN_VALUE"); 10498 continue; 10499 } 10500 10501 dwarf2_const_value_attr (attr, type, name, 10502 &cu->comp_unit_obstack, cu, 10503 &value, &bytes, &baton); 10504 10505 if (TYPE_NOSIGN (type)) 10506 /* GDB prints characters as NUMBER 'CHAR'. If that's 10507 changed, this can use value_print instead. */ 10508 c_printchar (value, type, &buf); 10509 else 10510 { 10511 struct value_print_options opts; 10512 10513 if (baton != NULL) 10514 v = dwarf2_evaluate_loc_desc (type, NULL, 10515 baton->data, 10516 baton->size, 10517 baton->per_cu, 10518 baton->per_objfile); 10519 else if (bytes != NULL) 10520 { 10521 v = allocate_value (type); 10522 memcpy (value_contents_writeable (v), bytes, 10523 TYPE_LENGTH (type)); 10524 } 10525 else 10526 v = value_from_longest (type, value); 10527 10528 /* Specify decimal so that we do not depend on 10529 the radix. */ 10530 get_formatted_print_options (&opts, 'd'); 10531 opts.raw = 1; 10532 value_print (v, &buf, &opts); 10533 release_value (v); 10534 } 10535 } 10536 10537 die->building_fullname = 0; 10538 10539 if (!first) 10540 { 10541 /* Close the argument list, with a space if necessary 10542 (nested templates). */ 10543 if (!buf.empty () && buf.string ().back () == '>') 10544 buf.puts (" >"); 10545 else 10546 buf.puts (">"); 10547 } 10548 } 10549 10550 /* For C++ methods, append formal parameter type 10551 information, if PHYSNAME. */ 10552 10553 if (physname && die->tag == DW_TAG_subprogram 10554 && cu->language == language_cplus) 10555 { 10556 struct type *type = read_type_die (die, cu); 10557 10558 c_type_print_args (type, &buf, 1, cu->language, 10559 &type_print_raw_options); 10560 10561 if (cu->language == language_cplus) 10562 { 10563 /* Assume that an artificial first parameter is 10564 "this", but do not crash if it is not. RealView 10565 marks unnamed (and thus unused) parameters as 10566 artificial; there is no way to differentiate 10567 the two cases. */ 10568 if (type->num_fields () > 0 10569 && TYPE_FIELD_ARTIFICIAL (type, 0) 10570 && type->field (0).type ()->code () == TYPE_CODE_PTR 10571 && TYPE_CONST (TYPE_TARGET_TYPE (type->field (0).type ()))) 10572 buf.puts (" const"); 10573 } 10574 } 10575 10576 const std::string &intermediate_name = buf.string (); 10577 10578 if (cu->language == language_cplus) 10579 canonical_name 10580 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu, 10581 objfile); 10582 10583 /* If we only computed INTERMEDIATE_NAME, or if 10584 INTERMEDIATE_NAME is already canonical, then we need to 10585 intern it. */ 10586 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ()) 10587 name = objfile->intern (intermediate_name); 10588 else 10589 name = canonical_name; 10590 } 10591 } 10592 10593 return name; 10594 } 10595 10596 /* Return the fully qualified name of DIE, based on its DW_AT_name. 10597 If scope qualifiers are appropriate they will be added. The result 10598 will be allocated on the storage_obstack, or NULL if the DIE does 10599 not have a name. NAME may either be from a previous call to 10600 dwarf2_name or NULL. 10601 10602 The output string will be canonicalized (if C++). */ 10603 10604 static const char * 10605 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu) 10606 { 10607 return dwarf2_compute_name (name, die, cu, 0); 10608 } 10609 10610 /* Construct a physname for the given DIE in CU. NAME may either be 10611 from a previous call to dwarf2_name or NULL. The result will be 10612 allocated on the objfile_objstack or NULL if the DIE does not have a 10613 name. 10614 10615 The output string will be canonicalized (if C++). */ 10616 10617 static const char * 10618 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu) 10619 { 10620 struct objfile *objfile = cu->per_objfile->objfile; 10621 const char *retval, *mangled = NULL, *canon = NULL; 10622 int need_copy = 1; 10623 10624 /* In this case dwarf2_compute_name is just a shortcut not building anything 10625 on its own. */ 10626 if (!die_needs_namespace (die, cu)) 10627 return dwarf2_compute_name (name, die, cu, 1); 10628 10629 if (cu->language != language_rust) 10630 mangled = dw2_linkage_name (die, cu); 10631 10632 /* DW_AT_linkage_name is missing in some cases - depend on what GDB 10633 has computed. */ 10634 gdb::unique_xmalloc_ptr<char> demangled; 10635 if (mangled != NULL) 10636 { 10637 10638 if (language_def (cu->language)->la_store_sym_names_in_linkage_form_p) 10639 { 10640 /* Do nothing (do not demangle the symbol name). */ 10641 } 10642 else if (cu->language == language_go) 10643 { 10644 /* This is a lie, but we already lie to the caller new_symbol. 10645 new_symbol assumes we return the mangled name. 10646 This just undoes that lie until things are cleaned up. */ 10647 } 10648 else 10649 { 10650 /* Use DMGL_RET_DROP for C++ template functions to suppress 10651 their return type. It is easier for GDB users to search 10652 for such functions as `name(params)' than `long name(params)'. 10653 In such case the minimal symbol names do not match the full 10654 symbol names but for template functions there is never a need 10655 to look up their definition from their declaration so 10656 the only disadvantage remains the minimal symbol variant 10657 `long name(params)' does not have the proper inferior type. */ 10658 demangled.reset (gdb_demangle (mangled, 10659 (DMGL_PARAMS | DMGL_ANSI 10660 | DMGL_RET_DROP))); 10661 } 10662 if (demangled) 10663 canon = demangled.get (); 10664 else 10665 { 10666 canon = mangled; 10667 need_copy = 0; 10668 } 10669 } 10670 10671 if (canon == NULL || check_physname) 10672 { 10673 const char *physname = dwarf2_compute_name (name, die, cu, 1); 10674 10675 if (canon != NULL && strcmp (physname, canon) != 0) 10676 { 10677 /* It may not mean a bug in GDB. The compiler could also 10678 compute DW_AT_linkage_name incorrectly. But in such case 10679 GDB would need to be bug-to-bug compatible. */ 10680 10681 complaint (_("Computed physname <%s> does not match demangled <%s> " 10682 "(from linkage <%s>) - DIE at %s [in module %s]"), 10683 physname, canon, mangled, sect_offset_str (die->sect_off), 10684 objfile_name (objfile)); 10685 10686 /* Prefer DW_AT_linkage_name (in the CANON form) - when it 10687 is available here - over computed PHYSNAME. It is safer 10688 against both buggy GDB and buggy compilers. */ 10689 10690 retval = canon; 10691 } 10692 else 10693 { 10694 retval = physname; 10695 need_copy = 0; 10696 } 10697 } 10698 else 10699 retval = canon; 10700 10701 if (need_copy) 10702 retval = objfile->intern (retval); 10703 10704 return retval; 10705 } 10706 10707 /* Inspect DIE in CU for a namespace alias. If one exists, record 10708 a new symbol for it. 10709 10710 Returns 1 if a namespace alias was recorded, 0 otherwise. */ 10711 10712 static int 10713 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu) 10714 { 10715 struct attribute *attr; 10716 10717 /* If the die does not have a name, this is not a namespace 10718 alias. */ 10719 attr = dwarf2_attr (die, DW_AT_name, cu); 10720 if (attr != NULL) 10721 { 10722 int num; 10723 struct die_info *d = die; 10724 struct dwarf2_cu *imported_cu = cu; 10725 10726 /* If the compiler has nested DW_AT_imported_declaration DIEs, 10727 keep inspecting DIEs until we hit the underlying import. */ 10728 #define MAX_NESTED_IMPORTED_DECLARATIONS 100 10729 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num) 10730 { 10731 attr = dwarf2_attr (d, DW_AT_import, cu); 10732 if (attr == NULL) 10733 break; 10734 10735 d = follow_die_ref (d, attr, &imported_cu); 10736 if (d->tag != DW_TAG_imported_declaration) 10737 break; 10738 } 10739 10740 if (num == MAX_NESTED_IMPORTED_DECLARATIONS) 10741 { 10742 complaint (_("DIE at %s has too many recursively imported " 10743 "declarations"), sect_offset_str (d->sect_off)); 10744 return 0; 10745 } 10746 10747 if (attr != NULL) 10748 { 10749 struct type *type; 10750 sect_offset sect_off = attr->get_ref_die_offset (); 10751 10752 type = get_die_type_at_offset (sect_off, cu->per_cu, cu->per_objfile); 10753 if (type != NULL && type->code () == TYPE_CODE_NAMESPACE) 10754 { 10755 /* This declaration is a global namespace alias. Add 10756 a symbol for it whose type is the aliased namespace. */ 10757 new_symbol (die, type, cu); 10758 return 1; 10759 } 10760 } 10761 } 10762 10763 return 0; 10764 } 10765 10766 /* Return the using directives repository (global or local?) to use in the 10767 current context for CU. 10768 10769 For Ada, imported declarations can materialize renamings, which *may* be 10770 global. However it is impossible (for now?) in DWARF to distinguish 10771 "external" imported declarations and "static" ones. As all imported 10772 declarations seem to be static in all other languages, make them all CU-wide 10773 global only in Ada. */ 10774 10775 static struct using_direct ** 10776 using_directives (struct dwarf2_cu *cu) 10777 { 10778 if (cu->language == language_ada 10779 && cu->get_builder ()->outermost_context_p ()) 10780 return cu->get_builder ()->get_global_using_directives (); 10781 else 10782 return cu->get_builder ()->get_local_using_directives (); 10783 } 10784 10785 /* Read the import statement specified by the given die and record it. */ 10786 10787 static void 10788 read_import_statement (struct die_info *die, struct dwarf2_cu *cu) 10789 { 10790 struct objfile *objfile = cu->per_objfile->objfile; 10791 struct attribute *import_attr; 10792 struct die_info *imported_die, *child_die; 10793 struct dwarf2_cu *imported_cu; 10794 const char *imported_name; 10795 const char *imported_name_prefix; 10796 const char *canonical_name; 10797 const char *import_alias; 10798 const char *imported_declaration = NULL; 10799 const char *import_prefix; 10800 std::vector<const char *> excludes; 10801 10802 import_attr = dwarf2_attr (die, DW_AT_import, cu); 10803 if (import_attr == NULL) 10804 { 10805 complaint (_("Tag '%s' has no DW_AT_import"), 10806 dwarf_tag_name (die->tag)); 10807 return; 10808 } 10809 10810 imported_cu = cu; 10811 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu); 10812 imported_name = dwarf2_name (imported_die, imported_cu); 10813 if (imported_name == NULL) 10814 { 10815 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524 10816 10817 The import in the following code: 10818 namespace A 10819 { 10820 typedef int B; 10821 } 10822 10823 int main () 10824 { 10825 using A::B; 10826 B b; 10827 return b; 10828 } 10829 10830 ... 10831 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration) 10832 <52> DW_AT_decl_file : 1 10833 <53> DW_AT_decl_line : 6 10834 <54> DW_AT_import : <0x75> 10835 <2><58>: Abbrev Number: 4 (DW_TAG_typedef) 10836 <59> DW_AT_name : B 10837 <5b> DW_AT_decl_file : 1 10838 <5c> DW_AT_decl_line : 2 10839 <5d> DW_AT_type : <0x6e> 10840 ... 10841 <1><75>: Abbrev Number: 7 (DW_TAG_base_type) 10842 <76> DW_AT_byte_size : 4 10843 <77> DW_AT_encoding : 5 (signed) 10844 10845 imports the wrong die ( 0x75 instead of 0x58 ). 10846 This case will be ignored until the gcc bug is fixed. */ 10847 return; 10848 } 10849 10850 /* Figure out the local name after import. */ 10851 import_alias = dwarf2_name (die, cu); 10852 10853 /* Figure out where the statement is being imported to. */ 10854 import_prefix = determine_prefix (die, cu); 10855 10856 /* Figure out what the scope of the imported die is and prepend it 10857 to the name of the imported die. */ 10858 imported_name_prefix = determine_prefix (imported_die, imported_cu); 10859 10860 if (imported_die->tag != DW_TAG_namespace 10861 && imported_die->tag != DW_TAG_module) 10862 { 10863 imported_declaration = imported_name; 10864 canonical_name = imported_name_prefix; 10865 } 10866 else if (strlen (imported_name_prefix) > 0) 10867 canonical_name = obconcat (&objfile->objfile_obstack, 10868 imported_name_prefix, 10869 (cu->language == language_d ? "." : "::"), 10870 imported_name, (char *) NULL); 10871 else 10872 canonical_name = imported_name; 10873 10874 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran) 10875 for (child_die = die->child; child_die && child_die->tag; 10876 child_die = child_die->sibling) 10877 { 10878 /* DWARF-4: A Fortran use statement with a “rename list” may be 10879 represented by an imported module entry with an import attribute 10880 referring to the module and owned entries corresponding to those 10881 entities that are renamed as part of being imported. */ 10882 10883 if (child_die->tag != DW_TAG_imported_declaration) 10884 { 10885 complaint (_("child DW_TAG_imported_declaration expected " 10886 "- DIE at %s [in module %s]"), 10887 sect_offset_str (child_die->sect_off), 10888 objfile_name (objfile)); 10889 continue; 10890 } 10891 10892 import_attr = dwarf2_attr (child_die, DW_AT_import, cu); 10893 if (import_attr == NULL) 10894 { 10895 complaint (_("Tag '%s' has no DW_AT_import"), 10896 dwarf_tag_name (child_die->tag)); 10897 continue; 10898 } 10899 10900 imported_cu = cu; 10901 imported_die = follow_die_ref_or_sig (child_die, import_attr, 10902 &imported_cu); 10903 imported_name = dwarf2_name (imported_die, imported_cu); 10904 if (imported_name == NULL) 10905 { 10906 complaint (_("child DW_TAG_imported_declaration has unknown " 10907 "imported name - DIE at %s [in module %s]"), 10908 sect_offset_str (child_die->sect_off), 10909 objfile_name (objfile)); 10910 continue; 10911 } 10912 10913 excludes.push_back (imported_name); 10914 10915 process_die (child_die, cu); 10916 } 10917 10918 add_using_directive (using_directives (cu), 10919 import_prefix, 10920 canonical_name, 10921 import_alias, 10922 imported_declaration, 10923 excludes, 10924 0, 10925 &objfile->objfile_obstack); 10926 } 10927 10928 /* ICC<14 does not output the required DW_AT_declaration on incomplete 10929 types, but gives them a size of zero. Starting with version 14, 10930 ICC is compatible with GCC. */ 10931 10932 static bool 10933 producer_is_icc_lt_14 (struct dwarf2_cu *cu) 10934 { 10935 if (!cu->checked_producer) 10936 check_producer (cu); 10937 10938 return cu->producer_is_icc_lt_14; 10939 } 10940 10941 /* ICC generates a DW_AT_type for C void functions. This was observed on 10942 ICC 14.0.5.212, and appears to be against the DWARF spec (V5 3.3.2) 10943 which says that void functions should not have a DW_AT_type. */ 10944 10945 static bool 10946 producer_is_icc (struct dwarf2_cu *cu) 10947 { 10948 if (!cu->checked_producer) 10949 check_producer (cu); 10950 10951 return cu->producer_is_icc; 10952 } 10953 10954 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line 10955 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed 10956 this, it was first present in GCC release 4.3.0. */ 10957 10958 static bool 10959 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu) 10960 { 10961 if (!cu->checked_producer) 10962 check_producer (cu); 10963 10964 return cu->producer_is_gcc_lt_4_3; 10965 } 10966 10967 static file_and_directory 10968 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu) 10969 { 10970 file_and_directory res; 10971 10972 /* Find the filename. Do not use dwarf2_name here, since the filename 10973 is not a source language identifier. */ 10974 res.name = dwarf2_string_attr (die, DW_AT_name, cu); 10975 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu); 10976 10977 if (res.comp_dir == NULL 10978 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL 10979 && IS_ABSOLUTE_PATH (res.name)) 10980 { 10981 res.comp_dir_storage = ldirname (res.name); 10982 if (!res.comp_dir_storage.empty ()) 10983 res.comp_dir = res.comp_dir_storage.c_str (); 10984 } 10985 if (res.comp_dir != NULL) 10986 { 10987 /* Irix 6.2 native cc prepends <machine>.: to the compilation 10988 directory, get rid of it. */ 10989 const char *cp = strchr (res.comp_dir, ':'); 10990 10991 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/') 10992 res.comp_dir = cp + 1; 10993 } 10994 10995 if (res.name == NULL) 10996 res.name = "<unknown>"; 10997 10998 return res; 10999 } 11000 11001 /* Handle DW_AT_stmt_list for a compilation unit. 11002 DIE is the DW_TAG_compile_unit die for CU. 11003 COMP_DIR is the compilation directory. LOWPC is passed to 11004 dwarf_decode_lines. See dwarf_decode_lines comments about it. */ 11005 11006 static void 11007 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu, 11008 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */ 11009 { 11010 dwarf2_per_objfile *per_objfile = cu->per_objfile; 11011 struct attribute *attr; 11012 struct line_header line_header_local; 11013 hashval_t line_header_local_hash; 11014 void **slot; 11015 int decode_mapping; 11016 11017 gdb_assert (! cu->per_cu->is_debug_types); 11018 11019 attr = dwarf2_attr (die, DW_AT_stmt_list, cu); 11020 if (attr == NULL) 11021 return; 11022 11023 sect_offset line_offset = (sect_offset) DW_UNSND (attr); 11024 11025 /* The line header hash table is only created if needed (it exists to 11026 prevent redundant reading of the line table for partial_units). 11027 If we're given a partial_unit, we'll need it. If we're given a 11028 compile_unit, then use the line header hash table if it's already 11029 created, but don't create one just yet. */ 11030 11031 if (per_objfile->line_header_hash == NULL 11032 && die->tag == DW_TAG_partial_unit) 11033 { 11034 per_objfile->line_header_hash 11035 .reset (htab_create_alloc (127, line_header_hash_voidp, 11036 line_header_eq_voidp, 11037 free_line_header_voidp, 11038 xcalloc, xfree)); 11039 } 11040 11041 line_header_local.sect_off = line_offset; 11042 line_header_local.offset_in_dwz = cu->per_cu->is_dwz; 11043 line_header_local_hash = line_header_hash (&line_header_local); 11044 if (per_objfile->line_header_hash != NULL) 11045 { 11046 slot = htab_find_slot_with_hash (per_objfile->line_header_hash.get (), 11047 &line_header_local, 11048 line_header_local_hash, NO_INSERT); 11049 11050 /* For DW_TAG_compile_unit we need info like symtab::linetable which 11051 is not present in *SLOT (since if there is something in *SLOT then 11052 it will be for a partial_unit). */ 11053 if (die->tag == DW_TAG_partial_unit && slot != NULL) 11054 { 11055 gdb_assert (*slot != NULL); 11056 cu->line_header = (struct line_header *) *slot; 11057 return; 11058 } 11059 } 11060 11061 /* dwarf_decode_line_header does not yet provide sufficient information. 11062 We always have to call also dwarf_decode_lines for it. */ 11063 line_header_up lh = dwarf_decode_line_header (line_offset, cu); 11064 if (lh == NULL) 11065 return; 11066 11067 cu->line_header = lh.release (); 11068 cu->line_header_die_owner = die; 11069 11070 if (per_objfile->line_header_hash == NULL) 11071 slot = NULL; 11072 else 11073 { 11074 slot = htab_find_slot_with_hash (per_objfile->line_header_hash.get (), 11075 &line_header_local, 11076 line_header_local_hash, INSERT); 11077 gdb_assert (slot != NULL); 11078 } 11079 if (slot != NULL && *slot == NULL) 11080 { 11081 /* This newly decoded line number information unit will be owned 11082 by line_header_hash hash table. */ 11083 *slot = cu->line_header; 11084 cu->line_header_die_owner = NULL; 11085 } 11086 else 11087 { 11088 /* We cannot free any current entry in (*slot) as that struct line_header 11089 may be already used by multiple CUs. Create only temporary decoded 11090 line_header for this CU - it may happen at most once for each line 11091 number information unit. And if we're not using line_header_hash 11092 then this is what we want as well. */ 11093 gdb_assert (die->tag != DW_TAG_partial_unit); 11094 } 11095 decode_mapping = (die->tag != DW_TAG_partial_unit); 11096 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc, 11097 decode_mapping); 11098 11099 } 11100 11101 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */ 11102 11103 static void 11104 read_file_scope (struct die_info *die, struct dwarf2_cu *cu) 11105 { 11106 dwarf2_per_objfile *per_objfile = cu->per_objfile; 11107 struct objfile *objfile = per_objfile->objfile; 11108 struct gdbarch *gdbarch = objfile->arch (); 11109 CORE_ADDR lowpc = ((CORE_ADDR) -1); 11110 CORE_ADDR highpc = ((CORE_ADDR) 0); 11111 struct attribute *attr; 11112 struct die_info *child_die; 11113 CORE_ADDR baseaddr; 11114 11115 prepare_one_comp_unit (cu, die, cu->language); 11116 baseaddr = objfile->text_section_offset (); 11117 11118 get_scope_pc_bounds (die, &lowpc, &highpc, cu); 11119 11120 /* If we didn't find a lowpc, set it to highpc to avoid complaints 11121 from finish_block. */ 11122 if (lowpc == ((CORE_ADDR) -1)) 11123 lowpc = highpc; 11124 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); 11125 11126 file_and_directory fnd = find_file_and_directory (die, cu); 11127 11128 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not 11129 standardised yet. As a workaround for the language detection we fall 11130 back to the DW_AT_producer string. */ 11131 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL) 11132 cu->language = language_opencl; 11133 11134 /* Similar hack for Go. */ 11135 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL) 11136 set_cu_language (DW_LANG_Go, cu); 11137 11138 cu->start_symtab (fnd.name, fnd.comp_dir, lowpc); 11139 11140 /* Decode line number information if present. We do this before 11141 processing child DIEs, so that the line header table is available 11142 for DW_AT_decl_file. */ 11143 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc); 11144 11145 /* Process all dies in compilation unit. */ 11146 if (die->child != NULL) 11147 { 11148 child_die = die->child; 11149 while (child_die && child_die->tag) 11150 { 11151 process_die (child_die, cu); 11152 child_die = child_die->sibling; 11153 } 11154 } 11155 11156 /* Decode macro information, if present. Dwarf 2 macro information 11157 refers to information in the line number info statement program 11158 header, so we can only read it if we've read the header 11159 successfully. */ 11160 attr = dwarf2_attr (die, DW_AT_macros, cu); 11161 if (attr == NULL) 11162 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu); 11163 if (attr && cu->line_header) 11164 { 11165 if (dwarf2_attr (die, DW_AT_macro_info, cu)) 11166 complaint (_("CU refers to both DW_AT_macros and DW_AT_macro_info")); 11167 11168 dwarf_decode_macros (cu, DW_UNSND (attr), 1); 11169 } 11170 else 11171 { 11172 attr = dwarf2_attr (die, DW_AT_macro_info, cu); 11173 if (attr && cu->line_header) 11174 { 11175 unsigned int macro_offset = DW_UNSND (attr); 11176 11177 dwarf_decode_macros (cu, macro_offset, 0); 11178 } 11179 } 11180 } 11181 11182 void 11183 dwarf2_cu::setup_type_unit_groups (struct die_info *die) 11184 { 11185 struct type_unit_group *tu_group; 11186 int first_time; 11187 struct attribute *attr; 11188 unsigned int i; 11189 struct signatured_type *sig_type; 11190 11191 gdb_assert (per_cu->is_debug_types); 11192 sig_type = (struct signatured_type *) per_cu; 11193 11194 attr = dwarf2_attr (die, DW_AT_stmt_list, this); 11195 11196 /* If we're using .gdb_index (includes -readnow) then 11197 per_cu->type_unit_group may not have been set up yet. */ 11198 if (sig_type->type_unit_group == NULL) 11199 sig_type->type_unit_group = get_type_unit_group (this, attr); 11200 tu_group = sig_type->type_unit_group; 11201 11202 /* If we've already processed this stmt_list there's no real need to 11203 do it again, we could fake it and just recreate the part we need 11204 (file name,index -> symtab mapping). If data shows this optimization 11205 is useful we can do it then. */ 11206 type_unit_group_unshareable *tug_unshare 11207 = per_objfile->get_type_unit_group_unshareable (tu_group); 11208 first_time = tug_unshare->compunit_symtab == NULL; 11209 11210 /* We have to handle the case of both a missing DW_AT_stmt_list or bad 11211 debug info. */ 11212 line_header_up lh; 11213 if (attr != NULL) 11214 { 11215 sect_offset line_offset = (sect_offset) DW_UNSND (attr); 11216 lh = dwarf_decode_line_header (line_offset, this); 11217 } 11218 if (lh == NULL) 11219 { 11220 if (first_time) 11221 start_symtab ("", NULL, 0); 11222 else 11223 { 11224 gdb_assert (tug_unshare->symtabs == NULL); 11225 gdb_assert (m_builder == nullptr); 11226 struct compunit_symtab *cust = tug_unshare->compunit_symtab; 11227 m_builder.reset (new struct buildsym_compunit 11228 (COMPUNIT_OBJFILE (cust), "", 11229 COMPUNIT_DIRNAME (cust), 11230 compunit_language (cust), 11231 0, cust)); 11232 list_in_scope = get_builder ()->get_file_symbols (); 11233 } 11234 return; 11235 } 11236 11237 line_header = lh.release (); 11238 line_header_die_owner = die; 11239 11240 if (first_time) 11241 { 11242 struct compunit_symtab *cust = start_symtab ("", NULL, 0); 11243 11244 /* Note: We don't assign tu_group->compunit_symtab yet because we're 11245 still initializing it, and our caller (a few levels up) 11246 process_full_type_unit still needs to know if this is the first 11247 time. */ 11248 11249 tug_unshare->symtabs 11250 = XOBNEWVEC (&COMPUNIT_OBJFILE (cust)->objfile_obstack, 11251 struct symtab *, line_header->file_names_size ()); 11252 11253 auto &file_names = line_header->file_names (); 11254 for (i = 0; i < file_names.size (); ++i) 11255 { 11256 file_entry &fe = file_names[i]; 11257 dwarf2_start_subfile (this, fe.name, 11258 fe.include_dir (line_header)); 11259 buildsym_compunit *b = get_builder (); 11260 if (b->get_current_subfile ()->symtab == NULL) 11261 { 11262 /* NOTE: start_subfile will recognize when it's been 11263 passed a file it has already seen. So we can't 11264 assume there's a simple mapping from 11265 cu->line_header->file_names to subfiles, plus 11266 cu->line_header->file_names may contain dups. */ 11267 b->get_current_subfile ()->symtab 11268 = allocate_symtab (cust, b->get_current_subfile ()->name); 11269 } 11270 11271 fe.symtab = b->get_current_subfile ()->symtab; 11272 tug_unshare->symtabs[i] = fe.symtab; 11273 } 11274 } 11275 else 11276 { 11277 gdb_assert (m_builder == nullptr); 11278 struct compunit_symtab *cust = tug_unshare->compunit_symtab; 11279 m_builder.reset (new struct buildsym_compunit 11280 (COMPUNIT_OBJFILE (cust), "", 11281 COMPUNIT_DIRNAME (cust), 11282 compunit_language (cust), 11283 0, cust)); 11284 list_in_scope = get_builder ()->get_file_symbols (); 11285 11286 auto &file_names = line_header->file_names (); 11287 for (i = 0; i < file_names.size (); ++i) 11288 { 11289 file_entry &fe = file_names[i]; 11290 fe.symtab = tug_unshare->symtabs[i]; 11291 } 11292 } 11293 11294 /* The main symtab is allocated last. Type units don't have DW_AT_name 11295 so they don't have a "real" (so to speak) symtab anyway. 11296 There is later code that will assign the main symtab to all symbols 11297 that don't have one. We need to handle the case of a symbol with a 11298 missing symtab (DW_AT_decl_file) anyway. */ 11299 } 11300 11301 /* Process DW_TAG_type_unit. 11302 For TUs we want to skip the first top level sibling if it's not the 11303 actual type being defined by this TU. In this case the first top 11304 level sibling is there to provide context only. */ 11305 11306 static void 11307 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu) 11308 { 11309 struct die_info *child_die; 11310 11311 prepare_one_comp_unit (cu, die, language_minimal); 11312 11313 /* Initialize (or reinitialize) the machinery for building symtabs. 11314 We do this before processing child DIEs, so that the line header table 11315 is available for DW_AT_decl_file. */ 11316 cu->setup_type_unit_groups (die); 11317 11318 if (die->child != NULL) 11319 { 11320 child_die = die->child; 11321 while (child_die && child_die->tag) 11322 { 11323 process_die (child_die, cu); 11324 child_die = child_die->sibling; 11325 } 11326 } 11327 } 11328 11329 /* DWO/DWP files. 11330 11331 http://gcc.gnu.org/wiki/DebugFission 11332 http://gcc.gnu.org/wiki/DebugFissionDWP 11333 11334 To simplify handling of both DWO files ("object" files with the DWARF info) 11335 and DWP files (a file with the DWOs packaged up into one file), we treat 11336 DWP files as having a collection of virtual DWO files. */ 11337 11338 static hashval_t 11339 hash_dwo_file (const void *item) 11340 { 11341 const struct dwo_file *dwo_file = (const struct dwo_file *) item; 11342 hashval_t hash; 11343 11344 hash = htab_hash_string (dwo_file->dwo_name); 11345 if (dwo_file->comp_dir != NULL) 11346 hash += htab_hash_string (dwo_file->comp_dir); 11347 return hash; 11348 } 11349 11350 static int 11351 eq_dwo_file (const void *item_lhs, const void *item_rhs) 11352 { 11353 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs; 11354 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs; 11355 11356 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0) 11357 return 0; 11358 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL) 11359 return lhs->comp_dir == rhs->comp_dir; 11360 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0; 11361 } 11362 11363 /* Allocate a hash table for DWO files. */ 11364 11365 static htab_up 11366 allocate_dwo_file_hash_table () 11367 { 11368 auto delete_dwo_file = [] (void *item) 11369 { 11370 struct dwo_file *dwo_file = (struct dwo_file *) item; 11371 11372 delete dwo_file; 11373 }; 11374 11375 return htab_up (htab_create_alloc (41, 11376 hash_dwo_file, 11377 eq_dwo_file, 11378 delete_dwo_file, 11379 xcalloc, xfree)); 11380 } 11381 11382 /* Lookup DWO file DWO_NAME. */ 11383 11384 static void ** 11385 lookup_dwo_file_slot (dwarf2_per_objfile *per_objfile, 11386 const char *dwo_name, 11387 const char *comp_dir) 11388 { 11389 struct dwo_file find_entry; 11390 void **slot; 11391 11392 if (per_objfile->per_bfd->dwo_files == NULL) 11393 per_objfile->per_bfd->dwo_files = allocate_dwo_file_hash_table (); 11394 11395 find_entry.dwo_name = dwo_name; 11396 find_entry.comp_dir = comp_dir; 11397 slot = htab_find_slot (per_objfile->per_bfd->dwo_files.get (), &find_entry, 11398 INSERT); 11399 11400 return slot; 11401 } 11402 11403 static hashval_t 11404 hash_dwo_unit (const void *item) 11405 { 11406 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item; 11407 11408 /* This drops the top 32 bits of the id, but is ok for a hash. */ 11409 return dwo_unit->signature; 11410 } 11411 11412 static int 11413 eq_dwo_unit (const void *item_lhs, const void *item_rhs) 11414 { 11415 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs; 11416 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs; 11417 11418 /* The signature is assumed to be unique within the DWO file. 11419 So while object file CU dwo_id's always have the value zero, 11420 that's OK, assuming each object file DWO file has only one CU, 11421 and that's the rule for now. */ 11422 return lhs->signature == rhs->signature; 11423 } 11424 11425 /* Allocate a hash table for DWO CUs,TUs. 11426 There is one of these tables for each of CUs,TUs for each DWO file. */ 11427 11428 static htab_up 11429 allocate_dwo_unit_table () 11430 { 11431 /* Start out with a pretty small number. 11432 Generally DWO files contain only one CU and maybe some TUs. */ 11433 return htab_up (htab_create_alloc (3, 11434 hash_dwo_unit, 11435 eq_dwo_unit, 11436 NULL, xcalloc, xfree)); 11437 } 11438 11439 /* die_reader_func for create_dwo_cu. */ 11440 11441 static void 11442 create_dwo_cu_reader (const struct die_reader_specs *reader, 11443 const gdb_byte *info_ptr, 11444 struct die_info *comp_unit_die, 11445 struct dwo_file *dwo_file, 11446 struct dwo_unit *dwo_unit) 11447 { 11448 struct dwarf2_cu *cu = reader->cu; 11449 sect_offset sect_off = cu->per_cu->sect_off; 11450 struct dwarf2_section_info *section = cu->per_cu->section; 11451 11452 gdb::optional<ULONGEST> signature = lookup_dwo_id (cu, comp_unit_die); 11453 if (!signature.has_value ()) 11454 { 11455 complaint (_("Dwarf Error: debug entry at offset %s is missing" 11456 " its dwo_id [in module %s]"), 11457 sect_offset_str (sect_off), dwo_file->dwo_name); 11458 return; 11459 } 11460 11461 dwo_unit->dwo_file = dwo_file; 11462 dwo_unit->signature = *signature; 11463 dwo_unit->section = section; 11464 dwo_unit->sect_off = sect_off; 11465 dwo_unit->length = cu->per_cu->length; 11466 11467 if (dwarf_read_debug) 11468 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n", 11469 sect_offset_str (sect_off), 11470 hex_string (dwo_unit->signature)); 11471 } 11472 11473 /* Create the dwo_units for the CUs in a DWO_FILE. 11474 Note: This function processes DWO files only, not DWP files. */ 11475 11476 static void 11477 create_cus_hash_table (dwarf2_per_objfile *per_objfile, 11478 dwarf2_cu *cu, struct dwo_file &dwo_file, 11479 dwarf2_section_info §ion, htab_up &cus_htab) 11480 { 11481 struct objfile *objfile = per_objfile->objfile; 11482 dwarf2_per_bfd *per_bfd = per_objfile->per_bfd; 11483 const gdb_byte *info_ptr, *end_ptr; 11484 11485 section.read (objfile); 11486 info_ptr = section.buffer; 11487 11488 if (info_ptr == NULL) 11489 return; 11490 11491 if (dwarf_read_debug) 11492 { 11493 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n", 11494 section.get_name (), 11495 section.get_file_name ()); 11496 } 11497 11498 end_ptr = info_ptr + section.size; 11499 while (info_ptr < end_ptr) 11500 { 11501 struct dwarf2_per_cu_data per_cu; 11502 struct dwo_unit read_unit {}; 11503 struct dwo_unit *dwo_unit; 11504 void **slot; 11505 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer); 11506 11507 memset (&per_cu, 0, sizeof (per_cu)); 11508 per_cu.per_bfd = per_bfd; 11509 per_cu.is_debug_types = 0; 11510 per_cu.sect_off = sect_offset (info_ptr - section.buffer); 11511 per_cu.section = §ion; 11512 11513 cutu_reader reader (&per_cu, per_objfile, cu, &dwo_file); 11514 if (!reader.dummy_p) 11515 create_dwo_cu_reader (&reader, reader.info_ptr, reader.comp_unit_die, 11516 &dwo_file, &read_unit); 11517 info_ptr += per_cu.length; 11518 11519 // If the unit could not be parsed, skip it. 11520 if (read_unit.dwo_file == NULL) 11521 continue; 11522 11523 if (cus_htab == NULL) 11524 cus_htab = allocate_dwo_unit_table (); 11525 11526 dwo_unit = OBSTACK_ZALLOC (&per_bfd->obstack, 11527 struct dwo_unit); 11528 *dwo_unit = read_unit; 11529 slot = htab_find_slot (cus_htab.get (), dwo_unit, INSERT); 11530 gdb_assert (slot != NULL); 11531 if (*slot != NULL) 11532 { 11533 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot; 11534 sect_offset dup_sect_off = dup_cu->sect_off; 11535 11536 complaint (_("debug cu entry at offset %s is duplicate to" 11537 " the entry at offset %s, signature %s"), 11538 sect_offset_str (sect_off), sect_offset_str (dup_sect_off), 11539 hex_string (dwo_unit->signature)); 11540 } 11541 *slot = (void *)dwo_unit; 11542 } 11543 } 11544 11545 /* DWP file .debug_{cu,tu}_index section format: 11546 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP] 11547 [ref: http://dwarfstd.org/doc/DWARF5.pdf, sect 7.3.5 "DWARF Package Files"] 11548 11549 DWP Versions 1 & 2 are older, pre-standard format versions. The first 11550 officially standard DWP format was published with DWARF v5 and is called 11551 Version 5. There are no versions 3 or 4. 11552 11553 DWP Version 1: 11554 11555 Both index sections have the same format, and serve to map a 64-bit 11556 signature to a set of section numbers. Each section begins with a header, 11557 followed by a hash table of 64-bit signatures, a parallel table of 32-bit 11558 indexes, and a pool of 32-bit section numbers. The index sections will be 11559 aligned at 8-byte boundaries in the file. 11560 11561 The index section header consists of: 11562 11563 V, 32 bit version number 11564 -, 32 bits unused 11565 N, 32 bit number of compilation units or type units in the index 11566 M, 32 bit number of slots in the hash table 11567 11568 Numbers are recorded using the byte order of the application binary. 11569 11570 The hash table begins at offset 16 in the section, and consists of an array 11571 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte 11572 order of the application binary). Unused slots in the hash table are 0. 11573 (We rely on the extreme unlikeliness of a signature being exactly 0.) 11574 11575 The parallel table begins immediately after the hash table 11576 (at offset 16 + 8 * M from the beginning of the section), and consists of an 11577 array of 32-bit indexes (using the byte order of the application binary), 11578 corresponding 1-1 with slots in the hash table. Each entry in the parallel 11579 table contains a 32-bit index into the pool of section numbers. For unused 11580 hash table slots, the corresponding entry in the parallel table will be 0. 11581 11582 The pool of section numbers begins immediately following the hash table 11583 (at offset 16 + 12 * M from the beginning of the section). The pool of 11584 section numbers consists of an array of 32-bit words (using the byte order 11585 of the application binary). Each item in the array is indexed starting 11586 from 0. The hash table entry provides the index of the first section 11587 number in the set. Additional section numbers in the set follow, and the 11588 set is terminated by a 0 entry (section number 0 is not used in ELF). 11589 11590 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo 11591 section must be the first entry in the set, and the .debug_abbrev.dwo must 11592 be the second entry. Other members of the set may follow in any order. 11593 11594 --- 11595 11596 DWP Versions 2 and 5: 11597 11598 DWP Versions 2 and 5 combine all the .debug_info, etc. sections into one, 11599 and the entries in the index tables are now offsets into these sections. 11600 CU offsets begin at 0. TU offsets begin at the size of the .debug_info 11601 section. 11602 11603 Index Section Contents: 11604 Header 11605 Hash Table of Signatures dwp_hash_table.hash_table 11606 Parallel Table of Indices dwp_hash_table.unit_table 11607 Table of Section Offsets dwp_hash_table.{v2|v5}.{section_ids,offsets} 11608 Table of Section Sizes dwp_hash_table.{v2|v5}.sizes 11609 11610 The index section header consists of: 11611 11612 V, 32 bit version number 11613 L, 32 bit number of columns in the table of section offsets 11614 N, 32 bit number of compilation units or type units in the index 11615 M, 32 bit number of slots in the hash table 11616 11617 Numbers are recorded using the byte order of the application binary. 11618 11619 The hash table has the same format as version 1. 11620 The parallel table of indices has the same format as version 1, 11621 except that the entries are origin-1 indices into the table of sections 11622 offsets and the table of section sizes. 11623 11624 The table of offsets begins immediately following the parallel table 11625 (at offset 16 + 12 * M from the beginning of the section). The table is 11626 a two-dimensional array of 32-bit words (using the byte order of the 11627 application binary), with L columns and N+1 rows, in row-major order. 11628 Each row in the array is indexed starting from 0. The first row provides 11629 a key to the remaining rows: each column in this row provides an identifier 11630 for a debug section, and the offsets in the same column of subsequent rows 11631 refer to that section. The section identifiers for Version 2 are: 11632 11633 DW_SECT_INFO 1 .debug_info.dwo 11634 DW_SECT_TYPES 2 .debug_types.dwo 11635 DW_SECT_ABBREV 3 .debug_abbrev.dwo 11636 DW_SECT_LINE 4 .debug_line.dwo 11637 DW_SECT_LOC 5 .debug_loc.dwo 11638 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo 11639 DW_SECT_MACINFO 7 .debug_macinfo.dwo 11640 DW_SECT_MACRO 8 .debug_macro.dwo 11641 11642 The section identifiers for Version 5 are: 11643 11644 DW_SECT_INFO_V5 1 .debug_info.dwo 11645 DW_SECT_RESERVED_V5 2 -- 11646 DW_SECT_ABBREV_V5 3 .debug_abbrev.dwo 11647 DW_SECT_LINE_V5 4 .debug_line.dwo 11648 DW_SECT_LOCLISTS_V5 5 .debug_loclists.dwo 11649 DW_SECT_STR_OFFSETS_V5 6 .debug_str_offsets.dwo 11650 DW_SECT_MACRO_V5 7 .debug_macro.dwo 11651 DW_SECT_RNGLISTS_V5 8 .debug_rnglists.dwo 11652 11653 The offsets provided by the CU and TU index sections are the base offsets 11654 for the contributions made by each CU or TU to the corresponding section 11655 in the package file. Each CU and TU header contains an abbrev_offset 11656 field, used to find the abbreviations table for that CU or TU within the 11657 contribution to the .debug_abbrev.dwo section for that CU or TU, and should 11658 be interpreted as relative to the base offset given in the index section. 11659 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes 11660 should be interpreted as relative to the base offset for .debug_line.dwo, 11661 and offsets into other debug sections obtained from DWARF attributes should 11662 also be interpreted as relative to the corresponding base offset. 11663 11664 The table of sizes begins immediately following the table of offsets. 11665 Like the table of offsets, it is a two-dimensional array of 32-bit words, 11666 with L columns and N rows, in row-major order. Each row in the array is 11667 indexed starting from 1 (row 0 is shared by the two tables). 11668 11669 --- 11670 11671 Hash table lookup is handled the same in version 1 and 2: 11672 11673 We assume that N and M will not exceed 2^32 - 1. 11674 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2. 11675 11676 Given a 64-bit compilation unit signature or a type signature S, an entry 11677 in the hash table is located as follows: 11678 11679 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with 11680 the low-order k bits all set to 1. 11681 11682 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1). 11683 11684 3) If the hash table entry at index H matches the signature, use that 11685 entry. If the hash table entry at index H is unused (all zeroes), 11686 terminate the search: the signature is not present in the table. 11687 11688 4) Let H = (H + H') modulo M. Repeat at Step 3. 11689 11690 Because M > N and H' and M are relatively prime, the search is guaranteed 11691 to stop at an unused slot or find the match. */ 11692 11693 /* Create a hash table to map DWO IDs to their CU/TU entry in 11694 .debug_{info,types}.dwo in DWP_FILE. 11695 Returns NULL if there isn't one. 11696 Note: This function processes DWP files only, not DWO files. */ 11697 11698 static struct dwp_hash_table * 11699 create_dwp_hash_table (dwarf2_per_objfile *per_objfile, 11700 struct dwp_file *dwp_file, int is_debug_types) 11701 { 11702 struct objfile *objfile = per_objfile->objfile; 11703 bfd *dbfd = dwp_file->dbfd.get (); 11704 const gdb_byte *index_ptr, *index_end; 11705 struct dwarf2_section_info *index; 11706 uint32_t version, nr_columns, nr_units, nr_slots; 11707 struct dwp_hash_table *htab; 11708 11709 if (is_debug_types) 11710 index = &dwp_file->sections.tu_index; 11711 else 11712 index = &dwp_file->sections.cu_index; 11713 11714 if (index->empty ()) 11715 return NULL; 11716 index->read (objfile); 11717 11718 index_ptr = index->buffer; 11719 index_end = index_ptr + index->size; 11720 11721 /* For Version 5, the version is really 2 bytes of data & 2 bytes of padding. 11722 For now it's safe to just read 4 bytes (particularly as it's difficult to 11723 tell if you're dealing with Version 5 before you've read the version). */ 11724 version = read_4_bytes (dbfd, index_ptr); 11725 index_ptr += 4; 11726 if (version == 2 || version == 5) 11727 nr_columns = read_4_bytes (dbfd, index_ptr); 11728 else 11729 nr_columns = 0; 11730 index_ptr += 4; 11731 nr_units = read_4_bytes (dbfd, index_ptr); 11732 index_ptr += 4; 11733 nr_slots = read_4_bytes (dbfd, index_ptr); 11734 index_ptr += 4; 11735 11736 if (version != 1 && version != 2 && version != 5) 11737 { 11738 error (_("Dwarf Error: unsupported DWP file version (%s)" 11739 " [in module %s]"), 11740 pulongest (version), dwp_file->name); 11741 } 11742 if (nr_slots != (nr_slots & -nr_slots)) 11743 { 11744 error (_("Dwarf Error: number of slots in DWP hash table (%s)" 11745 " is not power of 2 [in module %s]"), 11746 pulongest (nr_slots), dwp_file->name); 11747 } 11748 11749 htab = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, struct dwp_hash_table); 11750 htab->version = version; 11751 htab->nr_columns = nr_columns; 11752 htab->nr_units = nr_units; 11753 htab->nr_slots = nr_slots; 11754 htab->hash_table = index_ptr; 11755 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots; 11756 11757 /* Exit early if the table is empty. */ 11758 if (nr_slots == 0 || nr_units == 0 11759 || (version == 2 && nr_columns == 0) 11760 || (version == 5 && nr_columns == 0)) 11761 { 11762 /* All must be zero. */ 11763 if (nr_slots != 0 || nr_units != 0 11764 || (version == 2 && nr_columns != 0) 11765 || (version == 5 && nr_columns != 0)) 11766 { 11767 complaint (_("Empty DWP but nr_slots,nr_units,nr_columns not" 11768 " all zero [in modules %s]"), 11769 dwp_file->name); 11770 } 11771 return htab; 11772 } 11773 11774 if (version == 1) 11775 { 11776 htab->section_pool.v1.indices = 11777 htab->unit_table + sizeof (uint32_t) * nr_slots; 11778 /* It's harder to decide whether the section is too small in v1. 11779 V1 is deprecated anyway so we punt. */ 11780 } 11781 else if (version == 2) 11782 { 11783 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots; 11784 int *ids = htab->section_pool.v2.section_ids; 11785 size_t sizeof_ids = sizeof (htab->section_pool.v2.section_ids); 11786 /* Reverse map for error checking. */ 11787 int ids_seen[DW_SECT_MAX + 1]; 11788 int i; 11789 11790 if (nr_columns < 2) 11791 { 11792 error (_("Dwarf Error: bad DWP hash table, too few columns" 11793 " in section table [in module %s]"), 11794 dwp_file->name); 11795 } 11796 if (nr_columns > MAX_NR_V2_DWO_SECTIONS) 11797 { 11798 error (_("Dwarf Error: bad DWP hash table, too many columns" 11799 " in section table [in module %s]"), 11800 dwp_file->name); 11801 } 11802 memset (ids, 255, sizeof_ids); 11803 memset (ids_seen, 255, sizeof (ids_seen)); 11804 for (i = 0; i < nr_columns; ++i) 11805 { 11806 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t)); 11807 11808 if (id < DW_SECT_MIN || id > DW_SECT_MAX) 11809 { 11810 error (_("Dwarf Error: bad DWP hash table, bad section id %d" 11811 " in section table [in module %s]"), 11812 id, dwp_file->name); 11813 } 11814 if (ids_seen[id] != -1) 11815 { 11816 error (_("Dwarf Error: bad DWP hash table, duplicate section" 11817 " id %d in section table [in module %s]"), 11818 id, dwp_file->name); 11819 } 11820 ids_seen[id] = i; 11821 ids[i] = id; 11822 } 11823 /* Must have exactly one info or types section. */ 11824 if (((ids_seen[DW_SECT_INFO] != -1) 11825 + (ids_seen[DW_SECT_TYPES] != -1)) 11826 != 1) 11827 { 11828 error (_("Dwarf Error: bad DWP hash table, missing/duplicate" 11829 " DWO info/types section [in module %s]"), 11830 dwp_file->name); 11831 } 11832 /* Must have an abbrev section. */ 11833 if (ids_seen[DW_SECT_ABBREV] == -1) 11834 { 11835 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev" 11836 " section [in module %s]"), 11837 dwp_file->name); 11838 } 11839 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns; 11840 htab->section_pool.v2.sizes = 11841 htab->section_pool.v2.offsets + (sizeof (uint32_t) 11842 * nr_units * nr_columns); 11843 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t) 11844 * nr_units * nr_columns)) 11845 > index_end) 11846 { 11847 error (_("Dwarf Error: DWP index section is corrupt (too small)" 11848 " [in module %s]"), 11849 dwp_file->name); 11850 } 11851 } 11852 else /* version == 5 */ 11853 { 11854 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots; 11855 int *ids = htab->section_pool.v5.section_ids; 11856 size_t sizeof_ids = sizeof (htab->section_pool.v5.section_ids); 11857 /* Reverse map for error checking. */ 11858 int ids_seen[DW_SECT_MAX_V5 + 1]; 11859 11860 if (nr_columns < 2) 11861 { 11862 error (_("Dwarf Error: bad DWP hash table, too few columns" 11863 " in section table [in module %s]"), 11864 dwp_file->name); 11865 } 11866 if (nr_columns > MAX_NR_V5_DWO_SECTIONS) 11867 { 11868 error (_("Dwarf Error: bad DWP hash table, too many columns" 11869 " in section table [in module %s]"), 11870 dwp_file->name); 11871 } 11872 memset (ids, 255, sizeof_ids); 11873 memset (ids_seen, 255, sizeof (ids_seen)); 11874 for (int i = 0; i < nr_columns; ++i) 11875 { 11876 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t)); 11877 11878 if (id < DW_SECT_MIN || id > DW_SECT_MAX_V5) 11879 { 11880 error (_("Dwarf Error: bad DWP hash table, bad section id %d" 11881 " in section table [in module %s]"), 11882 id, dwp_file->name); 11883 } 11884 if (ids_seen[id] != -1) 11885 { 11886 error (_("Dwarf Error: bad DWP hash table, duplicate section" 11887 " id %d in section table [in module %s]"), 11888 id, dwp_file->name); 11889 } 11890 ids_seen[id] = i; 11891 ids[i] = id; 11892 } 11893 /* Must have seen an info section. */ 11894 if (ids_seen[DW_SECT_INFO_V5] == -1) 11895 { 11896 error (_("Dwarf Error: bad DWP hash table, missing/duplicate" 11897 " DWO info/types section [in module %s]"), 11898 dwp_file->name); 11899 } 11900 /* Must have an abbrev section. */ 11901 if (ids_seen[DW_SECT_ABBREV_V5] == -1) 11902 { 11903 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev" 11904 " section [in module %s]"), 11905 dwp_file->name); 11906 } 11907 htab->section_pool.v5.offsets = ids_ptr + sizeof (uint32_t) * nr_columns; 11908 htab->section_pool.v5.sizes 11909 = htab->section_pool.v5.offsets + (sizeof (uint32_t) 11910 * nr_units * nr_columns); 11911 if ((htab->section_pool.v5.sizes + (sizeof (uint32_t) 11912 * nr_units * nr_columns)) 11913 > index_end) 11914 { 11915 error (_("Dwarf Error: DWP index section is corrupt (too small)" 11916 " [in module %s]"), 11917 dwp_file->name); 11918 } 11919 } 11920 11921 return htab; 11922 } 11923 11924 /* Update SECTIONS with the data from SECTP. 11925 11926 This function is like the other "locate" section routines that are 11927 passed to bfd_map_over_sections, but in this context the sections to 11928 read comes from the DWP V1 hash table, not the full ELF section table. 11929 11930 The result is non-zero for success, or zero if an error was found. */ 11931 11932 static int 11933 locate_v1_virtual_dwo_sections (asection *sectp, 11934 struct virtual_v1_dwo_sections *sections) 11935 { 11936 const struct dwop_section_names *names = &dwop_section_names; 11937 11938 if (section_is_p (sectp->name, &names->abbrev_dwo)) 11939 { 11940 /* There can be only one. */ 11941 if (sections->abbrev.s.section != NULL) 11942 return 0; 11943 sections->abbrev.s.section = sectp; 11944 sections->abbrev.size = bfd_section_size (sectp); 11945 } 11946 else if (section_is_p (sectp->name, &names->info_dwo) 11947 || section_is_p (sectp->name, &names->types_dwo)) 11948 { 11949 /* There can be only one. */ 11950 if (sections->info_or_types.s.section != NULL) 11951 return 0; 11952 sections->info_or_types.s.section = sectp; 11953 sections->info_or_types.size = bfd_section_size (sectp); 11954 } 11955 else if (section_is_p (sectp->name, &names->line_dwo)) 11956 { 11957 /* There can be only one. */ 11958 if (sections->line.s.section != NULL) 11959 return 0; 11960 sections->line.s.section = sectp; 11961 sections->line.size = bfd_section_size (sectp); 11962 } 11963 else if (section_is_p (sectp->name, &names->loc_dwo)) 11964 { 11965 /* There can be only one. */ 11966 if (sections->loc.s.section != NULL) 11967 return 0; 11968 sections->loc.s.section = sectp; 11969 sections->loc.size = bfd_section_size (sectp); 11970 } 11971 else if (section_is_p (sectp->name, &names->macinfo_dwo)) 11972 { 11973 /* There can be only one. */ 11974 if (sections->macinfo.s.section != NULL) 11975 return 0; 11976 sections->macinfo.s.section = sectp; 11977 sections->macinfo.size = bfd_section_size (sectp); 11978 } 11979 else if (section_is_p (sectp->name, &names->macro_dwo)) 11980 { 11981 /* There can be only one. */ 11982 if (sections->macro.s.section != NULL) 11983 return 0; 11984 sections->macro.s.section = sectp; 11985 sections->macro.size = bfd_section_size (sectp); 11986 } 11987 else if (section_is_p (sectp->name, &names->str_offsets_dwo)) 11988 { 11989 /* There can be only one. */ 11990 if (sections->str_offsets.s.section != NULL) 11991 return 0; 11992 sections->str_offsets.s.section = sectp; 11993 sections->str_offsets.size = bfd_section_size (sectp); 11994 } 11995 else 11996 { 11997 /* No other kind of section is valid. */ 11998 return 0; 11999 } 12000 12001 return 1; 12002 } 12003 12004 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE. 12005 UNIT_INDEX is the index of the DWO unit in the DWP hash table. 12006 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. 12007 This is for DWP version 1 files. */ 12008 12009 static struct dwo_unit * 12010 create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile *per_objfile, 12011 struct dwp_file *dwp_file, 12012 uint32_t unit_index, 12013 const char *comp_dir, 12014 ULONGEST signature, int is_debug_types) 12015 { 12016 const struct dwp_hash_table *dwp_htab = 12017 is_debug_types ? dwp_file->tus : dwp_file->cus; 12018 bfd *dbfd = dwp_file->dbfd.get (); 12019 const char *kind = is_debug_types ? "TU" : "CU"; 12020 struct dwo_file *dwo_file; 12021 struct dwo_unit *dwo_unit; 12022 struct virtual_v1_dwo_sections sections; 12023 void **dwo_file_slot; 12024 int i; 12025 12026 gdb_assert (dwp_file->version == 1); 12027 12028 if (dwarf_read_debug) 12029 { 12030 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n", 12031 kind, 12032 pulongest (unit_index), hex_string (signature), 12033 dwp_file->name); 12034 } 12035 12036 /* Fetch the sections of this DWO unit. 12037 Put a limit on the number of sections we look for so that bad data 12038 doesn't cause us to loop forever. */ 12039 12040 #define MAX_NR_V1_DWO_SECTIONS \ 12041 (1 /* .debug_info or .debug_types */ \ 12042 + 1 /* .debug_abbrev */ \ 12043 + 1 /* .debug_line */ \ 12044 + 1 /* .debug_loc */ \ 12045 + 1 /* .debug_str_offsets */ \ 12046 + 1 /* .debug_macro or .debug_macinfo */ \ 12047 + 1 /* trailing zero */) 12048 12049 memset (§ions, 0, sizeof (sections)); 12050 12051 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i) 12052 { 12053 asection *sectp; 12054 uint32_t section_nr = 12055 read_4_bytes (dbfd, 12056 dwp_htab->section_pool.v1.indices 12057 + (unit_index + i) * sizeof (uint32_t)); 12058 12059 if (section_nr == 0) 12060 break; 12061 if (section_nr >= dwp_file->num_sections) 12062 { 12063 error (_("Dwarf Error: bad DWP hash table, section number too large" 12064 " [in module %s]"), 12065 dwp_file->name); 12066 } 12067 12068 sectp = dwp_file->elf_sections[section_nr]; 12069 if (! locate_v1_virtual_dwo_sections (sectp, §ions)) 12070 { 12071 error (_("Dwarf Error: bad DWP hash table, invalid section found" 12072 " [in module %s]"), 12073 dwp_file->name); 12074 } 12075 } 12076 12077 if (i < 2 12078 || sections.info_or_types.empty () 12079 || sections.abbrev.empty ()) 12080 { 12081 error (_("Dwarf Error: bad DWP hash table, missing DWO sections" 12082 " [in module %s]"), 12083 dwp_file->name); 12084 } 12085 if (i == MAX_NR_V1_DWO_SECTIONS) 12086 { 12087 error (_("Dwarf Error: bad DWP hash table, too many DWO sections" 12088 " [in module %s]"), 12089 dwp_file->name); 12090 } 12091 12092 /* It's easier for the rest of the code if we fake a struct dwo_file and 12093 have dwo_unit "live" in that. At least for now. 12094 12095 The DWP file can be made up of a random collection of CUs and TUs. 12096 However, for each CU + set of TUs that came from the same original DWO 12097 file, we can combine them back into a virtual DWO file to save space 12098 (fewer struct dwo_file objects to allocate). Remember that for really 12099 large apps there can be on the order of 8K CUs and 200K TUs, or more. */ 12100 12101 std::string virtual_dwo_name = 12102 string_printf ("virtual-dwo/%d-%d-%d-%d", 12103 sections.abbrev.get_id (), 12104 sections.line.get_id (), 12105 sections.loc.get_id (), 12106 sections.str_offsets.get_id ()); 12107 /* Can we use an existing virtual DWO file? */ 12108 dwo_file_slot = lookup_dwo_file_slot (per_objfile, virtual_dwo_name.c_str (), 12109 comp_dir); 12110 /* Create one if necessary. */ 12111 if (*dwo_file_slot == NULL) 12112 { 12113 if (dwarf_read_debug) 12114 { 12115 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n", 12116 virtual_dwo_name.c_str ()); 12117 } 12118 dwo_file = new struct dwo_file; 12119 dwo_file->dwo_name = per_objfile->objfile->intern (virtual_dwo_name); 12120 dwo_file->comp_dir = comp_dir; 12121 dwo_file->sections.abbrev = sections.abbrev; 12122 dwo_file->sections.line = sections.line; 12123 dwo_file->sections.loc = sections.loc; 12124 dwo_file->sections.macinfo = sections.macinfo; 12125 dwo_file->sections.macro = sections.macro; 12126 dwo_file->sections.str_offsets = sections.str_offsets; 12127 /* The "str" section is global to the entire DWP file. */ 12128 dwo_file->sections.str = dwp_file->sections.str; 12129 /* The info or types section is assigned below to dwo_unit, 12130 there's no need to record it in dwo_file. 12131 Also, we can't simply record type sections in dwo_file because 12132 we record a pointer into the vector in dwo_unit. As we collect more 12133 types we'll grow the vector and eventually have to reallocate space 12134 for it, invalidating all copies of pointers into the previous 12135 contents. */ 12136 *dwo_file_slot = dwo_file; 12137 } 12138 else 12139 { 12140 if (dwarf_read_debug) 12141 { 12142 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n", 12143 virtual_dwo_name.c_str ()); 12144 } 12145 dwo_file = (struct dwo_file *) *dwo_file_slot; 12146 } 12147 12148 dwo_unit = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, struct dwo_unit); 12149 dwo_unit->dwo_file = dwo_file; 12150 dwo_unit->signature = signature; 12151 dwo_unit->section = 12152 XOBNEW (&per_objfile->per_bfd->obstack, struct dwarf2_section_info); 12153 *dwo_unit->section = sections.info_or_types; 12154 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */ 12155 12156 return dwo_unit; 12157 } 12158 12159 /* Subroutine of create_dwo_unit_in_dwp_v2 and create_dwo_unit_in_dwp_v5 to 12160 simplify them. Given a pointer to the containing section SECTION, and 12161 OFFSET,SIZE of the piece within that section used by a TU/CU, return a 12162 virtual section of just that piece. */ 12163 12164 static struct dwarf2_section_info 12165 create_dwp_v2_or_v5_section (dwarf2_per_objfile *per_objfile, 12166 struct dwarf2_section_info *section, 12167 bfd_size_type offset, bfd_size_type size) 12168 { 12169 struct dwarf2_section_info result; 12170 asection *sectp; 12171 12172 gdb_assert (section != NULL); 12173 gdb_assert (!section->is_virtual); 12174 12175 memset (&result, 0, sizeof (result)); 12176 result.s.containing_section = section; 12177 result.is_virtual = true; 12178 12179 if (size == 0) 12180 return result; 12181 12182 sectp = section->get_bfd_section (); 12183 12184 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the 12185 bounds of the real section. This is a pretty-rare event, so just 12186 flag an error (easier) instead of a warning and trying to cope. */ 12187 if (sectp == NULL 12188 || offset + size > bfd_section_size (sectp)) 12189 { 12190 error (_("Dwarf Error: Bad DWP V2 or V5 section info, doesn't fit" 12191 " in section %s [in module %s]"), 12192 sectp ? bfd_section_name (sectp) : "<unknown>", 12193 objfile_name (per_objfile->objfile)); 12194 } 12195 12196 result.virtual_offset = offset; 12197 result.size = size; 12198 return result; 12199 } 12200 12201 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE. 12202 UNIT_INDEX is the index of the DWO unit in the DWP hash table. 12203 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. 12204 This is for DWP version 2 files. */ 12205 12206 static struct dwo_unit * 12207 create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile *per_objfile, 12208 struct dwp_file *dwp_file, 12209 uint32_t unit_index, 12210 const char *comp_dir, 12211 ULONGEST signature, int is_debug_types) 12212 { 12213 const struct dwp_hash_table *dwp_htab = 12214 is_debug_types ? dwp_file->tus : dwp_file->cus; 12215 bfd *dbfd = dwp_file->dbfd.get (); 12216 const char *kind = is_debug_types ? "TU" : "CU"; 12217 struct dwo_file *dwo_file; 12218 struct dwo_unit *dwo_unit; 12219 struct virtual_v2_or_v5_dwo_sections sections; 12220 void **dwo_file_slot; 12221 int i; 12222 12223 gdb_assert (dwp_file->version == 2); 12224 12225 if (dwarf_read_debug) 12226 { 12227 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n", 12228 kind, 12229 pulongest (unit_index), hex_string (signature), 12230 dwp_file->name); 12231 } 12232 12233 /* Fetch the section offsets of this DWO unit. */ 12234 12235 memset (§ions, 0, sizeof (sections)); 12236 12237 for (i = 0; i < dwp_htab->nr_columns; ++i) 12238 { 12239 uint32_t offset = read_4_bytes (dbfd, 12240 dwp_htab->section_pool.v2.offsets 12241 + (((unit_index - 1) * dwp_htab->nr_columns 12242 + i) 12243 * sizeof (uint32_t))); 12244 uint32_t size = read_4_bytes (dbfd, 12245 dwp_htab->section_pool.v2.sizes 12246 + (((unit_index - 1) * dwp_htab->nr_columns 12247 + i) 12248 * sizeof (uint32_t))); 12249 12250 switch (dwp_htab->section_pool.v2.section_ids[i]) 12251 { 12252 case DW_SECT_INFO: 12253 case DW_SECT_TYPES: 12254 sections.info_or_types_offset = offset; 12255 sections.info_or_types_size = size; 12256 break; 12257 case DW_SECT_ABBREV: 12258 sections.abbrev_offset = offset; 12259 sections.abbrev_size = size; 12260 break; 12261 case DW_SECT_LINE: 12262 sections.line_offset = offset; 12263 sections.line_size = size; 12264 break; 12265 case DW_SECT_LOC: 12266 sections.loc_offset = offset; 12267 sections.loc_size = size; 12268 break; 12269 case DW_SECT_STR_OFFSETS: 12270 sections.str_offsets_offset = offset; 12271 sections.str_offsets_size = size; 12272 break; 12273 case DW_SECT_MACINFO: 12274 sections.macinfo_offset = offset; 12275 sections.macinfo_size = size; 12276 break; 12277 case DW_SECT_MACRO: 12278 sections.macro_offset = offset; 12279 sections.macro_size = size; 12280 break; 12281 } 12282 } 12283 12284 /* It's easier for the rest of the code if we fake a struct dwo_file and 12285 have dwo_unit "live" in that. At least for now. 12286 12287 The DWP file can be made up of a random collection of CUs and TUs. 12288 However, for each CU + set of TUs that came from the same original DWO 12289 file, we can combine them back into a virtual DWO file to save space 12290 (fewer struct dwo_file objects to allocate). Remember that for really 12291 large apps there can be on the order of 8K CUs and 200K TUs, or more. */ 12292 12293 std::string virtual_dwo_name = 12294 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld", 12295 (long) (sections.abbrev_size ? sections.abbrev_offset : 0), 12296 (long) (sections.line_size ? sections.line_offset : 0), 12297 (long) (sections.loc_size ? sections.loc_offset : 0), 12298 (long) (sections.str_offsets_size 12299 ? sections.str_offsets_offset : 0)); 12300 /* Can we use an existing virtual DWO file? */ 12301 dwo_file_slot = lookup_dwo_file_slot (per_objfile, virtual_dwo_name.c_str (), 12302 comp_dir); 12303 /* Create one if necessary. */ 12304 if (*dwo_file_slot == NULL) 12305 { 12306 if (dwarf_read_debug) 12307 { 12308 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n", 12309 virtual_dwo_name.c_str ()); 12310 } 12311 dwo_file = new struct dwo_file; 12312 dwo_file->dwo_name = per_objfile->objfile->intern (virtual_dwo_name); 12313 dwo_file->comp_dir = comp_dir; 12314 dwo_file->sections.abbrev = 12315 create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.abbrev, 12316 sections.abbrev_offset, 12317 sections.abbrev_size); 12318 dwo_file->sections.line = 12319 create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.line, 12320 sections.line_offset, 12321 sections.line_size); 12322 dwo_file->sections.loc = 12323 create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.loc, 12324 sections.loc_offset, sections.loc_size); 12325 dwo_file->sections.macinfo = 12326 create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.macinfo, 12327 sections.macinfo_offset, 12328 sections.macinfo_size); 12329 dwo_file->sections.macro = 12330 create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.macro, 12331 sections.macro_offset, 12332 sections.macro_size); 12333 dwo_file->sections.str_offsets = 12334 create_dwp_v2_or_v5_section (per_objfile, 12335 &dwp_file->sections.str_offsets, 12336 sections.str_offsets_offset, 12337 sections.str_offsets_size); 12338 /* The "str" section is global to the entire DWP file. */ 12339 dwo_file->sections.str = dwp_file->sections.str; 12340 /* The info or types section is assigned below to dwo_unit, 12341 there's no need to record it in dwo_file. 12342 Also, we can't simply record type sections in dwo_file because 12343 we record a pointer into the vector in dwo_unit. As we collect more 12344 types we'll grow the vector and eventually have to reallocate space 12345 for it, invalidating all copies of pointers into the previous 12346 contents. */ 12347 *dwo_file_slot = dwo_file; 12348 } 12349 else 12350 { 12351 if (dwarf_read_debug) 12352 { 12353 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n", 12354 virtual_dwo_name.c_str ()); 12355 } 12356 dwo_file = (struct dwo_file *) *dwo_file_slot; 12357 } 12358 12359 dwo_unit = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, struct dwo_unit); 12360 dwo_unit->dwo_file = dwo_file; 12361 dwo_unit->signature = signature; 12362 dwo_unit->section = 12363 XOBNEW (&per_objfile->per_bfd->obstack, struct dwarf2_section_info); 12364 *dwo_unit->section = create_dwp_v2_or_v5_section 12365 (per_objfile, 12366 is_debug_types 12367 ? &dwp_file->sections.types 12368 : &dwp_file->sections.info, 12369 sections.info_or_types_offset, 12370 sections.info_or_types_size); 12371 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */ 12372 12373 return dwo_unit; 12374 } 12375 12376 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE. 12377 UNIT_INDEX is the index of the DWO unit in the DWP hash table. 12378 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. 12379 This is for DWP version 5 files. */ 12380 12381 static struct dwo_unit * 12382 create_dwo_unit_in_dwp_v5 (dwarf2_per_objfile *per_objfile, 12383 struct dwp_file *dwp_file, 12384 uint32_t unit_index, 12385 const char *comp_dir, 12386 ULONGEST signature, int is_debug_types) 12387 { 12388 const struct dwp_hash_table *dwp_htab 12389 = is_debug_types ? dwp_file->tus : dwp_file->cus; 12390 bfd *dbfd = dwp_file->dbfd.get (); 12391 const char *kind = is_debug_types ? "TU" : "CU"; 12392 struct dwo_file *dwo_file; 12393 struct dwo_unit *dwo_unit; 12394 struct virtual_v2_or_v5_dwo_sections sections {}; 12395 void **dwo_file_slot; 12396 12397 gdb_assert (dwp_file->version == 5); 12398 12399 if (dwarf_read_debug) 12400 { 12401 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V5 file: %s\n", 12402 kind, 12403 pulongest (unit_index), hex_string (signature), 12404 dwp_file->name); 12405 } 12406 12407 /* Fetch the section offsets of this DWO unit. */ 12408 12409 /* memset (§ions, 0, sizeof (sections)); */ 12410 12411 for (int i = 0; i < dwp_htab->nr_columns; ++i) 12412 { 12413 uint32_t offset = read_4_bytes (dbfd, 12414 dwp_htab->section_pool.v5.offsets 12415 + (((unit_index - 1) 12416 * dwp_htab->nr_columns 12417 + i) 12418 * sizeof (uint32_t))); 12419 uint32_t size = read_4_bytes (dbfd, 12420 dwp_htab->section_pool.v5.sizes 12421 + (((unit_index - 1) * dwp_htab->nr_columns 12422 + i) 12423 * sizeof (uint32_t))); 12424 12425 switch (dwp_htab->section_pool.v5.section_ids[i]) 12426 { 12427 case DW_SECT_ABBREV_V5: 12428 sections.abbrev_offset = offset; 12429 sections.abbrev_size = size; 12430 break; 12431 case DW_SECT_INFO_V5: 12432 sections.info_or_types_offset = offset; 12433 sections.info_or_types_size = size; 12434 break; 12435 case DW_SECT_LINE_V5: 12436 sections.line_offset = offset; 12437 sections.line_size = size; 12438 break; 12439 case DW_SECT_LOCLISTS_V5: 12440 sections.loclists_offset = offset; 12441 sections.loclists_size = size; 12442 break; 12443 case DW_SECT_MACRO_V5: 12444 sections.macro_offset = offset; 12445 sections.macro_size = size; 12446 break; 12447 case DW_SECT_RNGLISTS_V5: 12448 sections.rnglists_offset = offset; 12449 sections.rnglists_size = size; 12450 break; 12451 case DW_SECT_STR_OFFSETS_V5: 12452 sections.str_offsets_offset = offset; 12453 sections.str_offsets_size = size; 12454 break; 12455 case DW_SECT_RESERVED_V5: 12456 default: 12457 break; 12458 } 12459 } 12460 12461 /* It's easier for the rest of the code if we fake a struct dwo_file and 12462 have dwo_unit "live" in that. At least for now. 12463 12464 The DWP file can be made up of a random collection of CUs and TUs. 12465 However, for each CU + set of TUs that came from the same original DWO 12466 file, we can combine them back into a virtual DWO file to save space 12467 (fewer struct dwo_file objects to allocate). Remember that for really 12468 large apps there can be on the order of 8K CUs and 200K TUs, or more. */ 12469 12470 std::string virtual_dwo_name = 12471 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld-%ld-%ld", 12472 (long) (sections.abbrev_size ? sections.abbrev_offset : 0), 12473 (long) (sections.line_size ? sections.line_offset : 0), 12474 (long) (sections.loclists_size ? sections.loclists_offset : 0), 12475 (long) (sections.str_offsets_size 12476 ? sections.str_offsets_offset : 0), 12477 (long) (sections.macro_size ? sections.macro_offset : 0), 12478 (long) (sections.rnglists_size ? sections.rnglists_offset: 0)); 12479 /* Can we use an existing virtual DWO file? */ 12480 dwo_file_slot = lookup_dwo_file_slot (per_objfile, 12481 virtual_dwo_name.c_str (), 12482 comp_dir); 12483 /* Create one if necessary. */ 12484 if (*dwo_file_slot == NULL) 12485 { 12486 if (dwarf_read_debug) 12487 { 12488 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n", 12489 virtual_dwo_name.c_str ()); 12490 } 12491 dwo_file = new struct dwo_file; 12492 dwo_file->dwo_name = per_objfile->objfile->intern (virtual_dwo_name); 12493 dwo_file->comp_dir = comp_dir; 12494 dwo_file->sections.abbrev = 12495 create_dwp_v2_or_v5_section (per_objfile, 12496 &dwp_file->sections.abbrev, 12497 sections.abbrev_offset, 12498 sections.abbrev_size); 12499 dwo_file->sections.line = 12500 create_dwp_v2_or_v5_section (per_objfile, 12501 &dwp_file->sections.line, 12502 sections.line_offset, sections.line_size); 12503 dwo_file->sections.macro = 12504 create_dwp_v2_or_v5_section (per_objfile, 12505 &dwp_file->sections.macro, 12506 sections.macro_offset, 12507 sections.macro_size); 12508 dwo_file->sections.loclists = 12509 create_dwp_v2_or_v5_section (per_objfile, 12510 &dwp_file->sections.loclists, 12511 sections.loclists_offset, 12512 sections.loclists_size); 12513 dwo_file->sections.rnglists = 12514 create_dwp_v2_or_v5_section (per_objfile, 12515 &dwp_file->sections.rnglists, 12516 sections.rnglists_offset, 12517 sections.rnglists_size); 12518 dwo_file->sections.str_offsets = 12519 create_dwp_v2_or_v5_section (per_objfile, 12520 &dwp_file->sections.str_offsets, 12521 sections.str_offsets_offset, 12522 sections.str_offsets_size); 12523 /* The "str" section is global to the entire DWP file. */ 12524 dwo_file->sections.str = dwp_file->sections.str; 12525 /* The info or types section is assigned below to dwo_unit, 12526 there's no need to record it in dwo_file. 12527 Also, we can't simply record type sections in dwo_file because 12528 we record a pointer into the vector in dwo_unit. As we collect more 12529 types we'll grow the vector and eventually have to reallocate space 12530 for it, invalidating all copies of pointers into the previous 12531 contents. */ 12532 *dwo_file_slot = dwo_file; 12533 } 12534 else 12535 { 12536 if (dwarf_read_debug) 12537 { 12538 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n", 12539 virtual_dwo_name.c_str ()); 12540 } 12541 dwo_file = (struct dwo_file *) *dwo_file_slot; 12542 } 12543 12544 dwo_unit = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, struct dwo_unit); 12545 dwo_unit->dwo_file = dwo_file; 12546 dwo_unit->signature = signature; 12547 dwo_unit->section 12548 = XOBNEW (&per_objfile->per_bfd->obstack, struct dwarf2_section_info); 12549 *dwo_unit->section = create_dwp_v2_or_v5_section (per_objfile, 12550 &dwp_file->sections.info, 12551 sections.info_or_types_offset, 12552 sections.info_or_types_size); 12553 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */ 12554 12555 return dwo_unit; 12556 } 12557 12558 /* Lookup the DWO unit with SIGNATURE in DWP_FILE. 12559 Returns NULL if the signature isn't found. */ 12560 12561 static struct dwo_unit * 12562 lookup_dwo_unit_in_dwp (dwarf2_per_objfile *per_objfile, 12563 struct dwp_file *dwp_file, const char *comp_dir, 12564 ULONGEST signature, int is_debug_types) 12565 { 12566 const struct dwp_hash_table *dwp_htab = 12567 is_debug_types ? dwp_file->tus : dwp_file->cus; 12568 bfd *dbfd = dwp_file->dbfd.get (); 12569 uint32_t mask = dwp_htab->nr_slots - 1; 12570 uint32_t hash = signature & mask; 12571 uint32_t hash2 = ((signature >> 32) & mask) | 1; 12572 unsigned int i; 12573 void **slot; 12574 struct dwo_unit find_dwo_cu; 12575 12576 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu)); 12577 find_dwo_cu.signature = signature; 12578 slot = htab_find_slot (is_debug_types 12579 ? dwp_file->loaded_tus.get () 12580 : dwp_file->loaded_cus.get (), 12581 &find_dwo_cu, INSERT); 12582 12583 if (*slot != NULL) 12584 return (struct dwo_unit *) *slot; 12585 12586 /* Use a for loop so that we don't loop forever on bad debug info. */ 12587 for (i = 0; i < dwp_htab->nr_slots; ++i) 12588 { 12589 ULONGEST signature_in_table; 12590 12591 signature_in_table = 12592 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t)); 12593 if (signature_in_table == signature) 12594 { 12595 uint32_t unit_index = 12596 read_4_bytes (dbfd, 12597 dwp_htab->unit_table + hash * sizeof (uint32_t)); 12598 12599 if (dwp_file->version == 1) 12600 { 12601 *slot = create_dwo_unit_in_dwp_v1 (per_objfile, dwp_file, 12602 unit_index, comp_dir, 12603 signature, is_debug_types); 12604 } 12605 else if (dwp_file->version == 2) 12606 { 12607 *slot = create_dwo_unit_in_dwp_v2 (per_objfile, dwp_file, 12608 unit_index, comp_dir, 12609 signature, is_debug_types); 12610 } 12611 else /* version == 5 */ 12612 { 12613 *slot = create_dwo_unit_in_dwp_v5 (per_objfile, dwp_file, 12614 unit_index, comp_dir, 12615 signature, is_debug_types); 12616 } 12617 return (struct dwo_unit *) *slot; 12618 } 12619 if (signature_in_table == 0) 12620 return NULL; 12621 hash = (hash + hash2) & mask; 12622 } 12623 12624 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate" 12625 " [in module %s]"), 12626 dwp_file->name); 12627 } 12628 12629 /* Subroutine of open_dwo_file,open_dwp_file to simplify them. 12630 Open the file specified by FILE_NAME and hand it off to BFD for 12631 preliminary analysis. Return a newly initialized bfd *, which 12632 includes a canonicalized copy of FILE_NAME. 12633 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file. 12634 SEARCH_CWD is true if the current directory is to be searched. 12635 It will be searched before debug-file-directory. 12636 If successful, the file is added to the bfd include table of the 12637 objfile's bfd (see gdb_bfd_record_inclusion). 12638 If unable to find/open the file, return NULL. 12639 NOTE: This function is derived from symfile_bfd_open. */ 12640 12641 static gdb_bfd_ref_ptr 12642 try_open_dwop_file (dwarf2_per_objfile *per_objfile, 12643 const char *file_name, int is_dwp, int search_cwd) 12644 { 12645 int desc; 12646 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if 12647 FILE_NAME contains a '/'. So we can't use it. Instead prepend "." 12648 to debug_file_directory. */ 12649 const char *search_path; 12650 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' }; 12651 12652 gdb::unique_xmalloc_ptr<char> search_path_holder; 12653 if (search_cwd) 12654 { 12655 if (*debug_file_directory != '\0') 12656 { 12657 search_path_holder.reset (concat (".", dirname_separator_string, 12658 debug_file_directory, 12659 (char *) NULL)); 12660 search_path = search_path_holder.get (); 12661 } 12662 else 12663 search_path = "."; 12664 } 12665 else 12666 search_path = debug_file_directory; 12667 12668 openp_flags flags = OPF_RETURN_REALPATH; 12669 if (is_dwp) 12670 flags |= OPF_SEARCH_IN_PATH; 12671 12672 gdb::unique_xmalloc_ptr<char> absolute_name; 12673 desc = openp (search_path, flags, file_name, 12674 O_RDONLY | O_BINARY, &absolute_name); 12675 if (desc < 0) 12676 return NULL; 12677 12678 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (), 12679 gnutarget, desc)); 12680 if (sym_bfd == NULL) 12681 return NULL; 12682 bfd_set_cacheable (sym_bfd.get (), 1); 12683 12684 if (!bfd_check_format (sym_bfd.get (), bfd_object)) 12685 return NULL; 12686 12687 /* Success. Record the bfd as having been included by the objfile's bfd. 12688 This is important because things like demangled_names_hash lives in the 12689 objfile's per_bfd space and may have references to things like symbol 12690 names that live in the DWO/DWP file's per_bfd space. PR 16426. */ 12691 gdb_bfd_record_inclusion (per_objfile->objfile->obfd, sym_bfd.get ()); 12692 12693 return sym_bfd; 12694 } 12695 12696 /* Try to open DWO file FILE_NAME. 12697 COMP_DIR is the DW_AT_comp_dir attribute. 12698 The result is the bfd handle of the file. 12699 If there is a problem finding or opening the file, return NULL. 12700 Upon success, the canonicalized path of the file is stored in the bfd, 12701 same as symfile_bfd_open. */ 12702 12703 static gdb_bfd_ref_ptr 12704 open_dwo_file (dwarf2_per_objfile *per_objfile, 12705 const char *file_name, const char *comp_dir) 12706 { 12707 if (IS_ABSOLUTE_PATH (file_name)) 12708 return try_open_dwop_file (per_objfile, file_name, 12709 0 /*is_dwp*/, 0 /*search_cwd*/); 12710 12711 /* Before trying the search path, try DWO_NAME in COMP_DIR. */ 12712 12713 if (comp_dir != NULL) 12714 { 12715 gdb::unique_xmalloc_ptr<char> path_to_try 12716 (concat (comp_dir, SLASH_STRING, file_name, (char *) NULL)); 12717 12718 /* NOTE: If comp_dir is a relative path, this will also try the 12719 search path, which seems useful. */ 12720 gdb_bfd_ref_ptr abfd (try_open_dwop_file (per_objfile, path_to_try.get (), 12721 0 /*is_dwp*/, 12722 1 /*search_cwd*/)); 12723 if (abfd != NULL) 12724 return abfd; 12725 } 12726 12727 /* That didn't work, try debug-file-directory, which, despite its name, 12728 is a list of paths. */ 12729 12730 if (*debug_file_directory == '\0') 12731 return NULL; 12732 12733 return try_open_dwop_file (per_objfile, file_name, 12734 0 /*is_dwp*/, 1 /*search_cwd*/); 12735 } 12736 12737 /* This function is mapped across the sections and remembers the offset and 12738 size of each of the DWO debugging sections we are interested in. */ 12739 12740 static void 12741 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr) 12742 { 12743 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr; 12744 const struct dwop_section_names *names = &dwop_section_names; 12745 12746 if (section_is_p (sectp->name, &names->abbrev_dwo)) 12747 { 12748 dwo_sections->abbrev.s.section = sectp; 12749 dwo_sections->abbrev.size = bfd_section_size (sectp); 12750 } 12751 else if (section_is_p (sectp->name, &names->info_dwo)) 12752 { 12753 dwo_sections->info.s.section = sectp; 12754 dwo_sections->info.size = bfd_section_size (sectp); 12755 } 12756 else if (section_is_p (sectp->name, &names->line_dwo)) 12757 { 12758 dwo_sections->line.s.section = sectp; 12759 dwo_sections->line.size = bfd_section_size (sectp); 12760 } 12761 else if (section_is_p (sectp->name, &names->loc_dwo)) 12762 { 12763 dwo_sections->loc.s.section = sectp; 12764 dwo_sections->loc.size = bfd_section_size (sectp); 12765 } 12766 else if (section_is_p (sectp->name, &names->loclists_dwo)) 12767 { 12768 dwo_sections->loclists.s.section = sectp; 12769 dwo_sections->loclists.size = bfd_section_size (sectp); 12770 } 12771 else if (section_is_p (sectp->name, &names->macinfo_dwo)) 12772 { 12773 dwo_sections->macinfo.s.section = sectp; 12774 dwo_sections->macinfo.size = bfd_section_size (sectp); 12775 } 12776 else if (section_is_p (sectp->name, &names->macro_dwo)) 12777 { 12778 dwo_sections->macro.s.section = sectp; 12779 dwo_sections->macro.size = bfd_section_size (sectp); 12780 } 12781 else if (section_is_p (sectp->name, &names->rnglists_dwo)) 12782 { 12783 dwo_sections->rnglists.s.section = sectp; 12784 dwo_sections->rnglists.size = bfd_section_size (sectp); 12785 } 12786 else if (section_is_p (sectp->name, &names->str_dwo)) 12787 { 12788 dwo_sections->str.s.section = sectp; 12789 dwo_sections->str.size = bfd_section_size (sectp); 12790 } 12791 else if (section_is_p (sectp->name, &names->str_offsets_dwo)) 12792 { 12793 dwo_sections->str_offsets.s.section = sectp; 12794 dwo_sections->str_offsets.size = bfd_section_size (sectp); 12795 } 12796 else if (section_is_p (sectp->name, &names->types_dwo)) 12797 { 12798 struct dwarf2_section_info type_section; 12799 12800 memset (&type_section, 0, sizeof (type_section)); 12801 type_section.s.section = sectp; 12802 type_section.size = bfd_section_size (sectp); 12803 dwo_sections->types.push_back (type_section); 12804 } 12805 } 12806 12807 /* Initialize the use of the DWO file specified by DWO_NAME and referenced 12808 by PER_CU. This is for the non-DWP case. 12809 The result is NULL if DWO_NAME can't be found. */ 12810 12811 static struct dwo_file * 12812 open_and_init_dwo_file (dwarf2_cu *cu, const char *dwo_name, 12813 const char *comp_dir) 12814 { 12815 dwarf2_per_objfile *per_objfile = cu->per_objfile; 12816 12817 gdb_bfd_ref_ptr dbfd = open_dwo_file (per_objfile, dwo_name, comp_dir); 12818 if (dbfd == NULL) 12819 { 12820 if (dwarf_read_debug) 12821 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name); 12822 return NULL; 12823 } 12824 12825 dwo_file_up dwo_file (new struct dwo_file); 12826 dwo_file->dwo_name = dwo_name; 12827 dwo_file->comp_dir = comp_dir; 12828 dwo_file->dbfd = std::move (dbfd); 12829 12830 bfd_map_over_sections (dwo_file->dbfd.get (), dwarf2_locate_dwo_sections, 12831 &dwo_file->sections); 12832 12833 create_cus_hash_table (per_objfile, cu, *dwo_file, dwo_file->sections.info, 12834 dwo_file->cus); 12835 12836 if (cu->per_cu->dwarf_version < 5) 12837 { 12838 create_debug_types_hash_table (per_objfile, dwo_file.get (), 12839 dwo_file->sections.types, dwo_file->tus); 12840 } 12841 else 12842 { 12843 create_debug_type_hash_table (per_objfile, dwo_file.get (), 12844 &dwo_file->sections.info, dwo_file->tus, 12845 rcuh_kind::TYPE); 12846 } 12847 12848 if (dwarf_read_debug) 12849 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name); 12850 12851 return dwo_file.release (); 12852 } 12853 12854 /* This function is mapped across the sections and remembers the offset and 12855 size of each of the DWP debugging sections common to version 1 and 2 that 12856 we are interested in. */ 12857 12858 static void 12859 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp, 12860 void *dwp_file_ptr) 12861 { 12862 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr; 12863 const struct dwop_section_names *names = &dwop_section_names; 12864 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx; 12865 12866 /* Record the ELF section number for later lookup: this is what the 12867 .debug_cu_index,.debug_tu_index tables use in DWP V1. */ 12868 gdb_assert (elf_section_nr < dwp_file->num_sections); 12869 dwp_file->elf_sections[elf_section_nr] = sectp; 12870 12871 /* Look for specific sections that we need. */ 12872 if (section_is_p (sectp->name, &names->str_dwo)) 12873 { 12874 dwp_file->sections.str.s.section = sectp; 12875 dwp_file->sections.str.size = bfd_section_size (sectp); 12876 } 12877 else if (section_is_p (sectp->name, &names->cu_index)) 12878 { 12879 dwp_file->sections.cu_index.s.section = sectp; 12880 dwp_file->sections.cu_index.size = bfd_section_size (sectp); 12881 } 12882 else if (section_is_p (sectp->name, &names->tu_index)) 12883 { 12884 dwp_file->sections.tu_index.s.section = sectp; 12885 dwp_file->sections.tu_index.size = bfd_section_size (sectp); 12886 } 12887 } 12888 12889 /* This function is mapped across the sections and remembers the offset and 12890 size of each of the DWP version 2 debugging sections that we are interested 12891 in. This is split into a separate function because we don't know if we 12892 have version 1 or 2 or 5 until we parse the cu_index/tu_index sections. */ 12893 12894 static void 12895 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr) 12896 { 12897 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr; 12898 const struct dwop_section_names *names = &dwop_section_names; 12899 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx; 12900 12901 /* Record the ELF section number for later lookup: this is what the 12902 .debug_cu_index,.debug_tu_index tables use in DWP V1. */ 12903 gdb_assert (elf_section_nr < dwp_file->num_sections); 12904 dwp_file->elf_sections[elf_section_nr] = sectp; 12905 12906 /* Look for specific sections that we need. */ 12907 if (section_is_p (sectp->name, &names->abbrev_dwo)) 12908 { 12909 dwp_file->sections.abbrev.s.section = sectp; 12910 dwp_file->sections.abbrev.size = bfd_section_size (sectp); 12911 } 12912 else if (section_is_p (sectp->name, &names->info_dwo)) 12913 { 12914 dwp_file->sections.info.s.section = sectp; 12915 dwp_file->sections.info.size = bfd_section_size (sectp); 12916 } 12917 else if (section_is_p (sectp->name, &names->line_dwo)) 12918 { 12919 dwp_file->sections.line.s.section = sectp; 12920 dwp_file->sections.line.size = bfd_section_size (sectp); 12921 } 12922 else if (section_is_p (sectp->name, &names->loc_dwo)) 12923 { 12924 dwp_file->sections.loc.s.section = sectp; 12925 dwp_file->sections.loc.size = bfd_section_size (sectp); 12926 } 12927 else if (section_is_p (sectp->name, &names->macinfo_dwo)) 12928 { 12929 dwp_file->sections.macinfo.s.section = sectp; 12930 dwp_file->sections.macinfo.size = bfd_section_size (sectp); 12931 } 12932 else if (section_is_p (sectp->name, &names->macro_dwo)) 12933 { 12934 dwp_file->sections.macro.s.section = sectp; 12935 dwp_file->sections.macro.size = bfd_section_size (sectp); 12936 } 12937 else if (section_is_p (sectp->name, &names->str_offsets_dwo)) 12938 { 12939 dwp_file->sections.str_offsets.s.section = sectp; 12940 dwp_file->sections.str_offsets.size = bfd_section_size (sectp); 12941 } 12942 else if (section_is_p (sectp->name, &names->types_dwo)) 12943 { 12944 dwp_file->sections.types.s.section = sectp; 12945 dwp_file->sections.types.size = bfd_section_size (sectp); 12946 } 12947 } 12948 12949 /* This function is mapped across the sections and remembers the offset and 12950 size of each of the DWP version 5 debugging sections that we are interested 12951 in. This is split into a separate function because we don't know if we 12952 have version 1 or 2 or 5 until we parse the cu_index/tu_index sections. */ 12953 12954 static void 12955 dwarf2_locate_v5_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr) 12956 { 12957 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr; 12958 const struct dwop_section_names *names = &dwop_section_names; 12959 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx; 12960 12961 /* Record the ELF section number for later lookup: this is what the 12962 .debug_cu_index,.debug_tu_index tables use in DWP V1. */ 12963 gdb_assert (elf_section_nr < dwp_file->num_sections); 12964 dwp_file->elf_sections[elf_section_nr] = sectp; 12965 12966 /* Look for specific sections that we need. */ 12967 if (section_is_p (sectp->name, &names->abbrev_dwo)) 12968 { 12969 dwp_file->sections.abbrev.s.section = sectp; 12970 dwp_file->sections.abbrev.size = bfd_section_size (sectp); 12971 } 12972 else if (section_is_p (sectp->name, &names->info_dwo)) 12973 { 12974 dwp_file->sections.info.s.section = sectp; 12975 dwp_file->sections.info.size = bfd_section_size (sectp); 12976 } 12977 else if (section_is_p (sectp->name, &names->line_dwo)) 12978 { 12979 dwp_file->sections.line.s.section = sectp; 12980 dwp_file->sections.line.size = bfd_section_size (sectp); 12981 } 12982 else if (section_is_p (sectp->name, &names->loclists_dwo)) 12983 { 12984 dwp_file->sections.loclists.s.section = sectp; 12985 dwp_file->sections.loclists.size = bfd_section_size (sectp); 12986 } 12987 else if (section_is_p (sectp->name, &names->macro_dwo)) 12988 { 12989 dwp_file->sections.macro.s.section = sectp; 12990 dwp_file->sections.macro.size = bfd_section_size (sectp); 12991 } 12992 else if (section_is_p (sectp->name, &names->rnglists_dwo)) 12993 { 12994 dwp_file->sections.rnglists.s.section = sectp; 12995 dwp_file->sections.rnglists.size = bfd_section_size (sectp); 12996 } 12997 else if (section_is_p (sectp->name, &names->str_offsets_dwo)) 12998 { 12999 dwp_file->sections.str_offsets.s.section = sectp; 13000 dwp_file->sections.str_offsets.size = bfd_section_size (sectp); 13001 } 13002 } 13003 13004 /* Hash function for dwp_file loaded CUs/TUs. */ 13005 13006 static hashval_t 13007 hash_dwp_loaded_cutus (const void *item) 13008 { 13009 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item; 13010 13011 /* This drops the top 32 bits of the signature, but is ok for a hash. */ 13012 return dwo_unit->signature; 13013 } 13014 13015 /* Equality function for dwp_file loaded CUs/TUs. */ 13016 13017 static int 13018 eq_dwp_loaded_cutus (const void *a, const void *b) 13019 { 13020 const struct dwo_unit *dua = (const struct dwo_unit *) a; 13021 const struct dwo_unit *dub = (const struct dwo_unit *) b; 13022 13023 return dua->signature == dub->signature; 13024 } 13025 13026 /* Allocate a hash table for dwp_file loaded CUs/TUs. */ 13027 13028 static htab_up 13029 allocate_dwp_loaded_cutus_table () 13030 { 13031 return htab_up (htab_create_alloc (3, 13032 hash_dwp_loaded_cutus, 13033 eq_dwp_loaded_cutus, 13034 NULL, xcalloc, xfree)); 13035 } 13036 13037 /* Try to open DWP file FILE_NAME. 13038 The result is the bfd handle of the file. 13039 If there is a problem finding or opening the file, return NULL. 13040 Upon success, the canonicalized path of the file is stored in the bfd, 13041 same as symfile_bfd_open. */ 13042 13043 static gdb_bfd_ref_ptr 13044 open_dwp_file (dwarf2_per_objfile *per_objfile, const char *file_name) 13045 { 13046 gdb_bfd_ref_ptr abfd (try_open_dwop_file (per_objfile, file_name, 13047 1 /*is_dwp*/, 13048 1 /*search_cwd*/)); 13049 if (abfd != NULL) 13050 return abfd; 13051 13052 /* Work around upstream bug 15652. 13053 http://sourceware.org/bugzilla/show_bug.cgi?id=15652 13054 [Whether that's a "bug" is debatable, but it is getting in our way.] 13055 We have no real idea where the dwp file is, because gdb's realpath-ing 13056 of the executable's path may have discarded the needed info. 13057 [IWBN if the dwp file name was recorded in the executable, akin to 13058 .gnu_debuglink, but that doesn't exist yet.] 13059 Strip the directory from FILE_NAME and search again. */ 13060 if (*debug_file_directory != '\0') 13061 { 13062 /* Don't implicitly search the current directory here. 13063 If the user wants to search "." to handle this case, 13064 it must be added to debug-file-directory. */ 13065 return try_open_dwop_file (per_objfile, lbasename (file_name), 13066 1 /*is_dwp*/, 13067 0 /*search_cwd*/); 13068 } 13069 13070 return NULL; 13071 } 13072 13073 /* Initialize the use of the DWP file for the current objfile. 13074 By convention the name of the DWP file is ${objfile}.dwp. 13075 The result is NULL if it can't be found. */ 13076 13077 static std::unique_ptr<struct dwp_file> 13078 open_and_init_dwp_file (dwarf2_per_objfile *per_objfile) 13079 { 13080 struct objfile *objfile = per_objfile->objfile; 13081 13082 /* Try to find first .dwp for the binary file before any symbolic links 13083 resolving. */ 13084 13085 /* If the objfile is a debug file, find the name of the real binary 13086 file and get the name of dwp file from there. */ 13087 std::string dwp_name; 13088 if (objfile->separate_debug_objfile_backlink != NULL) 13089 { 13090 struct objfile *backlink = objfile->separate_debug_objfile_backlink; 13091 const char *backlink_basename = lbasename (backlink->original_name); 13092 13093 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename; 13094 } 13095 else 13096 dwp_name = objfile->original_name; 13097 13098 dwp_name += ".dwp"; 13099 13100 gdb_bfd_ref_ptr dbfd (open_dwp_file (per_objfile, dwp_name.c_str ())); 13101 if (dbfd == NULL 13102 && strcmp (objfile->original_name, objfile_name (objfile)) != 0) 13103 { 13104 /* Try to find .dwp for the binary file after gdb_realpath resolving. */ 13105 dwp_name = objfile_name (objfile); 13106 dwp_name += ".dwp"; 13107 dbfd = open_dwp_file (per_objfile, dwp_name.c_str ()); 13108 } 13109 13110 if (dbfd == NULL) 13111 { 13112 if (dwarf_read_debug) 13113 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ()); 13114 return std::unique_ptr<dwp_file> (); 13115 } 13116 13117 const char *name = bfd_get_filename (dbfd.get ()); 13118 std::unique_ptr<struct dwp_file> dwp_file 13119 (new struct dwp_file (name, std::move (dbfd))); 13120 13121 dwp_file->num_sections = elf_numsections (dwp_file->dbfd); 13122 dwp_file->elf_sections = 13123 OBSTACK_CALLOC (&per_objfile->per_bfd->obstack, 13124 dwp_file->num_sections, asection *); 13125 13126 bfd_map_over_sections (dwp_file->dbfd.get (), 13127 dwarf2_locate_common_dwp_sections, 13128 dwp_file.get ()); 13129 13130 dwp_file->cus = create_dwp_hash_table (per_objfile, dwp_file.get (), 0); 13131 13132 dwp_file->tus = create_dwp_hash_table (per_objfile, dwp_file.get (), 1); 13133 13134 /* The DWP file version is stored in the hash table. Oh well. */ 13135 if (dwp_file->cus && dwp_file->tus 13136 && dwp_file->cus->version != dwp_file->tus->version) 13137 { 13138 /* Technically speaking, we should try to limp along, but this is 13139 pretty bizarre. We use pulongest here because that's the established 13140 portability solution (e.g, we cannot use %u for uint32_t). */ 13141 error (_("Dwarf Error: DWP file CU version %s doesn't match" 13142 " TU version %s [in DWP file %s]"), 13143 pulongest (dwp_file->cus->version), 13144 pulongest (dwp_file->tus->version), dwp_name.c_str ()); 13145 } 13146 13147 if (dwp_file->cus) 13148 dwp_file->version = dwp_file->cus->version; 13149 else if (dwp_file->tus) 13150 dwp_file->version = dwp_file->tus->version; 13151 else 13152 dwp_file->version = 2; 13153 13154 if (dwp_file->version == 2) 13155 bfd_map_over_sections (dwp_file->dbfd.get (), 13156 dwarf2_locate_v2_dwp_sections, 13157 dwp_file.get ()); 13158 else if (dwp_file->version == 5) 13159 bfd_map_over_sections (dwp_file->dbfd.get (), 13160 dwarf2_locate_v5_dwp_sections, 13161 dwp_file.get ()); 13162 13163 13164 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (); 13165 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (); 13166 13167 if (dwarf_read_debug) 13168 { 13169 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name); 13170 fprintf_unfiltered (gdb_stdlog, 13171 " %s CUs, %s TUs\n", 13172 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0), 13173 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0)); 13174 } 13175 13176 return dwp_file; 13177 } 13178 13179 /* Wrapper around open_and_init_dwp_file, only open it once. */ 13180 13181 static struct dwp_file * 13182 get_dwp_file (dwarf2_per_objfile *per_objfile) 13183 { 13184 if (!per_objfile->per_bfd->dwp_checked) 13185 { 13186 per_objfile->per_bfd->dwp_file = open_and_init_dwp_file (per_objfile); 13187 per_objfile->per_bfd->dwp_checked = 1; 13188 } 13189 return per_objfile->per_bfd->dwp_file.get (); 13190 } 13191 13192 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit. 13193 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME 13194 or in the DWP file for the objfile, referenced by THIS_UNIT. 13195 If non-NULL, comp_dir is the DW_AT_comp_dir attribute. 13196 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU. 13197 13198 This is called, for example, when wanting to read a variable with a 13199 complex location. Therefore we don't want to do file i/o for every call. 13200 Therefore we don't want to look for a DWO file on every call. 13201 Therefore we first see if we've already seen SIGNATURE in a DWP file, 13202 then we check if we've already seen DWO_NAME, and only THEN do we check 13203 for a DWO file. 13204 13205 The result is a pointer to the dwo_unit object or NULL if we didn't find it 13206 (dwo_id mismatch or couldn't find the DWO/DWP file). */ 13207 13208 static struct dwo_unit * 13209 lookup_dwo_cutu (dwarf2_cu *cu, const char *dwo_name, const char *comp_dir, 13210 ULONGEST signature, int is_debug_types) 13211 { 13212 dwarf2_per_objfile *per_objfile = cu->per_objfile; 13213 struct objfile *objfile = per_objfile->objfile; 13214 const char *kind = is_debug_types ? "TU" : "CU"; 13215 void **dwo_file_slot; 13216 struct dwo_file *dwo_file; 13217 struct dwp_file *dwp_file; 13218 13219 /* First see if there's a DWP file. 13220 If we have a DWP file but didn't find the DWO inside it, don't 13221 look for the original DWO file. It makes gdb behave differently 13222 depending on whether one is debugging in the build tree. */ 13223 13224 dwp_file = get_dwp_file (per_objfile); 13225 if (dwp_file != NULL) 13226 { 13227 const struct dwp_hash_table *dwp_htab = 13228 is_debug_types ? dwp_file->tus : dwp_file->cus; 13229 13230 if (dwp_htab != NULL) 13231 { 13232 struct dwo_unit *dwo_cutu = 13233 lookup_dwo_unit_in_dwp (per_objfile, dwp_file, comp_dir, signature, 13234 is_debug_types); 13235 13236 if (dwo_cutu != NULL) 13237 { 13238 if (dwarf_read_debug) 13239 { 13240 fprintf_unfiltered (gdb_stdlog, 13241 "Virtual DWO %s %s found: @%s\n", 13242 kind, hex_string (signature), 13243 host_address_to_string (dwo_cutu)); 13244 } 13245 return dwo_cutu; 13246 } 13247 } 13248 } 13249 else 13250 { 13251 /* No DWP file, look for the DWO file. */ 13252 13253 dwo_file_slot = lookup_dwo_file_slot (per_objfile, dwo_name, comp_dir); 13254 if (*dwo_file_slot == NULL) 13255 { 13256 /* Read in the file and build a table of the CUs/TUs it contains. */ 13257 *dwo_file_slot = open_and_init_dwo_file (cu, dwo_name, comp_dir); 13258 } 13259 /* NOTE: This will be NULL if unable to open the file. */ 13260 dwo_file = (struct dwo_file *) *dwo_file_slot; 13261 13262 if (dwo_file != NULL) 13263 { 13264 struct dwo_unit *dwo_cutu = NULL; 13265 13266 if (is_debug_types && dwo_file->tus) 13267 { 13268 struct dwo_unit find_dwo_cutu; 13269 13270 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu)); 13271 find_dwo_cutu.signature = signature; 13272 dwo_cutu 13273 = (struct dwo_unit *) htab_find (dwo_file->tus.get (), 13274 &find_dwo_cutu); 13275 } 13276 else if (!is_debug_types && dwo_file->cus) 13277 { 13278 struct dwo_unit find_dwo_cutu; 13279 13280 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu)); 13281 find_dwo_cutu.signature = signature; 13282 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus.get (), 13283 &find_dwo_cutu); 13284 } 13285 13286 if (dwo_cutu != NULL) 13287 { 13288 if (dwarf_read_debug) 13289 { 13290 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n", 13291 kind, dwo_name, hex_string (signature), 13292 host_address_to_string (dwo_cutu)); 13293 } 13294 return dwo_cutu; 13295 } 13296 } 13297 } 13298 13299 /* We didn't find it. This could mean a dwo_id mismatch, or 13300 someone deleted the DWO/DWP file, or the search path isn't set up 13301 correctly to find the file. */ 13302 13303 if (dwarf_read_debug) 13304 { 13305 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n", 13306 kind, dwo_name, hex_string (signature)); 13307 } 13308 13309 /* This is a warning and not a complaint because it can be caused by 13310 pilot error (e.g., user accidentally deleting the DWO). */ 13311 { 13312 /* Print the name of the DWP file if we looked there, helps the user 13313 better diagnose the problem. */ 13314 std::string dwp_text; 13315 13316 if (dwp_file != NULL) 13317 dwp_text = string_printf (" [in DWP file %s]", 13318 lbasename (dwp_file->name)); 13319 13320 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s" 13321 " [in module %s]"), 13322 kind, dwo_name, hex_string (signature), dwp_text.c_str (), kind, 13323 sect_offset_str (cu->per_cu->sect_off), objfile_name (objfile)); 13324 } 13325 return NULL; 13326 } 13327 13328 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU. 13329 See lookup_dwo_cutu_unit for details. */ 13330 13331 static struct dwo_unit * 13332 lookup_dwo_comp_unit (dwarf2_cu *cu, const char *dwo_name, const char *comp_dir, 13333 ULONGEST signature) 13334 { 13335 gdb_assert (!cu->per_cu->is_debug_types); 13336 13337 return lookup_dwo_cutu (cu, dwo_name, comp_dir, signature, 0); 13338 } 13339 13340 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU. 13341 See lookup_dwo_cutu_unit for details. */ 13342 13343 static struct dwo_unit * 13344 lookup_dwo_type_unit (dwarf2_cu *cu, const char *dwo_name, const char *comp_dir) 13345 { 13346 gdb_assert (cu->per_cu->is_debug_types); 13347 13348 signatured_type *sig_type = (signatured_type *) cu->per_cu; 13349 13350 return lookup_dwo_cutu (cu, dwo_name, comp_dir, sig_type->signature, 1); 13351 } 13352 13353 /* Traversal function for queue_and_load_all_dwo_tus. */ 13354 13355 static int 13356 queue_and_load_dwo_tu (void **slot, void *info) 13357 { 13358 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot; 13359 dwarf2_cu *cu = (dwarf2_cu *) info; 13360 ULONGEST signature = dwo_unit->signature; 13361 signatured_type *sig_type = lookup_dwo_signatured_type (cu, signature); 13362 13363 if (sig_type != NULL) 13364 { 13365 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu; 13366 13367 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's 13368 a real dependency of PER_CU on SIG_TYPE. That is detected later 13369 while processing PER_CU. */ 13370 if (maybe_queue_comp_unit (NULL, sig_cu, cu->per_objfile, cu->language)) 13371 load_full_type_unit (sig_cu, cu->per_objfile); 13372 cu->per_cu->imported_symtabs_push (sig_cu); 13373 } 13374 13375 return 1; 13376 } 13377 13378 /* Queue all TUs contained in the DWO of CU to be read in. 13379 The DWO may have the only definition of the type, though it may not be 13380 referenced anywhere in PER_CU. Thus we have to load *all* its TUs. 13381 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */ 13382 13383 static void 13384 queue_and_load_all_dwo_tus (dwarf2_cu *cu) 13385 { 13386 struct dwo_unit *dwo_unit; 13387 struct dwo_file *dwo_file; 13388 13389 gdb_assert (cu != nullptr); 13390 gdb_assert (!cu->per_cu->is_debug_types); 13391 gdb_assert (get_dwp_file (cu->per_objfile) == nullptr); 13392 13393 dwo_unit = cu->dwo_unit; 13394 gdb_assert (dwo_unit != NULL); 13395 13396 dwo_file = dwo_unit->dwo_file; 13397 if (dwo_file->tus != NULL) 13398 htab_traverse_noresize (dwo_file->tus.get (), queue_and_load_dwo_tu, cu); 13399 } 13400 13401 /* Read in various DIEs. */ 13402 13403 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes). 13404 Inherit only the children of the DW_AT_abstract_origin DIE not being 13405 already referenced by DW_AT_abstract_origin from the children of the 13406 current DIE. */ 13407 13408 static void 13409 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu) 13410 { 13411 struct die_info *child_die; 13412 sect_offset *offsetp; 13413 /* Parent of DIE - referenced by DW_AT_abstract_origin. */ 13414 struct die_info *origin_die; 13415 /* Iterator of the ORIGIN_DIE children. */ 13416 struct die_info *origin_child_die; 13417 struct attribute *attr; 13418 struct dwarf2_cu *origin_cu; 13419 struct pending **origin_previous_list_in_scope; 13420 13421 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu); 13422 if (!attr) 13423 return; 13424 13425 /* Note that following die references may follow to a die in a 13426 different cu. */ 13427 13428 origin_cu = cu; 13429 origin_die = follow_die_ref (die, attr, &origin_cu); 13430 13431 /* We're inheriting ORIGIN's children into the scope we'd put DIE's 13432 symbols in. */ 13433 origin_previous_list_in_scope = origin_cu->list_in_scope; 13434 origin_cu->list_in_scope = cu->list_in_scope; 13435 13436 if (die->tag != origin_die->tag 13437 && !(die->tag == DW_TAG_inlined_subroutine 13438 && origin_die->tag == DW_TAG_subprogram)) 13439 complaint (_("DIE %s and its abstract origin %s have different tags"), 13440 sect_offset_str (die->sect_off), 13441 sect_offset_str (origin_die->sect_off)); 13442 13443 std::vector<sect_offset> offsets; 13444 13445 for (child_die = die->child; 13446 child_die && child_die->tag; 13447 child_die = child_die->sibling) 13448 { 13449 struct die_info *child_origin_die; 13450 struct dwarf2_cu *child_origin_cu; 13451 13452 /* We are trying to process concrete instance entries: 13453 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but 13454 it's not relevant to our analysis here. i.e. detecting DIEs that are 13455 present in the abstract instance but not referenced in the concrete 13456 one. */ 13457 if (child_die->tag == DW_TAG_call_site 13458 || child_die->tag == DW_TAG_GNU_call_site) 13459 continue; 13460 13461 /* For each CHILD_DIE, find the corresponding child of 13462 ORIGIN_DIE. If there is more than one layer of 13463 DW_AT_abstract_origin, follow them all; there shouldn't be, 13464 but GCC versions at least through 4.4 generate this (GCC PR 13465 40573). */ 13466 child_origin_die = child_die; 13467 child_origin_cu = cu; 13468 while (1) 13469 { 13470 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin, 13471 child_origin_cu); 13472 if (attr == NULL) 13473 break; 13474 child_origin_die = follow_die_ref (child_origin_die, attr, 13475 &child_origin_cu); 13476 } 13477 13478 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract 13479 counterpart may exist. */ 13480 if (child_origin_die != child_die) 13481 { 13482 if (child_die->tag != child_origin_die->tag 13483 && !(child_die->tag == DW_TAG_inlined_subroutine 13484 && child_origin_die->tag == DW_TAG_subprogram)) 13485 complaint (_("Child DIE %s and its abstract origin %s have " 13486 "different tags"), 13487 sect_offset_str (child_die->sect_off), 13488 sect_offset_str (child_origin_die->sect_off)); 13489 if (child_origin_die->parent != origin_die) 13490 complaint (_("Child DIE %s and its abstract origin %s have " 13491 "different parents"), 13492 sect_offset_str (child_die->sect_off), 13493 sect_offset_str (child_origin_die->sect_off)); 13494 else 13495 offsets.push_back (child_origin_die->sect_off); 13496 } 13497 } 13498 std::sort (offsets.begin (), offsets.end ()); 13499 sect_offset *offsets_end = offsets.data () + offsets.size (); 13500 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++) 13501 if (offsetp[-1] == *offsetp) 13502 complaint (_("Multiple children of DIE %s refer " 13503 "to DIE %s as their abstract origin"), 13504 sect_offset_str (die->sect_off), sect_offset_str (*offsetp)); 13505 13506 offsetp = offsets.data (); 13507 origin_child_die = origin_die->child; 13508 while (origin_child_die && origin_child_die->tag) 13509 { 13510 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */ 13511 while (offsetp < offsets_end 13512 && *offsetp < origin_child_die->sect_off) 13513 offsetp++; 13514 if (offsetp >= offsets_end 13515 || *offsetp > origin_child_die->sect_off) 13516 { 13517 /* Found that ORIGIN_CHILD_DIE is really not referenced. 13518 Check whether we're already processing ORIGIN_CHILD_DIE. 13519 This can happen with mutually referenced abstract_origins. 13520 PR 16581. */ 13521 if (!origin_child_die->in_process) 13522 process_die (origin_child_die, origin_cu); 13523 } 13524 origin_child_die = origin_child_die->sibling; 13525 } 13526 origin_cu->list_in_scope = origin_previous_list_in_scope; 13527 13528 if (cu != origin_cu) 13529 compute_delayed_physnames (origin_cu); 13530 } 13531 13532 static void 13533 read_func_scope (struct die_info *die, struct dwarf2_cu *cu) 13534 { 13535 struct objfile *objfile = cu->per_objfile->objfile; 13536 struct gdbarch *gdbarch = objfile->arch (); 13537 struct context_stack *newobj; 13538 CORE_ADDR lowpc; 13539 CORE_ADDR highpc; 13540 struct die_info *child_die; 13541 struct attribute *attr, *call_line, *call_file; 13542 const char *name; 13543 CORE_ADDR baseaddr; 13544 struct block *block; 13545 int inlined_func = (die->tag == DW_TAG_inlined_subroutine); 13546 std::vector<struct symbol *> template_args; 13547 struct template_symbol *templ_func = NULL; 13548 13549 if (inlined_func) 13550 { 13551 /* If we do not have call site information, we can't show the 13552 caller of this inlined function. That's too confusing, so 13553 only use the scope for local variables. */ 13554 call_line = dwarf2_attr (die, DW_AT_call_line, cu); 13555 call_file = dwarf2_attr (die, DW_AT_call_file, cu); 13556 if (call_line == NULL || call_file == NULL) 13557 { 13558 read_lexical_block_scope (die, cu); 13559 return; 13560 } 13561 } 13562 13563 baseaddr = objfile->text_section_offset (); 13564 13565 name = dwarf2_name (die, cu); 13566 13567 /* Ignore functions with missing or empty names. These are actually 13568 illegal according to the DWARF standard. */ 13569 if (name == NULL) 13570 { 13571 complaint (_("missing name for subprogram DIE at %s"), 13572 sect_offset_str (die->sect_off)); 13573 return; 13574 } 13575 13576 /* Ignore functions with missing or invalid low and high pc attributes. */ 13577 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL) 13578 <= PC_BOUNDS_INVALID) 13579 { 13580 attr = dwarf2_attr (die, DW_AT_external, cu); 13581 if (!attr || !DW_UNSND (attr)) 13582 complaint (_("cannot get low and high bounds " 13583 "for subprogram DIE at %s"), 13584 sect_offset_str (die->sect_off)); 13585 return; 13586 } 13587 13588 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); 13589 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); 13590 13591 /* If we have any template arguments, then we must allocate a 13592 different sort of symbol. */ 13593 for (child_die = die->child; child_die; child_die = child_die->sibling) 13594 { 13595 if (child_die->tag == DW_TAG_template_type_param 13596 || child_die->tag == DW_TAG_template_value_param) 13597 { 13598 templ_func = new (&objfile->objfile_obstack) template_symbol; 13599 templ_func->subclass = SYMBOL_TEMPLATE; 13600 break; 13601 } 13602 } 13603 13604 newobj = cu->get_builder ()->push_context (0, lowpc); 13605 newobj->name = new_symbol (die, read_type_die (die, cu), cu, 13606 (struct symbol *) templ_func); 13607 13608 if (dwarf2_flag_true_p (die, DW_AT_main_subprogram, cu)) 13609 set_objfile_main_name (objfile, newobj->name->linkage_name (), 13610 cu->language); 13611 13612 /* If there is a location expression for DW_AT_frame_base, record 13613 it. */ 13614 attr = dwarf2_attr (die, DW_AT_frame_base, cu); 13615 if (attr != nullptr) 13616 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1); 13617 13618 /* If there is a location for the static link, record it. */ 13619 newobj->static_link = NULL; 13620 attr = dwarf2_attr (die, DW_AT_static_link, cu); 13621 if (attr != nullptr) 13622 { 13623 newobj->static_link 13624 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop); 13625 attr_to_dynamic_prop (attr, die, cu, newobj->static_link, 13626 cu->addr_type ()); 13627 } 13628 13629 cu->list_in_scope = cu->get_builder ()->get_local_symbols (); 13630 13631 if (die->child != NULL) 13632 { 13633 child_die = die->child; 13634 while (child_die && child_die->tag) 13635 { 13636 if (child_die->tag == DW_TAG_template_type_param 13637 || child_die->tag == DW_TAG_template_value_param) 13638 { 13639 struct symbol *arg = new_symbol (child_die, NULL, cu); 13640 13641 if (arg != NULL) 13642 template_args.push_back (arg); 13643 } 13644 else 13645 process_die (child_die, cu); 13646 child_die = child_die->sibling; 13647 } 13648 } 13649 13650 inherit_abstract_dies (die, cu); 13651 13652 /* If we have a DW_AT_specification, we might need to import using 13653 directives from the context of the specification DIE. See the 13654 comment in determine_prefix. */ 13655 if (cu->language == language_cplus 13656 && dwarf2_attr (die, DW_AT_specification, cu)) 13657 { 13658 struct dwarf2_cu *spec_cu = cu; 13659 struct die_info *spec_die = die_specification (die, &spec_cu); 13660 13661 while (spec_die) 13662 { 13663 child_die = spec_die->child; 13664 while (child_die && child_die->tag) 13665 { 13666 if (child_die->tag == DW_TAG_imported_module) 13667 process_die (child_die, spec_cu); 13668 child_die = child_die->sibling; 13669 } 13670 13671 /* In some cases, GCC generates specification DIEs that 13672 themselves contain DW_AT_specification attributes. */ 13673 spec_die = die_specification (spec_die, &spec_cu); 13674 } 13675 } 13676 13677 struct context_stack cstk = cu->get_builder ()->pop_context (); 13678 /* Make a block for the local symbols within. */ 13679 block = cu->get_builder ()->finish_block (cstk.name, cstk.old_blocks, 13680 cstk.static_link, lowpc, highpc); 13681 13682 /* For C++, set the block's scope. */ 13683 if ((cu->language == language_cplus 13684 || cu->language == language_fortran 13685 || cu->language == language_d 13686 || cu->language == language_rust) 13687 && cu->processing_has_namespace_info) 13688 block_set_scope (block, determine_prefix (die, cu), 13689 &objfile->objfile_obstack); 13690 13691 /* If we have address ranges, record them. */ 13692 dwarf2_record_block_ranges (die, block, baseaddr, cu); 13693 13694 gdbarch_make_symbol_special (gdbarch, cstk.name, objfile); 13695 13696 /* Attach template arguments to function. */ 13697 if (!template_args.empty ()) 13698 { 13699 gdb_assert (templ_func != NULL); 13700 13701 templ_func->n_template_arguments = template_args.size (); 13702 templ_func->template_arguments 13703 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *, 13704 templ_func->n_template_arguments); 13705 memcpy (templ_func->template_arguments, 13706 template_args.data (), 13707 (templ_func->n_template_arguments * sizeof (struct symbol *))); 13708 13709 /* Make sure that the symtab is set on the new symbols. Even 13710 though they don't appear in this symtab directly, other parts 13711 of gdb assume that symbols do, and this is reasonably 13712 true. */ 13713 for (symbol *sym : template_args) 13714 symbol_set_symtab (sym, symbol_symtab (templ_func)); 13715 } 13716 13717 /* In C++, we can have functions nested inside functions (e.g., when 13718 a function declares a class that has methods). This means that 13719 when we finish processing a function scope, we may need to go 13720 back to building a containing block's symbol lists. */ 13721 *cu->get_builder ()->get_local_symbols () = cstk.locals; 13722 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives); 13723 13724 /* If we've finished processing a top-level function, subsequent 13725 symbols go in the file symbol list. */ 13726 if (cu->get_builder ()->outermost_context_p ()) 13727 cu->list_in_scope = cu->get_builder ()->get_file_symbols (); 13728 } 13729 13730 /* Process all the DIES contained within a lexical block scope. Start 13731 a new scope, process the dies, and then close the scope. */ 13732 13733 static void 13734 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu) 13735 { 13736 struct objfile *objfile = cu->per_objfile->objfile; 13737 struct gdbarch *gdbarch = objfile->arch (); 13738 CORE_ADDR lowpc, highpc; 13739 struct die_info *child_die; 13740 CORE_ADDR baseaddr; 13741 13742 baseaddr = objfile->text_section_offset (); 13743 13744 /* Ignore blocks with missing or invalid low and high pc attributes. */ 13745 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges 13746 as multiple lexical blocks? Handling children in a sane way would 13747 be nasty. Might be easier to properly extend generic blocks to 13748 describe ranges. */ 13749 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)) 13750 { 13751 case PC_BOUNDS_NOT_PRESENT: 13752 /* DW_TAG_lexical_block has no attributes, process its children as if 13753 there was no wrapping by that DW_TAG_lexical_block. 13754 GCC does no longer produces such DWARF since GCC r224161. */ 13755 for (child_die = die->child; 13756 child_die != NULL && child_die->tag; 13757 child_die = child_die->sibling) 13758 { 13759 /* We might already be processing this DIE. This can happen 13760 in an unusual circumstance -- where a subroutine A 13761 appears lexically in another subroutine B, but A actually 13762 inlines B. The recursion is broken here, rather than in 13763 inherit_abstract_dies, because it seems better to simply 13764 drop concrete children here. */ 13765 if (!child_die->in_process) 13766 process_die (child_die, cu); 13767 } 13768 return; 13769 case PC_BOUNDS_INVALID: 13770 return; 13771 } 13772 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); 13773 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); 13774 13775 cu->get_builder ()->push_context (0, lowpc); 13776 if (die->child != NULL) 13777 { 13778 child_die = die->child; 13779 while (child_die && child_die->tag) 13780 { 13781 process_die (child_die, cu); 13782 child_die = child_die->sibling; 13783 } 13784 } 13785 inherit_abstract_dies (die, cu); 13786 struct context_stack cstk = cu->get_builder ()->pop_context (); 13787 13788 if (*cu->get_builder ()->get_local_symbols () != NULL 13789 || (*cu->get_builder ()->get_local_using_directives ()) != NULL) 13790 { 13791 struct block *block 13792 = cu->get_builder ()->finish_block (0, cstk.old_blocks, NULL, 13793 cstk.start_addr, highpc); 13794 13795 /* Note that recording ranges after traversing children, as we 13796 do here, means that recording a parent's ranges entails 13797 walking across all its children's ranges as they appear in 13798 the address map, which is quadratic behavior. 13799 13800 It would be nicer to record the parent's ranges before 13801 traversing its children, simply overriding whatever you find 13802 there. But since we don't even decide whether to create a 13803 block until after we've traversed its children, that's hard 13804 to do. */ 13805 dwarf2_record_block_ranges (die, block, baseaddr, cu); 13806 } 13807 *cu->get_builder ()->get_local_symbols () = cstk.locals; 13808 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives); 13809 } 13810 13811 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */ 13812 13813 static void 13814 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu) 13815 { 13816 dwarf2_per_objfile *per_objfile = cu->per_objfile; 13817 struct objfile *objfile = per_objfile->objfile; 13818 struct gdbarch *gdbarch = objfile->arch (); 13819 CORE_ADDR pc, baseaddr; 13820 struct attribute *attr; 13821 struct call_site *call_site, call_site_local; 13822 void **slot; 13823 int nparams; 13824 struct die_info *child_die; 13825 13826 baseaddr = objfile->text_section_offset (); 13827 13828 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu); 13829 if (attr == NULL) 13830 { 13831 /* This was a pre-DWARF-5 GNU extension alias 13832 for DW_AT_call_return_pc. */ 13833 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 13834 } 13835 if (!attr) 13836 { 13837 complaint (_("missing DW_AT_call_return_pc for DW_TAG_call_site " 13838 "DIE %s [in module %s]"), 13839 sect_offset_str (die->sect_off), objfile_name (objfile)); 13840 return; 13841 } 13842 pc = attr->value_as_address () + baseaddr; 13843 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc); 13844 13845 if (cu->call_site_htab == NULL) 13846 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq, 13847 NULL, &objfile->objfile_obstack, 13848 hashtab_obstack_allocate, NULL); 13849 call_site_local.pc = pc; 13850 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT); 13851 if (*slot != NULL) 13852 { 13853 complaint (_("Duplicate PC %s for DW_TAG_call_site " 13854 "DIE %s [in module %s]"), 13855 paddress (gdbarch, pc), sect_offset_str (die->sect_off), 13856 objfile_name (objfile)); 13857 return; 13858 } 13859 13860 /* Count parameters at the caller. */ 13861 13862 nparams = 0; 13863 for (child_die = die->child; child_die && child_die->tag; 13864 child_die = child_die->sibling) 13865 { 13866 if (child_die->tag != DW_TAG_call_site_parameter 13867 && child_die->tag != DW_TAG_GNU_call_site_parameter) 13868 { 13869 complaint (_("Tag %d is not DW_TAG_call_site_parameter in " 13870 "DW_TAG_call_site child DIE %s [in module %s]"), 13871 child_die->tag, sect_offset_str (child_die->sect_off), 13872 objfile_name (objfile)); 13873 continue; 13874 } 13875 13876 nparams++; 13877 } 13878 13879 call_site 13880 = ((struct call_site *) 13881 obstack_alloc (&objfile->objfile_obstack, 13882 sizeof (*call_site) 13883 + (sizeof (*call_site->parameter) * (nparams - 1)))); 13884 *slot = call_site; 13885 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter)); 13886 call_site->pc = pc; 13887 13888 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu) 13889 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu)) 13890 { 13891 struct die_info *func_die; 13892 13893 /* Skip also over DW_TAG_inlined_subroutine. */ 13894 for (func_die = die->parent; 13895 func_die && func_die->tag != DW_TAG_subprogram 13896 && func_die->tag != DW_TAG_subroutine_type; 13897 func_die = func_die->parent); 13898 13899 /* DW_AT_call_all_calls is a superset 13900 of DW_AT_call_all_tail_calls. */ 13901 if (func_die 13902 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu) 13903 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu) 13904 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu) 13905 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu)) 13906 { 13907 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is 13908 not complete. But keep CALL_SITE for look ups via call_site_htab, 13909 both the initial caller containing the real return address PC and 13910 the final callee containing the current PC of a chain of tail 13911 calls do not need to have the tail call list complete. But any 13912 function candidate for a virtual tail call frame searched via 13913 TYPE_TAIL_CALL_LIST must have the tail call list complete to be 13914 determined unambiguously. */ 13915 } 13916 else 13917 { 13918 struct type *func_type = NULL; 13919 13920 if (func_die) 13921 func_type = get_die_type (func_die, cu); 13922 if (func_type != NULL) 13923 { 13924 gdb_assert (func_type->code () == TYPE_CODE_FUNC); 13925 13926 /* Enlist this call site to the function. */ 13927 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type); 13928 TYPE_TAIL_CALL_LIST (func_type) = call_site; 13929 } 13930 else 13931 complaint (_("Cannot find function owning DW_TAG_call_site " 13932 "DIE %s [in module %s]"), 13933 sect_offset_str (die->sect_off), objfile_name (objfile)); 13934 } 13935 } 13936 13937 attr = dwarf2_attr (die, DW_AT_call_target, cu); 13938 if (attr == NULL) 13939 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu); 13940 if (attr == NULL) 13941 attr = dwarf2_attr (die, DW_AT_call_origin, cu); 13942 if (attr == NULL) 13943 { 13944 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */ 13945 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu); 13946 } 13947 SET_FIELD_DWARF_BLOCK (call_site->target, NULL); 13948 if (!attr || (attr->form_is_block () && DW_BLOCK (attr)->size == 0)) 13949 /* Keep NULL DWARF_BLOCK. */; 13950 else if (attr->form_is_block ()) 13951 { 13952 struct dwarf2_locexpr_baton *dlbaton; 13953 13954 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton); 13955 dlbaton->data = DW_BLOCK (attr)->data; 13956 dlbaton->size = DW_BLOCK (attr)->size; 13957 dlbaton->per_objfile = per_objfile; 13958 dlbaton->per_cu = cu->per_cu; 13959 13960 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton); 13961 } 13962 else if (attr->form_is_ref ()) 13963 { 13964 struct dwarf2_cu *target_cu = cu; 13965 struct die_info *target_die; 13966 13967 target_die = follow_die_ref (die, attr, &target_cu); 13968 gdb_assert (target_cu->per_objfile->objfile == objfile); 13969 if (die_is_declaration (target_die, target_cu)) 13970 { 13971 const char *target_physname; 13972 13973 /* Prefer the mangled name; otherwise compute the demangled one. */ 13974 target_physname = dw2_linkage_name (target_die, target_cu); 13975 if (target_physname == NULL) 13976 target_physname = dwarf2_physname (NULL, target_die, target_cu); 13977 if (target_physname == NULL) 13978 complaint (_("DW_AT_call_target target DIE has invalid " 13979 "physname, for referencing DIE %s [in module %s]"), 13980 sect_offset_str (die->sect_off), objfile_name (objfile)); 13981 else 13982 SET_FIELD_PHYSNAME (call_site->target, target_physname); 13983 } 13984 else 13985 { 13986 CORE_ADDR lowpc; 13987 13988 /* DW_AT_entry_pc should be preferred. */ 13989 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL) 13990 <= PC_BOUNDS_INVALID) 13991 complaint (_("DW_AT_call_target target DIE has invalid " 13992 "low pc, for referencing DIE %s [in module %s]"), 13993 sect_offset_str (die->sect_off), objfile_name (objfile)); 13994 else 13995 { 13996 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); 13997 SET_FIELD_PHYSADDR (call_site->target, lowpc); 13998 } 13999 } 14000 } 14001 else 14002 complaint (_("DW_TAG_call_site DW_AT_call_target is neither " 14003 "block nor reference, for DIE %s [in module %s]"), 14004 sect_offset_str (die->sect_off), objfile_name (objfile)); 14005 14006 call_site->per_cu = cu->per_cu; 14007 call_site->per_objfile = per_objfile; 14008 14009 for (child_die = die->child; 14010 child_die && child_die->tag; 14011 child_die = child_die->sibling) 14012 { 14013 struct call_site_parameter *parameter; 14014 struct attribute *loc, *origin; 14015 14016 if (child_die->tag != DW_TAG_call_site_parameter 14017 && child_die->tag != DW_TAG_GNU_call_site_parameter) 14018 { 14019 /* Already printed the complaint above. */ 14020 continue; 14021 } 14022 14023 gdb_assert (call_site->parameter_count < nparams); 14024 parameter = &call_site->parameter[call_site->parameter_count]; 14025 14026 /* DW_AT_location specifies the register number or DW_AT_abstract_origin 14027 specifies DW_TAG_formal_parameter. Value of the data assumed for the 14028 register is contained in DW_AT_call_value. */ 14029 14030 loc = dwarf2_attr (child_die, DW_AT_location, cu); 14031 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu); 14032 if (origin == NULL) 14033 { 14034 /* This was a pre-DWARF-5 GNU extension alias 14035 for DW_AT_call_parameter. */ 14036 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu); 14037 } 14038 if (loc == NULL && origin != NULL && origin->form_is_ref ()) 14039 { 14040 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET; 14041 14042 sect_offset sect_off = origin->get_ref_die_offset (); 14043 if (!cu->header.offset_in_cu_p (sect_off)) 14044 { 14045 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this 14046 binding can be done only inside one CU. Such referenced DIE 14047 therefore cannot be even moved to DW_TAG_partial_unit. */ 14048 complaint (_("DW_AT_call_parameter offset is not in CU for " 14049 "DW_TAG_call_site child DIE %s [in module %s]"), 14050 sect_offset_str (child_die->sect_off), 14051 objfile_name (objfile)); 14052 continue; 14053 } 14054 parameter->u.param_cu_off 14055 = (cu_offset) (sect_off - cu->header.sect_off); 14056 } 14057 else if (loc == NULL || origin != NULL || !loc->form_is_block ()) 14058 { 14059 complaint (_("No DW_FORM_block* DW_AT_location for " 14060 "DW_TAG_call_site child DIE %s [in module %s]"), 14061 sect_offset_str (child_die->sect_off), objfile_name (objfile)); 14062 continue; 14063 } 14064 else 14065 { 14066 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg 14067 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]); 14068 if (parameter->u.dwarf_reg != -1) 14069 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG; 14070 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data, 14071 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size], 14072 ¶meter->u.fb_offset)) 14073 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET; 14074 else 14075 { 14076 complaint (_("Only single DW_OP_reg or DW_OP_fbreg is supported " 14077 "for DW_FORM_block* DW_AT_location is supported for " 14078 "DW_TAG_call_site child DIE %s " 14079 "[in module %s]"), 14080 sect_offset_str (child_die->sect_off), 14081 objfile_name (objfile)); 14082 continue; 14083 } 14084 } 14085 14086 attr = dwarf2_attr (child_die, DW_AT_call_value, cu); 14087 if (attr == NULL) 14088 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu); 14089 if (attr == NULL || !attr->form_is_block ()) 14090 { 14091 complaint (_("No DW_FORM_block* DW_AT_call_value for " 14092 "DW_TAG_call_site child DIE %s [in module %s]"), 14093 sect_offset_str (child_die->sect_off), 14094 objfile_name (objfile)); 14095 continue; 14096 } 14097 parameter->value = DW_BLOCK (attr)->data; 14098 parameter->value_size = DW_BLOCK (attr)->size; 14099 14100 /* Parameters are not pre-cleared by memset above. */ 14101 parameter->data_value = NULL; 14102 parameter->data_value_size = 0; 14103 call_site->parameter_count++; 14104 14105 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu); 14106 if (attr == NULL) 14107 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu); 14108 if (attr != nullptr) 14109 { 14110 if (!attr->form_is_block ()) 14111 complaint (_("No DW_FORM_block* DW_AT_call_data_value for " 14112 "DW_TAG_call_site child DIE %s [in module %s]"), 14113 sect_offset_str (child_die->sect_off), 14114 objfile_name (objfile)); 14115 else 14116 { 14117 parameter->data_value = DW_BLOCK (attr)->data; 14118 parameter->data_value_size = DW_BLOCK (attr)->size; 14119 } 14120 } 14121 } 14122 } 14123 14124 /* Helper function for read_variable. If DIE represents a virtual 14125 table, then return the type of the concrete object that is 14126 associated with the virtual table. Otherwise, return NULL. */ 14127 14128 static struct type * 14129 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu) 14130 { 14131 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu); 14132 if (attr == NULL) 14133 return NULL; 14134 14135 /* Find the type DIE. */ 14136 struct die_info *type_die = NULL; 14137 struct dwarf2_cu *type_cu = cu; 14138 14139 if (attr->form_is_ref ()) 14140 type_die = follow_die_ref (die, attr, &type_cu); 14141 if (type_die == NULL) 14142 return NULL; 14143 14144 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL) 14145 return NULL; 14146 return die_containing_type (type_die, type_cu); 14147 } 14148 14149 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */ 14150 14151 static void 14152 read_variable (struct die_info *die, struct dwarf2_cu *cu) 14153 { 14154 struct rust_vtable_symbol *storage = NULL; 14155 14156 if (cu->language == language_rust) 14157 { 14158 struct type *containing_type = rust_containing_type (die, cu); 14159 14160 if (containing_type != NULL) 14161 { 14162 struct objfile *objfile = cu->per_objfile->objfile; 14163 14164 storage = new (&objfile->objfile_obstack) rust_vtable_symbol; 14165 storage->concrete_type = containing_type; 14166 storage->subclass = SYMBOL_RUST_VTABLE; 14167 } 14168 } 14169 14170 struct symbol *res = new_symbol (die, NULL, cu, storage); 14171 struct attribute *abstract_origin 14172 = dwarf2_attr (die, DW_AT_abstract_origin, cu); 14173 struct attribute *loc = dwarf2_attr (die, DW_AT_location, cu); 14174 if (res == NULL && loc && abstract_origin) 14175 { 14176 /* We have a variable without a name, but with a location and an abstract 14177 origin. This may be a concrete instance of an abstract variable 14178 referenced from an DW_OP_GNU_variable_value, so save it to find it back 14179 later. */ 14180 struct dwarf2_cu *origin_cu = cu; 14181 struct die_info *origin_die 14182 = follow_die_ref (die, abstract_origin, &origin_cu); 14183 dwarf2_per_objfile *per_objfile = cu->per_objfile; 14184 per_objfile->per_bfd->abstract_to_concrete 14185 [origin_die->sect_off].push_back (die->sect_off); 14186 } 14187 } 14188 14189 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET 14190 reading .debug_rnglists. 14191 Callback's type should be: 14192 void (CORE_ADDR range_beginning, CORE_ADDR range_end) 14193 Return true if the attributes are present and valid, otherwise, 14194 return false. */ 14195 14196 template <typename Callback> 14197 static bool 14198 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu, 14199 dwarf_tag tag, Callback &&callback) 14200 { 14201 dwarf2_per_objfile *per_objfile = cu->per_objfile; 14202 struct objfile *objfile = per_objfile->objfile; 14203 bfd *obfd = objfile->obfd; 14204 /* Base address selection entry. */ 14205 gdb::optional<CORE_ADDR> base; 14206 const gdb_byte *buffer; 14207 CORE_ADDR baseaddr; 14208 bool overflow = false; 14209 ULONGEST addr_index; 14210 struct dwarf2_section_info *rnglists_section; 14211 14212 base = cu->base_address; 14213 rnglists_section = cu_debug_rnglists_section (cu, tag); 14214 rnglists_section->read (objfile); 14215 14216 if (offset >= rnglists_section->size) 14217 { 14218 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"), 14219 offset); 14220 return false; 14221 } 14222 buffer = rnglists_section->buffer + offset; 14223 14224 baseaddr = objfile->text_section_offset (); 14225 14226 while (1) 14227 { 14228 /* Initialize it due to a false compiler warning. */ 14229 CORE_ADDR range_beginning = 0, range_end = 0; 14230 const gdb_byte *buf_end = (rnglists_section->buffer 14231 + rnglists_section->size); 14232 unsigned int bytes_read; 14233 14234 if (buffer == buf_end) 14235 { 14236 overflow = true; 14237 break; 14238 } 14239 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++); 14240 switch (rlet) 14241 { 14242 case DW_RLE_end_of_list: 14243 break; 14244 case DW_RLE_base_address: 14245 if (buffer + cu->header.addr_size > buf_end) 14246 { 14247 overflow = true; 14248 break; 14249 } 14250 base = cu->header.read_address (obfd, buffer, &bytes_read); 14251 buffer += bytes_read; 14252 break; 14253 case DW_RLE_base_addressx: 14254 addr_index = read_unsigned_leb128 (obfd, buffer, &bytes_read); 14255 buffer += bytes_read; 14256 base = read_addr_index (cu, addr_index); 14257 break; 14258 case DW_RLE_start_length: 14259 if (buffer + cu->header.addr_size > buf_end) 14260 { 14261 overflow = true; 14262 break; 14263 } 14264 range_beginning = cu->header.read_address (obfd, buffer, 14265 &bytes_read); 14266 buffer += bytes_read; 14267 range_end = (range_beginning 14268 + read_unsigned_leb128 (obfd, buffer, &bytes_read)); 14269 buffer += bytes_read; 14270 if (buffer > buf_end) 14271 { 14272 overflow = true; 14273 break; 14274 } 14275 break; 14276 case DW_RLE_startx_length: 14277 addr_index = read_unsigned_leb128 (obfd, buffer, &bytes_read); 14278 buffer += bytes_read; 14279 range_beginning = read_addr_index (cu, addr_index); 14280 if (buffer > buf_end) 14281 { 14282 overflow = true; 14283 break; 14284 } 14285 range_end = (range_beginning 14286 + read_unsigned_leb128 (obfd, buffer, &bytes_read)); 14287 buffer += bytes_read; 14288 break; 14289 case DW_RLE_offset_pair: 14290 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read); 14291 buffer += bytes_read; 14292 if (buffer > buf_end) 14293 { 14294 overflow = true; 14295 break; 14296 } 14297 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read); 14298 buffer += bytes_read; 14299 if (buffer > buf_end) 14300 { 14301 overflow = true; 14302 break; 14303 } 14304 break; 14305 case DW_RLE_start_end: 14306 if (buffer + 2 * cu->header.addr_size > buf_end) 14307 { 14308 overflow = true; 14309 break; 14310 } 14311 range_beginning = cu->header.read_address (obfd, buffer, 14312 &bytes_read); 14313 buffer += bytes_read; 14314 range_end = cu->header.read_address (obfd, buffer, &bytes_read); 14315 buffer += bytes_read; 14316 break; 14317 case DW_RLE_startx_endx: 14318 addr_index = read_unsigned_leb128 (obfd, buffer, &bytes_read); 14319 buffer += bytes_read; 14320 range_beginning = read_addr_index (cu, addr_index); 14321 if (buffer > buf_end) 14322 { 14323 overflow = true; 14324 break; 14325 } 14326 addr_index = read_unsigned_leb128 (obfd, buffer, &bytes_read); 14327 buffer += bytes_read; 14328 range_end = read_addr_index (cu, addr_index); 14329 break; 14330 default: 14331 complaint (_("Invalid .debug_rnglists data (no base address)")); 14332 return false; 14333 } 14334 if (rlet == DW_RLE_end_of_list || overflow) 14335 break; 14336 if (rlet == DW_RLE_base_address) 14337 continue; 14338 14339 if (range_beginning > range_end) 14340 { 14341 /* Inverted range entries are invalid. */ 14342 complaint (_("Invalid .debug_rnglists data (inverted range)")); 14343 return false; 14344 } 14345 14346 /* Empty range entries have no effect. */ 14347 if (range_beginning == range_end) 14348 continue; 14349 14350 /* Only DW_RLE_offset_pair needs the base address added. */ 14351 if (rlet == DW_RLE_offset_pair) 14352 { 14353 if (!base.has_value ()) 14354 { 14355 /* We have no valid base address for the DW_RLE_offset_pair. */ 14356 complaint (_("Invalid .debug_rnglists data (no base address for " 14357 "DW_RLE_offset_pair)")); 14358 return false; 14359 } 14360 14361 range_beginning += *base; 14362 range_end += *base; 14363 } 14364 14365 /* A not-uncommon case of bad debug info. 14366 Don't pollute the addrmap with bad data. */ 14367 if (range_beginning + baseaddr == 0 14368 && !per_objfile->per_bfd->has_section_at_zero) 14369 { 14370 complaint (_(".debug_rnglists entry has start address of zero" 14371 " [in module %s]"), objfile_name (objfile)); 14372 continue; 14373 } 14374 14375 callback (range_beginning, range_end); 14376 } 14377 14378 if (overflow) 14379 { 14380 complaint (_("Offset %d is not terminated " 14381 "for DW_AT_ranges attribute"), 14382 offset); 14383 return false; 14384 } 14385 14386 return true; 14387 } 14388 14389 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges. 14390 Callback's type should be: 14391 void (CORE_ADDR range_beginning, CORE_ADDR range_end) 14392 Return 1 if the attributes are present and valid, otherwise, return 0. */ 14393 14394 template <typename Callback> 14395 static int 14396 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu, dwarf_tag tag, 14397 Callback &&callback) 14398 { 14399 dwarf2_per_objfile *per_objfile = cu->per_objfile; 14400 struct objfile *objfile = per_objfile->objfile; 14401 struct comp_unit_head *cu_header = &cu->header; 14402 bfd *obfd = objfile->obfd; 14403 unsigned int addr_size = cu_header->addr_size; 14404 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); 14405 /* Base address selection entry. */ 14406 gdb::optional<CORE_ADDR> base; 14407 unsigned int dummy; 14408 const gdb_byte *buffer; 14409 CORE_ADDR baseaddr; 14410 14411 if (cu_header->version >= 5) 14412 return dwarf2_rnglists_process (offset, cu, tag, callback); 14413 14414 base = cu->base_address; 14415 14416 per_objfile->per_bfd->ranges.read (objfile); 14417 if (offset >= per_objfile->per_bfd->ranges.size) 14418 { 14419 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"), 14420 offset); 14421 return 0; 14422 } 14423 buffer = per_objfile->per_bfd->ranges.buffer + offset; 14424 14425 baseaddr = objfile->text_section_offset (); 14426 14427 while (1) 14428 { 14429 CORE_ADDR range_beginning, range_end; 14430 14431 range_beginning = cu->header.read_address (obfd, buffer, &dummy); 14432 buffer += addr_size; 14433 range_end = cu->header.read_address (obfd, buffer, &dummy); 14434 buffer += addr_size; 14435 offset += 2 * addr_size; 14436 14437 /* An end of list marker is a pair of zero addresses. */ 14438 if (range_beginning == 0 && range_end == 0) 14439 /* Found the end of list entry. */ 14440 break; 14441 14442 /* Each base address selection entry is a pair of 2 values. 14443 The first is the largest possible address, the second is 14444 the base address. Check for a base address here. */ 14445 if ((range_beginning & mask) == mask) 14446 { 14447 /* If we found the largest possible address, then we already 14448 have the base address in range_end. */ 14449 base = range_end; 14450 continue; 14451 } 14452 14453 if (!base.has_value ()) 14454 { 14455 /* We have no valid base address for the ranges 14456 data. */ 14457 complaint (_("Invalid .debug_ranges data (no base address)")); 14458 return 0; 14459 } 14460 14461 if (range_beginning > range_end) 14462 { 14463 /* Inverted range entries are invalid. */ 14464 complaint (_("Invalid .debug_ranges data (inverted range)")); 14465 return 0; 14466 } 14467 14468 /* Empty range entries have no effect. */ 14469 if (range_beginning == range_end) 14470 continue; 14471 14472 range_beginning += *base; 14473 range_end += *base; 14474 14475 /* A not-uncommon case of bad debug info. 14476 Don't pollute the addrmap with bad data. */ 14477 if (range_beginning + baseaddr == 0 14478 && !per_objfile->per_bfd->has_section_at_zero) 14479 { 14480 complaint (_(".debug_ranges entry has start address of zero" 14481 " [in module %s]"), objfile_name (objfile)); 14482 continue; 14483 } 14484 14485 callback (range_beginning, range_end); 14486 } 14487 14488 return 1; 14489 } 14490 14491 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET. 14492 Return 1 if the attributes are present and valid, otherwise, return 0. 14493 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */ 14494 14495 static int 14496 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return, 14497 CORE_ADDR *high_return, struct dwarf2_cu *cu, 14498 dwarf2_psymtab *ranges_pst, dwarf_tag tag) 14499 { 14500 struct objfile *objfile = cu->per_objfile->objfile; 14501 struct gdbarch *gdbarch = objfile->arch (); 14502 const CORE_ADDR baseaddr = objfile->text_section_offset (); 14503 int low_set = 0; 14504 CORE_ADDR low = 0; 14505 CORE_ADDR high = 0; 14506 int retval; 14507 14508 retval = dwarf2_ranges_process (offset, cu, tag, 14509 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end) 14510 { 14511 if (ranges_pst != NULL) 14512 { 14513 CORE_ADDR lowpc; 14514 CORE_ADDR highpc; 14515 14516 lowpc = (gdbarch_adjust_dwarf2_addr (gdbarch, 14517 range_beginning + baseaddr) 14518 - baseaddr); 14519 highpc = (gdbarch_adjust_dwarf2_addr (gdbarch, 14520 range_end + baseaddr) 14521 - baseaddr); 14522 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap, 14523 lowpc, highpc - 1, ranges_pst); 14524 } 14525 14526 /* FIXME: This is recording everything as a low-high 14527 segment of consecutive addresses. We should have a 14528 data structure for discontiguous block ranges 14529 instead. */ 14530 if (! low_set) 14531 { 14532 low = range_beginning; 14533 high = range_end; 14534 low_set = 1; 14535 } 14536 else 14537 { 14538 if (range_beginning < low) 14539 low = range_beginning; 14540 if (range_end > high) 14541 high = range_end; 14542 } 14543 }); 14544 if (!retval) 14545 return 0; 14546 14547 if (! low_set) 14548 /* If the first entry is an end-of-list marker, the range 14549 describes an empty scope, i.e. no instructions. */ 14550 return 0; 14551 14552 if (low_return) 14553 *low_return = low; 14554 if (high_return) 14555 *high_return = high; 14556 return 1; 14557 } 14558 14559 /* Get low and high pc attributes from a die. See enum pc_bounds_kind 14560 definition for the return value. *LOWPC and *HIGHPC are set iff 14561 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */ 14562 14563 static enum pc_bounds_kind 14564 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, 14565 CORE_ADDR *highpc, struct dwarf2_cu *cu, 14566 dwarf2_psymtab *pst) 14567 { 14568 dwarf2_per_objfile *per_objfile = cu->per_objfile; 14569 struct attribute *attr; 14570 struct attribute *attr_high; 14571 CORE_ADDR low = 0; 14572 CORE_ADDR high = 0; 14573 enum pc_bounds_kind ret; 14574 14575 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu); 14576 if (attr_high) 14577 { 14578 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 14579 if (attr != nullptr) 14580 { 14581 low = attr->value_as_address (); 14582 high = attr_high->value_as_address (); 14583 if (cu->header.version >= 4 && attr_high->form_is_constant ()) 14584 high += low; 14585 } 14586 else 14587 /* Found high w/o low attribute. */ 14588 return PC_BOUNDS_INVALID; 14589 14590 /* Found consecutive range of addresses. */ 14591 ret = PC_BOUNDS_HIGH_LOW; 14592 } 14593 else 14594 { 14595 attr = dwarf2_attr (die, DW_AT_ranges, cu); 14596 if (attr != NULL) 14597 { 14598 /* DW_AT_rnglists_base does not apply to DIEs from the DWO skeleton. 14599 We take advantage of the fact that DW_AT_ranges does not appear 14600 in DW_TAG_compile_unit of DWO files. 14601 14602 Attributes of the form DW_FORM_rnglistx have already had their 14603 value changed by read_rnglist_index and already include 14604 DW_AT_rnglists_base, so don't need to add the ranges base, 14605 either. */ 14606 int need_ranges_base = (die->tag != DW_TAG_compile_unit 14607 && attr->form != DW_FORM_rnglistx); 14608 unsigned int ranges_offset = (DW_UNSND (attr) 14609 + (need_ranges_base 14610 ? cu->ranges_base 14611 : 0)); 14612 14613 /* Value of the DW_AT_ranges attribute is the offset in the 14614 .debug_ranges section. */ 14615 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst, 14616 die->tag)) 14617 return PC_BOUNDS_INVALID; 14618 /* Found discontinuous range of addresses. */ 14619 ret = PC_BOUNDS_RANGES; 14620 } 14621 else 14622 return PC_BOUNDS_NOT_PRESENT; 14623 } 14624 14625 /* partial_die_info::read has also the strict LOW < HIGH requirement. */ 14626 if (high <= low) 14627 return PC_BOUNDS_INVALID; 14628 14629 /* When using the GNU linker, .gnu.linkonce. sections are used to 14630 eliminate duplicate copies of functions and vtables and such. 14631 The linker will arbitrarily choose one and discard the others. 14632 The AT_*_pc values for such functions refer to local labels in 14633 these sections. If the section from that file was discarded, the 14634 labels are not in the output, so the relocs get a value of 0. 14635 If this is a discarded function, mark the pc bounds as invalid, 14636 so that GDB will ignore it. */ 14637 if (low == 0 && !per_objfile->per_bfd->has_section_at_zero) 14638 return PC_BOUNDS_INVALID; 14639 14640 *lowpc = low; 14641 if (highpc) 14642 *highpc = high; 14643 return ret; 14644 } 14645 14646 /* Assuming that DIE represents a subprogram DIE or a lexical block, get 14647 its low and high PC addresses. Do nothing if these addresses could not 14648 be determined. Otherwise, set LOWPC to the low address if it is smaller, 14649 and HIGHPC to the high address if greater than HIGHPC. */ 14650 14651 static void 14652 dwarf2_get_subprogram_pc_bounds (struct die_info *die, 14653 CORE_ADDR *lowpc, CORE_ADDR *highpc, 14654 struct dwarf2_cu *cu) 14655 { 14656 CORE_ADDR low, high; 14657 struct die_info *child = die->child; 14658 14659 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES) 14660 { 14661 *lowpc = std::min (*lowpc, low); 14662 *highpc = std::max (*highpc, high); 14663 } 14664 14665 /* If the language does not allow nested subprograms (either inside 14666 subprograms or lexical blocks), we're done. */ 14667 if (cu->language != language_ada) 14668 return; 14669 14670 /* Check all the children of the given DIE. If it contains nested 14671 subprograms, then check their pc bounds. Likewise, we need to 14672 check lexical blocks as well, as they may also contain subprogram 14673 definitions. */ 14674 while (child && child->tag) 14675 { 14676 if (child->tag == DW_TAG_subprogram 14677 || child->tag == DW_TAG_lexical_block) 14678 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu); 14679 child = child->sibling; 14680 } 14681 } 14682 14683 /* Get the low and high pc's represented by the scope DIE, and store 14684 them in *LOWPC and *HIGHPC. If the correct values can't be 14685 determined, set *LOWPC to -1 and *HIGHPC to 0. */ 14686 14687 static void 14688 get_scope_pc_bounds (struct die_info *die, 14689 CORE_ADDR *lowpc, CORE_ADDR *highpc, 14690 struct dwarf2_cu *cu) 14691 { 14692 CORE_ADDR best_low = (CORE_ADDR) -1; 14693 CORE_ADDR best_high = (CORE_ADDR) 0; 14694 CORE_ADDR current_low, current_high; 14695 14696 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL) 14697 >= PC_BOUNDS_RANGES) 14698 { 14699 best_low = current_low; 14700 best_high = current_high; 14701 } 14702 else 14703 { 14704 struct die_info *child = die->child; 14705 14706 while (child && child->tag) 14707 { 14708 switch (child->tag) { 14709 case DW_TAG_subprogram: 14710 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu); 14711 break; 14712 case DW_TAG_namespace: 14713 case DW_TAG_module: 14714 /* FIXME: carlton/2004-01-16: Should we do this for 14715 DW_TAG_class_type/DW_TAG_structure_type, too? I think 14716 that current GCC's always emit the DIEs corresponding 14717 to definitions of methods of classes as children of a 14718 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to 14719 the DIEs giving the declarations, which could be 14720 anywhere). But I don't see any reason why the 14721 standards says that they have to be there. */ 14722 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu); 14723 14724 if (current_low != ((CORE_ADDR) -1)) 14725 { 14726 best_low = std::min (best_low, current_low); 14727 best_high = std::max (best_high, current_high); 14728 } 14729 break; 14730 default: 14731 /* Ignore. */ 14732 break; 14733 } 14734 14735 child = child->sibling; 14736 } 14737 } 14738 14739 *lowpc = best_low; 14740 *highpc = best_high; 14741 } 14742 14743 /* Record the address ranges for BLOCK, offset by BASEADDR, as given 14744 in DIE. */ 14745 14746 static void 14747 dwarf2_record_block_ranges (struct die_info *die, struct block *block, 14748 CORE_ADDR baseaddr, struct dwarf2_cu *cu) 14749 { 14750 struct objfile *objfile = cu->per_objfile->objfile; 14751 struct gdbarch *gdbarch = objfile->arch (); 14752 struct attribute *attr; 14753 struct attribute *attr_high; 14754 14755 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu); 14756 if (attr_high) 14757 { 14758 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 14759 if (attr != nullptr) 14760 { 14761 CORE_ADDR low = attr->value_as_address (); 14762 CORE_ADDR high = attr_high->value_as_address (); 14763 14764 if (cu->header.version >= 4 && attr_high->form_is_constant ()) 14765 high += low; 14766 14767 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr); 14768 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr); 14769 cu->get_builder ()->record_block_range (block, low, high - 1); 14770 } 14771 } 14772 14773 attr = dwarf2_attr (die, DW_AT_ranges, cu); 14774 if (attr != nullptr) 14775 { 14776 /* DW_AT_rnglists_base does not apply to DIEs from the DWO skeleton. 14777 We take advantage of the fact that DW_AT_ranges does not appear 14778 in DW_TAG_compile_unit of DWO files. 14779 14780 Attributes of the form DW_FORM_rnglistx have already had their 14781 value changed by read_rnglist_index and already include 14782 DW_AT_rnglists_base, so don't need to add the ranges base, 14783 either. */ 14784 int need_ranges_base = (die->tag != DW_TAG_compile_unit 14785 && attr->form != DW_FORM_rnglistx); 14786 14787 /* The value of the DW_AT_ranges attribute is the offset of the 14788 address range list in the .debug_ranges section. */ 14789 unsigned long offset = (DW_UNSND (attr) 14790 + (need_ranges_base ? cu->ranges_base : 0)); 14791 14792 std::vector<blockrange> blockvec; 14793 dwarf2_ranges_process (offset, cu, die->tag, 14794 [&] (CORE_ADDR start, CORE_ADDR end) 14795 { 14796 start += baseaddr; 14797 end += baseaddr; 14798 start = gdbarch_adjust_dwarf2_addr (gdbarch, start); 14799 end = gdbarch_adjust_dwarf2_addr (gdbarch, end); 14800 cu->get_builder ()->record_block_range (block, start, end - 1); 14801 blockvec.emplace_back (start, end); 14802 }); 14803 14804 BLOCK_RANGES(block) = make_blockranges (objfile, blockvec); 14805 } 14806 } 14807 14808 /* Check whether the producer field indicates either of GCC < 4.6, or the 14809 Intel C/C++ compiler, and cache the result in CU. */ 14810 14811 static void 14812 check_producer (struct dwarf2_cu *cu) 14813 { 14814 int major, minor; 14815 14816 if (cu->producer == NULL) 14817 { 14818 /* For unknown compilers expect their behavior is DWARF version 14819 compliant. 14820 14821 GCC started to support .debug_types sections by -gdwarf-4 since 14822 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer 14823 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4 14824 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility 14825 interpreted incorrectly by GDB now - GCC PR debug/48229. */ 14826 } 14827 else if (producer_is_gcc (cu->producer, &major, &minor)) 14828 { 14829 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6); 14830 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3); 14831 } 14832 else if (producer_is_icc (cu->producer, &major, &minor)) 14833 { 14834 cu->producer_is_icc = true; 14835 cu->producer_is_icc_lt_14 = major < 14; 14836 } 14837 else if (startswith (cu->producer, "CodeWarrior S12/L-ISA")) 14838 cu->producer_is_codewarrior = true; 14839 else 14840 { 14841 /* For other non-GCC compilers, expect their behavior is DWARF version 14842 compliant. */ 14843 } 14844 14845 cu->checked_producer = true; 14846 } 14847 14848 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up 14849 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed 14850 during 4.6.0 experimental. */ 14851 14852 static bool 14853 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu) 14854 { 14855 if (!cu->checked_producer) 14856 check_producer (cu); 14857 14858 return cu->producer_is_gxx_lt_4_6; 14859 } 14860 14861 14862 /* Codewarrior (at least as of version 5.0.40) generates dwarf line information 14863 with incorrect is_stmt attributes. */ 14864 14865 static bool 14866 producer_is_codewarrior (struct dwarf2_cu *cu) 14867 { 14868 if (!cu->checked_producer) 14869 check_producer (cu); 14870 14871 return cu->producer_is_codewarrior; 14872 } 14873 14874 /* Return the default accessibility type if it is not overridden by 14875 DW_AT_accessibility. */ 14876 14877 static enum dwarf_access_attribute 14878 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu) 14879 { 14880 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu)) 14881 { 14882 /* The default DWARF 2 accessibility for members is public, the default 14883 accessibility for inheritance is private. */ 14884 14885 if (die->tag != DW_TAG_inheritance) 14886 return DW_ACCESS_public; 14887 else 14888 return DW_ACCESS_private; 14889 } 14890 else 14891 { 14892 /* DWARF 3+ defines the default accessibility a different way. The same 14893 rules apply now for DW_TAG_inheritance as for the members and it only 14894 depends on the container kind. */ 14895 14896 if (die->parent->tag == DW_TAG_class_type) 14897 return DW_ACCESS_private; 14898 else 14899 return DW_ACCESS_public; 14900 } 14901 } 14902 14903 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte 14904 offset. If the attribute was not found return 0, otherwise return 14905 1. If it was found but could not properly be handled, set *OFFSET 14906 to 0. */ 14907 14908 static int 14909 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu, 14910 LONGEST *offset) 14911 { 14912 struct attribute *attr; 14913 14914 attr = dwarf2_attr (die, DW_AT_data_member_location, cu); 14915 if (attr != NULL) 14916 { 14917 *offset = 0; 14918 14919 /* Note that we do not check for a section offset first here. 14920 This is because DW_AT_data_member_location is new in DWARF 4, 14921 so if we see it, we can assume that a constant form is really 14922 a constant and not a section offset. */ 14923 if (attr->form_is_constant ()) 14924 *offset = attr->constant_value (0); 14925 else if (attr->form_is_section_offset ()) 14926 dwarf2_complex_location_expr_complaint (); 14927 else if (attr->form_is_block ()) 14928 *offset = decode_locdesc (DW_BLOCK (attr), cu); 14929 else 14930 dwarf2_complex_location_expr_complaint (); 14931 14932 return 1; 14933 } 14934 14935 return 0; 14936 } 14937 14938 /* Look for DW_AT_data_member_location and store the results in FIELD. */ 14939 14940 static void 14941 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu, 14942 struct field *field) 14943 { 14944 struct attribute *attr; 14945 14946 attr = dwarf2_attr (die, DW_AT_data_member_location, cu); 14947 if (attr != NULL) 14948 { 14949 if (attr->form_is_constant ()) 14950 { 14951 LONGEST offset = attr->constant_value (0); 14952 SET_FIELD_BITPOS (*field, offset * bits_per_byte); 14953 } 14954 else if (attr->form_is_section_offset ()) 14955 dwarf2_complex_location_expr_complaint (); 14956 else if (attr->form_is_block ()) 14957 { 14958 bool handled; 14959 CORE_ADDR offset = decode_locdesc (DW_BLOCK (attr), cu, &handled); 14960 if (handled) 14961 SET_FIELD_BITPOS (*field, offset * bits_per_byte); 14962 else 14963 { 14964 dwarf2_per_objfile *per_objfile = cu->per_objfile; 14965 struct objfile *objfile = per_objfile->objfile; 14966 struct dwarf2_locexpr_baton *dlbaton 14967 = XOBNEW (&objfile->objfile_obstack, 14968 struct dwarf2_locexpr_baton); 14969 dlbaton->data = DW_BLOCK (attr)->data; 14970 dlbaton->size = DW_BLOCK (attr)->size; 14971 /* When using this baton, we want to compute the address 14972 of the field, not the value. This is why 14973 is_reference is set to false here. */ 14974 dlbaton->is_reference = false; 14975 dlbaton->per_objfile = per_objfile; 14976 dlbaton->per_cu = cu->per_cu; 14977 14978 SET_FIELD_DWARF_BLOCK (*field, dlbaton); 14979 } 14980 } 14981 else 14982 dwarf2_complex_location_expr_complaint (); 14983 } 14984 } 14985 14986 /* Add an aggregate field to the field list. */ 14987 14988 static void 14989 dwarf2_add_field (struct field_info *fip, struct die_info *die, 14990 struct dwarf2_cu *cu) 14991 { 14992 struct objfile *objfile = cu->per_objfile->objfile; 14993 struct gdbarch *gdbarch = objfile->arch (); 14994 struct nextfield *new_field; 14995 struct attribute *attr; 14996 struct field *fp; 14997 const char *fieldname = ""; 14998 14999 if (die->tag == DW_TAG_inheritance) 15000 { 15001 fip->baseclasses.emplace_back (); 15002 new_field = &fip->baseclasses.back (); 15003 } 15004 else 15005 { 15006 fip->fields.emplace_back (); 15007 new_field = &fip->fields.back (); 15008 } 15009 15010 new_field->offset = die->sect_off; 15011 15012 attr = dwarf2_attr (die, DW_AT_accessibility, cu); 15013 if (attr != nullptr) 15014 new_field->accessibility = DW_UNSND (attr); 15015 else 15016 new_field->accessibility = dwarf2_default_access_attribute (die, cu); 15017 if (new_field->accessibility != DW_ACCESS_public) 15018 fip->non_public_fields = true; 15019 15020 attr = dwarf2_attr (die, DW_AT_virtuality, cu); 15021 if (attr != nullptr) 15022 new_field->virtuality = DW_UNSND (attr); 15023 else 15024 new_field->virtuality = DW_VIRTUALITY_none; 15025 15026 fp = &new_field->field; 15027 15028 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu)) 15029 { 15030 /* Data member other than a C++ static data member. */ 15031 15032 /* Get type of field. */ 15033 fp->set_type (die_type (die, cu)); 15034 15035 SET_FIELD_BITPOS (*fp, 0); 15036 15037 /* Get bit size of field (zero if none). */ 15038 attr = dwarf2_attr (die, DW_AT_bit_size, cu); 15039 if (attr != nullptr) 15040 { 15041 FIELD_BITSIZE (*fp) = DW_UNSND (attr); 15042 } 15043 else 15044 { 15045 FIELD_BITSIZE (*fp) = 0; 15046 } 15047 15048 /* Get bit offset of field. */ 15049 handle_data_member_location (die, cu, fp); 15050 attr = dwarf2_attr (die, DW_AT_bit_offset, cu); 15051 if (attr != nullptr) 15052 { 15053 if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) 15054 { 15055 /* For big endian bits, the DW_AT_bit_offset gives the 15056 additional bit offset from the MSB of the containing 15057 anonymous object to the MSB of the field. We don't 15058 have to do anything special since we don't need to 15059 know the size of the anonymous object. */ 15060 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr)); 15061 } 15062 else 15063 { 15064 /* For little endian bits, compute the bit offset to the 15065 MSB of the anonymous object, subtract off the number of 15066 bits from the MSB of the field to the MSB of the 15067 object, and then subtract off the number of bits of 15068 the field itself. The result is the bit offset of 15069 the LSB of the field. */ 15070 int anonymous_size; 15071 int bit_offset = DW_UNSND (attr); 15072 15073 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 15074 if (attr != nullptr) 15075 { 15076 /* The size of the anonymous object containing 15077 the bit field is explicit, so use the 15078 indicated size (in bytes). */ 15079 anonymous_size = DW_UNSND (attr); 15080 } 15081 else 15082 { 15083 /* The size of the anonymous object containing 15084 the bit field must be inferred from the type 15085 attribute of the data member containing the 15086 bit field. */ 15087 anonymous_size = TYPE_LENGTH (fp->type ()); 15088 } 15089 SET_FIELD_BITPOS (*fp, 15090 (FIELD_BITPOS (*fp) 15091 + anonymous_size * bits_per_byte 15092 - bit_offset - FIELD_BITSIZE (*fp))); 15093 } 15094 } 15095 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu); 15096 if (attr != NULL) 15097 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp) 15098 + attr->constant_value (0))); 15099 15100 /* Get name of field. */ 15101 fieldname = dwarf2_name (die, cu); 15102 if (fieldname == NULL) 15103 fieldname = ""; 15104 15105 /* The name is already allocated along with this objfile, so we don't 15106 need to duplicate it for the type. */ 15107 fp->name = fieldname; 15108 15109 /* Change accessibility for artificial fields (e.g. virtual table 15110 pointer or virtual base class pointer) to private. */ 15111 if (dwarf2_attr (die, DW_AT_artificial, cu)) 15112 { 15113 FIELD_ARTIFICIAL (*fp) = 1; 15114 new_field->accessibility = DW_ACCESS_private; 15115 fip->non_public_fields = true; 15116 } 15117 } 15118 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable) 15119 { 15120 /* C++ static member. */ 15121 15122 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that 15123 is a declaration, but all versions of G++ as of this writing 15124 (so through at least 3.2.1) incorrectly generate 15125 DW_TAG_variable tags. */ 15126 15127 const char *physname; 15128 15129 /* Get name of field. */ 15130 fieldname = dwarf2_name (die, cu); 15131 if (fieldname == NULL) 15132 return; 15133 15134 attr = dwarf2_attr (die, DW_AT_const_value, cu); 15135 if (attr 15136 /* Only create a symbol if this is an external value. 15137 new_symbol checks this and puts the value in the global symbol 15138 table, which we want. If it is not external, new_symbol 15139 will try to put the value in cu->list_in_scope which is wrong. */ 15140 && dwarf2_flag_true_p (die, DW_AT_external, cu)) 15141 { 15142 /* A static const member, not much different than an enum as far as 15143 we're concerned, except that we can support more types. */ 15144 new_symbol (die, NULL, cu); 15145 } 15146 15147 /* Get physical name. */ 15148 physname = dwarf2_physname (fieldname, die, cu); 15149 15150 /* The name is already allocated along with this objfile, so we don't 15151 need to duplicate it for the type. */ 15152 SET_FIELD_PHYSNAME (*fp, physname ? physname : ""); 15153 fp->set_type (die_type (die, cu)); 15154 FIELD_NAME (*fp) = fieldname; 15155 } 15156 else if (die->tag == DW_TAG_inheritance) 15157 { 15158 /* C++ base class field. */ 15159 handle_data_member_location (die, cu, fp); 15160 FIELD_BITSIZE (*fp) = 0; 15161 fp->set_type (die_type (die, cu)); 15162 FIELD_NAME (*fp) = fp->type ()->name (); 15163 } 15164 else 15165 gdb_assert_not_reached ("missing case in dwarf2_add_field"); 15166 } 15167 15168 /* Can the type given by DIE define another type? */ 15169 15170 static bool 15171 type_can_define_types (const struct die_info *die) 15172 { 15173 switch (die->tag) 15174 { 15175 case DW_TAG_typedef: 15176 case DW_TAG_class_type: 15177 case DW_TAG_structure_type: 15178 case DW_TAG_union_type: 15179 case DW_TAG_enumeration_type: 15180 return true; 15181 15182 default: 15183 return false; 15184 } 15185 } 15186 15187 /* Add a type definition defined in the scope of the FIP's class. */ 15188 15189 static void 15190 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die, 15191 struct dwarf2_cu *cu) 15192 { 15193 struct decl_field fp; 15194 memset (&fp, 0, sizeof (fp)); 15195 15196 gdb_assert (type_can_define_types (die)); 15197 15198 /* Get name of field. NULL is okay here, meaning an anonymous type. */ 15199 fp.name = dwarf2_name (die, cu); 15200 fp.type = read_type_die (die, cu); 15201 15202 /* Save accessibility. */ 15203 enum dwarf_access_attribute accessibility; 15204 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu); 15205 if (attr != NULL) 15206 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr); 15207 else 15208 accessibility = dwarf2_default_access_attribute (die, cu); 15209 switch (accessibility) 15210 { 15211 case DW_ACCESS_public: 15212 /* The assumed value if neither private nor protected. */ 15213 break; 15214 case DW_ACCESS_private: 15215 fp.is_private = 1; 15216 break; 15217 case DW_ACCESS_protected: 15218 fp.is_protected = 1; 15219 break; 15220 default: 15221 complaint (_("Unhandled DW_AT_accessibility value (%x)"), accessibility); 15222 } 15223 15224 if (die->tag == DW_TAG_typedef) 15225 fip->typedef_field_list.push_back (fp); 15226 else 15227 fip->nested_types_list.push_back (fp); 15228 } 15229 15230 /* A convenience typedef that's used when finding the discriminant 15231 field for a variant part. */ 15232 typedef std::unordered_map<sect_offset, int, gdb::hash_enum<sect_offset>> 15233 offset_map_type; 15234 15235 /* Compute the discriminant range for a given variant. OBSTACK is 15236 where the results will be stored. VARIANT is the variant to 15237 process. IS_UNSIGNED indicates whether the discriminant is signed 15238 or unsigned. */ 15239 15240 static const gdb::array_view<discriminant_range> 15241 convert_variant_range (struct obstack *obstack, const variant_field &variant, 15242 bool is_unsigned) 15243 { 15244 std::vector<discriminant_range> ranges; 15245 15246 if (variant.default_branch) 15247 return {}; 15248 15249 if (variant.discr_list_data == nullptr) 15250 { 15251 discriminant_range r 15252 = {variant.discriminant_value, variant.discriminant_value}; 15253 ranges.push_back (r); 15254 } 15255 else 15256 { 15257 gdb::array_view<const gdb_byte> data (variant.discr_list_data->data, 15258 variant.discr_list_data->size); 15259 while (!data.empty ()) 15260 { 15261 if (data[0] != DW_DSC_range && data[0] != DW_DSC_label) 15262 { 15263 complaint (_("invalid discriminant marker: %d"), data[0]); 15264 break; 15265 } 15266 bool is_range = data[0] == DW_DSC_range; 15267 data = data.slice (1); 15268 15269 ULONGEST low, high; 15270 unsigned int bytes_read; 15271 15272 if (data.empty ()) 15273 { 15274 complaint (_("DW_AT_discr_list missing low value")); 15275 break; 15276 } 15277 if (is_unsigned) 15278 low = read_unsigned_leb128 (nullptr, data.data (), &bytes_read); 15279 else 15280 low = (ULONGEST) read_signed_leb128 (nullptr, data.data (), 15281 &bytes_read); 15282 data = data.slice (bytes_read); 15283 15284 if (is_range) 15285 { 15286 if (data.empty ()) 15287 { 15288 complaint (_("DW_AT_discr_list missing high value")); 15289 break; 15290 } 15291 if (is_unsigned) 15292 high = read_unsigned_leb128 (nullptr, data.data (), 15293 &bytes_read); 15294 else 15295 high = (LONGEST) read_signed_leb128 (nullptr, data.data (), 15296 &bytes_read); 15297 data = data.slice (bytes_read); 15298 } 15299 else 15300 high = low; 15301 15302 ranges.push_back ({ low, high }); 15303 } 15304 } 15305 15306 discriminant_range *result = XOBNEWVEC (obstack, discriminant_range, 15307 ranges.size ()); 15308 std::copy (ranges.begin (), ranges.end (), result); 15309 return gdb::array_view<discriminant_range> (result, ranges.size ()); 15310 } 15311 15312 static const gdb::array_view<variant_part> create_variant_parts 15313 (struct obstack *obstack, 15314 const offset_map_type &offset_map, 15315 struct field_info *fi, 15316 const std::vector<variant_part_builder> &variant_parts); 15317 15318 /* Fill in a "struct variant" for a given variant field. RESULT is 15319 the variant to fill in. OBSTACK is where any needed allocations 15320 will be done. OFFSET_MAP holds the mapping from section offsets to 15321 fields for the type. FI describes the fields of the type we're 15322 processing. FIELD is the variant field we're converting. */ 15323 15324 static void 15325 create_one_variant (variant &result, struct obstack *obstack, 15326 const offset_map_type &offset_map, 15327 struct field_info *fi, const variant_field &field) 15328 { 15329 result.discriminants = convert_variant_range (obstack, field, false); 15330 result.first_field = field.first_field + fi->baseclasses.size (); 15331 result.last_field = field.last_field + fi->baseclasses.size (); 15332 result.parts = create_variant_parts (obstack, offset_map, fi, 15333 field.variant_parts); 15334 } 15335 15336 /* Fill in a "struct variant_part" for a given variant part. RESULT 15337 is the variant part to fill in. OBSTACK is where any needed 15338 allocations will be done. OFFSET_MAP holds the mapping from 15339 section offsets to fields for the type. FI describes the fields of 15340 the type we're processing. BUILDER is the variant part to be 15341 converted. */ 15342 15343 static void 15344 create_one_variant_part (variant_part &result, 15345 struct obstack *obstack, 15346 const offset_map_type &offset_map, 15347 struct field_info *fi, 15348 const variant_part_builder &builder) 15349 { 15350 auto iter = offset_map.find (builder.discriminant_offset); 15351 if (iter == offset_map.end ()) 15352 { 15353 result.discriminant_index = -1; 15354 /* Doesn't matter. */ 15355 result.is_unsigned = false; 15356 } 15357 else 15358 { 15359 result.discriminant_index = iter->second; 15360 result.is_unsigned 15361 = TYPE_UNSIGNED (fi->fields[result.discriminant_index].field.type ()); 15362 } 15363 15364 size_t n = builder.variants.size (); 15365 variant *output = new (obstack) variant[n]; 15366 for (size_t i = 0; i < n; ++i) 15367 create_one_variant (output[i], obstack, offset_map, fi, 15368 builder.variants[i]); 15369 15370 result.variants = gdb::array_view<variant> (output, n); 15371 } 15372 15373 /* Create a vector of variant parts that can be attached to a type. 15374 OBSTACK is where any needed allocations will be done. OFFSET_MAP 15375 holds the mapping from section offsets to fields for the type. FI 15376 describes the fields of the type we're processing. VARIANT_PARTS 15377 is the vector to convert. */ 15378 15379 static const gdb::array_view<variant_part> 15380 create_variant_parts (struct obstack *obstack, 15381 const offset_map_type &offset_map, 15382 struct field_info *fi, 15383 const std::vector<variant_part_builder> &variant_parts) 15384 { 15385 if (variant_parts.empty ()) 15386 return {}; 15387 15388 size_t n = variant_parts.size (); 15389 variant_part *result = new (obstack) variant_part[n]; 15390 for (size_t i = 0; i < n; ++i) 15391 create_one_variant_part (result[i], obstack, offset_map, fi, 15392 variant_parts[i]); 15393 15394 return gdb::array_view<variant_part> (result, n); 15395 } 15396 15397 /* Compute the variant part vector for FIP, attaching it to TYPE when 15398 done. */ 15399 15400 static void 15401 add_variant_property (struct field_info *fip, struct type *type, 15402 struct dwarf2_cu *cu) 15403 { 15404 /* Map section offsets of fields to their field index. Note the 15405 field index here does not take the number of baseclasses into 15406 account. */ 15407 offset_map_type offset_map; 15408 for (int i = 0; i < fip->fields.size (); ++i) 15409 offset_map[fip->fields[i].offset] = i; 15410 15411 struct objfile *objfile = cu->per_objfile->objfile; 15412 gdb::array_view<variant_part> parts 15413 = create_variant_parts (&objfile->objfile_obstack, offset_map, fip, 15414 fip->variant_parts); 15415 15416 struct dynamic_prop prop; 15417 prop.set_variant_parts ((gdb::array_view<variant_part> *) 15418 obstack_copy (&objfile->objfile_obstack, &parts, 15419 sizeof (parts))); 15420 15421 type->add_dyn_prop (DYN_PROP_VARIANT_PARTS, prop); 15422 } 15423 15424 /* Create the vector of fields, and attach it to the type. */ 15425 15426 static void 15427 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type, 15428 struct dwarf2_cu *cu) 15429 { 15430 int nfields = fip->nfields (); 15431 15432 /* Record the field count, allocate space for the array of fields, 15433 and create blank accessibility bitfields if necessary. */ 15434 type->set_num_fields (nfields); 15435 type->set_fields 15436 ((struct field *) TYPE_ZALLOC (type, sizeof (struct field) * nfields)); 15437 15438 if (fip->non_public_fields && cu->language != language_ada) 15439 { 15440 ALLOCATE_CPLUS_STRUCT_TYPE (type); 15441 15442 TYPE_FIELD_PRIVATE_BITS (type) = 15443 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); 15444 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields); 15445 15446 TYPE_FIELD_PROTECTED_BITS (type) = 15447 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); 15448 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields); 15449 15450 TYPE_FIELD_IGNORE_BITS (type) = 15451 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); 15452 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields); 15453 } 15454 15455 /* If the type has baseclasses, allocate and clear a bit vector for 15456 TYPE_FIELD_VIRTUAL_BITS. */ 15457 if (!fip->baseclasses.empty () && cu->language != language_ada) 15458 { 15459 int num_bytes = B_BYTES (fip->baseclasses.size ()); 15460 unsigned char *pointer; 15461 15462 ALLOCATE_CPLUS_STRUCT_TYPE (type); 15463 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes); 15464 TYPE_FIELD_VIRTUAL_BITS (type) = pointer; 15465 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ()); 15466 TYPE_N_BASECLASSES (type) = fip->baseclasses.size (); 15467 } 15468 15469 if (!fip->variant_parts.empty ()) 15470 add_variant_property (fip, type, cu); 15471 15472 /* Copy the saved-up fields into the field vector. */ 15473 for (int i = 0; i < nfields; ++i) 15474 { 15475 struct nextfield &field 15476 = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i] 15477 : fip->fields[i - fip->baseclasses.size ()]); 15478 15479 type->field (i) = field.field; 15480 switch (field.accessibility) 15481 { 15482 case DW_ACCESS_private: 15483 if (cu->language != language_ada) 15484 SET_TYPE_FIELD_PRIVATE (type, i); 15485 break; 15486 15487 case DW_ACCESS_protected: 15488 if (cu->language != language_ada) 15489 SET_TYPE_FIELD_PROTECTED (type, i); 15490 break; 15491 15492 case DW_ACCESS_public: 15493 break; 15494 15495 default: 15496 /* Unknown accessibility. Complain and treat it as public. */ 15497 { 15498 complaint (_("unsupported accessibility %d"), 15499 field.accessibility); 15500 } 15501 break; 15502 } 15503 if (i < fip->baseclasses.size ()) 15504 { 15505 switch (field.virtuality) 15506 { 15507 case DW_VIRTUALITY_virtual: 15508 case DW_VIRTUALITY_pure_virtual: 15509 if (cu->language == language_ada) 15510 error (_("unexpected virtuality in component of Ada type")); 15511 SET_TYPE_FIELD_VIRTUAL (type, i); 15512 break; 15513 } 15514 } 15515 } 15516 } 15517 15518 /* Return true if this member function is a constructor, false 15519 otherwise. */ 15520 15521 static int 15522 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu) 15523 { 15524 const char *fieldname; 15525 const char *type_name; 15526 int len; 15527 15528 if (die->parent == NULL) 15529 return 0; 15530 15531 if (die->parent->tag != DW_TAG_structure_type 15532 && die->parent->tag != DW_TAG_union_type 15533 && die->parent->tag != DW_TAG_class_type) 15534 return 0; 15535 15536 fieldname = dwarf2_name (die, cu); 15537 type_name = dwarf2_name (die->parent, cu); 15538 if (fieldname == NULL || type_name == NULL) 15539 return 0; 15540 15541 len = strlen (fieldname); 15542 return (strncmp (fieldname, type_name, len) == 0 15543 && (type_name[len] == '\0' || type_name[len] == '<')); 15544 } 15545 15546 /* Check if the given VALUE is a recognized enum 15547 dwarf_defaulted_attribute constant according to DWARF5 spec, 15548 Table 7.24. */ 15549 15550 static bool 15551 is_valid_DW_AT_defaulted (ULONGEST value) 15552 { 15553 switch (value) 15554 { 15555 case DW_DEFAULTED_no: 15556 case DW_DEFAULTED_in_class: 15557 case DW_DEFAULTED_out_of_class: 15558 return true; 15559 } 15560 15561 complaint (_("unrecognized DW_AT_defaulted value (%s)"), pulongest (value)); 15562 return false; 15563 } 15564 15565 /* Add a member function to the proper fieldlist. */ 15566 15567 static void 15568 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die, 15569 struct type *type, struct dwarf2_cu *cu) 15570 { 15571 struct objfile *objfile = cu->per_objfile->objfile; 15572 struct attribute *attr; 15573 int i; 15574 struct fnfieldlist *flp = nullptr; 15575 struct fn_field *fnp; 15576 const char *fieldname; 15577 struct type *this_type; 15578 enum dwarf_access_attribute accessibility; 15579 15580 if (cu->language == language_ada) 15581 error (_("unexpected member function in Ada type")); 15582 15583 /* Get name of member function. */ 15584 fieldname = dwarf2_name (die, cu); 15585 if (fieldname == NULL) 15586 return; 15587 15588 /* Look up member function name in fieldlist. */ 15589 for (i = 0; i < fip->fnfieldlists.size (); i++) 15590 { 15591 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0) 15592 { 15593 flp = &fip->fnfieldlists[i]; 15594 break; 15595 } 15596 } 15597 15598 /* Create a new fnfieldlist if necessary. */ 15599 if (flp == nullptr) 15600 { 15601 fip->fnfieldlists.emplace_back (); 15602 flp = &fip->fnfieldlists.back (); 15603 flp->name = fieldname; 15604 i = fip->fnfieldlists.size () - 1; 15605 } 15606 15607 /* Create a new member function field and add it to the vector of 15608 fnfieldlists. */ 15609 flp->fnfields.emplace_back (); 15610 fnp = &flp->fnfields.back (); 15611 15612 /* Delay processing of the physname until later. */ 15613 if (cu->language == language_cplus) 15614 add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname, 15615 die, cu); 15616 else 15617 { 15618 const char *physname = dwarf2_physname (fieldname, die, cu); 15619 fnp->physname = physname ? physname : ""; 15620 } 15621 15622 fnp->type = alloc_type (objfile); 15623 this_type = read_type_die (die, cu); 15624 if (this_type && this_type->code () == TYPE_CODE_FUNC) 15625 { 15626 int nparams = this_type->num_fields (); 15627 15628 /* TYPE is the domain of this method, and THIS_TYPE is the type 15629 of the method itself (TYPE_CODE_METHOD). */ 15630 smash_to_method_type (fnp->type, type, 15631 TYPE_TARGET_TYPE (this_type), 15632 this_type->fields (), 15633 this_type->num_fields (), 15634 TYPE_VARARGS (this_type)); 15635 15636 /* Handle static member functions. 15637 Dwarf2 has no clean way to discern C++ static and non-static 15638 member functions. G++ helps GDB by marking the first 15639 parameter for non-static member functions (which is the this 15640 pointer) as artificial. We obtain this information from 15641 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */ 15642 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0) 15643 fnp->voffset = VOFFSET_STATIC; 15644 } 15645 else 15646 complaint (_("member function type missing for '%s'"), 15647 dwarf2_full_name (fieldname, die, cu)); 15648 15649 /* Get fcontext from DW_AT_containing_type if present. */ 15650 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) 15651 fnp->fcontext = die_containing_type (die, cu); 15652 15653 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and 15654 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */ 15655 15656 /* Get accessibility. */ 15657 attr = dwarf2_attr (die, DW_AT_accessibility, cu); 15658 if (attr != nullptr) 15659 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr); 15660 else 15661 accessibility = dwarf2_default_access_attribute (die, cu); 15662 switch (accessibility) 15663 { 15664 case DW_ACCESS_private: 15665 fnp->is_private = 1; 15666 break; 15667 case DW_ACCESS_protected: 15668 fnp->is_protected = 1; 15669 break; 15670 } 15671 15672 /* Check for artificial methods. */ 15673 attr = dwarf2_attr (die, DW_AT_artificial, cu); 15674 if (attr && DW_UNSND (attr) != 0) 15675 fnp->is_artificial = 1; 15676 15677 /* Check for defaulted methods. */ 15678 attr = dwarf2_attr (die, DW_AT_defaulted, cu); 15679 if (attr != nullptr && is_valid_DW_AT_defaulted (DW_UNSND (attr))) 15680 fnp->defaulted = (enum dwarf_defaulted_attribute) DW_UNSND (attr); 15681 15682 /* Check for deleted methods. */ 15683 attr = dwarf2_attr (die, DW_AT_deleted, cu); 15684 if (attr != nullptr && DW_UNSND (attr) != 0) 15685 fnp->is_deleted = 1; 15686 15687 fnp->is_constructor = dwarf2_is_constructor (die, cu); 15688 15689 /* Get index in virtual function table if it is a virtual member 15690 function. For older versions of GCC, this is an offset in the 15691 appropriate virtual table, as specified by DW_AT_containing_type. 15692 For everyone else, it is an expression to be evaluated relative 15693 to the object address. */ 15694 15695 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu); 15696 if (attr != nullptr) 15697 { 15698 if (attr->form_is_block () && DW_BLOCK (attr)->size > 0) 15699 { 15700 if (DW_BLOCK (attr)->data[0] == DW_OP_constu) 15701 { 15702 /* Old-style GCC. */ 15703 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2; 15704 } 15705 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref 15706 || (DW_BLOCK (attr)->size > 1 15707 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size 15708 && DW_BLOCK (attr)->data[1] == cu->header.addr_size)) 15709 { 15710 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu); 15711 if ((fnp->voffset % cu->header.addr_size) != 0) 15712 dwarf2_complex_location_expr_complaint (); 15713 else 15714 fnp->voffset /= cu->header.addr_size; 15715 fnp->voffset += 2; 15716 } 15717 else 15718 dwarf2_complex_location_expr_complaint (); 15719 15720 if (!fnp->fcontext) 15721 { 15722 /* If there is no `this' field and no DW_AT_containing_type, 15723 we cannot actually find a base class context for the 15724 vtable! */ 15725 if (this_type->num_fields () == 0 15726 || !TYPE_FIELD_ARTIFICIAL (this_type, 0)) 15727 { 15728 complaint (_("cannot determine context for virtual member " 15729 "function \"%s\" (offset %s)"), 15730 fieldname, sect_offset_str (die->sect_off)); 15731 } 15732 else 15733 { 15734 fnp->fcontext 15735 = TYPE_TARGET_TYPE (this_type->field (0).type ()); 15736 } 15737 } 15738 } 15739 else if (attr->form_is_section_offset ()) 15740 { 15741 dwarf2_complex_location_expr_complaint (); 15742 } 15743 else 15744 { 15745 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location", 15746 fieldname); 15747 } 15748 } 15749 else 15750 { 15751 attr = dwarf2_attr (die, DW_AT_virtuality, cu); 15752 if (attr && DW_UNSND (attr)) 15753 { 15754 /* GCC does this, as of 2008-08-25; PR debug/37237. */ 15755 complaint (_("Member function \"%s\" (offset %s) is virtual " 15756 "but the vtable offset is not specified"), 15757 fieldname, sect_offset_str (die->sect_off)); 15758 ALLOCATE_CPLUS_STRUCT_TYPE (type); 15759 TYPE_CPLUS_DYNAMIC (type) = 1; 15760 } 15761 } 15762 } 15763 15764 /* Create the vector of member function fields, and attach it to the type. */ 15765 15766 static void 15767 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type, 15768 struct dwarf2_cu *cu) 15769 { 15770 if (cu->language == language_ada) 15771 error (_("unexpected member functions in Ada type")); 15772 15773 ALLOCATE_CPLUS_STRUCT_TYPE (type); 15774 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *) 15775 TYPE_ALLOC (type, 15776 sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ()); 15777 15778 for (int i = 0; i < fip->fnfieldlists.size (); i++) 15779 { 15780 struct fnfieldlist &nf = fip->fnfieldlists[i]; 15781 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i); 15782 15783 TYPE_FN_FIELDLIST_NAME (type, i) = nf.name; 15784 TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size (); 15785 fn_flp->fn_fields = (struct fn_field *) 15786 TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ()); 15787 15788 for (int k = 0; k < nf.fnfields.size (); ++k) 15789 fn_flp->fn_fields[k] = nf.fnfields[k]; 15790 } 15791 15792 TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size (); 15793 } 15794 15795 /* Returns non-zero if NAME is the name of a vtable member in CU's 15796 language, zero otherwise. */ 15797 static int 15798 is_vtable_name (const char *name, struct dwarf2_cu *cu) 15799 { 15800 static const char vptr[] = "_vptr"; 15801 15802 /* Look for the C++ form of the vtable. */ 15803 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1])) 15804 return 1; 15805 15806 return 0; 15807 } 15808 15809 /* GCC outputs unnamed structures that are really pointers to member 15810 functions, with the ABI-specified layout. If TYPE describes 15811 such a structure, smash it into a member function type. 15812 15813 GCC shouldn't do this; it should just output pointer to member DIEs. 15814 This is GCC PR debug/28767. */ 15815 15816 static void 15817 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile) 15818 { 15819 struct type *pfn_type, *self_type, *new_type; 15820 15821 /* Check for a structure with no name and two children. */ 15822 if (type->code () != TYPE_CODE_STRUCT || type->num_fields () != 2) 15823 return; 15824 15825 /* Check for __pfn and __delta members. */ 15826 if (TYPE_FIELD_NAME (type, 0) == NULL 15827 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0 15828 || TYPE_FIELD_NAME (type, 1) == NULL 15829 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0) 15830 return; 15831 15832 /* Find the type of the method. */ 15833 pfn_type = type->field (0).type (); 15834 if (pfn_type == NULL 15835 || pfn_type->code () != TYPE_CODE_PTR 15836 || TYPE_TARGET_TYPE (pfn_type)->code () != TYPE_CODE_FUNC) 15837 return; 15838 15839 /* Look for the "this" argument. */ 15840 pfn_type = TYPE_TARGET_TYPE (pfn_type); 15841 if (pfn_type->num_fields () == 0 15842 /* || pfn_type->field (0).type () == NULL */ 15843 || pfn_type->field (0).type ()->code () != TYPE_CODE_PTR) 15844 return; 15845 15846 self_type = TYPE_TARGET_TYPE (pfn_type->field (0).type ()); 15847 new_type = alloc_type (objfile); 15848 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type), 15849 pfn_type->fields (), pfn_type->num_fields (), 15850 TYPE_VARARGS (pfn_type)); 15851 smash_to_methodptr_type (type, new_type); 15852 } 15853 15854 /* If the DIE has a DW_AT_alignment attribute, return its value, doing 15855 appropriate error checking and issuing complaints if there is a 15856 problem. */ 15857 15858 static ULONGEST 15859 get_alignment (struct dwarf2_cu *cu, struct die_info *die) 15860 { 15861 struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu); 15862 15863 if (attr == nullptr) 15864 return 0; 15865 15866 if (!attr->form_is_constant ()) 15867 { 15868 complaint (_("DW_AT_alignment must have constant form" 15869 " - DIE at %s [in module %s]"), 15870 sect_offset_str (die->sect_off), 15871 objfile_name (cu->per_objfile->objfile)); 15872 return 0; 15873 } 15874 15875 ULONGEST align; 15876 if (attr->form == DW_FORM_sdata) 15877 { 15878 LONGEST val = DW_SND (attr); 15879 if (val < 0) 15880 { 15881 complaint (_("DW_AT_alignment value must not be negative" 15882 " - DIE at %s [in module %s]"), 15883 sect_offset_str (die->sect_off), 15884 objfile_name (cu->per_objfile->objfile)); 15885 return 0; 15886 } 15887 align = val; 15888 } 15889 else 15890 align = DW_UNSND (attr); 15891 15892 if (align == 0) 15893 { 15894 complaint (_("DW_AT_alignment value must not be zero" 15895 " - DIE at %s [in module %s]"), 15896 sect_offset_str (die->sect_off), 15897 objfile_name (cu->per_objfile->objfile)); 15898 return 0; 15899 } 15900 if ((align & (align - 1)) != 0) 15901 { 15902 complaint (_("DW_AT_alignment value must be a power of 2" 15903 " - DIE at %s [in module %s]"), 15904 sect_offset_str (die->sect_off), 15905 objfile_name (cu->per_objfile->objfile)); 15906 return 0; 15907 } 15908 15909 return align; 15910 } 15911 15912 /* If the DIE has a DW_AT_alignment attribute, use its value to set 15913 the alignment for TYPE. */ 15914 15915 static void 15916 maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die, 15917 struct type *type) 15918 { 15919 if (!set_type_align (type, get_alignment (cu, die))) 15920 complaint (_("DW_AT_alignment value too large" 15921 " - DIE at %s [in module %s]"), 15922 sect_offset_str (die->sect_off), 15923 objfile_name (cu->per_objfile->objfile)); 15924 } 15925 15926 /* Check if the given VALUE is a valid enum dwarf_calling_convention 15927 constant for a type, according to DWARF5 spec, Table 5.5. */ 15928 15929 static bool 15930 is_valid_DW_AT_calling_convention_for_type (ULONGEST value) 15931 { 15932 switch (value) 15933 { 15934 case DW_CC_normal: 15935 case DW_CC_pass_by_reference: 15936 case DW_CC_pass_by_value: 15937 return true; 15938 15939 default: 15940 complaint (_("unrecognized DW_AT_calling_convention value " 15941 "(%s) for a type"), pulongest (value)); 15942 return false; 15943 } 15944 } 15945 15946 /* Check if the given VALUE is a valid enum dwarf_calling_convention 15947 constant for a subroutine, according to DWARF5 spec, Table 3.3, and 15948 also according to GNU-specific values (see include/dwarf2.h). */ 15949 15950 static bool 15951 is_valid_DW_AT_calling_convention_for_subroutine (ULONGEST value) 15952 { 15953 switch (value) 15954 { 15955 case DW_CC_normal: 15956 case DW_CC_program: 15957 case DW_CC_nocall: 15958 return true; 15959 15960 case DW_CC_GNU_renesas_sh: 15961 case DW_CC_GNU_borland_fastcall_i386: 15962 case DW_CC_GDB_IBM_OpenCL: 15963 return true; 15964 15965 default: 15966 complaint (_("unrecognized DW_AT_calling_convention value " 15967 "(%s) for a subroutine"), pulongest (value)); 15968 return false; 15969 } 15970 } 15971 15972 /* Called when we find the DIE that starts a structure or union scope 15973 (definition) to create a type for the structure or union. Fill in 15974 the type's name and general properties; the members will not be 15975 processed until process_structure_scope. A symbol table entry for 15976 the type will also not be done until process_structure_scope (assuming 15977 the type has a name). 15978 15979 NOTE: we need to call these functions regardless of whether or not the 15980 DIE has a DW_AT_name attribute, since it might be an anonymous 15981 structure or union. This gets the type entered into our set of 15982 user defined types. */ 15983 15984 static struct type * 15985 read_structure_type (struct die_info *die, struct dwarf2_cu *cu) 15986 { 15987 struct objfile *objfile = cu->per_objfile->objfile; 15988 struct type *type; 15989 struct attribute *attr; 15990 const char *name; 15991 15992 /* If the definition of this type lives in .debug_types, read that type. 15993 Don't follow DW_AT_specification though, that will take us back up 15994 the chain and we want to go down. */ 15995 attr = die->attr (DW_AT_signature); 15996 if (attr != nullptr) 15997 { 15998 type = get_DW_AT_signature_type (die, attr, cu); 15999 16000 /* The type's CU may not be the same as CU. 16001 Ensure TYPE is recorded with CU in die_type_hash. */ 16002 return set_die_type (die, type, cu); 16003 } 16004 16005 type = alloc_type (objfile); 16006 INIT_CPLUS_SPECIFIC (type); 16007 16008 name = dwarf2_name (die, cu); 16009 if (name != NULL) 16010 { 16011 if (cu->language == language_cplus 16012 || cu->language == language_d 16013 || cu->language == language_rust) 16014 { 16015 const char *full_name = dwarf2_full_name (name, die, cu); 16016 16017 /* dwarf2_full_name might have already finished building the DIE's 16018 type. If so, there is no need to continue. */ 16019 if (get_die_type (die, cu) != NULL) 16020 return get_die_type (die, cu); 16021 16022 type->set_name (full_name); 16023 } 16024 else 16025 { 16026 /* The name is already allocated along with this objfile, so 16027 we don't need to duplicate it for the type. */ 16028 type->set_name (name); 16029 } 16030 } 16031 16032 if (die->tag == DW_TAG_structure_type) 16033 { 16034 type->set_code (TYPE_CODE_STRUCT); 16035 } 16036 else if (die->tag == DW_TAG_union_type) 16037 { 16038 type->set_code (TYPE_CODE_UNION); 16039 } 16040 else 16041 { 16042 type->set_code (TYPE_CODE_STRUCT); 16043 } 16044 16045 if (cu->language == language_cplus && die->tag == DW_TAG_class_type) 16046 TYPE_DECLARED_CLASS (type) = 1; 16047 16048 /* Store the calling convention in the type if it's available in 16049 the die. Otherwise the calling convention remains set to 16050 the default value DW_CC_normal. */ 16051 attr = dwarf2_attr (die, DW_AT_calling_convention, cu); 16052 if (attr != nullptr 16053 && is_valid_DW_AT_calling_convention_for_type (DW_UNSND (attr))) 16054 { 16055 ALLOCATE_CPLUS_STRUCT_TYPE (type); 16056 TYPE_CPLUS_CALLING_CONVENTION (type) 16057 = (enum dwarf_calling_convention) (DW_UNSND (attr)); 16058 } 16059 16060 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 16061 if (attr != nullptr) 16062 { 16063 if (attr->form_is_constant ()) 16064 TYPE_LENGTH (type) = DW_UNSND (attr); 16065 else 16066 { 16067 struct dynamic_prop prop; 16068 if (attr_to_dynamic_prop (attr, die, cu, &prop, cu->addr_type ())) 16069 type->add_dyn_prop (DYN_PROP_BYTE_SIZE, prop); 16070 TYPE_LENGTH (type) = 0; 16071 } 16072 } 16073 else 16074 { 16075 TYPE_LENGTH (type) = 0; 16076 } 16077 16078 maybe_set_alignment (cu, die, type); 16079 16080 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0)) 16081 { 16082 /* ICC<14 does not output the required DW_AT_declaration on 16083 incomplete types, but gives them a size of zero. */ 16084 TYPE_STUB (type) = 1; 16085 } 16086 else 16087 TYPE_STUB_SUPPORTED (type) = 1; 16088 16089 if (die_is_declaration (die, cu)) 16090 TYPE_STUB (type) = 1; 16091 else if (attr == NULL && die->child == NULL 16092 && producer_is_realview (cu->producer)) 16093 /* RealView does not output the required DW_AT_declaration 16094 on incomplete types. */ 16095 TYPE_STUB (type) = 1; 16096 16097 /* We need to add the type field to the die immediately so we don't 16098 infinitely recurse when dealing with pointers to the structure 16099 type within the structure itself. */ 16100 set_die_type (die, type, cu); 16101 16102 /* set_die_type should be already done. */ 16103 set_descriptive_type (type, die, cu); 16104 16105 return type; 16106 } 16107 16108 static void handle_struct_member_die 16109 (struct die_info *child_die, 16110 struct type *type, 16111 struct field_info *fi, 16112 std::vector<struct symbol *> *template_args, 16113 struct dwarf2_cu *cu); 16114 16115 /* A helper for handle_struct_member_die that handles 16116 DW_TAG_variant_part. */ 16117 16118 static void 16119 handle_variant_part (struct die_info *die, struct type *type, 16120 struct field_info *fi, 16121 std::vector<struct symbol *> *template_args, 16122 struct dwarf2_cu *cu) 16123 { 16124 variant_part_builder *new_part; 16125 if (fi->current_variant_part == nullptr) 16126 { 16127 fi->variant_parts.emplace_back (); 16128 new_part = &fi->variant_parts.back (); 16129 } 16130 else if (!fi->current_variant_part->processing_variant) 16131 { 16132 complaint (_("nested DW_TAG_variant_part seen " 16133 "- DIE at %s [in module %s]"), 16134 sect_offset_str (die->sect_off), 16135 objfile_name (cu->per_objfile->objfile)); 16136 return; 16137 } 16138 else 16139 { 16140 variant_field ¤t = fi->current_variant_part->variants.back (); 16141 current.variant_parts.emplace_back (); 16142 new_part = ¤t.variant_parts.back (); 16143 } 16144 16145 /* When we recurse, we want callees to add to this new variant 16146 part. */ 16147 scoped_restore save_current_variant_part 16148 = make_scoped_restore (&fi->current_variant_part, new_part); 16149 16150 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu); 16151 if (discr == NULL) 16152 { 16153 /* It's a univariant form, an extension we support. */ 16154 } 16155 else if (discr->form_is_ref ()) 16156 { 16157 struct dwarf2_cu *target_cu = cu; 16158 struct die_info *target_die = follow_die_ref (die, discr, &target_cu); 16159 16160 new_part->discriminant_offset = target_die->sect_off; 16161 } 16162 else 16163 { 16164 complaint (_("DW_AT_discr does not have DIE reference form" 16165 " - DIE at %s [in module %s]"), 16166 sect_offset_str (die->sect_off), 16167 objfile_name (cu->per_objfile->objfile)); 16168 } 16169 16170 for (die_info *child_die = die->child; 16171 child_die != NULL; 16172 child_die = child_die->sibling) 16173 handle_struct_member_die (child_die, type, fi, template_args, cu); 16174 } 16175 16176 /* A helper for handle_struct_member_die that handles 16177 DW_TAG_variant. */ 16178 16179 static void 16180 handle_variant (struct die_info *die, struct type *type, 16181 struct field_info *fi, 16182 std::vector<struct symbol *> *template_args, 16183 struct dwarf2_cu *cu) 16184 { 16185 if (fi->current_variant_part == nullptr) 16186 { 16187 complaint (_("saw DW_TAG_variant outside DW_TAG_variant_part " 16188 "- DIE at %s [in module %s]"), 16189 sect_offset_str (die->sect_off), 16190 objfile_name (cu->per_objfile->objfile)); 16191 return; 16192 } 16193 if (fi->current_variant_part->processing_variant) 16194 { 16195 complaint (_("nested DW_TAG_variant seen " 16196 "- DIE at %s [in module %s]"), 16197 sect_offset_str (die->sect_off), 16198 objfile_name (cu->per_objfile->objfile)); 16199 return; 16200 } 16201 16202 scoped_restore save_processing_variant 16203 = make_scoped_restore (&fi->current_variant_part->processing_variant, 16204 true); 16205 16206 fi->current_variant_part->variants.emplace_back (); 16207 variant_field &variant = fi->current_variant_part->variants.back (); 16208 variant.first_field = fi->fields.size (); 16209 16210 /* In a variant we want to get the discriminant and also add a 16211 field for our sole member child. */ 16212 struct attribute *discr = dwarf2_attr (die, DW_AT_discr_value, cu); 16213 if (discr == nullptr) 16214 { 16215 discr = dwarf2_attr (die, DW_AT_discr_list, cu); 16216 if (discr == nullptr || DW_BLOCK (discr)->size == 0) 16217 variant.default_branch = true; 16218 else 16219 variant.discr_list_data = DW_BLOCK (discr); 16220 } 16221 else 16222 variant.discriminant_value = DW_UNSND (discr); 16223 16224 for (die_info *variant_child = die->child; 16225 variant_child != NULL; 16226 variant_child = variant_child->sibling) 16227 handle_struct_member_die (variant_child, type, fi, template_args, cu); 16228 16229 variant.last_field = fi->fields.size (); 16230 } 16231 16232 /* A helper for process_structure_scope that handles a single member 16233 DIE. */ 16234 16235 static void 16236 handle_struct_member_die (struct die_info *child_die, struct type *type, 16237 struct field_info *fi, 16238 std::vector<struct symbol *> *template_args, 16239 struct dwarf2_cu *cu) 16240 { 16241 if (child_die->tag == DW_TAG_member 16242 || child_die->tag == DW_TAG_variable) 16243 { 16244 /* NOTE: carlton/2002-11-05: A C++ static data member 16245 should be a DW_TAG_member that is a declaration, but 16246 all versions of G++ as of this writing (so through at 16247 least 3.2.1) incorrectly generate DW_TAG_variable 16248 tags for them instead. */ 16249 dwarf2_add_field (fi, child_die, cu); 16250 } 16251 else if (child_die->tag == DW_TAG_subprogram) 16252 { 16253 /* Rust doesn't have member functions in the C++ sense. 16254 However, it does emit ordinary functions as children 16255 of a struct DIE. */ 16256 if (cu->language == language_rust) 16257 read_func_scope (child_die, cu); 16258 else 16259 { 16260 /* C++ member function. */ 16261 dwarf2_add_member_fn (fi, child_die, type, cu); 16262 } 16263 } 16264 else if (child_die->tag == DW_TAG_inheritance) 16265 { 16266 /* C++ base class field. */ 16267 dwarf2_add_field (fi, child_die, cu); 16268 } 16269 else if (type_can_define_types (child_die)) 16270 dwarf2_add_type_defn (fi, child_die, cu); 16271 else if (child_die->tag == DW_TAG_template_type_param 16272 || child_die->tag == DW_TAG_template_value_param) 16273 { 16274 struct symbol *arg = new_symbol (child_die, NULL, cu); 16275 16276 if (arg != NULL) 16277 template_args->push_back (arg); 16278 } 16279 else if (child_die->tag == DW_TAG_variant_part) 16280 handle_variant_part (child_die, type, fi, template_args, cu); 16281 else if (child_die->tag == DW_TAG_variant) 16282 handle_variant (child_die, type, fi, template_args, cu); 16283 } 16284 16285 /* Finish creating a structure or union type, including filling in 16286 its members and creating a symbol for it. */ 16287 16288 static void 16289 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu) 16290 { 16291 struct objfile *objfile = cu->per_objfile->objfile; 16292 struct die_info *child_die; 16293 struct type *type; 16294 16295 type = get_die_type (die, cu); 16296 if (type == NULL) 16297 type = read_structure_type (die, cu); 16298 16299 bool has_template_parameters = false; 16300 if (die->child != NULL && ! die_is_declaration (die, cu)) 16301 { 16302 struct field_info fi; 16303 std::vector<struct symbol *> template_args; 16304 16305 child_die = die->child; 16306 16307 while (child_die && child_die->tag) 16308 { 16309 handle_struct_member_die (child_die, type, &fi, &template_args, cu); 16310 child_die = child_die->sibling; 16311 } 16312 16313 /* Attach template arguments to type. */ 16314 if (!template_args.empty ()) 16315 { 16316 has_template_parameters = true; 16317 ALLOCATE_CPLUS_STRUCT_TYPE (type); 16318 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size (); 16319 TYPE_TEMPLATE_ARGUMENTS (type) 16320 = XOBNEWVEC (&objfile->objfile_obstack, 16321 struct symbol *, 16322 TYPE_N_TEMPLATE_ARGUMENTS (type)); 16323 memcpy (TYPE_TEMPLATE_ARGUMENTS (type), 16324 template_args.data (), 16325 (TYPE_N_TEMPLATE_ARGUMENTS (type) 16326 * sizeof (struct symbol *))); 16327 } 16328 16329 /* Attach fields and member functions to the type. */ 16330 if (fi.nfields () > 0) 16331 dwarf2_attach_fields_to_type (&fi, type, cu); 16332 if (!fi.fnfieldlists.empty ()) 16333 { 16334 dwarf2_attach_fn_fields_to_type (&fi, type, cu); 16335 16336 /* Get the type which refers to the base class (possibly this 16337 class itself) which contains the vtable pointer for the current 16338 class from the DW_AT_containing_type attribute. This use of 16339 DW_AT_containing_type is a GNU extension. */ 16340 16341 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) 16342 { 16343 struct type *t = die_containing_type (die, cu); 16344 16345 set_type_vptr_basetype (type, t); 16346 if (type == t) 16347 { 16348 int i; 16349 16350 /* Our own class provides vtbl ptr. */ 16351 for (i = t->num_fields () - 1; 16352 i >= TYPE_N_BASECLASSES (t); 16353 --i) 16354 { 16355 const char *fieldname = TYPE_FIELD_NAME (t, i); 16356 16357 if (is_vtable_name (fieldname, cu)) 16358 { 16359 set_type_vptr_fieldno (type, i); 16360 break; 16361 } 16362 } 16363 16364 /* Complain if virtual function table field not found. */ 16365 if (i < TYPE_N_BASECLASSES (t)) 16366 complaint (_("virtual function table pointer " 16367 "not found when defining class '%s'"), 16368 type->name () ? type->name () : ""); 16369 } 16370 else 16371 { 16372 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t)); 16373 } 16374 } 16375 else if (cu->producer 16376 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition")) 16377 { 16378 /* The IBM XLC compiler does not provide direct indication 16379 of the containing type, but the vtable pointer is 16380 always named __vfp. */ 16381 16382 int i; 16383 16384 for (i = type->num_fields () - 1; 16385 i >= TYPE_N_BASECLASSES (type); 16386 --i) 16387 { 16388 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0) 16389 { 16390 set_type_vptr_fieldno (type, i); 16391 set_type_vptr_basetype (type, type); 16392 break; 16393 } 16394 } 16395 } 16396 } 16397 16398 /* Copy fi.typedef_field_list linked list elements content into the 16399 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */ 16400 if (!fi.typedef_field_list.empty ()) 16401 { 16402 int count = fi.typedef_field_list.size (); 16403 16404 ALLOCATE_CPLUS_STRUCT_TYPE (type); 16405 TYPE_TYPEDEF_FIELD_ARRAY (type) 16406 = ((struct decl_field *) 16407 TYPE_ALLOC (type, 16408 sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count)); 16409 TYPE_TYPEDEF_FIELD_COUNT (type) = count; 16410 16411 for (int i = 0; i < fi.typedef_field_list.size (); ++i) 16412 TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i]; 16413 } 16414 16415 /* Copy fi.nested_types_list linked list elements content into the 16416 allocated array TYPE_NESTED_TYPES_ARRAY (type). */ 16417 if (!fi.nested_types_list.empty () && cu->language != language_ada) 16418 { 16419 int count = fi.nested_types_list.size (); 16420 16421 ALLOCATE_CPLUS_STRUCT_TYPE (type); 16422 TYPE_NESTED_TYPES_ARRAY (type) 16423 = ((struct decl_field *) 16424 TYPE_ALLOC (type, sizeof (struct decl_field) * count)); 16425 TYPE_NESTED_TYPES_COUNT (type) = count; 16426 16427 for (int i = 0; i < fi.nested_types_list.size (); ++i) 16428 TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i]; 16429 } 16430 } 16431 16432 quirk_gcc_member_function_pointer (type, objfile); 16433 if (cu->language == language_rust && die->tag == DW_TAG_union_type) 16434 cu->rust_unions.push_back (type); 16435 16436 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its 16437 snapshots) has been known to create a die giving a declaration 16438 for a class that has, as a child, a die giving a definition for a 16439 nested class. So we have to process our children even if the 16440 current die is a declaration. Normally, of course, a declaration 16441 won't have any children at all. */ 16442 16443 child_die = die->child; 16444 16445 while (child_die != NULL && child_die->tag) 16446 { 16447 if (child_die->tag == DW_TAG_member 16448 || child_die->tag == DW_TAG_variable 16449 || child_die->tag == DW_TAG_inheritance 16450 || child_die->tag == DW_TAG_template_value_param 16451 || child_die->tag == DW_TAG_template_type_param) 16452 { 16453 /* Do nothing. */ 16454 } 16455 else 16456 process_die (child_die, cu); 16457 16458 child_die = child_die->sibling; 16459 } 16460 16461 /* Do not consider external references. According to the DWARF standard, 16462 these DIEs are identified by the fact that they have no byte_size 16463 attribute, and a declaration attribute. */ 16464 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL 16465 || !die_is_declaration (die, cu) 16466 || dwarf2_attr (die, DW_AT_signature, cu) != NULL) 16467 { 16468 struct symbol *sym = new_symbol (die, type, cu); 16469 16470 if (has_template_parameters) 16471 { 16472 struct symtab *symtab; 16473 if (sym != nullptr) 16474 symtab = symbol_symtab (sym); 16475 else if (cu->line_header != nullptr) 16476 { 16477 /* Any related symtab will do. */ 16478 symtab 16479 = cu->line_header->file_names ()[0].symtab; 16480 } 16481 else 16482 { 16483 symtab = nullptr; 16484 complaint (_("could not find suitable " 16485 "symtab for template parameter" 16486 " - DIE at %s [in module %s]"), 16487 sect_offset_str (die->sect_off), 16488 objfile_name (objfile)); 16489 } 16490 16491 if (symtab != nullptr) 16492 { 16493 /* Make sure that the symtab is set on the new symbols. 16494 Even though they don't appear in this symtab directly, 16495 other parts of gdb assume that symbols do, and this is 16496 reasonably true. */ 16497 for (int i = 0; i < TYPE_N_TEMPLATE_ARGUMENTS (type); ++i) 16498 symbol_set_symtab (TYPE_TEMPLATE_ARGUMENT (type, i), symtab); 16499 } 16500 } 16501 } 16502 } 16503 16504 /* Assuming DIE is an enumeration type, and TYPE is its associated 16505 type, update TYPE using some information only available in DIE's 16506 children. In particular, the fields are computed. */ 16507 16508 static void 16509 update_enumeration_type_from_children (struct die_info *die, 16510 struct type *type, 16511 struct dwarf2_cu *cu) 16512 { 16513 struct die_info *child_die; 16514 int unsigned_enum = 1; 16515 int flag_enum = 1; 16516 16517 auto_obstack obstack; 16518 std::vector<struct field> fields; 16519 16520 for (child_die = die->child; 16521 child_die != NULL && child_die->tag; 16522 child_die = child_die->sibling) 16523 { 16524 struct attribute *attr; 16525 LONGEST value; 16526 const gdb_byte *bytes; 16527 struct dwarf2_locexpr_baton *baton; 16528 const char *name; 16529 16530 if (child_die->tag != DW_TAG_enumerator) 16531 continue; 16532 16533 attr = dwarf2_attr (child_die, DW_AT_const_value, cu); 16534 if (attr == NULL) 16535 continue; 16536 16537 name = dwarf2_name (child_die, cu); 16538 if (name == NULL) 16539 name = "<anonymous enumerator>"; 16540 16541 dwarf2_const_value_attr (attr, type, name, &obstack, cu, 16542 &value, &bytes, &baton); 16543 if (value < 0) 16544 { 16545 unsigned_enum = 0; 16546 flag_enum = 0; 16547 } 16548 else 16549 { 16550 if (count_one_bits_ll (value) >= 2) 16551 flag_enum = 0; 16552 } 16553 16554 fields.emplace_back (); 16555 struct field &field = fields.back (); 16556 FIELD_NAME (field) = dwarf2_physname (name, child_die, cu); 16557 SET_FIELD_ENUMVAL (field, value); 16558 } 16559 16560 if (!fields.empty ()) 16561 { 16562 type->set_num_fields (fields.size ()); 16563 type->set_fields 16564 ((struct field *) 16565 TYPE_ALLOC (type, sizeof (struct field) * fields.size ())); 16566 memcpy (type->fields (), fields.data (), 16567 sizeof (struct field) * fields.size ()); 16568 } 16569 16570 if (unsigned_enum) 16571 TYPE_UNSIGNED (type) = 1; 16572 if (flag_enum) 16573 TYPE_FLAG_ENUM (type) = 1; 16574 } 16575 16576 /* Given a DW_AT_enumeration_type die, set its type. We do not 16577 complete the type's fields yet, or create any symbols. */ 16578 16579 static struct type * 16580 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu) 16581 { 16582 struct objfile *objfile = cu->per_objfile->objfile; 16583 struct type *type; 16584 struct attribute *attr; 16585 const char *name; 16586 16587 /* If the definition of this type lives in .debug_types, read that type. 16588 Don't follow DW_AT_specification though, that will take us back up 16589 the chain and we want to go down. */ 16590 attr = die->attr (DW_AT_signature); 16591 if (attr != nullptr) 16592 { 16593 type = get_DW_AT_signature_type (die, attr, cu); 16594 16595 /* The type's CU may not be the same as CU. 16596 Ensure TYPE is recorded with CU in die_type_hash. */ 16597 return set_die_type (die, type, cu); 16598 } 16599 16600 type = alloc_type (objfile); 16601 16602 type->set_code (TYPE_CODE_ENUM); 16603 name = dwarf2_full_name (NULL, die, cu); 16604 if (name != NULL) 16605 type->set_name (name); 16606 16607 attr = dwarf2_attr (die, DW_AT_type, cu); 16608 if (attr != NULL) 16609 { 16610 struct type *underlying_type = die_type (die, cu); 16611 16612 TYPE_TARGET_TYPE (type) = underlying_type; 16613 } 16614 16615 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 16616 if (attr != nullptr) 16617 { 16618 TYPE_LENGTH (type) = DW_UNSND (attr); 16619 } 16620 else 16621 { 16622 TYPE_LENGTH (type) = 0; 16623 } 16624 16625 maybe_set_alignment (cu, die, type); 16626 16627 /* The enumeration DIE can be incomplete. In Ada, any type can be 16628 declared as private in the package spec, and then defined only 16629 inside the package body. Such types are known as Taft Amendment 16630 Types. When another package uses such a type, an incomplete DIE 16631 may be generated by the compiler. */ 16632 if (die_is_declaration (die, cu)) 16633 TYPE_STUB (type) = 1; 16634 16635 /* If this type has an underlying type that is not a stub, then we 16636 may use its attributes. We always use the "unsigned" attribute 16637 in this situation, because ordinarily we guess whether the type 16638 is unsigned -- but the guess can be wrong and the underlying type 16639 can tell us the reality. However, we defer to a local size 16640 attribute if one exists, because this lets the compiler override 16641 the underlying type if needed. */ 16642 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type))) 16643 { 16644 struct type *underlying_type = TYPE_TARGET_TYPE (type); 16645 underlying_type = check_typedef (underlying_type); 16646 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (underlying_type); 16647 if (TYPE_LENGTH (type) == 0) 16648 TYPE_LENGTH (type) = TYPE_LENGTH (underlying_type); 16649 if (TYPE_RAW_ALIGN (type) == 0 16650 && TYPE_RAW_ALIGN (underlying_type) != 0) 16651 set_type_align (type, TYPE_RAW_ALIGN (underlying_type)); 16652 } 16653 16654 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu); 16655 16656 set_die_type (die, type, cu); 16657 16658 /* Finish the creation of this type by using the enum's children. 16659 Note that, as usual, this must come after set_die_type to avoid 16660 infinite recursion when trying to compute the names of the 16661 enumerators. */ 16662 update_enumeration_type_from_children (die, type, cu); 16663 16664 return type; 16665 } 16666 16667 /* Given a pointer to a die which begins an enumeration, process all 16668 the dies that define the members of the enumeration, and create the 16669 symbol for the enumeration type. 16670 16671 NOTE: We reverse the order of the element list. */ 16672 16673 static void 16674 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu) 16675 { 16676 struct type *this_type; 16677 16678 this_type = get_die_type (die, cu); 16679 if (this_type == NULL) 16680 this_type = read_enumeration_type (die, cu); 16681 16682 if (die->child != NULL) 16683 { 16684 struct die_info *child_die; 16685 const char *name; 16686 16687 child_die = die->child; 16688 while (child_die && child_die->tag) 16689 { 16690 if (child_die->tag != DW_TAG_enumerator) 16691 { 16692 process_die (child_die, cu); 16693 } 16694 else 16695 { 16696 name = dwarf2_name (child_die, cu); 16697 if (name) 16698 new_symbol (child_die, this_type, cu); 16699 } 16700 16701 child_die = child_die->sibling; 16702 } 16703 } 16704 16705 /* If we are reading an enum from a .debug_types unit, and the enum 16706 is a declaration, and the enum is not the signatured type in the 16707 unit, then we do not want to add a symbol for it. Adding a 16708 symbol would in some cases obscure the true definition of the 16709 enum, giving users an incomplete type when the definition is 16710 actually available. Note that we do not want to do this for all 16711 enums which are just declarations, because C++0x allows forward 16712 enum declarations. */ 16713 if (cu->per_cu->is_debug_types 16714 && die_is_declaration (die, cu)) 16715 { 16716 struct signatured_type *sig_type; 16717 16718 sig_type = (struct signatured_type *) cu->per_cu; 16719 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0); 16720 if (sig_type->type_offset_in_section != die->sect_off) 16721 return; 16722 } 16723 16724 new_symbol (die, this_type, cu); 16725 } 16726 16727 /* Extract all information from a DW_TAG_array_type DIE and put it in 16728 the DIE's type field. For now, this only handles one dimensional 16729 arrays. */ 16730 16731 static struct type * 16732 read_array_type (struct die_info *die, struct dwarf2_cu *cu) 16733 { 16734 struct objfile *objfile = cu->per_objfile->objfile; 16735 struct die_info *child_die; 16736 struct type *type; 16737 struct type *element_type, *range_type, *index_type; 16738 struct attribute *attr; 16739 const char *name; 16740 struct dynamic_prop *byte_stride_prop = NULL; 16741 unsigned int bit_stride = 0; 16742 16743 element_type = die_type (die, cu); 16744 16745 /* The die_type call above may have already set the type for this DIE. */ 16746 type = get_die_type (die, cu); 16747 if (type) 16748 return type; 16749 16750 attr = dwarf2_attr (die, DW_AT_byte_stride, cu); 16751 if (attr != NULL) 16752 { 16753 int stride_ok; 16754 struct type *prop_type = cu->addr_sized_int_type (false); 16755 16756 byte_stride_prop 16757 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop)); 16758 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop, 16759 prop_type); 16760 if (!stride_ok) 16761 { 16762 complaint (_("unable to read array DW_AT_byte_stride " 16763 " - DIE at %s [in module %s]"), 16764 sect_offset_str (die->sect_off), 16765 objfile_name (cu->per_objfile->objfile)); 16766 /* Ignore this attribute. We will likely not be able to print 16767 arrays of this type correctly, but there is little we can do 16768 to help if we cannot read the attribute's value. */ 16769 byte_stride_prop = NULL; 16770 } 16771 } 16772 16773 attr = dwarf2_attr (die, DW_AT_bit_stride, cu); 16774 if (attr != NULL) 16775 bit_stride = DW_UNSND (attr); 16776 16777 /* Irix 6.2 native cc creates array types without children for 16778 arrays with unspecified length. */ 16779 if (die->child == NULL) 16780 { 16781 index_type = objfile_type (objfile)->builtin_int; 16782 range_type = create_static_range_type (NULL, index_type, 0, -1); 16783 type = create_array_type_with_stride (NULL, element_type, range_type, 16784 byte_stride_prop, bit_stride); 16785 return set_die_type (die, type, cu); 16786 } 16787 16788 std::vector<struct type *> range_types; 16789 child_die = die->child; 16790 while (child_die && child_die->tag) 16791 { 16792 if (child_die->tag == DW_TAG_subrange_type) 16793 { 16794 struct type *child_type = read_type_die (child_die, cu); 16795 16796 if (child_type != NULL) 16797 { 16798 /* The range type was succesfully read. Save it for the 16799 array type creation. */ 16800 range_types.push_back (child_type); 16801 } 16802 } 16803 child_die = child_die->sibling; 16804 } 16805 16806 /* Dwarf2 dimensions are output from left to right, create the 16807 necessary array types in backwards order. */ 16808 16809 type = element_type; 16810 16811 if (read_array_order (die, cu) == DW_ORD_col_major) 16812 { 16813 int i = 0; 16814 16815 while (i < range_types.size ()) 16816 type = create_array_type_with_stride (NULL, type, range_types[i++], 16817 byte_stride_prop, bit_stride); 16818 } 16819 else 16820 { 16821 size_t ndim = range_types.size (); 16822 while (ndim-- > 0) 16823 type = create_array_type_with_stride (NULL, type, range_types[ndim], 16824 byte_stride_prop, bit_stride); 16825 } 16826 16827 /* Understand Dwarf2 support for vector types (like they occur on 16828 the PowerPC w/ AltiVec). Gcc just adds another attribute to the 16829 array type. This is not part of the Dwarf2/3 standard yet, but a 16830 custom vendor extension. The main difference between a regular 16831 array and the vector variant is that vectors are passed by value 16832 to functions. */ 16833 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu); 16834 if (attr != nullptr) 16835 make_vector_type (type); 16836 16837 /* The DIE may have DW_AT_byte_size set. For example an OpenCL 16838 implementation may choose to implement triple vectors using this 16839 attribute. */ 16840 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 16841 if (attr != nullptr) 16842 { 16843 if (DW_UNSND (attr) >= TYPE_LENGTH (type)) 16844 TYPE_LENGTH (type) = DW_UNSND (attr); 16845 else 16846 complaint (_("DW_AT_byte_size for array type smaller " 16847 "than the total size of elements")); 16848 } 16849 16850 name = dwarf2_name (die, cu); 16851 if (name) 16852 type->set_name (name); 16853 16854 maybe_set_alignment (cu, die, type); 16855 16856 /* Install the type in the die. */ 16857 set_die_type (die, type, cu); 16858 16859 /* set_die_type should be already done. */ 16860 set_descriptive_type (type, die, cu); 16861 16862 return type; 16863 } 16864 16865 static enum dwarf_array_dim_ordering 16866 read_array_order (struct die_info *die, struct dwarf2_cu *cu) 16867 { 16868 struct attribute *attr; 16869 16870 attr = dwarf2_attr (die, DW_AT_ordering, cu); 16871 16872 if (attr != nullptr) 16873 return (enum dwarf_array_dim_ordering) DW_SND (attr); 16874 16875 /* GNU F77 is a special case, as at 08/2004 array type info is the 16876 opposite order to the dwarf2 specification, but data is still 16877 laid out as per normal fortran. 16878 16879 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need 16880 version checking. */ 16881 16882 if (cu->language == language_fortran 16883 && cu->producer && strstr (cu->producer, "GNU F77")) 16884 { 16885 return DW_ORD_row_major; 16886 } 16887 16888 switch (cu->language_defn->la_array_ordering) 16889 { 16890 case array_column_major: 16891 return DW_ORD_col_major; 16892 case array_row_major: 16893 default: 16894 return DW_ORD_row_major; 16895 }; 16896 } 16897 16898 /* Extract all information from a DW_TAG_set_type DIE and put it in 16899 the DIE's type field. */ 16900 16901 static struct type * 16902 read_set_type (struct die_info *die, struct dwarf2_cu *cu) 16903 { 16904 struct type *domain_type, *set_type; 16905 struct attribute *attr; 16906 16907 domain_type = die_type (die, cu); 16908 16909 /* The die_type call above may have already set the type for this DIE. */ 16910 set_type = get_die_type (die, cu); 16911 if (set_type) 16912 return set_type; 16913 16914 set_type = create_set_type (NULL, domain_type); 16915 16916 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 16917 if (attr != nullptr) 16918 TYPE_LENGTH (set_type) = DW_UNSND (attr); 16919 16920 maybe_set_alignment (cu, die, set_type); 16921 16922 return set_die_type (die, set_type, cu); 16923 } 16924 16925 /* A helper for read_common_block that creates a locexpr baton. 16926 SYM is the symbol which we are marking as computed. 16927 COMMON_DIE is the DIE for the common block. 16928 COMMON_LOC is the location expression attribute for the common 16929 block itself. 16930 MEMBER_LOC is the location expression attribute for the particular 16931 member of the common block that we are processing. 16932 CU is the CU from which the above come. */ 16933 16934 static void 16935 mark_common_block_symbol_computed (struct symbol *sym, 16936 struct die_info *common_die, 16937 struct attribute *common_loc, 16938 struct attribute *member_loc, 16939 struct dwarf2_cu *cu) 16940 { 16941 dwarf2_per_objfile *per_objfile = cu->per_objfile; 16942 struct objfile *objfile = per_objfile->objfile; 16943 struct dwarf2_locexpr_baton *baton; 16944 gdb_byte *ptr; 16945 unsigned int cu_off; 16946 enum bfd_endian byte_order = gdbarch_byte_order (objfile->arch ()); 16947 LONGEST offset = 0; 16948 16949 gdb_assert (common_loc && member_loc); 16950 gdb_assert (common_loc->form_is_block ()); 16951 gdb_assert (member_loc->form_is_block () 16952 || member_loc->form_is_constant ()); 16953 16954 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton); 16955 baton->per_objfile = per_objfile; 16956 baton->per_cu = cu->per_cu; 16957 gdb_assert (baton->per_cu); 16958 16959 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */; 16960 16961 if (member_loc->form_is_constant ()) 16962 { 16963 offset = member_loc->constant_value (0); 16964 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size; 16965 } 16966 else 16967 baton->size += DW_BLOCK (member_loc)->size; 16968 16969 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size); 16970 baton->data = ptr; 16971 16972 *ptr++ = DW_OP_call4; 16973 cu_off = common_die->sect_off - cu->per_cu->sect_off; 16974 store_unsigned_integer (ptr, 4, byte_order, cu_off); 16975 ptr += 4; 16976 16977 if (member_loc->form_is_constant ()) 16978 { 16979 *ptr++ = DW_OP_addr; 16980 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset); 16981 ptr += cu->header.addr_size; 16982 } 16983 else 16984 { 16985 /* We have to copy the data here, because DW_OP_call4 will only 16986 use a DW_AT_location attribute. */ 16987 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size); 16988 ptr += DW_BLOCK (member_loc)->size; 16989 } 16990 16991 *ptr++ = DW_OP_plus; 16992 gdb_assert (ptr - baton->data == baton->size); 16993 16994 SYMBOL_LOCATION_BATON (sym) = baton; 16995 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index; 16996 } 16997 16998 /* Create appropriate locally-scoped variables for all the 16999 DW_TAG_common_block entries. Also create a struct common_block 17000 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN 17001 is used to separate the common blocks name namespace from regular 17002 variable names. */ 17003 17004 static void 17005 read_common_block (struct die_info *die, struct dwarf2_cu *cu) 17006 { 17007 struct attribute *attr; 17008 17009 attr = dwarf2_attr (die, DW_AT_location, cu); 17010 if (attr != nullptr) 17011 { 17012 /* Support the .debug_loc offsets. */ 17013 if (attr->form_is_block ()) 17014 { 17015 /* Ok. */ 17016 } 17017 else if (attr->form_is_section_offset ()) 17018 { 17019 dwarf2_complex_location_expr_complaint (); 17020 attr = NULL; 17021 } 17022 else 17023 { 17024 dwarf2_invalid_attrib_class_complaint ("DW_AT_location", 17025 "common block member"); 17026 attr = NULL; 17027 } 17028 } 17029 17030 if (die->child != NULL) 17031 { 17032 struct objfile *objfile = cu->per_objfile->objfile; 17033 struct die_info *child_die; 17034 size_t n_entries = 0, size; 17035 struct common_block *common_block; 17036 struct symbol *sym; 17037 17038 for (child_die = die->child; 17039 child_die && child_die->tag; 17040 child_die = child_die->sibling) 17041 ++n_entries; 17042 17043 size = (sizeof (struct common_block) 17044 + (n_entries - 1) * sizeof (struct symbol *)); 17045 common_block 17046 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack, 17047 size); 17048 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *)); 17049 common_block->n_entries = 0; 17050 17051 for (child_die = die->child; 17052 child_die && child_die->tag; 17053 child_die = child_die->sibling) 17054 { 17055 /* Create the symbol in the DW_TAG_common_block block in the current 17056 symbol scope. */ 17057 sym = new_symbol (child_die, NULL, cu); 17058 if (sym != NULL) 17059 { 17060 struct attribute *member_loc; 17061 17062 common_block->contents[common_block->n_entries++] = sym; 17063 17064 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location, 17065 cu); 17066 if (member_loc) 17067 { 17068 /* GDB has handled this for a long time, but it is 17069 not specified by DWARF. It seems to have been 17070 emitted by gfortran at least as recently as: 17071 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */ 17072 complaint (_("Variable in common block has " 17073 "DW_AT_data_member_location " 17074 "- DIE at %s [in module %s]"), 17075 sect_offset_str (child_die->sect_off), 17076 objfile_name (objfile)); 17077 17078 if (member_loc->form_is_section_offset ()) 17079 dwarf2_complex_location_expr_complaint (); 17080 else if (member_loc->form_is_constant () 17081 || member_loc->form_is_block ()) 17082 { 17083 if (attr != nullptr) 17084 mark_common_block_symbol_computed (sym, die, attr, 17085 member_loc, cu); 17086 } 17087 else 17088 dwarf2_complex_location_expr_complaint (); 17089 } 17090 } 17091 } 17092 17093 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu); 17094 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block; 17095 } 17096 } 17097 17098 /* Create a type for a C++ namespace. */ 17099 17100 static struct type * 17101 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu) 17102 { 17103 struct objfile *objfile = cu->per_objfile->objfile; 17104 const char *previous_prefix, *name; 17105 int is_anonymous; 17106 struct type *type; 17107 17108 /* For extensions, reuse the type of the original namespace. */ 17109 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL) 17110 { 17111 struct die_info *ext_die; 17112 struct dwarf2_cu *ext_cu = cu; 17113 17114 ext_die = dwarf2_extension (die, &ext_cu); 17115 type = read_type_die (ext_die, ext_cu); 17116 17117 /* EXT_CU may not be the same as CU. 17118 Ensure TYPE is recorded with CU in die_type_hash. */ 17119 return set_die_type (die, type, cu); 17120 } 17121 17122 name = namespace_name (die, &is_anonymous, cu); 17123 17124 /* Now build the name of the current namespace. */ 17125 17126 previous_prefix = determine_prefix (die, cu); 17127 if (previous_prefix[0] != '\0') 17128 name = typename_concat (&objfile->objfile_obstack, 17129 previous_prefix, name, 0, cu); 17130 17131 /* Create the type. */ 17132 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name); 17133 17134 return set_die_type (die, type, cu); 17135 } 17136 17137 /* Read a namespace scope. */ 17138 17139 static void 17140 read_namespace (struct die_info *die, struct dwarf2_cu *cu) 17141 { 17142 struct objfile *objfile = cu->per_objfile->objfile; 17143 int is_anonymous; 17144 17145 /* Add a symbol associated to this if we haven't seen the namespace 17146 before. Also, add a using directive if it's an anonymous 17147 namespace. */ 17148 17149 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL) 17150 { 17151 struct type *type; 17152 17153 type = read_type_die (die, cu); 17154 new_symbol (die, type, cu); 17155 17156 namespace_name (die, &is_anonymous, cu); 17157 if (is_anonymous) 17158 { 17159 const char *previous_prefix = determine_prefix (die, cu); 17160 17161 std::vector<const char *> excludes; 17162 add_using_directive (using_directives (cu), 17163 previous_prefix, type->name (), NULL, 17164 NULL, excludes, 0, &objfile->objfile_obstack); 17165 } 17166 } 17167 17168 if (die->child != NULL) 17169 { 17170 struct die_info *child_die = die->child; 17171 17172 while (child_die && child_die->tag) 17173 { 17174 process_die (child_die, cu); 17175 child_die = child_die->sibling; 17176 } 17177 } 17178 } 17179 17180 /* Read a Fortran module as type. This DIE can be only a declaration used for 17181 imported module. Still we need that type as local Fortran "use ... only" 17182 declaration imports depend on the created type in determine_prefix. */ 17183 17184 static struct type * 17185 read_module_type (struct die_info *die, struct dwarf2_cu *cu) 17186 { 17187 struct objfile *objfile = cu->per_objfile->objfile; 17188 const char *module_name; 17189 struct type *type; 17190 17191 module_name = dwarf2_name (die, cu); 17192 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name); 17193 17194 return set_die_type (die, type, cu); 17195 } 17196 17197 /* Read a Fortran module. */ 17198 17199 static void 17200 read_module (struct die_info *die, struct dwarf2_cu *cu) 17201 { 17202 struct die_info *child_die = die->child; 17203 struct type *type; 17204 17205 type = read_type_die (die, cu); 17206 new_symbol (die, type, cu); 17207 17208 while (child_die && child_die->tag) 17209 { 17210 process_die (child_die, cu); 17211 child_die = child_die->sibling; 17212 } 17213 } 17214 17215 /* Return the name of the namespace represented by DIE. Set 17216 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous 17217 namespace. */ 17218 17219 static const char * 17220 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu) 17221 { 17222 struct die_info *current_die; 17223 const char *name = NULL; 17224 17225 /* Loop through the extensions until we find a name. */ 17226 17227 for (current_die = die; 17228 current_die != NULL; 17229 current_die = dwarf2_extension (die, &cu)) 17230 { 17231 /* We don't use dwarf2_name here so that we can detect the absence 17232 of a name -> anonymous namespace. */ 17233 name = dwarf2_string_attr (die, DW_AT_name, cu); 17234 17235 if (name != NULL) 17236 break; 17237 } 17238 17239 /* Is it an anonymous namespace? */ 17240 17241 *is_anonymous = (name == NULL); 17242 if (*is_anonymous) 17243 name = CP_ANONYMOUS_NAMESPACE_STR; 17244 17245 return name; 17246 } 17247 17248 /* Extract all information from a DW_TAG_pointer_type DIE and add to 17249 the user defined type vector. */ 17250 17251 static struct type * 17252 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu) 17253 { 17254 struct gdbarch *gdbarch = cu->per_objfile->objfile->arch (); 17255 struct comp_unit_head *cu_header = &cu->header; 17256 struct type *type; 17257 struct attribute *attr_byte_size; 17258 struct attribute *attr_address_class; 17259 int byte_size, addr_class; 17260 struct type *target_type; 17261 17262 target_type = die_type (die, cu); 17263 17264 /* The die_type call above may have already set the type for this DIE. */ 17265 type = get_die_type (die, cu); 17266 if (type) 17267 return type; 17268 17269 type = lookup_pointer_type (target_type); 17270 17271 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu); 17272 if (attr_byte_size) 17273 byte_size = DW_UNSND (attr_byte_size); 17274 else 17275 byte_size = cu_header->addr_size; 17276 17277 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu); 17278 if (attr_address_class) 17279 addr_class = DW_UNSND (attr_address_class); 17280 else 17281 addr_class = DW_ADDR_none; 17282 17283 ULONGEST alignment = get_alignment (cu, die); 17284 17285 /* If the pointer size, alignment, or address class is different 17286 than the default, create a type variant marked as such and set 17287 the length accordingly. */ 17288 if (TYPE_LENGTH (type) != byte_size 17289 || (alignment != 0 && TYPE_RAW_ALIGN (type) != 0 17290 && alignment != TYPE_RAW_ALIGN (type)) 17291 || addr_class != DW_ADDR_none) 17292 { 17293 if (gdbarch_address_class_type_flags_p (gdbarch)) 17294 { 17295 int type_flags; 17296 17297 type_flags = gdbarch_address_class_type_flags 17298 (gdbarch, byte_size, addr_class); 17299 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL) 17300 == 0); 17301 type = make_type_with_address_space (type, type_flags); 17302 } 17303 else if (TYPE_LENGTH (type) != byte_size) 17304 { 17305 complaint (_("invalid pointer size %d"), byte_size); 17306 } 17307 else if (TYPE_RAW_ALIGN (type) != alignment) 17308 { 17309 complaint (_("Invalid DW_AT_alignment" 17310 " - DIE at %s [in module %s]"), 17311 sect_offset_str (die->sect_off), 17312 objfile_name (cu->per_objfile->objfile)); 17313 } 17314 else 17315 { 17316 /* Should we also complain about unhandled address classes? */ 17317 } 17318 } 17319 17320 TYPE_LENGTH (type) = byte_size; 17321 set_type_align (type, alignment); 17322 return set_die_type (die, type, cu); 17323 } 17324 17325 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to 17326 the user defined type vector. */ 17327 17328 static struct type * 17329 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu) 17330 { 17331 struct type *type; 17332 struct type *to_type; 17333 struct type *domain; 17334 17335 to_type = die_type (die, cu); 17336 domain = die_containing_type (die, cu); 17337 17338 /* The calls above may have already set the type for this DIE. */ 17339 type = get_die_type (die, cu); 17340 if (type) 17341 return type; 17342 17343 if (check_typedef (to_type)->code () == TYPE_CODE_METHOD) 17344 type = lookup_methodptr_type (to_type); 17345 else if (check_typedef (to_type)->code () == TYPE_CODE_FUNC) 17346 { 17347 struct type *new_type = alloc_type (cu->per_objfile->objfile); 17348 17349 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type), 17350 to_type->fields (), to_type->num_fields (), 17351 TYPE_VARARGS (to_type)); 17352 type = lookup_methodptr_type (new_type); 17353 } 17354 else 17355 type = lookup_memberptr_type (to_type, domain); 17356 17357 return set_die_type (die, type, cu); 17358 } 17359 17360 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to 17361 the user defined type vector. */ 17362 17363 static struct type * 17364 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu, 17365 enum type_code refcode) 17366 { 17367 struct comp_unit_head *cu_header = &cu->header; 17368 struct type *type, *target_type; 17369 struct attribute *attr; 17370 17371 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF); 17372 17373 target_type = die_type (die, cu); 17374 17375 /* The die_type call above may have already set the type for this DIE. */ 17376 type = get_die_type (die, cu); 17377 if (type) 17378 return type; 17379 17380 type = lookup_reference_type (target_type, refcode); 17381 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 17382 if (attr != nullptr) 17383 { 17384 TYPE_LENGTH (type) = DW_UNSND (attr); 17385 } 17386 else 17387 { 17388 TYPE_LENGTH (type) = cu_header->addr_size; 17389 } 17390 maybe_set_alignment (cu, die, type); 17391 return set_die_type (die, type, cu); 17392 } 17393 17394 /* Add the given cv-qualifiers to the element type of the array. GCC 17395 outputs DWARF type qualifiers that apply to an array, not the 17396 element type. But GDB relies on the array element type to carry 17397 the cv-qualifiers. This mimics section 6.7.3 of the C99 17398 specification. */ 17399 17400 static struct type * 17401 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu, 17402 struct type *base_type, int cnst, int voltl) 17403 { 17404 struct type *el_type, *inner_array; 17405 17406 base_type = copy_type (base_type); 17407 inner_array = base_type; 17408 17409 while (TYPE_TARGET_TYPE (inner_array)->code () == TYPE_CODE_ARRAY) 17410 { 17411 TYPE_TARGET_TYPE (inner_array) = 17412 copy_type (TYPE_TARGET_TYPE (inner_array)); 17413 inner_array = TYPE_TARGET_TYPE (inner_array); 17414 } 17415 17416 el_type = TYPE_TARGET_TYPE (inner_array); 17417 cnst |= TYPE_CONST (el_type); 17418 voltl |= TYPE_VOLATILE (el_type); 17419 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL); 17420 17421 return set_die_type (die, base_type, cu); 17422 } 17423 17424 static struct type * 17425 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu) 17426 { 17427 struct type *base_type, *cv_type; 17428 17429 base_type = die_type (die, cu); 17430 17431 /* The die_type call above may have already set the type for this DIE. */ 17432 cv_type = get_die_type (die, cu); 17433 if (cv_type) 17434 return cv_type; 17435 17436 /* In case the const qualifier is applied to an array type, the element type 17437 is so qualified, not the array type (section 6.7.3 of C99). */ 17438 if (base_type->code () == TYPE_CODE_ARRAY) 17439 return add_array_cv_type (die, cu, base_type, 1, 0); 17440 17441 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0); 17442 return set_die_type (die, cv_type, cu); 17443 } 17444 17445 static struct type * 17446 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu) 17447 { 17448 struct type *base_type, *cv_type; 17449 17450 base_type = die_type (die, cu); 17451 17452 /* The die_type call above may have already set the type for this DIE. */ 17453 cv_type = get_die_type (die, cu); 17454 if (cv_type) 17455 return cv_type; 17456 17457 /* In case the volatile qualifier is applied to an array type, the 17458 element type is so qualified, not the array type (section 6.7.3 17459 of C99). */ 17460 if (base_type->code () == TYPE_CODE_ARRAY) 17461 return add_array_cv_type (die, cu, base_type, 0, 1); 17462 17463 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0); 17464 return set_die_type (die, cv_type, cu); 17465 } 17466 17467 /* Handle DW_TAG_restrict_type. */ 17468 17469 static struct type * 17470 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu) 17471 { 17472 struct type *base_type, *cv_type; 17473 17474 base_type = die_type (die, cu); 17475 17476 /* The die_type call above may have already set the type for this DIE. */ 17477 cv_type = get_die_type (die, cu); 17478 if (cv_type) 17479 return cv_type; 17480 17481 cv_type = make_restrict_type (base_type); 17482 return set_die_type (die, cv_type, cu); 17483 } 17484 17485 /* Handle DW_TAG_atomic_type. */ 17486 17487 static struct type * 17488 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu) 17489 { 17490 struct type *base_type, *cv_type; 17491 17492 base_type = die_type (die, cu); 17493 17494 /* The die_type call above may have already set the type for this DIE. */ 17495 cv_type = get_die_type (die, cu); 17496 if (cv_type) 17497 return cv_type; 17498 17499 cv_type = make_atomic_type (base_type); 17500 return set_die_type (die, cv_type, cu); 17501 } 17502 17503 /* Extract all information from a DW_TAG_string_type DIE and add to 17504 the user defined type vector. It isn't really a user defined type, 17505 but it behaves like one, with other DIE's using an AT_user_def_type 17506 attribute to reference it. */ 17507 17508 static struct type * 17509 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu) 17510 { 17511 struct objfile *objfile = cu->per_objfile->objfile; 17512 struct gdbarch *gdbarch = objfile->arch (); 17513 struct type *type, *range_type, *index_type, *char_type; 17514 struct attribute *attr; 17515 struct dynamic_prop prop; 17516 bool length_is_constant = true; 17517 LONGEST length; 17518 17519 /* There are a couple of places where bit sizes might be made use of 17520 when parsing a DW_TAG_string_type, however, no producer that we know 17521 of make use of these. Handling bit sizes that are a multiple of the 17522 byte size is easy enough, but what about other bit sizes? Lets deal 17523 with that problem when we have to. Warn about these attributes being 17524 unsupported, then parse the type and ignore them like we always 17525 have. */ 17526 if (dwarf2_attr (die, DW_AT_bit_size, cu) != nullptr 17527 || dwarf2_attr (die, DW_AT_string_length_bit_size, cu) != nullptr) 17528 { 17529 static bool warning_printed = false; 17530 if (!warning_printed) 17531 { 17532 warning (_("DW_AT_bit_size and DW_AT_string_length_bit_size not " 17533 "currently supported on DW_TAG_string_type.")); 17534 warning_printed = true; 17535 } 17536 } 17537 17538 attr = dwarf2_attr (die, DW_AT_string_length, cu); 17539 if (attr != nullptr && !attr->form_is_constant ()) 17540 { 17541 /* The string length describes the location at which the length of 17542 the string can be found. The size of the length field can be 17543 specified with one of the attributes below. */ 17544 struct type *prop_type; 17545 struct attribute *len 17546 = dwarf2_attr (die, DW_AT_string_length_byte_size, cu); 17547 if (len == nullptr) 17548 len = dwarf2_attr (die, DW_AT_byte_size, cu); 17549 if (len != nullptr && len->form_is_constant ()) 17550 { 17551 /* Pass 0 as the default as we know this attribute is constant 17552 and the default value will not be returned. */ 17553 LONGEST sz = len->constant_value (0); 17554 prop_type = cu->per_objfile->int_type (sz, true); 17555 } 17556 else 17557 { 17558 /* If the size is not specified then we assume it is the size of 17559 an address on this target. */ 17560 prop_type = cu->addr_sized_int_type (true); 17561 } 17562 17563 /* Convert the attribute into a dynamic property. */ 17564 if (!attr_to_dynamic_prop (attr, die, cu, &prop, prop_type)) 17565 length = 1; 17566 else 17567 length_is_constant = false; 17568 } 17569 else if (attr != nullptr) 17570 { 17571 /* This DW_AT_string_length just contains the length with no 17572 indirection. There's no need to create a dynamic property in this 17573 case. Pass 0 for the default value as we know it will not be 17574 returned in this case. */ 17575 length = attr->constant_value (0); 17576 } 17577 else if ((attr = dwarf2_attr (die, DW_AT_byte_size, cu)) != nullptr) 17578 { 17579 /* We don't currently support non-constant byte sizes for strings. */ 17580 length = attr->constant_value (1); 17581 } 17582 else 17583 { 17584 /* Use 1 as a fallback length if we have nothing else. */ 17585 length = 1; 17586 } 17587 17588 index_type = objfile_type (objfile)->builtin_int; 17589 if (length_is_constant) 17590 range_type = create_static_range_type (NULL, index_type, 1, length); 17591 else 17592 { 17593 struct dynamic_prop low_bound; 17594 17595 low_bound.set_const_val (1); 17596 range_type = create_range_type (NULL, index_type, &low_bound, &prop, 0); 17597 } 17598 char_type = language_string_char_type (cu->language_defn, gdbarch); 17599 type = create_string_type (NULL, char_type, range_type); 17600 17601 return set_die_type (die, type, cu); 17602 } 17603 17604 /* Assuming that DIE corresponds to a function, returns nonzero 17605 if the function is prototyped. */ 17606 17607 static int 17608 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu) 17609 { 17610 struct attribute *attr; 17611 17612 attr = dwarf2_attr (die, DW_AT_prototyped, cu); 17613 if (attr && (DW_UNSND (attr) != 0)) 17614 return 1; 17615 17616 /* The DWARF standard implies that the DW_AT_prototyped attribute 17617 is only meaningful for C, but the concept also extends to other 17618 languages that allow unprototyped functions (Eg: Objective C). 17619 For all other languages, assume that functions are always 17620 prototyped. */ 17621 if (cu->language != language_c 17622 && cu->language != language_objc 17623 && cu->language != language_opencl) 17624 return 1; 17625 17626 /* RealView does not emit DW_AT_prototyped. We can not distinguish 17627 prototyped and unprototyped functions; default to prototyped, 17628 since that is more common in modern code (and RealView warns 17629 about unprototyped functions). */ 17630 if (producer_is_realview (cu->producer)) 17631 return 1; 17632 17633 return 0; 17634 } 17635 17636 /* Handle DIES due to C code like: 17637 17638 struct foo 17639 { 17640 int (*funcp)(int a, long l); 17641 int b; 17642 }; 17643 17644 ('funcp' generates a DW_TAG_subroutine_type DIE). */ 17645 17646 static struct type * 17647 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu) 17648 { 17649 struct objfile *objfile = cu->per_objfile->objfile; 17650 struct type *type; /* Type that this function returns. */ 17651 struct type *ftype; /* Function that returns above type. */ 17652 struct attribute *attr; 17653 17654 type = die_type (die, cu); 17655 17656 /* The die_type call above may have already set the type for this DIE. */ 17657 ftype = get_die_type (die, cu); 17658 if (ftype) 17659 return ftype; 17660 17661 ftype = lookup_function_type (type); 17662 17663 if (prototyped_function_p (die, cu)) 17664 TYPE_PROTOTYPED (ftype) = 1; 17665 17666 /* Store the calling convention in the type if it's available in 17667 the subroutine die. Otherwise set the calling convention to 17668 the default value DW_CC_normal. */ 17669 attr = dwarf2_attr (die, DW_AT_calling_convention, cu); 17670 if (attr != nullptr 17671 && is_valid_DW_AT_calling_convention_for_subroutine (DW_UNSND (attr))) 17672 TYPE_CALLING_CONVENTION (ftype) 17673 = (enum dwarf_calling_convention) (DW_UNSND (attr)); 17674 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL")) 17675 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL; 17676 else 17677 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal; 17678 17679 /* Record whether the function returns normally to its caller or not 17680 if the DWARF producer set that information. */ 17681 attr = dwarf2_attr (die, DW_AT_noreturn, cu); 17682 if (attr && (DW_UNSND (attr) != 0)) 17683 TYPE_NO_RETURN (ftype) = 1; 17684 17685 /* We need to add the subroutine type to the die immediately so 17686 we don't infinitely recurse when dealing with parameters 17687 declared as the same subroutine type. */ 17688 set_die_type (die, ftype, cu); 17689 17690 if (die->child != NULL) 17691 { 17692 struct type *void_type = objfile_type (objfile)->builtin_void; 17693 struct die_info *child_die; 17694 int nparams, iparams; 17695 17696 /* Count the number of parameters. 17697 FIXME: GDB currently ignores vararg functions, but knows about 17698 vararg member functions. */ 17699 nparams = 0; 17700 child_die = die->child; 17701 while (child_die && child_die->tag) 17702 { 17703 if (child_die->tag == DW_TAG_formal_parameter) 17704 nparams++; 17705 else if (child_die->tag == DW_TAG_unspecified_parameters) 17706 TYPE_VARARGS (ftype) = 1; 17707 child_die = child_die->sibling; 17708 } 17709 17710 /* Allocate storage for parameters and fill them in. */ 17711 ftype->set_num_fields (nparams); 17712 ftype->set_fields 17713 ((struct field *) TYPE_ZALLOC (ftype, nparams * sizeof (struct field))); 17714 17715 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it 17716 even if we error out during the parameters reading below. */ 17717 for (iparams = 0; iparams < nparams; iparams++) 17718 ftype->field (iparams).set_type (void_type); 17719 17720 iparams = 0; 17721 child_die = die->child; 17722 while (child_die && child_die->tag) 17723 { 17724 if (child_die->tag == DW_TAG_formal_parameter) 17725 { 17726 struct type *arg_type; 17727 17728 /* DWARF version 2 has no clean way to discern C++ 17729 static and non-static member functions. G++ helps 17730 GDB by marking the first parameter for non-static 17731 member functions (which is the this pointer) as 17732 artificial. We pass this information to 17733 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL. 17734 17735 DWARF version 3 added DW_AT_object_pointer, which GCC 17736 4.5 does not yet generate. */ 17737 attr = dwarf2_attr (child_die, DW_AT_artificial, cu); 17738 if (attr != nullptr) 17739 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr); 17740 else 17741 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0; 17742 arg_type = die_type (child_die, cu); 17743 17744 /* RealView does not mark THIS as const, which the testsuite 17745 expects. GCC marks THIS as const in method definitions, 17746 but not in the class specifications (GCC PR 43053). */ 17747 if (cu->language == language_cplus && !TYPE_CONST (arg_type) 17748 && TYPE_FIELD_ARTIFICIAL (ftype, iparams)) 17749 { 17750 int is_this = 0; 17751 struct dwarf2_cu *arg_cu = cu; 17752 const char *name = dwarf2_name (child_die, cu); 17753 17754 attr = dwarf2_attr (die, DW_AT_object_pointer, cu); 17755 if (attr != nullptr) 17756 { 17757 /* If the compiler emits this, use it. */ 17758 if (follow_die_ref (die, attr, &arg_cu) == child_die) 17759 is_this = 1; 17760 } 17761 else if (name && strcmp (name, "this") == 0) 17762 /* Function definitions will have the argument names. */ 17763 is_this = 1; 17764 else if (name == NULL && iparams == 0) 17765 /* Declarations may not have the names, so like 17766 elsewhere in GDB, assume an artificial first 17767 argument is "this". */ 17768 is_this = 1; 17769 17770 if (is_this) 17771 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type), 17772 arg_type, 0); 17773 } 17774 17775 ftype->field (iparams).set_type (arg_type); 17776 iparams++; 17777 } 17778 child_die = child_die->sibling; 17779 } 17780 } 17781 17782 return ftype; 17783 } 17784 17785 static struct type * 17786 read_typedef (struct die_info *die, struct dwarf2_cu *cu) 17787 { 17788 struct objfile *objfile = cu->per_objfile->objfile; 17789 const char *name = NULL; 17790 struct type *this_type, *target_type; 17791 17792 name = dwarf2_full_name (NULL, die, cu); 17793 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name); 17794 TYPE_TARGET_STUB (this_type) = 1; 17795 set_die_type (die, this_type, cu); 17796 target_type = die_type (die, cu); 17797 if (target_type != this_type) 17798 TYPE_TARGET_TYPE (this_type) = target_type; 17799 else 17800 { 17801 /* Self-referential typedefs are, it seems, not allowed by the DWARF 17802 spec and cause infinite loops in GDB. */ 17803 complaint (_("Self-referential DW_TAG_typedef " 17804 "- DIE at %s [in module %s]"), 17805 sect_offset_str (die->sect_off), objfile_name (objfile)); 17806 TYPE_TARGET_TYPE (this_type) = NULL; 17807 } 17808 if (name == NULL) 17809 { 17810 /* Gcc-7 and before supports -feliminate-dwarf2-dups, which generates 17811 anonymous typedefs, which is, strictly speaking, invalid DWARF. 17812 Handle these by just returning the target type, rather than 17813 constructing an anonymous typedef type and trying to handle this 17814 elsewhere. */ 17815 set_die_type (die, target_type, cu); 17816 return target_type; 17817 } 17818 return this_type; 17819 } 17820 17821 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT 17822 (which may be different from NAME) to the architecture back-end to allow 17823 it to guess the correct format if necessary. */ 17824 17825 static struct type * 17826 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name, 17827 const char *name_hint, enum bfd_endian byte_order) 17828 { 17829 struct gdbarch *gdbarch = objfile->arch (); 17830 const struct floatformat **format; 17831 struct type *type; 17832 17833 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits); 17834 if (format) 17835 type = init_float_type (objfile, bits, name, format, byte_order); 17836 else 17837 type = init_type (objfile, TYPE_CODE_ERROR, bits, name); 17838 17839 return type; 17840 } 17841 17842 /* Allocate an integer type of size BITS and name NAME. */ 17843 17844 static struct type * 17845 dwarf2_init_integer_type (struct dwarf2_cu *cu, struct objfile *objfile, 17846 int bits, int unsigned_p, const char *name) 17847 { 17848 struct type *type; 17849 17850 /* Versions of Intel's C Compiler generate an integer type called "void" 17851 instead of using DW_TAG_unspecified_type. This has been seen on 17852 at least versions 14, 17, and 18. */ 17853 if (bits == 0 && producer_is_icc (cu) && name != nullptr 17854 && strcmp (name, "void") == 0) 17855 type = objfile_type (objfile)->builtin_void; 17856 else 17857 type = init_integer_type (objfile, bits, unsigned_p, name); 17858 17859 return type; 17860 } 17861 17862 /* Initialise and return a floating point type of size BITS suitable for 17863 use as a component of a complex number. The NAME_HINT is passed through 17864 when initialising the floating point type and is the name of the complex 17865 type. 17866 17867 As DWARF doesn't currently provide an explicit name for the components 17868 of a complex number, but it can be helpful to have these components 17869 named, we try to select a suitable name based on the size of the 17870 component. */ 17871 static struct type * 17872 dwarf2_init_complex_target_type (struct dwarf2_cu *cu, 17873 struct objfile *objfile, 17874 int bits, const char *name_hint, 17875 enum bfd_endian byte_order) 17876 { 17877 gdbarch *gdbarch = objfile->arch (); 17878 struct type *tt = nullptr; 17879 17880 /* Try to find a suitable floating point builtin type of size BITS. 17881 We're going to use the name of this type as the name for the complex 17882 target type that we are about to create. */ 17883 switch (cu->language) 17884 { 17885 case language_fortran: 17886 switch (bits) 17887 { 17888 case 32: 17889 tt = builtin_f_type (gdbarch)->builtin_real; 17890 break; 17891 case 64: 17892 tt = builtin_f_type (gdbarch)->builtin_real_s8; 17893 break; 17894 case 96: /* The x86-32 ABI specifies 96-bit long double. */ 17895 case 128: 17896 tt = builtin_f_type (gdbarch)->builtin_real_s16; 17897 break; 17898 } 17899 break; 17900 default: 17901 switch (bits) 17902 { 17903 case 32: 17904 tt = builtin_type (gdbarch)->builtin_float; 17905 break; 17906 case 64: 17907 tt = builtin_type (gdbarch)->builtin_double; 17908 break; 17909 case 96: /* The x86-32 ABI specifies 96-bit long double. */ 17910 case 128: 17911 tt = builtin_type (gdbarch)->builtin_long_double; 17912 break; 17913 } 17914 break; 17915 } 17916 17917 /* If the type we found doesn't match the size we were looking for, then 17918 pretend we didn't find a type at all, the complex target type we 17919 create will then be nameless. */ 17920 if (tt != nullptr && TYPE_LENGTH (tt) * TARGET_CHAR_BIT != bits) 17921 tt = nullptr; 17922 17923 const char *name = (tt == nullptr) ? nullptr : tt->name (); 17924 return dwarf2_init_float_type (objfile, bits, name, name_hint, byte_order); 17925 } 17926 17927 /* Find a representation of a given base type and install 17928 it in the TYPE field of the die. */ 17929 17930 static struct type * 17931 read_base_type (struct die_info *die, struct dwarf2_cu *cu) 17932 { 17933 struct objfile *objfile = cu->per_objfile->objfile; 17934 struct type *type; 17935 struct attribute *attr; 17936 int encoding = 0, bits = 0; 17937 const char *name; 17938 gdbarch *arch; 17939 17940 attr = dwarf2_attr (die, DW_AT_encoding, cu); 17941 if (attr != nullptr) 17942 encoding = DW_UNSND (attr); 17943 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 17944 if (attr != nullptr) 17945 bits = DW_UNSND (attr) * TARGET_CHAR_BIT; 17946 name = dwarf2_name (die, cu); 17947 if (!name) 17948 complaint (_("DW_AT_name missing from DW_TAG_base_type")); 17949 17950 arch = objfile->arch (); 17951 enum bfd_endian byte_order = gdbarch_byte_order (arch); 17952 17953 attr = dwarf2_attr (die, DW_AT_endianity, cu); 17954 if (attr) 17955 { 17956 int endianity = DW_UNSND (attr); 17957 17958 switch (endianity) 17959 { 17960 case DW_END_big: 17961 byte_order = BFD_ENDIAN_BIG; 17962 break; 17963 case DW_END_little: 17964 byte_order = BFD_ENDIAN_LITTLE; 17965 break; 17966 default: 17967 complaint (_("DW_AT_endianity has unrecognized value %d"), endianity); 17968 break; 17969 } 17970 } 17971 17972 switch (encoding) 17973 { 17974 case DW_ATE_address: 17975 /* Turn DW_ATE_address into a void * pointer. */ 17976 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL); 17977 type = init_pointer_type (objfile, bits, name, type); 17978 break; 17979 case DW_ATE_boolean: 17980 type = init_boolean_type (objfile, bits, 1, name); 17981 break; 17982 case DW_ATE_complex_float: 17983 type = dwarf2_init_complex_target_type (cu, objfile, bits / 2, name, 17984 byte_order); 17985 if (type->code () == TYPE_CODE_ERROR) 17986 { 17987 if (name == nullptr) 17988 { 17989 struct obstack *obstack 17990 = &cu->per_objfile->objfile->objfile_obstack; 17991 name = obconcat (obstack, "_Complex ", type->name (), 17992 nullptr); 17993 } 17994 type = init_type (objfile, TYPE_CODE_ERROR, bits, name); 17995 } 17996 else 17997 type = init_complex_type (name, type); 17998 break; 17999 case DW_ATE_decimal_float: 18000 type = init_decfloat_type (objfile, bits, name); 18001 break; 18002 case DW_ATE_float: 18003 type = dwarf2_init_float_type (objfile, bits, name, name, byte_order); 18004 break; 18005 case DW_ATE_signed: 18006 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name); 18007 break; 18008 case DW_ATE_unsigned: 18009 if (cu->language == language_fortran 18010 && name 18011 && startswith (name, "character(")) 18012 type = init_character_type (objfile, bits, 1, name); 18013 else 18014 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name); 18015 break; 18016 case DW_ATE_signed_char: 18017 if (cu->language == language_ada || cu->language == language_m2 18018 || cu->language == language_pascal 18019 || cu->language == language_fortran) 18020 type = init_character_type (objfile, bits, 0, name); 18021 else 18022 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name); 18023 break; 18024 case DW_ATE_unsigned_char: 18025 if (cu->language == language_ada || cu->language == language_m2 18026 || cu->language == language_pascal 18027 || cu->language == language_fortran 18028 || cu->language == language_rust) 18029 type = init_character_type (objfile, bits, 1, name); 18030 else 18031 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name); 18032 break; 18033 case DW_ATE_UTF: 18034 { 18035 if (bits == 16) 18036 type = builtin_type (arch)->builtin_char16; 18037 else if (bits == 32) 18038 type = builtin_type (arch)->builtin_char32; 18039 else 18040 { 18041 complaint (_("unsupported DW_ATE_UTF bit size: '%d'"), 18042 bits); 18043 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name); 18044 } 18045 return set_die_type (die, type, cu); 18046 } 18047 break; 18048 18049 default: 18050 complaint (_("unsupported DW_AT_encoding: '%s'"), 18051 dwarf_type_encoding_name (encoding)); 18052 type = init_type (objfile, TYPE_CODE_ERROR, bits, name); 18053 break; 18054 } 18055 18056 if (name && strcmp (name, "char") == 0) 18057 TYPE_NOSIGN (type) = 1; 18058 18059 maybe_set_alignment (cu, die, type); 18060 18061 TYPE_ENDIANITY_NOT_DEFAULT (type) = gdbarch_byte_order (arch) != byte_order; 18062 18063 return set_die_type (die, type, cu); 18064 } 18065 18066 /* Parse dwarf attribute if it's a block, reference or constant and put the 18067 resulting value of the attribute into struct bound_prop. 18068 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */ 18069 18070 static int 18071 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die, 18072 struct dwarf2_cu *cu, struct dynamic_prop *prop, 18073 struct type *default_type) 18074 { 18075 struct dwarf2_property_baton *baton; 18076 dwarf2_per_objfile *per_objfile = cu->per_objfile; 18077 struct objfile *objfile = per_objfile->objfile; 18078 struct obstack *obstack = &objfile->objfile_obstack; 18079 18080 gdb_assert (default_type != NULL); 18081 18082 if (attr == NULL || prop == NULL) 18083 return 0; 18084 18085 if (attr->form_is_block ()) 18086 { 18087 baton = XOBNEW (obstack, struct dwarf2_property_baton); 18088 baton->property_type = default_type; 18089 baton->locexpr.per_cu = cu->per_cu; 18090 baton->locexpr.per_objfile = per_objfile; 18091 baton->locexpr.size = DW_BLOCK (attr)->size; 18092 baton->locexpr.data = DW_BLOCK (attr)->data; 18093 switch (attr->name) 18094 { 18095 case DW_AT_string_length: 18096 baton->locexpr.is_reference = true; 18097 break; 18098 default: 18099 baton->locexpr.is_reference = false; 18100 break; 18101 } 18102 18103 prop->set_locexpr (baton); 18104 gdb_assert (prop->baton () != NULL); 18105 } 18106 else if (attr->form_is_ref ()) 18107 { 18108 struct dwarf2_cu *target_cu = cu; 18109 struct die_info *target_die; 18110 struct attribute *target_attr; 18111 18112 target_die = follow_die_ref (die, attr, &target_cu); 18113 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu); 18114 if (target_attr == NULL) 18115 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location, 18116 target_cu); 18117 if (target_attr == NULL) 18118 return 0; 18119 18120 switch (target_attr->name) 18121 { 18122 case DW_AT_location: 18123 if (target_attr->form_is_section_offset ()) 18124 { 18125 baton = XOBNEW (obstack, struct dwarf2_property_baton); 18126 baton->property_type = die_type (target_die, target_cu); 18127 fill_in_loclist_baton (cu, &baton->loclist, target_attr); 18128 prop->set_loclist (baton); 18129 gdb_assert (prop->baton () != NULL); 18130 } 18131 else if (target_attr->form_is_block ()) 18132 { 18133 baton = XOBNEW (obstack, struct dwarf2_property_baton); 18134 baton->property_type = die_type (target_die, target_cu); 18135 baton->locexpr.per_cu = cu->per_cu; 18136 baton->locexpr.per_objfile = per_objfile; 18137 baton->locexpr.size = DW_BLOCK (target_attr)->size; 18138 baton->locexpr.data = DW_BLOCK (target_attr)->data; 18139 baton->locexpr.is_reference = true; 18140 prop->set_locexpr (baton); 18141 gdb_assert (prop->baton () != NULL); 18142 } 18143 else 18144 { 18145 dwarf2_invalid_attrib_class_complaint ("DW_AT_location", 18146 "dynamic property"); 18147 return 0; 18148 } 18149 break; 18150 case DW_AT_data_member_location: 18151 { 18152 LONGEST offset; 18153 18154 if (!handle_data_member_location (target_die, target_cu, 18155 &offset)) 18156 return 0; 18157 18158 baton = XOBNEW (obstack, struct dwarf2_property_baton); 18159 baton->property_type = read_type_die (target_die->parent, 18160 target_cu); 18161 baton->offset_info.offset = offset; 18162 baton->offset_info.type = die_type (target_die, target_cu); 18163 prop->set_addr_offset (baton); 18164 break; 18165 } 18166 } 18167 } 18168 else if (attr->form_is_constant ()) 18169 prop->set_const_val (attr->constant_value (0)); 18170 else 18171 { 18172 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form), 18173 dwarf2_name (die, cu)); 18174 return 0; 18175 } 18176 18177 return 1; 18178 } 18179 18180 /* See read.h. */ 18181 18182 struct type * 18183 dwarf2_per_objfile::int_type (int size_in_bytes, bool unsigned_p) const 18184 { 18185 struct type *int_type; 18186 18187 /* Helper macro to examine the various builtin types. */ 18188 #define TRY_TYPE(F) \ 18189 int_type = (unsigned_p \ 18190 ? objfile_type (objfile)->builtin_unsigned_ ## F \ 18191 : objfile_type (objfile)->builtin_ ## F); \ 18192 if (int_type != NULL && TYPE_LENGTH (int_type) == size_in_bytes) \ 18193 return int_type 18194 18195 TRY_TYPE (char); 18196 TRY_TYPE (short); 18197 TRY_TYPE (int); 18198 TRY_TYPE (long); 18199 TRY_TYPE (long_long); 18200 18201 #undef TRY_TYPE 18202 18203 gdb_assert_not_reached ("unable to find suitable integer type"); 18204 } 18205 18206 /* See read.h. */ 18207 18208 struct type * 18209 dwarf2_cu::addr_sized_int_type (bool unsigned_p) const 18210 { 18211 int addr_size = this->per_cu->addr_size (); 18212 return this->per_objfile->int_type (addr_size, unsigned_p); 18213 } 18214 18215 /* Read the DW_AT_type attribute for a sub-range. If this attribute is not 18216 present (which is valid) then compute the default type based on the 18217 compilation units address size. */ 18218 18219 static struct type * 18220 read_subrange_index_type (struct die_info *die, struct dwarf2_cu *cu) 18221 { 18222 struct type *index_type = die_type (die, cu); 18223 18224 /* Dwarf-2 specifications explicitly allows to create subrange types 18225 without specifying a base type. 18226 In that case, the base type must be set to the type of 18227 the lower bound, upper bound or count, in that order, if any of these 18228 three attributes references an object that has a type. 18229 If no base type is found, the Dwarf-2 specifications say that 18230 a signed integer type of size equal to the size of an address should 18231 be used. 18232 For the following C code: `extern char gdb_int [];' 18233 GCC produces an empty range DIE. 18234 FIXME: muller/2010-05-28: Possible references to object for low bound, 18235 high bound or count are not yet handled by this code. */ 18236 if (index_type->code () == TYPE_CODE_VOID) 18237 index_type = cu->addr_sized_int_type (false); 18238 18239 return index_type; 18240 } 18241 18242 /* Read the given DW_AT_subrange DIE. */ 18243 18244 static struct type * 18245 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu) 18246 { 18247 struct type *base_type, *orig_base_type; 18248 struct type *range_type; 18249 struct attribute *attr; 18250 struct dynamic_prop low, high; 18251 int low_default_is_valid; 18252 int high_bound_is_count = 0; 18253 const char *name; 18254 ULONGEST negative_mask; 18255 18256 orig_base_type = read_subrange_index_type (die, cu); 18257 18258 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED, 18259 whereas the real type might be. So, we use ORIG_BASE_TYPE when 18260 creating the range type, but we use the result of check_typedef 18261 when examining properties of the type. */ 18262 base_type = check_typedef (orig_base_type); 18263 18264 /* The die_type call above may have already set the type for this DIE. */ 18265 range_type = get_die_type (die, cu); 18266 if (range_type) 18267 return range_type; 18268 18269 high.set_const_val (0); 18270 18271 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow 18272 omitting DW_AT_lower_bound. */ 18273 switch (cu->language) 18274 { 18275 case language_c: 18276 case language_cplus: 18277 low.set_const_val (0); 18278 low_default_is_valid = 1; 18279 break; 18280 case language_fortran: 18281 low.set_const_val (1); 18282 low_default_is_valid = 1; 18283 break; 18284 case language_d: 18285 case language_objc: 18286 case language_rust: 18287 low.set_const_val (0); 18288 low_default_is_valid = (cu->header.version >= 4); 18289 break; 18290 case language_ada: 18291 case language_m2: 18292 case language_pascal: 18293 low.set_const_val (1); 18294 low_default_is_valid = (cu->header.version >= 4); 18295 break; 18296 default: 18297 low.set_const_val (0); 18298 low_default_is_valid = 0; 18299 break; 18300 } 18301 18302 attr = dwarf2_attr (die, DW_AT_lower_bound, cu); 18303 if (attr != nullptr) 18304 attr_to_dynamic_prop (attr, die, cu, &low, base_type); 18305 else if (!low_default_is_valid) 18306 complaint (_("Missing DW_AT_lower_bound " 18307 "- DIE at %s [in module %s]"), 18308 sect_offset_str (die->sect_off), 18309 objfile_name (cu->per_objfile->objfile)); 18310 18311 struct attribute *attr_ub, *attr_count; 18312 attr = attr_ub = dwarf2_attr (die, DW_AT_upper_bound, cu); 18313 if (!attr_to_dynamic_prop (attr, die, cu, &high, base_type)) 18314 { 18315 attr = attr_count = dwarf2_attr (die, DW_AT_count, cu); 18316 if (attr_to_dynamic_prop (attr, die, cu, &high, base_type)) 18317 { 18318 /* If bounds are constant do the final calculation here. */ 18319 if (low.kind () == PROP_CONST && high.kind () == PROP_CONST) 18320 high.set_const_val (low.const_val () + high.const_val () - 1); 18321 else 18322 high_bound_is_count = 1; 18323 } 18324 else 18325 { 18326 if (attr_ub != NULL) 18327 complaint (_("Unresolved DW_AT_upper_bound " 18328 "- DIE at %s [in module %s]"), 18329 sect_offset_str (die->sect_off), 18330 objfile_name (cu->per_objfile->objfile)); 18331 if (attr_count != NULL) 18332 complaint (_("Unresolved DW_AT_count " 18333 "- DIE at %s [in module %s]"), 18334 sect_offset_str (die->sect_off), 18335 objfile_name (cu->per_objfile->objfile)); 18336 } 18337 } 18338 18339 LONGEST bias = 0; 18340 struct attribute *bias_attr = dwarf2_attr (die, DW_AT_GNU_bias, cu); 18341 if (bias_attr != nullptr && bias_attr->form_is_constant ()) 18342 bias = bias_attr->constant_value (0); 18343 18344 /* Normally, the DWARF producers are expected to use a signed 18345 constant form (Eg. DW_FORM_sdata) to express negative bounds. 18346 But this is unfortunately not always the case, as witnessed 18347 with GCC, for instance, where the ambiguous DW_FORM_dataN form 18348 is used instead. To work around that ambiguity, we treat 18349 the bounds as signed, and thus sign-extend their values, when 18350 the base type is signed. */ 18351 negative_mask = 18352 -((ULONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1)); 18353 if (low.kind () == PROP_CONST 18354 && !TYPE_UNSIGNED (base_type) && (low.const_val () & negative_mask)) 18355 low.set_const_val (low.const_val () | negative_mask); 18356 if (high.kind () == PROP_CONST 18357 && !TYPE_UNSIGNED (base_type) && (high.const_val () & negative_mask)) 18358 high.set_const_val (high.const_val () | negative_mask); 18359 18360 /* Check for bit and byte strides. */ 18361 struct dynamic_prop byte_stride_prop; 18362 attribute *attr_byte_stride = dwarf2_attr (die, DW_AT_byte_stride, cu); 18363 if (attr_byte_stride != nullptr) 18364 { 18365 struct type *prop_type = cu->addr_sized_int_type (false); 18366 attr_to_dynamic_prop (attr_byte_stride, die, cu, &byte_stride_prop, 18367 prop_type); 18368 } 18369 18370 struct dynamic_prop bit_stride_prop; 18371 attribute *attr_bit_stride = dwarf2_attr (die, DW_AT_bit_stride, cu); 18372 if (attr_bit_stride != nullptr) 18373 { 18374 /* It only makes sense to have either a bit or byte stride. */ 18375 if (attr_byte_stride != nullptr) 18376 { 18377 complaint (_("Found DW_AT_bit_stride and DW_AT_byte_stride " 18378 "- DIE at %s [in module %s]"), 18379 sect_offset_str (die->sect_off), 18380 objfile_name (cu->per_objfile->objfile)); 18381 attr_bit_stride = nullptr; 18382 } 18383 else 18384 { 18385 struct type *prop_type = cu->addr_sized_int_type (false); 18386 attr_to_dynamic_prop (attr_bit_stride, die, cu, &bit_stride_prop, 18387 prop_type); 18388 } 18389 } 18390 18391 if (attr_byte_stride != nullptr 18392 || attr_bit_stride != nullptr) 18393 { 18394 bool byte_stride_p = (attr_byte_stride != nullptr); 18395 struct dynamic_prop *stride 18396 = byte_stride_p ? &byte_stride_prop : &bit_stride_prop; 18397 18398 range_type 18399 = create_range_type_with_stride (NULL, orig_base_type, &low, 18400 &high, bias, stride, byte_stride_p); 18401 } 18402 else 18403 range_type = create_range_type (NULL, orig_base_type, &low, &high, bias); 18404 18405 if (high_bound_is_count) 18406 range_type->bounds ()->flag_upper_bound_is_count = 1; 18407 18408 /* Ada expects an empty array on no boundary attributes. */ 18409 if (attr == NULL && cu->language != language_ada) 18410 range_type->bounds ()->high.set_undefined (); 18411 18412 name = dwarf2_name (die, cu); 18413 if (name) 18414 range_type->set_name (name); 18415 18416 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 18417 if (attr != nullptr) 18418 TYPE_LENGTH (range_type) = DW_UNSND (attr); 18419 18420 maybe_set_alignment (cu, die, range_type); 18421 18422 set_die_type (die, range_type, cu); 18423 18424 /* set_die_type should be already done. */ 18425 set_descriptive_type (range_type, die, cu); 18426 18427 return range_type; 18428 } 18429 18430 static struct type * 18431 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu) 18432 { 18433 struct type *type; 18434 18435 type = init_type (cu->per_objfile->objfile, TYPE_CODE_VOID, 0, NULL); 18436 type->set_name (dwarf2_name (die, cu)); 18437 18438 /* In Ada, an unspecified type is typically used when the description 18439 of the type is deferred to a different unit. When encountering 18440 such a type, we treat it as a stub, and try to resolve it later on, 18441 when needed. */ 18442 if (cu->language == language_ada) 18443 TYPE_STUB (type) = 1; 18444 18445 return set_die_type (die, type, cu); 18446 } 18447 18448 /* Read a single die and all its descendents. Set the die's sibling 18449 field to NULL; set other fields in the die correctly, and set all 18450 of the descendents' fields correctly. Set *NEW_INFO_PTR to the 18451 location of the info_ptr after reading all of those dies. PARENT 18452 is the parent of the die in question. */ 18453 18454 static struct die_info * 18455 read_die_and_children (const struct die_reader_specs *reader, 18456 const gdb_byte *info_ptr, 18457 const gdb_byte **new_info_ptr, 18458 struct die_info *parent) 18459 { 18460 struct die_info *die; 18461 const gdb_byte *cur_ptr; 18462 18463 cur_ptr = read_full_die_1 (reader, &die, info_ptr, 0); 18464 if (die == NULL) 18465 { 18466 *new_info_ptr = cur_ptr; 18467 return NULL; 18468 } 18469 store_in_ref_table (die, reader->cu); 18470 18471 if (die->has_children) 18472 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die); 18473 else 18474 { 18475 die->child = NULL; 18476 *new_info_ptr = cur_ptr; 18477 } 18478 18479 die->sibling = NULL; 18480 die->parent = parent; 18481 return die; 18482 } 18483 18484 /* Read a die, all of its descendents, and all of its siblings; set 18485 all of the fields of all of the dies correctly. Arguments are as 18486 in read_die_and_children. */ 18487 18488 static struct die_info * 18489 read_die_and_siblings_1 (const struct die_reader_specs *reader, 18490 const gdb_byte *info_ptr, 18491 const gdb_byte **new_info_ptr, 18492 struct die_info *parent) 18493 { 18494 struct die_info *first_die, *last_sibling; 18495 const gdb_byte *cur_ptr; 18496 18497 cur_ptr = info_ptr; 18498 first_die = last_sibling = NULL; 18499 18500 while (1) 18501 { 18502 struct die_info *die 18503 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent); 18504 18505 if (die == NULL) 18506 { 18507 *new_info_ptr = cur_ptr; 18508 return first_die; 18509 } 18510 18511 if (!first_die) 18512 first_die = die; 18513 else 18514 last_sibling->sibling = die; 18515 18516 last_sibling = die; 18517 } 18518 } 18519 18520 /* Read a die, all of its descendents, and all of its siblings; set 18521 all of the fields of all of the dies correctly. Arguments are as 18522 in read_die_and_children. 18523 This the main entry point for reading a DIE and all its children. */ 18524 18525 static struct die_info * 18526 read_die_and_siblings (const struct die_reader_specs *reader, 18527 const gdb_byte *info_ptr, 18528 const gdb_byte **new_info_ptr, 18529 struct die_info *parent) 18530 { 18531 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr, 18532 new_info_ptr, parent); 18533 18534 if (dwarf_die_debug) 18535 { 18536 fprintf_unfiltered (gdb_stdlog, 18537 "Read die from %s@0x%x of %s:\n", 18538 reader->die_section->get_name (), 18539 (unsigned) (info_ptr - reader->die_section->buffer), 18540 bfd_get_filename (reader->abfd)); 18541 dump_die (die, dwarf_die_debug); 18542 } 18543 18544 return die; 18545 } 18546 18547 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS 18548 attributes. 18549 The caller is responsible for filling in the extra attributes 18550 and updating (*DIEP)->num_attrs. 18551 Set DIEP to point to a newly allocated die with its information, 18552 except for its child, sibling, and parent fields. */ 18553 18554 static const gdb_byte * 18555 read_full_die_1 (const struct die_reader_specs *reader, 18556 struct die_info **diep, const gdb_byte *info_ptr, 18557 int num_extra_attrs) 18558 { 18559 unsigned int abbrev_number, bytes_read, i; 18560 struct abbrev_info *abbrev; 18561 struct die_info *die; 18562 struct dwarf2_cu *cu = reader->cu; 18563 bfd *abfd = reader->abfd; 18564 18565 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer); 18566 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 18567 info_ptr += bytes_read; 18568 if (!abbrev_number) 18569 { 18570 *diep = NULL; 18571 return info_ptr; 18572 } 18573 18574 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number); 18575 if (!abbrev) 18576 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"), 18577 abbrev_number, 18578 bfd_get_filename (abfd)); 18579 18580 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs); 18581 die->sect_off = sect_off; 18582 die->tag = abbrev->tag; 18583 die->abbrev = abbrev_number; 18584 die->has_children = abbrev->has_children; 18585 18586 /* Make the result usable. 18587 The caller needs to update num_attrs after adding the extra 18588 attributes. */ 18589 die->num_attrs = abbrev->num_attrs; 18590 18591 std::vector<int> indexes_that_need_reprocess; 18592 for (i = 0; i < abbrev->num_attrs; ++i) 18593 { 18594 bool need_reprocess; 18595 info_ptr = 18596 read_attribute (reader, &die->attrs[i], &abbrev->attrs[i], 18597 info_ptr, &need_reprocess); 18598 if (need_reprocess) 18599 indexes_that_need_reprocess.push_back (i); 18600 } 18601 18602 struct attribute *attr = die->attr (DW_AT_str_offsets_base); 18603 if (attr != nullptr) 18604 cu->str_offsets_base = DW_UNSND (attr); 18605 18606 attr = die->attr (DW_AT_loclists_base); 18607 if (attr != nullptr) 18608 cu->loclist_base = DW_UNSND (attr); 18609 18610 auto maybe_addr_base = die->addr_base (); 18611 if (maybe_addr_base.has_value ()) 18612 cu->addr_base = *maybe_addr_base; 18613 18614 attr = die->attr (DW_AT_rnglists_base); 18615 if (attr != nullptr) 18616 cu->ranges_base = DW_UNSND (attr); 18617 18618 for (int index : indexes_that_need_reprocess) 18619 read_attribute_reprocess (reader, &die->attrs[index], die->tag); 18620 *diep = die; 18621 return info_ptr; 18622 } 18623 18624 /* Read a die and all its attributes. 18625 Set DIEP to point to a newly allocated die with its information, 18626 except for its child, sibling, and parent fields. */ 18627 18628 static const gdb_byte * 18629 read_full_die (const struct die_reader_specs *reader, 18630 struct die_info **diep, const gdb_byte *info_ptr) 18631 { 18632 const gdb_byte *result; 18633 18634 result = read_full_die_1 (reader, diep, info_ptr, 0); 18635 18636 if (dwarf_die_debug) 18637 { 18638 fprintf_unfiltered (gdb_stdlog, 18639 "Read die from %s@0x%x of %s:\n", 18640 reader->die_section->get_name (), 18641 (unsigned) (info_ptr - reader->die_section->buffer), 18642 bfd_get_filename (reader->abfd)); 18643 dump_die (*diep, dwarf_die_debug); 18644 } 18645 18646 return result; 18647 } 18648 18649 18650 /* Returns nonzero if TAG represents a type that we might generate a partial 18651 symbol for. */ 18652 18653 static int 18654 is_type_tag_for_partial (int tag) 18655 { 18656 switch (tag) 18657 { 18658 #if 0 18659 /* Some types that would be reasonable to generate partial symbols for, 18660 that we don't at present. */ 18661 case DW_TAG_array_type: 18662 case DW_TAG_file_type: 18663 case DW_TAG_ptr_to_member_type: 18664 case DW_TAG_set_type: 18665 case DW_TAG_string_type: 18666 case DW_TAG_subroutine_type: 18667 #endif 18668 case DW_TAG_base_type: 18669 case DW_TAG_class_type: 18670 case DW_TAG_interface_type: 18671 case DW_TAG_enumeration_type: 18672 case DW_TAG_structure_type: 18673 case DW_TAG_subrange_type: 18674 case DW_TAG_typedef: 18675 case DW_TAG_union_type: 18676 return 1; 18677 default: 18678 return 0; 18679 } 18680 } 18681 18682 /* Load all DIEs that are interesting for partial symbols into memory. */ 18683 18684 static struct partial_die_info * 18685 load_partial_dies (const struct die_reader_specs *reader, 18686 const gdb_byte *info_ptr, int building_psymtab) 18687 { 18688 struct dwarf2_cu *cu = reader->cu; 18689 struct objfile *objfile = cu->per_objfile->objfile; 18690 struct partial_die_info *parent_die, *last_die, *first_die = NULL; 18691 unsigned int bytes_read; 18692 unsigned int load_all = 0; 18693 int nesting_level = 1; 18694 18695 parent_die = NULL; 18696 last_die = NULL; 18697 18698 gdb_assert (cu->per_cu != NULL); 18699 if (cu->per_cu->load_all_dies) 18700 load_all = 1; 18701 18702 cu->partial_dies 18703 = htab_create_alloc_ex (cu->header.length / 12, 18704 partial_die_hash, 18705 partial_die_eq, 18706 NULL, 18707 &cu->comp_unit_obstack, 18708 hashtab_obstack_allocate, 18709 dummy_obstack_deallocate); 18710 18711 while (1) 18712 { 18713 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read); 18714 18715 /* A NULL abbrev means the end of a series of children. */ 18716 if (abbrev == NULL) 18717 { 18718 if (--nesting_level == 0) 18719 return first_die; 18720 18721 info_ptr += bytes_read; 18722 last_die = parent_die; 18723 parent_die = parent_die->die_parent; 18724 continue; 18725 } 18726 18727 /* Check for template arguments. We never save these; if 18728 they're seen, we just mark the parent, and go on our way. */ 18729 if (parent_die != NULL 18730 && cu->language == language_cplus 18731 && (abbrev->tag == DW_TAG_template_type_param 18732 || abbrev->tag == DW_TAG_template_value_param)) 18733 { 18734 parent_die->has_template_arguments = 1; 18735 18736 if (!load_all) 18737 { 18738 /* We don't need a partial DIE for the template argument. */ 18739 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); 18740 continue; 18741 } 18742 } 18743 18744 /* We only recurse into c++ subprograms looking for template arguments. 18745 Skip their other children. */ 18746 if (!load_all 18747 && cu->language == language_cplus 18748 && parent_die != NULL 18749 && parent_die->tag == DW_TAG_subprogram 18750 && abbrev->tag != DW_TAG_inlined_subroutine) 18751 { 18752 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); 18753 continue; 18754 } 18755 18756 /* Check whether this DIE is interesting enough to save. Normally 18757 we would not be interested in members here, but there may be 18758 later variables referencing them via DW_AT_specification (for 18759 static members). */ 18760 if (!load_all 18761 && !is_type_tag_for_partial (abbrev->tag) 18762 && abbrev->tag != DW_TAG_constant 18763 && abbrev->tag != DW_TAG_enumerator 18764 && abbrev->tag != DW_TAG_subprogram 18765 && abbrev->tag != DW_TAG_inlined_subroutine 18766 && abbrev->tag != DW_TAG_lexical_block 18767 && abbrev->tag != DW_TAG_variable 18768 && abbrev->tag != DW_TAG_namespace 18769 && abbrev->tag != DW_TAG_module 18770 && abbrev->tag != DW_TAG_member 18771 && abbrev->tag != DW_TAG_imported_unit 18772 && abbrev->tag != DW_TAG_imported_declaration) 18773 { 18774 /* Otherwise we skip to the next sibling, if any. */ 18775 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); 18776 continue; 18777 } 18778 18779 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer), 18780 abbrev); 18781 18782 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read); 18783 18784 /* This two-pass algorithm for processing partial symbols has a 18785 high cost in cache pressure. Thus, handle some simple cases 18786 here which cover the majority of C partial symbols. DIEs 18787 which neither have specification tags in them, nor could have 18788 specification tags elsewhere pointing at them, can simply be 18789 processed and discarded. 18790 18791 This segment is also optional; scan_partial_symbols and 18792 add_partial_symbol will handle these DIEs if we chain 18793 them in normally. When compilers which do not emit large 18794 quantities of duplicate debug information are more common, 18795 this code can probably be removed. */ 18796 18797 /* Any complete simple types at the top level (pretty much all 18798 of them, for a language without namespaces), can be processed 18799 directly. */ 18800 if (parent_die == NULL 18801 && pdi.has_specification == 0 18802 && pdi.is_declaration == 0 18803 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children) 18804 || pdi.tag == DW_TAG_base_type 18805 || pdi.tag == DW_TAG_subrange_type)) 18806 { 18807 if (building_psymtab && pdi.raw_name != NULL) 18808 add_partial_symbol (&pdi, cu); 18809 18810 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr); 18811 continue; 18812 } 18813 18814 /* The exception for DW_TAG_typedef with has_children above is 18815 a workaround of GCC PR debug/47510. In the case of this complaint 18816 type_name_or_error will error on such types later. 18817 18818 GDB skipped children of DW_TAG_typedef by the shortcut above and then 18819 it could not find the child DIEs referenced later, this is checked 18820 above. In correct DWARF DW_TAG_typedef should have no children. */ 18821 18822 if (pdi.tag == DW_TAG_typedef && pdi.has_children) 18823 complaint (_("DW_TAG_typedef has childen - GCC PR debug/47510 bug " 18824 "- DIE at %s [in module %s]"), 18825 sect_offset_str (pdi.sect_off), objfile_name (objfile)); 18826 18827 /* If we're at the second level, and we're an enumerator, and 18828 our parent has no specification (meaning possibly lives in a 18829 namespace elsewhere), then we can add the partial symbol now 18830 instead of queueing it. */ 18831 if (pdi.tag == DW_TAG_enumerator 18832 && parent_die != NULL 18833 && parent_die->die_parent == NULL 18834 && parent_die->tag == DW_TAG_enumeration_type 18835 && parent_die->has_specification == 0) 18836 { 18837 if (pdi.raw_name == NULL) 18838 complaint (_("malformed enumerator DIE ignored")); 18839 else if (building_psymtab) 18840 add_partial_symbol (&pdi, cu); 18841 18842 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr); 18843 continue; 18844 } 18845 18846 struct partial_die_info *part_die 18847 = new (&cu->comp_unit_obstack) partial_die_info (pdi); 18848 18849 /* We'll save this DIE so link it in. */ 18850 part_die->die_parent = parent_die; 18851 part_die->die_sibling = NULL; 18852 part_die->die_child = NULL; 18853 18854 if (last_die && last_die == parent_die) 18855 last_die->die_child = part_die; 18856 else if (last_die) 18857 last_die->die_sibling = part_die; 18858 18859 last_die = part_die; 18860 18861 if (first_die == NULL) 18862 first_die = part_die; 18863 18864 /* Maybe add the DIE to the hash table. Not all DIEs that we 18865 find interesting need to be in the hash table, because we 18866 also have the parent/sibling/child chains; only those that we 18867 might refer to by offset later during partial symbol reading. 18868 18869 For now this means things that might have be the target of a 18870 DW_AT_specification, DW_AT_abstract_origin, or 18871 DW_AT_extension. DW_AT_extension will refer only to 18872 namespaces; DW_AT_abstract_origin refers to functions (and 18873 many things under the function DIE, but we do not recurse 18874 into function DIEs during partial symbol reading) and 18875 possibly variables as well; DW_AT_specification refers to 18876 declarations. Declarations ought to have the DW_AT_declaration 18877 flag. It happens that GCC forgets to put it in sometimes, but 18878 only for functions, not for types. 18879 18880 Adding more things than necessary to the hash table is harmless 18881 except for the performance cost. Adding too few will result in 18882 wasted time in find_partial_die, when we reread the compilation 18883 unit with load_all_dies set. */ 18884 18885 if (load_all 18886 || abbrev->tag == DW_TAG_constant 18887 || abbrev->tag == DW_TAG_subprogram 18888 || abbrev->tag == DW_TAG_variable 18889 || abbrev->tag == DW_TAG_namespace 18890 || part_die->is_declaration) 18891 { 18892 void **slot; 18893 18894 slot = htab_find_slot_with_hash (cu->partial_dies, part_die, 18895 to_underlying (part_die->sect_off), 18896 INSERT); 18897 *slot = part_die; 18898 } 18899 18900 /* For some DIEs we want to follow their children (if any). For C 18901 we have no reason to follow the children of structures; for other 18902 languages we have to, so that we can get at method physnames 18903 to infer fully qualified class names, for DW_AT_specification, 18904 and for C++ template arguments. For C++, we also look one level 18905 inside functions to find template arguments (if the name of the 18906 function does not already contain the template arguments). 18907 18908 For Ada and Fortran, we need to scan the children of subprograms 18909 and lexical blocks as well because these languages allow the 18910 definition of nested entities that could be interesting for the 18911 debugger, such as nested subprograms for instance. */ 18912 if (last_die->has_children 18913 && (load_all 18914 || last_die->tag == DW_TAG_namespace 18915 || last_die->tag == DW_TAG_module 18916 || last_die->tag == DW_TAG_enumeration_type 18917 || (cu->language == language_cplus 18918 && last_die->tag == DW_TAG_subprogram 18919 && (last_die->raw_name == NULL 18920 || strchr (last_die->raw_name, '<') == NULL)) 18921 || (cu->language != language_c 18922 && (last_die->tag == DW_TAG_class_type 18923 || last_die->tag == DW_TAG_interface_type 18924 || last_die->tag == DW_TAG_structure_type 18925 || last_die->tag == DW_TAG_union_type)) 18926 || ((cu->language == language_ada 18927 || cu->language == language_fortran) 18928 && (last_die->tag == DW_TAG_subprogram 18929 || last_die->tag == DW_TAG_lexical_block)))) 18930 { 18931 nesting_level++; 18932 parent_die = last_die; 18933 continue; 18934 } 18935 18936 /* Otherwise we skip to the next sibling, if any. */ 18937 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr); 18938 18939 /* Back to the top, do it again. */ 18940 } 18941 } 18942 18943 partial_die_info::partial_die_info (sect_offset sect_off_, 18944 struct abbrev_info *abbrev) 18945 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children) 18946 { 18947 } 18948 18949 /* See class definition. */ 18950 18951 const char * 18952 partial_die_info::name (dwarf2_cu *cu) 18953 { 18954 if (!canonical_name && raw_name != nullptr) 18955 { 18956 struct objfile *objfile = cu->per_objfile->objfile; 18957 raw_name = dwarf2_canonicalize_name (raw_name, cu, objfile); 18958 canonical_name = 1; 18959 } 18960 18961 return raw_name; 18962 } 18963 18964 /* Read a minimal amount of information into the minimal die structure. 18965 INFO_PTR should point just after the initial uleb128 of a DIE. */ 18966 18967 const gdb_byte * 18968 partial_die_info::read (const struct die_reader_specs *reader, 18969 const struct abbrev_info &abbrev, const gdb_byte *info_ptr) 18970 { 18971 struct dwarf2_cu *cu = reader->cu; 18972 dwarf2_per_objfile *per_objfile = cu->per_objfile; 18973 unsigned int i; 18974 int has_low_pc_attr = 0; 18975 int has_high_pc_attr = 0; 18976 int high_pc_relative = 0; 18977 18978 for (i = 0; i < abbrev.num_attrs; ++i) 18979 { 18980 attribute attr; 18981 bool need_reprocess; 18982 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], 18983 info_ptr, &need_reprocess); 18984 /* String and address offsets that need to do the reprocessing have 18985 already been read at this point, so there is no need to wait until 18986 the loop terminates to do the reprocessing. */ 18987 if (need_reprocess) 18988 read_attribute_reprocess (reader, &attr, tag); 18989 /* Store the data if it is of an attribute we want to keep in a 18990 partial symbol table. */ 18991 switch (attr.name) 18992 { 18993 case DW_AT_name: 18994 switch (tag) 18995 { 18996 case DW_TAG_compile_unit: 18997 case DW_TAG_partial_unit: 18998 case DW_TAG_type_unit: 18999 /* Compilation units have a DW_AT_name that is a filename, not 19000 a source language identifier. */ 19001 case DW_TAG_enumeration_type: 19002 case DW_TAG_enumerator: 19003 /* These tags always have simple identifiers already; no need 19004 to canonicalize them. */ 19005 canonical_name = 1; 19006 raw_name = DW_STRING (&attr); 19007 break; 19008 default: 19009 canonical_name = 0; 19010 raw_name = DW_STRING (&attr); 19011 break; 19012 } 19013 break; 19014 case DW_AT_linkage_name: 19015 case DW_AT_MIPS_linkage_name: 19016 /* Note that both forms of linkage name might appear. We 19017 assume they will be the same, and we only store the last 19018 one we see. */ 19019 linkage_name = attr.value_as_string (); 19020 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these. 19021 See https://github.com/rust-lang/rust/issues/32925. */ 19022 if (cu->language == language_rust && linkage_name != NULL 19023 && strchr (linkage_name, '{') != NULL) 19024 linkage_name = NULL; 19025 break; 19026 case DW_AT_low_pc: 19027 has_low_pc_attr = 1; 19028 lowpc = attr.value_as_address (); 19029 break; 19030 case DW_AT_high_pc: 19031 has_high_pc_attr = 1; 19032 highpc = attr.value_as_address (); 19033 if (cu->header.version >= 4 && attr.form_is_constant ()) 19034 high_pc_relative = 1; 19035 break; 19036 case DW_AT_location: 19037 /* Support the .debug_loc offsets. */ 19038 if (attr.form_is_block ()) 19039 { 19040 d.locdesc = DW_BLOCK (&attr); 19041 } 19042 else if (attr.form_is_section_offset ()) 19043 { 19044 dwarf2_complex_location_expr_complaint (); 19045 } 19046 else 19047 { 19048 dwarf2_invalid_attrib_class_complaint ("DW_AT_location", 19049 "partial symbol information"); 19050 } 19051 break; 19052 case DW_AT_external: 19053 is_external = DW_UNSND (&attr); 19054 break; 19055 case DW_AT_declaration: 19056 is_declaration = DW_UNSND (&attr); 19057 break; 19058 case DW_AT_type: 19059 has_type = 1; 19060 break; 19061 case DW_AT_abstract_origin: 19062 case DW_AT_specification: 19063 case DW_AT_extension: 19064 has_specification = 1; 19065 spec_offset = attr.get_ref_die_offset (); 19066 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt 19067 || cu->per_cu->is_dwz); 19068 break; 19069 case DW_AT_sibling: 19070 /* Ignore absolute siblings, they might point outside of 19071 the current compile unit. */ 19072 if (attr.form == DW_FORM_ref_addr) 19073 complaint (_("ignoring absolute DW_AT_sibling")); 19074 else 19075 { 19076 const gdb_byte *buffer = reader->buffer; 19077 sect_offset off = attr.get_ref_die_offset (); 19078 const gdb_byte *sibling_ptr = buffer + to_underlying (off); 19079 19080 if (sibling_ptr < info_ptr) 19081 complaint (_("DW_AT_sibling points backwards")); 19082 else if (sibling_ptr > reader->buffer_end) 19083 reader->die_section->overflow_complaint (); 19084 else 19085 sibling = sibling_ptr; 19086 } 19087 break; 19088 case DW_AT_byte_size: 19089 has_byte_size = 1; 19090 break; 19091 case DW_AT_const_value: 19092 has_const_value = 1; 19093 break; 19094 case DW_AT_calling_convention: 19095 /* DWARF doesn't provide a way to identify a program's source-level 19096 entry point. DW_AT_calling_convention attributes are only meant 19097 to describe functions' calling conventions. 19098 19099 However, because it's a necessary piece of information in 19100 Fortran, and before DWARF 4 DW_CC_program was the only 19101 piece of debugging information whose definition refers to 19102 a 'main program' at all, several compilers marked Fortran 19103 main programs with DW_CC_program --- even when those 19104 functions use the standard calling conventions. 19105 19106 Although DWARF now specifies a way to provide this 19107 information, we support this practice for backward 19108 compatibility. */ 19109 if (DW_UNSND (&attr) == DW_CC_program 19110 && cu->language == language_fortran) 19111 main_subprogram = 1; 19112 break; 19113 case DW_AT_inline: 19114 if (DW_UNSND (&attr) == DW_INL_inlined 19115 || DW_UNSND (&attr) == DW_INL_declared_inlined) 19116 may_be_inlined = 1; 19117 break; 19118 19119 case DW_AT_import: 19120 if (tag == DW_TAG_imported_unit) 19121 { 19122 d.sect_off = attr.get_ref_die_offset (); 19123 is_dwz = (attr.form == DW_FORM_GNU_ref_alt 19124 || cu->per_cu->is_dwz); 19125 } 19126 break; 19127 19128 case DW_AT_main_subprogram: 19129 main_subprogram = DW_UNSND (&attr); 19130 break; 19131 19132 case DW_AT_ranges: 19133 { 19134 /* DW_AT_rnglists_base does not apply to DIEs from the DWO 19135 skeleton. We take advantage of the fact the DW_AT_ranges 19136 does not appear in DW_TAG_compile_unit of DWO files. 19137 19138 Attributes of the form DW_FORM_rnglistx have already had 19139 their value changed by read_rnglist_index and already 19140 include DW_AT_rnglists_base, so don't need to add the ranges 19141 base, either. */ 19142 int need_ranges_base = (tag != DW_TAG_compile_unit 19143 && attr.form != DW_FORM_rnglistx); 19144 unsigned int ranges_offset = (DW_UNSND (&attr) 19145 + (need_ranges_base 19146 ? cu->ranges_base 19147 : 0)); 19148 19149 /* Value of the DW_AT_ranges attribute is the offset in the 19150 .debug_ranges section. */ 19151 if (dwarf2_ranges_read (ranges_offset, &lowpc, &highpc, cu, 19152 nullptr, tag)) 19153 has_pc_info = 1; 19154 } 19155 break; 19156 19157 default: 19158 break; 19159 } 19160 } 19161 19162 /* For Ada, if both the name and the linkage name appear, we prefer 19163 the latter. This lets "catch exception" work better, regardless 19164 of the order in which the name and linkage name were emitted. 19165 Really, though, this is just a workaround for the fact that gdb 19166 doesn't store both the name and the linkage name. */ 19167 if (cu->language == language_ada && linkage_name != nullptr) 19168 raw_name = linkage_name; 19169 19170 if (high_pc_relative) 19171 highpc += lowpc; 19172 19173 if (has_low_pc_attr && has_high_pc_attr) 19174 { 19175 /* When using the GNU linker, .gnu.linkonce. sections are used to 19176 eliminate duplicate copies of functions and vtables and such. 19177 The linker will arbitrarily choose one and discard the others. 19178 The AT_*_pc values for such functions refer to local labels in 19179 these sections. If the section from that file was discarded, the 19180 labels are not in the output, so the relocs get a value of 0. 19181 If this is a discarded function, mark the pc bounds as invalid, 19182 so that GDB will ignore it. */ 19183 if (lowpc == 0 && !per_objfile->per_bfd->has_section_at_zero) 19184 { 19185 struct objfile *objfile = per_objfile->objfile; 19186 struct gdbarch *gdbarch = objfile->arch (); 19187 19188 complaint (_("DW_AT_low_pc %s is zero " 19189 "for DIE at %s [in module %s]"), 19190 paddress (gdbarch, lowpc), 19191 sect_offset_str (sect_off), 19192 objfile_name (objfile)); 19193 } 19194 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */ 19195 else if (lowpc >= highpc) 19196 { 19197 struct objfile *objfile = per_objfile->objfile; 19198 struct gdbarch *gdbarch = objfile->arch (); 19199 19200 complaint (_("DW_AT_low_pc %s is not < DW_AT_high_pc %s " 19201 "for DIE at %s [in module %s]"), 19202 paddress (gdbarch, lowpc), 19203 paddress (gdbarch, highpc), 19204 sect_offset_str (sect_off), 19205 objfile_name (objfile)); 19206 } 19207 else 19208 has_pc_info = 1; 19209 } 19210 19211 return info_ptr; 19212 } 19213 19214 /* Find a cached partial DIE at OFFSET in CU. */ 19215 19216 struct partial_die_info * 19217 dwarf2_cu::find_partial_die (sect_offset sect_off) 19218 { 19219 struct partial_die_info *lookup_die = NULL; 19220 struct partial_die_info part_die (sect_off); 19221 19222 lookup_die = ((struct partial_die_info *) 19223 htab_find_with_hash (partial_dies, &part_die, 19224 to_underlying (sect_off))); 19225 19226 return lookup_die; 19227 } 19228 19229 /* Find a partial DIE at OFFSET, which may or may not be in CU, 19230 except in the case of .debug_types DIEs which do not reference 19231 outside their CU (they do however referencing other types via 19232 DW_FORM_ref_sig8). */ 19233 19234 static const struct cu_partial_die_info 19235 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu) 19236 { 19237 dwarf2_per_objfile *per_objfile = cu->per_objfile; 19238 struct objfile *objfile = per_objfile->objfile; 19239 struct partial_die_info *pd = NULL; 19240 19241 if (offset_in_dwz == cu->per_cu->is_dwz 19242 && cu->header.offset_in_cu_p (sect_off)) 19243 { 19244 pd = cu->find_partial_die (sect_off); 19245 if (pd != NULL) 19246 return { cu, pd }; 19247 /* We missed recording what we needed. 19248 Load all dies and try again. */ 19249 } 19250 else 19251 { 19252 /* TUs don't reference other CUs/TUs (except via type signatures). */ 19253 if (cu->per_cu->is_debug_types) 19254 { 19255 error (_("Dwarf Error: Type Unit at offset %s contains" 19256 " external reference to offset %s [in module %s].\n"), 19257 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off), 19258 bfd_get_filename (objfile->obfd)); 19259 } 19260 dwarf2_per_cu_data *per_cu 19261 = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz, 19262 per_objfile); 19263 19264 cu = per_objfile->get_cu (per_cu); 19265 if (cu == NULL || cu->partial_dies == NULL) 19266 load_partial_comp_unit (per_cu, per_objfile, nullptr); 19267 19268 cu = per_objfile->get_cu (per_cu); 19269 19270 cu->last_used = 0; 19271 pd = cu->find_partial_die (sect_off); 19272 } 19273 19274 /* If we didn't find it, and not all dies have been loaded, 19275 load them all and try again. */ 19276 19277 if (pd == NULL && cu->per_cu->load_all_dies == 0) 19278 { 19279 cu->per_cu->load_all_dies = 1; 19280 19281 /* This is nasty. When we reread the DIEs, somewhere up the call chain 19282 THIS_CU->cu may already be in use. So we can't just free it and 19283 replace its DIEs with the ones we read in. Instead, we leave those 19284 DIEs alone (which can still be in use, e.g. in scan_partial_symbols), 19285 and clobber THIS_CU->cu->partial_dies with the hash table for the new 19286 set. */ 19287 load_partial_comp_unit (cu->per_cu, per_objfile, cu); 19288 19289 pd = cu->find_partial_die (sect_off); 19290 } 19291 19292 if (pd == NULL) 19293 error (_("Dwarf Error: Cannot not find DIE at %s [from module %s]\n"), 19294 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd)); 19295 return { cu, pd }; 19296 } 19297 19298 /* See if we can figure out if the class lives in a namespace. We do 19299 this by looking for a member function; its demangled name will 19300 contain namespace info, if there is any. */ 19301 19302 static void 19303 guess_partial_die_structure_name (struct partial_die_info *struct_pdi, 19304 struct dwarf2_cu *cu) 19305 { 19306 /* NOTE: carlton/2003-10-07: Getting the info this way changes 19307 what template types look like, because the demangler 19308 frequently doesn't give the same name as the debug info. We 19309 could fix this by only using the demangled name to get the 19310 prefix (but see comment in read_structure_type). */ 19311 19312 struct partial_die_info *real_pdi; 19313 struct partial_die_info *child_pdi; 19314 19315 /* If this DIE (this DIE's specification, if any) has a parent, then 19316 we should not do this. We'll prepend the parent's fully qualified 19317 name when we create the partial symbol. */ 19318 19319 real_pdi = struct_pdi; 19320 while (real_pdi->has_specification) 19321 { 19322 auto res = find_partial_die (real_pdi->spec_offset, 19323 real_pdi->spec_is_dwz, cu); 19324 real_pdi = res.pdi; 19325 cu = res.cu; 19326 } 19327 19328 if (real_pdi->die_parent != NULL) 19329 return; 19330 19331 for (child_pdi = struct_pdi->die_child; 19332 child_pdi != NULL; 19333 child_pdi = child_pdi->die_sibling) 19334 { 19335 if (child_pdi->tag == DW_TAG_subprogram 19336 && child_pdi->linkage_name != NULL) 19337 { 19338 gdb::unique_xmalloc_ptr<char> actual_class_name 19339 (cu->language_defn->class_name_from_physname 19340 (child_pdi->linkage_name)); 19341 if (actual_class_name != NULL) 19342 { 19343 struct objfile *objfile = cu->per_objfile->objfile; 19344 struct_pdi->raw_name = objfile->intern (actual_class_name.get ()); 19345 struct_pdi->canonical_name = 1; 19346 } 19347 break; 19348 } 19349 } 19350 } 19351 19352 /* Return true if a DIE with TAG may have the DW_AT_const_value 19353 attribute. */ 19354 19355 static bool 19356 can_have_DW_AT_const_value_p (enum dwarf_tag tag) 19357 { 19358 switch (tag) 19359 { 19360 case DW_TAG_constant: 19361 case DW_TAG_enumerator: 19362 case DW_TAG_formal_parameter: 19363 case DW_TAG_template_value_param: 19364 case DW_TAG_variable: 19365 return true; 19366 } 19367 19368 return false; 19369 } 19370 19371 void 19372 partial_die_info::fixup (struct dwarf2_cu *cu) 19373 { 19374 /* Once we've fixed up a die, there's no point in doing so again. 19375 This also avoids a memory leak if we were to call 19376 guess_partial_die_structure_name multiple times. */ 19377 if (fixup_called) 19378 return; 19379 19380 /* If we found a reference attribute and the DIE has no name, try 19381 to find a name in the referred to DIE. */ 19382 19383 if (raw_name == NULL && has_specification) 19384 { 19385 struct partial_die_info *spec_die; 19386 19387 auto res = find_partial_die (spec_offset, spec_is_dwz, cu); 19388 spec_die = res.pdi; 19389 cu = res.cu; 19390 19391 spec_die->fixup (cu); 19392 19393 if (spec_die->raw_name) 19394 { 19395 raw_name = spec_die->raw_name; 19396 canonical_name = spec_die->canonical_name; 19397 19398 /* Copy DW_AT_external attribute if it is set. */ 19399 if (spec_die->is_external) 19400 is_external = spec_die->is_external; 19401 } 19402 } 19403 19404 if (!has_const_value && has_specification 19405 && can_have_DW_AT_const_value_p (tag)) 19406 { 19407 struct partial_die_info *spec_die; 19408 19409 auto res = find_partial_die (spec_offset, spec_is_dwz, cu); 19410 spec_die = res.pdi; 19411 cu = res.cu; 19412 19413 spec_die->fixup (cu); 19414 19415 if (spec_die->has_const_value) 19416 { 19417 /* Copy DW_AT_const_value attribute if it is set. */ 19418 has_const_value = spec_die->has_const_value; 19419 } 19420 } 19421 19422 /* Set default names for some unnamed DIEs. */ 19423 19424 if (raw_name == NULL && tag == DW_TAG_namespace) 19425 { 19426 raw_name = CP_ANONYMOUS_NAMESPACE_STR; 19427 canonical_name = 1; 19428 } 19429 19430 /* If there is no parent die to provide a namespace, and there are 19431 children, see if we can determine the namespace from their linkage 19432 name. */ 19433 if (cu->language == language_cplus 19434 && !cu->per_objfile->per_bfd->types.empty () 19435 && die_parent == NULL 19436 && has_children 19437 && (tag == DW_TAG_class_type 19438 || tag == DW_TAG_structure_type 19439 || tag == DW_TAG_union_type)) 19440 guess_partial_die_structure_name (this, cu); 19441 19442 /* GCC might emit a nameless struct or union that has a linkage 19443 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ 19444 if (raw_name == NULL 19445 && (tag == DW_TAG_class_type 19446 || tag == DW_TAG_interface_type 19447 || tag == DW_TAG_structure_type 19448 || tag == DW_TAG_union_type) 19449 && linkage_name != NULL) 19450 { 19451 gdb::unique_xmalloc_ptr<char> demangled 19452 (gdb_demangle (linkage_name, DMGL_TYPES)); 19453 if (demangled != nullptr) 19454 { 19455 const char *base; 19456 19457 /* Strip any leading namespaces/classes, keep only the base name. 19458 DW_AT_name for named DIEs does not contain the prefixes. */ 19459 base = strrchr (demangled.get (), ':'); 19460 if (base && base > demangled.get () && base[-1] == ':') 19461 base++; 19462 else 19463 base = demangled.get (); 19464 19465 struct objfile *objfile = cu->per_objfile->objfile; 19466 raw_name = objfile->intern (base); 19467 canonical_name = 1; 19468 } 19469 } 19470 19471 fixup_called = 1; 19472 } 19473 19474 /* Read the .debug_loclists or .debug_rnglists header (they are the same format) 19475 contents from the given SECTION in the HEADER. */ 19476 static void 19477 read_loclists_rnglists_header (struct loclists_rnglists_header *header, 19478 struct dwarf2_section_info *section) 19479 { 19480 unsigned int bytes_read; 19481 bfd *abfd = section->get_bfd_owner (); 19482 const gdb_byte *info_ptr = section->buffer; 19483 header->length = read_initial_length (abfd, info_ptr, &bytes_read); 19484 info_ptr += bytes_read; 19485 header->version = read_2_bytes (abfd, info_ptr); 19486 info_ptr += 2; 19487 header->addr_size = read_1_byte (abfd, info_ptr); 19488 info_ptr += 1; 19489 header->segment_collector_size = read_1_byte (abfd, info_ptr); 19490 info_ptr += 1; 19491 header->offset_entry_count = read_4_bytes (abfd, info_ptr); 19492 } 19493 19494 /* Return the DW_AT_loclists_base value for the CU. */ 19495 static ULONGEST 19496 lookup_loclist_base (struct dwarf2_cu *cu) 19497 { 19498 /* For the .dwo unit, the loclist_base points to the first offset following 19499 the header. The header consists of the following entities- 19500 1. Unit Length (4 bytes for 32 bit DWARF format, and 12 bytes for the 64 19501 bit format) 19502 2. version (2 bytes) 19503 3. address size (1 byte) 19504 4. segment selector size (1 byte) 19505 5. offset entry count (4 bytes) 19506 These sizes are derived as per the DWARFv5 standard. */ 19507 if (cu->dwo_unit != nullptr) 19508 { 19509 if (cu->header.initial_length_size == 4) 19510 return LOCLIST_HEADER_SIZE32; 19511 return LOCLIST_HEADER_SIZE64; 19512 } 19513 return cu->loclist_base; 19514 } 19515 19516 /* Given a DW_FORM_loclistx value LOCLIST_INDEX, fetch the offset from the 19517 array of offsets in the .debug_loclists section. */ 19518 static CORE_ADDR 19519 read_loclist_index (struct dwarf2_cu *cu, ULONGEST loclist_index) 19520 { 19521 dwarf2_per_objfile *per_objfile = cu->per_objfile; 19522 struct objfile *objfile = per_objfile->objfile; 19523 bfd *abfd = objfile->obfd; 19524 ULONGEST loclist_base = lookup_loclist_base (cu); 19525 struct dwarf2_section_info *section = cu_debug_loc_section (cu); 19526 19527 section->read (objfile); 19528 if (section->buffer == NULL) 19529 complaint (_("DW_FORM_loclistx used without .debug_loclists " 19530 "section [in module %s]"), objfile_name (objfile)); 19531 struct loclists_rnglists_header header; 19532 read_loclists_rnglists_header (&header, section); 19533 if (loclist_index >= header.offset_entry_count) 19534 complaint (_("DW_FORM_loclistx pointing outside of " 19535 ".debug_loclists offset array [in module %s]"), 19536 objfile_name (objfile)); 19537 if (loclist_base + loclist_index * cu->header.offset_size 19538 >= section->size) 19539 complaint (_("DW_FORM_loclistx pointing outside of " 19540 ".debug_loclists section [in module %s]"), 19541 objfile_name (objfile)); 19542 const gdb_byte *info_ptr 19543 = section->buffer + loclist_base + loclist_index * cu->header.offset_size; 19544 19545 if (cu->header.offset_size == 4) 19546 return bfd_get_32 (abfd, info_ptr) + loclist_base; 19547 else 19548 return bfd_get_64 (abfd, info_ptr) + loclist_base; 19549 } 19550 19551 /* Given a DW_FORM_rnglistx value RNGLIST_INDEX, fetch the offset from the 19552 array of offsets in the .debug_rnglists section. */ 19553 static CORE_ADDR 19554 read_rnglist_index (struct dwarf2_cu *cu, ULONGEST rnglist_index, 19555 dwarf_tag tag) 19556 { 19557 struct dwarf2_per_objfile *dwarf2_per_objfile = cu->per_objfile; 19558 struct objfile *objfile = dwarf2_per_objfile->objfile; 19559 bfd *abfd = objfile->obfd; 19560 ULONGEST rnglist_header_size = 19561 (cu->header.initial_length_size == 4 ? RNGLIST_HEADER_SIZE32 19562 : RNGLIST_HEADER_SIZE64); 19563 ULONGEST rnglist_base = 19564 (cu->dwo_unit != nullptr) ? rnglist_header_size : cu->ranges_base; 19565 ULONGEST start_offset = 19566 rnglist_base + rnglist_index * cu->header.offset_size; 19567 19568 /* Get rnglists section. */ 19569 struct dwarf2_section_info *section = cu_debug_rnglists_section (cu, tag); 19570 19571 /* Read the rnglists section content. */ 19572 section->read (objfile); 19573 if (section->buffer == nullptr) 19574 error (_("DW_FORM_rnglistx used without .debug_rnglists section " 19575 "[in module %s]"), 19576 objfile_name (objfile)); 19577 19578 /* Verify the rnglist index is valid. */ 19579 struct loclists_rnglists_header header; 19580 read_loclists_rnglists_header (&header, section); 19581 if (rnglist_index >= header.offset_entry_count) 19582 error (_("DW_FORM_rnglistx index pointing outside of " 19583 ".debug_rnglists offset array [in module %s]"), 19584 objfile_name (objfile)); 19585 19586 /* Validate that the offset is within the section's range. */ 19587 if (start_offset >= section->size) 19588 error (_("DW_FORM_rnglistx pointing outside of " 19589 ".debug_rnglists section [in module %s]"), 19590 objfile_name (objfile)); 19591 19592 /* Validate that reading won't go beyond the end of the section. */ 19593 if (start_offset + cu->header.offset_size > rnglist_base + section->size) 19594 error (_("Reading DW_FORM_rnglistx index beyond end of" 19595 ".debug_rnglists section [in module %s]"), 19596 objfile_name (objfile)); 19597 19598 const gdb_byte *info_ptr = section->buffer + start_offset; 19599 19600 if (cu->header.offset_size == 4) 19601 return read_4_bytes (abfd, info_ptr) + rnglist_base; 19602 else 19603 return read_8_bytes (abfd, info_ptr) + rnglist_base; 19604 } 19605 19606 /* Process the attributes that had to be skipped in the first round. These 19607 attributes are the ones that need str_offsets_base or addr_base attributes. 19608 They could not have been processed in the first round, because at the time 19609 the values of str_offsets_base or addr_base may not have been known. */ 19610 static void 19611 read_attribute_reprocess (const struct die_reader_specs *reader, 19612 struct attribute *attr, dwarf_tag tag) 19613 { 19614 struct dwarf2_cu *cu = reader->cu; 19615 switch (attr->form) 19616 { 19617 case DW_FORM_addrx: 19618 case DW_FORM_GNU_addr_index: 19619 DW_ADDR (attr) = read_addr_index (cu, DW_UNSND (attr)); 19620 break; 19621 case DW_FORM_loclistx: 19622 DW_UNSND (attr) = read_loclist_index (cu, DW_UNSND (attr)); 19623 break; 19624 case DW_FORM_rnglistx: 19625 DW_UNSND (attr) = read_rnglist_index (cu, DW_UNSND (attr), tag); 19626 break; 19627 case DW_FORM_strx: 19628 case DW_FORM_strx1: 19629 case DW_FORM_strx2: 19630 case DW_FORM_strx3: 19631 case DW_FORM_strx4: 19632 case DW_FORM_GNU_str_index: 19633 { 19634 unsigned int str_index = DW_UNSND (attr); 19635 if (reader->dwo_file != NULL) 19636 { 19637 DW_STRING (attr) = read_dwo_str_index (reader, str_index); 19638 DW_STRING_IS_CANONICAL (attr) = 0; 19639 } 19640 else 19641 { 19642 DW_STRING (attr) = read_stub_str_index (cu, str_index); 19643 DW_STRING_IS_CANONICAL (attr) = 0; 19644 } 19645 break; 19646 } 19647 default: 19648 gdb_assert_not_reached (_("Unexpected DWARF form.")); 19649 } 19650 } 19651 19652 /* Read an attribute value described by an attribute form. */ 19653 19654 static const gdb_byte * 19655 read_attribute_value (const struct die_reader_specs *reader, 19656 struct attribute *attr, unsigned form, 19657 LONGEST implicit_const, const gdb_byte *info_ptr, 19658 bool *need_reprocess) 19659 { 19660 struct dwarf2_cu *cu = reader->cu; 19661 dwarf2_per_objfile *per_objfile = cu->per_objfile; 19662 struct objfile *objfile = per_objfile->objfile; 19663 bfd *abfd = reader->abfd; 19664 struct comp_unit_head *cu_header = &cu->header; 19665 unsigned int bytes_read; 19666 struct dwarf_block *blk; 19667 *need_reprocess = false; 19668 19669 attr->form = (enum dwarf_form) form; 19670 switch (form) 19671 { 19672 case DW_FORM_ref_addr: 19673 if (cu->header.version == 2) 19674 DW_UNSND (attr) = cu->header.read_address (abfd, info_ptr, 19675 &bytes_read); 19676 else 19677 DW_UNSND (attr) = cu->header.read_offset (abfd, info_ptr, 19678 &bytes_read); 19679 info_ptr += bytes_read; 19680 break; 19681 case DW_FORM_GNU_ref_alt: 19682 DW_UNSND (attr) = cu->header.read_offset (abfd, info_ptr, &bytes_read); 19683 info_ptr += bytes_read; 19684 break; 19685 case DW_FORM_addr: 19686 { 19687 struct gdbarch *gdbarch = objfile->arch (); 19688 DW_ADDR (attr) = cu->header.read_address (abfd, info_ptr, &bytes_read); 19689 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr)); 19690 info_ptr += bytes_read; 19691 } 19692 break; 19693 case DW_FORM_block2: 19694 blk = dwarf_alloc_block (cu); 19695 blk->size = read_2_bytes (abfd, info_ptr); 19696 info_ptr += 2; 19697 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 19698 info_ptr += blk->size; 19699 DW_BLOCK (attr) = blk; 19700 break; 19701 case DW_FORM_block4: 19702 blk = dwarf_alloc_block (cu); 19703 blk->size = read_4_bytes (abfd, info_ptr); 19704 info_ptr += 4; 19705 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 19706 info_ptr += blk->size; 19707 DW_BLOCK (attr) = blk; 19708 break; 19709 case DW_FORM_data2: 19710 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr); 19711 info_ptr += 2; 19712 break; 19713 case DW_FORM_data4: 19714 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr); 19715 info_ptr += 4; 19716 break; 19717 case DW_FORM_data8: 19718 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr); 19719 info_ptr += 8; 19720 break; 19721 case DW_FORM_data16: 19722 blk = dwarf_alloc_block (cu); 19723 blk->size = 16; 19724 blk->data = read_n_bytes (abfd, info_ptr, 16); 19725 info_ptr += 16; 19726 DW_BLOCK (attr) = blk; 19727 break; 19728 case DW_FORM_sec_offset: 19729 DW_UNSND (attr) = cu->header.read_offset (abfd, info_ptr, &bytes_read); 19730 info_ptr += bytes_read; 19731 break; 19732 case DW_FORM_loclistx: 19733 { 19734 *need_reprocess = true; 19735 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 19736 info_ptr += bytes_read; 19737 } 19738 break; 19739 case DW_FORM_string: 19740 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read); 19741 DW_STRING_IS_CANONICAL (attr) = 0; 19742 info_ptr += bytes_read; 19743 break; 19744 case DW_FORM_strp: 19745 if (!cu->per_cu->is_dwz) 19746 { 19747 DW_STRING (attr) = read_indirect_string (per_objfile, 19748 abfd, info_ptr, cu_header, 19749 &bytes_read); 19750 DW_STRING_IS_CANONICAL (attr) = 0; 19751 info_ptr += bytes_read; 19752 break; 19753 } 19754 /* FALLTHROUGH */ 19755 case DW_FORM_line_strp: 19756 if (!cu->per_cu->is_dwz) 19757 { 19758 DW_STRING (attr) = per_objfile->read_line_string (info_ptr, cu_header, 19759 &bytes_read); 19760 DW_STRING_IS_CANONICAL (attr) = 0; 19761 info_ptr += bytes_read; 19762 break; 19763 } 19764 /* FALLTHROUGH */ 19765 case DW_FORM_GNU_strp_alt: 19766 { 19767 dwz_file *dwz = dwarf2_get_dwz_file (per_objfile->per_bfd); 19768 LONGEST str_offset = cu_header->read_offset (abfd, info_ptr, 19769 &bytes_read); 19770 19771 DW_STRING (attr) = dwz->read_string (objfile, str_offset); 19772 DW_STRING_IS_CANONICAL (attr) = 0; 19773 info_ptr += bytes_read; 19774 } 19775 break; 19776 case DW_FORM_exprloc: 19777 case DW_FORM_block: 19778 blk = dwarf_alloc_block (cu); 19779 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 19780 info_ptr += bytes_read; 19781 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 19782 info_ptr += blk->size; 19783 DW_BLOCK (attr) = blk; 19784 break; 19785 case DW_FORM_block1: 19786 blk = dwarf_alloc_block (cu); 19787 blk->size = read_1_byte (abfd, info_ptr); 19788 info_ptr += 1; 19789 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 19790 info_ptr += blk->size; 19791 DW_BLOCK (attr) = blk; 19792 break; 19793 case DW_FORM_data1: 19794 DW_UNSND (attr) = read_1_byte (abfd, info_ptr); 19795 info_ptr += 1; 19796 break; 19797 case DW_FORM_flag: 19798 DW_UNSND (attr) = read_1_byte (abfd, info_ptr); 19799 info_ptr += 1; 19800 break; 19801 case DW_FORM_flag_present: 19802 DW_UNSND (attr) = 1; 19803 break; 19804 case DW_FORM_sdata: 19805 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read); 19806 info_ptr += bytes_read; 19807 break; 19808 case DW_FORM_rnglistx: 19809 *need_reprocess = true; 19810 /* FALLTHROUGH */ 19811 case DW_FORM_udata: 19812 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 19813 info_ptr += bytes_read; 19814 break; 19815 case DW_FORM_ref1: 19816 DW_UNSND (attr) = (to_underlying (cu->header.sect_off) 19817 + read_1_byte (abfd, info_ptr)); 19818 info_ptr += 1; 19819 break; 19820 case DW_FORM_ref2: 19821 DW_UNSND (attr) = (to_underlying (cu->header.sect_off) 19822 + read_2_bytes (abfd, info_ptr)); 19823 info_ptr += 2; 19824 break; 19825 case DW_FORM_ref4: 19826 DW_UNSND (attr) = (to_underlying (cu->header.sect_off) 19827 + read_4_bytes (abfd, info_ptr)); 19828 info_ptr += 4; 19829 break; 19830 case DW_FORM_ref8: 19831 DW_UNSND (attr) = (to_underlying (cu->header.sect_off) 19832 + read_8_bytes (abfd, info_ptr)); 19833 info_ptr += 8; 19834 break; 19835 case DW_FORM_ref_sig8: 19836 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr); 19837 info_ptr += 8; 19838 break; 19839 case DW_FORM_ref_udata: 19840 DW_UNSND (attr) = (to_underlying (cu->header.sect_off) 19841 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read)); 19842 info_ptr += bytes_read; 19843 break; 19844 case DW_FORM_indirect: 19845 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 19846 info_ptr += bytes_read; 19847 if (form == DW_FORM_implicit_const) 19848 { 19849 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read); 19850 info_ptr += bytes_read; 19851 } 19852 info_ptr = read_attribute_value (reader, attr, form, implicit_const, 19853 info_ptr, need_reprocess); 19854 break; 19855 case DW_FORM_implicit_const: 19856 DW_SND (attr) = implicit_const; 19857 break; 19858 case DW_FORM_addrx: 19859 case DW_FORM_GNU_addr_index: 19860 *need_reprocess = true; 19861 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 19862 info_ptr += bytes_read; 19863 break; 19864 case DW_FORM_strx: 19865 case DW_FORM_strx1: 19866 case DW_FORM_strx2: 19867 case DW_FORM_strx3: 19868 case DW_FORM_strx4: 19869 case DW_FORM_GNU_str_index: 19870 { 19871 ULONGEST str_index; 19872 if (form == DW_FORM_strx1) 19873 { 19874 str_index = read_1_byte (abfd, info_ptr); 19875 info_ptr += 1; 19876 } 19877 else if (form == DW_FORM_strx2) 19878 { 19879 str_index = read_2_bytes (abfd, info_ptr); 19880 info_ptr += 2; 19881 } 19882 else if (form == DW_FORM_strx3) 19883 { 19884 str_index = read_3_bytes (abfd, info_ptr); 19885 info_ptr += 3; 19886 } 19887 else if (form == DW_FORM_strx4) 19888 { 19889 str_index = read_4_bytes (abfd, info_ptr); 19890 info_ptr += 4; 19891 } 19892 else 19893 { 19894 str_index = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 19895 info_ptr += bytes_read; 19896 } 19897 *need_reprocess = true; 19898 DW_UNSND (attr) = str_index; 19899 } 19900 break; 19901 default: 19902 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"), 19903 dwarf_form_name (form), 19904 bfd_get_filename (abfd)); 19905 } 19906 19907 /* Super hack. */ 19908 if (cu->per_cu->is_dwz && attr->form_is_ref ()) 19909 attr->form = DW_FORM_GNU_ref_alt; 19910 19911 /* We have seen instances where the compiler tried to emit a byte 19912 size attribute of -1 which ended up being encoded as an unsigned 19913 0xffffffff. Although 0xffffffff is technically a valid size value, 19914 an object of this size seems pretty unlikely so we can relatively 19915 safely treat these cases as if the size attribute was invalid and 19916 treat them as zero by default. */ 19917 if (attr->name == DW_AT_byte_size 19918 && form == DW_FORM_data4 19919 && DW_UNSND (attr) >= 0xffffffff) 19920 { 19921 complaint 19922 (_("Suspicious DW_AT_byte_size value treated as zero instead of %s"), 19923 hex_string (DW_UNSND (attr))); 19924 DW_UNSND (attr) = 0; 19925 } 19926 19927 return info_ptr; 19928 } 19929 19930 /* Read an attribute described by an abbreviated attribute. */ 19931 19932 static const gdb_byte * 19933 read_attribute (const struct die_reader_specs *reader, 19934 struct attribute *attr, struct attr_abbrev *abbrev, 19935 const gdb_byte *info_ptr, bool *need_reprocess) 19936 { 19937 attr->name = abbrev->name; 19938 return read_attribute_value (reader, attr, abbrev->form, 19939 abbrev->implicit_const, info_ptr, 19940 need_reprocess); 19941 } 19942 19943 /* Return pointer to string at .debug_str offset STR_OFFSET. */ 19944 19945 static const char * 19946 read_indirect_string_at_offset (dwarf2_per_objfile *per_objfile, 19947 LONGEST str_offset) 19948 { 19949 return per_objfile->per_bfd->str.read_string (per_objfile->objfile, 19950 str_offset, "DW_FORM_strp"); 19951 } 19952 19953 /* Return pointer to string at .debug_str offset as read from BUF. 19954 BUF is assumed to be in a compilation unit described by CU_HEADER. 19955 Return *BYTES_READ_PTR count of bytes read from BUF. */ 19956 19957 static const char * 19958 read_indirect_string (dwarf2_per_objfile *per_objfile, bfd *abfd, 19959 const gdb_byte *buf, 19960 const struct comp_unit_head *cu_header, 19961 unsigned int *bytes_read_ptr) 19962 { 19963 LONGEST str_offset = cu_header->read_offset (abfd, buf, bytes_read_ptr); 19964 19965 return read_indirect_string_at_offset (per_objfile, str_offset); 19966 } 19967 19968 /* See read.h. */ 19969 19970 const char * 19971 dwarf2_per_objfile::read_line_string (const gdb_byte *buf, 19972 const struct comp_unit_head *cu_header, 19973 unsigned int *bytes_read_ptr) 19974 { 19975 bfd *abfd = objfile->obfd; 19976 LONGEST str_offset = cu_header->read_offset (abfd, buf, bytes_read_ptr); 19977 19978 return per_bfd->line_str.read_string (objfile, str_offset, "DW_FORM_line_strp"); 19979 } 19980 19981 /* Given index ADDR_INDEX in .debug_addr, fetch the value. 19982 ADDR_BASE is the DW_AT_addr_base (DW_AT_GNU_addr_base) attribute or zero. 19983 ADDR_SIZE is the size of addresses from the CU header. */ 19984 19985 static CORE_ADDR 19986 read_addr_index_1 (dwarf2_per_objfile *per_objfile, unsigned int addr_index, 19987 gdb::optional<ULONGEST> addr_base, int addr_size) 19988 { 19989 struct objfile *objfile = per_objfile->objfile; 19990 bfd *abfd = objfile->obfd; 19991 const gdb_byte *info_ptr; 19992 ULONGEST addr_base_or_zero = addr_base.has_value () ? *addr_base : 0; 19993 19994 per_objfile->per_bfd->addr.read (objfile); 19995 if (per_objfile->per_bfd->addr.buffer == NULL) 19996 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"), 19997 objfile_name (objfile)); 19998 if (addr_base_or_zero + addr_index * addr_size 19999 >= per_objfile->per_bfd->addr.size) 20000 error (_("DW_FORM_addr_index pointing outside of " 20001 ".debug_addr section [in module %s]"), 20002 objfile_name (objfile)); 20003 info_ptr = (per_objfile->per_bfd->addr.buffer + addr_base_or_zero 20004 + addr_index * addr_size); 20005 if (addr_size == 4) 20006 return bfd_get_32 (abfd, info_ptr); 20007 else 20008 return bfd_get_64 (abfd, info_ptr); 20009 } 20010 20011 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */ 20012 20013 static CORE_ADDR 20014 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index) 20015 { 20016 return read_addr_index_1 (cu->per_objfile, addr_index, 20017 cu->addr_base, cu->header.addr_size); 20018 } 20019 20020 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */ 20021 20022 static CORE_ADDR 20023 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr, 20024 unsigned int *bytes_read) 20025 { 20026 bfd *abfd = cu->per_objfile->objfile->obfd; 20027 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read); 20028 20029 return read_addr_index (cu, addr_index); 20030 } 20031 20032 /* See read.h. */ 20033 20034 CORE_ADDR 20035 dwarf2_read_addr_index (dwarf2_per_cu_data *per_cu, 20036 dwarf2_per_objfile *per_objfile, 20037 unsigned int addr_index) 20038 { 20039 struct dwarf2_cu *cu = per_objfile->get_cu (per_cu); 20040 gdb::optional<ULONGEST> addr_base; 20041 int addr_size; 20042 20043 /* We need addr_base and addr_size. 20044 If we don't have PER_CU->cu, we have to get it. 20045 Nasty, but the alternative is storing the needed info in PER_CU, 20046 which at this point doesn't seem justified: it's not clear how frequently 20047 it would get used and it would increase the size of every PER_CU. 20048 Entry points like dwarf2_per_cu_addr_size do a similar thing 20049 so we're not in uncharted territory here. 20050 Alas we need to be a bit more complicated as addr_base is contained 20051 in the DIE. 20052 20053 We don't need to read the entire CU(/TU). 20054 We just need the header and top level die. 20055 20056 IWBN to use the aging mechanism to let us lazily later discard the CU. 20057 For now we skip this optimization. */ 20058 20059 if (cu != NULL) 20060 { 20061 addr_base = cu->addr_base; 20062 addr_size = cu->header.addr_size; 20063 } 20064 else 20065 { 20066 cutu_reader reader (per_cu, per_objfile, nullptr, nullptr, false); 20067 addr_base = reader.cu->addr_base; 20068 addr_size = reader.cu->header.addr_size; 20069 } 20070 20071 return read_addr_index_1 (per_objfile, addr_index, addr_base, addr_size); 20072 } 20073 20074 /* Given a DW_FORM_GNU_str_index value STR_INDEX, fetch the string. 20075 STR_SECTION, STR_OFFSETS_SECTION can be from a Fission stub or a 20076 DWO file. */ 20077 20078 static const char * 20079 read_str_index (struct dwarf2_cu *cu, 20080 struct dwarf2_section_info *str_section, 20081 struct dwarf2_section_info *str_offsets_section, 20082 ULONGEST str_offsets_base, ULONGEST str_index) 20083 { 20084 dwarf2_per_objfile *per_objfile = cu->per_objfile; 20085 struct objfile *objfile = per_objfile->objfile; 20086 const char *objf_name = objfile_name (objfile); 20087 bfd *abfd = objfile->obfd; 20088 const gdb_byte *info_ptr; 20089 ULONGEST str_offset; 20090 static const char form_name[] = "DW_FORM_GNU_str_index or DW_FORM_strx"; 20091 20092 str_section->read (objfile); 20093 str_offsets_section->read (objfile); 20094 if (str_section->buffer == NULL) 20095 error (_("%s used without %s section" 20096 " in CU at offset %s [in module %s]"), 20097 form_name, str_section->get_name (), 20098 sect_offset_str (cu->header.sect_off), objf_name); 20099 if (str_offsets_section->buffer == NULL) 20100 error (_("%s used without %s section" 20101 " in CU at offset %s [in module %s]"), 20102 form_name, str_section->get_name (), 20103 sect_offset_str (cu->header.sect_off), objf_name); 20104 info_ptr = (str_offsets_section->buffer 20105 + str_offsets_base 20106 + str_index * cu->header.offset_size); 20107 if (cu->header.offset_size == 4) 20108 str_offset = bfd_get_32 (abfd, info_ptr); 20109 else 20110 str_offset = bfd_get_64 (abfd, info_ptr); 20111 if (str_offset >= str_section->size) 20112 error (_("Offset from %s pointing outside of" 20113 " .debug_str.dwo section in CU at offset %s [in module %s]"), 20114 form_name, sect_offset_str (cu->header.sect_off), objf_name); 20115 return (const char *) (str_section->buffer + str_offset); 20116 } 20117 20118 /* Given a DW_FORM_GNU_str_index from a DWO file, fetch the string. */ 20119 20120 static const char * 20121 read_dwo_str_index (const struct die_reader_specs *reader, ULONGEST str_index) 20122 { 20123 ULONGEST str_offsets_base = reader->cu->header.version >= 5 20124 ? reader->cu->header.addr_size : 0; 20125 return read_str_index (reader->cu, 20126 &reader->dwo_file->sections.str, 20127 &reader->dwo_file->sections.str_offsets, 20128 str_offsets_base, str_index); 20129 } 20130 20131 /* Given a DW_FORM_GNU_str_index from a Fission stub, fetch the string. */ 20132 20133 static const char * 20134 read_stub_str_index (struct dwarf2_cu *cu, ULONGEST str_index) 20135 { 20136 struct objfile *objfile = cu->per_objfile->objfile; 20137 const char *objf_name = objfile_name (objfile); 20138 static const char form_name[] = "DW_FORM_GNU_str_index"; 20139 static const char str_offsets_attr_name[] = "DW_AT_str_offsets"; 20140 20141 if (!cu->str_offsets_base.has_value ()) 20142 error (_("%s used in Fission stub without %s" 20143 " in CU at offset 0x%lx [in module %s]"), 20144 form_name, str_offsets_attr_name, 20145 (long) cu->header.offset_size, objf_name); 20146 20147 return read_str_index (cu, 20148 &cu->per_objfile->per_bfd->str, 20149 &cu->per_objfile->per_bfd->str_offsets, 20150 *cu->str_offsets_base, str_index); 20151 } 20152 20153 /* Return the length of an LEB128 number in BUF. */ 20154 20155 static int 20156 leb128_size (const gdb_byte *buf) 20157 { 20158 const gdb_byte *begin = buf; 20159 gdb_byte byte; 20160 20161 while (1) 20162 { 20163 byte = *buf++; 20164 if ((byte & 128) == 0) 20165 return buf - begin; 20166 } 20167 } 20168 20169 static void 20170 set_cu_language (unsigned int lang, struct dwarf2_cu *cu) 20171 { 20172 switch (lang) 20173 { 20174 case DW_LANG_C89: 20175 case DW_LANG_C99: 20176 case DW_LANG_C11: 20177 case DW_LANG_C: 20178 case DW_LANG_UPC: 20179 cu->language = language_c; 20180 break; 20181 case DW_LANG_Java: 20182 case DW_LANG_C_plus_plus: 20183 case DW_LANG_C_plus_plus_11: 20184 case DW_LANG_C_plus_plus_14: 20185 cu->language = language_cplus; 20186 break; 20187 case DW_LANG_D: 20188 cu->language = language_d; 20189 break; 20190 case DW_LANG_Fortran77: 20191 case DW_LANG_Fortran90: 20192 case DW_LANG_Fortran95: 20193 case DW_LANG_Fortran03: 20194 case DW_LANG_Fortran08: 20195 cu->language = language_fortran; 20196 break; 20197 case DW_LANG_Go: 20198 cu->language = language_go; 20199 break; 20200 case DW_LANG_Mips_Assembler: 20201 cu->language = language_asm; 20202 break; 20203 case DW_LANG_Ada83: 20204 case DW_LANG_Ada95: 20205 cu->language = language_ada; 20206 break; 20207 case DW_LANG_Modula2: 20208 cu->language = language_m2; 20209 break; 20210 case DW_LANG_Pascal83: 20211 cu->language = language_pascal; 20212 break; 20213 case DW_LANG_ObjC: 20214 cu->language = language_objc; 20215 break; 20216 case DW_LANG_Rust: 20217 case DW_LANG_Rust_old: 20218 cu->language = language_rust; 20219 break; 20220 case DW_LANG_Cobol74: 20221 case DW_LANG_Cobol85: 20222 default: 20223 cu->language = language_minimal; 20224 break; 20225 } 20226 cu->language_defn = language_def (cu->language); 20227 } 20228 20229 /* Return the named attribute or NULL if not there. */ 20230 20231 static struct attribute * 20232 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu) 20233 { 20234 for (;;) 20235 { 20236 unsigned int i; 20237 struct attribute *spec = NULL; 20238 20239 for (i = 0; i < die->num_attrs; ++i) 20240 { 20241 if (die->attrs[i].name == name) 20242 return &die->attrs[i]; 20243 if (die->attrs[i].name == DW_AT_specification 20244 || die->attrs[i].name == DW_AT_abstract_origin) 20245 spec = &die->attrs[i]; 20246 } 20247 20248 if (!spec) 20249 break; 20250 20251 die = follow_die_ref (die, spec, &cu); 20252 } 20253 20254 return NULL; 20255 } 20256 20257 /* Return the string associated with a string-typed attribute, or NULL if it 20258 is either not found or is of an incorrect type. */ 20259 20260 static const char * 20261 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu) 20262 { 20263 struct attribute *attr; 20264 const char *str = NULL; 20265 20266 attr = dwarf2_attr (die, name, cu); 20267 20268 if (attr != NULL) 20269 { 20270 str = attr->value_as_string (); 20271 if (str == nullptr) 20272 complaint (_("string type expected for attribute %s for " 20273 "DIE at %s in module %s"), 20274 dwarf_attr_name (name), sect_offset_str (die->sect_off), 20275 objfile_name (cu->per_objfile->objfile)); 20276 } 20277 20278 return str; 20279 } 20280 20281 /* Return the dwo name or NULL if not present. If present, it is in either 20282 DW_AT_GNU_dwo_name or DW_AT_dwo_name attribute. */ 20283 static const char * 20284 dwarf2_dwo_name (struct die_info *die, struct dwarf2_cu *cu) 20285 { 20286 const char *dwo_name = dwarf2_string_attr (die, DW_AT_GNU_dwo_name, cu); 20287 if (dwo_name == nullptr) 20288 dwo_name = dwarf2_string_attr (die, DW_AT_dwo_name, cu); 20289 return dwo_name; 20290 } 20291 20292 /* Return non-zero iff the attribute NAME is defined for the given DIE, 20293 and holds a non-zero value. This function should only be used for 20294 DW_FORM_flag or DW_FORM_flag_present attributes. */ 20295 20296 static int 20297 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu) 20298 { 20299 struct attribute *attr = dwarf2_attr (die, name, cu); 20300 20301 return (attr && DW_UNSND (attr)); 20302 } 20303 20304 static int 20305 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu) 20306 { 20307 /* A DIE is a declaration if it has a DW_AT_declaration attribute 20308 which value is non-zero. However, we have to be careful with 20309 DIEs having a DW_AT_specification attribute, because dwarf2_attr() 20310 (via dwarf2_flag_true_p) follows this attribute. So we may 20311 end up accidently finding a declaration attribute that belongs 20312 to a different DIE referenced by the specification attribute, 20313 even though the given DIE does not have a declaration attribute. */ 20314 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu) 20315 && dwarf2_attr (die, DW_AT_specification, cu) == NULL); 20316 } 20317 20318 /* Return the die giving the specification for DIE, if there is 20319 one. *SPEC_CU is the CU containing DIE on input, and the CU 20320 containing the return value on output. If there is no 20321 specification, but there is an abstract origin, that is 20322 returned. */ 20323 20324 static struct die_info * 20325 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu) 20326 { 20327 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification, 20328 *spec_cu); 20329 20330 if (spec_attr == NULL) 20331 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu); 20332 20333 if (spec_attr == NULL) 20334 return NULL; 20335 else 20336 return follow_die_ref (die, spec_attr, spec_cu); 20337 } 20338 20339 /* Stub for free_line_header to match void * callback types. */ 20340 20341 static void 20342 free_line_header_voidp (void *arg) 20343 { 20344 struct line_header *lh = (struct line_header *) arg; 20345 20346 delete lh; 20347 } 20348 20349 /* A convenience function to find the proper .debug_line section for a CU. */ 20350 20351 static struct dwarf2_section_info * 20352 get_debug_line_section (struct dwarf2_cu *cu) 20353 { 20354 struct dwarf2_section_info *section; 20355 dwarf2_per_objfile *per_objfile = cu->per_objfile; 20356 20357 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the 20358 DWO file. */ 20359 if (cu->dwo_unit && cu->per_cu->is_debug_types) 20360 section = &cu->dwo_unit->dwo_file->sections.line; 20361 else if (cu->per_cu->is_dwz) 20362 { 20363 dwz_file *dwz = dwarf2_get_dwz_file (per_objfile->per_bfd); 20364 20365 section = &dwz->line; 20366 } 20367 else 20368 section = &per_objfile->per_bfd->line; 20369 20370 return section; 20371 } 20372 20373 /* Read the statement program header starting at OFFSET in 20374 .debug_line, or .debug_line.dwo. Return a pointer 20375 to a struct line_header, allocated using xmalloc. 20376 Returns NULL if there is a problem reading the header, e.g., if it 20377 has a version we don't understand. 20378 20379 NOTE: the strings in the include directory and file name tables of 20380 the returned object point into the dwarf line section buffer, 20381 and must not be freed. */ 20382 20383 static line_header_up 20384 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu) 20385 { 20386 struct dwarf2_section_info *section; 20387 dwarf2_per_objfile *per_objfile = cu->per_objfile; 20388 20389 section = get_debug_line_section (cu); 20390 section->read (per_objfile->objfile); 20391 if (section->buffer == NULL) 20392 { 20393 if (cu->dwo_unit && cu->per_cu->is_debug_types) 20394 complaint (_("missing .debug_line.dwo section")); 20395 else 20396 complaint (_("missing .debug_line section")); 20397 return 0; 20398 } 20399 20400 return dwarf_decode_line_header (sect_off, cu->per_cu->is_dwz, 20401 per_objfile, section, &cu->header); 20402 } 20403 20404 /* Subroutine of dwarf_decode_lines to simplify it. 20405 Return the file name of the psymtab for the given file_entry. 20406 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown. 20407 If space for the result is malloc'd, *NAME_HOLDER will be set. 20408 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */ 20409 20410 static const char * 20411 psymtab_include_file_name (const struct line_header *lh, const file_entry &fe, 20412 const dwarf2_psymtab *pst, 20413 const char *comp_dir, 20414 gdb::unique_xmalloc_ptr<char> *name_holder) 20415 { 20416 const char *include_name = fe.name; 20417 const char *include_name_to_compare = include_name; 20418 const char *pst_filename; 20419 int file_is_pst; 20420 20421 const char *dir_name = fe.include_dir (lh); 20422 20423 gdb::unique_xmalloc_ptr<char> hold_compare; 20424 if (!IS_ABSOLUTE_PATH (include_name) 20425 && (dir_name != NULL || comp_dir != NULL)) 20426 { 20427 /* Avoid creating a duplicate psymtab for PST. 20428 We do this by comparing INCLUDE_NAME and PST_FILENAME. 20429 Before we do the comparison, however, we need to account 20430 for DIR_NAME and COMP_DIR. 20431 First prepend dir_name (if non-NULL). If we still don't 20432 have an absolute path prepend comp_dir (if non-NULL). 20433 However, the directory we record in the include-file's 20434 psymtab does not contain COMP_DIR (to match the 20435 corresponding symtab(s)). 20436 20437 Example: 20438 20439 bash$ cd /tmp 20440 bash$ gcc -g ./hello.c 20441 include_name = "hello.c" 20442 dir_name = "." 20443 DW_AT_comp_dir = comp_dir = "/tmp" 20444 DW_AT_name = "./hello.c" 20445 20446 */ 20447 20448 if (dir_name != NULL) 20449 { 20450 name_holder->reset (concat (dir_name, SLASH_STRING, 20451 include_name, (char *) NULL)); 20452 include_name = name_holder->get (); 20453 include_name_to_compare = include_name; 20454 } 20455 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL) 20456 { 20457 hold_compare.reset (concat (comp_dir, SLASH_STRING, 20458 include_name, (char *) NULL)); 20459 include_name_to_compare = hold_compare.get (); 20460 } 20461 } 20462 20463 pst_filename = pst->filename; 20464 gdb::unique_xmalloc_ptr<char> copied_name; 20465 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL) 20466 { 20467 copied_name.reset (concat (pst->dirname, SLASH_STRING, 20468 pst_filename, (char *) NULL)); 20469 pst_filename = copied_name.get (); 20470 } 20471 20472 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0; 20473 20474 if (file_is_pst) 20475 return NULL; 20476 return include_name; 20477 } 20478 20479 /* State machine to track the state of the line number program. */ 20480 20481 class lnp_state_machine 20482 { 20483 public: 20484 /* Initialize a machine state for the start of a line number 20485 program. */ 20486 lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, line_header *lh, 20487 bool record_lines_p); 20488 20489 file_entry *current_file () 20490 { 20491 /* lh->file_names is 0-based, but the file name numbers in the 20492 statement program are 1-based. */ 20493 return m_line_header->file_name_at (m_file); 20494 } 20495 20496 /* Record the line in the state machine. END_SEQUENCE is true if 20497 we're processing the end of a sequence. */ 20498 void record_line (bool end_sequence); 20499 20500 /* Check ADDRESS is -1, or zero and less than UNRELOCATED_LOWPC, and if true 20501 nop-out rest of the lines in this sequence. */ 20502 void check_line_address (struct dwarf2_cu *cu, 20503 const gdb_byte *line_ptr, 20504 CORE_ADDR unrelocated_lowpc, CORE_ADDR address); 20505 20506 void handle_set_discriminator (unsigned int discriminator) 20507 { 20508 m_discriminator = discriminator; 20509 m_line_has_non_zero_discriminator |= discriminator != 0; 20510 } 20511 20512 /* Handle DW_LNE_set_address. */ 20513 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address) 20514 { 20515 m_op_index = 0; 20516 address += baseaddr; 20517 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false); 20518 } 20519 20520 /* Handle DW_LNS_advance_pc. */ 20521 void handle_advance_pc (CORE_ADDR adjust); 20522 20523 /* Handle a special opcode. */ 20524 void handle_special_opcode (unsigned char op_code); 20525 20526 /* Handle DW_LNS_advance_line. */ 20527 void handle_advance_line (int line_delta) 20528 { 20529 advance_line (line_delta); 20530 } 20531 20532 /* Handle DW_LNS_set_file. */ 20533 void handle_set_file (file_name_index file); 20534 20535 /* Handle DW_LNS_negate_stmt. */ 20536 void handle_negate_stmt () 20537 { 20538 m_is_stmt = !m_is_stmt; 20539 } 20540 20541 /* Handle DW_LNS_const_add_pc. */ 20542 void handle_const_add_pc (); 20543 20544 /* Handle DW_LNS_fixed_advance_pc. */ 20545 void handle_fixed_advance_pc (CORE_ADDR addr_adj) 20546 { 20547 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true); 20548 m_op_index = 0; 20549 } 20550 20551 /* Handle DW_LNS_copy. */ 20552 void handle_copy () 20553 { 20554 record_line (false); 20555 m_discriminator = 0; 20556 } 20557 20558 /* Handle DW_LNE_end_sequence. */ 20559 void handle_end_sequence () 20560 { 20561 m_currently_recording_lines = true; 20562 } 20563 20564 private: 20565 /* Advance the line by LINE_DELTA. */ 20566 void advance_line (int line_delta) 20567 { 20568 m_line += line_delta; 20569 20570 if (line_delta != 0) 20571 m_line_has_non_zero_discriminator = m_discriminator != 0; 20572 } 20573 20574 struct dwarf2_cu *m_cu; 20575 20576 gdbarch *m_gdbarch; 20577 20578 /* True if we're recording lines. 20579 Otherwise we're building partial symtabs and are just interested in 20580 finding include files mentioned by the line number program. */ 20581 bool m_record_lines_p; 20582 20583 /* The line number header. */ 20584 line_header *m_line_header; 20585 20586 /* These are part of the standard DWARF line number state machine, 20587 and initialized according to the DWARF spec. */ 20588 20589 unsigned char m_op_index = 0; 20590 /* The line table index of the current file. */ 20591 file_name_index m_file = 1; 20592 unsigned int m_line = 1; 20593 20594 /* These are initialized in the constructor. */ 20595 20596 CORE_ADDR m_address; 20597 bool m_is_stmt; 20598 unsigned int m_discriminator; 20599 20600 /* Additional bits of state we need to track. */ 20601 20602 /* The last file that we called dwarf2_start_subfile for. 20603 This is only used for TLLs. */ 20604 unsigned int m_last_file = 0; 20605 /* The last file a line number was recorded for. */ 20606 struct subfile *m_last_subfile = NULL; 20607 20608 /* The address of the last line entry. */ 20609 CORE_ADDR m_last_address; 20610 20611 /* Set to true when a previous line at the same address (using 20612 m_last_address) had m_is_stmt true. This is reset to false when a 20613 line entry at a new address (m_address different to m_last_address) is 20614 processed. */ 20615 bool m_stmt_at_address = false; 20616 20617 /* When true, record the lines we decode. */ 20618 bool m_currently_recording_lines = false; 20619 20620 /* The last line number that was recorded, used to coalesce 20621 consecutive entries for the same line. This can happen, for 20622 example, when discriminators are present. PR 17276. */ 20623 unsigned int m_last_line = 0; 20624 bool m_line_has_non_zero_discriminator = false; 20625 }; 20626 20627 void 20628 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust) 20629 { 20630 CORE_ADDR addr_adj = (((m_op_index + adjust) 20631 / m_line_header->maximum_ops_per_instruction) 20632 * m_line_header->minimum_instruction_length); 20633 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true); 20634 m_op_index = ((m_op_index + adjust) 20635 % m_line_header->maximum_ops_per_instruction); 20636 } 20637 20638 void 20639 lnp_state_machine::handle_special_opcode (unsigned char op_code) 20640 { 20641 unsigned char adj_opcode = op_code - m_line_header->opcode_base; 20642 unsigned char adj_opcode_d = adj_opcode / m_line_header->line_range; 20643 unsigned char adj_opcode_r = adj_opcode % m_line_header->line_range; 20644 CORE_ADDR addr_adj = (((m_op_index + adj_opcode_d) 20645 / m_line_header->maximum_ops_per_instruction) 20646 * m_line_header->minimum_instruction_length); 20647 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true); 20648 m_op_index = ((m_op_index + adj_opcode_d) 20649 % m_line_header->maximum_ops_per_instruction); 20650 20651 int line_delta = m_line_header->line_base + adj_opcode_r; 20652 advance_line (line_delta); 20653 record_line (false); 20654 m_discriminator = 0; 20655 } 20656 20657 void 20658 lnp_state_machine::handle_set_file (file_name_index file) 20659 { 20660 m_file = file; 20661 20662 const file_entry *fe = current_file (); 20663 if (fe == NULL) 20664 dwarf2_debug_line_missing_file_complaint (); 20665 else if (m_record_lines_p) 20666 { 20667 const char *dir = fe->include_dir (m_line_header); 20668 20669 m_last_subfile = m_cu->get_builder ()->get_current_subfile (); 20670 m_line_has_non_zero_discriminator = m_discriminator != 0; 20671 dwarf2_start_subfile (m_cu, fe->name, dir); 20672 } 20673 } 20674 20675 void 20676 lnp_state_machine::handle_const_add_pc () 20677 { 20678 CORE_ADDR adjust 20679 = (255 - m_line_header->opcode_base) / m_line_header->line_range; 20680 20681 CORE_ADDR addr_adj 20682 = (((m_op_index + adjust) 20683 / m_line_header->maximum_ops_per_instruction) 20684 * m_line_header->minimum_instruction_length); 20685 20686 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true); 20687 m_op_index = ((m_op_index + adjust) 20688 % m_line_header->maximum_ops_per_instruction); 20689 } 20690 20691 /* Return non-zero if we should add LINE to the line number table. 20692 LINE is the line to add, LAST_LINE is the last line that was added, 20693 LAST_SUBFILE is the subfile for LAST_LINE. 20694 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever 20695 had a non-zero discriminator. 20696 20697 We have to be careful in the presence of discriminators. 20698 E.g., for this line: 20699 20700 for (i = 0; i < 100000; i++); 20701 20702 clang can emit four line number entries for that one line, 20703 each with a different discriminator. 20704 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example. 20705 20706 However, we want gdb to coalesce all four entries into one. 20707 Otherwise the user could stepi into the middle of the line and 20708 gdb would get confused about whether the pc really was in the 20709 middle of the line. 20710 20711 Things are further complicated by the fact that two consecutive 20712 line number entries for the same line is a heuristic used by gcc 20713 to denote the end of the prologue. So we can't just discard duplicate 20714 entries, we have to be selective about it. The heuristic we use is 20715 that we only collapse consecutive entries for the same line if at least 20716 one of those entries has a non-zero discriminator. PR 17276. 20717 20718 Note: Addresses in the line number state machine can never go backwards 20719 within one sequence, thus this coalescing is ok. */ 20720 20721 static int 20722 dwarf_record_line_p (struct dwarf2_cu *cu, 20723 unsigned int line, unsigned int last_line, 20724 int line_has_non_zero_discriminator, 20725 struct subfile *last_subfile) 20726 { 20727 if (cu->get_builder ()->get_current_subfile () != last_subfile) 20728 return 1; 20729 if (line != last_line) 20730 return 1; 20731 /* Same line for the same file that we've seen already. 20732 As a last check, for pr 17276, only record the line if the line 20733 has never had a non-zero discriminator. */ 20734 if (!line_has_non_zero_discriminator) 20735 return 1; 20736 return 0; 20737 } 20738 20739 /* Use the CU's builder to record line number LINE beginning at 20740 address ADDRESS in the line table of subfile SUBFILE. */ 20741 20742 static void 20743 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile, 20744 unsigned int line, CORE_ADDR address, bool is_stmt, 20745 struct dwarf2_cu *cu) 20746 { 20747 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address); 20748 20749 if (dwarf_line_debug) 20750 { 20751 fprintf_unfiltered (gdb_stdlog, 20752 "Recording line %u, file %s, address %s\n", 20753 line, lbasename (subfile->name), 20754 paddress (gdbarch, address)); 20755 } 20756 20757 if (cu != nullptr) 20758 cu->get_builder ()->record_line (subfile, line, addr, is_stmt); 20759 } 20760 20761 /* Subroutine of dwarf_decode_lines_1 to simplify it. 20762 Mark the end of a set of line number records. 20763 The arguments are the same as for dwarf_record_line_1. 20764 If SUBFILE is NULL the request is ignored. */ 20765 20766 static void 20767 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile, 20768 CORE_ADDR address, struct dwarf2_cu *cu) 20769 { 20770 if (subfile == NULL) 20771 return; 20772 20773 if (dwarf_line_debug) 20774 { 20775 fprintf_unfiltered (gdb_stdlog, 20776 "Finishing current line, file %s, address %s\n", 20777 lbasename (subfile->name), 20778 paddress (gdbarch, address)); 20779 } 20780 20781 dwarf_record_line_1 (gdbarch, subfile, 0, address, true, cu); 20782 } 20783 20784 void 20785 lnp_state_machine::record_line (bool end_sequence) 20786 { 20787 if (dwarf_line_debug) 20788 { 20789 fprintf_unfiltered (gdb_stdlog, 20790 "Processing actual line %u: file %u," 20791 " address %s, is_stmt %u, discrim %u%s\n", 20792 m_line, m_file, 20793 paddress (m_gdbarch, m_address), 20794 m_is_stmt, m_discriminator, 20795 (end_sequence ? "\t(end sequence)" : "")); 20796 } 20797 20798 file_entry *fe = current_file (); 20799 20800 if (fe == NULL) 20801 dwarf2_debug_line_missing_file_complaint (); 20802 /* For now we ignore lines not starting on an instruction boundary. 20803 But not when processing end_sequence for compatibility with the 20804 previous version of the code. */ 20805 else if (m_op_index == 0 || end_sequence) 20806 { 20807 fe->included_p = 1; 20808 if (m_record_lines_p) 20809 { 20810 /* When we switch files we insert an end maker in the first file, 20811 switch to the second file and add a new line entry. The 20812 problem is that the end marker inserted in the first file will 20813 discard any previous line entries at the same address. If the 20814 line entries in the first file are marked as is-stmt, while 20815 the new line in the second file is non-stmt, then this means 20816 the end marker will discard is-stmt lines so we can have a 20817 non-stmt line. This means that there are less addresses at 20818 which the user can insert a breakpoint. 20819 20820 To improve this we track the last address in m_last_address, 20821 and whether we have seen an is-stmt at this address. Then 20822 when switching files, if we have seen a stmt at the current 20823 address, and we are switching to create a non-stmt line, then 20824 discard the new line. */ 20825 bool file_changed 20826 = m_last_subfile != m_cu->get_builder ()->get_current_subfile (); 20827 bool ignore_this_line 20828 = ((file_changed && !end_sequence && m_last_address == m_address 20829 && !m_is_stmt && m_stmt_at_address) 20830 || (!end_sequence && m_line == 0)); 20831 20832 if ((file_changed && !ignore_this_line) || end_sequence) 20833 { 20834 dwarf_finish_line (m_gdbarch, m_last_subfile, m_address, 20835 m_currently_recording_lines ? m_cu : nullptr); 20836 } 20837 20838 if (!end_sequence && !ignore_this_line) 20839 { 20840 bool is_stmt = producer_is_codewarrior (m_cu) || m_is_stmt; 20841 20842 if (dwarf_record_line_p (m_cu, m_line, m_last_line, 20843 m_line_has_non_zero_discriminator, 20844 m_last_subfile)) 20845 { 20846 buildsym_compunit *builder = m_cu->get_builder (); 20847 dwarf_record_line_1 (m_gdbarch, 20848 builder->get_current_subfile (), 20849 m_line, m_address, is_stmt, 20850 m_currently_recording_lines ? m_cu : nullptr); 20851 } 20852 m_last_subfile = m_cu->get_builder ()->get_current_subfile (); 20853 m_last_line = m_line; 20854 } 20855 } 20856 } 20857 20858 /* Track whether we have seen any m_is_stmt true at m_address in case we 20859 have multiple line table entries all at m_address. */ 20860 if (m_last_address != m_address) 20861 { 20862 m_stmt_at_address = false; 20863 m_last_address = m_address; 20864 } 20865 m_stmt_at_address |= m_is_stmt; 20866 } 20867 20868 lnp_state_machine::lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, 20869 line_header *lh, bool record_lines_p) 20870 { 20871 m_cu = cu; 20872 m_gdbarch = arch; 20873 m_record_lines_p = record_lines_p; 20874 m_line_header = lh; 20875 20876 m_currently_recording_lines = true; 20877 20878 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there 20879 was a line entry for it so that the backend has a chance to adjust it 20880 and also record it in case it needs it. This is currently used by MIPS 20881 code, cf. `mips_adjust_dwarf2_line'. */ 20882 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0); 20883 m_is_stmt = lh->default_is_stmt; 20884 m_discriminator = 0; 20885 20886 m_last_address = m_address; 20887 m_stmt_at_address = false; 20888 } 20889 20890 void 20891 lnp_state_machine::check_line_address (struct dwarf2_cu *cu, 20892 const gdb_byte *line_ptr, 20893 CORE_ADDR unrelocated_lowpc, CORE_ADDR address) 20894 { 20895 /* Linkers resolve a symbolic relocation referencing a GC'd function to 0 or 20896 -1. If ADDRESS is 0, ignoring the opcode will err if the text section is 20897 located at 0x0. In this case, additionally check that if 20898 ADDRESS < UNRELOCATED_LOWPC. */ 20899 20900 if ((address == 0 && address < unrelocated_lowpc) 20901 || address == (CORE_ADDR) -1) 20902 { 20903 /* This line table is for a function which has been 20904 GCd by the linker. Ignore it. PR gdb/12528 */ 20905 20906 struct objfile *objfile = cu->per_objfile->objfile; 20907 long line_offset = line_ptr - get_debug_line_section (cu)->buffer; 20908 20909 complaint (_(".debug_line address at offset 0x%lx is 0 [in module %s]"), 20910 line_offset, objfile_name (objfile)); 20911 m_currently_recording_lines = false; 20912 /* Note: m_currently_recording_lines is left as false until we see 20913 DW_LNE_end_sequence. */ 20914 } 20915 } 20916 20917 /* Subroutine of dwarf_decode_lines to simplify it. 20918 Process the line number information in LH. 20919 If DECODE_FOR_PST_P is non-zero, all we do is process the line number 20920 program in order to set included_p for every referenced header. */ 20921 20922 static void 20923 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu, 20924 const int decode_for_pst_p, CORE_ADDR lowpc) 20925 { 20926 const gdb_byte *line_ptr, *extended_end; 20927 const gdb_byte *line_end; 20928 unsigned int bytes_read, extended_len; 20929 unsigned char op_code, extended_op; 20930 CORE_ADDR baseaddr; 20931 struct objfile *objfile = cu->per_objfile->objfile; 20932 bfd *abfd = objfile->obfd; 20933 struct gdbarch *gdbarch = objfile->arch (); 20934 /* True if we're recording line info (as opposed to building partial 20935 symtabs and just interested in finding include files mentioned by 20936 the line number program). */ 20937 bool record_lines_p = !decode_for_pst_p; 20938 20939 baseaddr = objfile->text_section_offset (); 20940 20941 line_ptr = lh->statement_program_start; 20942 line_end = lh->statement_program_end; 20943 20944 /* Read the statement sequences until there's nothing left. */ 20945 while (line_ptr < line_end) 20946 { 20947 /* The DWARF line number program state machine. Reset the state 20948 machine at the start of each sequence. */ 20949 lnp_state_machine state_machine (cu, gdbarch, lh, record_lines_p); 20950 bool end_sequence = false; 20951 20952 if (record_lines_p) 20953 { 20954 /* Start a subfile for the current file of the state 20955 machine. */ 20956 const file_entry *fe = state_machine.current_file (); 20957 20958 if (fe != NULL) 20959 dwarf2_start_subfile (cu, fe->name, fe->include_dir (lh)); 20960 } 20961 20962 /* Decode the table. */ 20963 while (line_ptr < line_end && !end_sequence) 20964 { 20965 op_code = read_1_byte (abfd, line_ptr); 20966 line_ptr += 1; 20967 20968 if (op_code >= lh->opcode_base) 20969 { 20970 /* Special opcode. */ 20971 state_machine.handle_special_opcode (op_code); 20972 } 20973 else switch (op_code) 20974 { 20975 case DW_LNS_extended_op: 20976 extended_len = read_unsigned_leb128 (abfd, line_ptr, 20977 &bytes_read); 20978 line_ptr += bytes_read; 20979 extended_end = line_ptr + extended_len; 20980 extended_op = read_1_byte (abfd, line_ptr); 20981 line_ptr += 1; 20982 if (DW_LNE_lo_user <= extended_op 20983 && extended_op <= DW_LNE_hi_user) 20984 { 20985 /* Vendor extension, ignore. */ 20986 line_ptr = extended_end; 20987 break; 20988 } 20989 switch (extended_op) 20990 { 20991 case DW_LNE_end_sequence: 20992 state_machine.handle_end_sequence (); 20993 end_sequence = true; 20994 break; 20995 case DW_LNE_set_address: 20996 { 20997 CORE_ADDR address 20998 = cu->header.read_address (abfd, line_ptr, &bytes_read); 20999 line_ptr += bytes_read; 21000 21001 state_machine.check_line_address (cu, line_ptr, 21002 lowpc - baseaddr, address); 21003 state_machine.handle_set_address (baseaddr, address); 21004 } 21005 break; 21006 case DW_LNE_define_file: 21007 { 21008 const char *cur_file; 21009 unsigned int mod_time, length; 21010 dir_index dindex; 21011 21012 cur_file = read_direct_string (abfd, line_ptr, 21013 &bytes_read); 21014 line_ptr += bytes_read; 21015 dindex = (dir_index) 21016 read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 21017 line_ptr += bytes_read; 21018 mod_time = 21019 read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 21020 line_ptr += bytes_read; 21021 length = 21022 read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 21023 line_ptr += bytes_read; 21024 lh->add_file_name (cur_file, dindex, mod_time, length); 21025 } 21026 break; 21027 case DW_LNE_set_discriminator: 21028 { 21029 /* The discriminator is not interesting to the 21030 debugger; just ignore it. We still need to 21031 check its value though: 21032 if there are consecutive entries for the same 21033 (non-prologue) line we want to coalesce them. 21034 PR 17276. */ 21035 unsigned int discr 21036 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 21037 line_ptr += bytes_read; 21038 21039 state_machine.handle_set_discriminator (discr); 21040 } 21041 break; 21042 default: 21043 complaint (_("mangled .debug_line section")); 21044 return; 21045 } 21046 /* Make sure that we parsed the extended op correctly. If e.g. 21047 we expected a different address size than the producer used, 21048 we may have read the wrong number of bytes. */ 21049 if (line_ptr != extended_end) 21050 { 21051 complaint (_("mangled .debug_line section")); 21052 return; 21053 } 21054 break; 21055 case DW_LNS_copy: 21056 state_machine.handle_copy (); 21057 break; 21058 case DW_LNS_advance_pc: 21059 { 21060 CORE_ADDR adjust 21061 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 21062 line_ptr += bytes_read; 21063 21064 state_machine.handle_advance_pc (adjust); 21065 } 21066 break; 21067 case DW_LNS_advance_line: 21068 { 21069 int line_delta 21070 = read_signed_leb128 (abfd, line_ptr, &bytes_read); 21071 line_ptr += bytes_read; 21072 21073 state_machine.handle_advance_line (line_delta); 21074 } 21075 break; 21076 case DW_LNS_set_file: 21077 { 21078 file_name_index file 21079 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr, 21080 &bytes_read); 21081 line_ptr += bytes_read; 21082 21083 state_machine.handle_set_file (file); 21084 } 21085 break; 21086 case DW_LNS_set_column: 21087 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 21088 line_ptr += bytes_read; 21089 break; 21090 case DW_LNS_negate_stmt: 21091 state_machine.handle_negate_stmt (); 21092 break; 21093 case DW_LNS_set_basic_block: 21094 break; 21095 /* Add to the address register of the state machine the 21096 address increment value corresponding to special opcode 21097 255. I.e., this value is scaled by the minimum 21098 instruction length since special opcode 255 would have 21099 scaled the increment. */ 21100 case DW_LNS_const_add_pc: 21101 state_machine.handle_const_add_pc (); 21102 break; 21103 case DW_LNS_fixed_advance_pc: 21104 { 21105 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr); 21106 line_ptr += 2; 21107 21108 state_machine.handle_fixed_advance_pc (addr_adj); 21109 } 21110 break; 21111 default: 21112 { 21113 /* Unknown standard opcode, ignore it. */ 21114 int i; 21115 21116 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++) 21117 { 21118 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 21119 line_ptr += bytes_read; 21120 } 21121 } 21122 } 21123 } 21124 21125 if (!end_sequence) 21126 dwarf2_debug_line_missing_end_sequence_complaint (); 21127 21128 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer, 21129 in which case we still finish recording the last line). */ 21130 state_machine.record_line (true); 21131 } 21132 } 21133 21134 /* Decode the Line Number Program (LNP) for the given line_header 21135 structure and CU. The actual information extracted and the type 21136 of structures created from the LNP depends on the value of PST. 21137 21138 1. If PST is NULL, then this procedure uses the data from the program 21139 to create all necessary symbol tables, and their linetables. 21140 21141 2. If PST is not NULL, this procedure reads the program to determine 21142 the list of files included by the unit represented by PST, and 21143 builds all the associated partial symbol tables. 21144 21145 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown. 21146 It is used for relative paths in the line table. 21147 NOTE: When processing partial symtabs (pst != NULL), 21148 comp_dir == pst->dirname. 21149 21150 NOTE: It is important that psymtabs have the same file name (via strcmp) 21151 as the corresponding symtab. Since COMP_DIR is not used in the name of the 21152 symtab we don't use it in the name of the psymtabs we create. 21153 E.g. expand_line_sal requires this when finding psymtabs to expand. 21154 A good testcase for this is mb-inline.exp. 21155 21156 LOWPC is the lowest address in CU (or 0 if not known). 21157 21158 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line 21159 for its PC<->lines mapping information. Otherwise only the filename 21160 table is read in. */ 21161 21162 static void 21163 dwarf_decode_lines (struct line_header *lh, const char *comp_dir, 21164 struct dwarf2_cu *cu, dwarf2_psymtab *pst, 21165 CORE_ADDR lowpc, int decode_mapping) 21166 { 21167 struct objfile *objfile = cu->per_objfile->objfile; 21168 const int decode_for_pst_p = (pst != NULL); 21169 21170 if (decode_mapping) 21171 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc); 21172 21173 if (decode_for_pst_p) 21174 { 21175 /* Now that we're done scanning the Line Header Program, we can 21176 create the psymtab of each included file. */ 21177 for (auto &file_entry : lh->file_names ()) 21178 if (file_entry.included_p == 1) 21179 { 21180 gdb::unique_xmalloc_ptr<char> name_holder; 21181 const char *include_name = 21182 psymtab_include_file_name (lh, file_entry, pst, 21183 comp_dir, &name_holder); 21184 if (include_name != NULL) 21185 dwarf2_create_include_psymtab (include_name, pst, objfile); 21186 } 21187 } 21188 else 21189 { 21190 /* Make sure a symtab is created for every file, even files 21191 which contain only variables (i.e. no code with associated 21192 line numbers). */ 21193 buildsym_compunit *builder = cu->get_builder (); 21194 struct compunit_symtab *cust = builder->get_compunit_symtab (); 21195 21196 for (auto &fe : lh->file_names ()) 21197 { 21198 dwarf2_start_subfile (cu, fe.name, fe.include_dir (lh)); 21199 if (builder->get_current_subfile ()->symtab == NULL) 21200 { 21201 builder->get_current_subfile ()->symtab 21202 = allocate_symtab (cust, 21203 builder->get_current_subfile ()->name); 21204 } 21205 fe.symtab = builder->get_current_subfile ()->symtab; 21206 } 21207 } 21208 } 21209 21210 /* Start a subfile for DWARF. FILENAME is the name of the file and 21211 DIRNAME the name of the source directory which contains FILENAME 21212 or NULL if not known. 21213 This routine tries to keep line numbers from identical absolute and 21214 relative file names in a common subfile. 21215 21216 Using the `list' example from the GDB testsuite, which resides in 21217 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename 21218 of /srcdir/list0.c yields the following debugging information for list0.c: 21219 21220 DW_AT_name: /srcdir/list0.c 21221 DW_AT_comp_dir: /compdir 21222 files.files[0].name: list0.h 21223 files.files[0].dir: /srcdir 21224 files.files[1].name: list0.c 21225 files.files[1].dir: /srcdir 21226 21227 The line number information for list0.c has to end up in a single 21228 subfile, so that `break /srcdir/list0.c:1' works as expected. 21229 start_subfile will ensure that this happens provided that we pass the 21230 concatenation of files.files[1].dir and files.files[1].name as the 21231 subfile's name. */ 21232 21233 static void 21234 dwarf2_start_subfile (struct dwarf2_cu *cu, const char *filename, 21235 const char *dirname) 21236 { 21237 gdb::unique_xmalloc_ptr<char> copy; 21238 21239 /* In order not to lose the line information directory, 21240 we concatenate it to the filename when it makes sense. 21241 Note that the Dwarf3 standard says (speaking of filenames in line 21242 information): ``The directory index is ignored for file names 21243 that represent full path names''. Thus ignoring dirname in the 21244 `else' branch below isn't an issue. */ 21245 21246 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL) 21247 { 21248 copy.reset (concat (dirname, SLASH_STRING, filename, (char *) NULL)); 21249 filename = copy.get (); 21250 } 21251 21252 cu->get_builder ()->start_subfile (filename); 21253 } 21254 21255 /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the 21256 buildsym_compunit constructor. */ 21257 21258 struct compunit_symtab * 21259 dwarf2_cu::start_symtab (const char *name, const char *comp_dir, 21260 CORE_ADDR low_pc) 21261 { 21262 gdb_assert (m_builder == nullptr); 21263 21264 m_builder.reset (new struct buildsym_compunit 21265 (this->per_objfile->objfile, 21266 name, comp_dir, language, low_pc)); 21267 21268 list_in_scope = get_builder ()->get_file_symbols (); 21269 21270 get_builder ()->record_debugformat ("DWARF 2"); 21271 get_builder ()->record_producer (producer); 21272 21273 processing_has_namespace_info = false; 21274 21275 return get_builder ()->get_compunit_symtab (); 21276 } 21277 21278 static void 21279 var_decode_location (struct attribute *attr, struct symbol *sym, 21280 struct dwarf2_cu *cu) 21281 { 21282 struct objfile *objfile = cu->per_objfile->objfile; 21283 struct comp_unit_head *cu_header = &cu->header; 21284 21285 /* NOTE drow/2003-01-30: There used to be a comment and some special 21286 code here to turn a symbol with DW_AT_external and a 21287 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was 21288 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux 21289 with some versions of binutils) where shared libraries could have 21290 relocations against symbols in their debug information - the 21291 minimal symbol would have the right address, but the debug info 21292 would not. It's no longer necessary, because we will explicitly 21293 apply relocations when we read in the debug information now. */ 21294 21295 /* A DW_AT_location attribute with no contents indicates that a 21296 variable has been optimized away. */ 21297 if (attr->form_is_block () && DW_BLOCK (attr)->size == 0) 21298 { 21299 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT; 21300 return; 21301 } 21302 21303 /* Handle one degenerate form of location expression specially, to 21304 preserve GDB's previous behavior when section offsets are 21305 specified. If this is just a DW_OP_addr, DW_OP_addrx, or 21306 DW_OP_GNU_addr_index then mark this symbol as LOC_STATIC. */ 21307 21308 if (attr->form_is_block () 21309 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr 21310 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size) 21311 || ((DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index 21312 || DW_BLOCK (attr)->data[0] == DW_OP_addrx) 21313 && (DW_BLOCK (attr)->size 21314 == 1 + leb128_size (&DW_BLOCK (attr)->data[1]))))) 21315 { 21316 unsigned int dummy; 21317 21318 if (DW_BLOCK (attr)->data[0] == DW_OP_addr) 21319 SET_SYMBOL_VALUE_ADDRESS 21320 (sym, cu->header.read_address (objfile->obfd, 21321 DW_BLOCK (attr)->data + 1, 21322 &dummy)); 21323 else 21324 SET_SYMBOL_VALUE_ADDRESS 21325 (sym, read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, 21326 &dummy)); 21327 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC; 21328 fixup_symbol_section (sym, objfile); 21329 SET_SYMBOL_VALUE_ADDRESS 21330 (sym, 21331 SYMBOL_VALUE_ADDRESS (sym) 21332 + objfile->section_offsets[SYMBOL_SECTION (sym)]); 21333 return; 21334 } 21335 21336 /* NOTE drow/2002-01-30: It might be worthwhile to have a static 21337 expression evaluator, and use LOC_COMPUTED only when necessary 21338 (i.e. when the value of a register or memory location is 21339 referenced, or a thread-local block, etc.). Then again, it might 21340 not be worthwhile. I'm assuming that it isn't unless performance 21341 or memory numbers show me otherwise. */ 21342 21343 dwarf2_symbol_mark_computed (attr, sym, cu, 0); 21344 21345 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist) 21346 cu->has_loclist = true; 21347 } 21348 21349 /* Given a pointer to a DWARF information entry, figure out if we need 21350 to make a symbol table entry for it, and if so, create a new entry 21351 and return a pointer to it. 21352 If TYPE is NULL, determine symbol type from the die, otherwise 21353 used the passed type. 21354 If SPACE is not NULL, use it to hold the new symbol. If it is 21355 NULL, allocate a new symbol on the objfile's obstack. */ 21356 21357 static struct symbol * 21358 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu, 21359 struct symbol *space) 21360 { 21361 dwarf2_per_objfile *per_objfile = cu->per_objfile; 21362 struct objfile *objfile = per_objfile->objfile; 21363 struct gdbarch *gdbarch = objfile->arch (); 21364 struct symbol *sym = NULL; 21365 const char *name; 21366 struct attribute *attr = NULL; 21367 struct attribute *attr2 = NULL; 21368 CORE_ADDR baseaddr; 21369 struct pending **list_to_add = NULL; 21370 21371 int inlined_func = (die->tag == DW_TAG_inlined_subroutine); 21372 21373 baseaddr = objfile->text_section_offset (); 21374 21375 name = dwarf2_name (die, cu); 21376 if (name) 21377 { 21378 int suppress_add = 0; 21379 21380 if (space) 21381 sym = space; 21382 else 21383 sym = new (&objfile->objfile_obstack) symbol; 21384 OBJSTAT (objfile, n_syms++); 21385 21386 /* Cache this symbol's name and the name's demangled form (if any). */ 21387 sym->set_language (cu->language, &objfile->objfile_obstack); 21388 /* Fortran does not have mangling standard and the mangling does differ 21389 between gfortran, iFort etc. */ 21390 const char *physname 21391 = (cu->language == language_fortran 21392 ? dwarf2_full_name (name, die, cu) 21393 : dwarf2_physname (name, die, cu)); 21394 const char *linkagename = dw2_linkage_name (die, cu); 21395 21396 if (linkagename == nullptr || cu->language == language_ada) 21397 sym->set_linkage_name (physname); 21398 else 21399 { 21400 sym->set_demangled_name (physname, &objfile->objfile_obstack); 21401 sym->set_linkage_name (linkagename); 21402 } 21403 21404 /* Default assumptions. 21405 Use the passed type or decode it from the die. */ 21406 SYMBOL_DOMAIN (sym) = VAR_DOMAIN; 21407 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT; 21408 if (type != NULL) 21409 SYMBOL_TYPE (sym) = type; 21410 else 21411 SYMBOL_TYPE (sym) = die_type (die, cu); 21412 attr = dwarf2_attr (die, 21413 inlined_func ? DW_AT_call_line : DW_AT_decl_line, 21414 cu); 21415 if (attr != nullptr) 21416 { 21417 SYMBOL_LINE (sym) = DW_UNSND (attr); 21418 } 21419 21420 attr = dwarf2_attr (die, 21421 inlined_func ? DW_AT_call_file : DW_AT_decl_file, 21422 cu); 21423 if (attr != nullptr) 21424 { 21425 file_name_index file_index = (file_name_index) DW_UNSND (attr); 21426 struct file_entry *fe; 21427 21428 if (cu->line_header != NULL) 21429 fe = cu->line_header->file_name_at (file_index); 21430 else 21431 fe = NULL; 21432 21433 if (fe == NULL) 21434 complaint (_("file index out of range")); 21435 else 21436 symbol_set_symtab (sym, fe->symtab); 21437 } 21438 21439 switch (die->tag) 21440 { 21441 case DW_TAG_label: 21442 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 21443 if (attr != nullptr) 21444 { 21445 CORE_ADDR addr; 21446 21447 addr = attr->value_as_address (); 21448 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr); 21449 SET_SYMBOL_VALUE_ADDRESS (sym, addr); 21450 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL; 21451 } 21452 else 21453 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT; 21454 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr; 21455 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN; 21456 add_symbol_to_list (sym, cu->list_in_scope); 21457 break; 21458 case DW_TAG_subprogram: 21459 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by 21460 finish_block. */ 21461 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK; 21462 attr2 = dwarf2_attr (die, DW_AT_external, cu); 21463 if ((attr2 && (DW_UNSND (attr2) != 0)) 21464 || cu->language == language_ada 21465 || cu->language == language_fortran) 21466 { 21467 /* Subprograms marked external are stored as a global symbol. 21468 Ada and Fortran subprograms, whether marked external or 21469 not, are always stored as a global symbol, because we want 21470 to be able to access them globally. For instance, we want 21471 to be able to break on a nested subprogram without having 21472 to specify the context. */ 21473 list_to_add = cu->get_builder ()->get_global_symbols (); 21474 } 21475 else 21476 { 21477 list_to_add = cu->list_in_scope; 21478 } 21479 break; 21480 case DW_TAG_inlined_subroutine: 21481 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by 21482 finish_block. */ 21483 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK; 21484 SYMBOL_INLINED (sym) = 1; 21485 list_to_add = cu->list_in_scope; 21486 break; 21487 case DW_TAG_template_value_param: 21488 suppress_add = 1; 21489 /* Fall through. */ 21490 case DW_TAG_constant: 21491 case DW_TAG_variable: 21492 case DW_TAG_member: 21493 /* Compilation with minimal debug info may result in 21494 variables with missing type entries. Change the 21495 misleading `void' type to something sensible. */ 21496 if (SYMBOL_TYPE (sym)->code () == TYPE_CODE_VOID) 21497 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int; 21498 21499 attr = dwarf2_attr (die, DW_AT_const_value, cu); 21500 /* In the case of DW_TAG_member, we should only be called for 21501 static const members. */ 21502 if (die->tag == DW_TAG_member) 21503 { 21504 /* dwarf2_add_field uses die_is_declaration, 21505 so we do the same. */ 21506 gdb_assert (die_is_declaration (die, cu)); 21507 gdb_assert (attr); 21508 } 21509 if (attr != nullptr) 21510 { 21511 dwarf2_const_value (attr, sym, cu); 21512 attr2 = dwarf2_attr (die, DW_AT_external, cu); 21513 if (!suppress_add) 21514 { 21515 if (attr2 && (DW_UNSND (attr2) != 0)) 21516 list_to_add = cu->get_builder ()->get_global_symbols (); 21517 else 21518 list_to_add = cu->list_in_scope; 21519 } 21520 break; 21521 } 21522 attr = dwarf2_attr (die, DW_AT_location, cu); 21523 if (attr != nullptr) 21524 { 21525 var_decode_location (attr, sym, cu); 21526 attr2 = dwarf2_attr (die, DW_AT_external, cu); 21527 21528 /* Fortran explicitly imports any global symbols to the local 21529 scope by DW_TAG_common_block. */ 21530 if (cu->language == language_fortran && die->parent 21531 && die->parent->tag == DW_TAG_common_block) 21532 attr2 = NULL; 21533 21534 if (SYMBOL_CLASS (sym) == LOC_STATIC 21535 && SYMBOL_VALUE_ADDRESS (sym) == 0 21536 && !per_objfile->per_bfd->has_section_at_zero) 21537 { 21538 /* When a static variable is eliminated by the linker, 21539 the corresponding debug information is not stripped 21540 out, but the variable address is set to null; 21541 do not add such variables into symbol table. */ 21542 } 21543 else if (attr2 && (DW_UNSND (attr2) != 0)) 21544 { 21545 if (SYMBOL_CLASS (sym) == LOC_STATIC 21546 && (objfile->flags & OBJF_MAINLINE) == 0 21547 && per_objfile->per_bfd->can_copy) 21548 { 21549 /* A global static variable might be subject to 21550 copy relocation. We first check for a local 21551 minsym, though, because maybe the symbol was 21552 marked hidden, in which case this would not 21553 apply. */ 21554 bound_minimal_symbol found 21555 = (lookup_minimal_symbol_linkage 21556 (sym->linkage_name (), objfile)); 21557 if (found.minsym != nullptr) 21558 sym->maybe_copied = 1; 21559 } 21560 21561 /* A variable with DW_AT_external is never static, 21562 but it may be block-scoped. */ 21563 list_to_add 21564 = ((cu->list_in_scope 21565 == cu->get_builder ()->get_file_symbols ()) 21566 ? cu->get_builder ()->get_global_symbols () 21567 : cu->list_in_scope); 21568 } 21569 else 21570 list_to_add = cu->list_in_scope; 21571 } 21572 else 21573 { 21574 /* We do not know the address of this symbol. 21575 If it is an external symbol and we have type information 21576 for it, enter the symbol as a LOC_UNRESOLVED symbol. 21577 The address of the variable will then be determined from 21578 the minimal symbol table whenever the variable is 21579 referenced. */ 21580 attr2 = dwarf2_attr (die, DW_AT_external, cu); 21581 21582 /* Fortran explicitly imports any global symbols to the local 21583 scope by DW_TAG_common_block. */ 21584 if (cu->language == language_fortran && die->parent 21585 && die->parent->tag == DW_TAG_common_block) 21586 { 21587 /* SYMBOL_CLASS doesn't matter here because 21588 read_common_block is going to reset it. */ 21589 if (!suppress_add) 21590 list_to_add = cu->list_in_scope; 21591 } 21592 else if (attr2 && (DW_UNSND (attr2) != 0) 21593 && dwarf2_attr (die, DW_AT_type, cu) != NULL) 21594 { 21595 /* A variable with DW_AT_external is never static, but it 21596 may be block-scoped. */ 21597 list_to_add 21598 = ((cu->list_in_scope 21599 == cu->get_builder ()->get_file_symbols ()) 21600 ? cu->get_builder ()->get_global_symbols () 21601 : cu->list_in_scope); 21602 21603 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED; 21604 } 21605 else if (!die_is_declaration (die, cu)) 21606 { 21607 /* Use the default LOC_OPTIMIZED_OUT class. */ 21608 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT); 21609 if (!suppress_add) 21610 list_to_add = cu->list_in_scope; 21611 } 21612 } 21613 break; 21614 case DW_TAG_formal_parameter: 21615 { 21616 /* If we are inside a function, mark this as an argument. If 21617 not, we might be looking at an argument to an inlined function 21618 when we do not have enough information to show inlined frames; 21619 pretend it's a local variable in that case so that the user can 21620 still see it. */ 21621 struct context_stack *curr 21622 = cu->get_builder ()->get_current_context_stack (); 21623 if (curr != nullptr && curr->name != nullptr) 21624 SYMBOL_IS_ARGUMENT (sym) = 1; 21625 attr = dwarf2_attr (die, DW_AT_location, cu); 21626 if (attr != nullptr) 21627 { 21628 var_decode_location (attr, sym, cu); 21629 } 21630 attr = dwarf2_attr (die, DW_AT_const_value, cu); 21631 if (attr != nullptr) 21632 { 21633 dwarf2_const_value (attr, sym, cu); 21634 } 21635 21636 list_to_add = cu->list_in_scope; 21637 } 21638 break; 21639 case DW_TAG_unspecified_parameters: 21640 /* From varargs functions; gdb doesn't seem to have any 21641 interest in this information, so just ignore it for now. 21642 (FIXME?) */ 21643 break; 21644 case DW_TAG_template_type_param: 21645 suppress_add = 1; 21646 /* Fall through. */ 21647 case DW_TAG_class_type: 21648 case DW_TAG_interface_type: 21649 case DW_TAG_structure_type: 21650 case DW_TAG_union_type: 21651 case DW_TAG_set_type: 21652 case DW_TAG_enumeration_type: 21653 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; 21654 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; 21655 21656 { 21657 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't 21658 really ever be static objects: otherwise, if you try 21659 to, say, break of a class's method and you're in a file 21660 which doesn't mention that class, it won't work unless 21661 the check for all static symbols in lookup_symbol_aux 21662 saves you. See the OtherFileClass tests in 21663 gdb.c++/namespace.exp. */ 21664 21665 if (!suppress_add) 21666 { 21667 buildsym_compunit *builder = cu->get_builder (); 21668 list_to_add 21669 = (cu->list_in_scope == builder->get_file_symbols () 21670 && cu->language == language_cplus 21671 ? builder->get_global_symbols () 21672 : cu->list_in_scope); 21673 21674 /* The semantics of C++ state that "struct foo { 21675 ... }" also defines a typedef for "foo". */ 21676 if (cu->language == language_cplus 21677 || cu->language == language_ada 21678 || cu->language == language_d 21679 || cu->language == language_rust) 21680 { 21681 /* The symbol's name is already allocated along 21682 with this objfile, so we don't need to 21683 duplicate it for the type. */ 21684 if (SYMBOL_TYPE (sym)->name () == 0) 21685 SYMBOL_TYPE (sym)->set_name (sym->search_name ()); 21686 } 21687 } 21688 } 21689 break; 21690 case DW_TAG_typedef: 21691 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; 21692 SYMBOL_DOMAIN (sym) = VAR_DOMAIN; 21693 list_to_add = cu->list_in_scope; 21694 break; 21695 case DW_TAG_base_type: 21696 case DW_TAG_subrange_type: 21697 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; 21698 SYMBOL_DOMAIN (sym) = VAR_DOMAIN; 21699 list_to_add = cu->list_in_scope; 21700 break; 21701 case DW_TAG_enumerator: 21702 attr = dwarf2_attr (die, DW_AT_const_value, cu); 21703 if (attr != nullptr) 21704 { 21705 dwarf2_const_value (attr, sym, cu); 21706 } 21707 { 21708 /* NOTE: carlton/2003-11-10: See comment above in the 21709 DW_TAG_class_type, etc. block. */ 21710 21711 list_to_add 21712 = (cu->list_in_scope == cu->get_builder ()->get_file_symbols () 21713 && cu->language == language_cplus 21714 ? cu->get_builder ()->get_global_symbols () 21715 : cu->list_in_scope); 21716 } 21717 break; 21718 case DW_TAG_imported_declaration: 21719 case DW_TAG_namespace: 21720 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; 21721 list_to_add = cu->get_builder ()->get_global_symbols (); 21722 break; 21723 case DW_TAG_module: 21724 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; 21725 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN; 21726 list_to_add = cu->get_builder ()->get_global_symbols (); 21727 break; 21728 case DW_TAG_common_block: 21729 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK; 21730 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN; 21731 add_symbol_to_list (sym, cu->list_in_scope); 21732 break; 21733 default: 21734 /* Not a tag we recognize. Hopefully we aren't processing 21735 trash data, but since we must specifically ignore things 21736 we don't recognize, there is nothing else we should do at 21737 this point. */ 21738 complaint (_("unsupported tag: '%s'"), 21739 dwarf_tag_name (die->tag)); 21740 break; 21741 } 21742 21743 if (suppress_add) 21744 { 21745 sym->hash_next = objfile->template_symbols; 21746 objfile->template_symbols = sym; 21747 list_to_add = NULL; 21748 } 21749 21750 if (list_to_add != NULL) 21751 add_symbol_to_list (sym, list_to_add); 21752 21753 /* For the benefit of old versions of GCC, check for anonymous 21754 namespaces based on the demangled name. */ 21755 if (!cu->processing_has_namespace_info 21756 && cu->language == language_cplus) 21757 cp_scan_for_anonymous_namespaces (cu->get_builder (), sym, objfile); 21758 } 21759 return (sym); 21760 } 21761 21762 /* Given an attr with a DW_FORM_dataN value in host byte order, 21763 zero-extend it as appropriate for the symbol's type. The DWARF 21764 standard (v4) is not entirely clear about the meaning of using 21765 DW_FORM_dataN for a constant with a signed type, where the type is 21766 wider than the data. The conclusion of a discussion on the DWARF 21767 list was that this is unspecified. We choose to always zero-extend 21768 because that is the interpretation long in use by GCC. */ 21769 21770 static gdb_byte * 21771 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack, 21772 struct dwarf2_cu *cu, LONGEST *value, int bits) 21773 { 21774 struct objfile *objfile = cu->per_objfile->objfile; 21775 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ? 21776 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE; 21777 LONGEST l = DW_UNSND (attr); 21778 21779 if (bits < sizeof (*value) * 8) 21780 { 21781 l &= ((LONGEST) 1 << bits) - 1; 21782 *value = l; 21783 } 21784 else if (bits == sizeof (*value) * 8) 21785 *value = l; 21786 else 21787 { 21788 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8); 21789 store_unsigned_integer (bytes, bits / 8, byte_order, l); 21790 return bytes; 21791 } 21792 21793 return NULL; 21794 } 21795 21796 /* Read a constant value from an attribute. Either set *VALUE, or if 21797 the value does not fit in *VALUE, set *BYTES - either already 21798 allocated on the objfile obstack, or newly allocated on OBSTACK, 21799 or, set *BATON, if we translated the constant to a location 21800 expression. */ 21801 21802 static void 21803 dwarf2_const_value_attr (const struct attribute *attr, struct type *type, 21804 const char *name, struct obstack *obstack, 21805 struct dwarf2_cu *cu, 21806 LONGEST *value, const gdb_byte **bytes, 21807 struct dwarf2_locexpr_baton **baton) 21808 { 21809 dwarf2_per_objfile *per_objfile = cu->per_objfile; 21810 struct objfile *objfile = per_objfile->objfile; 21811 struct comp_unit_head *cu_header = &cu->header; 21812 struct dwarf_block *blk; 21813 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ? 21814 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE); 21815 21816 *value = 0; 21817 *bytes = NULL; 21818 *baton = NULL; 21819 21820 switch (attr->form) 21821 { 21822 case DW_FORM_addr: 21823 case DW_FORM_addrx: 21824 case DW_FORM_GNU_addr_index: 21825 { 21826 gdb_byte *data; 21827 21828 if (TYPE_LENGTH (type) != cu_header->addr_size) 21829 dwarf2_const_value_length_mismatch_complaint (name, 21830 cu_header->addr_size, 21831 TYPE_LENGTH (type)); 21832 /* Symbols of this form are reasonably rare, so we just 21833 piggyback on the existing location code rather than writing 21834 a new implementation of symbol_computed_ops. */ 21835 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton); 21836 (*baton)->per_objfile = per_objfile; 21837 (*baton)->per_cu = cu->per_cu; 21838 gdb_assert ((*baton)->per_cu); 21839 21840 (*baton)->size = 2 + cu_header->addr_size; 21841 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size); 21842 (*baton)->data = data; 21843 21844 data[0] = DW_OP_addr; 21845 store_unsigned_integer (&data[1], cu_header->addr_size, 21846 byte_order, DW_ADDR (attr)); 21847 data[cu_header->addr_size + 1] = DW_OP_stack_value; 21848 } 21849 break; 21850 case DW_FORM_string: 21851 case DW_FORM_strp: 21852 case DW_FORM_strx: 21853 case DW_FORM_GNU_str_index: 21854 case DW_FORM_GNU_strp_alt: 21855 /* DW_STRING is already allocated on the objfile obstack, point 21856 directly to it. */ 21857 *bytes = (const gdb_byte *) DW_STRING (attr); 21858 break; 21859 case DW_FORM_block1: 21860 case DW_FORM_block2: 21861 case DW_FORM_block4: 21862 case DW_FORM_block: 21863 case DW_FORM_exprloc: 21864 case DW_FORM_data16: 21865 blk = DW_BLOCK (attr); 21866 if (TYPE_LENGTH (type) != blk->size) 21867 dwarf2_const_value_length_mismatch_complaint (name, blk->size, 21868 TYPE_LENGTH (type)); 21869 *bytes = blk->data; 21870 break; 21871 21872 /* The DW_AT_const_value attributes are supposed to carry the 21873 symbol's value "represented as it would be on the target 21874 architecture." By the time we get here, it's already been 21875 converted to host endianness, so we just need to sign- or 21876 zero-extend it as appropriate. */ 21877 case DW_FORM_data1: 21878 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8); 21879 break; 21880 case DW_FORM_data2: 21881 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16); 21882 break; 21883 case DW_FORM_data4: 21884 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32); 21885 break; 21886 case DW_FORM_data8: 21887 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64); 21888 break; 21889 21890 case DW_FORM_sdata: 21891 case DW_FORM_implicit_const: 21892 *value = DW_SND (attr); 21893 break; 21894 21895 case DW_FORM_udata: 21896 *value = DW_UNSND (attr); 21897 break; 21898 21899 default: 21900 complaint (_("unsupported const value attribute form: '%s'"), 21901 dwarf_form_name (attr->form)); 21902 *value = 0; 21903 break; 21904 } 21905 } 21906 21907 21908 /* Copy constant value from an attribute to a symbol. */ 21909 21910 static void 21911 dwarf2_const_value (const struct attribute *attr, struct symbol *sym, 21912 struct dwarf2_cu *cu) 21913 { 21914 struct objfile *objfile = cu->per_objfile->objfile; 21915 LONGEST value; 21916 const gdb_byte *bytes; 21917 struct dwarf2_locexpr_baton *baton; 21918 21919 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym), 21920 sym->print_name (), 21921 &objfile->objfile_obstack, cu, 21922 &value, &bytes, &baton); 21923 21924 if (baton != NULL) 21925 { 21926 SYMBOL_LOCATION_BATON (sym) = baton; 21927 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index; 21928 } 21929 else if (bytes != NULL) 21930 { 21931 SYMBOL_VALUE_BYTES (sym) = bytes; 21932 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES; 21933 } 21934 else 21935 { 21936 SYMBOL_VALUE (sym) = value; 21937 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST; 21938 } 21939 } 21940 21941 /* Return the type of the die in question using its DW_AT_type attribute. */ 21942 21943 static struct type * 21944 die_type (struct die_info *die, struct dwarf2_cu *cu) 21945 { 21946 struct attribute *type_attr; 21947 21948 type_attr = dwarf2_attr (die, DW_AT_type, cu); 21949 if (!type_attr) 21950 { 21951 struct objfile *objfile = cu->per_objfile->objfile; 21952 /* A missing DW_AT_type represents a void type. */ 21953 return objfile_type (objfile)->builtin_void; 21954 } 21955 21956 return lookup_die_type (die, type_attr, cu); 21957 } 21958 21959 /* True iff CU's producer generates GNAT Ada auxiliary information 21960 that allows to find parallel types through that information instead 21961 of having to do expensive parallel lookups by type name. */ 21962 21963 static int 21964 need_gnat_info (struct dwarf2_cu *cu) 21965 { 21966 /* Assume that the Ada compiler was GNAT, which always produces 21967 the auxiliary information. */ 21968 return (cu->language == language_ada); 21969 } 21970 21971 /* Return the auxiliary type of the die in question using its 21972 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the 21973 attribute is not present. */ 21974 21975 static struct type * 21976 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu) 21977 { 21978 struct attribute *type_attr; 21979 21980 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu); 21981 if (!type_attr) 21982 return NULL; 21983 21984 return lookup_die_type (die, type_attr, cu); 21985 } 21986 21987 /* If DIE has a descriptive_type attribute, then set the TYPE's 21988 descriptive type accordingly. */ 21989 21990 static void 21991 set_descriptive_type (struct type *type, struct die_info *die, 21992 struct dwarf2_cu *cu) 21993 { 21994 struct type *descriptive_type = die_descriptive_type (die, cu); 21995 21996 if (descriptive_type) 21997 { 21998 ALLOCATE_GNAT_AUX_TYPE (type); 21999 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type; 22000 } 22001 } 22002 22003 /* Return the containing type of the die in question using its 22004 DW_AT_containing_type attribute. */ 22005 22006 static struct type * 22007 die_containing_type (struct die_info *die, struct dwarf2_cu *cu) 22008 { 22009 struct attribute *type_attr; 22010 struct objfile *objfile = cu->per_objfile->objfile; 22011 22012 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu); 22013 if (!type_attr) 22014 error (_("Dwarf Error: Problem turning containing type into gdb type " 22015 "[in module %s]"), objfile_name (objfile)); 22016 22017 return lookup_die_type (die, type_attr, cu); 22018 } 22019 22020 /* Return an error marker type to use for the ill formed type in DIE/CU. */ 22021 22022 static struct type * 22023 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die) 22024 { 22025 dwarf2_per_objfile *per_objfile = cu->per_objfile; 22026 struct objfile *objfile = per_objfile->objfile; 22027 char *saved; 22028 22029 std::string message 22030 = string_printf (_("<unknown type in %s, CU %s, DIE %s>"), 22031 objfile_name (objfile), 22032 sect_offset_str (cu->header.sect_off), 22033 sect_offset_str (die->sect_off)); 22034 saved = obstack_strdup (&objfile->objfile_obstack, message); 22035 22036 return init_type (objfile, TYPE_CODE_ERROR, 0, saved); 22037 } 22038 22039 /* Look up the type of DIE in CU using its type attribute ATTR. 22040 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type, 22041 DW_AT_containing_type. 22042 If there is no type substitute an error marker. */ 22043 22044 static struct type * 22045 lookup_die_type (struct die_info *die, const struct attribute *attr, 22046 struct dwarf2_cu *cu) 22047 { 22048 dwarf2_per_objfile *per_objfile = cu->per_objfile; 22049 struct objfile *objfile = per_objfile->objfile; 22050 struct type *this_type; 22051 22052 gdb_assert (attr->name == DW_AT_type 22053 || attr->name == DW_AT_GNAT_descriptive_type 22054 || attr->name == DW_AT_containing_type); 22055 22056 /* First see if we have it cached. */ 22057 22058 if (attr->form == DW_FORM_GNU_ref_alt) 22059 { 22060 struct dwarf2_per_cu_data *per_cu; 22061 sect_offset sect_off = attr->get_ref_die_offset (); 22062 22063 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, per_objfile); 22064 this_type = get_die_type_at_offset (sect_off, per_cu, per_objfile); 22065 } 22066 else if (attr->form_is_ref ()) 22067 { 22068 sect_offset sect_off = attr->get_ref_die_offset (); 22069 22070 this_type = get_die_type_at_offset (sect_off, cu->per_cu, per_objfile); 22071 } 22072 else if (attr->form == DW_FORM_ref_sig8) 22073 { 22074 ULONGEST signature = DW_SIGNATURE (attr); 22075 22076 return get_signatured_type (die, signature, cu); 22077 } 22078 else 22079 { 22080 complaint (_("Dwarf Error: Bad type attribute %s in DIE" 22081 " at %s [in module %s]"), 22082 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off), 22083 objfile_name (objfile)); 22084 return build_error_marker_type (cu, die); 22085 } 22086 22087 /* If not cached we need to read it in. */ 22088 22089 if (this_type == NULL) 22090 { 22091 struct die_info *type_die = NULL; 22092 struct dwarf2_cu *type_cu = cu; 22093 22094 if (attr->form_is_ref ()) 22095 type_die = follow_die_ref (die, attr, &type_cu); 22096 if (type_die == NULL) 22097 return build_error_marker_type (cu, die); 22098 /* If we find the type now, it's probably because the type came 22099 from an inter-CU reference and the type's CU got expanded before 22100 ours. */ 22101 this_type = read_type_die (type_die, type_cu); 22102 } 22103 22104 /* If we still don't have a type use an error marker. */ 22105 22106 if (this_type == NULL) 22107 return build_error_marker_type (cu, die); 22108 22109 return this_type; 22110 } 22111 22112 /* Return the type in DIE, CU. 22113 Returns NULL for invalid types. 22114 22115 This first does a lookup in die_type_hash, 22116 and only reads the die in if necessary. 22117 22118 NOTE: This can be called when reading in partial or full symbols. */ 22119 22120 static struct type * 22121 read_type_die (struct die_info *die, struct dwarf2_cu *cu) 22122 { 22123 struct type *this_type; 22124 22125 this_type = get_die_type (die, cu); 22126 if (this_type) 22127 return this_type; 22128 22129 return read_type_die_1 (die, cu); 22130 } 22131 22132 /* Read the type in DIE, CU. 22133 Returns NULL for invalid types. */ 22134 22135 static struct type * 22136 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu) 22137 { 22138 struct type *this_type = NULL; 22139 22140 switch (die->tag) 22141 { 22142 case DW_TAG_class_type: 22143 case DW_TAG_interface_type: 22144 case DW_TAG_structure_type: 22145 case DW_TAG_union_type: 22146 this_type = read_structure_type (die, cu); 22147 break; 22148 case DW_TAG_enumeration_type: 22149 this_type = read_enumeration_type (die, cu); 22150 break; 22151 case DW_TAG_subprogram: 22152 case DW_TAG_subroutine_type: 22153 case DW_TAG_inlined_subroutine: 22154 this_type = read_subroutine_type (die, cu); 22155 break; 22156 case DW_TAG_array_type: 22157 this_type = read_array_type (die, cu); 22158 break; 22159 case DW_TAG_set_type: 22160 this_type = read_set_type (die, cu); 22161 break; 22162 case DW_TAG_pointer_type: 22163 this_type = read_tag_pointer_type (die, cu); 22164 break; 22165 case DW_TAG_ptr_to_member_type: 22166 this_type = read_tag_ptr_to_member_type (die, cu); 22167 break; 22168 case DW_TAG_reference_type: 22169 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF); 22170 break; 22171 case DW_TAG_rvalue_reference_type: 22172 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF); 22173 break; 22174 case DW_TAG_const_type: 22175 this_type = read_tag_const_type (die, cu); 22176 break; 22177 case DW_TAG_volatile_type: 22178 this_type = read_tag_volatile_type (die, cu); 22179 break; 22180 case DW_TAG_restrict_type: 22181 this_type = read_tag_restrict_type (die, cu); 22182 break; 22183 case DW_TAG_string_type: 22184 this_type = read_tag_string_type (die, cu); 22185 break; 22186 case DW_TAG_typedef: 22187 this_type = read_typedef (die, cu); 22188 break; 22189 case DW_TAG_subrange_type: 22190 this_type = read_subrange_type (die, cu); 22191 break; 22192 case DW_TAG_base_type: 22193 this_type = read_base_type (die, cu); 22194 break; 22195 case DW_TAG_unspecified_type: 22196 this_type = read_unspecified_type (die, cu); 22197 break; 22198 case DW_TAG_namespace: 22199 this_type = read_namespace_type (die, cu); 22200 break; 22201 case DW_TAG_module: 22202 this_type = read_module_type (die, cu); 22203 break; 22204 case DW_TAG_atomic_type: 22205 this_type = read_tag_atomic_type (die, cu); 22206 break; 22207 default: 22208 complaint (_("unexpected tag in read_type_die: '%s'"), 22209 dwarf_tag_name (die->tag)); 22210 break; 22211 } 22212 22213 return this_type; 22214 } 22215 22216 /* See if we can figure out if the class lives in a namespace. We do 22217 this by looking for a member function; its demangled name will 22218 contain namespace info, if there is any. 22219 Return the computed name or NULL. 22220 Space for the result is allocated on the objfile's obstack. 22221 This is the full-die version of guess_partial_die_structure_name. 22222 In this case we know DIE has no useful parent. */ 22223 22224 static const char * 22225 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu) 22226 { 22227 struct die_info *spec_die; 22228 struct dwarf2_cu *spec_cu; 22229 struct die_info *child; 22230 struct objfile *objfile = cu->per_objfile->objfile; 22231 22232 spec_cu = cu; 22233 spec_die = die_specification (die, &spec_cu); 22234 if (spec_die != NULL) 22235 { 22236 die = spec_die; 22237 cu = spec_cu; 22238 } 22239 22240 for (child = die->child; 22241 child != NULL; 22242 child = child->sibling) 22243 { 22244 if (child->tag == DW_TAG_subprogram) 22245 { 22246 const char *linkage_name = dw2_linkage_name (child, cu); 22247 22248 if (linkage_name != NULL) 22249 { 22250 gdb::unique_xmalloc_ptr<char> actual_name 22251 (cu->language_defn->class_name_from_physname (linkage_name)); 22252 const char *name = NULL; 22253 22254 if (actual_name != NULL) 22255 { 22256 const char *die_name = dwarf2_name (die, cu); 22257 22258 if (die_name != NULL 22259 && strcmp (die_name, actual_name.get ()) != 0) 22260 { 22261 /* Strip off the class name from the full name. 22262 We want the prefix. */ 22263 int die_name_len = strlen (die_name); 22264 int actual_name_len = strlen (actual_name.get ()); 22265 const char *ptr = actual_name.get (); 22266 22267 /* Test for '::' as a sanity check. */ 22268 if (actual_name_len > die_name_len + 2 22269 && ptr[actual_name_len - die_name_len - 1] == ':') 22270 name = obstack_strndup ( 22271 &objfile->per_bfd->storage_obstack, 22272 ptr, actual_name_len - die_name_len - 2); 22273 } 22274 } 22275 return name; 22276 } 22277 } 22278 } 22279 22280 return NULL; 22281 } 22282 22283 /* GCC might emit a nameless typedef that has a linkage name. Determine the 22284 prefix part in such case. See 22285 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ 22286 22287 static const char * 22288 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu) 22289 { 22290 struct attribute *attr; 22291 const char *base; 22292 22293 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type 22294 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type) 22295 return NULL; 22296 22297 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL) 22298 return NULL; 22299 22300 attr = dw2_linkage_name_attr (die, cu); 22301 if (attr == NULL || DW_STRING (attr) == NULL) 22302 return NULL; 22303 22304 /* dwarf2_name had to be already called. */ 22305 gdb_assert (DW_STRING_IS_CANONICAL (attr)); 22306 22307 /* Strip the base name, keep any leading namespaces/classes. */ 22308 base = strrchr (DW_STRING (attr), ':'); 22309 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':') 22310 return ""; 22311 22312 struct objfile *objfile = cu->per_objfile->objfile; 22313 return obstack_strndup (&objfile->per_bfd->storage_obstack, 22314 DW_STRING (attr), 22315 &base[-1] - DW_STRING (attr)); 22316 } 22317 22318 /* Return the name of the namespace/class that DIE is defined within, 22319 or "" if we can't tell. The caller should not xfree the result. 22320 22321 For example, if we're within the method foo() in the following 22322 code: 22323 22324 namespace N { 22325 class C { 22326 void foo () { 22327 } 22328 }; 22329 } 22330 22331 then determine_prefix on foo's die will return "N::C". */ 22332 22333 static const char * 22334 determine_prefix (struct die_info *die, struct dwarf2_cu *cu) 22335 { 22336 dwarf2_per_objfile *per_objfile = cu->per_objfile; 22337 struct die_info *parent, *spec_die; 22338 struct dwarf2_cu *spec_cu; 22339 struct type *parent_type; 22340 const char *retval; 22341 22342 if (cu->language != language_cplus 22343 && cu->language != language_fortran && cu->language != language_d 22344 && cu->language != language_rust) 22345 return ""; 22346 22347 retval = anonymous_struct_prefix (die, cu); 22348 if (retval) 22349 return retval; 22350 22351 /* We have to be careful in the presence of DW_AT_specification. 22352 For example, with GCC 3.4, given the code 22353 22354 namespace N { 22355 void foo() { 22356 // Definition of N::foo. 22357 } 22358 } 22359 22360 then we'll have a tree of DIEs like this: 22361 22362 1: DW_TAG_compile_unit 22363 2: DW_TAG_namespace // N 22364 3: DW_TAG_subprogram // declaration of N::foo 22365 4: DW_TAG_subprogram // definition of N::foo 22366 DW_AT_specification // refers to die #3 22367 22368 Thus, when processing die #4, we have to pretend that we're in 22369 the context of its DW_AT_specification, namely the contex of die 22370 #3. */ 22371 spec_cu = cu; 22372 spec_die = die_specification (die, &spec_cu); 22373 if (spec_die == NULL) 22374 parent = die->parent; 22375 else 22376 { 22377 parent = spec_die->parent; 22378 cu = spec_cu; 22379 } 22380 22381 if (parent == NULL) 22382 return ""; 22383 else if (parent->building_fullname) 22384 { 22385 const char *name; 22386 const char *parent_name; 22387 22388 /* It has been seen on RealView 2.2 built binaries, 22389 DW_TAG_template_type_param types actually _defined_ as 22390 children of the parent class: 22391 22392 enum E {}; 22393 template class <class Enum> Class{}; 22394 Class<enum E> class_e; 22395 22396 1: DW_TAG_class_type (Class) 22397 2: DW_TAG_enumeration_type (E) 22398 3: DW_TAG_enumerator (enum1:0) 22399 3: DW_TAG_enumerator (enum2:1) 22400 ... 22401 2: DW_TAG_template_type_param 22402 DW_AT_type DW_FORM_ref_udata (E) 22403 22404 Besides being broken debug info, it can put GDB into an 22405 infinite loop. Consider: 22406 22407 When we're building the full name for Class<E>, we'll start 22408 at Class, and go look over its template type parameters, 22409 finding E. We'll then try to build the full name of E, and 22410 reach here. We're now trying to build the full name of E, 22411 and look over the parent DIE for containing scope. In the 22412 broken case, if we followed the parent DIE of E, we'd again 22413 find Class, and once again go look at its template type 22414 arguments, etc., etc. Simply don't consider such parent die 22415 as source-level parent of this die (it can't be, the language 22416 doesn't allow it), and break the loop here. */ 22417 name = dwarf2_name (die, cu); 22418 parent_name = dwarf2_name (parent, cu); 22419 complaint (_("template param type '%s' defined within parent '%s'"), 22420 name ? name : "<unknown>", 22421 parent_name ? parent_name : "<unknown>"); 22422 return ""; 22423 } 22424 else 22425 switch (parent->tag) 22426 { 22427 case DW_TAG_namespace: 22428 parent_type = read_type_die (parent, cu); 22429 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus 22430 DW_TAG_namespace DIEs with a name of "::" for the global namespace. 22431 Work around this problem here. */ 22432 if (cu->language == language_cplus 22433 && strcmp (parent_type->name (), "::") == 0) 22434 return ""; 22435 /* We give a name to even anonymous namespaces. */ 22436 return parent_type->name (); 22437 case DW_TAG_class_type: 22438 case DW_TAG_interface_type: 22439 case DW_TAG_structure_type: 22440 case DW_TAG_union_type: 22441 case DW_TAG_module: 22442 parent_type = read_type_die (parent, cu); 22443 if (parent_type->name () != NULL) 22444 return parent_type->name (); 22445 else 22446 /* An anonymous structure is only allowed non-static data 22447 members; no typedefs, no member functions, et cetera. 22448 So it does not need a prefix. */ 22449 return ""; 22450 case DW_TAG_compile_unit: 22451 case DW_TAG_partial_unit: 22452 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */ 22453 if (cu->language == language_cplus 22454 && !per_objfile->per_bfd->types.empty () 22455 && die->child != NULL 22456 && (die->tag == DW_TAG_class_type 22457 || die->tag == DW_TAG_structure_type 22458 || die->tag == DW_TAG_union_type)) 22459 { 22460 const char *name = guess_full_die_structure_name (die, cu); 22461 if (name != NULL) 22462 return name; 22463 } 22464 return ""; 22465 case DW_TAG_subprogram: 22466 /* Nested subroutines in Fortran get a prefix with the name 22467 of the parent's subroutine. */ 22468 if (cu->language == language_fortran) 22469 { 22470 if ((die->tag == DW_TAG_subprogram) 22471 && (dwarf2_name (parent, cu) != NULL)) 22472 return dwarf2_name (parent, cu); 22473 } 22474 return determine_prefix (parent, cu); 22475 case DW_TAG_enumeration_type: 22476 parent_type = read_type_die (parent, cu); 22477 if (TYPE_DECLARED_CLASS (parent_type)) 22478 { 22479 if (parent_type->name () != NULL) 22480 return parent_type->name (); 22481 return ""; 22482 } 22483 /* Fall through. */ 22484 default: 22485 return determine_prefix (parent, cu); 22486 } 22487 } 22488 22489 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX 22490 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then 22491 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform 22492 an obconcat, otherwise allocate storage for the result. The CU argument is 22493 used to determine the language and hence, the appropriate separator. */ 22494 22495 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */ 22496 22497 static char * 22498 typename_concat (struct obstack *obs, const char *prefix, const char *suffix, 22499 int physname, struct dwarf2_cu *cu) 22500 { 22501 const char *lead = ""; 22502 const char *sep; 22503 22504 if (suffix == NULL || suffix[0] == '\0' 22505 || prefix == NULL || prefix[0] == '\0') 22506 sep = ""; 22507 else if (cu->language == language_d) 22508 { 22509 /* For D, the 'main' function could be defined in any module, but it 22510 should never be prefixed. */ 22511 if (strcmp (suffix, "D main") == 0) 22512 { 22513 prefix = ""; 22514 sep = ""; 22515 } 22516 else 22517 sep = "."; 22518 } 22519 else if (cu->language == language_fortran && physname) 22520 { 22521 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or 22522 DW_AT_MIPS_linkage_name is preferred and used instead. */ 22523 22524 lead = "__"; 22525 sep = "_MOD_"; 22526 } 22527 else 22528 sep = "::"; 22529 22530 if (prefix == NULL) 22531 prefix = ""; 22532 if (suffix == NULL) 22533 suffix = ""; 22534 22535 if (obs == NULL) 22536 { 22537 char *retval 22538 = ((char *) 22539 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1)); 22540 22541 strcpy (retval, lead); 22542 strcat (retval, prefix); 22543 strcat (retval, sep); 22544 strcat (retval, suffix); 22545 return retval; 22546 } 22547 else 22548 { 22549 /* We have an obstack. */ 22550 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL); 22551 } 22552 } 22553 22554 /* Get name of a die, return NULL if not found. */ 22555 22556 static const char * 22557 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu, 22558 struct objfile *objfile) 22559 { 22560 if (name && cu->language == language_cplus) 22561 { 22562 gdb::unique_xmalloc_ptr<char> canon_name 22563 = cp_canonicalize_string (name); 22564 22565 if (canon_name != nullptr) 22566 name = objfile->intern (canon_name.get ()); 22567 } 22568 22569 return name; 22570 } 22571 22572 /* Get name of a die, return NULL if not found. 22573 Anonymous namespaces are converted to their magic string. */ 22574 22575 static const char * 22576 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu) 22577 { 22578 struct attribute *attr; 22579 struct objfile *objfile = cu->per_objfile->objfile; 22580 22581 attr = dwarf2_attr (die, DW_AT_name, cu); 22582 if ((!attr || !DW_STRING (attr)) 22583 && die->tag != DW_TAG_namespace 22584 && die->tag != DW_TAG_class_type 22585 && die->tag != DW_TAG_interface_type 22586 && die->tag != DW_TAG_structure_type 22587 && die->tag != DW_TAG_union_type) 22588 return NULL; 22589 22590 switch (die->tag) 22591 { 22592 case DW_TAG_compile_unit: 22593 case DW_TAG_partial_unit: 22594 /* Compilation units have a DW_AT_name that is a filename, not 22595 a source language identifier. */ 22596 case DW_TAG_enumeration_type: 22597 case DW_TAG_enumerator: 22598 /* These tags always have simple identifiers already; no need 22599 to canonicalize them. */ 22600 return DW_STRING (attr); 22601 22602 case DW_TAG_namespace: 22603 if (attr != NULL && DW_STRING (attr) != NULL) 22604 return DW_STRING (attr); 22605 return CP_ANONYMOUS_NAMESPACE_STR; 22606 22607 case DW_TAG_class_type: 22608 case DW_TAG_interface_type: 22609 case DW_TAG_structure_type: 22610 case DW_TAG_union_type: 22611 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed 22612 structures or unions. These were of the form "._%d" in GCC 4.1, 22613 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3 22614 and GCC 4.4. We work around this problem by ignoring these. */ 22615 if (attr && DW_STRING (attr) 22616 && (startswith (DW_STRING (attr), "._") 22617 || startswith (DW_STRING (attr), "<anonymous"))) 22618 return NULL; 22619 22620 /* GCC might emit a nameless typedef that has a linkage name. See 22621 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ 22622 if (!attr || DW_STRING (attr) == NULL) 22623 { 22624 attr = dw2_linkage_name_attr (die, cu); 22625 if (attr == NULL || DW_STRING (attr) == NULL) 22626 return NULL; 22627 22628 /* Avoid demangling DW_STRING (attr) the second time on a second 22629 call for the same DIE. */ 22630 if (!DW_STRING_IS_CANONICAL (attr)) 22631 { 22632 gdb::unique_xmalloc_ptr<char> demangled 22633 (gdb_demangle (DW_STRING (attr), DMGL_TYPES)); 22634 if (demangled == nullptr) 22635 return nullptr; 22636 22637 DW_STRING (attr) = objfile->intern (demangled.get ()); 22638 DW_STRING_IS_CANONICAL (attr) = 1; 22639 } 22640 22641 /* Strip any leading namespaces/classes, keep only the base name. 22642 DW_AT_name for named DIEs does not contain the prefixes. */ 22643 const char *base = strrchr (DW_STRING (attr), ':'); 22644 if (base && base > DW_STRING (attr) && base[-1] == ':') 22645 return &base[1]; 22646 else 22647 return DW_STRING (attr); 22648 } 22649 break; 22650 22651 default: 22652 break; 22653 } 22654 22655 if (!DW_STRING_IS_CANONICAL (attr)) 22656 { 22657 DW_STRING (attr) = dwarf2_canonicalize_name (DW_STRING (attr), cu, 22658 objfile); 22659 DW_STRING_IS_CANONICAL (attr) = 1; 22660 } 22661 return DW_STRING (attr); 22662 } 22663 22664 /* Return the die that this die in an extension of, or NULL if there 22665 is none. *EXT_CU is the CU containing DIE on input, and the CU 22666 containing the return value on output. */ 22667 22668 static struct die_info * 22669 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu) 22670 { 22671 struct attribute *attr; 22672 22673 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu); 22674 if (attr == NULL) 22675 return NULL; 22676 22677 return follow_die_ref (die, attr, ext_cu); 22678 } 22679 22680 static void 22681 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die) 22682 { 22683 unsigned int i; 22684 22685 print_spaces (indent, f); 22686 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n", 22687 dwarf_tag_name (die->tag), die->abbrev, 22688 sect_offset_str (die->sect_off)); 22689 22690 if (die->parent != NULL) 22691 { 22692 print_spaces (indent, f); 22693 fprintf_unfiltered (f, " parent at offset: %s\n", 22694 sect_offset_str (die->parent->sect_off)); 22695 } 22696 22697 print_spaces (indent, f); 22698 fprintf_unfiltered (f, " has children: %s\n", 22699 dwarf_bool_name (die->child != NULL)); 22700 22701 print_spaces (indent, f); 22702 fprintf_unfiltered (f, " attributes:\n"); 22703 22704 for (i = 0; i < die->num_attrs; ++i) 22705 { 22706 print_spaces (indent, f); 22707 fprintf_unfiltered (f, " %s (%s) ", 22708 dwarf_attr_name (die->attrs[i].name), 22709 dwarf_form_name (die->attrs[i].form)); 22710 22711 switch (die->attrs[i].form) 22712 { 22713 case DW_FORM_addr: 22714 case DW_FORM_addrx: 22715 case DW_FORM_GNU_addr_index: 22716 fprintf_unfiltered (f, "address: "); 22717 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f); 22718 break; 22719 case DW_FORM_block2: 22720 case DW_FORM_block4: 22721 case DW_FORM_block: 22722 case DW_FORM_block1: 22723 fprintf_unfiltered (f, "block: size %s", 22724 pulongest (DW_BLOCK (&die->attrs[i])->size)); 22725 break; 22726 case DW_FORM_exprloc: 22727 fprintf_unfiltered (f, "expression: size %s", 22728 pulongest (DW_BLOCK (&die->attrs[i])->size)); 22729 break; 22730 case DW_FORM_data16: 22731 fprintf_unfiltered (f, "constant of 16 bytes"); 22732 break; 22733 case DW_FORM_ref_addr: 22734 fprintf_unfiltered (f, "ref address: "); 22735 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f); 22736 break; 22737 case DW_FORM_GNU_ref_alt: 22738 fprintf_unfiltered (f, "alt ref address: "); 22739 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f); 22740 break; 22741 case DW_FORM_ref1: 22742 case DW_FORM_ref2: 22743 case DW_FORM_ref4: 22744 case DW_FORM_ref8: 22745 case DW_FORM_ref_udata: 22746 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)", 22747 (long) (DW_UNSND (&die->attrs[i]))); 22748 break; 22749 case DW_FORM_data1: 22750 case DW_FORM_data2: 22751 case DW_FORM_data4: 22752 case DW_FORM_data8: 22753 case DW_FORM_udata: 22754 case DW_FORM_sdata: 22755 fprintf_unfiltered (f, "constant: %s", 22756 pulongest (DW_UNSND (&die->attrs[i]))); 22757 break; 22758 case DW_FORM_sec_offset: 22759 fprintf_unfiltered (f, "section offset: %s", 22760 pulongest (DW_UNSND (&die->attrs[i]))); 22761 break; 22762 case DW_FORM_ref_sig8: 22763 fprintf_unfiltered (f, "signature: %s", 22764 hex_string (DW_SIGNATURE (&die->attrs[i]))); 22765 break; 22766 case DW_FORM_string: 22767 case DW_FORM_strp: 22768 case DW_FORM_line_strp: 22769 case DW_FORM_strx: 22770 case DW_FORM_GNU_str_index: 22771 case DW_FORM_GNU_strp_alt: 22772 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)", 22773 DW_STRING (&die->attrs[i]) 22774 ? DW_STRING (&die->attrs[i]) : "", 22775 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not"); 22776 break; 22777 case DW_FORM_flag: 22778 if (DW_UNSND (&die->attrs[i])) 22779 fprintf_unfiltered (f, "flag: TRUE"); 22780 else 22781 fprintf_unfiltered (f, "flag: FALSE"); 22782 break; 22783 case DW_FORM_flag_present: 22784 fprintf_unfiltered (f, "flag: TRUE"); 22785 break; 22786 case DW_FORM_indirect: 22787 /* The reader will have reduced the indirect form to 22788 the "base form" so this form should not occur. */ 22789 fprintf_unfiltered (f, 22790 "unexpected attribute form: DW_FORM_indirect"); 22791 break; 22792 case DW_FORM_implicit_const: 22793 fprintf_unfiltered (f, "constant: %s", 22794 plongest (DW_SND (&die->attrs[i]))); 22795 break; 22796 default: 22797 fprintf_unfiltered (f, "unsupported attribute form: %d.", 22798 die->attrs[i].form); 22799 break; 22800 } 22801 fprintf_unfiltered (f, "\n"); 22802 } 22803 } 22804 22805 static void 22806 dump_die_for_error (struct die_info *die) 22807 { 22808 dump_die_shallow (gdb_stderr, 0, die); 22809 } 22810 22811 static void 22812 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die) 22813 { 22814 int indent = level * 4; 22815 22816 gdb_assert (die != NULL); 22817 22818 if (level >= max_level) 22819 return; 22820 22821 dump_die_shallow (f, indent, die); 22822 22823 if (die->child != NULL) 22824 { 22825 print_spaces (indent, f); 22826 fprintf_unfiltered (f, " Children:"); 22827 if (level + 1 < max_level) 22828 { 22829 fprintf_unfiltered (f, "\n"); 22830 dump_die_1 (f, level + 1, max_level, die->child); 22831 } 22832 else 22833 { 22834 fprintf_unfiltered (f, 22835 " [not printed, max nesting level reached]\n"); 22836 } 22837 } 22838 22839 if (die->sibling != NULL && level > 0) 22840 { 22841 dump_die_1 (f, level, max_level, die->sibling); 22842 } 22843 } 22844 22845 /* This is called from the pdie macro in gdbinit.in. 22846 It's not static so gcc will keep a copy callable from gdb. */ 22847 22848 void 22849 dump_die (struct die_info *die, int max_level) 22850 { 22851 dump_die_1 (gdb_stdlog, 0, max_level, die); 22852 } 22853 22854 static void 22855 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu) 22856 { 22857 void **slot; 22858 22859 slot = htab_find_slot_with_hash (cu->die_hash, die, 22860 to_underlying (die->sect_off), 22861 INSERT); 22862 22863 *slot = die; 22864 } 22865 22866 /* Follow reference or signature attribute ATTR of SRC_DIE. 22867 On entry *REF_CU is the CU of SRC_DIE. 22868 On exit *REF_CU is the CU of the result. */ 22869 22870 static struct die_info * 22871 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr, 22872 struct dwarf2_cu **ref_cu) 22873 { 22874 struct die_info *die; 22875 22876 if (attr->form_is_ref ()) 22877 die = follow_die_ref (src_die, attr, ref_cu); 22878 else if (attr->form == DW_FORM_ref_sig8) 22879 die = follow_die_sig (src_die, attr, ref_cu); 22880 else 22881 { 22882 dump_die_for_error (src_die); 22883 error (_("Dwarf Error: Expected reference attribute [in module %s]"), 22884 objfile_name ((*ref_cu)->per_objfile->objfile)); 22885 } 22886 22887 return die; 22888 } 22889 22890 /* Follow reference OFFSET. 22891 On entry *REF_CU is the CU of the source die referencing OFFSET. 22892 On exit *REF_CU is the CU of the result. 22893 Returns NULL if OFFSET is invalid. */ 22894 22895 static struct die_info * 22896 follow_die_offset (sect_offset sect_off, int offset_in_dwz, 22897 struct dwarf2_cu **ref_cu) 22898 { 22899 struct die_info temp_die; 22900 struct dwarf2_cu *target_cu, *cu = *ref_cu; 22901 dwarf2_per_objfile *per_objfile = cu->per_objfile; 22902 22903 gdb_assert (cu->per_cu != NULL); 22904 22905 target_cu = cu; 22906 22907 if (cu->per_cu->is_debug_types) 22908 { 22909 /* .debug_types CUs cannot reference anything outside their CU. 22910 If they need to, they have to reference a signatured type via 22911 DW_FORM_ref_sig8. */ 22912 if (!cu->header.offset_in_cu_p (sect_off)) 22913 return NULL; 22914 } 22915 else if (offset_in_dwz != cu->per_cu->is_dwz 22916 || !cu->header.offset_in_cu_p (sect_off)) 22917 { 22918 struct dwarf2_per_cu_data *per_cu; 22919 22920 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz, 22921 per_objfile); 22922 22923 /* If necessary, add it to the queue and load its DIEs. */ 22924 if (maybe_queue_comp_unit (cu, per_cu, per_objfile, cu->language)) 22925 load_full_comp_unit (per_cu, per_objfile, false, cu->language); 22926 22927 target_cu = per_objfile->get_cu (per_cu); 22928 } 22929 else if (cu->dies == NULL) 22930 { 22931 /* We're loading full DIEs during partial symbol reading. */ 22932 gdb_assert (per_objfile->per_bfd->reading_partial_symbols); 22933 load_full_comp_unit (cu->per_cu, per_objfile, false, language_minimal); 22934 } 22935 22936 *ref_cu = target_cu; 22937 temp_die.sect_off = sect_off; 22938 22939 if (target_cu != cu) 22940 target_cu->ancestor = cu; 22941 22942 return (struct die_info *) htab_find_with_hash (target_cu->die_hash, 22943 &temp_die, 22944 to_underlying (sect_off)); 22945 } 22946 22947 /* Follow reference attribute ATTR of SRC_DIE. 22948 On entry *REF_CU is the CU of SRC_DIE. 22949 On exit *REF_CU is the CU of the result. */ 22950 22951 static struct die_info * 22952 follow_die_ref (struct die_info *src_die, const struct attribute *attr, 22953 struct dwarf2_cu **ref_cu) 22954 { 22955 sect_offset sect_off = attr->get_ref_die_offset (); 22956 struct dwarf2_cu *cu = *ref_cu; 22957 struct die_info *die; 22958 22959 die = follow_die_offset (sect_off, 22960 (attr->form == DW_FORM_GNU_ref_alt 22961 || cu->per_cu->is_dwz), 22962 ref_cu); 22963 if (!die) 22964 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE " 22965 "at %s [in module %s]"), 22966 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off), 22967 objfile_name (cu->per_objfile->objfile)); 22968 22969 return die; 22970 } 22971 22972 /* See read.h. */ 22973 22974 struct dwarf2_locexpr_baton 22975 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off, 22976 dwarf2_per_cu_data *per_cu, 22977 dwarf2_per_objfile *per_objfile, 22978 gdb::function_view<CORE_ADDR ()> get_frame_pc, 22979 bool resolve_abstract_p) 22980 { 22981 struct die_info *die; 22982 struct attribute *attr; 22983 struct dwarf2_locexpr_baton retval; 22984 struct objfile *objfile = per_objfile->objfile; 22985 22986 dwarf2_cu *cu = per_objfile->get_cu (per_cu); 22987 if (cu == nullptr) 22988 cu = load_cu (per_cu, per_objfile, false); 22989 22990 if (cu == nullptr) 22991 { 22992 /* We shouldn't get here for a dummy CU, but don't crash on the user. 22993 Instead just throw an error, not much else we can do. */ 22994 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"), 22995 sect_offset_str (sect_off), objfile_name (objfile)); 22996 } 22997 22998 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu); 22999 if (!die) 23000 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"), 23001 sect_offset_str (sect_off), objfile_name (objfile)); 23002 23003 attr = dwarf2_attr (die, DW_AT_location, cu); 23004 if (!attr && resolve_abstract_p 23005 && (per_objfile->per_bfd->abstract_to_concrete.find (die->sect_off) 23006 != per_objfile->per_bfd->abstract_to_concrete.end ())) 23007 { 23008 CORE_ADDR pc = get_frame_pc (); 23009 CORE_ADDR baseaddr = objfile->text_section_offset (); 23010 struct gdbarch *gdbarch = objfile->arch (); 23011 23012 for (const auto &cand_off 23013 : per_objfile->per_bfd->abstract_to_concrete[die->sect_off]) 23014 { 23015 struct dwarf2_cu *cand_cu = cu; 23016 struct die_info *cand 23017 = follow_die_offset (cand_off, per_cu->is_dwz, &cand_cu); 23018 if (!cand 23019 || !cand->parent 23020 || cand->parent->tag != DW_TAG_subprogram) 23021 continue; 23022 23023 CORE_ADDR pc_low, pc_high; 23024 get_scope_pc_bounds (cand->parent, &pc_low, &pc_high, cu); 23025 if (pc_low == ((CORE_ADDR) -1)) 23026 continue; 23027 pc_low = gdbarch_adjust_dwarf2_addr (gdbarch, pc_low + baseaddr); 23028 pc_high = gdbarch_adjust_dwarf2_addr (gdbarch, pc_high + baseaddr); 23029 if (!(pc_low <= pc && pc < pc_high)) 23030 continue; 23031 23032 die = cand; 23033 attr = dwarf2_attr (die, DW_AT_location, cu); 23034 break; 23035 } 23036 } 23037 23038 if (!attr) 23039 { 23040 /* DWARF: "If there is no such attribute, then there is no effect.". 23041 DATA is ignored if SIZE is 0. */ 23042 23043 retval.data = NULL; 23044 retval.size = 0; 23045 } 23046 else if (attr->form_is_section_offset ()) 23047 { 23048 struct dwarf2_loclist_baton loclist_baton; 23049 CORE_ADDR pc = get_frame_pc (); 23050 size_t size; 23051 23052 fill_in_loclist_baton (cu, &loclist_baton, attr); 23053 23054 retval.data = dwarf2_find_location_expression (&loclist_baton, 23055 &size, pc); 23056 retval.size = size; 23057 } 23058 else 23059 { 23060 if (!attr->form_is_block ()) 23061 error (_("Dwarf Error: DIE at %s referenced in module %s " 23062 "is neither DW_FORM_block* nor DW_FORM_exprloc"), 23063 sect_offset_str (sect_off), objfile_name (objfile)); 23064 23065 retval.data = DW_BLOCK (attr)->data; 23066 retval.size = DW_BLOCK (attr)->size; 23067 } 23068 retval.per_objfile = per_objfile; 23069 retval.per_cu = cu->per_cu; 23070 23071 per_objfile->age_comp_units (); 23072 23073 return retval; 23074 } 23075 23076 /* See read.h. */ 23077 23078 struct dwarf2_locexpr_baton 23079 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu, 23080 dwarf2_per_cu_data *per_cu, 23081 dwarf2_per_objfile *per_objfile, 23082 gdb::function_view<CORE_ADDR ()> get_frame_pc) 23083 { 23084 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu); 23085 23086 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, per_objfile, 23087 get_frame_pc); 23088 } 23089 23090 /* Write a constant of a given type as target-ordered bytes into 23091 OBSTACK. */ 23092 23093 static const gdb_byte * 23094 write_constant_as_bytes (struct obstack *obstack, 23095 enum bfd_endian byte_order, 23096 struct type *type, 23097 ULONGEST value, 23098 LONGEST *len) 23099 { 23100 gdb_byte *result; 23101 23102 *len = TYPE_LENGTH (type); 23103 result = (gdb_byte *) obstack_alloc (obstack, *len); 23104 store_unsigned_integer (result, *len, byte_order, value); 23105 23106 return result; 23107 } 23108 23109 /* See read.h. */ 23110 23111 const gdb_byte * 23112 dwarf2_fetch_constant_bytes (sect_offset sect_off, 23113 dwarf2_per_cu_data *per_cu, 23114 dwarf2_per_objfile *per_objfile, 23115 obstack *obstack, 23116 LONGEST *len) 23117 { 23118 struct die_info *die; 23119 struct attribute *attr; 23120 const gdb_byte *result = NULL; 23121 struct type *type; 23122 LONGEST value; 23123 enum bfd_endian byte_order; 23124 struct objfile *objfile = per_objfile->objfile; 23125 23126 dwarf2_cu *cu = per_objfile->get_cu (per_cu); 23127 if (cu == nullptr) 23128 cu = load_cu (per_cu, per_objfile, false); 23129 23130 if (cu == nullptr) 23131 { 23132 /* We shouldn't get here for a dummy CU, but don't crash on the user. 23133 Instead just throw an error, not much else we can do. */ 23134 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"), 23135 sect_offset_str (sect_off), objfile_name (objfile)); 23136 } 23137 23138 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu); 23139 if (!die) 23140 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"), 23141 sect_offset_str (sect_off), objfile_name (objfile)); 23142 23143 attr = dwarf2_attr (die, DW_AT_const_value, cu); 23144 if (attr == NULL) 23145 return NULL; 23146 23147 byte_order = (bfd_big_endian (objfile->obfd) 23148 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE); 23149 23150 switch (attr->form) 23151 { 23152 case DW_FORM_addr: 23153 case DW_FORM_addrx: 23154 case DW_FORM_GNU_addr_index: 23155 { 23156 gdb_byte *tem; 23157 23158 *len = cu->header.addr_size; 23159 tem = (gdb_byte *) obstack_alloc (obstack, *len); 23160 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr)); 23161 result = tem; 23162 } 23163 break; 23164 case DW_FORM_string: 23165 case DW_FORM_strp: 23166 case DW_FORM_strx: 23167 case DW_FORM_GNU_str_index: 23168 case DW_FORM_GNU_strp_alt: 23169 /* DW_STRING is already allocated on the objfile obstack, point 23170 directly to it. */ 23171 result = (const gdb_byte *) DW_STRING (attr); 23172 *len = strlen (DW_STRING (attr)); 23173 break; 23174 case DW_FORM_block1: 23175 case DW_FORM_block2: 23176 case DW_FORM_block4: 23177 case DW_FORM_block: 23178 case DW_FORM_exprloc: 23179 case DW_FORM_data16: 23180 result = DW_BLOCK (attr)->data; 23181 *len = DW_BLOCK (attr)->size; 23182 break; 23183 23184 /* The DW_AT_const_value attributes are supposed to carry the 23185 symbol's value "represented as it would be on the target 23186 architecture." By the time we get here, it's already been 23187 converted to host endianness, so we just need to sign- or 23188 zero-extend it as appropriate. */ 23189 case DW_FORM_data1: 23190 type = die_type (die, cu); 23191 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8); 23192 if (result == NULL) 23193 result = write_constant_as_bytes (obstack, byte_order, 23194 type, value, len); 23195 break; 23196 case DW_FORM_data2: 23197 type = die_type (die, cu); 23198 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16); 23199 if (result == NULL) 23200 result = write_constant_as_bytes (obstack, byte_order, 23201 type, value, len); 23202 break; 23203 case DW_FORM_data4: 23204 type = die_type (die, cu); 23205 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32); 23206 if (result == NULL) 23207 result = write_constant_as_bytes (obstack, byte_order, 23208 type, value, len); 23209 break; 23210 case DW_FORM_data8: 23211 type = die_type (die, cu); 23212 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64); 23213 if (result == NULL) 23214 result = write_constant_as_bytes (obstack, byte_order, 23215 type, value, len); 23216 break; 23217 23218 case DW_FORM_sdata: 23219 case DW_FORM_implicit_const: 23220 type = die_type (die, cu); 23221 result = write_constant_as_bytes (obstack, byte_order, 23222 type, DW_SND (attr), len); 23223 break; 23224 23225 case DW_FORM_udata: 23226 type = die_type (die, cu); 23227 result = write_constant_as_bytes (obstack, byte_order, 23228 type, DW_UNSND (attr), len); 23229 break; 23230 23231 default: 23232 complaint (_("unsupported const value attribute form: '%s'"), 23233 dwarf_form_name (attr->form)); 23234 break; 23235 } 23236 23237 return result; 23238 } 23239 23240 /* See read.h. */ 23241 23242 struct type * 23243 dwarf2_fetch_die_type_sect_off (sect_offset sect_off, 23244 dwarf2_per_cu_data *per_cu, 23245 dwarf2_per_objfile *per_objfile) 23246 { 23247 struct die_info *die; 23248 23249 dwarf2_cu *cu = per_objfile->get_cu (per_cu); 23250 if (cu == nullptr) 23251 cu = load_cu (per_cu, per_objfile, false); 23252 23253 if (cu == nullptr) 23254 return nullptr; 23255 23256 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu); 23257 if (!die) 23258 return NULL; 23259 23260 return die_type (die, cu); 23261 } 23262 23263 /* See read.h. */ 23264 23265 struct type * 23266 dwarf2_get_die_type (cu_offset die_offset, 23267 dwarf2_per_cu_data *per_cu, 23268 dwarf2_per_objfile *per_objfile) 23269 { 23270 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset); 23271 return get_die_type_at_offset (die_offset_sect, per_cu, per_objfile); 23272 } 23273 23274 /* Follow type unit SIG_TYPE referenced by SRC_DIE. 23275 On entry *REF_CU is the CU of SRC_DIE. 23276 On exit *REF_CU is the CU of the result. 23277 Returns NULL if the referenced DIE isn't found. */ 23278 23279 static struct die_info * 23280 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type, 23281 struct dwarf2_cu **ref_cu) 23282 { 23283 struct die_info temp_die; 23284 struct dwarf2_cu *sig_cu, *cu = *ref_cu; 23285 struct die_info *die; 23286 dwarf2_per_objfile *per_objfile = (*ref_cu)->per_objfile; 23287 23288 23289 /* While it might be nice to assert sig_type->type == NULL here, 23290 we can get here for DW_AT_imported_declaration where we need 23291 the DIE not the type. */ 23292 23293 /* If necessary, add it to the queue and load its DIEs. */ 23294 23295 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, per_objfile, 23296 language_minimal)) 23297 read_signatured_type (sig_type, per_objfile); 23298 23299 sig_cu = per_objfile->get_cu (&sig_type->per_cu); 23300 gdb_assert (sig_cu != NULL); 23301 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0); 23302 temp_die.sect_off = sig_type->type_offset_in_section; 23303 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die, 23304 to_underlying (temp_die.sect_off)); 23305 if (die) 23306 { 23307 /* For .gdb_index version 7 keep track of included TUs. 23308 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */ 23309 if (per_objfile->per_bfd->index_table != NULL 23310 && per_objfile->per_bfd->index_table->version <= 7) 23311 { 23312 (*ref_cu)->per_cu->imported_symtabs_push (sig_cu->per_cu); 23313 } 23314 23315 *ref_cu = sig_cu; 23316 if (sig_cu != cu) 23317 sig_cu->ancestor = cu; 23318 23319 return die; 23320 } 23321 23322 return NULL; 23323 } 23324 23325 /* Follow signatured type referenced by ATTR in SRC_DIE. 23326 On entry *REF_CU is the CU of SRC_DIE. 23327 On exit *REF_CU is the CU of the result. 23328 The result is the DIE of the type. 23329 If the referenced type cannot be found an error is thrown. */ 23330 23331 static struct die_info * 23332 follow_die_sig (struct die_info *src_die, const struct attribute *attr, 23333 struct dwarf2_cu **ref_cu) 23334 { 23335 ULONGEST signature = DW_SIGNATURE (attr); 23336 struct signatured_type *sig_type; 23337 struct die_info *die; 23338 23339 gdb_assert (attr->form == DW_FORM_ref_sig8); 23340 23341 sig_type = lookup_signatured_type (*ref_cu, signature); 23342 /* sig_type will be NULL if the signatured type is missing from 23343 the debug info. */ 23344 if (sig_type == NULL) 23345 { 23346 error (_("Dwarf Error: Cannot find signatured DIE %s referenced" 23347 " from DIE at %s [in module %s]"), 23348 hex_string (signature), sect_offset_str (src_die->sect_off), 23349 objfile_name ((*ref_cu)->per_objfile->objfile)); 23350 } 23351 23352 die = follow_die_sig_1 (src_die, sig_type, ref_cu); 23353 if (die == NULL) 23354 { 23355 dump_die_for_error (src_die); 23356 error (_("Dwarf Error: Problem reading signatured DIE %s referenced" 23357 " from DIE at %s [in module %s]"), 23358 hex_string (signature), sect_offset_str (src_die->sect_off), 23359 objfile_name ((*ref_cu)->per_objfile->objfile)); 23360 } 23361 23362 return die; 23363 } 23364 23365 /* Get the type specified by SIGNATURE referenced in DIE/CU, 23366 reading in and processing the type unit if necessary. */ 23367 23368 static struct type * 23369 get_signatured_type (struct die_info *die, ULONGEST signature, 23370 struct dwarf2_cu *cu) 23371 { 23372 dwarf2_per_objfile *per_objfile = cu->per_objfile; 23373 struct signatured_type *sig_type; 23374 struct dwarf2_cu *type_cu; 23375 struct die_info *type_die; 23376 struct type *type; 23377 23378 sig_type = lookup_signatured_type (cu, signature); 23379 /* sig_type will be NULL if the signatured type is missing from 23380 the debug info. */ 23381 if (sig_type == NULL) 23382 { 23383 complaint (_("Dwarf Error: Cannot find signatured DIE %s referenced" 23384 " from DIE at %s [in module %s]"), 23385 hex_string (signature), sect_offset_str (die->sect_off), 23386 objfile_name (per_objfile->objfile)); 23387 return build_error_marker_type (cu, die); 23388 } 23389 23390 /* If we already know the type we're done. */ 23391 type = per_objfile->get_type_for_signatured_type (sig_type); 23392 if (type != nullptr) 23393 return type; 23394 23395 type_cu = cu; 23396 type_die = follow_die_sig_1 (die, sig_type, &type_cu); 23397 if (type_die != NULL) 23398 { 23399 /* N.B. We need to call get_die_type to ensure only one type for this DIE 23400 is created. This is important, for example, because for c++ classes 23401 we need TYPE_NAME set which is only done by new_symbol. Blech. */ 23402 type = read_type_die (type_die, type_cu); 23403 if (type == NULL) 23404 { 23405 complaint (_("Dwarf Error: Cannot build signatured type %s" 23406 " referenced from DIE at %s [in module %s]"), 23407 hex_string (signature), sect_offset_str (die->sect_off), 23408 objfile_name (per_objfile->objfile)); 23409 type = build_error_marker_type (cu, die); 23410 } 23411 } 23412 else 23413 { 23414 complaint (_("Dwarf Error: Problem reading signatured DIE %s referenced" 23415 " from DIE at %s [in module %s]"), 23416 hex_string (signature), sect_offset_str (die->sect_off), 23417 objfile_name (per_objfile->objfile)); 23418 type = build_error_marker_type (cu, die); 23419 } 23420 23421 per_objfile->set_type_for_signatured_type (sig_type, type); 23422 23423 return type; 23424 } 23425 23426 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU, 23427 reading in and processing the type unit if necessary. */ 23428 23429 static struct type * 23430 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr, 23431 struct dwarf2_cu *cu) /* ARI: editCase function */ 23432 { 23433 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */ 23434 if (attr->form_is_ref ()) 23435 { 23436 struct dwarf2_cu *type_cu = cu; 23437 struct die_info *type_die = follow_die_ref (die, attr, &type_cu); 23438 23439 return read_type_die (type_die, type_cu); 23440 } 23441 else if (attr->form == DW_FORM_ref_sig8) 23442 { 23443 return get_signatured_type (die, DW_SIGNATURE (attr), cu); 23444 } 23445 else 23446 { 23447 dwarf2_per_objfile *per_objfile = cu->per_objfile; 23448 23449 complaint (_("Dwarf Error: DW_AT_signature has bad form %s in DIE" 23450 " at %s [in module %s]"), 23451 dwarf_form_name (attr->form), sect_offset_str (die->sect_off), 23452 objfile_name (per_objfile->objfile)); 23453 return build_error_marker_type (cu, die); 23454 } 23455 } 23456 23457 /* Load the DIEs associated with type unit PER_CU into memory. */ 23458 23459 static void 23460 load_full_type_unit (dwarf2_per_cu_data *per_cu, 23461 dwarf2_per_objfile *per_objfile) 23462 { 23463 struct signatured_type *sig_type; 23464 23465 /* Caller is responsible for ensuring type_unit_groups don't get here. */ 23466 gdb_assert (! per_cu->type_unit_group_p ()); 23467 23468 /* We have the per_cu, but we need the signatured_type. 23469 Fortunately this is an easy translation. */ 23470 gdb_assert (per_cu->is_debug_types); 23471 sig_type = (struct signatured_type *) per_cu; 23472 23473 gdb_assert (per_objfile->get_cu (per_cu) == nullptr); 23474 23475 read_signatured_type (sig_type, per_objfile); 23476 23477 gdb_assert (per_objfile->get_cu (per_cu) != nullptr); 23478 } 23479 23480 /* Read in a signatured type and build its CU and DIEs. 23481 If the type is a stub for the real type in a DWO file, 23482 read in the real type from the DWO file as well. */ 23483 23484 static void 23485 read_signatured_type (signatured_type *sig_type, 23486 dwarf2_per_objfile *per_objfile) 23487 { 23488 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu; 23489 23490 gdb_assert (per_cu->is_debug_types); 23491 gdb_assert (per_objfile->get_cu (per_cu) == nullptr); 23492 23493 cutu_reader reader (per_cu, per_objfile, nullptr, nullptr, false); 23494 23495 if (!reader.dummy_p) 23496 { 23497 struct dwarf2_cu *cu = reader.cu; 23498 const gdb_byte *info_ptr = reader.info_ptr; 23499 23500 gdb_assert (cu->die_hash == NULL); 23501 cu->die_hash = 23502 htab_create_alloc_ex (cu->header.length / 12, 23503 die_hash, 23504 die_eq, 23505 NULL, 23506 &cu->comp_unit_obstack, 23507 hashtab_obstack_allocate, 23508 dummy_obstack_deallocate); 23509 23510 if (reader.comp_unit_die->has_children) 23511 reader.comp_unit_die->child 23512 = read_die_and_siblings (&reader, info_ptr, &info_ptr, 23513 reader.comp_unit_die); 23514 cu->dies = reader.comp_unit_die; 23515 /* comp_unit_die is not stored in die_hash, no need. */ 23516 23517 /* We try not to read any attributes in this function, because 23518 not all CUs needed for references have been loaded yet, and 23519 symbol table processing isn't initialized. But we have to 23520 set the CU language, or we won't be able to build types 23521 correctly. Similarly, if we do not read the producer, we can 23522 not apply producer-specific interpretation. */ 23523 prepare_one_comp_unit (cu, cu->dies, language_minimal); 23524 23525 reader.keep (); 23526 } 23527 23528 sig_type->per_cu.tu_read = 1; 23529 } 23530 23531 /* Decode simple location descriptions. 23532 Given a pointer to a dwarf block that defines a location, compute 23533 the location and return the value. If COMPUTED is non-null, it is 23534 set to true to indicate that decoding was successful, and false 23535 otherwise. If COMPUTED is null, then this function may emit a 23536 complaint. */ 23537 23538 static CORE_ADDR 23539 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu, bool *computed) 23540 { 23541 struct objfile *objfile = cu->per_objfile->objfile; 23542 size_t i; 23543 size_t size = blk->size; 23544 const gdb_byte *data = blk->data; 23545 CORE_ADDR stack[64]; 23546 int stacki; 23547 unsigned int bytes_read, unsnd; 23548 gdb_byte op; 23549 23550 if (computed != nullptr) 23551 *computed = false; 23552 23553 i = 0; 23554 stacki = 0; 23555 stack[stacki] = 0; 23556 stack[++stacki] = 0; 23557 23558 while (i < size) 23559 { 23560 op = data[i++]; 23561 switch (op) 23562 { 23563 case DW_OP_lit0: 23564 case DW_OP_lit1: 23565 case DW_OP_lit2: 23566 case DW_OP_lit3: 23567 case DW_OP_lit4: 23568 case DW_OP_lit5: 23569 case DW_OP_lit6: 23570 case DW_OP_lit7: 23571 case DW_OP_lit8: 23572 case DW_OP_lit9: 23573 case DW_OP_lit10: 23574 case DW_OP_lit11: 23575 case DW_OP_lit12: 23576 case DW_OP_lit13: 23577 case DW_OP_lit14: 23578 case DW_OP_lit15: 23579 case DW_OP_lit16: 23580 case DW_OP_lit17: 23581 case DW_OP_lit18: 23582 case DW_OP_lit19: 23583 case DW_OP_lit20: 23584 case DW_OP_lit21: 23585 case DW_OP_lit22: 23586 case DW_OP_lit23: 23587 case DW_OP_lit24: 23588 case DW_OP_lit25: 23589 case DW_OP_lit26: 23590 case DW_OP_lit27: 23591 case DW_OP_lit28: 23592 case DW_OP_lit29: 23593 case DW_OP_lit30: 23594 case DW_OP_lit31: 23595 stack[++stacki] = op - DW_OP_lit0; 23596 break; 23597 23598 case DW_OP_reg0: 23599 case DW_OP_reg1: 23600 case DW_OP_reg2: 23601 case DW_OP_reg3: 23602 case DW_OP_reg4: 23603 case DW_OP_reg5: 23604 case DW_OP_reg6: 23605 case DW_OP_reg7: 23606 case DW_OP_reg8: 23607 case DW_OP_reg9: 23608 case DW_OP_reg10: 23609 case DW_OP_reg11: 23610 case DW_OP_reg12: 23611 case DW_OP_reg13: 23612 case DW_OP_reg14: 23613 case DW_OP_reg15: 23614 case DW_OP_reg16: 23615 case DW_OP_reg17: 23616 case DW_OP_reg18: 23617 case DW_OP_reg19: 23618 case DW_OP_reg20: 23619 case DW_OP_reg21: 23620 case DW_OP_reg22: 23621 case DW_OP_reg23: 23622 case DW_OP_reg24: 23623 case DW_OP_reg25: 23624 case DW_OP_reg26: 23625 case DW_OP_reg27: 23626 case DW_OP_reg28: 23627 case DW_OP_reg29: 23628 case DW_OP_reg30: 23629 case DW_OP_reg31: 23630 stack[++stacki] = op - DW_OP_reg0; 23631 if (i < size) 23632 { 23633 if (computed == nullptr) 23634 dwarf2_complex_location_expr_complaint (); 23635 else 23636 return 0; 23637 } 23638 break; 23639 23640 case DW_OP_regx: 23641 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read); 23642 i += bytes_read; 23643 stack[++stacki] = unsnd; 23644 if (i < size) 23645 { 23646 if (computed == nullptr) 23647 dwarf2_complex_location_expr_complaint (); 23648 else 23649 return 0; 23650 } 23651 break; 23652 23653 case DW_OP_addr: 23654 stack[++stacki] = cu->header.read_address (objfile->obfd, &data[i], 23655 &bytes_read); 23656 i += bytes_read; 23657 break; 23658 23659 case DW_OP_const1u: 23660 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]); 23661 i += 1; 23662 break; 23663 23664 case DW_OP_const1s: 23665 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]); 23666 i += 1; 23667 break; 23668 23669 case DW_OP_const2u: 23670 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]); 23671 i += 2; 23672 break; 23673 23674 case DW_OP_const2s: 23675 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]); 23676 i += 2; 23677 break; 23678 23679 case DW_OP_const4u: 23680 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]); 23681 i += 4; 23682 break; 23683 23684 case DW_OP_const4s: 23685 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]); 23686 i += 4; 23687 break; 23688 23689 case DW_OP_const8u: 23690 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]); 23691 i += 8; 23692 break; 23693 23694 case DW_OP_constu: 23695 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i), 23696 &bytes_read); 23697 i += bytes_read; 23698 break; 23699 23700 case DW_OP_consts: 23701 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read); 23702 i += bytes_read; 23703 break; 23704 23705 case DW_OP_dup: 23706 stack[stacki + 1] = stack[stacki]; 23707 stacki++; 23708 break; 23709 23710 case DW_OP_plus: 23711 stack[stacki - 1] += stack[stacki]; 23712 stacki--; 23713 break; 23714 23715 case DW_OP_plus_uconst: 23716 stack[stacki] += read_unsigned_leb128 (NULL, (data + i), 23717 &bytes_read); 23718 i += bytes_read; 23719 break; 23720 23721 case DW_OP_minus: 23722 stack[stacki - 1] -= stack[stacki]; 23723 stacki--; 23724 break; 23725 23726 case DW_OP_deref: 23727 /* If we're not the last op, then we definitely can't encode 23728 this using GDB's address_class enum. This is valid for partial 23729 global symbols, although the variable's address will be bogus 23730 in the psymtab. */ 23731 if (i < size) 23732 { 23733 if (computed == nullptr) 23734 dwarf2_complex_location_expr_complaint (); 23735 else 23736 return 0; 23737 } 23738 break; 23739 23740 case DW_OP_GNU_push_tls_address: 23741 case DW_OP_form_tls_address: 23742 /* The top of the stack has the offset from the beginning 23743 of the thread control block at which the variable is located. */ 23744 /* Nothing should follow this operator, so the top of stack would 23745 be returned. */ 23746 /* This is valid for partial global symbols, but the variable's 23747 address will be bogus in the psymtab. Make it always at least 23748 non-zero to not look as a variable garbage collected by linker 23749 which have DW_OP_addr 0. */ 23750 if (i < size) 23751 { 23752 if (computed == nullptr) 23753 dwarf2_complex_location_expr_complaint (); 23754 else 23755 return 0; 23756 } 23757 stack[stacki]++; 23758 break; 23759 23760 case DW_OP_GNU_uninit: 23761 if (computed != nullptr) 23762 return 0; 23763 break; 23764 23765 case DW_OP_addrx: 23766 case DW_OP_GNU_addr_index: 23767 case DW_OP_GNU_const_index: 23768 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i], 23769 &bytes_read); 23770 i += bytes_read; 23771 break; 23772 23773 default: 23774 if (computed == nullptr) 23775 { 23776 const char *name = get_DW_OP_name (op); 23777 23778 if (name) 23779 complaint (_("unsupported stack op: '%s'"), 23780 name); 23781 else 23782 complaint (_("unsupported stack op: '%02x'"), 23783 op); 23784 } 23785 23786 return (stack[stacki]); 23787 } 23788 23789 /* Enforce maximum stack depth of SIZE-1 to avoid writing 23790 outside of the allocated space. Also enforce minimum>0. */ 23791 if (stacki >= ARRAY_SIZE (stack) - 1) 23792 { 23793 if (computed == nullptr) 23794 complaint (_("location description stack overflow")); 23795 return 0; 23796 } 23797 23798 if (stacki <= 0) 23799 { 23800 if (computed == nullptr) 23801 complaint (_("location description stack underflow")); 23802 return 0; 23803 } 23804 } 23805 23806 if (computed != nullptr) 23807 *computed = true; 23808 return (stack[stacki]); 23809 } 23810 23811 /* memory allocation interface */ 23812 23813 static struct dwarf_block * 23814 dwarf_alloc_block (struct dwarf2_cu *cu) 23815 { 23816 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block); 23817 } 23818 23819 static struct die_info * 23820 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs) 23821 { 23822 struct die_info *die; 23823 size_t size = sizeof (struct die_info); 23824 23825 if (num_attrs > 1) 23826 size += (num_attrs - 1) * sizeof (struct attribute); 23827 23828 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size); 23829 memset (die, 0, sizeof (struct die_info)); 23830 return (die); 23831 } 23832 23833 23834 23835 /* Macro support. */ 23836 23837 /* An overload of dwarf_decode_macros that finds the correct section 23838 and ensures it is read in before calling the other overload. */ 23839 23840 static void 23841 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset, 23842 int section_is_gnu) 23843 { 23844 dwarf2_per_objfile *per_objfile = cu->per_objfile; 23845 struct objfile *objfile = per_objfile->objfile; 23846 const struct line_header *lh = cu->line_header; 23847 unsigned int offset_size = cu->header.offset_size; 23848 struct dwarf2_section_info *section; 23849 const char *section_name; 23850 23851 if (cu->dwo_unit != nullptr) 23852 { 23853 if (section_is_gnu) 23854 { 23855 section = &cu->dwo_unit->dwo_file->sections.macro; 23856 section_name = ".debug_macro.dwo"; 23857 } 23858 else 23859 { 23860 section = &cu->dwo_unit->dwo_file->sections.macinfo; 23861 section_name = ".debug_macinfo.dwo"; 23862 } 23863 } 23864 else 23865 { 23866 if (section_is_gnu) 23867 { 23868 section = &per_objfile->per_bfd->macro; 23869 section_name = ".debug_macro"; 23870 } 23871 else 23872 { 23873 section = &per_objfile->per_bfd->macinfo; 23874 section_name = ".debug_macinfo"; 23875 } 23876 } 23877 23878 section->read (objfile); 23879 if (section->buffer == nullptr) 23880 { 23881 complaint (_("missing %s section"), section_name); 23882 return; 23883 } 23884 23885 buildsym_compunit *builder = cu->get_builder (); 23886 23887 dwarf_decode_macros (per_objfile, builder, section, lh, 23888 offset_size, offset, section_is_gnu); 23889 } 23890 23891 /* Return the .debug_loc section to use for CU. 23892 For DWO files use .debug_loc.dwo. */ 23893 23894 static struct dwarf2_section_info * 23895 cu_debug_loc_section (struct dwarf2_cu *cu) 23896 { 23897 dwarf2_per_objfile *per_objfile = cu->per_objfile; 23898 23899 if (cu->dwo_unit) 23900 { 23901 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections; 23902 23903 return cu->header.version >= 5 ? §ions->loclists : §ions->loc; 23904 } 23905 return (cu->header.version >= 5 ? &per_objfile->per_bfd->loclists 23906 : &per_objfile->per_bfd->loc); 23907 } 23908 23909 /* Return the .debug_rnglists section to use for CU. */ 23910 static struct dwarf2_section_info * 23911 cu_debug_rnglists_section (struct dwarf2_cu *cu, dwarf_tag tag) 23912 { 23913 if (cu->header.version < 5) 23914 error (_(".debug_rnglists section cannot be used in DWARF %d"), 23915 cu->header.version); 23916 struct dwarf2_per_objfile *dwarf2_per_objfile = cu->per_objfile; 23917 23918 /* Make sure we read the .debug_rnglists section from the file that 23919 contains the DW_AT_ranges attribute we are reading. Normally that 23920 would be the .dwo file, if there is one. However for DW_TAG_compile_unit 23921 or DW_TAG_skeleton unit, we always want to read from objfile/linked 23922 program. */ 23923 if (cu->dwo_unit != nullptr 23924 && tag != DW_TAG_compile_unit 23925 && tag != DW_TAG_skeleton_unit) 23926 { 23927 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections; 23928 23929 if (sections->rnglists.size > 0) 23930 return §ions->rnglists; 23931 else 23932 error (_(".debug_rnglists section is missing from .dwo file.")); 23933 } 23934 return &dwarf2_per_objfile->per_bfd->rnglists; 23935 } 23936 23937 /* A helper function that fills in a dwarf2_loclist_baton. */ 23938 23939 static void 23940 fill_in_loclist_baton (struct dwarf2_cu *cu, 23941 struct dwarf2_loclist_baton *baton, 23942 const struct attribute *attr) 23943 { 23944 dwarf2_per_objfile *per_objfile = cu->per_objfile; 23945 struct dwarf2_section_info *section = cu_debug_loc_section (cu); 23946 23947 section->read (per_objfile->objfile); 23948 23949 baton->per_objfile = per_objfile; 23950 baton->per_cu = cu->per_cu; 23951 gdb_assert (baton->per_cu); 23952 /* We don't know how long the location list is, but make sure we 23953 don't run off the edge of the section. */ 23954 baton->size = section->size - DW_UNSND (attr); 23955 baton->data = section->buffer + DW_UNSND (attr); 23956 if (cu->base_address.has_value ()) 23957 baton->base_address = *cu->base_address; 23958 else 23959 baton->base_address = 0; 23960 baton->from_dwo = cu->dwo_unit != NULL; 23961 } 23962 23963 static void 23964 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym, 23965 struct dwarf2_cu *cu, int is_block) 23966 { 23967 dwarf2_per_objfile *per_objfile = cu->per_objfile; 23968 struct objfile *objfile = per_objfile->objfile; 23969 struct dwarf2_section_info *section = cu_debug_loc_section (cu); 23970 23971 if (attr->form_is_section_offset () 23972 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside 23973 the section. If so, fall through to the complaint in the 23974 other branch. */ 23975 && DW_UNSND (attr) < section->get_size (objfile)) 23976 { 23977 struct dwarf2_loclist_baton *baton; 23978 23979 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton); 23980 23981 fill_in_loclist_baton (cu, baton, attr); 23982 23983 if (!cu->base_address.has_value ()) 23984 complaint (_("Location list used without " 23985 "specifying the CU base address.")); 23986 23987 SYMBOL_ACLASS_INDEX (sym) = (is_block 23988 ? dwarf2_loclist_block_index 23989 : dwarf2_loclist_index); 23990 SYMBOL_LOCATION_BATON (sym) = baton; 23991 } 23992 else 23993 { 23994 struct dwarf2_locexpr_baton *baton; 23995 23996 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton); 23997 baton->per_objfile = per_objfile; 23998 baton->per_cu = cu->per_cu; 23999 gdb_assert (baton->per_cu); 24000 24001 if (attr->form_is_block ()) 24002 { 24003 /* Note that we're just copying the block's data pointer 24004 here, not the actual data. We're still pointing into the 24005 info_buffer for SYM's objfile; right now we never release 24006 that buffer, but when we do clean up properly this may 24007 need to change. */ 24008 baton->size = DW_BLOCK (attr)->size; 24009 baton->data = DW_BLOCK (attr)->data; 24010 } 24011 else 24012 { 24013 dwarf2_invalid_attrib_class_complaint ("location description", 24014 sym->natural_name ()); 24015 baton->size = 0; 24016 } 24017 24018 SYMBOL_ACLASS_INDEX (sym) = (is_block 24019 ? dwarf2_locexpr_block_index 24020 : dwarf2_locexpr_index); 24021 SYMBOL_LOCATION_BATON (sym) = baton; 24022 } 24023 } 24024 24025 /* See read.h. */ 24026 24027 const comp_unit_head * 24028 dwarf2_per_cu_data::get_header () const 24029 { 24030 if (!m_header_read_in) 24031 { 24032 const gdb_byte *info_ptr 24033 = this->section->buffer + to_underlying (this->sect_off); 24034 24035 memset (&m_header, 0, sizeof (m_header)); 24036 24037 read_comp_unit_head (&m_header, info_ptr, this->section, 24038 rcuh_kind::COMPILE); 24039 } 24040 24041 return &m_header; 24042 } 24043 24044 /* See read.h. */ 24045 24046 int 24047 dwarf2_per_cu_data::addr_size () const 24048 { 24049 return this->get_header ()->addr_size; 24050 } 24051 24052 /* See read.h. */ 24053 24054 int 24055 dwarf2_per_cu_data::offset_size () const 24056 { 24057 return this->get_header ()->offset_size; 24058 } 24059 24060 /* See read.h. */ 24061 24062 int 24063 dwarf2_per_cu_data::ref_addr_size () const 24064 { 24065 const comp_unit_head *header = this->get_header (); 24066 24067 if (header->version == 2) 24068 return header->addr_size; 24069 else 24070 return header->offset_size; 24071 } 24072 24073 /* See read.h. */ 24074 24075 struct type * 24076 dwarf2_cu::addr_type () const 24077 { 24078 struct objfile *objfile = this->per_objfile->objfile; 24079 struct type *void_type = objfile_type (objfile)->builtin_void; 24080 struct type *addr_type = lookup_pointer_type (void_type); 24081 int addr_size = this->per_cu->addr_size (); 24082 24083 if (TYPE_LENGTH (addr_type) == addr_size) 24084 return addr_type; 24085 24086 addr_type = addr_sized_int_type (TYPE_UNSIGNED (addr_type)); 24087 return addr_type; 24088 } 24089 24090 /* A helper function for dwarf2_find_containing_comp_unit that returns 24091 the index of the result, and that searches a vector. It will 24092 return a result even if the offset in question does not actually 24093 occur in any CU. This is separate so that it can be unit 24094 tested. */ 24095 24096 static int 24097 dwarf2_find_containing_comp_unit 24098 (sect_offset sect_off, 24099 unsigned int offset_in_dwz, 24100 const std::vector<dwarf2_per_cu_data *> &all_comp_units) 24101 { 24102 int low, high; 24103 24104 low = 0; 24105 high = all_comp_units.size () - 1; 24106 while (high > low) 24107 { 24108 struct dwarf2_per_cu_data *mid_cu; 24109 int mid = low + (high - low) / 2; 24110 24111 mid_cu = all_comp_units[mid]; 24112 if (mid_cu->is_dwz > offset_in_dwz 24113 || (mid_cu->is_dwz == offset_in_dwz 24114 && mid_cu->sect_off + mid_cu->length > sect_off)) 24115 high = mid; 24116 else 24117 low = mid + 1; 24118 } 24119 gdb_assert (low == high); 24120 return low; 24121 } 24122 24123 /* Locate the .debug_info compilation unit from CU's objfile which contains 24124 the DIE at OFFSET. Raises an error on failure. */ 24125 24126 static struct dwarf2_per_cu_data * 24127 dwarf2_find_containing_comp_unit (sect_offset sect_off, 24128 unsigned int offset_in_dwz, 24129 dwarf2_per_objfile *per_objfile) 24130 { 24131 int low = dwarf2_find_containing_comp_unit 24132 (sect_off, offset_in_dwz, per_objfile->per_bfd->all_comp_units); 24133 dwarf2_per_cu_data *this_cu = per_objfile->per_bfd->all_comp_units[low]; 24134 24135 if (this_cu->is_dwz != offset_in_dwz || this_cu->sect_off > sect_off) 24136 { 24137 if (low == 0 || this_cu->is_dwz != offset_in_dwz) 24138 error (_("Dwarf Error: could not find partial DIE containing " 24139 "offset %s [in module %s]"), 24140 sect_offset_str (sect_off), 24141 bfd_get_filename (per_objfile->objfile->obfd)); 24142 24143 gdb_assert (per_objfile->per_bfd->all_comp_units[low-1]->sect_off 24144 <= sect_off); 24145 return per_objfile->per_bfd->all_comp_units[low-1]; 24146 } 24147 else 24148 { 24149 if (low == per_objfile->per_bfd->all_comp_units.size () - 1 24150 && sect_off >= this_cu->sect_off + this_cu->length) 24151 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off)); 24152 gdb_assert (sect_off < this_cu->sect_off + this_cu->length); 24153 return this_cu; 24154 } 24155 } 24156 24157 #if GDB_SELF_TEST 24158 24159 namespace selftests { 24160 namespace find_containing_comp_unit { 24161 24162 static void 24163 run_test () 24164 { 24165 struct dwarf2_per_cu_data one {}; 24166 struct dwarf2_per_cu_data two {}; 24167 struct dwarf2_per_cu_data three {}; 24168 struct dwarf2_per_cu_data four {}; 24169 24170 one.length = 5; 24171 two.sect_off = sect_offset (one.length); 24172 two.length = 7; 24173 24174 three.length = 5; 24175 three.is_dwz = 1; 24176 four.sect_off = sect_offset (three.length); 24177 four.length = 7; 24178 four.is_dwz = 1; 24179 24180 std::vector<dwarf2_per_cu_data *> units; 24181 units.push_back (&one); 24182 units.push_back (&two); 24183 units.push_back (&three); 24184 units.push_back (&four); 24185 24186 int result; 24187 24188 result = dwarf2_find_containing_comp_unit (sect_offset (0), 0, units); 24189 SELF_CHECK (units[result] == &one); 24190 result = dwarf2_find_containing_comp_unit (sect_offset (3), 0, units); 24191 SELF_CHECK (units[result] == &one); 24192 result = dwarf2_find_containing_comp_unit (sect_offset (5), 0, units); 24193 SELF_CHECK (units[result] == &two); 24194 24195 result = dwarf2_find_containing_comp_unit (sect_offset (0), 1, units); 24196 SELF_CHECK (units[result] == &three); 24197 result = dwarf2_find_containing_comp_unit (sect_offset (3), 1, units); 24198 SELF_CHECK (units[result] == &three); 24199 result = dwarf2_find_containing_comp_unit (sect_offset (5), 1, units); 24200 SELF_CHECK (units[result] == &four); 24201 } 24202 24203 } 24204 } 24205 24206 #endif /* GDB_SELF_TEST */ 24207 24208 /* Initialize dwarf2_cu to read PER_CU, in the context of PER_OBJFILE. */ 24209 24210 dwarf2_cu::dwarf2_cu (dwarf2_per_cu_data *per_cu, 24211 dwarf2_per_objfile *per_objfile) 24212 : per_cu (per_cu), 24213 per_objfile (per_objfile), 24214 mark (false), 24215 has_loclist (false), 24216 checked_producer (false), 24217 producer_is_gxx_lt_4_6 (false), 24218 producer_is_gcc_lt_4_3 (false), 24219 producer_is_icc (false), 24220 producer_is_icc_lt_14 (false), 24221 producer_is_codewarrior (false), 24222 processing_has_namespace_info (false) 24223 { 24224 } 24225 24226 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */ 24227 24228 static void 24229 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die, 24230 enum language pretend_language) 24231 { 24232 struct attribute *attr; 24233 24234 /* Set the language we're debugging. */ 24235 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu); 24236 if (attr != nullptr) 24237 set_cu_language (DW_UNSND (attr), cu); 24238 else 24239 { 24240 cu->language = pretend_language; 24241 cu->language_defn = language_def (cu->language); 24242 } 24243 24244 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu); 24245 } 24246 24247 /* See read.h. */ 24248 24249 dwarf2_cu * 24250 dwarf2_per_objfile::get_cu (dwarf2_per_cu_data *per_cu) 24251 { 24252 auto it = m_dwarf2_cus.find (per_cu); 24253 if (it == m_dwarf2_cus.end ()) 24254 return nullptr; 24255 24256 return it->second; 24257 } 24258 24259 /* See read.h. */ 24260 24261 void 24262 dwarf2_per_objfile::set_cu (dwarf2_per_cu_data *per_cu, dwarf2_cu *cu) 24263 { 24264 gdb_assert (this->get_cu (per_cu) == nullptr); 24265 24266 m_dwarf2_cus[per_cu] = cu; 24267 } 24268 24269 /* See read.h. */ 24270 24271 void 24272 dwarf2_per_objfile::age_comp_units () 24273 { 24274 /* Start by clearing all marks. */ 24275 for (auto pair : m_dwarf2_cus) 24276 pair.second->mark = false; 24277 24278 /* Traverse all CUs, mark them and their dependencies if used recently 24279 enough. */ 24280 for (auto pair : m_dwarf2_cus) 24281 { 24282 dwarf2_cu *cu = pair.second; 24283 24284 cu->last_used++; 24285 if (cu->last_used <= dwarf_max_cache_age) 24286 dwarf2_mark (cu); 24287 } 24288 24289 /* Delete all CUs still not marked. */ 24290 for (auto it = m_dwarf2_cus.begin (); it != m_dwarf2_cus.end ();) 24291 { 24292 dwarf2_cu *cu = it->second; 24293 24294 if (!cu->mark) 24295 { 24296 delete cu; 24297 it = m_dwarf2_cus.erase (it); 24298 } 24299 else 24300 it++; 24301 } 24302 } 24303 24304 /* See read.h. */ 24305 24306 void 24307 dwarf2_per_objfile::remove_cu (dwarf2_per_cu_data *per_cu) 24308 { 24309 auto it = m_dwarf2_cus.find (per_cu); 24310 if (it == m_dwarf2_cus.end ()) 24311 return; 24312 24313 delete it->second; 24314 24315 m_dwarf2_cus.erase (it); 24316 } 24317 24318 dwarf2_per_objfile::~dwarf2_per_objfile () 24319 { 24320 remove_all_cus (); 24321 } 24322 24323 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer. 24324 We store these in a hash table separate from the DIEs, and preserve them 24325 when the DIEs are flushed out of cache. 24326 24327 The CU "per_cu" pointer is needed because offset alone is not enough to 24328 uniquely identify the type. A file may have multiple .debug_types sections, 24329 or the type may come from a DWO file. Furthermore, while it's more logical 24330 to use per_cu->section+offset, with Fission the section with the data is in 24331 the DWO file but we don't know that section at the point we need it. 24332 We have to use something in dwarf2_per_cu_data (or the pointer to it) 24333 because we can enter the lookup routine, get_die_type_at_offset, from 24334 outside this file, and thus won't necessarily have PER_CU->cu. 24335 Fortunately, PER_CU is stable for the life of the objfile. */ 24336 24337 struct dwarf2_per_cu_offset_and_type 24338 { 24339 const struct dwarf2_per_cu_data *per_cu; 24340 sect_offset sect_off; 24341 struct type *type; 24342 }; 24343 24344 /* Hash function for a dwarf2_per_cu_offset_and_type. */ 24345 24346 static hashval_t 24347 per_cu_offset_and_type_hash (const void *item) 24348 { 24349 const struct dwarf2_per_cu_offset_and_type *ofs 24350 = (const struct dwarf2_per_cu_offset_and_type *) item; 24351 24352 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off); 24353 } 24354 24355 /* Equality function for a dwarf2_per_cu_offset_and_type. */ 24356 24357 static int 24358 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs) 24359 { 24360 const struct dwarf2_per_cu_offset_and_type *ofs_lhs 24361 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs; 24362 const struct dwarf2_per_cu_offset_and_type *ofs_rhs 24363 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs; 24364 24365 return (ofs_lhs->per_cu == ofs_rhs->per_cu 24366 && ofs_lhs->sect_off == ofs_rhs->sect_off); 24367 } 24368 24369 /* Set the type associated with DIE to TYPE. Save it in CU's hash 24370 table if necessary. For convenience, return TYPE. 24371 24372 The DIEs reading must have careful ordering to: 24373 * Not cause infinite loops trying to read in DIEs as a prerequisite for 24374 reading current DIE. 24375 * Not trying to dereference contents of still incompletely read in types 24376 while reading in other DIEs. 24377 * Enable referencing still incompletely read in types just by a pointer to 24378 the type without accessing its fields. 24379 24380 Therefore caller should follow these rules: 24381 * Try to fetch any prerequisite types we may need to build this DIE type 24382 before building the type and calling set_die_type. 24383 * After building type call set_die_type for current DIE as soon as 24384 possible before fetching more types to complete the current type. 24385 * Make the type as complete as possible before fetching more types. */ 24386 24387 static struct type * 24388 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu) 24389 { 24390 dwarf2_per_objfile *per_objfile = cu->per_objfile; 24391 struct dwarf2_per_cu_offset_and_type **slot, ofs; 24392 struct objfile *objfile = per_objfile->objfile; 24393 struct attribute *attr; 24394 struct dynamic_prop prop; 24395 24396 /* For Ada types, make sure that the gnat-specific data is always 24397 initialized (if not already set). There are a few types where 24398 we should not be doing so, because the type-specific area is 24399 already used to hold some other piece of info (eg: TYPE_CODE_FLT 24400 where the type-specific area is used to store the floatformat). 24401 But this is not a problem, because the gnat-specific information 24402 is actually not needed for these types. */ 24403 if (need_gnat_info (cu) 24404 && type->code () != TYPE_CODE_FUNC 24405 && type->code () != TYPE_CODE_FLT 24406 && type->code () != TYPE_CODE_METHODPTR 24407 && type->code () != TYPE_CODE_MEMBERPTR 24408 && type->code () != TYPE_CODE_METHOD 24409 && !HAVE_GNAT_AUX_INFO (type)) 24410 INIT_GNAT_SPECIFIC (type); 24411 24412 /* Read DW_AT_allocated and set in type. */ 24413 attr = dwarf2_attr (die, DW_AT_allocated, cu); 24414 if (attr != NULL) 24415 { 24416 struct type *prop_type = cu->addr_sized_int_type (false); 24417 if (attr_to_dynamic_prop (attr, die, cu, &prop, prop_type)) 24418 type->add_dyn_prop (DYN_PROP_ALLOCATED, prop); 24419 } 24420 24421 /* Read DW_AT_associated and set in type. */ 24422 attr = dwarf2_attr (die, DW_AT_associated, cu); 24423 if (attr != NULL) 24424 { 24425 struct type *prop_type = cu->addr_sized_int_type (false); 24426 if (attr_to_dynamic_prop (attr, die, cu, &prop, prop_type)) 24427 type->add_dyn_prop (DYN_PROP_ASSOCIATED, prop); 24428 } 24429 24430 /* Read DW_AT_data_location and set in type. */ 24431 attr = dwarf2_attr (die, DW_AT_data_location, cu); 24432 if (attr_to_dynamic_prop (attr, die, cu, &prop, cu->addr_type ())) 24433 type->add_dyn_prop (DYN_PROP_DATA_LOCATION, prop); 24434 24435 if (per_objfile->die_type_hash == NULL) 24436 per_objfile->die_type_hash 24437 = htab_up (htab_create_alloc (127, 24438 per_cu_offset_and_type_hash, 24439 per_cu_offset_and_type_eq, 24440 NULL, xcalloc, xfree)); 24441 24442 ofs.per_cu = cu->per_cu; 24443 ofs.sect_off = die->sect_off; 24444 ofs.type = type; 24445 slot = (struct dwarf2_per_cu_offset_and_type **) 24446 htab_find_slot (per_objfile->die_type_hash.get (), &ofs, INSERT); 24447 if (*slot) 24448 complaint (_("A problem internal to GDB: DIE %s has type already set"), 24449 sect_offset_str (die->sect_off)); 24450 *slot = XOBNEW (&objfile->objfile_obstack, 24451 struct dwarf2_per_cu_offset_and_type); 24452 **slot = ofs; 24453 return type; 24454 } 24455 24456 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash, 24457 or return NULL if the die does not have a saved type. */ 24458 24459 static struct type * 24460 get_die_type_at_offset (sect_offset sect_off, 24461 dwarf2_per_cu_data *per_cu, 24462 dwarf2_per_objfile *per_objfile) 24463 { 24464 struct dwarf2_per_cu_offset_and_type *slot, ofs; 24465 24466 if (per_objfile->die_type_hash == NULL) 24467 return NULL; 24468 24469 ofs.per_cu = per_cu; 24470 ofs.sect_off = sect_off; 24471 slot = ((struct dwarf2_per_cu_offset_and_type *) 24472 htab_find (per_objfile->die_type_hash.get (), &ofs)); 24473 if (slot) 24474 return slot->type; 24475 else 24476 return NULL; 24477 } 24478 24479 /* Look up the type for DIE in CU in die_type_hash, 24480 or return NULL if DIE does not have a saved type. */ 24481 24482 static struct type * 24483 get_die_type (struct die_info *die, struct dwarf2_cu *cu) 24484 { 24485 return get_die_type_at_offset (die->sect_off, cu->per_cu, cu->per_objfile); 24486 } 24487 24488 /* Add a dependence relationship from CU to REF_PER_CU. */ 24489 24490 static void 24491 dwarf2_add_dependence (struct dwarf2_cu *cu, 24492 struct dwarf2_per_cu_data *ref_per_cu) 24493 { 24494 void **slot; 24495 24496 if (cu->dependencies == NULL) 24497 cu->dependencies 24498 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer, 24499 NULL, &cu->comp_unit_obstack, 24500 hashtab_obstack_allocate, 24501 dummy_obstack_deallocate); 24502 24503 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT); 24504 if (*slot == NULL) 24505 *slot = ref_per_cu; 24506 } 24507 24508 /* Subroutine of dwarf2_mark to pass to htab_traverse. 24509 Set the mark field in every compilation unit in the 24510 cache that we must keep because we are keeping CU. 24511 24512 DATA is the dwarf2_per_objfile object in which to look up CUs. */ 24513 24514 static int 24515 dwarf2_mark_helper (void **slot, void *data) 24516 { 24517 dwarf2_per_cu_data *per_cu = (dwarf2_per_cu_data *) *slot; 24518 dwarf2_per_objfile *per_objfile = (dwarf2_per_objfile *) data; 24519 dwarf2_cu *cu = per_objfile->get_cu (per_cu); 24520 24521 /* cu->dependencies references may not yet have been ever read if QUIT aborts 24522 reading of the chain. As such dependencies remain valid it is not much 24523 useful to track and undo them during QUIT cleanups. */ 24524 if (cu == nullptr) 24525 return 1; 24526 24527 if (cu->mark) 24528 return 1; 24529 24530 cu->mark = true; 24531 24532 if (cu->dependencies != nullptr) 24533 htab_traverse (cu->dependencies, dwarf2_mark_helper, per_objfile); 24534 24535 return 1; 24536 } 24537 24538 /* Set the mark field in CU and in every other compilation unit in the 24539 cache that we must keep because we are keeping CU. */ 24540 24541 static void 24542 dwarf2_mark (struct dwarf2_cu *cu) 24543 { 24544 if (cu->mark) 24545 return; 24546 24547 cu->mark = true; 24548 24549 if (cu->dependencies != nullptr) 24550 htab_traverse (cu->dependencies, dwarf2_mark_helper, cu->per_objfile); 24551 } 24552 24553 /* Trivial hash function for partial_die_info: the hash value of a DIE 24554 is its offset in .debug_info for this objfile. */ 24555 24556 static hashval_t 24557 partial_die_hash (const void *item) 24558 { 24559 const struct partial_die_info *part_die 24560 = (const struct partial_die_info *) item; 24561 24562 return to_underlying (part_die->sect_off); 24563 } 24564 24565 /* Trivial comparison function for partial_die_info structures: two DIEs 24566 are equal if they have the same offset. */ 24567 24568 static int 24569 partial_die_eq (const void *item_lhs, const void *item_rhs) 24570 { 24571 const struct partial_die_info *part_die_lhs 24572 = (const struct partial_die_info *) item_lhs; 24573 const struct partial_die_info *part_die_rhs 24574 = (const struct partial_die_info *) item_rhs; 24575 24576 return part_die_lhs->sect_off == part_die_rhs->sect_off; 24577 } 24578 24579 struct cmd_list_element *set_dwarf_cmdlist; 24580 struct cmd_list_element *show_dwarf_cmdlist; 24581 24582 static void 24583 show_check_physname (struct ui_file *file, int from_tty, 24584 struct cmd_list_element *c, const char *value) 24585 { 24586 fprintf_filtered (file, 24587 _("Whether to check \"physname\" is %s.\n"), 24588 value); 24589 } 24590 24591 void _initialize_dwarf2_read (); 24592 void 24593 _initialize_dwarf2_read () 24594 { 24595 add_basic_prefix_cmd ("dwarf", class_maintenance, _("\ 24596 Set DWARF specific variables.\n\ 24597 Configure DWARF variables such as the cache size."), 24598 &set_dwarf_cmdlist, "maintenance set dwarf ", 24599 0/*allow-unknown*/, &maintenance_set_cmdlist); 24600 24601 add_show_prefix_cmd ("dwarf", class_maintenance, _("\ 24602 Show DWARF specific variables.\n\ 24603 Show DWARF variables such as the cache size."), 24604 &show_dwarf_cmdlist, "maintenance show dwarf ", 24605 0/*allow-unknown*/, &maintenance_show_cmdlist); 24606 24607 add_setshow_zinteger_cmd ("max-cache-age", class_obscure, 24608 &dwarf_max_cache_age, _("\ 24609 Set the upper bound on the age of cached DWARF compilation units."), _("\ 24610 Show the upper bound on the age of cached DWARF compilation units."), _("\ 24611 A higher limit means that cached compilation units will be stored\n\ 24612 in memory longer, and more total memory will be used. Zero disables\n\ 24613 caching, which can slow down startup."), 24614 NULL, 24615 show_dwarf_max_cache_age, 24616 &set_dwarf_cmdlist, 24617 &show_dwarf_cmdlist); 24618 24619 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\ 24620 Set debugging of the DWARF reader."), _("\ 24621 Show debugging of the DWARF reader."), _("\ 24622 When enabled (non-zero), debugging messages are printed during DWARF\n\ 24623 reading and symtab expansion. A value of 1 (one) provides basic\n\ 24624 information. A value greater than 1 provides more verbose information."), 24625 NULL, 24626 NULL, 24627 &setdebuglist, &showdebuglist); 24628 24629 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\ 24630 Set debugging of the DWARF DIE reader."), _("\ 24631 Show debugging of the DWARF DIE reader."), _("\ 24632 When enabled (non-zero), DIEs are dumped after they are read in.\n\ 24633 The value is the maximum depth to print."), 24634 NULL, 24635 NULL, 24636 &setdebuglist, &showdebuglist); 24637 24638 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\ 24639 Set debugging of the dwarf line reader."), _("\ 24640 Show debugging of the dwarf line reader."), _("\ 24641 When enabled (non-zero), line number entries are dumped as they are read in.\n\ 24642 A value of 1 (one) provides basic information.\n\ 24643 A value greater than 1 provides more verbose information."), 24644 NULL, 24645 NULL, 24646 &setdebuglist, &showdebuglist); 24647 24648 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\ 24649 Set cross-checking of \"physname\" code against demangler."), _("\ 24650 Show cross-checking of \"physname\" code against demangler."), _("\ 24651 When enabled, GDB's internal \"physname\" code is checked against\n\ 24652 the demangler."), 24653 NULL, show_check_physname, 24654 &setdebuglist, &showdebuglist); 24655 24656 add_setshow_boolean_cmd ("use-deprecated-index-sections", 24657 no_class, &use_deprecated_index_sections, _("\ 24658 Set whether to use deprecated gdb_index sections."), _("\ 24659 Show whether to use deprecated gdb_index sections."), _("\ 24660 When enabled, deprecated .gdb_index sections are used anyway.\n\ 24661 Normally they are ignored either because of a missing feature or\n\ 24662 performance issue.\n\ 24663 Warning: This option must be enabled before gdb reads the file."), 24664 NULL, 24665 NULL, 24666 &setlist, &showlist); 24667 24668 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED, 24669 &dwarf2_locexpr_funcs); 24670 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED, 24671 &dwarf2_loclist_funcs); 24672 24673 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK, 24674 &dwarf2_block_frame_base_locexpr_funcs); 24675 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK, 24676 &dwarf2_block_frame_base_loclist_funcs); 24677 24678 #if GDB_SELF_TEST 24679 selftests::register_test ("dw2_expand_symtabs_matching", 24680 selftests::dw2_expand_symtabs_matching::run_test); 24681 selftests::register_test ("dwarf2_find_containing_comp_unit", 24682 selftests::find_containing_comp_unit::run_test); 24683 #endif 24684 } 24685