1 /* DWARF 2 debugging format support for GDB. 2 3 Copyright (C) 1994-2013 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 "bfd.h" 33 #include "elf-bfd.h" 34 #include "symtab.h" 35 #include "gdbtypes.h" 36 #include "objfiles.h" 37 #include "dwarf2.h" 38 #include "buildsym.h" 39 #include "demangle.h" 40 #include "gdb-demangle.h" 41 #include "expression.h" 42 #include "filenames.h" /* for DOSish file names */ 43 #include "macrotab.h" 44 #include "language.h" 45 #include "complaints.h" 46 #include "bcache.h" 47 #include "dwarf2expr.h" 48 #include "dwarf2loc.h" 49 #include "cp-support.h" 50 #include "hashtab.h" 51 #include "command.h" 52 #include "gdbcmd.h" 53 #include "block.h" 54 #include "addrmap.h" 55 #include "typeprint.h" 56 #include "jv-lang.h" 57 #include "psympriv.h" 58 #include "exceptions.h" 59 #include "gdb_stat.h" 60 #include "completer.h" 61 #include "vec.h" 62 #include "c-lang.h" 63 #include "go-lang.h" 64 #include "valprint.h" 65 #include "gdbcore.h" /* for gnutarget */ 66 #include "gdb/gdb-index.h" 67 #include <ctype.h> 68 #include "gdb_bfd.h" 69 #include "f-lang.h" 70 #include "source.h" 71 72 #include <fcntl.h> 73 #include "gdb_string.h" 74 #include "gdb_assert.h" 75 #include <sys/types.h> 76 77 typedef struct symbol *symbolp; 78 DEF_VEC_P (symbolp); 79 80 /* When non-zero, print basic high level tracing messages. 81 This is in contrast to the low level DIE reading of dwarf2_die_debug. */ 82 static int dwarf2_read_debug = 0; 83 84 /* When non-zero, dump DIEs after they are read in. */ 85 static unsigned int dwarf2_die_debug = 0; 86 87 /* When non-zero, cross-check physname against demangler. */ 88 static int check_physname = 0; 89 90 /* When non-zero, do not reject deprecated .gdb_index sections. */ 91 static int use_deprecated_index_sections = 0; 92 93 static const struct objfile_data *dwarf2_objfile_data_key; 94 95 struct dwarf2_section_info 96 { 97 asection *asection; 98 gdb_byte *buffer; 99 bfd_size_type size; 100 /* True if we have tried to read this section. */ 101 int readin; 102 }; 103 104 typedef struct dwarf2_section_info dwarf2_section_info_def; 105 DEF_VEC_O (dwarf2_section_info_def); 106 107 /* All offsets in the index are of this type. It must be 108 architecture-independent. */ 109 typedef uint32_t offset_type; 110 111 DEF_VEC_I (offset_type); 112 113 /* Ensure only legit values are used. */ 114 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \ 115 do { \ 116 gdb_assert ((unsigned int) (value) <= 1); \ 117 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \ 118 } while (0) 119 120 /* Ensure only legit values are used. */ 121 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \ 122 do { \ 123 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \ 124 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \ 125 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \ 126 } while (0) 127 128 /* Ensure we don't use more than the alloted nuber of bits for the CU. */ 129 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \ 130 do { \ 131 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \ 132 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \ 133 } while (0) 134 135 /* A description of the mapped index. The file format is described in 136 a comment by the code that writes the index. */ 137 struct mapped_index 138 { 139 /* Index data format version. */ 140 int version; 141 142 /* The total length of the buffer. */ 143 off_t total_size; 144 145 /* A pointer to the address table data. */ 146 const gdb_byte *address_table; 147 148 /* Size of the address table data in bytes. */ 149 offset_type address_table_size; 150 151 /* The symbol table, implemented as a hash table. */ 152 const offset_type *symbol_table; 153 154 /* Size in slots, each slot is 2 offset_types. */ 155 offset_type symbol_table_slots; 156 157 /* A pointer to the constant pool. */ 158 const char *constant_pool; 159 }; 160 161 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr; 162 DEF_VEC_P (dwarf2_per_cu_ptr); 163 164 /* Collection of data recorded per objfile. 165 This hangs off of dwarf2_objfile_data_key. */ 166 167 struct dwarf2_per_objfile 168 { 169 struct dwarf2_section_info info; 170 struct dwarf2_section_info abbrev; 171 struct dwarf2_section_info line; 172 struct dwarf2_section_info loc; 173 struct dwarf2_section_info macinfo; 174 struct dwarf2_section_info macro; 175 struct dwarf2_section_info str; 176 struct dwarf2_section_info ranges; 177 struct dwarf2_section_info addr; 178 struct dwarf2_section_info frame; 179 struct dwarf2_section_info eh_frame; 180 struct dwarf2_section_info gdb_index; 181 182 VEC (dwarf2_section_info_def) *types; 183 184 /* Back link. */ 185 struct objfile *objfile; 186 187 /* Table of all the compilation units. This is used to locate 188 the target compilation unit of a particular reference. */ 189 struct dwarf2_per_cu_data **all_comp_units; 190 191 /* The number of compilation units in ALL_COMP_UNITS. */ 192 int n_comp_units; 193 194 /* The number of .debug_types-related CUs. */ 195 int n_type_units; 196 197 /* The .debug_types-related CUs (TUs). */ 198 struct signatured_type **all_type_units; 199 200 /* The number of entries in all_type_unit_groups. */ 201 int n_type_unit_groups; 202 203 /* Table of type unit groups. 204 This exists to make it easy to iterate over all CUs and TU groups. */ 205 struct type_unit_group **all_type_unit_groups; 206 207 /* Table of struct type_unit_group objects. 208 The hash key is the DW_AT_stmt_list value. */ 209 htab_t type_unit_groups; 210 211 /* A table mapping .debug_types signatures to its signatured_type entry. 212 This is NULL if the .debug_types section hasn't been read in yet. */ 213 htab_t signatured_types; 214 215 /* Type unit statistics, to see how well the scaling improvements 216 are doing. */ 217 struct tu_stats 218 { 219 int nr_uniq_abbrev_tables; 220 int nr_symtabs; 221 int nr_symtab_sharers; 222 int nr_stmt_less_type_units; 223 } tu_stats; 224 225 /* A chain of compilation units that are currently read in, so that 226 they can be freed later. */ 227 struct dwarf2_per_cu_data *read_in_chain; 228 229 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects. 230 This is NULL if the table hasn't been allocated yet. */ 231 htab_t dwo_files; 232 233 /* Non-zero if we've check for whether there is a DWP file. */ 234 int dwp_checked; 235 236 /* The DWP file if there is one, or NULL. */ 237 struct dwp_file *dwp_file; 238 239 /* The shared '.dwz' file, if one exists. This is used when the 240 original data was compressed using 'dwz -m'. */ 241 struct dwz_file *dwz_file; 242 243 /* A flag indicating wether this objfile has a section loaded at a 244 VMA of 0. */ 245 int has_section_at_zero; 246 247 /* True if we are using the mapped index, 248 or we are faking it for OBJF_READNOW's sake. */ 249 unsigned char using_index; 250 251 /* The mapped index, or NULL if .gdb_index is missing or not being used. */ 252 struct mapped_index *index_table; 253 254 /* When using index_table, this keeps track of all quick_file_names entries. 255 TUs typically share line table entries with a CU, so we maintain a 256 separate table of all line table entries to support the sharing. 257 Note that while there can be way more TUs than CUs, we've already 258 sorted all the TUs into "type unit groups", grouped by their 259 DW_AT_stmt_list value. Therefore the only sharing done here is with a 260 CU and its associated TU group if there is one. */ 261 htab_t quick_file_names_table; 262 263 /* Set during partial symbol reading, to prevent queueing of full 264 symbols. */ 265 int reading_partial_symbols; 266 267 /* Table mapping type DIEs to their struct type *. 268 This is NULL if not allocated yet. 269 The mapping is done via (CU/TU signature + DIE offset) -> type. */ 270 htab_t die_type_hash; 271 272 /* The CUs we recently read. */ 273 VEC (dwarf2_per_cu_ptr) *just_read_cus; 274 }; 275 276 static struct dwarf2_per_objfile *dwarf2_per_objfile; 277 278 /* Default names of the debugging sections. */ 279 280 /* Note that if the debugging section has been compressed, it might 281 have a name like .zdebug_info. */ 282 283 static const struct dwarf2_debug_sections dwarf2_elf_names = 284 { 285 { ".debug_info", ".zdebug_info" }, 286 { ".debug_abbrev", ".zdebug_abbrev" }, 287 { ".debug_line", ".zdebug_line" }, 288 { ".debug_loc", ".zdebug_loc" }, 289 { ".debug_macinfo", ".zdebug_macinfo" }, 290 { ".debug_macro", ".zdebug_macro" }, 291 { ".debug_str", ".zdebug_str" }, 292 { ".debug_ranges", ".zdebug_ranges" }, 293 { ".debug_types", ".zdebug_types" }, 294 { ".debug_addr", ".zdebug_addr" }, 295 { ".debug_frame", ".zdebug_frame" }, 296 { ".eh_frame", NULL }, 297 { ".gdb_index", ".zgdb_index" }, 298 23 299 }; 300 301 /* List of DWO/DWP sections. */ 302 303 static const struct dwop_section_names 304 { 305 struct dwarf2_section_names abbrev_dwo; 306 struct dwarf2_section_names info_dwo; 307 struct dwarf2_section_names line_dwo; 308 struct dwarf2_section_names loc_dwo; 309 struct dwarf2_section_names macinfo_dwo; 310 struct dwarf2_section_names macro_dwo; 311 struct dwarf2_section_names str_dwo; 312 struct dwarf2_section_names str_offsets_dwo; 313 struct dwarf2_section_names types_dwo; 314 struct dwarf2_section_names cu_index; 315 struct dwarf2_section_names tu_index; 316 } 317 dwop_section_names = 318 { 319 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" }, 320 { ".debug_info.dwo", ".zdebug_info.dwo" }, 321 { ".debug_line.dwo", ".zdebug_line.dwo" }, 322 { ".debug_loc.dwo", ".zdebug_loc.dwo" }, 323 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" }, 324 { ".debug_macro.dwo", ".zdebug_macro.dwo" }, 325 { ".debug_str.dwo", ".zdebug_str.dwo" }, 326 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" }, 327 { ".debug_types.dwo", ".zdebug_types.dwo" }, 328 { ".debug_cu_index", ".zdebug_cu_index" }, 329 { ".debug_tu_index", ".zdebug_tu_index" }, 330 }; 331 332 /* local data types */ 333 334 /* The data in a compilation unit header, after target2host 335 translation, looks like this. */ 336 struct comp_unit_head 337 { 338 unsigned int length; 339 short version; 340 unsigned char addr_size; 341 unsigned char signed_addr_p; 342 sect_offset abbrev_offset; 343 344 /* Size of file offsets; either 4 or 8. */ 345 unsigned int offset_size; 346 347 /* Size of the length field; either 4 or 12. */ 348 unsigned int initial_length_size; 349 350 /* Offset to the first byte of this compilation unit header in the 351 .debug_info section, for resolving relative reference dies. */ 352 sect_offset offset; 353 354 /* Offset to first die in this cu from the start of the cu. 355 This will be the first byte following the compilation unit header. */ 356 cu_offset first_die_offset; 357 }; 358 359 /* Type used for delaying computation of method physnames. 360 See comments for compute_delayed_physnames. */ 361 struct delayed_method_info 362 { 363 /* The type to which the method is attached, i.e., its parent class. */ 364 struct type *type; 365 366 /* The index of the method in the type's function fieldlists. */ 367 int fnfield_index; 368 369 /* The index of the method in the fieldlist. */ 370 int index; 371 372 /* The name of the DIE. */ 373 const char *name; 374 375 /* The DIE associated with this method. */ 376 struct die_info *die; 377 }; 378 379 typedef struct delayed_method_info delayed_method_info; 380 DEF_VEC_O (delayed_method_info); 381 382 /* Internal state when decoding a particular compilation unit. */ 383 struct dwarf2_cu 384 { 385 /* The objfile containing this compilation unit. */ 386 struct objfile *objfile; 387 388 /* The header of the compilation unit. */ 389 struct comp_unit_head header; 390 391 /* Base address of this compilation unit. */ 392 CORE_ADDR base_address; 393 394 /* Non-zero if base_address has been set. */ 395 int base_known; 396 397 /* The language we are debugging. */ 398 enum language language; 399 const struct language_defn *language_defn; 400 401 const char *producer; 402 403 /* The generic symbol table building routines have separate lists for 404 file scope symbols and all all other scopes (local scopes). So 405 we need to select the right one to pass to add_symbol_to_list(). 406 We do it by keeping a pointer to the correct list in list_in_scope. 407 408 FIXME: The original dwarf code just treated the file scope as the 409 first local scope, and all other local scopes as nested local 410 scopes, and worked fine. Check to see if we really need to 411 distinguish these in buildsym.c. */ 412 struct pending **list_in_scope; 413 414 /* The abbrev table for this CU. 415 Normally this points to the abbrev table in the objfile. 416 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */ 417 struct abbrev_table *abbrev_table; 418 419 /* Hash table holding all the loaded partial DIEs 420 with partial_die->offset.SECT_OFF as hash. */ 421 htab_t partial_dies; 422 423 /* Storage for things with the same lifetime as this read-in compilation 424 unit, including partial DIEs. */ 425 struct obstack comp_unit_obstack; 426 427 /* When multiple dwarf2_cu structures are living in memory, this field 428 chains them all together, so that they can be released efficiently. 429 We will probably also want a generation counter so that most-recently-used 430 compilation units are cached... */ 431 struct dwarf2_per_cu_data *read_in_chain; 432 433 /* Backchain to our per_cu entry if the tree has been built. */ 434 struct dwarf2_per_cu_data *per_cu; 435 436 /* How many compilation units ago was this CU last referenced? */ 437 int last_used; 438 439 /* A hash table of DIE cu_offset for following references with 440 die_info->offset.sect_off as hash. */ 441 htab_t die_hash; 442 443 /* Full DIEs if read in. */ 444 struct die_info *dies; 445 446 /* A set of pointers to dwarf2_per_cu_data objects for compilation 447 units referenced by this one. Only set during full symbol processing; 448 partial symbol tables do not have dependencies. */ 449 htab_t dependencies; 450 451 /* Header data from the line table, during full symbol processing. */ 452 struct line_header *line_header; 453 454 /* A list of methods which need to have physnames computed 455 after all type information has been read. */ 456 VEC (delayed_method_info) *method_list; 457 458 /* To be copied to symtab->call_site_htab. */ 459 htab_t call_site_htab; 460 461 /* Non-NULL if this CU came from a DWO file. 462 There is an invariant here that is important to remember: 463 Except for attributes copied from the top level DIE in the "main" 464 (or "stub") file in preparation for reading the DWO file 465 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU. 466 Either there isn't a DWO file (in which case this is NULL and the point 467 is moot), or there is and either we're not going to read it (in which 468 case this is NULL) or there is and we are reading it (in which case this 469 is non-NULL). */ 470 struct dwo_unit *dwo_unit; 471 472 /* The DW_AT_addr_base attribute if present, zero otherwise 473 (zero is a valid value though). 474 Note this value comes from the stub CU/TU's DIE. */ 475 ULONGEST addr_base; 476 477 /* The DW_AT_ranges_base attribute if present, zero otherwise 478 (zero is a valid value though). 479 Note this value comes from the stub CU/TU's DIE. 480 Also note that the value is zero in the non-DWO case so this value can 481 be used without needing to know whether DWO files are in use or not. 482 N.B. This does not apply to DW_AT_ranges appearing in 483 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever 484 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then 485 DW_AT_ranges_base *would* have to be applied, and we'd have to care 486 whether the DW_AT_ranges attribute came from the skeleton or DWO. */ 487 ULONGEST ranges_base; 488 489 /* Mark used when releasing cached dies. */ 490 unsigned int mark : 1; 491 492 /* This CU references .debug_loc. See the symtab->locations_valid field. 493 This test is imperfect as there may exist optimized debug code not using 494 any location list and still facing inlining issues if handled as 495 unoptimized code. For a future better test see GCC PR other/32998. */ 496 unsigned int has_loclist : 1; 497 498 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set 499 if all the producer_is_* fields are valid. This information is cached 500 because profiling CU expansion showed excessive time spent in 501 producer_is_gxx_lt_4_6. */ 502 unsigned int checked_producer : 1; 503 unsigned int producer_is_gxx_lt_4_6 : 1; 504 unsigned int producer_is_gcc_lt_4_3 : 1; 505 unsigned int producer_is_icc : 1; 506 507 /* When set, the file that we're processing is known to have 508 debugging info for C++ namespaces. GCC 3.3.x did not produce 509 this information, but later versions do. */ 510 511 unsigned int processing_has_namespace_info : 1; 512 }; 513 514 /* Persistent data held for a compilation unit, even when not 515 processing it. We put a pointer to this structure in the 516 read_symtab_private field of the psymtab. */ 517 518 struct dwarf2_per_cu_data 519 { 520 /* The start offset and length of this compilation unit. 521 NOTE: Unlike comp_unit_head.length, this length includes 522 initial_length_size. 523 If the DIE refers to a DWO file, this is always of the original die, 524 not the DWO file. */ 525 sect_offset offset; 526 unsigned int length; 527 528 /* Flag indicating this compilation unit will be read in before 529 any of the current compilation units are processed. */ 530 unsigned int queued : 1; 531 532 /* This flag will be set when reading partial DIEs if we need to load 533 absolutely all DIEs for this compilation unit, instead of just the ones 534 we think are interesting. It gets set if we look for a DIE in the 535 hash table and don't find it. */ 536 unsigned int load_all_dies : 1; 537 538 /* Non-zero if this CU is from .debug_types. */ 539 unsigned int is_debug_types : 1; 540 541 /* Non-zero if this CU is from the .dwz file. */ 542 unsigned int is_dwz : 1; 543 544 /* The section this CU/TU lives in. 545 If the DIE refers to a DWO file, this is always the original die, 546 not the DWO file. */ 547 struct dwarf2_section_info *info_or_types_section; 548 549 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out 550 of the CU cache it gets reset to NULL again. */ 551 struct dwarf2_cu *cu; 552 553 /* The corresponding objfile. 554 Normally we can get the objfile from dwarf2_per_objfile. 555 However we can enter this file with just a "per_cu" handle. */ 556 struct objfile *objfile; 557 558 /* When using partial symbol tables, the 'psymtab' field is active. 559 Otherwise the 'quick' field is active. */ 560 union 561 { 562 /* The partial symbol table associated with this compilation unit, 563 or NULL for unread partial units. */ 564 struct partial_symtab *psymtab; 565 566 /* Data needed by the "quick" functions. */ 567 struct dwarf2_per_cu_quick_data *quick; 568 } v; 569 570 /* The CUs we import using DW_TAG_imported_unit. This is filled in 571 while reading psymtabs, used to compute the psymtab dependencies, 572 and then cleared. Then it is filled in again while reading full 573 symbols, and only deleted when the objfile is destroyed. 574 575 This is also used to work around a difference between the way gold 576 generates .gdb_index version <=7 and the way gdb does. Arguably this 577 is a gold bug. For symbols coming from TUs, gold records in the index 578 the CU that includes the TU instead of the TU itself. This breaks 579 dw2_lookup_symbol: It assumes that if the index says symbol X lives 580 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y 581 will find X. Alas TUs live in their own symtab, so after expanding CU Y 582 we need to look in TU Z to find X. Fortunately, this is akin to 583 DW_TAG_imported_unit, so we just use the same mechanism: For 584 .gdb_index version <=7 this also records the TUs that the CU referred 585 to. Concurrently with this change gdb was modified to emit version 8 586 indices so we only pay a price for gold generated indices. */ 587 VEC (dwarf2_per_cu_ptr) *imported_symtabs; 588 589 /* Type units are grouped by their DW_AT_stmt_list entry so that they 590 can share them. If this is a TU, this points to the containing 591 symtab. */ 592 struct type_unit_group *type_unit_group; 593 }; 594 595 /* Entry in the signatured_types hash table. */ 596 597 struct signatured_type 598 { 599 /* The "per_cu" object of this type. 600 N.B.: This is the first member so that it's easy to convert pointers 601 between them. */ 602 struct dwarf2_per_cu_data per_cu; 603 604 /* The type's signature. */ 605 ULONGEST signature; 606 607 /* Offset in the TU of the type's DIE, as read from the TU header. 608 If the definition lives in a DWO file, this value is unusable. */ 609 cu_offset type_offset_in_tu; 610 611 /* Offset in the section of the type's DIE. 612 If the definition lives in a DWO file, this is the offset in the 613 .debug_types.dwo section. 614 The value is zero until the actual value is known. 615 Zero is otherwise not a valid section offset. */ 616 sect_offset type_offset_in_section; 617 }; 618 619 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list. 620 This includes type_unit_group and quick_file_names. */ 621 622 struct stmt_list_hash 623 { 624 /* The DWO unit this table is from or NULL if there is none. */ 625 struct dwo_unit *dwo_unit; 626 627 /* Offset in .debug_line or .debug_line.dwo. */ 628 sect_offset line_offset; 629 }; 630 631 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to 632 an object of this type. */ 633 634 struct type_unit_group 635 { 636 /* dwarf2read.c's main "handle" on the 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 This PER_CU is recognized by having no section. */ 641 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->info_or_types_section == NULL) 642 struct dwarf2_per_cu_data per_cu; 643 644 union 645 { 646 /* The TUs that share this DW_AT_stmt_list entry. 647 This is added to while parsing type units to build partial symtabs, 648 and is deleted afterwards and not used again. */ 649 VEC (dwarf2_per_cu_ptr) *tus; 650 651 /* When reading the line table in "quick" functions, we need a real TU. 652 Any will do, we know they all share the same DW_AT_stmt_list entry. 653 For simplicity's sake, we pick the first one. */ 654 struct dwarf2_per_cu_data *first_tu; 655 } t; 656 657 /* The primary symtab. 658 Type units in a group needn't all be defined in the same source file, 659 so we create an essentially anonymous symtab as the primary symtab. */ 660 struct symtab *primary_symtab; 661 662 /* The data used to construct the hash key. */ 663 struct stmt_list_hash hash; 664 665 /* The number of symtabs from the line header. 666 The value here must match line_header.num_file_names. */ 667 unsigned int num_symtabs; 668 669 /* The symbol tables for this TU (obtained from the files listed in 670 DW_AT_stmt_list). 671 WARNING: The order of entries here must match the order of entries 672 in the line header. After the first TU using this type_unit_group, the 673 line header for the subsequent TUs is recreated from this. This is done 674 because we need to use the same symtabs for each TU using the same 675 DW_AT_stmt_list value. Also note that symtabs may be repeated here, 676 there's no guarantee the line header doesn't have duplicate entries. */ 677 struct symtab **symtabs; 678 }; 679 680 /* These sections are what may appear in a DWO file. */ 681 682 struct dwo_sections 683 { 684 struct dwarf2_section_info abbrev; 685 struct dwarf2_section_info line; 686 struct dwarf2_section_info loc; 687 struct dwarf2_section_info macinfo; 688 struct dwarf2_section_info macro; 689 struct dwarf2_section_info str; 690 struct dwarf2_section_info str_offsets; 691 /* In the case of a virtual DWO file, these two are unused. */ 692 struct dwarf2_section_info info; 693 VEC (dwarf2_section_info_def) *types; 694 }; 695 696 /* Common bits of DWO CUs/TUs. */ 697 698 struct dwo_unit 699 { 700 /* Backlink to the containing struct dwo_file. */ 701 struct dwo_file *dwo_file; 702 703 /* The "id" that distinguishes this CU/TU. 704 .debug_info calls this "dwo_id", .debug_types calls this "signature". 705 Since signatures came first, we stick with it for consistency. */ 706 ULONGEST signature; 707 708 /* The section this CU/TU lives in, in the DWO file. */ 709 struct dwarf2_section_info *info_or_types_section; 710 711 /* Same as dwarf2_per_cu_data:{offset,length} but for the DWO section. */ 712 sect_offset offset; 713 unsigned int length; 714 715 /* For types, offset in the type's DIE of the type defined by this TU. */ 716 cu_offset type_offset_in_tu; 717 }; 718 719 /* Data for one DWO file. 720 This includes virtual DWO files that have been packaged into a 721 DWP file. */ 722 723 struct dwo_file 724 { 725 /* The DW_AT_GNU_dwo_name attribute. This is the hash key. 726 For virtual DWO files the name is constructed from the section offsets 727 of abbrev,line,loc,str_offsets so that we combine virtual DWO files 728 from related CU+TUs. */ 729 const char *name; 730 731 /* The bfd, when the file is open. Otherwise this is NULL. 732 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */ 733 bfd *dbfd; 734 735 /* Section info for this file. */ 736 struct dwo_sections sections; 737 738 /* Table of CUs in the file. 739 Each element is a struct dwo_unit. */ 740 htab_t cus; 741 742 /* Table of TUs in the file. 743 Each element is a struct dwo_unit. */ 744 htab_t tus; 745 }; 746 747 /* These sections are what may appear in a DWP file. */ 748 749 struct dwp_sections 750 { 751 struct dwarf2_section_info str; 752 struct dwarf2_section_info cu_index; 753 struct dwarf2_section_info tu_index; 754 /* The .debug_info.dwo, .debug_types.dwo, and other sections are referenced 755 by section number. We don't need to record them here. */ 756 }; 757 758 /* These sections are what may appear in a virtual DWO file. */ 759 760 struct virtual_dwo_sections 761 { 762 struct dwarf2_section_info abbrev; 763 struct dwarf2_section_info line; 764 struct dwarf2_section_info loc; 765 struct dwarf2_section_info macinfo; 766 struct dwarf2_section_info macro; 767 struct dwarf2_section_info str_offsets; 768 /* Each DWP hash table entry records one CU or one TU. 769 That is recorded here, and copied to dwo_unit.info_or_types_section. */ 770 struct dwarf2_section_info info_or_types; 771 }; 772 773 /* Contents of DWP hash tables. */ 774 775 struct dwp_hash_table 776 { 777 uint32_t nr_units, nr_slots; 778 const gdb_byte *hash_table, *unit_table, *section_pool; 779 }; 780 781 /* Data for one DWP file. */ 782 783 struct dwp_file 784 { 785 /* Name of the file. */ 786 const char *name; 787 788 /* The bfd, when the file is open. Otherwise this is NULL. */ 789 bfd *dbfd; 790 791 /* Section info for this file. */ 792 struct dwp_sections sections; 793 794 /* Table of CUs in the file. */ 795 const struct dwp_hash_table *cus; 796 797 /* Table of TUs in the file. */ 798 const struct dwp_hash_table *tus; 799 800 /* Table of loaded CUs/TUs. Each entry is a struct dwo_unit *. */ 801 htab_t loaded_cutus; 802 803 /* Table to map ELF section numbers to their sections. */ 804 unsigned int num_sections; 805 asection **elf_sections; 806 }; 807 808 /* This represents a '.dwz' file. */ 809 810 struct dwz_file 811 { 812 /* A dwz file can only contain a few sections. */ 813 struct dwarf2_section_info abbrev; 814 struct dwarf2_section_info info; 815 struct dwarf2_section_info str; 816 struct dwarf2_section_info line; 817 struct dwarf2_section_info macro; 818 struct dwarf2_section_info gdb_index; 819 820 /* The dwz's BFD. */ 821 bfd *dwz_bfd; 822 }; 823 824 /* Struct used to pass misc. parameters to read_die_and_children, et 825 al. which are used for both .debug_info and .debug_types dies. 826 All parameters here are unchanging for the life of the call. This 827 struct exists to abstract away the constant parameters of die reading. */ 828 829 struct die_reader_specs 830 { 831 /* die_section->asection->owner. */ 832 bfd* abfd; 833 834 /* The CU of the DIE we are parsing. */ 835 struct dwarf2_cu *cu; 836 837 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */ 838 struct dwo_file *dwo_file; 839 840 /* The section the die comes from. 841 This is either .debug_info or .debug_types, or the .dwo variants. */ 842 struct dwarf2_section_info *die_section; 843 844 /* die_section->buffer. */ 845 gdb_byte *buffer; 846 847 /* The end of the buffer. */ 848 const gdb_byte *buffer_end; 849 }; 850 851 /* Type of function passed to init_cutu_and_read_dies, et.al. */ 852 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader, 853 gdb_byte *info_ptr, 854 struct die_info *comp_unit_die, 855 int has_children, 856 void *data); 857 858 /* The line number information for a compilation unit (found in the 859 .debug_line section) begins with a "statement program header", 860 which contains the following information. */ 861 struct line_header 862 { 863 unsigned int total_length; 864 unsigned short version; 865 unsigned int header_length; 866 unsigned char minimum_instruction_length; 867 unsigned char maximum_ops_per_instruction; 868 unsigned char default_is_stmt; 869 int line_base; 870 unsigned char line_range; 871 unsigned char opcode_base; 872 873 /* standard_opcode_lengths[i] is the number of operands for the 874 standard opcode whose value is i. This means that 875 standard_opcode_lengths[0] is unused, and the last meaningful 876 element is standard_opcode_lengths[opcode_base - 1]. */ 877 unsigned char *standard_opcode_lengths; 878 879 /* The include_directories table. NOTE! These strings are not 880 allocated with xmalloc; instead, they are pointers into 881 debug_line_buffer. If you try to free them, `free' will get 882 indigestion. */ 883 unsigned int num_include_dirs, include_dirs_size; 884 char **include_dirs; 885 886 /* The file_names table. NOTE! These strings are not allocated 887 with xmalloc; instead, they are pointers into debug_line_buffer. 888 Don't try to free them directly. */ 889 unsigned int num_file_names, file_names_size; 890 struct file_entry 891 { 892 char *name; 893 unsigned int dir_index; 894 unsigned int mod_time; 895 unsigned int length; 896 int included_p; /* Non-zero if referenced by the Line Number Program. */ 897 struct symtab *symtab; /* The associated symbol table, if any. */ 898 } *file_names; 899 900 /* The start and end of the statement program following this 901 header. These point into dwarf2_per_objfile->line_buffer. */ 902 gdb_byte *statement_program_start, *statement_program_end; 903 }; 904 905 /* When we construct a partial symbol table entry we only 906 need this much information. */ 907 struct partial_die_info 908 { 909 /* Offset of this DIE. */ 910 sect_offset offset; 911 912 /* DWARF-2 tag for this DIE. */ 913 ENUM_BITFIELD(dwarf_tag) tag : 16; 914 915 /* Assorted flags describing the data found in this DIE. */ 916 unsigned int has_children : 1; 917 unsigned int is_external : 1; 918 unsigned int is_declaration : 1; 919 unsigned int has_type : 1; 920 unsigned int has_specification : 1; 921 unsigned int has_pc_info : 1; 922 unsigned int may_be_inlined : 1; 923 924 /* Flag set if the SCOPE field of this structure has been 925 computed. */ 926 unsigned int scope_set : 1; 927 928 /* Flag set if the DIE has a byte_size attribute. */ 929 unsigned int has_byte_size : 1; 930 931 /* Flag set if any of the DIE's children are template arguments. */ 932 unsigned int has_template_arguments : 1; 933 934 /* Flag set if fixup_partial_die has been called on this die. */ 935 unsigned int fixup_called : 1; 936 937 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */ 938 unsigned int is_dwz : 1; 939 940 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */ 941 unsigned int spec_is_dwz : 1; 942 943 /* The name of this DIE. Normally the value of DW_AT_name, but 944 sometimes a default name for unnamed DIEs. */ 945 const char *name; 946 947 /* The linkage name, if present. */ 948 const char *linkage_name; 949 950 /* The scope to prepend to our children. This is generally 951 allocated on the comp_unit_obstack, so will disappear 952 when this compilation unit leaves the cache. */ 953 const char *scope; 954 955 /* Some data associated with the partial DIE. The tag determines 956 which field is live. */ 957 union 958 { 959 /* The location description associated with this DIE, if any. */ 960 struct dwarf_block *locdesc; 961 /* The offset of an import, for DW_TAG_imported_unit. */ 962 sect_offset offset; 963 } d; 964 965 /* If HAS_PC_INFO, the PC range associated with this DIE. */ 966 CORE_ADDR lowpc; 967 CORE_ADDR highpc; 968 969 /* Pointer into the info_buffer (or types_buffer) pointing at the target of 970 DW_AT_sibling, if any. */ 971 /* NOTE: This member isn't strictly necessary, read_partial_die could 972 return DW_AT_sibling values to its caller load_partial_dies. */ 973 gdb_byte *sibling; 974 975 /* If HAS_SPECIFICATION, the offset of the DIE referred to by 976 DW_AT_specification (or DW_AT_abstract_origin or 977 DW_AT_extension). */ 978 sect_offset spec_offset; 979 980 /* Pointers to this DIE's parent, first child, and next sibling, 981 if any. */ 982 struct partial_die_info *die_parent, *die_child, *die_sibling; 983 }; 984 985 /* This data structure holds the information of an abbrev. */ 986 struct abbrev_info 987 { 988 unsigned int number; /* number identifying abbrev */ 989 enum dwarf_tag tag; /* dwarf tag */ 990 unsigned short has_children; /* boolean */ 991 unsigned short num_attrs; /* number of attributes */ 992 struct attr_abbrev *attrs; /* an array of attribute descriptions */ 993 struct abbrev_info *next; /* next in chain */ 994 }; 995 996 struct attr_abbrev 997 { 998 ENUM_BITFIELD(dwarf_attribute) name : 16; 999 ENUM_BITFIELD(dwarf_form) form : 16; 1000 }; 1001 1002 /* Size of abbrev_table.abbrev_hash_table. */ 1003 #define ABBREV_HASH_SIZE 121 1004 1005 /* Top level data structure to contain an abbreviation table. */ 1006 1007 struct abbrev_table 1008 { 1009 /* Where the abbrev table came from. 1010 This is used as a sanity check when the table is used. */ 1011 sect_offset offset; 1012 1013 /* Storage for the abbrev table. */ 1014 struct obstack abbrev_obstack; 1015 1016 /* Hash table of abbrevs. 1017 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack. 1018 It could be statically allocated, but the previous code didn't so we 1019 don't either. */ 1020 struct abbrev_info **abbrevs; 1021 }; 1022 1023 /* Attributes have a name and a value. */ 1024 struct attribute 1025 { 1026 ENUM_BITFIELD(dwarf_attribute) name : 16; 1027 ENUM_BITFIELD(dwarf_form) form : 15; 1028 1029 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This 1030 field should be in u.str (existing only for DW_STRING) but it is kept 1031 here for better struct attribute alignment. */ 1032 unsigned int string_is_canonical : 1; 1033 1034 union 1035 { 1036 const char *str; 1037 struct dwarf_block *blk; 1038 ULONGEST unsnd; 1039 LONGEST snd; 1040 CORE_ADDR addr; 1041 struct signatured_type *signatured_type; 1042 } 1043 u; 1044 }; 1045 1046 /* This data structure holds a complete die structure. */ 1047 struct die_info 1048 { 1049 /* DWARF-2 tag for this DIE. */ 1050 ENUM_BITFIELD(dwarf_tag) tag : 16; 1051 1052 /* Number of attributes */ 1053 unsigned char num_attrs; 1054 1055 /* True if we're presently building the full type name for the 1056 type derived from this DIE. */ 1057 unsigned char building_fullname : 1; 1058 1059 /* Abbrev number */ 1060 unsigned int abbrev; 1061 1062 /* Offset in .debug_info or .debug_types section. */ 1063 sect_offset offset; 1064 1065 /* The dies in a compilation unit form an n-ary tree. PARENT 1066 points to this die's parent; CHILD points to the first child of 1067 this node; and all the children of a given node are chained 1068 together via their SIBLING fields. */ 1069 struct die_info *child; /* Its first child, if any. */ 1070 struct die_info *sibling; /* Its next sibling, if any. */ 1071 struct die_info *parent; /* Its parent, if any. */ 1072 1073 /* An array of attributes, with NUM_ATTRS elements. There may be 1074 zero, but it's not common and zero-sized arrays are not 1075 sufficiently portable C. */ 1076 struct attribute attrs[1]; 1077 }; 1078 1079 /* Get at parts of an attribute structure. */ 1080 1081 #define DW_STRING(attr) ((attr)->u.str) 1082 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical) 1083 #define DW_UNSND(attr) ((attr)->u.unsnd) 1084 #define DW_BLOCK(attr) ((attr)->u.blk) 1085 #define DW_SND(attr) ((attr)->u.snd) 1086 #define DW_ADDR(attr) ((attr)->u.addr) 1087 #define DW_SIGNATURED_TYPE(attr) ((attr)->u.signatured_type) 1088 1089 /* Blocks are a bunch of untyped bytes. */ 1090 struct dwarf_block 1091 { 1092 size_t size; 1093 1094 /* Valid only if SIZE is not zero. */ 1095 gdb_byte *data; 1096 }; 1097 1098 #ifndef ATTR_ALLOC_CHUNK 1099 #define ATTR_ALLOC_CHUNK 4 1100 #endif 1101 1102 /* Allocate fields for structs, unions and enums in this size. */ 1103 #ifndef DW_FIELD_ALLOC_CHUNK 1104 #define DW_FIELD_ALLOC_CHUNK 4 1105 #endif 1106 1107 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte, 1108 but this would require a corresponding change in unpack_field_as_long 1109 and friends. */ 1110 static int bits_per_byte = 8; 1111 1112 /* The routines that read and process dies for a C struct or C++ class 1113 pass lists of data member fields and lists of member function fields 1114 in an instance of a field_info structure, as defined below. */ 1115 struct field_info 1116 { 1117 /* List of data member and baseclasses fields. */ 1118 struct nextfield 1119 { 1120 struct nextfield *next; 1121 int accessibility; 1122 int virtuality; 1123 struct field field; 1124 } 1125 *fields, *baseclasses; 1126 1127 /* Number of fields (including baseclasses). */ 1128 int nfields; 1129 1130 /* Number of baseclasses. */ 1131 int nbaseclasses; 1132 1133 /* Set if the accesibility of one of the fields is not public. */ 1134 int non_public_fields; 1135 1136 /* Member function fields array, entries are allocated in the order they 1137 are encountered in the object file. */ 1138 struct nextfnfield 1139 { 1140 struct nextfnfield *next; 1141 struct fn_field fnfield; 1142 } 1143 *fnfields; 1144 1145 /* Member function fieldlist array, contains name of possibly overloaded 1146 member function, number of overloaded member functions and a pointer 1147 to the head of the member function field chain. */ 1148 struct fnfieldlist 1149 { 1150 const char *name; 1151 int length; 1152 struct nextfnfield *head; 1153 } 1154 *fnfieldlists; 1155 1156 /* Number of entries in the fnfieldlists array. */ 1157 int nfnfields; 1158 1159 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of 1160 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */ 1161 struct typedef_field_list 1162 { 1163 struct typedef_field field; 1164 struct typedef_field_list *next; 1165 } 1166 *typedef_field_list; 1167 unsigned typedef_field_list_count; 1168 }; 1169 1170 /* One item on the queue of compilation units to read in full symbols 1171 for. */ 1172 struct dwarf2_queue_item 1173 { 1174 struct dwarf2_per_cu_data *per_cu; 1175 enum language pretend_language; 1176 struct dwarf2_queue_item *next; 1177 }; 1178 1179 /* The current queue. */ 1180 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail; 1181 1182 /* Loaded secondary compilation units are kept in memory until they 1183 have not been referenced for the processing of this many 1184 compilation units. Set this to zero to disable caching. Cache 1185 sizes of up to at least twenty will improve startup time for 1186 typical inter-CU-reference binaries, at an obvious memory cost. */ 1187 static int dwarf2_max_cache_age = 5; 1188 static void 1189 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty, 1190 struct cmd_list_element *c, const char *value) 1191 { 1192 fprintf_filtered (file, _("The upper bound on the age of cached " 1193 "dwarf2 compilation units is %s.\n"), 1194 value); 1195 } 1196 1197 1198 /* Various complaints about symbol reading that don't abort the process. */ 1199 1200 static void 1201 dwarf2_statement_list_fits_in_line_number_section_complaint (void) 1202 { 1203 complaint (&symfile_complaints, 1204 _("statement list doesn't fit in .debug_line section")); 1205 } 1206 1207 static void 1208 dwarf2_debug_line_missing_file_complaint (void) 1209 { 1210 complaint (&symfile_complaints, 1211 _(".debug_line section has line data without a file")); 1212 } 1213 1214 static void 1215 dwarf2_debug_line_missing_end_sequence_complaint (void) 1216 { 1217 complaint (&symfile_complaints, 1218 _(".debug_line section has line " 1219 "program sequence without an end")); 1220 } 1221 1222 static void 1223 dwarf2_complex_location_expr_complaint (void) 1224 { 1225 complaint (&symfile_complaints, _("location expression too complex")); 1226 } 1227 1228 static void 1229 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2, 1230 int arg3) 1231 { 1232 complaint (&symfile_complaints, 1233 _("const value length mismatch for '%s', got %d, expected %d"), 1234 arg1, arg2, arg3); 1235 } 1236 1237 static void 1238 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section) 1239 { 1240 complaint (&symfile_complaints, 1241 _("debug info runs off end of %s section" 1242 " [in module %s]"), 1243 section->asection->name, 1244 bfd_get_filename (section->asection->owner)); 1245 } 1246 1247 static void 1248 dwarf2_macro_malformed_definition_complaint (const char *arg1) 1249 { 1250 complaint (&symfile_complaints, 1251 _("macro debug info contains a " 1252 "malformed macro definition:\n`%s'"), 1253 arg1); 1254 } 1255 1256 static void 1257 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2) 1258 { 1259 complaint (&symfile_complaints, 1260 _("invalid attribute class or form for '%s' in '%s'"), 1261 arg1, arg2); 1262 } 1263 1264 /* local function prototypes */ 1265 1266 static void dwarf2_locate_sections (bfd *, asection *, void *); 1267 1268 static void dwarf2_create_include_psymtab (char *, struct partial_symtab *, 1269 struct objfile *); 1270 1271 static void dwarf2_find_base_address (struct die_info *die, 1272 struct dwarf2_cu *cu); 1273 1274 static void dwarf2_build_psymtabs_hard (struct objfile *); 1275 1276 static void scan_partial_symbols (struct partial_die_info *, 1277 CORE_ADDR *, CORE_ADDR *, 1278 int, struct dwarf2_cu *); 1279 1280 static void add_partial_symbol (struct partial_die_info *, 1281 struct dwarf2_cu *); 1282 1283 static void add_partial_namespace (struct partial_die_info *pdi, 1284 CORE_ADDR *lowpc, CORE_ADDR *highpc, 1285 int need_pc, struct dwarf2_cu *cu); 1286 1287 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, 1288 CORE_ADDR *highpc, int need_pc, 1289 struct dwarf2_cu *cu); 1290 1291 static void add_partial_enumeration (struct partial_die_info *enum_pdi, 1292 struct dwarf2_cu *cu); 1293 1294 static void add_partial_subprogram (struct partial_die_info *pdi, 1295 CORE_ADDR *lowpc, CORE_ADDR *highpc, 1296 int need_pc, struct dwarf2_cu *cu); 1297 1298 static void dwarf2_read_symtab (struct partial_symtab *, 1299 struct objfile *); 1300 1301 static void psymtab_to_symtab_1 (struct partial_symtab *); 1302 1303 static struct abbrev_info *abbrev_table_lookup_abbrev 1304 (const struct abbrev_table *, unsigned int); 1305 1306 static struct abbrev_table *abbrev_table_read_table 1307 (struct dwarf2_section_info *, sect_offset); 1308 1309 static void abbrev_table_free (struct abbrev_table *); 1310 1311 static void abbrev_table_free_cleanup (void *); 1312 1313 static void dwarf2_read_abbrevs (struct dwarf2_cu *, 1314 struct dwarf2_section_info *); 1315 1316 static void dwarf2_free_abbrev_table (void *); 1317 1318 static unsigned int peek_abbrev_code (bfd *, gdb_byte *); 1319 1320 static struct partial_die_info *load_partial_dies 1321 (const struct die_reader_specs *, gdb_byte *, int); 1322 1323 static gdb_byte *read_partial_die (const struct die_reader_specs *, 1324 struct partial_die_info *, 1325 struct abbrev_info *, 1326 unsigned int, 1327 gdb_byte *); 1328 1329 static struct partial_die_info *find_partial_die (sect_offset, int, 1330 struct dwarf2_cu *); 1331 1332 static void fixup_partial_die (struct partial_die_info *, 1333 struct dwarf2_cu *); 1334 1335 static gdb_byte *read_attribute (const struct die_reader_specs *, 1336 struct attribute *, struct attr_abbrev *, 1337 gdb_byte *); 1338 1339 static unsigned int read_1_byte (bfd *, const gdb_byte *); 1340 1341 static int read_1_signed_byte (bfd *, const gdb_byte *); 1342 1343 static unsigned int read_2_bytes (bfd *, const gdb_byte *); 1344 1345 static unsigned int read_4_bytes (bfd *, const gdb_byte *); 1346 1347 static ULONGEST read_8_bytes (bfd *, const gdb_byte *); 1348 1349 static CORE_ADDR read_address (bfd *, gdb_byte *ptr, struct dwarf2_cu *, 1350 unsigned int *); 1351 1352 static LONGEST read_initial_length (bfd *, gdb_byte *, unsigned int *); 1353 1354 static LONGEST read_checked_initial_length_and_offset 1355 (bfd *, gdb_byte *, const struct comp_unit_head *, 1356 unsigned int *, unsigned int *); 1357 1358 static LONGEST read_offset (bfd *, gdb_byte *, const struct comp_unit_head *, 1359 unsigned int *); 1360 1361 static LONGEST read_offset_1 (bfd *, gdb_byte *, unsigned int); 1362 1363 static sect_offset read_abbrev_offset (struct dwarf2_section_info *, 1364 sect_offset); 1365 1366 static gdb_byte *read_n_bytes (bfd *, gdb_byte *, unsigned int); 1367 1368 static char *read_direct_string (bfd *, gdb_byte *, unsigned int *); 1369 1370 static char *read_indirect_string (bfd *, gdb_byte *, 1371 const struct comp_unit_head *, 1372 unsigned int *); 1373 1374 static char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST); 1375 1376 static ULONGEST read_unsigned_leb128 (bfd *, gdb_byte *, unsigned int *); 1377 1378 static LONGEST read_signed_leb128 (bfd *, gdb_byte *, unsigned int *); 1379 1380 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *, gdb_byte *, 1381 unsigned int *); 1382 1383 static char *read_str_index (const struct die_reader_specs *reader, 1384 struct dwarf2_cu *cu, ULONGEST str_index); 1385 1386 static void set_cu_language (unsigned int, struct dwarf2_cu *); 1387 1388 static struct attribute *dwarf2_attr (struct die_info *, unsigned int, 1389 struct dwarf2_cu *); 1390 1391 static struct attribute *dwarf2_attr_no_follow (struct die_info *, 1392 unsigned int); 1393 1394 static int dwarf2_flag_true_p (struct die_info *die, unsigned name, 1395 struct dwarf2_cu *cu); 1396 1397 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu); 1398 1399 static struct die_info *die_specification (struct die_info *die, 1400 struct dwarf2_cu **); 1401 1402 static void free_line_header (struct line_header *lh); 1403 1404 static void add_file_name (struct line_header *, char *, unsigned int, 1405 unsigned int, unsigned int); 1406 1407 static struct line_header *dwarf_decode_line_header (unsigned int offset, 1408 struct dwarf2_cu *cu); 1409 1410 static void dwarf_decode_lines (struct line_header *, const char *, 1411 struct dwarf2_cu *, struct partial_symtab *, 1412 int); 1413 1414 static void dwarf2_start_subfile (char *, const char *, const char *); 1415 1416 static void dwarf2_start_symtab (struct dwarf2_cu *, 1417 const char *, const char *, CORE_ADDR); 1418 1419 static struct symbol *new_symbol (struct die_info *, struct type *, 1420 struct dwarf2_cu *); 1421 1422 static struct symbol *new_symbol_full (struct die_info *, struct type *, 1423 struct dwarf2_cu *, struct symbol *); 1424 1425 static void dwarf2_const_value (struct attribute *, struct symbol *, 1426 struct dwarf2_cu *); 1427 1428 static void dwarf2_const_value_attr (struct attribute *attr, 1429 struct type *type, 1430 const char *name, 1431 struct obstack *obstack, 1432 struct dwarf2_cu *cu, LONGEST *value, 1433 gdb_byte **bytes, 1434 struct dwarf2_locexpr_baton **baton); 1435 1436 static struct type *die_type (struct die_info *, struct dwarf2_cu *); 1437 1438 static int need_gnat_info (struct dwarf2_cu *); 1439 1440 static struct type *die_descriptive_type (struct die_info *, 1441 struct dwarf2_cu *); 1442 1443 static void set_descriptive_type (struct type *, struct die_info *, 1444 struct dwarf2_cu *); 1445 1446 static struct type *die_containing_type (struct die_info *, 1447 struct dwarf2_cu *); 1448 1449 static struct type *lookup_die_type (struct die_info *, struct attribute *, 1450 struct dwarf2_cu *); 1451 1452 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *); 1453 1454 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *); 1455 1456 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *); 1457 1458 static char *typename_concat (struct obstack *obs, const char *prefix, 1459 const char *suffix, int physname, 1460 struct dwarf2_cu *cu); 1461 1462 static void read_file_scope (struct die_info *, struct dwarf2_cu *); 1463 1464 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *); 1465 1466 static void read_func_scope (struct die_info *, struct dwarf2_cu *); 1467 1468 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *); 1469 1470 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu); 1471 1472 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *, 1473 struct dwarf2_cu *, struct partial_symtab *); 1474 1475 static int dwarf2_get_pc_bounds (struct die_info *, 1476 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *, 1477 struct partial_symtab *); 1478 1479 static void get_scope_pc_bounds (struct die_info *, 1480 CORE_ADDR *, CORE_ADDR *, 1481 struct dwarf2_cu *); 1482 1483 static void dwarf2_record_block_ranges (struct die_info *, struct block *, 1484 CORE_ADDR, struct dwarf2_cu *); 1485 1486 static void dwarf2_add_field (struct field_info *, struct die_info *, 1487 struct dwarf2_cu *); 1488 1489 static void dwarf2_attach_fields_to_type (struct field_info *, 1490 struct type *, struct dwarf2_cu *); 1491 1492 static void dwarf2_add_member_fn (struct field_info *, 1493 struct die_info *, struct type *, 1494 struct dwarf2_cu *); 1495 1496 static void dwarf2_attach_fn_fields_to_type (struct field_info *, 1497 struct type *, 1498 struct dwarf2_cu *); 1499 1500 static void process_structure_scope (struct die_info *, struct dwarf2_cu *); 1501 1502 static void read_common_block (struct die_info *, struct dwarf2_cu *); 1503 1504 static void read_namespace (struct die_info *die, struct dwarf2_cu *); 1505 1506 static void read_module (struct die_info *die, struct dwarf2_cu *cu); 1507 1508 static void read_import_statement (struct die_info *die, struct dwarf2_cu *); 1509 1510 static struct type *read_module_type (struct die_info *die, 1511 struct dwarf2_cu *cu); 1512 1513 static const char *namespace_name (struct die_info *die, 1514 int *is_anonymous, struct dwarf2_cu *); 1515 1516 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *); 1517 1518 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *); 1519 1520 static enum dwarf_array_dim_ordering read_array_order (struct die_info *, 1521 struct dwarf2_cu *); 1522 1523 static struct die_info *read_die_and_children (const struct die_reader_specs *, 1524 gdb_byte *info_ptr, 1525 gdb_byte **new_info_ptr, 1526 struct die_info *parent); 1527 1528 static struct die_info *read_die_and_siblings (const struct die_reader_specs *, 1529 gdb_byte *info_ptr, 1530 gdb_byte **new_info_ptr, 1531 struct die_info *parent); 1532 1533 static gdb_byte *read_full_die_1 (const struct die_reader_specs *, 1534 struct die_info **, gdb_byte *, int *, int); 1535 1536 static gdb_byte *read_full_die (const struct die_reader_specs *, 1537 struct die_info **, gdb_byte *, int *); 1538 1539 static void process_die (struct die_info *, struct dwarf2_cu *); 1540 1541 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *, 1542 struct obstack *); 1543 1544 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *); 1545 1546 static const char *dwarf2_full_name (const char *name, 1547 struct die_info *die, 1548 struct dwarf2_cu *cu); 1549 1550 static struct die_info *dwarf2_extension (struct die_info *die, 1551 struct dwarf2_cu **); 1552 1553 static const char *dwarf_tag_name (unsigned int); 1554 1555 static const char *dwarf_attr_name (unsigned int); 1556 1557 static const char *dwarf_form_name (unsigned int); 1558 1559 static char *dwarf_bool_name (unsigned int); 1560 1561 static const char *dwarf_type_encoding_name (unsigned int); 1562 1563 static struct die_info *sibling_die (struct die_info *); 1564 1565 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *); 1566 1567 static void dump_die_for_error (struct die_info *); 1568 1569 static void dump_die_1 (struct ui_file *, int level, int max_level, 1570 struct die_info *); 1571 1572 /*static*/ void dump_die (struct die_info *, int max_level); 1573 1574 static void store_in_ref_table (struct die_info *, 1575 struct dwarf2_cu *); 1576 1577 static int is_ref_attr (struct attribute *); 1578 1579 static sect_offset dwarf2_get_ref_die_offset (struct attribute *); 1580 1581 static LONGEST dwarf2_get_attr_constant_value (struct attribute *, int); 1582 1583 static struct die_info *follow_die_ref_or_sig (struct die_info *, 1584 struct attribute *, 1585 struct dwarf2_cu **); 1586 1587 static struct die_info *follow_die_ref (struct die_info *, 1588 struct attribute *, 1589 struct dwarf2_cu **); 1590 1591 static struct die_info *follow_die_sig (struct die_info *, 1592 struct attribute *, 1593 struct dwarf2_cu **); 1594 1595 static struct signatured_type *lookup_signatured_type_at_offset 1596 (struct objfile *objfile, 1597 struct dwarf2_section_info *section, sect_offset offset); 1598 1599 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu); 1600 1601 static void read_signatured_type (struct signatured_type *); 1602 1603 static struct type_unit_group *get_type_unit_group 1604 (struct dwarf2_cu *, struct attribute *); 1605 1606 static void build_type_unit_groups (die_reader_func_ftype *, void *); 1607 1608 /* memory allocation interface */ 1609 1610 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *); 1611 1612 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int); 1613 1614 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, 1615 const char *, int); 1616 1617 static int attr_form_is_block (struct attribute *); 1618 1619 static int attr_form_is_section_offset (struct attribute *); 1620 1621 static int attr_form_is_constant (struct attribute *); 1622 1623 static void fill_in_loclist_baton (struct dwarf2_cu *cu, 1624 struct dwarf2_loclist_baton *baton, 1625 struct attribute *attr); 1626 1627 static void dwarf2_symbol_mark_computed (struct attribute *attr, 1628 struct symbol *sym, 1629 struct dwarf2_cu *cu); 1630 1631 static gdb_byte *skip_one_die (const struct die_reader_specs *reader, 1632 gdb_byte *info_ptr, 1633 struct abbrev_info *abbrev); 1634 1635 static void free_stack_comp_unit (void *); 1636 1637 static hashval_t partial_die_hash (const void *item); 1638 1639 static int partial_die_eq (const void *item_lhs, const void *item_rhs); 1640 1641 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit 1642 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile); 1643 1644 static void init_one_comp_unit (struct dwarf2_cu *cu, 1645 struct dwarf2_per_cu_data *per_cu); 1646 1647 static void prepare_one_comp_unit (struct dwarf2_cu *cu, 1648 struct die_info *comp_unit_die, 1649 enum language pretend_language); 1650 1651 static void free_heap_comp_unit (void *); 1652 1653 static void free_cached_comp_units (void *); 1654 1655 static void age_cached_comp_units (void); 1656 1657 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *); 1658 1659 static struct type *set_die_type (struct die_info *, struct type *, 1660 struct dwarf2_cu *); 1661 1662 static void create_all_comp_units (struct objfile *); 1663 1664 static int create_all_type_units (struct objfile *); 1665 1666 static void load_full_comp_unit (struct dwarf2_per_cu_data *, 1667 enum language); 1668 1669 static void process_full_comp_unit (struct dwarf2_per_cu_data *, 1670 enum language); 1671 1672 static void process_full_type_unit (struct dwarf2_per_cu_data *, 1673 enum language); 1674 1675 static void dwarf2_add_dependence (struct dwarf2_cu *, 1676 struct dwarf2_per_cu_data *); 1677 1678 static void dwarf2_mark (struct dwarf2_cu *); 1679 1680 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *); 1681 1682 static struct type *get_die_type_at_offset (sect_offset, 1683 struct dwarf2_per_cu_data *per_cu); 1684 1685 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu); 1686 1687 static void dwarf2_release_queue (void *dummy); 1688 1689 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu, 1690 enum language pretend_language); 1691 1692 static int maybe_queue_comp_unit (struct dwarf2_cu *this_cu, 1693 struct dwarf2_per_cu_data *per_cu, 1694 enum language pretend_language); 1695 1696 static void process_queue (void); 1697 1698 static void find_file_and_directory (struct die_info *die, 1699 struct dwarf2_cu *cu, 1700 const char **name, const char **comp_dir); 1701 1702 static char *file_full_name (int file, struct line_header *lh, 1703 const char *comp_dir); 1704 1705 static gdb_byte *read_and_check_comp_unit_head 1706 (struct comp_unit_head *header, 1707 struct dwarf2_section_info *section, 1708 struct dwarf2_section_info *abbrev_section, gdb_byte *info_ptr, 1709 int is_debug_types_section); 1710 1711 static void init_cutu_and_read_dies 1712 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table, 1713 int use_existing_cu, int keep, 1714 die_reader_func_ftype *die_reader_func, void *data); 1715 1716 static void init_cutu_and_read_dies_simple 1717 (struct dwarf2_per_cu_data *this_cu, 1718 die_reader_func_ftype *die_reader_func, void *data); 1719 1720 static htab_t allocate_signatured_type_table (struct objfile *objfile); 1721 1722 static htab_t allocate_dwo_unit_table (struct objfile *objfile); 1723 1724 static struct dwo_unit *lookup_dwo_comp_unit 1725 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST); 1726 1727 static struct dwo_unit *lookup_dwo_type_unit 1728 (struct signatured_type *, const char *, const char *); 1729 1730 static void free_dwo_file_cleanup (void *); 1731 1732 static void process_cu_includes (void); 1733 1734 static void check_producer (struct dwarf2_cu *cu); 1735 1736 #if WORDS_BIGENDIAN 1737 1738 /* Convert VALUE between big- and little-endian. */ 1739 static offset_type 1740 byte_swap (offset_type value) 1741 { 1742 offset_type result; 1743 1744 result = (value & 0xff) << 24; 1745 result |= (value & 0xff00) << 8; 1746 result |= (value & 0xff0000) >> 8; 1747 result |= (value & 0xff000000) >> 24; 1748 return result; 1749 } 1750 1751 #define MAYBE_SWAP(V) byte_swap (V) 1752 1753 #else 1754 #define MAYBE_SWAP(V) (V) 1755 #endif /* WORDS_BIGENDIAN */ 1756 1757 /* The suffix for an index file. */ 1758 #define INDEX_SUFFIX ".gdb-index" 1759 1760 static const char *dwarf2_physname (const char *name, struct die_info *die, 1761 struct dwarf2_cu *cu); 1762 1763 /* Try to locate the sections we need for DWARF 2 debugging 1764 information and return true if we have enough to do something. 1765 NAMES points to the dwarf2 section names, or is NULL if the standard 1766 ELF names are used. */ 1767 1768 int 1769 dwarf2_has_info (struct objfile *objfile, 1770 const struct dwarf2_debug_sections *names) 1771 { 1772 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key); 1773 if (!dwarf2_per_objfile) 1774 { 1775 /* Initialize per-objfile state. */ 1776 struct dwarf2_per_objfile *data 1777 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data)); 1778 1779 memset (data, 0, sizeof (*data)); 1780 set_objfile_data (objfile, dwarf2_objfile_data_key, data); 1781 dwarf2_per_objfile = data; 1782 1783 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections, 1784 (void *) names); 1785 dwarf2_per_objfile->objfile = objfile; 1786 } 1787 return (dwarf2_per_objfile->info.asection != NULL 1788 && dwarf2_per_objfile->abbrev.asection != NULL); 1789 } 1790 1791 /* When loading sections, we look either for uncompressed section or for 1792 compressed section names. */ 1793 1794 static int 1795 section_is_p (const char *section_name, 1796 const struct dwarf2_section_names *names) 1797 { 1798 if (names->normal != NULL 1799 && strcmp (section_name, names->normal) == 0) 1800 return 1; 1801 if (names->compressed != NULL 1802 && strcmp (section_name, names->compressed) == 0) 1803 return 1; 1804 return 0; 1805 } 1806 1807 /* This function is mapped across the sections and remembers the 1808 offset and size of each of the debugging sections we are interested 1809 in. */ 1810 1811 static void 1812 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames) 1813 { 1814 const struct dwarf2_debug_sections *names; 1815 flagword aflag = bfd_get_section_flags (abfd, sectp); 1816 1817 if (vnames == NULL) 1818 names = &dwarf2_elf_names; 1819 else 1820 names = (const struct dwarf2_debug_sections *) vnames; 1821 1822 if ((aflag & SEC_HAS_CONTENTS) == 0) 1823 { 1824 } 1825 else if (section_is_p (sectp->name, &names->info)) 1826 { 1827 dwarf2_per_objfile->info.asection = sectp; 1828 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp); 1829 } 1830 else if (section_is_p (sectp->name, &names->abbrev)) 1831 { 1832 dwarf2_per_objfile->abbrev.asection = sectp; 1833 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp); 1834 } 1835 else if (section_is_p (sectp->name, &names->line)) 1836 { 1837 dwarf2_per_objfile->line.asection = sectp; 1838 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp); 1839 } 1840 else if (section_is_p (sectp->name, &names->loc)) 1841 { 1842 dwarf2_per_objfile->loc.asection = sectp; 1843 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp); 1844 } 1845 else if (section_is_p (sectp->name, &names->macinfo)) 1846 { 1847 dwarf2_per_objfile->macinfo.asection = sectp; 1848 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp); 1849 } 1850 else if (section_is_p (sectp->name, &names->macro)) 1851 { 1852 dwarf2_per_objfile->macro.asection = sectp; 1853 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp); 1854 } 1855 else if (section_is_p (sectp->name, &names->str)) 1856 { 1857 dwarf2_per_objfile->str.asection = sectp; 1858 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp); 1859 } 1860 else if (section_is_p (sectp->name, &names->addr)) 1861 { 1862 dwarf2_per_objfile->addr.asection = sectp; 1863 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp); 1864 } 1865 else if (section_is_p (sectp->name, &names->frame)) 1866 { 1867 dwarf2_per_objfile->frame.asection = sectp; 1868 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp); 1869 } 1870 else if (section_is_p (sectp->name, &names->eh_frame)) 1871 { 1872 dwarf2_per_objfile->eh_frame.asection = sectp; 1873 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp); 1874 } 1875 else if (section_is_p (sectp->name, &names->ranges)) 1876 { 1877 dwarf2_per_objfile->ranges.asection = sectp; 1878 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp); 1879 } 1880 else if (section_is_p (sectp->name, &names->types)) 1881 { 1882 struct dwarf2_section_info type_section; 1883 1884 memset (&type_section, 0, sizeof (type_section)); 1885 type_section.asection = sectp; 1886 type_section.size = bfd_get_section_size (sectp); 1887 1888 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types, 1889 &type_section); 1890 } 1891 else if (section_is_p (sectp->name, &names->gdb_index)) 1892 { 1893 dwarf2_per_objfile->gdb_index.asection = sectp; 1894 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp); 1895 } 1896 1897 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD) 1898 && bfd_section_vma (abfd, sectp) == 0) 1899 dwarf2_per_objfile->has_section_at_zero = 1; 1900 } 1901 1902 /* A helper function that decides whether a section is empty, 1903 or not present. */ 1904 1905 static int 1906 dwarf2_section_empty_p (struct dwarf2_section_info *info) 1907 { 1908 return info->asection == NULL || info->size == 0; 1909 } 1910 1911 /* Read the contents of the section INFO. 1912 OBJFILE is the main object file, but not necessarily the file where 1913 the section comes from. E.g., for DWO files INFO->asection->owner 1914 is the bfd of the DWO file. 1915 If the section is compressed, uncompress it before returning. */ 1916 1917 static void 1918 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info) 1919 { 1920 asection *sectp = info->asection; 1921 bfd *abfd; 1922 gdb_byte *buf, *retbuf; 1923 unsigned char header[4]; 1924 1925 if (info->readin) 1926 return; 1927 info->buffer = NULL; 1928 info->readin = 1; 1929 1930 if (dwarf2_section_empty_p (info)) 1931 return; 1932 1933 abfd = sectp->owner; 1934 1935 /* If the section has relocations, we must read it ourselves. 1936 Otherwise we attach it to the BFD. */ 1937 if ((sectp->flags & SEC_RELOC) == 0) 1938 { 1939 const gdb_byte *bytes = gdb_bfd_map_section (sectp, &info->size); 1940 1941 /* We have to cast away const here for historical reasons. 1942 Fixing dwarf2read to be const-correct would be quite nice. */ 1943 info->buffer = (gdb_byte *) bytes; 1944 return; 1945 } 1946 1947 buf = obstack_alloc (&objfile->objfile_obstack, info->size); 1948 info->buffer = buf; 1949 1950 /* When debugging .o files, we may need to apply relocations; see 1951 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html . 1952 We never compress sections in .o files, so we only need to 1953 try this when the section is not compressed. */ 1954 retbuf = symfile_relocate_debug_section (objfile, sectp, buf); 1955 if (retbuf != NULL) 1956 { 1957 info->buffer = retbuf; 1958 return; 1959 } 1960 1961 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0 1962 || bfd_bread (buf, info->size, abfd) != info->size) 1963 error (_("Dwarf Error: Can't read DWARF data from '%s'"), 1964 bfd_get_filename (abfd)); 1965 } 1966 1967 /* A helper function that returns the size of a section in a safe way. 1968 If you are positive that the section has been read before using the 1969 size, then it is safe to refer to the dwarf2_section_info object's 1970 "size" field directly. In other cases, you must call this 1971 function, because for compressed sections the size field is not set 1972 correctly until the section has been read. */ 1973 1974 static bfd_size_type 1975 dwarf2_section_size (struct objfile *objfile, 1976 struct dwarf2_section_info *info) 1977 { 1978 if (!info->readin) 1979 dwarf2_read_section (objfile, info); 1980 return info->size; 1981 } 1982 1983 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and 1984 SECTION_NAME. */ 1985 1986 void 1987 dwarf2_get_section_info (struct objfile *objfile, 1988 enum dwarf2_section_enum sect, 1989 asection **sectp, gdb_byte **bufp, 1990 bfd_size_type *sizep) 1991 { 1992 struct dwarf2_per_objfile *data 1993 = objfile_data (objfile, dwarf2_objfile_data_key); 1994 struct dwarf2_section_info *info; 1995 1996 /* We may see an objfile without any DWARF, in which case we just 1997 return nothing. */ 1998 if (data == NULL) 1999 { 2000 *sectp = NULL; 2001 *bufp = NULL; 2002 *sizep = 0; 2003 return; 2004 } 2005 switch (sect) 2006 { 2007 case DWARF2_DEBUG_FRAME: 2008 info = &data->frame; 2009 break; 2010 case DWARF2_EH_FRAME: 2011 info = &data->eh_frame; 2012 break; 2013 default: 2014 gdb_assert_not_reached ("unexpected section"); 2015 } 2016 2017 dwarf2_read_section (objfile, info); 2018 2019 *sectp = info->asection; 2020 *bufp = info->buffer; 2021 *sizep = info->size; 2022 } 2023 2024 /* A helper function to find the sections for a .dwz file. */ 2025 2026 static void 2027 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg) 2028 { 2029 struct dwz_file *dwz_file = arg; 2030 2031 /* Note that we only support the standard ELF names, because .dwz 2032 is ELF-only (at the time of writing). */ 2033 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev)) 2034 { 2035 dwz_file->abbrev.asection = sectp; 2036 dwz_file->abbrev.size = bfd_get_section_size (sectp); 2037 } 2038 else if (section_is_p (sectp->name, &dwarf2_elf_names.info)) 2039 { 2040 dwz_file->info.asection = sectp; 2041 dwz_file->info.size = bfd_get_section_size (sectp); 2042 } 2043 else if (section_is_p (sectp->name, &dwarf2_elf_names.str)) 2044 { 2045 dwz_file->str.asection = sectp; 2046 dwz_file->str.size = bfd_get_section_size (sectp); 2047 } 2048 else if (section_is_p (sectp->name, &dwarf2_elf_names.line)) 2049 { 2050 dwz_file->line.asection = sectp; 2051 dwz_file->line.size = bfd_get_section_size (sectp); 2052 } 2053 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro)) 2054 { 2055 dwz_file->macro.asection = sectp; 2056 dwz_file->macro.size = bfd_get_section_size (sectp); 2057 } 2058 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index)) 2059 { 2060 dwz_file->gdb_index.asection = sectp; 2061 dwz_file->gdb_index.size = bfd_get_section_size (sectp); 2062 } 2063 } 2064 2065 /* Open the separate '.dwz' debug file, if needed. Error if the file 2066 cannot be found. */ 2067 2068 static struct dwz_file * 2069 dwarf2_get_dwz_file (void) 2070 { 2071 bfd *abfd, *dwz_bfd; 2072 asection *section; 2073 gdb_byte *data; 2074 struct cleanup *cleanup; 2075 const char *filename; 2076 struct dwz_file *result; 2077 2078 if (dwarf2_per_objfile->dwz_file != NULL) 2079 return dwarf2_per_objfile->dwz_file; 2080 2081 abfd = dwarf2_per_objfile->objfile->obfd; 2082 section = bfd_get_section_by_name (abfd, ".gnu_debugaltlink"); 2083 if (section == NULL) 2084 error (_("could not find '.gnu_debugaltlink' section")); 2085 if (!bfd_malloc_and_get_section (abfd, section, &data)) 2086 error (_("could not read '.gnu_debugaltlink' section: %s"), 2087 bfd_errmsg (bfd_get_error ())); 2088 cleanup = make_cleanup (xfree, data); 2089 2090 filename = data; 2091 if (!IS_ABSOLUTE_PATH (filename)) 2092 { 2093 char *abs = gdb_realpath (dwarf2_per_objfile->objfile->name); 2094 char *rel; 2095 2096 make_cleanup (xfree, abs); 2097 abs = ldirname (abs); 2098 make_cleanup (xfree, abs); 2099 2100 rel = concat (abs, SLASH_STRING, filename, (char *) NULL); 2101 make_cleanup (xfree, rel); 2102 filename = rel; 2103 } 2104 2105 /* The format is just a NUL-terminated file name, followed by the 2106 build-id. For now, though, we ignore the build-id. */ 2107 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1); 2108 if (dwz_bfd == NULL) 2109 error (_("could not read '%s': %s"), filename, 2110 bfd_errmsg (bfd_get_error ())); 2111 2112 if (!bfd_check_format (dwz_bfd, bfd_object)) 2113 { 2114 gdb_bfd_unref (dwz_bfd); 2115 error (_("file '%s' was not usable: %s"), filename, 2116 bfd_errmsg (bfd_get_error ())); 2117 } 2118 2119 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack, 2120 struct dwz_file); 2121 result->dwz_bfd = dwz_bfd; 2122 2123 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result); 2124 2125 do_cleanups (cleanup); 2126 2127 dwarf2_per_objfile->dwz_file = result; 2128 return result; 2129 } 2130 2131 /* DWARF quick_symbols_functions support. */ 2132 2133 /* TUs can share .debug_line entries, and there can be a lot more TUs than 2134 unique line tables, so we maintain a separate table of all .debug_line 2135 derived entries to support the sharing. 2136 All the quick functions need is the list of file names. We discard the 2137 line_header when we're done and don't need to record it here. */ 2138 struct quick_file_names 2139 { 2140 /* The data used to construct the hash key. */ 2141 struct stmt_list_hash hash; 2142 2143 /* The number of entries in file_names, real_names. */ 2144 unsigned int num_file_names; 2145 2146 /* The file names from the line table, after being run through 2147 file_full_name. */ 2148 const char **file_names; 2149 2150 /* The file names from the line table after being run through 2151 gdb_realpath. These are computed lazily. */ 2152 const char **real_names; 2153 }; 2154 2155 /* When using the index (and thus not using psymtabs), each CU has an 2156 object of this type. This is used to hold information needed by 2157 the various "quick" methods. */ 2158 struct dwarf2_per_cu_quick_data 2159 { 2160 /* The file table. This can be NULL if there was no file table 2161 or it's currently not read in. 2162 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */ 2163 struct quick_file_names *file_names; 2164 2165 /* The corresponding symbol table. This is NULL if symbols for this 2166 CU have not yet been read. */ 2167 struct symtab *symtab; 2168 2169 /* A temporary mark bit used when iterating over all CUs in 2170 expand_symtabs_matching. */ 2171 unsigned int mark : 1; 2172 2173 /* True if we've tried to read the file table and found there isn't one. 2174 There will be no point in trying to read it again next time. */ 2175 unsigned int no_file_data : 1; 2176 }; 2177 2178 /* Utility hash function for a stmt_list_hash. */ 2179 2180 static hashval_t 2181 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash) 2182 { 2183 hashval_t v = 0; 2184 2185 if (stmt_list_hash->dwo_unit != NULL) 2186 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file; 2187 v += stmt_list_hash->line_offset.sect_off; 2188 return v; 2189 } 2190 2191 /* Utility equality function for a stmt_list_hash. */ 2192 2193 static int 2194 eq_stmt_list_entry (const struct stmt_list_hash *lhs, 2195 const struct stmt_list_hash *rhs) 2196 { 2197 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL)) 2198 return 0; 2199 if (lhs->dwo_unit != NULL 2200 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file) 2201 return 0; 2202 2203 return lhs->line_offset.sect_off == rhs->line_offset.sect_off; 2204 } 2205 2206 /* Hash function for a quick_file_names. */ 2207 2208 static hashval_t 2209 hash_file_name_entry (const void *e) 2210 { 2211 const struct quick_file_names *file_data = e; 2212 2213 return hash_stmt_list_entry (&file_data->hash); 2214 } 2215 2216 /* Equality function for a quick_file_names. */ 2217 2218 static int 2219 eq_file_name_entry (const void *a, const void *b) 2220 { 2221 const struct quick_file_names *ea = a; 2222 const struct quick_file_names *eb = b; 2223 2224 return eq_stmt_list_entry (&ea->hash, &eb->hash); 2225 } 2226 2227 /* Delete function for a quick_file_names. */ 2228 2229 static void 2230 delete_file_name_entry (void *e) 2231 { 2232 struct quick_file_names *file_data = e; 2233 int i; 2234 2235 for (i = 0; i < file_data->num_file_names; ++i) 2236 { 2237 xfree ((void*) file_data->file_names[i]); 2238 if (file_data->real_names) 2239 xfree ((void*) file_data->real_names[i]); 2240 } 2241 2242 /* The space for the struct itself lives on objfile_obstack, 2243 so we don't free it here. */ 2244 } 2245 2246 /* Create a quick_file_names hash table. */ 2247 2248 static htab_t 2249 create_quick_file_names_table (unsigned int nr_initial_entries) 2250 { 2251 return htab_create_alloc (nr_initial_entries, 2252 hash_file_name_entry, eq_file_name_entry, 2253 delete_file_name_entry, xcalloc, xfree); 2254 } 2255 2256 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would 2257 have to be created afterwards. You should call age_cached_comp_units after 2258 processing PER_CU->CU. dw2_setup must have been already called. */ 2259 2260 static void 2261 load_cu (struct dwarf2_per_cu_data *per_cu) 2262 { 2263 if (per_cu->is_debug_types) 2264 load_full_type_unit (per_cu); 2265 else 2266 load_full_comp_unit (per_cu, language_minimal); 2267 2268 gdb_assert (per_cu->cu != NULL); 2269 2270 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu); 2271 } 2272 2273 /* Read in the symbols for PER_CU. */ 2274 2275 static void 2276 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu) 2277 { 2278 struct cleanup *back_to; 2279 2280 /* Skip type_unit_groups, reading the type units they contain 2281 is handled elsewhere. */ 2282 if (IS_TYPE_UNIT_GROUP (per_cu)) 2283 return; 2284 2285 back_to = make_cleanup (dwarf2_release_queue, NULL); 2286 2287 if (dwarf2_per_objfile->using_index 2288 ? per_cu->v.quick->symtab == NULL 2289 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin)) 2290 { 2291 queue_comp_unit (per_cu, language_minimal); 2292 load_cu (per_cu); 2293 } 2294 2295 process_queue (); 2296 2297 /* Age the cache, releasing compilation units that have not 2298 been used recently. */ 2299 age_cached_comp_units (); 2300 2301 do_cleanups (back_to); 2302 } 2303 2304 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is 2305 the objfile from which this CU came. Returns the resulting symbol 2306 table. */ 2307 2308 static struct symtab * 2309 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu) 2310 { 2311 gdb_assert (dwarf2_per_objfile->using_index); 2312 if (!per_cu->v.quick->symtab) 2313 { 2314 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL); 2315 increment_reading_symtab (); 2316 dw2_do_instantiate_symtab (per_cu); 2317 process_cu_includes (); 2318 do_cleanups (back_to); 2319 } 2320 return per_cu->v.quick->symtab; 2321 } 2322 2323 /* Return the CU given its index. 2324 2325 This is intended for loops like: 2326 2327 for (i = 0; i < (dwarf2_per_objfile->n_comp_units 2328 + dwarf2_per_objfile->n_type_units); ++i) 2329 { 2330 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); 2331 2332 ...; 2333 } 2334 */ 2335 2336 static struct dwarf2_per_cu_data * 2337 dw2_get_cu (int index) 2338 { 2339 if (index >= dwarf2_per_objfile->n_comp_units) 2340 { 2341 index -= dwarf2_per_objfile->n_comp_units; 2342 gdb_assert (index < dwarf2_per_objfile->n_type_units); 2343 return &dwarf2_per_objfile->all_type_units[index]->per_cu; 2344 } 2345 2346 return dwarf2_per_objfile->all_comp_units[index]; 2347 } 2348 2349 /* Return the primary CU given its index. 2350 The difference between this function and dw2_get_cu is in the handling 2351 of type units (TUs). Here we return the type_unit_group object. 2352 2353 This is intended for loops like: 2354 2355 for (i = 0; i < (dwarf2_per_objfile->n_comp_units 2356 + dwarf2_per_objfile->n_type_unit_groups); ++i) 2357 { 2358 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i); 2359 2360 ...; 2361 } 2362 */ 2363 2364 static struct dwarf2_per_cu_data * 2365 dw2_get_primary_cu (int index) 2366 { 2367 if (index >= dwarf2_per_objfile->n_comp_units) 2368 { 2369 index -= dwarf2_per_objfile->n_comp_units; 2370 gdb_assert (index < dwarf2_per_objfile->n_type_unit_groups); 2371 return &dwarf2_per_objfile->all_type_unit_groups[index]->per_cu; 2372 } 2373 2374 return dwarf2_per_objfile->all_comp_units[index]; 2375 } 2376 2377 /* A helper for create_cus_from_index that handles a given list of 2378 CUs. */ 2379 2380 static void 2381 create_cus_from_index_list (struct objfile *objfile, 2382 const gdb_byte *cu_list, offset_type n_elements, 2383 struct dwarf2_section_info *section, 2384 int is_dwz, 2385 int base_offset) 2386 { 2387 offset_type i; 2388 2389 for (i = 0; i < n_elements; i += 2) 2390 { 2391 struct dwarf2_per_cu_data *the_cu; 2392 ULONGEST offset, length; 2393 2394 gdb_static_assert (sizeof (ULONGEST) >= 8); 2395 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE); 2396 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE); 2397 cu_list += 2 * 8; 2398 2399 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack, 2400 struct dwarf2_per_cu_data); 2401 the_cu->offset.sect_off = offset; 2402 the_cu->length = length; 2403 the_cu->objfile = objfile; 2404 the_cu->info_or_types_section = section; 2405 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack, 2406 struct dwarf2_per_cu_quick_data); 2407 the_cu->is_dwz = is_dwz; 2408 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu; 2409 } 2410 } 2411 2412 /* Read the CU list from the mapped index, and use it to create all 2413 the CU objects for this objfile. */ 2414 2415 static void 2416 create_cus_from_index (struct objfile *objfile, 2417 const gdb_byte *cu_list, offset_type cu_list_elements, 2418 const gdb_byte *dwz_list, offset_type dwz_elements) 2419 { 2420 struct dwz_file *dwz; 2421 2422 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2; 2423 dwarf2_per_objfile->all_comp_units 2424 = obstack_alloc (&objfile->objfile_obstack, 2425 dwarf2_per_objfile->n_comp_units 2426 * sizeof (struct dwarf2_per_cu_data *)); 2427 2428 create_cus_from_index_list (objfile, cu_list, cu_list_elements, 2429 &dwarf2_per_objfile->info, 0, 0); 2430 2431 if (dwz_elements == 0) 2432 return; 2433 2434 dwz = dwarf2_get_dwz_file (); 2435 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1, 2436 cu_list_elements / 2); 2437 } 2438 2439 /* Create the signatured type hash table from the index. */ 2440 2441 static void 2442 create_signatured_type_table_from_index (struct objfile *objfile, 2443 struct dwarf2_section_info *section, 2444 const gdb_byte *bytes, 2445 offset_type elements) 2446 { 2447 offset_type i; 2448 htab_t sig_types_hash; 2449 2450 dwarf2_per_objfile->n_type_units = elements / 3; 2451 dwarf2_per_objfile->all_type_units 2452 = obstack_alloc (&objfile->objfile_obstack, 2453 dwarf2_per_objfile->n_type_units 2454 * sizeof (struct signatured_type *)); 2455 2456 sig_types_hash = allocate_signatured_type_table (objfile); 2457 2458 for (i = 0; i < elements; i += 3) 2459 { 2460 struct signatured_type *sig_type; 2461 ULONGEST offset, type_offset_in_tu, signature; 2462 void **slot; 2463 2464 gdb_static_assert (sizeof (ULONGEST) >= 8); 2465 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE); 2466 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8, 2467 BFD_ENDIAN_LITTLE); 2468 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE); 2469 bytes += 3 * 8; 2470 2471 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack, 2472 struct signatured_type); 2473 sig_type->signature = signature; 2474 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu; 2475 sig_type->per_cu.is_debug_types = 1; 2476 sig_type->per_cu.info_or_types_section = section; 2477 sig_type->per_cu.offset.sect_off = offset; 2478 sig_type->per_cu.objfile = objfile; 2479 sig_type->per_cu.v.quick 2480 = OBSTACK_ZALLOC (&objfile->objfile_obstack, 2481 struct dwarf2_per_cu_quick_data); 2482 2483 slot = htab_find_slot (sig_types_hash, sig_type, INSERT); 2484 *slot = sig_type; 2485 2486 dwarf2_per_objfile->all_type_units[i / 3] = sig_type; 2487 } 2488 2489 dwarf2_per_objfile->signatured_types = sig_types_hash; 2490 } 2491 2492 /* Read the address map data from the mapped index, and use it to 2493 populate the objfile's psymtabs_addrmap. */ 2494 2495 static void 2496 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index) 2497 { 2498 const gdb_byte *iter, *end; 2499 struct obstack temp_obstack; 2500 struct addrmap *mutable_map; 2501 struct cleanup *cleanup; 2502 CORE_ADDR baseaddr; 2503 2504 obstack_init (&temp_obstack); 2505 cleanup = make_cleanup_obstack_free (&temp_obstack); 2506 mutable_map = addrmap_create_mutable (&temp_obstack); 2507 2508 iter = index->address_table; 2509 end = iter + index->address_table_size; 2510 2511 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 2512 2513 while (iter < end) 2514 { 2515 ULONGEST hi, lo, cu_index; 2516 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE); 2517 iter += 8; 2518 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE); 2519 iter += 8; 2520 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE); 2521 iter += 4; 2522 2523 addrmap_set_empty (mutable_map, lo + baseaddr, hi + baseaddr - 1, 2524 dw2_get_cu (cu_index)); 2525 } 2526 2527 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map, 2528 &objfile->objfile_obstack); 2529 do_cleanups (cleanup); 2530 } 2531 2532 /* The hash function for strings in the mapped index. This is the same as 2533 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the 2534 implementation. This is necessary because the hash function is tied to the 2535 format of the mapped index file. The hash values do not have to match with 2536 SYMBOL_HASH_NEXT. 2537 2538 Use INT_MAX for INDEX_VERSION if you generate the current index format. */ 2539 2540 static hashval_t 2541 mapped_index_string_hash (int index_version, const void *p) 2542 { 2543 const unsigned char *str = (const unsigned char *) p; 2544 hashval_t r = 0; 2545 unsigned char c; 2546 2547 while ((c = *str++) != 0) 2548 { 2549 if (index_version >= 5) 2550 c = tolower (c); 2551 r = r * 67 + c - 113; 2552 } 2553 2554 return r; 2555 } 2556 2557 /* Find a slot in the mapped index INDEX for the object named NAME. 2558 If NAME is found, set *VEC_OUT to point to the CU vector in the 2559 constant pool and return 1. If NAME cannot be found, return 0. */ 2560 2561 static int 2562 find_slot_in_mapped_hash (struct mapped_index *index, const char *name, 2563 offset_type **vec_out) 2564 { 2565 struct cleanup *back_to = make_cleanup (null_cleanup, 0); 2566 offset_type hash; 2567 offset_type slot, step; 2568 int (*cmp) (const char *, const char *); 2569 2570 if (current_language->la_language == language_cplus 2571 || current_language->la_language == language_java 2572 || current_language->la_language == language_fortran) 2573 { 2574 /* NAME is already canonical. Drop any qualifiers as .gdb_index does 2575 not contain any. */ 2576 const char *paren = strchr (name, '('); 2577 2578 if (paren) 2579 { 2580 char *dup; 2581 2582 dup = xmalloc (paren - name + 1); 2583 memcpy (dup, name, paren - name); 2584 dup[paren - name] = 0; 2585 2586 make_cleanup (xfree, dup); 2587 name = dup; 2588 } 2589 } 2590 2591 /* Index version 4 did not support case insensitive searches. But the 2592 indices for case insensitive languages are built in lowercase, therefore 2593 simulate our NAME being searched is also lowercased. */ 2594 hash = mapped_index_string_hash ((index->version == 4 2595 && case_sensitivity == case_sensitive_off 2596 ? 5 : index->version), 2597 name); 2598 2599 slot = hash & (index->symbol_table_slots - 1); 2600 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1; 2601 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp); 2602 2603 for (;;) 2604 { 2605 /* Convert a slot number to an offset into the table. */ 2606 offset_type i = 2 * slot; 2607 const char *str; 2608 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0) 2609 { 2610 do_cleanups (back_to); 2611 return 0; 2612 } 2613 2614 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]); 2615 if (!cmp (name, str)) 2616 { 2617 *vec_out = (offset_type *) (index->constant_pool 2618 + MAYBE_SWAP (index->symbol_table[i + 1])); 2619 do_cleanups (back_to); 2620 return 1; 2621 } 2622 2623 slot = (slot + step) & (index->symbol_table_slots - 1); 2624 } 2625 } 2626 2627 /* A helper function that reads the .gdb_index from SECTION and fills 2628 in MAP. FILENAME is the name of the file containing the section; 2629 it is used for error reporting. DEPRECATED_OK is nonzero if it is 2630 ok to use deprecated sections. 2631 2632 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are 2633 out parameters that are filled in with information about the CU and 2634 TU lists in the section. 2635 2636 Returns 1 if all went well, 0 otherwise. */ 2637 2638 static int 2639 read_index_from_section (struct objfile *objfile, 2640 const char *filename, 2641 int deprecated_ok, 2642 struct dwarf2_section_info *section, 2643 struct mapped_index *map, 2644 const gdb_byte **cu_list, 2645 offset_type *cu_list_elements, 2646 const gdb_byte **types_list, 2647 offset_type *types_list_elements) 2648 { 2649 char *addr; 2650 offset_type version; 2651 offset_type *metadata; 2652 int i; 2653 2654 if (dwarf2_section_empty_p (section)) 2655 return 0; 2656 2657 /* Older elfutils strip versions could keep the section in the main 2658 executable while splitting it for the separate debug info file. */ 2659 if ((bfd_get_file_flags (section->asection) & SEC_HAS_CONTENTS) == 0) 2660 return 0; 2661 2662 dwarf2_read_section (objfile, section); 2663 2664 addr = section->buffer; 2665 /* Version check. */ 2666 version = MAYBE_SWAP (*(offset_type *) addr); 2667 /* Versions earlier than 3 emitted every copy of a psymbol. This 2668 causes the index to behave very poorly for certain requests. Version 3 2669 contained incomplete addrmap. So, it seems better to just ignore such 2670 indices. */ 2671 if (version < 4) 2672 { 2673 static int warning_printed = 0; 2674 if (!warning_printed) 2675 { 2676 warning (_("Skipping obsolete .gdb_index section in %s."), 2677 filename); 2678 warning_printed = 1; 2679 } 2680 return 0; 2681 } 2682 /* Index version 4 uses a different hash function than index version 2683 5 and later. 2684 2685 Versions earlier than 6 did not emit psymbols for inlined 2686 functions. Using these files will cause GDB not to be able to 2687 set breakpoints on inlined functions by name, so we ignore these 2688 indices unless the user has done 2689 "set use-deprecated-index-sections on". */ 2690 if (version < 6 && !deprecated_ok) 2691 { 2692 static int warning_printed = 0; 2693 if (!warning_printed) 2694 { 2695 warning (_("\ 2696 Skipping deprecated .gdb_index section in %s.\n\ 2697 Do \"set use-deprecated-index-sections on\" before the file is read\n\ 2698 to use the section anyway."), 2699 filename); 2700 warning_printed = 1; 2701 } 2702 return 0; 2703 } 2704 /* Version 7 indices generated by gold refer to the CU for a symbol instead 2705 of the TU (for symbols coming from TUs). It's just a performance bug, and 2706 we can't distinguish gdb-generated indices from gold-generated ones, so 2707 nothing to do here. */ 2708 2709 /* Indexes with higher version than the one supported by GDB may be no 2710 longer backward compatible. */ 2711 if (version > 8) 2712 return 0; 2713 2714 map->version = version; 2715 map->total_size = section->size; 2716 2717 metadata = (offset_type *) (addr + sizeof (offset_type)); 2718 2719 i = 0; 2720 *cu_list = addr + MAYBE_SWAP (metadata[i]); 2721 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i])) 2722 / 8); 2723 ++i; 2724 2725 *types_list = addr + MAYBE_SWAP (metadata[i]); 2726 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1]) 2727 - MAYBE_SWAP (metadata[i])) 2728 / 8); 2729 ++i; 2730 2731 map->address_table = addr + MAYBE_SWAP (metadata[i]); 2732 map->address_table_size = (MAYBE_SWAP (metadata[i + 1]) 2733 - MAYBE_SWAP (metadata[i])); 2734 ++i; 2735 2736 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i])); 2737 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1]) 2738 - MAYBE_SWAP (metadata[i])) 2739 / (2 * sizeof (offset_type))); 2740 ++i; 2741 2742 map->constant_pool = addr + MAYBE_SWAP (metadata[i]); 2743 2744 return 1; 2745 } 2746 2747 2748 /* Read the index file. If everything went ok, initialize the "quick" 2749 elements of all the CUs and return 1. Otherwise, return 0. */ 2750 2751 static int 2752 dwarf2_read_index (struct objfile *objfile) 2753 { 2754 struct mapped_index local_map, *map; 2755 const gdb_byte *cu_list, *types_list, *dwz_list = NULL; 2756 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0; 2757 2758 if (!read_index_from_section (objfile, objfile->name, 2759 use_deprecated_index_sections, 2760 &dwarf2_per_objfile->gdb_index, &local_map, 2761 &cu_list, &cu_list_elements, 2762 &types_list, &types_list_elements)) 2763 return 0; 2764 2765 /* Don't use the index if it's empty. */ 2766 if (local_map.symbol_table_slots == 0) 2767 return 0; 2768 2769 /* If there is a .dwz file, read it so we can get its CU list as 2770 well. */ 2771 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL) 2772 { 2773 struct dwz_file *dwz = dwarf2_get_dwz_file (); 2774 struct mapped_index dwz_map; 2775 const gdb_byte *dwz_types_ignore; 2776 offset_type dwz_types_elements_ignore; 2777 2778 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd), 2779 1, 2780 &dwz->gdb_index, &dwz_map, 2781 &dwz_list, &dwz_list_elements, 2782 &dwz_types_ignore, 2783 &dwz_types_elements_ignore)) 2784 { 2785 warning (_("could not read '.gdb_index' section from %s; skipping"), 2786 bfd_get_filename (dwz->dwz_bfd)); 2787 return 0; 2788 } 2789 } 2790 2791 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list, 2792 dwz_list_elements); 2793 2794 if (types_list_elements) 2795 { 2796 struct dwarf2_section_info *section; 2797 2798 /* We can only handle a single .debug_types when we have an 2799 index. */ 2800 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1) 2801 return 0; 2802 2803 section = VEC_index (dwarf2_section_info_def, 2804 dwarf2_per_objfile->types, 0); 2805 2806 create_signatured_type_table_from_index (objfile, section, types_list, 2807 types_list_elements); 2808 } 2809 2810 create_addrmap_from_index (objfile, &local_map); 2811 2812 map = obstack_alloc (&objfile->objfile_obstack, sizeof (struct mapped_index)); 2813 *map = local_map; 2814 2815 dwarf2_per_objfile->index_table = map; 2816 dwarf2_per_objfile->using_index = 1; 2817 dwarf2_per_objfile->quick_file_names_table = 2818 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units); 2819 2820 return 1; 2821 } 2822 2823 /* A helper for the "quick" functions which sets the global 2824 dwarf2_per_objfile according to OBJFILE. */ 2825 2826 static void 2827 dw2_setup (struct objfile *objfile) 2828 { 2829 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key); 2830 gdb_assert (dwarf2_per_objfile); 2831 } 2832 2833 /* die_reader_func for dw2_get_file_names. */ 2834 2835 static void 2836 dw2_get_file_names_reader (const struct die_reader_specs *reader, 2837 gdb_byte *info_ptr, 2838 struct die_info *comp_unit_die, 2839 int has_children, 2840 void *data) 2841 { 2842 struct dwarf2_cu *cu = reader->cu; 2843 struct dwarf2_per_cu_data *this_cu = cu->per_cu; 2844 struct objfile *objfile = dwarf2_per_objfile->objfile; 2845 struct dwarf2_per_cu_data *lh_cu; 2846 struct line_header *lh; 2847 struct attribute *attr; 2848 int i; 2849 const char *name, *comp_dir; 2850 void **slot; 2851 struct quick_file_names *qfn; 2852 unsigned int line_offset; 2853 2854 /* Our callers never want to match partial units -- instead they 2855 will match the enclosing full CU. */ 2856 if (comp_unit_die->tag == DW_TAG_partial_unit) 2857 { 2858 this_cu->v.quick->no_file_data = 1; 2859 return; 2860 } 2861 2862 /* If we're reading the line header for TUs, store it in the "per_cu" 2863 for tu_group. */ 2864 if (this_cu->is_debug_types) 2865 { 2866 struct type_unit_group *tu_group = data; 2867 2868 gdb_assert (tu_group != NULL); 2869 lh_cu = &tu_group->per_cu; 2870 } 2871 else 2872 lh_cu = this_cu; 2873 2874 lh = NULL; 2875 slot = NULL; 2876 line_offset = 0; 2877 2878 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu); 2879 if (attr) 2880 { 2881 struct quick_file_names find_entry; 2882 2883 line_offset = DW_UNSND (attr); 2884 2885 /* We may have already read in this line header (TU line header sharing). 2886 If we have we're done. */ 2887 find_entry.hash.dwo_unit = cu->dwo_unit; 2888 find_entry.hash.line_offset.sect_off = line_offset; 2889 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table, 2890 &find_entry, INSERT); 2891 if (*slot != NULL) 2892 { 2893 lh_cu->v.quick->file_names = *slot; 2894 return; 2895 } 2896 2897 lh = dwarf_decode_line_header (line_offset, cu); 2898 } 2899 if (lh == NULL) 2900 { 2901 lh_cu->v.quick->no_file_data = 1; 2902 return; 2903 } 2904 2905 qfn = obstack_alloc (&objfile->objfile_obstack, sizeof (*qfn)); 2906 qfn->hash.dwo_unit = cu->dwo_unit; 2907 qfn->hash.line_offset.sect_off = line_offset; 2908 gdb_assert (slot != NULL); 2909 *slot = qfn; 2910 2911 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir); 2912 2913 qfn->num_file_names = lh->num_file_names; 2914 qfn->file_names = obstack_alloc (&objfile->objfile_obstack, 2915 lh->num_file_names * sizeof (char *)); 2916 for (i = 0; i < lh->num_file_names; ++i) 2917 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir); 2918 qfn->real_names = NULL; 2919 2920 free_line_header (lh); 2921 2922 lh_cu->v.quick->file_names = qfn; 2923 } 2924 2925 /* A helper for the "quick" functions which attempts to read the line 2926 table for THIS_CU. */ 2927 2928 static struct quick_file_names * 2929 dw2_get_file_names (struct objfile *objfile, 2930 struct dwarf2_per_cu_data *this_cu) 2931 { 2932 /* For TUs this should only be called on the parent group. */ 2933 if (this_cu->is_debug_types) 2934 gdb_assert (IS_TYPE_UNIT_GROUP (this_cu)); 2935 2936 if (this_cu->v.quick->file_names != NULL) 2937 return this_cu->v.quick->file_names; 2938 /* If we know there is no line data, no point in looking again. */ 2939 if (this_cu->v.quick->no_file_data) 2940 return NULL; 2941 2942 /* If DWO files are in use, we can still find the DW_AT_stmt_list attribute 2943 in the stub for CUs, there's is no need to lookup the DWO file. 2944 However, that's not the case for TUs where DW_AT_stmt_list lives in the 2945 DWO file. */ 2946 if (this_cu->is_debug_types) 2947 { 2948 struct type_unit_group *tu_group = this_cu->type_unit_group; 2949 2950 init_cutu_and_read_dies (tu_group->t.first_tu, NULL, 0, 0, 2951 dw2_get_file_names_reader, tu_group); 2952 } 2953 else 2954 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL); 2955 2956 if (this_cu->v.quick->no_file_data) 2957 return NULL; 2958 return this_cu->v.quick->file_names; 2959 } 2960 2961 /* A helper for the "quick" functions which computes and caches the 2962 real path for a given file name from the line table. */ 2963 2964 static const char * 2965 dw2_get_real_path (struct objfile *objfile, 2966 struct quick_file_names *qfn, int index) 2967 { 2968 if (qfn->real_names == NULL) 2969 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack, 2970 qfn->num_file_names, sizeof (char *)); 2971 2972 if (qfn->real_names[index] == NULL) 2973 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]); 2974 2975 return qfn->real_names[index]; 2976 } 2977 2978 static struct symtab * 2979 dw2_find_last_source_symtab (struct objfile *objfile) 2980 { 2981 int index; 2982 2983 dw2_setup (objfile); 2984 index = dwarf2_per_objfile->n_comp_units - 1; 2985 return dw2_instantiate_symtab (dw2_get_cu (index)); 2986 } 2987 2988 /* Traversal function for dw2_forget_cached_source_info. */ 2989 2990 static int 2991 dw2_free_cached_file_names (void **slot, void *info) 2992 { 2993 struct quick_file_names *file_data = (struct quick_file_names *) *slot; 2994 2995 if (file_data->real_names) 2996 { 2997 int i; 2998 2999 for (i = 0; i < file_data->num_file_names; ++i) 3000 { 3001 xfree ((void*) file_data->real_names[i]); 3002 file_data->real_names[i] = NULL; 3003 } 3004 } 3005 3006 return 1; 3007 } 3008 3009 static void 3010 dw2_forget_cached_source_info (struct objfile *objfile) 3011 { 3012 dw2_setup (objfile); 3013 3014 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table, 3015 dw2_free_cached_file_names, NULL); 3016 } 3017 3018 /* Helper function for dw2_map_symtabs_matching_filename that expands 3019 the symtabs and calls the iterator. */ 3020 3021 static int 3022 dw2_map_expand_apply (struct objfile *objfile, 3023 struct dwarf2_per_cu_data *per_cu, 3024 const char *name, const char *real_path, 3025 int (*callback) (struct symtab *, void *), 3026 void *data) 3027 { 3028 struct symtab *last_made = objfile->symtabs; 3029 3030 /* Don't visit already-expanded CUs. */ 3031 if (per_cu->v.quick->symtab) 3032 return 0; 3033 3034 /* This may expand more than one symtab, and we want to iterate over 3035 all of them. */ 3036 dw2_instantiate_symtab (per_cu); 3037 3038 return iterate_over_some_symtabs (name, real_path, callback, data, 3039 objfile->symtabs, last_made); 3040 } 3041 3042 /* Implementation of the map_symtabs_matching_filename method. */ 3043 3044 static int 3045 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name, 3046 const char *real_path, 3047 int (*callback) (struct symtab *, void *), 3048 void *data) 3049 { 3050 int i; 3051 const char *name_basename = lbasename (name); 3052 3053 dw2_setup (objfile); 3054 3055 /* The rule is CUs specify all the files, including those used by 3056 any TU, so there's no need to scan TUs here. */ 3057 3058 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) 3059 { 3060 int j; 3061 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i); 3062 struct quick_file_names *file_data; 3063 3064 /* We only need to look at symtabs not already expanded. */ 3065 if (per_cu->v.quick->symtab) 3066 continue; 3067 3068 file_data = dw2_get_file_names (objfile, per_cu); 3069 if (file_data == NULL) 3070 continue; 3071 3072 for (j = 0; j < file_data->num_file_names; ++j) 3073 { 3074 const char *this_name = file_data->file_names[j]; 3075 const char *this_real_name; 3076 3077 if (compare_filenames_for_search (this_name, name)) 3078 { 3079 if (dw2_map_expand_apply (objfile, per_cu, name, real_path, 3080 callback, data)) 3081 return 1; 3082 } 3083 3084 /* Before we invoke realpath, which can get expensive when many 3085 files are involved, do a quick comparison of the basenames. */ 3086 if (! basenames_may_differ 3087 && FILENAME_CMP (lbasename (this_name), name_basename) != 0) 3088 continue; 3089 3090 this_real_name = dw2_get_real_path (objfile, file_data, j); 3091 if (compare_filenames_for_search (this_real_name, name)) 3092 { 3093 if (dw2_map_expand_apply (objfile, per_cu, name, real_path, 3094 callback, data)) 3095 return 1; 3096 } 3097 3098 if (real_path != NULL) 3099 { 3100 gdb_assert (IS_ABSOLUTE_PATH (real_path)); 3101 gdb_assert (IS_ABSOLUTE_PATH (name)); 3102 if (this_real_name != NULL 3103 && FILENAME_CMP (real_path, this_real_name) == 0) 3104 { 3105 if (dw2_map_expand_apply (objfile, per_cu, name, real_path, 3106 callback, data)) 3107 return 1; 3108 } 3109 } 3110 } 3111 } 3112 3113 return 0; 3114 } 3115 3116 /* Struct used to manage iterating over all CUs looking for a symbol. */ 3117 3118 struct dw2_symtab_iterator 3119 { 3120 /* The internalized form of .gdb_index. */ 3121 struct mapped_index *index; 3122 /* If non-zero, only look for symbols that match BLOCK_INDEX. */ 3123 int want_specific_block; 3124 /* One of GLOBAL_BLOCK or STATIC_BLOCK. 3125 Unused if !WANT_SPECIFIC_BLOCK. */ 3126 int block_index; 3127 /* The kind of symbol we're looking for. */ 3128 domain_enum domain; 3129 /* The list of CUs from the index entry of the symbol, 3130 or NULL if not found. */ 3131 offset_type *vec; 3132 /* The next element in VEC to look at. */ 3133 int next; 3134 /* The number of elements in VEC, or zero if there is no match. */ 3135 int length; 3136 }; 3137 3138 /* Initialize the index symtab iterator ITER. 3139 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols 3140 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */ 3141 3142 static void 3143 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter, 3144 struct mapped_index *index, 3145 int want_specific_block, 3146 int block_index, 3147 domain_enum domain, 3148 const char *name) 3149 { 3150 iter->index = index; 3151 iter->want_specific_block = want_specific_block; 3152 iter->block_index = block_index; 3153 iter->domain = domain; 3154 iter->next = 0; 3155 3156 if (find_slot_in_mapped_hash (index, name, &iter->vec)) 3157 iter->length = MAYBE_SWAP (*iter->vec); 3158 else 3159 { 3160 iter->vec = NULL; 3161 iter->length = 0; 3162 } 3163 } 3164 3165 /* Return the next matching CU or NULL if there are no more. */ 3166 3167 static struct dwarf2_per_cu_data * 3168 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter) 3169 { 3170 for ( ; iter->next < iter->length; ++iter->next) 3171 { 3172 offset_type cu_index_and_attrs = 3173 MAYBE_SWAP (iter->vec[iter->next + 1]); 3174 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs); 3175 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (cu_index); 3176 int want_static = iter->block_index != GLOBAL_BLOCK; 3177 /* This value is only valid for index versions >= 7. */ 3178 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs); 3179 gdb_index_symbol_kind symbol_kind = 3180 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs); 3181 /* Only check the symbol attributes if they're present. 3182 Indices prior to version 7 don't record them, 3183 and indices >= 7 may elide them for certain symbols 3184 (gold does this). */ 3185 int attrs_valid = 3186 (iter->index->version >= 7 3187 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE); 3188 3189 /* Skip if already read in. */ 3190 if (per_cu->v.quick->symtab) 3191 continue; 3192 3193 if (attrs_valid 3194 && iter->want_specific_block 3195 && want_static != is_static) 3196 continue; 3197 3198 /* Only check the symbol's kind if it has one. */ 3199 if (attrs_valid) 3200 { 3201 switch (iter->domain) 3202 { 3203 case VAR_DOMAIN: 3204 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE 3205 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION 3206 /* Some types are also in VAR_DOMAIN. */ 3207 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) 3208 continue; 3209 break; 3210 case STRUCT_DOMAIN: 3211 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) 3212 continue; 3213 break; 3214 case LABEL_DOMAIN: 3215 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER) 3216 continue; 3217 break; 3218 default: 3219 break; 3220 } 3221 } 3222 3223 ++iter->next; 3224 return per_cu; 3225 } 3226 3227 return NULL; 3228 } 3229 3230 static struct symtab * 3231 dw2_lookup_symbol (struct objfile *objfile, int block_index, 3232 const char *name, domain_enum domain) 3233 { 3234 struct symtab *stab_best = NULL; 3235 struct mapped_index *index; 3236 3237 dw2_setup (objfile); 3238 3239 index = dwarf2_per_objfile->index_table; 3240 3241 /* index is NULL if OBJF_READNOW. */ 3242 if (index) 3243 { 3244 struct dw2_symtab_iterator iter; 3245 struct dwarf2_per_cu_data *per_cu; 3246 3247 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name); 3248 3249 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL) 3250 { 3251 struct symbol *sym = NULL; 3252 struct symtab *stab = dw2_instantiate_symtab (per_cu); 3253 3254 /* Some caution must be observed with overloaded functions 3255 and methods, since the index will not contain any overload 3256 information (but NAME might contain it). */ 3257 if (stab->primary) 3258 { 3259 struct blockvector *bv = BLOCKVECTOR (stab); 3260 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index); 3261 3262 sym = lookup_block_symbol (block, name, domain); 3263 } 3264 3265 if (sym && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0) 3266 { 3267 if (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym))) 3268 return stab; 3269 3270 stab_best = stab; 3271 } 3272 3273 /* Keep looking through other CUs. */ 3274 } 3275 } 3276 3277 return stab_best; 3278 } 3279 3280 static void 3281 dw2_print_stats (struct objfile *objfile) 3282 { 3283 int i, count; 3284 3285 dw2_setup (objfile); 3286 count = 0; 3287 for (i = 0; i < (dwarf2_per_objfile->n_comp_units 3288 + dwarf2_per_objfile->n_type_units); ++i) 3289 { 3290 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); 3291 3292 if (!per_cu->v.quick->symtab) 3293 ++count; 3294 } 3295 printf_filtered (_(" Number of unread CUs: %d\n"), count); 3296 } 3297 3298 static void 3299 dw2_dump (struct objfile *objfile) 3300 { 3301 /* Nothing worth printing. */ 3302 } 3303 3304 static void 3305 dw2_relocate (struct objfile *objfile, struct section_offsets *new_offsets, 3306 struct section_offsets *delta) 3307 { 3308 /* There's nothing to relocate here. */ 3309 } 3310 3311 static void 3312 dw2_expand_symtabs_for_function (struct objfile *objfile, 3313 const char *func_name) 3314 { 3315 struct mapped_index *index; 3316 3317 dw2_setup (objfile); 3318 3319 index = dwarf2_per_objfile->index_table; 3320 3321 /* index is NULL if OBJF_READNOW. */ 3322 if (index) 3323 { 3324 struct dw2_symtab_iterator iter; 3325 struct dwarf2_per_cu_data *per_cu; 3326 3327 /* Note: It doesn't matter what we pass for block_index here. */ 3328 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN, 3329 func_name); 3330 3331 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL) 3332 dw2_instantiate_symtab (per_cu); 3333 } 3334 } 3335 3336 static void 3337 dw2_expand_all_symtabs (struct objfile *objfile) 3338 { 3339 int i; 3340 3341 dw2_setup (objfile); 3342 3343 for (i = 0; i < (dwarf2_per_objfile->n_comp_units 3344 + dwarf2_per_objfile->n_type_units); ++i) 3345 { 3346 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); 3347 3348 dw2_instantiate_symtab (per_cu); 3349 } 3350 } 3351 3352 static void 3353 dw2_expand_symtabs_with_fullname (struct objfile *objfile, 3354 const char *fullname) 3355 { 3356 int i; 3357 3358 dw2_setup (objfile); 3359 3360 /* We don't need to consider type units here. 3361 This is only called for examining code, e.g. expand_line_sal. 3362 There can be an order of magnitude (or more) more type units 3363 than comp units, and we avoid them if we can. */ 3364 3365 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) 3366 { 3367 int j; 3368 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); 3369 struct quick_file_names *file_data; 3370 3371 /* We only need to look at symtabs not already expanded. */ 3372 if (per_cu->v.quick->symtab) 3373 continue; 3374 3375 file_data = dw2_get_file_names (objfile, per_cu); 3376 if (file_data == NULL) 3377 continue; 3378 3379 for (j = 0; j < file_data->num_file_names; ++j) 3380 { 3381 const char *this_fullname = file_data->file_names[j]; 3382 3383 if (filename_cmp (this_fullname, fullname) == 0) 3384 { 3385 dw2_instantiate_symtab (per_cu); 3386 break; 3387 } 3388 } 3389 } 3390 } 3391 3392 /* A helper function for dw2_find_symbol_file that finds the primary 3393 file name for a given CU. This is a die_reader_func. */ 3394 3395 static void 3396 dw2_get_primary_filename_reader (const struct die_reader_specs *reader, 3397 gdb_byte *info_ptr, 3398 struct die_info *comp_unit_die, 3399 int has_children, 3400 void *data) 3401 { 3402 const char **result_ptr = data; 3403 struct dwarf2_cu *cu = reader->cu; 3404 struct attribute *attr; 3405 3406 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu); 3407 if (attr == NULL) 3408 *result_ptr = NULL; 3409 else 3410 *result_ptr = DW_STRING (attr); 3411 } 3412 3413 static const char * 3414 dw2_find_symbol_file (struct objfile *objfile, const char *name) 3415 { 3416 struct dwarf2_per_cu_data *per_cu; 3417 offset_type *vec; 3418 const char *filename; 3419 3420 dw2_setup (objfile); 3421 3422 /* index_table is NULL if OBJF_READNOW. */ 3423 if (!dwarf2_per_objfile->index_table) 3424 { 3425 struct symtab *s; 3426 3427 ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s) 3428 { 3429 struct blockvector *bv = BLOCKVECTOR (s); 3430 const struct block *block = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK); 3431 struct symbol *sym = lookup_block_symbol (block, name, VAR_DOMAIN); 3432 3433 if (sym) 3434 { 3435 /* Only file extension of returned filename is recognized. */ 3436 return SYMBOL_SYMTAB (sym)->filename; 3437 } 3438 } 3439 return NULL; 3440 } 3441 3442 if (!find_slot_in_mapped_hash (dwarf2_per_objfile->index_table, 3443 name, &vec)) 3444 return NULL; 3445 3446 /* Note that this just looks at the very first one named NAME -- but 3447 actually we are looking for a function. find_main_filename 3448 should be rewritten so that it doesn't require a custom hook. It 3449 could just use the ordinary symbol tables. */ 3450 /* vec[0] is the length, which must always be >0. */ 3451 per_cu = dw2_get_cu (GDB_INDEX_CU_VALUE (MAYBE_SWAP (vec[1]))); 3452 3453 if (per_cu->v.quick->symtab != NULL) 3454 { 3455 /* Only file extension of returned filename is recognized. */ 3456 return per_cu->v.quick->symtab->filename; 3457 } 3458 3459 init_cutu_and_read_dies (per_cu, NULL, 0, 0, 3460 dw2_get_primary_filename_reader, &filename); 3461 3462 /* Only file extension of returned filename is recognized. */ 3463 return filename; 3464 } 3465 3466 static void 3467 dw2_map_matching_symbols (const char * name, domain_enum namespace, 3468 struct objfile *objfile, int global, 3469 int (*callback) (struct block *, 3470 struct symbol *, void *), 3471 void *data, symbol_compare_ftype *match, 3472 symbol_compare_ftype *ordered_compare) 3473 { 3474 /* Currently unimplemented; used for Ada. The function can be called if the 3475 current language is Ada for a non-Ada objfile using GNU index. As Ada 3476 does not look for non-Ada symbols this function should just return. */ 3477 } 3478 3479 static void 3480 dw2_expand_symtabs_matching 3481 (struct objfile *objfile, 3482 int (*file_matcher) (const char *, void *, int basenames), 3483 int (*name_matcher) (const char *, void *), 3484 enum search_domain kind, 3485 void *data) 3486 { 3487 int i; 3488 offset_type iter; 3489 struct mapped_index *index; 3490 3491 dw2_setup (objfile); 3492 3493 /* index_table is NULL if OBJF_READNOW. */ 3494 if (!dwarf2_per_objfile->index_table) 3495 return; 3496 index = dwarf2_per_objfile->index_table; 3497 3498 if (file_matcher != NULL) 3499 { 3500 struct cleanup *cleanup; 3501 htab_t visited_found, visited_not_found; 3502 3503 visited_found = htab_create_alloc (10, 3504 htab_hash_pointer, htab_eq_pointer, 3505 NULL, xcalloc, xfree); 3506 cleanup = make_cleanup_htab_delete (visited_found); 3507 visited_not_found = htab_create_alloc (10, 3508 htab_hash_pointer, htab_eq_pointer, 3509 NULL, xcalloc, xfree); 3510 make_cleanup_htab_delete (visited_not_found); 3511 3512 /* The rule is CUs specify all the files, including those used by 3513 any TU, so there's no need to scan TUs here. */ 3514 3515 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) 3516 { 3517 int j; 3518 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i); 3519 struct quick_file_names *file_data; 3520 void **slot; 3521 3522 per_cu->v.quick->mark = 0; 3523 3524 /* We only need to look at symtabs not already expanded. */ 3525 if (per_cu->v.quick->symtab) 3526 continue; 3527 3528 file_data = dw2_get_file_names (objfile, per_cu); 3529 if (file_data == NULL) 3530 continue; 3531 3532 if (htab_find (visited_not_found, file_data) != NULL) 3533 continue; 3534 else if (htab_find (visited_found, file_data) != NULL) 3535 { 3536 per_cu->v.quick->mark = 1; 3537 continue; 3538 } 3539 3540 for (j = 0; j < file_data->num_file_names; ++j) 3541 { 3542 const char *this_real_name; 3543 3544 if (file_matcher (file_data->file_names[j], data, 0)) 3545 { 3546 per_cu->v.quick->mark = 1; 3547 break; 3548 } 3549 3550 /* Before we invoke realpath, which can get expensive when many 3551 files are involved, do a quick comparison of the basenames. */ 3552 if (!basenames_may_differ 3553 && !file_matcher (lbasename (file_data->file_names[j]), 3554 data, 1)) 3555 continue; 3556 3557 this_real_name = dw2_get_real_path (objfile, file_data, j); 3558 if (file_matcher (this_real_name, data, 0)) 3559 { 3560 per_cu->v.quick->mark = 1; 3561 break; 3562 } 3563 } 3564 3565 slot = htab_find_slot (per_cu->v.quick->mark 3566 ? visited_found 3567 : visited_not_found, 3568 file_data, INSERT); 3569 *slot = file_data; 3570 } 3571 3572 do_cleanups (cleanup); 3573 } 3574 3575 for (iter = 0; iter < index->symbol_table_slots; ++iter) 3576 { 3577 offset_type idx = 2 * iter; 3578 const char *name; 3579 offset_type *vec, vec_len, vec_idx; 3580 3581 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0) 3582 continue; 3583 3584 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]); 3585 3586 if (! (*name_matcher) (name, data)) 3587 continue; 3588 3589 /* The name was matched, now expand corresponding CUs that were 3590 marked. */ 3591 vec = (offset_type *) (index->constant_pool 3592 + MAYBE_SWAP (index->symbol_table[idx + 1])); 3593 vec_len = MAYBE_SWAP (vec[0]); 3594 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx) 3595 { 3596 struct dwarf2_per_cu_data *per_cu; 3597 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]); 3598 gdb_index_symbol_kind symbol_kind = 3599 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs); 3600 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs); 3601 3602 /* Don't crash on bad data. */ 3603 if (cu_index >= (dwarf2_per_objfile->n_comp_units 3604 + dwarf2_per_objfile->n_type_units)) 3605 continue; 3606 3607 /* Only check the symbol's kind if it has one. 3608 Indices prior to version 7 don't record it. */ 3609 if (index->version >= 7) 3610 { 3611 switch (kind) 3612 { 3613 case VARIABLES_DOMAIN: 3614 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE) 3615 continue; 3616 break; 3617 case FUNCTIONS_DOMAIN: 3618 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION) 3619 continue; 3620 break; 3621 case TYPES_DOMAIN: 3622 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) 3623 continue; 3624 break; 3625 default: 3626 break; 3627 } 3628 } 3629 3630 per_cu = dw2_get_cu (cu_index); 3631 if (file_matcher == NULL || per_cu->v.quick->mark) 3632 dw2_instantiate_symtab (per_cu); 3633 } 3634 } 3635 } 3636 3637 /* A helper for dw2_find_pc_sect_symtab which finds the most specific 3638 symtab. */ 3639 3640 static struct symtab * 3641 recursively_find_pc_sect_symtab (struct symtab *symtab, CORE_ADDR pc) 3642 { 3643 int i; 3644 3645 if (BLOCKVECTOR (symtab) != NULL 3646 && blockvector_contains_pc (BLOCKVECTOR (symtab), pc)) 3647 return symtab; 3648 3649 if (symtab->includes == NULL) 3650 return NULL; 3651 3652 for (i = 0; symtab->includes[i]; ++i) 3653 { 3654 struct symtab *s = symtab->includes[i]; 3655 3656 s = recursively_find_pc_sect_symtab (s, pc); 3657 if (s != NULL) 3658 return s; 3659 } 3660 3661 return NULL; 3662 } 3663 3664 static struct symtab * 3665 dw2_find_pc_sect_symtab (struct objfile *objfile, 3666 struct minimal_symbol *msymbol, 3667 CORE_ADDR pc, 3668 struct obj_section *section, 3669 int warn_if_readin) 3670 { 3671 struct dwarf2_per_cu_data *data; 3672 struct symtab *result; 3673 3674 dw2_setup (objfile); 3675 3676 if (!objfile->psymtabs_addrmap) 3677 return NULL; 3678 3679 data = addrmap_find (objfile->psymtabs_addrmap, pc); 3680 if (!data) 3681 return NULL; 3682 3683 if (warn_if_readin && data->v.quick->symtab) 3684 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"), 3685 paddress (get_objfile_arch (objfile), pc)); 3686 3687 result = recursively_find_pc_sect_symtab (dw2_instantiate_symtab (data), pc); 3688 gdb_assert (result != NULL); 3689 return result; 3690 } 3691 3692 static void 3693 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun, 3694 void *data, int need_fullname) 3695 { 3696 int i; 3697 struct cleanup *cleanup; 3698 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer, 3699 NULL, xcalloc, xfree); 3700 3701 cleanup = make_cleanup_htab_delete (visited); 3702 dw2_setup (objfile); 3703 3704 /* The rule is CUs specify all the files, including those used by 3705 any TU, so there's no need to scan TUs here. 3706 We can ignore file names coming from already-expanded CUs. */ 3707 3708 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) 3709 { 3710 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); 3711 3712 if (per_cu->v.quick->symtab) 3713 { 3714 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names, 3715 INSERT); 3716 3717 *slot = per_cu->v.quick->file_names; 3718 } 3719 } 3720 3721 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) 3722 { 3723 int j; 3724 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i); 3725 struct quick_file_names *file_data; 3726 void **slot; 3727 3728 /* We only need to look at symtabs not already expanded. */ 3729 if (per_cu->v.quick->symtab) 3730 continue; 3731 3732 file_data = dw2_get_file_names (objfile, per_cu); 3733 if (file_data == NULL) 3734 continue; 3735 3736 slot = htab_find_slot (visited, file_data, INSERT); 3737 if (*slot) 3738 { 3739 /* Already visited. */ 3740 continue; 3741 } 3742 *slot = file_data; 3743 3744 for (j = 0; j < file_data->num_file_names; ++j) 3745 { 3746 const char *this_real_name; 3747 3748 if (need_fullname) 3749 this_real_name = dw2_get_real_path (objfile, file_data, j); 3750 else 3751 this_real_name = NULL; 3752 (*fun) (file_data->file_names[j], this_real_name, data); 3753 } 3754 } 3755 3756 do_cleanups (cleanup); 3757 } 3758 3759 static int 3760 dw2_has_symbols (struct objfile *objfile) 3761 { 3762 return 1; 3763 } 3764 3765 const struct quick_symbol_functions dwarf2_gdb_index_functions = 3766 { 3767 dw2_has_symbols, 3768 dw2_find_last_source_symtab, 3769 dw2_forget_cached_source_info, 3770 dw2_map_symtabs_matching_filename, 3771 dw2_lookup_symbol, 3772 dw2_print_stats, 3773 dw2_dump, 3774 dw2_relocate, 3775 dw2_expand_symtabs_for_function, 3776 dw2_expand_all_symtabs, 3777 dw2_expand_symtabs_with_fullname, 3778 dw2_find_symbol_file, 3779 dw2_map_matching_symbols, 3780 dw2_expand_symtabs_matching, 3781 dw2_find_pc_sect_symtab, 3782 dw2_map_symbol_filenames 3783 }; 3784 3785 /* Initialize for reading DWARF for this objfile. Return 0 if this 3786 file will use psymtabs, or 1 if using the GNU index. */ 3787 3788 int 3789 dwarf2_initialize_objfile (struct objfile *objfile) 3790 { 3791 /* If we're about to read full symbols, don't bother with the 3792 indices. In this case we also don't care if some other debug 3793 format is making psymtabs, because they are all about to be 3794 expanded anyway. */ 3795 if ((objfile->flags & OBJF_READNOW)) 3796 { 3797 int i; 3798 3799 dwarf2_per_objfile->using_index = 1; 3800 create_all_comp_units (objfile); 3801 create_all_type_units (objfile); 3802 dwarf2_per_objfile->quick_file_names_table = 3803 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units); 3804 3805 for (i = 0; i < (dwarf2_per_objfile->n_comp_units 3806 + dwarf2_per_objfile->n_type_units); ++i) 3807 { 3808 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); 3809 3810 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack, 3811 struct dwarf2_per_cu_quick_data); 3812 } 3813 3814 /* Return 1 so that gdb sees the "quick" functions. However, 3815 these functions will be no-ops because we will have expanded 3816 all symtabs. */ 3817 return 1; 3818 } 3819 3820 if (dwarf2_read_index (objfile)) 3821 return 1; 3822 3823 return 0; 3824 } 3825 3826 3827 3828 /* Build a partial symbol table. */ 3829 3830 void 3831 dwarf2_build_psymtabs (struct objfile *objfile) 3832 { 3833 volatile struct gdb_exception except; 3834 3835 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0) 3836 { 3837 init_psymbol_list (objfile, 1024); 3838 } 3839 3840 TRY_CATCH (except, RETURN_MASK_ERROR) 3841 { 3842 /* This isn't really ideal: all the data we allocate on the 3843 objfile's obstack is still uselessly kept around. However, 3844 freeing it seems unsafe. */ 3845 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile); 3846 3847 dwarf2_build_psymtabs_hard (objfile); 3848 discard_cleanups (cleanups); 3849 } 3850 if (except.reason < 0) 3851 exception_print (gdb_stderr, except); 3852 } 3853 3854 /* Return the total length of the CU described by HEADER. */ 3855 3856 static unsigned int 3857 get_cu_length (const struct comp_unit_head *header) 3858 { 3859 return header->initial_length_size + header->length; 3860 } 3861 3862 /* Return TRUE if OFFSET is within CU_HEADER. */ 3863 3864 static inline int 3865 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset) 3866 { 3867 sect_offset bottom = { cu_header->offset.sect_off }; 3868 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) }; 3869 3870 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off); 3871 } 3872 3873 /* Find the base address of the compilation unit for range lists and 3874 location lists. It will normally be specified by DW_AT_low_pc. 3875 In DWARF-3 draft 4, the base address could be overridden by 3876 DW_AT_entry_pc. It's been removed, but GCC still uses this for 3877 compilation units with discontinuous ranges. */ 3878 3879 static void 3880 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu) 3881 { 3882 struct attribute *attr; 3883 3884 cu->base_known = 0; 3885 cu->base_address = 0; 3886 3887 attr = dwarf2_attr (die, DW_AT_entry_pc, cu); 3888 if (attr) 3889 { 3890 cu->base_address = DW_ADDR (attr); 3891 cu->base_known = 1; 3892 } 3893 else 3894 { 3895 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 3896 if (attr) 3897 { 3898 cu->base_address = DW_ADDR (attr); 3899 cu->base_known = 1; 3900 } 3901 } 3902 } 3903 3904 /* Read in the comp unit header information from the debug_info at info_ptr. 3905 NOTE: This leaves members offset, first_die_offset to be filled in 3906 by the caller. */ 3907 3908 static gdb_byte * 3909 read_comp_unit_head (struct comp_unit_head *cu_header, 3910 gdb_byte *info_ptr, bfd *abfd) 3911 { 3912 int signed_addr; 3913 unsigned int bytes_read; 3914 3915 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read); 3916 cu_header->initial_length_size = bytes_read; 3917 cu_header->offset_size = (bytes_read == 4) ? 4 : 8; 3918 info_ptr += bytes_read; 3919 cu_header->version = read_2_bytes (abfd, info_ptr); 3920 info_ptr += 2; 3921 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header, 3922 &bytes_read); 3923 info_ptr += bytes_read; 3924 cu_header->addr_size = read_1_byte (abfd, info_ptr); 3925 info_ptr += 1; 3926 signed_addr = bfd_get_sign_extend_vma (abfd); 3927 if (signed_addr < 0) 3928 internal_error (__FILE__, __LINE__, 3929 _("read_comp_unit_head: dwarf from non elf file")); 3930 cu_header->signed_addr_p = signed_addr; 3931 3932 return info_ptr; 3933 } 3934 3935 /* Helper function that returns the proper abbrev section for 3936 THIS_CU. */ 3937 3938 static struct dwarf2_section_info * 3939 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu) 3940 { 3941 struct dwarf2_section_info *abbrev; 3942 3943 if (this_cu->is_dwz) 3944 abbrev = &dwarf2_get_dwz_file ()->abbrev; 3945 else 3946 abbrev = &dwarf2_per_objfile->abbrev; 3947 3948 return abbrev; 3949 } 3950 3951 /* Subroutine of read_and_check_comp_unit_head and 3952 read_and_check_type_unit_head to simplify them. 3953 Perform various error checking on the header. */ 3954 3955 static void 3956 error_check_comp_unit_head (struct comp_unit_head *header, 3957 struct dwarf2_section_info *section, 3958 struct dwarf2_section_info *abbrev_section) 3959 { 3960 bfd *abfd = section->asection->owner; 3961 const char *filename = bfd_get_filename (abfd); 3962 3963 if (header->version != 2 && header->version != 3 && header->version != 4) 3964 error (_("Dwarf Error: wrong version in compilation unit header " 3965 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version, 3966 filename); 3967 3968 if (header->abbrev_offset.sect_off 3969 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section)) 3970 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header " 3971 "(offset 0x%lx + 6) [in module %s]"), 3972 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off, 3973 filename); 3974 3975 /* Cast to unsigned long to use 64-bit arithmetic when possible to 3976 avoid potential 32-bit overflow. */ 3977 if (((unsigned long) header->offset.sect_off + get_cu_length (header)) 3978 > section->size) 3979 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header " 3980 "(offset 0x%lx + 0) [in module %s]"), 3981 (long) header->length, (long) header->offset.sect_off, 3982 filename); 3983 } 3984 3985 /* Read in a CU/TU header and perform some basic error checking. 3986 The contents of the header are stored in HEADER. 3987 The result is a pointer to the start of the first DIE. */ 3988 3989 static gdb_byte * 3990 read_and_check_comp_unit_head (struct comp_unit_head *header, 3991 struct dwarf2_section_info *section, 3992 struct dwarf2_section_info *abbrev_section, 3993 gdb_byte *info_ptr, 3994 int is_debug_types_section) 3995 { 3996 gdb_byte *beg_of_comp_unit = info_ptr; 3997 bfd *abfd = section->asection->owner; 3998 3999 header->offset.sect_off = beg_of_comp_unit - section->buffer; 4000 4001 info_ptr = read_comp_unit_head (header, info_ptr, abfd); 4002 4003 /* If we're reading a type unit, skip over the signature and 4004 type_offset fields. */ 4005 if (is_debug_types_section) 4006 info_ptr += 8 /*signature*/ + header->offset_size; 4007 4008 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit; 4009 4010 error_check_comp_unit_head (header, section, abbrev_section); 4011 4012 return info_ptr; 4013 } 4014 4015 /* Read in the types comp unit header information from .debug_types entry at 4016 types_ptr. The result is a pointer to one past the end of the header. */ 4017 4018 static gdb_byte * 4019 read_and_check_type_unit_head (struct comp_unit_head *header, 4020 struct dwarf2_section_info *section, 4021 struct dwarf2_section_info *abbrev_section, 4022 gdb_byte *info_ptr, 4023 ULONGEST *signature, 4024 cu_offset *type_offset_in_tu) 4025 { 4026 gdb_byte *beg_of_comp_unit = info_ptr; 4027 bfd *abfd = section->asection->owner; 4028 4029 header->offset.sect_off = beg_of_comp_unit - section->buffer; 4030 4031 info_ptr = read_comp_unit_head (header, info_ptr, abfd); 4032 4033 /* If we're reading a type unit, skip over the signature and 4034 type_offset fields. */ 4035 if (signature != NULL) 4036 *signature = read_8_bytes (abfd, info_ptr); 4037 info_ptr += 8; 4038 if (type_offset_in_tu != NULL) 4039 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr, 4040 header->offset_size); 4041 info_ptr += header->offset_size; 4042 4043 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit; 4044 4045 error_check_comp_unit_head (header, section, abbrev_section); 4046 4047 return info_ptr; 4048 } 4049 4050 /* Fetch the abbreviation table offset from a comp or type unit header. */ 4051 4052 static sect_offset 4053 read_abbrev_offset (struct dwarf2_section_info *section, 4054 sect_offset offset) 4055 { 4056 bfd *abfd = section->asection->owner; 4057 gdb_byte *info_ptr; 4058 unsigned int length, initial_length_size, offset_size; 4059 sect_offset abbrev_offset; 4060 4061 dwarf2_read_section (dwarf2_per_objfile->objfile, section); 4062 info_ptr = section->buffer + offset.sect_off; 4063 length = read_initial_length (abfd, info_ptr, &initial_length_size); 4064 offset_size = initial_length_size == 4 ? 4 : 8; 4065 info_ptr += initial_length_size + 2 /*version*/; 4066 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size); 4067 return abbrev_offset; 4068 } 4069 4070 /* Allocate a new partial symtab for file named NAME and mark this new 4071 partial symtab as being an include of PST. */ 4072 4073 static void 4074 dwarf2_create_include_psymtab (char *name, struct partial_symtab *pst, 4075 struct objfile *objfile) 4076 { 4077 struct partial_symtab *subpst = allocate_psymtab (name, objfile); 4078 4079 if (!IS_ABSOLUTE_PATH (subpst->filename)) 4080 { 4081 /* It shares objfile->objfile_obstack. */ 4082 subpst->dirname = pst->dirname; 4083 } 4084 4085 subpst->section_offsets = pst->section_offsets; 4086 subpst->textlow = 0; 4087 subpst->texthigh = 0; 4088 4089 subpst->dependencies = (struct partial_symtab **) 4090 obstack_alloc (&objfile->objfile_obstack, 4091 sizeof (struct partial_symtab *)); 4092 subpst->dependencies[0] = pst; 4093 subpst->number_of_dependencies = 1; 4094 4095 subpst->globals_offset = 0; 4096 subpst->n_global_syms = 0; 4097 subpst->statics_offset = 0; 4098 subpst->n_static_syms = 0; 4099 subpst->symtab = NULL; 4100 subpst->read_symtab = pst->read_symtab; 4101 subpst->readin = 0; 4102 4103 /* No private part is necessary for include psymtabs. This property 4104 can be used to differentiate between such include psymtabs and 4105 the regular ones. */ 4106 subpst->read_symtab_private = NULL; 4107 } 4108 4109 /* Read the Line Number Program data and extract the list of files 4110 included by the source file represented by PST. Build an include 4111 partial symtab for each of these included files. */ 4112 4113 static void 4114 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu, 4115 struct die_info *die, 4116 struct partial_symtab *pst) 4117 { 4118 struct line_header *lh = NULL; 4119 struct attribute *attr; 4120 4121 attr = dwarf2_attr (die, DW_AT_stmt_list, cu); 4122 if (attr) 4123 lh = dwarf_decode_line_header (DW_UNSND (attr), cu); 4124 if (lh == NULL) 4125 return; /* No linetable, so no includes. */ 4126 4127 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */ 4128 dwarf_decode_lines (lh, pst->dirname, cu, pst, 1); 4129 4130 free_line_header (lh); 4131 } 4132 4133 static hashval_t 4134 hash_signatured_type (const void *item) 4135 { 4136 const struct signatured_type *sig_type = item; 4137 4138 /* This drops the top 32 bits of the signature, but is ok for a hash. */ 4139 return sig_type->signature; 4140 } 4141 4142 static int 4143 eq_signatured_type (const void *item_lhs, const void *item_rhs) 4144 { 4145 const struct signatured_type *lhs = item_lhs; 4146 const struct signatured_type *rhs = item_rhs; 4147 4148 return lhs->signature == rhs->signature; 4149 } 4150 4151 /* Allocate a hash table for signatured types. */ 4152 4153 static htab_t 4154 allocate_signatured_type_table (struct objfile *objfile) 4155 { 4156 return htab_create_alloc_ex (41, 4157 hash_signatured_type, 4158 eq_signatured_type, 4159 NULL, 4160 &objfile->objfile_obstack, 4161 hashtab_obstack_allocate, 4162 dummy_obstack_deallocate); 4163 } 4164 4165 /* A helper function to add a signatured type CU to a table. */ 4166 4167 static int 4168 add_signatured_type_cu_to_table (void **slot, void *datum) 4169 { 4170 struct signatured_type *sigt = *slot; 4171 struct signatured_type ***datap = datum; 4172 4173 **datap = sigt; 4174 ++*datap; 4175 4176 return 1; 4177 } 4178 4179 /* Create the hash table of all entries in the .debug_types section. 4180 DWO_FILE is a pointer to the DWO file for .debug_types.dwo, 4181 NULL otherwise. 4182 Note: This function processes DWO files only, not DWP files. 4183 The result is a pointer to the hash table or NULL if there are 4184 no types. */ 4185 4186 static htab_t 4187 create_debug_types_hash_table (struct dwo_file *dwo_file, 4188 VEC (dwarf2_section_info_def) *types) 4189 { 4190 struct objfile *objfile = dwarf2_per_objfile->objfile; 4191 htab_t types_htab = NULL; 4192 int ix; 4193 struct dwarf2_section_info *section; 4194 struct dwarf2_section_info *abbrev_section; 4195 4196 if (VEC_empty (dwarf2_section_info_def, types)) 4197 return NULL; 4198 4199 abbrev_section = (dwo_file != NULL 4200 ? &dwo_file->sections.abbrev 4201 : &dwarf2_per_objfile->abbrev); 4202 4203 if (dwarf2_read_debug) 4204 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n", 4205 dwo_file ? ".dwo" : "", 4206 bfd_get_filename (abbrev_section->asection->owner)); 4207 4208 for (ix = 0; 4209 VEC_iterate (dwarf2_section_info_def, types, ix, section); 4210 ++ix) 4211 { 4212 bfd *abfd; 4213 gdb_byte *info_ptr, *end_ptr; 4214 struct dwarf2_section_info *abbrev_section; 4215 4216 dwarf2_read_section (objfile, section); 4217 info_ptr = section->buffer; 4218 4219 if (info_ptr == NULL) 4220 continue; 4221 4222 /* We can't set abfd until now because the section may be empty or 4223 not present, in which case section->asection will be NULL. */ 4224 abfd = section->asection->owner; 4225 4226 if (dwo_file) 4227 abbrev_section = &dwo_file->sections.abbrev; 4228 else 4229 abbrev_section = &dwarf2_per_objfile->abbrev; 4230 4231 if (types_htab == NULL) 4232 { 4233 if (dwo_file) 4234 types_htab = allocate_dwo_unit_table (objfile); 4235 else 4236 types_htab = allocate_signatured_type_table (objfile); 4237 } 4238 4239 /* We don't use init_cutu_and_read_dies_simple, or some such, here 4240 because we don't need to read any dies: the signature is in the 4241 header. */ 4242 4243 end_ptr = info_ptr + section->size; 4244 while (info_ptr < end_ptr) 4245 { 4246 sect_offset offset; 4247 cu_offset type_offset_in_tu; 4248 ULONGEST signature; 4249 struct signatured_type *sig_type; 4250 struct dwo_unit *dwo_tu; 4251 void **slot; 4252 gdb_byte *ptr = info_ptr; 4253 struct comp_unit_head header; 4254 unsigned int length; 4255 4256 offset.sect_off = ptr - section->buffer; 4257 4258 /* We need to read the type's signature in order to build the hash 4259 table, but we don't need anything else just yet. */ 4260 4261 ptr = read_and_check_type_unit_head (&header, section, 4262 abbrev_section, ptr, 4263 &signature, &type_offset_in_tu); 4264 4265 length = get_cu_length (&header); 4266 4267 /* Skip dummy type units. */ 4268 if (ptr >= info_ptr + length 4269 || peek_abbrev_code (abfd, ptr) == 0) 4270 { 4271 info_ptr += length; 4272 continue; 4273 } 4274 4275 if (dwo_file) 4276 { 4277 sig_type = NULL; 4278 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack, 4279 struct dwo_unit); 4280 dwo_tu->dwo_file = dwo_file; 4281 dwo_tu->signature = signature; 4282 dwo_tu->type_offset_in_tu = type_offset_in_tu; 4283 dwo_tu->info_or_types_section = section; 4284 dwo_tu->offset = offset; 4285 dwo_tu->length = length; 4286 } 4287 else 4288 { 4289 /* N.B.: type_offset is not usable if this type uses a DWO file. 4290 The real type_offset is in the DWO file. */ 4291 dwo_tu = NULL; 4292 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack, 4293 struct signatured_type); 4294 sig_type->signature = signature; 4295 sig_type->type_offset_in_tu = type_offset_in_tu; 4296 sig_type->per_cu.objfile = objfile; 4297 sig_type->per_cu.is_debug_types = 1; 4298 sig_type->per_cu.info_or_types_section = section; 4299 sig_type->per_cu.offset = offset; 4300 sig_type->per_cu.length = length; 4301 } 4302 4303 slot = htab_find_slot (types_htab, 4304 dwo_file ? (void*) dwo_tu : (void *) sig_type, 4305 INSERT); 4306 gdb_assert (slot != NULL); 4307 if (*slot != NULL) 4308 { 4309 sect_offset dup_offset; 4310 4311 if (dwo_file) 4312 { 4313 const struct dwo_unit *dup_tu = *slot; 4314 4315 dup_offset = dup_tu->offset; 4316 } 4317 else 4318 { 4319 const struct signatured_type *dup_tu = *slot; 4320 4321 dup_offset = dup_tu->per_cu.offset; 4322 } 4323 4324 complaint (&symfile_complaints, 4325 _("debug type entry at offset 0x%x is duplicate to the " 4326 "entry at offset 0x%x, signature 0x%s"), 4327 offset.sect_off, dup_offset.sect_off, 4328 phex (signature, sizeof (signature))); 4329 } 4330 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type; 4331 4332 if (dwarf2_read_debug) 4333 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature 0x%s\n", 4334 offset.sect_off, 4335 phex (signature, sizeof (signature))); 4336 4337 info_ptr += length; 4338 } 4339 } 4340 4341 return types_htab; 4342 } 4343 4344 /* Create the hash table of all entries in the .debug_types section, 4345 and initialize all_type_units. 4346 The result is zero if there is an error (e.g. missing .debug_types section), 4347 otherwise non-zero. */ 4348 4349 static int 4350 create_all_type_units (struct objfile *objfile) 4351 { 4352 htab_t types_htab; 4353 struct signatured_type **iter; 4354 4355 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types); 4356 if (types_htab == NULL) 4357 { 4358 dwarf2_per_objfile->signatured_types = NULL; 4359 return 0; 4360 } 4361 4362 dwarf2_per_objfile->signatured_types = types_htab; 4363 4364 dwarf2_per_objfile->n_type_units = htab_elements (types_htab); 4365 dwarf2_per_objfile->all_type_units 4366 = obstack_alloc (&objfile->objfile_obstack, 4367 dwarf2_per_objfile->n_type_units 4368 * sizeof (struct signatured_type *)); 4369 iter = &dwarf2_per_objfile->all_type_units[0]; 4370 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter); 4371 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0] 4372 == dwarf2_per_objfile->n_type_units); 4373 4374 return 1; 4375 } 4376 4377 /* Lookup a signature based type for DW_FORM_ref_sig8. 4378 Returns NULL if signature SIG is not present in the table. */ 4379 4380 static struct signatured_type * 4381 lookup_signatured_type (ULONGEST sig) 4382 { 4383 struct signatured_type find_entry, *entry; 4384 4385 if (dwarf2_per_objfile->signatured_types == NULL) 4386 { 4387 complaint (&symfile_complaints, 4388 _("missing `.debug_types' section for DW_FORM_ref_sig8 die")); 4389 return NULL; 4390 } 4391 4392 find_entry.signature = sig; 4393 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry); 4394 return entry; 4395 } 4396 4397 /* Low level DIE reading support. */ 4398 4399 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */ 4400 4401 static void 4402 init_cu_die_reader (struct die_reader_specs *reader, 4403 struct dwarf2_cu *cu, 4404 struct dwarf2_section_info *section, 4405 struct dwo_file *dwo_file) 4406 { 4407 gdb_assert (section->readin && section->buffer != NULL); 4408 reader->abfd = section->asection->owner; 4409 reader->cu = cu; 4410 reader->dwo_file = dwo_file; 4411 reader->die_section = section; 4412 reader->buffer = section->buffer; 4413 reader->buffer_end = section->buffer + section->size; 4414 } 4415 4416 /* Initialize a CU (or TU) and read its DIEs. 4417 If the CU defers to a DWO file, read the DWO file as well. 4418 4419 ABBREV_TABLE, if non-NULL, is the abbreviation table to use. 4420 Otherwise the table specified in the comp unit header is read in and used. 4421 This is an optimization for when we already have the abbrev table. 4422 4423 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it. 4424 Otherwise, a new CU is allocated with xmalloc. 4425 4426 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to 4427 read_in_chain. Otherwise the dwarf2_cu data is freed at the end. 4428 4429 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental 4430 linker) then DIE_READER_FUNC will not get called. */ 4431 4432 static void 4433 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu, 4434 struct abbrev_table *abbrev_table, 4435 int use_existing_cu, int keep, 4436 die_reader_func_ftype *die_reader_func, 4437 void *data) 4438 { 4439 struct objfile *objfile = dwarf2_per_objfile->objfile; 4440 struct dwarf2_section_info *section = this_cu->info_or_types_section; 4441 bfd *abfd = section->asection->owner; 4442 struct dwarf2_cu *cu; 4443 gdb_byte *begin_info_ptr, *info_ptr; 4444 struct die_reader_specs reader; 4445 struct die_info *comp_unit_die; 4446 int has_children; 4447 struct attribute *attr; 4448 struct cleanup *cleanups, *free_cu_cleanup = NULL; 4449 struct signatured_type *sig_type = NULL; 4450 struct dwarf2_section_info *abbrev_section; 4451 /* Non-zero if CU currently points to a DWO file and we need to 4452 reread it. When this happens we need to reread the skeleton die 4453 before we can reread the DWO file. */ 4454 int rereading_dwo_cu = 0; 4455 4456 if (dwarf2_die_debug) 4457 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n", 4458 this_cu->is_debug_types ? "type" : "comp", 4459 this_cu->offset.sect_off); 4460 4461 if (use_existing_cu) 4462 gdb_assert (keep); 4463 4464 cleanups = make_cleanup (null_cleanup, NULL); 4465 4466 /* This is cheap if the section is already read in. */ 4467 dwarf2_read_section (objfile, section); 4468 4469 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off; 4470 4471 abbrev_section = get_abbrev_section_for_cu (this_cu); 4472 4473 if (use_existing_cu && this_cu->cu != NULL) 4474 { 4475 cu = this_cu->cu; 4476 4477 /* If this CU is from a DWO file we need to start over, we need to 4478 refetch the attributes from the skeleton CU. 4479 This could be optimized by retrieving those attributes from when we 4480 were here the first time: the previous comp_unit_die was stored in 4481 comp_unit_obstack. But there's no data yet that we need this 4482 optimization. */ 4483 if (cu->dwo_unit != NULL) 4484 rereading_dwo_cu = 1; 4485 } 4486 else 4487 { 4488 /* If !use_existing_cu, this_cu->cu must be NULL. */ 4489 gdb_assert (this_cu->cu == NULL); 4490 4491 cu = xmalloc (sizeof (*cu)); 4492 init_one_comp_unit (cu, this_cu); 4493 4494 /* If an error occurs while loading, release our storage. */ 4495 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu); 4496 } 4497 4498 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu) 4499 { 4500 /* We already have the header, there's no need to read it in again. */ 4501 info_ptr += cu->header.first_die_offset.cu_off; 4502 } 4503 else 4504 { 4505 if (this_cu->is_debug_types) 4506 { 4507 ULONGEST signature; 4508 cu_offset type_offset_in_tu; 4509 4510 info_ptr = read_and_check_type_unit_head (&cu->header, section, 4511 abbrev_section, info_ptr, 4512 &signature, 4513 &type_offset_in_tu); 4514 4515 /* Since per_cu is the first member of struct signatured_type, 4516 we can go from a pointer to one to a pointer to the other. */ 4517 sig_type = (struct signatured_type *) this_cu; 4518 gdb_assert (sig_type->signature == signature); 4519 gdb_assert (sig_type->type_offset_in_tu.cu_off 4520 == type_offset_in_tu.cu_off); 4521 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off); 4522 4523 /* LENGTH has not been set yet for type units if we're 4524 using .gdb_index. */ 4525 this_cu->length = get_cu_length (&cu->header); 4526 4527 /* Establish the type offset that can be used to lookup the type. */ 4528 sig_type->type_offset_in_section.sect_off = 4529 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off; 4530 } 4531 else 4532 { 4533 info_ptr = read_and_check_comp_unit_head (&cu->header, section, 4534 abbrev_section, 4535 info_ptr, 0); 4536 4537 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off); 4538 gdb_assert (this_cu->length == get_cu_length (&cu->header)); 4539 } 4540 } 4541 4542 /* Skip dummy compilation units. */ 4543 if (info_ptr >= begin_info_ptr + this_cu->length 4544 || peek_abbrev_code (abfd, info_ptr) == 0) 4545 { 4546 do_cleanups (cleanups); 4547 return; 4548 } 4549 4550 /* If we don't have them yet, read the abbrevs for this compilation unit. 4551 And if we need to read them now, make sure they're freed when we're 4552 done. Note that it's important that if the CU had an abbrev table 4553 on entry we don't free it when we're done: Somewhere up the call stack 4554 it may be in use. */ 4555 if (abbrev_table != NULL) 4556 { 4557 gdb_assert (cu->abbrev_table == NULL); 4558 gdb_assert (cu->header.abbrev_offset.sect_off 4559 == abbrev_table->offset.sect_off); 4560 cu->abbrev_table = abbrev_table; 4561 } 4562 else if (cu->abbrev_table == NULL) 4563 { 4564 dwarf2_read_abbrevs (cu, abbrev_section); 4565 make_cleanup (dwarf2_free_abbrev_table, cu); 4566 } 4567 else if (rereading_dwo_cu) 4568 { 4569 dwarf2_free_abbrev_table (cu); 4570 dwarf2_read_abbrevs (cu, abbrev_section); 4571 } 4572 4573 /* Read the top level CU/TU die. */ 4574 init_cu_die_reader (&reader, cu, section, NULL); 4575 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children); 4576 4577 /* If we have a DWO stub, process it and then read in the DWO file. 4578 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains 4579 a DWO CU, that this test will fail. */ 4580 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu); 4581 if (attr) 4582 { 4583 const char *dwo_name = DW_STRING (attr); 4584 const char *comp_dir_string; 4585 struct dwo_unit *dwo_unit; 4586 ULONGEST signature; /* Or dwo_id. */ 4587 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges; 4588 int i,num_extra_attrs; 4589 struct dwarf2_section_info *dwo_abbrev_section; 4590 4591 if (has_children) 4592 error (_("Dwarf Error: compilation unit with DW_AT_GNU_dwo_name" 4593 " has children (offset 0x%x) [in module %s]"), 4594 this_cu->offset.sect_off, bfd_get_filename (abfd)); 4595 4596 /* These attributes aren't processed until later: 4597 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges. 4598 However, the attribute is found in the stub which we won't have later. 4599 In order to not impose this complication on the rest of the code, 4600 we read them here and copy them to the DWO CU/TU die. */ 4601 4602 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the 4603 DWO file. */ 4604 stmt_list = NULL; 4605 if (! this_cu->is_debug_types) 4606 stmt_list = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu); 4607 low_pc = dwarf2_attr (comp_unit_die, DW_AT_low_pc, cu); 4608 high_pc = dwarf2_attr (comp_unit_die, DW_AT_high_pc, cu); 4609 ranges = dwarf2_attr (comp_unit_die, DW_AT_ranges, cu); 4610 comp_dir = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu); 4611 4612 /* There should be a DW_AT_addr_base attribute here (if needed). 4613 We need the value before we can process DW_FORM_GNU_addr_index. */ 4614 cu->addr_base = 0; 4615 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_addr_base, cu); 4616 if (attr) 4617 cu->addr_base = DW_UNSND (attr); 4618 4619 /* There should be a DW_AT_ranges_base attribute here (if needed). 4620 We need the value before we can process DW_AT_ranges. */ 4621 cu->ranges_base = 0; 4622 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_ranges_base, cu); 4623 if (attr) 4624 cu->ranges_base = DW_UNSND (attr); 4625 4626 if (this_cu->is_debug_types) 4627 { 4628 gdb_assert (sig_type != NULL); 4629 signature = sig_type->signature; 4630 } 4631 else 4632 { 4633 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu); 4634 if (! attr) 4635 error (_("Dwarf Error: missing dwo_id [in module %s]"), 4636 dwo_name); 4637 signature = DW_UNSND (attr); 4638 } 4639 4640 /* We may need the comp_dir in order to find the DWO file. */ 4641 comp_dir_string = NULL; 4642 if (comp_dir) 4643 comp_dir_string = DW_STRING (comp_dir); 4644 4645 if (this_cu->is_debug_types) 4646 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir_string); 4647 else 4648 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir_string, 4649 signature); 4650 4651 if (dwo_unit == NULL) 4652 { 4653 error (_("Dwarf Error: CU at offset 0x%x references unknown DWO" 4654 " with ID %s [in module %s]"), 4655 this_cu->offset.sect_off, 4656 phex (signature, sizeof (signature)), 4657 objfile->name); 4658 } 4659 4660 /* Set up for reading the DWO CU/TU. */ 4661 cu->dwo_unit = dwo_unit; 4662 section = dwo_unit->info_or_types_section; 4663 dwarf2_read_section (objfile, section); 4664 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off; 4665 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev; 4666 init_cu_die_reader (&reader, cu, section, dwo_unit->dwo_file); 4667 4668 if (this_cu->is_debug_types) 4669 { 4670 ULONGEST signature; 4671 cu_offset type_offset_in_tu; 4672 4673 info_ptr = read_and_check_type_unit_head (&cu->header, section, 4674 dwo_abbrev_section, 4675 info_ptr, 4676 &signature, 4677 &type_offset_in_tu); 4678 gdb_assert (sig_type->signature == signature); 4679 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off); 4680 /* For DWOs coming from DWP files, we don't know the CU length 4681 nor the type's offset in the TU until now. */ 4682 dwo_unit->length = get_cu_length (&cu->header); 4683 dwo_unit->type_offset_in_tu = type_offset_in_tu; 4684 4685 /* Establish the type offset that can be used to lookup the type. 4686 For DWO files, we don't know it until now. */ 4687 sig_type->type_offset_in_section.sect_off = 4688 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off; 4689 } 4690 else 4691 { 4692 info_ptr = read_and_check_comp_unit_head (&cu->header, section, 4693 dwo_abbrev_section, 4694 info_ptr, 0); 4695 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off); 4696 /* For DWOs coming from DWP files, we don't know the CU length 4697 until now. */ 4698 dwo_unit->length = get_cu_length (&cu->header); 4699 } 4700 4701 /* Discard the original CU's abbrev table, and read the DWO's. */ 4702 if (abbrev_table == NULL) 4703 { 4704 dwarf2_free_abbrev_table (cu); 4705 dwarf2_read_abbrevs (cu, dwo_abbrev_section); 4706 } 4707 else 4708 { 4709 dwarf2_read_abbrevs (cu, dwo_abbrev_section); 4710 make_cleanup (dwarf2_free_abbrev_table, cu); 4711 } 4712 4713 /* Read in the die, but leave space to copy over the attributes 4714 from the stub. This has the benefit of simplifying the rest of 4715 the code - all the real work is done here. */ 4716 num_extra_attrs = ((stmt_list != NULL) 4717 + (low_pc != NULL) 4718 + (high_pc != NULL) 4719 + (ranges != NULL) 4720 + (comp_dir != NULL)); 4721 info_ptr = read_full_die_1 (&reader, &comp_unit_die, info_ptr, 4722 &has_children, num_extra_attrs); 4723 4724 /* Copy over the attributes from the stub to the DWO die. */ 4725 i = comp_unit_die->num_attrs; 4726 if (stmt_list != NULL) 4727 comp_unit_die->attrs[i++] = *stmt_list; 4728 if (low_pc != NULL) 4729 comp_unit_die->attrs[i++] = *low_pc; 4730 if (high_pc != NULL) 4731 comp_unit_die->attrs[i++] = *high_pc; 4732 if (ranges != NULL) 4733 comp_unit_die->attrs[i++] = *ranges; 4734 if (comp_dir != NULL) 4735 comp_unit_die->attrs[i++] = *comp_dir; 4736 comp_unit_die->num_attrs += num_extra_attrs; 4737 4738 /* Skip dummy compilation units. */ 4739 if (info_ptr >= begin_info_ptr + dwo_unit->length 4740 || peek_abbrev_code (abfd, info_ptr) == 0) 4741 { 4742 do_cleanups (cleanups); 4743 return; 4744 } 4745 } 4746 4747 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data); 4748 4749 if (free_cu_cleanup != NULL) 4750 { 4751 if (keep) 4752 { 4753 /* We've successfully allocated this compilation unit. Let our 4754 caller clean it up when finished with it. */ 4755 discard_cleanups (free_cu_cleanup); 4756 4757 /* We can only discard free_cu_cleanup and all subsequent cleanups. 4758 So we have to manually free the abbrev table. */ 4759 dwarf2_free_abbrev_table (cu); 4760 4761 /* Link this CU into read_in_chain. */ 4762 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain; 4763 dwarf2_per_objfile->read_in_chain = this_cu; 4764 } 4765 else 4766 do_cleanups (free_cu_cleanup); 4767 } 4768 4769 do_cleanups (cleanups); 4770 } 4771 4772 /* Read CU/TU THIS_CU in section SECTION, 4773 but do not follow DW_AT_GNU_dwo_name if present. 4774 DWOP_FILE, if non-NULL, is the DWO/DWP file to read (the caller is assumed 4775 to have already done the lookup to find the DWO/DWP file). 4776 4777 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and 4778 THIS_CU->is_debug_types, but nothing else. 4779 4780 We fill in THIS_CU->length. 4781 4782 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental 4783 linker) then DIE_READER_FUNC will not get called. 4784 4785 THIS_CU->cu is always freed when done. 4786 This is done in order to not leave THIS_CU->cu in a state where we have 4787 to care whether it refers to the "main" CU or the DWO CU. */ 4788 4789 static void 4790 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu, 4791 struct dwarf2_section_info *abbrev_section, 4792 struct dwo_file *dwo_file, 4793 die_reader_func_ftype *die_reader_func, 4794 void *data) 4795 { 4796 struct objfile *objfile = dwarf2_per_objfile->objfile; 4797 struct dwarf2_section_info *section = this_cu->info_or_types_section; 4798 bfd *abfd = section->asection->owner; 4799 struct dwarf2_cu cu; 4800 gdb_byte *begin_info_ptr, *info_ptr; 4801 struct die_reader_specs reader; 4802 struct cleanup *cleanups; 4803 struct die_info *comp_unit_die; 4804 int has_children; 4805 4806 if (dwarf2_die_debug) 4807 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n", 4808 this_cu->is_debug_types ? "type" : "comp", 4809 this_cu->offset.sect_off); 4810 4811 gdb_assert (this_cu->cu == NULL); 4812 4813 /* This is cheap if the section is already read in. */ 4814 dwarf2_read_section (objfile, section); 4815 4816 init_one_comp_unit (&cu, this_cu); 4817 4818 cleanups = make_cleanup (free_stack_comp_unit, &cu); 4819 4820 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off; 4821 info_ptr = read_and_check_comp_unit_head (&cu.header, section, 4822 abbrev_section, info_ptr, 4823 this_cu->is_debug_types); 4824 4825 this_cu->length = get_cu_length (&cu.header); 4826 4827 /* Skip dummy compilation units. */ 4828 if (info_ptr >= begin_info_ptr + this_cu->length 4829 || peek_abbrev_code (abfd, info_ptr) == 0) 4830 { 4831 do_cleanups (cleanups); 4832 return; 4833 } 4834 4835 dwarf2_read_abbrevs (&cu, abbrev_section); 4836 make_cleanup (dwarf2_free_abbrev_table, &cu); 4837 4838 init_cu_die_reader (&reader, &cu, section, dwo_file); 4839 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children); 4840 4841 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data); 4842 4843 do_cleanups (cleanups); 4844 } 4845 4846 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and 4847 does not lookup the specified DWO file. 4848 This cannot be used to read DWO files. 4849 4850 THIS_CU->cu is always freed when done. 4851 This is done in order to not leave THIS_CU->cu in a state where we have 4852 to care whether it refers to the "main" CU or the DWO CU. 4853 We can revisit this if the data shows there's a performance issue. */ 4854 4855 static void 4856 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu, 4857 die_reader_func_ftype *die_reader_func, 4858 void *data) 4859 { 4860 init_cutu_and_read_dies_no_follow (this_cu, 4861 get_abbrev_section_for_cu (this_cu), 4862 NULL, 4863 die_reader_func, data); 4864 } 4865 4866 /* Create a psymtab named NAME and assign it to PER_CU. 4867 4868 The caller must fill in the following details: 4869 dirname, textlow, texthigh. */ 4870 4871 static struct partial_symtab * 4872 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name) 4873 { 4874 struct objfile *objfile = per_cu->objfile; 4875 struct partial_symtab *pst; 4876 4877 pst = start_psymtab_common (objfile, objfile->section_offsets, 4878 name, 0, 4879 objfile->global_psymbols.next, 4880 objfile->static_psymbols.next); 4881 4882 pst->psymtabs_addrmap_supported = 1; 4883 4884 /* This is the glue that links PST into GDB's symbol API. */ 4885 pst->read_symtab_private = per_cu; 4886 pst->read_symtab = dwarf2_read_symtab; 4887 per_cu->v.psymtab = pst; 4888 4889 return pst; 4890 } 4891 4892 /* die_reader_func for process_psymtab_comp_unit. */ 4893 4894 static void 4895 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader, 4896 gdb_byte *info_ptr, 4897 struct die_info *comp_unit_die, 4898 int has_children, 4899 void *data) 4900 { 4901 struct dwarf2_cu *cu = reader->cu; 4902 struct objfile *objfile = cu->objfile; 4903 struct dwarf2_per_cu_data *per_cu = cu->per_cu; 4904 struct attribute *attr; 4905 CORE_ADDR baseaddr; 4906 CORE_ADDR best_lowpc = 0, best_highpc = 0; 4907 struct partial_symtab *pst; 4908 int has_pc_info; 4909 const char *filename; 4910 int *want_partial_unit_ptr = data; 4911 4912 if (comp_unit_die->tag == DW_TAG_partial_unit 4913 && (want_partial_unit_ptr == NULL 4914 || !*want_partial_unit_ptr)) 4915 return; 4916 4917 gdb_assert (! per_cu->is_debug_types); 4918 4919 prepare_one_comp_unit (cu, comp_unit_die, language_minimal); 4920 4921 cu->list_in_scope = &file_symbols; 4922 4923 /* Allocate a new partial symbol table structure. */ 4924 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu); 4925 if (attr == NULL || !DW_STRING (attr)) 4926 filename = ""; 4927 else 4928 filename = DW_STRING (attr); 4929 4930 pst = create_partial_symtab (per_cu, filename); 4931 4932 /* This must be done before calling dwarf2_build_include_psymtabs. */ 4933 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu); 4934 if (attr != NULL) 4935 pst->dirname = DW_STRING (attr); 4936 4937 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 4938 4939 dwarf2_find_base_address (comp_unit_die, cu); 4940 4941 /* Possibly set the default values of LOWPC and HIGHPC from 4942 `DW_AT_ranges'. */ 4943 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc, 4944 &best_highpc, cu, pst); 4945 if (has_pc_info == 1 && best_lowpc < best_highpc) 4946 /* Store the contiguous range if it is not empty; it can be empty for 4947 CUs with no code. */ 4948 addrmap_set_empty (objfile->psymtabs_addrmap, 4949 best_lowpc + baseaddr, 4950 best_highpc + baseaddr - 1, pst); 4951 4952 /* Check if comp unit has_children. 4953 If so, read the rest of the partial symbols from this comp unit. 4954 If not, there's no more debug_info for this comp unit. */ 4955 if (has_children) 4956 { 4957 struct partial_die_info *first_die; 4958 CORE_ADDR lowpc, highpc; 4959 4960 lowpc = ((CORE_ADDR) -1); 4961 highpc = ((CORE_ADDR) 0); 4962 4963 first_die = load_partial_dies (reader, info_ptr, 1); 4964 4965 scan_partial_symbols (first_die, &lowpc, &highpc, 4966 ! has_pc_info, cu); 4967 4968 /* If we didn't find a lowpc, set it to highpc to avoid 4969 complaints from `maint check'. */ 4970 if (lowpc == ((CORE_ADDR) -1)) 4971 lowpc = highpc; 4972 4973 /* If the compilation unit didn't have an explicit address range, 4974 then use the information extracted from its child dies. */ 4975 if (! has_pc_info) 4976 { 4977 best_lowpc = lowpc; 4978 best_highpc = highpc; 4979 } 4980 } 4981 pst->textlow = best_lowpc + baseaddr; 4982 pst->texthigh = best_highpc + baseaddr; 4983 4984 pst->n_global_syms = objfile->global_psymbols.next - 4985 (objfile->global_psymbols.list + pst->globals_offset); 4986 pst->n_static_syms = objfile->static_psymbols.next - 4987 (objfile->static_psymbols.list + pst->statics_offset); 4988 sort_pst_symbols (objfile, pst); 4989 4990 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs)) 4991 { 4992 int i; 4993 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs); 4994 struct dwarf2_per_cu_data *iter; 4995 4996 /* Fill in 'dependencies' here; we fill in 'users' in a 4997 post-pass. */ 4998 pst->number_of_dependencies = len; 4999 pst->dependencies = obstack_alloc (&objfile->objfile_obstack, 5000 len * sizeof (struct symtab *)); 5001 for (i = 0; 5002 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs, 5003 i, iter); 5004 ++i) 5005 pst->dependencies[i] = iter->v.psymtab; 5006 5007 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs); 5008 } 5009 5010 /* Get the list of files included in the current compilation unit, 5011 and build a psymtab for each of them. */ 5012 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst); 5013 5014 if (dwarf2_read_debug) 5015 { 5016 struct gdbarch *gdbarch = get_objfile_arch (objfile); 5017 5018 fprintf_unfiltered (gdb_stdlog, 5019 "Psymtab for %s unit @0x%x: %s - %s" 5020 ", %d global, %d static syms\n", 5021 per_cu->is_debug_types ? "type" : "comp", 5022 per_cu->offset.sect_off, 5023 paddress (gdbarch, pst->textlow), 5024 paddress (gdbarch, pst->texthigh), 5025 pst->n_global_syms, pst->n_static_syms); 5026 } 5027 } 5028 5029 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it. 5030 Process compilation unit THIS_CU for a psymtab. */ 5031 5032 static void 5033 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu, 5034 int want_partial_unit) 5035 { 5036 /* If this compilation unit was already read in, free the 5037 cached copy in order to read it in again. This is 5038 necessary because we skipped some symbols when we first 5039 read in the compilation unit (see load_partial_dies). 5040 This problem could be avoided, but the benefit is unclear. */ 5041 if (this_cu->cu != NULL) 5042 free_one_cached_comp_unit (this_cu); 5043 5044 gdb_assert (! this_cu->is_debug_types); 5045 init_cutu_and_read_dies (this_cu, NULL, 0, 0, 5046 process_psymtab_comp_unit_reader, 5047 &want_partial_unit); 5048 5049 /* Age out any secondary CUs. */ 5050 age_cached_comp_units (); 5051 } 5052 5053 static hashval_t 5054 hash_type_unit_group (const void *item) 5055 { 5056 const struct type_unit_group *tu_group = item; 5057 5058 return hash_stmt_list_entry (&tu_group->hash); 5059 } 5060 5061 static int 5062 eq_type_unit_group (const void *item_lhs, const void *item_rhs) 5063 { 5064 const struct type_unit_group *lhs = item_lhs; 5065 const struct type_unit_group *rhs = item_rhs; 5066 5067 return eq_stmt_list_entry (&lhs->hash, &rhs->hash); 5068 } 5069 5070 /* Allocate a hash table for type unit groups. */ 5071 5072 static htab_t 5073 allocate_type_unit_groups_table (void) 5074 { 5075 return htab_create_alloc_ex (3, 5076 hash_type_unit_group, 5077 eq_type_unit_group, 5078 NULL, 5079 &dwarf2_per_objfile->objfile->objfile_obstack, 5080 hashtab_obstack_allocate, 5081 dummy_obstack_deallocate); 5082 } 5083 5084 /* Type units that don't have DW_AT_stmt_list are grouped into their own 5085 partial symtabs. We combine several TUs per psymtab to not let the size 5086 of any one psymtab grow too big. */ 5087 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31) 5088 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10 5089 5090 /* Helper routine for get_type_unit_group. 5091 Create the type_unit_group object used to hold one or more TUs. */ 5092 5093 static struct type_unit_group * 5094 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct) 5095 { 5096 struct objfile *objfile = dwarf2_per_objfile->objfile; 5097 struct dwarf2_per_cu_data *per_cu; 5098 struct type_unit_group *tu_group; 5099 5100 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack, 5101 struct type_unit_group); 5102 per_cu = &tu_group->per_cu; 5103 per_cu->objfile = objfile; 5104 per_cu->is_debug_types = 1; 5105 per_cu->type_unit_group = tu_group; 5106 5107 if (dwarf2_per_objfile->using_index) 5108 { 5109 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack, 5110 struct dwarf2_per_cu_quick_data); 5111 tu_group->t.first_tu = cu->per_cu; 5112 } 5113 else 5114 { 5115 unsigned int line_offset = line_offset_struct.sect_off; 5116 struct partial_symtab *pst; 5117 char *name; 5118 5119 /* Give the symtab a useful name for debug purposes. */ 5120 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0) 5121 name = xstrprintf ("<type_units_%d>", 5122 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB)); 5123 else 5124 name = xstrprintf ("<type_units_at_0x%x>", line_offset); 5125 5126 pst = create_partial_symtab (per_cu, name); 5127 pst->anonymous = 1; 5128 5129 xfree (name); 5130 } 5131 5132 tu_group->hash.dwo_unit = cu->dwo_unit; 5133 tu_group->hash.line_offset = line_offset_struct; 5134 5135 return tu_group; 5136 } 5137 5138 /* Look up the type_unit_group for type unit CU, and create it if necessary. 5139 STMT_LIST is a DW_AT_stmt_list attribute. */ 5140 5141 static struct type_unit_group * 5142 get_type_unit_group (struct dwarf2_cu *cu, struct attribute *stmt_list) 5143 { 5144 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats; 5145 struct type_unit_group *tu_group; 5146 void **slot; 5147 unsigned int line_offset; 5148 struct type_unit_group type_unit_group_for_lookup; 5149 5150 if (dwarf2_per_objfile->type_unit_groups == NULL) 5151 { 5152 dwarf2_per_objfile->type_unit_groups = 5153 allocate_type_unit_groups_table (); 5154 } 5155 5156 /* Do we need to create a new group, or can we use an existing one? */ 5157 5158 if (stmt_list) 5159 { 5160 line_offset = DW_UNSND (stmt_list); 5161 ++tu_stats->nr_symtab_sharers; 5162 } 5163 else 5164 { 5165 /* Ugh, no stmt_list. Rare, but we have to handle it. 5166 We can do various things here like create one group per TU or 5167 spread them over multiple groups to split up the expansion work. 5168 To avoid worst case scenarios (too many groups or too large groups) 5169 we, umm, group them in bunches. */ 5170 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB 5171 | (tu_stats->nr_stmt_less_type_units 5172 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE)); 5173 ++tu_stats->nr_stmt_less_type_units; 5174 } 5175 5176 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit; 5177 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset; 5178 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups, 5179 &type_unit_group_for_lookup, INSERT); 5180 if (*slot != NULL) 5181 { 5182 tu_group = *slot; 5183 gdb_assert (tu_group != NULL); 5184 } 5185 else 5186 { 5187 sect_offset line_offset_struct; 5188 5189 line_offset_struct.sect_off = line_offset; 5190 tu_group = create_type_unit_group (cu, line_offset_struct); 5191 *slot = tu_group; 5192 ++tu_stats->nr_symtabs; 5193 } 5194 5195 return tu_group; 5196 } 5197 5198 /* Struct used to sort TUs by their abbreviation table offset. */ 5199 5200 struct tu_abbrev_offset 5201 { 5202 struct signatured_type *sig_type; 5203 sect_offset abbrev_offset; 5204 }; 5205 5206 /* Helper routine for build_type_unit_groups, passed to qsort. */ 5207 5208 static int 5209 sort_tu_by_abbrev_offset (const void *ap, const void *bp) 5210 { 5211 const struct tu_abbrev_offset * const *a = ap; 5212 const struct tu_abbrev_offset * const *b = bp; 5213 unsigned int aoff = (*a)->abbrev_offset.sect_off; 5214 unsigned int boff = (*b)->abbrev_offset.sect_off; 5215 5216 return (aoff > boff) - (aoff < boff); 5217 } 5218 5219 /* A helper function to add a type_unit_group to a table. */ 5220 5221 static int 5222 add_type_unit_group_to_table (void **slot, void *datum) 5223 { 5224 struct type_unit_group *tu_group = *slot; 5225 struct type_unit_group ***datap = datum; 5226 5227 **datap = tu_group; 5228 ++*datap; 5229 5230 return 1; 5231 } 5232 5233 /* Efficiently read all the type units, calling init_cutu_and_read_dies on 5234 each one passing FUNC,DATA. 5235 5236 The efficiency is because we sort TUs by the abbrev table they use and 5237 only read each abbrev table once. In one program there are 200K TUs 5238 sharing 8K abbrev tables. 5239 5240 The main purpose of this function is to support building the 5241 dwarf2_per_objfile->type_unit_groups table. 5242 TUs typically share the DW_AT_stmt_list of the CU they came from, so we 5243 can collapse the search space by grouping them by stmt_list. 5244 The savings can be significant, in the same program from above the 200K TUs 5245 share 8K stmt_list tables. 5246 5247 FUNC is expected to call get_type_unit_group, which will create the 5248 struct type_unit_group if necessary and add it to 5249 dwarf2_per_objfile->type_unit_groups. */ 5250 5251 static void 5252 build_type_unit_groups (die_reader_func_ftype *func, void *data) 5253 { 5254 struct objfile *objfile = dwarf2_per_objfile->objfile; 5255 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats; 5256 struct cleanup *cleanups; 5257 struct abbrev_table *abbrev_table; 5258 sect_offset abbrev_offset; 5259 struct tu_abbrev_offset *sorted_by_abbrev; 5260 struct type_unit_group **iter; 5261 int i; 5262 5263 /* It's up to the caller to not call us multiple times. */ 5264 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL); 5265 5266 if (dwarf2_per_objfile->n_type_units == 0) 5267 return; 5268 5269 /* TUs typically share abbrev tables, and there can be way more TUs than 5270 abbrev tables. Sort by abbrev table to reduce the number of times we 5271 read each abbrev table in. 5272 Alternatives are to punt or to maintain a cache of abbrev tables. 5273 This is simpler and efficient enough for now. 5274 5275 Later we group TUs by their DW_AT_stmt_list value (as this defines the 5276 symtab to use). Typically TUs with the same abbrev offset have the same 5277 stmt_list value too so in practice this should work well. 5278 5279 The basic algorithm here is: 5280 5281 sort TUs by abbrev table 5282 for each TU with same abbrev table: 5283 read abbrev table if first user 5284 read TU top level DIE 5285 [IWBN if DWO skeletons had DW_AT_stmt_list] 5286 call FUNC */ 5287 5288 if (dwarf2_read_debug) 5289 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n"); 5290 5291 /* Sort in a separate table to maintain the order of all_type_units 5292 for .gdb_index: TU indices directly index all_type_units. */ 5293 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset, 5294 dwarf2_per_objfile->n_type_units); 5295 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i) 5296 { 5297 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i]; 5298 5299 sorted_by_abbrev[i].sig_type = sig_type; 5300 sorted_by_abbrev[i].abbrev_offset = 5301 read_abbrev_offset (sig_type->per_cu.info_or_types_section, 5302 sig_type->per_cu.offset); 5303 } 5304 cleanups = make_cleanup (xfree, sorted_by_abbrev); 5305 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units, 5306 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset); 5307 5308 /* Note: In the .gdb_index case, get_type_unit_group may have already been 5309 called any number of times, so we don't reset tu_stats here. */ 5310 5311 abbrev_offset.sect_off = ~(unsigned) 0; 5312 abbrev_table = NULL; 5313 make_cleanup (abbrev_table_free_cleanup, &abbrev_table); 5314 5315 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i) 5316 { 5317 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i]; 5318 5319 /* Switch to the next abbrev table if necessary. */ 5320 if (abbrev_table == NULL 5321 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off) 5322 { 5323 if (abbrev_table != NULL) 5324 { 5325 abbrev_table_free (abbrev_table); 5326 /* Reset to NULL in case abbrev_table_read_table throws 5327 an error: abbrev_table_free_cleanup will get called. */ 5328 abbrev_table = NULL; 5329 } 5330 abbrev_offset = tu->abbrev_offset; 5331 abbrev_table = 5332 abbrev_table_read_table (&dwarf2_per_objfile->abbrev, 5333 abbrev_offset); 5334 ++tu_stats->nr_uniq_abbrev_tables; 5335 } 5336 5337 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0, 5338 func, data); 5339 } 5340 5341 /* Create a vector of pointers to primary type units to make it easy to 5342 iterate over them and CUs. See dw2_get_primary_cu. */ 5343 dwarf2_per_objfile->n_type_unit_groups = 5344 htab_elements (dwarf2_per_objfile->type_unit_groups); 5345 dwarf2_per_objfile->all_type_unit_groups = 5346 obstack_alloc (&objfile->objfile_obstack, 5347 dwarf2_per_objfile->n_type_unit_groups 5348 * sizeof (struct type_unit_group *)); 5349 iter = &dwarf2_per_objfile->all_type_unit_groups[0]; 5350 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups, 5351 add_type_unit_group_to_table, &iter); 5352 gdb_assert (iter - &dwarf2_per_objfile->all_type_unit_groups[0] 5353 == dwarf2_per_objfile->n_type_unit_groups); 5354 5355 do_cleanups (cleanups); 5356 5357 if (dwarf2_read_debug) 5358 { 5359 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n"); 5360 fprintf_unfiltered (gdb_stdlog, " %d TUs\n", 5361 dwarf2_per_objfile->n_type_units); 5362 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n", 5363 tu_stats->nr_uniq_abbrev_tables); 5364 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n", 5365 tu_stats->nr_symtabs); 5366 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n", 5367 tu_stats->nr_symtab_sharers); 5368 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n", 5369 tu_stats->nr_stmt_less_type_units); 5370 } 5371 } 5372 5373 /* Reader function for build_type_psymtabs. */ 5374 5375 static void 5376 build_type_psymtabs_reader (const struct die_reader_specs *reader, 5377 gdb_byte *info_ptr, 5378 struct die_info *type_unit_die, 5379 int has_children, 5380 void *data) 5381 { 5382 struct objfile *objfile = dwarf2_per_objfile->objfile; 5383 struct dwarf2_cu *cu = reader->cu; 5384 struct dwarf2_per_cu_data *per_cu = cu->per_cu; 5385 struct type_unit_group *tu_group; 5386 struct attribute *attr; 5387 struct partial_die_info *first_die; 5388 CORE_ADDR lowpc, highpc; 5389 struct partial_symtab *pst; 5390 5391 gdb_assert (data == NULL); 5392 5393 if (! has_children) 5394 return; 5395 5396 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list); 5397 tu_group = get_type_unit_group (cu, attr); 5398 5399 VEC_safe_push (dwarf2_per_cu_ptr, tu_group->t.tus, per_cu); 5400 5401 prepare_one_comp_unit (cu, type_unit_die, language_minimal); 5402 cu->list_in_scope = &file_symbols; 5403 pst = create_partial_symtab (per_cu, ""); 5404 pst->anonymous = 1; 5405 5406 first_die = load_partial_dies (reader, info_ptr, 1); 5407 5408 lowpc = (CORE_ADDR) -1; 5409 highpc = (CORE_ADDR) 0; 5410 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu); 5411 5412 pst->n_global_syms = objfile->global_psymbols.next - 5413 (objfile->global_psymbols.list + pst->globals_offset); 5414 pst->n_static_syms = objfile->static_psymbols.next - 5415 (objfile->static_psymbols.list + pst->statics_offset); 5416 sort_pst_symbols (objfile, pst); 5417 } 5418 5419 /* Traversal function for build_type_psymtabs. */ 5420 5421 static int 5422 build_type_psymtab_dependencies (void **slot, void *info) 5423 { 5424 struct objfile *objfile = dwarf2_per_objfile->objfile; 5425 struct type_unit_group *tu_group = (struct type_unit_group *) *slot; 5426 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu; 5427 struct partial_symtab *pst = per_cu->v.psymtab; 5428 int len = VEC_length (dwarf2_per_cu_ptr, tu_group->t.tus); 5429 struct dwarf2_per_cu_data *iter; 5430 int i; 5431 5432 gdb_assert (len > 0); 5433 5434 pst->number_of_dependencies = len; 5435 pst->dependencies = obstack_alloc (&objfile->objfile_obstack, 5436 len * sizeof (struct psymtab *)); 5437 for (i = 0; 5438 VEC_iterate (dwarf2_per_cu_ptr, tu_group->t.tus, i, iter); 5439 ++i) 5440 { 5441 pst->dependencies[i] = iter->v.psymtab; 5442 iter->type_unit_group = tu_group; 5443 } 5444 5445 VEC_free (dwarf2_per_cu_ptr, tu_group->t.tus); 5446 5447 return 1; 5448 } 5449 5450 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it. 5451 Build partial symbol tables for the .debug_types comp-units. */ 5452 5453 static void 5454 build_type_psymtabs (struct objfile *objfile) 5455 { 5456 if (! create_all_type_units (objfile)) 5457 return; 5458 5459 build_type_unit_groups (build_type_psymtabs_reader, NULL); 5460 5461 /* Now that all TUs have been processed we can fill in the dependencies. */ 5462 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups, 5463 build_type_psymtab_dependencies, NULL); 5464 } 5465 5466 /* A cleanup function that clears objfile's psymtabs_addrmap field. */ 5467 5468 static void 5469 psymtabs_addrmap_cleanup (void *o) 5470 { 5471 struct objfile *objfile = o; 5472 5473 objfile->psymtabs_addrmap = NULL; 5474 } 5475 5476 /* Compute the 'user' field for each psymtab in OBJFILE. */ 5477 5478 static void 5479 set_partial_user (struct objfile *objfile) 5480 { 5481 int i; 5482 5483 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) 5484 { 5485 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); 5486 struct partial_symtab *pst = per_cu->v.psymtab; 5487 int j; 5488 5489 if (pst == NULL) 5490 continue; 5491 5492 for (j = 0; j < pst->number_of_dependencies; ++j) 5493 { 5494 /* Set the 'user' field only if it is not already set. */ 5495 if (pst->dependencies[j]->user == NULL) 5496 pst->dependencies[j]->user = pst; 5497 } 5498 } 5499 } 5500 5501 /* Build the partial symbol table by doing a quick pass through the 5502 .debug_info and .debug_abbrev sections. */ 5503 5504 static void 5505 dwarf2_build_psymtabs_hard (struct objfile *objfile) 5506 { 5507 struct cleanup *back_to, *addrmap_cleanup; 5508 struct obstack temp_obstack; 5509 int i; 5510 5511 if (dwarf2_read_debug) 5512 { 5513 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n", 5514 objfile->name); 5515 } 5516 5517 dwarf2_per_objfile->reading_partial_symbols = 1; 5518 5519 dwarf2_read_section (objfile, &dwarf2_per_objfile->info); 5520 5521 /* Any cached compilation units will be linked by the per-objfile 5522 read_in_chain. Make sure to free them when we're done. */ 5523 back_to = make_cleanup (free_cached_comp_units, NULL); 5524 5525 build_type_psymtabs (objfile); 5526 5527 create_all_comp_units (objfile); 5528 5529 /* Create a temporary address map on a temporary obstack. We later 5530 copy this to the final obstack. */ 5531 obstack_init (&temp_obstack); 5532 make_cleanup_obstack_free (&temp_obstack); 5533 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack); 5534 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile); 5535 5536 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) 5537 { 5538 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); 5539 5540 process_psymtab_comp_unit (per_cu, 0); 5541 } 5542 5543 set_partial_user (objfile); 5544 5545 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap, 5546 &objfile->objfile_obstack); 5547 discard_cleanups (addrmap_cleanup); 5548 5549 do_cleanups (back_to); 5550 5551 if (dwarf2_read_debug) 5552 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n", 5553 objfile->name); 5554 } 5555 5556 /* die_reader_func for load_partial_comp_unit. */ 5557 5558 static void 5559 load_partial_comp_unit_reader (const struct die_reader_specs *reader, 5560 gdb_byte *info_ptr, 5561 struct die_info *comp_unit_die, 5562 int has_children, 5563 void *data) 5564 { 5565 struct dwarf2_cu *cu = reader->cu; 5566 5567 prepare_one_comp_unit (cu, comp_unit_die, language_minimal); 5568 5569 /* Check if comp unit has_children. 5570 If so, read the rest of the partial symbols from this comp unit. 5571 If not, there's no more debug_info for this comp unit. */ 5572 if (has_children) 5573 load_partial_dies (reader, info_ptr, 0); 5574 } 5575 5576 /* Load the partial DIEs for a secondary CU into memory. 5577 This is also used when rereading a primary CU with load_all_dies. */ 5578 5579 static void 5580 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu) 5581 { 5582 init_cutu_and_read_dies (this_cu, NULL, 1, 1, 5583 load_partial_comp_unit_reader, NULL); 5584 } 5585 5586 static void 5587 read_comp_units_from_section (struct objfile *objfile, 5588 struct dwarf2_section_info *section, 5589 unsigned int is_dwz, 5590 int *n_allocated, 5591 int *n_comp_units, 5592 struct dwarf2_per_cu_data ***all_comp_units) 5593 { 5594 gdb_byte *info_ptr; 5595 bfd *abfd = section->asection->owner; 5596 5597 dwarf2_read_section (objfile, section); 5598 5599 info_ptr = section->buffer; 5600 5601 while (info_ptr < section->buffer + section->size) 5602 { 5603 unsigned int length, initial_length_size; 5604 struct dwarf2_per_cu_data *this_cu; 5605 sect_offset offset; 5606 5607 offset.sect_off = info_ptr - section->buffer; 5608 5609 /* Read just enough information to find out where the next 5610 compilation unit is. */ 5611 length = read_initial_length (abfd, info_ptr, &initial_length_size); 5612 5613 /* Save the compilation unit for later lookup. */ 5614 this_cu = obstack_alloc (&objfile->objfile_obstack, 5615 sizeof (struct dwarf2_per_cu_data)); 5616 memset (this_cu, 0, sizeof (*this_cu)); 5617 this_cu->offset = offset; 5618 this_cu->length = length + initial_length_size; 5619 this_cu->is_dwz = is_dwz; 5620 this_cu->objfile = objfile; 5621 this_cu->info_or_types_section = section; 5622 5623 if (*n_comp_units == *n_allocated) 5624 { 5625 *n_allocated *= 2; 5626 *all_comp_units = xrealloc (*all_comp_units, 5627 *n_allocated 5628 * sizeof (struct dwarf2_per_cu_data *)); 5629 } 5630 (*all_comp_units)[*n_comp_units] = this_cu; 5631 ++*n_comp_units; 5632 5633 info_ptr = info_ptr + this_cu->length; 5634 } 5635 } 5636 5637 /* Create a list of all compilation units in OBJFILE. 5638 This is only done for -readnow and building partial symtabs. */ 5639 5640 static void 5641 create_all_comp_units (struct objfile *objfile) 5642 { 5643 int n_allocated; 5644 int n_comp_units; 5645 struct dwarf2_per_cu_data **all_comp_units; 5646 5647 n_comp_units = 0; 5648 n_allocated = 10; 5649 all_comp_units = xmalloc (n_allocated 5650 * sizeof (struct dwarf2_per_cu_data *)); 5651 5652 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0, 5653 &n_allocated, &n_comp_units, &all_comp_units); 5654 5655 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL) 5656 { 5657 struct dwz_file *dwz = dwarf2_get_dwz_file (); 5658 5659 read_comp_units_from_section (objfile, &dwz->info, 1, 5660 &n_allocated, &n_comp_units, 5661 &all_comp_units); 5662 } 5663 5664 dwarf2_per_objfile->all_comp_units 5665 = obstack_alloc (&objfile->objfile_obstack, 5666 n_comp_units * sizeof (struct dwarf2_per_cu_data *)); 5667 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units, 5668 n_comp_units * sizeof (struct dwarf2_per_cu_data *)); 5669 xfree (all_comp_units); 5670 dwarf2_per_objfile->n_comp_units = n_comp_units; 5671 } 5672 5673 /* Process all loaded DIEs for compilation unit CU, starting at 5674 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation 5675 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or 5676 DW_AT_ranges). If NEED_PC is set, then this function will set 5677 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU 5678 and record the covered ranges in the addrmap. */ 5679 5680 static void 5681 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc, 5682 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu) 5683 { 5684 struct partial_die_info *pdi; 5685 5686 /* Now, march along the PDI's, descending into ones which have 5687 interesting children but skipping the children of the other ones, 5688 until we reach the end of the compilation unit. */ 5689 5690 pdi = first_die; 5691 5692 while (pdi != NULL) 5693 { 5694 fixup_partial_die (pdi, cu); 5695 5696 /* Anonymous namespaces or modules have no name but have interesting 5697 children, so we need to look at them. Ditto for anonymous 5698 enums. */ 5699 5700 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace 5701 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type 5702 || pdi->tag == DW_TAG_imported_unit) 5703 { 5704 switch (pdi->tag) 5705 { 5706 case DW_TAG_subprogram: 5707 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu); 5708 break; 5709 case DW_TAG_constant: 5710 case DW_TAG_variable: 5711 case DW_TAG_typedef: 5712 case DW_TAG_union_type: 5713 if (!pdi->is_declaration) 5714 { 5715 add_partial_symbol (pdi, cu); 5716 } 5717 break; 5718 case DW_TAG_class_type: 5719 case DW_TAG_interface_type: 5720 case DW_TAG_structure_type: 5721 if (!pdi->is_declaration) 5722 { 5723 add_partial_symbol (pdi, cu); 5724 } 5725 break; 5726 case DW_TAG_enumeration_type: 5727 if (!pdi->is_declaration) 5728 add_partial_enumeration (pdi, cu); 5729 break; 5730 case DW_TAG_base_type: 5731 case DW_TAG_subrange_type: 5732 /* File scope base type definitions are added to the partial 5733 symbol table. */ 5734 add_partial_symbol (pdi, cu); 5735 break; 5736 case DW_TAG_namespace: 5737 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu); 5738 break; 5739 case DW_TAG_module: 5740 add_partial_module (pdi, lowpc, highpc, need_pc, cu); 5741 break; 5742 case DW_TAG_imported_unit: 5743 { 5744 struct dwarf2_per_cu_data *per_cu; 5745 5746 /* For now we don't handle imported units in type units. */ 5747 if (cu->per_cu->is_debug_types) 5748 { 5749 error (_("Dwarf Error: DW_TAG_imported_unit is not" 5750 " supported in type units [in module %s]"), 5751 cu->objfile->name); 5752 } 5753 5754 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset, 5755 pdi->is_dwz, 5756 cu->objfile); 5757 5758 /* Go read the partial unit, if needed. */ 5759 if (per_cu->v.psymtab == NULL) 5760 process_psymtab_comp_unit (per_cu, 1); 5761 5762 VEC_safe_push (dwarf2_per_cu_ptr, 5763 cu->per_cu->imported_symtabs, per_cu); 5764 } 5765 break; 5766 default: 5767 break; 5768 } 5769 } 5770 5771 /* If the die has a sibling, skip to the sibling. */ 5772 5773 pdi = pdi->die_sibling; 5774 } 5775 } 5776 5777 /* Functions used to compute the fully scoped name of a partial DIE. 5778 5779 Normally, this is simple. For C++, the parent DIE's fully scoped 5780 name is concatenated with "::" and the partial DIE's name. For 5781 Java, the same thing occurs except that "." is used instead of "::". 5782 Enumerators are an exception; they use the scope of their parent 5783 enumeration type, i.e. the name of the enumeration type is not 5784 prepended to the enumerator. 5785 5786 There are two complexities. One is DW_AT_specification; in this 5787 case "parent" means the parent of the target of the specification, 5788 instead of the direct parent of the DIE. The other is compilers 5789 which do not emit DW_TAG_namespace; in this case we try to guess 5790 the fully qualified name of structure types from their members' 5791 linkage names. This must be done using the DIE's children rather 5792 than the children of any DW_AT_specification target. We only need 5793 to do this for structures at the top level, i.e. if the target of 5794 any DW_AT_specification (if any; otherwise the DIE itself) does not 5795 have a parent. */ 5796 5797 /* Compute the scope prefix associated with PDI's parent, in 5798 compilation unit CU. The result will be allocated on CU's 5799 comp_unit_obstack, or a copy of the already allocated PDI->NAME 5800 field. NULL is returned if no prefix is necessary. */ 5801 static const char * 5802 partial_die_parent_scope (struct partial_die_info *pdi, 5803 struct dwarf2_cu *cu) 5804 { 5805 const char *grandparent_scope; 5806 struct partial_die_info *parent, *real_pdi; 5807 5808 /* We need to look at our parent DIE; if we have a DW_AT_specification, 5809 then this means the parent of the specification DIE. */ 5810 5811 real_pdi = pdi; 5812 while (real_pdi->has_specification) 5813 real_pdi = find_partial_die (real_pdi->spec_offset, 5814 real_pdi->spec_is_dwz, cu); 5815 5816 parent = real_pdi->die_parent; 5817 if (parent == NULL) 5818 return NULL; 5819 5820 if (parent->scope_set) 5821 return parent->scope; 5822 5823 fixup_partial_die (parent, cu); 5824 5825 grandparent_scope = partial_die_parent_scope (parent, cu); 5826 5827 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus 5828 DW_TAG_namespace DIEs with a name of "::" for the global namespace. 5829 Work around this problem here. */ 5830 if (cu->language == language_cplus 5831 && parent->tag == DW_TAG_namespace 5832 && strcmp (parent->name, "::") == 0 5833 && grandparent_scope == NULL) 5834 { 5835 parent->scope = NULL; 5836 parent->scope_set = 1; 5837 return NULL; 5838 } 5839 5840 if (pdi->tag == DW_TAG_enumerator) 5841 /* Enumerators should not get the name of the enumeration as a prefix. */ 5842 parent->scope = grandparent_scope; 5843 else if (parent->tag == DW_TAG_namespace 5844 || parent->tag == DW_TAG_module 5845 || parent->tag == DW_TAG_structure_type 5846 || parent->tag == DW_TAG_class_type 5847 || parent->tag == DW_TAG_interface_type 5848 || parent->tag == DW_TAG_union_type 5849 || parent->tag == DW_TAG_enumeration_type) 5850 { 5851 if (grandparent_scope == NULL) 5852 parent->scope = parent->name; 5853 else 5854 parent->scope = typename_concat (&cu->comp_unit_obstack, 5855 grandparent_scope, 5856 parent->name, 0, cu); 5857 } 5858 else 5859 { 5860 /* FIXME drow/2004-04-01: What should we be doing with 5861 function-local names? For partial symbols, we should probably be 5862 ignoring them. */ 5863 complaint (&symfile_complaints, 5864 _("unhandled containing DIE tag %d for DIE at %d"), 5865 parent->tag, pdi->offset.sect_off); 5866 parent->scope = grandparent_scope; 5867 } 5868 5869 parent->scope_set = 1; 5870 return parent->scope; 5871 } 5872 5873 /* Return the fully scoped name associated with PDI, from compilation unit 5874 CU. The result will be allocated with malloc. */ 5875 5876 static char * 5877 partial_die_full_name (struct partial_die_info *pdi, 5878 struct dwarf2_cu *cu) 5879 { 5880 const char *parent_scope; 5881 5882 /* If this is a template instantiation, we can not work out the 5883 template arguments from partial DIEs. So, unfortunately, we have 5884 to go through the full DIEs. At least any work we do building 5885 types here will be reused if full symbols are loaded later. */ 5886 if (pdi->has_template_arguments) 5887 { 5888 fixup_partial_die (pdi, cu); 5889 5890 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL) 5891 { 5892 struct die_info *die; 5893 struct attribute attr; 5894 struct dwarf2_cu *ref_cu = cu; 5895 5896 /* DW_FORM_ref_addr is using section offset. */ 5897 attr.name = 0; 5898 attr.form = DW_FORM_ref_addr; 5899 attr.u.unsnd = pdi->offset.sect_off; 5900 die = follow_die_ref (NULL, &attr, &ref_cu); 5901 5902 return xstrdup (dwarf2_full_name (NULL, die, ref_cu)); 5903 } 5904 } 5905 5906 parent_scope = partial_die_parent_scope (pdi, cu); 5907 if (parent_scope == NULL) 5908 return NULL; 5909 else 5910 return typename_concat (NULL, parent_scope, pdi->name, 0, cu); 5911 } 5912 5913 static void 5914 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu) 5915 { 5916 struct objfile *objfile = cu->objfile; 5917 CORE_ADDR addr = 0; 5918 const char *actual_name = NULL; 5919 CORE_ADDR baseaddr; 5920 char *built_actual_name; 5921 5922 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 5923 5924 built_actual_name = partial_die_full_name (pdi, cu); 5925 if (built_actual_name != NULL) 5926 actual_name = built_actual_name; 5927 5928 if (actual_name == NULL) 5929 actual_name = pdi->name; 5930 5931 switch (pdi->tag) 5932 { 5933 case DW_TAG_subprogram: 5934 if (pdi->is_external || cu->language == language_ada) 5935 { 5936 /* brobecker/2007-12-26: Normally, only "external" DIEs are part 5937 of the global scope. But in Ada, we want to be able to access 5938 nested procedures globally. So all Ada subprograms are stored 5939 in the global scope. */ 5940 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr, 5941 mst_text, objfile); */ 5942 add_psymbol_to_list (actual_name, strlen (actual_name), 5943 built_actual_name != NULL, 5944 VAR_DOMAIN, LOC_BLOCK, 5945 &objfile->global_psymbols, 5946 0, pdi->lowpc + baseaddr, 5947 cu->language, objfile); 5948 } 5949 else 5950 { 5951 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr, 5952 mst_file_text, objfile); */ 5953 add_psymbol_to_list (actual_name, strlen (actual_name), 5954 built_actual_name != NULL, 5955 VAR_DOMAIN, LOC_BLOCK, 5956 &objfile->static_psymbols, 5957 0, pdi->lowpc + baseaddr, 5958 cu->language, objfile); 5959 } 5960 break; 5961 case DW_TAG_constant: 5962 { 5963 struct psymbol_allocation_list *list; 5964 5965 if (pdi->is_external) 5966 list = &objfile->global_psymbols; 5967 else 5968 list = &objfile->static_psymbols; 5969 add_psymbol_to_list (actual_name, strlen (actual_name), 5970 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC, 5971 list, 0, 0, cu->language, objfile); 5972 } 5973 break; 5974 case DW_TAG_variable: 5975 if (pdi->d.locdesc) 5976 addr = decode_locdesc (pdi->d.locdesc, cu); 5977 5978 if (pdi->d.locdesc 5979 && addr == 0 5980 && !dwarf2_per_objfile->has_section_at_zero) 5981 { 5982 /* A global or static variable may also have been stripped 5983 out by the linker if unused, in which case its address 5984 will be nullified; do not add such variables into partial 5985 symbol table then. */ 5986 } 5987 else if (pdi->is_external) 5988 { 5989 /* Global Variable. 5990 Don't enter into the minimal symbol tables as there is 5991 a minimal symbol table entry from the ELF symbols already. 5992 Enter into partial symbol table if it has a location 5993 descriptor or a type. 5994 If the location descriptor is missing, new_symbol will create 5995 a LOC_UNRESOLVED symbol, the address of the variable will then 5996 be determined from the minimal symbol table whenever the variable 5997 is referenced. 5998 The address for the partial symbol table entry is not 5999 used by GDB, but it comes in handy for debugging partial symbol 6000 table building. */ 6001 6002 if (pdi->d.locdesc || pdi->has_type) 6003 add_psymbol_to_list (actual_name, strlen (actual_name), 6004 built_actual_name != NULL, 6005 VAR_DOMAIN, LOC_STATIC, 6006 &objfile->global_psymbols, 6007 0, addr + baseaddr, 6008 cu->language, objfile); 6009 } 6010 else 6011 { 6012 /* Static Variable. Skip symbols without location descriptors. */ 6013 if (pdi->d.locdesc == NULL) 6014 { 6015 xfree (built_actual_name); 6016 return; 6017 } 6018 /* prim_record_minimal_symbol (actual_name, addr + baseaddr, 6019 mst_file_data, objfile); */ 6020 add_psymbol_to_list (actual_name, strlen (actual_name), 6021 built_actual_name != NULL, 6022 VAR_DOMAIN, LOC_STATIC, 6023 &objfile->static_psymbols, 6024 0, addr + baseaddr, 6025 cu->language, objfile); 6026 } 6027 break; 6028 case DW_TAG_typedef: 6029 case DW_TAG_base_type: 6030 case DW_TAG_subrange_type: 6031 add_psymbol_to_list (actual_name, strlen (actual_name), 6032 built_actual_name != NULL, 6033 VAR_DOMAIN, LOC_TYPEDEF, 6034 &objfile->static_psymbols, 6035 0, (CORE_ADDR) 0, cu->language, objfile); 6036 break; 6037 case DW_TAG_namespace: 6038 add_psymbol_to_list (actual_name, strlen (actual_name), 6039 built_actual_name != NULL, 6040 VAR_DOMAIN, LOC_TYPEDEF, 6041 &objfile->global_psymbols, 6042 0, (CORE_ADDR) 0, cu->language, objfile); 6043 break; 6044 case DW_TAG_class_type: 6045 case DW_TAG_interface_type: 6046 case DW_TAG_structure_type: 6047 case DW_TAG_union_type: 6048 case DW_TAG_enumeration_type: 6049 /* Skip external references. The DWARF standard says in the section 6050 about "Structure, Union, and Class Type Entries": "An incomplete 6051 structure, union or class type is represented by a structure, 6052 union or class entry that does not have a byte size attribute 6053 and that has a DW_AT_declaration attribute." */ 6054 if (!pdi->has_byte_size && pdi->is_declaration) 6055 { 6056 xfree (built_actual_name); 6057 return; 6058 } 6059 6060 /* NOTE: carlton/2003-10-07: See comment in new_symbol about 6061 static vs. global. */ 6062 add_psymbol_to_list (actual_name, strlen (actual_name), 6063 built_actual_name != NULL, 6064 STRUCT_DOMAIN, LOC_TYPEDEF, 6065 (cu->language == language_cplus 6066 || cu->language == language_java) 6067 ? &objfile->global_psymbols 6068 : &objfile->static_psymbols, 6069 0, (CORE_ADDR) 0, cu->language, objfile); 6070 6071 break; 6072 case DW_TAG_enumerator: 6073 add_psymbol_to_list (actual_name, strlen (actual_name), 6074 built_actual_name != NULL, 6075 VAR_DOMAIN, LOC_CONST, 6076 (cu->language == language_cplus 6077 || cu->language == language_java) 6078 ? &objfile->global_psymbols 6079 : &objfile->static_psymbols, 6080 0, (CORE_ADDR) 0, cu->language, objfile); 6081 break; 6082 default: 6083 break; 6084 } 6085 6086 xfree (built_actual_name); 6087 } 6088 6089 /* Read a partial die corresponding to a namespace; also, add a symbol 6090 corresponding to that namespace to the symbol table. NAMESPACE is 6091 the name of the enclosing namespace. */ 6092 6093 static void 6094 add_partial_namespace (struct partial_die_info *pdi, 6095 CORE_ADDR *lowpc, CORE_ADDR *highpc, 6096 int need_pc, struct dwarf2_cu *cu) 6097 { 6098 /* Add a symbol for the namespace. */ 6099 6100 add_partial_symbol (pdi, cu); 6101 6102 /* Now scan partial symbols in that namespace. */ 6103 6104 if (pdi->has_children) 6105 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu); 6106 } 6107 6108 /* Read a partial die corresponding to a Fortran module. */ 6109 6110 static void 6111 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, 6112 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu) 6113 { 6114 /* Now scan partial symbols in that module. */ 6115 6116 if (pdi->has_children) 6117 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu); 6118 } 6119 6120 /* Read a partial die corresponding to a subprogram and create a partial 6121 symbol for that subprogram. When the CU language allows it, this 6122 routine also defines a partial symbol for each nested subprogram 6123 that this subprogram contains. 6124 6125 DIE my also be a lexical block, in which case we simply search 6126 recursively for suprograms defined inside that lexical block. 6127 Again, this is only performed when the CU language allows this 6128 type of definitions. */ 6129 6130 static void 6131 add_partial_subprogram (struct partial_die_info *pdi, 6132 CORE_ADDR *lowpc, CORE_ADDR *highpc, 6133 int need_pc, struct dwarf2_cu *cu) 6134 { 6135 if (pdi->tag == DW_TAG_subprogram) 6136 { 6137 if (pdi->has_pc_info) 6138 { 6139 if (pdi->lowpc < *lowpc) 6140 *lowpc = pdi->lowpc; 6141 if (pdi->highpc > *highpc) 6142 *highpc = pdi->highpc; 6143 if (need_pc) 6144 { 6145 CORE_ADDR baseaddr; 6146 struct objfile *objfile = cu->objfile; 6147 6148 baseaddr = ANOFFSET (objfile->section_offsets, 6149 SECT_OFF_TEXT (objfile)); 6150 addrmap_set_empty (objfile->psymtabs_addrmap, 6151 pdi->lowpc + baseaddr, 6152 pdi->highpc - 1 + baseaddr, 6153 cu->per_cu->v.psymtab); 6154 } 6155 } 6156 6157 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined)) 6158 { 6159 if (!pdi->is_declaration) 6160 /* Ignore subprogram DIEs that do not have a name, they are 6161 illegal. Do not emit a complaint at this point, we will 6162 do so when we convert this psymtab into a symtab. */ 6163 if (pdi->name) 6164 add_partial_symbol (pdi, cu); 6165 } 6166 } 6167 6168 if (! pdi->has_children) 6169 return; 6170 6171 if (cu->language == language_ada) 6172 { 6173 pdi = pdi->die_child; 6174 while (pdi != NULL) 6175 { 6176 fixup_partial_die (pdi, cu); 6177 if (pdi->tag == DW_TAG_subprogram 6178 || pdi->tag == DW_TAG_lexical_block) 6179 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu); 6180 pdi = pdi->die_sibling; 6181 } 6182 } 6183 } 6184 6185 /* Read a partial die corresponding to an enumeration type. */ 6186 6187 static void 6188 add_partial_enumeration (struct partial_die_info *enum_pdi, 6189 struct dwarf2_cu *cu) 6190 { 6191 struct partial_die_info *pdi; 6192 6193 if (enum_pdi->name != NULL) 6194 add_partial_symbol (enum_pdi, cu); 6195 6196 pdi = enum_pdi->die_child; 6197 while (pdi) 6198 { 6199 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL) 6200 complaint (&symfile_complaints, _("malformed enumerator DIE ignored")); 6201 else 6202 add_partial_symbol (pdi, cu); 6203 pdi = pdi->die_sibling; 6204 } 6205 } 6206 6207 /* Return the initial uleb128 in the die at INFO_PTR. */ 6208 6209 static unsigned int 6210 peek_abbrev_code (bfd *abfd, gdb_byte *info_ptr) 6211 { 6212 unsigned int bytes_read; 6213 6214 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 6215 } 6216 6217 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU. 6218 Return the corresponding abbrev, or NULL if the number is zero (indicating 6219 an empty DIE). In either case *BYTES_READ will be set to the length of 6220 the initial number. */ 6221 6222 static struct abbrev_info * 6223 peek_die_abbrev (gdb_byte *info_ptr, unsigned int *bytes_read, 6224 struct dwarf2_cu *cu) 6225 { 6226 bfd *abfd = cu->objfile->obfd; 6227 unsigned int abbrev_number; 6228 struct abbrev_info *abbrev; 6229 6230 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read); 6231 6232 if (abbrev_number == 0) 6233 return NULL; 6234 6235 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number); 6236 if (!abbrev) 6237 { 6238 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"), 6239 abbrev_number, bfd_get_filename (abfd)); 6240 } 6241 6242 return abbrev; 6243 } 6244 6245 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. 6246 Returns a pointer to the end of a series of DIEs, terminated by an empty 6247 DIE. Any children of the skipped DIEs will also be skipped. */ 6248 6249 static gdb_byte * 6250 skip_children (const struct die_reader_specs *reader, gdb_byte *info_ptr) 6251 { 6252 struct dwarf2_cu *cu = reader->cu; 6253 struct abbrev_info *abbrev; 6254 unsigned int bytes_read; 6255 6256 while (1) 6257 { 6258 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu); 6259 if (abbrev == NULL) 6260 return info_ptr + bytes_read; 6261 else 6262 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); 6263 } 6264 } 6265 6266 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. 6267 INFO_PTR should point just after the initial uleb128 of a DIE, and the 6268 abbrev corresponding to that skipped uleb128 should be passed in 6269 ABBREV. Returns a pointer to this DIE's sibling, skipping any 6270 children. */ 6271 6272 static gdb_byte * 6273 skip_one_die (const struct die_reader_specs *reader, gdb_byte *info_ptr, 6274 struct abbrev_info *abbrev) 6275 { 6276 unsigned int bytes_read; 6277 struct attribute attr; 6278 bfd *abfd = reader->abfd; 6279 struct dwarf2_cu *cu = reader->cu; 6280 gdb_byte *buffer = reader->buffer; 6281 const gdb_byte *buffer_end = reader->buffer_end; 6282 gdb_byte *start_info_ptr = info_ptr; 6283 unsigned int form, i; 6284 6285 for (i = 0; i < abbrev->num_attrs; i++) 6286 { 6287 /* The only abbrev we care about is DW_AT_sibling. */ 6288 if (abbrev->attrs[i].name == DW_AT_sibling) 6289 { 6290 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr); 6291 if (attr.form == DW_FORM_ref_addr) 6292 complaint (&symfile_complaints, 6293 _("ignoring absolute DW_AT_sibling")); 6294 else 6295 return buffer + dwarf2_get_ref_die_offset (&attr).sect_off; 6296 } 6297 6298 /* If it isn't DW_AT_sibling, skip this attribute. */ 6299 form = abbrev->attrs[i].form; 6300 skip_attribute: 6301 switch (form) 6302 { 6303 case DW_FORM_ref_addr: 6304 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3 6305 and later it is offset sized. */ 6306 if (cu->header.version == 2) 6307 info_ptr += cu->header.addr_size; 6308 else 6309 info_ptr += cu->header.offset_size; 6310 break; 6311 case DW_FORM_GNU_ref_alt: 6312 info_ptr += cu->header.offset_size; 6313 break; 6314 case DW_FORM_addr: 6315 info_ptr += cu->header.addr_size; 6316 break; 6317 case DW_FORM_data1: 6318 case DW_FORM_ref1: 6319 case DW_FORM_flag: 6320 info_ptr += 1; 6321 break; 6322 case DW_FORM_flag_present: 6323 break; 6324 case DW_FORM_data2: 6325 case DW_FORM_ref2: 6326 info_ptr += 2; 6327 break; 6328 case DW_FORM_data4: 6329 case DW_FORM_ref4: 6330 info_ptr += 4; 6331 break; 6332 case DW_FORM_data8: 6333 case DW_FORM_ref8: 6334 case DW_FORM_ref_sig8: 6335 info_ptr += 8; 6336 break; 6337 case DW_FORM_string: 6338 read_direct_string (abfd, info_ptr, &bytes_read); 6339 info_ptr += bytes_read; 6340 break; 6341 case DW_FORM_sec_offset: 6342 case DW_FORM_strp: 6343 case DW_FORM_GNU_strp_alt: 6344 info_ptr += cu->header.offset_size; 6345 break; 6346 case DW_FORM_exprloc: 6347 case DW_FORM_block: 6348 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 6349 info_ptr += bytes_read; 6350 break; 6351 case DW_FORM_block1: 6352 info_ptr += 1 + read_1_byte (abfd, info_ptr); 6353 break; 6354 case DW_FORM_block2: 6355 info_ptr += 2 + read_2_bytes (abfd, info_ptr); 6356 break; 6357 case DW_FORM_block4: 6358 info_ptr += 4 + read_4_bytes (abfd, info_ptr); 6359 break; 6360 case DW_FORM_sdata: 6361 case DW_FORM_udata: 6362 case DW_FORM_ref_udata: 6363 case DW_FORM_GNU_addr_index: 6364 case DW_FORM_GNU_str_index: 6365 info_ptr = (gdb_byte *) safe_skip_leb128 (info_ptr, buffer_end); 6366 break; 6367 case DW_FORM_indirect: 6368 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 6369 info_ptr += bytes_read; 6370 /* We need to continue parsing from here, so just go back to 6371 the top. */ 6372 goto skip_attribute; 6373 6374 default: 6375 error (_("Dwarf Error: Cannot handle %s " 6376 "in DWARF reader [in module %s]"), 6377 dwarf_form_name (form), 6378 bfd_get_filename (abfd)); 6379 } 6380 } 6381 6382 if (abbrev->has_children) 6383 return skip_children (reader, info_ptr); 6384 else 6385 return info_ptr; 6386 } 6387 6388 /* Locate ORIG_PDI's sibling. 6389 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */ 6390 6391 static gdb_byte * 6392 locate_pdi_sibling (const struct die_reader_specs *reader, 6393 struct partial_die_info *orig_pdi, 6394 gdb_byte *info_ptr) 6395 { 6396 /* Do we know the sibling already? */ 6397 6398 if (orig_pdi->sibling) 6399 return orig_pdi->sibling; 6400 6401 /* Are there any children to deal with? */ 6402 6403 if (!orig_pdi->has_children) 6404 return info_ptr; 6405 6406 /* Skip the children the long way. */ 6407 6408 return skip_children (reader, info_ptr); 6409 } 6410 6411 /* Expand this partial symbol table into a full symbol table. SELF is 6412 not NULL. */ 6413 6414 static void 6415 dwarf2_read_symtab (struct partial_symtab *self, 6416 struct objfile *objfile) 6417 { 6418 if (self->readin) 6419 { 6420 warning (_("bug: psymtab for %s is already read in."), 6421 self->filename); 6422 } 6423 else 6424 { 6425 if (info_verbose) 6426 { 6427 printf_filtered (_("Reading in symbols for %s..."), 6428 self->filename); 6429 gdb_flush (gdb_stdout); 6430 } 6431 6432 /* Restore our global data. */ 6433 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key); 6434 6435 /* If this psymtab is constructed from a debug-only objfile, the 6436 has_section_at_zero flag will not necessarily be correct. We 6437 can get the correct value for this flag by looking at the data 6438 associated with the (presumably stripped) associated objfile. */ 6439 if (objfile->separate_debug_objfile_backlink) 6440 { 6441 struct dwarf2_per_objfile *dpo_backlink 6442 = objfile_data (objfile->separate_debug_objfile_backlink, 6443 dwarf2_objfile_data_key); 6444 6445 dwarf2_per_objfile->has_section_at_zero 6446 = dpo_backlink->has_section_at_zero; 6447 } 6448 6449 dwarf2_per_objfile->reading_partial_symbols = 0; 6450 6451 psymtab_to_symtab_1 (self); 6452 6453 /* Finish up the debug error message. */ 6454 if (info_verbose) 6455 printf_filtered (_("done.\n")); 6456 } 6457 6458 process_cu_includes (); 6459 } 6460 6461 /* Reading in full CUs. */ 6462 6463 /* Add PER_CU to the queue. */ 6464 6465 static void 6466 queue_comp_unit (struct dwarf2_per_cu_data *per_cu, 6467 enum language pretend_language) 6468 { 6469 struct dwarf2_queue_item *item; 6470 6471 per_cu->queued = 1; 6472 item = xmalloc (sizeof (*item)); 6473 item->per_cu = per_cu; 6474 item->pretend_language = pretend_language; 6475 item->next = NULL; 6476 6477 if (dwarf2_queue == NULL) 6478 dwarf2_queue = item; 6479 else 6480 dwarf2_queue_tail->next = item; 6481 6482 dwarf2_queue_tail = item; 6483 } 6484 6485 /* THIS_CU has a reference to PER_CU. If necessary, load the new compilation 6486 unit and add it to our queue. 6487 The result is non-zero if PER_CU was queued, otherwise the result is zero 6488 meaning either PER_CU is already queued or it is already loaded. */ 6489 6490 static int 6491 maybe_queue_comp_unit (struct dwarf2_cu *this_cu, 6492 struct dwarf2_per_cu_data *per_cu, 6493 enum language pretend_language) 6494 { 6495 /* We may arrive here during partial symbol reading, if we need full 6496 DIEs to process an unusual case (e.g. template arguments). Do 6497 not queue PER_CU, just tell our caller to load its DIEs. */ 6498 if (dwarf2_per_objfile->reading_partial_symbols) 6499 { 6500 if (per_cu->cu == NULL || per_cu->cu->dies == NULL) 6501 return 1; 6502 return 0; 6503 } 6504 6505 /* Mark the dependence relation so that we don't flush PER_CU 6506 too early. */ 6507 dwarf2_add_dependence (this_cu, per_cu); 6508 6509 /* If it's already on the queue, we have nothing to do. */ 6510 if (per_cu->queued) 6511 return 0; 6512 6513 /* If the compilation unit is already loaded, just mark it as 6514 used. */ 6515 if (per_cu->cu != NULL) 6516 { 6517 per_cu->cu->last_used = 0; 6518 return 0; 6519 } 6520 6521 /* Add it to the queue. */ 6522 queue_comp_unit (per_cu, pretend_language); 6523 6524 return 1; 6525 } 6526 6527 /* Process the queue. */ 6528 6529 static void 6530 process_queue (void) 6531 { 6532 struct dwarf2_queue_item *item, *next_item; 6533 6534 if (dwarf2_read_debug) 6535 { 6536 fprintf_unfiltered (gdb_stdlog, 6537 "Expanding one or more symtabs of objfile %s ...\n", 6538 dwarf2_per_objfile->objfile->name); 6539 } 6540 6541 /* The queue starts out with one item, but following a DIE reference 6542 may load a new CU, adding it to the end of the queue. */ 6543 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item) 6544 { 6545 if (dwarf2_per_objfile->using_index 6546 ? !item->per_cu->v.quick->symtab 6547 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin)) 6548 { 6549 struct dwarf2_per_cu_data *per_cu = item->per_cu; 6550 6551 if (dwarf2_read_debug) 6552 { 6553 fprintf_unfiltered (gdb_stdlog, 6554 "Expanding symtab of %s at offset 0x%x\n", 6555 per_cu->is_debug_types ? "TU" : "CU", 6556 per_cu->offset.sect_off); 6557 } 6558 6559 if (per_cu->is_debug_types) 6560 process_full_type_unit (per_cu, item->pretend_language); 6561 else 6562 process_full_comp_unit (per_cu, item->pretend_language); 6563 6564 if (dwarf2_read_debug) 6565 { 6566 fprintf_unfiltered (gdb_stdlog, 6567 "Done expanding %s at offset 0x%x\n", 6568 per_cu->is_debug_types ? "TU" : "CU", 6569 per_cu->offset.sect_off); 6570 } 6571 } 6572 6573 item->per_cu->queued = 0; 6574 next_item = item->next; 6575 xfree (item); 6576 } 6577 6578 dwarf2_queue_tail = NULL; 6579 6580 if (dwarf2_read_debug) 6581 { 6582 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n", 6583 dwarf2_per_objfile->objfile->name); 6584 } 6585 } 6586 6587 /* Free all allocated queue entries. This function only releases anything if 6588 an error was thrown; if the queue was processed then it would have been 6589 freed as we went along. */ 6590 6591 static void 6592 dwarf2_release_queue (void *dummy) 6593 { 6594 struct dwarf2_queue_item *item, *last; 6595 6596 item = dwarf2_queue; 6597 while (item) 6598 { 6599 /* Anything still marked queued is likely to be in an 6600 inconsistent state, so discard it. */ 6601 if (item->per_cu->queued) 6602 { 6603 if (item->per_cu->cu != NULL) 6604 free_one_cached_comp_unit (item->per_cu); 6605 item->per_cu->queued = 0; 6606 } 6607 6608 last = item; 6609 item = item->next; 6610 xfree (last); 6611 } 6612 6613 dwarf2_queue = dwarf2_queue_tail = NULL; 6614 } 6615 6616 /* Read in full symbols for PST, and anything it depends on. */ 6617 6618 static void 6619 psymtab_to_symtab_1 (struct partial_symtab *pst) 6620 { 6621 struct dwarf2_per_cu_data *per_cu; 6622 int i; 6623 6624 if (pst->readin) 6625 return; 6626 6627 for (i = 0; i < pst->number_of_dependencies; i++) 6628 if (!pst->dependencies[i]->readin 6629 && pst->dependencies[i]->user == NULL) 6630 { 6631 /* Inform about additional files that need to be read in. */ 6632 if (info_verbose) 6633 { 6634 /* FIXME: i18n: Need to make this a single string. */ 6635 fputs_filtered (" ", gdb_stdout); 6636 wrap_here (""); 6637 fputs_filtered ("and ", gdb_stdout); 6638 wrap_here (""); 6639 printf_filtered ("%s...", pst->dependencies[i]->filename); 6640 wrap_here (""); /* Flush output. */ 6641 gdb_flush (gdb_stdout); 6642 } 6643 psymtab_to_symtab_1 (pst->dependencies[i]); 6644 } 6645 6646 per_cu = pst->read_symtab_private; 6647 6648 if (per_cu == NULL) 6649 { 6650 /* It's an include file, no symbols to read for it. 6651 Everything is in the parent symtab. */ 6652 pst->readin = 1; 6653 return; 6654 } 6655 6656 dw2_do_instantiate_symtab (per_cu); 6657 } 6658 6659 /* Trivial hash function for die_info: the hash value of a DIE 6660 is its offset in .debug_info for this objfile. */ 6661 6662 static hashval_t 6663 die_hash (const void *item) 6664 { 6665 const struct die_info *die = item; 6666 6667 return die->offset.sect_off; 6668 } 6669 6670 /* Trivial comparison function for die_info structures: two DIEs 6671 are equal if they have the same offset. */ 6672 6673 static int 6674 die_eq (const void *item_lhs, const void *item_rhs) 6675 { 6676 const struct die_info *die_lhs = item_lhs; 6677 const struct die_info *die_rhs = item_rhs; 6678 6679 return die_lhs->offset.sect_off == die_rhs->offset.sect_off; 6680 } 6681 6682 /* die_reader_func for load_full_comp_unit. 6683 This is identical to read_signatured_type_reader, 6684 but is kept separate for now. */ 6685 6686 static void 6687 load_full_comp_unit_reader (const struct die_reader_specs *reader, 6688 gdb_byte *info_ptr, 6689 struct die_info *comp_unit_die, 6690 int has_children, 6691 void *data) 6692 { 6693 struct dwarf2_cu *cu = reader->cu; 6694 enum language *language_ptr = data; 6695 6696 gdb_assert (cu->die_hash == NULL); 6697 cu->die_hash = 6698 htab_create_alloc_ex (cu->header.length / 12, 6699 die_hash, 6700 die_eq, 6701 NULL, 6702 &cu->comp_unit_obstack, 6703 hashtab_obstack_allocate, 6704 dummy_obstack_deallocate); 6705 6706 if (has_children) 6707 comp_unit_die->child = read_die_and_siblings (reader, info_ptr, 6708 &info_ptr, comp_unit_die); 6709 cu->dies = comp_unit_die; 6710 /* comp_unit_die is not stored in die_hash, no need. */ 6711 6712 /* We try not to read any attributes in this function, because not 6713 all CUs needed for references have been loaded yet, and symbol 6714 table processing isn't initialized. But we have to set the CU language, 6715 or we won't be able to build types correctly. 6716 Similarly, if we do not read the producer, we can not apply 6717 producer-specific interpretation. */ 6718 prepare_one_comp_unit (cu, cu->dies, *language_ptr); 6719 } 6720 6721 /* Load the DIEs associated with PER_CU into memory. */ 6722 6723 static void 6724 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu, 6725 enum language pretend_language) 6726 { 6727 gdb_assert (! this_cu->is_debug_types); 6728 6729 init_cutu_and_read_dies (this_cu, NULL, 1, 1, 6730 load_full_comp_unit_reader, &pretend_language); 6731 } 6732 6733 /* Add a DIE to the delayed physname list. */ 6734 6735 static void 6736 add_to_method_list (struct type *type, int fnfield_index, int index, 6737 const char *name, struct die_info *die, 6738 struct dwarf2_cu *cu) 6739 { 6740 struct delayed_method_info mi; 6741 mi.type = type; 6742 mi.fnfield_index = fnfield_index; 6743 mi.index = index; 6744 mi.name = name; 6745 mi.die = die; 6746 VEC_safe_push (delayed_method_info, cu->method_list, &mi); 6747 } 6748 6749 /* A cleanup for freeing the delayed method list. */ 6750 6751 static void 6752 free_delayed_list (void *ptr) 6753 { 6754 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr; 6755 if (cu->method_list != NULL) 6756 { 6757 VEC_free (delayed_method_info, cu->method_list); 6758 cu->method_list = NULL; 6759 } 6760 } 6761 6762 /* Compute the physnames of any methods on the CU's method list. 6763 6764 The computation of method physnames is delayed in order to avoid the 6765 (bad) condition that one of the method's formal parameters is of an as yet 6766 incomplete type. */ 6767 6768 static void 6769 compute_delayed_physnames (struct dwarf2_cu *cu) 6770 { 6771 int i; 6772 struct delayed_method_info *mi; 6773 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i) 6774 { 6775 const char *physname; 6776 struct fn_fieldlist *fn_flp 6777 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index); 6778 physname = dwarf2_physname (mi->name, mi->die, cu); 6779 fn_flp->fn_fields[mi->index].physname = physname ? physname : ""; 6780 } 6781 } 6782 6783 /* Go objects should be embedded in a DW_TAG_module DIE, 6784 and it's not clear if/how imported objects will appear. 6785 To keep Go support simple until that's worked out, 6786 go back through what we've read and create something usable. 6787 We could do this while processing each DIE, and feels kinda cleaner, 6788 but that way is more invasive. 6789 This is to, for example, allow the user to type "p var" or "b main" 6790 without having to specify the package name, and allow lookups 6791 of module.object to work in contexts that use the expression 6792 parser. */ 6793 6794 static void 6795 fixup_go_packaging (struct dwarf2_cu *cu) 6796 { 6797 char *package_name = NULL; 6798 struct pending *list; 6799 int i; 6800 6801 for (list = global_symbols; list != NULL; list = list->next) 6802 { 6803 for (i = 0; i < list->nsyms; ++i) 6804 { 6805 struct symbol *sym = list->symbol[i]; 6806 6807 if (SYMBOL_LANGUAGE (sym) == language_go 6808 && SYMBOL_CLASS (sym) == LOC_BLOCK) 6809 { 6810 char *this_package_name = go_symbol_package_name (sym); 6811 6812 if (this_package_name == NULL) 6813 continue; 6814 if (package_name == NULL) 6815 package_name = this_package_name; 6816 else 6817 { 6818 if (strcmp (package_name, this_package_name) != 0) 6819 complaint (&symfile_complaints, 6820 _("Symtab %s has objects from two different Go packages: %s and %s"), 6821 (SYMBOL_SYMTAB (sym) 6822 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym)) 6823 : cu->objfile->name), 6824 this_package_name, package_name); 6825 xfree (this_package_name); 6826 } 6827 } 6828 } 6829 } 6830 6831 if (package_name != NULL) 6832 { 6833 struct objfile *objfile = cu->objfile; 6834 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack, 6835 package_name, 6836 strlen (package_name)); 6837 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0, 6838 saved_package_name, objfile); 6839 struct symbol *sym; 6840 6841 TYPE_TAG_NAME (type) = TYPE_NAME (type); 6842 6843 sym = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symbol); 6844 SYMBOL_SET_LANGUAGE (sym, language_go); 6845 SYMBOL_SET_NAMES (sym, saved_package_name, 6846 strlen (saved_package_name), 0, objfile); 6847 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of, 6848 e.g., "main" finds the "main" module and not C's main(). */ 6849 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; 6850 SYMBOL_CLASS (sym) = LOC_TYPEDEF; 6851 SYMBOL_TYPE (sym) = type; 6852 6853 add_symbol_to_list (sym, &global_symbols); 6854 6855 xfree (package_name); 6856 } 6857 } 6858 6859 static void compute_symtab_includes (struct dwarf2_per_cu_data *per_cu); 6860 6861 /* Return the symtab for PER_CU. This works properly regardless of 6862 whether we're using the index or psymtabs. */ 6863 6864 static struct symtab * 6865 get_symtab (struct dwarf2_per_cu_data *per_cu) 6866 { 6867 return (dwarf2_per_objfile->using_index 6868 ? per_cu->v.quick->symtab 6869 : per_cu->v.psymtab->symtab); 6870 } 6871 6872 /* A helper function for computing the list of all symbol tables 6873 included by PER_CU. */ 6874 6875 static void 6876 recursively_compute_inclusions (VEC (dwarf2_per_cu_ptr) **result, 6877 htab_t all_children, 6878 struct dwarf2_per_cu_data *per_cu) 6879 { 6880 void **slot; 6881 int ix; 6882 struct dwarf2_per_cu_data *iter; 6883 6884 slot = htab_find_slot (all_children, per_cu, INSERT); 6885 if (*slot != NULL) 6886 { 6887 /* This inclusion and its children have been processed. */ 6888 return; 6889 } 6890 6891 *slot = per_cu; 6892 /* Only add a CU if it has a symbol table. */ 6893 if (get_symtab (per_cu) != NULL) 6894 VEC_safe_push (dwarf2_per_cu_ptr, *result, per_cu); 6895 6896 for (ix = 0; 6897 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter); 6898 ++ix) 6899 recursively_compute_inclusions (result, all_children, iter); 6900 } 6901 6902 /* Compute the symtab 'includes' fields for the symtab related to 6903 PER_CU. */ 6904 6905 static void 6906 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu) 6907 { 6908 gdb_assert (! per_cu->is_debug_types); 6909 6910 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs)) 6911 { 6912 int ix, len; 6913 struct dwarf2_per_cu_data *iter; 6914 VEC (dwarf2_per_cu_ptr) *result_children = NULL; 6915 htab_t all_children; 6916 struct symtab *symtab = get_symtab (per_cu); 6917 6918 /* If we don't have a symtab, we can just skip this case. */ 6919 if (symtab == NULL) 6920 return; 6921 6922 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer, 6923 NULL, xcalloc, xfree); 6924 6925 for (ix = 0; 6926 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, 6927 ix, iter); 6928 ++ix) 6929 recursively_compute_inclusions (&result_children, all_children, iter); 6930 6931 /* Now we have a transitive closure of all the included CUs, and 6932 for .gdb_index version 7 the included TUs, so we can convert it 6933 to a list of symtabs. */ 6934 len = VEC_length (dwarf2_per_cu_ptr, result_children); 6935 symtab->includes 6936 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack, 6937 (len + 1) * sizeof (struct symtab *)); 6938 for (ix = 0; 6939 VEC_iterate (dwarf2_per_cu_ptr, result_children, ix, iter); 6940 ++ix) 6941 symtab->includes[ix] = get_symtab (iter); 6942 symtab->includes[len] = NULL; 6943 6944 VEC_free (dwarf2_per_cu_ptr, result_children); 6945 htab_delete (all_children); 6946 } 6947 } 6948 6949 /* Compute the 'includes' field for the symtabs of all the CUs we just 6950 read. */ 6951 6952 static void 6953 process_cu_includes (void) 6954 { 6955 int ix; 6956 struct dwarf2_per_cu_data *iter; 6957 6958 for (ix = 0; 6959 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, 6960 ix, iter); 6961 ++ix) 6962 { 6963 if (! iter->is_debug_types) 6964 compute_symtab_includes (iter); 6965 } 6966 6967 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus); 6968 } 6969 6970 /* Generate full symbol information for PER_CU, whose DIEs have 6971 already been loaded into memory. */ 6972 6973 static void 6974 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu, 6975 enum language pretend_language) 6976 { 6977 struct dwarf2_cu *cu = per_cu->cu; 6978 struct objfile *objfile = per_cu->objfile; 6979 CORE_ADDR lowpc, highpc; 6980 struct symtab *symtab; 6981 struct cleanup *back_to, *delayed_list_cleanup; 6982 CORE_ADDR baseaddr; 6983 struct block *static_block; 6984 6985 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 6986 6987 buildsym_init (); 6988 back_to = make_cleanup (really_free_pendings, NULL); 6989 delayed_list_cleanup = make_cleanup (free_delayed_list, cu); 6990 6991 cu->list_in_scope = &file_symbols; 6992 6993 cu->language = pretend_language; 6994 cu->language_defn = language_def (cu->language); 6995 6996 /* Do line number decoding in read_file_scope () */ 6997 process_die (cu->dies, cu); 6998 6999 /* For now fudge the Go package. */ 7000 if (cu->language == language_go) 7001 fixup_go_packaging (cu); 7002 7003 /* Now that we have processed all the DIEs in the CU, all the types 7004 should be complete, and it should now be safe to compute all of the 7005 physnames. */ 7006 compute_delayed_physnames (cu); 7007 do_cleanups (delayed_list_cleanup); 7008 7009 /* Some compilers don't define a DW_AT_high_pc attribute for the 7010 compilation unit. If the DW_AT_high_pc is missing, synthesize 7011 it, by scanning the DIE's below the compilation unit. */ 7012 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu); 7013 7014 static_block 7015 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0, 7016 per_cu->imported_symtabs != NULL); 7017 7018 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges. 7019 Also, DW_AT_ranges may record ranges not belonging to any child DIEs 7020 (such as virtual method tables). Record the ranges in STATIC_BLOCK's 7021 addrmap to help ensure it has an accurate map of pc values belonging to 7022 this comp unit. */ 7023 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu); 7024 7025 symtab = end_symtab_from_static_block (static_block, objfile, 7026 SECT_OFF_TEXT (objfile), 0); 7027 7028 if (symtab != NULL) 7029 { 7030 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer); 7031 7032 /* Set symtab language to language from DW_AT_language. If the 7033 compilation is from a C file generated by language preprocessors, do 7034 not set the language if it was already deduced by start_subfile. */ 7035 if (!(cu->language == language_c && symtab->language != language_c)) 7036 symtab->language = cu->language; 7037 7038 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can 7039 produce DW_AT_location with location lists but it can be possibly 7040 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0 7041 there were bugs in prologue debug info, fixed later in GCC-4.5 7042 by "unwind info for epilogues" patch (which is not directly related). 7043 7044 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not 7045 needed, it would be wrong due to missing DW_AT_producer there. 7046 7047 Still one can confuse GDB by using non-standard GCC compilation 7048 options - this waits on GCC PR other/32998 (-frecord-gcc-switches). 7049 */ 7050 if (cu->has_loclist && gcc_4_minor >= 5) 7051 symtab->locations_valid = 1; 7052 7053 if (gcc_4_minor >= 5) 7054 symtab->epilogue_unwind_valid = 1; 7055 7056 symtab->call_site_htab = cu->call_site_htab; 7057 } 7058 7059 if (dwarf2_per_objfile->using_index) 7060 per_cu->v.quick->symtab = symtab; 7061 else 7062 { 7063 struct partial_symtab *pst = per_cu->v.psymtab; 7064 pst->symtab = symtab; 7065 pst->readin = 1; 7066 } 7067 7068 /* Push it for inclusion processing later. */ 7069 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu); 7070 7071 do_cleanups (back_to); 7072 } 7073 7074 /* Generate full symbol information for type unit PER_CU, whose DIEs have 7075 already been loaded into memory. */ 7076 7077 static void 7078 process_full_type_unit (struct dwarf2_per_cu_data *per_cu, 7079 enum language pretend_language) 7080 { 7081 struct dwarf2_cu *cu = per_cu->cu; 7082 struct objfile *objfile = per_cu->objfile; 7083 struct symtab *symtab; 7084 struct cleanup *back_to, *delayed_list_cleanup; 7085 7086 buildsym_init (); 7087 back_to = make_cleanup (really_free_pendings, NULL); 7088 delayed_list_cleanup = make_cleanup (free_delayed_list, cu); 7089 7090 cu->list_in_scope = &file_symbols; 7091 7092 cu->language = pretend_language; 7093 cu->language_defn = language_def (cu->language); 7094 7095 /* The symbol tables are set up in read_type_unit_scope. */ 7096 process_die (cu->dies, cu); 7097 7098 /* For now fudge the Go package. */ 7099 if (cu->language == language_go) 7100 fixup_go_packaging (cu); 7101 7102 /* Now that we have processed all the DIEs in the CU, all the types 7103 should be complete, and it should now be safe to compute all of the 7104 physnames. */ 7105 compute_delayed_physnames (cu); 7106 do_cleanups (delayed_list_cleanup); 7107 7108 /* TUs share symbol tables. 7109 If this is the first TU to use this symtab, complete the construction 7110 of it with end_expandable_symtab. Otherwise, complete the addition of 7111 this TU's symbols to the existing symtab. */ 7112 if (per_cu->type_unit_group->primary_symtab == NULL) 7113 { 7114 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile)); 7115 per_cu->type_unit_group->primary_symtab = symtab; 7116 7117 if (symtab != NULL) 7118 { 7119 /* Set symtab language to language from DW_AT_language. If the 7120 compilation is from a C file generated by language preprocessors, 7121 do not set the language if it was already deduced by 7122 start_subfile. */ 7123 if (!(cu->language == language_c && symtab->language != language_c)) 7124 symtab->language = cu->language; 7125 } 7126 } 7127 else 7128 { 7129 augment_type_symtab (objfile, 7130 per_cu->type_unit_group->primary_symtab); 7131 symtab = per_cu->type_unit_group->primary_symtab; 7132 } 7133 7134 if (dwarf2_per_objfile->using_index) 7135 per_cu->v.quick->symtab = symtab; 7136 else 7137 { 7138 struct partial_symtab *pst = per_cu->v.psymtab; 7139 pst->symtab = symtab; 7140 pst->readin = 1; 7141 } 7142 7143 do_cleanups (back_to); 7144 } 7145 7146 /* Process an imported unit DIE. */ 7147 7148 static void 7149 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu) 7150 { 7151 struct attribute *attr; 7152 7153 /* For now we don't handle imported units in type units. */ 7154 if (cu->per_cu->is_debug_types) 7155 { 7156 error (_("Dwarf Error: DW_TAG_imported_unit is not" 7157 " supported in type units [in module %s]"), 7158 cu->objfile->name); 7159 } 7160 7161 attr = dwarf2_attr (die, DW_AT_import, cu); 7162 if (attr != NULL) 7163 { 7164 struct dwarf2_per_cu_data *per_cu; 7165 struct symtab *imported_symtab; 7166 sect_offset offset; 7167 int is_dwz; 7168 7169 offset = dwarf2_get_ref_die_offset (attr); 7170 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz); 7171 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile); 7172 7173 /* Queue the unit, if needed. */ 7174 if (maybe_queue_comp_unit (cu, per_cu, cu->language)) 7175 load_full_comp_unit (per_cu, cu->language); 7176 7177 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs, 7178 per_cu); 7179 } 7180 } 7181 7182 /* Process a die and its children. */ 7183 7184 static void 7185 process_die (struct die_info *die, struct dwarf2_cu *cu) 7186 { 7187 switch (die->tag) 7188 { 7189 case DW_TAG_padding: 7190 break; 7191 case DW_TAG_compile_unit: 7192 case DW_TAG_partial_unit: 7193 read_file_scope (die, cu); 7194 break; 7195 case DW_TAG_type_unit: 7196 read_type_unit_scope (die, cu); 7197 break; 7198 case DW_TAG_subprogram: 7199 case DW_TAG_inlined_subroutine: 7200 read_func_scope (die, cu); 7201 break; 7202 case DW_TAG_lexical_block: 7203 case DW_TAG_try_block: 7204 case DW_TAG_catch_block: 7205 read_lexical_block_scope (die, cu); 7206 break; 7207 case DW_TAG_GNU_call_site: 7208 read_call_site_scope (die, cu); 7209 break; 7210 case DW_TAG_class_type: 7211 case DW_TAG_interface_type: 7212 case DW_TAG_structure_type: 7213 case DW_TAG_union_type: 7214 process_structure_scope (die, cu); 7215 break; 7216 case DW_TAG_enumeration_type: 7217 process_enumeration_scope (die, cu); 7218 break; 7219 7220 /* These dies have a type, but processing them does not create 7221 a symbol or recurse to process the children. Therefore we can 7222 read them on-demand through read_type_die. */ 7223 case DW_TAG_subroutine_type: 7224 case DW_TAG_set_type: 7225 case DW_TAG_array_type: 7226 case DW_TAG_pointer_type: 7227 case DW_TAG_ptr_to_member_type: 7228 case DW_TAG_reference_type: 7229 case DW_TAG_string_type: 7230 break; 7231 7232 case DW_TAG_base_type: 7233 case DW_TAG_subrange_type: 7234 case DW_TAG_typedef: 7235 /* Add a typedef symbol for the type definition, if it has a 7236 DW_AT_name. */ 7237 new_symbol (die, read_type_die (die, cu), cu); 7238 break; 7239 case DW_TAG_common_block: 7240 read_common_block (die, cu); 7241 break; 7242 case DW_TAG_common_inclusion: 7243 break; 7244 case DW_TAG_namespace: 7245 cu->processing_has_namespace_info = 1; 7246 read_namespace (die, cu); 7247 break; 7248 case DW_TAG_module: 7249 cu->processing_has_namespace_info = 1; 7250 read_module (die, cu); 7251 break; 7252 case DW_TAG_imported_declaration: 7253 case DW_TAG_imported_module: 7254 cu->processing_has_namespace_info = 1; 7255 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration 7256 || cu->language != language_fortran)) 7257 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"), 7258 dwarf_tag_name (die->tag)); 7259 read_import_statement (die, cu); 7260 break; 7261 7262 case DW_TAG_imported_unit: 7263 process_imported_unit_die (die, cu); 7264 break; 7265 7266 default: 7267 new_symbol (die, NULL, cu); 7268 break; 7269 } 7270 } 7271 7272 /* A helper function for dwarf2_compute_name which determines whether DIE 7273 needs to have the name of the scope prepended to the name listed in the 7274 die. */ 7275 7276 static int 7277 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu) 7278 { 7279 struct attribute *attr; 7280 7281 switch (die->tag) 7282 { 7283 case DW_TAG_namespace: 7284 case DW_TAG_typedef: 7285 case DW_TAG_class_type: 7286 case DW_TAG_interface_type: 7287 case DW_TAG_structure_type: 7288 case DW_TAG_union_type: 7289 case DW_TAG_enumeration_type: 7290 case DW_TAG_enumerator: 7291 case DW_TAG_subprogram: 7292 case DW_TAG_member: 7293 return 1; 7294 7295 case DW_TAG_variable: 7296 case DW_TAG_constant: 7297 /* We only need to prefix "globally" visible variables. These include 7298 any variable marked with DW_AT_external or any variable that 7299 lives in a namespace. [Variables in anonymous namespaces 7300 require prefixing, but they are not DW_AT_external.] */ 7301 7302 if (dwarf2_attr (die, DW_AT_specification, cu)) 7303 { 7304 struct dwarf2_cu *spec_cu = cu; 7305 7306 return die_needs_namespace (die_specification (die, &spec_cu), 7307 spec_cu); 7308 } 7309 7310 attr = dwarf2_attr (die, DW_AT_external, cu); 7311 if (attr == NULL && die->parent->tag != DW_TAG_namespace 7312 && die->parent->tag != DW_TAG_module) 7313 return 0; 7314 /* A variable in a lexical block of some kind does not need a 7315 namespace, even though in C++ such variables may be external 7316 and have a mangled name. */ 7317 if (die->parent->tag == DW_TAG_lexical_block 7318 || die->parent->tag == DW_TAG_try_block 7319 || die->parent->tag == DW_TAG_catch_block 7320 || die->parent->tag == DW_TAG_subprogram) 7321 return 0; 7322 return 1; 7323 7324 default: 7325 return 0; 7326 } 7327 } 7328 7329 /* Retrieve the last character from a mem_file. */ 7330 7331 static void 7332 do_ui_file_peek_last (void *object, const char *buffer, long length) 7333 { 7334 char *last_char_p = (char *) object; 7335 7336 if (length > 0) 7337 *last_char_p = buffer[length - 1]; 7338 } 7339 7340 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero, 7341 compute the physname for the object, which include a method's: 7342 - formal parameters (C++/Java), 7343 - receiver type (Go), 7344 - return type (Java). 7345 7346 The term "physname" is a bit confusing. 7347 For C++, for example, it is the demangled name. 7348 For Go, for example, it's the mangled name. 7349 7350 For Ada, return the DIE's linkage name rather than the fully qualified 7351 name. PHYSNAME is ignored.. 7352 7353 The result is allocated on the objfile_obstack and canonicalized. */ 7354 7355 static const char * 7356 dwarf2_compute_name (const char *name, 7357 struct die_info *die, struct dwarf2_cu *cu, 7358 int physname) 7359 { 7360 struct objfile *objfile = cu->objfile; 7361 7362 if (name == NULL) 7363 name = dwarf2_name (die, cu); 7364 7365 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise 7366 compute it by typename_concat inside GDB. */ 7367 if (cu->language == language_ada 7368 || (cu->language == language_fortran && physname)) 7369 { 7370 /* For Ada unit, we prefer the linkage name over the name, as 7371 the former contains the exported name, which the user expects 7372 to be able to reference. Ideally, we want the user to be able 7373 to reference this entity using either natural or linkage name, 7374 but we haven't started looking at this enhancement yet. */ 7375 struct attribute *attr; 7376 7377 attr = dwarf2_attr (die, DW_AT_linkage_name, cu); 7378 if (attr == NULL) 7379 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); 7380 if (attr && DW_STRING (attr)) 7381 return DW_STRING (attr); 7382 } 7383 7384 /* These are the only languages we know how to qualify names in. */ 7385 if (name != NULL 7386 && (cu->language == language_cplus || cu->language == language_java 7387 || cu->language == language_fortran)) 7388 { 7389 if (die_needs_namespace (die, cu)) 7390 { 7391 long length; 7392 const char *prefix; 7393 struct ui_file *buf; 7394 7395 prefix = determine_prefix (die, cu); 7396 buf = mem_fileopen (); 7397 if (*prefix != '\0') 7398 { 7399 char *prefixed_name = typename_concat (NULL, prefix, name, 7400 physname, cu); 7401 7402 fputs_unfiltered (prefixed_name, buf); 7403 xfree (prefixed_name); 7404 } 7405 else 7406 fputs_unfiltered (name, buf); 7407 7408 /* Template parameters may be specified in the DIE's DW_AT_name, or 7409 as children with DW_TAG_template_type_param or 7410 DW_TAG_value_type_param. If the latter, add them to the name 7411 here. If the name already has template parameters, then 7412 skip this step; some versions of GCC emit both, and 7413 it is more efficient to use the pre-computed name. 7414 7415 Something to keep in mind about this process: it is very 7416 unlikely, or in some cases downright impossible, to produce 7417 something that will match the mangled name of a function. 7418 If the definition of the function has the same debug info, 7419 we should be able to match up with it anyway. But fallbacks 7420 using the minimal symbol, for instance to find a method 7421 implemented in a stripped copy of libstdc++, will not work. 7422 If we do not have debug info for the definition, we will have to 7423 match them up some other way. 7424 7425 When we do name matching there is a related problem with function 7426 templates; two instantiated function templates are allowed to 7427 differ only by their return types, which we do not add here. */ 7428 7429 if (cu->language == language_cplus && strchr (name, '<') == NULL) 7430 { 7431 struct attribute *attr; 7432 struct die_info *child; 7433 int first = 1; 7434 7435 die->building_fullname = 1; 7436 7437 for (child = die->child; child != NULL; child = child->sibling) 7438 { 7439 struct type *type; 7440 LONGEST value; 7441 gdb_byte *bytes; 7442 struct dwarf2_locexpr_baton *baton; 7443 struct value *v; 7444 7445 if (child->tag != DW_TAG_template_type_param 7446 && child->tag != DW_TAG_template_value_param) 7447 continue; 7448 7449 if (first) 7450 { 7451 fputs_unfiltered ("<", buf); 7452 first = 0; 7453 } 7454 else 7455 fputs_unfiltered (", ", buf); 7456 7457 attr = dwarf2_attr (child, DW_AT_type, cu); 7458 if (attr == NULL) 7459 { 7460 complaint (&symfile_complaints, 7461 _("template parameter missing DW_AT_type")); 7462 fputs_unfiltered ("UNKNOWN_TYPE", buf); 7463 continue; 7464 } 7465 type = die_type (child, cu); 7466 7467 if (child->tag == DW_TAG_template_type_param) 7468 { 7469 c_print_type (type, "", buf, -1, 0, &type_print_raw_options); 7470 continue; 7471 } 7472 7473 attr = dwarf2_attr (child, DW_AT_const_value, cu); 7474 if (attr == NULL) 7475 { 7476 complaint (&symfile_complaints, 7477 _("template parameter missing " 7478 "DW_AT_const_value")); 7479 fputs_unfiltered ("UNKNOWN_VALUE", buf); 7480 continue; 7481 } 7482 7483 dwarf2_const_value_attr (attr, type, name, 7484 &cu->comp_unit_obstack, cu, 7485 &value, &bytes, &baton); 7486 7487 if (TYPE_NOSIGN (type)) 7488 /* GDB prints characters as NUMBER 'CHAR'. If that's 7489 changed, this can use value_print instead. */ 7490 c_printchar (value, type, buf); 7491 else 7492 { 7493 struct value_print_options opts; 7494 7495 if (baton != NULL) 7496 v = dwarf2_evaluate_loc_desc (type, NULL, 7497 baton->data, 7498 baton->size, 7499 baton->per_cu); 7500 else if (bytes != NULL) 7501 { 7502 v = allocate_value (type); 7503 memcpy (value_contents_writeable (v), bytes, 7504 TYPE_LENGTH (type)); 7505 } 7506 else 7507 v = value_from_longest (type, value); 7508 7509 /* Specify decimal so that we do not depend on 7510 the radix. */ 7511 get_formatted_print_options (&opts, 'd'); 7512 opts.raw = 1; 7513 value_print (v, buf, &opts); 7514 release_value (v); 7515 value_free (v); 7516 } 7517 } 7518 7519 die->building_fullname = 0; 7520 7521 if (!first) 7522 { 7523 /* Close the argument list, with a space if necessary 7524 (nested templates). */ 7525 char last_char = '\0'; 7526 ui_file_put (buf, do_ui_file_peek_last, &last_char); 7527 if (last_char == '>') 7528 fputs_unfiltered (" >", buf); 7529 else 7530 fputs_unfiltered (">", buf); 7531 } 7532 } 7533 7534 /* For Java and C++ methods, append formal parameter type 7535 information, if PHYSNAME. */ 7536 7537 if (physname && die->tag == DW_TAG_subprogram 7538 && (cu->language == language_cplus 7539 || cu->language == language_java)) 7540 { 7541 struct type *type = read_type_die (die, cu); 7542 7543 c_type_print_args (type, buf, 1, cu->language, 7544 &type_print_raw_options); 7545 7546 if (cu->language == language_java) 7547 { 7548 /* For java, we must append the return type to method 7549 names. */ 7550 if (die->tag == DW_TAG_subprogram) 7551 java_print_type (TYPE_TARGET_TYPE (type), "", buf, 7552 0, 0, &type_print_raw_options); 7553 } 7554 else if (cu->language == language_cplus) 7555 { 7556 /* Assume that an artificial first parameter is 7557 "this", but do not crash if it is not. RealView 7558 marks unnamed (and thus unused) parameters as 7559 artificial; there is no way to differentiate 7560 the two cases. */ 7561 if (TYPE_NFIELDS (type) > 0 7562 && TYPE_FIELD_ARTIFICIAL (type, 0) 7563 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR 7564 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 7565 0)))) 7566 fputs_unfiltered (" const", buf); 7567 } 7568 } 7569 7570 name = ui_file_obsavestring (buf, &objfile->objfile_obstack, 7571 &length); 7572 ui_file_delete (buf); 7573 7574 if (cu->language == language_cplus) 7575 { 7576 const char *cname 7577 = dwarf2_canonicalize_name (name, cu, 7578 &objfile->objfile_obstack); 7579 7580 if (cname != NULL) 7581 name = cname; 7582 } 7583 } 7584 } 7585 7586 return name; 7587 } 7588 7589 /* Return the fully qualified name of DIE, based on its DW_AT_name. 7590 If scope qualifiers are appropriate they will be added. The result 7591 will be allocated on the objfile_obstack, or NULL if the DIE does 7592 not have a name. NAME may either be from a previous call to 7593 dwarf2_name or NULL. 7594 7595 The output string will be canonicalized (if C++/Java). */ 7596 7597 static const char * 7598 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu) 7599 { 7600 return dwarf2_compute_name (name, die, cu, 0); 7601 } 7602 7603 /* Construct a physname for the given DIE in CU. NAME may either be 7604 from a previous call to dwarf2_name or NULL. The result will be 7605 allocated on the objfile_objstack or NULL if the DIE does not have a 7606 name. 7607 7608 The output string will be canonicalized (if C++/Java). */ 7609 7610 static const char * 7611 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu) 7612 { 7613 struct objfile *objfile = cu->objfile; 7614 struct attribute *attr; 7615 const char *retval, *mangled = NULL, *canon = NULL; 7616 struct cleanup *back_to; 7617 int need_copy = 1; 7618 7619 /* In this case dwarf2_compute_name is just a shortcut not building anything 7620 on its own. */ 7621 if (!die_needs_namespace (die, cu)) 7622 return dwarf2_compute_name (name, die, cu, 1); 7623 7624 back_to = make_cleanup (null_cleanup, NULL); 7625 7626 attr = dwarf2_attr (die, DW_AT_linkage_name, cu); 7627 if (!attr) 7628 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); 7629 7630 /* DW_AT_linkage_name is missing in some cases - depend on what GDB 7631 has computed. */ 7632 if (attr && DW_STRING (attr)) 7633 { 7634 char *demangled; 7635 7636 mangled = DW_STRING (attr); 7637 7638 /* Use DMGL_RET_DROP for C++ template functions to suppress their return 7639 type. It is easier for GDB users to search for such functions as 7640 `name(params)' than `long name(params)'. In such case the minimal 7641 symbol names do not match the full symbol names but for template 7642 functions there is never a need to look up their definition from their 7643 declaration so the only disadvantage remains the minimal symbol 7644 variant `long name(params)' does not have the proper inferior type. 7645 */ 7646 7647 if (cu->language == language_go) 7648 { 7649 /* This is a lie, but we already lie to the caller new_symbol_full. 7650 new_symbol_full assumes we return the mangled name. 7651 This just undoes that lie until things are cleaned up. */ 7652 demangled = NULL; 7653 } 7654 else 7655 { 7656 demangled = cplus_demangle (mangled, 7657 (DMGL_PARAMS | DMGL_ANSI 7658 | (cu->language == language_java 7659 ? DMGL_JAVA | DMGL_RET_POSTFIX 7660 : DMGL_RET_DROP))); 7661 } 7662 if (demangled) 7663 { 7664 make_cleanup (xfree, demangled); 7665 canon = demangled; 7666 } 7667 else 7668 { 7669 canon = mangled; 7670 need_copy = 0; 7671 } 7672 } 7673 7674 if (canon == NULL || check_physname) 7675 { 7676 const char *physname = dwarf2_compute_name (name, die, cu, 1); 7677 7678 if (canon != NULL && strcmp (physname, canon) != 0) 7679 { 7680 /* It may not mean a bug in GDB. The compiler could also 7681 compute DW_AT_linkage_name incorrectly. But in such case 7682 GDB would need to be bug-to-bug compatible. */ 7683 7684 complaint (&symfile_complaints, 7685 _("Computed physname <%s> does not match demangled <%s> " 7686 "(from linkage <%s>) - DIE at 0x%x [in module %s]"), 7687 physname, canon, mangled, die->offset.sect_off, objfile->name); 7688 7689 /* Prefer DW_AT_linkage_name (in the CANON form) - when it 7690 is available here - over computed PHYSNAME. It is safer 7691 against both buggy GDB and buggy compilers. */ 7692 7693 retval = canon; 7694 } 7695 else 7696 { 7697 retval = physname; 7698 need_copy = 0; 7699 } 7700 } 7701 else 7702 retval = canon; 7703 7704 if (need_copy) 7705 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval)); 7706 7707 do_cleanups (back_to); 7708 return retval; 7709 } 7710 7711 /* Read the import statement specified by the given die and record it. */ 7712 7713 static void 7714 read_import_statement (struct die_info *die, struct dwarf2_cu *cu) 7715 { 7716 struct objfile *objfile = cu->objfile; 7717 struct attribute *import_attr; 7718 struct die_info *imported_die, *child_die; 7719 struct dwarf2_cu *imported_cu; 7720 const char *imported_name; 7721 const char *imported_name_prefix; 7722 const char *canonical_name; 7723 const char *import_alias; 7724 const char *imported_declaration = NULL; 7725 const char *import_prefix; 7726 VEC (const_char_ptr) *excludes = NULL; 7727 struct cleanup *cleanups; 7728 7729 import_attr = dwarf2_attr (die, DW_AT_import, cu); 7730 if (import_attr == NULL) 7731 { 7732 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"), 7733 dwarf_tag_name (die->tag)); 7734 return; 7735 } 7736 7737 imported_cu = cu; 7738 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu); 7739 imported_name = dwarf2_name (imported_die, imported_cu); 7740 if (imported_name == NULL) 7741 { 7742 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524 7743 7744 The import in the following code: 7745 namespace A 7746 { 7747 typedef int B; 7748 } 7749 7750 int main () 7751 { 7752 using A::B; 7753 B b; 7754 return b; 7755 } 7756 7757 ... 7758 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration) 7759 <52> DW_AT_decl_file : 1 7760 <53> DW_AT_decl_line : 6 7761 <54> DW_AT_import : <0x75> 7762 <2><58>: Abbrev Number: 4 (DW_TAG_typedef) 7763 <59> DW_AT_name : B 7764 <5b> DW_AT_decl_file : 1 7765 <5c> DW_AT_decl_line : 2 7766 <5d> DW_AT_type : <0x6e> 7767 ... 7768 <1><75>: Abbrev Number: 7 (DW_TAG_base_type) 7769 <76> DW_AT_byte_size : 4 7770 <77> DW_AT_encoding : 5 (signed) 7771 7772 imports the wrong die ( 0x75 instead of 0x58 ). 7773 This case will be ignored until the gcc bug is fixed. */ 7774 return; 7775 } 7776 7777 /* Figure out the local name after import. */ 7778 import_alias = dwarf2_name (die, cu); 7779 7780 /* Figure out where the statement is being imported to. */ 7781 import_prefix = determine_prefix (die, cu); 7782 7783 /* Figure out what the scope of the imported die is and prepend it 7784 to the name of the imported die. */ 7785 imported_name_prefix = determine_prefix (imported_die, imported_cu); 7786 7787 if (imported_die->tag != DW_TAG_namespace 7788 && imported_die->tag != DW_TAG_module) 7789 { 7790 imported_declaration = imported_name; 7791 canonical_name = imported_name_prefix; 7792 } 7793 else if (strlen (imported_name_prefix) > 0) 7794 canonical_name = obconcat (&objfile->objfile_obstack, 7795 imported_name_prefix, "::", imported_name, 7796 (char *) NULL); 7797 else 7798 canonical_name = imported_name; 7799 7800 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes); 7801 7802 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran) 7803 for (child_die = die->child; child_die && child_die->tag; 7804 child_die = sibling_die (child_die)) 7805 { 7806 /* DWARF-4: A Fortran use statement with a “rename list” may be 7807 represented by an imported module entry with an import attribute 7808 referring to the module and owned entries corresponding to those 7809 entities that are renamed as part of being imported. */ 7810 7811 if (child_die->tag != DW_TAG_imported_declaration) 7812 { 7813 complaint (&symfile_complaints, 7814 _("child DW_TAG_imported_declaration expected " 7815 "- DIE at 0x%x [in module %s]"), 7816 child_die->offset.sect_off, objfile->name); 7817 continue; 7818 } 7819 7820 import_attr = dwarf2_attr (child_die, DW_AT_import, cu); 7821 if (import_attr == NULL) 7822 { 7823 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"), 7824 dwarf_tag_name (child_die->tag)); 7825 continue; 7826 } 7827 7828 imported_cu = cu; 7829 imported_die = follow_die_ref_or_sig (child_die, import_attr, 7830 &imported_cu); 7831 imported_name = dwarf2_name (imported_die, imported_cu); 7832 if (imported_name == NULL) 7833 { 7834 complaint (&symfile_complaints, 7835 _("child DW_TAG_imported_declaration has unknown " 7836 "imported name - DIE at 0x%x [in module %s]"), 7837 child_die->offset.sect_off, objfile->name); 7838 continue; 7839 } 7840 7841 VEC_safe_push (const_char_ptr, excludes, imported_name); 7842 7843 process_die (child_die, cu); 7844 } 7845 7846 cp_add_using_directive (import_prefix, 7847 canonical_name, 7848 import_alias, 7849 imported_declaration, 7850 excludes, 7851 0, 7852 &objfile->objfile_obstack); 7853 7854 do_cleanups (cleanups); 7855 } 7856 7857 /* Cleanup function for handle_DW_AT_stmt_list. */ 7858 7859 static void 7860 free_cu_line_header (void *arg) 7861 { 7862 struct dwarf2_cu *cu = arg; 7863 7864 free_line_header (cu->line_header); 7865 cu->line_header = NULL; 7866 } 7867 7868 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line 7869 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed 7870 this, it was first present in GCC release 4.3.0. */ 7871 7872 static int 7873 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu) 7874 { 7875 if (!cu->checked_producer) 7876 check_producer (cu); 7877 7878 return cu->producer_is_gcc_lt_4_3; 7879 } 7880 7881 static void 7882 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu, 7883 const char **name, const char **comp_dir) 7884 { 7885 struct attribute *attr; 7886 7887 *name = NULL; 7888 *comp_dir = NULL; 7889 7890 /* Find the filename. Do not use dwarf2_name here, since the filename 7891 is not a source language identifier. */ 7892 attr = dwarf2_attr (die, DW_AT_name, cu); 7893 if (attr) 7894 { 7895 *name = DW_STRING (attr); 7896 } 7897 7898 attr = dwarf2_attr (die, DW_AT_comp_dir, cu); 7899 if (attr) 7900 *comp_dir = DW_STRING (attr); 7901 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL 7902 && IS_ABSOLUTE_PATH (*name)) 7903 { 7904 char *d = ldirname (*name); 7905 7906 *comp_dir = d; 7907 if (d != NULL) 7908 make_cleanup (xfree, d); 7909 } 7910 if (*comp_dir != NULL) 7911 { 7912 /* Irix 6.2 native cc prepends <machine>.: to the compilation 7913 directory, get rid of it. */ 7914 char *cp = strchr (*comp_dir, ':'); 7915 7916 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/') 7917 *comp_dir = cp + 1; 7918 } 7919 7920 if (*name == NULL) 7921 *name = "<unknown>"; 7922 } 7923 7924 /* Handle DW_AT_stmt_list for a compilation unit. 7925 DIE is the DW_TAG_compile_unit die for CU. 7926 COMP_DIR is the compilation directory. 7927 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */ 7928 7929 static void 7930 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu, 7931 const char *comp_dir) 7932 { 7933 struct attribute *attr; 7934 7935 gdb_assert (! cu->per_cu->is_debug_types); 7936 7937 attr = dwarf2_attr (die, DW_AT_stmt_list, cu); 7938 if (attr) 7939 { 7940 unsigned int line_offset = DW_UNSND (attr); 7941 struct line_header *line_header 7942 = dwarf_decode_line_header (line_offset, cu); 7943 7944 if (line_header) 7945 { 7946 cu->line_header = line_header; 7947 make_cleanup (free_cu_line_header, cu); 7948 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1); 7949 } 7950 } 7951 } 7952 7953 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */ 7954 7955 static void 7956 read_file_scope (struct die_info *die, struct dwarf2_cu *cu) 7957 { 7958 struct objfile *objfile = dwarf2_per_objfile->objfile; 7959 struct cleanup *back_to = make_cleanup (null_cleanup, 0); 7960 CORE_ADDR lowpc = ((CORE_ADDR) -1); 7961 CORE_ADDR highpc = ((CORE_ADDR) 0); 7962 struct attribute *attr; 7963 const char *name = NULL; 7964 const char *comp_dir = NULL; 7965 struct die_info *child_die; 7966 bfd *abfd = objfile->obfd; 7967 CORE_ADDR baseaddr; 7968 7969 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 7970 7971 get_scope_pc_bounds (die, &lowpc, &highpc, cu); 7972 7973 /* If we didn't find a lowpc, set it to highpc to avoid complaints 7974 from finish_block. */ 7975 if (lowpc == ((CORE_ADDR) -1)) 7976 lowpc = highpc; 7977 lowpc += baseaddr; 7978 highpc += baseaddr; 7979 7980 find_file_and_directory (die, cu, &name, &comp_dir); 7981 7982 prepare_one_comp_unit (cu, die, cu->language); 7983 7984 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not 7985 standardised yet. As a workaround for the language detection we fall 7986 back to the DW_AT_producer string. */ 7987 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL) 7988 cu->language = language_opencl; 7989 7990 /* Similar hack for Go. */ 7991 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL) 7992 set_cu_language (DW_LANG_Go, cu); 7993 7994 dwarf2_start_symtab (cu, name, comp_dir, lowpc); 7995 7996 /* Decode line number information if present. We do this before 7997 processing child DIEs, so that the line header table is available 7998 for DW_AT_decl_file. */ 7999 handle_DW_AT_stmt_list (die, cu, comp_dir); 8000 8001 /* Process all dies in compilation unit. */ 8002 if (die->child != NULL) 8003 { 8004 child_die = die->child; 8005 while (child_die && child_die->tag) 8006 { 8007 process_die (child_die, cu); 8008 child_die = sibling_die (child_die); 8009 } 8010 } 8011 8012 /* Decode macro information, if present. Dwarf 2 macro information 8013 refers to information in the line number info statement program 8014 header, so we can only read it if we've read the header 8015 successfully. */ 8016 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu); 8017 if (attr && cu->line_header) 8018 { 8019 if (dwarf2_attr (die, DW_AT_macro_info, cu)) 8020 complaint (&symfile_complaints, 8021 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info")); 8022 8023 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1); 8024 } 8025 else 8026 { 8027 attr = dwarf2_attr (die, DW_AT_macro_info, cu); 8028 if (attr && cu->line_header) 8029 { 8030 unsigned int macro_offset = DW_UNSND (attr); 8031 8032 dwarf_decode_macros (cu, macro_offset, comp_dir, 0); 8033 } 8034 } 8035 8036 do_cleanups (back_to); 8037 } 8038 8039 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope. 8040 Create the set of symtabs used by this TU, or if this TU is sharing 8041 symtabs with another TU and the symtabs have already been created 8042 then restore those symtabs in the line header. 8043 We don't need the pc/line-number mapping for type units. */ 8044 8045 static void 8046 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu) 8047 { 8048 struct objfile *objfile = dwarf2_per_objfile->objfile; 8049 struct dwarf2_per_cu_data *per_cu = cu->per_cu; 8050 struct type_unit_group *tu_group; 8051 int first_time; 8052 struct line_header *lh; 8053 struct attribute *attr; 8054 unsigned int i, line_offset; 8055 8056 gdb_assert (per_cu->is_debug_types); 8057 8058 attr = dwarf2_attr (die, DW_AT_stmt_list, cu); 8059 8060 /* If we're using .gdb_index (includes -readnow) then 8061 per_cu->s.type_unit_group may not have been set up yet. */ 8062 if (per_cu->type_unit_group == NULL) 8063 per_cu->type_unit_group = get_type_unit_group (cu, attr); 8064 tu_group = per_cu->type_unit_group; 8065 8066 /* If we've already processed this stmt_list there's no real need to 8067 do it again, we could fake it and just recreate the part we need 8068 (file name,index -> symtab mapping). If data shows this optimization 8069 is useful we can do it then. */ 8070 first_time = tu_group->primary_symtab == NULL; 8071 8072 /* We have to handle the case of both a missing DW_AT_stmt_list or bad 8073 debug info. */ 8074 lh = NULL; 8075 if (attr != NULL) 8076 { 8077 line_offset = DW_UNSND (attr); 8078 lh = dwarf_decode_line_header (line_offset, cu); 8079 } 8080 if (lh == NULL) 8081 { 8082 if (first_time) 8083 dwarf2_start_symtab (cu, "", NULL, 0); 8084 else 8085 { 8086 gdb_assert (tu_group->symtabs == NULL); 8087 restart_symtab (0); 8088 } 8089 /* Note: The primary symtab will get allocated at the end. */ 8090 return; 8091 } 8092 8093 cu->line_header = lh; 8094 make_cleanup (free_cu_line_header, cu); 8095 8096 if (first_time) 8097 { 8098 dwarf2_start_symtab (cu, "", NULL, 0); 8099 8100 tu_group->num_symtabs = lh->num_file_names; 8101 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names); 8102 8103 for (i = 0; i < lh->num_file_names; ++i) 8104 { 8105 char *dir = NULL; 8106 struct file_entry *fe = &lh->file_names[i]; 8107 8108 if (fe->dir_index) 8109 dir = lh->include_dirs[fe->dir_index - 1]; 8110 dwarf2_start_subfile (fe->name, dir, NULL); 8111 8112 /* Note: We don't have to watch for the main subfile here, type units 8113 don't have DW_AT_name. */ 8114 8115 if (current_subfile->symtab == NULL) 8116 { 8117 /* NOTE: start_subfile will recognize when it's been passed 8118 a file it has already seen. So we can't assume there's a 8119 simple mapping from lh->file_names to subfiles, 8120 lh->file_names may contain dups. */ 8121 current_subfile->symtab = allocate_symtab (current_subfile->name, 8122 objfile); 8123 } 8124 8125 fe->symtab = current_subfile->symtab; 8126 tu_group->symtabs[i] = fe->symtab; 8127 } 8128 } 8129 else 8130 { 8131 restart_symtab (0); 8132 8133 for (i = 0; i < lh->num_file_names; ++i) 8134 { 8135 struct file_entry *fe = &lh->file_names[i]; 8136 8137 fe->symtab = tu_group->symtabs[i]; 8138 } 8139 } 8140 8141 /* The main symtab is allocated last. Type units don't have DW_AT_name 8142 so they don't have a "real" (so to speak) symtab anyway. 8143 There is later code that will assign the main symtab to all symbols 8144 that don't have one. We need to handle the case of a symbol with a 8145 missing symtab (DW_AT_decl_file) anyway. */ 8146 } 8147 8148 /* Process DW_TAG_type_unit. 8149 For TUs we want to skip the first top level sibling if it's not the 8150 actual type being defined by this TU. In this case the first top 8151 level sibling is there to provide context only. */ 8152 8153 static void 8154 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu) 8155 { 8156 struct die_info *child_die; 8157 8158 prepare_one_comp_unit (cu, die, language_minimal); 8159 8160 /* Initialize (or reinitialize) the machinery for building symtabs. 8161 We do this before processing child DIEs, so that the line header table 8162 is available for DW_AT_decl_file. */ 8163 setup_type_unit_groups (die, cu); 8164 8165 if (die->child != NULL) 8166 { 8167 child_die = die->child; 8168 while (child_die && child_die->tag) 8169 { 8170 process_die (child_die, cu); 8171 child_die = sibling_die (child_die); 8172 } 8173 } 8174 } 8175 8176 /* DWO/DWP files. 8177 8178 http://gcc.gnu.org/wiki/DebugFission 8179 http://gcc.gnu.org/wiki/DebugFissionDWP 8180 8181 To simplify handling of both DWO files ("object" files with the DWARF info) 8182 and DWP files (a file with the DWOs packaged up into one file), we treat 8183 DWP files as having a collection of virtual DWO files. */ 8184 8185 static hashval_t 8186 hash_dwo_file (const void *item) 8187 { 8188 const struct dwo_file *dwo_file = item; 8189 8190 return htab_hash_string (dwo_file->name); 8191 } 8192 8193 static int 8194 eq_dwo_file (const void *item_lhs, const void *item_rhs) 8195 { 8196 const struct dwo_file *lhs = item_lhs; 8197 const struct dwo_file *rhs = item_rhs; 8198 8199 return strcmp (lhs->name, rhs->name) == 0; 8200 } 8201 8202 /* Allocate a hash table for DWO files. */ 8203 8204 static htab_t 8205 allocate_dwo_file_hash_table (void) 8206 { 8207 struct objfile *objfile = dwarf2_per_objfile->objfile; 8208 8209 return htab_create_alloc_ex (41, 8210 hash_dwo_file, 8211 eq_dwo_file, 8212 NULL, 8213 &objfile->objfile_obstack, 8214 hashtab_obstack_allocate, 8215 dummy_obstack_deallocate); 8216 } 8217 8218 /* Lookup DWO file DWO_NAME. */ 8219 8220 static void ** 8221 lookup_dwo_file_slot (const char *dwo_name) 8222 { 8223 struct dwo_file find_entry; 8224 void **slot; 8225 8226 if (dwarf2_per_objfile->dwo_files == NULL) 8227 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table (); 8228 8229 memset (&find_entry, 0, sizeof (find_entry)); 8230 find_entry.name = dwo_name; 8231 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT); 8232 8233 return slot; 8234 } 8235 8236 static hashval_t 8237 hash_dwo_unit (const void *item) 8238 { 8239 const struct dwo_unit *dwo_unit = item; 8240 8241 /* This drops the top 32 bits of the id, but is ok for a hash. */ 8242 return dwo_unit->signature; 8243 } 8244 8245 static int 8246 eq_dwo_unit (const void *item_lhs, const void *item_rhs) 8247 { 8248 const struct dwo_unit *lhs = item_lhs; 8249 const struct dwo_unit *rhs = item_rhs; 8250 8251 /* The signature is assumed to be unique within the DWO file. 8252 So while object file CU dwo_id's always have the value zero, 8253 that's OK, assuming each object file DWO file has only one CU, 8254 and that's the rule for now. */ 8255 return lhs->signature == rhs->signature; 8256 } 8257 8258 /* Allocate a hash table for DWO CUs,TUs. 8259 There is one of these tables for each of CUs,TUs for each DWO file. */ 8260 8261 static htab_t 8262 allocate_dwo_unit_table (struct objfile *objfile) 8263 { 8264 /* Start out with a pretty small number. 8265 Generally DWO files contain only one CU and maybe some TUs. */ 8266 return htab_create_alloc_ex (3, 8267 hash_dwo_unit, 8268 eq_dwo_unit, 8269 NULL, 8270 &objfile->objfile_obstack, 8271 hashtab_obstack_allocate, 8272 dummy_obstack_deallocate); 8273 } 8274 8275 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */ 8276 8277 struct create_dwo_info_table_data 8278 { 8279 struct dwo_file *dwo_file; 8280 htab_t cu_htab; 8281 }; 8282 8283 /* die_reader_func for create_dwo_debug_info_hash_table. */ 8284 8285 static void 8286 create_dwo_debug_info_hash_table_reader (const struct die_reader_specs *reader, 8287 gdb_byte *info_ptr, 8288 struct die_info *comp_unit_die, 8289 int has_children, 8290 void *datap) 8291 { 8292 struct dwarf2_cu *cu = reader->cu; 8293 struct objfile *objfile = dwarf2_per_objfile->objfile; 8294 sect_offset offset = cu->per_cu->offset; 8295 struct dwarf2_section_info *section = cu->per_cu->info_or_types_section; 8296 struct create_dwo_info_table_data *data = datap; 8297 struct dwo_file *dwo_file = data->dwo_file; 8298 htab_t cu_htab = data->cu_htab; 8299 void **slot; 8300 struct attribute *attr; 8301 struct dwo_unit *dwo_unit; 8302 8303 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu); 8304 if (attr == NULL) 8305 { 8306 error (_("Dwarf Error: debug entry at offset 0x%x is missing" 8307 " its dwo_id [in module %s]"), 8308 offset.sect_off, dwo_file->name); 8309 return; 8310 } 8311 8312 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit); 8313 dwo_unit->dwo_file = dwo_file; 8314 dwo_unit->signature = DW_UNSND (attr); 8315 dwo_unit->info_or_types_section = section; 8316 dwo_unit->offset = offset; 8317 dwo_unit->length = cu->per_cu->length; 8318 8319 slot = htab_find_slot (cu_htab, dwo_unit, INSERT); 8320 gdb_assert (slot != NULL); 8321 if (*slot != NULL) 8322 { 8323 const struct dwo_unit *dup_dwo_unit = *slot; 8324 8325 complaint (&symfile_complaints, 8326 _("debug entry at offset 0x%x is duplicate to the entry at" 8327 " offset 0x%x, dwo_id 0x%s [in module %s]"), 8328 offset.sect_off, dup_dwo_unit->offset.sect_off, 8329 phex (dwo_unit->signature, sizeof (dwo_unit->signature)), 8330 dwo_file->name); 8331 } 8332 else 8333 *slot = dwo_unit; 8334 8335 if (dwarf2_read_debug) 8336 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id 0x%s\n", 8337 offset.sect_off, 8338 phex (dwo_unit->signature, 8339 sizeof (dwo_unit->signature))); 8340 } 8341 8342 /* Create a hash table to map DWO IDs to their CU entry in 8343 .debug_info.dwo in DWO_FILE. 8344 Note: This function processes DWO files only, not DWP files. */ 8345 8346 static htab_t 8347 create_dwo_debug_info_hash_table (struct dwo_file *dwo_file) 8348 { 8349 struct objfile *objfile = dwarf2_per_objfile->objfile; 8350 struct dwarf2_section_info *section = &dwo_file->sections.info; 8351 bfd *abfd; 8352 htab_t cu_htab; 8353 gdb_byte *info_ptr, *end_ptr; 8354 struct create_dwo_info_table_data create_dwo_info_table_data; 8355 8356 dwarf2_read_section (objfile, section); 8357 info_ptr = section->buffer; 8358 8359 if (info_ptr == NULL) 8360 return NULL; 8361 8362 /* We can't set abfd until now because the section may be empty or 8363 not present, in which case section->asection will be NULL. */ 8364 abfd = section->asection->owner; 8365 8366 if (dwarf2_read_debug) 8367 fprintf_unfiltered (gdb_stdlog, "Reading .debug_info.dwo for %s:\n", 8368 bfd_get_filename (abfd)); 8369 8370 cu_htab = allocate_dwo_unit_table (objfile); 8371 8372 create_dwo_info_table_data.dwo_file = dwo_file; 8373 create_dwo_info_table_data.cu_htab = cu_htab; 8374 8375 end_ptr = info_ptr + section->size; 8376 while (info_ptr < end_ptr) 8377 { 8378 struct dwarf2_per_cu_data per_cu; 8379 8380 memset (&per_cu, 0, sizeof (per_cu)); 8381 per_cu.objfile = objfile; 8382 per_cu.is_debug_types = 0; 8383 per_cu.offset.sect_off = info_ptr - section->buffer; 8384 per_cu.info_or_types_section = section; 8385 8386 init_cutu_and_read_dies_no_follow (&per_cu, 8387 &dwo_file->sections.abbrev, 8388 dwo_file, 8389 create_dwo_debug_info_hash_table_reader, 8390 &create_dwo_info_table_data); 8391 8392 info_ptr += per_cu.length; 8393 } 8394 8395 return cu_htab; 8396 } 8397 8398 /* DWP file .debug_{cu,tu}_index section format: 8399 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP] 8400 8401 Both index sections have the same format, and serve to map a 64-bit 8402 signature to a set of section numbers. Each section begins with a header, 8403 followed by a hash table of 64-bit signatures, a parallel table of 32-bit 8404 indexes, and a pool of 32-bit section numbers. The index sections will be 8405 aligned at 8-byte boundaries in the file. 8406 8407 The index section header contains two unsigned 32-bit values (using the 8408 byte order of the application binary): 8409 8410 N, the number of compilation units or type units in the index 8411 M, the number of slots in the hash table 8412 8413 (We assume that N and M will not exceed 2^32 - 1.) 8414 8415 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2. 8416 8417 The hash table begins at offset 8 in the section, and consists of an array 8418 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte 8419 order of the application binary). Unused slots in the hash table are 0. 8420 (We rely on the extreme unlikeliness of a signature being exactly 0.) 8421 8422 The parallel table begins immediately after the hash table 8423 (at offset 8 + 8 * M from the beginning of the section), and consists of an 8424 array of 32-bit indexes (using the byte order of the application binary), 8425 corresponding 1-1 with slots in the hash table. Each entry in the parallel 8426 table contains a 32-bit index into the pool of section numbers. For unused 8427 hash table slots, the corresponding entry in the parallel table will be 0. 8428 8429 Given a 64-bit compilation unit signature or a type signature S, an entry 8430 in the hash table is located as follows: 8431 8432 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with 8433 the low-order k bits all set to 1. 8434 8435 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1). 8436 8437 3) If the hash table entry at index H matches the signature, use that 8438 entry. If the hash table entry at index H is unused (all zeroes), 8439 terminate the search: the signature is not present in the table. 8440 8441 4) Let H = (H + H') modulo M. Repeat at Step 3. 8442 8443 Because M > N and H' and M are relatively prime, the search is guaranteed 8444 to stop at an unused slot or find the match. 8445 8446 The pool of section numbers begins immediately following the hash table 8447 (at offset 8 + 12 * M from the beginning of the section). The pool of 8448 section numbers consists of an array of 32-bit words (using the byte order 8449 of the application binary). Each item in the array is indexed starting 8450 from 0. The hash table entry provides the index of the first section 8451 number in the set. Additional section numbers in the set follow, and the 8452 set is terminated by a 0 entry (section number 0 is not used in ELF). 8453 8454 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo 8455 section must be the first entry in the set, and the .debug_abbrev.dwo must 8456 be the second entry. Other members of the set may follow in any order. */ 8457 8458 /* Create a hash table to map DWO IDs to their CU/TU entry in 8459 .debug_{info,types}.dwo in DWP_FILE. 8460 Returns NULL if there isn't one. 8461 Note: This function processes DWP files only, not DWO files. */ 8462 8463 static struct dwp_hash_table * 8464 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types) 8465 { 8466 struct objfile *objfile = dwarf2_per_objfile->objfile; 8467 bfd *dbfd = dwp_file->dbfd; 8468 char *index_ptr, *index_end; 8469 struct dwarf2_section_info *index; 8470 uint32_t version, nr_units, nr_slots; 8471 struct dwp_hash_table *htab; 8472 8473 if (is_debug_types) 8474 index = &dwp_file->sections.tu_index; 8475 else 8476 index = &dwp_file->sections.cu_index; 8477 8478 if (dwarf2_section_empty_p (index)) 8479 return NULL; 8480 dwarf2_read_section (objfile, index); 8481 8482 index_ptr = index->buffer; 8483 index_end = index_ptr + index->size; 8484 8485 version = read_4_bytes (dbfd, index_ptr); 8486 index_ptr += 8; /* Skip the unused word. */ 8487 nr_units = read_4_bytes (dbfd, index_ptr); 8488 index_ptr += 4; 8489 nr_slots = read_4_bytes (dbfd, index_ptr); 8490 index_ptr += 4; 8491 8492 if (version != 1) 8493 { 8494 error (_("Dwarf Error: unsupported DWP file version (%u)" 8495 " [in module %s]"), 8496 version, dwp_file->name); 8497 } 8498 if (nr_slots != (nr_slots & -nr_slots)) 8499 { 8500 error (_("Dwarf Error: number of slots in DWP hash table (%u)" 8501 " is not power of 2 [in module %s]"), 8502 nr_slots, dwp_file->name); 8503 } 8504 8505 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table); 8506 htab->nr_units = nr_units; 8507 htab->nr_slots = nr_slots; 8508 htab->hash_table = index_ptr; 8509 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots; 8510 htab->section_pool = htab->unit_table + sizeof (uint32_t) * nr_slots; 8511 8512 return htab; 8513 } 8514 8515 /* Update SECTIONS with the data from SECTP. 8516 8517 This function is like the other "locate" section routines that are 8518 passed to bfd_map_over_sections, but in this context the sections to 8519 read comes from the DWP hash table, not the full ELF section table. 8520 8521 The result is non-zero for success, or zero if an error was found. */ 8522 8523 static int 8524 locate_virtual_dwo_sections (asection *sectp, 8525 struct virtual_dwo_sections *sections) 8526 { 8527 const struct dwop_section_names *names = &dwop_section_names; 8528 8529 if (section_is_p (sectp->name, &names->abbrev_dwo)) 8530 { 8531 /* There can be only one. */ 8532 if (sections->abbrev.asection != NULL) 8533 return 0; 8534 sections->abbrev.asection = sectp; 8535 sections->abbrev.size = bfd_get_section_size (sectp); 8536 } 8537 else if (section_is_p (sectp->name, &names->info_dwo) 8538 || section_is_p (sectp->name, &names->types_dwo)) 8539 { 8540 /* There can be only one. */ 8541 if (sections->info_or_types.asection != NULL) 8542 return 0; 8543 sections->info_or_types.asection = sectp; 8544 sections->info_or_types.size = bfd_get_section_size (sectp); 8545 } 8546 else if (section_is_p (sectp->name, &names->line_dwo)) 8547 { 8548 /* There can be only one. */ 8549 if (sections->line.asection != NULL) 8550 return 0; 8551 sections->line.asection = sectp; 8552 sections->line.size = bfd_get_section_size (sectp); 8553 } 8554 else if (section_is_p (sectp->name, &names->loc_dwo)) 8555 { 8556 /* There can be only one. */ 8557 if (sections->loc.asection != NULL) 8558 return 0; 8559 sections->loc.asection = sectp; 8560 sections->loc.size = bfd_get_section_size (sectp); 8561 } 8562 else if (section_is_p (sectp->name, &names->macinfo_dwo)) 8563 { 8564 /* There can be only one. */ 8565 if (sections->macinfo.asection != NULL) 8566 return 0; 8567 sections->macinfo.asection = sectp; 8568 sections->macinfo.size = bfd_get_section_size (sectp); 8569 } 8570 else if (section_is_p (sectp->name, &names->macro_dwo)) 8571 { 8572 /* There can be only one. */ 8573 if (sections->macro.asection != NULL) 8574 return 0; 8575 sections->macro.asection = sectp; 8576 sections->macro.size = bfd_get_section_size (sectp); 8577 } 8578 else if (section_is_p (sectp->name, &names->str_offsets_dwo)) 8579 { 8580 /* There can be only one. */ 8581 if (sections->str_offsets.asection != NULL) 8582 return 0; 8583 sections->str_offsets.asection = sectp; 8584 sections->str_offsets.size = bfd_get_section_size (sectp); 8585 } 8586 else 8587 { 8588 /* No other kind of section is valid. */ 8589 return 0; 8590 } 8591 8592 return 1; 8593 } 8594 8595 /* Create a dwo_unit object for the DWO with signature SIGNATURE. 8596 HTAB is the hash table from the DWP file. 8597 SECTION_INDEX is the index of the DWO in HTAB. */ 8598 8599 static struct dwo_unit * 8600 create_dwo_in_dwp (struct dwp_file *dwp_file, 8601 const struct dwp_hash_table *htab, 8602 uint32_t section_index, 8603 ULONGEST signature, int is_debug_types) 8604 { 8605 struct objfile *objfile = dwarf2_per_objfile->objfile; 8606 bfd *dbfd = dwp_file->dbfd; 8607 const char *kind = is_debug_types ? "TU" : "CU"; 8608 struct dwo_file *dwo_file; 8609 struct dwo_unit *dwo_unit; 8610 struct virtual_dwo_sections sections; 8611 void **dwo_file_slot; 8612 char *virtual_dwo_name; 8613 struct dwarf2_section_info *cutu; 8614 struct cleanup *cleanups; 8615 int i; 8616 8617 if (dwarf2_read_debug) 8618 { 8619 fprintf_unfiltered (gdb_stdlog, "Reading %s %u/0x%s in DWP file: %s\n", 8620 kind, 8621 section_index, phex (signature, sizeof (signature)), 8622 dwp_file->name); 8623 } 8624 8625 /* Fetch the sections of this DWO. 8626 Put a limit on the number of sections we look for so that bad data 8627 doesn't cause us to loop forever. */ 8628 8629 #define MAX_NR_DWO_SECTIONS \ 8630 (1 /* .debug_info or .debug_types */ \ 8631 + 1 /* .debug_abbrev */ \ 8632 + 1 /* .debug_line */ \ 8633 + 1 /* .debug_loc */ \ 8634 + 1 /* .debug_str_offsets */ \ 8635 + 1 /* .debug_macro */ \ 8636 + 1 /* .debug_macinfo */ \ 8637 + 1 /* trailing zero */) 8638 8639 memset (§ions, 0, sizeof (sections)); 8640 cleanups = make_cleanup (null_cleanup, 0); 8641 8642 for (i = 0; i < MAX_NR_DWO_SECTIONS; ++i) 8643 { 8644 asection *sectp; 8645 uint32_t section_nr = 8646 read_4_bytes (dbfd, 8647 htab->section_pool 8648 + (section_index + i) * sizeof (uint32_t)); 8649 8650 if (section_nr == 0) 8651 break; 8652 if (section_nr >= dwp_file->num_sections) 8653 { 8654 error (_("Dwarf Error: bad DWP hash table, section number too large" 8655 " [in module %s]"), 8656 dwp_file->name); 8657 } 8658 8659 sectp = dwp_file->elf_sections[section_nr]; 8660 if (! locate_virtual_dwo_sections (sectp, §ions)) 8661 { 8662 error (_("Dwarf Error: bad DWP hash table, invalid section found" 8663 " [in module %s]"), 8664 dwp_file->name); 8665 } 8666 } 8667 8668 if (i < 2 8669 || sections.info_or_types.asection == NULL 8670 || sections.abbrev.asection == NULL) 8671 { 8672 error (_("Dwarf Error: bad DWP hash table, missing DWO sections" 8673 " [in module %s]"), 8674 dwp_file->name); 8675 } 8676 if (i == MAX_NR_DWO_SECTIONS) 8677 { 8678 error (_("Dwarf Error: bad DWP hash table, too many DWO sections" 8679 " [in module %s]"), 8680 dwp_file->name); 8681 } 8682 8683 /* It's easier for the rest of the code if we fake a struct dwo_file and 8684 have dwo_unit "live" in that. At least for now. 8685 8686 The DWP file can be made up of a random collection of CUs and TUs. 8687 However, for each CU + set of TUs that came from the same original DWO 8688 file, we want to combine them back into a virtual DWO file to save space 8689 (fewer struct dwo_file objects to allocated). Remember that for really 8690 large apps there can be on the order of 8K CUs and 200K TUs, or more. */ 8691 8692 virtual_dwo_name = 8693 xstrprintf ("virtual-dwo/%d-%d-%d-%d", 8694 sections.abbrev.asection ? sections.abbrev.asection->id : 0, 8695 sections.line.asection ? sections.line.asection->id : 0, 8696 sections.loc.asection ? sections.loc.asection->id : 0, 8697 (sections.str_offsets.asection 8698 ? sections.str_offsets.asection->id 8699 : 0)); 8700 make_cleanup (xfree, virtual_dwo_name); 8701 /* Can we use an existing virtual DWO file? */ 8702 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name); 8703 /* Create one if necessary. */ 8704 if (*dwo_file_slot == NULL) 8705 { 8706 if (dwarf2_read_debug) 8707 { 8708 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n", 8709 virtual_dwo_name); 8710 } 8711 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file); 8712 dwo_file->name = obstack_copy0 (&objfile->objfile_obstack, 8713 virtual_dwo_name, 8714 strlen (virtual_dwo_name)); 8715 dwo_file->sections.abbrev = sections.abbrev; 8716 dwo_file->sections.line = sections.line; 8717 dwo_file->sections.loc = sections.loc; 8718 dwo_file->sections.macinfo = sections.macinfo; 8719 dwo_file->sections.macro = sections.macro; 8720 dwo_file->sections.str_offsets = sections.str_offsets; 8721 /* The "str" section is global to the entire DWP file. */ 8722 dwo_file->sections.str = dwp_file->sections.str; 8723 /* The info or types section is assigned later to dwo_unit, 8724 there's no need to record it in dwo_file. 8725 Also, we can't simply record type sections in dwo_file because 8726 we record a pointer into the vector in dwo_unit. As we collect more 8727 types we'll grow the vector and eventually have to reallocate space 8728 for it, invalidating all the pointers into the current copy. */ 8729 *dwo_file_slot = dwo_file; 8730 } 8731 else 8732 { 8733 if (dwarf2_read_debug) 8734 { 8735 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n", 8736 virtual_dwo_name); 8737 } 8738 dwo_file = *dwo_file_slot; 8739 } 8740 do_cleanups (cleanups); 8741 8742 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit); 8743 dwo_unit->dwo_file = dwo_file; 8744 dwo_unit->signature = signature; 8745 dwo_unit->info_or_types_section = 8746 obstack_alloc (&objfile->objfile_obstack, 8747 sizeof (struct dwarf2_section_info)); 8748 *dwo_unit->info_or_types_section = sections.info_or_types; 8749 /* offset, length, type_offset_in_tu are set later. */ 8750 8751 return dwo_unit; 8752 } 8753 8754 /* Lookup the DWO with SIGNATURE in DWP_FILE. */ 8755 8756 static struct dwo_unit * 8757 lookup_dwo_in_dwp (struct dwp_file *dwp_file, 8758 const struct dwp_hash_table *htab, 8759 ULONGEST signature, int is_debug_types) 8760 { 8761 bfd *dbfd = dwp_file->dbfd; 8762 uint32_t mask = htab->nr_slots - 1; 8763 uint32_t hash = signature & mask; 8764 uint32_t hash2 = ((signature >> 32) & mask) | 1; 8765 unsigned int i; 8766 void **slot; 8767 struct dwo_unit find_dwo_cu, *dwo_cu; 8768 8769 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu)); 8770 find_dwo_cu.signature = signature; 8771 slot = htab_find_slot (dwp_file->loaded_cutus, &find_dwo_cu, INSERT); 8772 8773 if (*slot != NULL) 8774 return *slot; 8775 8776 /* Use a for loop so that we don't loop forever on bad debug info. */ 8777 for (i = 0; i < htab->nr_slots; ++i) 8778 { 8779 ULONGEST signature_in_table; 8780 8781 signature_in_table = 8782 read_8_bytes (dbfd, htab->hash_table + hash * sizeof (uint64_t)); 8783 if (signature_in_table == signature) 8784 { 8785 uint32_t section_index = 8786 read_4_bytes (dbfd, htab->unit_table + hash * sizeof (uint32_t)); 8787 8788 *slot = create_dwo_in_dwp (dwp_file, htab, section_index, 8789 signature, is_debug_types); 8790 return *slot; 8791 } 8792 if (signature_in_table == 0) 8793 return NULL; 8794 hash = (hash + hash2) & mask; 8795 } 8796 8797 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate" 8798 " [in module %s]"), 8799 dwp_file->name); 8800 } 8801 8802 /* Subroutine of open_dwop_file to simplify it. 8803 Open the file specified by FILE_NAME and hand it off to BFD for 8804 preliminary analysis. Return a newly initialized bfd *, which 8805 includes a canonicalized copy of FILE_NAME. 8806 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file. 8807 In case of trouble, return NULL. 8808 NOTE: This function is derived from symfile_bfd_open. */ 8809 8810 static bfd * 8811 try_open_dwop_file (const char *file_name, int is_dwp) 8812 { 8813 bfd *sym_bfd; 8814 int desc, flags; 8815 char *absolute_name; 8816 8817 flags = OPF_TRY_CWD_FIRST; 8818 if (is_dwp) 8819 flags |= OPF_SEARCH_IN_PATH; 8820 desc = openp (debug_file_directory, flags, file_name, 8821 O_RDONLY | O_BINARY, &absolute_name); 8822 if (desc < 0) 8823 return NULL; 8824 8825 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc); 8826 if (!sym_bfd) 8827 { 8828 xfree (absolute_name); 8829 return NULL; 8830 } 8831 xfree (absolute_name); 8832 bfd_set_cacheable (sym_bfd, 1); 8833 8834 if (!bfd_check_format (sym_bfd, bfd_object)) 8835 { 8836 gdb_bfd_unref (sym_bfd); /* This also closes desc. */ 8837 return NULL; 8838 } 8839 8840 return sym_bfd; 8841 } 8842 8843 /* Try to open DWO/DWP file FILE_NAME. 8844 COMP_DIR is the DW_AT_comp_dir attribute. 8845 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file. 8846 The result is the bfd handle of the file. 8847 If there is a problem finding or opening the file, return NULL. 8848 Upon success, the canonicalized path of the file is stored in the bfd, 8849 same as symfile_bfd_open. */ 8850 8851 static bfd * 8852 open_dwop_file (const char *file_name, const char *comp_dir, int is_dwp) 8853 { 8854 bfd *abfd; 8855 8856 if (IS_ABSOLUTE_PATH (file_name)) 8857 return try_open_dwop_file (file_name, is_dwp); 8858 8859 /* Before trying the search path, try DWO_NAME in COMP_DIR. */ 8860 8861 if (comp_dir != NULL) 8862 { 8863 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL); 8864 8865 /* NOTE: If comp_dir is a relative path, this will also try the 8866 search path, which seems useful. */ 8867 abfd = try_open_dwop_file (path_to_try, is_dwp); 8868 xfree (path_to_try); 8869 if (abfd != NULL) 8870 return abfd; 8871 } 8872 8873 /* That didn't work, try debug-file-directory, which, despite its name, 8874 is a list of paths. */ 8875 8876 if (*debug_file_directory == '\0') 8877 return NULL; 8878 8879 return try_open_dwop_file (file_name, is_dwp); 8880 } 8881 8882 /* This function is mapped across the sections and remembers the offset and 8883 size of each of the DWO debugging sections we are interested in. */ 8884 8885 static void 8886 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr) 8887 { 8888 struct dwo_sections *dwo_sections = dwo_sections_ptr; 8889 const struct dwop_section_names *names = &dwop_section_names; 8890 8891 if (section_is_p (sectp->name, &names->abbrev_dwo)) 8892 { 8893 dwo_sections->abbrev.asection = sectp; 8894 dwo_sections->abbrev.size = bfd_get_section_size (sectp); 8895 } 8896 else if (section_is_p (sectp->name, &names->info_dwo)) 8897 { 8898 dwo_sections->info.asection = sectp; 8899 dwo_sections->info.size = bfd_get_section_size (sectp); 8900 } 8901 else if (section_is_p (sectp->name, &names->line_dwo)) 8902 { 8903 dwo_sections->line.asection = sectp; 8904 dwo_sections->line.size = bfd_get_section_size (sectp); 8905 } 8906 else if (section_is_p (sectp->name, &names->loc_dwo)) 8907 { 8908 dwo_sections->loc.asection = sectp; 8909 dwo_sections->loc.size = bfd_get_section_size (sectp); 8910 } 8911 else if (section_is_p (sectp->name, &names->macinfo_dwo)) 8912 { 8913 dwo_sections->macinfo.asection = sectp; 8914 dwo_sections->macinfo.size = bfd_get_section_size (sectp); 8915 } 8916 else if (section_is_p (sectp->name, &names->macro_dwo)) 8917 { 8918 dwo_sections->macro.asection = sectp; 8919 dwo_sections->macro.size = bfd_get_section_size (sectp); 8920 } 8921 else if (section_is_p (sectp->name, &names->str_dwo)) 8922 { 8923 dwo_sections->str.asection = sectp; 8924 dwo_sections->str.size = bfd_get_section_size (sectp); 8925 } 8926 else if (section_is_p (sectp->name, &names->str_offsets_dwo)) 8927 { 8928 dwo_sections->str_offsets.asection = sectp; 8929 dwo_sections->str_offsets.size = bfd_get_section_size (sectp); 8930 } 8931 else if (section_is_p (sectp->name, &names->types_dwo)) 8932 { 8933 struct dwarf2_section_info type_section; 8934 8935 memset (&type_section, 0, sizeof (type_section)); 8936 type_section.asection = sectp; 8937 type_section.size = bfd_get_section_size (sectp); 8938 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types, 8939 &type_section); 8940 } 8941 } 8942 8943 /* Initialize the use of the DWO file specified by DWO_NAME. 8944 The result is NULL if DWO_NAME can't be found. */ 8945 8946 static struct dwo_file * 8947 open_and_init_dwo_file (const char *dwo_name, const char *comp_dir) 8948 { 8949 struct objfile *objfile = dwarf2_per_objfile->objfile; 8950 struct dwo_file *dwo_file; 8951 bfd *dbfd; 8952 struct cleanup *cleanups; 8953 8954 dbfd = open_dwop_file (dwo_name, comp_dir, 0); 8955 if (dbfd == NULL) 8956 { 8957 if (dwarf2_read_debug) 8958 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name); 8959 return NULL; 8960 } 8961 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file); 8962 dwo_file->name = obstack_copy0 (&objfile->objfile_obstack, 8963 dwo_name, strlen (dwo_name)); 8964 dwo_file->dbfd = dbfd; 8965 8966 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file); 8967 8968 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections); 8969 8970 dwo_file->cus = create_dwo_debug_info_hash_table (dwo_file); 8971 8972 dwo_file->tus = create_debug_types_hash_table (dwo_file, 8973 dwo_file->sections.types); 8974 8975 discard_cleanups (cleanups); 8976 8977 if (dwarf2_read_debug) 8978 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name); 8979 8980 return dwo_file; 8981 } 8982 8983 /* This function is mapped across the sections and remembers the offset and 8984 size of each of the DWP debugging sections we are interested in. */ 8985 8986 static void 8987 dwarf2_locate_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr) 8988 { 8989 struct dwp_file *dwp_file = dwp_file_ptr; 8990 const struct dwop_section_names *names = &dwop_section_names; 8991 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx; 8992 8993 /* Record the ELF section number for later lookup: this is what the 8994 .debug_cu_index,.debug_tu_index tables use. */ 8995 gdb_assert (elf_section_nr < dwp_file->num_sections); 8996 dwp_file->elf_sections[elf_section_nr] = sectp; 8997 8998 /* Look for specific sections that we need. */ 8999 if (section_is_p (sectp->name, &names->str_dwo)) 9000 { 9001 dwp_file->sections.str.asection = sectp; 9002 dwp_file->sections.str.size = bfd_get_section_size (sectp); 9003 } 9004 else if (section_is_p (sectp->name, &names->cu_index)) 9005 { 9006 dwp_file->sections.cu_index.asection = sectp; 9007 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp); 9008 } 9009 else if (section_is_p (sectp->name, &names->tu_index)) 9010 { 9011 dwp_file->sections.tu_index.asection = sectp; 9012 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp); 9013 } 9014 } 9015 9016 /* Hash function for dwp_file loaded CUs/TUs. */ 9017 9018 static hashval_t 9019 hash_dwp_loaded_cutus (const void *item) 9020 { 9021 const struct dwo_unit *dwo_unit = item; 9022 9023 /* This drops the top 32 bits of the signature, but is ok for a hash. */ 9024 return dwo_unit->signature; 9025 } 9026 9027 /* Equality function for dwp_file loaded CUs/TUs. */ 9028 9029 static int 9030 eq_dwp_loaded_cutus (const void *a, const void *b) 9031 { 9032 const struct dwo_unit *dua = a; 9033 const struct dwo_unit *dub = b; 9034 9035 return dua->signature == dub->signature; 9036 } 9037 9038 /* Allocate a hash table for dwp_file loaded CUs/TUs. */ 9039 9040 static htab_t 9041 allocate_dwp_loaded_cutus_table (struct objfile *objfile) 9042 { 9043 return htab_create_alloc_ex (3, 9044 hash_dwp_loaded_cutus, 9045 eq_dwp_loaded_cutus, 9046 NULL, 9047 &objfile->objfile_obstack, 9048 hashtab_obstack_allocate, 9049 dummy_obstack_deallocate); 9050 } 9051 9052 /* Initialize the use of the DWP file for the current objfile. 9053 By convention the name of the DWP file is ${objfile}.dwp. 9054 The result is NULL if it can't be found. */ 9055 9056 static struct dwp_file * 9057 open_and_init_dwp_file (const char *comp_dir) 9058 { 9059 struct objfile *objfile = dwarf2_per_objfile->objfile; 9060 struct dwp_file *dwp_file; 9061 char *dwp_name; 9062 bfd *dbfd; 9063 struct cleanup *cleanups; 9064 9065 dwp_name = xstrprintf ("%s.dwp", dwarf2_per_objfile->objfile->name); 9066 cleanups = make_cleanup (xfree, dwp_name); 9067 9068 dbfd = open_dwop_file (dwp_name, comp_dir, 1); 9069 if (dbfd == NULL) 9070 { 9071 if (dwarf2_read_debug) 9072 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name); 9073 do_cleanups (cleanups); 9074 return NULL; 9075 } 9076 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file); 9077 dwp_file->name = obstack_copy0 (&objfile->objfile_obstack, 9078 dwp_name, strlen (dwp_name)); 9079 dwp_file->dbfd = dbfd; 9080 do_cleanups (cleanups); 9081 9082 /* +1: section 0 is unused */ 9083 dwp_file->num_sections = bfd_count_sections (dbfd) + 1; 9084 dwp_file->elf_sections = 9085 OBSTACK_CALLOC (&objfile->objfile_obstack, 9086 dwp_file->num_sections, asection *); 9087 9088 bfd_map_over_sections (dbfd, dwarf2_locate_dwp_sections, dwp_file); 9089 9090 dwp_file->cus = create_dwp_hash_table (dwp_file, 0); 9091 9092 dwp_file->tus = create_dwp_hash_table (dwp_file, 1); 9093 9094 dwp_file->loaded_cutus = allocate_dwp_loaded_cutus_table (objfile); 9095 9096 if (dwarf2_read_debug) 9097 { 9098 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name); 9099 fprintf_unfiltered (gdb_stdlog, 9100 " %u CUs, %u TUs\n", 9101 dwp_file->cus ? dwp_file->cus->nr_units : 0, 9102 dwp_file->tus ? dwp_file->tus->nr_units : 0); 9103 } 9104 9105 return dwp_file; 9106 } 9107 9108 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit. 9109 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME 9110 or in the DWP file for the objfile, referenced by THIS_UNIT. 9111 If non-NULL, comp_dir is the DW_AT_comp_dir attribute. 9112 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU. 9113 9114 This is called, for example, when wanting to read a variable with a 9115 complex location. Therefore we don't want to do file i/o for every call. 9116 Therefore we don't want to look for a DWO file on every call. 9117 Therefore we first see if we've already seen SIGNATURE in a DWP file, 9118 then we check if we've already seen DWO_NAME, and only THEN do we check 9119 for a DWO file. 9120 9121 The result is a pointer to the dwo_unit object or NULL if we didn't find it 9122 (dwo_id mismatch or couldn't find the DWO/DWP file). */ 9123 9124 static struct dwo_unit * 9125 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit, 9126 const char *dwo_name, const char *comp_dir, 9127 ULONGEST signature, int is_debug_types) 9128 { 9129 struct objfile *objfile = dwarf2_per_objfile->objfile; 9130 const char *kind = is_debug_types ? "TU" : "CU"; 9131 void **dwo_file_slot; 9132 struct dwo_file *dwo_file; 9133 struct dwp_file *dwp_file; 9134 9135 /* Have we already read SIGNATURE from a DWP file? */ 9136 9137 if (! dwarf2_per_objfile->dwp_checked) 9138 { 9139 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file (comp_dir); 9140 dwarf2_per_objfile->dwp_checked = 1; 9141 } 9142 dwp_file = dwarf2_per_objfile->dwp_file; 9143 9144 if (dwp_file != NULL) 9145 { 9146 const struct dwp_hash_table *dwp_htab = 9147 is_debug_types ? dwp_file->tus : dwp_file->cus; 9148 9149 if (dwp_htab != NULL) 9150 { 9151 struct dwo_unit *dwo_cutu = 9152 lookup_dwo_in_dwp (dwp_file, dwp_htab, signature, is_debug_types); 9153 9154 if (dwo_cutu != NULL) 9155 { 9156 if (dwarf2_read_debug) 9157 { 9158 fprintf_unfiltered (gdb_stdlog, 9159 "Virtual DWO %s %s found: @%s\n", 9160 kind, hex_string (signature), 9161 host_address_to_string (dwo_cutu)); 9162 } 9163 return dwo_cutu; 9164 } 9165 } 9166 } 9167 9168 /* Have we already seen DWO_NAME? */ 9169 9170 dwo_file_slot = lookup_dwo_file_slot (dwo_name); 9171 if (*dwo_file_slot == NULL) 9172 { 9173 /* Read in the file and build a table of the DWOs it contains. */ 9174 *dwo_file_slot = open_and_init_dwo_file (dwo_name, comp_dir); 9175 } 9176 /* NOTE: This will be NULL if unable to open the file. */ 9177 dwo_file = *dwo_file_slot; 9178 9179 if (dwo_file != NULL) 9180 { 9181 htab_t htab = is_debug_types ? dwo_file->tus : dwo_file->cus; 9182 9183 if (htab != NULL) 9184 { 9185 struct dwo_unit find_dwo_cutu, *dwo_cutu; 9186 9187 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu)); 9188 find_dwo_cutu.signature = signature; 9189 dwo_cutu = htab_find (htab, &find_dwo_cutu); 9190 9191 if (dwo_cutu != NULL) 9192 { 9193 if (dwarf2_read_debug) 9194 { 9195 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n", 9196 kind, dwo_name, hex_string (signature), 9197 host_address_to_string (dwo_cutu)); 9198 } 9199 return dwo_cutu; 9200 } 9201 } 9202 } 9203 9204 /* We didn't find it. This could mean a dwo_id mismatch, or 9205 someone deleted the DWO/DWP file, or the search path isn't set up 9206 correctly to find the file. */ 9207 9208 if (dwarf2_read_debug) 9209 { 9210 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n", 9211 kind, dwo_name, hex_string (signature)); 9212 } 9213 9214 complaint (&symfile_complaints, 9215 _("Could not find DWO CU referenced by CU at offset 0x%x" 9216 " [in module %s]"), 9217 this_unit->offset.sect_off, objfile->name); 9218 return NULL; 9219 } 9220 9221 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU. 9222 See lookup_dwo_cutu_unit for details. */ 9223 9224 static struct dwo_unit * 9225 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu, 9226 const char *dwo_name, const char *comp_dir, 9227 ULONGEST signature) 9228 { 9229 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0); 9230 } 9231 9232 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU. 9233 See lookup_dwo_cutu_unit for details. */ 9234 9235 static struct dwo_unit * 9236 lookup_dwo_type_unit (struct signatured_type *this_tu, 9237 const char *dwo_name, const char *comp_dir) 9238 { 9239 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1); 9240 } 9241 9242 /* Free all resources associated with DWO_FILE. 9243 Close the DWO file and munmap the sections. 9244 All memory should be on the objfile obstack. */ 9245 9246 static void 9247 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile) 9248 { 9249 int ix; 9250 struct dwarf2_section_info *section; 9251 9252 /* Note: dbfd is NULL for virtual DWO files. */ 9253 gdb_bfd_unref (dwo_file->dbfd); 9254 9255 VEC_free (dwarf2_section_info_def, dwo_file->sections.types); 9256 } 9257 9258 /* Wrapper for free_dwo_file for use in cleanups. */ 9259 9260 static void 9261 free_dwo_file_cleanup (void *arg) 9262 { 9263 struct dwo_file *dwo_file = (struct dwo_file *) arg; 9264 struct objfile *objfile = dwarf2_per_objfile->objfile; 9265 9266 free_dwo_file (dwo_file, objfile); 9267 } 9268 9269 /* Traversal function for free_dwo_files. */ 9270 9271 static int 9272 free_dwo_file_from_slot (void **slot, void *info) 9273 { 9274 struct dwo_file *dwo_file = (struct dwo_file *) *slot; 9275 struct objfile *objfile = (struct objfile *) info; 9276 9277 free_dwo_file (dwo_file, objfile); 9278 9279 return 1; 9280 } 9281 9282 /* Free all resources associated with DWO_FILES. */ 9283 9284 static void 9285 free_dwo_files (htab_t dwo_files, struct objfile *objfile) 9286 { 9287 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile); 9288 } 9289 9290 /* Read in various DIEs. */ 9291 9292 /* qsort helper for inherit_abstract_dies. */ 9293 9294 static int 9295 unsigned_int_compar (const void *ap, const void *bp) 9296 { 9297 unsigned int a = *(unsigned int *) ap; 9298 unsigned int b = *(unsigned int *) bp; 9299 9300 return (a > b) - (b > a); 9301 } 9302 9303 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes). 9304 Inherit only the children of the DW_AT_abstract_origin DIE not being 9305 already referenced by DW_AT_abstract_origin from the children of the 9306 current DIE. */ 9307 9308 static void 9309 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu) 9310 { 9311 struct die_info *child_die; 9312 unsigned die_children_count; 9313 /* CU offsets which were referenced by children of the current DIE. */ 9314 sect_offset *offsets; 9315 sect_offset *offsets_end, *offsetp; 9316 /* Parent of DIE - referenced by DW_AT_abstract_origin. */ 9317 struct die_info *origin_die; 9318 /* Iterator of the ORIGIN_DIE children. */ 9319 struct die_info *origin_child_die; 9320 struct cleanup *cleanups; 9321 struct attribute *attr; 9322 struct dwarf2_cu *origin_cu; 9323 struct pending **origin_previous_list_in_scope; 9324 9325 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu); 9326 if (!attr) 9327 return; 9328 9329 /* Note that following die references may follow to a die in a 9330 different cu. */ 9331 9332 origin_cu = cu; 9333 origin_die = follow_die_ref (die, attr, &origin_cu); 9334 9335 /* We're inheriting ORIGIN's children into the scope we'd put DIE's 9336 symbols in. */ 9337 origin_previous_list_in_scope = origin_cu->list_in_scope; 9338 origin_cu->list_in_scope = cu->list_in_scope; 9339 9340 if (die->tag != origin_die->tag 9341 && !(die->tag == DW_TAG_inlined_subroutine 9342 && origin_die->tag == DW_TAG_subprogram)) 9343 complaint (&symfile_complaints, 9344 _("DIE 0x%x and its abstract origin 0x%x have different tags"), 9345 die->offset.sect_off, origin_die->offset.sect_off); 9346 9347 child_die = die->child; 9348 die_children_count = 0; 9349 while (child_die && child_die->tag) 9350 { 9351 child_die = sibling_die (child_die); 9352 die_children_count++; 9353 } 9354 offsets = xmalloc (sizeof (*offsets) * die_children_count); 9355 cleanups = make_cleanup (xfree, offsets); 9356 9357 offsets_end = offsets; 9358 child_die = die->child; 9359 while (child_die && child_die->tag) 9360 { 9361 /* For each CHILD_DIE, find the corresponding child of 9362 ORIGIN_DIE. If there is more than one layer of 9363 DW_AT_abstract_origin, follow them all; there shouldn't be, 9364 but GCC versions at least through 4.4 generate this (GCC PR 9365 40573). */ 9366 struct die_info *child_origin_die = child_die; 9367 struct dwarf2_cu *child_origin_cu = cu; 9368 9369 while (1) 9370 { 9371 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin, 9372 child_origin_cu); 9373 if (attr == NULL) 9374 break; 9375 child_origin_die = follow_die_ref (child_origin_die, attr, 9376 &child_origin_cu); 9377 } 9378 9379 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract 9380 counterpart may exist. */ 9381 if (child_origin_die != child_die) 9382 { 9383 if (child_die->tag != child_origin_die->tag 9384 && !(child_die->tag == DW_TAG_inlined_subroutine 9385 && child_origin_die->tag == DW_TAG_subprogram)) 9386 complaint (&symfile_complaints, 9387 _("Child DIE 0x%x and its abstract origin 0x%x have " 9388 "different tags"), child_die->offset.sect_off, 9389 child_origin_die->offset.sect_off); 9390 if (child_origin_die->parent != origin_die) 9391 complaint (&symfile_complaints, 9392 _("Child DIE 0x%x and its abstract origin 0x%x have " 9393 "different parents"), child_die->offset.sect_off, 9394 child_origin_die->offset.sect_off); 9395 else 9396 *offsets_end++ = child_origin_die->offset; 9397 } 9398 child_die = sibling_die (child_die); 9399 } 9400 qsort (offsets, offsets_end - offsets, sizeof (*offsets), 9401 unsigned_int_compar); 9402 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++) 9403 if (offsetp[-1].sect_off == offsetp->sect_off) 9404 complaint (&symfile_complaints, 9405 _("Multiple children of DIE 0x%x refer " 9406 "to DIE 0x%x as their abstract origin"), 9407 die->offset.sect_off, offsetp->sect_off); 9408 9409 offsetp = offsets; 9410 origin_child_die = origin_die->child; 9411 while (origin_child_die && origin_child_die->tag) 9412 { 9413 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */ 9414 while (offsetp < offsets_end 9415 && offsetp->sect_off < origin_child_die->offset.sect_off) 9416 offsetp++; 9417 if (offsetp >= offsets_end 9418 || offsetp->sect_off > origin_child_die->offset.sect_off) 9419 { 9420 /* Found that ORIGIN_CHILD_DIE is really not referenced. */ 9421 process_die (origin_child_die, origin_cu); 9422 } 9423 origin_child_die = sibling_die (origin_child_die); 9424 } 9425 origin_cu->list_in_scope = origin_previous_list_in_scope; 9426 9427 do_cleanups (cleanups); 9428 } 9429 9430 static void 9431 read_func_scope (struct die_info *die, struct dwarf2_cu *cu) 9432 { 9433 struct objfile *objfile = cu->objfile; 9434 struct context_stack *new; 9435 CORE_ADDR lowpc; 9436 CORE_ADDR highpc; 9437 struct die_info *child_die; 9438 struct attribute *attr, *call_line, *call_file; 9439 const char *name; 9440 CORE_ADDR baseaddr; 9441 struct block *block; 9442 int inlined_func = (die->tag == DW_TAG_inlined_subroutine); 9443 VEC (symbolp) *template_args = NULL; 9444 struct template_symbol *templ_func = NULL; 9445 9446 if (inlined_func) 9447 { 9448 /* If we do not have call site information, we can't show the 9449 caller of this inlined function. That's too confusing, so 9450 only use the scope for local variables. */ 9451 call_line = dwarf2_attr (die, DW_AT_call_line, cu); 9452 call_file = dwarf2_attr (die, DW_AT_call_file, cu); 9453 if (call_line == NULL || call_file == NULL) 9454 { 9455 read_lexical_block_scope (die, cu); 9456 return; 9457 } 9458 } 9459 9460 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 9461 9462 name = dwarf2_name (die, cu); 9463 9464 /* Ignore functions with missing or empty names. These are actually 9465 illegal according to the DWARF standard. */ 9466 if (name == NULL) 9467 { 9468 complaint (&symfile_complaints, 9469 _("missing name for subprogram DIE at %d"), 9470 die->offset.sect_off); 9471 return; 9472 } 9473 9474 /* Ignore functions with missing or invalid low and high pc attributes. */ 9475 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)) 9476 { 9477 attr = dwarf2_attr (die, DW_AT_external, cu); 9478 if (!attr || !DW_UNSND (attr)) 9479 complaint (&symfile_complaints, 9480 _("cannot get low and high bounds " 9481 "for subprogram DIE at %d"), 9482 die->offset.sect_off); 9483 return; 9484 } 9485 9486 lowpc += baseaddr; 9487 highpc += baseaddr; 9488 9489 /* If we have any template arguments, then we must allocate a 9490 different sort of symbol. */ 9491 for (child_die = die->child; child_die; child_die = sibling_die (child_die)) 9492 { 9493 if (child_die->tag == DW_TAG_template_type_param 9494 || child_die->tag == DW_TAG_template_value_param) 9495 { 9496 templ_func = OBSTACK_ZALLOC (&objfile->objfile_obstack, 9497 struct template_symbol); 9498 templ_func->base.is_cplus_template_function = 1; 9499 break; 9500 } 9501 } 9502 9503 new = push_context (0, lowpc); 9504 new->name = new_symbol_full (die, read_type_die (die, cu), cu, 9505 (struct symbol *) templ_func); 9506 9507 /* If there is a location expression for DW_AT_frame_base, record 9508 it. */ 9509 attr = dwarf2_attr (die, DW_AT_frame_base, cu); 9510 if (attr) 9511 /* FIXME: cagney/2004-01-26: The DW_AT_frame_base's location 9512 expression is being recorded directly in the function's symbol 9513 and not in a separate frame-base object. I guess this hack is 9514 to avoid adding some sort of frame-base adjunct/annex to the 9515 function's symbol :-(. The problem with doing this is that it 9516 results in a function symbol with a location expression that 9517 has nothing to do with the location of the function, ouch! The 9518 relationship should be: a function's symbol has-a frame base; a 9519 frame-base has-a location expression. */ 9520 dwarf2_symbol_mark_computed (attr, new->name, cu); 9521 9522 cu->list_in_scope = &local_symbols; 9523 9524 if (die->child != NULL) 9525 { 9526 child_die = die->child; 9527 while (child_die && child_die->tag) 9528 { 9529 if (child_die->tag == DW_TAG_template_type_param 9530 || child_die->tag == DW_TAG_template_value_param) 9531 { 9532 struct symbol *arg = new_symbol (child_die, NULL, cu); 9533 9534 if (arg != NULL) 9535 VEC_safe_push (symbolp, template_args, arg); 9536 } 9537 else 9538 process_die (child_die, cu); 9539 child_die = sibling_die (child_die); 9540 } 9541 } 9542 9543 inherit_abstract_dies (die, cu); 9544 9545 /* If we have a DW_AT_specification, we might need to import using 9546 directives from the context of the specification DIE. See the 9547 comment in determine_prefix. */ 9548 if (cu->language == language_cplus 9549 && dwarf2_attr (die, DW_AT_specification, cu)) 9550 { 9551 struct dwarf2_cu *spec_cu = cu; 9552 struct die_info *spec_die = die_specification (die, &spec_cu); 9553 9554 while (spec_die) 9555 { 9556 child_die = spec_die->child; 9557 while (child_die && child_die->tag) 9558 { 9559 if (child_die->tag == DW_TAG_imported_module) 9560 process_die (child_die, spec_cu); 9561 child_die = sibling_die (child_die); 9562 } 9563 9564 /* In some cases, GCC generates specification DIEs that 9565 themselves contain DW_AT_specification attributes. */ 9566 spec_die = die_specification (spec_die, &spec_cu); 9567 } 9568 } 9569 9570 new = pop_context (); 9571 /* Make a block for the local symbols within. */ 9572 block = finish_block (new->name, &local_symbols, new->old_blocks, 9573 lowpc, highpc, objfile); 9574 9575 /* For C++, set the block's scope. */ 9576 if ((cu->language == language_cplus || cu->language == language_fortran) 9577 && cu->processing_has_namespace_info) 9578 block_set_scope (block, determine_prefix (die, cu), 9579 &objfile->objfile_obstack); 9580 9581 /* If we have address ranges, record them. */ 9582 dwarf2_record_block_ranges (die, block, baseaddr, cu); 9583 9584 /* Attach template arguments to function. */ 9585 if (! VEC_empty (symbolp, template_args)) 9586 { 9587 gdb_assert (templ_func != NULL); 9588 9589 templ_func->n_template_arguments = VEC_length (symbolp, template_args); 9590 templ_func->template_arguments 9591 = obstack_alloc (&objfile->objfile_obstack, 9592 (templ_func->n_template_arguments 9593 * sizeof (struct symbol *))); 9594 memcpy (templ_func->template_arguments, 9595 VEC_address (symbolp, template_args), 9596 (templ_func->n_template_arguments * sizeof (struct symbol *))); 9597 VEC_free (symbolp, template_args); 9598 } 9599 9600 /* In C++, we can have functions nested inside functions (e.g., when 9601 a function declares a class that has methods). This means that 9602 when we finish processing a function scope, we may need to go 9603 back to building a containing block's symbol lists. */ 9604 local_symbols = new->locals; 9605 using_directives = new->using_directives; 9606 9607 /* If we've finished processing a top-level function, subsequent 9608 symbols go in the file symbol list. */ 9609 if (outermost_context_p ()) 9610 cu->list_in_scope = &file_symbols; 9611 } 9612 9613 /* Process all the DIES contained within a lexical block scope. Start 9614 a new scope, process the dies, and then close the scope. */ 9615 9616 static void 9617 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu) 9618 { 9619 struct objfile *objfile = cu->objfile; 9620 struct context_stack *new; 9621 CORE_ADDR lowpc, highpc; 9622 struct die_info *child_die; 9623 CORE_ADDR baseaddr; 9624 9625 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 9626 9627 /* Ignore blocks with missing or invalid low and high pc attributes. */ 9628 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges 9629 as multiple lexical blocks? Handling children in a sane way would 9630 be nasty. Might be easier to properly extend generic blocks to 9631 describe ranges. */ 9632 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)) 9633 return; 9634 lowpc += baseaddr; 9635 highpc += baseaddr; 9636 9637 push_context (0, lowpc); 9638 if (die->child != NULL) 9639 { 9640 child_die = die->child; 9641 while (child_die && child_die->tag) 9642 { 9643 process_die (child_die, cu); 9644 child_die = sibling_die (child_die); 9645 } 9646 } 9647 new = pop_context (); 9648 9649 if (local_symbols != NULL || using_directives != NULL) 9650 { 9651 struct block *block 9652 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr, 9653 highpc, objfile); 9654 9655 /* Note that recording ranges after traversing children, as we 9656 do here, means that recording a parent's ranges entails 9657 walking across all its children's ranges as they appear in 9658 the address map, which is quadratic behavior. 9659 9660 It would be nicer to record the parent's ranges before 9661 traversing its children, simply overriding whatever you find 9662 there. But since we don't even decide whether to create a 9663 block until after we've traversed its children, that's hard 9664 to do. */ 9665 dwarf2_record_block_ranges (die, block, baseaddr, cu); 9666 } 9667 local_symbols = new->locals; 9668 using_directives = new->using_directives; 9669 } 9670 9671 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */ 9672 9673 static void 9674 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu) 9675 { 9676 struct objfile *objfile = cu->objfile; 9677 struct gdbarch *gdbarch = get_objfile_arch (objfile); 9678 CORE_ADDR pc, baseaddr; 9679 struct attribute *attr; 9680 struct call_site *call_site, call_site_local; 9681 void **slot; 9682 int nparams; 9683 struct die_info *child_die; 9684 9685 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 9686 9687 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 9688 if (!attr) 9689 { 9690 complaint (&symfile_complaints, 9691 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site " 9692 "DIE 0x%x [in module %s]"), 9693 die->offset.sect_off, objfile->name); 9694 return; 9695 } 9696 pc = DW_ADDR (attr) + baseaddr; 9697 9698 if (cu->call_site_htab == NULL) 9699 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq, 9700 NULL, &objfile->objfile_obstack, 9701 hashtab_obstack_allocate, NULL); 9702 call_site_local.pc = pc; 9703 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT); 9704 if (*slot != NULL) 9705 { 9706 complaint (&symfile_complaints, 9707 _("Duplicate PC %s for DW_TAG_GNU_call_site " 9708 "DIE 0x%x [in module %s]"), 9709 paddress (gdbarch, pc), die->offset.sect_off, objfile->name); 9710 return; 9711 } 9712 9713 /* Count parameters at the caller. */ 9714 9715 nparams = 0; 9716 for (child_die = die->child; child_die && child_die->tag; 9717 child_die = sibling_die (child_die)) 9718 { 9719 if (child_die->tag != DW_TAG_GNU_call_site_parameter) 9720 { 9721 complaint (&symfile_complaints, 9722 _("Tag %d is not DW_TAG_GNU_call_site_parameter in " 9723 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"), 9724 child_die->tag, child_die->offset.sect_off, objfile->name); 9725 continue; 9726 } 9727 9728 nparams++; 9729 } 9730 9731 call_site = obstack_alloc (&objfile->objfile_obstack, 9732 (sizeof (*call_site) 9733 + (sizeof (*call_site->parameter) 9734 * (nparams - 1)))); 9735 *slot = call_site; 9736 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter)); 9737 call_site->pc = pc; 9738 9739 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu)) 9740 { 9741 struct die_info *func_die; 9742 9743 /* Skip also over DW_TAG_inlined_subroutine. */ 9744 for (func_die = die->parent; 9745 func_die && func_die->tag != DW_TAG_subprogram 9746 && func_die->tag != DW_TAG_subroutine_type; 9747 func_die = func_die->parent); 9748 9749 /* DW_AT_GNU_all_call_sites is a superset 9750 of DW_AT_GNU_all_tail_call_sites. */ 9751 if (func_die 9752 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu) 9753 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu)) 9754 { 9755 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is 9756 not complete. But keep CALL_SITE for look ups via call_site_htab, 9757 both the initial caller containing the real return address PC and 9758 the final callee containing the current PC of a chain of tail 9759 calls do not need to have the tail call list complete. But any 9760 function candidate for a virtual tail call frame searched via 9761 TYPE_TAIL_CALL_LIST must have the tail call list complete to be 9762 determined unambiguously. */ 9763 } 9764 else 9765 { 9766 struct type *func_type = NULL; 9767 9768 if (func_die) 9769 func_type = get_die_type (func_die, cu); 9770 if (func_type != NULL) 9771 { 9772 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC); 9773 9774 /* Enlist this call site to the function. */ 9775 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type); 9776 TYPE_TAIL_CALL_LIST (func_type) = call_site; 9777 } 9778 else 9779 complaint (&symfile_complaints, 9780 _("Cannot find function owning DW_TAG_GNU_call_site " 9781 "DIE 0x%x [in module %s]"), 9782 die->offset.sect_off, objfile->name); 9783 } 9784 } 9785 9786 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu); 9787 if (attr == NULL) 9788 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu); 9789 SET_FIELD_DWARF_BLOCK (call_site->target, NULL); 9790 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)) 9791 /* Keep NULL DWARF_BLOCK. */; 9792 else if (attr_form_is_block (attr)) 9793 { 9794 struct dwarf2_locexpr_baton *dlbaton; 9795 9796 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton)); 9797 dlbaton->data = DW_BLOCK (attr)->data; 9798 dlbaton->size = DW_BLOCK (attr)->size; 9799 dlbaton->per_cu = cu->per_cu; 9800 9801 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton); 9802 } 9803 else if (is_ref_attr (attr)) 9804 { 9805 struct dwarf2_cu *target_cu = cu; 9806 struct die_info *target_die; 9807 9808 target_die = follow_die_ref_or_sig (die, attr, &target_cu); 9809 gdb_assert (target_cu->objfile == objfile); 9810 if (die_is_declaration (target_die, target_cu)) 9811 { 9812 const char *target_physname = NULL; 9813 struct attribute *target_attr; 9814 9815 /* Prefer the mangled name; otherwise compute the demangled one. */ 9816 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu); 9817 if (target_attr == NULL) 9818 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name, 9819 target_cu); 9820 if (target_attr != NULL && DW_STRING (target_attr) != NULL) 9821 target_physname = DW_STRING (target_attr); 9822 else 9823 target_physname = dwarf2_physname (NULL, target_die, target_cu); 9824 if (target_physname == NULL) 9825 complaint (&symfile_complaints, 9826 _("DW_AT_GNU_call_site_target target DIE has invalid " 9827 "physname, for referencing DIE 0x%x [in module %s]"), 9828 die->offset.sect_off, objfile->name); 9829 else 9830 SET_FIELD_PHYSNAME (call_site->target, target_physname); 9831 } 9832 else 9833 { 9834 CORE_ADDR lowpc; 9835 9836 /* DW_AT_entry_pc should be preferred. */ 9837 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)) 9838 complaint (&symfile_complaints, 9839 _("DW_AT_GNU_call_site_target target DIE has invalid " 9840 "low pc, for referencing DIE 0x%x [in module %s]"), 9841 die->offset.sect_off, objfile->name); 9842 else 9843 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr); 9844 } 9845 } 9846 else 9847 complaint (&symfile_complaints, 9848 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither " 9849 "block nor reference, for DIE 0x%x [in module %s]"), 9850 die->offset.sect_off, objfile->name); 9851 9852 call_site->per_cu = cu->per_cu; 9853 9854 for (child_die = die->child; 9855 child_die && child_die->tag; 9856 child_die = sibling_die (child_die)) 9857 { 9858 struct call_site_parameter *parameter; 9859 struct attribute *loc, *origin; 9860 9861 if (child_die->tag != DW_TAG_GNU_call_site_parameter) 9862 { 9863 /* Already printed the complaint above. */ 9864 continue; 9865 } 9866 9867 gdb_assert (call_site->parameter_count < nparams); 9868 parameter = &call_site->parameter[call_site->parameter_count]; 9869 9870 /* DW_AT_location specifies the register number or DW_AT_abstract_origin 9871 specifies DW_TAG_formal_parameter. Value of the data assumed for the 9872 register is contained in DW_AT_GNU_call_site_value. */ 9873 9874 loc = dwarf2_attr (child_die, DW_AT_location, cu); 9875 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu); 9876 if (loc == NULL && origin != NULL && is_ref_attr (origin)) 9877 { 9878 sect_offset offset; 9879 9880 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET; 9881 offset = dwarf2_get_ref_die_offset (origin); 9882 if (!offset_in_cu_p (&cu->header, offset)) 9883 { 9884 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this 9885 binding can be done only inside one CU. Such referenced DIE 9886 therefore cannot be even moved to DW_TAG_partial_unit. */ 9887 complaint (&symfile_complaints, 9888 _("DW_AT_abstract_origin offset is not in CU for " 9889 "DW_TAG_GNU_call_site child DIE 0x%x " 9890 "[in module %s]"), 9891 child_die->offset.sect_off, objfile->name); 9892 continue; 9893 } 9894 parameter->u.param_offset.cu_off = (offset.sect_off 9895 - cu->header.offset.sect_off); 9896 } 9897 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc)) 9898 { 9899 complaint (&symfile_complaints, 9900 _("No DW_FORM_block* DW_AT_location for " 9901 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"), 9902 child_die->offset.sect_off, objfile->name); 9903 continue; 9904 } 9905 else 9906 { 9907 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg 9908 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]); 9909 if (parameter->u.dwarf_reg != -1) 9910 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG; 9911 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data, 9912 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size], 9913 ¶meter->u.fb_offset)) 9914 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET; 9915 else 9916 { 9917 complaint (&symfile_complaints, 9918 _("Only single DW_OP_reg or DW_OP_fbreg is supported " 9919 "for DW_FORM_block* DW_AT_location is supported for " 9920 "DW_TAG_GNU_call_site child DIE 0x%x " 9921 "[in module %s]"), 9922 child_die->offset.sect_off, objfile->name); 9923 continue; 9924 } 9925 } 9926 9927 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu); 9928 if (!attr_form_is_block (attr)) 9929 { 9930 complaint (&symfile_complaints, 9931 _("No DW_FORM_block* DW_AT_GNU_call_site_value for " 9932 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"), 9933 child_die->offset.sect_off, objfile->name); 9934 continue; 9935 } 9936 parameter->value = DW_BLOCK (attr)->data; 9937 parameter->value_size = DW_BLOCK (attr)->size; 9938 9939 /* Parameters are not pre-cleared by memset above. */ 9940 parameter->data_value = NULL; 9941 parameter->data_value_size = 0; 9942 call_site->parameter_count++; 9943 9944 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu); 9945 if (attr) 9946 { 9947 if (!attr_form_is_block (attr)) 9948 complaint (&symfile_complaints, 9949 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for " 9950 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"), 9951 child_die->offset.sect_off, objfile->name); 9952 else 9953 { 9954 parameter->data_value = DW_BLOCK (attr)->data; 9955 parameter->data_value_size = DW_BLOCK (attr)->size; 9956 } 9957 } 9958 } 9959 } 9960 9961 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET. 9962 Return 1 if the attributes are present and valid, otherwise, return 0. 9963 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */ 9964 9965 static int 9966 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return, 9967 CORE_ADDR *high_return, struct dwarf2_cu *cu, 9968 struct partial_symtab *ranges_pst) 9969 { 9970 struct objfile *objfile = cu->objfile; 9971 struct comp_unit_head *cu_header = &cu->header; 9972 bfd *obfd = objfile->obfd; 9973 unsigned int addr_size = cu_header->addr_size; 9974 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); 9975 /* Base address selection entry. */ 9976 CORE_ADDR base; 9977 int found_base; 9978 unsigned int dummy; 9979 gdb_byte *buffer; 9980 CORE_ADDR marker; 9981 int low_set; 9982 CORE_ADDR low = 0; 9983 CORE_ADDR high = 0; 9984 CORE_ADDR baseaddr; 9985 9986 found_base = cu->base_known; 9987 base = cu->base_address; 9988 9989 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges); 9990 if (offset >= dwarf2_per_objfile->ranges.size) 9991 { 9992 complaint (&symfile_complaints, 9993 _("Offset %d out of bounds for DW_AT_ranges attribute"), 9994 offset); 9995 return 0; 9996 } 9997 buffer = dwarf2_per_objfile->ranges.buffer + offset; 9998 9999 /* Read in the largest possible address. */ 10000 marker = read_address (obfd, buffer, cu, &dummy); 10001 if ((marker & mask) == mask) 10002 { 10003 /* If we found the largest possible address, then 10004 read the base address. */ 10005 base = read_address (obfd, buffer + addr_size, cu, &dummy); 10006 buffer += 2 * addr_size; 10007 offset += 2 * addr_size; 10008 found_base = 1; 10009 } 10010 10011 low_set = 0; 10012 10013 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 10014 10015 while (1) 10016 { 10017 CORE_ADDR range_beginning, range_end; 10018 10019 range_beginning = read_address (obfd, buffer, cu, &dummy); 10020 buffer += addr_size; 10021 range_end = read_address (obfd, buffer, cu, &dummy); 10022 buffer += addr_size; 10023 offset += 2 * addr_size; 10024 10025 /* An end of list marker is a pair of zero addresses. */ 10026 if (range_beginning == 0 && range_end == 0) 10027 /* Found the end of list entry. */ 10028 break; 10029 10030 /* Each base address selection entry is a pair of 2 values. 10031 The first is the largest possible address, the second is 10032 the base address. Check for a base address here. */ 10033 if ((range_beginning & mask) == mask) 10034 { 10035 /* If we found the largest possible address, then 10036 read the base address. */ 10037 base = read_address (obfd, buffer + addr_size, cu, &dummy); 10038 found_base = 1; 10039 continue; 10040 } 10041 10042 if (!found_base) 10043 { 10044 /* We have no valid base address for the ranges 10045 data. */ 10046 complaint (&symfile_complaints, 10047 _("Invalid .debug_ranges data (no base address)")); 10048 return 0; 10049 } 10050 10051 if (range_beginning > range_end) 10052 { 10053 /* Inverted range entries are invalid. */ 10054 complaint (&symfile_complaints, 10055 _("Invalid .debug_ranges data (inverted range)")); 10056 return 0; 10057 } 10058 10059 /* Empty range entries have no effect. */ 10060 if (range_beginning == range_end) 10061 continue; 10062 10063 range_beginning += base; 10064 range_end += base; 10065 10066 /* A not-uncommon case of bad debug info. 10067 Don't pollute the addrmap with bad data. */ 10068 if (range_beginning + baseaddr == 0 10069 && !dwarf2_per_objfile->has_section_at_zero) 10070 { 10071 complaint (&symfile_complaints, 10072 _(".debug_ranges entry has start address of zero" 10073 " [in module %s]"), objfile->name); 10074 continue; 10075 } 10076 10077 if (ranges_pst != NULL) 10078 addrmap_set_empty (objfile->psymtabs_addrmap, 10079 range_beginning + baseaddr, 10080 range_end - 1 + baseaddr, 10081 ranges_pst); 10082 10083 /* FIXME: This is recording everything as a low-high 10084 segment of consecutive addresses. We should have a 10085 data structure for discontiguous block ranges 10086 instead. */ 10087 if (! low_set) 10088 { 10089 low = range_beginning; 10090 high = range_end; 10091 low_set = 1; 10092 } 10093 else 10094 { 10095 if (range_beginning < low) 10096 low = range_beginning; 10097 if (range_end > high) 10098 high = range_end; 10099 } 10100 } 10101 10102 if (! low_set) 10103 /* If the first entry is an end-of-list marker, the range 10104 describes an empty scope, i.e. no instructions. */ 10105 return 0; 10106 10107 if (low_return) 10108 *low_return = low; 10109 if (high_return) 10110 *high_return = high; 10111 return 1; 10112 } 10113 10114 /* Get low and high pc attributes from a die. Return 1 if the attributes 10115 are present and valid, otherwise, return 0. Return -1 if the range is 10116 discontinuous, i.e. derived from DW_AT_ranges information. */ 10117 10118 static int 10119 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, 10120 CORE_ADDR *highpc, struct dwarf2_cu *cu, 10121 struct partial_symtab *pst) 10122 { 10123 struct attribute *attr; 10124 struct attribute *attr_high; 10125 CORE_ADDR low = 0; 10126 CORE_ADDR high = 0; 10127 int ret = 0; 10128 10129 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu); 10130 if (attr_high) 10131 { 10132 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 10133 if (attr) 10134 { 10135 low = DW_ADDR (attr); 10136 if (attr_high->form == DW_FORM_addr 10137 || attr_high->form == DW_FORM_GNU_addr_index) 10138 high = DW_ADDR (attr_high); 10139 else 10140 high = low + DW_UNSND (attr_high); 10141 } 10142 else 10143 /* Found high w/o low attribute. */ 10144 return 0; 10145 10146 /* Found consecutive range of addresses. */ 10147 ret = 1; 10148 } 10149 else 10150 { 10151 attr = dwarf2_attr (die, DW_AT_ranges, cu); 10152 if (attr != NULL) 10153 { 10154 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton. 10155 We take advantage of the fact that DW_AT_ranges does not appear 10156 in DW_TAG_compile_unit of DWO files. */ 10157 int need_ranges_base = die->tag != DW_TAG_compile_unit; 10158 unsigned int ranges_offset = (DW_UNSND (attr) 10159 + (need_ranges_base 10160 ? cu->ranges_base 10161 : 0)); 10162 10163 /* Value of the DW_AT_ranges attribute is the offset in the 10164 .debug_ranges section. */ 10165 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst)) 10166 return 0; 10167 /* Found discontinuous range of addresses. */ 10168 ret = -1; 10169 } 10170 } 10171 10172 /* read_partial_die has also the strict LOW < HIGH requirement. */ 10173 if (high <= low) 10174 return 0; 10175 10176 /* When using the GNU linker, .gnu.linkonce. sections are used to 10177 eliminate duplicate copies of functions and vtables and such. 10178 The linker will arbitrarily choose one and discard the others. 10179 The AT_*_pc values for such functions refer to local labels in 10180 these sections. If the section from that file was discarded, the 10181 labels are not in the output, so the relocs get a value of 0. 10182 If this is a discarded function, mark the pc bounds as invalid, 10183 so that GDB will ignore it. */ 10184 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero) 10185 return 0; 10186 10187 *lowpc = low; 10188 if (highpc) 10189 *highpc = high; 10190 return ret; 10191 } 10192 10193 /* Assuming that DIE represents a subprogram DIE or a lexical block, get 10194 its low and high PC addresses. Do nothing if these addresses could not 10195 be determined. Otherwise, set LOWPC to the low address if it is smaller, 10196 and HIGHPC to the high address if greater than HIGHPC. */ 10197 10198 static void 10199 dwarf2_get_subprogram_pc_bounds (struct die_info *die, 10200 CORE_ADDR *lowpc, CORE_ADDR *highpc, 10201 struct dwarf2_cu *cu) 10202 { 10203 CORE_ADDR low, high; 10204 struct die_info *child = die->child; 10205 10206 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL)) 10207 { 10208 *lowpc = min (*lowpc, low); 10209 *highpc = max (*highpc, high); 10210 } 10211 10212 /* If the language does not allow nested subprograms (either inside 10213 subprograms or lexical blocks), we're done. */ 10214 if (cu->language != language_ada) 10215 return; 10216 10217 /* Check all the children of the given DIE. If it contains nested 10218 subprograms, then check their pc bounds. Likewise, we need to 10219 check lexical blocks as well, as they may also contain subprogram 10220 definitions. */ 10221 while (child && child->tag) 10222 { 10223 if (child->tag == DW_TAG_subprogram 10224 || child->tag == DW_TAG_lexical_block) 10225 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu); 10226 child = sibling_die (child); 10227 } 10228 } 10229 10230 /* Get the low and high pc's represented by the scope DIE, and store 10231 them in *LOWPC and *HIGHPC. If the correct values can't be 10232 determined, set *LOWPC to -1 and *HIGHPC to 0. */ 10233 10234 static void 10235 get_scope_pc_bounds (struct die_info *die, 10236 CORE_ADDR *lowpc, CORE_ADDR *highpc, 10237 struct dwarf2_cu *cu) 10238 { 10239 CORE_ADDR best_low = (CORE_ADDR) -1; 10240 CORE_ADDR best_high = (CORE_ADDR) 0; 10241 CORE_ADDR current_low, current_high; 10242 10243 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)) 10244 { 10245 best_low = current_low; 10246 best_high = current_high; 10247 } 10248 else 10249 { 10250 struct die_info *child = die->child; 10251 10252 while (child && child->tag) 10253 { 10254 switch (child->tag) { 10255 case DW_TAG_subprogram: 10256 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu); 10257 break; 10258 case DW_TAG_namespace: 10259 case DW_TAG_module: 10260 /* FIXME: carlton/2004-01-16: Should we do this for 10261 DW_TAG_class_type/DW_TAG_structure_type, too? I think 10262 that current GCC's always emit the DIEs corresponding 10263 to definitions of methods of classes as children of a 10264 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to 10265 the DIEs giving the declarations, which could be 10266 anywhere). But I don't see any reason why the 10267 standards says that they have to be there. */ 10268 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu); 10269 10270 if (current_low != ((CORE_ADDR) -1)) 10271 { 10272 best_low = min (best_low, current_low); 10273 best_high = max (best_high, current_high); 10274 } 10275 break; 10276 default: 10277 /* Ignore. */ 10278 break; 10279 } 10280 10281 child = sibling_die (child); 10282 } 10283 } 10284 10285 *lowpc = best_low; 10286 *highpc = best_high; 10287 } 10288 10289 /* Record the address ranges for BLOCK, offset by BASEADDR, as given 10290 in DIE. */ 10291 10292 static void 10293 dwarf2_record_block_ranges (struct die_info *die, struct block *block, 10294 CORE_ADDR baseaddr, struct dwarf2_cu *cu) 10295 { 10296 struct objfile *objfile = cu->objfile; 10297 struct attribute *attr; 10298 struct attribute *attr_high; 10299 10300 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu); 10301 if (attr_high) 10302 { 10303 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 10304 if (attr) 10305 { 10306 CORE_ADDR low = DW_ADDR (attr); 10307 CORE_ADDR high; 10308 if (attr_high->form == DW_FORM_addr 10309 || attr_high->form == DW_FORM_GNU_addr_index) 10310 high = DW_ADDR (attr_high); 10311 else 10312 high = low + DW_UNSND (attr_high); 10313 10314 record_block_range (block, baseaddr + low, baseaddr + high - 1); 10315 } 10316 } 10317 10318 attr = dwarf2_attr (die, DW_AT_ranges, cu); 10319 if (attr) 10320 { 10321 bfd *obfd = objfile->obfd; 10322 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton. 10323 We take advantage of the fact that DW_AT_ranges does not appear 10324 in DW_TAG_compile_unit of DWO files. */ 10325 int need_ranges_base = die->tag != DW_TAG_compile_unit; 10326 10327 /* The value of the DW_AT_ranges attribute is the offset of the 10328 address range list in the .debug_ranges section. */ 10329 unsigned long offset = (DW_UNSND (attr) 10330 + (need_ranges_base ? cu->ranges_base : 0)); 10331 gdb_byte *buffer = dwarf2_per_objfile->ranges.buffer + offset; 10332 10333 /* For some target architectures, but not others, the 10334 read_address function sign-extends the addresses it returns. 10335 To recognize base address selection entries, we need a 10336 mask. */ 10337 unsigned int addr_size = cu->header.addr_size; 10338 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); 10339 10340 /* The base address, to which the next pair is relative. Note 10341 that this 'base' is a DWARF concept: most entries in a range 10342 list are relative, to reduce the number of relocs against the 10343 debugging information. This is separate from this function's 10344 'baseaddr' argument, which GDB uses to relocate debugging 10345 information from a shared library based on the address at 10346 which the library was loaded. */ 10347 CORE_ADDR base = cu->base_address; 10348 int base_known = cu->base_known; 10349 10350 gdb_assert (dwarf2_per_objfile->ranges.readin); 10351 if (offset >= dwarf2_per_objfile->ranges.size) 10352 { 10353 complaint (&symfile_complaints, 10354 _("Offset %lu out of bounds for DW_AT_ranges attribute"), 10355 offset); 10356 return; 10357 } 10358 10359 for (;;) 10360 { 10361 unsigned int bytes_read; 10362 CORE_ADDR start, end; 10363 10364 start = read_address (obfd, buffer, cu, &bytes_read); 10365 buffer += bytes_read; 10366 end = read_address (obfd, buffer, cu, &bytes_read); 10367 buffer += bytes_read; 10368 10369 /* Did we find the end of the range list? */ 10370 if (start == 0 && end == 0) 10371 break; 10372 10373 /* Did we find a base address selection entry? */ 10374 else if ((start & base_select_mask) == base_select_mask) 10375 { 10376 base = end; 10377 base_known = 1; 10378 } 10379 10380 /* We found an ordinary address range. */ 10381 else 10382 { 10383 if (!base_known) 10384 { 10385 complaint (&symfile_complaints, 10386 _("Invalid .debug_ranges data " 10387 "(no base address)")); 10388 return; 10389 } 10390 10391 if (start > end) 10392 { 10393 /* Inverted range entries are invalid. */ 10394 complaint (&symfile_complaints, 10395 _("Invalid .debug_ranges data " 10396 "(inverted range)")); 10397 return; 10398 } 10399 10400 /* Empty range entries have no effect. */ 10401 if (start == end) 10402 continue; 10403 10404 start += base + baseaddr; 10405 end += base + baseaddr; 10406 10407 /* A not-uncommon case of bad debug info. 10408 Don't pollute the addrmap with bad data. */ 10409 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero) 10410 { 10411 complaint (&symfile_complaints, 10412 _(".debug_ranges entry has start address of zero" 10413 " [in module %s]"), objfile->name); 10414 continue; 10415 } 10416 10417 record_block_range (block, start, end - 1); 10418 } 10419 } 10420 } 10421 } 10422 10423 /* Check whether the producer field indicates either of GCC < 4.6, or the 10424 Intel C/C++ compiler, and cache the result in CU. */ 10425 10426 static void 10427 check_producer (struct dwarf2_cu *cu) 10428 { 10429 const char *cs; 10430 int major, minor, release; 10431 10432 if (cu->producer == NULL) 10433 { 10434 /* For unknown compilers expect their behavior is DWARF version 10435 compliant. 10436 10437 GCC started to support .debug_types sections by -gdwarf-4 since 10438 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer 10439 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4 10440 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility 10441 interpreted incorrectly by GDB now - GCC PR debug/48229. */ 10442 } 10443 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0) 10444 { 10445 /* Skip any identifier after "GNU " - such as "C++" or "Java". */ 10446 10447 cs = &cu->producer[strlen ("GNU ")]; 10448 while (*cs && !isdigit (*cs)) 10449 cs++; 10450 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3) 10451 { 10452 /* Not recognized as GCC. */ 10453 } 10454 else 10455 { 10456 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6); 10457 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3); 10458 } 10459 } 10460 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0) 10461 cu->producer_is_icc = 1; 10462 else 10463 { 10464 /* For other non-GCC compilers, expect their behavior is DWARF version 10465 compliant. */ 10466 } 10467 10468 cu->checked_producer = 1; 10469 } 10470 10471 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up 10472 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed 10473 during 4.6.0 experimental. */ 10474 10475 static int 10476 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu) 10477 { 10478 if (!cu->checked_producer) 10479 check_producer (cu); 10480 10481 return cu->producer_is_gxx_lt_4_6; 10482 } 10483 10484 /* Return the default accessibility type if it is not overriden by 10485 DW_AT_accessibility. */ 10486 10487 static enum dwarf_access_attribute 10488 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu) 10489 { 10490 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu)) 10491 { 10492 /* The default DWARF 2 accessibility for members is public, the default 10493 accessibility for inheritance is private. */ 10494 10495 if (die->tag != DW_TAG_inheritance) 10496 return DW_ACCESS_public; 10497 else 10498 return DW_ACCESS_private; 10499 } 10500 else 10501 { 10502 /* DWARF 3+ defines the default accessibility a different way. The same 10503 rules apply now for DW_TAG_inheritance as for the members and it only 10504 depends on the container kind. */ 10505 10506 if (die->parent->tag == DW_TAG_class_type) 10507 return DW_ACCESS_private; 10508 else 10509 return DW_ACCESS_public; 10510 } 10511 } 10512 10513 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte 10514 offset. If the attribute was not found return 0, otherwise return 10515 1. If it was found but could not properly be handled, set *OFFSET 10516 to 0. */ 10517 10518 static int 10519 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu, 10520 LONGEST *offset) 10521 { 10522 struct attribute *attr; 10523 10524 attr = dwarf2_attr (die, DW_AT_data_member_location, cu); 10525 if (attr != NULL) 10526 { 10527 *offset = 0; 10528 10529 /* Note that we do not check for a section offset first here. 10530 This is because DW_AT_data_member_location is new in DWARF 4, 10531 so if we see it, we can assume that a constant form is really 10532 a constant and not a section offset. */ 10533 if (attr_form_is_constant (attr)) 10534 *offset = dwarf2_get_attr_constant_value (attr, 0); 10535 else if (attr_form_is_section_offset (attr)) 10536 dwarf2_complex_location_expr_complaint (); 10537 else if (attr_form_is_block (attr)) 10538 *offset = decode_locdesc (DW_BLOCK (attr), cu); 10539 else 10540 dwarf2_complex_location_expr_complaint (); 10541 10542 return 1; 10543 } 10544 10545 return 0; 10546 } 10547 10548 /* Add an aggregate field to the field list. */ 10549 10550 static void 10551 dwarf2_add_field (struct field_info *fip, struct die_info *die, 10552 struct dwarf2_cu *cu) 10553 { 10554 struct objfile *objfile = cu->objfile; 10555 struct gdbarch *gdbarch = get_objfile_arch (objfile); 10556 struct nextfield *new_field; 10557 struct attribute *attr; 10558 struct field *fp; 10559 const char *fieldname = ""; 10560 10561 /* Allocate a new field list entry and link it in. */ 10562 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield)); 10563 make_cleanup (xfree, new_field); 10564 memset (new_field, 0, sizeof (struct nextfield)); 10565 10566 if (die->tag == DW_TAG_inheritance) 10567 { 10568 new_field->next = fip->baseclasses; 10569 fip->baseclasses = new_field; 10570 } 10571 else 10572 { 10573 new_field->next = fip->fields; 10574 fip->fields = new_field; 10575 } 10576 fip->nfields++; 10577 10578 attr = dwarf2_attr (die, DW_AT_accessibility, cu); 10579 if (attr) 10580 new_field->accessibility = DW_UNSND (attr); 10581 else 10582 new_field->accessibility = dwarf2_default_access_attribute (die, cu); 10583 if (new_field->accessibility != DW_ACCESS_public) 10584 fip->non_public_fields = 1; 10585 10586 attr = dwarf2_attr (die, DW_AT_virtuality, cu); 10587 if (attr) 10588 new_field->virtuality = DW_UNSND (attr); 10589 else 10590 new_field->virtuality = DW_VIRTUALITY_none; 10591 10592 fp = &new_field->field; 10593 10594 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu)) 10595 { 10596 LONGEST offset; 10597 10598 /* Data member other than a C++ static data member. */ 10599 10600 /* Get type of field. */ 10601 fp->type = die_type (die, cu); 10602 10603 SET_FIELD_BITPOS (*fp, 0); 10604 10605 /* Get bit size of field (zero if none). */ 10606 attr = dwarf2_attr (die, DW_AT_bit_size, cu); 10607 if (attr) 10608 { 10609 FIELD_BITSIZE (*fp) = DW_UNSND (attr); 10610 } 10611 else 10612 { 10613 FIELD_BITSIZE (*fp) = 0; 10614 } 10615 10616 /* Get bit offset of field. */ 10617 if (handle_data_member_location (die, cu, &offset)) 10618 SET_FIELD_BITPOS (*fp, offset * bits_per_byte); 10619 attr = dwarf2_attr (die, DW_AT_bit_offset, cu); 10620 if (attr) 10621 { 10622 if (gdbarch_bits_big_endian (gdbarch)) 10623 { 10624 /* For big endian bits, the DW_AT_bit_offset gives the 10625 additional bit offset from the MSB of the containing 10626 anonymous object to the MSB of the field. We don't 10627 have to do anything special since we don't need to 10628 know the size of the anonymous object. */ 10629 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr)); 10630 } 10631 else 10632 { 10633 /* For little endian bits, compute the bit offset to the 10634 MSB of the anonymous object, subtract off the number of 10635 bits from the MSB of the field to the MSB of the 10636 object, and then subtract off the number of bits of 10637 the field itself. The result is the bit offset of 10638 the LSB of the field. */ 10639 int anonymous_size; 10640 int bit_offset = DW_UNSND (attr); 10641 10642 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 10643 if (attr) 10644 { 10645 /* The size of the anonymous object containing 10646 the bit field is explicit, so use the 10647 indicated size (in bytes). */ 10648 anonymous_size = DW_UNSND (attr); 10649 } 10650 else 10651 { 10652 /* The size of the anonymous object containing 10653 the bit field must be inferred from the type 10654 attribute of the data member containing the 10655 bit field. */ 10656 anonymous_size = TYPE_LENGTH (fp->type); 10657 } 10658 SET_FIELD_BITPOS (*fp, 10659 (FIELD_BITPOS (*fp) 10660 + anonymous_size * bits_per_byte 10661 - bit_offset - FIELD_BITSIZE (*fp))); 10662 } 10663 } 10664 10665 /* Get name of field. */ 10666 fieldname = dwarf2_name (die, cu); 10667 if (fieldname == NULL) 10668 fieldname = ""; 10669 10670 /* The name is already allocated along with this objfile, so we don't 10671 need to duplicate it for the type. */ 10672 fp->name = fieldname; 10673 10674 /* Change accessibility for artificial fields (e.g. virtual table 10675 pointer or virtual base class pointer) to private. */ 10676 if (dwarf2_attr (die, DW_AT_artificial, cu)) 10677 { 10678 FIELD_ARTIFICIAL (*fp) = 1; 10679 new_field->accessibility = DW_ACCESS_private; 10680 fip->non_public_fields = 1; 10681 } 10682 } 10683 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable) 10684 { 10685 /* C++ static member. */ 10686 10687 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that 10688 is a declaration, but all versions of G++ as of this writing 10689 (so through at least 3.2.1) incorrectly generate 10690 DW_TAG_variable tags. */ 10691 10692 const char *physname; 10693 10694 /* Get name of field. */ 10695 fieldname = dwarf2_name (die, cu); 10696 if (fieldname == NULL) 10697 return; 10698 10699 attr = dwarf2_attr (die, DW_AT_const_value, cu); 10700 if (attr 10701 /* Only create a symbol if this is an external value. 10702 new_symbol checks this and puts the value in the global symbol 10703 table, which we want. If it is not external, new_symbol 10704 will try to put the value in cu->list_in_scope which is wrong. */ 10705 && dwarf2_flag_true_p (die, DW_AT_external, cu)) 10706 { 10707 /* A static const member, not much different than an enum as far as 10708 we're concerned, except that we can support more types. */ 10709 new_symbol (die, NULL, cu); 10710 } 10711 10712 /* Get physical name. */ 10713 physname = dwarf2_physname (fieldname, die, cu); 10714 10715 /* The name is already allocated along with this objfile, so we don't 10716 need to duplicate it for the type. */ 10717 SET_FIELD_PHYSNAME (*fp, physname ? physname : ""); 10718 FIELD_TYPE (*fp) = die_type (die, cu); 10719 FIELD_NAME (*fp) = fieldname; 10720 } 10721 else if (die->tag == DW_TAG_inheritance) 10722 { 10723 LONGEST offset; 10724 10725 /* C++ base class field. */ 10726 if (handle_data_member_location (die, cu, &offset)) 10727 SET_FIELD_BITPOS (*fp, offset * bits_per_byte); 10728 FIELD_BITSIZE (*fp) = 0; 10729 FIELD_TYPE (*fp) = die_type (die, cu); 10730 FIELD_NAME (*fp) = type_name_no_tag (fp->type); 10731 fip->nbaseclasses++; 10732 } 10733 } 10734 10735 /* Add a typedef defined in the scope of the FIP's class. */ 10736 10737 static void 10738 dwarf2_add_typedef (struct field_info *fip, struct die_info *die, 10739 struct dwarf2_cu *cu) 10740 { 10741 struct objfile *objfile = cu->objfile; 10742 struct typedef_field_list *new_field; 10743 struct attribute *attr; 10744 struct typedef_field *fp; 10745 char *fieldname = ""; 10746 10747 /* Allocate a new field list entry and link it in. */ 10748 new_field = xzalloc (sizeof (*new_field)); 10749 make_cleanup (xfree, new_field); 10750 10751 gdb_assert (die->tag == DW_TAG_typedef); 10752 10753 fp = &new_field->field; 10754 10755 /* Get name of field. */ 10756 fp->name = dwarf2_name (die, cu); 10757 if (fp->name == NULL) 10758 return; 10759 10760 fp->type = read_type_die (die, cu); 10761 10762 new_field->next = fip->typedef_field_list; 10763 fip->typedef_field_list = new_field; 10764 fip->typedef_field_list_count++; 10765 } 10766 10767 /* Create the vector of fields, and attach it to the type. */ 10768 10769 static void 10770 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type, 10771 struct dwarf2_cu *cu) 10772 { 10773 int nfields = fip->nfields; 10774 10775 /* Record the field count, allocate space for the array of fields, 10776 and create blank accessibility bitfields if necessary. */ 10777 TYPE_NFIELDS (type) = nfields; 10778 TYPE_FIELDS (type) = (struct field *) 10779 TYPE_ALLOC (type, sizeof (struct field) * nfields); 10780 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields); 10781 10782 if (fip->non_public_fields && cu->language != language_ada) 10783 { 10784 ALLOCATE_CPLUS_STRUCT_TYPE (type); 10785 10786 TYPE_FIELD_PRIVATE_BITS (type) = 10787 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); 10788 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields); 10789 10790 TYPE_FIELD_PROTECTED_BITS (type) = 10791 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); 10792 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields); 10793 10794 TYPE_FIELD_IGNORE_BITS (type) = 10795 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); 10796 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields); 10797 } 10798 10799 /* If the type has baseclasses, allocate and clear a bit vector for 10800 TYPE_FIELD_VIRTUAL_BITS. */ 10801 if (fip->nbaseclasses && cu->language != language_ada) 10802 { 10803 int num_bytes = B_BYTES (fip->nbaseclasses); 10804 unsigned char *pointer; 10805 10806 ALLOCATE_CPLUS_STRUCT_TYPE (type); 10807 pointer = TYPE_ALLOC (type, num_bytes); 10808 TYPE_FIELD_VIRTUAL_BITS (type) = pointer; 10809 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses); 10810 TYPE_N_BASECLASSES (type) = fip->nbaseclasses; 10811 } 10812 10813 /* Copy the saved-up fields into the field vector. Start from the head of 10814 the list, adding to the tail of the field array, so that they end up in 10815 the same order in the array in which they were added to the list. */ 10816 while (nfields-- > 0) 10817 { 10818 struct nextfield *fieldp; 10819 10820 if (fip->fields) 10821 { 10822 fieldp = fip->fields; 10823 fip->fields = fieldp->next; 10824 } 10825 else 10826 { 10827 fieldp = fip->baseclasses; 10828 fip->baseclasses = fieldp->next; 10829 } 10830 10831 TYPE_FIELD (type, nfields) = fieldp->field; 10832 switch (fieldp->accessibility) 10833 { 10834 case DW_ACCESS_private: 10835 if (cu->language != language_ada) 10836 SET_TYPE_FIELD_PRIVATE (type, nfields); 10837 break; 10838 10839 case DW_ACCESS_protected: 10840 if (cu->language != language_ada) 10841 SET_TYPE_FIELD_PROTECTED (type, nfields); 10842 break; 10843 10844 case DW_ACCESS_public: 10845 break; 10846 10847 default: 10848 /* Unknown accessibility. Complain and treat it as public. */ 10849 { 10850 complaint (&symfile_complaints, _("unsupported accessibility %d"), 10851 fieldp->accessibility); 10852 } 10853 break; 10854 } 10855 if (nfields < fip->nbaseclasses) 10856 { 10857 switch (fieldp->virtuality) 10858 { 10859 case DW_VIRTUALITY_virtual: 10860 case DW_VIRTUALITY_pure_virtual: 10861 if (cu->language == language_ada) 10862 error (_("unexpected virtuality in component of Ada type")); 10863 SET_TYPE_FIELD_VIRTUAL (type, nfields); 10864 break; 10865 } 10866 } 10867 } 10868 } 10869 10870 /* Return true if this member function is a constructor, false 10871 otherwise. */ 10872 10873 static int 10874 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu) 10875 { 10876 const char *fieldname; 10877 const char *typename; 10878 int len; 10879 10880 if (die->parent == NULL) 10881 return 0; 10882 10883 if (die->parent->tag != DW_TAG_structure_type 10884 && die->parent->tag != DW_TAG_union_type 10885 && die->parent->tag != DW_TAG_class_type) 10886 return 0; 10887 10888 fieldname = dwarf2_name (die, cu); 10889 typename = dwarf2_name (die->parent, cu); 10890 if (fieldname == NULL || typename == NULL) 10891 return 0; 10892 10893 len = strlen (fieldname); 10894 return (strncmp (fieldname, typename, len) == 0 10895 && (typename[len] == '\0' || typename[len] == '<')); 10896 } 10897 10898 /* Add a member function to the proper fieldlist. */ 10899 10900 static void 10901 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die, 10902 struct type *type, struct dwarf2_cu *cu) 10903 { 10904 struct objfile *objfile = cu->objfile; 10905 struct attribute *attr; 10906 struct fnfieldlist *flp; 10907 int i; 10908 struct fn_field *fnp; 10909 const char *fieldname; 10910 struct nextfnfield *new_fnfield; 10911 struct type *this_type; 10912 enum dwarf_access_attribute accessibility; 10913 10914 if (cu->language == language_ada) 10915 error (_("unexpected member function in Ada type")); 10916 10917 /* Get name of member function. */ 10918 fieldname = dwarf2_name (die, cu); 10919 if (fieldname == NULL) 10920 return; 10921 10922 /* Look up member function name in fieldlist. */ 10923 for (i = 0; i < fip->nfnfields; i++) 10924 { 10925 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0) 10926 break; 10927 } 10928 10929 /* Create new list element if necessary. */ 10930 if (i < fip->nfnfields) 10931 flp = &fip->fnfieldlists[i]; 10932 else 10933 { 10934 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0) 10935 { 10936 fip->fnfieldlists = (struct fnfieldlist *) 10937 xrealloc (fip->fnfieldlists, 10938 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK) 10939 * sizeof (struct fnfieldlist)); 10940 if (fip->nfnfields == 0) 10941 make_cleanup (free_current_contents, &fip->fnfieldlists); 10942 } 10943 flp = &fip->fnfieldlists[fip->nfnfields]; 10944 flp->name = fieldname; 10945 flp->length = 0; 10946 flp->head = NULL; 10947 i = fip->nfnfields++; 10948 } 10949 10950 /* Create a new member function field and chain it to the field list 10951 entry. */ 10952 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield)); 10953 make_cleanup (xfree, new_fnfield); 10954 memset (new_fnfield, 0, sizeof (struct nextfnfield)); 10955 new_fnfield->next = flp->head; 10956 flp->head = new_fnfield; 10957 flp->length++; 10958 10959 /* Fill in the member function field info. */ 10960 fnp = &new_fnfield->fnfield; 10961 10962 /* Delay processing of the physname until later. */ 10963 if (cu->language == language_cplus || cu->language == language_java) 10964 { 10965 add_to_method_list (type, i, flp->length - 1, fieldname, 10966 die, cu); 10967 } 10968 else 10969 { 10970 const char *physname = dwarf2_physname (fieldname, die, cu); 10971 fnp->physname = physname ? physname : ""; 10972 } 10973 10974 fnp->type = alloc_type (objfile); 10975 this_type = read_type_die (die, cu); 10976 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC) 10977 { 10978 int nparams = TYPE_NFIELDS (this_type); 10979 10980 /* TYPE is the domain of this method, and THIS_TYPE is the type 10981 of the method itself (TYPE_CODE_METHOD). */ 10982 smash_to_method_type (fnp->type, type, 10983 TYPE_TARGET_TYPE (this_type), 10984 TYPE_FIELDS (this_type), 10985 TYPE_NFIELDS (this_type), 10986 TYPE_VARARGS (this_type)); 10987 10988 /* Handle static member functions. 10989 Dwarf2 has no clean way to discern C++ static and non-static 10990 member functions. G++ helps GDB by marking the first 10991 parameter for non-static member functions (which is the this 10992 pointer) as artificial. We obtain this information from 10993 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */ 10994 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0) 10995 fnp->voffset = VOFFSET_STATIC; 10996 } 10997 else 10998 complaint (&symfile_complaints, _("member function type missing for '%s'"), 10999 dwarf2_full_name (fieldname, die, cu)); 11000 11001 /* Get fcontext from DW_AT_containing_type if present. */ 11002 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) 11003 fnp->fcontext = die_containing_type (die, cu); 11004 11005 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and 11006 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */ 11007 11008 /* Get accessibility. */ 11009 attr = dwarf2_attr (die, DW_AT_accessibility, cu); 11010 if (attr) 11011 accessibility = DW_UNSND (attr); 11012 else 11013 accessibility = dwarf2_default_access_attribute (die, cu); 11014 switch (accessibility) 11015 { 11016 case DW_ACCESS_private: 11017 fnp->is_private = 1; 11018 break; 11019 case DW_ACCESS_protected: 11020 fnp->is_protected = 1; 11021 break; 11022 } 11023 11024 /* Check for artificial methods. */ 11025 attr = dwarf2_attr (die, DW_AT_artificial, cu); 11026 if (attr && DW_UNSND (attr) != 0) 11027 fnp->is_artificial = 1; 11028 11029 fnp->is_constructor = dwarf2_is_constructor (die, cu); 11030 11031 /* Get index in virtual function table if it is a virtual member 11032 function. For older versions of GCC, this is an offset in the 11033 appropriate virtual table, as specified by DW_AT_containing_type. 11034 For everyone else, it is an expression to be evaluated relative 11035 to the object address. */ 11036 11037 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu); 11038 if (attr) 11039 { 11040 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0) 11041 { 11042 if (DW_BLOCK (attr)->data[0] == DW_OP_constu) 11043 { 11044 /* Old-style GCC. */ 11045 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2; 11046 } 11047 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref 11048 || (DW_BLOCK (attr)->size > 1 11049 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size 11050 && DW_BLOCK (attr)->data[1] == cu->header.addr_size)) 11051 { 11052 struct dwarf_block blk; 11053 int offset; 11054 11055 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref 11056 ? 1 : 2); 11057 blk.size = DW_BLOCK (attr)->size - offset; 11058 blk.data = DW_BLOCK (attr)->data + offset; 11059 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu); 11060 if ((fnp->voffset % cu->header.addr_size) != 0) 11061 dwarf2_complex_location_expr_complaint (); 11062 else 11063 fnp->voffset /= cu->header.addr_size; 11064 fnp->voffset += 2; 11065 } 11066 else 11067 dwarf2_complex_location_expr_complaint (); 11068 11069 if (!fnp->fcontext) 11070 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0)); 11071 } 11072 else if (attr_form_is_section_offset (attr)) 11073 { 11074 dwarf2_complex_location_expr_complaint (); 11075 } 11076 else 11077 { 11078 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location", 11079 fieldname); 11080 } 11081 } 11082 else 11083 { 11084 attr = dwarf2_attr (die, DW_AT_virtuality, cu); 11085 if (attr && DW_UNSND (attr)) 11086 { 11087 /* GCC does this, as of 2008-08-25; PR debug/37237. */ 11088 complaint (&symfile_complaints, 11089 _("Member function \"%s\" (offset %d) is virtual " 11090 "but the vtable offset is not specified"), 11091 fieldname, die->offset.sect_off); 11092 ALLOCATE_CPLUS_STRUCT_TYPE (type); 11093 TYPE_CPLUS_DYNAMIC (type) = 1; 11094 } 11095 } 11096 } 11097 11098 /* Create the vector of member function fields, and attach it to the type. */ 11099 11100 static void 11101 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type, 11102 struct dwarf2_cu *cu) 11103 { 11104 struct fnfieldlist *flp; 11105 int i; 11106 11107 if (cu->language == language_ada) 11108 error (_("unexpected member functions in Ada type")); 11109 11110 ALLOCATE_CPLUS_STRUCT_TYPE (type); 11111 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *) 11112 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields); 11113 11114 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++) 11115 { 11116 struct nextfnfield *nfp = flp->head; 11117 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i); 11118 int k; 11119 11120 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name; 11121 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length; 11122 fn_flp->fn_fields = (struct fn_field *) 11123 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length); 11124 for (k = flp->length; (k--, nfp); nfp = nfp->next) 11125 fn_flp->fn_fields[k] = nfp->fnfield; 11126 } 11127 11128 TYPE_NFN_FIELDS (type) = fip->nfnfields; 11129 } 11130 11131 /* Returns non-zero if NAME is the name of a vtable member in CU's 11132 language, zero otherwise. */ 11133 static int 11134 is_vtable_name (const char *name, struct dwarf2_cu *cu) 11135 { 11136 static const char vptr[] = "_vptr"; 11137 static const char vtable[] = "vtable"; 11138 11139 /* Look for the C++ and Java forms of the vtable. */ 11140 if ((cu->language == language_java 11141 && strncmp (name, vtable, sizeof (vtable) - 1) == 0) 11142 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0 11143 && is_cplus_marker (name[sizeof (vptr) - 1]))) 11144 return 1; 11145 11146 return 0; 11147 } 11148 11149 /* GCC outputs unnamed structures that are really pointers to member 11150 functions, with the ABI-specified layout. If TYPE describes 11151 such a structure, smash it into a member function type. 11152 11153 GCC shouldn't do this; it should just output pointer to member DIEs. 11154 This is GCC PR debug/28767. */ 11155 11156 static void 11157 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile) 11158 { 11159 struct type *pfn_type, *domain_type, *new_type; 11160 11161 /* Check for a structure with no name and two children. */ 11162 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2) 11163 return; 11164 11165 /* Check for __pfn and __delta members. */ 11166 if (TYPE_FIELD_NAME (type, 0) == NULL 11167 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0 11168 || TYPE_FIELD_NAME (type, 1) == NULL 11169 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0) 11170 return; 11171 11172 /* Find the type of the method. */ 11173 pfn_type = TYPE_FIELD_TYPE (type, 0); 11174 if (pfn_type == NULL 11175 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR 11176 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC) 11177 return; 11178 11179 /* Look for the "this" argument. */ 11180 pfn_type = TYPE_TARGET_TYPE (pfn_type); 11181 if (TYPE_NFIELDS (pfn_type) == 0 11182 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */ 11183 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR) 11184 return; 11185 11186 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0)); 11187 new_type = alloc_type (objfile); 11188 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type), 11189 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type), 11190 TYPE_VARARGS (pfn_type)); 11191 smash_to_methodptr_type (type, new_type); 11192 } 11193 11194 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler 11195 (icc). */ 11196 11197 static int 11198 producer_is_icc (struct dwarf2_cu *cu) 11199 { 11200 if (!cu->checked_producer) 11201 check_producer (cu); 11202 11203 return cu->producer_is_icc; 11204 } 11205 11206 /* Called when we find the DIE that starts a structure or union scope 11207 (definition) to create a type for the structure or union. Fill in 11208 the type's name and general properties; the members will not be 11209 processed until process_structure_type. 11210 11211 NOTE: we need to call these functions regardless of whether or not the 11212 DIE has a DW_AT_name attribute, since it might be an anonymous 11213 structure or union. This gets the type entered into our set of 11214 user defined types. 11215 11216 However, if the structure is incomplete (an opaque struct/union) 11217 then suppress creating a symbol table entry for it since gdb only 11218 wants to find the one with the complete definition. Note that if 11219 it is complete, we just call new_symbol, which does it's own 11220 checking about whether the struct/union is anonymous or not (and 11221 suppresses creating a symbol table entry itself). */ 11222 11223 static struct type * 11224 read_structure_type (struct die_info *die, struct dwarf2_cu *cu) 11225 { 11226 struct objfile *objfile = cu->objfile; 11227 struct type *type; 11228 struct attribute *attr; 11229 const char *name; 11230 11231 /* If the definition of this type lives in .debug_types, read that type. 11232 Don't follow DW_AT_specification though, that will take us back up 11233 the chain and we want to go down. */ 11234 attr = dwarf2_attr_no_follow (die, DW_AT_signature); 11235 if (attr) 11236 { 11237 struct dwarf2_cu *type_cu = cu; 11238 struct die_info *type_die = follow_die_ref_or_sig (die, attr, &type_cu); 11239 11240 /* We could just recurse on read_structure_type, but we need to call 11241 get_die_type to ensure only one type for this DIE is created. 11242 This is important, for example, because for c++ classes we need 11243 TYPE_NAME set which is only done by new_symbol. Blech. */ 11244 type = read_type_die (type_die, type_cu); 11245 11246 /* TYPE_CU may not be the same as CU. 11247 Ensure TYPE is recorded in CU's type_hash table. */ 11248 return set_die_type (die, type, cu); 11249 } 11250 11251 type = alloc_type (objfile); 11252 INIT_CPLUS_SPECIFIC (type); 11253 11254 name = dwarf2_name (die, cu); 11255 if (name != NULL) 11256 { 11257 if (cu->language == language_cplus 11258 || cu->language == language_java) 11259 { 11260 const char *full_name = dwarf2_full_name (name, die, cu); 11261 11262 /* dwarf2_full_name might have already finished building the DIE's 11263 type. If so, there is no need to continue. */ 11264 if (get_die_type (die, cu) != NULL) 11265 return get_die_type (die, cu); 11266 11267 TYPE_TAG_NAME (type) = full_name; 11268 if (die->tag == DW_TAG_structure_type 11269 || die->tag == DW_TAG_class_type) 11270 TYPE_NAME (type) = TYPE_TAG_NAME (type); 11271 } 11272 else 11273 { 11274 /* The name is already allocated along with this objfile, so 11275 we don't need to duplicate it for the type. */ 11276 TYPE_TAG_NAME (type) = name; 11277 if (die->tag == DW_TAG_class_type) 11278 TYPE_NAME (type) = TYPE_TAG_NAME (type); 11279 } 11280 } 11281 11282 if (die->tag == DW_TAG_structure_type) 11283 { 11284 TYPE_CODE (type) = TYPE_CODE_STRUCT; 11285 } 11286 else if (die->tag == DW_TAG_union_type) 11287 { 11288 TYPE_CODE (type) = TYPE_CODE_UNION; 11289 } 11290 else 11291 { 11292 TYPE_CODE (type) = TYPE_CODE_CLASS; 11293 } 11294 11295 if (cu->language == language_cplus && die->tag == DW_TAG_class_type) 11296 TYPE_DECLARED_CLASS (type) = 1; 11297 11298 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 11299 if (attr) 11300 { 11301 TYPE_LENGTH (type) = DW_UNSND (attr); 11302 } 11303 else 11304 { 11305 TYPE_LENGTH (type) = 0; 11306 } 11307 11308 if (producer_is_icc (cu)) 11309 { 11310 /* ICC does not output the required DW_AT_declaration 11311 on incomplete types, but gives them a size of zero. */ 11312 } 11313 else 11314 TYPE_STUB_SUPPORTED (type) = 1; 11315 11316 if (die_is_declaration (die, cu)) 11317 TYPE_STUB (type) = 1; 11318 else if (attr == NULL && die->child == NULL 11319 && producer_is_realview (cu->producer)) 11320 /* RealView does not output the required DW_AT_declaration 11321 on incomplete types. */ 11322 TYPE_STUB (type) = 1; 11323 11324 /* We need to add the type field to the die immediately so we don't 11325 infinitely recurse when dealing with pointers to the structure 11326 type within the structure itself. */ 11327 set_die_type (die, type, cu); 11328 11329 /* set_die_type should be already done. */ 11330 set_descriptive_type (type, die, cu); 11331 11332 return type; 11333 } 11334 11335 /* Finish creating a structure or union type, including filling in 11336 its members and creating a symbol for it. */ 11337 11338 static void 11339 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu) 11340 { 11341 struct objfile *objfile = cu->objfile; 11342 struct die_info *child_die = die->child; 11343 struct type *type; 11344 11345 type = get_die_type (die, cu); 11346 if (type == NULL) 11347 type = read_structure_type (die, cu); 11348 11349 if (die->child != NULL && ! die_is_declaration (die, cu)) 11350 { 11351 struct field_info fi; 11352 struct die_info *child_die; 11353 VEC (symbolp) *template_args = NULL; 11354 struct cleanup *back_to = make_cleanup (null_cleanup, 0); 11355 11356 memset (&fi, 0, sizeof (struct field_info)); 11357 11358 child_die = die->child; 11359 11360 while (child_die && child_die->tag) 11361 { 11362 if (child_die->tag == DW_TAG_member 11363 || child_die->tag == DW_TAG_variable) 11364 { 11365 /* NOTE: carlton/2002-11-05: A C++ static data member 11366 should be a DW_TAG_member that is a declaration, but 11367 all versions of G++ as of this writing (so through at 11368 least 3.2.1) incorrectly generate DW_TAG_variable 11369 tags for them instead. */ 11370 dwarf2_add_field (&fi, child_die, cu); 11371 } 11372 else if (child_die->tag == DW_TAG_subprogram) 11373 { 11374 /* C++ member function. */ 11375 dwarf2_add_member_fn (&fi, child_die, type, cu); 11376 } 11377 else if (child_die->tag == DW_TAG_inheritance) 11378 { 11379 /* C++ base class field. */ 11380 dwarf2_add_field (&fi, child_die, cu); 11381 } 11382 else if (child_die->tag == DW_TAG_typedef) 11383 dwarf2_add_typedef (&fi, child_die, cu); 11384 else if (child_die->tag == DW_TAG_template_type_param 11385 || child_die->tag == DW_TAG_template_value_param) 11386 { 11387 struct symbol *arg = new_symbol (child_die, NULL, cu); 11388 11389 if (arg != NULL) 11390 VEC_safe_push (symbolp, template_args, arg); 11391 } 11392 11393 child_die = sibling_die (child_die); 11394 } 11395 11396 /* Attach template arguments to type. */ 11397 if (! VEC_empty (symbolp, template_args)) 11398 { 11399 ALLOCATE_CPLUS_STRUCT_TYPE (type); 11400 TYPE_N_TEMPLATE_ARGUMENTS (type) 11401 = VEC_length (symbolp, template_args); 11402 TYPE_TEMPLATE_ARGUMENTS (type) 11403 = obstack_alloc (&objfile->objfile_obstack, 11404 (TYPE_N_TEMPLATE_ARGUMENTS (type) 11405 * sizeof (struct symbol *))); 11406 memcpy (TYPE_TEMPLATE_ARGUMENTS (type), 11407 VEC_address (symbolp, template_args), 11408 (TYPE_N_TEMPLATE_ARGUMENTS (type) 11409 * sizeof (struct symbol *))); 11410 VEC_free (symbolp, template_args); 11411 } 11412 11413 /* Attach fields and member functions to the type. */ 11414 if (fi.nfields) 11415 dwarf2_attach_fields_to_type (&fi, type, cu); 11416 if (fi.nfnfields) 11417 { 11418 dwarf2_attach_fn_fields_to_type (&fi, type, cu); 11419 11420 /* Get the type which refers to the base class (possibly this 11421 class itself) which contains the vtable pointer for the current 11422 class from the DW_AT_containing_type attribute. This use of 11423 DW_AT_containing_type is a GNU extension. */ 11424 11425 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) 11426 { 11427 struct type *t = die_containing_type (die, cu); 11428 11429 TYPE_VPTR_BASETYPE (type) = t; 11430 if (type == t) 11431 { 11432 int i; 11433 11434 /* Our own class provides vtbl ptr. */ 11435 for (i = TYPE_NFIELDS (t) - 1; 11436 i >= TYPE_N_BASECLASSES (t); 11437 --i) 11438 { 11439 const char *fieldname = TYPE_FIELD_NAME (t, i); 11440 11441 if (is_vtable_name (fieldname, cu)) 11442 { 11443 TYPE_VPTR_FIELDNO (type) = i; 11444 break; 11445 } 11446 } 11447 11448 /* Complain if virtual function table field not found. */ 11449 if (i < TYPE_N_BASECLASSES (t)) 11450 complaint (&symfile_complaints, 11451 _("virtual function table pointer " 11452 "not found when defining class '%s'"), 11453 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) : 11454 ""); 11455 } 11456 else 11457 { 11458 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t); 11459 } 11460 } 11461 else if (cu->producer 11462 && strncmp (cu->producer, 11463 "IBM(R) XL C/C++ Advanced Edition", 32) == 0) 11464 { 11465 /* The IBM XLC compiler does not provide direct indication 11466 of the containing type, but the vtable pointer is 11467 always named __vfp. */ 11468 11469 int i; 11470 11471 for (i = TYPE_NFIELDS (type) - 1; 11472 i >= TYPE_N_BASECLASSES (type); 11473 --i) 11474 { 11475 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0) 11476 { 11477 TYPE_VPTR_FIELDNO (type) = i; 11478 TYPE_VPTR_BASETYPE (type) = type; 11479 break; 11480 } 11481 } 11482 } 11483 } 11484 11485 /* Copy fi.typedef_field_list linked list elements content into the 11486 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */ 11487 if (fi.typedef_field_list) 11488 { 11489 int i = fi.typedef_field_list_count; 11490 11491 ALLOCATE_CPLUS_STRUCT_TYPE (type); 11492 TYPE_TYPEDEF_FIELD_ARRAY (type) 11493 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i); 11494 TYPE_TYPEDEF_FIELD_COUNT (type) = i; 11495 11496 /* Reverse the list order to keep the debug info elements order. */ 11497 while (--i >= 0) 11498 { 11499 struct typedef_field *dest, *src; 11500 11501 dest = &TYPE_TYPEDEF_FIELD (type, i); 11502 src = &fi.typedef_field_list->field; 11503 fi.typedef_field_list = fi.typedef_field_list->next; 11504 *dest = *src; 11505 } 11506 } 11507 11508 do_cleanups (back_to); 11509 11510 if (HAVE_CPLUS_STRUCT (type)) 11511 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java; 11512 } 11513 11514 quirk_gcc_member_function_pointer (type, objfile); 11515 11516 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its 11517 snapshots) has been known to create a die giving a declaration 11518 for a class that has, as a child, a die giving a definition for a 11519 nested class. So we have to process our children even if the 11520 current die is a declaration. Normally, of course, a declaration 11521 won't have any children at all. */ 11522 11523 while (child_die != NULL && child_die->tag) 11524 { 11525 if (child_die->tag == DW_TAG_member 11526 || child_die->tag == DW_TAG_variable 11527 || child_die->tag == DW_TAG_inheritance 11528 || child_die->tag == DW_TAG_template_value_param 11529 || child_die->tag == DW_TAG_template_type_param) 11530 { 11531 /* Do nothing. */ 11532 } 11533 else 11534 process_die (child_die, cu); 11535 11536 child_die = sibling_die (child_die); 11537 } 11538 11539 /* Do not consider external references. According to the DWARF standard, 11540 these DIEs are identified by the fact that they have no byte_size 11541 attribute, and a declaration attribute. */ 11542 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL 11543 || !die_is_declaration (die, cu)) 11544 new_symbol (die, type, cu); 11545 } 11546 11547 /* Given a DW_AT_enumeration_type die, set its type. We do not 11548 complete the type's fields yet, or create any symbols. */ 11549 11550 static struct type * 11551 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu) 11552 { 11553 struct objfile *objfile = cu->objfile; 11554 struct type *type; 11555 struct attribute *attr; 11556 const char *name; 11557 11558 /* If the definition of this type lives in .debug_types, read that type. 11559 Don't follow DW_AT_specification though, that will take us back up 11560 the chain and we want to go down. */ 11561 attr = dwarf2_attr_no_follow (die, DW_AT_signature); 11562 if (attr) 11563 { 11564 struct dwarf2_cu *type_cu = cu; 11565 struct die_info *type_die = follow_die_ref_or_sig (die, attr, &type_cu); 11566 11567 type = read_type_die (type_die, type_cu); 11568 11569 /* TYPE_CU may not be the same as CU. 11570 Ensure TYPE is recorded in CU's type_hash table. */ 11571 return set_die_type (die, type, cu); 11572 } 11573 11574 type = alloc_type (objfile); 11575 11576 TYPE_CODE (type) = TYPE_CODE_ENUM; 11577 name = dwarf2_full_name (NULL, die, cu); 11578 if (name != NULL) 11579 TYPE_TAG_NAME (type) = name; 11580 11581 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 11582 if (attr) 11583 { 11584 TYPE_LENGTH (type) = DW_UNSND (attr); 11585 } 11586 else 11587 { 11588 TYPE_LENGTH (type) = 0; 11589 } 11590 11591 /* The enumeration DIE can be incomplete. In Ada, any type can be 11592 declared as private in the package spec, and then defined only 11593 inside the package body. Such types are known as Taft Amendment 11594 Types. When another package uses such a type, an incomplete DIE 11595 may be generated by the compiler. */ 11596 if (die_is_declaration (die, cu)) 11597 TYPE_STUB (type) = 1; 11598 11599 return set_die_type (die, type, cu); 11600 } 11601 11602 /* Given a pointer to a die which begins an enumeration, process all 11603 the dies that define the members of the enumeration, and create the 11604 symbol for the enumeration type. 11605 11606 NOTE: We reverse the order of the element list. */ 11607 11608 static void 11609 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu) 11610 { 11611 struct type *this_type; 11612 11613 this_type = get_die_type (die, cu); 11614 if (this_type == NULL) 11615 this_type = read_enumeration_type (die, cu); 11616 11617 if (die->child != NULL) 11618 { 11619 struct die_info *child_die; 11620 struct symbol *sym; 11621 struct field *fields = NULL; 11622 int num_fields = 0; 11623 int unsigned_enum = 1; 11624 const char *name; 11625 int flag_enum = 1; 11626 ULONGEST mask = 0; 11627 11628 child_die = die->child; 11629 while (child_die && child_die->tag) 11630 { 11631 if (child_die->tag != DW_TAG_enumerator) 11632 { 11633 process_die (child_die, cu); 11634 } 11635 else 11636 { 11637 name = dwarf2_name (child_die, cu); 11638 if (name) 11639 { 11640 sym = new_symbol (child_die, this_type, cu); 11641 if (SYMBOL_VALUE (sym) < 0) 11642 { 11643 unsigned_enum = 0; 11644 flag_enum = 0; 11645 } 11646 else if ((mask & SYMBOL_VALUE (sym)) != 0) 11647 flag_enum = 0; 11648 else 11649 mask |= SYMBOL_VALUE (sym); 11650 11651 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0) 11652 { 11653 fields = (struct field *) 11654 xrealloc (fields, 11655 (num_fields + DW_FIELD_ALLOC_CHUNK) 11656 * sizeof (struct field)); 11657 } 11658 11659 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym); 11660 FIELD_TYPE (fields[num_fields]) = NULL; 11661 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym)); 11662 FIELD_BITSIZE (fields[num_fields]) = 0; 11663 11664 num_fields++; 11665 } 11666 } 11667 11668 child_die = sibling_die (child_die); 11669 } 11670 11671 if (num_fields) 11672 { 11673 TYPE_NFIELDS (this_type) = num_fields; 11674 TYPE_FIELDS (this_type) = (struct field *) 11675 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields); 11676 memcpy (TYPE_FIELDS (this_type), fields, 11677 sizeof (struct field) * num_fields); 11678 xfree (fields); 11679 } 11680 if (unsigned_enum) 11681 TYPE_UNSIGNED (this_type) = 1; 11682 if (flag_enum) 11683 TYPE_FLAG_ENUM (this_type) = 1; 11684 } 11685 11686 /* If we are reading an enum from a .debug_types unit, and the enum 11687 is a declaration, and the enum is not the signatured type in the 11688 unit, then we do not want to add a symbol for it. Adding a 11689 symbol would in some cases obscure the true definition of the 11690 enum, giving users an incomplete type when the definition is 11691 actually available. Note that we do not want to do this for all 11692 enums which are just declarations, because C++0x allows forward 11693 enum declarations. */ 11694 if (cu->per_cu->is_debug_types 11695 && die_is_declaration (die, cu)) 11696 { 11697 struct signatured_type *sig_type; 11698 11699 sig_type 11700 = lookup_signatured_type_at_offset (dwarf2_per_objfile->objfile, 11701 cu->per_cu->info_or_types_section, 11702 cu->per_cu->offset); 11703 gdb_assert (sig_type->type_offset_in_section.sect_off != 0); 11704 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off) 11705 return; 11706 } 11707 11708 new_symbol (die, this_type, cu); 11709 } 11710 11711 /* Extract all information from a DW_TAG_array_type DIE and put it in 11712 the DIE's type field. For now, this only handles one dimensional 11713 arrays. */ 11714 11715 static struct type * 11716 read_array_type (struct die_info *die, struct dwarf2_cu *cu) 11717 { 11718 struct objfile *objfile = cu->objfile; 11719 struct die_info *child_die; 11720 struct type *type; 11721 struct type *element_type, *range_type, *index_type; 11722 struct type **range_types = NULL; 11723 struct attribute *attr; 11724 int ndim = 0; 11725 struct cleanup *back_to; 11726 const char *name; 11727 11728 element_type = die_type (die, cu); 11729 11730 /* The die_type call above may have already set the type for this DIE. */ 11731 type = get_die_type (die, cu); 11732 if (type) 11733 return type; 11734 11735 /* Irix 6.2 native cc creates array types without children for 11736 arrays with unspecified length. */ 11737 if (die->child == NULL) 11738 { 11739 index_type = objfile_type (objfile)->builtin_int; 11740 range_type = create_range_type (NULL, index_type, 0, -1); 11741 type = create_array_type (NULL, element_type, range_type); 11742 return set_die_type (die, type, cu); 11743 } 11744 11745 back_to = make_cleanup (null_cleanup, NULL); 11746 child_die = die->child; 11747 while (child_die && child_die->tag) 11748 { 11749 if (child_die->tag == DW_TAG_subrange_type) 11750 { 11751 struct type *child_type = read_type_die (child_die, cu); 11752 11753 if (child_type != NULL) 11754 { 11755 /* The range type was succesfully read. Save it for the 11756 array type creation. */ 11757 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0) 11758 { 11759 range_types = (struct type **) 11760 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK) 11761 * sizeof (struct type *)); 11762 if (ndim == 0) 11763 make_cleanup (free_current_contents, &range_types); 11764 } 11765 range_types[ndim++] = child_type; 11766 } 11767 } 11768 child_die = sibling_die (child_die); 11769 } 11770 11771 /* Dwarf2 dimensions are output from left to right, create the 11772 necessary array types in backwards order. */ 11773 11774 type = element_type; 11775 11776 if (read_array_order (die, cu) == DW_ORD_col_major) 11777 { 11778 int i = 0; 11779 11780 while (i < ndim) 11781 type = create_array_type (NULL, type, range_types[i++]); 11782 } 11783 else 11784 { 11785 while (ndim-- > 0) 11786 type = create_array_type (NULL, type, range_types[ndim]); 11787 } 11788 11789 /* Understand Dwarf2 support for vector types (like they occur on 11790 the PowerPC w/ AltiVec). Gcc just adds another attribute to the 11791 array type. This is not part of the Dwarf2/3 standard yet, but a 11792 custom vendor extension. The main difference between a regular 11793 array and the vector variant is that vectors are passed by value 11794 to functions. */ 11795 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu); 11796 if (attr) 11797 make_vector_type (type); 11798 11799 /* The DIE may have DW_AT_byte_size set. For example an OpenCL 11800 implementation may choose to implement triple vectors using this 11801 attribute. */ 11802 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 11803 if (attr) 11804 { 11805 if (DW_UNSND (attr) >= TYPE_LENGTH (type)) 11806 TYPE_LENGTH (type) = DW_UNSND (attr); 11807 else 11808 complaint (&symfile_complaints, 11809 _("DW_AT_byte_size for array type smaller " 11810 "than the total size of elements")); 11811 } 11812 11813 name = dwarf2_name (die, cu); 11814 if (name) 11815 TYPE_NAME (type) = name; 11816 11817 /* Install the type in the die. */ 11818 set_die_type (die, type, cu); 11819 11820 /* set_die_type should be already done. */ 11821 set_descriptive_type (type, die, cu); 11822 11823 do_cleanups (back_to); 11824 11825 return type; 11826 } 11827 11828 static enum dwarf_array_dim_ordering 11829 read_array_order (struct die_info *die, struct dwarf2_cu *cu) 11830 { 11831 struct attribute *attr; 11832 11833 attr = dwarf2_attr (die, DW_AT_ordering, cu); 11834 11835 if (attr) return DW_SND (attr); 11836 11837 /* GNU F77 is a special case, as at 08/2004 array type info is the 11838 opposite order to the dwarf2 specification, but data is still 11839 laid out as per normal fortran. 11840 11841 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need 11842 version checking. */ 11843 11844 if (cu->language == language_fortran 11845 && cu->producer && strstr (cu->producer, "GNU F77")) 11846 { 11847 return DW_ORD_row_major; 11848 } 11849 11850 switch (cu->language_defn->la_array_ordering) 11851 { 11852 case array_column_major: 11853 return DW_ORD_col_major; 11854 case array_row_major: 11855 default: 11856 return DW_ORD_row_major; 11857 }; 11858 } 11859 11860 /* Extract all information from a DW_TAG_set_type DIE and put it in 11861 the DIE's type field. */ 11862 11863 static struct type * 11864 read_set_type (struct die_info *die, struct dwarf2_cu *cu) 11865 { 11866 struct type *domain_type, *set_type; 11867 struct attribute *attr; 11868 11869 domain_type = die_type (die, cu); 11870 11871 /* The die_type call above may have already set the type for this DIE. */ 11872 set_type = get_die_type (die, cu); 11873 if (set_type) 11874 return set_type; 11875 11876 set_type = create_set_type (NULL, domain_type); 11877 11878 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 11879 if (attr) 11880 TYPE_LENGTH (set_type) = DW_UNSND (attr); 11881 11882 return set_die_type (die, set_type, cu); 11883 } 11884 11885 /* A helper for read_common_block that creates a locexpr baton. 11886 SYM is the symbol which we are marking as computed. 11887 COMMON_DIE is the DIE for the common block. 11888 COMMON_LOC is the location expression attribute for the common 11889 block itself. 11890 MEMBER_LOC is the location expression attribute for the particular 11891 member of the common block that we are processing. 11892 CU is the CU from which the above come. */ 11893 11894 static void 11895 mark_common_block_symbol_computed (struct symbol *sym, 11896 struct die_info *common_die, 11897 struct attribute *common_loc, 11898 struct attribute *member_loc, 11899 struct dwarf2_cu *cu) 11900 { 11901 struct objfile *objfile = dwarf2_per_objfile->objfile; 11902 struct dwarf2_locexpr_baton *baton; 11903 gdb_byte *ptr; 11904 unsigned int cu_off; 11905 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile)); 11906 LONGEST offset = 0; 11907 11908 gdb_assert (common_loc && member_loc); 11909 gdb_assert (attr_form_is_block (common_loc)); 11910 gdb_assert (attr_form_is_block (member_loc) 11911 || attr_form_is_constant (member_loc)); 11912 11913 baton = obstack_alloc (&objfile->objfile_obstack, 11914 sizeof (struct dwarf2_locexpr_baton)); 11915 baton->per_cu = cu->per_cu; 11916 gdb_assert (baton->per_cu); 11917 11918 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */; 11919 11920 if (attr_form_is_constant (member_loc)) 11921 { 11922 offset = dwarf2_get_attr_constant_value (member_loc, 0); 11923 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size; 11924 } 11925 else 11926 baton->size += DW_BLOCK (member_loc)->size; 11927 11928 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size); 11929 baton->data = ptr; 11930 11931 *ptr++ = DW_OP_call4; 11932 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off; 11933 store_unsigned_integer (ptr, 4, byte_order, cu_off); 11934 ptr += 4; 11935 11936 if (attr_form_is_constant (member_loc)) 11937 { 11938 *ptr++ = DW_OP_addr; 11939 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset); 11940 ptr += cu->header.addr_size; 11941 } 11942 else 11943 { 11944 /* We have to copy the data here, because DW_OP_call4 will only 11945 use a DW_AT_location attribute. */ 11946 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size); 11947 ptr += DW_BLOCK (member_loc)->size; 11948 } 11949 11950 *ptr++ = DW_OP_plus; 11951 gdb_assert (ptr - baton->data == baton->size); 11952 11953 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs; 11954 SYMBOL_LOCATION_BATON (sym) = baton; 11955 SYMBOL_CLASS (sym) = LOC_COMPUTED; 11956 } 11957 11958 /* Create appropriate locally-scoped variables for all the 11959 DW_TAG_common_block entries. Also create a struct common_block 11960 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN 11961 is used to sepate the common blocks name namespace from regular 11962 variable names. */ 11963 11964 static void 11965 read_common_block (struct die_info *die, struct dwarf2_cu *cu) 11966 { 11967 struct attribute *attr; 11968 11969 attr = dwarf2_attr (die, DW_AT_location, cu); 11970 if (attr) 11971 { 11972 /* Support the .debug_loc offsets. */ 11973 if (attr_form_is_block (attr)) 11974 { 11975 /* Ok. */ 11976 } 11977 else if (attr_form_is_section_offset (attr)) 11978 { 11979 dwarf2_complex_location_expr_complaint (); 11980 attr = NULL; 11981 } 11982 else 11983 { 11984 dwarf2_invalid_attrib_class_complaint ("DW_AT_location", 11985 "common block member"); 11986 attr = NULL; 11987 } 11988 } 11989 11990 if (die->child != NULL) 11991 { 11992 struct objfile *objfile = cu->objfile; 11993 struct die_info *child_die; 11994 size_t n_entries = 0, size; 11995 struct common_block *common_block; 11996 struct symbol *sym; 11997 11998 for (child_die = die->child; 11999 child_die && child_die->tag; 12000 child_die = sibling_die (child_die)) 12001 ++n_entries; 12002 12003 size = (sizeof (struct common_block) 12004 + (n_entries - 1) * sizeof (struct symbol *)); 12005 common_block = obstack_alloc (&objfile->objfile_obstack, size); 12006 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *)); 12007 common_block->n_entries = 0; 12008 12009 for (child_die = die->child; 12010 child_die && child_die->tag; 12011 child_die = sibling_die (child_die)) 12012 { 12013 /* Create the symbol in the DW_TAG_common_block block in the current 12014 symbol scope. */ 12015 sym = new_symbol (child_die, NULL, cu); 12016 if (sym != NULL) 12017 { 12018 struct attribute *member_loc; 12019 12020 common_block->contents[common_block->n_entries++] = sym; 12021 12022 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location, 12023 cu); 12024 if (member_loc) 12025 { 12026 /* GDB has handled this for a long time, but it is 12027 not specified by DWARF. It seems to have been 12028 emitted by gfortran at least as recently as: 12029 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */ 12030 complaint (&symfile_complaints, 12031 _("Variable in common block has " 12032 "DW_AT_data_member_location " 12033 "- DIE at 0x%x [in module %s]"), 12034 child_die->offset.sect_off, cu->objfile->name); 12035 12036 if (attr_form_is_section_offset (member_loc)) 12037 dwarf2_complex_location_expr_complaint (); 12038 else if (attr_form_is_constant (member_loc) 12039 || attr_form_is_block (member_loc)) 12040 { 12041 if (attr) 12042 mark_common_block_symbol_computed (sym, die, attr, 12043 member_loc, cu); 12044 } 12045 else 12046 dwarf2_complex_location_expr_complaint (); 12047 } 12048 } 12049 } 12050 12051 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu); 12052 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block; 12053 } 12054 } 12055 12056 /* Create a type for a C++ namespace. */ 12057 12058 static struct type * 12059 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu) 12060 { 12061 struct objfile *objfile = cu->objfile; 12062 const char *previous_prefix, *name; 12063 int is_anonymous; 12064 struct type *type; 12065 12066 /* For extensions, reuse the type of the original namespace. */ 12067 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL) 12068 { 12069 struct die_info *ext_die; 12070 struct dwarf2_cu *ext_cu = cu; 12071 12072 ext_die = dwarf2_extension (die, &ext_cu); 12073 type = read_type_die (ext_die, ext_cu); 12074 12075 /* EXT_CU may not be the same as CU. 12076 Ensure TYPE is recorded in CU's type_hash table. */ 12077 return set_die_type (die, type, cu); 12078 } 12079 12080 name = namespace_name (die, &is_anonymous, cu); 12081 12082 /* Now build the name of the current namespace. */ 12083 12084 previous_prefix = determine_prefix (die, cu); 12085 if (previous_prefix[0] != '\0') 12086 name = typename_concat (&objfile->objfile_obstack, 12087 previous_prefix, name, 0, cu); 12088 12089 /* Create the type. */ 12090 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL, 12091 objfile); 12092 TYPE_NAME (type) = name; 12093 TYPE_TAG_NAME (type) = TYPE_NAME (type); 12094 12095 return set_die_type (die, type, cu); 12096 } 12097 12098 /* Read a C++ namespace. */ 12099 12100 static void 12101 read_namespace (struct die_info *die, struct dwarf2_cu *cu) 12102 { 12103 struct objfile *objfile = cu->objfile; 12104 int is_anonymous; 12105 12106 /* Add a symbol associated to this if we haven't seen the namespace 12107 before. Also, add a using directive if it's an anonymous 12108 namespace. */ 12109 12110 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL) 12111 { 12112 struct type *type; 12113 12114 type = read_type_die (die, cu); 12115 new_symbol (die, type, cu); 12116 12117 namespace_name (die, &is_anonymous, cu); 12118 if (is_anonymous) 12119 { 12120 const char *previous_prefix = determine_prefix (die, cu); 12121 12122 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL, 12123 NULL, NULL, 0, &objfile->objfile_obstack); 12124 } 12125 } 12126 12127 if (die->child != NULL) 12128 { 12129 struct die_info *child_die = die->child; 12130 12131 while (child_die && child_die->tag) 12132 { 12133 process_die (child_die, cu); 12134 child_die = sibling_die (child_die); 12135 } 12136 } 12137 } 12138 12139 /* Read a Fortran module as type. This DIE can be only a declaration used for 12140 imported module. Still we need that type as local Fortran "use ... only" 12141 declaration imports depend on the created type in determine_prefix. */ 12142 12143 static struct type * 12144 read_module_type (struct die_info *die, struct dwarf2_cu *cu) 12145 { 12146 struct objfile *objfile = cu->objfile; 12147 const char *module_name; 12148 struct type *type; 12149 12150 module_name = dwarf2_name (die, cu); 12151 if (!module_name) 12152 complaint (&symfile_complaints, 12153 _("DW_TAG_module has no name, offset 0x%x"), 12154 die->offset.sect_off); 12155 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile); 12156 12157 /* determine_prefix uses TYPE_TAG_NAME. */ 12158 TYPE_TAG_NAME (type) = TYPE_NAME (type); 12159 12160 return set_die_type (die, type, cu); 12161 } 12162 12163 /* Read a Fortran module. */ 12164 12165 static void 12166 read_module (struct die_info *die, struct dwarf2_cu *cu) 12167 { 12168 struct die_info *child_die = die->child; 12169 12170 while (child_die && child_die->tag) 12171 { 12172 process_die (child_die, cu); 12173 child_die = sibling_die (child_die); 12174 } 12175 } 12176 12177 /* Return the name of the namespace represented by DIE. Set 12178 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous 12179 namespace. */ 12180 12181 static const char * 12182 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu) 12183 { 12184 struct die_info *current_die; 12185 const char *name = NULL; 12186 12187 /* Loop through the extensions until we find a name. */ 12188 12189 for (current_die = die; 12190 current_die != NULL; 12191 current_die = dwarf2_extension (die, &cu)) 12192 { 12193 name = dwarf2_name (current_die, cu); 12194 if (name != NULL) 12195 break; 12196 } 12197 12198 /* Is it an anonymous namespace? */ 12199 12200 *is_anonymous = (name == NULL); 12201 if (*is_anonymous) 12202 name = CP_ANONYMOUS_NAMESPACE_STR; 12203 12204 return name; 12205 } 12206 12207 /* Extract all information from a DW_TAG_pointer_type DIE and add to 12208 the user defined type vector. */ 12209 12210 static struct type * 12211 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu) 12212 { 12213 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile); 12214 struct comp_unit_head *cu_header = &cu->header; 12215 struct type *type; 12216 struct attribute *attr_byte_size; 12217 struct attribute *attr_address_class; 12218 int byte_size, addr_class; 12219 struct type *target_type; 12220 12221 target_type = die_type (die, cu); 12222 12223 /* The die_type call above may have already set the type for this DIE. */ 12224 type = get_die_type (die, cu); 12225 if (type) 12226 return type; 12227 12228 type = lookup_pointer_type (target_type); 12229 12230 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu); 12231 if (attr_byte_size) 12232 byte_size = DW_UNSND (attr_byte_size); 12233 else 12234 byte_size = cu_header->addr_size; 12235 12236 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu); 12237 if (attr_address_class) 12238 addr_class = DW_UNSND (attr_address_class); 12239 else 12240 addr_class = DW_ADDR_none; 12241 12242 /* If the pointer size or address class is different than the 12243 default, create a type variant marked as such and set the 12244 length accordingly. */ 12245 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none) 12246 { 12247 if (gdbarch_address_class_type_flags_p (gdbarch)) 12248 { 12249 int type_flags; 12250 12251 type_flags = gdbarch_address_class_type_flags 12252 (gdbarch, byte_size, addr_class); 12253 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL) 12254 == 0); 12255 type = make_type_with_address_space (type, type_flags); 12256 } 12257 else if (TYPE_LENGTH (type) != byte_size) 12258 { 12259 complaint (&symfile_complaints, 12260 _("invalid pointer size %d"), byte_size); 12261 } 12262 else 12263 { 12264 /* Should we also complain about unhandled address classes? */ 12265 } 12266 } 12267 12268 TYPE_LENGTH (type) = byte_size; 12269 return set_die_type (die, type, cu); 12270 } 12271 12272 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to 12273 the user defined type vector. */ 12274 12275 static struct type * 12276 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu) 12277 { 12278 struct type *type; 12279 struct type *to_type; 12280 struct type *domain; 12281 12282 to_type = die_type (die, cu); 12283 domain = die_containing_type (die, cu); 12284 12285 /* The calls above may have already set the type for this DIE. */ 12286 type = get_die_type (die, cu); 12287 if (type) 12288 return type; 12289 12290 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD) 12291 type = lookup_methodptr_type (to_type); 12292 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC) 12293 { 12294 struct type *new_type = alloc_type (cu->objfile); 12295 12296 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type), 12297 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type), 12298 TYPE_VARARGS (to_type)); 12299 type = lookup_methodptr_type (new_type); 12300 } 12301 else 12302 type = lookup_memberptr_type (to_type, domain); 12303 12304 return set_die_type (die, type, cu); 12305 } 12306 12307 /* Extract all information from a DW_TAG_reference_type DIE and add to 12308 the user defined type vector. */ 12309 12310 static struct type * 12311 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu) 12312 { 12313 struct comp_unit_head *cu_header = &cu->header; 12314 struct type *type, *target_type; 12315 struct attribute *attr; 12316 12317 target_type = die_type (die, cu); 12318 12319 /* The die_type call above may have already set the type for this DIE. */ 12320 type = get_die_type (die, cu); 12321 if (type) 12322 return type; 12323 12324 type = lookup_reference_type (target_type); 12325 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 12326 if (attr) 12327 { 12328 TYPE_LENGTH (type) = DW_UNSND (attr); 12329 } 12330 else 12331 { 12332 TYPE_LENGTH (type) = cu_header->addr_size; 12333 } 12334 return set_die_type (die, type, cu); 12335 } 12336 12337 static struct type * 12338 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu) 12339 { 12340 struct type *base_type, *cv_type; 12341 12342 base_type = die_type (die, cu); 12343 12344 /* The die_type call above may have already set the type for this DIE. */ 12345 cv_type = get_die_type (die, cu); 12346 if (cv_type) 12347 return cv_type; 12348 12349 /* In case the const qualifier is applied to an array type, the element type 12350 is so qualified, not the array type (section 6.7.3 of C99). */ 12351 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY) 12352 { 12353 struct type *el_type, *inner_array; 12354 12355 base_type = copy_type (base_type); 12356 inner_array = base_type; 12357 12358 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY) 12359 { 12360 TYPE_TARGET_TYPE (inner_array) = 12361 copy_type (TYPE_TARGET_TYPE (inner_array)); 12362 inner_array = TYPE_TARGET_TYPE (inner_array); 12363 } 12364 12365 el_type = TYPE_TARGET_TYPE (inner_array); 12366 TYPE_TARGET_TYPE (inner_array) = 12367 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL); 12368 12369 return set_die_type (die, base_type, cu); 12370 } 12371 12372 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0); 12373 return set_die_type (die, cv_type, cu); 12374 } 12375 12376 static struct type * 12377 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu) 12378 { 12379 struct type *base_type, *cv_type; 12380 12381 base_type = die_type (die, cu); 12382 12383 /* The die_type call above may have already set the type for this DIE. */ 12384 cv_type = get_die_type (die, cu); 12385 if (cv_type) 12386 return cv_type; 12387 12388 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0); 12389 return set_die_type (die, cv_type, cu); 12390 } 12391 12392 /* Handle DW_TAG_restrict_type. */ 12393 12394 static struct type * 12395 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu) 12396 { 12397 struct type *base_type, *cv_type; 12398 12399 base_type = die_type (die, cu); 12400 12401 /* The die_type call above may have already set the type for this DIE. */ 12402 cv_type = get_die_type (die, cu); 12403 if (cv_type) 12404 return cv_type; 12405 12406 cv_type = make_restrict_type (base_type); 12407 return set_die_type (die, cv_type, cu); 12408 } 12409 12410 /* Extract all information from a DW_TAG_string_type DIE and add to 12411 the user defined type vector. It isn't really a user defined type, 12412 but it behaves like one, with other DIE's using an AT_user_def_type 12413 attribute to reference it. */ 12414 12415 static struct type * 12416 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu) 12417 { 12418 struct objfile *objfile = cu->objfile; 12419 struct gdbarch *gdbarch = get_objfile_arch (objfile); 12420 struct type *type, *range_type, *index_type, *char_type; 12421 struct attribute *attr; 12422 unsigned int length; 12423 12424 attr = dwarf2_attr (die, DW_AT_string_length, cu); 12425 if (attr) 12426 { 12427 length = DW_UNSND (attr); 12428 } 12429 else 12430 { 12431 /* Check for the DW_AT_byte_size attribute. */ 12432 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 12433 if (attr) 12434 { 12435 length = DW_UNSND (attr); 12436 } 12437 else 12438 { 12439 length = 1; 12440 } 12441 } 12442 12443 index_type = objfile_type (objfile)->builtin_int; 12444 range_type = create_range_type (NULL, index_type, 1, length); 12445 char_type = language_string_char_type (cu->language_defn, gdbarch); 12446 type = create_string_type (NULL, char_type, range_type); 12447 12448 return set_die_type (die, type, cu); 12449 } 12450 12451 /* Handle DIES due to C code like: 12452 12453 struct foo 12454 { 12455 int (*funcp)(int a, long l); 12456 int b; 12457 }; 12458 12459 ('funcp' generates a DW_TAG_subroutine_type DIE). */ 12460 12461 static struct type * 12462 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu) 12463 { 12464 struct objfile *objfile = cu->objfile; 12465 struct type *type; /* Type that this function returns. */ 12466 struct type *ftype; /* Function that returns above type. */ 12467 struct attribute *attr; 12468 12469 type = die_type (die, cu); 12470 12471 /* The die_type call above may have already set the type for this DIE. */ 12472 ftype = get_die_type (die, cu); 12473 if (ftype) 12474 return ftype; 12475 12476 ftype = lookup_function_type (type); 12477 12478 /* All functions in C++, Pascal and Java have prototypes. */ 12479 attr = dwarf2_attr (die, DW_AT_prototyped, cu); 12480 if ((attr && (DW_UNSND (attr) != 0)) 12481 || cu->language == language_cplus 12482 || cu->language == language_java 12483 || cu->language == language_pascal) 12484 TYPE_PROTOTYPED (ftype) = 1; 12485 else if (producer_is_realview (cu->producer)) 12486 /* RealView does not emit DW_AT_prototyped. We can not 12487 distinguish prototyped and unprototyped functions; default to 12488 prototyped, since that is more common in modern code (and 12489 RealView warns about unprototyped functions). */ 12490 TYPE_PROTOTYPED (ftype) = 1; 12491 12492 /* Store the calling convention in the type if it's available in 12493 the subroutine die. Otherwise set the calling convention to 12494 the default value DW_CC_normal. */ 12495 attr = dwarf2_attr (die, DW_AT_calling_convention, cu); 12496 if (attr) 12497 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr); 12498 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL")) 12499 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL; 12500 else 12501 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal; 12502 12503 /* We need to add the subroutine type to the die immediately so 12504 we don't infinitely recurse when dealing with parameters 12505 declared as the same subroutine type. */ 12506 set_die_type (die, ftype, cu); 12507 12508 if (die->child != NULL) 12509 { 12510 struct type *void_type = objfile_type (objfile)->builtin_void; 12511 struct die_info *child_die; 12512 int nparams, iparams; 12513 12514 /* Count the number of parameters. 12515 FIXME: GDB currently ignores vararg functions, but knows about 12516 vararg member functions. */ 12517 nparams = 0; 12518 child_die = die->child; 12519 while (child_die && child_die->tag) 12520 { 12521 if (child_die->tag == DW_TAG_formal_parameter) 12522 nparams++; 12523 else if (child_die->tag == DW_TAG_unspecified_parameters) 12524 TYPE_VARARGS (ftype) = 1; 12525 child_die = sibling_die (child_die); 12526 } 12527 12528 /* Allocate storage for parameters and fill them in. */ 12529 TYPE_NFIELDS (ftype) = nparams; 12530 TYPE_FIELDS (ftype) = (struct field *) 12531 TYPE_ZALLOC (ftype, nparams * sizeof (struct field)); 12532 12533 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it 12534 even if we error out during the parameters reading below. */ 12535 for (iparams = 0; iparams < nparams; iparams++) 12536 TYPE_FIELD_TYPE (ftype, iparams) = void_type; 12537 12538 iparams = 0; 12539 child_die = die->child; 12540 while (child_die && child_die->tag) 12541 { 12542 if (child_die->tag == DW_TAG_formal_parameter) 12543 { 12544 struct type *arg_type; 12545 12546 /* DWARF version 2 has no clean way to discern C++ 12547 static and non-static member functions. G++ helps 12548 GDB by marking the first parameter for non-static 12549 member functions (which is the this pointer) as 12550 artificial. We pass this information to 12551 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL. 12552 12553 DWARF version 3 added DW_AT_object_pointer, which GCC 12554 4.5 does not yet generate. */ 12555 attr = dwarf2_attr (child_die, DW_AT_artificial, cu); 12556 if (attr) 12557 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr); 12558 else 12559 { 12560 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0; 12561 12562 /* GCC/43521: In java, the formal parameter 12563 "this" is sometimes not marked with DW_AT_artificial. */ 12564 if (cu->language == language_java) 12565 { 12566 const char *name = dwarf2_name (child_die, cu); 12567 12568 if (name && !strcmp (name, "this")) 12569 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1; 12570 } 12571 } 12572 arg_type = die_type (child_die, cu); 12573 12574 /* RealView does not mark THIS as const, which the testsuite 12575 expects. GCC marks THIS as const in method definitions, 12576 but not in the class specifications (GCC PR 43053). */ 12577 if (cu->language == language_cplus && !TYPE_CONST (arg_type) 12578 && TYPE_FIELD_ARTIFICIAL (ftype, iparams)) 12579 { 12580 int is_this = 0; 12581 struct dwarf2_cu *arg_cu = cu; 12582 const char *name = dwarf2_name (child_die, cu); 12583 12584 attr = dwarf2_attr (die, DW_AT_object_pointer, cu); 12585 if (attr) 12586 { 12587 /* If the compiler emits this, use it. */ 12588 if (follow_die_ref (die, attr, &arg_cu) == child_die) 12589 is_this = 1; 12590 } 12591 else if (name && strcmp (name, "this") == 0) 12592 /* Function definitions will have the argument names. */ 12593 is_this = 1; 12594 else if (name == NULL && iparams == 0) 12595 /* Declarations may not have the names, so like 12596 elsewhere in GDB, assume an artificial first 12597 argument is "this". */ 12598 is_this = 1; 12599 12600 if (is_this) 12601 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type), 12602 arg_type, 0); 12603 } 12604 12605 TYPE_FIELD_TYPE (ftype, iparams) = arg_type; 12606 iparams++; 12607 } 12608 child_die = sibling_die (child_die); 12609 } 12610 } 12611 12612 return ftype; 12613 } 12614 12615 static struct type * 12616 read_typedef (struct die_info *die, struct dwarf2_cu *cu) 12617 { 12618 struct objfile *objfile = cu->objfile; 12619 const char *name = NULL; 12620 struct type *this_type, *target_type; 12621 12622 name = dwarf2_full_name (NULL, die, cu); 12623 this_type = init_type (TYPE_CODE_TYPEDEF, 0, 12624 TYPE_FLAG_TARGET_STUB, NULL, objfile); 12625 TYPE_NAME (this_type) = name; 12626 set_die_type (die, this_type, cu); 12627 target_type = die_type (die, cu); 12628 if (target_type != this_type) 12629 TYPE_TARGET_TYPE (this_type) = target_type; 12630 else 12631 { 12632 /* Self-referential typedefs are, it seems, not allowed by the DWARF 12633 spec and cause infinite loops in GDB. */ 12634 complaint (&symfile_complaints, 12635 _("Self-referential DW_TAG_typedef " 12636 "- DIE at 0x%x [in module %s]"), 12637 die->offset.sect_off, objfile->name); 12638 TYPE_TARGET_TYPE (this_type) = NULL; 12639 } 12640 return this_type; 12641 } 12642 12643 /* Find a representation of a given base type and install 12644 it in the TYPE field of the die. */ 12645 12646 static struct type * 12647 read_base_type (struct die_info *die, struct dwarf2_cu *cu) 12648 { 12649 struct objfile *objfile = cu->objfile; 12650 struct type *type; 12651 struct attribute *attr; 12652 int encoding = 0, size = 0; 12653 const char *name; 12654 enum type_code code = TYPE_CODE_INT; 12655 int type_flags = 0; 12656 struct type *target_type = NULL; 12657 12658 attr = dwarf2_attr (die, DW_AT_encoding, cu); 12659 if (attr) 12660 { 12661 encoding = DW_UNSND (attr); 12662 } 12663 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 12664 if (attr) 12665 { 12666 size = DW_UNSND (attr); 12667 } 12668 name = dwarf2_name (die, cu); 12669 if (!name) 12670 { 12671 complaint (&symfile_complaints, 12672 _("DW_AT_name missing from DW_TAG_base_type")); 12673 } 12674 12675 switch (encoding) 12676 { 12677 case DW_ATE_address: 12678 /* Turn DW_ATE_address into a void * pointer. */ 12679 code = TYPE_CODE_PTR; 12680 type_flags |= TYPE_FLAG_UNSIGNED; 12681 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile); 12682 break; 12683 case DW_ATE_boolean: 12684 code = TYPE_CODE_BOOL; 12685 type_flags |= TYPE_FLAG_UNSIGNED; 12686 break; 12687 case DW_ATE_complex_float: 12688 code = TYPE_CODE_COMPLEX; 12689 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile); 12690 break; 12691 case DW_ATE_decimal_float: 12692 code = TYPE_CODE_DECFLOAT; 12693 break; 12694 case DW_ATE_float: 12695 code = TYPE_CODE_FLT; 12696 break; 12697 case DW_ATE_signed: 12698 break; 12699 case DW_ATE_unsigned: 12700 type_flags |= TYPE_FLAG_UNSIGNED; 12701 if (cu->language == language_fortran 12702 && name 12703 && strncmp (name, "character(", sizeof ("character(") - 1) == 0) 12704 code = TYPE_CODE_CHAR; 12705 break; 12706 case DW_ATE_signed_char: 12707 if (cu->language == language_ada || cu->language == language_m2 12708 || cu->language == language_pascal 12709 || cu->language == language_fortran) 12710 code = TYPE_CODE_CHAR; 12711 break; 12712 case DW_ATE_unsigned_char: 12713 if (cu->language == language_ada || cu->language == language_m2 12714 || cu->language == language_pascal 12715 || cu->language == language_fortran) 12716 code = TYPE_CODE_CHAR; 12717 type_flags |= TYPE_FLAG_UNSIGNED; 12718 break; 12719 case DW_ATE_UTF: 12720 /* We just treat this as an integer and then recognize the 12721 type by name elsewhere. */ 12722 break; 12723 12724 default: 12725 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"), 12726 dwarf_type_encoding_name (encoding)); 12727 break; 12728 } 12729 12730 type = init_type (code, size, type_flags, NULL, objfile); 12731 TYPE_NAME (type) = name; 12732 TYPE_TARGET_TYPE (type) = target_type; 12733 12734 if (name && strcmp (name, "char") == 0) 12735 TYPE_NOSIGN (type) = 1; 12736 12737 return set_die_type (die, type, cu); 12738 } 12739 12740 /* Read the given DW_AT_subrange DIE. */ 12741 12742 static struct type * 12743 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu) 12744 { 12745 struct type *base_type, *orig_base_type; 12746 struct type *range_type; 12747 struct attribute *attr; 12748 LONGEST low, high; 12749 int low_default_is_valid; 12750 const char *name; 12751 LONGEST negative_mask; 12752 12753 orig_base_type = die_type (die, cu); 12754 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED, 12755 whereas the real type might be. So, we use ORIG_BASE_TYPE when 12756 creating the range type, but we use the result of check_typedef 12757 when examining properties of the type. */ 12758 base_type = check_typedef (orig_base_type); 12759 12760 /* The die_type call above may have already set the type for this DIE. */ 12761 range_type = get_die_type (die, cu); 12762 if (range_type) 12763 return range_type; 12764 12765 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow 12766 omitting DW_AT_lower_bound. */ 12767 switch (cu->language) 12768 { 12769 case language_c: 12770 case language_cplus: 12771 low = 0; 12772 low_default_is_valid = 1; 12773 break; 12774 case language_fortran: 12775 low = 1; 12776 low_default_is_valid = 1; 12777 break; 12778 case language_d: 12779 case language_java: 12780 case language_objc: 12781 low = 0; 12782 low_default_is_valid = (cu->header.version >= 4); 12783 break; 12784 case language_ada: 12785 case language_m2: 12786 case language_pascal: 12787 low = 1; 12788 low_default_is_valid = (cu->header.version >= 4); 12789 break; 12790 default: 12791 low = 0; 12792 low_default_is_valid = 0; 12793 break; 12794 } 12795 12796 /* FIXME: For variable sized arrays either of these could be 12797 a variable rather than a constant value. We'll allow it, 12798 but we don't know how to handle it. */ 12799 attr = dwarf2_attr (die, DW_AT_lower_bound, cu); 12800 if (attr) 12801 low = dwarf2_get_attr_constant_value (attr, low); 12802 else if (!low_default_is_valid) 12803 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound " 12804 "- DIE at 0x%x [in module %s]"), 12805 die->offset.sect_off, cu->objfile->name); 12806 12807 attr = dwarf2_attr (die, DW_AT_upper_bound, cu); 12808 if (attr) 12809 { 12810 if (attr_form_is_block (attr) || is_ref_attr (attr)) 12811 { 12812 /* GCC encodes arrays with unspecified or dynamic length 12813 with a DW_FORM_block1 attribute or a reference attribute. 12814 FIXME: GDB does not yet know how to handle dynamic 12815 arrays properly, treat them as arrays with unspecified 12816 length for now. 12817 12818 FIXME: jimb/2003-09-22: GDB does not really know 12819 how to handle arrays of unspecified length 12820 either; we just represent them as zero-length 12821 arrays. Choose an appropriate upper bound given 12822 the lower bound we've computed above. */ 12823 high = low - 1; 12824 } 12825 else 12826 high = dwarf2_get_attr_constant_value (attr, 1); 12827 } 12828 else 12829 { 12830 attr = dwarf2_attr (die, DW_AT_count, cu); 12831 if (attr) 12832 { 12833 int count = dwarf2_get_attr_constant_value (attr, 1); 12834 high = low + count - 1; 12835 } 12836 else 12837 { 12838 /* Unspecified array length. */ 12839 high = low - 1; 12840 } 12841 } 12842 12843 /* Dwarf-2 specifications explicitly allows to create subrange types 12844 without specifying a base type. 12845 In that case, the base type must be set to the type of 12846 the lower bound, upper bound or count, in that order, if any of these 12847 three attributes references an object that has a type. 12848 If no base type is found, the Dwarf-2 specifications say that 12849 a signed integer type of size equal to the size of an address should 12850 be used. 12851 For the following C code: `extern char gdb_int [];' 12852 GCC produces an empty range DIE. 12853 FIXME: muller/2010-05-28: Possible references to object for low bound, 12854 high bound or count are not yet handled by this code. */ 12855 if (TYPE_CODE (base_type) == TYPE_CODE_VOID) 12856 { 12857 struct objfile *objfile = cu->objfile; 12858 struct gdbarch *gdbarch = get_objfile_arch (objfile); 12859 int addr_size = gdbarch_addr_bit (gdbarch) /8; 12860 struct type *int_type = objfile_type (objfile)->builtin_int; 12861 12862 /* Test "int", "long int", and "long long int" objfile types, 12863 and select the first one having a size above or equal to the 12864 architecture address size. */ 12865 if (int_type && TYPE_LENGTH (int_type) >= addr_size) 12866 base_type = int_type; 12867 else 12868 { 12869 int_type = objfile_type (objfile)->builtin_long; 12870 if (int_type && TYPE_LENGTH (int_type) >= addr_size) 12871 base_type = int_type; 12872 else 12873 { 12874 int_type = objfile_type (objfile)->builtin_long_long; 12875 if (int_type && TYPE_LENGTH (int_type) >= addr_size) 12876 base_type = int_type; 12877 } 12878 } 12879 } 12880 12881 negative_mask = 12882 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1); 12883 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask)) 12884 low |= negative_mask; 12885 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask)) 12886 high |= negative_mask; 12887 12888 range_type = create_range_type (NULL, orig_base_type, low, high); 12889 12890 /* Mark arrays with dynamic length at least as an array of unspecified 12891 length. GDB could check the boundary but before it gets implemented at 12892 least allow accessing the array elements. */ 12893 if (attr && attr_form_is_block (attr)) 12894 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1; 12895 12896 /* Ada expects an empty array on no boundary attributes. */ 12897 if (attr == NULL && cu->language != language_ada) 12898 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1; 12899 12900 name = dwarf2_name (die, cu); 12901 if (name) 12902 TYPE_NAME (range_type) = name; 12903 12904 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 12905 if (attr) 12906 TYPE_LENGTH (range_type) = DW_UNSND (attr); 12907 12908 set_die_type (die, range_type, cu); 12909 12910 /* set_die_type should be already done. */ 12911 set_descriptive_type (range_type, die, cu); 12912 12913 return range_type; 12914 } 12915 12916 static struct type * 12917 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu) 12918 { 12919 struct type *type; 12920 12921 /* For now, we only support the C meaning of an unspecified type: void. */ 12922 12923 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile); 12924 TYPE_NAME (type) = dwarf2_name (die, cu); 12925 12926 return set_die_type (die, type, cu); 12927 } 12928 12929 /* Read a single die and all its descendents. Set the die's sibling 12930 field to NULL; set other fields in the die correctly, and set all 12931 of the descendents' fields correctly. Set *NEW_INFO_PTR to the 12932 location of the info_ptr after reading all of those dies. PARENT 12933 is the parent of the die in question. */ 12934 12935 static struct die_info * 12936 read_die_and_children (const struct die_reader_specs *reader, 12937 gdb_byte *info_ptr, 12938 gdb_byte **new_info_ptr, 12939 struct die_info *parent) 12940 { 12941 struct die_info *die; 12942 gdb_byte *cur_ptr; 12943 int has_children; 12944 12945 cur_ptr = read_full_die (reader, &die, info_ptr, &has_children); 12946 if (die == NULL) 12947 { 12948 *new_info_ptr = cur_ptr; 12949 return NULL; 12950 } 12951 store_in_ref_table (die, reader->cu); 12952 12953 if (has_children) 12954 die->child = read_die_and_siblings (reader, cur_ptr, new_info_ptr, die); 12955 else 12956 { 12957 die->child = NULL; 12958 *new_info_ptr = cur_ptr; 12959 } 12960 12961 die->sibling = NULL; 12962 die->parent = parent; 12963 return die; 12964 } 12965 12966 /* Read a die, all of its descendents, and all of its siblings; set 12967 all of the fields of all of the dies correctly. Arguments are as 12968 in read_die_and_children. */ 12969 12970 static struct die_info * 12971 read_die_and_siblings (const struct die_reader_specs *reader, 12972 gdb_byte *info_ptr, 12973 gdb_byte **new_info_ptr, 12974 struct die_info *parent) 12975 { 12976 struct die_info *first_die, *last_sibling; 12977 gdb_byte *cur_ptr; 12978 12979 cur_ptr = info_ptr; 12980 first_die = last_sibling = NULL; 12981 12982 while (1) 12983 { 12984 struct die_info *die 12985 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent); 12986 12987 if (die == NULL) 12988 { 12989 *new_info_ptr = cur_ptr; 12990 return first_die; 12991 } 12992 12993 if (!first_die) 12994 first_die = die; 12995 else 12996 last_sibling->sibling = die; 12997 12998 last_sibling = die; 12999 } 13000 } 13001 13002 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS 13003 attributes. 13004 The caller is responsible for filling in the extra attributes 13005 and updating (*DIEP)->num_attrs. 13006 Set DIEP to point to a newly allocated die with its information, 13007 except for its child, sibling, and parent fields. 13008 Set HAS_CHILDREN to tell whether the die has children or not. */ 13009 13010 static gdb_byte * 13011 read_full_die_1 (const struct die_reader_specs *reader, 13012 struct die_info **diep, gdb_byte *info_ptr, 13013 int *has_children, int num_extra_attrs) 13014 { 13015 unsigned int abbrev_number, bytes_read, i; 13016 sect_offset offset; 13017 struct abbrev_info *abbrev; 13018 struct die_info *die; 13019 struct dwarf2_cu *cu = reader->cu; 13020 bfd *abfd = reader->abfd; 13021 13022 offset.sect_off = info_ptr - reader->buffer; 13023 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 13024 info_ptr += bytes_read; 13025 if (!abbrev_number) 13026 { 13027 *diep = NULL; 13028 *has_children = 0; 13029 return info_ptr; 13030 } 13031 13032 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number); 13033 if (!abbrev) 13034 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"), 13035 abbrev_number, 13036 bfd_get_filename (abfd)); 13037 13038 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs); 13039 die->offset = offset; 13040 die->tag = abbrev->tag; 13041 die->abbrev = abbrev_number; 13042 13043 /* Make the result usable. 13044 The caller needs to update num_attrs after adding the extra 13045 attributes. */ 13046 die->num_attrs = abbrev->num_attrs; 13047 13048 for (i = 0; i < abbrev->num_attrs; ++i) 13049 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i], 13050 info_ptr); 13051 13052 *diep = die; 13053 *has_children = abbrev->has_children; 13054 return info_ptr; 13055 } 13056 13057 /* Read a die and all its attributes. 13058 Set DIEP to point to a newly allocated die with its information, 13059 except for its child, sibling, and parent fields. 13060 Set HAS_CHILDREN to tell whether the die has children or not. */ 13061 13062 static gdb_byte * 13063 read_full_die (const struct die_reader_specs *reader, 13064 struct die_info **diep, gdb_byte *info_ptr, 13065 int *has_children) 13066 { 13067 return read_full_die_1 (reader, diep, info_ptr, has_children, 0); 13068 } 13069 13070 /* Abbreviation tables. 13071 13072 In DWARF version 2, the description of the debugging information is 13073 stored in a separate .debug_abbrev section. Before we read any 13074 dies from a section we read in all abbreviations and install them 13075 in a hash table. */ 13076 13077 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */ 13078 13079 static struct abbrev_info * 13080 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table) 13081 { 13082 struct abbrev_info *abbrev; 13083 13084 abbrev = (struct abbrev_info *) 13085 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info)); 13086 memset (abbrev, 0, sizeof (struct abbrev_info)); 13087 return abbrev; 13088 } 13089 13090 /* Add an abbreviation to the table. */ 13091 13092 static void 13093 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table, 13094 unsigned int abbrev_number, 13095 struct abbrev_info *abbrev) 13096 { 13097 unsigned int hash_number; 13098 13099 hash_number = abbrev_number % ABBREV_HASH_SIZE; 13100 abbrev->next = abbrev_table->abbrevs[hash_number]; 13101 abbrev_table->abbrevs[hash_number] = abbrev; 13102 } 13103 13104 /* Look up an abbrev in the table. 13105 Returns NULL if the abbrev is not found. */ 13106 13107 static struct abbrev_info * 13108 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table, 13109 unsigned int abbrev_number) 13110 { 13111 unsigned int hash_number; 13112 struct abbrev_info *abbrev; 13113 13114 hash_number = abbrev_number % ABBREV_HASH_SIZE; 13115 abbrev = abbrev_table->abbrevs[hash_number]; 13116 13117 while (abbrev) 13118 { 13119 if (abbrev->number == abbrev_number) 13120 return abbrev; 13121 abbrev = abbrev->next; 13122 } 13123 return NULL; 13124 } 13125 13126 /* Read in an abbrev table. */ 13127 13128 static struct abbrev_table * 13129 abbrev_table_read_table (struct dwarf2_section_info *section, 13130 sect_offset offset) 13131 { 13132 struct objfile *objfile = dwarf2_per_objfile->objfile; 13133 bfd *abfd = section->asection->owner; 13134 struct abbrev_table *abbrev_table; 13135 gdb_byte *abbrev_ptr; 13136 struct abbrev_info *cur_abbrev; 13137 unsigned int abbrev_number, bytes_read, abbrev_name; 13138 unsigned int abbrev_form; 13139 struct attr_abbrev *cur_attrs; 13140 unsigned int allocated_attrs; 13141 13142 abbrev_table = XMALLOC (struct abbrev_table); 13143 abbrev_table->offset = offset; 13144 obstack_init (&abbrev_table->abbrev_obstack); 13145 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack, 13146 (ABBREV_HASH_SIZE 13147 * sizeof (struct abbrev_info *))); 13148 memset (abbrev_table->abbrevs, 0, 13149 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *)); 13150 13151 dwarf2_read_section (objfile, section); 13152 abbrev_ptr = section->buffer + offset.sect_off; 13153 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 13154 abbrev_ptr += bytes_read; 13155 13156 allocated_attrs = ATTR_ALLOC_CHUNK; 13157 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev)); 13158 13159 /* Loop until we reach an abbrev number of 0. */ 13160 while (abbrev_number) 13161 { 13162 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table); 13163 13164 /* read in abbrev header */ 13165 cur_abbrev->number = abbrev_number; 13166 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 13167 abbrev_ptr += bytes_read; 13168 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr); 13169 abbrev_ptr += 1; 13170 13171 /* now read in declarations */ 13172 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 13173 abbrev_ptr += bytes_read; 13174 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 13175 abbrev_ptr += bytes_read; 13176 while (abbrev_name) 13177 { 13178 if (cur_abbrev->num_attrs == allocated_attrs) 13179 { 13180 allocated_attrs += ATTR_ALLOC_CHUNK; 13181 cur_attrs 13182 = xrealloc (cur_attrs, (allocated_attrs 13183 * sizeof (struct attr_abbrev))); 13184 } 13185 13186 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name; 13187 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form; 13188 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 13189 abbrev_ptr += bytes_read; 13190 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 13191 abbrev_ptr += bytes_read; 13192 } 13193 13194 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack, 13195 (cur_abbrev->num_attrs 13196 * sizeof (struct attr_abbrev))); 13197 memcpy (cur_abbrev->attrs, cur_attrs, 13198 cur_abbrev->num_attrs * sizeof (struct attr_abbrev)); 13199 13200 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev); 13201 13202 /* Get next abbreviation. 13203 Under Irix6 the abbreviations for a compilation unit are not 13204 always properly terminated with an abbrev number of 0. 13205 Exit loop if we encounter an abbreviation which we have 13206 already read (which means we are about to read the abbreviations 13207 for the next compile unit) or if the end of the abbreviation 13208 table is reached. */ 13209 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size) 13210 break; 13211 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 13212 abbrev_ptr += bytes_read; 13213 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL) 13214 break; 13215 } 13216 13217 xfree (cur_attrs); 13218 return abbrev_table; 13219 } 13220 13221 /* Free the resources held by ABBREV_TABLE. */ 13222 13223 static void 13224 abbrev_table_free (struct abbrev_table *abbrev_table) 13225 { 13226 obstack_free (&abbrev_table->abbrev_obstack, NULL); 13227 xfree (abbrev_table); 13228 } 13229 13230 /* Same as abbrev_table_free but as a cleanup. 13231 We pass in a pointer to the pointer to the table so that we can 13232 set the pointer to NULL when we're done. It also simplifies 13233 build_type_unit_groups. */ 13234 13235 static void 13236 abbrev_table_free_cleanup (void *table_ptr) 13237 { 13238 struct abbrev_table **abbrev_table_ptr = table_ptr; 13239 13240 if (*abbrev_table_ptr != NULL) 13241 abbrev_table_free (*abbrev_table_ptr); 13242 *abbrev_table_ptr = NULL; 13243 } 13244 13245 /* Read the abbrev table for CU from ABBREV_SECTION. */ 13246 13247 static void 13248 dwarf2_read_abbrevs (struct dwarf2_cu *cu, 13249 struct dwarf2_section_info *abbrev_section) 13250 { 13251 cu->abbrev_table = 13252 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset); 13253 } 13254 13255 /* Release the memory used by the abbrev table for a compilation unit. */ 13256 13257 static void 13258 dwarf2_free_abbrev_table (void *ptr_to_cu) 13259 { 13260 struct dwarf2_cu *cu = ptr_to_cu; 13261 13262 abbrev_table_free (cu->abbrev_table); 13263 /* Set this to NULL so that we SEGV if we try to read it later, 13264 and also because free_comp_unit verifies this is NULL. */ 13265 cu->abbrev_table = NULL; 13266 } 13267 13268 /* Returns nonzero if TAG represents a type that we might generate a partial 13269 symbol for. */ 13270 13271 static int 13272 is_type_tag_for_partial (int tag) 13273 { 13274 switch (tag) 13275 { 13276 #if 0 13277 /* Some types that would be reasonable to generate partial symbols for, 13278 that we don't at present. */ 13279 case DW_TAG_array_type: 13280 case DW_TAG_file_type: 13281 case DW_TAG_ptr_to_member_type: 13282 case DW_TAG_set_type: 13283 case DW_TAG_string_type: 13284 case DW_TAG_subroutine_type: 13285 #endif 13286 case DW_TAG_base_type: 13287 case DW_TAG_class_type: 13288 case DW_TAG_interface_type: 13289 case DW_TAG_enumeration_type: 13290 case DW_TAG_structure_type: 13291 case DW_TAG_subrange_type: 13292 case DW_TAG_typedef: 13293 case DW_TAG_union_type: 13294 return 1; 13295 default: 13296 return 0; 13297 } 13298 } 13299 13300 /* Load all DIEs that are interesting for partial symbols into memory. */ 13301 13302 static struct partial_die_info * 13303 load_partial_dies (const struct die_reader_specs *reader, 13304 gdb_byte *info_ptr, int building_psymtab) 13305 { 13306 struct dwarf2_cu *cu = reader->cu; 13307 struct objfile *objfile = cu->objfile; 13308 struct partial_die_info *part_die; 13309 struct partial_die_info *parent_die, *last_die, *first_die = NULL; 13310 struct abbrev_info *abbrev; 13311 unsigned int bytes_read; 13312 unsigned int load_all = 0; 13313 int nesting_level = 1; 13314 13315 parent_die = NULL; 13316 last_die = NULL; 13317 13318 gdb_assert (cu->per_cu != NULL); 13319 if (cu->per_cu->load_all_dies) 13320 load_all = 1; 13321 13322 cu->partial_dies 13323 = htab_create_alloc_ex (cu->header.length / 12, 13324 partial_die_hash, 13325 partial_die_eq, 13326 NULL, 13327 &cu->comp_unit_obstack, 13328 hashtab_obstack_allocate, 13329 dummy_obstack_deallocate); 13330 13331 part_die = obstack_alloc (&cu->comp_unit_obstack, 13332 sizeof (struct partial_die_info)); 13333 13334 while (1) 13335 { 13336 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu); 13337 13338 /* A NULL abbrev means the end of a series of children. */ 13339 if (abbrev == NULL) 13340 { 13341 if (--nesting_level == 0) 13342 { 13343 /* PART_DIE was probably the last thing allocated on the 13344 comp_unit_obstack, so we could call obstack_free 13345 here. We don't do that because the waste is small, 13346 and will be cleaned up when we're done with this 13347 compilation unit. This way, we're also more robust 13348 against other users of the comp_unit_obstack. */ 13349 return first_die; 13350 } 13351 info_ptr += bytes_read; 13352 last_die = parent_die; 13353 parent_die = parent_die->die_parent; 13354 continue; 13355 } 13356 13357 /* Check for template arguments. We never save these; if 13358 they're seen, we just mark the parent, and go on our way. */ 13359 if (parent_die != NULL 13360 && cu->language == language_cplus 13361 && (abbrev->tag == DW_TAG_template_type_param 13362 || abbrev->tag == DW_TAG_template_value_param)) 13363 { 13364 parent_die->has_template_arguments = 1; 13365 13366 if (!load_all) 13367 { 13368 /* We don't need a partial DIE for the template argument. */ 13369 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); 13370 continue; 13371 } 13372 } 13373 13374 /* We only recurse into c++ subprograms looking for template arguments. 13375 Skip their other children. */ 13376 if (!load_all 13377 && cu->language == language_cplus 13378 && parent_die != NULL 13379 && parent_die->tag == DW_TAG_subprogram) 13380 { 13381 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); 13382 continue; 13383 } 13384 13385 /* Check whether this DIE is interesting enough to save. Normally 13386 we would not be interested in members here, but there may be 13387 later variables referencing them via DW_AT_specification (for 13388 static members). */ 13389 if (!load_all 13390 && !is_type_tag_for_partial (abbrev->tag) 13391 && abbrev->tag != DW_TAG_constant 13392 && abbrev->tag != DW_TAG_enumerator 13393 && abbrev->tag != DW_TAG_subprogram 13394 && abbrev->tag != DW_TAG_lexical_block 13395 && abbrev->tag != DW_TAG_variable 13396 && abbrev->tag != DW_TAG_namespace 13397 && abbrev->tag != DW_TAG_module 13398 && abbrev->tag != DW_TAG_member 13399 && abbrev->tag != DW_TAG_imported_unit) 13400 { 13401 /* Otherwise we skip to the next sibling, if any. */ 13402 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); 13403 continue; 13404 } 13405 13406 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read, 13407 info_ptr); 13408 13409 /* This two-pass algorithm for processing partial symbols has a 13410 high cost in cache pressure. Thus, handle some simple cases 13411 here which cover the majority of C partial symbols. DIEs 13412 which neither have specification tags in them, nor could have 13413 specification tags elsewhere pointing at them, can simply be 13414 processed and discarded. 13415 13416 This segment is also optional; scan_partial_symbols and 13417 add_partial_symbol will handle these DIEs if we chain 13418 them in normally. When compilers which do not emit large 13419 quantities of duplicate debug information are more common, 13420 this code can probably be removed. */ 13421 13422 /* Any complete simple types at the top level (pretty much all 13423 of them, for a language without namespaces), can be processed 13424 directly. */ 13425 if (parent_die == NULL 13426 && part_die->has_specification == 0 13427 && part_die->is_declaration == 0 13428 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children) 13429 || part_die->tag == DW_TAG_base_type 13430 || part_die->tag == DW_TAG_subrange_type)) 13431 { 13432 if (building_psymtab && part_die->name != NULL) 13433 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0, 13434 VAR_DOMAIN, LOC_TYPEDEF, 13435 &objfile->static_psymbols, 13436 0, (CORE_ADDR) 0, cu->language, objfile); 13437 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr); 13438 continue; 13439 } 13440 13441 /* The exception for DW_TAG_typedef with has_children above is 13442 a workaround of GCC PR debug/47510. In the case of this complaint 13443 type_name_no_tag_or_error will error on such types later. 13444 13445 GDB skipped children of DW_TAG_typedef by the shortcut above and then 13446 it could not find the child DIEs referenced later, this is checked 13447 above. In correct DWARF DW_TAG_typedef should have no children. */ 13448 13449 if (part_die->tag == DW_TAG_typedef && part_die->has_children) 13450 complaint (&symfile_complaints, 13451 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug " 13452 "- DIE at 0x%x [in module %s]"), 13453 part_die->offset.sect_off, objfile->name); 13454 13455 /* If we're at the second level, and we're an enumerator, and 13456 our parent has no specification (meaning possibly lives in a 13457 namespace elsewhere), then we can add the partial symbol now 13458 instead of queueing it. */ 13459 if (part_die->tag == DW_TAG_enumerator 13460 && parent_die != NULL 13461 && parent_die->die_parent == NULL 13462 && parent_die->tag == DW_TAG_enumeration_type 13463 && parent_die->has_specification == 0) 13464 { 13465 if (part_die->name == NULL) 13466 complaint (&symfile_complaints, 13467 _("malformed enumerator DIE ignored")); 13468 else if (building_psymtab) 13469 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0, 13470 VAR_DOMAIN, LOC_CONST, 13471 (cu->language == language_cplus 13472 || cu->language == language_java) 13473 ? &objfile->global_psymbols 13474 : &objfile->static_psymbols, 13475 0, (CORE_ADDR) 0, cu->language, objfile); 13476 13477 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr); 13478 continue; 13479 } 13480 13481 /* We'll save this DIE so link it in. */ 13482 part_die->die_parent = parent_die; 13483 part_die->die_sibling = NULL; 13484 part_die->die_child = NULL; 13485 13486 if (last_die && last_die == parent_die) 13487 last_die->die_child = part_die; 13488 else if (last_die) 13489 last_die->die_sibling = part_die; 13490 13491 last_die = part_die; 13492 13493 if (first_die == NULL) 13494 first_die = part_die; 13495 13496 /* Maybe add the DIE to the hash table. Not all DIEs that we 13497 find interesting need to be in the hash table, because we 13498 also have the parent/sibling/child chains; only those that we 13499 might refer to by offset later during partial symbol reading. 13500 13501 For now this means things that might have be the target of a 13502 DW_AT_specification, DW_AT_abstract_origin, or 13503 DW_AT_extension. DW_AT_extension will refer only to 13504 namespaces; DW_AT_abstract_origin refers to functions (and 13505 many things under the function DIE, but we do not recurse 13506 into function DIEs during partial symbol reading) and 13507 possibly variables as well; DW_AT_specification refers to 13508 declarations. Declarations ought to have the DW_AT_declaration 13509 flag. It happens that GCC forgets to put it in sometimes, but 13510 only for functions, not for types. 13511 13512 Adding more things than necessary to the hash table is harmless 13513 except for the performance cost. Adding too few will result in 13514 wasted time in find_partial_die, when we reread the compilation 13515 unit with load_all_dies set. */ 13516 13517 if (load_all 13518 || abbrev->tag == DW_TAG_constant 13519 || abbrev->tag == DW_TAG_subprogram 13520 || abbrev->tag == DW_TAG_variable 13521 || abbrev->tag == DW_TAG_namespace 13522 || part_die->is_declaration) 13523 { 13524 void **slot; 13525 13526 slot = htab_find_slot_with_hash (cu->partial_dies, part_die, 13527 part_die->offset.sect_off, INSERT); 13528 *slot = part_die; 13529 } 13530 13531 part_die = obstack_alloc (&cu->comp_unit_obstack, 13532 sizeof (struct partial_die_info)); 13533 13534 /* For some DIEs we want to follow their children (if any). For C 13535 we have no reason to follow the children of structures; for other 13536 languages we have to, so that we can get at method physnames 13537 to infer fully qualified class names, for DW_AT_specification, 13538 and for C++ template arguments. For C++, we also look one level 13539 inside functions to find template arguments (if the name of the 13540 function does not already contain the template arguments). 13541 13542 For Ada, we need to scan the children of subprograms and lexical 13543 blocks as well because Ada allows the definition of nested 13544 entities that could be interesting for the debugger, such as 13545 nested subprograms for instance. */ 13546 if (last_die->has_children 13547 && (load_all 13548 || last_die->tag == DW_TAG_namespace 13549 || last_die->tag == DW_TAG_module 13550 || last_die->tag == DW_TAG_enumeration_type 13551 || (cu->language == language_cplus 13552 && last_die->tag == DW_TAG_subprogram 13553 && (last_die->name == NULL 13554 || strchr (last_die->name, '<') == NULL)) 13555 || (cu->language != language_c 13556 && (last_die->tag == DW_TAG_class_type 13557 || last_die->tag == DW_TAG_interface_type 13558 || last_die->tag == DW_TAG_structure_type 13559 || last_die->tag == DW_TAG_union_type)) 13560 || (cu->language == language_ada 13561 && (last_die->tag == DW_TAG_subprogram 13562 || last_die->tag == DW_TAG_lexical_block)))) 13563 { 13564 nesting_level++; 13565 parent_die = last_die; 13566 continue; 13567 } 13568 13569 /* Otherwise we skip to the next sibling, if any. */ 13570 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr); 13571 13572 /* Back to the top, do it again. */ 13573 } 13574 } 13575 13576 /* Read a minimal amount of information into the minimal die structure. */ 13577 13578 static gdb_byte * 13579 read_partial_die (const struct die_reader_specs *reader, 13580 struct partial_die_info *part_die, 13581 struct abbrev_info *abbrev, unsigned int abbrev_len, 13582 gdb_byte *info_ptr) 13583 { 13584 struct dwarf2_cu *cu = reader->cu; 13585 struct objfile *objfile = cu->objfile; 13586 gdb_byte *buffer = reader->buffer; 13587 unsigned int i; 13588 struct attribute attr; 13589 int has_low_pc_attr = 0; 13590 int has_high_pc_attr = 0; 13591 int high_pc_relative = 0; 13592 13593 memset (part_die, 0, sizeof (struct partial_die_info)); 13594 13595 part_die->offset.sect_off = info_ptr - buffer; 13596 13597 info_ptr += abbrev_len; 13598 13599 if (abbrev == NULL) 13600 return info_ptr; 13601 13602 part_die->tag = abbrev->tag; 13603 part_die->has_children = abbrev->has_children; 13604 13605 for (i = 0; i < abbrev->num_attrs; ++i) 13606 { 13607 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr); 13608 13609 /* Store the data if it is of an attribute we want to keep in a 13610 partial symbol table. */ 13611 switch (attr.name) 13612 { 13613 case DW_AT_name: 13614 switch (part_die->tag) 13615 { 13616 case DW_TAG_compile_unit: 13617 case DW_TAG_partial_unit: 13618 case DW_TAG_type_unit: 13619 /* Compilation units have a DW_AT_name that is a filename, not 13620 a source language identifier. */ 13621 case DW_TAG_enumeration_type: 13622 case DW_TAG_enumerator: 13623 /* These tags always have simple identifiers already; no need 13624 to canonicalize them. */ 13625 part_die->name = DW_STRING (&attr); 13626 break; 13627 default: 13628 part_die->name 13629 = dwarf2_canonicalize_name (DW_STRING (&attr), cu, 13630 &objfile->objfile_obstack); 13631 break; 13632 } 13633 break; 13634 case DW_AT_linkage_name: 13635 case DW_AT_MIPS_linkage_name: 13636 /* Note that both forms of linkage name might appear. We 13637 assume they will be the same, and we only store the last 13638 one we see. */ 13639 if (cu->language == language_ada) 13640 part_die->name = DW_STRING (&attr); 13641 part_die->linkage_name = DW_STRING (&attr); 13642 break; 13643 case DW_AT_low_pc: 13644 has_low_pc_attr = 1; 13645 part_die->lowpc = DW_ADDR (&attr); 13646 break; 13647 case DW_AT_high_pc: 13648 has_high_pc_attr = 1; 13649 if (attr.form == DW_FORM_addr 13650 || attr.form == DW_FORM_GNU_addr_index) 13651 part_die->highpc = DW_ADDR (&attr); 13652 else 13653 { 13654 high_pc_relative = 1; 13655 part_die->highpc = DW_UNSND (&attr); 13656 } 13657 break; 13658 case DW_AT_location: 13659 /* Support the .debug_loc offsets. */ 13660 if (attr_form_is_block (&attr)) 13661 { 13662 part_die->d.locdesc = DW_BLOCK (&attr); 13663 } 13664 else if (attr_form_is_section_offset (&attr)) 13665 { 13666 dwarf2_complex_location_expr_complaint (); 13667 } 13668 else 13669 { 13670 dwarf2_invalid_attrib_class_complaint ("DW_AT_location", 13671 "partial symbol information"); 13672 } 13673 break; 13674 case DW_AT_external: 13675 part_die->is_external = DW_UNSND (&attr); 13676 break; 13677 case DW_AT_declaration: 13678 part_die->is_declaration = DW_UNSND (&attr); 13679 break; 13680 case DW_AT_type: 13681 part_die->has_type = 1; 13682 break; 13683 case DW_AT_abstract_origin: 13684 case DW_AT_specification: 13685 case DW_AT_extension: 13686 part_die->has_specification = 1; 13687 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr); 13688 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt 13689 || cu->per_cu->is_dwz); 13690 break; 13691 case DW_AT_sibling: 13692 /* Ignore absolute siblings, they might point outside of 13693 the current compile unit. */ 13694 if (attr.form == DW_FORM_ref_addr) 13695 complaint (&symfile_complaints, 13696 _("ignoring absolute DW_AT_sibling")); 13697 else 13698 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr).sect_off; 13699 break; 13700 case DW_AT_byte_size: 13701 part_die->has_byte_size = 1; 13702 break; 13703 case DW_AT_calling_convention: 13704 /* DWARF doesn't provide a way to identify a program's source-level 13705 entry point. DW_AT_calling_convention attributes are only meant 13706 to describe functions' calling conventions. 13707 13708 However, because it's a necessary piece of information in 13709 Fortran, and because DW_CC_program is the only piece of debugging 13710 information whose definition refers to a 'main program' at all, 13711 several compilers have begun marking Fortran main programs with 13712 DW_CC_program --- even when those functions use the standard 13713 calling conventions. 13714 13715 So until DWARF specifies a way to provide this information and 13716 compilers pick up the new representation, we'll support this 13717 practice. */ 13718 if (DW_UNSND (&attr) == DW_CC_program 13719 && cu->language == language_fortran) 13720 { 13721 set_main_name (part_die->name); 13722 13723 /* As this DIE has a static linkage the name would be difficult 13724 to look up later. */ 13725 language_of_main = language_fortran; 13726 } 13727 break; 13728 case DW_AT_inline: 13729 if (DW_UNSND (&attr) == DW_INL_inlined 13730 || DW_UNSND (&attr) == DW_INL_declared_inlined) 13731 part_die->may_be_inlined = 1; 13732 break; 13733 13734 case DW_AT_import: 13735 if (part_die->tag == DW_TAG_imported_unit) 13736 { 13737 part_die->d.offset = dwarf2_get_ref_die_offset (&attr); 13738 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt 13739 || cu->per_cu->is_dwz); 13740 } 13741 break; 13742 13743 default: 13744 break; 13745 } 13746 } 13747 13748 if (high_pc_relative) 13749 part_die->highpc += part_die->lowpc; 13750 13751 if (has_low_pc_attr && has_high_pc_attr) 13752 { 13753 /* When using the GNU linker, .gnu.linkonce. sections are used to 13754 eliminate duplicate copies of functions and vtables and such. 13755 The linker will arbitrarily choose one and discard the others. 13756 The AT_*_pc values for such functions refer to local labels in 13757 these sections. If the section from that file was discarded, the 13758 labels are not in the output, so the relocs get a value of 0. 13759 If this is a discarded function, mark the pc bounds as invalid, 13760 so that GDB will ignore it. */ 13761 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero) 13762 { 13763 struct gdbarch *gdbarch = get_objfile_arch (objfile); 13764 13765 complaint (&symfile_complaints, 13766 _("DW_AT_low_pc %s is zero " 13767 "for DIE at 0x%x [in module %s]"), 13768 paddress (gdbarch, part_die->lowpc), 13769 part_die->offset.sect_off, objfile->name); 13770 } 13771 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */ 13772 else if (part_die->lowpc >= part_die->highpc) 13773 { 13774 struct gdbarch *gdbarch = get_objfile_arch (objfile); 13775 13776 complaint (&symfile_complaints, 13777 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s " 13778 "for DIE at 0x%x [in module %s]"), 13779 paddress (gdbarch, part_die->lowpc), 13780 paddress (gdbarch, part_die->highpc), 13781 part_die->offset.sect_off, objfile->name); 13782 } 13783 else 13784 part_die->has_pc_info = 1; 13785 } 13786 13787 return info_ptr; 13788 } 13789 13790 /* Find a cached partial DIE at OFFSET in CU. */ 13791 13792 static struct partial_die_info * 13793 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu) 13794 { 13795 struct partial_die_info *lookup_die = NULL; 13796 struct partial_die_info part_die; 13797 13798 part_die.offset = offset; 13799 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die, 13800 offset.sect_off); 13801 13802 return lookup_die; 13803 } 13804 13805 /* Find a partial DIE at OFFSET, which may or may not be in CU, 13806 except in the case of .debug_types DIEs which do not reference 13807 outside their CU (they do however referencing other types via 13808 DW_FORM_ref_sig8). */ 13809 13810 static struct partial_die_info * 13811 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu) 13812 { 13813 struct objfile *objfile = cu->objfile; 13814 struct dwarf2_per_cu_data *per_cu = NULL; 13815 struct partial_die_info *pd = NULL; 13816 13817 if (offset_in_dwz == cu->per_cu->is_dwz 13818 && offset_in_cu_p (&cu->header, offset)) 13819 { 13820 pd = find_partial_die_in_comp_unit (offset, cu); 13821 if (pd != NULL) 13822 return pd; 13823 /* We missed recording what we needed. 13824 Load all dies and try again. */ 13825 per_cu = cu->per_cu; 13826 } 13827 else 13828 { 13829 /* TUs don't reference other CUs/TUs (except via type signatures). */ 13830 if (cu->per_cu->is_debug_types) 13831 { 13832 error (_("Dwarf Error: Type Unit at offset 0x%lx contains" 13833 " external reference to offset 0x%lx [in module %s].\n"), 13834 (long) cu->header.offset.sect_off, (long) offset.sect_off, 13835 bfd_get_filename (objfile->obfd)); 13836 } 13837 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz, 13838 objfile); 13839 13840 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL) 13841 load_partial_comp_unit (per_cu); 13842 13843 per_cu->cu->last_used = 0; 13844 pd = find_partial_die_in_comp_unit (offset, per_cu->cu); 13845 } 13846 13847 /* If we didn't find it, and not all dies have been loaded, 13848 load them all and try again. */ 13849 13850 if (pd == NULL && per_cu->load_all_dies == 0) 13851 { 13852 per_cu->load_all_dies = 1; 13853 13854 /* This is nasty. When we reread the DIEs, somewhere up the call chain 13855 THIS_CU->cu may already be in use. So we can't just free it and 13856 replace its DIEs with the ones we read in. Instead, we leave those 13857 DIEs alone (which can still be in use, e.g. in scan_partial_symbols), 13858 and clobber THIS_CU->cu->partial_dies with the hash table for the new 13859 set. */ 13860 load_partial_comp_unit (per_cu); 13861 13862 pd = find_partial_die_in_comp_unit (offset, per_cu->cu); 13863 } 13864 13865 if (pd == NULL) 13866 internal_error (__FILE__, __LINE__, 13867 _("could not find partial DIE 0x%x " 13868 "in cache [from module %s]\n"), 13869 offset.sect_off, bfd_get_filename (objfile->obfd)); 13870 return pd; 13871 } 13872 13873 /* See if we can figure out if the class lives in a namespace. We do 13874 this by looking for a member function; its demangled name will 13875 contain namespace info, if there is any. */ 13876 13877 static void 13878 guess_partial_die_structure_name (struct partial_die_info *struct_pdi, 13879 struct dwarf2_cu *cu) 13880 { 13881 /* NOTE: carlton/2003-10-07: Getting the info this way changes 13882 what template types look like, because the demangler 13883 frequently doesn't give the same name as the debug info. We 13884 could fix this by only using the demangled name to get the 13885 prefix (but see comment in read_structure_type). */ 13886 13887 struct partial_die_info *real_pdi; 13888 struct partial_die_info *child_pdi; 13889 13890 /* If this DIE (this DIE's specification, if any) has a parent, then 13891 we should not do this. We'll prepend the parent's fully qualified 13892 name when we create the partial symbol. */ 13893 13894 real_pdi = struct_pdi; 13895 while (real_pdi->has_specification) 13896 real_pdi = find_partial_die (real_pdi->spec_offset, 13897 real_pdi->spec_is_dwz, cu); 13898 13899 if (real_pdi->die_parent != NULL) 13900 return; 13901 13902 for (child_pdi = struct_pdi->die_child; 13903 child_pdi != NULL; 13904 child_pdi = child_pdi->die_sibling) 13905 { 13906 if (child_pdi->tag == DW_TAG_subprogram 13907 && child_pdi->linkage_name != NULL) 13908 { 13909 char *actual_class_name 13910 = language_class_name_from_physname (cu->language_defn, 13911 child_pdi->linkage_name); 13912 if (actual_class_name != NULL) 13913 { 13914 struct_pdi->name 13915 = obstack_copy0 (&cu->objfile->objfile_obstack, 13916 actual_class_name, 13917 strlen (actual_class_name)); 13918 xfree (actual_class_name); 13919 } 13920 break; 13921 } 13922 } 13923 } 13924 13925 /* Adjust PART_DIE before generating a symbol for it. This function 13926 may set the is_external flag or change the DIE's name. */ 13927 13928 static void 13929 fixup_partial_die (struct partial_die_info *part_die, 13930 struct dwarf2_cu *cu) 13931 { 13932 /* Once we've fixed up a die, there's no point in doing so again. 13933 This also avoids a memory leak if we were to call 13934 guess_partial_die_structure_name multiple times. */ 13935 if (part_die->fixup_called) 13936 return; 13937 13938 /* If we found a reference attribute and the DIE has no name, try 13939 to find a name in the referred to DIE. */ 13940 13941 if (part_die->name == NULL && part_die->has_specification) 13942 { 13943 struct partial_die_info *spec_die; 13944 13945 spec_die = find_partial_die (part_die->spec_offset, 13946 part_die->spec_is_dwz, cu); 13947 13948 fixup_partial_die (spec_die, cu); 13949 13950 if (spec_die->name) 13951 { 13952 part_die->name = spec_die->name; 13953 13954 /* Copy DW_AT_external attribute if it is set. */ 13955 if (spec_die->is_external) 13956 part_die->is_external = spec_die->is_external; 13957 } 13958 } 13959 13960 /* Set default names for some unnamed DIEs. */ 13961 13962 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace) 13963 part_die->name = CP_ANONYMOUS_NAMESPACE_STR; 13964 13965 /* If there is no parent die to provide a namespace, and there are 13966 children, see if we can determine the namespace from their linkage 13967 name. */ 13968 if (cu->language == language_cplus 13969 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types) 13970 && part_die->die_parent == NULL 13971 && part_die->has_children 13972 && (part_die->tag == DW_TAG_class_type 13973 || part_die->tag == DW_TAG_structure_type 13974 || part_die->tag == DW_TAG_union_type)) 13975 guess_partial_die_structure_name (part_die, cu); 13976 13977 /* GCC might emit a nameless struct or union that has a linkage 13978 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ 13979 if (part_die->name == NULL 13980 && (part_die->tag == DW_TAG_class_type 13981 || part_die->tag == DW_TAG_interface_type 13982 || part_die->tag == DW_TAG_structure_type 13983 || part_die->tag == DW_TAG_union_type) 13984 && part_die->linkage_name != NULL) 13985 { 13986 char *demangled; 13987 13988 demangled = cplus_demangle (part_die->linkage_name, DMGL_TYPES); 13989 if (demangled) 13990 { 13991 const char *base; 13992 13993 /* Strip any leading namespaces/classes, keep only the base name. 13994 DW_AT_name for named DIEs does not contain the prefixes. */ 13995 base = strrchr (demangled, ':'); 13996 if (base && base > demangled && base[-1] == ':') 13997 base++; 13998 else 13999 base = demangled; 14000 14001 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack, 14002 base, strlen (base)); 14003 xfree (demangled); 14004 } 14005 } 14006 14007 part_die->fixup_called = 1; 14008 } 14009 14010 /* Read an attribute value described by an attribute form. */ 14011 14012 static gdb_byte * 14013 read_attribute_value (const struct die_reader_specs *reader, 14014 struct attribute *attr, unsigned form, 14015 gdb_byte *info_ptr) 14016 { 14017 struct dwarf2_cu *cu = reader->cu; 14018 bfd *abfd = reader->abfd; 14019 struct comp_unit_head *cu_header = &cu->header; 14020 unsigned int bytes_read; 14021 struct dwarf_block *blk; 14022 14023 attr->form = form; 14024 switch (form) 14025 { 14026 case DW_FORM_ref_addr: 14027 if (cu->header.version == 2) 14028 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read); 14029 else 14030 DW_UNSND (attr) = read_offset (abfd, info_ptr, 14031 &cu->header, &bytes_read); 14032 info_ptr += bytes_read; 14033 break; 14034 case DW_FORM_GNU_ref_alt: 14035 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read); 14036 info_ptr += bytes_read; 14037 break; 14038 case DW_FORM_addr: 14039 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read); 14040 info_ptr += bytes_read; 14041 break; 14042 case DW_FORM_block2: 14043 blk = dwarf_alloc_block (cu); 14044 blk->size = read_2_bytes (abfd, info_ptr); 14045 info_ptr += 2; 14046 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 14047 info_ptr += blk->size; 14048 DW_BLOCK (attr) = blk; 14049 break; 14050 case DW_FORM_block4: 14051 blk = dwarf_alloc_block (cu); 14052 blk->size = read_4_bytes (abfd, info_ptr); 14053 info_ptr += 4; 14054 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 14055 info_ptr += blk->size; 14056 DW_BLOCK (attr) = blk; 14057 break; 14058 case DW_FORM_data2: 14059 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr); 14060 info_ptr += 2; 14061 break; 14062 case DW_FORM_data4: 14063 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr); 14064 info_ptr += 4; 14065 break; 14066 case DW_FORM_data8: 14067 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr); 14068 info_ptr += 8; 14069 break; 14070 case DW_FORM_sec_offset: 14071 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read); 14072 info_ptr += bytes_read; 14073 break; 14074 case DW_FORM_string: 14075 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read); 14076 DW_STRING_IS_CANONICAL (attr) = 0; 14077 info_ptr += bytes_read; 14078 break; 14079 case DW_FORM_strp: 14080 if (!cu->per_cu->is_dwz) 14081 { 14082 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header, 14083 &bytes_read); 14084 DW_STRING_IS_CANONICAL (attr) = 0; 14085 info_ptr += bytes_read; 14086 break; 14087 } 14088 /* FALLTHROUGH */ 14089 case DW_FORM_GNU_strp_alt: 14090 { 14091 struct dwz_file *dwz = dwarf2_get_dwz_file (); 14092 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header, 14093 &bytes_read); 14094 14095 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset); 14096 DW_STRING_IS_CANONICAL (attr) = 0; 14097 info_ptr += bytes_read; 14098 } 14099 break; 14100 case DW_FORM_exprloc: 14101 case DW_FORM_block: 14102 blk = dwarf_alloc_block (cu); 14103 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 14104 info_ptr += bytes_read; 14105 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 14106 info_ptr += blk->size; 14107 DW_BLOCK (attr) = blk; 14108 break; 14109 case DW_FORM_block1: 14110 blk = dwarf_alloc_block (cu); 14111 blk->size = read_1_byte (abfd, info_ptr); 14112 info_ptr += 1; 14113 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 14114 info_ptr += blk->size; 14115 DW_BLOCK (attr) = blk; 14116 break; 14117 case DW_FORM_data1: 14118 DW_UNSND (attr) = read_1_byte (abfd, info_ptr); 14119 info_ptr += 1; 14120 break; 14121 case DW_FORM_flag: 14122 DW_UNSND (attr) = read_1_byte (abfd, info_ptr); 14123 info_ptr += 1; 14124 break; 14125 case DW_FORM_flag_present: 14126 DW_UNSND (attr) = 1; 14127 break; 14128 case DW_FORM_sdata: 14129 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read); 14130 info_ptr += bytes_read; 14131 break; 14132 case DW_FORM_udata: 14133 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 14134 info_ptr += bytes_read; 14135 break; 14136 case DW_FORM_ref1: 14137 DW_UNSND (attr) = (cu->header.offset.sect_off 14138 + read_1_byte (abfd, info_ptr)); 14139 info_ptr += 1; 14140 break; 14141 case DW_FORM_ref2: 14142 DW_UNSND (attr) = (cu->header.offset.sect_off 14143 + read_2_bytes (abfd, info_ptr)); 14144 info_ptr += 2; 14145 break; 14146 case DW_FORM_ref4: 14147 DW_UNSND (attr) = (cu->header.offset.sect_off 14148 + read_4_bytes (abfd, info_ptr)); 14149 info_ptr += 4; 14150 break; 14151 case DW_FORM_ref8: 14152 DW_UNSND (attr) = (cu->header.offset.sect_off 14153 + read_8_bytes (abfd, info_ptr)); 14154 info_ptr += 8; 14155 break; 14156 case DW_FORM_ref_sig8: 14157 /* Convert the signature to something we can record in DW_UNSND 14158 for later lookup. 14159 NOTE: This is NULL if the type wasn't found. */ 14160 DW_SIGNATURED_TYPE (attr) = 14161 lookup_signatured_type (read_8_bytes (abfd, info_ptr)); 14162 info_ptr += 8; 14163 break; 14164 case DW_FORM_ref_udata: 14165 DW_UNSND (attr) = (cu->header.offset.sect_off 14166 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read)); 14167 info_ptr += bytes_read; 14168 break; 14169 case DW_FORM_indirect: 14170 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 14171 info_ptr += bytes_read; 14172 info_ptr = read_attribute_value (reader, attr, form, info_ptr); 14173 break; 14174 case DW_FORM_GNU_addr_index: 14175 if (reader->dwo_file == NULL) 14176 { 14177 /* For now flag a hard error. 14178 Later we can turn this into a complaint. */ 14179 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"), 14180 dwarf_form_name (form), 14181 bfd_get_filename (abfd)); 14182 } 14183 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read); 14184 info_ptr += bytes_read; 14185 break; 14186 case DW_FORM_GNU_str_index: 14187 if (reader->dwo_file == NULL) 14188 { 14189 /* For now flag a hard error. 14190 Later we can turn this into a complaint if warranted. */ 14191 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"), 14192 dwarf_form_name (form), 14193 bfd_get_filename (abfd)); 14194 } 14195 { 14196 ULONGEST str_index = 14197 read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 14198 14199 DW_STRING (attr) = read_str_index (reader, cu, str_index); 14200 DW_STRING_IS_CANONICAL (attr) = 0; 14201 info_ptr += bytes_read; 14202 } 14203 break; 14204 default: 14205 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"), 14206 dwarf_form_name (form), 14207 bfd_get_filename (abfd)); 14208 } 14209 14210 /* Super hack. */ 14211 if (cu->per_cu->is_dwz && is_ref_attr (attr)) 14212 attr->form = DW_FORM_GNU_ref_alt; 14213 14214 /* We have seen instances where the compiler tried to emit a byte 14215 size attribute of -1 which ended up being encoded as an unsigned 14216 0xffffffff. Although 0xffffffff is technically a valid size value, 14217 an object of this size seems pretty unlikely so we can relatively 14218 safely treat these cases as if the size attribute was invalid and 14219 treat them as zero by default. */ 14220 if (attr->name == DW_AT_byte_size 14221 && form == DW_FORM_data4 14222 && DW_UNSND (attr) >= 0xffffffff) 14223 { 14224 complaint 14225 (&symfile_complaints, 14226 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"), 14227 hex_string (DW_UNSND (attr))); 14228 DW_UNSND (attr) = 0; 14229 } 14230 14231 return info_ptr; 14232 } 14233 14234 /* Read an attribute described by an abbreviated attribute. */ 14235 14236 static gdb_byte * 14237 read_attribute (const struct die_reader_specs *reader, 14238 struct attribute *attr, struct attr_abbrev *abbrev, 14239 gdb_byte *info_ptr) 14240 { 14241 attr->name = abbrev->name; 14242 return read_attribute_value (reader, attr, abbrev->form, info_ptr); 14243 } 14244 14245 /* Read dwarf information from a buffer. */ 14246 14247 static unsigned int 14248 read_1_byte (bfd *abfd, const gdb_byte *buf) 14249 { 14250 return bfd_get_8 (abfd, buf); 14251 } 14252 14253 static int 14254 read_1_signed_byte (bfd *abfd, const gdb_byte *buf) 14255 { 14256 return bfd_get_signed_8 (abfd, buf); 14257 } 14258 14259 static unsigned int 14260 read_2_bytes (bfd *abfd, const gdb_byte *buf) 14261 { 14262 return bfd_get_16 (abfd, buf); 14263 } 14264 14265 static int 14266 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf) 14267 { 14268 return bfd_get_signed_16 (abfd, buf); 14269 } 14270 14271 static unsigned int 14272 read_4_bytes (bfd *abfd, const gdb_byte *buf) 14273 { 14274 return bfd_get_32 (abfd, buf); 14275 } 14276 14277 static int 14278 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf) 14279 { 14280 return bfd_get_signed_32 (abfd, buf); 14281 } 14282 14283 static ULONGEST 14284 read_8_bytes (bfd *abfd, const gdb_byte *buf) 14285 { 14286 return bfd_get_64 (abfd, buf); 14287 } 14288 14289 static CORE_ADDR 14290 read_address (bfd *abfd, gdb_byte *buf, struct dwarf2_cu *cu, 14291 unsigned int *bytes_read) 14292 { 14293 struct comp_unit_head *cu_header = &cu->header; 14294 CORE_ADDR retval = 0; 14295 14296 if (cu_header->signed_addr_p) 14297 { 14298 switch (cu_header->addr_size) 14299 { 14300 case 2: 14301 retval = bfd_get_signed_16 (abfd, buf); 14302 break; 14303 case 4: 14304 retval = bfd_get_signed_32 (abfd, buf); 14305 break; 14306 case 8: 14307 retval = bfd_get_signed_64 (abfd, buf); 14308 break; 14309 default: 14310 internal_error (__FILE__, __LINE__, 14311 _("read_address: bad switch, signed [in module %s]"), 14312 bfd_get_filename (abfd)); 14313 } 14314 } 14315 else 14316 { 14317 switch (cu_header->addr_size) 14318 { 14319 case 2: 14320 retval = bfd_get_16 (abfd, buf); 14321 break; 14322 case 4: 14323 retval = bfd_get_32 (abfd, buf); 14324 break; 14325 case 8: 14326 retval = bfd_get_64 (abfd, buf); 14327 break; 14328 default: 14329 internal_error (__FILE__, __LINE__, 14330 _("read_address: bad switch, " 14331 "unsigned [in module %s]"), 14332 bfd_get_filename (abfd)); 14333 } 14334 } 14335 14336 *bytes_read = cu_header->addr_size; 14337 return retval; 14338 } 14339 14340 /* Read the initial length from a section. The (draft) DWARF 3 14341 specification allows the initial length to take up either 4 bytes 14342 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8 14343 bytes describe the length and all offsets will be 8 bytes in length 14344 instead of 4. 14345 14346 An older, non-standard 64-bit format is also handled by this 14347 function. The older format in question stores the initial length 14348 as an 8-byte quantity without an escape value. Lengths greater 14349 than 2^32 aren't very common which means that the initial 4 bytes 14350 is almost always zero. Since a length value of zero doesn't make 14351 sense for the 32-bit format, this initial zero can be considered to 14352 be an escape value which indicates the presence of the older 64-bit 14353 format. As written, the code can't detect (old format) lengths 14354 greater than 4GB. If it becomes necessary to handle lengths 14355 somewhat larger than 4GB, we could allow other small values (such 14356 as the non-sensical values of 1, 2, and 3) to also be used as 14357 escape values indicating the presence of the old format. 14358 14359 The value returned via bytes_read should be used to increment the 14360 relevant pointer after calling read_initial_length(). 14361 14362 [ Note: read_initial_length() and read_offset() are based on the 14363 document entitled "DWARF Debugging Information Format", revision 14364 3, draft 8, dated November 19, 2001. This document was obtained 14365 from: 14366 14367 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf 14368 14369 This document is only a draft and is subject to change. (So beware.) 14370 14371 Details regarding the older, non-standard 64-bit format were 14372 determined empirically by examining 64-bit ELF files produced by 14373 the SGI toolchain on an IRIX 6.5 machine. 14374 14375 - Kevin, July 16, 2002 14376 ] */ 14377 14378 static LONGEST 14379 read_initial_length (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read) 14380 { 14381 LONGEST length = bfd_get_32 (abfd, buf); 14382 14383 if (length == 0xffffffff) 14384 { 14385 length = bfd_get_64 (abfd, buf + 4); 14386 *bytes_read = 12; 14387 } 14388 else if (length == 0) 14389 { 14390 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */ 14391 length = bfd_get_64 (abfd, buf); 14392 *bytes_read = 8; 14393 } 14394 else 14395 { 14396 *bytes_read = 4; 14397 } 14398 14399 return length; 14400 } 14401 14402 /* Cover function for read_initial_length. 14403 Returns the length of the object at BUF, and stores the size of the 14404 initial length in *BYTES_READ and stores the size that offsets will be in 14405 *OFFSET_SIZE. 14406 If the initial length size is not equivalent to that specified in 14407 CU_HEADER then issue a complaint. 14408 This is useful when reading non-comp-unit headers. */ 14409 14410 static LONGEST 14411 read_checked_initial_length_and_offset (bfd *abfd, gdb_byte *buf, 14412 const struct comp_unit_head *cu_header, 14413 unsigned int *bytes_read, 14414 unsigned int *offset_size) 14415 { 14416 LONGEST length = read_initial_length (abfd, buf, bytes_read); 14417 14418 gdb_assert (cu_header->initial_length_size == 4 14419 || cu_header->initial_length_size == 8 14420 || cu_header->initial_length_size == 12); 14421 14422 if (cu_header->initial_length_size != *bytes_read) 14423 complaint (&symfile_complaints, 14424 _("intermixed 32-bit and 64-bit DWARF sections")); 14425 14426 *offset_size = (*bytes_read == 4) ? 4 : 8; 14427 return length; 14428 } 14429 14430 /* Read an offset from the data stream. The size of the offset is 14431 given by cu_header->offset_size. */ 14432 14433 static LONGEST 14434 read_offset (bfd *abfd, gdb_byte *buf, const struct comp_unit_head *cu_header, 14435 unsigned int *bytes_read) 14436 { 14437 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size); 14438 14439 *bytes_read = cu_header->offset_size; 14440 return offset; 14441 } 14442 14443 /* Read an offset from the data stream. */ 14444 14445 static LONGEST 14446 read_offset_1 (bfd *abfd, gdb_byte *buf, unsigned int offset_size) 14447 { 14448 LONGEST retval = 0; 14449 14450 switch (offset_size) 14451 { 14452 case 4: 14453 retval = bfd_get_32 (abfd, buf); 14454 break; 14455 case 8: 14456 retval = bfd_get_64 (abfd, buf); 14457 break; 14458 default: 14459 internal_error (__FILE__, __LINE__, 14460 _("read_offset_1: bad switch [in module %s]"), 14461 bfd_get_filename (abfd)); 14462 } 14463 14464 return retval; 14465 } 14466 14467 static gdb_byte * 14468 read_n_bytes (bfd *abfd, gdb_byte *buf, unsigned int size) 14469 { 14470 /* If the size of a host char is 8 bits, we can return a pointer 14471 to the buffer, otherwise we have to copy the data to a buffer 14472 allocated on the temporary obstack. */ 14473 gdb_assert (HOST_CHAR_BIT == 8); 14474 return buf; 14475 } 14476 14477 static char * 14478 read_direct_string (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr) 14479 { 14480 /* If the size of a host char is 8 bits, we can return a pointer 14481 to the string, otherwise we have to copy the string to a buffer 14482 allocated on the temporary obstack. */ 14483 gdb_assert (HOST_CHAR_BIT == 8); 14484 if (*buf == '\0') 14485 { 14486 *bytes_read_ptr = 1; 14487 return NULL; 14488 } 14489 *bytes_read_ptr = strlen ((char *) buf) + 1; 14490 return (char *) buf; 14491 } 14492 14493 static char * 14494 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset) 14495 { 14496 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str); 14497 if (dwarf2_per_objfile->str.buffer == NULL) 14498 error (_("DW_FORM_strp used without .debug_str section [in module %s]"), 14499 bfd_get_filename (abfd)); 14500 if (str_offset >= dwarf2_per_objfile->str.size) 14501 error (_("DW_FORM_strp pointing outside of " 14502 ".debug_str section [in module %s]"), 14503 bfd_get_filename (abfd)); 14504 gdb_assert (HOST_CHAR_BIT == 8); 14505 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0') 14506 return NULL; 14507 return (char *) (dwarf2_per_objfile->str.buffer + str_offset); 14508 } 14509 14510 /* Read a string at offset STR_OFFSET in the .debug_str section from 14511 the .dwz file DWZ. Throw an error if the offset is too large. If 14512 the string consists of a single NUL byte, return NULL; otherwise 14513 return a pointer to the string. */ 14514 14515 static char * 14516 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset) 14517 { 14518 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str); 14519 14520 if (dwz->str.buffer == NULL) 14521 error (_("DW_FORM_GNU_strp_alt used without .debug_str " 14522 "section [in module %s]"), 14523 bfd_get_filename (dwz->dwz_bfd)); 14524 if (str_offset >= dwz->str.size) 14525 error (_("DW_FORM_GNU_strp_alt pointing outside of " 14526 ".debug_str section [in module %s]"), 14527 bfd_get_filename (dwz->dwz_bfd)); 14528 gdb_assert (HOST_CHAR_BIT == 8); 14529 if (dwz->str.buffer[str_offset] == '\0') 14530 return NULL; 14531 return (char *) (dwz->str.buffer + str_offset); 14532 } 14533 14534 static char * 14535 read_indirect_string (bfd *abfd, gdb_byte *buf, 14536 const struct comp_unit_head *cu_header, 14537 unsigned int *bytes_read_ptr) 14538 { 14539 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr); 14540 14541 return read_indirect_string_at_offset (abfd, str_offset); 14542 } 14543 14544 static ULONGEST 14545 read_unsigned_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr) 14546 { 14547 ULONGEST result; 14548 unsigned int num_read; 14549 int i, shift; 14550 unsigned char byte; 14551 14552 result = 0; 14553 shift = 0; 14554 num_read = 0; 14555 i = 0; 14556 while (1) 14557 { 14558 byte = bfd_get_8 (abfd, buf); 14559 buf++; 14560 num_read++; 14561 result |= ((ULONGEST) (byte & 127) << shift); 14562 if ((byte & 128) == 0) 14563 { 14564 break; 14565 } 14566 shift += 7; 14567 } 14568 *bytes_read_ptr = num_read; 14569 return result; 14570 } 14571 14572 static LONGEST 14573 read_signed_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr) 14574 { 14575 LONGEST result; 14576 int i, shift, num_read; 14577 unsigned char byte; 14578 14579 result = 0; 14580 shift = 0; 14581 num_read = 0; 14582 i = 0; 14583 while (1) 14584 { 14585 byte = bfd_get_8 (abfd, buf); 14586 buf++; 14587 num_read++; 14588 result |= ((LONGEST) (byte & 127) << shift); 14589 shift += 7; 14590 if ((byte & 128) == 0) 14591 { 14592 break; 14593 } 14594 } 14595 if ((shift < 8 * sizeof (result)) && (byte & 0x40)) 14596 result |= -(((LONGEST) 1) << shift); 14597 *bytes_read_ptr = num_read; 14598 return result; 14599 } 14600 14601 /* Given index ADDR_INDEX in .debug_addr, fetch the value. 14602 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero. 14603 ADDR_SIZE is the size of addresses from the CU header. */ 14604 14605 static CORE_ADDR 14606 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size) 14607 { 14608 struct objfile *objfile = dwarf2_per_objfile->objfile; 14609 bfd *abfd = objfile->obfd; 14610 const gdb_byte *info_ptr; 14611 14612 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr); 14613 if (dwarf2_per_objfile->addr.buffer == NULL) 14614 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"), 14615 objfile->name); 14616 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size) 14617 error (_("DW_FORM_addr_index pointing outside of " 14618 ".debug_addr section [in module %s]"), 14619 objfile->name); 14620 info_ptr = (dwarf2_per_objfile->addr.buffer 14621 + addr_base + addr_index * addr_size); 14622 if (addr_size == 4) 14623 return bfd_get_32 (abfd, info_ptr); 14624 else 14625 return bfd_get_64 (abfd, info_ptr); 14626 } 14627 14628 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */ 14629 14630 static CORE_ADDR 14631 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index) 14632 { 14633 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size); 14634 } 14635 14636 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */ 14637 14638 static CORE_ADDR 14639 read_addr_index_from_leb128 (struct dwarf2_cu *cu, gdb_byte *info_ptr, 14640 unsigned int *bytes_read) 14641 { 14642 bfd *abfd = cu->objfile->obfd; 14643 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read); 14644 14645 return read_addr_index (cu, addr_index); 14646 } 14647 14648 /* Data structure to pass results from dwarf2_read_addr_index_reader 14649 back to dwarf2_read_addr_index. */ 14650 14651 struct dwarf2_read_addr_index_data 14652 { 14653 ULONGEST addr_base; 14654 int addr_size; 14655 }; 14656 14657 /* die_reader_func for dwarf2_read_addr_index. */ 14658 14659 static void 14660 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader, 14661 gdb_byte *info_ptr, 14662 struct die_info *comp_unit_die, 14663 int has_children, 14664 void *data) 14665 { 14666 struct dwarf2_cu *cu = reader->cu; 14667 struct dwarf2_read_addr_index_data *aidata = 14668 (struct dwarf2_read_addr_index_data *) data; 14669 14670 aidata->addr_base = cu->addr_base; 14671 aidata->addr_size = cu->header.addr_size; 14672 } 14673 14674 /* Given an index in .debug_addr, fetch the value. 14675 NOTE: This can be called during dwarf expression evaluation, 14676 long after the debug information has been read, and thus per_cu->cu 14677 may no longer exist. */ 14678 14679 CORE_ADDR 14680 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu, 14681 unsigned int addr_index) 14682 { 14683 struct objfile *objfile = per_cu->objfile; 14684 struct dwarf2_cu *cu = per_cu->cu; 14685 ULONGEST addr_base; 14686 int addr_size; 14687 14688 /* This is intended to be called from outside this file. */ 14689 dw2_setup (objfile); 14690 14691 /* We need addr_base and addr_size. 14692 If we don't have PER_CU->cu, we have to get it. 14693 Nasty, but the alternative is storing the needed info in PER_CU, 14694 which at this point doesn't seem justified: it's not clear how frequently 14695 it would get used and it would increase the size of every PER_CU. 14696 Entry points like dwarf2_per_cu_addr_size do a similar thing 14697 so we're not in uncharted territory here. 14698 Alas we need to be a bit more complicated as addr_base is contained 14699 in the DIE. 14700 14701 We don't need to read the entire CU(/TU). 14702 We just need the header and top level die. 14703 14704 IWBN to use the aging mechanism to let us lazily later discard the CU. 14705 For now we skip this optimization. */ 14706 14707 if (cu != NULL) 14708 { 14709 addr_base = cu->addr_base; 14710 addr_size = cu->header.addr_size; 14711 } 14712 else 14713 { 14714 struct dwarf2_read_addr_index_data aidata; 14715 14716 /* Note: We can't use init_cutu_and_read_dies_simple here, 14717 we need addr_base. */ 14718 init_cutu_and_read_dies (per_cu, NULL, 0, 0, 14719 dwarf2_read_addr_index_reader, &aidata); 14720 addr_base = aidata.addr_base; 14721 addr_size = aidata.addr_size; 14722 } 14723 14724 return read_addr_index_1 (addr_index, addr_base, addr_size); 14725 } 14726 14727 /* Given a DW_AT_str_index, fetch the string. */ 14728 14729 static char * 14730 read_str_index (const struct die_reader_specs *reader, 14731 struct dwarf2_cu *cu, ULONGEST str_index) 14732 { 14733 struct objfile *objfile = dwarf2_per_objfile->objfile; 14734 const char *dwo_name = objfile->name; 14735 bfd *abfd = objfile->obfd; 14736 struct dwo_sections *sections = &reader->dwo_file->sections; 14737 gdb_byte *info_ptr; 14738 ULONGEST str_offset; 14739 14740 dwarf2_read_section (objfile, §ions->str); 14741 dwarf2_read_section (objfile, §ions->str_offsets); 14742 if (sections->str.buffer == NULL) 14743 error (_("DW_FORM_str_index used without .debug_str.dwo section" 14744 " in CU at offset 0x%lx [in module %s]"), 14745 (long) cu->header.offset.sect_off, dwo_name); 14746 if (sections->str_offsets.buffer == NULL) 14747 error (_("DW_FORM_str_index used without .debug_str_offsets.dwo section" 14748 " in CU at offset 0x%lx [in module %s]"), 14749 (long) cu->header.offset.sect_off, dwo_name); 14750 if (str_index * cu->header.offset_size >= sections->str_offsets.size) 14751 error (_("DW_FORM_str_index pointing outside of .debug_str_offsets.dwo" 14752 " section in CU at offset 0x%lx [in module %s]"), 14753 (long) cu->header.offset.sect_off, dwo_name); 14754 info_ptr = (sections->str_offsets.buffer 14755 + str_index * cu->header.offset_size); 14756 if (cu->header.offset_size == 4) 14757 str_offset = bfd_get_32 (abfd, info_ptr); 14758 else 14759 str_offset = bfd_get_64 (abfd, info_ptr); 14760 if (str_offset >= sections->str.size) 14761 error (_("Offset from DW_FORM_str_index pointing outside of" 14762 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"), 14763 (long) cu->header.offset.sect_off, dwo_name); 14764 return (char *) (sections->str.buffer + str_offset); 14765 } 14766 14767 /* Return the length of an LEB128 number in BUF. */ 14768 14769 static int 14770 leb128_size (const gdb_byte *buf) 14771 { 14772 const gdb_byte *begin = buf; 14773 gdb_byte byte; 14774 14775 while (1) 14776 { 14777 byte = *buf++; 14778 if ((byte & 128) == 0) 14779 return buf - begin; 14780 } 14781 } 14782 14783 static void 14784 set_cu_language (unsigned int lang, struct dwarf2_cu *cu) 14785 { 14786 switch (lang) 14787 { 14788 case DW_LANG_C89: 14789 case DW_LANG_C99: 14790 case DW_LANG_C: 14791 cu->language = language_c; 14792 break; 14793 case DW_LANG_C_plus_plus: 14794 cu->language = language_cplus; 14795 break; 14796 case DW_LANG_D: 14797 cu->language = language_d; 14798 break; 14799 case DW_LANG_Fortran77: 14800 case DW_LANG_Fortran90: 14801 case DW_LANG_Fortran95: 14802 cu->language = language_fortran; 14803 break; 14804 case DW_LANG_Go: 14805 cu->language = language_go; 14806 break; 14807 case DW_LANG_Mips_Assembler: 14808 cu->language = language_asm; 14809 break; 14810 case DW_LANG_Java: 14811 cu->language = language_java; 14812 break; 14813 case DW_LANG_Ada83: 14814 case DW_LANG_Ada95: 14815 cu->language = language_ada; 14816 break; 14817 case DW_LANG_Modula2: 14818 cu->language = language_m2; 14819 break; 14820 case DW_LANG_Pascal83: 14821 cu->language = language_pascal; 14822 break; 14823 case DW_LANG_ObjC: 14824 cu->language = language_objc; 14825 break; 14826 case DW_LANG_Cobol74: 14827 case DW_LANG_Cobol85: 14828 default: 14829 cu->language = language_minimal; 14830 break; 14831 } 14832 cu->language_defn = language_def (cu->language); 14833 } 14834 14835 /* Return the named attribute or NULL if not there. */ 14836 14837 static struct attribute * 14838 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu) 14839 { 14840 for (;;) 14841 { 14842 unsigned int i; 14843 struct attribute *spec = NULL; 14844 14845 for (i = 0; i < die->num_attrs; ++i) 14846 { 14847 if (die->attrs[i].name == name) 14848 return &die->attrs[i]; 14849 if (die->attrs[i].name == DW_AT_specification 14850 || die->attrs[i].name == DW_AT_abstract_origin) 14851 spec = &die->attrs[i]; 14852 } 14853 14854 if (!spec) 14855 break; 14856 14857 die = follow_die_ref (die, spec, &cu); 14858 } 14859 14860 return NULL; 14861 } 14862 14863 /* Return the named attribute or NULL if not there, 14864 but do not follow DW_AT_specification, etc. 14865 This is for use in contexts where we're reading .debug_types dies. 14866 Following DW_AT_specification, DW_AT_abstract_origin will take us 14867 back up the chain, and we want to go down. */ 14868 14869 static struct attribute * 14870 dwarf2_attr_no_follow (struct die_info *die, unsigned int name) 14871 { 14872 unsigned int i; 14873 14874 for (i = 0; i < die->num_attrs; ++i) 14875 if (die->attrs[i].name == name) 14876 return &die->attrs[i]; 14877 14878 return NULL; 14879 } 14880 14881 /* Return non-zero iff the attribute NAME is defined for the given DIE, 14882 and holds a non-zero value. This function should only be used for 14883 DW_FORM_flag or DW_FORM_flag_present attributes. */ 14884 14885 static int 14886 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu) 14887 { 14888 struct attribute *attr = dwarf2_attr (die, name, cu); 14889 14890 return (attr && DW_UNSND (attr)); 14891 } 14892 14893 static int 14894 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu) 14895 { 14896 /* A DIE is a declaration if it has a DW_AT_declaration attribute 14897 which value is non-zero. However, we have to be careful with 14898 DIEs having a DW_AT_specification attribute, because dwarf2_attr() 14899 (via dwarf2_flag_true_p) follows this attribute. So we may 14900 end up accidently finding a declaration attribute that belongs 14901 to a different DIE referenced by the specification attribute, 14902 even though the given DIE does not have a declaration attribute. */ 14903 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu) 14904 && dwarf2_attr (die, DW_AT_specification, cu) == NULL); 14905 } 14906 14907 /* Return the die giving the specification for DIE, if there is 14908 one. *SPEC_CU is the CU containing DIE on input, and the CU 14909 containing the return value on output. If there is no 14910 specification, but there is an abstract origin, that is 14911 returned. */ 14912 14913 static struct die_info * 14914 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu) 14915 { 14916 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification, 14917 *spec_cu); 14918 14919 if (spec_attr == NULL) 14920 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu); 14921 14922 if (spec_attr == NULL) 14923 return NULL; 14924 else 14925 return follow_die_ref (die, spec_attr, spec_cu); 14926 } 14927 14928 /* Free the line_header structure *LH, and any arrays and strings it 14929 refers to. 14930 NOTE: This is also used as a "cleanup" function. */ 14931 14932 static void 14933 free_line_header (struct line_header *lh) 14934 { 14935 if (lh->standard_opcode_lengths) 14936 xfree (lh->standard_opcode_lengths); 14937 14938 /* Remember that all the lh->file_names[i].name pointers are 14939 pointers into debug_line_buffer, and don't need to be freed. */ 14940 if (lh->file_names) 14941 xfree (lh->file_names); 14942 14943 /* Similarly for the include directory names. */ 14944 if (lh->include_dirs) 14945 xfree (lh->include_dirs); 14946 14947 xfree (lh); 14948 } 14949 14950 /* Add an entry to LH's include directory table. */ 14951 14952 static void 14953 add_include_dir (struct line_header *lh, char *include_dir) 14954 { 14955 /* Grow the array if necessary. */ 14956 if (lh->include_dirs_size == 0) 14957 { 14958 lh->include_dirs_size = 1; /* for testing */ 14959 lh->include_dirs = xmalloc (lh->include_dirs_size 14960 * sizeof (*lh->include_dirs)); 14961 } 14962 else if (lh->num_include_dirs >= lh->include_dirs_size) 14963 { 14964 lh->include_dirs_size *= 2; 14965 lh->include_dirs = xrealloc (lh->include_dirs, 14966 (lh->include_dirs_size 14967 * sizeof (*lh->include_dirs))); 14968 } 14969 14970 lh->include_dirs[lh->num_include_dirs++] = include_dir; 14971 } 14972 14973 /* Add an entry to LH's file name table. */ 14974 14975 static void 14976 add_file_name (struct line_header *lh, 14977 char *name, 14978 unsigned int dir_index, 14979 unsigned int mod_time, 14980 unsigned int length) 14981 { 14982 struct file_entry *fe; 14983 14984 /* Grow the array if necessary. */ 14985 if (lh->file_names_size == 0) 14986 { 14987 lh->file_names_size = 1; /* for testing */ 14988 lh->file_names = xmalloc (lh->file_names_size 14989 * sizeof (*lh->file_names)); 14990 } 14991 else if (lh->num_file_names >= lh->file_names_size) 14992 { 14993 lh->file_names_size *= 2; 14994 lh->file_names = xrealloc (lh->file_names, 14995 (lh->file_names_size 14996 * sizeof (*lh->file_names))); 14997 } 14998 14999 fe = &lh->file_names[lh->num_file_names++]; 15000 fe->name = name; 15001 fe->dir_index = dir_index; 15002 fe->mod_time = mod_time; 15003 fe->length = length; 15004 fe->included_p = 0; 15005 fe->symtab = NULL; 15006 } 15007 15008 /* A convenience function to find the proper .debug_line section for a 15009 CU. */ 15010 15011 static struct dwarf2_section_info * 15012 get_debug_line_section (struct dwarf2_cu *cu) 15013 { 15014 struct dwarf2_section_info *section; 15015 15016 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the 15017 DWO file. */ 15018 if (cu->dwo_unit && cu->per_cu->is_debug_types) 15019 section = &cu->dwo_unit->dwo_file->sections.line; 15020 else if (cu->per_cu->is_dwz) 15021 { 15022 struct dwz_file *dwz = dwarf2_get_dwz_file (); 15023 15024 section = &dwz->line; 15025 } 15026 else 15027 section = &dwarf2_per_objfile->line; 15028 15029 return section; 15030 } 15031 15032 /* Read the statement program header starting at OFFSET in 15033 .debug_line, or .debug_line.dwo. Return a pointer 15034 to a struct line_header, allocated using xmalloc. 15035 15036 NOTE: the strings in the include directory and file name tables of 15037 the returned object point into the dwarf line section buffer, 15038 and must not be freed. */ 15039 15040 static struct line_header * 15041 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu) 15042 { 15043 struct cleanup *back_to; 15044 struct line_header *lh; 15045 gdb_byte *line_ptr; 15046 unsigned int bytes_read, offset_size; 15047 int i; 15048 char *cur_dir, *cur_file; 15049 struct dwarf2_section_info *section; 15050 bfd *abfd; 15051 15052 section = get_debug_line_section (cu); 15053 dwarf2_read_section (dwarf2_per_objfile->objfile, section); 15054 if (section->buffer == NULL) 15055 { 15056 if (cu->dwo_unit && cu->per_cu->is_debug_types) 15057 complaint (&symfile_complaints, _("missing .debug_line.dwo section")); 15058 else 15059 complaint (&symfile_complaints, _("missing .debug_line section")); 15060 return 0; 15061 } 15062 15063 /* We can't do this until we know the section is non-empty. 15064 Only then do we know we have such a section. */ 15065 abfd = section->asection->owner; 15066 15067 /* Make sure that at least there's room for the total_length field. 15068 That could be 12 bytes long, but we're just going to fudge that. */ 15069 if (offset + 4 >= section->size) 15070 { 15071 dwarf2_statement_list_fits_in_line_number_section_complaint (); 15072 return 0; 15073 } 15074 15075 lh = xmalloc (sizeof (*lh)); 15076 memset (lh, 0, sizeof (*lh)); 15077 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header, 15078 (void *) lh); 15079 15080 line_ptr = section->buffer + offset; 15081 15082 /* Read in the header. */ 15083 lh->total_length = 15084 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header, 15085 &bytes_read, &offset_size); 15086 line_ptr += bytes_read; 15087 if (line_ptr + lh->total_length > (section->buffer + section->size)) 15088 { 15089 dwarf2_statement_list_fits_in_line_number_section_complaint (); 15090 return 0; 15091 } 15092 lh->statement_program_end = line_ptr + lh->total_length; 15093 lh->version = read_2_bytes (abfd, line_ptr); 15094 line_ptr += 2; 15095 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size); 15096 line_ptr += offset_size; 15097 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr); 15098 line_ptr += 1; 15099 if (lh->version >= 4) 15100 { 15101 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr); 15102 line_ptr += 1; 15103 } 15104 else 15105 lh->maximum_ops_per_instruction = 1; 15106 15107 if (lh->maximum_ops_per_instruction == 0) 15108 { 15109 lh->maximum_ops_per_instruction = 1; 15110 complaint (&symfile_complaints, 15111 _("invalid maximum_ops_per_instruction " 15112 "in `.debug_line' section")); 15113 } 15114 15115 lh->default_is_stmt = read_1_byte (abfd, line_ptr); 15116 line_ptr += 1; 15117 lh->line_base = read_1_signed_byte (abfd, line_ptr); 15118 line_ptr += 1; 15119 lh->line_range = read_1_byte (abfd, line_ptr); 15120 line_ptr += 1; 15121 lh->opcode_base = read_1_byte (abfd, line_ptr); 15122 line_ptr += 1; 15123 lh->standard_opcode_lengths 15124 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0])); 15125 15126 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */ 15127 for (i = 1; i < lh->opcode_base; ++i) 15128 { 15129 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr); 15130 line_ptr += 1; 15131 } 15132 15133 /* Read directory table. */ 15134 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL) 15135 { 15136 line_ptr += bytes_read; 15137 add_include_dir (lh, cur_dir); 15138 } 15139 line_ptr += bytes_read; 15140 15141 /* Read file name table. */ 15142 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL) 15143 { 15144 unsigned int dir_index, mod_time, length; 15145 15146 line_ptr += bytes_read; 15147 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15148 line_ptr += bytes_read; 15149 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15150 line_ptr += bytes_read; 15151 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15152 line_ptr += bytes_read; 15153 15154 add_file_name (lh, cur_file, dir_index, mod_time, length); 15155 } 15156 line_ptr += bytes_read; 15157 lh->statement_program_start = line_ptr; 15158 15159 if (line_ptr > (section->buffer + section->size)) 15160 complaint (&symfile_complaints, 15161 _("line number info header doesn't " 15162 "fit in `.debug_line' section")); 15163 15164 discard_cleanups (back_to); 15165 return lh; 15166 } 15167 15168 /* Subroutine of dwarf_decode_lines to simplify it. 15169 Return the file name of the psymtab for included file FILE_INDEX 15170 in line header LH of PST. 15171 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown. 15172 If space for the result is malloc'd, it will be freed by a cleanup. 15173 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. 15174 15175 The function creates dangling cleanup registration. */ 15176 15177 static char * 15178 psymtab_include_file_name (const struct line_header *lh, int file_index, 15179 const struct partial_symtab *pst, 15180 const char *comp_dir) 15181 { 15182 const struct file_entry fe = lh->file_names [file_index]; 15183 char *include_name = fe.name; 15184 char *include_name_to_compare = include_name; 15185 char *dir_name = NULL; 15186 const char *pst_filename; 15187 char *copied_name = NULL; 15188 int file_is_pst; 15189 15190 if (fe.dir_index) 15191 dir_name = lh->include_dirs[fe.dir_index - 1]; 15192 15193 if (!IS_ABSOLUTE_PATH (include_name) 15194 && (dir_name != NULL || comp_dir != NULL)) 15195 { 15196 /* Avoid creating a duplicate psymtab for PST. 15197 We do this by comparing INCLUDE_NAME and PST_FILENAME. 15198 Before we do the comparison, however, we need to account 15199 for DIR_NAME and COMP_DIR. 15200 First prepend dir_name (if non-NULL). If we still don't 15201 have an absolute path prepend comp_dir (if non-NULL). 15202 However, the directory we record in the include-file's 15203 psymtab does not contain COMP_DIR (to match the 15204 corresponding symtab(s)). 15205 15206 Example: 15207 15208 bash$ cd /tmp 15209 bash$ gcc -g ./hello.c 15210 include_name = "hello.c" 15211 dir_name = "." 15212 DW_AT_comp_dir = comp_dir = "/tmp" 15213 DW_AT_name = "./hello.c" */ 15214 15215 if (dir_name != NULL) 15216 { 15217 include_name = concat (dir_name, SLASH_STRING, 15218 include_name, (char *)NULL); 15219 include_name_to_compare = include_name; 15220 make_cleanup (xfree, include_name); 15221 } 15222 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL) 15223 { 15224 include_name_to_compare = concat (comp_dir, SLASH_STRING, 15225 include_name, (char *)NULL); 15226 } 15227 } 15228 15229 pst_filename = pst->filename; 15230 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL) 15231 { 15232 copied_name = concat (pst->dirname, SLASH_STRING, 15233 pst_filename, (char *)NULL); 15234 pst_filename = copied_name; 15235 } 15236 15237 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0; 15238 15239 if (include_name_to_compare != include_name) 15240 xfree (include_name_to_compare); 15241 if (copied_name != NULL) 15242 xfree (copied_name); 15243 15244 if (file_is_pst) 15245 return NULL; 15246 return include_name; 15247 } 15248 15249 /* Ignore this record_line request. */ 15250 15251 static void 15252 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc) 15253 { 15254 return; 15255 } 15256 15257 /* Subroutine of dwarf_decode_lines to simplify it. 15258 Process the line number information in LH. */ 15259 15260 static void 15261 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir, 15262 struct dwarf2_cu *cu, struct partial_symtab *pst) 15263 { 15264 gdb_byte *line_ptr, *extended_end; 15265 gdb_byte *line_end; 15266 unsigned int bytes_read, extended_len; 15267 unsigned char op_code, extended_op, adj_opcode; 15268 CORE_ADDR baseaddr; 15269 struct objfile *objfile = cu->objfile; 15270 bfd *abfd = objfile->obfd; 15271 struct gdbarch *gdbarch = get_objfile_arch (objfile); 15272 const int decode_for_pst_p = (pst != NULL); 15273 struct subfile *last_subfile = NULL; 15274 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc) 15275 = record_line; 15276 15277 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 15278 15279 line_ptr = lh->statement_program_start; 15280 line_end = lh->statement_program_end; 15281 15282 /* Read the statement sequences until there's nothing left. */ 15283 while (line_ptr < line_end) 15284 { 15285 /* state machine registers */ 15286 CORE_ADDR address = 0; 15287 unsigned int file = 1; 15288 unsigned int line = 1; 15289 unsigned int column = 0; 15290 int is_stmt = lh->default_is_stmt; 15291 int basic_block = 0; 15292 int end_sequence = 0; 15293 CORE_ADDR addr; 15294 unsigned char op_index = 0; 15295 15296 if (!decode_for_pst_p && lh->num_file_names >= file) 15297 { 15298 /* Start a subfile for the current file of the state machine. */ 15299 /* lh->include_dirs and lh->file_names are 0-based, but the 15300 directory and file name numbers in the statement program 15301 are 1-based. */ 15302 struct file_entry *fe = &lh->file_names[file - 1]; 15303 char *dir = NULL; 15304 15305 if (fe->dir_index) 15306 dir = lh->include_dirs[fe->dir_index - 1]; 15307 15308 dwarf2_start_subfile (fe->name, dir, comp_dir); 15309 } 15310 15311 /* Decode the table. */ 15312 while (!end_sequence) 15313 { 15314 op_code = read_1_byte (abfd, line_ptr); 15315 line_ptr += 1; 15316 if (line_ptr > line_end) 15317 { 15318 dwarf2_debug_line_missing_end_sequence_complaint (); 15319 break; 15320 } 15321 15322 if (op_code >= lh->opcode_base) 15323 { 15324 /* Special operand. */ 15325 adj_opcode = op_code - lh->opcode_base; 15326 address += (((op_index + (adj_opcode / lh->line_range)) 15327 / lh->maximum_ops_per_instruction) 15328 * lh->minimum_instruction_length); 15329 op_index = ((op_index + (adj_opcode / lh->line_range)) 15330 % lh->maximum_ops_per_instruction); 15331 line += lh->line_base + (adj_opcode % lh->line_range); 15332 if (lh->num_file_names < file || file == 0) 15333 dwarf2_debug_line_missing_file_complaint (); 15334 /* For now we ignore lines not starting on an 15335 instruction boundary. */ 15336 else if (op_index == 0) 15337 { 15338 lh->file_names[file - 1].included_p = 1; 15339 if (!decode_for_pst_p && is_stmt) 15340 { 15341 if (last_subfile != current_subfile) 15342 { 15343 addr = gdbarch_addr_bits_remove (gdbarch, address); 15344 if (last_subfile) 15345 (*p_record_line) (last_subfile, 0, addr); 15346 last_subfile = current_subfile; 15347 } 15348 /* Append row to matrix using current values. */ 15349 addr = gdbarch_addr_bits_remove (gdbarch, address); 15350 (*p_record_line) (current_subfile, line, addr); 15351 } 15352 } 15353 basic_block = 0; 15354 } 15355 else switch (op_code) 15356 { 15357 case DW_LNS_extended_op: 15358 extended_len = read_unsigned_leb128 (abfd, line_ptr, 15359 &bytes_read); 15360 line_ptr += bytes_read; 15361 extended_end = line_ptr + extended_len; 15362 extended_op = read_1_byte (abfd, line_ptr); 15363 line_ptr += 1; 15364 switch (extended_op) 15365 { 15366 case DW_LNE_end_sequence: 15367 p_record_line = record_line; 15368 end_sequence = 1; 15369 break; 15370 case DW_LNE_set_address: 15371 address = read_address (abfd, line_ptr, cu, &bytes_read); 15372 15373 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero) 15374 { 15375 /* This line table is for a function which has been 15376 GCd by the linker. Ignore it. PR gdb/12528 */ 15377 15378 long line_offset 15379 = line_ptr - get_debug_line_section (cu)->buffer; 15380 15381 complaint (&symfile_complaints, 15382 _(".debug_line address at offset 0x%lx is 0 " 15383 "[in module %s]"), 15384 line_offset, objfile->name); 15385 p_record_line = noop_record_line; 15386 } 15387 15388 op_index = 0; 15389 line_ptr += bytes_read; 15390 address += baseaddr; 15391 break; 15392 case DW_LNE_define_file: 15393 { 15394 char *cur_file; 15395 unsigned int dir_index, mod_time, length; 15396 15397 cur_file = read_direct_string (abfd, line_ptr, 15398 &bytes_read); 15399 line_ptr += bytes_read; 15400 dir_index = 15401 read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15402 line_ptr += bytes_read; 15403 mod_time = 15404 read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15405 line_ptr += bytes_read; 15406 length = 15407 read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15408 line_ptr += bytes_read; 15409 add_file_name (lh, cur_file, dir_index, mod_time, length); 15410 } 15411 break; 15412 case DW_LNE_set_discriminator: 15413 /* The discriminator is not interesting to the debugger; 15414 just ignore it. */ 15415 line_ptr = extended_end; 15416 break; 15417 default: 15418 complaint (&symfile_complaints, 15419 _("mangled .debug_line section")); 15420 return; 15421 } 15422 /* Make sure that we parsed the extended op correctly. If e.g. 15423 we expected a different address size than the producer used, 15424 we may have read the wrong number of bytes. */ 15425 if (line_ptr != extended_end) 15426 { 15427 complaint (&symfile_complaints, 15428 _("mangled .debug_line section")); 15429 return; 15430 } 15431 break; 15432 case DW_LNS_copy: 15433 if (lh->num_file_names < file || file == 0) 15434 dwarf2_debug_line_missing_file_complaint (); 15435 else 15436 { 15437 lh->file_names[file - 1].included_p = 1; 15438 if (!decode_for_pst_p && is_stmt) 15439 { 15440 if (last_subfile != current_subfile) 15441 { 15442 addr = gdbarch_addr_bits_remove (gdbarch, address); 15443 if (last_subfile) 15444 (*p_record_line) (last_subfile, 0, addr); 15445 last_subfile = current_subfile; 15446 } 15447 addr = gdbarch_addr_bits_remove (gdbarch, address); 15448 (*p_record_line) (current_subfile, line, addr); 15449 } 15450 } 15451 basic_block = 0; 15452 break; 15453 case DW_LNS_advance_pc: 15454 { 15455 CORE_ADDR adjust 15456 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15457 15458 address += (((op_index + adjust) 15459 / lh->maximum_ops_per_instruction) 15460 * lh->minimum_instruction_length); 15461 op_index = ((op_index + adjust) 15462 % lh->maximum_ops_per_instruction); 15463 line_ptr += bytes_read; 15464 } 15465 break; 15466 case DW_LNS_advance_line: 15467 line += read_signed_leb128 (abfd, line_ptr, &bytes_read); 15468 line_ptr += bytes_read; 15469 break; 15470 case DW_LNS_set_file: 15471 { 15472 /* The arrays lh->include_dirs and lh->file_names are 15473 0-based, but the directory and file name numbers in 15474 the statement program are 1-based. */ 15475 struct file_entry *fe; 15476 char *dir = NULL; 15477 15478 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15479 line_ptr += bytes_read; 15480 if (lh->num_file_names < file || file == 0) 15481 dwarf2_debug_line_missing_file_complaint (); 15482 else 15483 { 15484 fe = &lh->file_names[file - 1]; 15485 if (fe->dir_index) 15486 dir = lh->include_dirs[fe->dir_index - 1]; 15487 if (!decode_for_pst_p) 15488 { 15489 last_subfile = current_subfile; 15490 dwarf2_start_subfile (fe->name, dir, comp_dir); 15491 } 15492 } 15493 } 15494 break; 15495 case DW_LNS_set_column: 15496 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15497 line_ptr += bytes_read; 15498 break; 15499 case DW_LNS_negate_stmt: 15500 is_stmt = (!is_stmt); 15501 break; 15502 case DW_LNS_set_basic_block: 15503 basic_block = 1; 15504 break; 15505 /* Add to the address register of the state machine the 15506 address increment value corresponding to special opcode 15507 255. I.e., this value is scaled by the minimum 15508 instruction length since special opcode 255 would have 15509 scaled the increment. */ 15510 case DW_LNS_const_add_pc: 15511 { 15512 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range; 15513 15514 address += (((op_index + adjust) 15515 / lh->maximum_ops_per_instruction) 15516 * lh->minimum_instruction_length); 15517 op_index = ((op_index + adjust) 15518 % lh->maximum_ops_per_instruction); 15519 } 15520 break; 15521 case DW_LNS_fixed_advance_pc: 15522 address += read_2_bytes (abfd, line_ptr); 15523 op_index = 0; 15524 line_ptr += 2; 15525 break; 15526 default: 15527 { 15528 /* Unknown standard opcode, ignore it. */ 15529 int i; 15530 15531 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++) 15532 { 15533 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 15534 line_ptr += bytes_read; 15535 } 15536 } 15537 } 15538 } 15539 if (lh->num_file_names < file || file == 0) 15540 dwarf2_debug_line_missing_file_complaint (); 15541 else 15542 { 15543 lh->file_names[file - 1].included_p = 1; 15544 if (!decode_for_pst_p) 15545 { 15546 addr = gdbarch_addr_bits_remove (gdbarch, address); 15547 (*p_record_line) (current_subfile, 0, addr); 15548 } 15549 } 15550 } 15551 } 15552 15553 /* Decode the Line Number Program (LNP) for the given line_header 15554 structure and CU. The actual information extracted and the type 15555 of structures created from the LNP depends on the value of PST. 15556 15557 1. If PST is NULL, then this procedure uses the data from the program 15558 to create all necessary symbol tables, and their linetables. 15559 15560 2. If PST is not NULL, this procedure reads the program to determine 15561 the list of files included by the unit represented by PST, and 15562 builds all the associated partial symbol tables. 15563 15564 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown. 15565 It is used for relative paths in the line table. 15566 NOTE: When processing partial symtabs (pst != NULL), 15567 comp_dir == pst->dirname. 15568 15569 NOTE: It is important that psymtabs have the same file name (via strcmp) 15570 as the corresponding symtab. Since COMP_DIR is not used in the name of the 15571 symtab we don't use it in the name of the psymtabs we create. 15572 E.g. expand_line_sal requires this when finding psymtabs to expand. 15573 A good testcase for this is mb-inline.exp. */ 15574 15575 static void 15576 dwarf_decode_lines (struct line_header *lh, const char *comp_dir, 15577 struct dwarf2_cu *cu, struct partial_symtab *pst, 15578 int want_line_info) 15579 { 15580 struct objfile *objfile = cu->objfile; 15581 const int decode_for_pst_p = (pst != NULL); 15582 struct subfile *first_subfile = current_subfile; 15583 15584 if (want_line_info) 15585 dwarf_decode_lines_1 (lh, comp_dir, cu, pst); 15586 15587 if (decode_for_pst_p) 15588 { 15589 int file_index; 15590 15591 /* Now that we're done scanning the Line Header Program, we can 15592 create the psymtab of each included file. */ 15593 for (file_index = 0; file_index < lh->num_file_names; file_index++) 15594 if (lh->file_names[file_index].included_p == 1) 15595 { 15596 char *include_name = 15597 psymtab_include_file_name (lh, file_index, pst, comp_dir); 15598 if (include_name != NULL) 15599 dwarf2_create_include_psymtab (include_name, pst, objfile); 15600 } 15601 } 15602 else 15603 { 15604 /* Make sure a symtab is created for every file, even files 15605 which contain only variables (i.e. no code with associated 15606 line numbers). */ 15607 int i; 15608 15609 for (i = 0; i < lh->num_file_names; i++) 15610 { 15611 char *dir = NULL; 15612 struct file_entry *fe; 15613 15614 fe = &lh->file_names[i]; 15615 if (fe->dir_index) 15616 dir = lh->include_dirs[fe->dir_index - 1]; 15617 dwarf2_start_subfile (fe->name, dir, comp_dir); 15618 15619 /* Skip the main file; we don't need it, and it must be 15620 allocated last, so that it will show up before the 15621 non-primary symtabs in the objfile's symtab list. */ 15622 if (current_subfile == first_subfile) 15623 continue; 15624 15625 if (current_subfile->symtab == NULL) 15626 current_subfile->symtab = allocate_symtab (current_subfile->name, 15627 objfile); 15628 fe->symtab = current_subfile->symtab; 15629 } 15630 } 15631 } 15632 15633 /* Start a subfile for DWARF. FILENAME is the name of the file and 15634 DIRNAME the name of the source directory which contains FILENAME 15635 or NULL if not known. COMP_DIR is the compilation directory for the 15636 linetable's compilation unit or NULL if not known. 15637 This routine tries to keep line numbers from identical absolute and 15638 relative file names in a common subfile. 15639 15640 Using the `list' example from the GDB testsuite, which resides in 15641 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename 15642 of /srcdir/list0.c yields the following debugging information for list0.c: 15643 15644 DW_AT_name: /srcdir/list0.c 15645 DW_AT_comp_dir: /compdir 15646 files.files[0].name: list0.h 15647 files.files[0].dir: /srcdir 15648 files.files[1].name: list0.c 15649 files.files[1].dir: /srcdir 15650 15651 The line number information for list0.c has to end up in a single 15652 subfile, so that `break /srcdir/list0.c:1' works as expected. 15653 start_subfile will ensure that this happens provided that we pass the 15654 concatenation of files.files[1].dir and files.files[1].name as the 15655 subfile's name. */ 15656 15657 static void 15658 dwarf2_start_subfile (char *filename, const char *dirname, 15659 const char *comp_dir) 15660 { 15661 char *fullname; 15662 15663 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir). 15664 `start_symtab' will always pass the contents of DW_AT_comp_dir as 15665 second argument to start_subfile. To be consistent, we do the 15666 same here. In order not to lose the line information directory, 15667 we concatenate it to the filename when it makes sense. 15668 Note that the Dwarf3 standard says (speaking of filenames in line 15669 information): ``The directory index is ignored for file names 15670 that represent full path names''. Thus ignoring dirname in the 15671 `else' branch below isn't an issue. */ 15672 15673 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL) 15674 fullname = concat (dirname, SLASH_STRING, filename, (char *)NULL); 15675 else 15676 fullname = filename; 15677 15678 start_subfile (fullname, comp_dir); 15679 15680 if (fullname != filename) 15681 xfree (fullname); 15682 } 15683 15684 /* Start a symtab for DWARF. 15685 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */ 15686 15687 static void 15688 dwarf2_start_symtab (struct dwarf2_cu *cu, 15689 const char *name, const char *comp_dir, CORE_ADDR low_pc) 15690 { 15691 start_symtab (name, comp_dir, low_pc); 15692 record_debugformat ("DWARF 2"); 15693 record_producer (cu->producer); 15694 15695 /* We assume that we're processing GCC output. */ 15696 processing_gcc_compilation = 2; 15697 15698 cu->processing_has_namespace_info = 0; 15699 } 15700 15701 static void 15702 var_decode_location (struct attribute *attr, struct symbol *sym, 15703 struct dwarf2_cu *cu) 15704 { 15705 struct objfile *objfile = cu->objfile; 15706 struct comp_unit_head *cu_header = &cu->header; 15707 15708 /* NOTE drow/2003-01-30: There used to be a comment and some special 15709 code here to turn a symbol with DW_AT_external and a 15710 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was 15711 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux 15712 with some versions of binutils) where shared libraries could have 15713 relocations against symbols in their debug information - the 15714 minimal symbol would have the right address, but the debug info 15715 would not. It's no longer necessary, because we will explicitly 15716 apply relocations when we read in the debug information now. */ 15717 15718 /* A DW_AT_location attribute with no contents indicates that a 15719 variable has been optimized away. */ 15720 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0) 15721 { 15722 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT; 15723 return; 15724 } 15725 15726 /* Handle one degenerate form of location expression specially, to 15727 preserve GDB's previous behavior when section offsets are 15728 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index 15729 then mark this symbol as LOC_STATIC. */ 15730 15731 if (attr_form_is_block (attr) 15732 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr 15733 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size) 15734 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index 15735 && (DW_BLOCK (attr)->size 15736 == 1 + leb128_size (&DW_BLOCK (attr)->data[1]))))) 15737 { 15738 unsigned int dummy; 15739 15740 if (DW_BLOCK (attr)->data[0] == DW_OP_addr) 15741 SYMBOL_VALUE_ADDRESS (sym) = 15742 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy); 15743 else 15744 SYMBOL_VALUE_ADDRESS (sym) = 15745 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy); 15746 SYMBOL_CLASS (sym) = LOC_STATIC; 15747 fixup_symbol_section (sym, objfile); 15748 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets, 15749 SYMBOL_SECTION (sym)); 15750 return; 15751 } 15752 15753 /* NOTE drow/2002-01-30: It might be worthwhile to have a static 15754 expression evaluator, and use LOC_COMPUTED only when necessary 15755 (i.e. when the value of a register or memory location is 15756 referenced, or a thread-local block, etc.). Then again, it might 15757 not be worthwhile. I'm assuming that it isn't unless performance 15758 or memory numbers show me otherwise. */ 15759 15760 dwarf2_symbol_mark_computed (attr, sym, cu); 15761 SYMBOL_CLASS (sym) = LOC_COMPUTED; 15762 15763 if (SYMBOL_COMPUTED_OPS (sym) == &dwarf2_loclist_funcs) 15764 cu->has_loclist = 1; 15765 } 15766 15767 /* Given a pointer to a DWARF information entry, figure out if we need 15768 to make a symbol table entry for it, and if so, create a new entry 15769 and return a pointer to it. 15770 If TYPE is NULL, determine symbol type from the die, otherwise 15771 used the passed type. 15772 If SPACE is not NULL, use it to hold the new symbol. If it is 15773 NULL, allocate a new symbol on the objfile's obstack. */ 15774 15775 static struct symbol * 15776 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu, 15777 struct symbol *space) 15778 { 15779 struct objfile *objfile = cu->objfile; 15780 struct symbol *sym = NULL; 15781 const char *name; 15782 struct attribute *attr = NULL; 15783 struct attribute *attr2 = NULL; 15784 CORE_ADDR baseaddr; 15785 struct pending **list_to_add = NULL; 15786 15787 int inlined_func = (die->tag == DW_TAG_inlined_subroutine); 15788 15789 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 15790 15791 name = dwarf2_name (die, cu); 15792 if (name) 15793 { 15794 const char *linkagename; 15795 int suppress_add = 0; 15796 15797 if (space) 15798 sym = space; 15799 else 15800 sym = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symbol); 15801 OBJSTAT (objfile, n_syms++); 15802 15803 /* Cache this symbol's name and the name's demangled form (if any). */ 15804 SYMBOL_SET_LANGUAGE (sym, cu->language); 15805 linkagename = dwarf2_physname (name, die, cu); 15806 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile); 15807 15808 /* Fortran does not have mangling standard and the mangling does differ 15809 between gfortran, iFort etc. */ 15810 if (cu->language == language_fortran 15811 && symbol_get_demangled_name (&(sym->ginfo)) == NULL) 15812 symbol_set_demangled_name (&(sym->ginfo), 15813 dwarf2_full_name (name, die, cu), 15814 NULL); 15815 15816 /* Default assumptions. 15817 Use the passed type or decode it from the die. */ 15818 SYMBOL_DOMAIN (sym) = VAR_DOMAIN; 15819 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT; 15820 if (type != NULL) 15821 SYMBOL_TYPE (sym) = type; 15822 else 15823 SYMBOL_TYPE (sym) = die_type (die, cu); 15824 attr = dwarf2_attr (die, 15825 inlined_func ? DW_AT_call_line : DW_AT_decl_line, 15826 cu); 15827 if (attr) 15828 { 15829 SYMBOL_LINE (sym) = DW_UNSND (attr); 15830 } 15831 15832 attr = dwarf2_attr (die, 15833 inlined_func ? DW_AT_call_file : DW_AT_decl_file, 15834 cu); 15835 if (attr) 15836 { 15837 int file_index = DW_UNSND (attr); 15838 15839 if (cu->line_header == NULL 15840 || file_index > cu->line_header->num_file_names) 15841 complaint (&symfile_complaints, 15842 _("file index out of range")); 15843 else if (file_index > 0) 15844 { 15845 struct file_entry *fe; 15846 15847 fe = &cu->line_header->file_names[file_index - 1]; 15848 SYMBOL_SYMTAB (sym) = fe->symtab; 15849 } 15850 } 15851 15852 switch (die->tag) 15853 { 15854 case DW_TAG_label: 15855 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 15856 if (attr) 15857 { 15858 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr; 15859 } 15860 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr; 15861 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN; 15862 SYMBOL_CLASS (sym) = LOC_LABEL; 15863 add_symbol_to_list (sym, cu->list_in_scope); 15864 break; 15865 case DW_TAG_subprogram: 15866 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by 15867 finish_block. */ 15868 SYMBOL_CLASS (sym) = LOC_BLOCK; 15869 attr2 = dwarf2_attr (die, DW_AT_external, cu); 15870 if ((attr2 && (DW_UNSND (attr2) != 0)) 15871 || cu->language == language_ada) 15872 { 15873 /* Subprograms marked external are stored as a global symbol. 15874 Ada subprograms, whether marked external or not, are always 15875 stored as a global symbol, because we want to be able to 15876 access them globally. For instance, we want to be able 15877 to break on a nested subprogram without having to 15878 specify the context. */ 15879 list_to_add = &global_symbols; 15880 } 15881 else 15882 { 15883 list_to_add = cu->list_in_scope; 15884 } 15885 break; 15886 case DW_TAG_inlined_subroutine: 15887 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by 15888 finish_block. */ 15889 SYMBOL_CLASS (sym) = LOC_BLOCK; 15890 SYMBOL_INLINED (sym) = 1; 15891 list_to_add = cu->list_in_scope; 15892 break; 15893 case DW_TAG_template_value_param: 15894 suppress_add = 1; 15895 /* Fall through. */ 15896 case DW_TAG_constant: 15897 case DW_TAG_variable: 15898 case DW_TAG_member: 15899 /* Compilation with minimal debug info may result in 15900 variables with missing type entries. Change the 15901 misleading `void' type to something sensible. */ 15902 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID) 15903 SYMBOL_TYPE (sym) 15904 = objfile_type (objfile)->nodebug_data_symbol; 15905 15906 attr = dwarf2_attr (die, DW_AT_const_value, cu); 15907 /* In the case of DW_TAG_member, we should only be called for 15908 static const members. */ 15909 if (die->tag == DW_TAG_member) 15910 { 15911 /* dwarf2_add_field uses die_is_declaration, 15912 so we do the same. */ 15913 gdb_assert (die_is_declaration (die, cu)); 15914 gdb_assert (attr); 15915 } 15916 if (attr) 15917 { 15918 dwarf2_const_value (attr, sym, cu); 15919 attr2 = dwarf2_attr (die, DW_AT_external, cu); 15920 if (!suppress_add) 15921 { 15922 if (attr2 && (DW_UNSND (attr2) != 0)) 15923 list_to_add = &global_symbols; 15924 else 15925 list_to_add = cu->list_in_scope; 15926 } 15927 break; 15928 } 15929 attr = dwarf2_attr (die, DW_AT_location, cu); 15930 if (attr) 15931 { 15932 var_decode_location (attr, sym, cu); 15933 attr2 = dwarf2_attr (die, DW_AT_external, cu); 15934 15935 /* Fortran explicitly imports any global symbols to the local 15936 scope by DW_TAG_common_block. */ 15937 if (cu->language == language_fortran && die->parent 15938 && die->parent->tag == DW_TAG_common_block) 15939 attr2 = NULL; 15940 15941 if (SYMBOL_CLASS (sym) == LOC_STATIC 15942 && SYMBOL_VALUE_ADDRESS (sym) == 0 15943 && !dwarf2_per_objfile->has_section_at_zero) 15944 { 15945 /* When a static variable is eliminated by the linker, 15946 the corresponding debug information is not stripped 15947 out, but the variable address is set to null; 15948 do not add such variables into symbol table. */ 15949 } 15950 else if (attr2 && (DW_UNSND (attr2) != 0)) 15951 { 15952 /* Workaround gfortran PR debug/40040 - it uses 15953 DW_AT_location for variables in -fPIC libraries which may 15954 get overriden by other libraries/executable and get 15955 a different address. Resolve it by the minimal symbol 15956 which may come from inferior's executable using copy 15957 relocation. Make this workaround only for gfortran as for 15958 other compilers GDB cannot guess the minimal symbol 15959 Fortran mangling kind. */ 15960 if (cu->language == language_fortran && die->parent 15961 && die->parent->tag == DW_TAG_module 15962 && cu->producer 15963 && strncmp (cu->producer, "GNU Fortran ", 12) == 0) 15964 SYMBOL_CLASS (sym) = LOC_UNRESOLVED; 15965 15966 /* A variable with DW_AT_external is never static, 15967 but it may be block-scoped. */ 15968 list_to_add = (cu->list_in_scope == &file_symbols 15969 ? &global_symbols : cu->list_in_scope); 15970 } 15971 else 15972 list_to_add = cu->list_in_scope; 15973 } 15974 else 15975 { 15976 /* We do not know the address of this symbol. 15977 If it is an external symbol and we have type information 15978 for it, enter the symbol as a LOC_UNRESOLVED symbol. 15979 The address of the variable will then be determined from 15980 the minimal symbol table whenever the variable is 15981 referenced. */ 15982 attr2 = dwarf2_attr (die, DW_AT_external, cu); 15983 15984 /* Fortran explicitly imports any global symbols to the local 15985 scope by DW_TAG_common_block. */ 15986 if (cu->language == language_fortran && die->parent 15987 && die->parent->tag == DW_TAG_common_block) 15988 { 15989 /* SYMBOL_CLASS doesn't matter here because 15990 read_common_block is going to reset it. */ 15991 if (!suppress_add) 15992 list_to_add = cu->list_in_scope; 15993 } 15994 else if (attr2 && (DW_UNSND (attr2) != 0) 15995 && dwarf2_attr (die, DW_AT_type, cu) != NULL) 15996 { 15997 /* A variable with DW_AT_external is never static, but it 15998 may be block-scoped. */ 15999 list_to_add = (cu->list_in_scope == &file_symbols 16000 ? &global_symbols : cu->list_in_scope); 16001 16002 SYMBOL_CLASS (sym) = LOC_UNRESOLVED; 16003 } 16004 else if (!die_is_declaration (die, cu)) 16005 { 16006 /* Use the default LOC_OPTIMIZED_OUT class. */ 16007 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT); 16008 if (!suppress_add) 16009 list_to_add = cu->list_in_scope; 16010 } 16011 } 16012 break; 16013 case DW_TAG_formal_parameter: 16014 /* If we are inside a function, mark this as an argument. If 16015 not, we might be looking at an argument to an inlined function 16016 when we do not have enough information to show inlined frames; 16017 pretend it's a local variable in that case so that the user can 16018 still see it. */ 16019 if (context_stack_depth > 0 16020 && context_stack[context_stack_depth - 1].name != NULL) 16021 SYMBOL_IS_ARGUMENT (sym) = 1; 16022 attr = dwarf2_attr (die, DW_AT_location, cu); 16023 if (attr) 16024 { 16025 var_decode_location (attr, sym, cu); 16026 } 16027 attr = dwarf2_attr (die, DW_AT_const_value, cu); 16028 if (attr) 16029 { 16030 dwarf2_const_value (attr, sym, cu); 16031 } 16032 16033 list_to_add = cu->list_in_scope; 16034 break; 16035 case DW_TAG_unspecified_parameters: 16036 /* From varargs functions; gdb doesn't seem to have any 16037 interest in this information, so just ignore it for now. 16038 (FIXME?) */ 16039 break; 16040 case DW_TAG_template_type_param: 16041 suppress_add = 1; 16042 /* Fall through. */ 16043 case DW_TAG_class_type: 16044 case DW_TAG_interface_type: 16045 case DW_TAG_structure_type: 16046 case DW_TAG_union_type: 16047 case DW_TAG_set_type: 16048 case DW_TAG_enumeration_type: 16049 SYMBOL_CLASS (sym) = LOC_TYPEDEF; 16050 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; 16051 16052 { 16053 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't 16054 really ever be static objects: otherwise, if you try 16055 to, say, break of a class's method and you're in a file 16056 which doesn't mention that class, it won't work unless 16057 the check for all static symbols in lookup_symbol_aux 16058 saves you. See the OtherFileClass tests in 16059 gdb.c++/namespace.exp. */ 16060 16061 if (!suppress_add) 16062 { 16063 list_to_add = (cu->list_in_scope == &file_symbols 16064 && (cu->language == language_cplus 16065 || cu->language == language_java) 16066 ? &global_symbols : cu->list_in_scope); 16067 16068 /* The semantics of C++ state that "struct foo { 16069 ... }" also defines a typedef for "foo". A Java 16070 class declaration also defines a typedef for the 16071 class. */ 16072 if (cu->language == language_cplus 16073 || cu->language == language_java 16074 || cu->language == language_ada) 16075 { 16076 /* The symbol's name is already allocated along 16077 with this objfile, so we don't need to 16078 duplicate it for the type. */ 16079 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0) 16080 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym); 16081 } 16082 } 16083 } 16084 break; 16085 case DW_TAG_typedef: 16086 SYMBOL_CLASS (sym) = LOC_TYPEDEF; 16087 SYMBOL_DOMAIN (sym) = VAR_DOMAIN; 16088 list_to_add = cu->list_in_scope; 16089 break; 16090 case DW_TAG_base_type: 16091 case DW_TAG_subrange_type: 16092 SYMBOL_CLASS (sym) = LOC_TYPEDEF; 16093 SYMBOL_DOMAIN (sym) = VAR_DOMAIN; 16094 list_to_add = cu->list_in_scope; 16095 break; 16096 case DW_TAG_enumerator: 16097 attr = dwarf2_attr (die, DW_AT_const_value, cu); 16098 if (attr) 16099 { 16100 dwarf2_const_value (attr, sym, cu); 16101 } 16102 { 16103 /* NOTE: carlton/2003-11-10: See comment above in the 16104 DW_TAG_class_type, etc. block. */ 16105 16106 list_to_add = (cu->list_in_scope == &file_symbols 16107 && (cu->language == language_cplus 16108 || cu->language == language_java) 16109 ? &global_symbols : cu->list_in_scope); 16110 } 16111 break; 16112 case DW_TAG_namespace: 16113 SYMBOL_CLASS (sym) = LOC_TYPEDEF; 16114 list_to_add = &global_symbols; 16115 break; 16116 case DW_TAG_common_block: 16117 SYMBOL_CLASS (sym) = LOC_COMMON_BLOCK; 16118 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN; 16119 add_symbol_to_list (sym, cu->list_in_scope); 16120 break; 16121 default: 16122 /* Not a tag we recognize. Hopefully we aren't processing 16123 trash data, but since we must specifically ignore things 16124 we don't recognize, there is nothing else we should do at 16125 this point. */ 16126 complaint (&symfile_complaints, _("unsupported tag: '%s'"), 16127 dwarf_tag_name (die->tag)); 16128 break; 16129 } 16130 16131 if (suppress_add) 16132 { 16133 sym->hash_next = objfile->template_symbols; 16134 objfile->template_symbols = sym; 16135 list_to_add = NULL; 16136 } 16137 16138 if (list_to_add != NULL) 16139 add_symbol_to_list (sym, list_to_add); 16140 16141 /* For the benefit of old versions of GCC, check for anonymous 16142 namespaces based on the demangled name. */ 16143 if (!cu->processing_has_namespace_info 16144 && cu->language == language_cplus) 16145 cp_scan_for_anonymous_namespaces (sym, objfile); 16146 } 16147 return (sym); 16148 } 16149 16150 /* A wrapper for new_symbol_full that always allocates a new symbol. */ 16151 16152 static struct symbol * 16153 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu) 16154 { 16155 return new_symbol_full (die, type, cu, NULL); 16156 } 16157 16158 /* Given an attr with a DW_FORM_dataN value in host byte order, 16159 zero-extend it as appropriate for the symbol's type. The DWARF 16160 standard (v4) is not entirely clear about the meaning of using 16161 DW_FORM_dataN for a constant with a signed type, where the type is 16162 wider than the data. The conclusion of a discussion on the DWARF 16163 list was that this is unspecified. We choose to always zero-extend 16164 because that is the interpretation long in use by GCC. */ 16165 16166 static gdb_byte * 16167 dwarf2_const_value_data (struct attribute *attr, struct type *type, 16168 const char *name, struct obstack *obstack, 16169 struct dwarf2_cu *cu, LONGEST *value, int bits) 16170 { 16171 struct objfile *objfile = cu->objfile; 16172 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ? 16173 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE; 16174 LONGEST l = DW_UNSND (attr); 16175 16176 if (bits < sizeof (*value) * 8) 16177 { 16178 l &= ((LONGEST) 1 << bits) - 1; 16179 *value = l; 16180 } 16181 else if (bits == sizeof (*value) * 8) 16182 *value = l; 16183 else 16184 { 16185 gdb_byte *bytes = obstack_alloc (obstack, bits / 8); 16186 store_unsigned_integer (bytes, bits / 8, byte_order, l); 16187 return bytes; 16188 } 16189 16190 return NULL; 16191 } 16192 16193 /* Read a constant value from an attribute. Either set *VALUE, or if 16194 the value does not fit in *VALUE, set *BYTES - either already 16195 allocated on the objfile obstack, or newly allocated on OBSTACK, 16196 or, set *BATON, if we translated the constant to a location 16197 expression. */ 16198 16199 static void 16200 dwarf2_const_value_attr (struct attribute *attr, struct type *type, 16201 const char *name, struct obstack *obstack, 16202 struct dwarf2_cu *cu, 16203 LONGEST *value, gdb_byte **bytes, 16204 struct dwarf2_locexpr_baton **baton) 16205 { 16206 struct objfile *objfile = cu->objfile; 16207 struct comp_unit_head *cu_header = &cu->header; 16208 struct dwarf_block *blk; 16209 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ? 16210 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE); 16211 16212 *value = 0; 16213 *bytes = NULL; 16214 *baton = NULL; 16215 16216 switch (attr->form) 16217 { 16218 case DW_FORM_addr: 16219 case DW_FORM_GNU_addr_index: 16220 { 16221 gdb_byte *data; 16222 16223 if (TYPE_LENGTH (type) != cu_header->addr_size) 16224 dwarf2_const_value_length_mismatch_complaint (name, 16225 cu_header->addr_size, 16226 TYPE_LENGTH (type)); 16227 /* Symbols of this form are reasonably rare, so we just 16228 piggyback on the existing location code rather than writing 16229 a new implementation of symbol_computed_ops. */ 16230 *baton = obstack_alloc (&objfile->objfile_obstack, 16231 sizeof (struct dwarf2_locexpr_baton)); 16232 (*baton)->per_cu = cu->per_cu; 16233 gdb_assert ((*baton)->per_cu); 16234 16235 (*baton)->size = 2 + cu_header->addr_size; 16236 data = obstack_alloc (&objfile->objfile_obstack, (*baton)->size); 16237 (*baton)->data = data; 16238 16239 data[0] = DW_OP_addr; 16240 store_unsigned_integer (&data[1], cu_header->addr_size, 16241 byte_order, DW_ADDR (attr)); 16242 data[cu_header->addr_size + 1] = DW_OP_stack_value; 16243 } 16244 break; 16245 case DW_FORM_string: 16246 case DW_FORM_strp: 16247 case DW_FORM_GNU_str_index: 16248 case DW_FORM_GNU_strp_alt: 16249 /* DW_STRING is already allocated on the objfile obstack, point 16250 directly to it. */ 16251 *bytes = (gdb_byte *) DW_STRING (attr); 16252 break; 16253 case DW_FORM_block1: 16254 case DW_FORM_block2: 16255 case DW_FORM_block4: 16256 case DW_FORM_block: 16257 case DW_FORM_exprloc: 16258 blk = DW_BLOCK (attr); 16259 if (TYPE_LENGTH (type) != blk->size) 16260 dwarf2_const_value_length_mismatch_complaint (name, blk->size, 16261 TYPE_LENGTH (type)); 16262 *bytes = blk->data; 16263 break; 16264 16265 /* The DW_AT_const_value attributes are supposed to carry the 16266 symbol's value "represented as it would be on the target 16267 architecture." By the time we get here, it's already been 16268 converted to host endianness, so we just need to sign- or 16269 zero-extend it as appropriate. */ 16270 case DW_FORM_data1: 16271 *bytes = dwarf2_const_value_data (attr, type, name, 16272 obstack, cu, value, 8); 16273 break; 16274 case DW_FORM_data2: 16275 *bytes = dwarf2_const_value_data (attr, type, name, 16276 obstack, cu, value, 16); 16277 break; 16278 case DW_FORM_data4: 16279 *bytes = dwarf2_const_value_data (attr, type, name, 16280 obstack, cu, value, 32); 16281 break; 16282 case DW_FORM_data8: 16283 *bytes = dwarf2_const_value_data (attr, type, name, 16284 obstack, cu, value, 64); 16285 break; 16286 16287 case DW_FORM_sdata: 16288 *value = DW_SND (attr); 16289 break; 16290 16291 case DW_FORM_udata: 16292 *value = DW_UNSND (attr); 16293 break; 16294 16295 default: 16296 complaint (&symfile_complaints, 16297 _("unsupported const value attribute form: '%s'"), 16298 dwarf_form_name (attr->form)); 16299 *value = 0; 16300 break; 16301 } 16302 } 16303 16304 16305 /* Copy constant value from an attribute to a symbol. */ 16306 16307 static void 16308 dwarf2_const_value (struct attribute *attr, struct symbol *sym, 16309 struct dwarf2_cu *cu) 16310 { 16311 struct objfile *objfile = cu->objfile; 16312 struct comp_unit_head *cu_header = &cu->header; 16313 LONGEST value; 16314 gdb_byte *bytes; 16315 struct dwarf2_locexpr_baton *baton; 16316 16317 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym), 16318 SYMBOL_PRINT_NAME (sym), 16319 &objfile->objfile_obstack, cu, 16320 &value, &bytes, &baton); 16321 16322 if (baton != NULL) 16323 { 16324 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs; 16325 SYMBOL_LOCATION_BATON (sym) = baton; 16326 SYMBOL_CLASS (sym) = LOC_COMPUTED; 16327 } 16328 else if (bytes != NULL) 16329 { 16330 SYMBOL_VALUE_BYTES (sym) = bytes; 16331 SYMBOL_CLASS (sym) = LOC_CONST_BYTES; 16332 } 16333 else 16334 { 16335 SYMBOL_VALUE (sym) = value; 16336 SYMBOL_CLASS (sym) = LOC_CONST; 16337 } 16338 } 16339 16340 /* Return the type of the die in question using its DW_AT_type attribute. */ 16341 16342 static struct type * 16343 die_type (struct die_info *die, struct dwarf2_cu *cu) 16344 { 16345 struct attribute *type_attr; 16346 16347 type_attr = dwarf2_attr (die, DW_AT_type, cu); 16348 if (!type_attr) 16349 { 16350 /* A missing DW_AT_type represents a void type. */ 16351 return objfile_type (cu->objfile)->builtin_void; 16352 } 16353 16354 return lookup_die_type (die, type_attr, cu); 16355 } 16356 16357 /* True iff CU's producer generates GNAT Ada auxiliary information 16358 that allows to find parallel types through that information instead 16359 of having to do expensive parallel lookups by type name. */ 16360 16361 static int 16362 need_gnat_info (struct dwarf2_cu *cu) 16363 { 16364 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version 16365 of GNAT produces this auxiliary information, without any indication 16366 that it is produced. Part of enhancing the FSF version of GNAT 16367 to produce that information will be to put in place an indicator 16368 that we can use in order to determine whether the descriptive type 16369 info is available or not. One suggestion that has been made is 16370 to use a new attribute, attached to the CU die. For now, assume 16371 that the descriptive type info is not available. */ 16372 return 0; 16373 } 16374 16375 /* Return the auxiliary type of the die in question using its 16376 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the 16377 attribute is not present. */ 16378 16379 static struct type * 16380 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu) 16381 { 16382 struct attribute *type_attr; 16383 16384 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu); 16385 if (!type_attr) 16386 return NULL; 16387 16388 return lookup_die_type (die, type_attr, cu); 16389 } 16390 16391 /* If DIE has a descriptive_type attribute, then set the TYPE's 16392 descriptive type accordingly. */ 16393 16394 static void 16395 set_descriptive_type (struct type *type, struct die_info *die, 16396 struct dwarf2_cu *cu) 16397 { 16398 struct type *descriptive_type = die_descriptive_type (die, cu); 16399 16400 if (descriptive_type) 16401 { 16402 ALLOCATE_GNAT_AUX_TYPE (type); 16403 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type; 16404 } 16405 } 16406 16407 /* Return the containing type of the die in question using its 16408 DW_AT_containing_type attribute. */ 16409 16410 static struct type * 16411 die_containing_type (struct die_info *die, struct dwarf2_cu *cu) 16412 { 16413 struct attribute *type_attr; 16414 16415 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu); 16416 if (!type_attr) 16417 error (_("Dwarf Error: Problem turning containing type into gdb type " 16418 "[in module %s]"), cu->objfile->name); 16419 16420 return lookup_die_type (die, type_attr, cu); 16421 } 16422 16423 /* Look up the type of DIE in CU using its type attribute ATTR. 16424 If there is no type substitute an error marker. */ 16425 16426 static struct type * 16427 lookup_die_type (struct die_info *die, struct attribute *attr, 16428 struct dwarf2_cu *cu) 16429 { 16430 struct objfile *objfile = cu->objfile; 16431 struct type *this_type; 16432 16433 /* First see if we have it cached. */ 16434 16435 if (attr->form == DW_FORM_GNU_ref_alt) 16436 { 16437 struct dwarf2_per_cu_data *per_cu; 16438 sect_offset offset = dwarf2_get_ref_die_offset (attr); 16439 16440 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile); 16441 this_type = get_die_type_at_offset (offset, per_cu); 16442 } 16443 else if (is_ref_attr (attr)) 16444 { 16445 sect_offset offset = dwarf2_get_ref_die_offset (attr); 16446 16447 this_type = get_die_type_at_offset (offset, cu->per_cu); 16448 } 16449 else if (attr->form == DW_FORM_ref_sig8) 16450 { 16451 struct signatured_type *sig_type = DW_SIGNATURED_TYPE (attr); 16452 16453 /* sig_type will be NULL if the signatured type is missing from 16454 the debug info. */ 16455 if (sig_type == NULL) 16456 error (_("Dwarf Error: Cannot find signatured DIE referenced from DIE " 16457 "at 0x%x [in module %s]"), 16458 die->offset.sect_off, objfile->name); 16459 16460 gdb_assert (sig_type->per_cu.is_debug_types); 16461 /* If we haven't filled in type_offset_in_section yet, then we 16462 haven't read the type in yet. */ 16463 this_type = NULL; 16464 if (sig_type->type_offset_in_section.sect_off != 0) 16465 { 16466 this_type = 16467 get_die_type_at_offset (sig_type->type_offset_in_section, 16468 &sig_type->per_cu); 16469 } 16470 } 16471 else 16472 { 16473 dump_die_for_error (die); 16474 error (_("Dwarf Error: Bad type attribute %s [in module %s]"), 16475 dwarf_attr_name (attr->name), objfile->name); 16476 } 16477 16478 /* If not cached we need to read it in. */ 16479 16480 if (this_type == NULL) 16481 { 16482 struct die_info *type_die; 16483 struct dwarf2_cu *type_cu = cu; 16484 16485 type_die = follow_die_ref_or_sig (die, attr, &type_cu); 16486 /* If we found the type now, it's probably because the type came 16487 from an inter-CU reference and the type's CU got expanded before 16488 ours. */ 16489 this_type = get_die_type (type_die, type_cu); 16490 if (this_type == NULL) 16491 this_type = read_type_die_1 (type_die, type_cu); 16492 } 16493 16494 /* If we still don't have a type use an error marker. */ 16495 16496 if (this_type == NULL) 16497 { 16498 char *message, *saved; 16499 16500 /* read_type_die already issued a complaint. */ 16501 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"), 16502 objfile->name, 16503 cu->header.offset.sect_off, 16504 die->offset.sect_off); 16505 saved = obstack_copy0 (&objfile->objfile_obstack, 16506 message, strlen (message)); 16507 xfree (message); 16508 16509 this_type = init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile); 16510 } 16511 16512 return this_type; 16513 } 16514 16515 /* Return the type in DIE, CU. 16516 Returns NULL for invalid types. 16517 16518 This first does a lookup in the appropriate type_hash table, 16519 and only reads the die in if necessary. 16520 16521 NOTE: This can be called when reading in partial or full symbols. */ 16522 16523 static struct type * 16524 read_type_die (struct die_info *die, struct dwarf2_cu *cu) 16525 { 16526 struct type *this_type; 16527 16528 this_type = get_die_type (die, cu); 16529 if (this_type) 16530 return this_type; 16531 16532 return read_type_die_1 (die, cu); 16533 } 16534 16535 /* Read the type in DIE, CU. 16536 Returns NULL for invalid types. */ 16537 16538 static struct type * 16539 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu) 16540 { 16541 struct type *this_type = NULL; 16542 16543 switch (die->tag) 16544 { 16545 case DW_TAG_class_type: 16546 case DW_TAG_interface_type: 16547 case DW_TAG_structure_type: 16548 case DW_TAG_union_type: 16549 this_type = read_structure_type (die, cu); 16550 break; 16551 case DW_TAG_enumeration_type: 16552 this_type = read_enumeration_type (die, cu); 16553 break; 16554 case DW_TAG_subprogram: 16555 case DW_TAG_subroutine_type: 16556 case DW_TAG_inlined_subroutine: 16557 this_type = read_subroutine_type (die, cu); 16558 break; 16559 case DW_TAG_array_type: 16560 this_type = read_array_type (die, cu); 16561 break; 16562 case DW_TAG_set_type: 16563 this_type = read_set_type (die, cu); 16564 break; 16565 case DW_TAG_pointer_type: 16566 this_type = read_tag_pointer_type (die, cu); 16567 break; 16568 case DW_TAG_ptr_to_member_type: 16569 this_type = read_tag_ptr_to_member_type (die, cu); 16570 break; 16571 case DW_TAG_reference_type: 16572 this_type = read_tag_reference_type (die, cu); 16573 break; 16574 case DW_TAG_const_type: 16575 this_type = read_tag_const_type (die, cu); 16576 break; 16577 case DW_TAG_volatile_type: 16578 this_type = read_tag_volatile_type (die, cu); 16579 break; 16580 case DW_TAG_restrict_type: 16581 this_type = read_tag_restrict_type (die, cu); 16582 break; 16583 case DW_TAG_string_type: 16584 this_type = read_tag_string_type (die, cu); 16585 break; 16586 case DW_TAG_typedef: 16587 this_type = read_typedef (die, cu); 16588 break; 16589 case DW_TAG_subrange_type: 16590 this_type = read_subrange_type (die, cu); 16591 break; 16592 case DW_TAG_base_type: 16593 this_type = read_base_type (die, cu); 16594 break; 16595 case DW_TAG_unspecified_type: 16596 this_type = read_unspecified_type (die, cu); 16597 break; 16598 case DW_TAG_namespace: 16599 this_type = read_namespace_type (die, cu); 16600 break; 16601 case DW_TAG_module: 16602 this_type = read_module_type (die, cu); 16603 break; 16604 default: 16605 complaint (&symfile_complaints, 16606 _("unexpected tag in read_type_die: '%s'"), 16607 dwarf_tag_name (die->tag)); 16608 break; 16609 } 16610 16611 return this_type; 16612 } 16613 16614 /* See if we can figure out if the class lives in a namespace. We do 16615 this by looking for a member function; its demangled name will 16616 contain namespace info, if there is any. 16617 Return the computed name or NULL. 16618 Space for the result is allocated on the objfile's obstack. 16619 This is the full-die version of guess_partial_die_structure_name. 16620 In this case we know DIE has no useful parent. */ 16621 16622 static char * 16623 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu) 16624 { 16625 struct die_info *spec_die; 16626 struct dwarf2_cu *spec_cu; 16627 struct die_info *child; 16628 16629 spec_cu = cu; 16630 spec_die = die_specification (die, &spec_cu); 16631 if (spec_die != NULL) 16632 { 16633 die = spec_die; 16634 cu = spec_cu; 16635 } 16636 16637 for (child = die->child; 16638 child != NULL; 16639 child = child->sibling) 16640 { 16641 if (child->tag == DW_TAG_subprogram) 16642 { 16643 struct attribute *attr; 16644 16645 attr = dwarf2_attr (child, DW_AT_linkage_name, cu); 16646 if (attr == NULL) 16647 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu); 16648 if (attr != NULL) 16649 { 16650 char *actual_name 16651 = language_class_name_from_physname (cu->language_defn, 16652 DW_STRING (attr)); 16653 char *name = NULL; 16654 16655 if (actual_name != NULL) 16656 { 16657 const char *die_name = dwarf2_name (die, cu); 16658 16659 if (die_name != NULL 16660 && strcmp (die_name, actual_name) != 0) 16661 { 16662 /* Strip off the class name from the full name. 16663 We want the prefix. */ 16664 int die_name_len = strlen (die_name); 16665 int actual_name_len = strlen (actual_name); 16666 16667 /* Test for '::' as a sanity check. */ 16668 if (actual_name_len > die_name_len + 2 16669 && actual_name[actual_name_len 16670 - die_name_len - 1] == ':') 16671 name = 16672 obstack_copy0 (&cu->objfile->objfile_obstack, 16673 actual_name, 16674 actual_name_len - die_name_len - 2); 16675 } 16676 } 16677 xfree (actual_name); 16678 return name; 16679 } 16680 } 16681 } 16682 16683 return NULL; 16684 } 16685 16686 /* GCC might emit a nameless typedef that has a linkage name. Determine the 16687 prefix part in such case. See 16688 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ 16689 16690 static char * 16691 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu) 16692 { 16693 struct attribute *attr; 16694 char *base; 16695 16696 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type 16697 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type) 16698 return NULL; 16699 16700 attr = dwarf2_attr (die, DW_AT_name, cu); 16701 if (attr != NULL && DW_STRING (attr) != NULL) 16702 return NULL; 16703 16704 attr = dwarf2_attr (die, DW_AT_linkage_name, cu); 16705 if (attr == NULL) 16706 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); 16707 if (attr == NULL || DW_STRING (attr) == NULL) 16708 return NULL; 16709 16710 /* dwarf2_name had to be already called. */ 16711 gdb_assert (DW_STRING_IS_CANONICAL (attr)); 16712 16713 /* Strip the base name, keep any leading namespaces/classes. */ 16714 base = strrchr (DW_STRING (attr), ':'); 16715 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':') 16716 return ""; 16717 16718 return obstack_copy0 (&cu->objfile->objfile_obstack, 16719 DW_STRING (attr), &base[-1] - DW_STRING (attr)); 16720 } 16721 16722 /* Return the name of the namespace/class that DIE is defined within, 16723 or "" if we can't tell. The caller should not xfree the result. 16724 16725 For example, if we're within the method foo() in the following 16726 code: 16727 16728 namespace N { 16729 class C { 16730 void foo () { 16731 } 16732 }; 16733 } 16734 16735 then determine_prefix on foo's die will return "N::C". */ 16736 16737 static const char * 16738 determine_prefix (struct die_info *die, struct dwarf2_cu *cu) 16739 { 16740 struct die_info *parent, *spec_die; 16741 struct dwarf2_cu *spec_cu; 16742 struct type *parent_type; 16743 char *retval; 16744 16745 if (cu->language != language_cplus && cu->language != language_java 16746 && cu->language != language_fortran) 16747 return ""; 16748 16749 retval = anonymous_struct_prefix (die, cu); 16750 if (retval) 16751 return retval; 16752 16753 /* We have to be careful in the presence of DW_AT_specification. 16754 For example, with GCC 3.4, given the code 16755 16756 namespace N { 16757 void foo() { 16758 // Definition of N::foo. 16759 } 16760 } 16761 16762 then we'll have a tree of DIEs like this: 16763 16764 1: DW_TAG_compile_unit 16765 2: DW_TAG_namespace // N 16766 3: DW_TAG_subprogram // declaration of N::foo 16767 4: DW_TAG_subprogram // definition of N::foo 16768 DW_AT_specification // refers to die #3 16769 16770 Thus, when processing die #4, we have to pretend that we're in 16771 the context of its DW_AT_specification, namely the contex of die 16772 #3. */ 16773 spec_cu = cu; 16774 spec_die = die_specification (die, &spec_cu); 16775 if (spec_die == NULL) 16776 parent = die->parent; 16777 else 16778 { 16779 parent = spec_die->parent; 16780 cu = spec_cu; 16781 } 16782 16783 if (parent == NULL) 16784 return ""; 16785 else if (parent->building_fullname) 16786 { 16787 const char *name; 16788 const char *parent_name; 16789 16790 /* It has been seen on RealView 2.2 built binaries, 16791 DW_TAG_template_type_param types actually _defined_ as 16792 children of the parent class: 16793 16794 enum E {}; 16795 template class <class Enum> Class{}; 16796 Class<enum E> class_e; 16797 16798 1: DW_TAG_class_type (Class) 16799 2: DW_TAG_enumeration_type (E) 16800 3: DW_TAG_enumerator (enum1:0) 16801 3: DW_TAG_enumerator (enum2:1) 16802 ... 16803 2: DW_TAG_template_type_param 16804 DW_AT_type DW_FORM_ref_udata (E) 16805 16806 Besides being broken debug info, it can put GDB into an 16807 infinite loop. Consider: 16808 16809 When we're building the full name for Class<E>, we'll start 16810 at Class, and go look over its template type parameters, 16811 finding E. We'll then try to build the full name of E, and 16812 reach here. We're now trying to build the full name of E, 16813 and look over the parent DIE for containing scope. In the 16814 broken case, if we followed the parent DIE of E, we'd again 16815 find Class, and once again go look at its template type 16816 arguments, etc., etc. Simply don't consider such parent die 16817 as source-level parent of this die (it can't be, the language 16818 doesn't allow it), and break the loop here. */ 16819 name = dwarf2_name (die, cu); 16820 parent_name = dwarf2_name (parent, cu); 16821 complaint (&symfile_complaints, 16822 _("template param type '%s' defined within parent '%s'"), 16823 name ? name : "<unknown>", 16824 parent_name ? parent_name : "<unknown>"); 16825 return ""; 16826 } 16827 else 16828 switch (parent->tag) 16829 { 16830 case DW_TAG_namespace: 16831 parent_type = read_type_die (parent, cu); 16832 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus 16833 DW_TAG_namespace DIEs with a name of "::" for the global namespace. 16834 Work around this problem here. */ 16835 if (cu->language == language_cplus 16836 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0) 16837 return ""; 16838 /* We give a name to even anonymous namespaces. */ 16839 return TYPE_TAG_NAME (parent_type); 16840 case DW_TAG_class_type: 16841 case DW_TAG_interface_type: 16842 case DW_TAG_structure_type: 16843 case DW_TAG_union_type: 16844 case DW_TAG_module: 16845 parent_type = read_type_die (parent, cu); 16846 if (TYPE_TAG_NAME (parent_type) != NULL) 16847 return TYPE_TAG_NAME (parent_type); 16848 else 16849 /* An anonymous structure is only allowed non-static data 16850 members; no typedefs, no member functions, et cetera. 16851 So it does not need a prefix. */ 16852 return ""; 16853 case DW_TAG_compile_unit: 16854 case DW_TAG_partial_unit: 16855 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */ 16856 if (cu->language == language_cplus 16857 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types) 16858 && die->child != NULL 16859 && (die->tag == DW_TAG_class_type 16860 || die->tag == DW_TAG_structure_type 16861 || die->tag == DW_TAG_union_type)) 16862 { 16863 char *name = guess_full_die_structure_name (die, cu); 16864 if (name != NULL) 16865 return name; 16866 } 16867 return ""; 16868 default: 16869 return determine_prefix (parent, cu); 16870 } 16871 } 16872 16873 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX 16874 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then 16875 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform 16876 an obconcat, otherwise allocate storage for the result. The CU argument is 16877 used to determine the language and hence, the appropriate separator. */ 16878 16879 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */ 16880 16881 static char * 16882 typename_concat (struct obstack *obs, const char *prefix, const char *suffix, 16883 int physname, struct dwarf2_cu *cu) 16884 { 16885 const char *lead = ""; 16886 const char *sep; 16887 16888 if (suffix == NULL || suffix[0] == '\0' 16889 || prefix == NULL || prefix[0] == '\0') 16890 sep = ""; 16891 else if (cu->language == language_java) 16892 sep = "."; 16893 else if (cu->language == language_fortran && physname) 16894 { 16895 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or 16896 DW_AT_MIPS_linkage_name is preferred and used instead. */ 16897 16898 lead = "__"; 16899 sep = "_MOD_"; 16900 } 16901 else 16902 sep = "::"; 16903 16904 if (prefix == NULL) 16905 prefix = ""; 16906 if (suffix == NULL) 16907 suffix = ""; 16908 16909 if (obs == NULL) 16910 { 16911 char *retval 16912 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1); 16913 16914 strcpy (retval, lead); 16915 strcat (retval, prefix); 16916 strcat (retval, sep); 16917 strcat (retval, suffix); 16918 return retval; 16919 } 16920 else 16921 { 16922 /* We have an obstack. */ 16923 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL); 16924 } 16925 } 16926 16927 /* Return sibling of die, NULL if no sibling. */ 16928 16929 static struct die_info * 16930 sibling_die (struct die_info *die) 16931 { 16932 return die->sibling; 16933 } 16934 16935 /* Get name of a die, return NULL if not found. */ 16936 16937 static const char * 16938 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu, 16939 struct obstack *obstack) 16940 { 16941 if (name && cu->language == language_cplus) 16942 { 16943 char *canon_name = cp_canonicalize_string (name); 16944 16945 if (canon_name != NULL) 16946 { 16947 if (strcmp (canon_name, name) != 0) 16948 name = obstack_copy0 (obstack, canon_name, strlen (canon_name)); 16949 xfree (canon_name); 16950 } 16951 } 16952 16953 return name; 16954 } 16955 16956 /* Get name of a die, return NULL if not found. */ 16957 16958 static const char * 16959 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu) 16960 { 16961 struct attribute *attr; 16962 16963 attr = dwarf2_attr (die, DW_AT_name, cu); 16964 if ((!attr || !DW_STRING (attr)) 16965 && die->tag != DW_TAG_class_type 16966 && die->tag != DW_TAG_interface_type 16967 && die->tag != DW_TAG_structure_type 16968 && die->tag != DW_TAG_union_type) 16969 return NULL; 16970 16971 switch (die->tag) 16972 { 16973 case DW_TAG_compile_unit: 16974 case DW_TAG_partial_unit: 16975 /* Compilation units have a DW_AT_name that is a filename, not 16976 a source language identifier. */ 16977 case DW_TAG_enumeration_type: 16978 case DW_TAG_enumerator: 16979 /* These tags always have simple identifiers already; no need 16980 to canonicalize them. */ 16981 return DW_STRING (attr); 16982 16983 case DW_TAG_subprogram: 16984 /* Java constructors will all be named "<init>", so return 16985 the class name when we see this special case. */ 16986 if (cu->language == language_java 16987 && DW_STRING (attr) != NULL 16988 && strcmp (DW_STRING (attr), "<init>") == 0) 16989 { 16990 struct dwarf2_cu *spec_cu = cu; 16991 struct die_info *spec_die; 16992 16993 /* GCJ will output '<init>' for Java constructor names. 16994 For this special case, return the name of the parent class. */ 16995 16996 /* GCJ may output suprogram DIEs with AT_specification set. 16997 If so, use the name of the specified DIE. */ 16998 spec_die = die_specification (die, &spec_cu); 16999 if (spec_die != NULL) 17000 return dwarf2_name (spec_die, spec_cu); 17001 17002 do 17003 { 17004 die = die->parent; 17005 if (die->tag == DW_TAG_class_type) 17006 return dwarf2_name (die, cu); 17007 } 17008 while (die->tag != DW_TAG_compile_unit 17009 && die->tag != DW_TAG_partial_unit); 17010 } 17011 break; 17012 17013 case DW_TAG_class_type: 17014 case DW_TAG_interface_type: 17015 case DW_TAG_structure_type: 17016 case DW_TAG_union_type: 17017 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed 17018 structures or unions. These were of the form "._%d" in GCC 4.1, 17019 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3 17020 and GCC 4.4. We work around this problem by ignoring these. */ 17021 if (attr && DW_STRING (attr) 17022 && (strncmp (DW_STRING (attr), "._", 2) == 0 17023 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0)) 17024 return NULL; 17025 17026 /* GCC might emit a nameless typedef that has a linkage name. See 17027 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ 17028 if (!attr || DW_STRING (attr) == NULL) 17029 { 17030 char *demangled = NULL; 17031 17032 attr = dwarf2_attr (die, DW_AT_linkage_name, cu); 17033 if (attr == NULL) 17034 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); 17035 17036 if (attr == NULL || DW_STRING (attr) == NULL) 17037 return NULL; 17038 17039 /* Avoid demangling DW_STRING (attr) the second time on a second 17040 call for the same DIE. */ 17041 if (!DW_STRING_IS_CANONICAL (attr)) 17042 demangled = cplus_demangle (DW_STRING (attr), DMGL_TYPES); 17043 17044 if (demangled) 17045 { 17046 char *base; 17047 17048 /* FIXME: we already did this for the partial symbol... */ 17049 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack, 17050 demangled, strlen (demangled)); 17051 DW_STRING_IS_CANONICAL (attr) = 1; 17052 xfree (demangled); 17053 17054 /* Strip any leading namespaces/classes, keep only the base name. 17055 DW_AT_name for named DIEs does not contain the prefixes. */ 17056 base = strrchr (DW_STRING (attr), ':'); 17057 if (base && base > DW_STRING (attr) && base[-1] == ':') 17058 return &base[1]; 17059 else 17060 return DW_STRING (attr); 17061 } 17062 } 17063 break; 17064 17065 default: 17066 break; 17067 } 17068 17069 if (!DW_STRING_IS_CANONICAL (attr)) 17070 { 17071 DW_STRING (attr) 17072 = dwarf2_canonicalize_name (DW_STRING (attr), cu, 17073 &cu->objfile->objfile_obstack); 17074 DW_STRING_IS_CANONICAL (attr) = 1; 17075 } 17076 return DW_STRING (attr); 17077 } 17078 17079 /* Return the die that this die in an extension of, or NULL if there 17080 is none. *EXT_CU is the CU containing DIE on input, and the CU 17081 containing the return value on output. */ 17082 17083 static struct die_info * 17084 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu) 17085 { 17086 struct attribute *attr; 17087 17088 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu); 17089 if (attr == NULL) 17090 return NULL; 17091 17092 return follow_die_ref (die, attr, ext_cu); 17093 } 17094 17095 /* Convert a DIE tag into its string name. */ 17096 17097 static const char * 17098 dwarf_tag_name (unsigned tag) 17099 { 17100 const char *name = get_DW_TAG_name (tag); 17101 17102 if (name == NULL) 17103 return "DW_TAG_<unknown>"; 17104 17105 return name; 17106 } 17107 17108 /* Convert a DWARF attribute code into its string name. */ 17109 17110 static const char * 17111 dwarf_attr_name (unsigned attr) 17112 { 17113 const char *name; 17114 17115 #ifdef MIPS /* collides with DW_AT_HP_block_index */ 17116 if (attr == DW_AT_MIPS_fde) 17117 return "DW_AT_MIPS_fde"; 17118 #else 17119 if (attr == DW_AT_HP_block_index) 17120 return "DW_AT_HP_block_index"; 17121 #endif 17122 17123 name = get_DW_AT_name (attr); 17124 17125 if (name == NULL) 17126 return "DW_AT_<unknown>"; 17127 17128 return name; 17129 } 17130 17131 /* Convert a DWARF value form code into its string name. */ 17132 17133 static const char * 17134 dwarf_form_name (unsigned form) 17135 { 17136 const char *name = get_DW_FORM_name (form); 17137 17138 if (name == NULL) 17139 return "DW_FORM_<unknown>"; 17140 17141 return name; 17142 } 17143 17144 static char * 17145 dwarf_bool_name (unsigned mybool) 17146 { 17147 if (mybool) 17148 return "TRUE"; 17149 else 17150 return "FALSE"; 17151 } 17152 17153 /* Convert a DWARF type code into its string name. */ 17154 17155 static const char * 17156 dwarf_type_encoding_name (unsigned enc) 17157 { 17158 const char *name = get_DW_ATE_name (enc); 17159 17160 if (name == NULL) 17161 return "DW_ATE_<unknown>"; 17162 17163 return name; 17164 } 17165 17166 static void 17167 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die) 17168 { 17169 unsigned int i; 17170 17171 print_spaces (indent, f); 17172 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n", 17173 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off); 17174 17175 if (die->parent != NULL) 17176 { 17177 print_spaces (indent, f); 17178 fprintf_unfiltered (f, " parent at offset: 0x%x\n", 17179 die->parent->offset.sect_off); 17180 } 17181 17182 print_spaces (indent, f); 17183 fprintf_unfiltered (f, " has children: %s\n", 17184 dwarf_bool_name (die->child != NULL)); 17185 17186 print_spaces (indent, f); 17187 fprintf_unfiltered (f, " attributes:\n"); 17188 17189 for (i = 0; i < die->num_attrs; ++i) 17190 { 17191 print_spaces (indent, f); 17192 fprintf_unfiltered (f, " %s (%s) ", 17193 dwarf_attr_name (die->attrs[i].name), 17194 dwarf_form_name (die->attrs[i].form)); 17195 17196 switch (die->attrs[i].form) 17197 { 17198 case DW_FORM_addr: 17199 case DW_FORM_GNU_addr_index: 17200 fprintf_unfiltered (f, "address: "); 17201 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f); 17202 break; 17203 case DW_FORM_block2: 17204 case DW_FORM_block4: 17205 case DW_FORM_block: 17206 case DW_FORM_block1: 17207 fprintf_unfiltered (f, "block: size %s", 17208 pulongest (DW_BLOCK (&die->attrs[i])->size)); 17209 break; 17210 case DW_FORM_exprloc: 17211 fprintf_unfiltered (f, "expression: size %s", 17212 pulongest (DW_BLOCK (&die->attrs[i])->size)); 17213 break; 17214 case DW_FORM_ref_addr: 17215 fprintf_unfiltered (f, "ref address: "); 17216 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f); 17217 break; 17218 case DW_FORM_GNU_ref_alt: 17219 fprintf_unfiltered (f, "alt ref address: "); 17220 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f); 17221 break; 17222 case DW_FORM_ref1: 17223 case DW_FORM_ref2: 17224 case DW_FORM_ref4: 17225 case DW_FORM_ref8: 17226 case DW_FORM_ref_udata: 17227 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)", 17228 (long) (DW_UNSND (&die->attrs[i]))); 17229 break; 17230 case DW_FORM_data1: 17231 case DW_FORM_data2: 17232 case DW_FORM_data4: 17233 case DW_FORM_data8: 17234 case DW_FORM_udata: 17235 case DW_FORM_sdata: 17236 fprintf_unfiltered (f, "constant: %s", 17237 pulongest (DW_UNSND (&die->attrs[i]))); 17238 break; 17239 case DW_FORM_sec_offset: 17240 fprintf_unfiltered (f, "section offset: %s", 17241 pulongest (DW_UNSND (&die->attrs[i]))); 17242 break; 17243 case DW_FORM_ref_sig8: 17244 if (DW_SIGNATURED_TYPE (&die->attrs[i]) != NULL) 17245 fprintf_unfiltered (f, "signatured type, offset: 0x%x", 17246 DW_SIGNATURED_TYPE (&die->attrs[i])->per_cu.offset.sect_off); 17247 else 17248 fprintf_unfiltered (f, "signatured type, offset: unknown"); 17249 break; 17250 case DW_FORM_string: 17251 case DW_FORM_strp: 17252 case DW_FORM_GNU_str_index: 17253 case DW_FORM_GNU_strp_alt: 17254 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)", 17255 DW_STRING (&die->attrs[i]) 17256 ? DW_STRING (&die->attrs[i]) : "", 17257 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not"); 17258 break; 17259 case DW_FORM_flag: 17260 if (DW_UNSND (&die->attrs[i])) 17261 fprintf_unfiltered (f, "flag: TRUE"); 17262 else 17263 fprintf_unfiltered (f, "flag: FALSE"); 17264 break; 17265 case DW_FORM_flag_present: 17266 fprintf_unfiltered (f, "flag: TRUE"); 17267 break; 17268 case DW_FORM_indirect: 17269 /* The reader will have reduced the indirect form to 17270 the "base form" so this form should not occur. */ 17271 fprintf_unfiltered (f, 17272 "unexpected attribute form: DW_FORM_indirect"); 17273 break; 17274 default: 17275 fprintf_unfiltered (f, "unsupported attribute form: %d.", 17276 die->attrs[i].form); 17277 break; 17278 } 17279 fprintf_unfiltered (f, "\n"); 17280 } 17281 } 17282 17283 static void 17284 dump_die_for_error (struct die_info *die) 17285 { 17286 dump_die_shallow (gdb_stderr, 0, die); 17287 } 17288 17289 static void 17290 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die) 17291 { 17292 int indent = level * 4; 17293 17294 gdb_assert (die != NULL); 17295 17296 if (level >= max_level) 17297 return; 17298 17299 dump_die_shallow (f, indent, die); 17300 17301 if (die->child != NULL) 17302 { 17303 print_spaces (indent, f); 17304 fprintf_unfiltered (f, " Children:"); 17305 if (level + 1 < max_level) 17306 { 17307 fprintf_unfiltered (f, "\n"); 17308 dump_die_1 (f, level + 1, max_level, die->child); 17309 } 17310 else 17311 { 17312 fprintf_unfiltered (f, 17313 " [not printed, max nesting level reached]\n"); 17314 } 17315 } 17316 17317 if (die->sibling != NULL && level > 0) 17318 { 17319 dump_die_1 (f, level, max_level, die->sibling); 17320 } 17321 } 17322 17323 /* This is called from the pdie macro in gdbinit.in. 17324 It's not static so gcc will keep a copy callable from gdb. */ 17325 17326 void 17327 dump_die (struct die_info *die, int max_level) 17328 { 17329 dump_die_1 (gdb_stdlog, 0, max_level, die); 17330 } 17331 17332 static void 17333 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu) 17334 { 17335 void **slot; 17336 17337 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off, 17338 INSERT); 17339 17340 *slot = die; 17341 } 17342 17343 /* DW_ADDR is always stored already as sect_offset; despite for the forms 17344 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */ 17345 17346 static int 17347 is_ref_attr (struct attribute *attr) 17348 { 17349 switch (attr->form) 17350 { 17351 case DW_FORM_ref_addr: 17352 case DW_FORM_ref1: 17353 case DW_FORM_ref2: 17354 case DW_FORM_ref4: 17355 case DW_FORM_ref8: 17356 case DW_FORM_ref_udata: 17357 case DW_FORM_GNU_ref_alt: 17358 return 1; 17359 default: 17360 return 0; 17361 } 17362 } 17363 17364 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the 17365 required kind. */ 17366 17367 static sect_offset 17368 dwarf2_get_ref_die_offset (struct attribute *attr) 17369 { 17370 sect_offset retval = { DW_UNSND (attr) }; 17371 17372 if (is_ref_attr (attr)) 17373 return retval; 17374 17375 retval.sect_off = 0; 17376 complaint (&symfile_complaints, 17377 _("unsupported die ref attribute form: '%s'"), 17378 dwarf_form_name (attr->form)); 17379 return retval; 17380 } 17381 17382 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if 17383 * the value held by the attribute is not constant. */ 17384 17385 static LONGEST 17386 dwarf2_get_attr_constant_value (struct attribute *attr, int default_value) 17387 { 17388 if (attr->form == DW_FORM_sdata) 17389 return DW_SND (attr); 17390 else if (attr->form == DW_FORM_udata 17391 || attr->form == DW_FORM_data1 17392 || attr->form == DW_FORM_data2 17393 || attr->form == DW_FORM_data4 17394 || attr->form == DW_FORM_data8) 17395 return DW_UNSND (attr); 17396 else 17397 { 17398 complaint (&symfile_complaints, 17399 _("Attribute value is not a constant (%s)"), 17400 dwarf_form_name (attr->form)); 17401 return default_value; 17402 } 17403 } 17404 17405 /* Follow reference or signature attribute ATTR of SRC_DIE. 17406 On entry *REF_CU is the CU of SRC_DIE. 17407 On exit *REF_CU is the CU of the result. */ 17408 17409 static struct die_info * 17410 follow_die_ref_or_sig (struct die_info *src_die, struct attribute *attr, 17411 struct dwarf2_cu **ref_cu) 17412 { 17413 struct die_info *die; 17414 17415 if (is_ref_attr (attr)) 17416 die = follow_die_ref (src_die, attr, ref_cu); 17417 else if (attr->form == DW_FORM_ref_sig8) 17418 die = follow_die_sig (src_die, attr, ref_cu); 17419 else 17420 { 17421 dump_die_for_error (src_die); 17422 error (_("Dwarf Error: Expected reference attribute [in module %s]"), 17423 (*ref_cu)->objfile->name); 17424 } 17425 17426 return die; 17427 } 17428 17429 /* Follow reference OFFSET. 17430 On entry *REF_CU is the CU of the source die referencing OFFSET. 17431 On exit *REF_CU is the CU of the result. 17432 Returns NULL if OFFSET is invalid. */ 17433 17434 static struct die_info * 17435 follow_die_offset (sect_offset offset, int offset_in_dwz, 17436 struct dwarf2_cu **ref_cu) 17437 { 17438 struct die_info temp_die; 17439 struct dwarf2_cu *target_cu, *cu = *ref_cu; 17440 17441 gdb_assert (cu->per_cu != NULL); 17442 17443 target_cu = cu; 17444 17445 if (cu->per_cu->is_debug_types) 17446 { 17447 /* .debug_types CUs cannot reference anything outside their CU. 17448 If they need to, they have to reference a signatured type via 17449 DW_FORM_ref_sig8. */ 17450 if (! offset_in_cu_p (&cu->header, offset)) 17451 return NULL; 17452 } 17453 else if (offset_in_dwz != cu->per_cu->is_dwz 17454 || ! offset_in_cu_p (&cu->header, offset)) 17455 { 17456 struct dwarf2_per_cu_data *per_cu; 17457 17458 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz, 17459 cu->objfile); 17460 17461 /* If necessary, add it to the queue and load its DIEs. */ 17462 if (maybe_queue_comp_unit (cu, per_cu, cu->language)) 17463 load_full_comp_unit (per_cu, cu->language); 17464 17465 target_cu = per_cu->cu; 17466 } 17467 else if (cu->dies == NULL) 17468 { 17469 /* We're loading full DIEs during partial symbol reading. */ 17470 gdb_assert (dwarf2_per_objfile->reading_partial_symbols); 17471 load_full_comp_unit (cu->per_cu, language_minimal); 17472 } 17473 17474 *ref_cu = target_cu; 17475 temp_die.offset = offset; 17476 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off); 17477 } 17478 17479 /* Follow reference attribute ATTR of SRC_DIE. 17480 On entry *REF_CU is the CU of SRC_DIE. 17481 On exit *REF_CU is the CU of the result. */ 17482 17483 static struct die_info * 17484 follow_die_ref (struct die_info *src_die, struct attribute *attr, 17485 struct dwarf2_cu **ref_cu) 17486 { 17487 sect_offset offset = dwarf2_get_ref_die_offset (attr); 17488 struct dwarf2_cu *cu = *ref_cu; 17489 struct die_info *die; 17490 17491 die = follow_die_offset (offset, 17492 (attr->form == DW_FORM_GNU_ref_alt 17493 || cu->per_cu->is_dwz), 17494 ref_cu); 17495 if (!die) 17496 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE " 17497 "at 0x%x [in module %s]"), 17498 offset.sect_off, src_die->offset.sect_off, cu->objfile->name); 17499 17500 return die; 17501 } 17502 17503 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU. 17504 Returned value is intended for DW_OP_call*. Returned 17505 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */ 17506 17507 struct dwarf2_locexpr_baton 17508 dwarf2_fetch_die_loc_sect_off (sect_offset offset, 17509 struct dwarf2_per_cu_data *per_cu, 17510 CORE_ADDR (*get_frame_pc) (void *baton), 17511 void *baton) 17512 { 17513 struct dwarf2_cu *cu; 17514 struct die_info *die; 17515 struct attribute *attr; 17516 struct dwarf2_locexpr_baton retval; 17517 17518 dw2_setup (per_cu->objfile); 17519 17520 if (per_cu->cu == NULL) 17521 load_cu (per_cu); 17522 cu = per_cu->cu; 17523 17524 die = follow_die_offset (offset, per_cu->is_dwz, &cu); 17525 if (!die) 17526 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"), 17527 offset.sect_off, per_cu->objfile->name); 17528 17529 attr = dwarf2_attr (die, DW_AT_location, cu); 17530 if (!attr) 17531 { 17532 /* DWARF: "If there is no such attribute, then there is no effect.". 17533 DATA is ignored if SIZE is 0. */ 17534 17535 retval.data = NULL; 17536 retval.size = 0; 17537 } 17538 else if (attr_form_is_section_offset (attr)) 17539 { 17540 struct dwarf2_loclist_baton loclist_baton; 17541 CORE_ADDR pc = (*get_frame_pc) (baton); 17542 size_t size; 17543 17544 fill_in_loclist_baton (cu, &loclist_baton, attr); 17545 17546 retval.data = dwarf2_find_location_expression (&loclist_baton, 17547 &size, pc); 17548 retval.size = size; 17549 } 17550 else 17551 { 17552 if (!attr_form_is_block (attr)) 17553 error (_("Dwarf Error: DIE at 0x%x referenced in module %s " 17554 "is neither DW_FORM_block* nor DW_FORM_exprloc"), 17555 offset.sect_off, per_cu->objfile->name); 17556 17557 retval.data = DW_BLOCK (attr)->data; 17558 retval.size = DW_BLOCK (attr)->size; 17559 } 17560 retval.per_cu = cu->per_cu; 17561 17562 age_cached_comp_units (); 17563 17564 return retval; 17565 } 17566 17567 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU 17568 offset. */ 17569 17570 struct dwarf2_locexpr_baton 17571 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu, 17572 struct dwarf2_per_cu_data *per_cu, 17573 CORE_ADDR (*get_frame_pc) (void *baton), 17574 void *baton) 17575 { 17576 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off }; 17577 17578 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton); 17579 } 17580 17581 /* Return the type of the DIE at DIE_OFFSET in the CU named by 17582 PER_CU. */ 17583 17584 struct type * 17585 dwarf2_get_die_type (cu_offset die_offset, 17586 struct dwarf2_per_cu_data *per_cu) 17587 { 17588 sect_offset die_offset_sect; 17589 17590 dw2_setup (per_cu->objfile); 17591 17592 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off; 17593 return get_die_type_at_offset (die_offset_sect, per_cu); 17594 } 17595 17596 /* Follow the signature attribute ATTR in SRC_DIE. 17597 On entry *REF_CU is the CU of SRC_DIE. 17598 On exit *REF_CU is the CU of the result. */ 17599 17600 static struct die_info * 17601 follow_die_sig (struct die_info *src_die, struct attribute *attr, 17602 struct dwarf2_cu **ref_cu) 17603 { 17604 struct objfile *objfile = (*ref_cu)->objfile; 17605 struct die_info temp_die; 17606 struct signatured_type *sig_type = DW_SIGNATURED_TYPE (attr); 17607 struct dwarf2_cu *sig_cu; 17608 struct die_info *die; 17609 17610 /* sig_type will be NULL if the signatured type is missing from 17611 the debug info. */ 17612 if (sig_type == NULL) 17613 error (_("Dwarf Error: Cannot find signatured DIE referenced from DIE " 17614 "at 0x%x [in module %s]"), 17615 src_die->offset.sect_off, objfile->name); 17616 17617 /* If necessary, add it to the queue and load its DIEs. */ 17618 17619 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal)) 17620 read_signatured_type (sig_type); 17621 17622 gdb_assert (sig_type->per_cu.cu != NULL); 17623 17624 sig_cu = sig_type->per_cu.cu; 17625 gdb_assert (sig_type->type_offset_in_section.sect_off != 0); 17626 temp_die.offset = sig_type->type_offset_in_section; 17627 die = htab_find_with_hash (sig_cu->die_hash, &temp_die, 17628 temp_die.offset.sect_off); 17629 if (die) 17630 { 17631 /* For .gdb_index version 7 keep track of included TUs. 17632 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */ 17633 if (dwarf2_per_objfile->index_table != NULL 17634 && dwarf2_per_objfile->index_table->version <= 7) 17635 { 17636 VEC_safe_push (dwarf2_per_cu_ptr, 17637 (*ref_cu)->per_cu->imported_symtabs, 17638 sig_cu->per_cu); 17639 } 17640 17641 *ref_cu = sig_cu; 17642 return die; 17643 } 17644 17645 error (_("Dwarf Error: Cannot find signatured DIE at 0x%x referenced " 17646 "from DIE at 0x%x [in module %s]"), 17647 temp_die.offset.sect_off, src_die->offset.sect_off, objfile->name); 17648 } 17649 17650 /* Given an offset of a signatured type, return its signatured_type. */ 17651 17652 static struct signatured_type * 17653 lookup_signatured_type_at_offset (struct objfile *objfile, 17654 struct dwarf2_section_info *section, 17655 sect_offset offset) 17656 { 17657 gdb_byte *info_ptr = section->buffer + offset.sect_off; 17658 unsigned int length, initial_length_size; 17659 unsigned int sig_offset; 17660 struct signatured_type find_entry, *sig_type; 17661 17662 length = read_initial_length (objfile->obfd, info_ptr, &initial_length_size); 17663 sig_offset = (initial_length_size 17664 + 2 /*version*/ 17665 + (initial_length_size == 4 ? 4 : 8) /*debug_abbrev_offset*/ 17666 + 1 /*address_size*/); 17667 find_entry.signature = bfd_get_64 (objfile->obfd, info_ptr + sig_offset); 17668 sig_type = htab_find (dwarf2_per_objfile->signatured_types, &find_entry); 17669 17670 /* This is only used to lookup previously recorded types. 17671 If we didn't find it, it's our bug. */ 17672 gdb_assert (sig_type != NULL); 17673 gdb_assert (offset.sect_off == sig_type->per_cu.offset.sect_off); 17674 17675 return sig_type; 17676 } 17677 17678 /* Load the DIEs associated with type unit PER_CU into memory. */ 17679 17680 static void 17681 load_full_type_unit (struct dwarf2_per_cu_data *per_cu) 17682 { 17683 struct signatured_type *sig_type; 17684 17685 /* Caller is responsible for ensuring type_unit_groups don't get here. */ 17686 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu)); 17687 17688 /* We have the per_cu, but we need the signatured_type. 17689 Fortunately this is an easy translation. */ 17690 gdb_assert (per_cu->is_debug_types); 17691 sig_type = (struct signatured_type *) per_cu; 17692 17693 gdb_assert (per_cu->cu == NULL); 17694 17695 read_signatured_type (sig_type); 17696 17697 gdb_assert (per_cu->cu != NULL); 17698 } 17699 17700 /* die_reader_func for read_signatured_type. 17701 This is identical to load_full_comp_unit_reader, 17702 but is kept separate for now. */ 17703 17704 static void 17705 read_signatured_type_reader (const struct die_reader_specs *reader, 17706 gdb_byte *info_ptr, 17707 struct die_info *comp_unit_die, 17708 int has_children, 17709 void *data) 17710 { 17711 struct dwarf2_cu *cu = reader->cu; 17712 17713 gdb_assert (cu->die_hash == NULL); 17714 cu->die_hash = 17715 htab_create_alloc_ex (cu->header.length / 12, 17716 die_hash, 17717 die_eq, 17718 NULL, 17719 &cu->comp_unit_obstack, 17720 hashtab_obstack_allocate, 17721 dummy_obstack_deallocate); 17722 17723 if (has_children) 17724 comp_unit_die->child = read_die_and_siblings (reader, info_ptr, 17725 &info_ptr, comp_unit_die); 17726 cu->dies = comp_unit_die; 17727 /* comp_unit_die is not stored in die_hash, no need. */ 17728 17729 /* We try not to read any attributes in this function, because not 17730 all CUs needed for references have been loaded yet, and symbol 17731 table processing isn't initialized. But we have to set the CU language, 17732 or we won't be able to build types correctly. 17733 Similarly, if we do not read the producer, we can not apply 17734 producer-specific interpretation. */ 17735 prepare_one_comp_unit (cu, cu->dies, language_minimal); 17736 } 17737 17738 /* Read in a signatured type and build its CU and DIEs. 17739 If the type is a stub for the real type in a DWO file, 17740 read in the real type from the DWO file as well. */ 17741 17742 static void 17743 read_signatured_type (struct signatured_type *sig_type) 17744 { 17745 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu; 17746 17747 gdb_assert (per_cu->is_debug_types); 17748 gdb_assert (per_cu->cu == NULL); 17749 17750 init_cutu_and_read_dies (per_cu, NULL, 0, 1, 17751 read_signatured_type_reader, NULL); 17752 } 17753 17754 /* Decode simple location descriptions. 17755 Given a pointer to a dwarf block that defines a location, compute 17756 the location and return the value. 17757 17758 NOTE drow/2003-11-18: This function is called in two situations 17759 now: for the address of static or global variables (partial symbols 17760 only) and for offsets into structures which are expected to be 17761 (more or less) constant. The partial symbol case should go away, 17762 and only the constant case should remain. That will let this 17763 function complain more accurately. A few special modes are allowed 17764 without complaint for global variables (for instance, global 17765 register values and thread-local values). 17766 17767 A location description containing no operations indicates that the 17768 object is optimized out. The return value is 0 for that case. 17769 FIXME drow/2003-11-16: No callers check for this case any more; soon all 17770 callers will only want a very basic result and this can become a 17771 complaint. 17772 17773 Note that stack[0] is unused except as a default error return. */ 17774 17775 static CORE_ADDR 17776 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu) 17777 { 17778 struct objfile *objfile = cu->objfile; 17779 size_t i; 17780 size_t size = blk->size; 17781 gdb_byte *data = blk->data; 17782 CORE_ADDR stack[64]; 17783 int stacki; 17784 unsigned int bytes_read, unsnd; 17785 gdb_byte op; 17786 17787 i = 0; 17788 stacki = 0; 17789 stack[stacki] = 0; 17790 stack[++stacki] = 0; 17791 17792 while (i < size) 17793 { 17794 op = data[i++]; 17795 switch (op) 17796 { 17797 case DW_OP_lit0: 17798 case DW_OP_lit1: 17799 case DW_OP_lit2: 17800 case DW_OP_lit3: 17801 case DW_OP_lit4: 17802 case DW_OP_lit5: 17803 case DW_OP_lit6: 17804 case DW_OP_lit7: 17805 case DW_OP_lit8: 17806 case DW_OP_lit9: 17807 case DW_OP_lit10: 17808 case DW_OP_lit11: 17809 case DW_OP_lit12: 17810 case DW_OP_lit13: 17811 case DW_OP_lit14: 17812 case DW_OP_lit15: 17813 case DW_OP_lit16: 17814 case DW_OP_lit17: 17815 case DW_OP_lit18: 17816 case DW_OP_lit19: 17817 case DW_OP_lit20: 17818 case DW_OP_lit21: 17819 case DW_OP_lit22: 17820 case DW_OP_lit23: 17821 case DW_OP_lit24: 17822 case DW_OP_lit25: 17823 case DW_OP_lit26: 17824 case DW_OP_lit27: 17825 case DW_OP_lit28: 17826 case DW_OP_lit29: 17827 case DW_OP_lit30: 17828 case DW_OP_lit31: 17829 stack[++stacki] = op - DW_OP_lit0; 17830 break; 17831 17832 case DW_OP_reg0: 17833 case DW_OP_reg1: 17834 case DW_OP_reg2: 17835 case DW_OP_reg3: 17836 case DW_OP_reg4: 17837 case DW_OP_reg5: 17838 case DW_OP_reg6: 17839 case DW_OP_reg7: 17840 case DW_OP_reg8: 17841 case DW_OP_reg9: 17842 case DW_OP_reg10: 17843 case DW_OP_reg11: 17844 case DW_OP_reg12: 17845 case DW_OP_reg13: 17846 case DW_OP_reg14: 17847 case DW_OP_reg15: 17848 case DW_OP_reg16: 17849 case DW_OP_reg17: 17850 case DW_OP_reg18: 17851 case DW_OP_reg19: 17852 case DW_OP_reg20: 17853 case DW_OP_reg21: 17854 case DW_OP_reg22: 17855 case DW_OP_reg23: 17856 case DW_OP_reg24: 17857 case DW_OP_reg25: 17858 case DW_OP_reg26: 17859 case DW_OP_reg27: 17860 case DW_OP_reg28: 17861 case DW_OP_reg29: 17862 case DW_OP_reg30: 17863 case DW_OP_reg31: 17864 stack[++stacki] = op - DW_OP_reg0; 17865 if (i < size) 17866 dwarf2_complex_location_expr_complaint (); 17867 break; 17868 17869 case DW_OP_regx: 17870 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read); 17871 i += bytes_read; 17872 stack[++stacki] = unsnd; 17873 if (i < size) 17874 dwarf2_complex_location_expr_complaint (); 17875 break; 17876 17877 case DW_OP_addr: 17878 stack[++stacki] = read_address (objfile->obfd, &data[i], 17879 cu, &bytes_read); 17880 i += bytes_read; 17881 break; 17882 17883 case DW_OP_const1u: 17884 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]); 17885 i += 1; 17886 break; 17887 17888 case DW_OP_const1s: 17889 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]); 17890 i += 1; 17891 break; 17892 17893 case DW_OP_const2u: 17894 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]); 17895 i += 2; 17896 break; 17897 17898 case DW_OP_const2s: 17899 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]); 17900 i += 2; 17901 break; 17902 17903 case DW_OP_const4u: 17904 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]); 17905 i += 4; 17906 break; 17907 17908 case DW_OP_const4s: 17909 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]); 17910 i += 4; 17911 break; 17912 17913 case DW_OP_const8u: 17914 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]); 17915 i += 8; 17916 break; 17917 17918 case DW_OP_constu: 17919 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i), 17920 &bytes_read); 17921 i += bytes_read; 17922 break; 17923 17924 case DW_OP_consts: 17925 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read); 17926 i += bytes_read; 17927 break; 17928 17929 case DW_OP_dup: 17930 stack[stacki + 1] = stack[stacki]; 17931 stacki++; 17932 break; 17933 17934 case DW_OP_plus: 17935 stack[stacki - 1] += stack[stacki]; 17936 stacki--; 17937 break; 17938 17939 case DW_OP_plus_uconst: 17940 stack[stacki] += read_unsigned_leb128 (NULL, (data + i), 17941 &bytes_read); 17942 i += bytes_read; 17943 break; 17944 17945 case DW_OP_minus: 17946 stack[stacki - 1] -= stack[stacki]; 17947 stacki--; 17948 break; 17949 17950 case DW_OP_deref: 17951 /* If we're not the last op, then we definitely can't encode 17952 this using GDB's address_class enum. This is valid for partial 17953 global symbols, although the variable's address will be bogus 17954 in the psymtab. */ 17955 if (i < size) 17956 dwarf2_complex_location_expr_complaint (); 17957 break; 17958 17959 case DW_OP_GNU_push_tls_address: 17960 /* The top of the stack has the offset from the beginning 17961 of the thread control block at which the variable is located. */ 17962 /* Nothing should follow this operator, so the top of stack would 17963 be returned. */ 17964 /* This is valid for partial global symbols, but the variable's 17965 address will be bogus in the psymtab. Make it always at least 17966 non-zero to not look as a variable garbage collected by linker 17967 which have DW_OP_addr 0. */ 17968 if (i < size) 17969 dwarf2_complex_location_expr_complaint (); 17970 stack[stacki]++; 17971 break; 17972 17973 case DW_OP_GNU_uninit: 17974 break; 17975 17976 case DW_OP_GNU_addr_index: 17977 case DW_OP_GNU_const_index: 17978 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i], 17979 &bytes_read); 17980 i += bytes_read; 17981 break; 17982 17983 default: 17984 { 17985 const char *name = get_DW_OP_name (op); 17986 17987 if (name) 17988 complaint (&symfile_complaints, _("unsupported stack op: '%s'"), 17989 name); 17990 else 17991 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"), 17992 op); 17993 } 17994 17995 return (stack[stacki]); 17996 } 17997 17998 /* Enforce maximum stack depth of SIZE-1 to avoid writing 17999 outside of the allocated space. Also enforce minimum>0. */ 18000 if (stacki >= ARRAY_SIZE (stack) - 1) 18001 { 18002 complaint (&symfile_complaints, 18003 _("location description stack overflow")); 18004 return 0; 18005 } 18006 18007 if (stacki <= 0) 18008 { 18009 complaint (&symfile_complaints, 18010 _("location description stack underflow")); 18011 return 0; 18012 } 18013 } 18014 return (stack[stacki]); 18015 } 18016 18017 /* memory allocation interface */ 18018 18019 static struct dwarf_block * 18020 dwarf_alloc_block (struct dwarf2_cu *cu) 18021 { 18022 struct dwarf_block *blk; 18023 18024 blk = (struct dwarf_block *) 18025 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block)); 18026 return (blk); 18027 } 18028 18029 static struct die_info * 18030 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs) 18031 { 18032 struct die_info *die; 18033 size_t size = sizeof (struct die_info); 18034 18035 if (num_attrs > 1) 18036 size += (num_attrs - 1) * sizeof (struct attribute); 18037 18038 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size); 18039 memset (die, 0, sizeof (struct die_info)); 18040 return (die); 18041 } 18042 18043 18044 /* Macro support. */ 18045 18046 /* Return file name relative to the compilation directory of file number I in 18047 *LH's file name table. The result is allocated using xmalloc; the caller is 18048 responsible for freeing it. */ 18049 18050 static char * 18051 file_file_name (int file, struct line_header *lh) 18052 { 18053 /* Is the file number a valid index into the line header's file name 18054 table? Remember that file numbers start with one, not zero. */ 18055 if (1 <= file && file <= lh->num_file_names) 18056 { 18057 struct file_entry *fe = &lh->file_names[file - 1]; 18058 18059 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0) 18060 return xstrdup (fe->name); 18061 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING, 18062 fe->name, NULL); 18063 } 18064 else 18065 { 18066 /* The compiler produced a bogus file number. We can at least 18067 record the macro definitions made in the file, even if we 18068 won't be able to find the file by name. */ 18069 char fake_name[80]; 18070 18071 xsnprintf (fake_name, sizeof (fake_name), 18072 "<bad macro file number %d>", file); 18073 18074 complaint (&symfile_complaints, 18075 _("bad file number in macro information (%d)"), 18076 file); 18077 18078 return xstrdup (fake_name); 18079 } 18080 } 18081 18082 /* Return the full name of file number I in *LH's file name table. 18083 Use COMP_DIR as the name of the current directory of the 18084 compilation. The result is allocated using xmalloc; the caller is 18085 responsible for freeing it. */ 18086 static char * 18087 file_full_name (int file, struct line_header *lh, const char *comp_dir) 18088 { 18089 /* Is the file number a valid index into the line header's file name 18090 table? Remember that file numbers start with one, not zero. */ 18091 if (1 <= file && file <= lh->num_file_names) 18092 { 18093 char *relative = file_file_name (file, lh); 18094 18095 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL) 18096 return relative; 18097 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL); 18098 } 18099 else 18100 return file_file_name (file, lh); 18101 } 18102 18103 18104 static struct macro_source_file * 18105 macro_start_file (int file, int line, 18106 struct macro_source_file *current_file, 18107 const char *comp_dir, 18108 struct line_header *lh, struct objfile *objfile) 18109 { 18110 /* File name relative to the compilation directory of this source file. */ 18111 char *file_name = file_file_name (file, lh); 18112 18113 /* We don't create a macro table for this compilation unit 18114 at all until we actually get a filename. */ 18115 if (! pending_macros) 18116 pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack, 18117 objfile->per_bfd->macro_cache, 18118 comp_dir); 18119 18120 if (! current_file) 18121 { 18122 /* If we have no current file, then this must be the start_file 18123 directive for the compilation unit's main source file. */ 18124 current_file = macro_set_main (pending_macros, file_name); 18125 macro_define_special (pending_macros); 18126 } 18127 else 18128 current_file = macro_include (current_file, line, file_name); 18129 18130 xfree (file_name); 18131 18132 return current_file; 18133 } 18134 18135 18136 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory, 18137 followed by a null byte. */ 18138 static char * 18139 copy_string (const char *buf, int len) 18140 { 18141 char *s = xmalloc (len + 1); 18142 18143 memcpy (s, buf, len); 18144 s[len] = '\0'; 18145 return s; 18146 } 18147 18148 18149 static const char * 18150 consume_improper_spaces (const char *p, const char *body) 18151 { 18152 if (*p == ' ') 18153 { 18154 complaint (&symfile_complaints, 18155 _("macro definition contains spaces " 18156 "in formal argument list:\n`%s'"), 18157 body); 18158 18159 while (*p == ' ') 18160 p++; 18161 } 18162 18163 return p; 18164 } 18165 18166 18167 static void 18168 parse_macro_definition (struct macro_source_file *file, int line, 18169 const char *body) 18170 { 18171 const char *p; 18172 18173 /* The body string takes one of two forms. For object-like macro 18174 definitions, it should be: 18175 18176 <macro name> " " <definition> 18177 18178 For function-like macro definitions, it should be: 18179 18180 <macro name> "() " <definition> 18181 or 18182 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition> 18183 18184 Spaces may appear only where explicitly indicated, and in the 18185 <definition>. 18186 18187 The Dwarf 2 spec says that an object-like macro's name is always 18188 followed by a space, but versions of GCC around March 2002 omit 18189 the space when the macro's definition is the empty string. 18190 18191 The Dwarf 2 spec says that there should be no spaces between the 18192 formal arguments in a function-like macro's formal argument list, 18193 but versions of GCC around March 2002 include spaces after the 18194 commas. */ 18195 18196 18197 /* Find the extent of the macro name. The macro name is terminated 18198 by either a space or null character (for an object-like macro) or 18199 an opening paren (for a function-like macro). */ 18200 for (p = body; *p; p++) 18201 if (*p == ' ' || *p == '(') 18202 break; 18203 18204 if (*p == ' ' || *p == '\0') 18205 { 18206 /* It's an object-like macro. */ 18207 int name_len = p - body; 18208 char *name = copy_string (body, name_len); 18209 const char *replacement; 18210 18211 if (*p == ' ') 18212 replacement = body + name_len + 1; 18213 else 18214 { 18215 dwarf2_macro_malformed_definition_complaint (body); 18216 replacement = body + name_len; 18217 } 18218 18219 macro_define_object (file, line, name, replacement); 18220 18221 xfree (name); 18222 } 18223 else if (*p == '(') 18224 { 18225 /* It's a function-like macro. */ 18226 char *name = copy_string (body, p - body); 18227 int argc = 0; 18228 int argv_size = 1; 18229 char **argv = xmalloc (argv_size * sizeof (*argv)); 18230 18231 p++; 18232 18233 p = consume_improper_spaces (p, body); 18234 18235 /* Parse the formal argument list. */ 18236 while (*p && *p != ')') 18237 { 18238 /* Find the extent of the current argument name. */ 18239 const char *arg_start = p; 18240 18241 while (*p && *p != ',' && *p != ')' && *p != ' ') 18242 p++; 18243 18244 if (! *p || p == arg_start) 18245 dwarf2_macro_malformed_definition_complaint (body); 18246 else 18247 { 18248 /* Make sure argv has room for the new argument. */ 18249 if (argc >= argv_size) 18250 { 18251 argv_size *= 2; 18252 argv = xrealloc (argv, argv_size * sizeof (*argv)); 18253 } 18254 18255 argv[argc++] = copy_string (arg_start, p - arg_start); 18256 } 18257 18258 p = consume_improper_spaces (p, body); 18259 18260 /* Consume the comma, if present. */ 18261 if (*p == ',') 18262 { 18263 p++; 18264 18265 p = consume_improper_spaces (p, body); 18266 } 18267 } 18268 18269 if (*p == ')') 18270 { 18271 p++; 18272 18273 if (*p == ' ') 18274 /* Perfectly formed definition, no complaints. */ 18275 macro_define_function (file, line, name, 18276 argc, (const char **) argv, 18277 p + 1); 18278 else if (*p == '\0') 18279 { 18280 /* Complain, but do define it. */ 18281 dwarf2_macro_malformed_definition_complaint (body); 18282 macro_define_function (file, line, name, 18283 argc, (const char **) argv, 18284 p); 18285 } 18286 else 18287 /* Just complain. */ 18288 dwarf2_macro_malformed_definition_complaint (body); 18289 } 18290 else 18291 /* Just complain. */ 18292 dwarf2_macro_malformed_definition_complaint (body); 18293 18294 xfree (name); 18295 { 18296 int i; 18297 18298 for (i = 0; i < argc; i++) 18299 xfree (argv[i]); 18300 } 18301 xfree (argv); 18302 } 18303 else 18304 dwarf2_macro_malformed_definition_complaint (body); 18305 } 18306 18307 /* Skip some bytes from BYTES according to the form given in FORM. 18308 Returns the new pointer. */ 18309 18310 static gdb_byte * 18311 skip_form_bytes (bfd *abfd, gdb_byte *bytes, gdb_byte *buffer_end, 18312 enum dwarf_form form, 18313 unsigned int offset_size, 18314 struct dwarf2_section_info *section) 18315 { 18316 unsigned int bytes_read; 18317 18318 switch (form) 18319 { 18320 case DW_FORM_data1: 18321 case DW_FORM_flag: 18322 ++bytes; 18323 break; 18324 18325 case DW_FORM_data2: 18326 bytes += 2; 18327 break; 18328 18329 case DW_FORM_data4: 18330 bytes += 4; 18331 break; 18332 18333 case DW_FORM_data8: 18334 bytes += 8; 18335 break; 18336 18337 case DW_FORM_string: 18338 read_direct_string (abfd, bytes, &bytes_read); 18339 bytes += bytes_read; 18340 break; 18341 18342 case DW_FORM_sec_offset: 18343 case DW_FORM_strp: 18344 case DW_FORM_GNU_strp_alt: 18345 bytes += offset_size; 18346 break; 18347 18348 case DW_FORM_block: 18349 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read); 18350 bytes += bytes_read; 18351 break; 18352 18353 case DW_FORM_block1: 18354 bytes += 1 + read_1_byte (abfd, bytes); 18355 break; 18356 case DW_FORM_block2: 18357 bytes += 2 + read_2_bytes (abfd, bytes); 18358 break; 18359 case DW_FORM_block4: 18360 bytes += 4 + read_4_bytes (abfd, bytes); 18361 break; 18362 18363 case DW_FORM_sdata: 18364 case DW_FORM_udata: 18365 case DW_FORM_GNU_addr_index: 18366 case DW_FORM_GNU_str_index: 18367 bytes = (gdb_byte *) gdb_skip_leb128 (bytes, buffer_end); 18368 if (bytes == NULL) 18369 { 18370 dwarf2_section_buffer_overflow_complaint (section); 18371 return NULL; 18372 } 18373 break; 18374 18375 default: 18376 { 18377 complain: 18378 complaint (&symfile_complaints, 18379 _("invalid form 0x%x in `%s'"), 18380 form, 18381 section->asection->name); 18382 return NULL; 18383 } 18384 } 18385 18386 return bytes; 18387 } 18388 18389 /* A helper for dwarf_decode_macros that handles skipping an unknown 18390 opcode. Returns an updated pointer to the macro data buffer; or, 18391 on error, issues a complaint and returns NULL. */ 18392 18393 static gdb_byte * 18394 skip_unknown_opcode (unsigned int opcode, 18395 gdb_byte **opcode_definitions, 18396 gdb_byte *mac_ptr, gdb_byte *mac_end, 18397 bfd *abfd, 18398 unsigned int offset_size, 18399 struct dwarf2_section_info *section) 18400 { 18401 unsigned int bytes_read, i; 18402 unsigned long arg; 18403 gdb_byte *defn; 18404 18405 if (opcode_definitions[opcode] == NULL) 18406 { 18407 complaint (&symfile_complaints, 18408 _("unrecognized DW_MACFINO opcode 0x%x"), 18409 opcode); 18410 return NULL; 18411 } 18412 18413 defn = opcode_definitions[opcode]; 18414 arg = read_unsigned_leb128 (abfd, defn, &bytes_read); 18415 defn += bytes_read; 18416 18417 for (i = 0; i < arg; ++i) 18418 { 18419 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size, 18420 section); 18421 if (mac_ptr == NULL) 18422 { 18423 /* skip_form_bytes already issued the complaint. */ 18424 return NULL; 18425 } 18426 } 18427 18428 return mac_ptr; 18429 } 18430 18431 /* A helper function which parses the header of a macro section. 18432 If the macro section is the extended (for now called "GNU") type, 18433 then this updates *OFFSET_SIZE. Returns a pointer to just after 18434 the header, or issues a complaint and returns NULL on error. */ 18435 18436 static gdb_byte * 18437 dwarf_parse_macro_header (gdb_byte **opcode_definitions, 18438 bfd *abfd, 18439 gdb_byte *mac_ptr, 18440 unsigned int *offset_size, 18441 int section_is_gnu) 18442 { 18443 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *)); 18444 18445 if (section_is_gnu) 18446 { 18447 unsigned int version, flags; 18448 18449 version = read_2_bytes (abfd, mac_ptr); 18450 if (version != 4) 18451 { 18452 complaint (&symfile_complaints, 18453 _("unrecognized version `%d' in .debug_macro section"), 18454 version); 18455 return NULL; 18456 } 18457 mac_ptr += 2; 18458 18459 flags = read_1_byte (abfd, mac_ptr); 18460 ++mac_ptr; 18461 *offset_size = (flags & 1) ? 8 : 4; 18462 18463 if ((flags & 2) != 0) 18464 /* We don't need the line table offset. */ 18465 mac_ptr += *offset_size; 18466 18467 /* Vendor opcode descriptions. */ 18468 if ((flags & 4) != 0) 18469 { 18470 unsigned int i, count; 18471 18472 count = read_1_byte (abfd, mac_ptr); 18473 ++mac_ptr; 18474 for (i = 0; i < count; ++i) 18475 { 18476 unsigned int opcode, bytes_read; 18477 unsigned long arg; 18478 18479 opcode = read_1_byte (abfd, mac_ptr); 18480 ++mac_ptr; 18481 opcode_definitions[opcode] = mac_ptr; 18482 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18483 mac_ptr += bytes_read; 18484 mac_ptr += arg; 18485 } 18486 } 18487 } 18488 18489 return mac_ptr; 18490 } 18491 18492 /* A helper for dwarf_decode_macros that handles the GNU extensions, 18493 including DW_MACRO_GNU_transparent_include. */ 18494 18495 static void 18496 dwarf_decode_macro_bytes (bfd *abfd, gdb_byte *mac_ptr, gdb_byte *mac_end, 18497 struct macro_source_file *current_file, 18498 struct line_header *lh, const char *comp_dir, 18499 struct dwarf2_section_info *section, 18500 int section_is_gnu, int section_is_dwz, 18501 unsigned int offset_size, 18502 struct objfile *objfile, 18503 htab_t include_hash) 18504 { 18505 enum dwarf_macro_record_type macinfo_type; 18506 int at_commandline; 18507 gdb_byte *opcode_definitions[256]; 18508 18509 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr, 18510 &offset_size, section_is_gnu); 18511 if (mac_ptr == NULL) 18512 { 18513 /* We already issued a complaint. */ 18514 return; 18515 } 18516 18517 /* Determines if GDB is still before first DW_MACINFO_start_file. If true 18518 GDB is still reading the definitions from command line. First 18519 DW_MACINFO_start_file will need to be ignored as it was already executed 18520 to create CURRENT_FILE for the main source holding also the command line 18521 definitions. On first met DW_MACINFO_start_file this flag is reset to 18522 normally execute all the remaining DW_MACINFO_start_file macinfos. */ 18523 18524 at_commandline = 1; 18525 18526 do 18527 { 18528 /* Do we at least have room for a macinfo type byte? */ 18529 if (mac_ptr >= mac_end) 18530 { 18531 dwarf2_section_buffer_overflow_complaint (section); 18532 break; 18533 } 18534 18535 macinfo_type = read_1_byte (abfd, mac_ptr); 18536 mac_ptr++; 18537 18538 /* Note that we rely on the fact that the corresponding GNU and 18539 DWARF constants are the same. */ 18540 switch (macinfo_type) 18541 { 18542 /* A zero macinfo type indicates the end of the macro 18543 information. */ 18544 case 0: 18545 break; 18546 18547 case DW_MACRO_GNU_define: 18548 case DW_MACRO_GNU_undef: 18549 case DW_MACRO_GNU_define_indirect: 18550 case DW_MACRO_GNU_undef_indirect: 18551 case DW_MACRO_GNU_define_indirect_alt: 18552 case DW_MACRO_GNU_undef_indirect_alt: 18553 { 18554 unsigned int bytes_read; 18555 int line; 18556 char *body; 18557 int is_define; 18558 18559 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18560 mac_ptr += bytes_read; 18561 18562 if (macinfo_type == DW_MACRO_GNU_define 18563 || macinfo_type == DW_MACRO_GNU_undef) 18564 { 18565 body = read_direct_string (abfd, mac_ptr, &bytes_read); 18566 mac_ptr += bytes_read; 18567 } 18568 else 18569 { 18570 LONGEST str_offset; 18571 18572 str_offset = read_offset_1 (abfd, mac_ptr, offset_size); 18573 mac_ptr += offset_size; 18574 18575 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt 18576 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt 18577 || section_is_dwz) 18578 { 18579 struct dwz_file *dwz = dwarf2_get_dwz_file (); 18580 18581 body = read_indirect_string_from_dwz (dwz, str_offset); 18582 } 18583 else 18584 body = read_indirect_string_at_offset (abfd, str_offset); 18585 } 18586 18587 is_define = (macinfo_type == DW_MACRO_GNU_define 18588 || macinfo_type == DW_MACRO_GNU_define_indirect 18589 || macinfo_type == DW_MACRO_GNU_define_indirect_alt); 18590 if (! current_file) 18591 { 18592 /* DWARF violation as no main source is present. */ 18593 complaint (&symfile_complaints, 18594 _("debug info with no main source gives macro %s " 18595 "on line %d: %s"), 18596 is_define ? _("definition") : _("undefinition"), 18597 line, body); 18598 break; 18599 } 18600 if ((line == 0 && !at_commandline) 18601 || (line != 0 && at_commandline)) 18602 complaint (&symfile_complaints, 18603 _("debug info gives %s macro %s with %s line %d: %s"), 18604 at_commandline ? _("command-line") : _("in-file"), 18605 is_define ? _("definition") : _("undefinition"), 18606 line == 0 ? _("zero") : _("non-zero"), line, body); 18607 18608 if (is_define) 18609 parse_macro_definition (current_file, line, body); 18610 else 18611 { 18612 gdb_assert (macinfo_type == DW_MACRO_GNU_undef 18613 || macinfo_type == DW_MACRO_GNU_undef_indirect 18614 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt); 18615 macro_undef (current_file, line, body); 18616 } 18617 } 18618 break; 18619 18620 case DW_MACRO_GNU_start_file: 18621 { 18622 unsigned int bytes_read; 18623 int line, file; 18624 18625 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18626 mac_ptr += bytes_read; 18627 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18628 mac_ptr += bytes_read; 18629 18630 if ((line == 0 && !at_commandline) 18631 || (line != 0 && at_commandline)) 18632 complaint (&symfile_complaints, 18633 _("debug info gives source %d included " 18634 "from %s at %s line %d"), 18635 file, at_commandline ? _("command-line") : _("file"), 18636 line == 0 ? _("zero") : _("non-zero"), line); 18637 18638 if (at_commandline) 18639 { 18640 /* This DW_MACRO_GNU_start_file was executed in the 18641 pass one. */ 18642 at_commandline = 0; 18643 } 18644 else 18645 current_file = macro_start_file (file, line, 18646 current_file, comp_dir, 18647 lh, objfile); 18648 } 18649 break; 18650 18651 case DW_MACRO_GNU_end_file: 18652 if (! current_file) 18653 complaint (&symfile_complaints, 18654 _("macro debug info has an unmatched " 18655 "`close_file' directive")); 18656 else 18657 { 18658 current_file = current_file->included_by; 18659 if (! current_file) 18660 { 18661 enum dwarf_macro_record_type next_type; 18662 18663 /* GCC circa March 2002 doesn't produce the zero 18664 type byte marking the end of the compilation 18665 unit. Complain if it's not there, but exit no 18666 matter what. */ 18667 18668 /* Do we at least have room for a macinfo type byte? */ 18669 if (mac_ptr >= mac_end) 18670 { 18671 dwarf2_section_buffer_overflow_complaint (section); 18672 return; 18673 } 18674 18675 /* We don't increment mac_ptr here, so this is just 18676 a look-ahead. */ 18677 next_type = read_1_byte (abfd, mac_ptr); 18678 if (next_type != 0) 18679 complaint (&symfile_complaints, 18680 _("no terminating 0-type entry for " 18681 "macros in `.debug_macinfo' section")); 18682 18683 return; 18684 } 18685 } 18686 break; 18687 18688 case DW_MACRO_GNU_transparent_include: 18689 case DW_MACRO_GNU_transparent_include_alt: 18690 { 18691 LONGEST offset; 18692 void **slot; 18693 bfd *include_bfd = abfd; 18694 struct dwarf2_section_info *include_section = section; 18695 struct dwarf2_section_info alt_section; 18696 gdb_byte *include_mac_end = mac_end; 18697 int is_dwz = section_is_dwz; 18698 gdb_byte *new_mac_ptr; 18699 18700 offset = read_offset_1 (abfd, mac_ptr, offset_size); 18701 mac_ptr += offset_size; 18702 18703 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt) 18704 { 18705 struct dwz_file *dwz = dwarf2_get_dwz_file (); 18706 18707 dwarf2_read_section (dwarf2_per_objfile->objfile, 18708 &dwz->macro); 18709 18710 include_bfd = dwz->macro.asection->owner; 18711 include_section = &dwz->macro; 18712 include_mac_end = dwz->macro.buffer + dwz->macro.size; 18713 is_dwz = 1; 18714 } 18715 18716 new_mac_ptr = include_section->buffer + offset; 18717 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT); 18718 18719 if (*slot != NULL) 18720 { 18721 /* This has actually happened; see 18722 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */ 18723 complaint (&symfile_complaints, 18724 _("recursive DW_MACRO_GNU_transparent_include in " 18725 ".debug_macro section")); 18726 } 18727 else 18728 { 18729 *slot = new_mac_ptr; 18730 18731 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr, 18732 include_mac_end, current_file, 18733 lh, comp_dir, 18734 section, section_is_gnu, is_dwz, 18735 offset_size, objfile, include_hash); 18736 18737 htab_remove_elt (include_hash, new_mac_ptr); 18738 } 18739 } 18740 break; 18741 18742 case DW_MACINFO_vendor_ext: 18743 if (!section_is_gnu) 18744 { 18745 unsigned int bytes_read; 18746 int constant; 18747 18748 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18749 mac_ptr += bytes_read; 18750 read_direct_string (abfd, mac_ptr, &bytes_read); 18751 mac_ptr += bytes_read; 18752 18753 /* We don't recognize any vendor extensions. */ 18754 break; 18755 } 18756 /* FALLTHROUGH */ 18757 18758 default: 18759 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions, 18760 mac_ptr, mac_end, abfd, offset_size, 18761 section); 18762 if (mac_ptr == NULL) 18763 return; 18764 break; 18765 } 18766 } while (macinfo_type != 0); 18767 } 18768 18769 static void 18770 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset, 18771 const char *comp_dir, int section_is_gnu) 18772 { 18773 struct objfile *objfile = dwarf2_per_objfile->objfile; 18774 struct line_header *lh = cu->line_header; 18775 bfd *abfd; 18776 gdb_byte *mac_ptr, *mac_end; 18777 struct macro_source_file *current_file = 0; 18778 enum dwarf_macro_record_type macinfo_type; 18779 unsigned int offset_size = cu->header.offset_size; 18780 gdb_byte *opcode_definitions[256]; 18781 struct cleanup *cleanup; 18782 htab_t include_hash; 18783 void **slot; 18784 struct dwarf2_section_info *section; 18785 const char *section_name; 18786 18787 if (cu->dwo_unit != NULL) 18788 { 18789 if (section_is_gnu) 18790 { 18791 section = &cu->dwo_unit->dwo_file->sections.macro; 18792 section_name = ".debug_macro.dwo"; 18793 } 18794 else 18795 { 18796 section = &cu->dwo_unit->dwo_file->sections.macinfo; 18797 section_name = ".debug_macinfo.dwo"; 18798 } 18799 } 18800 else 18801 { 18802 if (section_is_gnu) 18803 { 18804 section = &dwarf2_per_objfile->macro; 18805 section_name = ".debug_macro"; 18806 } 18807 else 18808 { 18809 section = &dwarf2_per_objfile->macinfo; 18810 section_name = ".debug_macinfo"; 18811 } 18812 } 18813 18814 dwarf2_read_section (objfile, section); 18815 if (section->buffer == NULL) 18816 { 18817 complaint (&symfile_complaints, _("missing %s section"), section_name); 18818 return; 18819 } 18820 abfd = section->asection->owner; 18821 18822 /* First pass: Find the name of the base filename. 18823 This filename is needed in order to process all macros whose definition 18824 (or undefinition) comes from the command line. These macros are defined 18825 before the first DW_MACINFO_start_file entry, and yet still need to be 18826 associated to the base file. 18827 18828 To determine the base file name, we scan the macro definitions until we 18829 reach the first DW_MACINFO_start_file entry. We then initialize 18830 CURRENT_FILE accordingly so that any macro definition found before the 18831 first DW_MACINFO_start_file can still be associated to the base file. */ 18832 18833 mac_ptr = section->buffer + offset; 18834 mac_end = section->buffer + section->size; 18835 18836 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr, 18837 &offset_size, section_is_gnu); 18838 if (mac_ptr == NULL) 18839 { 18840 /* We already issued a complaint. */ 18841 return; 18842 } 18843 18844 do 18845 { 18846 /* Do we at least have room for a macinfo type byte? */ 18847 if (mac_ptr >= mac_end) 18848 { 18849 /* Complaint is printed during the second pass as GDB will probably 18850 stop the first pass earlier upon finding 18851 DW_MACINFO_start_file. */ 18852 break; 18853 } 18854 18855 macinfo_type = read_1_byte (abfd, mac_ptr); 18856 mac_ptr++; 18857 18858 /* Note that we rely on the fact that the corresponding GNU and 18859 DWARF constants are the same. */ 18860 switch (macinfo_type) 18861 { 18862 /* A zero macinfo type indicates the end of the macro 18863 information. */ 18864 case 0: 18865 break; 18866 18867 case DW_MACRO_GNU_define: 18868 case DW_MACRO_GNU_undef: 18869 /* Only skip the data by MAC_PTR. */ 18870 { 18871 unsigned int bytes_read; 18872 18873 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18874 mac_ptr += bytes_read; 18875 read_direct_string (abfd, mac_ptr, &bytes_read); 18876 mac_ptr += bytes_read; 18877 } 18878 break; 18879 18880 case DW_MACRO_GNU_start_file: 18881 { 18882 unsigned int bytes_read; 18883 int line, file; 18884 18885 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18886 mac_ptr += bytes_read; 18887 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18888 mac_ptr += bytes_read; 18889 18890 current_file = macro_start_file (file, line, current_file, 18891 comp_dir, lh, objfile); 18892 } 18893 break; 18894 18895 case DW_MACRO_GNU_end_file: 18896 /* No data to skip by MAC_PTR. */ 18897 break; 18898 18899 case DW_MACRO_GNU_define_indirect: 18900 case DW_MACRO_GNU_undef_indirect: 18901 case DW_MACRO_GNU_define_indirect_alt: 18902 case DW_MACRO_GNU_undef_indirect_alt: 18903 { 18904 unsigned int bytes_read; 18905 18906 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18907 mac_ptr += bytes_read; 18908 mac_ptr += offset_size; 18909 } 18910 break; 18911 18912 case DW_MACRO_GNU_transparent_include: 18913 case DW_MACRO_GNU_transparent_include_alt: 18914 /* Note that, according to the spec, a transparent include 18915 chain cannot call DW_MACRO_GNU_start_file. So, we can just 18916 skip this opcode. */ 18917 mac_ptr += offset_size; 18918 break; 18919 18920 case DW_MACINFO_vendor_ext: 18921 /* Only skip the data by MAC_PTR. */ 18922 if (!section_is_gnu) 18923 { 18924 unsigned int bytes_read; 18925 18926 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 18927 mac_ptr += bytes_read; 18928 read_direct_string (abfd, mac_ptr, &bytes_read); 18929 mac_ptr += bytes_read; 18930 } 18931 /* FALLTHROUGH */ 18932 18933 default: 18934 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions, 18935 mac_ptr, mac_end, abfd, offset_size, 18936 section); 18937 if (mac_ptr == NULL) 18938 return; 18939 break; 18940 } 18941 } while (macinfo_type != 0 && current_file == NULL); 18942 18943 /* Second pass: Process all entries. 18944 18945 Use the AT_COMMAND_LINE flag to determine whether we are still processing 18946 command-line macro definitions/undefinitions. This flag is unset when we 18947 reach the first DW_MACINFO_start_file entry. */ 18948 18949 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer, 18950 NULL, xcalloc, xfree); 18951 cleanup = make_cleanup_htab_delete (include_hash); 18952 mac_ptr = section->buffer + offset; 18953 slot = htab_find_slot (include_hash, mac_ptr, INSERT); 18954 *slot = mac_ptr; 18955 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end, 18956 current_file, lh, comp_dir, section, 18957 section_is_gnu, 0, 18958 offset_size, objfile, include_hash); 18959 do_cleanups (cleanup); 18960 } 18961 18962 /* Check if the attribute's form is a DW_FORM_block* 18963 if so return true else false. */ 18964 18965 static int 18966 attr_form_is_block (struct attribute *attr) 18967 { 18968 return (attr == NULL ? 0 : 18969 attr->form == DW_FORM_block1 18970 || attr->form == DW_FORM_block2 18971 || attr->form == DW_FORM_block4 18972 || attr->form == DW_FORM_block 18973 || attr->form == DW_FORM_exprloc); 18974 } 18975 18976 /* Return non-zero if ATTR's value is a section offset --- classes 18977 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise. 18978 You may use DW_UNSND (attr) to retrieve such offsets. 18979 18980 Section 7.5.4, "Attribute Encodings", explains that no attribute 18981 may have a value that belongs to more than one of these classes; it 18982 would be ambiguous if we did, because we use the same forms for all 18983 of them. */ 18984 18985 static int 18986 attr_form_is_section_offset (struct attribute *attr) 18987 { 18988 return (attr->form == DW_FORM_data4 18989 || attr->form == DW_FORM_data8 18990 || attr->form == DW_FORM_sec_offset); 18991 } 18992 18993 /* Return non-zero if ATTR's value falls in the 'constant' class, or 18994 zero otherwise. When this function returns true, you can apply 18995 dwarf2_get_attr_constant_value to it. 18996 18997 However, note that for some attributes you must check 18998 attr_form_is_section_offset before using this test. DW_FORM_data4 18999 and DW_FORM_data8 are members of both the constant class, and of 19000 the classes that contain offsets into other debug sections 19001 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says 19002 that, if an attribute's can be either a constant or one of the 19003 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be 19004 taken as section offsets, not constants. */ 19005 19006 static int 19007 attr_form_is_constant (struct attribute *attr) 19008 { 19009 switch (attr->form) 19010 { 19011 case DW_FORM_sdata: 19012 case DW_FORM_udata: 19013 case DW_FORM_data1: 19014 case DW_FORM_data2: 19015 case DW_FORM_data4: 19016 case DW_FORM_data8: 19017 return 1; 19018 default: 19019 return 0; 19020 } 19021 } 19022 19023 /* Return the .debug_loc section to use for CU. 19024 For DWO files use .debug_loc.dwo. */ 19025 19026 static struct dwarf2_section_info * 19027 cu_debug_loc_section (struct dwarf2_cu *cu) 19028 { 19029 if (cu->dwo_unit) 19030 return &cu->dwo_unit->dwo_file->sections.loc; 19031 return &dwarf2_per_objfile->loc; 19032 } 19033 19034 /* A helper function that fills in a dwarf2_loclist_baton. */ 19035 19036 static void 19037 fill_in_loclist_baton (struct dwarf2_cu *cu, 19038 struct dwarf2_loclist_baton *baton, 19039 struct attribute *attr) 19040 { 19041 struct dwarf2_section_info *section = cu_debug_loc_section (cu); 19042 19043 dwarf2_read_section (dwarf2_per_objfile->objfile, section); 19044 19045 baton->per_cu = cu->per_cu; 19046 gdb_assert (baton->per_cu); 19047 /* We don't know how long the location list is, but make sure we 19048 don't run off the edge of the section. */ 19049 baton->size = section->size - DW_UNSND (attr); 19050 baton->data = section->buffer + DW_UNSND (attr); 19051 baton->base_address = cu->base_address; 19052 baton->from_dwo = cu->dwo_unit != NULL; 19053 } 19054 19055 static void 19056 dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym, 19057 struct dwarf2_cu *cu) 19058 { 19059 struct objfile *objfile = dwarf2_per_objfile->objfile; 19060 struct dwarf2_section_info *section = cu_debug_loc_section (cu); 19061 19062 if (attr_form_is_section_offset (attr) 19063 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside 19064 the section. If so, fall through to the complaint in the 19065 other branch. */ 19066 && DW_UNSND (attr) < dwarf2_section_size (objfile, section)) 19067 { 19068 struct dwarf2_loclist_baton *baton; 19069 19070 baton = obstack_alloc (&objfile->objfile_obstack, 19071 sizeof (struct dwarf2_loclist_baton)); 19072 19073 fill_in_loclist_baton (cu, baton, attr); 19074 19075 if (cu->base_known == 0) 19076 complaint (&symfile_complaints, 19077 _("Location list used without " 19078 "specifying the CU base address.")); 19079 19080 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_loclist_funcs; 19081 SYMBOL_LOCATION_BATON (sym) = baton; 19082 } 19083 else 19084 { 19085 struct dwarf2_locexpr_baton *baton; 19086 19087 baton = obstack_alloc (&objfile->objfile_obstack, 19088 sizeof (struct dwarf2_locexpr_baton)); 19089 baton->per_cu = cu->per_cu; 19090 gdb_assert (baton->per_cu); 19091 19092 if (attr_form_is_block (attr)) 19093 { 19094 /* Note that we're just copying the block's data pointer 19095 here, not the actual data. We're still pointing into the 19096 info_buffer for SYM's objfile; right now we never release 19097 that buffer, but when we do clean up properly this may 19098 need to change. */ 19099 baton->size = DW_BLOCK (attr)->size; 19100 baton->data = DW_BLOCK (attr)->data; 19101 } 19102 else 19103 { 19104 dwarf2_invalid_attrib_class_complaint ("location description", 19105 SYMBOL_NATURAL_NAME (sym)); 19106 baton->size = 0; 19107 } 19108 19109 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs; 19110 SYMBOL_LOCATION_BATON (sym) = baton; 19111 } 19112 } 19113 19114 /* Return the OBJFILE associated with the compilation unit CU. If CU 19115 came from a separate debuginfo file, then the master objfile is 19116 returned. */ 19117 19118 struct objfile * 19119 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu) 19120 { 19121 struct objfile *objfile = per_cu->objfile; 19122 19123 /* Return the master objfile, so that we can report and look up the 19124 correct file containing this variable. */ 19125 if (objfile->separate_debug_objfile_backlink) 19126 objfile = objfile->separate_debug_objfile_backlink; 19127 19128 return objfile; 19129 } 19130 19131 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU 19132 (CU_HEADERP is unused in such case) or prepare a temporary copy at 19133 CU_HEADERP first. */ 19134 19135 static const struct comp_unit_head * 19136 per_cu_header_read_in (struct comp_unit_head *cu_headerp, 19137 struct dwarf2_per_cu_data *per_cu) 19138 { 19139 gdb_byte *info_ptr; 19140 19141 if (per_cu->cu) 19142 return &per_cu->cu->header; 19143 19144 info_ptr = per_cu->info_or_types_section->buffer + per_cu->offset.sect_off; 19145 19146 memset (cu_headerp, 0, sizeof (*cu_headerp)); 19147 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd); 19148 19149 return cu_headerp; 19150 } 19151 19152 /* Return the address size given in the compilation unit header for CU. */ 19153 19154 int 19155 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu) 19156 { 19157 struct comp_unit_head cu_header_local; 19158 const struct comp_unit_head *cu_headerp; 19159 19160 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu); 19161 19162 return cu_headerp->addr_size; 19163 } 19164 19165 /* Return the offset size given in the compilation unit header for CU. */ 19166 19167 int 19168 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu) 19169 { 19170 struct comp_unit_head cu_header_local; 19171 const struct comp_unit_head *cu_headerp; 19172 19173 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu); 19174 19175 return cu_headerp->offset_size; 19176 } 19177 19178 /* See its dwarf2loc.h declaration. */ 19179 19180 int 19181 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu) 19182 { 19183 struct comp_unit_head cu_header_local; 19184 const struct comp_unit_head *cu_headerp; 19185 19186 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu); 19187 19188 if (cu_headerp->version == 2) 19189 return cu_headerp->addr_size; 19190 else 19191 return cu_headerp->offset_size; 19192 } 19193 19194 /* Return the text offset of the CU. The returned offset comes from 19195 this CU's objfile. If this objfile came from a separate debuginfo 19196 file, then the offset may be different from the corresponding 19197 offset in the parent objfile. */ 19198 19199 CORE_ADDR 19200 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu) 19201 { 19202 struct objfile *objfile = per_cu->objfile; 19203 19204 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 19205 } 19206 19207 /* Locate the .debug_info compilation unit from CU's objfile which contains 19208 the DIE at OFFSET. Raises an error on failure. */ 19209 19210 static struct dwarf2_per_cu_data * 19211 dwarf2_find_containing_comp_unit (sect_offset offset, 19212 unsigned int offset_in_dwz, 19213 struct objfile *objfile) 19214 { 19215 struct dwarf2_per_cu_data *this_cu; 19216 int low, high; 19217 const sect_offset *cu_off; 19218 19219 low = 0; 19220 high = dwarf2_per_objfile->n_comp_units - 1; 19221 while (high > low) 19222 { 19223 struct dwarf2_per_cu_data *mid_cu; 19224 int mid = low + (high - low) / 2; 19225 19226 mid_cu = dwarf2_per_objfile->all_comp_units[mid]; 19227 cu_off = &mid_cu->offset; 19228 if (mid_cu->is_dwz > offset_in_dwz 19229 || (mid_cu->is_dwz == offset_in_dwz 19230 && cu_off->sect_off >= offset.sect_off)) 19231 high = mid; 19232 else 19233 low = mid + 1; 19234 } 19235 gdb_assert (low == high); 19236 this_cu = dwarf2_per_objfile->all_comp_units[low]; 19237 cu_off = &this_cu->offset; 19238 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off) 19239 { 19240 if (low == 0 || this_cu->is_dwz != offset_in_dwz) 19241 error (_("Dwarf Error: could not find partial DIE containing " 19242 "offset 0x%lx [in module %s]"), 19243 (long) offset.sect_off, bfd_get_filename (objfile->obfd)); 19244 19245 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off 19246 <= offset.sect_off); 19247 return dwarf2_per_objfile->all_comp_units[low-1]; 19248 } 19249 else 19250 { 19251 this_cu = dwarf2_per_objfile->all_comp_units[low]; 19252 if (low == dwarf2_per_objfile->n_comp_units - 1 19253 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length) 19254 error (_("invalid dwarf2 offset %u"), offset.sect_off); 19255 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length); 19256 return this_cu; 19257 } 19258 } 19259 19260 /* Initialize dwarf2_cu CU, owned by PER_CU. */ 19261 19262 static void 19263 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu) 19264 { 19265 memset (cu, 0, sizeof (*cu)); 19266 per_cu->cu = cu; 19267 cu->per_cu = per_cu; 19268 cu->objfile = per_cu->objfile; 19269 obstack_init (&cu->comp_unit_obstack); 19270 } 19271 19272 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */ 19273 19274 static void 19275 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die, 19276 enum language pretend_language) 19277 { 19278 struct attribute *attr; 19279 19280 /* Set the language we're debugging. */ 19281 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu); 19282 if (attr) 19283 set_cu_language (DW_UNSND (attr), cu); 19284 else 19285 { 19286 cu->language = pretend_language; 19287 cu->language_defn = language_def (cu->language); 19288 } 19289 19290 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu); 19291 if (attr) 19292 cu->producer = DW_STRING (attr); 19293 } 19294 19295 /* Release one cached compilation unit, CU. We unlink it from the tree 19296 of compilation units, but we don't remove it from the read_in_chain; 19297 the caller is responsible for that. 19298 NOTE: DATA is a void * because this function is also used as a 19299 cleanup routine. */ 19300 19301 static void 19302 free_heap_comp_unit (void *data) 19303 { 19304 struct dwarf2_cu *cu = data; 19305 19306 gdb_assert (cu->per_cu != NULL); 19307 cu->per_cu->cu = NULL; 19308 cu->per_cu = NULL; 19309 19310 obstack_free (&cu->comp_unit_obstack, NULL); 19311 19312 xfree (cu); 19313 } 19314 19315 /* This cleanup function is passed the address of a dwarf2_cu on the stack 19316 when we're finished with it. We can't free the pointer itself, but be 19317 sure to unlink it from the cache. Also release any associated storage. */ 19318 19319 static void 19320 free_stack_comp_unit (void *data) 19321 { 19322 struct dwarf2_cu *cu = data; 19323 19324 gdb_assert (cu->per_cu != NULL); 19325 cu->per_cu->cu = NULL; 19326 cu->per_cu = NULL; 19327 19328 obstack_free (&cu->comp_unit_obstack, NULL); 19329 cu->partial_dies = NULL; 19330 } 19331 19332 /* Free all cached compilation units. */ 19333 19334 static void 19335 free_cached_comp_units (void *data) 19336 { 19337 struct dwarf2_per_cu_data *per_cu, **last_chain; 19338 19339 per_cu = dwarf2_per_objfile->read_in_chain; 19340 last_chain = &dwarf2_per_objfile->read_in_chain; 19341 while (per_cu != NULL) 19342 { 19343 struct dwarf2_per_cu_data *next_cu; 19344 19345 next_cu = per_cu->cu->read_in_chain; 19346 19347 free_heap_comp_unit (per_cu->cu); 19348 *last_chain = next_cu; 19349 19350 per_cu = next_cu; 19351 } 19352 } 19353 19354 /* Increase the age counter on each cached compilation unit, and free 19355 any that are too old. */ 19356 19357 static void 19358 age_cached_comp_units (void) 19359 { 19360 struct dwarf2_per_cu_data *per_cu, **last_chain; 19361 19362 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain); 19363 per_cu = dwarf2_per_objfile->read_in_chain; 19364 while (per_cu != NULL) 19365 { 19366 per_cu->cu->last_used ++; 19367 if (per_cu->cu->last_used <= dwarf2_max_cache_age) 19368 dwarf2_mark (per_cu->cu); 19369 per_cu = per_cu->cu->read_in_chain; 19370 } 19371 19372 per_cu = dwarf2_per_objfile->read_in_chain; 19373 last_chain = &dwarf2_per_objfile->read_in_chain; 19374 while (per_cu != NULL) 19375 { 19376 struct dwarf2_per_cu_data *next_cu; 19377 19378 next_cu = per_cu->cu->read_in_chain; 19379 19380 if (!per_cu->cu->mark) 19381 { 19382 free_heap_comp_unit (per_cu->cu); 19383 *last_chain = next_cu; 19384 } 19385 else 19386 last_chain = &per_cu->cu->read_in_chain; 19387 19388 per_cu = next_cu; 19389 } 19390 } 19391 19392 /* Remove a single compilation unit from the cache. */ 19393 19394 static void 19395 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu) 19396 { 19397 struct dwarf2_per_cu_data *per_cu, **last_chain; 19398 19399 per_cu = dwarf2_per_objfile->read_in_chain; 19400 last_chain = &dwarf2_per_objfile->read_in_chain; 19401 while (per_cu != NULL) 19402 { 19403 struct dwarf2_per_cu_data *next_cu; 19404 19405 next_cu = per_cu->cu->read_in_chain; 19406 19407 if (per_cu == target_per_cu) 19408 { 19409 free_heap_comp_unit (per_cu->cu); 19410 per_cu->cu = NULL; 19411 *last_chain = next_cu; 19412 break; 19413 } 19414 else 19415 last_chain = &per_cu->cu->read_in_chain; 19416 19417 per_cu = next_cu; 19418 } 19419 } 19420 19421 /* Release all extra memory associated with OBJFILE. */ 19422 19423 void 19424 dwarf2_free_objfile (struct objfile *objfile) 19425 { 19426 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key); 19427 19428 if (dwarf2_per_objfile == NULL) 19429 return; 19430 19431 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */ 19432 free_cached_comp_units (NULL); 19433 19434 if (dwarf2_per_objfile->quick_file_names_table) 19435 htab_delete (dwarf2_per_objfile->quick_file_names_table); 19436 19437 /* Everything else should be on the objfile obstack. */ 19438 } 19439 19440 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer. 19441 We store these in a hash table separate from the DIEs, and preserve them 19442 when the DIEs are flushed out of cache. 19443 19444 The CU "per_cu" pointer is needed because offset alone is not enough to 19445 uniquely identify the type. A file may have multiple .debug_types sections, 19446 or the type may come from a DWO file. We have to use something in 19447 dwarf2_per_cu_data (or the pointer to it) because we can enter the lookup 19448 routine, get_die_type_at_offset, from outside this file, and thus won't 19449 necessarily have PER_CU->cu. Fortunately, PER_CU is stable for the life 19450 of the objfile. */ 19451 19452 struct dwarf2_per_cu_offset_and_type 19453 { 19454 const struct dwarf2_per_cu_data *per_cu; 19455 sect_offset offset; 19456 struct type *type; 19457 }; 19458 19459 /* Hash function for a dwarf2_per_cu_offset_and_type. */ 19460 19461 static hashval_t 19462 per_cu_offset_and_type_hash (const void *item) 19463 { 19464 const struct dwarf2_per_cu_offset_and_type *ofs = item; 19465 19466 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off; 19467 } 19468 19469 /* Equality function for a dwarf2_per_cu_offset_and_type. */ 19470 19471 static int 19472 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs) 19473 { 19474 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs; 19475 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs; 19476 19477 return (ofs_lhs->per_cu == ofs_rhs->per_cu 19478 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off); 19479 } 19480 19481 /* Set the type associated with DIE to TYPE. Save it in CU's hash 19482 table if necessary. For convenience, return TYPE. 19483 19484 The DIEs reading must have careful ordering to: 19485 * Not cause infite loops trying to read in DIEs as a prerequisite for 19486 reading current DIE. 19487 * Not trying to dereference contents of still incompletely read in types 19488 while reading in other DIEs. 19489 * Enable referencing still incompletely read in types just by a pointer to 19490 the type without accessing its fields. 19491 19492 Therefore caller should follow these rules: 19493 * Try to fetch any prerequisite types we may need to build this DIE type 19494 before building the type and calling set_die_type. 19495 * After building type call set_die_type for current DIE as soon as 19496 possible before fetching more types to complete the current type. 19497 * Make the type as complete as possible before fetching more types. */ 19498 19499 static struct type * 19500 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu) 19501 { 19502 struct dwarf2_per_cu_offset_and_type **slot, ofs; 19503 struct objfile *objfile = cu->objfile; 19504 19505 /* For Ada types, make sure that the gnat-specific data is always 19506 initialized (if not already set). There are a few types where 19507 we should not be doing so, because the type-specific area is 19508 already used to hold some other piece of info (eg: TYPE_CODE_FLT 19509 where the type-specific area is used to store the floatformat). 19510 But this is not a problem, because the gnat-specific information 19511 is actually not needed for these types. */ 19512 if (need_gnat_info (cu) 19513 && TYPE_CODE (type) != TYPE_CODE_FUNC 19514 && TYPE_CODE (type) != TYPE_CODE_FLT 19515 && !HAVE_GNAT_AUX_INFO (type)) 19516 INIT_GNAT_SPECIFIC (type); 19517 19518 if (dwarf2_per_objfile->die_type_hash == NULL) 19519 { 19520 dwarf2_per_objfile->die_type_hash = 19521 htab_create_alloc_ex (127, 19522 per_cu_offset_and_type_hash, 19523 per_cu_offset_and_type_eq, 19524 NULL, 19525 &objfile->objfile_obstack, 19526 hashtab_obstack_allocate, 19527 dummy_obstack_deallocate); 19528 } 19529 19530 ofs.per_cu = cu->per_cu; 19531 ofs.offset = die->offset; 19532 ofs.type = type; 19533 slot = (struct dwarf2_per_cu_offset_and_type **) 19534 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT); 19535 if (*slot) 19536 complaint (&symfile_complaints, 19537 _("A problem internal to GDB: DIE 0x%x has type already set"), 19538 die->offset.sect_off); 19539 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot)); 19540 **slot = ofs; 19541 return type; 19542 } 19543 19544 /* Look up the type for the die at OFFSET in the appropriate type_hash 19545 table, or return NULL if the die does not have a saved type. */ 19546 19547 static struct type * 19548 get_die_type_at_offset (sect_offset offset, 19549 struct dwarf2_per_cu_data *per_cu) 19550 { 19551 struct dwarf2_per_cu_offset_and_type *slot, ofs; 19552 19553 if (dwarf2_per_objfile->die_type_hash == NULL) 19554 return NULL; 19555 19556 ofs.per_cu = per_cu; 19557 ofs.offset = offset; 19558 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs); 19559 if (slot) 19560 return slot->type; 19561 else 19562 return NULL; 19563 } 19564 19565 /* Look up the type for DIE in the appropriate type_hash table, 19566 or return NULL if DIE does not have a saved type. */ 19567 19568 static struct type * 19569 get_die_type (struct die_info *die, struct dwarf2_cu *cu) 19570 { 19571 return get_die_type_at_offset (die->offset, cu->per_cu); 19572 } 19573 19574 /* Add a dependence relationship from CU to REF_PER_CU. */ 19575 19576 static void 19577 dwarf2_add_dependence (struct dwarf2_cu *cu, 19578 struct dwarf2_per_cu_data *ref_per_cu) 19579 { 19580 void **slot; 19581 19582 if (cu->dependencies == NULL) 19583 cu->dependencies 19584 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer, 19585 NULL, &cu->comp_unit_obstack, 19586 hashtab_obstack_allocate, 19587 dummy_obstack_deallocate); 19588 19589 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT); 19590 if (*slot == NULL) 19591 *slot = ref_per_cu; 19592 } 19593 19594 /* Subroutine of dwarf2_mark to pass to htab_traverse. 19595 Set the mark field in every compilation unit in the 19596 cache that we must keep because we are keeping CU. */ 19597 19598 static int 19599 dwarf2_mark_helper (void **slot, void *data) 19600 { 19601 struct dwarf2_per_cu_data *per_cu; 19602 19603 per_cu = (struct dwarf2_per_cu_data *) *slot; 19604 19605 /* cu->dependencies references may not yet have been ever read if QUIT aborts 19606 reading of the chain. As such dependencies remain valid it is not much 19607 useful to track and undo them during QUIT cleanups. */ 19608 if (per_cu->cu == NULL) 19609 return 1; 19610 19611 if (per_cu->cu->mark) 19612 return 1; 19613 per_cu->cu->mark = 1; 19614 19615 if (per_cu->cu->dependencies != NULL) 19616 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL); 19617 19618 return 1; 19619 } 19620 19621 /* Set the mark field in CU and in every other compilation unit in the 19622 cache that we must keep because we are keeping CU. */ 19623 19624 static void 19625 dwarf2_mark (struct dwarf2_cu *cu) 19626 { 19627 if (cu->mark) 19628 return; 19629 cu->mark = 1; 19630 if (cu->dependencies != NULL) 19631 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL); 19632 } 19633 19634 static void 19635 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu) 19636 { 19637 while (per_cu) 19638 { 19639 per_cu->cu->mark = 0; 19640 per_cu = per_cu->cu->read_in_chain; 19641 } 19642 } 19643 19644 /* Trivial hash function for partial_die_info: the hash value of a DIE 19645 is its offset in .debug_info for this objfile. */ 19646 19647 static hashval_t 19648 partial_die_hash (const void *item) 19649 { 19650 const struct partial_die_info *part_die = item; 19651 19652 return part_die->offset.sect_off; 19653 } 19654 19655 /* Trivial comparison function for partial_die_info structures: two DIEs 19656 are equal if they have the same offset. */ 19657 19658 static int 19659 partial_die_eq (const void *item_lhs, const void *item_rhs) 19660 { 19661 const struct partial_die_info *part_die_lhs = item_lhs; 19662 const struct partial_die_info *part_die_rhs = item_rhs; 19663 19664 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off; 19665 } 19666 19667 static struct cmd_list_element *set_dwarf2_cmdlist; 19668 static struct cmd_list_element *show_dwarf2_cmdlist; 19669 19670 static void 19671 set_dwarf2_cmd (char *args, int from_tty) 19672 { 19673 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout); 19674 } 19675 19676 static void 19677 show_dwarf2_cmd (char *args, int from_tty) 19678 { 19679 cmd_show_list (show_dwarf2_cmdlist, from_tty, ""); 19680 } 19681 19682 /* Free data associated with OBJFILE, if necessary. */ 19683 19684 static void 19685 dwarf2_per_objfile_free (struct objfile *objfile, void *d) 19686 { 19687 struct dwarf2_per_objfile *data = d; 19688 int ix; 19689 19690 for (ix = 0; ix < dwarf2_per_objfile->n_comp_units; ++ix) 19691 VEC_free (dwarf2_per_cu_ptr, 19692 dwarf2_per_objfile->all_comp_units[ix]->imported_symtabs); 19693 19694 for (ix = 0; ix < dwarf2_per_objfile->n_type_units; ++ix) 19695 VEC_free (dwarf2_per_cu_ptr, 19696 dwarf2_per_objfile->all_type_units[ix]->per_cu.imported_symtabs); 19697 19698 VEC_free (dwarf2_section_info_def, data->types); 19699 19700 if (data->dwo_files) 19701 free_dwo_files (data->dwo_files, objfile); 19702 if (data->dwp_file) 19703 gdb_bfd_unref (data->dwp_file->dbfd); 19704 19705 if (data->dwz_file && data->dwz_file->dwz_bfd) 19706 gdb_bfd_unref (data->dwz_file->dwz_bfd); 19707 } 19708 19709 19710 /* The "save gdb-index" command. */ 19711 19712 /* The contents of the hash table we create when building the string 19713 table. */ 19714 struct strtab_entry 19715 { 19716 offset_type offset; 19717 const char *str; 19718 }; 19719 19720 /* Hash function for a strtab_entry. 19721 19722 Function is used only during write_hash_table so no index format backward 19723 compatibility is needed. */ 19724 19725 static hashval_t 19726 hash_strtab_entry (const void *e) 19727 { 19728 const struct strtab_entry *entry = e; 19729 return mapped_index_string_hash (INT_MAX, entry->str); 19730 } 19731 19732 /* Equality function for a strtab_entry. */ 19733 19734 static int 19735 eq_strtab_entry (const void *a, const void *b) 19736 { 19737 const struct strtab_entry *ea = a; 19738 const struct strtab_entry *eb = b; 19739 return !strcmp (ea->str, eb->str); 19740 } 19741 19742 /* Create a strtab_entry hash table. */ 19743 19744 static htab_t 19745 create_strtab (void) 19746 { 19747 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry, 19748 xfree, xcalloc, xfree); 19749 } 19750 19751 /* Add a string to the constant pool. Return the string's offset in 19752 host order. */ 19753 19754 static offset_type 19755 add_string (htab_t table, struct obstack *cpool, const char *str) 19756 { 19757 void **slot; 19758 struct strtab_entry entry; 19759 struct strtab_entry *result; 19760 19761 entry.str = str; 19762 slot = htab_find_slot (table, &entry, INSERT); 19763 if (*slot) 19764 result = *slot; 19765 else 19766 { 19767 result = XNEW (struct strtab_entry); 19768 result->offset = obstack_object_size (cpool); 19769 result->str = str; 19770 obstack_grow_str0 (cpool, str); 19771 *slot = result; 19772 } 19773 return result->offset; 19774 } 19775 19776 /* An entry in the symbol table. */ 19777 struct symtab_index_entry 19778 { 19779 /* The name of the symbol. */ 19780 const char *name; 19781 /* The offset of the name in the constant pool. */ 19782 offset_type index_offset; 19783 /* A sorted vector of the indices of all the CUs that hold an object 19784 of this name. */ 19785 VEC (offset_type) *cu_indices; 19786 }; 19787 19788 /* The symbol table. This is a power-of-2-sized hash table. */ 19789 struct mapped_symtab 19790 { 19791 offset_type n_elements; 19792 offset_type size; 19793 struct symtab_index_entry **data; 19794 }; 19795 19796 /* Hash function for a symtab_index_entry. */ 19797 19798 static hashval_t 19799 hash_symtab_entry (const void *e) 19800 { 19801 const struct symtab_index_entry *entry = e; 19802 return iterative_hash (VEC_address (offset_type, entry->cu_indices), 19803 sizeof (offset_type) * VEC_length (offset_type, 19804 entry->cu_indices), 19805 0); 19806 } 19807 19808 /* Equality function for a symtab_index_entry. */ 19809 19810 static int 19811 eq_symtab_entry (const void *a, const void *b) 19812 { 19813 const struct symtab_index_entry *ea = a; 19814 const struct symtab_index_entry *eb = b; 19815 int len = VEC_length (offset_type, ea->cu_indices); 19816 if (len != VEC_length (offset_type, eb->cu_indices)) 19817 return 0; 19818 return !memcmp (VEC_address (offset_type, ea->cu_indices), 19819 VEC_address (offset_type, eb->cu_indices), 19820 sizeof (offset_type) * len); 19821 } 19822 19823 /* Destroy a symtab_index_entry. */ 19824 19825 static void 19826 delete_symtab_entry (void *p) 19827 { 19828 struct symtab_index_entry *entry = p; 19829 VEC_free (offset_type, entry->cu_indices); 19830 xfree (entry); 19831 } 19832 19833 /* Create a hash table holding symtab_index_entry objects. */ 19834 19835 static htab_t 19836 create_symbol_hash_table (void) 19837 { 19838 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry, 19839 delete_symtab_entry, xcalloc, xfree); 19840 } 19841 19842 /* Create a new mapped symtab object. */ 19843 19844 static struct mapped_symtab * 19845 create_mapped_symtab (void) 19846 { 19847 struct mapped_symtab *symtab = XNEW (struct mapped_symtab); 19848 symtab->n_elements = 0; 19849 symtab->size = 1024; 19850 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size); 19851 return symtab; 19852 } 19853 19854 /* Destroy a mapped_symtab. */ 19855 19856 static void 19857 cleanup_mapped_symtab (void *p) 19858 { 19859 struct mapped_symtab *symtab = p; 19860 /* The contents of the array are freed when the other hash table is 19861 destroyed. */ 19862 xfree (symtab->data); 19863 xfree (symtab); 19864 } 19865 19866 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to 19867 the slot. 19868 19869 Function is used only during write_hash_table so no index format backward 19870 compatibility is needed. */ 19871 19872 static struct symtab_index_entry ** 19873 find_slot (struct mapped_symtab *symtab, const char *name) 19874 { 19875 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name); 19876 19877 index = hash & (symtab->size - 1); 19878 step = ((hash * 17) & (symtab->size - 1)) | 1; 19879 19880 for (;;) 19881 { 19882 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name)) 19883 return &symtab->data[index]; 19884 index = (index + step) & (symtab->size - 1); 19885 } 19886 } 19887 19888 /* Expand SYMTAB's hash table. */ 19889 19890 static void 19891 hash_expand (struct mapped_symtab *symtab) 19892 { 19893 offset_type old_size = symtab->size; 19894 offset_type i; 19895 struct symtab_index_entry **old_entries = symtab->data; 19896 19897 symtab->size *= 2; 19898 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size); 19899 19900 for (i = 0; i < old_size; ++i) 19901 { 19902 if (old_entries[i]) 19903 { 19904 struct symtab_index_entry **slot = find_slot (symtab, 19905 old_entries[i]->name); 19906 *slot = old_entries[i]; 19907 } 19908 } 19909 19910 xfree (old_entries); 19911 } 19912 19913 /* Add an entry to SYMTAB. NAME is the name of the symbol. 19914 CU_INDEX is the index of the CU in which the symbol appears. 19915 IS_STATIC is one if the symbol is static, otherwise zero (global). */ 19916 19917 static void 19918 add_index_entry (struct mapped_symtab *symtab, const char *name, 19919 int is_static, gdb_index_symbol_kind kind, 19920 offset_type cu_index) 19921 { 19922 struct symtab_index_entry **slot; 19923 offset_type cu_index_and_attrs; 19924 19925 ++symtab->n_elements; 19926 if (4 * symtab->n_elements / 3 >= symtab->size) 19927 hash_expand (symtab); 19928 19929 slot = find_slot (symtab, name); 19930 if (!*slot) 19931 { 19932 *slot = XNEW (struct symtab_index_entry); 19933 (*slot)->name = name; 19934 /* index_offset is set later. */ 19935 (*slot)->cu_indices = NULL; 19936 } 19937 19938 cu_index_and_attrs = 0; 19939 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index); 19940 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static); 19941 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind); 19942 19943 /* We don't want to record an index value twice as we want to avoid the 19944 duplication. 19945 We process all global symbols and then all static symbols 19946 (which would allow us to avoid the duplication by only having to check 19947 the last entry pushed), but a symbol could have multiple kinds in one CU. 19948 To keep things simple we don't worry about the duplication here and 19949 sort and uniqufy the list after we've processed all symbols. */ 19950 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs); 19951 } 19952 19953 /* qsort helper routine for uniquify_cu_indices. */ 19954 19955 static int 19956 offset_type_compare (const void *ap, const void *bp) 19957 { 19958 offset_type a = *(offset_type *) ap; 19959 offset_type b = *(offset_type *) bp; 19960 19961 return (a > b) - (b > a); 19962 } 19963 19964 /* Sort and remove duplicates of all symbols' cu_indices lists. */ 19965 19966 static void 19967 uniquify_cu_indices (struct mapped_symtab *symtab) 19968 { 19969 int i; 19970 19971 for (i = 0; i < symtab->size; ++i) 19972 { 19973 struct symtab_index_entry *entry = symtab->data[i]; 19974 19975 if (entry 19976 && entry->cu_indices != NULL) 19977 { 19978 unsigned int next_to_insert, next_to_check; 19979 offset_type last_value; 19980 19981 qsort (VEC_address (offset_type, entry->cu_indices), 19982 VEC_length (offset_type, entry->cu_indices), 19983 sizeof (offset_type), offset_type_compare); 19984 19985 last_value = VEC_index (offset_type, entry->cu_indices, 0); 19986 next_to_insert = 1; 19987 for (next_to_check = 1; 19988 next_to_check < VEC_length (offset_type, entry->cu_indices); 19989 ++next_to_check) 19990 { 19991 if (VEC_index (offset_type, entry->cu_indices, next_to_check) 19992 != last_value) 19993 { 19994 last_value = VEC_index (offset_type, entry->cu_indices, 19995 next_to_check); 19996 VEC_replace (offset_type, entry->cu_indices, next_to_insert, 19997 last_value); 19998 ++next_to_insert; 19999 } 20000 } 20001 VEC_truncate (offset_type, entry->cu_indices, next_to_insert); 20002 } 20003 } 20004 } 20005 20006 /* Add a vector of indices to the constant pool. */ 20007 20008 static offset_type 20009 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool, 20010 struct symtab_index_entry *entry) 20011 { 20012 void **slot; 20013 20014 slot = htab_find_slot (symbol_hash_table, entry, INSERT); 20015 if (!*slot) 20016 { 20017 offset_type len = VEC_length (offset_type, entry->cu_indices); 20018 offset_type val = MAYBE_SWAP (len); 20019 offset_type iter; 20020 int i; 20021 20022 *slot = entry; 20023 entry->index_offset = obstack_object_size (cpool); 20024 20025 obstack_grow (cpool, &val, sizeof (val)); 20026 for (i = 0; 20027 VEC_iterate (offset_type, entry->cu_indices, i, iter); 20028 ++i) 20029 { 20030 val = MAYBE_SWAP (iter); 20031 obstack_grow (cpool, &val, sizeof (val)); 20032 } 20033 } 20034 else 20035 { 20036 struct symtab_index_entry *old_entry = *slot; 20037 entry->index_offset = old_entry->index_offset; 20038 entry = old_entry; 20039 } 20040 return entry->index_offset; 20041 } 20042 20043 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with 20044 constant pool entries going into the obstack CPOOL. */ 20045 20046 static void 20047 write_hash_table (struct mapped_symtab *symtab, 20048 struct obstack *output, struct obstack *cpool) 20049 { 20050 offset_type i; 20051 htab_t symbol_hash_table; 20052 htab_t str_table; 20053 20054 symbol_hash_table = create_symbol_hash_table (); 20055 str_table = create_strtab (); 20056 20057 /* We add all the index vectors to the constant pool first, to 20058 ensure alignment is ok. */ 20059 for (i = 0; i < symtab->size; ++i) 20060 { 20061 if (symtab->data[i]) 20062 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]); 20063 } 20064 20065 /* Now write out the hash table. */ 20066 for (i = 0; i < symtab->size; ++i) 20067 { 20068 offset_type str_off, vec_off; 20069 20070 if (symtab->data[i]) 20071 { 20072 str_off = add_string (str_table, cpool, symtab->data[i]->name); 20073 vec_off = symtab->data[i]->index_offset; 20074 } 20075 else 20076 { 20077 /* While 0 is a valid constant pool index, it is not valid 20078 to have 0 for both offsets. */ 20079 str_off = 0; 20080 vec_off = 0; 20081 } 20082 20083 str_off = MAYBE_SWAP (str_off); 20084 vec_off = MAYBE_SWAP (vec_off); 20085 20086 obstack_grow (output, &str_off, sizeof (str_off)); 20087 obstack_grow (output, &vec_off, sizeof (vec_off)); 20088 } 20089 20090 htab_delete (str_table); 20091 htab_delete (symbol_hash_table); 20092 } 20093 20094 /* Struct to map psymtab to CU index in the index file. */ 20095 struct psymtab_cu_index_map 20096 { 20097 struct partial_symtab *psymtab; 20098 unsigned int cu_index; 20099 }; 20100 20101 static hashval_t 20102 hash_psymtab_cu_index (const void *item) 20103 { 20104 const struct psymtab_cu_index_map *map = item; 20105 20106 return htab_hash_pointer (map->psymtab); 20107 } 20108 20109 static int 20110 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs) 20111 { 20112 const struct psymtab_cu_index_map *lhs = item_lhs; 20113 const struct psymtab_cu_index_map *rhs = item_rhs; 20114 20115 return lhs->psymtab == rhs->psymtab; 20116 } 20117 20118 /* Helper struct for building the address table. */ 20119 struct addrmap_index_data 20120 { 20121 struct objfile *objfile; 20122 struct obstack *addr_obstack; 20123 htab_t cu_index_htab; 20124 20125 /* Non-zero if the previous_* fields are valid. 20126 We can't write an entry until we see the next entry (since it is only then 20127 that we know the end of the entry). */ 20128 int previous_valid; 20129 /* Index of the CU in the table of all CUs in the index file. */ 20130 unsigned int previous_cu_index; 20131 /* Start address of the CU. */ 20132 CORE_ADDR previous_cu_start; 20133 }; 20134 20135 /* Write an address entry to OBSTACK. */ 20136 20137 static void 20138 add_address_entry (struct objfile *objfile, struct obstack *obstack, 20139 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index) 20140 { 20141 offset_type cu_index_to_write; 20142 char addr[8]; 20143 CORE_ADDR baseaddr; 20144 20145 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 20146 20147 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr); 20148 obstack_grow (obstack, addr, 8); 20149 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr); 20150 obstack_grow (obstack, addr, 8); 20151 cu_index_to_write = MAYBE_SWAP (cu_index); 20152 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type)); 20153 } 20154 20155 /* Worker function for traversing an addrmap to build the address table. */ 20156 20157 static int 20158 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj) 20159 { 20160 struct addrmap_index_data *data = datap; 20161 struct partial_symtab *pst = obj; 20162 20163 if (data->previous_valid) 20164 add_address_entry (data->objfile, data->addr_obstack, 20165 data->previous_cu_start, start_addr, 20166 data->previous_cu_index); 20167 20168 data->previous_cu_start = start_addr; 20169 if (pst != NULL) 20170 { 20171 struct psymtab_cu_index_map find_map, *map; 20172 find_map.psymtab = pst; 20173 map = htab_find (data->cu_index_htab, &find_map); 20174 gdb_assert (map != NULL); 20175 data->previous_cu_index = map->cu_index; 20176 data->previous_valid = 1; 20177 } 20178 else 20179 data->previous_valid = 0; 20180 20181 return 0; 20182 } 20183 20184 /* Write OBJFILE's address map to OBSTACK. 20185 CU_INDEX_HTAB is used to map addrmap entries to their CU indices 20186 in the index file. */ 20187 20188 static void 20189 write_address_map (struct objfile *objfile, struct obstack *obstack, 20190 htab_t cu_index_htab) 20191 { 20192 struct addrmap_index_data addrmap_index_data; 20193 20194 /* When writing the address table, we have to cope with the fact that 20195 the addrmap iterator only provides the start of a region; we have to 20196 wait until the next invocation to get the start of the next region. */ 20197 20198 addrmap_index_data.objfile = objfile; 20199 addrmap_index_data.addr_obstack = obstack; 20200 addrmap_index_data.cu_index_htab = cu_index_htab; 20201 addrmap_index_data.previous_valid = 0; 20202 20203 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker, 20204 &addrmap_index_data); 20205 20206 /* It's highly unlikely the last entry (end address = 0xff...ff) 20207 is valid, but we should still handle it. 20208 The end address is recorded as the start of the next region, but that 20209 doesn't work here. To cope we pass 0xff...ff, this is a rare situation 20210 anyway. */ 20211 if (addrmap_index_data.previous_valid) 20212 add_address_entry (objfile, obstack, 20213 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1, 20214 addrmap_index_data.previous_cu_index); 20215 } 20216 20217 /* Return the symbol kind of PSYM. */ 20218 20219 static gdb_index_symbol_kind 20220 symbol_kind (struct partial_symbol *psym) 20221 { 20222 domain_enum domain = PSYMBOL_DOMAIN (psym); 20223 enum address_class aclass = PSYMBOL_CLASS (psym); 20224 20225 switch (domain) 20226 { 20227 case VAR_DOMAIN: 20228 switch (aclass) 20229 { 20230 case LOC_BLOCK: 20231 return GDB_INDEX_SYMBOL_KIND_FUNCTION; 20232 case LOC_TYPEDEF: 20233 return GDB_INDEX_SYMBOL_KIND_TYPE; 20234 case LOC_COMPUTED: 20235 case LOC_CONST_BYTES: 20236 case LOC_OPTIMIZED_OUT: 20237 case LOC_STATIC: 20238 return GDB_INDEX_SYMBOL_KIND_VARIABLE; 20239 case LOC_CONST: 20240 /* Note: It's currently impossible to recognize psyms as enum values 20241 short of reading the type info. For now punt. */ 20242 return GDB_INDEX_SYMBOL_KIND_VARIABLE; 20243 default: 20244 /* There are other LOC_FOO values that one might want to classify 20245 as variables, but dwarf2read.c doesn't currently use them. */ 20246 return GDB_INDEX_SYMBOL_KIND_OTHER; 20247 } 20248 case STRUCT_DOMAIN: 20249 return GDB_INDEX_SYMBOL_KIND_TYPE; 20250 default: 20251 return GDB_INDEX_SYMBOL_KIND_OTHER; 20252 } 20253 } 20254 20255 /* Add a list of partial symbols to SYMTAB. */ 20256 20257 static void 20258 write_psymbols (struct mapped_symtab *symtab, 20259 htab_t psyms_seen, 20260 struct partial_symbol **psymp, 20261 int count, 20262 offset_type cu_index, 20263 int is_static) 20264 { 20265 for (; count-- > 0; ++psymp) 20266 { 20267 struct partial_symbol *psym = *psymp; 20268 void **slot; 20269 20270 if (SYMBOL_LANGUAGE (psym) == language_ada) 20271 error (_("Ada is not currently supported by the index")); 20272 20273 /* Only add a given psymbol once. */ 20274 slot = htab_find_slot (psyms_seen, psym, INSERT); 20275 if (!*slot) 20276 { 20277 gdb_index_symbol_kind kind = symbol_kind (psym); 20278 20279 *slot = psym; 20280 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym), 20281 is_static, kind, cu_index); 20282 } 20283 } 20284 } 20285 20286 /* Write the contents of an ("unfinished") obstack to FILE. Throw an 20287 exception if there is an error. */ 20288 20289 static void 20290 write_obstack (FILE *file, struct obstack *obstack) 20291 { 20292 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack), 20293 file) 20294 != obstack_object_size (obstack)) 20295 error (_("couldn't data write to file")); 20296 } 20297 20298 /* Unlink a file if the argument is not NULL. */ 20299 20300 static void 20301 unlink_if_set (void *p) 20302 { 20303 char **filename = p; 20304 if (*filename) 20305 unlink (*filename); 20306 } 20307 20308 /* A helper struct used when iterating over debug_types. */ 20309 struct signatured_type_index_data 20310 { 20311 struct objfile *objfile; 20312 struct mapped_symtab *symtab; 20313 struct obstack *types_list; 20314 htab_t psyms_seen; 20315 int cu_index; 20316 }; 20317 20318 /* A helper function that writes a single signatured_type to an 20319 obstack. */ 20320 20321 static int 20322 write_one_signatured_type (void **slot, void *d) 20323 { 20324 struct signatured_type_index_data *info = d; 20325 struct signatured_type *entry = (struct signatured_type *) *slot; 20326 struct dwarf2_per_cu_data *per_cu = &entry->per_cu; 20327 struct partial_symtab *psymtab = per_cu->v.psymtab; 20328 gdb_byte val[8]; 20329 20330 write_psymbols (info->symtab, 20331 info->psyms_seen, 20332 info->objfile->global_psymbols.list 20333 + psymtab->globals_offset, 20334 psymtab->n_global_syms, info->cu_index, 20335 0); 20336 write_psymbols (info->symtab, 20337 info->psyms_seen, 20338 info->objfile->static_psymbols.list 20339 + psymtab->statics_offset, 20340 psymtab->n_static_syms, info->cu_index, 20341 1); 20342 20343 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, 20344 entry->per_cu.offset.sect_off); 20345 obstack_grow (info->types_list, val, 8); 20346 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, 20347 entry->type_offset_in_tu.cu_off); 20348 obstack_grow (info->types_list, val, 8); 20349 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature); 20350 obstack_grow (info->types_list, val, 8); 20351 20352 ++info->cu_index; 20353 20354 return 1; 20355 } 20356 20357 /* Recurse into all "included" dependencies and write their symbols as 20358 if they appeared in this psymtab. */ 20359 20360 static void 20361 recursively_write_psymbols (struct objfile *objfile, 20362 struct partial_symtab *psymtab, 20363 struct mapped_symtab *symtab, 20364 htab_t psyms_seen, 20365 offset_type cu_index) 20366 { 20367 int i; 20368 20369 for (i = 0; i < psymtab->number_of_dependencies; ++i) 20370 if (psymtab->dependencies[i]->user != NULL) 20371 recursively_write_psymbols (objfile, psymtab->dependencies[i], 20372 symtab, psyms_seen, cu_index); 20373 20374 write_psymbols (symtab, 20375 psyms_seen, 20376 objfile->global_psymbols.list + psymtab->globals_offset, 20377 psymtab->n_global_syms, cu_index, 20378 0); 20379 write_psymbols (symtab, 20380 psyms_seen, 20381 objfile->static_psymbols.list + psymtab->statics_offset, 20382 psymtab->n_static_syms, cu_index, 20383 1); 20384 } 20385 20386 /* Create an index file for OBJFILE in the directory DIR. */ 20387 20388 static void 20389 write_psymtabs_to_index (struct objfile *objfile, const char *dir) 20390 { 20391 struct cleanup *cleanup; 20392 char *filename, *cleanup_filename; 20393 struct obstack contents, addr_obstack, constant_pool, symtab_obstack; 20394 struct obstack cu_list, types_cu_list; 20395 int i; 20396 FILE *out_file; 20397 struct mapped_symtab *symtab; 20398 offset_type val, size_of_contents, total_len; 20399 struct stat st; 20400 htab_t psyms_seen; 20401 htab_t cu_index_htab; 20402 struct psymtab_cu_index_map *psymtab_cu_index_map; 20403 20404 if (!objfile->psymtabs || !objfile->psymtabs_addrmap) 20405 return; 20406 20407 if (dwarf2_per_objfile->using_index) 20408 error (_("Cannot use an index to create the index")); 20409 20410 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1) 20411 error (_("Cannot make an index when the file has multiple .debug_types sections")); 20412 20413 if (stat (objfile->name, &st) < 0) 20414 perror_with_name (objfile->name); 20415 20416 filename = concat (dir, SLASH_STRING, lbasename (objfile->name), 20417 INDEX_SUFFIX, (char *) NULL); 20418 cleanup = make_cleanup (xfree, filename); 20419 20420 out_file = fopen (filename, "wb"); 20421 if (!out_file) 20422 error (_("Can't open `%s' for writing"), filename); 20423 20424 cleanup_filename = filename; 20425 make_cleanup (unlink_if_set, &cleanup_filename); 20426 20427 symtab = create_mapped_symtab (); 20428 make_cleanup (cleanup_mapped_symtab, symtab); 20429 20430 obstack_init (&addr_obstack); 20431 make_cleanup_obstack_free (&addr_obstack); 20432 20433 obstack_init (&cu_list); 20434 make_cleanup_obstack_free (&cu_list); 20435 20436 obstack_init (&types_cu_list); 20437 make_cleanup_obstack_free (&types_cu_list); 20438 20439 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer, 20440 NULL, xcalloc, xfree); 20441 make_cleanup_htab_delete (psyms_seen); 20442 20443 /* While we're scanning CU's create a table that maps a psymtab pointer 20444 (which is what addrmap records) to its index (which is what is recorded 20445 in the index file). This will later be needed to write the address 20446 table. */ 20447 cu_index_htab = htab_create_alloc (100, 20448 hash_psymtab_cu_index, 20449 eq_psymtab_cu_index, 20450 NULL, xcalloc, xfree); 20451 make_cleanup_htab_delete (cu_index_htab); 20452 psymtab_cu_index_map = (struct psymtab_cu_index_map *) 20453 xmalloc (sizeof (struct psymtab_cu_index_map) 20454 * dwarf2_per_objfile->n_comp_units); 20455 make_cleanup (xfree, psymtab_cu_index_map); 20456 20457 /* The CU list is already sorted, so we don't need to do additional 20458 work here. Also, the debug_types entries do not appear in 20459 all_comp_units, but only in their own hash table. */ 20460 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) 20461 { 20462 struct dwarf2_per_cu_data *per_cu 20463 = dwarf2_per_objfile->all_comp_units[i]; 20464 struct partial_symtab *psymtab = per_cu->v.psymtab; 20465 gdb_byte val[8]; 20466 struct psymtab_cu_index_map *map; 20467 void **slot; 20468 20469 if (psymtab->user == NULL) 20470 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i); 20471 20472 map = &psymtab_cu_index_map[i]; 20473 map->psymtab = psymtab; 20474 map->cu_index = i; 20475 slot = htab_find_slot (cu_index_htab, map, INSERT); 20476 gdb_assert (slot != NULL); 20477 gdb_assert (*slot == NULL); 20478 *slot = map; 20479 20480 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, 20481 per_cu->offset.sect_off); 20482 obstack_grow (&cu_list, val, 8); 20483 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length); 20484 obstack_grow (&cu_list, val, 8); 20485 } 20486 20487 /* Dump the address map. */ 20488 write_address_map (objfile, &addr_obstack, cu_index_htab); 20489 20490 /* Write out the .debug_type entries, if any. */ 20491 if (dwarf2_per_objfile->signatured_types) 20492 { 20493 struct signatured_type_index_data sig_data; 20494 20495 sig_data.objfile = objfile; 20496 sig_data.symtab = symtab; 20497 sig_data.types_list = &types_cu_list; 20498 sig_data.psyms_seen = psyms_seen; 20499 sig_data.cu_index = dwarf2_per_objfile->n_comp_units; 20500 htab_traverse_noresize (dwarf2_per_objfile->signatured_types, 20501 write_one_signatured_type, &sig_data); 20502 } 20503 20504 /* Now that we've processed all symbols we can shrink their cu_indices 20505 lists. */ 20506 uniquify_cu_indices (symtab); 20507 20508 obstack_init (&constant_pool); 20509 make_cleanup_obstack_free (&constant_pool); 20510 obstack_init (&symtab_obstack); 20511 make_cleanup_obstack_free (&symtab_obstack); 20512 write_hash_table (symtab, &symtab_obstack, &constant_pool); 20513 20514 obstack_init (&contents); 20515 make_cleanup_obstack_free (&contents); 20516 size_of_contents = 6 * sizeof (offset_type); 20517 total_len = size_of_contents; 20518 20519 /* The version number. */ 20520 val = MAYBE_SWAP (8); 20521 obstack_grow (&contents, &val, sizeof (val)); 20522 20523 /* The offset of the CU list from the start of the file. */ 20524 val = MAYBE_SWAP (total_len); 20525 obstack_grow (&contents, &val, sizeof (val)); 20526 total_len += obstack_object_size (&cu_list); 20527 20528 /* The offset of the types CU list from the start of the file. */ 20529 val = MAYBE_SWAP (total_len); 20530 obstack_grow (&contents, &val, sizeof (val)); 20531 total_len += obstack_object_size (&types_cu_list); 20532 20533 /* The offset of the address table from the start of the file. */ 20534 val = MAYBE_SWAP (total_len); 20535 obstack_grow (&contents, &val, sizeof (val)); 20536 total_len += obstack_object_size (&addr_obstack); 20537 20538 /* The offset of the symbol table from the start of the file. */ 20539 val = MAYBE_SWAP (total_len); 20540 obstack_grow (&contents, &val, sizeof (val)); 20541 total_len += obstack_object_size (&symtab_obstack); 20542 20543 /* The offset of the constant pool from the start of the file. */ 20544 val = MAYBE_SWAP (total_len); 20545 obstack_grow (&contents, &val, sizeof (val)); 20546 total_len += obstack_object_size (&constant_pool); 20547 20548 gdb_assert (obstack_object_size (&contents) == size_of_contents); 20549 20550 write_obstack (out_file, &contents); 20551 write_obstack (out_file, &cu_list); 20552 write_obstack (out_file, &types_cu_list); 20553 write_obstack (out_file, &addr_obstack); 20554 write_obstack (out_file, &symtab_obstack); 20555 write_obstack (out_file, &constant_pool); 20556 20557 fclose (out_file); 20558 20559 /* We want to keep the file, so we set cleanup_filename to NULL 20560 here. See unlink_if_set. */ 20561 cleanup_filename = NULL; 20562 20563 do_cleanups (cleanup); 20564 } 20565 20566 /* Implementation of the `save gdb-index' command. 20567 20568 Note that the file format used by this command is documented in the 20569 GDB manual. Any changes here must be documented there. */ 20570 20571 static void 20572 save_gdb_index_command (char *arg, int from_tty) 20573 { 20574 struct objfile *objfile; 20575 20576 if (!arg || !*arg) 20577 error (_("usage: save gdb-index DIRECTORY")); 20578 20579 ALL_OBJFILES (objfile) 20580 { 20581 struct stat st; 20582 20583 /* If the objfile does not correspond to an actual file, skip it. */ 20584 if (stat (objfile->name, &st) < 0) 20585 continue; 20586 20587 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key); 20588 if (dwarf2_per_objfile) 20589 { 20590 volatile struct gdb_exception except; 20591 20592 TRY_CATCH (except, RETURN_MASK_ERROR) 20593 { 20594 write_psymtabs_to_index (objfile, arg); 20595 } 20596 if (except.reason < 0) 20597 exception_fprintf (gdb_stderr, except, 20598 _("Error while writing index for `%s': "), 20599 objfile->name); 20600 } 20601 } 20602 } 20603 20604 20605 20606 int dwarf2_always_disassemble; 20607 20608 static void 20609 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty, 20610 struct cmd_list_element *c, const char *value) 20611 { 20612 fprintf_filtered (file, 20613 _("Whether to always disassemble " 20614 "DWARF expressions is %s.\n"), 20615 value); 20616 } 20617 20618 static void 20619 show_check_physname (struct ui_file *file, int from_tty, 20620 struct cmd_list_element *c, const char *value) 20621 { 20622 fprintf_filtered (file, 20623 _("Whether to check \"physname\" is %s.\n"), 20624 value); 20625 } 20626 20627 void _initialize_dwarf2_read (void); 20628 20629 void 20630 _initialize_dwarf2_read (void) 20631 { 20632 struct cmd_list_element *c; 20633 20634 dwarf2_objfile_data_key 20635 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free); 20636 20637 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\ 20638 Set DWARF 2 specific variables.\n\ 20639 Configure DWARF 2 variables such as the cache size"), 20640 &set_dwarf2_cmdlist, "maintenance set dwarf2 ", 20641 0/*allow-unknown*/, &maintenance_set_cmdlist); 20642 20643 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\ 20644 Show DWARF 2 specific variables\n\ 20645 Show DWARF 2 variables such as the cache size"), 20646 &show_dwarf2_cmdlist, "maintenance show dwarf2 ", 20647 0/*allow-unknown*/, &maintenance_show_cmdlist); 20648 20649 add_setshow_zinteger_cmd ("max-cache-age", class_obscure, 20650 &dwarf2_max_cache_age, _("\ 20651 Set the upper bound on the age of cached dwarf2 compilation units."), _("\ 20652 Show the upper bound on the age of cached dwarf2 compilation units."), _("\ 20653 A higher limit means that cached compilation units will be stored\n\ 20654 in memory longer, and more total memory will be used. Zero disables\n\ 20655 caching, which can slow down startup."), 20656 NULL, 20657 show_dwarf2_max_cache_age, 20658 &set_dwarf2_cmdlist, 20659 &show_dwarf2_cmdlist); 20660 20661 add_setshow_boolean_cmd ("always-disassemble", class_obscure, 20662 &dwarf2_always_disassemble, _("\ 20663 Set whether `info address' always disassembles DWARF expressions."), _("\ 20664 Show whether `info address' always disassembles DWARF expressions."), _("\ 20665 When enabled, DWARF expressions are always printed in an assembly-like\n\ 20666 syntax. When disabled, expressions will be printed in a more\n\ 20667 conversational style, when possible."), 20668 NULL, 20669 show_dwarf2_always_disassemble, 20670 &set_dwarf2_cmdlist, 20671 &show_dwarf2_cmdlist); 20672 20673 add_setshow_boolean_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\ 20674 Set debugging of the dwarf2 reader."), _("\ 20675 Show debugging of the dwarf2 reader."), _("\ 20676 When enabled, debugging messages are printed during dwarf2 reading\n\ 20677 and symtab expansion."), 20678 NULL, 20679 NULL, 20680 &setdebuglist, &showdebuglist); 20681 20682 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\ 20683 Set debugging of the dwarf2 DIE reader."), _("\ 20684 Show debugging of the dwarf2 DIE reader."), _("\ 20685 When enabled (non-zero), DIEs are dumped after they are read in.\n\ 20686 The value is the maximum depth to print."), 20687 NULL, 20688 NULL, 20689 &setdebuglist, &showdebuglist); 20690 20691 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\ 20692 Set cross-checking of \"physname\" code against demangler."), _("\ 20693 Show cross-checking of \"physname\" code against demangler."), _("\ 20694 When enabled, GDB's internal \"physname\" code is checked against\n\ 20695 the demangler."), 20696 NULL, show_check_physname, 20697 &setdebuglist, &showdebuglist); 20698 20699 add_setshow_boolean_cmd ("use-deprecated-index-sections", 20700 no_class, &use_deprecated_index_sections, _("\ 20701 Set whether to use deprecated gdb_index sections."), _("\ 20702 Show whether to use deprecated gdb_index sections."), _("\ 20703 When enabled, deprecated .gdb_index sections are used anyway.\n\ 20704 Normally they are ignored either because of a missing feature or\n\ 20705 performance issue.\n\ 20706 Warning: This option must be enabled before gdb reads the file."), 20707 NULL, 20708 NULL, 20709 &setlist, &showlist); 20710 20711 c = add_cmd ("gdb-index", class_files, save_gdb_index_command, 20712 _("\ 20713 Save a gdb-index file.\n\ 20714 Usage: save gdb-index DIRECTORY"), 20715 &save_cmdlist); 20716 set_cmd_completer (c, filename_completer); 20717 } 20718