1 /* DWARF 2 debugging format support for GDB. 2 3 Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 4 2004, 2005, 2006, 2007, 2008, 2009, 2010 5 Free Software Foundation, Inc. 6 7 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology, 8 Inc. with support from Florida State University (under contract 9 with the Ada Joint Program Office), and Silicon Graphics, Inc. 10 Initial contribution by Brent Benson, Harris Computer Systems, Inc., 11 based on Fred Fish's (Cygnus Support) implementation of DWARF 1 12 support. 13 14 This file is part of GDB. 15 16 This program is free software; you can redistribute it and/or modify 17 it under the terms of the GNU General Public License as published by 18 the Free Software Foundation; either version 3 of the License, or 19 (at your option) any later version. 20 21 This program is distributed in the hope that it will be useful, 22 but WITHOUT ANY WARRANTY; without even the implied warranty of 23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 24 GNU General Public License for more details. 25 26 You should have received a copy of the GNU General Public License 27 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 28 29 #include "defs.h" 30 #include "bfd.h" 31 #include "symtab.h" 32 #include "gdbtypes.h" 33 #include "objfiles.h" 34 #include "dwarf2.h" 35 #include "buildsym.h" 36 #include "demangle.h" 37 #include "expression.h" 38 #include "filenames.h" /* for DOSish file names */ 39 #include "macrotab.h" 40 #include "language.h" 41 #include "complaints.h" 42 #include "bcache.h" 43 #include "dwarf2expr.h" 44 #include "dwarf2loc.h" 45 #include "cp-support.h" 46 #include "hashtab.h" 47 #include "command.h" 48 #include "gdbcmd.h" 49 #include "block.h" 50 #include "addrmap.h" 51 #include "typeprint.h" 52 #include "jv-lang.h" 53 #include "psympriv.h" 54 55 #include <fcntl.h> 56 #include "gdb_string.h" 57 #include "gdb_assert.h" 58 #include <sys/types.h> 59 #ifdef HAVE_ZLIB_H 60 #include <zlib.h> 61 #endif 62 #ifdef HAVE_MMAP 63 #include <sys/mman.h> 64 #ifndef MAP_FAILED 65 #define MAP_FAILED ((void *) -1) 66 #endif 67 #endif 68 69 #if 0 70 /* .debug_info header for a compilation unit 71 Because of alignment constraints, this structure has padding and cannot 72 be mapped directly onto the beginning of the .debug_info section. */ 73 typedef struct comp_unit_header 74 { 75 unsigned int length; /* length of the .debug_info 76 contribution */ 77 unsigned short version; /* version number -- 2 for DWARF 78 version 2 */ 79 unsigned int abbrev_offset; /* offset into .debug_abbrev section */ 80 unsigned char addr_size; /* byte size of an address -- 4 */ 81 } 82 _COMP_UNIT_HEADER; 83 #define _ACTUAL_COMP_UNIT_HEADER_SIZE 11 84 #endif 85 86 /* .debug_line statement program prologue 87 Because of alignment constraints, this structure has padding and cannot 88 be mapped directly onto the beginning of the .debug_info section. */ 89 typedef struct statement_prologue 90 { 91 unsigned int total_length; /* byte length of the statement 92 information */ 93 unsigned short version; /* version number -- 2 for DWARF 94 version 2 */ 95 unsigned int prologue_length; /* # bytes between prologue & 96 stmt program */ 97 unsigned char minimum_instruction_length; /* byte size of 98 smallest instr */ 99 unsigned char default_is_stmt; /* initial value of is_stmt 100 register */ 101 char line_base; 102 unsigned char line_range; 103 unsigned char opcode_base; /* number assigned to first special 104 opcode */ 105 unsigned char *standard_opcode_lengths; 106 } 107 _STATEMENT_PROLOGUE; 108 109 /* When non-zero, dump DIEs after they are read in. */ 110 static int dwarf2_die_debug = 0; 111 112 static int pagesize; 113 114 /* When set, the file that we're processing is known to have debugging 115 info for C++ namespaces. GCC 3.3.x did not produce this information, 116 but later versions do. */ 117 118 static int processing_has_namespace_info; 119 120 static const struct objfile_data *dwarf2_objfile_data_key; 121 122 struct dwarf2_section_info 123 { 124 asection *asection; 125 gdb_byte *buffer; 126 bfd_size_type size; 127 int was_mmapped; 128 /* True if we have tried to read this section. */ 129 int readin; 130 }; 131 132 struct dwarf2_per_objfile 133 { 134 struct dwarf2_section_info info; 135 struct dwarf2_section_info abbrev; 136 struct dwarf2_section_info line; 137 struct dwarf2_section_info loc; 138 struct dwarf2_section_info macinfo; 139 struct dwarf2_section_info str; 140 struct dwarf2_section_info ranges; 141 struct dwarf2_section_info types; 142 struct dwarf2_section_info frame; 143 struct dwarf2_section_info eh_frame; 144 145 /* Back link. */ 146 struct objfile *objfile; 147 148 /* A list of all the compilation units. This is used to locate 149 the target compilation unit of a particular reference. */ 150 struct dwarf2_per_cu_data **all_comp_units; 151 152 /* The number of compilation units in ALL_COMP_UNITS. */ 153 int n_comp_units; 154 155 /* A chain of compilation units that are currently read in, so that 156 they can be freed later. */ 157 struct dwarf2_per_cu_data *read_in_chain; 158 159 /* A table mapping .debug_types signatures to its signatured_type entry. 160 This is NULL if the .debug_types section hasn't been read in yet. */ 161 htab_t signatured_types; 162 163 /* A flag indicating wether this objfile has a section loaded at a 164 VMA of 0. */ 165 int has_section_at_zero; 166 }; 167 168 static struct dwarf2_per_objfile *dwarf2_per_objfile; 169 170 /* names of the debugging sections */ 171 172 /* Note that if the debugging section has been compressed, it might 173 have a name like .zdebug_info. */ 174 175 #define INFO_SECTION "debug_info" 176 #define ABBREV_SECTION "debug_abbrev" 177 #define LINE_SECTION "debug_line" 178 #define LOC_SECTION "debug_loc" 179 #define MACINFO_SECTION "debug_macinfo" 180 #define STR_SECTION "debug_str" 181 #define RANGES_SECTION "debug_ranges" 182 #define TYPES_SECTION "debug_types" 183 #define FRAME_SECTION "debug_frame" 184 #define EH_FRAME_SECTION "eh_frame" 185 186 /* local data types */ 187 188 /* We hold several abbreviation tables in memory at the same time. */ 189 #ifndef ABBREV_HASH_SIZE 190 #define ABBREV_HASH_SIZE 121 191 #endif 192 193 /* The data in a compilation unit header, after target2host 194 translation, looks like this. */ 195 struct comp_unit_head 196 { 197 unsigned int length; 198 short version; 199 unsigned char addr_size; 200 unsigned char signed_addr_p; 201 unsigned int abbrev_offset; 202 203 /* Size of file offsets; either 4 or 8. */ 204 unsigned int offset_size; 205 206 /* Size of the length field; either 4 or 12. */ 207 unsigned int initial_length_size; 208 209 /* Offset to the first byte of this compilation unit header in the 210 .debug_info section, for resolving relative reference dies. */ 211 unsigned int offset; 212 213 /* Offset to first die in this cu from the start of the cu. 214 This will be the first byte following the compilation unit header. */ 215 unsigned int first_die_offset; 216 }; 217 218 /* Internal state when decoding a particular compilation unit. */ 219 struct dwarf2_cu 220 { 221 /* The objfile containing this compilation unit. */ 222 struct objfile *objfile; 223 224 /* The header of the compilation unit. */ 225 struct comp_unit_head header; 226 227 /* Base address of this compilation unit. */ 228 CORE_ADDR base_address; 229 230 /* Non-zero if base_address has been set. */ 231 int base_known; 232 233 struct function_range *first_fn, *last_fn, *cached_fn; 234 235 /* The language we are debugging. */ 236 enum language language; 237 const struct language_defn *language_defn; 238 239 const char *producer; 240 241 /* The generic symbol table building routines have separate lists for 242 file scope symbols and all all other scopes (local scopes). So 243 we need to select the right one to pass to add_symbol_to_list(). 244 We do it by keeping a pointer to the correct list in list_in_scope. 245 246 FIXME: The original dwarf code just treated the file scope as the 247 first local scope, and all other local scopes as nested local 248 scopes, and worked fine. Check to see if we really need to 249 distinguish these in buildsym.c. */ 250 struct pending **list_in_scope; 251 252 /* DWARF abbreviation table associated with this compilation unit. */ 253 struct abbrev_info **dwarf2_abbrevs; 254 255 /* Storage for the abbrev table. */ 256 struct obstack abbrev_obstack; 257 258 /* Hash table holding all the loaded partial DIEs. */ 259 htab_t partial_dies; 260 261 /* Storage for things with the same lifetime as this read-in compilation 262 unit, including partial DIEs. */ 263 struct obstack comp_unit_obstack; 264 265 /* When multiple dwarf2_cu structures are living in memory, this field 266 chains them all together, so that they can be released efficiently. 267 We will probably also want a generation counter so that most-recently-used 268 compilation units are cached... */ 269 struct dwarf2_per_cu_data *read_in_chain; 270 271 /* Backchain to our per_cu entry if the tree has been built. */ 272 struct dwarf2_per_cu_data *per_cu; 273 274 /* Pointer to the die -> type map. Although it is stored 275 permanently in per_cu, we copy it here to avoid double 276 indirection. */ 277 htab_t type_hash; 278 279 /* How many compilation units ago was this CU last referenced? */ 280 int last_used; 281 282 /* A hash table of die offsets for following references. */ 283 htab_t die_hash; 284 285 /* Full DIEs if read in. */ 286 struct die_info *dies; 287 288 /* A set of pointers to dwarf2_per_cu_data objects for compilation 289 units referenced by this one. Only set during full symbol processing; 290 partial symbol tables do not have dependencies. */ 291 htab_t dependencies; 292 293 /* Header data from the line table, during full symbol processing. */ 294 struct line_header *line_header; 295 296 /* Mark used when releasing cached dies. */ 297 unsigned int mark : 1; 298 299 /* This flag will be set if this compilation unit might include 300 inter-compilation-unit references. */ 301 unsigned int has_form_ref_addr : 1; 302 303 /* This flag will be set if this compilation unit includes any 304 DW_TAG_namespace DIEs. If we know that there are explicit 305 DIEs for namespaces, we don't need to try to infer them 306 from mangled names. */ 307 unsigned int has_namespace_info : 1; 308 }; 309 310 /* Persistent data held for a compilation unit, even when not 311 processing it. We put a pointer to this structure in the 312 read_symtab_private field of the psymtab. If we encounter 313 inter-compilation-unit references, we also maintain a sorted 314 list of all compilation units. */ 315 316 struct dwarf2_per_cu_data 317 { 318 /* The start offset and length of this compilation unit. 2**29-1 319 bytes should suffice to store the length of any compilation unit 320 - if it doesn't, GDB will fall over anyway. 321 NOTE: Unlike comp_unit_head.length, this length includes 322 initial_length_size. */ 323 unsigned int offset; 324 unsigned int length : 29; 325 326 /* Flag indicating this compilation unit will be read in before 327 any of the current compilation units are processed. */ 328 unsigned int queued : 1; 329 330 /* This flag will be set if we need to load absolutely all DIEs 331 for this compilation unit, instead of just the ones we think 332 are interesting. It gets set if we look for a DIE in the 333 hash table and don't find it. */ 334 unsigned int load_all_dies : 1; 335 336 /* Non-zero if this CU is from .debug_types. 337 Otherwise it's from .debug_info. */ 338 unsigned int from_debug_types : 1; 339 340 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out 341 of the CU cache it gets reset to NULL again. */ 342 struct dwarf2_cu *cu; 343 344 /* If full symbols for this CU have been read in, then this field 345 holds a map of DIE offsets to types. It isn't always possible 346 to reconstruct this information later, so we have to preserve 347 it. */ 348 htab_t type_hash; 349 350 /* The partial symbol table associated with this compilation unit, 351 or NULL for partial units (which do not have an associated 352 symtab). */ 353 struct partial_symtab *psymtab; 354 }; 355 356 /* Entry in the signatured_types hash table. */ 357 358 struct signatured_type 359 { 360 ULONGEST signature; 361 362 /* Offset in .debug_types of the TU (type_unit) for this type. */ 363 unsigned int offset; 364 365 /* Offset in .debug_types of the type defined by this TU. */ 366 unsigned int type_offset; 367 368 /* The CU(/TU) of this type. */ 369 struct dwarf2_per_cu_data per_cu; 370 }; 371 372 /* Struct used to pass misc. parameters to read_die_and_children, et. al. 373 which are used for both .debug_info and .debug_types dies. 374 All parameters here are unchanging for the life of the call. 375 This struct exists to abstract away the constant parameters of 376 die reading. */ 377 378 struct die_reader_specs 379 { 380 /* The bfd of this objfile. */ 381 bfd* abfd; 382 383 /* The CU of the DIE we are parsing. */ 384 struct dwarf2_cu *cu; 385 386 /* Pointer to start of section buffer. 387 This is either the start of .debug_info or .debug_types. */ 388 const gdb_byte *buffer; 389 }; 390 391 /* The line number information for a compilation unit (found in the 392 .debug_line section) begins with a "statement program header", 393 which contains the following information. */ 394 struct line_header 395 { 396 unsigned int total_length; 397 unsigned short version; 398 unsigned int header_length; 399 unsigned char minimum_instruction_length; 400 unsigned char maximum_ops_per_instruction; 401 unsigned char default_is_stmt; 402 int line_base; 403 unsigned char line_range; 404 unsigned char opcode_base; 405 406 /* standard_opcode_lengths[i] is the number of operands for the 407 standard opcode whose value is i. This means that 408 standard_opcode_lengths[0] is unused, and the last meaningful 409 element is standard_opcode_lengths[opcode_base - 1]. */ 410 unsigned char *standard_opcode_lengths; 411 412 /* The include_directories table. NOTE! These strings are not 413 allocated with xmalloc; instead, they are pointers into 414 debug_line_buffer. If you try to free them, `free' will get 415 indigestion. */ 416 unsigned int num_include_dirs, include_dirs_size; 417 char **include_dirs; 418 419 /* The file_names table. NOTE! These strings are not allocated 420 with xmalloc; instead, they are pointers into debug_line_buffer. 421 Don't try to free them directly. */ 422 unsigned int num_file_names, file_names_size; 423 struct file_entry 424 { 425 char *name; 426 unsigned int dir_index; 427 unsigned int mod_time; 428 unsigned int length; 429 int included_p; /* Non-zero if referenced by the Line Number Program. */ 430 struct symtab *symtab; /* The associated symbol table, if any. */ 431 } *file_names; 432 433 /* The start and end of the statement program following this 434 header. These point into dwarf2_per_objfile->line_buffer. */ 435 gdb_byte *statement_program_start, *statement_program_end; 436 }; 437 438 /* When we construct a partial symbol table entry we only 439 need this much information. */ 440 struct partial_die_info 441 { 442 /* Offset of this DIE. */ 443 unsigned int offset; 444 445 /* DWARF-2 tag for this DIE. */ 446 ENUM_BITFIELD(dwarf_tag) tag : 16; 447 448 /* Assorted flags describing the data found in this DIE. */ 449 unsigned int has_children : 1; 450 unsigned int is_external : 1; 451 unsigned int is_declaration : 1; 452 unsigned int has_type : 1; 453 unsigned int has_specification : 1; 454 unsigned int has_pc_info : 1; 455 456 /* Flag set if the SCOPE field of this structure has been 457 computed. */ 458 unsigned int scope_set : 1; 459 460 /* Flag set if the DIE has a byte_size attribute. */ 461 unsigned int has_byte_size : 1; 462 463 /* The name of this DIE. Normally the value of DW_AT_name, but 464 sometimes a default name for unnamed DIEs. */ 465 char *name; 466 467 /* The scope to prepend to our children. This is generally 468 allocated on the comp_unit_obstack, so will disappear 469 when this compilation unit leaves the cache. */ 470 char *scope; 471 472 /* The location description associated with this DIE, if any. */ 473 struct dwarf_block *locdesc; 474 475 /* If HAS_PC_INFO, the PC range associated with this DIE. */ 476 CORE_ADDR lowpc; 477 CORE_ADDR highpc; 478 479 /* Pointer into the info_buffer (or types_buffer) pointing at the target of 480 DW_AT_sibling, if any. */ 481 gdb_byte *sibling; 482 483 /* If HAS_SPECIFICATION, the offset of the DIE referred to by 484 DW_AT_specification (or DW_AT_abstract_origin or 485 DW_AT_extension). */ 486 unsigned int spec_offset; 487 488 /* Pointers to this DIE's parent, first child, and next sibling, 489 if any. */ 490 struct partial_die_info *die_parent, *die_child, *die_sibling; 491 }; 492 493 /* This data structure holds the information of an abbrev. */ 494 struct abbrev_info 495 { 496 unsigned int number; /* number identifying abbrev */ 497 enum dwarf_tag tag; /* dwarf tag */ 498 unsigned short has_children; /* boolean */ 499 unsigned short num_attrs; /* number of attributes */ 500 struct attr_abbrev *attrs; /* an array of attribute descriptions */ 501 struct abbrev_info *next; /* next in chain */ 502 }; 503 504 struct attr_abbrev 505 { 506 ENUM_BITFIELD(dwarf_attribute) name : 16; 507 ENUM_BITFIELD(dwarf_form) form : 16; 508 }; 509 510 /* Attributes have a name and a value */ 511 struct attribute 512 { 513 ENUM_BITFIELD(dwarf_attribute) name : 16; 514 ENUM_BITFIELD(dwarf_form) form : 15; 515 516 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This 517 field should be in u.str (existing only for DW_STRING) but it is kept 518 here for better struct attribute alignment. */ 519 unsigned int string_is_canonical : 1; 520 521 union 522 { 523 char *str; 524 struct dwarf_block *blk; 525 ULONGEST unsnd; 526 LONGEST snd; 527 CORE_ADDR addr; 528 struct signatured_type *signatured_type; 529 } 530 u; 531 }; 532 533 /* This data structure holds a complete die structure. */ 534 struct die_info 535 { 536 /* DWARF-2 tag for this DIE. */ 537 ENUM_BITFIELD(dwarf_tag) tag : 16; 538 539 /* Number of attributes */ 540 unsigned short num_attrs; 541 542 /* Abbrev number */ 543 unsigned int abbrev; 544 545 /* Offset in .debug_info or .debug_types section. */ 546 unsigned int offset; 547 548 /* The dies in a compilation unit form an n-ary tree. PARENT 549 points to this die's parent; CHILD points to the first child of 550 this node; and all the children of a given node are chained 551 together via their SIBLING fields, terminated by a die whose 552 tag is zero. */ 553 struct die_info *child; /* Its first child, if any. */ 554 struct die_info *sibling; /* Its next sibling, if any. */ 555 struct die_info *parent; /* Its parent, if any. */ 556 557 /* An array of attributes, with NUM_ATTRS elements. There may be 558 zero, but it's not common and zero-sized arrays are not 559 sufficiently portable C. */ 560 struct attribute attrs[1]; 561 }; 562 563 struct function_range 564 { 565 const char *name; 566 CORE_ADDR lowpc, highpc; 567 int seen_line; 568 struct function_range *next; 569 }; 570 571 /* Get at parts of an attribute structure */ 572 573 #define DW_STRING(attr) ((attr)->u.str) 574 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical) 575 #define DW_UNSND(attr) ((attr)->u.unsnd) 576 #define DW_BLOCK(attr) ((attr)->u.blk) 577 #define DW_SND(attr) ((attr)->u.snd) 578 #define DW_ADDR(attr) ((attr)->u.addr) 579 #define DW_SIGNATURED_TYPE(attr) ((attr)->u.signatured_type) 580 581 /* Blocks are a bunch of untyped bytes. */ 582 struct dwarf_block 583 { 584 unsigned int size; 585 gdb_byte *data; 586 }; 587 588 #ifndef ATTR_ALLOC_CHUNK 589 #define ATTR_ALLOC_CHUNK 4 590 #endif 591 592 /* Allocate fields for structs, unions and enums in this size. */ 593 #ifndef DW_FIELD_ALLOC_CHUNK 594 #define DW_FIELD_ALLOC_CHUNK 4 595 #endif 596 597 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte, 598 but this would require a corresponding change in unpack_field_as_long 599 and friends. */ 600 static int bits_per_byte = 8; 601 602 /* The routines that read and process dies for a C struct or C++ class 603 pass lists of data member fields and lists of member function fields 604 in an instance of a field_info structure, as defined below. */ 605 struct field_info 606 { 607 /* List of data member and baseclasses fields. */ 608 struct nextfield 609 { 610 struct nextfield *next; 611 int accessibility; 612 int virtuality; 613 struct field field; 614 } 615 *fields, *baseclasses; 616 617 /* Number of fields (including baseclasses). */ 618 int nfields; 619 620 /* Number of baseclasses. */ 621 int nbaseclasses; 622 623 /* Set if the accesibility of one of the fields is not public. */ 624 int non_public_fields; 625 626 /* Member function fields array, entries are allocated in the order they 627 are encountered in the object file. */ 628 struct nextfnfield 629 { 630 struct nextfnfield *next; 631 struct fn_field fnfield; 632 } 633 *fnfields; 634 635 /* Member function fieldlist array, contains name of possibly overloaded 636 member function, number of overloaded member functions and a pointer 637 to the head of the member function field chain. */ 638 struct fnfieldlist 639 { 640 char *name; 641 int length; 642 struct nextfnfield *head; 643 } 644 *fnfieldlists; 645 646 /* Number of entries in the fnfieldlists array. */ 647 int nfnfields; 648 649 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of 650 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */ 651 struct typedef_field_list 652 { 653 struct typedef_field field; 654 struct typedef_field_list *next; 655 } 656 *typedef_field_list; 657 unsigned typedef_field_list_count; 658 }; 659 660 /* One item on the queue of compilation units to read in full symbols 661 for. */ 662 struct dwarf2_queue_item 663 { 664 struct dwarf2_per_cu_data *per_cu; 665 struct dwarf2_queue_item *next; 666 }; 667 668 /* The current queue. */ 669 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail; 670 671 /* Loaded secondary compilation units are kept in memory until they 672 have not been referenced for the processing of this many 673 compilation units. Set this to zero to disable caching. Cache 674 sizes of up to at least twenty will improve startup time for 675 typical inter-CU-reference binaries, at an obvious memory cost. */ 676 static int dwarf2_max_cache_age = 5; 677 static void 678 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty, 679 struct cmd_list_element *c, const char *value) 680 { 681 fprintf_filtered (file, _("\ 682 The upper bound on the age of cached dwarf2 compilation units is %s.\n"), 683 value); 684 } 685 686 687 /* Various complaints about symbol reading that don't abort the process */ 688 689 static void 690 dwarf2_statement_list_fits_in_line_number_section_complaint (void) 691 { 692 complaint (&symfile_complaints, 693 _("statement list doesn't fit in .debug_line section")); 694 } 695 696 static void 697 dwarf2_debug_line_missing_file_complaint (void) 698 { 699 complaint (&symfile_complaints, 700 _(".debug_line section has line data without a file")); 701 } 702 703 static void 704 dwarf2_debug_line_missing_end_sequence_complaint (void) 705 { 706 complaint (&symfile_complaints, 707 _(".debug_line section has line program sequence without an end")); 708 } 709 710 static void 711 dwarf2_complex_location_expr_complaint (void) 712 { 713 complaint (&symfile_complaints, _("location expression too complex")); 714 } 715 716 static void 717 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2, 718 int arg3) 719 { 720 complaint (&symfile_complaints, 721 _("const value length mismatch for '%s', got %d, expected %d"), arg1, 722 arg2, arg3); 723 } 724 725 static void 726 dwarf2_macros_too_long_complaint (void) 727 { 728 complaint (&symfile_complaints, 729 _("macro info runs off end of `.debug_macinfo' section")); 730 } 731 732 static void 733 dwarf2_macro_malformed_definition_complaint (const char *arg1) 734 { 735 complaint (&symfile_complaints, 736 _("macro debug info contains a malformed macro definition:\n`%s'"), 737 arg1); 738 } 739 740 static void 741 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2) 742 { 743 complaint (&symfile_complaints, 744 _("invalid attribute class or form for '%s' in '%s'"), arg1, arg2); 745 } 746 747 /* local function prototypes */ 748 749 static void dwarf2_locate_sections (bfd *, asection *, void *); 750 751 static void dwarf2_create_include_psymtab (char *, struct partial_symtab *, 752 struct objfile *); 753 754 static void dwarf2_build_include_psymtabs (struct dwarf2_cu *, 755 struct die_info *, 756 struct partial_symtab *); 757 758 static void dwarf2_build_psymtabs_hard (struct objfile *); 759 760 static void scan_partial_symbols (struct partial_die_info *, 761 CORE_ADDR *, CORE_ADDR *, 762 int, struct dwarf2_cu *); 763 764 static void add_partial_symbol (struct partial_die_info *, 765 struct dwarf2_cu *); 766 767 static void add_partial_namespace (struct partial_die_info *pdi, 768 CORE_ADDR *lowpc, CORE_ADDR *highpc, 769 int need_pc, struct dwarf2_cu *cu); 770 771 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, 772 CORE_ADDR *highpc, int need_pc, 773 struct dwarf2_cu *cu); 774 775 static void add_partial_enumeration (struct partial_die_info *enum_pdi, 776 struct dwarf2_cu *cu); 777 778 static void add_partial_subprogram (struct partial_die_info *pdi, 779 CORE_ADDR *lowpc, CORE_ADDR *highpc, 780 int need_pc, struct dwarf2_cu *cu); 781 782 static gdb_byte *locate_pdi_sibling (struct partial_die_info *orig_pdi, 783 gdb_byte *buffer, gdb_byte *info_ptr, 784 bfd *abfd, struct dwarf2_cu *cu); 785 786 static void dwarf2_psymtab_to_symtab (struct partial_symtab *); 787 788 static void psymtab_to_symtab_1 (struct partial_symtab *); 789 790 static void dwarf2_read_abbrevs (bfd *abfd, struct dwarf2_cu *cu); 791 792 static void dwarf2_free_abbrev_table (void *); 793 794 static struct abbrev_info *peek_die_abbrev (gdb_byte *, unsigned int *, 795 struct dwarf2_cu *); 796 797 static struct abbrev_info *dwarf2_lookup_abbrev (unsigned int, 798 struct dwarf2_cu *); 799 800 static struct partial_die_info *load_partial_dies (bfd *, 801 gdb_byte *, gdb_byte *, 802 int, struct dwarf2_cu *); 803 804 static gdb_byte *read_partial_die (struct partial_die_info *, 805 struct abbrev_info *abbrev, 806 unsigned int, bfd *, 807 gdb_byte *, gdb_byte *, 808 struct dwarf2_cu *); 809 810 static struct partial_die_info *find_partial_die (unsigned int, 811 struct dwarf2_cu *); 812 813 static void fixup_partial_die (struct partial_die_info *, 814 struct dwarf2_cu *); 815 816 static gdb_byte *read_attribute (struct attribute *, struct attr_abbrev *, 817 bfd *, gdb_byte *, struct dwarf2_cu *); 818 819 static gdb_byte *read_attribute_value (struct attribute *, unsigned, 820 bfd *, gdb_byte *, struct dwarf2_cu *); 821 822 static unsigned int read_1_byte (bfd *, gdb_byte *); 823 824 static int read_1_signed_byte (bfd *, gdb_byte *); 825 826 static unsigned int read_2_bytes (bfd *, gdb_byte *); 827 828 static unsigned int read_4_bytes (bfd *, gdb_byte *); 829 830 static ULONGEST read_8_bytes (bfd *, gdb_byte *); 831 832 static CORE_ADDR read_address (bfd *, gdb_byte *ptr, struct dwarf2_cu *, 833 unsigned int *); 834 835 static LONGEST read_initial_length (bfd *, gdb_byte *, unsigned int *); 836 837 static LONGEST read_checked_initial_length_and_offset 838 (bfd *, gdb_byte *, const struct comp_unit_head *, 839 unsigned int *, unsigned int *); 840 841 static LONGEST read_offset (bfd *, gdb_byte *, const struct comp_unit_head *, 842 unsigned int *); 843 844 static LONGEST read_offset_1 (bfd *, gdb_byte *, unsigned int); 845 846 static gdb_byte *read_n_bytes (bfd *, gdb_byte *, unsigned int); 847 848 static char *read_string (bfd *, gdb_byte *, unsigned int *); 849 850 static char *read_indirect_string (bfd *, gdb_byte *, 851 const struct comp_unit_head *, 852 unsigned int *); 853 854 static unsigned long read_unsigned_leb128 (bfd *, gdb_byte *, unsigned int *); 855 856 static long read_signed_leb128 (bfd *, gdb_byte *, unsigned int *); 857 858 static gdb_byte *skip_leb128 (bfd *, gdb_byte *); 859 860 static void set_cu_language (unsigned int, struct dwarf2_cu *); 861 862 static struct attribute *dwarf2_attr (struct die_info *, unsigned int, 863 struct dwarf2_cu *); 864 865 static struct attribute *dwarf2_attr_no_follow (struct die_info *, 866 unsigned int, 867 struct dwarf2_cu *); 868 869 static int dwarf2_flag_true_p (struct die_info *die, unsigned name, 870 struct dwarf2_cu *cu); 871 872 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu); 873 874 static struct die_info *die_specification (struct die_info *die, 875 struct dwarf2_cu **); 876 877 static void free_line_header (struct line_header *lh); 878 879 static void add_file_name (struct line_header *, char *, unsigned int, 880 unsigned int, unsigned int); 881 882 static struct line_header *(dwarf_decode_line_header 883 (unsigned int offset, 884 bfd *abfd, struct dwarf2_cu *cu)); 885 886 static void dwarf_decode_lines (struct line_header *, char *, bfd *, 887 struct dwarf2_cu *, struct partial_symtab *); 888 889 static void dwarf2_start_subfile (char *, char *, char *); 890 891 static struct symbol *new_symbol (struct die_info *, struct type *, 892 struct dwarf2_cu *); 893 894 static void dwarf2_const_value (struct attribute *, struct symbol *, 895 struct dwarf2_cu *); 896 897 static void dwarf2_const_value_data (struct attribute *attr, 898 struct symbol *sym, 899 int bits); 900 901 static struct type *die_type (struct die_info *, struct dwarf2_cu *); 902 903 static int need_gnat_info (struct dwarf2_cu *); 904 905 static struct type *die_descriptive_type (struct die_info *, struct dwarf2_cu *); 906 907 static void set_descriptive_type (struct type *, struct die_info *, 908 struct dwarf2_cu *); 909 910 static struct type *die_containing_type (struct die_info *, 911 struct dwarf2_cu *); 912 913 static struct type *tag_type_to_type (struct die_info *, struct dwarf2_cu *); 914 915 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *); 916 917 static char *determine_prefix (struct die_info *die, struct dwarf2_cu *); 918 919 static char *typename_concat (struct obstack *obs, const char *prefix, 920 const char *suffix, int physname, 921 struct dwarf2_cu *cu); 922 923 static void read_file_scope (struct die_info *, struct dwarf2_cu *); 924 925 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *); 926 927 static void read_func_scope (struct die_info *, struct dwarf2_cu *); 928 929 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *); 930 931 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *, 932 struct dwarf2_cu *, struct partial_symtab *); 933 934 static int dwarf2_get_pc_bounds (struct die_info *, 935 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *, 936 struct partial_symtab *); 937 938 static void get_scope_pc_bounds (struct die_info *, 939 CORE_ADDR *, CORE_ADDR *, 940 struct dwarf2_cu *); 941 942 static void dwarf2_record_block_ranges (struct die_info *, struct block *, 943 CORE_ADDR, struct dwarf2_cu *); 944 945 static void dwarf2_add_field (struct field_info *, struct die_info *, 946 struct dwarf2_cu *); 947 948 static void dwarf2_attach_fields_to_type (struct field_info *, 949 struct type *, struct dwarf2_cu *); 950 951 static void dwarf2_add_member_fn (struct field_info *, 952 struct die_info *, struct type *, 953 struct dwarf2_cu *); 954 955 static void dwarf2_attach_fn_fields_to_type (struct field_info *, 956 struct type *, struct dwarf2_cu *); 957 958 static void process_structure_scope (struct die_info *, struct dwarf2_cu *); 959 960 static void read_common_block (struct die_info *, struct dwarf2_cu *); 961 962 static void read_namespace (struct die_info *die, struct dwarf2_cu *); 963 964 static void read_module (struct die_info *die, struct dwarf2_cu *cu); 965 966 static void read_import_statement (struct die_info *die, struct dwarf2_cu *); 967 968 static struct type *read_module_type (struct die_info *die, 969 struct dwarf2_cu *cu); 970 971 static const char *namespace_name (struct die_info *die, 972 int *is_anonymous, struct dwarf2_cu *); 973 974 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *); 975 976 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *); 977 978 static enum dwarf_array_dim_ordering read_array_order (struct die_info *, 979 struct dwarf2_cu *); 980 981 static struct die_info *read_comp_unit (gdb_byte *, struct dwarf2_cu *); 982 983 static struct die_info *read_die_and_children_1 (const struct die_reader_specs *reader, 984 gdb_byte *info_ptr, 985 gdb_byte **new_info_ptr, 986 struct die_info *parent); 987 988 static struct die_info *read_die_and_children (const struct die_reader_specs *reader, 989 gdb_byte *info_ptr, 990 gdb_byte **new_info_ptr, 991 struct die_info *parent); 992 993 static struct die_info *read_die_and_siblings (const struct die_reader_specs *reader, 994 gdb_byte *info_ptr, 995 gdb_byte **new_info_ptr, 996 struct die_info *parent); 997 998 static gdb_byte *read_full_die (const struct die_reader_specs *reader, 999 struct die_info **, gdb_byte *, 1000 int *); 1001 1002 static void process_die (struct die_info *, struct dwarf2_cu *); 1003 1004 static char *dwarf2_canonicalize_name (char *, struct dwarf2_cu *, 1005 struct obstack *); 1006 1007 static char *dwarf2_name (struct die_info *die, struct dwarf2_cu *); 1008 1009 static struct die_info *dwarf2_extension (struct die_info *die, 1010 struct dwarf2_cu **); 1011 1012 static char *dwarf_tag_name (unsigned int); 1013 1014 static char *dwarf_attr_name (unsigned int); 1015 1016 static char *dwarf_form_name (unsigned int); 1017 1018 static char *dwarf_bool_name (unsigned int); 1019 1020 static char *dwarf_type_encoding_name (unsigned int); 1021 1022 #if 0 1023 static char *dwarf_cfi_name (unsigned int); 1024 #endif 1025 1026 static struct die_info *sibling_die (struct die_info *); 1027 1028 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *); 1029 1030 static void dump_die_for_error (struct die_info *); 1031 1032 static void dump_die_1 (struct ui_file *, int level, int max_level, 1033 struct die_info *); 1034 1035 /*static*/ void dump_die (struct die_info *, int max_level); 1036 1037 static void store_in_ref_table (struct die_info *, 1038 struct dwarf2_cu *); 1039 1040 static int is_ref_attr (struct attribute *); 1041 1042 static unsigned int dwarf2_get_ref_die_offset (struct attribute *); 1043 1044 static LONGEST dwarf2_get_attr_constant_value (struct attribute *, int); 1045 1046 static struct die_info *follow_die_ref_or_sig (struct die_info *, 1047 struct attribute *, 1048 struct dwarf2_cu **); 1049 1050 static struct die_info *follow_die_ref (struct die_info *, 1051 struct attribute *, 1052 struct dwarf2_cu **); 1053 1054 static struct die_info *follow_die_sig (struct die_info *, 1055 struct attribute *, 1056 struct dwarf2_cu **); 1057 1058 static void read_signatured_type_at_offset (struct objfile *objfile, 1059 unsigned int offset); 1060 1061 static void read_signatured_type (struct objfile *, 1062 struct signatured_type *type_sig); 1063 1064 /* memory allocation interface */ 1065 1066 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *); 1067 1068 static struct abbrev_info *dwarf_alloc_abbrev (struct dwarf2_cu *); 1069 1070 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int); 1071 1072 static void initialize_cu_func_list (struct dwarf2_cu *); 1073 1074 static void add_to_cu_func_list (const char *, CORE_ADDR, CORE_ADDR, 1075 struct dwarf2_cu *); 1076 1077 static void dwarf_decode_macros (struct line_header *, unsigned int, 1078 char *, bfd *, struct dwarf2_cu *); 1079 1080 static int attr_form_is_block (struct attribute *); 1081 1082 static int attr_form_is_section_offset (struct attribute *); 1083 1084 static int attr_form_is_constant (struct attribute *); 1085 1086 static void dwarf2_symbol_mark_computed (struct attribute *attr, 1087 struct symbol *sym, 1088 struct dwarf2_cu *cu); 1089 1090 static gdb_byte *skip_one_die (gdb_byte *buffer, gdb_byte *info_ptr, 1091 struct abbrev_info *abbrev, 1092 struct dwarf2_cu *cu); 1093 1094 static void free_stack_comp_unit (void *); 1095 1096 static hashval_t partial_die_hash (const void *item); 1097 1098 static int partial_die_eq (const void *item_lhs, const void *item_rhs); 1099 1100 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit 1101 (unsigned int offset, struct objfile *objfile); 1102 1103 static struct dwarf2_per_cu_data *dwarf2_find_comp_unit 1104 (unsigned int offset, struct objfile *objfile); 1105 1106 static struct dwarf2_cu *alloc_one_comp_unit (struct objfile *objfile); 1107 1108 static void free_one_comp_unit (void *); 1109 1110 static void free_cached_comp_units (void *); 1111 1112 static void age_cached_comp_units (void); 1113 1114 static void free_one_cached_comp_unit (void *); 1115 1116 static struct type *set_die_type (struct die_info *, struct type *, 1117 struct dwarf2_cu *); 1118 1119 static void create_all_comp_units (struct objfile *); 1120 1121 static void load_full_comp_unit (struct dwarf2_per_cu_data *, 1122 struct objfile *); 1123 1124 static void process_full_comp_unit (struct dwarf2_per_cu_data *); 1125 1126 static void dwarf2_add_dependence (struct dwarf2_cu *, 1127 struct dwarf2_per_cu_data *); 1128 1129 static void dwarf2_mark (struct dwarf2_cu *); 1130 1131 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *); 1132 1133 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu); 1134 1135 /* Try to locate the sections we need for DWARF 2 debugging 1136 information and return true if we have enough to do something. */ 1137 1138 int 1139 dwarf2_has_info (struct objfile *objfile) 1140 { 1141 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key); 1142 if (!dwarf2_per_objfile) 1143 { 1144 /* Initialize per-objfile state. */ 1145 struct dwarf2_per_objfile *data 1146 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data)); 1147 1148 memset (data, 0, sizeof (*data)); 1149 set_objfile_data (objfile, dwarf2_objfile_data_key, data); 1150 dwarf2_per_objfile = data; 1151 1152 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections, NULL); 1153 dwarf2_per_objfile->objfile = objfile; 1154 } 1155 return (dwarf2_per_objfile->info.asection != NULL 1156 && dwarf2_per_objfile->abbrev.asection != NULL); 1157 } 1158 1159 /* When loading sections, we can either look for ".<name>", or for 1160 * ".z<name>", which indicates a compressed section. */ 1161 1162 static int 1163 section_is_p (const char *section_name, const char *name) 1164 { 1165 return (section_name[0] == '.' 1166 && (strcmp (section_name + 1, name) == 0 1167 || (section_name[1] == 'z' 1168 && strcmp (section_name + 2, name) == 0))); 1169 } 1170 1171 /* This function is mapped across the sections and remembers the 1172 offset and size of each of the debugging sections we are interested 1173 in. */ 1174 1175 static void 1176 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *ignore_ptr) 1177 { 1178 if (section_is_p (sectp->name, INFO_SECTION)) 1179 { 1180 dwarf2_per_objfile->info.asection = sectp; 1181 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp); 1182 } 1183 else if (section_is_p (sectp->name, ABBREV_SECTION)) 1184 { 1185 dwarf2_per_objfile->abbrev.asection = sectp; 1186 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp); 1187 } 1188 else if (section_is_p (sectp->name, LINE_SECTION)) 1189 { 1190 dwarf2_per_objfile->line.asection = sectp; 1191 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp); 1192 } 1193 else if (section_is_p (sectp->name, LOC_SECTION)) 1194 { 1195 dwarf2_per_objfile->loc.asection = sectp; 1196 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp); 1197 } 1198 else if (section_is_p (sectp->name, MACINFO_SECTION)) 1199 { 1200 dwarf2_per_objfile->macinfo.asection = sectp; 1201 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp); 1202 } 1203 else if (section_is_p (sectp->name, STR_SECTION)) 1204 { 1205 dwarf2_per_objfile->str.asection = sectp; 1206 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp); 1207 } 1208 else if (section_is_p (sectp->name, FRAME_SECTION)) 1209 { 1210 dwarf2_per_objfile->frame.asection = sectp; 1211 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp); 1212 } 1213 else if (section_is_p (sectp->name, EH_FRAME_SECTION)) 1214 { 1215 flagword aflag = bfd_get_section_flags (ignore_abfd, sectp); 1216 1217 if (aflag & SEC_HAS_CONTENTS) 1218 { 1219 dwarf2_per_objfile->eh_frame.asection = sectp; 1220 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp); 1221 } 1222 } 1223 else if (section_is_p (sectp->name, RANGES_SECTION)) 1224 { 1225 dwarf2_per_objfile->ranges.asection = sectp; 1226 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp); 1227 } 1228 else if (section_is_p (sectp->name, TYPES_SECTION)) 1229 { 1230 dwarf2_per_objfile->types.asection = sectp; 1231 dwarf2_per_objfile->types.size = bfd_get_section_size (sectp); 1232 } 1233 1234 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD) 1235 && bfd_section_vma (abfd, sectp) == 0) 1236 dwarf2_per_objfile->has_section_at_zero = 1; 1237 } 1238 1239 /* Decompress a section that was compressed using zlib. Store the 1240 decompressed buffer, and its size, in OUTBUF and OUTSIZE. */ 1241 1242 static void 1243 zlib_decompress_section (struct objfile *objfile, asection *sectp, 1244 gdb_byte **outbuf, bfd_size_type *outsize) 1245 { 1246 bfd *abfd = objfile->obfd; 1247 #ifndef HAVE_ZLIB_H 1248 error (_("Support for zlib-compressed DWARF data (from '%s') " 1249 "is disabled in this copy of GDB"), 1250 bfd_get_filename (abfd)); 1251 #else 1252 bfd_size_type compressed_size = bfd_get_section_size (sectp); 1253 gdb_byte *compressed_buffer = xmalloc (compressed_size); 1254 struct cleanup *cleanup = make_cleanup (xfree, compressed_buffer); 1255 bfd_size_type uncompressed_size; 1256 gdb_byte *uncompressed_buffer; 1257 z_stream strm; 1258 int rc; 1259 int header_size = 12; 1260 1261 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0 1262 || bfd_bread (compressed_buffer, compressed_size, abfd) != compressed_size) 1263 error (_("Dwarf Error: Can't read DWARF data from '%s'"), 1264 bfd_get_filename (abfd)); 1265 1266 /* Read the zlib header. In this case, it should be "ZLIB" followed 1267 by the uncompressed section size, 8 bytes in big-endian order. */ 1268 if (compressed_size < header_size 1269 || strncmp (compressed_buffer, "ZLIB", 4) != 0) 1270 error (_("Dwarf Error: Corrupt DWARF ZLIB header from '%s'"), 1271 bfd_get_filename (abfd)); 1272 uncompressed_size = compressed_buffer[4]; uncompressed_size <<= 8; 1273 uncompressed_size += compressed_buffer[5]; uncompressed_size <<= 8; 1274 uncompressed_size += compressed_buffer[6]; uncompressed_size <<= 8; 1275 uncompressed_size += compressed_buffer[7]; uncompressed_size <<= 8; 1276 uncompressed_size += compressed_buffer[8]; uncompressed_size <<= 8; 1277 uncompressed_size += compressed_buffer[9]; uncompressed_size <<= 8; 1278 uncompressed_size += compressed_buffer[10]; uncompressed_size <<= 8; 1279 uncompressed_size += compressed_buffer[11]; 1280 1281 /* It is possible the section consists of several compressed 1282 buffers concatenated together, so we uncompress in a loop. */ 1283 strm.zalloc = NULL; 1284 strm.zfree = NULL; 1285 strm.opaque = NULL; 1286 strm.avail_in = compressed_size - header_size; 1287 strm.next_in = (Bytef*) compressed_buffer + header_size; 1288 strm.avail_out = uncompressed_size; 1289 uncompressed_buffer = obstack_alloc (&objfile->objfile_obstack, 1290 uncompressed_size); 1291 rc = inflateInit (&strm); 1292 while (strm.avail_in > 0) 1293 { 1294 if (rc != Z_OK) 1295 error (_("Dwarf Error: setting up DWARF uncompression in '%s': %d"), 1296 bfd_get_filename (abfd), rc); 1297 strm.next_out = ((Bytef*) uncompressed_buffer 1298 + (uncompressed_size - strm.avail_out)); 1299 rc = inflate (&strm, Z_FINISH); 1300 if (rc != Z_STREAM_END) 1301 error (_("Dwarf Error: zlib error uncompressing from '%s': %d"), 1302 bfd_get_filename (abfd), rc); 1303 rc = inflateReset (&strm); 1304 } 1305 rc = inflateEnd (&strm); 1306 if (rc != Z_OK 1307 || strm.avail_out != 0) 1308 error (_("Dwarf Error: concluding DWARF uncompression in '%s': %d"), 1309 bfd_get_filename (abfd), rc); 1310 1311 do_cleanups (cleanup); 1312 *outbuf = uncompressed_buffer; 1313 *outsize = uncompressed_size; 1314 #endif 1315 } 1316 1317 /* Read the contents of the section SECTP from object file specified by 1318 OBJFILE, store info about the section into INFO. 1319 If the section is compressed, uncompress it before returning. */ 1320 1321 static void 1322 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info) 1323 { 1324 bfd *abfd = objfile->obfd; 1325 asection *sectp = info->asection; 1326 gdb_byte *buf, *retbuf; 1327 unsigned char header[4]; 1328 1329 if (info->readin) 1330 return; 1331 info->buffer = NULL; 1332 info->was_mmapped = 0; 1333 info->readin = 1; 1334 1335 if (info->asection == NULL || info->size == 0) 1336 return; 1337 1338 /* Check if the file has a 4-byte header indicating compression. */ 1339 if (info->size > sizeof (header) 1340 && bfd_seek (abfd, sectp->filepos, SEEK_SET) == 0 1341 && bfd_bread (header, sizeof (header), abfd) == sizeof (header)) 1342 { 1343 /* Upon decompression, update the buffer and its size. */ 1344 if (strncmp (header, "ZLIB", sizeof (header)) == 0) 1345 { 1346 zlib_decompress_section (objfile, sectp, &info->buffer, 1347 &info->size); 1348 return; 1349 } 1350 } 1351 1352 #ifdef HAVE_MMAP 1353 if (pagesize == 0) 1354 pagesize = getpagesize (); 1355 1356 /* Only try to mmap sections which are large enough: we don't want to 1357 waste space due to fragmentation. Also, only try mmap for sections 1358 without relocations. */ 1359 1360 if (info->size > 4 * pagesize && (sectp->flags & SEC_RELOC) == 0) 1361 { 1362 off_t pg_offset = sectp->filepos & ~(pagesize - 1); 1363 size_t map_length = info->size + sectp->filepos - pg_offset; 1364 caddr_t retbuf = bfd_mmap (abfd, 0, map_length, PROT_READ, 1365 MAP_PRIVATE, pg_offset); 1366 1367 if (retbuf != MAP_FAILED) 1368 { 1369 info->was_mmapped = 1; 1370 info->buffer = retbuf + (sectp->filepos & (pagesize - 1)) ; 1371 #if HAVE_POSIX_MADVISE 1372 posix_madvise (retbuf, map_length, POSIX_MADV_WILLNEED); 1373 #endif 1374 return; 1375 } 1376 } 1377 #endif 1378 1379 /* If we get here, we are a normal, not-compressed section. */ 1380 info->buffer = buf 1381 = obstack_alloc (&objfile->objfile_obstack, info->size); 1382 1383 /* When debugging .o files, we may need to apply relocations; see 1384 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html . 1385 We never compress sections in .o files, so we only need to 1386 try this when the section is not compressed. */ 1387 retbuf = symfile_relocate_debug_section (objfile, sectp, buf); 1388 if (retbuf != NULL) 1389 { 1390 info->buffer = retbuf; 1391 return; 1392 } 1393 1394 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0 1395 || bfd_bread (buf, info->size, abfd) != info->size) 1396 error (_("Dwarf Error: Can't read DWARF data from '%s'"), 1397 bfd_get_filename (abfd)); 1398 } 1399 1400 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and 1401 SECTION_NAME. */ 1402 1403 void 1404 dwarf2_get_section_info (struct objfile *objfile, const char *section_name, 1405 asection **sectp, gdb_byte **bufp, 1406 bfd_size_type *sizep) 1407 { 1408 struct dwarf2_per_objfile *data 1409 = objfile_data (objfile, dwarf2_objfile_data_key); 1410 struct dwarf2_section_info *info; 1411 1412 /* We may see an objfile without any DWARF, in which case we just 1413 return nothing. */ 1414 if (data == NULL) 1415 { 1416 *sectp = NULL; 1417 *bufp = NULL; 1418 *sizep = 0; 1419 return; 1420 } 1421 if (section_is_p (section_name, EH_FRAME_SECTION)) 1422 info = &data->eh_frame; 1423 else if (section_is_p (section_name, FRAME_SECTION)) 1424 info = &data->frame; 1425 else 1426 gdb_assert (0); 1427 1428 if (info->asection != NULL && info->size != 0 && info->buffer == NULL) 1429 /* We haven't read this section in yet. Do it now. */ 1430 dwarf2_read_section (objfile, info); 1431 1432 *sectp = info->asection; 1433 *bufp = info->buffer; 1434 *sizep = info->size; 1435 } 1436 1437 /* Build a partial symbol table. */ 1438 1439 void 1440 dwarf2_build_psymtabs (struct objfile *objfile) 1441 { 1442 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0) 1443 { 1444 init_psymbol_list (objfile, 1024); 1445 } 1446 1447 dwarf2_build_psymtabs_hard (objfile); 1448 } 1449 1450 /* Return TRUE if OFFSET is within CU_HEADER. */ 1451 1452 static inline int 1453 offset_in_cu_p (const struct comp_unit_head *cu_header, unsigned int offset) 1454 { 1455 unsigned int bottom = cu_header->offset; 1456 unsigned int top = (cu_header->offset 1457 + cu_header->length 1458 + cu_header->initial_length_size); 1459 1460 return (offset >= bottom && offset < top); 1461 } 1462 1463 /* Read in the comp unit header information from the debug_info at info_ptr. 1464 NOTE: This leaves members offset, first_die_offset to be filled in 1465 by the caller. */ 1466 1467 static gdb_byte * 1468 read_comp_unit_head (struct comp_unit_head *cu_header, 1469 gdb_byte *info_ptr, bfd *abfd) 1470 { 1471 int signed_addr; 1472 unsigned int bytes_read; 1473 1474 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read); 1475 cu_header->initial_length_size = bytes_read; 1476 cu_header->offset_size = (bytes_read == 4) ? 4 : 8; 1477 info_ptr += bytes_read; 1478 cu_header->version = read_2_bytes (abfd, info_ptr); 1479 info_ptr += 2; 1480 cu_header->abbrev_offset = read_offset (abfd, info_ptr, cu_header, 1481 &bytes_read); 1482 info_ptr += bytes_read; 1483 cu_header->addr_size = read_1_byte (abfd, info_ptr); 1484 info_ptr += 1; 1485 signed_addr = bfd_get_sign_extend_vma (abfd); 1486 if (signed_addr < 0) 1487 internal_error (__FILE__, __LINE__, 1488 _("read_comp_unit_head: dwarf from non elf file")); 1489 cu_header->signed_addr_p = signed_addr; 1490 1491 return info_ptr; 1492 } 1493 1494 static gdb_byte * 1495 partial_read_comp_unit_head (struct comp_unit_head *header, gdb_byte *info_ptr, 1496 gdb_byte *buffer, unsigned int buffer_size, 1497 bfd *abfd) 1498 { 1499 gdb_byte *beg_of_comp_unit = info_ptr; 1500 1501 info_ptr = read_comp_unit_head (header, info_ptr, abfd); 1502 1503 if (header->version != 2 && header->version != 3 && header->version != 4) 1504 error (_("Dwarf Error: wrong version in compilation unit header " 1505 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version, 1506 bfd_get_filename (abfd)); 1507 1508 if (header->abbrev_offset >= dwarf2_per_objfile->abbrev.size) 1509 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header " 1510 "(offset 0x%lx + 6) [in module %s]"), 1511 (long) header->abbrev_offset, 1512 (long) (beg_of_comp_unit - buffer), 1513 bfd_get_filename (abfd)); 1514 1515 if (beg_of_comp_unit + header->length + header->initial_length_size 1516 > buffer + buffer_size) 1517 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header " 1518 "(offset 0x%lx + 0) [in module %s]"), 1519 (long) header->length, 1520 (long) (beg_of_comp_unit - buffer), 1521 bfd_get_filename (abfd)); 1522 1523 return info_ptr; 1524 } 1525 1526 /* Read in the types comp unit header information from .debug_types entry at 1527 types_ptr. The result is a pointer to one past the end of the header. */ 1528 1529 static gdb_byte * 1530 read_type_comp_unit_head (struct comp_unit_head *cu_header, 1531 ULONGEST *signature, 1532 gdb_byte *types_ptr, bfd *abfd) 1533 { 1534 gdb_byte *initial_types_ptr = types_ptr; 1535 1536 dwarf2_read_section (dwarf2_per_objfile->objfile, 1537 &dwarf2_per_objfile->types); 1538 cu_header->offset = types_ptr - dwarf2_per_objfile->types.buffer; 1539 1540 types_ptr = read_comp_unit_head (cu_header, types_ptr, abfd); 1541 1542 *signature = read_8_bytes (abfd, types_ptr); 1543 types_ptr += 8; 1544 types_ptr += cu_header->offset_size; 1545 cu_header->first_die_offset = types_ptr - initial_types_ptr; 1546 1547 return types_ptr; 1548 } 1549 1550 /* Allocate a new partial symtab for file named NAME and mark this new 1551 partial symtab as being an include of PST. */ 1552 1553 static void 1554 dwarf2_create_include_psymtab (char *name, struct partial_symtab *pst, 1555 struct objfile *objfile) 1556 { 1557 struct partial_symtab *subpst = allocate_psymtab (name, objfile); 1558 1559 subpst->section_offsets = pst->section_offsets; 1560 subpst->textlow = 0; 1561 subpst->texthigh = 0; 1562 1563 subpst->dependencies = (struct partial_symtab **) 1564 obstack_alloc (&objfile->objfile_obstack, 1565 sizeof (struct partial_symtab *)); 1566 subpst->dependencies[0] = pst; 1567 subpst->number_of_dependencies = 1; 1568 1569 subpst->globals_offset = 0; 1570 subpst->n_global_syms = 0; 1571 subpst->statics_offset = 0; 1572 subpst->n_static_syms = 0; 1573 subpst->symtab = NULL; 1574 subpst->read_symtab = pst->read_symtab; 1575 subpst->readin = 0; 1576 1577 /* No private part is necessary for include psymtabs. This property 1578 can be used to differentiate between such include psymtabs and 1579 the regular ones. */ 1580 subpst->read_symtab_private = NULL; 1581 } 1582 1583 /* Read the Line Number Program data and extract the list of files 1584 included by the source file represented by PST. Build an include 1585 partial symtab for each of these included files. */ 1586 1587 static void 1588 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu, 1589 struct die_info *die, 1590 struct partial_symtab *pst) 1591 { 1592 struct objfile *objfile = cu->objfile; 1593 bfd *abfd = objfile->obfd; 1594 struct line_header *lh = NULL; 1595 struct attribute *attr; 1596 1597 attr = dwarf2_attr (die, DW_AT_stmt_list, cu); 1598 if (attr) 1599 { 1600 unsigned int line_offset = DW_UNSND (attr); 1601 1602 lh = dwarf_decode_line_header (line_offset, abfd, cu); 1603 } 1604 if (lh == NULL) 1605 return; /* No linetable, so no includes. */ 1606 1607 dwarf_decode_lines (lh, NULL, abfd, cu, pst); 1608 1609 free_line_header (lh); 1610 } 1611 1612 static hashval_t 1613 hash_type_signature (const void *item) 1614 { 1615 const struct signatured_type *type_sig = item; 1616 1617 /* This drops the top 32 bits of the signature, but is ok for a hash. */ 1618 return type_sig->signature; 1619 } 1620 1621 static int 1622 eq_type_signature (const void *item_lhs, const void *item_rhs) 1623 { 1624 const struct signatured_type *lhs = item_lhs; 1625 const struct signatured_type *rhs = item_rhs; 1626 1627 return lhs->signature == rhs->signature; 1628 } 1629 1630 /* Create the hash table of all entries in the .debug_types section. 1631 The result is zero if there is an error (e.g. missing .debug_types section), 1632 otherwise non-zero. */ 1633 1634 static int 1635 create_debug_types_hash_table (struct objfile *objfile) 1636 { 1637 gdb_byte *info_ptr; 1638 htab_t types_htab; 1639 1640 dwarf2_read_section (objfile, &dwarf2_per_objfile->types); 1641 info_ptr = dwarf2_per_objfile->types.buffer; 1642 1643 if (info_ptr == NULL) 1644 { 1645 dwarf2_per_objfile->signatured_types = NULL; 1646 return 0; 1647 } 1648 1649 types_htab = htab_create_alloc_ex (41, 1650 hash_type_signature, 1651 eq_type_signature, 1652 NULL, 1653 &objfile->objfile_obstack, 1654 hashtab_obstack_allocate, 1655 dummy_obstack_deallocate); 1656 1657 if (dwarf2_die_debug) 1658 fprintf_unfiltered (gdb_stdlog, "Signatured types:\n"); 1659 1660 while (info_ptr < dwarf2_per_objfile->types.buffer + dwarf2_per_objfile->types.size) 1661 { 1662 unsigned int offset; 1663 unsigned int offset_size; 1664 unsigned int type_offset; 1665 unsigned int length, initial_length_size; 1666 unsigned short version; 1667 ULONGEST signature; 1668 struct signatured_type *type_sig; 1669 void **slot; 1670 gdb_byte *ptr = info_ptr; 1671 1672 offset = ptr - dwarf2_per_objfile->types.buffer; 1673 1674 /* We need to read the type's signature in order to build the hash 1675 table, but we don't need to read anything else just yet. */ 1676 1677 /* Sanity check to ensure entire cu is present. */ 1678 length = read_initial_length (objfile->obfd, ptr, &initial_length_size); 1679 if (ptr + length + initial_length_size 1680 > dwarf2_per_objfile->types.buffer + dwarf2_per_objfile->types.size) 1681 { 1682 complaint (&symfile_complaints, 1683 _("debug type entry runs off end of `.debug_types' section, ignored")); 1684 break; 1685 } 1686 1687 offset_size = initial_length_size == 4 ? 4 : 8; 1688 ptr += initial_length_size; 1689 version = bfd_get_16 (objfile->obfd, ptr); 1690 ptr += 2; 1691 ptr += offset_size; /* abbrev offset */ 1692 ptr += 1; /* address size */ 1693 signature = bfd_get_64 (objfile->obfd, ptr); 1694 ptr += 8; 1695 type_offset = read_offset_1 (objfile->obfd, ptr, offset_size); 1696 1697 type_sig = obstack_alloc (&objfile->objfile_obstack, sizeof (*type_sig)); 1698 memset (type_sig, 0, sizeof (*type_sig)); 1699 type_sig->signature = signature; 1700 type_sig->offset = offset; 1701 type_sig->type_offset = type_offset; 1702 1703 slot = htab_find_slot (types_htab, type_sig, INSERT); 1704 gdb_assert (slot != NULL); 1705 *slot = type_sig; 1706 1707 if (dwarf2_die_debug) 1708 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature 0x%s\n", 1709 offset, phex (signature, sizeof (signature))); 1710 1711 info_ptr = info_ptr + initial_length_size + length; 1712 } 1713 1714 dwarf2_per_objfile->signatured_types = types_htab; 1715 1716 return 1; 1717 } 1718 1719 /* Lookup a signature based type. 1720 Returns NULL if SIG is not present in the table. */ 1721 1722 static struct signatured_type * 1723 lookup_signatured_type (struct objfile *objfile, ULONGEST sig) 1724 { 1725 struct signatured_type find_entry, *entry; 1726 1727 if (dwarf2_per_objfile->signatured_types == NULL) 1728 { 1729 complaint (&symfile_complaints, 1730 _("missing `.debug_types' section for DW_FORM_sig8 die")); 1731 return 0; 1732 } 1733 1734 find_entry.signature = sig; 1735 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry); 1736 return entry; 1737 } 1738 1739 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */ 1740 1741 static void 1742 init_cu_die_reader (struct die_reader_specs *reader, 1743 struct dwarf2_cu *cu) 1744 { 1745 reader->abfd = cu->objfile->obfd; 1746 reader->cu = cu; 1747 if (cu->per_cu->from_debug_types) 1748 { 1749 gdb_assert (dwarf2_per_objfile->types.readin); 1750 reader->buffer = dwarf2_per_objfile->types.buffer; 1751 } 1752 else 1753 { 1754 gdb_assert (dwarf2_per_objfile->info.readin); 1755 reader->buffer = dwarf2_per_objfile->info.buffer; 1756 } 1757 } 1758 1759 /* Find the base address of the compilation unit for range lists and 1760 location lists. It will normally be specified by DW_AT_low_pc. 1761 In DWARF-3 draft 4, the base address could be overridden by 1762 DW_AT_entry_pc. It's been removed, but GCC still uses this for 1763 compilation units with discontinuous ranges. */ 1764 1765 static void 1766 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu) 1767 { 1768 struct attribute *attr; 1769 1770 cu->base_known = 0; 1771 cu->base_address = 0; 1772 1773 attr = dwarf2_attr (die, DW_AT_entry_pc, cu); 1774 if (attr) 1775 { 1776 cu->base_address = DW_ADDR (attr); 1777 cu->base_known = 1; 1778 } 1779 else 1780 { 1781 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 1782 if (attr) 1783 { 1784 cu->base_address = DW_ADDR (attr); 1785 cu->base_known = 1; 1786 } 1787 } 1788 } 1789 1790 /* Subroutine of process_type_comp_unit and dwarf2_build_psymtabs_hard 1791 to combine the common parts. 1792 Process a compilation unit for a psymtab. 1793 BUFFER is a pointer to the beginning of the dwarf section buffer, 1794 either .debug_info or debug_types. 1795 INFO_PTR is a pointer to the start of the CU. 1796 Returns a pointer to the next CU. */ 1797 1798 static gdb_byte * 1799 process_psymtab_comp_unit (struct objfile *objfile, 1800 struct dwarf2_per_cu_data *this_cu, 1801 gdb_byte *buffer, gdb_byte *info_ptr, 1802 unsigned int buffer_size) 1803 { 1804 bfd *abfd = objfile->obfd; 1805 gdb_byte *beg_of_comp_unit = info_ptr; 1806 struct die_info *comp_unit_die; 1807 struct partial_symtab *pst; 1808 CORE_ADDR baseaddr; 1809 struct cleanup *back_to_inner; 1810 struct dwarf2_cu cu; 1811 int has_children, has_pc_info; 1812 struct attribute *attr; 1813 CORE_ADDR best_lowpc = 0, best_highpc = 0; 1814 struct die_reader_specs reader_specs; 1815 1816 memset (&cu, 0, sizeof (cu)); 1817 cu.objfile = objfile; 1818 obstack_init (&cu.comp_unit_obstack); 1819 1820 back_to_inner = make_cleanup (free_stack_comp_unit, &cu); 1821 1822 info_ptr = partial_read_comp_unit_head (&cu.header, info_ptr, 1823 buffer, buffer_size, 1824 abfd); 1825 1826 /* Complete the cu_header. */ 1827 cu.header.offset = beg_of_comp_unit - buffer; 1828 cu.header.first_die_offset = info_ptr - beg_of_comp_unit; 1829 1830 cu.list_in_scope = &file_symbols; 1831 1832 /* If this compilation unit was already read in, free the 1833 cached copy in order to read it in again. This is 1834 necessary because we skipped some symbols when we first 1835 read in the compilation unit (see load_partial_dies). 1836 This problem could be avoided, but the benefit is 1837 unclear. */ 1838 if (this_cu->cu != NULL) 1839 free_one_cached_comp_unit (this_cu->cu); 1840 1841 /* Note that this is a pointer to our stack frame, being 1842 added to a global data structure. It will be cleaned up 1843 in free_stack_comp_unit when we finish with this 1844 compilation unit. */ 1845 this_cu->cu = &cu; 1846 cu.per_cu = this_cu; 1847 1848 /* Read the abbrevs for this compilation unit into a table. */ 1849 dwarf2_read_abbrevs (abfd, &cu); 1850 make_cleanup (dwarf2_free_abbrev_table, &cu); 1851 1852 /* Read the compilation unit die. */ 1853 if (this_cu->from_debug_types) 1854 info_ptr += 8 /*signature*/ + cu.header.offset_size; 1855 init_cu_die_reader (&reader_specs, &cu); 1856 info_ptr = read_full_die (&reader_specs, &comp_unit_die, info_ptr, 1857 &has_children); 1858 1859 if (this_cu->from_debug_types) 1860 { 1861 /* offset,length haven't been set yet for type units. */ 1862 this_cu->offset = cu.header.offset; 1863 this_cu->length = cu.header.length + cu.header.initial_length_size; 1864 } 1865 else if (comp_unit_die->tag == DW_TAG_partial_unit) 1866 { 1867 info_ptr = (beg_of_comp_unit + cu.header.length 1868 + cu.header.initial_length_size); 1869 do_cleanups (back_to_inner); 1870 return info_ptr; 1871 } 1872 1873 /* Set the language we're debugging. */ 1874 attr = dwarf2_attr (comp_unit_die, DW_AT_language, &cu); 1875 if (attr) 1876 set_cu_language (DW_UNSND (attr), &cu); 1877 else 1878 set_cu_language (language_minimal, &cu); 1879 1880 /* Allocate a new partial symbol table structure. */ 1881 attr = dwarf2_attr (comp_unit_die, DW_AT_name, &cu); 1882 pst = start_psymtab_common (objfile, objfile->section_offsets, 1883 (attr != NULL) ? DW_STRING (attr) : "", 1884 /* TEXTLOW and TEXTHIGH are set below. */ 1885 0, 1886 objfile->global_psymbols.next, 1887 objfile->static_psymbols.next); 1888 1889 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, &cu); 1890 if (attr != NULL) 1891 pst->dirname = DW_STRING (attr); 1892 1893 pst->read_symtab_private = this_cu; 1894 1895 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 1896 1897 /* Store the function that reads in the rest of the symbol table */ 1898 pst->read_symtab = dwarf2_psymtab_to_symtab; 1899 1900 this_cu->psymtab = pst; 1901 1902 dwarf2_find_base_address (comp_unit_die, &cu); 1903 1904 /* Possibly set the default values of LOWPC and HIGHPC from 1905 `DW_AT_ranges'. */ 1906 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc, 1907 &best_highpc, &cu, pst); 1908 if (has_pc_info == 1 && best_lowpc < best_highpc) 1909 /* Store the contiguous range if it is not empty; it can be empty for 1910 CUs with no code. */ 1911 addrmap_set_empty (objfile->psymtabs_addrmap, 1912 best_lowpc + baseaddr, 1913 best_highpc + baseaddr - 1, pst); 1914 1915 /* Check if comp unit has_children. 1916 If so, read the rest of the partial symbols from this comp unit. 1917 If not, there's no more debug_info for this comp unit. */ 1918 if (has_children) 1919 { 1920 struct partial_die_info *first_die; 1921 CORE_ADDR lowpc, highpc; 1922 1923 lowpc = ((CORE_ADDR) -1); 1924 highpc = ((CORE_ADDR) 0); 1925 1926 first_die = load_partial_dies (abfd, buffer, info_ptr, 1, &cu); 1927 1928 scan_partial_symbols (first_die, &lowpc, &highpc, 1929 ! has_pc_info, &cu); 1930 1931 /* If we didn't find a lowpc, set it to highpc to avoid 1932 complaints from `maint check'. */ 1933 if (lowpc == ((CORE_ADDR) -1)) 1934 lowpc = highpc; 1935 1936 /* If the compilation unit didn't have an explicit address range, 1937 then use the information extracted from its child dies. */ 1938 if (! has_pc_info) 1939 { 1940 best_lowpc = lowpc; 1941 best_highpc = highpc; 1942 } 1943 } 1944 pst->textlow = best_lowpc + baseaddr; 1945 pst->texthigh = best_highpc + baseaddr; 1946 1947 pst->n_global_syms = objfile->global_psymbols.next - 1948 (objfile->global_psymbols.list + pst->globals_offset); 1949 pst->n_static_syms = objfile->static_psymbols.next - 1950 (objfile->static_psymbols.list + pst->statics_offset); 1951 sort_pst_symbols (pst); 1952 1953 info_ptr = (beg_of_comp_unit + cu.header.length 1954 + cu.header.initial_length_size); 1955 1956 if (this_cu->from_debug_types) 1957 { 1958 /* It's not clear we want to do anything with stmt lists here. 1959 Waiting to see what gcc ultimately does. */ 1960 } 1961 else 1962 { 1963 /* Get the list of files included in the current compilation unit, 1964 and build a psymtab for each of them. */ 1965 dwarf2_build_include_psymtabs (&cu, comp_unit_die, pst); 1966 } 1967 1968 do_cleanups (back_to_inner); 1969 1970 return info_ptr; 1971 } 1972 1973 /* Traversal function for htab_traverse_noresize. 1974 Process one .debug_types comp-unit. */ 1975 1976 static int 1977 process_type_comp_unit (void **slot, void *info) 1978 { 1979 struct signatured_type *entry = (struct signatured_type *) *slot; 1980 struct objfile *objfile = (struct objfile *) info; 1981 struct dwarf2_per_cu_data *this_cu; 1982 1983 this_cu = &entry->per_cu; 1984 this_cu->from_debug_types = 1; 1985 1986 gdb_assert (dwarf2_per_objfile->types.readin); 1987 process_psymtab_comp_unit (objfile, this_cu, 1988 dwarf2_per_objfile->types.buffer, 1989 dwarf2_per_objfile->types.buffer + entry->offset, 1990 dwarf2_per_objfile->types.size); 1991 1992 return 1; 1993 } 1994 1995 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it. 1996 Build partial symbol tables for the .debug_types comp-units. */ 1997 1998 static void 1999 build_type_psymtabs (struct objfile *objfile) 2000 { 2001 if (! create_debug_types_hash_table (objfile)) 2002 return; 2003 2004 htab_traverse_noresize (dwarf2_per_objfile->signatured_types, 2005 process_type_comp_unit, objfile); 2006 } 2007 2008 /* A cleanup function that clears objfile's psymtabs_addrmap field. */ 2009 2010 static void 2011 psymtabs_addrmap_cleanup (void *o) 2012 { 2013 struct objfile *objfile = o; 2014 2015 objfile->psymtabs_addrmap = NULL; 2016 } 2017 2018 /* Build the partial symbol table by doing a quick pass through the 2019 .debug_info and .debug_abbrev sections. */ 2020 2021 static void 2022 dwarf2_build_psymtabs_hard (struct objfile *objfile) 2023 { 2024 gdb_byte *info_ptr; 2025 struct cleanup *back_to, *addrmap_cleanup; 2026 struct obstack temp_obstack; 2027 2028 dwarf2_read_section (objfile, &dwarf2_per_objfile->info); 2029 info_ptr = dwarf2_per_objfile->info.buffer; 2030 2031 /* Any cached compilation units will be linked by the per-objfile 2032 read_in_chain. Make sure to free them when we're done. */ 2033 back_to = make_cleanup (free_cached_comp_units, NULL); 2034 2035 build_type_psymtabs (objfile); 2036 2037 create_all_comp_units (objfile); 2038 2039 /* Create a temporary address map on a temporary obstack. We later 2040 copy this to the final obstack. */ 2041 obstack_init (&temp_obstack); 2042 make_cleanup_obstack_free (&temp_obstack); 2043 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack); 2044 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile); 2045 2046 /* Since the objects we're extracting from .debug_info vary in 2047 length, only the individual functions to extract them (like 2048 read_comp_unit_head and load_partial_die) can really know whether 2049 the buffer is large enough to hold another complete object. 2050 2051 At the moment, they don't actually check that. If .debug_info 2052 holds just one extra byte after the last compilation unit's dies, 2053 then read_comp_unit_head will happily read off the end of the 2054 buffer. read_partial_die is similarly casual. Those functions 2055 should be fixed. 2056 2057 For this loop condition, simply checking whether there's any data 2058 left at all should be sufficient. */ 2059 2060 while (info_ptr < (dwarf2_per_objfile->info.buffer 2061 + dwarf2_per_objfile->info.size)) 2062 { 2063 struct dwarf2_per_cu_data *this_cu; 2064 2065 this_cu = dwarf2_find_comp_unit (info_ptr - dwarf2_per_objfile->info.buffer, 2066 objfile); 2067 2068 info_ptr = process_psymtab_comp_unit (objfile, this_cu, 2069 dwarf2_per_objfile->info.buffer, 2070 info_ptr, 2071 dwarf2_per_objfile->info.size); 2072 } 2073 2074 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap, 2075 &objfile->objfile_obstack); 2076 discard_cleanups (addrmap_cleanup); 2077 2078 do_cleanups (back_to); 2079 } 2080 2081 /* Load the partial DIEs for a secondary CU into memory. */ 2082 2083 static void 2084 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu, 2085 struct objfile *objfile) 2086 { 2087 bfd *abfd = objfile->obfd; 2088 gdb_byte *info_ptr, *beg_of_comp_unit; 2089 struct die_info *comp_unit_die; 2090 struct dwarf2_cu *cu; 2091 struct cleanup *back_to; 2092 struct attribute *attr; 2093 int has_children; 2094 struct die_reader_specs reader_specs; 2095 2096 gdb_assert (! this_cu->from_debug_types); 2097 2098 gdb_assert (dwarf2_per_objfile->info.readin); 2099 info_ptr = dwarf2_per_objfile->info.buffer + this_cu->offset; 2100 beg_of_comp_unit = info_ptr; 2101 2102 cu = alloc_one_comp_unit (objfile); 2103 2104 /* ??? Missing cleanup for CU? */ 2105 2106 /* Link this compilation unit into the compilation unit tree. */ 2107 this_cu->cu = cu; 2108 cu->per_cu = this_cu; 2109 cu->type_hash = this_cu->type_hash; 2110 2111 info_ptr = partial_read_comp_unit_head (&cu->header, info_ptr, 2112 dwarf2_per_objfile->info.buffer, 2113 dwarf2_per_objfile->info.size, 2114 abfd); 2115 2116 /* Complete the cu_header. */ 2117 cu->header.offset = this_cu->offset; 2118 cu->header.first_die_offset = info_ptr - beg_of_comp_unit; 2119 2120 /* Read the abbrevs for this compilation unit into a table. */ 2121 dwarf2_read_abbrevs (abfd, cu); 2122 back_to = make_cleanup (dwarf2_free_abbrev_table, cu); 2123 2124 /* Read the compilation unit die. */ 2125 init_cu_die_reader (&reader_specs, cu); 2126 info_ptr = read_full_die (&reader_specs, &comp_unit_die, info_ptr, 2127 &has_children); 2128 2129 /* Set the language we're debugging. */ 2130 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu); 2131 if (attr) 2132 set_cu_language (DW_UNSND (attr), cu); 2133 else 2134 set_cu_language (language_minimal, cu); 2135 2136 /* Check if comp unit has_children. 2137 If so, read the rest of the partial symbols from this comp unit. 2138 If not, there's no more debug_info for this comp unit. */ 2139 if (has_children) 2140 load_partial_dies (abfd, dwarf2_per_objfile->info.buffer, info_ptr, 0, cu); 2141 2142 do_cleanups (back_to); 2143 } 2144 2145 /* Create a list of all compilation units in OBJFILE. We do this only 2146 if an inter-comp-unit reference is found; presumably if there is one, 2147 there will be many, and one will occur early in the .debug_info section. 2148 So there's no point in building this list incrementally. */ 2149 2150 static void 2151 create_all_comp_units (struct objfile *objfile) 2152 { 2153 int n_allocated; 2154 int n_comp_units; 2155 struct dwarf2_per_cu_data **all_comp_units; 2156 gdb_byte *info_ptr; 2157 2158 dwarf2_read_section (objfile, &dwarf2_per_objfile->info); 2159 info_ptr = dwarf2_per_objfile->info.buffer; 2160 2161 n_comp_units = 0; 2162 n_allocated = 10; 2163 all_comp_units = xmalloc (n_allocated 2164 * sizeof (struct dwarf2_per_cu_data *)); 2165 2166 while (info_ptr < dwarf2_per_objfile->info.buffer + dwarf2_per_objfile->info.size) 2167 { 2168 unsigned int length, initial_length_size; 2169 struct dwarf2_per_cu_data *this_cu; 2170 unsigned int offset; 2171 2172 offset = info_ptr - dwarf2_per_objfile->info.buffer; 2173 2174 /* Read just enough information to find out where the next 2175 compilation unit is. */ 2176 length = read_initial_length (objfile->obfd, info_ptr, 2177 &initial_length_size); 2178 2179 /* Save the compilation unit for later lookup. */ 2180 this_cu = obstack_alloc (&objfile->objfile_obstack, 2181 sizeof (struct dwarf2_per_cu_data)); 2182 memset (this_cu, 0, sizeof (*this_cu)); 2183 this_cu->offset = offset; 2184 this_cu->length = length + initial_length_size; 2185 2186 if (n_comp_units == n_allocated) 2187 { 2188 n_allocated *= 2; 2189 all_comp_units = xrealloc (all_comp_units, 2190 n_allocated 2191 * sizeof (struct dwarf2_per_cu_data *)); 2192 } 2193 all_comp_units[n_comp_units++] = this_cu; 2194 2195 info_ptr = info_ptr + this_cu->length; 2196 } 2197 2198 dwarf2_per_objfile->all_comp_units 2199 = obstack_alloc (&objfile->objfile_obstack, 2200 n_comp_units * sizeof (struct dwarf2_per_cu_data *)); 2201 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units, 2202 n_comp_units * sizeof (struct dwarf2_per_cu_data *)); 2203 xfree (all_comp_units); 2204 dwarf2_per_objfile->n_comp_units = n_comp_units; 2205 } 2206 2207 /* Process all loaded DIEs for compilation unit CU, starting at 2208 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation 2209 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or 2210 DW_AT_ranges). If NEED_PC is set, then this function will set 2211 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU 2212 and record the covered ranges in the addrmap. */ 2213 2214 static void 2215 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc, 2216 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu) 2217 { 2218 struct partial_die_info *pdi; 2219 2220 /* Now, march along the PDI's, descending into ones which have 2221 interesting children but skipping the children of the other ones, 2222 until we reach the end of the compilation unit. */ 2223 2224 pdi = first_die; 2225 2226 while (pdi != NULL) 2227 { 2228 fixup_partial_die (pdi, cu); 2229 2230 /* Anonymous namespaces or modules have no name but have interesting 2231 children, so we need to look at them. Ditto for anonymous 2232 enums. */ 2233 2234 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace 2235 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type) 2236 { 2237 switch (pdi->tag) 2238 { 2239 case DW_TAG_subprogram: 2240 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu); 2241 break; 2242 case DW_TAG_variable: 2243 case DW_TAG_typedef: 2244 case DW_TAG_union_type: 2245 if (!pdi->is_declaration) 2246 { 2247 add_partial_symbol (pdi, cu); 2248 } 2249 break; 2250 case DW_TAG_class_type: 2251 case DW_TAG_interface_type: 2252 case DW_TAG_structure_type: 2253 if (!pdi->is_declaration) 2254 { 2255 add_partial_symbol (pdi, cu); 2256 } 2257 break; 2258 case DW_TAG_enumeration_type: 2259 if (!pdi->is_declaration) 2260 add_partial_enumeration (pdi, cu); 2261 break; 2262 case DW_TAG_base_type: 2263 case DW_TAG_subrange_type: 2264 /* File scope base type definitions are added to the partial 2265 symbol table. */ 2266 add_partial_symbol (pdi, cu); 2267 break; 2268 case DW_TAG_namespace: 2269 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu); 2270 break; 2271 case DW_TAG_module: 2272 add_partial_module (pdi, lowpc, highpc, need_pc, cu); 2273 break; 2274 default: 2275 break; 2276 } 2277 } 2278 2279 /* If the die has a sibling, skip to the sibling. */ 2280 2281 pdi = pdi->die_sibling; 2282 } 2283 } 2284 2285 /* Functions used to compute the fully scoped name of a partial DIE. 2286 2287 Normally, this is simple. For C++, the parent DIE's fully scoped 2288 name is concatenated with "::" and the partial DIE's name. For 2289 Java, the same thing occurs except that "." is used instead of "::". 2290 Enumerators are an exception; they use the scope of their parent 2291 enumeration type, i.e. the name of the enumeration type is not 2292 prepended to the enumerator. 2293 2294 There are two complexities. One is DW_AT_specification; in this 2295 case "parent" means the parent of the target of the specification, 2296 instead of the direct parent of the DIE. The other is compilers 2297 which do not emit DW_TAG_namespace; in this case we try to guess 2298 the fully qualified name of structure types from their members' 2299 linkage names. This must be done using the DIE's children rather 2300 than the children of any DW_AT_specification target. We only need 2301 to do this for structures at the top level, i.e. if the target of 2302 any DW_AT_specification (if any; otherwise the DIE itself) does not 2303 have a parent. */ 2304 2305 /* Compute the scope prefix associated with PDI's parent, in 2306 compilation unit CU. The result will be allocated on CU's 2307 comp_unit_obstack, or a copy of the already allocated PDI->NAME 2308 field. NULL is returned if no prefix is necessary. */ 2309 static char * 2310 partial_die_parent_scope (struct partial_die_info *pdi, 2311 struct dwarf2_cu *cu) 2312 { 2313 char *grandparent_scope; 2314 struct partial_die_info *parent, *real_pdi; 2315 2316 /* We need to look at our parent DIE; if we have a DW_AT_specification, 2317 then this means the parent of the specification DIE. */ 2318 2319 real_pdi = pdi; 2320 while (real_pdi->has_specification) 2321 real_pdi = find_partial_die (real_pdi->spec_offset, cu); 2322 2323 parent = real_pdi->die_parent; 2324 if (parent == NULL) 2325 return NULL; 2326 2327 if (parent->scope_set) 2328 return parent->scope; 2329 2330 fixup_partial_die (parent, cu); 2331 2332 grandparent_scope = partial_die_parent_scope (parent, cu); 2333 2334 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus 2335 DW_TAG_namespace DIEs with a name of "::" for the global namespace. 2336 Work around this problem here. */ 2337 if (cu->language == language_cplus 2338 && parent->tag == DW_TAG_namespace 2339 && strcmp (parent->name, "::") == 0 2340 && grandparent_scope == NULL) 2341 { 2342 parent->scope = NULL; 2343 parent->scope_set = 1; 2344 return NULL; 2345 } 2346 2347 if (parent->tag == DW_TAG_namespace 2348 || parent->tag == DW_TAG_module 2349 || parent->tag == DW_TAG_structure_type 2350 || parent->tag == DW_TAG_class_type 2351 || parent->tag == DW_TAG_interface_type 2352 || parent->tag == DW_TAG_union_type 2353 || parent->tag == DW_TAG_enumeration_type) 2354 { 2355 if (grandparent_scope == NULL) 2356 parent->scope = parent->name; 2357 else 2358 parent->scope = typename_concat (&cu->comp_unit_obstack, grandparent_scope, 2359 parent->name, 0, cu); 2360 } 2361 else if (parent->tag == DW_TAG_enumerator) 2362 /* Enumerators should not get the name of the enumeration as a prefix. */ 2363 parent->scope = grandparent_scope; 2364 else 2365 { 2366 /* FIXME drow/2004-04-01: What should we be doing with 2367 function-local names? For partial symbols, we should probably be 2368 ignoring them. */ 2369 complaint (&symfile_complaints, 2370 _("unhandled containing DIE tag %d for DIE at %d"), 2371 parent->tag, pdi->offset); 2372 parent->scope = grandparent_scope; 2373 } 2374 2375 parent->scope_set = 1; 2376 return parent->scope; 2377 } 2378 2379 /* Return the fully scoped name associated with PDI, from compilation unit 2380 CU. The result will be allocated with malloc. */ 2381 static char * 2382 partial_die_full_name (struct partial_die_info *pdi, 2383 struct dwarf2_cu *cu) 2384 { 2385 char *parent_scope; 2386 2387 parent_scope = partial_die_parent_scope (pdi, cu); 2388 if (parent_scope == NULL) 2389 return NULL; 2390 else 2391 return typename_concat (NULL, parent_scope, pdi->name, 0, cu); 2392 } 2393 2394 static void 2395 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu) 2396 { 2397 struct objfile *objfile = cu->objfile; 2398 CORE_ADDR addr = 0; 2399 char *actual_name = NULL; 2400 const struct partial_symbol *psym = NULL; 2401 CORE_ADDR baseaddr; 2402 int built_actual_name = 0; 2403 2404 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 2405 2406 actual_name = partial_die_full_name (pdi, cu); 2407 if (actual_name) 2408 built_actual_name = 1; 2409 2410 if (actual_name == NULL) 2411 actual_name = pdi->name; 2412 2413 switch (pdi->tag) 2414 { 2415 case DW_TAG_subprogram: 2416 if (pdi->is_external || cu->language == language_ada) 2417 { 2418 /* brobecker/2007-12-26: Normally, only "external" DIEs are part 2419 of the global scope. But in Ada, we want to be able to access 2420 nested procedures globally. So all Ada subprograms are stored 2421 in the global scope. */ 2422 /*prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr, 2423 mst_text, objfile); */ 2424 psym = add_psymbol_to_list (actual_name, strlen (actual_name), 2425 built_actual_name, 2426 VAR_DOMAIN, LOC_BLOCK, 2427 &objfile->global_psymbols, 2428 0, pdi->lowpc + baseaddr, 2429 cu->language, objfile); 2430 } 2431 else 2432 { 2433 /*prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr, 2434 mst_file_text, objfile); */ 2435 psym = add_psymbol_to_list (actual_name, strlen (actual_name), 2436 built_actual_name, 2437 VAR_DOMAIN, LOC_BLOCK, 2438 &objfile->static_psymbols, 2439 0, pdi->lowpc + baseaddr, 2440 cu->language, objfile); 2441 } 2442 break; 2443 case DW_TAG_variable: 2444 if (pdi->is_external) 2445 { 2446 /* Global Variable. 2447 Don't enter into the minimal symbol tables as there is 2448 a minimal symbol table entry from the ELF symbols already. 2449 Enter into partial symbol table if it has a location 2450 descriptor or a type. 2451 If the location descriptor is missing, new_symbol will create 2452 a LOC_UNRESOLVED symbol, the address of the variable will then 2453 be determined from the minimal symbol table whenever the variable 2454 is referenced. 2455 The address for the partial symbol table entry is not 2456 used by GDB, but it comes in handy for debugging partial symbol 2457 table building. */ 2458 2459 if (pdi->locdesc) 2460 addr = decode_locdesc (pdi->locdesc, cu); 2461 if (pdi->locdesc || pdi->has_type) 2462 psym = add_psymbol_to_list (actual_name, strlen (actual_name), 2463 built_actual_name, 2464 VAR_DOMAIN, LOC_STATIC, 2465 &objfile->global_psymbols, 2466 0, addr + baseaddr, 2467 cu->language, objfile); 2468 } 2469 else 2470 { 2471 /* Static Variable. Skip symbols without location descriptors. */ 2472 if (pdi->locdesc == NULL) 2473 { 2474 if (built_actual_name) 2475 xfree (actual_name); 2476 return; 2477 } 2478 addr = decode_locdesc (pdi->locdesc, cu); 2479 /*prim_record_minimal_symbol (actual_name, addr + baseaddr, 2480 mst_file_data, objfile); */ 2481 psym = add_psymbol_to_list (actual_name, strlen (actual_name), 2482 built_actual_name, 2483 VAR_DOMAIN, LOC_STATIC, 2484 &objfile->static_psymbols, 2485 0, addr + baseaddr, 2486 cu->language, objfile); 2487 } 2488 break; 2489 case DW_TAG_typedef: 2490 case DW_TAG_base_type: 2491 case DW_TAG_subrange_type: 2492 add_psymbol_to_list (actual_name, strlen (actual_name), 2493 built_actual_name, 2494 VAR_DOMAIN, LOC_TYPEDEF, 2495 &objfile->static_psymbols, 2496 0, (CORE_ADDR) 0, cu->language, objfile); 2497 break; 2498 case DW_TAG_namespace: 2499 add_psymbol_to_list (actual_name, strlen (actual_name), 2500 built_actual_name, 2501 VAR_DOMAIN, LOC_TYPEDEF, 2502 &objfile->global_psymbols, 2503 0, (CORE_ADDR) 0, cu->language, objfile); 2504 break; 2505 case DW_TAG_class_type: 2506 case DW_TAG_interface_type: 2507 case DW_TAG_structure_type: 2508 case DW_TAG_union_type: 2509 case DW_TAG_enumeration_type: 2510 /* Skip external references. The DWARF standard says in the section 2511 about "Structure, Union, and Class Type Entries": "An incomplete 2512 structure, union or class type is represented by a structure, 2513 union or class entry that does not have a byte size attribute 2514 and that has a DW_AT_declaration attribute." */ 2515 if (!pdi->has_byte_size && pdi->is_declaration) 2516 { 2517 if (built_actual_name) 2518 xfree (actual_name); 2519 return; 2520 } 2521 2522 /* NOTE: carlton/2003-10-07: See comment in new_symbol about 2523 static vs. global. */ 2524 add_psymbol_to_list (actual_name, strlen (actual_name), 2525 built_actual_name, 2526 STRUCT_DOMAIN, LOC_TYPEDEF, 2527 (cu->language == language_cplus 2528 || cu->language == language_java) 2529 ? &objfile->global_psymbols 2530 : &objfile->static_psymbols, 2531 0, (CORE_ADDR) 0, cu->language, objfile); 2532 2533 break; 2534 case DW_TAG_enumerator: 2535 add_psymbol_to_list (actual_name, strlen (actual_name), 2536 built_actual_name, 2537 VAR_DOMAIN, LOC_CONST, 2538 (cu->language == language_cplus 2539 || cu->language == language_java) 2540 ? &objfile->global_psymbols 2541 : &objfile->static_psymbols, 2542 0, (CORE_ADDR) 0, cu->language, objfile); 2543 break; 2544 default: 2545 break; 2546 } 2547 2548 if (built_actual_name) 2549 xfree (actual_name); 2550 } 2551 2552 /* Read a partial die corresponding to a namespace; also, add a symbol 2553 corresponding to that namespace to the symbol table. NAMESPACE is 2554 the name of the enclosing namespace. */ 2555 2556 static void 2557 add_partial_namespace (struct partial_die_info *pdi, 2558 CORE_ADDR *lowpc, CORE_ADDR *highpc, 2559 int need_pc, struct dwarf2_cu *cu) 2560 { 2561 /* Add a symbol for the namespace. */ 2562 2563 add_partial_symbol (pdi, cu); 2564 2565 /* Now scan partial symbols in that namespace. */ 2566 2567 if (pdi->has_children) 2568 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu); 2569 } 2570 2571 /* Read a partial die corresponding to a Fortran module. */ 2572 2573 static void 2574 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, 2575 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu) 2576 { 2577 /* Now scan partial symbols in that module. */ 2578 2579 if (pdi->has_children) 2580 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu); 2581 } 2582 2583 /* Read a partial die corresponding to a subprogram and create a partial 2584 symbol for that subprogram. When the CU language allows it, this 2585 routine also defines a partial symbol for each nested subprogram 2586 that this subprogram contains. 2587 2588 DIE my also be a lexical block, in which case we simply search 2589 recursively for suprograms defined inside that lexical block. 2590 Again, this is only performed when the CU language allows this 2591 type of definitions. */ 2592 2593 static void 2594 add_partial_subprogram (struct partial_die_info *pdi, 2595 CORE_ADDR *lowpc, CORE_ADDR *highpc, 2596 int need_pc, struct dwarf2_cu *cu) 2597 { 2598 if (pdi->tag == DW_TAG_subprogram) 2599 { 2600 if (pdi->has_pc_info) 2601 { 2602 if (pdi->lowpc < *lowpc) 2603 *lowpc = pdi->lowpc; 2604 if (pdi->highpc > *highpc) 2605 *highpc = pdi->highpc; 2606 if (need_pc) 2607 { 2608 CORE_ADDR baseaddr; 2609 struct objfile *objfile = cu->objfile; 2610 2611 baseaddr = ANOFFSET (objfile->section_offsets, 2612 SECT_OFF_TEXT (objfile)); 2613 addrmap_set_empty (objfile->psymtabs_addrmap, 2614 pdi->lowpc + baseaddr, 2615 pdi->highpc - 1 + baseaddr, 2616 cu->per_cu->psymtab); 2617 } 2618 if (!pdi->is_declaration) 2619 /* Ignore subprogram DIEs that do not have a name, they are 2620 illegal. Do not emit a complaint at this point, we will 2621 do so when we convert this psymtab into a symtab. */ 2622 if (pdi->name) 2623 add_partial_symbol (pdi, cu); 2624 } 2625 } 2626 2627 if (! pdi->has_children) 2628 return; 2629 2630 if (cu->language == language_ada) 2631 { 2632 pdi = pdi->die_child; 2633 while (pdi != NULL) 2634 { 2635 fixup_partial_die (pdi, cu); 2636 if (pdi->tag == DW_TAG_subprogram 2637 || pdi->tag == DW_TAG_lexical_block) 2638 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu); 2639 pdi = pdi->die_sibling; 2640 } 2641 } 2642 } 2643 2644 /* See if we can figure out if the class lives in a namespace. We do 2645 this by looking for a member function; its demangled name will 2646 contain namespace info, if there is any. */ 2647 2648 static void 2649 guess_structure_name (struct partial_die_info *struct_pdi, 2650 struct dwarf2_cu *cu) 2651 { 2652 if ((cu->language == language_cplus 2653 || cu->language == language_java) 2654 && cu->has_namespace_info == 0 2655 && struct_pdi->has_children) 2656 { 2657 /* NOTE: carlton/2003-10-07: Getting the info this way changes 2658 what template types look like, because the demangler 2659 frequently doesn't give the same name as the debug info. We 2660 could fix this by only using the demangled name to get the 2661 prefix (but see comment in read_structure_type). */ 2662 2663 struct partial_die_info *real_pdi; 2664 2665 /* If this DIE (this DIE's specification, if any) has a parent, then 2666 we should not do this. We'll prepend the parent's fully qualified 2667 name when we create the partial symbol. */ 2668 2669 real_pdi = struct_pdi; 2670 while (real_pdi->has_specification) 2671 real_pdi = find_partial_die (real_pdi->spec_offset, cu); 2672 2673 if (real_pdi->die_parent != NULL) 2674 return; 2675 } 2676 } 2677 2678 /* Read a partial die corresponding to an enumeration type. */ 2679 2680 static void 2681 add_partial_enumeration (struct partial_die_info *enum_pdi, 2682 struct dwarf2_cu *cu) 2683 { 2684 struct partial_die_info *pdi; 2685 2686 if (enum_pdi->name != NULL) 2687 add_partial_symbol (enum_pdi, cu); 2688 2689 pdi = enum_pdi->die_child; 2690 while (pdi) 2691 { 2692 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL) 2693 complaint (&symfile_complaints, _("malformed enumerator DIE ignored")); 2694 else 2695 add_partial_symbol (pdi, cu); 2696 pdi = pdi->die_sibling; 2697 } 2698 } 2699 2700 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU. 2701 Return the corresponding abbrev, or NULL if the number is zero (indicating 2702 an empty DIE). In either case *BYTES_READ will be set to the length of 2703 the initial number. */ 2704 2705 static struct abbrev_info * 2706 peek_die_abbrev (gdb_byte *info_ptr, unsigned int *bytes_read, 2707 struct dwarf2_cu *cu) 2708 { 2709 bfd *abfd = cu->objfile->obfd; 2710 unsigned int abbrev_number; 2711 struct abbrev_info *abbrev; 2712 2713 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read); 2714 2715 if (abbrev_number == 0) 2716 return NULL; 2717 2718 abbrev = dwarf2_lookup_abbrev (abbrev_number, cu); 2719 if (!abbrev) 2720 { 2721 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"), abbrev_number, 2722 bfd_get_filename (abfd)); 2723 } 2724 2725 return abbrev; 2726 } 2727 2728 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. 2729 Returns a pointer to the end of a series of DIEs, terminated by an empty 2730 DIE. Any children of the skipped DIEs will also be skipped. */ 2731 2732 static gdb_byte * 2733 skip_children (gdb_byte *buffer, gdb_byte *info_ptr, struct dwarf2_cu *cu) 2734 { 2735 struct abbrev_info *abbrev; 2736 unsigned int bytes_read; 2737 2738 while (1) 2739 { 2740 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu); 2741 if (abbrev == NULL) 2742 return info_ptr + bytes_read; 2743 else 2744 info_ptr = skip_one_die (buffer, info_ptr + bytes_read, abbrev, cu); 2745 } 2746 } 2747 2748 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. 2749 INFO_PTR should point just after the initial uleb128 of a DIE, and the 2750 abbrev corresponding to that skipped uleb128 should be passed in 2751 ABBREV. Returns a pointer to this DIE's sibling, skipping any 2752 children. */ 2753 2754 static gdb_byte * 2755 skip_one_die (gdb_byte *buffer, gdb_byte *info_ptr, 2756 struct abbrev_info *abbrev, struct dwarf2_cu *cu) 2757 { 2758 unsigned int bytes_read; 2759 struct attribute attr; 2760 bfd *abfd = cu->objfile->obfd; 2761 unsigned int form, i; 2762 2763 for (i = 0; i < abbrev->num_attrs; i++) 2764 { 2765 /* The only abbrev we care about is DW_AT_sibling. */ 2766 if (abbrev->attrs[i].name == DW_AT_sibling) 2767 { 2768 read_attribute (&attr, &abbrev->attrs[i], 2769 abfd, info_ptr, cu); 2770 if (attr.form == DW_FORM_ref_addr) 2771 complaint (&symfile_complaints, _("ignoring absolute DW_AT_sibling")); 2772 else 2773 return buffer + dwarf2_get_ref_die_offset (&attr); 2774 } 2775 2776 /* If it isn't DW_AT_sibling, skip this attribute. */ 2777 form = abbrev->attrs[i].form; 2778 skip_attribute: 2779 switch (form) 2780 { 2781 case DW_FORM_ref_addr: 2782 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3 2783 and later it is offset sized. */ 2784 if (cu->header.version == 2) 2785 info_ptr += cu->header.addr_size; 2786 else 2787 info_ptr += cu->header.offset_size; 2788 break; 2789 case DW_FORM_addr: 2790 info_ptr += cu->header.addr_size; 2791 break; 2792 case DW_FORM_data1: 2793 case DW_FORM_ref1: 2794 case DW_FORM_flag: 2795 info_ptr += 1; 2796 break; 2797 case DW_FORM_flag_present: 2798 break; 2799 case DW_FORM_data2: 2800 case DW_FORM_ref2: 2801 info_ptr += 2; 2802 break; 2803 case DW_FORM_data4: 2804 case DW_FORM_ref4: 2805 info_ptr += 4; 2806 break; 2807 case DW_FORM_data8: 2808 case DW_FORM_ref8: 2809 case DW_FORM_sig8: 2810 info_ptr += 8; 2811 break; 2812 case DW_FORM_string: 2813 read_string (abfd, info_ptr, &bytes_read); 2814 info_ptr += bytes_read; 2815 break; 2816 case DW_FORM_sec_offset: 2817 case DW_FORM_strp: 2818 info_ptr += cu->header.offset_size; 2819 break; 2820 case DW_FORM_exprloc: 2821 case DW_FORM_block: 2822 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 2823 info_ptr += bytes_read; 2824 break; 2825 case DW_FORM_block1: 2826 info_ptr += 1 + read_1_byte (abfd, info_ptr); 2827 break; 2828 case DW_FORM_block2: 2829 info_ptr += 2 + read_2_bytes (abfd, info_ptr); 2830 break; 2831 case DW_FORM_block4: 2832 info_ptr += 4 + read_4_bytes (abfd, info_ptr); 2833 break; 2834 case DW_FORM_sdata: 2835 case DW_FORM_udata: 2836 case DW_FORM_ref_udata: 2837 info_ptr = skip_leb128 (abfd, info_ptr); 2838 break; 2839 case DW_FORM_indirect: 2840 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 2841 info_ptr += bytes_read; 2842 /* We need to continue parsing from here, so just go back to 2843 the top. */ 2844 goto skip_attribute; 2845 2846 default: 2847 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"), 2848 dwarf_form_name (form), 2849 bfd_get_filename (abfd)); 2850 } 2851 } 2852 2853 if (abbrev->has_children) 2854 return skip_children (buffer, info_ptr, cu); 2855 else 2856 return info_ptr; 2857 } 2858 2859 /* Locate ORIG_PDI's sibling. 2860 INFO_PTR should point to the start of the next DIE after ORIG_PDI 2861 in BUFFER. */ 2862 2863 static gdb_byte * 2864 locate_pdi_sibling (struct partial_die_info *orig_pdi, 2865 gdb_byte *buffer, gdb_byte *info_ptr, 2866 bfd *abfd, struct dwarf2_cu *cu) 2867 { 2868 /* Do we know the sibling already? */ 2869 2870 if (orig_pdi->sibling) 2871 return orig_pdi->sibling; 2872 2873 /* Are there any children to deal with? */ 2874 2875 if (!orig_pdi->has_children) 2876 return info_ptr; 2877 2878 /* Skip the children the long way. */ 2879 2880 return skip_children (buffer, info_ptr, cu); 2881 } 2882 2883 /* Expand this partial symbol table into a full symbol table. */ 2884 2885 static void 2886 dwarf2_psymtab_to_symtab (struct partial_symtab *pst) 2887 { 2888 /* FIXME: This is barely more than a stub. */ 2889 if (pst != NULL) 2890 { 2891 if (pst->readin) 2892 { 2893 warning (_("bug: psymtab for %s is already read in."), pst->filename); 2894 } 2895 else 2896 { 2897 if (info_verbose) 2898 { 2899 printf_filtered (_("Reading in symbols for %s..."), pst->filename); 2900 gdb_flush (gdb_stdout); 2901 } 2902 2903 /* Restore our global data. */ 2904 dwarf2_per_objfile = objfile_data (pst->objfile, 2905 dwarf2_objfile_data_key); 2906 2907 /* If this psymtab is constructed from a debug-only objfile, the 2908 has_section_at_zero flag will not necessarily be correct. We 2909 can get the correct value for this flag by looking at the data 2910 associated with the (presumably stripped) associated objfile. */ 2911 if (pst->objfile->separate_debug_objfile_backlink) 2912 { 2913 struct dwarf2_per_objfile *dpo_backlink 2914 = objfile_data (pst->objfile->separate_debug_objfile_backlink, 2915 dwarf2_objfile_data_key); 2916 2917 dwarf2_per_objfile->has_section_at_zero 2918 = dpo_backlink->has_section_at_zero; 2919 } 2920 2921 psymtab_to_symtab_1 (pst); 2922 2923 /* Finish up the debug error message. */ 2924 if (info_verbose) 2925 printf_filtered (_("done.\n")); 2926 } 2927 } 2928 } 2929 2930 /* Add PER_CU to the queue. */ 2931 2932 static void 2933 queue_comp_unit (struct dwarf2_per_cu_data *per_cu, struct objfile *objfile) 2934 { 2935 struct dwarf2_queue_item *item; 2936 2937 per_cu->queued = 1; 2938 item = xmalloc (sizeof (*item)); 2939 item->per_cu = per_cu; 2940 item->next = NULL; 2941 2942 if (dwarf2_queue == NULL) 2943 dwarf2_queue = item; 2944 else 2945 dwarf2_queue_tail->next = item; 2946 2947 dwarf2_queue_tail = item; 2948 } 2949 2950 /* Process the queue. */ 2951 2952 static void 2953 process_queue (struct objfile *objfile) 2954 { 2955 struct dwarf2_queue_item *item, *next_item; 2956 2957 /* The queue starts out with one item, but following a DIE reference 2958 may load a new CU, adding it to the end of the queue. */ 2959 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item) 2960 { 2961 if (item->per_cu->psymtab && !item->per_cu->psymtab->readin) 2962 process_full_comp_unit (item->per_cu); 2963 2964 item->per_cu->queued = 0; 2965 next_item = item->next; 2966 xfree (item); 2967 } 2968 2969 dwarf2_queue_tail = NULL; 2970 } 2971 2972 /* Free all allocated queue entries. This function only releases anything if 2973 an error was thrown; if the queue was processed then it would have been 2974 freed as we went along. */ 2975 2976 static void 2977 dwarf2_release_queue (void *dummy) 2978 { 2979 struct dwarf2_queue_item *item, *last; 2980 2981 item = dwarf2_queue; 2982 while (item) 2983 { 2984 /* Anything still marked queued is likely to be in an 2985 inconsistent state, so discard it. */ 2986 if (item->per_cu->queued) 2987 { 2988 if (item->per_cu->cu != NULL) 2989 free_one_cached_comp_unit (item->per_cu->cu); 2990 item->per_cu->queued = 0; 2991 } 2992 2993 last = item; 2994 item = item->next; 2995 xfree (last); 2996 } 2997 2998 dwarf2_queue = dwarf2_queue_tail = NULL; 2999 } 3000 3001 /* Read in full symbols for PST, and anything it depends on. */ 3002 3003 static void 3004 psymtab_to_symtab_1 (struct partial_symtab *pst) 3005 { 3006 struct dwarf2_per_cu_data *per_cu; 3007 struct cleanup *back_to; 3008 int i; 3009 3010 for (i = 0; i < pst->number_of_dependencies; i++) 3011 if (!pst->dependencies[i]->readin) 3012 { 3013 /* Inform about additional files that need to be read in. */ 3014 if (info_verbose) 3015 { 3016 /* FIXME: i18n: Need to make this a single string. */ 3017 fputs_filtered (" ", gdb_stdout); 3018 wrap_here (""); 3019 fputs_filtered ("and ", gdb_stdout); 3020 wrap_here (""); 3021 printf_filtered ("%s...", pst->dependencies[i]->filename); 3022 wrap_here (""); /* Flush output */ 3023 gdb_flush (gdb_stdout); 3024 } 3025 psymtab_to_symtab_1 (pst->dependencies[i]); 3026 } 3027 3028 per_cu = pst->read_symtab_private; 3029 3030 if (per_cu == NULL) 3031 { 3032 /* It's an include file, no symbols to read for it. 3033 Everything is in the parent symtab. */ 3034 pst->readin = 1; 3035 return; 3036 } 3037 3038 back_to = make_cleanup (dwarf2_release_queue, NULL); 3039 3040 queue_comp_unit (per_cu, pst->objfile); 3041 3042 if (per_cu->from_debug_types) 3043 read_signatured_type_at_offset (pst->objfile, per_cu->offset); 3044 else 3045 load_full_comp_unit (per_cu, pst->objfile); 3046 3047 process_queue (pst->objfile); 3048 3049 /* Age the cache, releasing compilation units that have not 3050 been used recently. */ 3051 age_cached_comp_units (); 3052 3053 do_cleanups (back_to); 3054 } 3055 3056 /* Load the DIEs associated with PER_CU into memory. */ 3057 3058 static void 3059 load_full_comp_unit (struct dwarf2_per_cu_data *per_cu, struct objfile *objfile) 3060 { 3061 bfd *abfd = objfile->obfd; 3062 struct dwarf2_cu *cu; 3063 unsigned int offset; 3064 gdb_byte *info_ptr, *beg_of_comp_unit; 3065 struct cleanup *back_to, *free_cu_cleanup; 3066 struct attribute *attr; 3067 3068 gdb_assert (! per_cu->from_debug_types); 3069 3070 /* Set local variables from the partial symbol table info. */ 3071 offset = per_cu->offset; 3072 3073 dwarf2_read_section (objfile, &dwarf2_per_objfile->info); 3074 info_ptr = dwarf2_per_objfile->info.buffer + offset; 3075 beg_of_comp_unit = info_ptr; 3076 3077 cu = alloc_one_comp_unit (objfile); 3078 3079 /* If an error occurs while loading, release our storage. */ 3080 free_cu_cleanup = make_cleanup (free_one_comp_unit, cu); 3081 3082 /* Read in the comp_unit header. */ 3083 info_ptr = read_comp_unit_head (&cu->header, info_ptr, abfd); 3084 3085 /* Complete the cu_header. */ 3086 cu->header.offset = offset; 3087 cu->header.first_die_offset = info_ptr - beg_of_comp_unit; 3088 3089 /* Read the abbrevs for this compilation unit. */ 3090 dwarf2_read_abbrevs (abfd, cu); 3091 back_to = make_cleanup (dwarf2_free_abbrev_table, cu); 3092 3093 /* Link this compilation unit into the compilation unit tree. */ 3094 per_cu->cu = cu; 3095 cu->per_cu = per_cu; 3096 cu->type_hash = per_cu->type_hash; 3097 3098 cu->dies = read_comp_unit (info_ptr, cu); 3099 3100 /* We try not to read any attributes in this function, because not 3101 all objfiles needed for references have been loaded yet, and symbol 3102 table processing isn't initialized. But we have to set the CU language, 3103 or we won't be able to build types correctly. */ 3104 attr = dwarf2_attr (cu->dies, DW_AT_language, cu); 3105 if (attr) 3106 set_cu_language (DW_UNSND (attr), cu); 3107 else 3108 set_cu_language (language_minimal, cu); 3109 3110 /* Similarly, if we do not read the producer, we can not apply 3111 producer-specific interpretation. */ 3112 attr = dwarf2_attr (cu->dies, DW_AT_producer, cu); 3113 if (attr) 3114 cu->producer = DW_STRING (attr); 3115 3116 /* Link this CU into read_in_chain. */ 3117 per_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain; 3118 dwarf2_per_objfile->read_in_chain = per_cu; 3119 3120 do_cleanups (back_to); 3121 3122 /* We've successfully allocated this compilation unit. Let our caller 3123 clean it up when finished with it. */ 3124 discard_cleanups (free_cu_cleanup); 3125 } 3126 3127 /* Generate full symbol information for PST and CU, whose DIEs have 3128 already been loaded into memory. */ 3129 3130 static void 3131 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu) 3132 { 3133 struct partial_symtab *pst = per_cu->psymtab; 3134 struct dwarf2_cu *cu = per_cu->cu; 3135 struct objfile *objfile = pst->objfile; 3136 CORE_ADDR lowpc, highpc; 3137 struct symtab *symtab; 3138 struct cleanup *back_to; 3139 CORE_ADDR baseaddr; 3140 3141 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 3142 3143 buildsym_init (); 3144 back_to = make_cleanup (really_free_pendings, NULL); 3145 3146 cu->list_in_scope = &file_symbols; 3147 3148 dwarf2_find_base_address (cu->dies, cu); 3149 3150 /* Do line number decoding in read_file_scope () */ 3151 process_die (cu->dies, cu); 3152 3153 /* Some compilers don't define a DW_AT_high_pc attribute for the 3154 compilation unit. If the DW_AT_high_pc is missing, synthesize 3155 it, by scanning the DIE's below the compilation unit. */ 3156 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu); 3157 3158 symtab = end_symtab (highpc + baseaddr, objfile, SECT_OFF_TEXT (objfile)); 3159 3160 /* Set symtab language to language from DW_AT_language. 3161 If the compilation is from a C file generated by language preprocessors, 3162 do not set the language if it was already deduced by start_subfile. */ 3163 if (symtab != NULL 3164 && !(cu->language == language_c && symtab->language != language_c)) 3165 { 3166 symtab->language = cu->language; 3167 } 3168 pst->symtab = symtab; 3169 pst->readin = 1; 3170 3171 do_cleanups (back_to); 3172 } 3173 3174 /* Process a die and its children. */ 3175 3176 static void 3177 process_die (struct die_info *die, struct dwarf2_cu *cu) 3178 { 3179 switch (die->tag) 3180 { 3181 case DW_TAG_padding: 3182 break; 3183 case DW_TAG_compile_unit: 3184 read_file_scope (die, cu); 3185 break; 3186 case DW_TAG_type_unit: 3187 read_type_unit_scope (die, cu); 3188 break; 3189 case DW_TAG_subprogram: 3190 case DW_TAG_inlined_subroutine: 3191 read_func_scope (die, cu); 3192 break; 3193 case DW_TAG_lexical_block: 3194 case DW_TAG_try_block: 3195 case DW_TAG_catch_block: 3196 read_lexical_block_scope (die, cu); 3197 break; 3198 case DW_TAG_class_type: 3199 case DW_TAG_interface_type: 3200 case DW_TAG_structure_type: 3201 case DW_TAG_union_type: 3202 process_structure_scope (die, cu); 3203 break; 3204 case DW_TAG_enumeration_type: 3205 process_enumeration_scope (die, cu); 3206 break; 3207 3208 /* These dies have a type, but processing them does not create 3209 a symbol or recurse to process the children. Therefore we can 3210 read them on-demand through read_type_die. */ 3211 case DW_TAG_subroutine_type: 3212 case DW_TAG_set_type: 3213 case DW_TAG_array_type: 3214 case DW_TAG_pointer_type: 3215 case DW_TAG_ptr_to_member_type: 3216 case DW_TAG_reference_type: 3217 case DW_TAG_string_type: 3218 break; 3219 3220 case DW_TAG_base_type: 3221 case DW_TAG_subrange_type: 3222 case DW_TAG_typedef: 3223 /* Add a typedef symbol for the type definition, if it has a 3224 DW_AT_name. */ 3225 new_symbol (die, read_type_die (die, cu), cu); 3226 break; 3227 case DW_TAG_common_block: 3228 read_common_block (die, cu); 3229 break; 3230 case DW_TAG_common_inclusion: 3231 break; 3232 case DW_TAG_namespace: 3233 processing_has_namespace_info = 1; 3234 read_namespace (die, cu); 3235 break; 3236 case DW_TAG_module: 3237 processing_has_namespace_info = 1; 3238 read_module (die, cu); 3239 break; 3240 case DW_TAG_imported_declaration: 3241 case DW_TAG_imported_module: 3242 processing_has_namespace_info = 1; 3243 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration 3244 || cu->language != language_fortran)) 3245 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"), 3246 dwarf_tag_name (die->tag)); 3247 read_import_statement (die, cu); 3248 break; 3249 default: 3250 new_symbol (die, NULL, cu); 3251 break; 3252 } 3253 } 3254 3255 /* A helper function for dwarf2_compute_name which determines whether DIE 3256 needs to have the name of the scope prepended to the name listed in the 3257 die. */ 3258 3259 static int 3260 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu) 3261 { 3262 struct attribute *attr; 3263 3264 switch (die->tag) 3265 { 3266 case DW_TAG_namespace: 3267 case DW_TAG_typedef: 3268 case DW_TAG_class_type: 3269 case DW_TAG_interface_type: 3270 case DW_TAG_structure_type: 3271 case DW_TAG_union_type: 3272 case DW_TAG_enumeration_type: 3273 case DW_TAG_enumerator: 3274 case DW_TAG_subprogram: 3275 case DW_TAG_member: 3276 return 1; 3277 3278 case DW_TAG_variable: 3279 /* We only need to prefix "globally" visible variables. These include 3280 any variable marked with DW_AT_external or any variable that 3281 lives in a namespace. [Variables in anonymous namespaces 3282 require prefixing, but they are not DW_AT_external.] */ 3283 3284 if (dwarf2_attr (die, DW_AT_specification, cu)) 3285 { 3286 struct dwarf2_cu *spec_cu = cu; 3287 3288 return die_needs_namespace (die_specification (die, &spec_cu), 3289 spec_cu); 3290 } 3291 3292 attr = dwarf2_attr (die, DW_AT_external, cu); 3293 if (attr == NULL && die->parent->tag != DW_TAG_namespace 3294 && die->parent->tag != DW_TAG_module) 3295 return 0; 3296 /* A variable in a lexical block of some kind does not need a 3297 namespace, even though in C++ such variables may be external 3298 and have a mangled name. */ 3299 if (die->parent->tag == DW_TAG_lexical_block 3300 || die->parent->tag == DW_TAG_try_block 3301 || die->parent->tag == DW_TAG_catch_block 3302 || die->parent->tag == DW_TAG_subprogram) 3303 return 0; 3304 return 1; 3305 3306 default: 3307 return 0; 3308 } 3309 } 3310 3311 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero, 3312 compute the physname for the object, which include a method's 3313 formal parameters (C++/Java) and return type (Java). 3314 3315 For Ada, return the DIE's linkage name rather than the fully qualified 3316 name. PHYSNAME is ignored.. 3317 3318 The result is allocated on the objfile_obstack and canonicalized. */ 3319 3320 static const char * 3321 dwarf2_compute_name (char *name, struct die_info *die, struct dwarf2_cu *cu, 3322 int physname) 3323 { 3324 if (name == NULL) 3325 name = dwarf2_name (die, cu); 3326 3327 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise 3328 compute it by typename_concat inside GDB. */ 3329 if (cu->language == language_ada 3330 || (cu->language == language_fortran && physname)) 3331 { 3332 /* For Ada unit, we prefer the linkage name over the name, as 3333 the former contains the exported name, which the user expects 3334 to be able to reference. Ideally, we want the user to be able 3335 to reference this entity using either natural or linkage name, 3336 but we haven't started looking at this enhancement yet. */ 3337 struct attribute *attr; 3338 3339 attr = dwarf2_attr (die, DW_AT_linkage_name, cu); 3340 if (attr == NULL) 3341 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); 3342 if (attr && DW_STRING (attr)) 3343 return DW_STRING (attr); 3344 } 3345 3346 /* These are the only languages we know how to qualify names in. */ 3347 if (name != NULL 3348 && (cu->language == language_cplus || cu->language == language_java 3349 || cu->language == language_fortran)) 3350 { 3351 if (die_needs_namespace (die, cu)) 3352 { 3353 long length; 3354 char *prefix; 3355 struct ui_file *buf; 3356 3357 prefix = determine_prefix (die, cu); 3358 buf = mem_fileopen (); 3359 if (*prefix != '\0') 3360 { 3361 char *prefixed_name = typename_concat (NULL, prefix, name, 3362 physname, cu); 3363 3364 fputs_unfiltered (prefixed_name, buf); 3365 xfree (prefixed_name); 3366 } 3367 else 3368 fputs_unfiltered (name ? name : "", buf); 3369 3370 /* For Java and C++ methods, append formal parameter type 3371 information, if PHYSNAME. */ 3372 3373 if (physname && die->tag == DW_TAG_subprogram 3374 && (cu->language == language_cplus 3375 || cu->language == language_java)) 3376 { 3377 struct type *type = read_type_die (die, cu); 3378 3379 c_type_print_args (type, buf, 0, cu->language); 3380 3381 if (cu->language == language_java) 3382 { 3383 /* For java, we must append the return type to method 3384 names. */ 3385 if (die->tag == DW_TAG_subprogram) 3386 java_print_type (TYPE_TARGET_TYPE (type), "", buf, 3387 0, 0); 3388 } 3389 else if (cu->language == language_cplus) 3390 { 3391 if (TYPE_NFIELDS (type) > 0 3392 && TYPE_FIELD_ARTIFICIAL (type, 0) 3393 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)))) 3394 fputs_unfiltered (" const", buf); 3395 } 3396 } 3397 3398 name = ui_file_obsavestring (buf, &cu->objfile->objfile_obstack, 3399 &length); 3400 ui_file_delete (buf); 3401 3402 if (cu->language == language_cplus) 3403 { 3404 char *cname 3405 = dwarf2_canonicalize_name (name, cu, 3406 &cu->objfile->objfile_obstack); 3407 3408 if (cname != NULL) 3409 name = cname; 3410 } 3411 } 3412 } 3413 3414 return name; 3415 } 3416 3417 /* Return the fully qualified name of DIE, based on its DW_AT_name. 3418 If scope qualifiers are appropriate they will be added. The result 3419 will be allocated on the objfile_obstack, or NULL if the DIE does 3420 not have a name. NAME may either be from a previous call to 3421 dwarf2_name or NULL. 3422 3423 The output string will be canonicalized (if C++/Java). */ 3424 3425 static const char * 3426 dwarf2_full_name (char *name, struct die_info *die, struct dwarf2_cu *cu) 3427 { 3428 return dwarf2_compute_name (name, die, cu, 0); 3429 } 3430 3431 /* Construct a physname for the given DIE in CU. NAME may either be 3432 from a previous call to dwarf2_name or NULL. The result will be 3433 allocated on the objfile_objstack or NULL if the DIE does not have a 3434 name. 3435 3436 The output string will be canonicalized (if C++/Java). */ 3437 3438 static const char * 3439 dwarf2_physname (char *name, struct die_info *die, struct dwarf2_cu *cu) 3440 { 3441 return dwarf2_compute_name (name, die, cu, 1); 3442 } 3443 3444 /* Read the import statement specified by the given die and record it. */ 3445 3446 static void 3447 read_import_statement (struct die_info *die, struct dwarf2_cu *cu) 3448 { 3449 struct attribute *import_attr; 3450 struct die_info *imported_die; 3451 struct dwarf2_cu *imported_cu; 3452 const char *imported_name; 3453 const char *imported_name_prefix; 3454 const char *canonical_name; 3455 const char *import_alias; 3456 const char *imported_declaration = NULL; 3457 const char *import_prefix; 3458 3459 char *temp; 3460 3461 import_attr = dwarf2_attr (die, DW_AT_import, cu); 3462 if (import_attr == NULL) 3463 { 3464 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"), 3465 dwarf_tag_name (die->tag)); 3466 return; 3467 } 3468 3469 imported_cu = cu; 3470 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu); 3471 imported_name = dwarf2_name (imported_die, imported_cu); 3472 if (imported_name == NULL) 3473 { 3474 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524 3475 3476 The import in the following code: 3477 namespace A 3478 { 3479 typedef int B; 3480 } 3481 3482 int main () 3483 { 3484 using A::B; 3485 B b; 3486 return b; 3487 } 3488 3489 ... 3490 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration) 3491 <52> DW_AT_decl_file : 1 3492 <53> DW_AT_decl_line : 6 3493 <54> DW_AT_import : <0x75> 3494 <2><58>: Abbrev Number: 4 (DW_TAG_typedef) 3495 <59> DW_AT_name : B 3496 <5b> DW_AT_decl_file : 1 3497 <5c> DW_AT_decl_line : 2 3498 <5d> DW_AT_type : <0x6e> 3499 ... 3500 <1><75>: Abbrev Number: 7 (DW_TAG_base_type) 3501 <76> DW_AT_byte_size : 4 3502 <77> DW_AT_encoding : 5 (signed) 3503 3504 imports the wrong die ( 0x75 instead of 0x58 ). 3505 This case will be ignored until the gcc bug is fixed. */ 3506 return; 3507 } 3508 3509 /* Figure out the local name after import. */ 3510 import_alias = dwarf2_name (die, cu); 3511 3512 /* Figure out where the statement is being imported to. */ 3513 import_prefix = determine_prefix (die, cu); 3514 3515 /* Figure out what the scope of the imported die is and prepend it 3516 to the name of the imported die. */ 3517 imported_name_prefix = determine_prefix (imported_die, imported_cu); 3518 3519 if (imported_die->tag != DW_TAG_namespace 3520 && imported_die->tag != DW_TAG_module) 3521 { 3522 imported_declaration = imported_name; 3523 canonical_name = imported_name_prefix; 3524 } 3525 else if (strlen (imported_name_prefix) > 0) 3526 { 3527 temp = alloca (strlen (imported_name_prefix) 3528 + 2 + strlen (imported_name) + 1); 3529 strcpy (temp, imported_name_prefix); 3530 strcat (temp, "::"); 3531 strcat (temp, imported_name); 3532 canonical_name = temp; 3533 } 3534 else 3535 canonical_name = imported_name; 3536 3537 cp_add_using_directive (import_prefix, 3538 canonical_name, 3539 import_alias, 3540 imported_declaration, 3541 &cu->objfile->objfile_obstack); 3542 } 3543 3544 static void 3545 initialize_cu_func_list (struct dwarf2_cu *cu) 3546 { 3547 cu->first_fn = cu->last_fn = cu->cached_fn = NULL; 3548 } 3549 3550 static void 3551 free_cu_line_header (void *arg) 3552 { 3553 struct dwarf2_cu *cu = arg; 3554 3555 free_line_header (cu->line_header); 3556 cu->line_header = NULL; 3557 } 3558 3559 static void 3560 read_file_scope (struct die_info *die, struct dwarf2_cu *cu) 3561 { 3562 struct objfile *objfile = cu->objfile; 3563 struct cleanup *back_to = make_cleanup (null_cleanup, 0); 3564 CORE_ADDR lowpc = ((CORE_ADDR) -1); 3565 CORE_ADDR highpc = ((CORE_ADDR) 0); 3566 struct attribute *attr; 3567 char *name = NULL; 3568 char *comp_dir = NULL; 3569 struct die_info *child_die; 3570 bfd *abfd = objfile->obfd; 3571 struct line_header *line_header = 0; 3572 CORE_ADDR baseaddr; 3573 3574 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 3575 3576 get_scope_pc_bounds (die, &lowpc, &highpc, cu); 3577 3578 /* If we didn't find a lowpc, set it to highpc to avoid complaints 3579 from finish_block. */ 3580 if (lowpc == ((CORE_ADDR) -1)) 3581 lowpc = highpc; 3582 lowpc += baseaddr; 3583 highpc += baseaddr; 3584 3585 /* Find the filename. Do not use dwarf2_name here, since the filename 3586 is not a source language identifier. */ 3587 attr = dwarf2_attr (die, DW_AT_name, cu); 3588 if (attr) 3589 { 3590 name = DW_STRING (attr); 3591 } 3592 3593 attr = dwarf2_attr (die, DW_AT_comp_dir, cu); 3594 if (attr) 3595 comp_dir = DW_STRING (attr); 3596 else if (name != NULL && IS_ABSOLUTE_PATH (name)) 3597 { 3598 comp_dir = ldirname (name); 3599 if (comp_dir != NULL) 3600 make_cleanup (xfree, comp_dir); 3601 } 3602 if (comp_dir != NULL) 3603 { 3604 /* Irix 6.2 native cc prepends <machine>.: to the compilation 3605 directory, get rid of it. */ 3606 char *cp = strchr (comp_dir, ':'); 3607 3608 if (cp && cp != comp_dir && cp[-1] == '.' && cp[1] == '/') 3609 comp_dir = cp + 1; 3610 } 3611 3612 if (name == NULL) 3613 name = "<unknown>"; 3614 3615 attr = dwarf2_attr (die, DW_AT_language, cu); 3616 if (attr) 3617 { 3618 set_cu_language (DW_UNSND (attr), cu); 3619 } 3620 3621 attr = dwarf2_attr (die, DW_AT_producer, cu); 3622 if (attr) 3623 cu->producer = DW_STRING (attr); 3624 3625 /* We assume that we're processing GCC output. */ 3626 processing_gcc_compilation = 2; 3627 3628 processing_has_namespace_info = 0; 3629 3630 start_symtab (name, comp_dir, lowpc); 3631 record_debugformat ("DWARF 2"); 3632 record_producer (cu->producer); 3633 3634 initialize_cu_func_list (cu); 3635 3636 /* Decode line number information if present. We do this before 3637 processing child DIEs, so that the line header table is available 3638 for DW_AT_decl_file. */ 3639 attr = dwarf2_attr (die, DW_AT_stmt_list, cu); 3640 if (attr) 3641 { 3642 unsigned int line_offset = DW_UNSND (attr); 3643 line_header = dwarf_decode_line_header (line_offset, abfd, cu); 3644 if (line_header) 3645 { 3646 cu->line_header = line_header; 3647 make_cleanup (free_cu_line_header, cu); 3648 dwarf_decode_lines (line_header, comp_dir, abfd, cu, NULL); 3649 } 3650 } 3651 3652 /* Process all dies in compilation unit. */ 3653 if (die->child != NULL) 3654 { 3655 child_die = die->child; 3656 while (child_die && child_die->tag) 3657 { 3658 process_die (child_die, cu); 3659 child_die = sibling_die (child_die); 3660 } 3661 } 3662 3663 /* Decode macro information, if present. Dwarf 2 macro information 3664 refers to information in the line number info statement program 3665 header, so we can only read it if we've read the header 3666 successfully. */ 3667 attr = dwarf2_attr (die, DW_AT_macro_info, cu); 3668 if (attr && line_header) 3669 { 3670 unsigned int macro_offset = DW_UNSND (attr); 3671 3672 dwarf_decode_macros (line_header, macro_offset, 3673 comp_dir, abfd, cu); 3674 } 3675 do_cleanups (back_to); 3676 } 3677 3678 /* For TUs we want to skip the first top level sibling if it's not the 3679 actual type being defined by this TU. In this case the first top 3680 level sibling is there to provide context only. */ 3681 3682 static void 3683 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu) 3684 { 3685 struct objfile *objfile = cu->objfile; 3686 struct cleanup *back_to = make_cleanup (null_cleanup, 0); 3687 CORE_ADDR lowpc; 3688 struct attribute *attr; 3689 char *name = NULL; 3690 char *comp_dir = NULL; 3691 struct die_info *child_die; 3692 bfd *abfd = objfile->obfd; 3693 3694 /* start_symtab needs a low pc, but we don't really have one. 3695 Do what read_file_scope would do in the absence of such info. */ 3696 lowpc = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 3697 3698 /* Find the filename. Do not use dwarf2_name here, since the filename 3699 is not a source language identifier. */ 3700 attr = dwarf2_attr (die, DW_AT_name, cu); 3701 if (attr) 3702 name = DW_STRING (attr); 3703 3704 attr = dwarf2_attr (die, DW_AT_comp_dir, cu); 3705 if (attr) 3706 comp_dir = DW_STRING (attr); 3707 else if (name != NULL && IS_ABSOLUTE_PATH (name)) 3708 { 3709 comp_dir = ldirname (name); 3710 if (comp_dir != NULL) 3711 make_cleanup (xfree, comp_dir); 3712 } 3713 3714 if (name == NULL) 3715 name = "<unknown>"; 3716 3717 attr = dwarf2_attr (die, DW_AT_language, cu); 3718 if (attr) 3719 set_cu_language (DW_UNSND (attr), cu); 3720 3721 /* This isn't technically needed today. It is done for symmetry 3722 with read_file_scope. */ 3723 attr = dwarf2_attr (die, DW_AT_producer, cu); 3724 if (attr) 3725 cu->producer = DW_STRING (attr); 3726 3727 /* We assume that we're processing GCC output. */ 3728 processing_gcc_compilation = 2; 3729 3730 processing_has_namespace_info = 0; 3731 3732 start_symtab (name, comp_dir, lowpc); 3733 record_debugformat ("DWARF 2"); 3734 record_producer (cu->producer); 3735 3736 /* Process the dies in the type unit. */ 3737 if (die->child == NULL) 3738 { 3739 dump_die_for_error (die); 3740 error (_("Dwarf Error: Missing children for type unit [in module %s]"), 3741 bfd_get_filename (abfd)); 3742 } 3743 3744 child_die = die->child; 3745 3746 while (child_die && child_die->tag) 3747 { 3748 process_die (child_die, cu); 3749 3750 child_die = sibling_die (child_die); 3751 } 3752 3753 do_cleanups (back_to); 3754 } 3755 3756 static void 3757 add_to_cu_func_list (const char *name, CORE_ADDR lowpc, CORE_ADDR highpc, 3758 struct dwarf2_cu *cu) 3759 { 3760 struct function_range *thisfn; 3761 3762 thisfn = (struct function_range *) 3763 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct function_range)); 3764 thisfn->name = name; 3765 thisfn->lowpc = lowpc; 3766 thisfn->highpc = highpc; 3767 thisfn->seen_line = 0; 3768 thisfn->next = NULL; 3769 3770 if (cu->last_fn == NULL) 3771 cu->first_fn = thisfn; 3772 else 3773 cu->last_fn->next = thisfn; 3774 3775 cu->last_fn = thisfn; 3776 } 3777 3778 /* qsort helper for inherit_abstract_dies. */ 3779 3780 static int 3781 unsigned_int_compar (const void *ap, const void *bp) 3782 { 3783 unsigned int a = *(unsigned int *) ap; 3784 unsigned int b = *(unsigned int *) bp; 3785 3786 return (a > b) - (b > a); 3787 } 3788 3789 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes). 3790 Inherit only the children of the DW_AT_abstract_origin DIE not being already 3791 referenced by DW_AT_abstract_origin from the children of the current DIE. */ 3792 3793 static void 3794 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu) 3795 { 3796 struct die_info *child_die; 3797 unsigned die_children_count; 3798 /* CU offsets which were referenced by children of the current DIE. */ 3799 unsigned *offsets; 3800 unsigned *offsets_end, *offsetp; 3801 /* Parent of DIE - referenced by DW_AT_abstract_origin. */ 3802 struct die_info *origin_die; 3803 /* Iterator of the ORIGIN_DIE children. */ 3804 struct die_info *origin_child_die; 3805 struct cleanup *cleanups; 3806 struct attribute *attr; 3807 3808 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu); 3809 if (!attr) 3810 return; 3811 3812 origin_die = follow_die_ref (die, attr, &cu); 3813 if (die->tag != origin_die->tag 3814 && !(die->tag == DW_TAG_inlined_subroutine 3815 && origin_die->tag == DW_TAG_subprogram)) 3816 complaint (&symfile_complaints, 3817 _("DIE 0x%x and its abstract origin 0x%x have different tags"), 3818 die->offset, origin_die->offset); 3819 3820 child_die = die->child; 3821 die_children_count = 0; 3822 while (child_die && child_die->tag) 3823 { 3824 child_die = sibling_die (child_die); 3825 die_children_count++; 3826 } 3827 offsets = xmalloc (sizeof (*offsets) * die_children_count); 3828 cleanups = make_cleanup (xfree, offsets); 3829 3830 offsets_end = offsets; 3831 child_die = die->child; 3832 while (child_die && child_die->tag) 3833 { 3834 /* For each CHILD_DIE, find the corresponding child of 3835 ORIGIN_DIE. If there is more than one layer of 3836 DW_AT_abstract_origin, follow them all; there shouldn't be, 3837 but GCC versions at least through 4.4 generate this (GCC PR 3838 40573). */ 3839 struct die_info *child_origin_die = child_die; 3840 3841 while (1) 3842 { 3843 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin, cu); 3844 if (attr == NULL) 3845 break; 3846 child_origin_die = follow_die_ref (child_origin_die, attr, &cu); 3847 } 3848 3849 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract 3850 counterpart may exist. */ 3851 if (child_origin_die != child_die) 3852 { 3853 if (child_die->tag != child_origin_die->tag 3854 && !(child_die->tag == DW_TAG_inlined_subroutine 3855 && child_origin_die->tag == DW_TAG_subprogram)) 3856 complaint (&symfile_complaints, 3857 _("Child DIE 0x%x and its abstract origin 0x%x have " 3858 "different tags"), child_die->offset, 3859 child_origin_die->offset); 3860 if (child_origin_die->parent != origin_die) 3861 complaint (&symfile_complaints, 3862 _("Child DIE 0x%x and its abstract origin 0x%x have " 3863 "different parents"), child_die->offset, 3864 child_origin_die->offset); 3865 else 3866 *offsets_end++ = child_origin_die->offset; 3867 } 3868 child_die = sibling_die (child_die); 3869 } 3870 qsort (offsets, offsets_end - offsets, sizeof (*offsets), 3871 unsigned_int_compar); 3872 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++) 3873 if (offsetp[-1] == *offsetp) 3874 complaint (&symfile_complaints, _("Multiple children of DIE 0x%x refer " 3875 "to DIE 0x%x as their abstract origin"), 3876 die->offset, *offsetp); 3877 3878 offsetp = offsets; 3879 origin_child_die = origin_die->child; 3880 while (origin_child_die && origin_child_die->tag) 3881 { 3882 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */ 3883 while (offsetp < offsets_end && *offsetp < origin_child_die->offset) 3884 offsetp++; 3885 if (offsetp >= offsets_end || *offsetp > origin_child_die->offset) 3886 { 3887 /* Found that ORIGIN_CHILD_DIE is really not referenced. */ 3888 process_die (origin_child_die, cu); 3889 } 3890 origin_child_die = sibling_die (origin_child_die); 3891 } 3892 3893 do_cleanups (cleanups); 3894 } 3895 3896 static void 3897 read_func_scope (struct die_info *die, struct dwarf2_cu *cu) 3898 { 3899 struct objfile *objfile = cu->objfile; 3900 struct context_stack *new; 3901 CORE_ADDR lowpc; 3902 CORE_ADDR highpc; 3903 struct die_info *child_die; 3904 struct attribute *attr, *call_line, *call_file; 3905 char *name; 3906 CORE_ADDR baseaddr; 3907 struct block *block; 3908 int inlined_func = (die->tag == DW_TAG_inlined_subroutine); 3909 3910 if (inlined_func) 3911 { 3912 /* If we do not have call site information, we can't show the 3913 caller of this inlined function. That's too confusing, so 3914 only use the scope for local variables. */ 3915 call_line = dwarf2_attr (die, DW_AT_call_line, cu); 3916 call_file = dwarf2_attr (die, DW_AT_call_file, cu); 3917 if (call_line == NULL || call_file == NULL) 3918 { 3919 read_lexical_block_scope (die, cu); 3920 return; 3921 } 3922 } 3923 3924 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 3925 3926 name = dwarf2_name (die, cu); 3927 3928 /* Ignore functions with missing or empty names. These are actually 3929 illegal according to the DWARF standard. */ 3930 if (name == NULL) 3931 { 3932 complaint (&symfile_complaints, 3933 _("missing name for subprogram DIE at %d"), die->offset); 3934 return; 3935 } 3936 3937 /* Ignore functions with missing or invalid low and high pc attributes. */ 3938 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)) 3939 { 3940 attr = dwarf2_attr (die, DW_AT_external, cu); 3941 if (!attr || !DW_UNSND (attr)) 3942 complaint (&symfile_complaints, 3943 _("cannot get low and high bounds for subprogram DIE at %d"), 3944 die->offset); 3945 return; 3946 } 3947 3948 lowpc += baseaddr; 3949 highpc += baseaddr; 3950 3951 /* Record the function range for dwarf_decode_lines. */ 3952 add_to_cu_func_list (name, lowpc, highpc, cu); 3953 3954 new = push_context (0, lowpc); 3955 new->name = new_symbol (die, read_type_die (die, cu), cu); 3956 3957 /* If there is a location expression for DW_AT_frame_base, record 3958 it. */ 3959 attr = dwarf2_attr (die, DW_AT_frame_base, cu); 3960 if (attr) 3961 /* FIXME: cagney/2004-01-26: The DW_AT_frame_base's location 3962 expression is being recorded directly in the function's symbol 3963 and not in a separate frame-base object. I guess this hack is 3964 to avoid adding some sort of frame-base adjunct/annex to the 3965 function's symbol :-(. The problem with doing this is that it 3966 results in a function symbol with a location expression that 3967 has nothing to do with the location of the function, ouch! The 3968 relationship should be: a function's symbol has-a frame base; a 3969 frame-base has-a location expression. */ 3970 dwarf2_symbol_mark_computed (attr, new->name, cu); 3971 3972 cu->list_in_scope = &local_symbols; 3973 3974 if (die->child != NULL) 3975 { 3976 child_die = die->child; 3977 while (child_die && child_die->tag) 3978 { 3979 process_die (child_die, cu); 3980 child_die = sibling_die (child_die); 3981 } 3982 } 3983 3984 inherit_abstract_dies (die, cu); 3985 3986 /* If we have a DW_AT_specification, we might need to import using 3987 directives from the context of the specification DIE. See the 3988 comment in determine_prefix. */ 3989 if (cu->language == language_cplus 3990 && dwarf2_attr (die, DW_AT_specification, cu)) 3991 { 3992 struct dwarf2_cu *spec_cu = cu; 3993 struct die_info *spec_die = die_specification (die, &spec_cu); 3994 3995 while (spec_die) 3996 { 3997 child_die = spec_die->child; 3998 while (child_die && child_die->tag) 3999 { 4000 if (child_die->tag == DW_TAG_imported_module) 4001 process_die (child_die, spec_cu); 4002 child_die = sibling_die (child_die); 4003 } 4004 4005 /* In some cases, GCC generates specification DIEs that 4006 themselves contain DW_AT_specification attributes. */ 4007 spec_die = die_specification (spec_die, &spec_cu); 4008 } 4009 } 4010 4011 new = pop_context (); 4012 /* Make a block for the local symbols within. */ 4013 block = finish_block (new->name, &local_symbols, new->old_blocks, 4014 lowpc, highpc, objfile); 4015 4016 /* For C++, set the block's scope. */ 4017 if (cu->language == language_cplus || cu->language == language_fortran) 4018 cp_set_block_scope (new->name, block, &objfile->objfile_obstack, 4019 determine_prefix (die, cu), 4020 processing_has_namespace_info); 4021 4022 /* If we have address ranges, record them. */ 4023 dwarf2_record_block_ranges (die, block, baseaddr, cu); 4024 4025 /* In C++, we can have functions nested inside functions (e.g., when 4026 a function declares a class that has methods). This means that 4027 when we finish processing a function scope, we may need to go 4028 back to building a containing block's symbol lists. */ 4029 local_symbols = new->locals; 4030 param_symbols = new->params; 4031 using_directives = new->using_directives; 4032 4033 /* If we've finished processing a top-level function, subsequent 4034 symbols go in the file symbol list. */ 4035 if (outermost_context_p ()) 4036 cu->list_in_scope = &file_symbols; 4037 } 4038 4039 /* Process all the DIES contained within a lexical block scope. Start 4040 a new scope, process the dies, and then close the scope. */ 4041 4042 static void 4043 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu) 4044 { 4045 struct objfile *objfile = cu->objfile; 4046 struct context_stack *new; 4047 CORE_ADDR lowpc, highpc; 4048 struct die_info *child_die; 4049 CORE_ADDR baseaddr; 4050 4051 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 4052 4053 /* Ignore blocks with missing or invalid low and high pc attributes. */ 4054 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges 4055 as multiple lexical blocks? Handling children in a sane way would 4056 be nasty. Might be easier to properly extend generic blocks to 4057 describe ranges. */ 4058 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)) 4059 return; 4060 lowpc += baseaddr; 4061 highpc += baseaddr; 4062 4063 push_context (0, lowpc); 4064 if (die->child != NULL) 4065 { 4066 child_die = die->child; 4067 while (child_die && child_die->tag) 4068 { 4069 process_die (child_die, cu); 4070 child_die = sibling_die (child_die); 4071 } 4072 } 4073 new = pop_context (); 4074 4075 if (local_symbols != NULL || using_directives != NULL) 4076 { 4077 struct block *block 4078 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr, 4079 highpc, objfile); 4080 4081 /* Note that recording ranges after traversing children, as we 4082 do here, means that recording a parent's ranges entails 4083 walking across all its children's ranges as they appear in 4084 the address map, which is quadratic behavior. 4085 4086 It would be nicer to record the parent's ranges before 4087 traversing its children, simply overriding whatever you find 4088 there. But since we don't even decide whether to create a 4089 block until after we've traversed its children, that's hard 4090 to do. */ 4091 dwarf2_record_block_ranges (die, block, baseaddr, cu); 4092 } 4093 local_symbols = new->locals; 4094 using_directives = new->using_directives; 4095 } 4096 4097 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET. 4098 Return 1 if the attributes are present and valid, otherwise, return 0. 4099 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */ 4100 4101 static int 4102 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return, 4103 CORE_ADDR *high_return, struct dwarf2_cu *cu, 4104 struct partial_symtab *ranges_pst) 4105 { 4106 struct objfile *objfile = cu->objfile; 4107 struct comp_unit_head *cu_header = &cu->header; 4108 bfd *obfd = objfile->obfd; 4109 unsigned int addr_size = cu_header->addr_size; 4110 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); 4111 /* Base address selection entry. */ 4112 CORE_ADDR base; 4113 int found_base; 4114 unsigned int dummy; 4115 gdb_byte *buffer; 4116 CORE_ADDR marker; 4117 int low_set; 4118 CORE_ADDR low = 0; 4119 CORE_ADDR high = 0; 4120 CORE_ADDR baseaddr; 4121 4122 found_base = cu->base_known; 4123 base = cu->base_address; 4124 4125 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges); 4126 if (offset >= dwarf2_per_objfile->ranges.size) 4127 { 4128 complaint (&symfile_complaints, 4129 _("Offset %d out of bounds for DW_AT_ranges attribute"), 4130 offset); 4131 return 0; 4132 } 4133 buffer = dwarf2_per_objfile->ranges.buffer + offset; 4134 4135 /* Read in the largest possible address. */ 4136 marker = read_address (obfd, buffer, cu, &dummy); 4137 if ((marker & mask) == mask) 4138 { 4139 /* If we found the largest possible address, then 4140 read the base address. */ 4141 base = read_address (obfd, buffer + addr_size, cu, &dummy); 4142 buffer += 2 * addr_size; 4143 offset += 2 * addr_size; 4144 found_base = 1; 4145 } 4146 4147 low_set = 0; 4148 4149 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 4150 4151 while (1) 4152 { 4153 CORE_ADDR range_beginning, range_end; 4154 4155 range_beginning = read_address (obfd, buffer, cu, &dummy); 4156 buffer += addr_size; 4157 range_end = read_address (obfd, buffer, cu, &dummy); 4158 buffer += addr_size; 4159 offset += 2 * addr_size; 4160 4161 /* An end of list marker is a pair of zero addresses. */ 4162 if (range_beginning == 0 && range_end == 0) 4163 /* Found the end of list entry. */ 4164 break; 4165 4166 /* Each base address selection entry is a pair of 2 values. 4167 The first is the largest possible address, the second is 4168 the base address. Check for a base address here. */ 4169 if ((range_beginning & mask) == mask) 4170 { 4171 /* If we found the largest possible address, then 4172 read the base address. */ 4173 base = read_address (obfd, buffer + addr_size, cu, &dummy); 4174 found_base = 1; 4175 continue; 4176 } 4177 4178 if (!found_base) 4179 { 4180 /* We have no valid base address for the ranges 4181 data. */ 4182 complaint (&symfile_complaints, 4183 _("Invalid .debug_ranges data (no base address)")); 4184 return 0; 4185 } 4186 4187 range_beginning += base; 4188 range_end += base; 4189 4190 if (ranges_pst != NULL && range_beginning < range_end) 4191 addrmap_set_empty (objfile->psymtabs_addrmap, 4192 range_beginning + baseaddr, range_end - 1 + baseaddr, 4193 ranges_pst); 4194 4195 /* FIXME: This is recording everything as a low-high 4196 segment of consecutive addresses. We should have a 4197 data structure for discontiguous block ranges 4198 instead. */ 4199 if (! low_set) 4200 { 4201 low = range_beginning; 4202 high = range_end; 4203 low_set = 1; 4204 } 4205 else 4206 { 4207 if (range_beginning < low) 4208 low = range_beginning; 4209 if (range_end > high) 4210 high = range_end; 4211 } 4212 } 4213 4214 if (! low_set) 4215 /* If the first entry is an end-of-list marker, the range 4216 describes an empty scope, i.e. no instructions. */ 4217 return 0; 4218 4219 if (low_return) 4220 *low_return = low; 4221 if (high_return) 4222 *high_return = high; 4223 return 1; 4224 } 4225 4226 /* Get low and high pc attributes from a die. Return 1 if the attributes 4227 are present and valid, otherwise, return 0. Return -1 if the range is 4228 discontinuous, i.e. derived from DW_AT_ranges information. */ 4229 static int 4230 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, 4231 CORE_ADDR *highpc, struct dwarf2_cu *cu, 4232 struct partial_symtab *pst) 4233 { 4234 struct attribute *attr; 4235 CORE_ADDR low = 0; 4236 CORE_ADDR high = 0; 4237 int ret = 0; 4238 4239 attr = dwarf2_attr (die, DW_AT_high_pc, cu); 4240 if (attr) 4241 { 4242 high = DW_ADDR (attr); 4243 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 4244 if (attr) 4245 low = DW_ADDR (attr); 4246 else 4247 /* Found high w/o low attribute. */ 4248 return 0; 4249 4250 /* Found consecutive range of addresses. */ 4251 ret = 1; 4252 } 4253 else 4254 { 4255 attr = dwarf2_attr (die, DW_AT_ranges, cu); 4256 if (attr != NULL) 4257 { 4258 /* Value of the DW_AT_ranges attribute is the offset in the 4259 .debug_ranges section. */ 4260 if (!dwarf2_ranges_read (DW_UNSND (attr), &low, &high, cu, pst)) 4261 return 0; 4262 /* Found discontinuous range of addresses. */ 4263 ret = -1; 4264 } 4265 } 4266 4267 if (high < low) 4268 return 0; 4269 4270 /* When using the GNU linker, .gnu.linkonce. sections are used to 4271 eliminate duplicate copies of functions and vtables and such. 4272 The linker will arbitrarily choose one and discard the others. 4273 The AT_*_pc values for such functions refer to local labels in 4274 these sections. If the section from that file was discarded, the 4275 labels are not in the output, so the relocs get a value of 0. 4276 If this is a discarded function, mark the pc bounds as invalid, 4277 so that GDB will ignore it. */ 4278 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero) 4279 return 0; 4280 4281 *lowpc = low; 4282 *highpc = high; 4283 return ret; 4284 } 4285 4286 /* Assuming that DIE represents a subprogram DIE or a lexical block, get 4287 its low and high PC addresses. Do nothing if these addresses could not 4288 be determined. Otherwise, set LOWPC to the low address if it is smaller, 4289 and HIGHPC to the high address if greater than HIGHPC. */ 4290 4291 static void 4292 dwarf2_get_subprogram_pc_bounds (struct die_info *die, 4293 CORE_ADDR *lowpc, CORE_ADDR *highpc, 4294 struct dwarf2_cu *cu) 4295 { 4296 CORE_ADDR low, high; 4297 struct die_info *child = die->child; 4298 4299 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL)) 4300 { 4301 *lowpc = min (*lowpc, low); 4302 *highpc = max (*highpc, high); 4303 } 4304 4305 /* If the language does not allow nested subprograms (either inside 4306 subprograms or lexical blocks), we're done. */ 4307 if (cu->language != language_ada) 4308 return; 4309 4310 /* Check all the children of the given DIE. If it contains nested 4311 subprograms, then check their pc bounds. Likewise, we need to 4312 check lexical blocks as well, as they may also contain subprogram 4313 definitions. */ 4314 while (child && child->tag) 4315 { 4316 if (child->tag == DW_TAG_subprogram 4317 || child->tag == DW_TAG_lexical_block) 4318 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu); 4319 child = sibling_die (child); 4320 } 4321 } 4322 4323 /* Get the low and high pc's represented by the scope DIE, and store 4324 them in *LOWPC and *HIGHPC. If the correct values can't be 4325 determined, set *LOWPC to -1 and *HIGHPC to 0. */ 4326 4327 static void 4328 get_scope_pc_bounds (struct die_info *die, 4329 CORE_ADDR *lowpc, CORE_ADDR *highpc, 4330 struct dwarf2_cu *cu) 4331 { 4332 CORE_ADDR best_low = (CORE_ADDR) -1; 4333 CORE_ADDR best_high = (CORE_ADDR) 0; 4334 CORE_ADDR current_low, current_high; 4335 4336 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)) 4337 { 4338 best_low = current_low; 4339 best_high = current_high; 4340 } 4341 else 4342 { 4343 struct die_info *child = die->child; 4344 4345 while (child && child->tag) 4346 { 4347 switch (child->tag) { 4348 case DW_TAG_subprogram: 4349 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu); 4350 break; 4351 case DW_TAG_namespace: 4352 case DW_TAG_module: 4353 /* FIXME: carlton/2004-01-16: Should we do this for 4354 DW_TAG_class_type/DW_TAG_structure_type, too? I think 4355 that current GCC's always emit the DIEs corresponding 4356 to definitions of methods of classes as children of a 4357 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to 4358 the DIEs giving the declarations, which could be 4359 anywhere). But I don't see any reason why the 4360 standards says that they have to be there. */ 4361 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu); 4362 4363 if (current_low != ((CORE_ADDR) -1)) 4364 { 4365 best_low = min (best_low, current_low); 4366 best_high = max (best_high, current_high); 4367 } 4368 break; 4369 default: 4370 /* Ignore. */ 4371 break; 4372 } 4373 4374 child = sibling_die (child); 4375 } 4376 } 4377 4378 *lowpc = best_low; 4379 *highpc = best_high; 4380 } 4381 4382 /* Record the address ranges for BLOCK, offset by BASEADDR, as given 4383 in DIE. */ 4384 static void 4385 dwarf2_record_block_ranges (struct die_info *die, struct block *block, 4386 CORE_ADDR baseaddr, struct dwarf2_cu *cu) 4387 { 4388 struct attribute *attr; 4389 4390 attr = dwarf2_attr (die, DW_AT_high_pc, cu); 4391 if (attr) 4392 { 4393 CORE_ADDR high = DW_ADDR (attr); 4394 4395 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 4396 if (attr) 4397 { 4398 CORE_ADDR low = DW_ADDR (attr); 4399 4400 record_block_range (block, baseaddr + low, baseaddr + high - 1); 4401 } 4402 } 4403 4404 attr = dwarf2_attr (die, DW_AT_ranges, cu); 4405 if (attr) 4406 { 4407 bfd *obfd = cu->objfile->obfd; 4408 4409 /* The value of the DW_AT_ranges attribute is the offset of the 4410 address range list in the .debug_ranges section. */ 4411 unsigned long offset = DW_UNSND (attr); 4412 gdb_byte *buffer = dwarf2_per_objfile->ranges.buffer + offset; 4413 4414 /* For some target architectures, but not others, the 4415 read_address function sign-extends the addresses it returns. 4416 To recognize base address selection entries, we need a 4417 mask. */ 4418 unsigned int addr_size = cu->header.addr_size; 4419 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); 4420 4421 /* The base address, to which the next pair is relative. Note 4422 that this 'base' is a DWARF concept: most entries in a range 4423 list are relative, to reduce the number of relocs against the 4424 debugging information. This is separate from this function's 4425 'baseaddr' argument, which GDB uses to relocate debugging 4426 information from a shared library based on the address at 4427 which the library was loaded. */ 4428 CORE_ADDR base = cu->base_address; 4429 int base_known = cu->base_known; 4430 4431 gdb_assert (dwarf2_per_objfile->ranges.readin); 4432 if (offset >= dwarf2_per_objfile->ranges.size) 4433 { 4434 complaint (&symfile_complaints, 4435 _("Offset %lu out of bounds for DW_AT_ranges attribute"), 4436 offset); 4437 return; 4438 } 4439 4440 for (;;) 4441 { 4442 unsigned int bytes_read; 4443 CORE_ADDR start, end; 4444 4445 start = read_address (obfd, buffer, cu, &bytes_read); 4446 buffer += bytes_read; 4447 end = read_address (obfd, buffer, cu, &bytes_read); 4448 buffer += bytes_read; 4449 4450 /* Did we find the end of the range list? */ 4451 if (start == 0 && end == 0) 4452 break; 4453 4454 /* Did we find a base address selection entry? */ 4455 else if ((start & base_select_mask) == base_select_mask) 4456 { 4457 base = end; 4458 base_known = 1; 4459 } 4460 4461 /* We found an ordinary address range. */ 4462 else 4463 { 4464 if (!base_known) 4465 { 4466 complaint (&symfile_complaints, 4467 _("Invalid .debug_ranges data (no base address)")); 4468 return; 4469 } 4470 4471 record_block_range (block, 4472 baseaddr + base + start, 4473 baseaddr + base + end - 1); 4474 } 4475 } 4476 } 4477 } 4478 4479 /* Add an aggregate field to the field list. */ 4480 4481 static void 4482 dwarf2_add_field (struct field_info *fip, struct die_info *die, 4483 struct dwarf2_cu *cu) 4484 { 4485 struct objfile *objfile = cu->objfile; 4486 struct gdbarch *gdbarch = get_objfile_arch (objfile); 4487 struct nextfield *new_field; 4488 struct attribute *attr; 4489 struct field *fp; 4490 char *fieldname = ""; 4491 4492 /* Allocate a new field list entry and link it in. */ 4493 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield)); 4494 make_cleanup (xfree, new_field); 4495 memset (new_field, 0, sizeof (struct nextfield)); 4496 4497 if (die->tag == DW_TAG_inheritance) 4498 { 4499 new_field->next = fip->baseclasses; 4500 fip->baseclasses = new_field; 4501 } 4502 else 4503 { 4504 new_field->next = fip->fields; 4505 fip->fields = new_field; 4506 } 4507 fip->nfields++; 4508 4509 /* Handle accessibility and virtuality of field. 4510 The default accessibility for members is public, the default 4511 accessibility for inheritance is private. */ 4512 if (die->tag != DW_TAG_inheritance) 4513 new_field->accessibility = DW_ACCESS_public; 4514 else 4515 new_field->accessibility = DW_ACCESS_private; 4516 new_field->virtuality = DW_VIRTUALITY_none; 4517 4518 attr = dwarf2_attr (die, DW_AT_accessibility, cu); 4519 if (attr) 4520 new_field->accessibility = DW_UNSND (attr); 4521 if (new_field->accessibility != DW_ACCESS_public) 4522 fip->non_public_fields = 1; 4523 attr = dwarf2_attr (die, DW_AT_virtuality, cu); 4524 if (attr) 4525 new_field->virtuality = DW_UNSND (attr); 4526 4527 fp = &new_field->field; 4528 4529 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu)) 4530 { 4531 /* Data member other than a C++ static data member. */ 4532 4533 /* Get type of field. */ 4534 fp->type = die_type (die, cu); 4535 4536 SET_FIELD_BITPOS (*fp, 0); 4537 4538 /* Get bit size of field (zero if none). */ 4539 attr = dwarf2_attr (die, DW_AT_bit_size, cu); 4540 if (attr) 4541 { 4542 FIELD_BITSIZE (*fp) = DW_UNSND (attr); 4543 } 4544 else 4545 { 4546 FIELD_BITSIZE (*fp) = 0; 4547 } 4548 4549 /* Get bit offset of field. */ 4550 attr = dwarf2_attr (die, DW_AT_data_member_location, cu); 4551 if (attr) 4552 { 4553 int byte_offset = 0; 4554 4555 if (attr_form_is_section_offset (attr)) 4556 dwarf2_complex_location_expr_complaint (); 4557 else if (attr_form_is_constant (attr)) 4558 byte_offset = dwarf2_get_attr_constant_value (attr, 0); 4559 else if (attr_form_is_block (attr)) 4560 byte_offset = decode_locdesc (DW_BLOCK (attr), cu); 4561 else 4562 dwarf2_complex_location_expr_complaint (); 4563 4564 SET_FIELD_BITPOS (*fp, byte_offset * bits_per_byte); 4565 } 4566 attr = dwarf2_attr (die, DW_AT_bit_offset, cu); 4567 if (attr) 4568 { 4569 if (gdbarch_bits_big_endian (gdbarch)) 4570 { 4571 /* For big endian bits, the DW_AT_bit_offset gives the 4572 additional bit offset from the MSB of the containing 4573 anonymous object to the MSB of the field. We don't 4574 have to do anything special since we don't need to 4575 know the size of the anonymous object. */ 4576 FIELD_BITPOS (*fp) += DW_UNSND (attr); 4577 } 4578 else 4579 { 4580 /* For little endian bits, compute the bit offset to the 4581 MSB of the anonymous object, subtract off the number of 4582 bits from the MSB of the field to the MSB of the 4583 object, and then subtract off the number of bits of 4584 the field itself. The result is the bit offset of 4585 the LSB of the field. */ 4586 int anonymous_size; 4587 int bit_offset = DW_UNSND (attr); 4588 4589 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 4590 if (attr) 4591 { 4592 /* The size of the anonymous object containing 4593 the bit field is explicit, so use the 4594 indicated size (in bytes). */ 4595 anonymous_size = DW_UNSND (attr); 4596 } 4597 else 4598 { 4599 /* The size of the anonymous object containing 4600 the bit field must be inferred from the type 4601 attribute of the data member containing the 4602 bit field. */ 4603 anonymous_size = TYPE_LENGTH (fp->type); 4604 } 4605 FIELD_BITPOS (*fp) += anonymous_size * bits_per_byte 4606 - bit_offset - FIELD_BITSIZE (*fp); 4607 } 4608 } 4609 4610 /* Get name of field. */ 4611 fieldname = dwarf2_name (die, cu); 4612 if (fieldname == NULL) 4613 fieldname = ""; 4614 4615 /* The name is already allocated along with this objfile, so we don't 4616 need to duplicate it for the type. */ 4617 fp->name = fieldname; 4618 4619 /* Change accessibility for artificial fields (e.g. virtual table 4620 pointer or virtual base class pointer) to private. */ 4621 if (dwarf2_attr (die, DW_AT_artificial, cu)) 4622 { 4623 FIELD_ARTIFICIAL (*fp) = 1; 4624 new_field->accessibility = DW_ACCESS_private; 4625 fip->non_public_fields = 1; 4626 } 4627 } 4628 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable) 4629 { 4630 /* C++ static member. */ 4631 4632 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that 4633 is a declaration, but all versions of G++ as of this writing 4634 (so through at least 3.2.1) incorrectly generate 4635 DW_TAG_variable tags. */ 4636 4637 char *physname; 4638 4639 /* Get name of field. */ 4640 fieldname = dwarf2_name (die, cu); 4641 if (fieldname == NULL) 4642 return; 4643 4644 attr = dwarf2_attr (die, DW_AT_const_value, cu); 4645 if (attr 4646 /* Only create a symbol if this is an external value. 4647 new_symbol checks this and puts the value in the global symbol 4648 table, which we want. If it is not external, new_symbol 4649 will try to put the value in cu->list_in_scope which is wrong. */ 4650 && dwarf2_flag_true_p (die, DW_AT_external, cu)) 4651 { 4652 /* A static const member, not much different than an enum as far as 4653 we're concerned, except that we can support more types. */ 4654 new_symbol (die, NULL, cu); 4655 } 4656 4657 /* Get physical name. */ 4658 physname = (char *) dwarf2_physname (fieldname, die, cu); 4659 4660 /* The name is already allocated along with this objfile, so we don't 4661 need to duplicate it for the type. */ 4662 SET_FIELD_PHYSNAME (*fp, physname ? physname : ""); 4663 FIELD_TYPE (*fp) = die_type (die, cu); 4664 FIELD_NAME (*fp) = fieldname; 4665 } 4666 else if (die->tag == DW_TAG_inheritance) 4667 { 4668 /* C++ base class field. */ 4669 attr = dwarf2_attr (die, DW_AT_data_member_location, cu); 4670 if (attr) 4671 { 4672 int byte_offset = 0; 4673 4674 if (attr_form_is_section_offset (attr)) 4675 dwarf2_complex_location_expr_complaint (); 4676 else if (attr_form_is_constant (attr)) 4677 byte_offset = dwarf2_get_attr_constant_value (attr, 0); 4678 else if (attr_form_is_block (attr)) 4679 byte_offset = decode_locdesc (DW_BLOCK (attr), cu); 4680 else 4681 dwarf2_complex_location_expr_complaint (); 4682 4683 SET_FIELD_BITPOS (*fp, byte_offset * bits_per_byte); 4684 } 4685 FIELD_BITSIZE (*fp) = 0; 4686 FIELD_TYPE (*fp) = die_type (die, cu); 4687 FIELD_NAME (*fp) = type_name_no_tag (fp->type); 4688 fip->nbaseclasses++; 4689 } 4690 } 4691 4692 /* Add a typedef defined in the scope of the FIP's class. */ 4693 4694 static void 4695 dwarf2_add_typedef (struct field_info *fip, struct die_info *die, 4696 struct dwarf2_cu *cu) 4697 { 4698 struct objfile *objfile = cu->objfile; 4699 struct gdbarch *gdbarch = get_objfile_arch (objfile); 4700 struct typedef_field_list *new_field; 4701 struct attribute *attr; 4702 struct typedef_field *fp; 4703 char *fieldname = ""; 4704 4705 /* Allocate a new field list entry and link it in. */ 4706 new_field = xzalloc (sizeof (*new_field)); 4707 make_cleanup (xfree, new_field); 4708 4709 gdb_assert (die->tag == DW_TAG_typedef); 4710 4711 fp = &new_field->field; 4712 4713 /* Get name of field. */ 4714 fp->name = dwarf2_name (die, cu); 4715 if (fp->name == NULL) 4716 return; 4717 4718 fp->type = read_type_die (die, cu); 4719 4720 new_field->next = fip->typedef_field_list; 4721 fip->typedef_field_list = new_field; 4722 fip->typedef_field_list_count++; 4723 } 4724 4725 /* Create the vector of fields, and attach it to the type. */ 4726 4727 static void 4728 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type, 4729 struct dwarf2_cu *cu) 4730 { 4731 int nfields = fip->nfields; 4732 4733 /* Record the field count, allocate space for the array of fields, 4734 and create blank accessibility bitfields if necessary. */ 4735 TYPE_NFIELDS (type) = nfields; 4736 TYPE_FIELDS (type) = (struct field *) 4737 TYPE_ALLOC (type, sizeof (struct field) * nfields); 4738 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields); 4739 4740 if (fip->non_public_fields && cu->language != language_ada) 4741 { 4742 ALLOCATE_CPLUS_STRUCT_TYPE (type); 4743 4744 TYPE_FIELD_PRIVATE_BITS (type) = 4745 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); 4746 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields); 4747 4748 TYPE_FIELD_PROTECTED_BITS (type) = 4749 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); 4750 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields); 4751 4752 TYPE_FIELD_IGNORE_BITS (type) = 4753 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); 4754 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields); 4755 } 4756 4757 /* If the type has baseclasses, allocate and clear a bit vector for 4758 TYPE_FIELD_VIRTUAL_BITS. */ 4759 if (fip->nbaseclasses && cu->language != language_ada) 4760 { 4761 int num_bytes = B_BYTES (fip->nbaseclasses); 4762 unsigned char *pointer; 4763 4764 ALLOCATE_CPLUS_STRUCT_TYPE (type); 4765 pointer = TYPE_ALLOC (type, num_bytes); 4766 TYPE_FIELD_VIRTUAL_BITS (type) = pointer; 4767 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses); 4768 TYPE_N_BASECLASSES (type) = fip->nbaseclasses; 4769 } 4770 4771 /* Copy the saved-up fields into the field vector. Start from the head 4772 of the list, adding to the tail of the field array, so that they end 4773 up in the same order in the array in which they were added to the list. */ 4774 while (nfields-- > 0) 4775 { 4776 struct nextfield *fieldp; 4777 4778 if (fip->fields) 4779 { 4780 fieldp = fip->fields; 4781 fip->fields = fieldp->next; 4782 } 4783 else 4784 { 4785 fieldp = fip->baseclasses; 4786 fip->baseclasses = fieldp->next; 4787 } 4788 4789 TYPE_FIELD (type, nfields) = fieldp->field; 4790 switch (fieldp->accessibility) 4791 { 4792 case DW_ACCESS_private: 4793 if (cu->language != language_ada) 4794 SET_TYPE_FIELD_PRIVATE (type, nfields); 4795 break; 4796 4797 case DW_ACCESS_protected: 4798 if (cu->language != language_ada) 4799 SET_TYPE_FIELD_PROTECTED (type, nfields); 4800 break; 4801 4802 case DW_ACCESS_public: 4803 break; 4804 4805 default: 4806 /* Unknown accessibility. Complain and treat it as public. */ 4807 { 4808 complaint (&symfile_complaints, _("unsupported accessibility %d"), 4809 fieldp->accessibility); 4810 } 4811 break; 4812 } 4813 if (nfields < fip->nbaseclasses) 4814 { 4815 switch (fieldp->virtuality) 4816 { 4817 case DW_VIRTUALITY_virtual: 4818 case DW_VIRTUALITY_pure_virtual: 4819 if (cu->language == language_ada) 4820 error ("unexpected virtuality in component of Ada type"); 4821 SET_TYPE_FIELD_VIRTUAL (type, nfields); 4822 break; 4823 } 4824 } 4825 } 4826 } 4827 4828 /* Add a member function to the proper fieldlist. */ 4829 4830 static void 4831 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die, 4832 struct type *type, struct dwarf2_cu *cu) 4833 { 4834 struct objfile *objfile = cu->objfile; 4835 struct attribute *attr; 4836 struct fnfieldlist *flp; 4837 int i; 4838 struct fn_field *fnp; 4839 char *fieldname; 4840 char *physname; 4841 struct nextfnfield *new_fnfield; 4842 struct type *this_type; 4843 4844 if (cu->language == language_ada) 4845 error ("unexpected member function in Ada type"); 4846 4847 /* Get name of member function. */ 4848 fieldname = dwarf2_name (die, cu); 4849 if (fieldname == NULL) 4850 return; 4851 4852 /* Get the mangled name. */ 4853 physname = (char *) dwarf2_physname (fieldname, die, cu); 4854 4855 /* Look up member function name in fieldlist. */ 4856 for (i = 0; i < fip->nfnfields; i++) 4857 { 4858 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0) 4859 break; 4860 } 4861 4862 /* Create new list element if necessary. */ 4863 if (i < fip->nfnfields) 4864 flp = &fip->fnfieldlists[i]; 4865 else 4866 { 4867 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0) 4868 { 4869 fip->fnfieldlists = (struct fnfieldlist *) 4870 xrealloc (fip->fnfieldlists, 4871 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK) 4872 * sizeof (struct fnfieldlist)); 4873 if (fip->nfnfields == 0) 4874 make_cleanup (free_current_contents, &fip->fnfieldlists); 4875 } 4876 flp = &fip->fnfieldlists[fip->nfnfields]; 4877 flp->name = fieldname; 4878 flp->length = 0; 4879 flp->head = NULL; 4880 fip->nfnfields++; 4881 } 4882 4883 /* Create a new member function field and chain it to the field list 4884 entry. */ 4885 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield)); 4886 make_cleanup (xfree, new_fnfield); 4887 memset (new_fnfield, 0, sizeof (struct nextfnfield)); 4888 new_fnfield->next = flp->head; 4889 flp->head = new_fnfield; 4890 flp->length++; 4891 4892 /* Fill in the member function field info. */ 4893 fnp = &new_fnfield->fnfield; 4894 /* The name is already allocated along with this objfile, so we don't 4895 need to duplicate it for the type. */ 4896 fnp->physname = physname ? physname : ""; 4897 fnp->type = alloc_type (objfile); 4898 this_type = read_type_die (die, cu); 4899 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC) 4900 { 4901 int nparams = TYPE_NFIELDS (this_type); 4902 4903 /* TYPE is the domain of this method, and THIS_TYPE is the type 4904 of the method itself (TYPE_CODE_METHOD). */ 4905 smash_to_method_type (fnp->type, type, 4906 TYPE_TARGET_TYPE (this_type), 4907 TYPE_FIELDS (this_type), 4908 TYPE_NFIELDS (this_type), 4909 TYPE_VARARGS (this_type)); 4910 4911 /* Handle static member functions. 4912 Dwarf2 has no clean way to discern C++ static and non-static 4913 member functions. G++ helps GDB by marking the first 4914 parameter for non-static member functions (which is the 4915 this pointer) as artificial. We obtain this information 4916 from read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */ 4917 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0) 4918 fnp->voffset = VOFFSET_STATIC; 4919 } 4920 else 4921 complaint (&symfile_complaints, _("member function type missing for '%s'"), 4922 physname); 4923 4924 /* Get fcontext from DW_AT_containing_type if present. */ 4925 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) 4926 fnp->fcontext = die_containing_type (die, cu); 4927 4928 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const 4929 and is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */ 4930 4931 /* Get accessibility. */ 4932 attr = dwarf2_attr (die, DW_AT_accessibility, cu); 4933 if (attr) 4934 { 4935 switch (DW_UNSND (attr)) 4936 { 4937 case DW_ACCESS_private: 4938 fnp->is_private = 1; 4939 break; 4940 case DW_ACCESS_protected: 4941 fnp->is_protected = 1; 4942 break; 4943 } 4944 } 4945 4946 /* Check for artificial methods. */ 4947 attr = dwarf2_attr (die, DW_AT_artificial, cu); 4948 if (attr && DW_UNSND (attr) != 0) 4949 fnp->is_artificial = 1; 4950 4951 /* Get index in virtual function table if it is a virtual member 4952 function. For older versions of GCC, this is an offset in the 4953 appropriate virtual table, as specified by DW_AT_containing_type. 4954 For everyone else, it is an expression to be evaluated relative 4955 to the object address. */ 4956 4957 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu); 4958 if (attr) 4959 { 4960 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0) 4961 { 4962 if (DW_BLOCK (attr)->data[0] == DW_OP_constu) 4963 { 4964 /* Old-style GCC. */ 4965 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2; 4966 } 4967 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref 4968 || (DW_BLOCK (attr)->size > 1 4969 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size 4970 && DW_BLOCK (attr)->data[1] == cu->header.addr_size)) 4971 { 4972 struct dwarf_block blk; 4973 int offset; 4974 4975 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref 4976 ? 1 : 2); 4977 blk.size = DW_BLOCK (attr)->size - offset; 4978 blk.data = DW_BLOCK (attr)->data + offset; 4979 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu); 4980 if ((fnp->voffset % cu->header.addr_size) != 0) 4981 dwarf2_complex_location_expr_complaint (); 4982 else 4983 fnp->voffset /= cu->header.addr_size; 4984 fnp->voffset += 2; 4985 } 4986 else 4987 dwarf2_complex_location_expr_complaint (); 4988 4989 if (!fnp->fcontext) 4990 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0)); 4991 } 4992 else if (attr_form_is_section_offset (attr)) 4993 { 4994 dwarf2_complex_location_expr_complaint (); 4995 } 4996 else 4997 { 4998 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location", 4999 fieldname); 5000 } 5001 } 5002 else 5003 { 5004 attr = dwarf2_attr (die, DW_AT_virtuality, cu); 5005 if (attr && DW_UNSND (attr)) 5006 { 5007 /* GCC does this, as of 2008-08-25; PR debug/37237. */ 5008 complaint (&symfile_complaints, 5009 _("Member function \"%s\" (offset %d) is virtual but the vtable offset is not specified"), 5010 fieldname, die->offset); 5011 ALLOCATE_CPLUS_STRUCT_TYPE (type); 5012 TYPE_CPLUS_DYNAMIC (type) = 1; 5013 } 5014 } 5015 } 5016 5017 /* Create the vector of member function fields, and attach it to the type. */ 5018 5019 static void 5020 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type, 5021 struct dwarf2_cu *cu) 5022 { 5023 struct fnfieldlist *flp; 5024 int total_length = 0; 5025 int i; 5026 5027 if (cu->language == language_ada) 5028 error ("unexpected member functions in Ada type"); 5029 5030 ALLOCATE_CPLUS_STRUCT_TYPE (type); 5031 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *) 5032 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields); 5033 5034 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++) 5035 { 5036 struct nextfnfield *nfp = flp->head; 5037 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i); 5038 int k; 5039 5040 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name; 5041 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length; 5042 fn_flp->fn_fields = (struct fn_field *) 5043 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length); 5044 for (k = flp->length; (k--, nfp); nfp = nfp->next) 5045 fn_flp->fn_fields[k] = nfp->fnfield; 5046 5047 total_length += flp->length; 5048 } 5049 5050 TYPE_NFN_FIELDS (type) = fip->nfnfields; 5051 TYPE_NFN_FIELDS_TOTAL (type) = total_length; 5052 } 5053 5054 /* Returns non-zero if NAME is the name of a vtable member in CU's 5055 language, zero otherwise. */ 5056 static int 5057 is_vtable_name (const char *name, struct dwarf2_cu *cu) 5058 { 5059 static const char vptr[] = "_vptr"; 5060 static const char vtable[] = "vtable"; 5061 5062 /* Look for the C++ and Java forms of the vtable. */ 5063 if ((cu->language == language_java 5064 && strncmp (name, vtable, sizeof (vtable) - 1) == 0) 5065 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0 5066 && is_cplus_marker (name[sizeof (vptr) - 1]))) 5067 return 1; 5068 5069 return 0; 5070 } 5071 5072 /* GCC outputs unnamed structures that are really pointers to member 5073 functions, with the ABI-specified layout. If TYPE describes 5074 such a structure, smash it into a member function type. 5075 5076 GCC shouldn't do this; it should just output pointer to member DIEs. 5077 This is GCC PR debug/28767. */ 5078 5079 static void 5080 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile) 5081 { 5082 struct type *pfn_type, *domain_type, *new_type; 5083 5084 /* Check for a structure with no name and two children. */ 5085 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2) 5086 return; 5087 5088 /* Check for __pfn and __delta members. */ 5089 if (TYPE_FIELD_NAME (type, 0) == NULL 5090 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0 5091 || TYPE_FIELD_NAME (type, 1) == NULL 5092 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0) 5093 return; 5094 5095 /* Find the type of the method. */ 5096 pfn_type = TYPE_FIELD_TYPE (type, 0); 5097 if (pfn_type == NULL 5098 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR 5099 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC) 5100 return; 5101 5102 /* Look for the "this" argument. */ 5103 pfn_type = TYPE_TARGET_TYPE (pfn_type); 5104 if (TYPE_NFIELDS (pfn_type) == 0 5105 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */ 5106 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR) 5107 return; 5108 5109 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0)); 5110 new_type = alloc_type (objfile); 5111 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type), 5112 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type), 5113 TYPE_VARARGS (pfn_type)); 5114 smash_to_methodptr_type (type, new_type); 5115 } 5116 5117 /* Called when we find the DIE that starts a structure or union scope 5118 (definition) to process all dies that define the members of the 5119 structure or union. 5120 5121 NOTE: we need to call struct_type regardless of whether or not the 5122 DIE has an at_name attribute, since it might be an anonymous 5123 structure or union. This gets the type entered into our set of 5124 user defined types. 5125 5126 However, if the structure is incomplete (an opaque struct/union) 5127 then suppress creating a symbol table entry for it since gdb only 5128 wants to find the one with the complete definition. Note that if 5129 it is complete, we just call new_symbol, which does it's own 5130 checking about whether the struct/union is anonymous or not (and 5131 suppresses creating a symbol table entry itself). */ 5132 5133 static struct type * 5134 read_structure_type (struct die_info *die, struct dwarf2_cu *cu) 5135 { 5136 struct objfile *objfile = cu->objfile; 5137 struct type *type; 5138 struct attribute *attr; 5139 char *name; 5140 struct cleanup *back_to; 5141 5142 /* If the definition of this type lives in .debug_types, read that type. 5143 Don't follow DW_AT_specification though, that will take us back up 5144 the chain and we want to go down. */ 5145 attr = dwarf2_attr_no_follow (die, DW_AT_signature, cu); 5146 if (attr) 5147 { 5148 struct dwarf2_cu *type_cu = cu; 5149 struct die_info *type_die = follow_die_ref_or_sig (die, attr, &type_cu); 5150 5151 /* We could just recurse on read_structure_type, but we need to call 5152 get_die_type to ensure only one type for this DIE is created. 5153 This is important, for example, because for c++ classes we need 5154 TYPE_NAME set which is only done by new_symbol. Blech. */ 5155 type = read_type_die (type_die, type_cu); 5156 return set_die_type (die, type, cu); 5157 } 5158 5159 back_to = make_cleanup (null_cleanup, 0); 5160 5161 type = alloc_type (objfile); 5162 INIT_CPLUS_SPECIFIC (type); 5163 5164 name = dwarf2_name (die, cu); 5165 if (name != NULL) 5166 { 5167 if (cu->language == language_cplus 5168 || cu->language == language_java) 5169 { 5170 TYPE_TAG_NAME (type) = (char *) dwarf2_full_name (name, die, cu); 5171 if (die->tag == DW_TAG_structure_type 5172 || die->tag == DW_TAG_class_type) 5173 TYPE_NAME (type) = TYPE_TAG_NAME (type); 5174 } 5175 else 5176 { 5177 /* The name is already allocated along with this objfile, so 5178 we don't need to duplicate it for the type. */ 5179 TYPE_TAG_NAME (type) = (char *) name; 5180 if (die->tag == DW_TAG_class_type) 5181 TYPE_NAME (type) = TYPE_TAG_NAME (type); 5182 } 5183 } 5184 5185 if (die->tag == DW_TAG_structure_type) 5186 { 5187 TYPE_CODE (type) = TYPE_CODE_STRUCT; 5188 } 5189 else if (die->tag == DW_TAG_union_type) 5190 { 5191 TYPE_CODE (type) = TYPE_CODE_UNION; 5192 } 5193 else 5194 { 5195 TYPE_CODE (type) = TYPE_CODE_CLASS; 5196 } 5197 5198 if (cu->language == language_cplus && die->tag == DW_TAG_class_type) 5199 TYPE_DECLARED_CLASS (type) = 1; 5200 5201 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 5202 if (attr) 5203 { 5204 TYPE_LENGTH (type) = DW_UNSND (attr); 5205 } 5206 else 5207 { 5208 TYPE_LENGTH (type) = 0; 5209 } 5210 5211 TYPE_STUB_SUPPORTED (type) = 1; 5212 if (die_is_declaration (die, cu)) 5213 TYPE_STUB (type) = 1; 5214 else if (attr == NULL && die->child == NULL 5215 && producer_is_realview (cu->producer)) 5216 /* RealView does not output the required DW_AT_declaration 5217 on incomplete types. */ 5218 TYPE_STUB (type) = 1; 5219 5220 /* We need to add the type field to the die immediately so we don't 5221 infinitely recurse when dealing with pointers to the structure 5222 type within the structure itself. */ 5223 set_die_type (die, type, cu); 5224 5225 /* set_die_type should be already done. */ 5226 set_descriptive_type (type, die, cu); 5227 5228 if (die->child != NULL && ! die_is_declaration (die, cu)) 5229 { 5230 struct field_info fi; 5231 struct die_info *child_die; 5232 5233 memset (&fi, 0, sizeof (struct field_info)); 5234 5235 child_die = die->child; 5236 5237 while (child_die && child_die->tag) 5238 { 5239 if (child_die->tag == DW_TAG_member 5240 || child_die->tag == DW_TAG_variable) 5241 { 5242 /* NOTE: carlton/2002-11-05: A C++ static data member 5243 should be a DW_TAG_member that is a declaration, but 5244 all versions of G++ as of this writing (so through at 5245 least 3.2.1) incorrectly generate DW_TAG_variable 5246 tags for them instead. */ 5247 dwarf2_add_field (&fi, child_die, cu); 5248 } 5249 else if (child_die->tag == DW_TAG_subprogram) 5250 { 5251 /* C++ member function. */ 5252 dwarf2_add_member_fn (&fi, child_die, type, cu); 5253 } 5254 else if (child_die->tag == DW_TAG_inheritance) 5255 { 5256 /* C++ base class field. */ 5257 dwarf2_add_field (&fi, child_die, cu); 5258 } 5259 else if (child_die->tag == DW_TAG_typedef) 5260 dwarf2_add_typedef (&fi, child_die, cu); 5261 child_die = sibling_die (child_die); 5262 } 5263 5264 /* Attach fields and member functions to the type. */ 5265 if (fi.nfields) 5266 dwarf2_attach_fields_to_type (&fi, type, cu); 5267 if (fi.nfnfields) 5268 { 5269 dwarf2_attach_fn_fields_to_type (&fi, type, cu); 5270 5271 /* Get the type which refers to the base class (possibly this 5272 class itself) which contains the vtable pointer for the current 5273 class from the DW_AT_containing_type attribute. This use of 5274 DW_AT_containing_type is a GNU extension. */ 5275 5276 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) 5277 { 5278 struct type *t = die_containing_type (die, cu); 5279 5280 TYPE_VPTR_BASETYPE (type) = t; 5281 if (type == t) 5282 { 5283 int i; 5284 5285 /* Our own class provides vtbl ptr. */ 5286 for (i = TYPE_NFIELDS (t) - 1; 5287 i >= TYPE_N_BASECLASSES (t); 5288 --i) 5289 { 5290 char *fieldname = TYPE_FIELD_NAME (t, i); 5291 5292 if (is_vtable_name (fieldname, cu)) 5293 { 5294 TYPE_VPTR_FIELDNO (type) = i; 5295 break; 5296 } 5297 } 5298 5299 /* Complain if virtual function table field not found. */ 5300 if (i < TYPE_N_BASECLASSES (t)) 5301 complaint (&symfile_complaints, 5302 _("virtual function table pointer not found when defining class '%s'"), 5303 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) : 5304 ""); 5305 } 5306 else 5307 { 5308 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t); 5309 } 5310 } 5311 else if (cu->producer 5312 && strncmp (cu->producer, 5313 "IBM(R) XL C/C++ Advanced Edition", 32) == 0) 5314 { 5315 /* The IBM XLC compiler does not provide direct indication 5316 of the containing type, but the vtable pointer is 5317 always named __vfp. */ 5318 5319 int i; 5320 5321 for (i = TYPE_NFIELDS (type) - 1; 5322 i >= TYPE_N_BASECLASSES (type); 5323 --i) 5324 { 5325 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0) 5326 { 5327 TYPE_VPTR_FIELDNO (type) = i; 5328 TYPE_VPTR_BASETYPE (type) = type; 5329 break; 5330 } 5331 } 5332 } 5333 } 5334 5335 /* Copy fi.typedef_field_list linked list elements content into the 5336 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */ 5337 if (fi.typedef_field_list) 5338 { 5339 int i = fi.typedef_field_list_count; 5340 5341 ALLOCATE_CPLUS_STRUCT_TYPE (type); 5342 TYPE_TYPEDEF_FIELD_ARRAY (type) 5343 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i); 5344 TYPE_TYPEDEF_FIELD_COUNT (type) = i; 5345 5346 /* Reverse the list order to keep the debug info elements order. */ 5347 while (--i >= 0) 5348 { 5349 struct typedef_field *dest, *src; 5350 5351 dest = &TYPE_TYPEDEF_FIELD (type, i); 5352 src = &fi.typedef_field_list->field; 5353 fi.typedef_field_list = fi.typedef_field_list->next; 5354 *dest = *src; 5355 } 5356 } 5357 } 5358 5359 quirk_gcc_member_function_pointer (type, cu->objfile); 5360 5361 do_cleanups (back_to); 5362 return type; 5363 } 5364 5365 static void 5366 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu) 5367 { 5368 struct die_info *child_die = die->child; 5369 struct type *this_type; 5370 5371 this_type = get_die_type (die, cu); 5372 if (this_type == NULL) 5373 this_type = read_structure_type (die, cu); 5374 5375 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its 5376 snapshots) has been known to create a die giving a declaration 5377 for a class that has, as a child, a die giving a definition for a 5378 nested class. So we have to process our children even if the 5379 current die is a declaration. Normally, of course, a declaration 5380 won't have any children at all. */ 5381 5382 while (child_die != NULL && child_die->tag) 5383 { 5384 if (child_die->tag == DW_TAG_member 5385 || child_die->tag == DW_TAG_variable 5386 || child_die->tag == DW_TAG_inheritance) 5387 { 5388 /* Do nothing. */ 5389 } 5390 else 5391 process_die (child_die, cu); 5392 5393 child_die = sibling_die (child_die); 5394 } 5395 5396 /* Do not consider external references. According to the DWARF standard, 5397 these DIEs are identified by the fact that they have no byte_size 5398 attribute, and a declaration attribute. */ 5399 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL 5400 || !die_is_declaration (die, cu)) 5401 new_symbol (die, this_type, cu); 5402 } 5403 5404 /* Given a DW_AT_enumeration_type die, set its type. We do not 5405 complete the type's fields yet, or create any symbols. */ 5406 5407 static struct type * 5408 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu) 5409 { 5410 struct objfile *objfile = cu->objfile; 5411 struct type *type; 5412 struct attribute *attr; 5413 const char *name; 5414 5415 /* If the definition of this type lives in .debug_types, read that type. 5416 Don't follow DW_AT_specification though, that will take us back up 5417 the chain and we want to go down. */ 5418 attr = dwarf2_attr_no_follow (die, DW_AT_signature, cu); 5419 if (attr) 5420 { 5421 struct dwarf2_cu *type_cu = cu; 5422 struct die_info *type_die = follow_die_ref_or_sig (die, attr, &type_cu); 5423 5424 type = read_type_die (type_die, type_cu); 5425 return set_die_type (die, type, cu); 5426 } 5427 5428 type = alloc_type (objfile); 5429 5430 TYPE_CODE (type) = TYPE_CODE_ENUM; 5431 name = dwarf2_full_name (NULL, die, cu); 5432 if (name != NULL) 5433 TYPE_TAG_NAME (type) = (char *) name; 5434 5435 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 5436 if (attr) 5437 { 5438 TYPE_LENGTH (type) = DW_UNSND (attr); 5439 } 5440 else 5441 { 5442 TYPE_LENGTH (type) = 0; 5443 } 5444 5445 /* The enumeration DIE can be incomplete. In Ada, any type can be 5446 declared as private in the package spec, and then defined only 5447 inside the package body. Such types are known as Taft Amendment 5448 Types. When another package uses such a type, an incomplete DIE 5449 may be generated by the compiler. */ 5450 if (die_is_declaration (die, cu)) 5451 TYPE_STUB (type) = 1; 5452 5453 return set_die_type (die, type, cu); 5454 } 5455 5456 /* Given a pointer to a die which begins an enumeration, process all 5457 the dies that define the members of the enumeration, and create the 5458 symbol for the enumeration type. 5459 5460 NOTE: We reverse the order of the element list. */ 5461 5462 static void 5463 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu) 5464 { 5465 struct die_info *child_die; 5466 struct field *fields; 5467 struct symbol *sym; 5468 int num_fields; 5469 int unsigned_enum = 1; 5470 char *name; 5471 struct type *this_type; 5472 5473 num_fields = 0; 5474 fields = NULL; 5475 this_type = get_die_type (die, cu); 5476 if (this_type == NULL) 5477 this_type = read_enumeration_type (die, cu); 5478 if (die->child != NULL) 5479 { 5480 child_die = die->child; 5481 while (child_die && child_die->tag) 5482 { 5483 if (child_die->tag != DW_TAG_enumerator) 5484 { 5485 process_die (child_die, cu); 5486 } 5487 else 5488 { 5489 name = dwarf2_name (child_die, cu); 5490 if (name) 5491 { 5492 sym = new_symbol (child_die, this_type, cu); 5493 if (SYMBOL_VALUE (sym) < 0) 5494 unsigned_enum = 0; 5495 5496 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0) 5497 { 5498 fields = (struct field *) 5499 xrealloc (fields, 5500 (num_fields + DW_FIELD_ALLOC_CHUNK) 5501 * sizeof (struct field)); 5502 } 5503 5504 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym); 5505 FIELD_TYPE (fields[num_fields]) = NULL; 5506 SET_FIELD_BITPOS (fields[num_fields], SYMBOL_VALUE (sym)); 5507 FIELD_BITSIZE (fields[num_fields]) = 0; 5508 5509 num_fields++; 5510 } 5511 } 5512 5513 child_die = sibling_die (child_die); 5514 } 5515 5516 if (num_fields) 5517 { 5518 TYPE_NFIELDS (this_type) = num_fields; 5519 TYPE_FIELDS (this_type) = (struct field *) 5520 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields); 5521 memcpy (TYPE_FIELDS (this_type), fields, 5522 sizeof (struct field) * num_fields); 5523 xfree (fields); 5524 } 5525 if (unsigned_enum) 5526 TYPE_UNSIGNED (this_type) = 1; 5527 } 5528 5529 new_symbol (die, this_type, cu); 5530 } 5531 5532 /* Extract all information from a DW_TAG_array_type DIE and put it in 5533 the DIE's type field. For now, this only handles one dimensional 5534 arrays. */ 5535 5536 static struct type * 5537 read_array_type (struct die_info *die, struct dwarf2_cu *cu) 5538 { 5539 struct objfile *objfile = cu->objfile; 5540 struct die_info *child_die; 5541 struct type *type; 5542 struct type *element_type, *range_type, *index_type; 5543 struct type **range_types = NULL; 5544 struct attribute *attr; 5545 int ndim = 0; 5546 struct cleanup *back_to; 5547 char *name; 5548 5549 element_type = die_type (die, cu); 5550 5551 /* The die_type call above may have already set the type for this DIE. */ 5552 type = get_die_type (die, cu); 5553 if (type) 5554 return type; 5555 5556 /* Irix 6.2 native cc creates array types without children for 5557 arrays with unspecified length. */ 5558 if (die->child == NULL) 5559 { 5560 index_type = objfile_type (objfile)->builtin_int; 5561 range_type = create_range_type (NULL, index_type, 0, -1); 5562 type = create_array_type (NULL, element_type, range_type); 5563 return set_die_type (die, type, cu); 5564 } 5565 5566 back_to = make_cleanup (null_cleanup, NULL); 5567 child_die = die->child; 5568 while (child_die && child_die->tag) 5569 { 5570 if (child_die->tag == DW_TAG_subrange_type) 5571 { 5572 struct type *child_type = read_type_die (child_die, cu); 5573 5574 if (child_type != NULL) 5575 { 5576 /* The range type was succesfully read. Save it for 5577 the array type creation. */ 5578 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0) 5579 { 5580 range_types = (struct type **) 5581 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK) 5582 * sizeof (struct type *)); 5583 if (ndim == 0) 5584 make_cleanup (free_current_contents, &range_types); 5585 } 5586 range_types[ndim++] = child_type; 5587 } 5588 } 5589 child_die = sibling_die (child_die); 5590 } 5591 5592 /* Dwarf2 dimensions are output from left to right, create the 5593 necessary array types in backwards order. */ 5594 5595 type = element_type; 5596 5597 if (read_array_order (die, cu) == DW_ORD_col_major) 5598 { 5599 int i = 0; 5600 5601 while (i < ndim) 5602 type = create_array_type (NULL, type, range_types[i++]); 5603 } 5604 else 5605 { 5606 while (ndim-- > 0) 5607 type = create_array_type (NULL, type, range_types[ndim]); 5608 } 5609 5610 /* Understand Dwarf2 support for vector types (like they occur on 5611 the PowerPC w/ AltiVec). Gcc just adds another attribute to the 5612 array type. This is not part of the Dwarf2/3 standard yet, but a 5613 custom vendor extension. The main difference between a regular 5614 array and the vector variant is that vectors are passed by value 5615 to functions. */ 5616 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu); 5617 if (attr) 5618 make_vector_type (type); 5619 5620 name = dwarf2_name (die, cu); 5621 if (name) 5622 TYPE_NAME (type) = name; 5623 5624 /* Install the type in the die. */ 5625 set_die_type (die, type, cu); 5626 5627 /* set_die_type should be already done. */ 5628 set_descriptive_type (type, die, cu); 5629 5630 do_cleanups (back_to); 5631 5632 return type; 5633 } 5634 5635 static enum dwarf_array_dim_ordering 5636 read_array_order (struct die_info *die, struct dwarf2_cu *cu) 5637 { 5638 struct attribute *attr; 5639 5640 attr = dwarf2_attr (die, DW_AT_ordering, cu); 5641 5642 if (attr) return DW_SND (attr); 5643 5644 /* 5645 GNU F77 is a special case, as at 08/2004 array type info is the 5646 opposite order to the dwarf2 specification, but data is still 5647 laid out as per normal fortran. 5648 5649 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need 5650 version checking. 5651 */ 5652 5653 if (cu->language == language_fortran 5654 && cu->producer && strstr (cu->producer, "GNU F77")) 5655 { 5656 return DW_ORD_row_major; 5657 } 5658 5659 switch (cu->language_defn->la_array_ordering) 5660 { 5661 case array_column_major: 5662 return DW_ORD_col_major; 5663 case array_row_major: 5664 default: 5665 return DW_ORD_row_major; 5666 }; 5667 } 5668 5669 /* Extract all information from a DW_TAG_set_type DIE and put it in 5670 the DIE's type field. */ 5671 5672 static struct type * 5673 read_set_type (struct die_info *die, struct dwarf2_cu *cu) 5674 { 5675 struct type *domain_type, *set_type; 5676 struct attribute *attr; 5677 5678 domain_type = die_type (die, cu); 5679 5680 /* The die_type call above may have already set the type for this DIE. */ 5681 set_type = get_die_type (die, cu); 5682 if (set_type) 5683 return set_type; 5684 5685 set_type = create_set_type (NULL, domain_type); 5686 5687 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 5688 if (attr) 5689 TYPE_LENGTH (set_type) = DW_UNSND (attr); 5690 5691 return set_die_type (die, set_type, cu); 5692 } 5693 5694 /* First cut: install each common block member as a global variable. */ 5695 5696 static void 5697 read_common_block (struct die_info *die, struct dwarf2_cu *cu) 5698 { 5699 struct die_info *child_die; 5700 struct attribute *attr; 5701 struct symbol *sym; 5702 CORE_ADDR base = (CORE_ADDR) 0; 5703 5704 attr = dwarf2_attr (die, DW_AT_location, cu); 5705 if (attr) 5706 { 5707 /* Support the .debug_loc offsets */ 5708 if (attr_form_is_block (attr)) 5709 { 5710 base = decode_locdesc (DW_BLOCK (attr), cu); 5711 } 5712 else if (attr_form_is_section_offset (attr)) 5713 { 5714 dwarf2_complex_location_expr_complaint (); 5715 } 5716 else 5717 { 5718 dwarf2_invalid_attrib_class_complaint ("DW_AT_location", 5719 "common block member"); 5720 } 5721 } 5722 if (die->child != NULL) 5723 { 5724 child_die = die->child; 5725 while (child_die && child_die->tag) 5726 { 5727 sym = new_symbol (child_die, NULL, cu); 5728 attr = dwarf2_attr (child_die, DW_AT_data_member_location, cu); 5729 if (attr) 5730 { 5731 CORE_ADDR byte_offset = 0; 5732 5733 if (attr_form_is_section_offset (attr)) 5734 dwarf2_complex_location_expr_complaint (); 5735 else if (attr_form_is_constant (attr)) 5736 byte_offset = dwarf2_get_attr_constant_value (attr, 0); 5737 else if (attr_form_is_block (attr)) 5738 byte_offset = decode_locdesc (DW_BLOCK (attr), cu); 5739 else 5740 dwarf2_complex_location_expr_complaint (); 5741 5742 SYMBOL_VALUE_ADDRESS (sym) = base + byte_offset; 5743 add_symbol_to_list (sym, &global_symbols); 5744 } 5745 child_die = sibling_die (child_die); 5746 } 5747 } 5748 } 5749 5750 /* Create a type for a C++ namespace. */ 5751 5752 static struct type * 5753 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu) 5754 { 5755 struct objfile *objfile = cu->objfile; 5756 const char *previous_prefix, *name; 5757 int is_anonymous; 5758 struct type *type; 5759 5760 /* For extensions, reuse the type of the original namespace. */ 5761 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL) 5762 { 5763 struct die_info *ext_die; 5764 struct dwarf2_cu *ext_cu = cu; 5765 5766 ext_die = dwarf2_extension (die, &ext_cu); 5767 type = read_type_die (ext_die, ext_cu); 5768 return set_die_type (die, type, cu); 5769 } 5770 5771 name = namespace_name (die, &is_anonymous, cu); 5772 5773 /* Now build the name of the current namespace. */ 5774 5775 previous_prefix = determine_prefix (die, cu); 5776 if (previous_prefix[0] != '\0') 5777 name = typename_concat (&objfile->objfile_obstack, 5778 previous_prefix, name, 0, cu); 5779 5780 /* Create the type. */ 5781 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL, 5782 objfile); 5783 TYPE_NAME (type) = (char *) name; 5784 TYPE_TAG_NAME (type) = TYPE_NAME (type); 5785 5786 return set_die_type (die, type, cu); 5787 } 5788 5789 /* Read a C++ namespace. */ 5790 5791 static void 5792 read_namespace (struct die_info *die, struct dwarf2_cu *cu) 5793 { 5794 struct objfile *objfile = cu->objfile; 5795 const char *name; 5796 int is_anonymous; 5797 5798 /* Add a symbol associated to this if we haven't seen the namespace 5799 before. Also, add a using directive if it's an anonymous 5800 namespace. */ 5801 5802 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL) 5803 { 5804 struct type *type; 5805 5806 type = read_type_die (die, cu); 5807 new_symbol (die, type, cu); 5808 5809 name = namespace_name (die, &is_anonymous, cu); 5810 if (is_anonymous) 5811 { 5812 const char *previous_prefix = determine_prefix (die, cu); 5813 5814 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL, 5815 NULL, &objfile->objfile_obstack); 5816 } 5817 } 5818 5819 if (die->child != NULL) 5820 { 5821 struct die_info *child_die = die->child; 5822 5823 while (child_die && child_die->tag) 5824 { 5825 process_die (child_die, cu); 5826 child_die = sibling_die (child_die); 5827 } 5828 } 5829 } 5830 5831 /* Read a Fortran module as type. This DIE can be only a declaration used for 5832 imported module. Still we need that type as local Fortran "use ... only" 5833 declaration imports depend on the created type in determine_prefix. */ 5834 5835 static struct type * 5836 read_module_type (struct die_info *die, struct dwarf2_cu *cu) 5837 { 5838 struct objfile *objfile = cu->objfile; 5839 char *module_name; 5840 struct type *type; 5841 5842 module_name = dwarf2_name (die, cu); 5843 if (!module_name) 5844 complaint (&symfile_complaints, _("DW_TAG_module has no name, offset 0x%x"), 5845 die->offset); 5846 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile); 5847 5848 /* determine_prefix uses TYPE_TAG_NAME. */ 5849 TYPE_TAG_NAME (type) = TYPE_NAME (type); 5850 5851 return set_die_type (die, type, cu); 5852 } 5853 5854 /* Read a Fortran module. */ 5855 5856 static void 5857 read_module (struct die_info *die, struct dwarf2_cu *cu) 5858 { 5859 struct die_info *child_die = die->child; 5860 5861 while (child_die && child_die->tag) 5862 { 5863 process_die (child_die, cu); 5864 child_die = sibling_die (child_die); 5865 } 5866 } 5867 5868 /* Return the name of the namespace represented by DIE. Set 5869 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous 5870 namespace. */ 5871 5872 static const char * 5873 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu) 5874 { 5875 struct die_info *current_die; 5876 const char *name = NULL; 5877 5878 /* Loop through the extensions until we find a name. */ 5879 5880 for (current_die = die; 5881 current_die != NULL; 5882 current_die = dwarf2_extension (die, &cu)) 5883 { 5884 name = dwarf2_name (current_die, cu); 5885 if (name != NULL) 5886 break; 5887 } 5888 5889 /* Is it an anonymous namespace? */ 5890 5891 *is_anonymous = (name == NULL); 5892 if (*is_anonymous) 5893 name = "(anonymous namespace)"; 5894 5895 return name; 5896 } 5897 5898 /* Extract all information from a DW_TAG_pointer_type DIE and add to 5899 the user defined type vector. */ 5900 5901 static struct type * 5902 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu) 5903 { 5904 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile); 5905 struct comp_unit_head *cu_header = &cu->header; 5906 struct type *type; 5907 struct attribute *attr_byte_size; 5908 struct attribute *attr_address_class; 5909 int byte_size, addr_class; 5910 struct type *target_type; 5911 5912 target_type = die_type (die, cu); 5913 5914 /* The die_type call above may have already set the type for this DIE. */ 5915 type = get_die_type (die, cu); 5916 if (type) 5917 return type; 5918 5919 type = lookup_pointer_type (target_type); 5920 5921 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu); 5922 if (attr_byte_size) 5923 byte_size = DW_UNSND (attr_byte_size); 5924 else 5925 byte_size = cu_header->addr_size; 5926 5927 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu); 5928 if (attr_address_class) 5929 addr_class = DW_UNSND (attr_address_class); 5930 else 5931 addr_class = DW_ADDR_none; 5932 5933 /* If the pointer size or address class is different than the 5934 default, create a type variant marked as such and set the 5935 length accordingly. */ 5936 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none) 5937 { 5938 if (gdbarch_address_class_type_flags_p (gdbarch)) 5939 { 5940 int type_flags; 5941 5942 type_flags = gdbarch_address_class_type_flags 5943 (gdbarch, byte_size, addr_class); 5944 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL) 5945 == 0); 5946 type = make_type_with_address_space (type, type_flags); 5947 } 5948 else if (TYPE_LENGTH (type) != byte_size) 5949 { 5950 complaint (&symfile_complaints, _("invalid pointer size %d"), byte_size); 5951 } 5952 else 5953 { 5954 /* Should we also complain about unhandled address classes? */ 5955 } 5956 } 5957 5958 TYPE_LENGTH (type) = byte_size; 5959 return set_die_type (die, type, cu); 5960 } 5961 5962 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to 5963 the user defined type vector. */ 5964 5965 static struct type * 5966 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu) 5967 { 5968 struct type *type; 5969 struct type *to_type; 5970 struct type *domain; 5971 5972 to_type = die_type (die, cu); 5973 domain = die_containing_type (die, cu); 5974 5975 /* The calls above may have already set the type for this DIE. */ 5976 type = get_die_type (die, cu); 5977 if (type) 5978 return type; 5979 5980 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD) 5981 type = lookup_methodptr_type (to_type); 5982 else 5983 type = lookup_memberptr_type (to_type, domain); 5984 5985 return set_die_type (die, type, cu); 5986 } 5987 5988 /* Extract all information from a DW_TAG_reference_type DIE and add to 5989 the user defined type vector. */ 5990 5991 static struct type * 5992 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu) 5993 { 5994 struct comp_unit_head *cu_header = &cu->header; 5995 struct type *type, *target_type; 5996 struct attribute *attr; 5997 5998 target_type = die_type (die, cu); 5999 6000 /* The die_type call above may have already set the type for this DIE. */ 6001 type = get_die_type (die, cu); 6002 if (type) 6003 return type; 6004 6005 type = lookup_reference_type (target_type); 6006 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 6007 if (attr) 6008 { 6009 TYPE_LENGTH (type) = DW_UNSND (attr); 6010 } 6011 else 6012 { 6013 TYPE_LENGTH (type) = cu_header->addr_size; 6014 } 6015 return set_die_type (die, type, cu); 6016 } 6017 6018 static struct type * 6019 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu) 6020 { 6021 struct type *base_type, *cv_type; 6022 6023 base_type = die_type (die, cu); 6024 6025 /* The die_type call above may have already set the type for this DIE. */ 6026 cv_type = get_die_type (die, cu); 6027 if (cv_type) 6028 return cv_type; 6029 6030 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0); 6031 return set_die_type (die, cv_type, cu); 6032 } 6033 6034 static struct type * 6035 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu) 6036 { 6037 struct type *base_type, *cv_type; 6038 6039 base_type = die_type (die, cu); 6040 6041 /* The die_type call above may have already set the type for this DIE. */ 6042 cv_type = get_die_type (die, cu); 6043 if (cv_type) 6044 return cv_type; 6045 6046 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0); 6047 return set_die_type (die, cv_type, cu); 6048 } 6049 6050 /* Extract all information from a DW_TAG_string_type DIE and add to 6051 the user defined type vector. It isn't really a user defined type, 6052 but it behaves like one, with other DIE's using an AT_user_def_type 6053 attribute to reference it. */ 6054 6055 static struct type * 6056 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu) 6057 { 6058 struct objfile *objfile = cu->objfile; 6059 struct gdbarch *gdbarch = get_objfile_arch (objfile); 6060 struct type *type, *range_type, *index_type, *char_type; 6061 struct attribute *attr; 6062 unsigned int length; 6063 6064 attr = dwarf2_attr (die, DW_AT_string_length, cu); 6065 if (attr) 6066 { 6067 length = DW_UNSND (attr); 6068 } 6069 else 6070 { 6071 /* check for the DW_AT_byte_size attribute */ 6072 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 6073 if (attr) 6074 { 6075 length = DW_UNSND (attr); 6076 } 6077 else 6078 { 6079 length = 1; 6080 } 6081 } 6082 6083 index_type = objfile_type (objfile)->builtin_int; 6084 range_type = create_range_type (NULL, index_type, 1, length); 6085 char_type = language_string_char_type (cu->language_defn, gdbarch); 6086 type = create_string_type (NULL, char_type, range_type); 6087 6088 return set_die_type (die, type, cu); 6089 } 6090 6091 /* Handle DIES due to C code like: 6092 6093 struct foo 6094 { 6095 int (*funcp)(int a, long l); 6096 int b; 6097 }; 6098 6099 ('funcp' generates a DW_TAG_subroutine_type DIE) 6100 */ 6101 6102 static struct type * 6103 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu) 6104 { 6105 struct type *type; /* Type that this function returns */ 6106 struct type *ftype; /* Function that returns above type */ 6107 struct attribute *attr; 6108 6109 type = die_type (die, cu); 6110 6111 /* The die_type call above may have already set the type for this DIE. */ 6112 ftype = get_die_type (die, cu); 6113 if (ftype) 6114 return ftype; 6115 6116 ftype = lookup_function_type (type); 6117 6118 /* All functions in C++, Pascal and Java have prototypes. */ 6119 attr = dwarf2_attr (die, DW_AT_prototyped, cu); 6120 if ((attr && (DW_UNSND (attr) != 0)) 6121 || cu->language == language_cplus 6122 || cu->language == language_java 6123 || cu->language == language_pascal) 6124 TYPE_PROTOTYPED (ftype) = 1; 6125 else if (producer_is_realview (cu->producer)) 6126 /* RealView does not emit DW_AT_prototyped. We can not 6127 distinguish prototyped and unprototyped functions; default to 6128 prototyped, since that is more common in modern code (and 6129 RealView warns about unprototyped functions). */ 6130 TYPE_PROTOTYPED (ftype) = 1; 6131 6132 /* Store the calling convention in the type if it's available in 6133 the subroutine die. Otherwise set the calling convention to 6134 the default value DW_CC_normal. */ 6135 attr = dwarf2_attr (die, DW_AT_calling_convention, cu); 6136 TYPE_CALLING_CONVENTION (ftype) = attr ? DW_UNSND (attr) : DW_CC_normal; 6137 6138 /* We need to add the subroutine type to the die immediately so 6139 we don't infinitely recurse when dealing with parameters 6140 declared as the same subroutine type. */ 6141 set_die_type (die, ftype, cu); 6142 6143 if (die->child != NULL) 6144 { 6145 struct type *void_type = objfile_type (cu->objfile)->builtin_void; 6146 struct die_info *child_die; 6147 int nparams, iparams; 6148 6149 /* Count the number of parameters. 6150 FIXME: GDB currently ignores vararg functions, but knows about 6151 vararg member functions. */ 6152 nparams = 0; 6153 child_die = die->child; 6154 while (child_die && child_die->tag) 6155 { 6156 if (child_die->tag == DW_TAG_formal_parameter) 6157 nparams++; 6158 else if (child_die->tag == DW_TAG_unspecified_parameters) 6159 TYPE_VARARGS (ftype) = 1; 6160 child_die = sibling_die (child_die); 6161 } 6162 6163 /* Allocate storage for parameters and fill them in. */ 6164 TYPE_NFIELDS (ftype) = nparams; 6165 TYPE_FIELDS (ftype) = (struct field *) 6166 TYPE_ZALLOC (ftype, nparams * sizeof (struct field)); 6167 6168 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it 6169 even if we error out during the parameters reading below. */ 6170 for (iparams = 0; iparams < nparams; iparams++) 6171 TYPE_FIELD_TYPE (ftype, iparams) = void_type; 6172 6173 iparams = 0; 6174 child_die = die->child; 6175 while (child_die && child_die->tag) 6176 { 6177 if (child_die->tag == DW_TAG_formal_parameter) 6178 { 6179 /* Dwarf2 has no clean way to discern C++ static and non-static 6180 member functions. G++ helps GDB by marking the first 6181 parameter for non-static member functions (which is the 6182 this pointer) as artificial. We pass this information 6183 to dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL. */ 6184 attr = dwarf2_attr (child_die, DW_AT_artificial, cu); 6185 if (attr) 6186 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr); 6187 else 6188 { 6189 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0; 6190 6191 /* GCC/43521: In java, the formal parameter 6192 "this" is sometimes not marked with DW_AT_artificial. */ 6193 if (cu->language == language_java) 6194 { 6195 const char *name = dwarf2_name (child_die, cu); 6196 6197 if (name && !strcmp (name, "this")) 6198 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1; 6199 } 6200 } 6201 TYPE_FIELD_TYPE (ftype, iparams) = die_type (child_die, cu); 6202 iparams++; 6203 } 6204 child_die = sibling_die (child_die); 6205 } 6206 } 6207 6208 return ftype; 6209 } 6210 6211 static struct type * 6212 read_typedef (struct die_info *die, struct dwarf2_cu *cu) 6213 { 6214 struct objfile *objfile = cu->objfile; 6215 const char *name = NULL; 6216 struct type *this_type; 6217 6218 name = dwarf2_full_name (NULL, die, cu); 6219 this_type = init_type (TYPE_CODE_TYPEDEF, 0, 6220 TYPE_FLAG_TARGET_STUB, NULL, objfile); 6221 TYPE_NAME (this_type) = (char *) name; 6222 set_die_type (die, this_type, cu); 6223 TYPE_TARGET_TYPE (this_type) = die_type (die, cu); 6224 return this_type; 6225 } 6226 6227 /* Find a representation of a given base type and install 6228 it in the TYPE field of the die. */ 6229 6230 static struct type * 6231 read_base_type (struct die_info *die, struct dwarf2_cu *cu) 6232 { 6233 struct objfile *objfile = cu->objfile; 6234 struct type *type; 6235 struct attribute *attr; 6236 int encoding = 0, size = 0; 6237 char *name; 6238 enum type_code code = TYPE_CODE_INT; 6239 int type_flags = 0; 6240 struct type *target_type = NULL; 6241 6242 attr = dwarf2_attr (die, DW_AT_encoding, cu); 6243 if (attr) 6244 { 6245 encoding = DW_UNSND (attr); 6246 } 6247 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 6248 if (attr) 6249 { 6250 size = DW_UNSND (attr); 6251 } 6252 name = dwarf2_name (die, cu); 6253 if (!name) 6254 { 6255 complaint (&symfile_complaints, 6256 _("DW_AT_name missing from DW_TAG_base_type")); 6257 } 6258 6259 switch (encoding) 6260 { 6261 case DW_ATE_address: 6262 /* Turn DW_ATE_address into a void * pointer. */ 6263 code = TYPE_CODE_PTR; 6264 type_flags |= TYPE_FLAG_UNSIGNED; 6265 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile); 6266 break; 6267 case DW_ATE_boolean: 6268 code = TYPE_CODE_BOOL; 6269 type_flags |= TYPE_FLAG_UNSIGNED; 6270 break; 6271 case DW_ATE_complex_float: 6272 code = TYPE_CODE_COMPLEX; 6273 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile); 6274 break; 6275 case DW_ATE_decimal_float: 6276 code = TYPE_CODE_DECFLOAT; 6277 break; 6278 case DW_ATE_float: 6279 code = TYPE_CODE_FLT; 6280 break; 6281 case DW_ATE_signed: 6282 break; 6283 case DW_ATE_unsigned: 6284 type_flags |= TYPE_FLAG_UNSIGNED; 6285 break; 6286 case DW_ATE_signed_char: 6287 if (cu->language == language_ada || cu->language == language_m2 6288 || cu->language == language_pascal) 6289 code = TYPE_CODE_CHAR; 6290 break; 6291 case DW_ATE_unsigned_char: 6292 if (cu->language == language_ada || cu->language == language_m2 6293 || cu->language == language_pascal) 6294 code = TYPE_CODE_CHAR; 6295 type_flags |= TYPE_FLAG_UNSIGNED; 6296 break; 6297 case DW_ATE_UTF: 6298 /* We just treat this as an integer and then recognize the 6299 type by name elsewhere. */ 6300 break; 6301 6302 default: 6303 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"), 6304 dwarf_type_encoding_name (encoding)); 6305 break; 6306 } 6307 6308 type = init_type (code, size, type_flags, NULL, objfile); 6309 TYPE_NAME (type) = name; 6310 TYPE_TARGET_TYPE (type) = target_type; 6311 6312 if (name && strcmp (name, "char") == 0) 6313 TYPE_NOSIGN (type) = 1; 6314 6315 return set_die_type (die, type, cu); 6316 } 6317 6318 /* Read the given DW_AT_subrange DIE. */ 6319 6320 static struct type * 6321 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu) 6322 { 6323 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile); 6324 struct type *base_type; 6325 struct type *range_type; 6326 struct attribute *attr; 6327 LONGEST low = 0; 6328 LONGEST high = -1; 6329 char *name; 6330 LONGEST negative_mask; 6331 6332 base_type = die_type (die, cu); 6333 6334 /* The die_type call above may have already set the type for this DIE. */ 6335 range_type = get_die_type (die, cu); 6336 if (range_type) 6337 return range_type; 6338 6339 if (cu->language == language_fortran) 6340 { 6341 /* FORTRAN implies a lower bound of 1, if not given. */ 6342 low = 1; 6343 } 6344 6345 /* FIXME: For variable sized arrays either of these could be 6346 a variable rather than a constant value. We'll allow it, 6347 but we don't know how to handle it. */ 6348 attr = dwarf2_attr (die, DW_AT_lower_bound, cu); 6349 if (attr) 6350 low = dwarf2_get_attr_constant_value (attr, 0); 6351 6352 attr = dwarf2_attr (die, DW_AT_upper_bound, cu); 6353 if (attr) 6354 { 6355 if (attr->form == DW_FORM_block1 || is_ref_attr (attr)) 6356 { 6357 /* GCC encodes arrays with unspecified or dynamic length 6358 with a DW_FORM_block1 attribute or a reference attribute. 6359 FIXME: GDB does not yet know how to handle dynamic 6360 arrays properly, treat them as arrays with unspecified 6361 length for now. 6362 6363 FIXME: jimb/2003-09-22: GDB does not really know 6364 how to handle arrays of unspecified length 6365 either; we just represent them as zero-length 6366 arrays. Choose an appropriate upper bound given 6367 the lower bound we've computed above. */ 6368 high = low - 1; 6369 } 6370 else 6371 high = dwarf2_get_attr_constant_value (attr, 1); 6372 } 6373 else 6374 { 6375 attr = dwarf2_attr (die, DW_AT_count, cu); 6376 if (attr) 6377 { 6378 int count = dwarf2_get_attr_constant_value (attr, 1); 6379 high = low + count - 1; 6380 } 6381 } 6382 6383 /* Dwarf-2 specifications explicitly allows to create subrange types 6384 without specifying a base type. 6385 In that case, the base type must be set to the type of 6386 the lower bound, upper bound or count, in that order, if any of these 6387 three attributes references an object that has a type. 6388 If no base type is found, the Dwarf-2 specifications say that 6389 a signed integer type of size equal to the size of an address should 6390 be used. 6391 For the following C code: `extern char gdb_int [];' 6392 GCC produces an empty range DIE. 6393 FIXME: muller/2010-05-28: Possible references to object for low bound, 6394 high bound or count are not yet handled by this code. 6395 */ 6396 if (TYPE_CODE (base_type) == TYPE_CODE_VOID) 6397 { 6398 struct objfile *objfile = cu->objfile; 6399 struct gdbarch *gdbarch = get_objfile_arch (objfile); 6400 int addr_size = gdbarch_addr_bit (gdbarch) /8; 6401 struct type *int_type = objfile_type (objfile)->builtin_int; 6402 6403 /* Test "int", "long int", and "long long int" objfile types, 6404 and select the first one having a size above or equal to the 6405 architecture address size. */ 6406 if (int_type && TYPE_LENGTH (int_type) >= addr_size) 6407 base_type = int_type; 6408 else 6409 { 6410 int_type = objfile_type (objfile)->builtin_long; 6411 if (int_type && TYPE_LENGTH (int_type) >= addr_size) 6412 base_type = int_type; 6413 else 6414 { 6415 int_type = objfile_type (objfile)->builtin_long_long; 6416 if (int_type && TYPE_LENGTH (int_type) >= addr_size) 6417 base_type = int_type; 6418 } 6419 } 6420 } 6421 6422 negative_mask = 6423 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1); 6424 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask)) 6425 low |= negative_mask; 6426 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask)) 6427 high |= negative_mask; 6428 6429 range_type = create_range_type (NULL, base_type, low, high); 6430 6431 /* Mark arrays with dynamic length at least as an array of unspecified 6432 length. GDB could check the boundary but before it gets implemented at 6433 least allow accessing the array elements. */ 6434 if (attr && attr->form == DW_FORM_block1) 6435 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1; 6436 6437 name = dwarf2_name (die, cu); 6438 if (name) 6439 TYPE_NAME (range_type) = name; 6440 6441 attr = dwarf2_attr (die, DW_AT_byte_size, cu); 6442 if (attr) 6443 TYPE_LENGTH (range_type) = DW_UNSND (attr); 6444 6445 set_die_type (die, range_type, cu); 6446 6447 /* set_die_type should be already done. */ 6448 set_descriptive_type (range_type, die, cu); 6449 6450 return range_type; 6451 } 6452 6453 static struct type * 6454 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu) 6455 { 6456 struct type *type; 6457 6458 /* For now, we only support the C meaning of an unspecified type: void. */ 6459 6460 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile); 6461 TYPE_NAME (type) = dwarf2_name (die, cu); 6462 6463 return set_die_type (die, type, cu); 6464 } 6465 6466 /* Trivial hash function for die_info: the hash value of a DIE 6467 is its offset in .debug_info for this objfile. */ 6468 6469 static hashval_t 6470 die_hash (const void *item) 6471 { 6472 const struct die_info *die = item; 6473 6474 return die->offset; 6475 } 6476 6477 /* Trivial comparison function for die_info structures: two DIEs 6478 are equal if they have the same offset. */ 6479 6480 static int 6481 die_eq (const void *item_lhs, const void *item_rhs) 6482 { 6483 const struct die_info *die_lhs = item_lhs; 6484 const struct die_info *die_rhs = item_rhs; 6485 6486 return die_lhs->offset == die_rhs->offset; 6487 } 6488 6489 /* Read a whole compilation unit into a linked list of dies. */ 6490 6491 static struct die_info * 6492 read_comp_unit (gdb_byte *info_ptr, struct dwarf2_cu *cu) 6493 { 6494 struct die_reader_specs reader_specs; 6495 6496 gdb_assert (cu->die_hash == NULL); 6497 cu->die_hash 6498 = htab_create_alloc_ex (cu->header.length / 12, 6499 die_hash, 6500 die_eq, 6501 NULL, 6502 &cu->comp_unit_obstack, 6503 hashtab_obstack_allocate, 6504 dummy_obstack_deallocate); 6505 6506 init_cu_die_reader (&reader_specs, cu); 6507 6508 return read_die_and_children (&reader_specs, info_ptr, &info_ptr, NULL); 6509 } 6510 6511 /* Main entry point for reading a DIE and all children. 6512 Read the DIE and dump it if requested. */ 6513 6514 static struct die_info * 6515 read_die_and_children (const struct die_reader_specs *reader, 6516 gdb_byte *info_ptr, 6517 gdb_byte **new_info_ptr, 6518 struct die_info *parent) 6519 { 6520 struct die_info *result = read_die_and_children_1 (reader, info_ptr, 6521 new_info_ptr, parent); 6522 6523 if (dwarf2_die_debug) 6524 { 6525 fprintf_unfiltered (gdb_stdlog, 6526 "\nRead die from %s of %s:\n", 6527 reader->buffer == dwarf2_per_objfile->info.buffer 6528 ? ".debug_info" 6529 : reader->buffer == dwarf2_per_objfile->types.buffer 6530 ? ".debug_types" 6531 : "unknown section", 6532 reader->abfd->filename); 6533 dump_die (result, dwarf2_die_debug); 6534 } 6535 6536 return result; 6537 } 6538 6539 /* Read a single die and all its descendents. Set the die's sibling 6540 field to NULL; set other fields in the die correctly, and set all 6541 of the descendents' fields correctly. Set *NEW_INFO_PTR to the 6542 location of the info_ptr after reading all of those dies. PARENT 6543 is the parent of the die in question. */ 6544 6545 static struct die_info * 6546 read_die_and_children_1 (const struct die_reader_specs *reader, 6547 gdb_byte *info_ptr, 6548 gdb_byte **new_info_ptr, 6549 struct die_info *parent) 6550 { 6551 struct die_info *die; 6552 gdb_byte *cur_ptr; 6553 int has_children; 6554 6555 cur_ptr = read_full_die (reader, &die, info_ptr, &has_children); 6556 if (die == NULL) 6557 { 6558 *new_info_ptr = cur_ptr; 6559 return NULL; 6560 } 6561 store_in_ref_table (die, reader->cu); 6562 6563 if (has_children) 6564 die->child = read_die_and_siblings (reader, cur_ptr, new_info_ptr, die); 6565 else 6566 { 6567 die->child = NULL; 6568 *new_info_ptr = cur_ptr; 6569 } 6570 6571 die->sibling = NULL; 6572 die->parent = parent; 6573 return die; 6574 } 6575 6576 /* Read a die, all of its descendents, and all of its siblings; set 6577 all of the fields of all of the dies correctly. Arguments are as 6578 in read_die_and_children. */ 6579 6580 static struct die_info * 6581 read_die_and_siblings (const struct die_reader_specs *reader, 6582 gdb_byte *info_ptr, 6583 gdb_byte **new_info_ptr, 6584 struct die_info *parent) 6585 { 6586 struct die_info *first_die, *last_sibling; 6587 gdb_byte *cur_ptr; 6588 6589 cur_ptr = info_ptr; 6590 first_die = last_sibling = NULL; 6591 6592 while (1) 6593 { 6594 struct die_info *die 6595 = read_die_and_children_1 (reader, cur_ptr, &cur_ptr, parent); 6596 6597 if (die == NULL) 6598 { 6599 *new_info_ptr = cur_ptr; 6600 return first_die; 6601 } 6602 6603 if (!first_die) 6604 first_die = die; 6605 else 6606 last_sibling->sibling = die; 6607 6608 last_sibling = die; 6609 } 6610 } 6611 6612 /* Read the die from the .debug_info section buffer. Set DIEP to 6613 point to a newly allocated die with its information, except for its 6614 child, sibling, and parent fields. Set HAS_CHILDREN to tell 6615 whether the die has children or not. */ 6616 6617 static gdb_byte * 6618 read_full_die (const struct die_reader_specs *reader, 6619 struct die_info **diep, gdb_byte *info_ptr, 6620 int *has_children) 6621 { 6622 unsigned int abbrev_number, bytes_read, i, offset; 6623 struct abbrev_info *abbrev; 6624 struct die_info *die; 6625 struct dwarf2_cu *cu = reader->cu; 6626 bfd *abfd = reader->abfd; 6627 6628 offset = info_ptr - reader->buffer; 6629 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 6630 info_ptr += bytes_read; 6631 if (!abbrev_number) 6632 { 6633 *diep = NULL; 6634 *has_children = 0; 6635 return info_ptr; 6636 } 6637 6638 abbrev = dwarf2_lookup_abbrev (abbrev_number, cu); 6639 if (!abbrev) 6640 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"), 6641 abbrev_number, 6642 bfd_get_filename (abfd)); 6643 6644 die = dwarf_alloc_die (cu, abbrev->num_attrs); 6645 die->offset = offset; 6646 die->tag = abbrev->tag; 6647 die->abbrev = abbrev_number; 6648 6649 die->num_attrs = abbrev->num_attrs; 6650 6651 for (i = 0; i < abbrev->num_attrs; ++i) 6652 info_ptr = read_attribute (&die->attrs[i], &abbrev->attrs[i], 6653 abfd, info_ptr, cu); 6654 6655 *diep = die; 6656 *has_children = abbrev->has_children; 6657 return info_ptr; 6658 } 6659 6660 /* In DWARF version 2, the description of the debugging information is 6661 stored in a separate .debug_abbrev section. Before we read any 6662 dies from a section we read in all abbreviations and install them 6663 in a hash table. This function also sets flags in CU describing 6664 the data found in the abbrev table. */ 6665 6666 static void 6667 dwarf2_read_abbrevs (bfd *abfd, struct dwarf2_cu *cu) 6668 { 6669 struct comp_unit_head *cu_header = &cu->header; 6670 gdb_byte *abbrev_ptr; 6671 struct abbrev_info *cur_abbrev; 6672 unsigned int abbrev_number, bytes_read, abbrev_name; 6673 unsigned int abbrev_form, hash_number; 6674 struct attr_abbrev *cur_attrs; 6675 unsigned int allocated_attrs; 6676 6677 /* Initialize dwarf2 abbrevs */ 6678 obstack_init (&cu->abbrev_obstack); 6679 cu->dwarf2_abbrevs = obstack_alloc (&cu->abbrev_obstack, 6680 (ABBREV_HASH_SIZE 6681 * sizeof (struct abbrev_info *))); 6682 memset (cu->dwarf2_abbrevs, 0, 6683 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *)); 6684 6685 dwarf2_read_section (dwarf2_per_objfile->objfile, 6686 &dwarf2_per_objfile->abbrev); 6687 abbrev_ptr = dwarf2_per_objfile->abbrev.buffer + cu_header->abbrev_offset; 6688 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 6689 abbrev_ptr += bytes_read; 6690 6691 allocated_attrs = ATTR_ALLOC_CHUNK; 6692 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev)); 6693 6694 /* loop until we reach an abbrev number of 0 */ 6695 while (abbrev_number) 6696 { 6697 cur_abbrev = dwarf_alloc_abbrev (cu); 6698 6699 /* read in abbrev header */ 6700 cur_abbrev->number = abbrev_number; 6701 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 6702 abbrev_ptr += bytes_read; 6703 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr); 6704 abbrev_ptr += 1; 6705 6706 if (cur_abbrev->tag == DW_TAG_namespace) 6707 cu->has_namespace_info = 1; 6708 6709 /* now read in declarations */ 6710 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 6711 abbrev_ptr += bytes_read; 6712 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 6713 abbrev_ptr += bytes_read; 6714 while (abbrev_name) 6715 { 6716 if (cur_abbrev->num_attrs == allocated_attrs) 6717 { 6718 allocated_attrs += ATTR_ALLOC_CHUNK; 6719 cur_attrs 6720 = xrealloc (cur_attrs, (allocated_attrs 6721 * sizeof (struct attr_abbrev))); 6722 } 6723 6724 /* Record whether this compilation unit might have 6725 inter-compilation-unit references. If we don't know what form 6726 this attribute will have, then it might potentially be a 6727 DW_FORM_ref_addr, so we conservatively expect inter-CU 6728 references. */ 6729 6730 if (abbrev_form == DW_FORM_ref_addr 6731 || abbrev_form == DW_FORM_indirect) 6732 cu->has_form_ref_addr = 1; 6733 6734 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name; 6735 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form; 6736 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 6737 abbrev_ptr += bytes_read; 6738 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 6739 abbrev_ptr += bytes_read; 6740 } 6741 6742 cur_abbrev->attrs = obstack_alloc (&cu->abbrev_obstack, 6743 (cur_abbrev->num_attrs 6744 * sizeof (struct attr_abbrev))); 6745 memcpy (cur_abbrev->attrs, cur_attrs, 6746 cur_abbrev->num_attrs * sizeof (struct attr_abbrev)); 6747 6748 hash_number = abbrev_number % ABBREV_HASH_SIZE; 6749 cur_abbrev->next = cu->dwarf2_abbrevs[hash_number]; 6750 cu->dwarf2_abbrevs[hash_number] = cur_abbrev; 6751 6752 /* Get next abbreviation. 6753 Under Irix6 the abbreviations for a compilation unit are not 6754 always properly terminated with an abbrev number of 0. 6755 Exit loop if we encounter an abbreviation which we have 6756 already read (which means we are about to read the abbreviations 6757 for the next compile unit) or if the end of the abbreviation 6758 table is reached. */ 6759 if ((unsigned int) (abbrev_ptr - dwarf2_per_objfile->abbrev.buffer) 6760 >= dwarf2_per_objfile->abbrev.size) 6761 break; 6762 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); 6763 abbrev_ptr += bytes_read; 6764 if (dwarf2_lookup_abbrev (abbrev_number, cu) != NULL) 6765 break; 6766 } 6767 6768 xfree (cur_attrs); 6769 } 6770 6771 /* Release the memory used by the abbrev table for a compilation unit. */ 6772 6773 static void 6774 dwarf2_free_abbrev_table (void *ptr_to_cu) 6775 { 6776 struct dwarf2_cu *cu = ptr_to_cu; 6777 6778 obstack_free (&cu->abbrev_obstack, NULL); 6779 cu->dwarf2_abbrevs = NULL; 6780 } 6781 6782 /* Lookup an abbrev_info structure in the abbrev hash table. */ 6783 6784 static struct abbrev_info * 6785 dwarf2_lookup_abbrev (unsigned int number, struct dwarf2_cu *cu) 6786 { 6787 unsigned int hash_number; 6788 struct abbrev_info *abbrev; 6789 6790 hash_number = number % ABBREV_HASH_SIZE; 6791 abbrev = cu->dwarf2_abbrevs[hash_number]; 6792 6793 while (abbrev) 6794 { 6795 if (abbrev->number == number) 6796 return abbrev; 6797 else 6798 abbrev = abbrev->next; 6799 } 6800 return NULL; 6801 } 6802 6803 /* Returns nonzero if TAG represents a type that we might generate a partial 6804 symbol for. */ 6805 6806 static int 6807 is_type_tag_for_partial (int tag) 6808 { 6809 switch (tag) 6810 { 6811 #if 0 6812 /* Some types that would be reasonable to generate partial symbols for, 6813 that we don't at present. */ 6814 case DW_TAG_array_type: 6815 case DW_TAG_file_type: 6816 case DW_TAG_ptr_to_member_type: 6817 case DW_TAG_set_type: 6818 case DW_TAG_string_type: 6819 case DW_TAG_subroutine_type: 6820 #endif 6821 case DW_TAG_base_type: 6822 case DW_TAG_class_type: 6823 case DW_TAG_interface_type: 6824 case DW_TAG_enumeration_type: 6825 case DW_TAG_structure_type: 6826 case DW_TAG_subrange_type: 6827 case DW_TAG_typedef: 6828 case DW_TAG_union_type: 6829 return 1; 6830 default: 6831 return 0; 6832 } 6833 } 6834 6835 /* Load all DIEs that are interesting for partial symbols into memory. */ 6836 6837 static struct partial_die_info * 6838 load_partial_dies (bfd *abfd, gdb_byte *buffer, gdb_byte *info_ptr, 6839 int building_psymtab, struct dwarf2_cu *cu) 6840 { 6841 struct partial_die_info *part_die; 6842 struct partial_die_info *parent_die, *last_die, *first_die = NULL; 6843 struct abbrev_info *abbrev; 6844 unsigned int bytes_read; 6845 unsigned int load_all = 0; 6846 6847 int nesting_level = 1; 6848 6849 parent_die = NULL; 6850 last_die = NULL; 6851 6852 if (cu->per_cu && cu->per_cu->load_all_dies) 6853 load_all = 1; 6854 6855 cu->partial_dies 6856 = htab_create_alloc_ex (cu->header.length / 12, 6857 partial_die_hash, 6858 partial_die_eq, 6859 NULL, 6860 &cu->comp_unit_obstack, 6861 hashtab_obstack_allocate, 6862 dummy_obstack_deallocate); 6863 6864 part_die = obstack_alloc (&cu->comp_unit_obstack, 6865 sizeof (struct partial_die_info)); 6866 6867 while (1) 6868 { 6869 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu); 6870 6871 /* A NULL abbrev means the end of a series of children. */ 6872 if (abbrev == NULL) 6873 { 6874 if (--nesting_level == 0) 6875 { 6876 /* PART_DIE was probably the last thing allocated on the 6877 comp_unit_obstack, so we could call obstack_free 6878 here. We don't do that because the waste is small, 6879 and will be cleaned up when we're done with this 6880 compilation unit. This way, we're also more robust 6881 against other users of the comp_unit_obstack. */ 6882 return first_die; 6883 } 6884 info_ptr += bytes_read; 6885 last_die = parent_die; 6886 parent_die = parent_die->die_parent; 6887 continue; 6888 } 6889 6890 /* Check whether this DIE is interesting enough to save. Normally 6891 we would not be interested in members here, but there may be 6892 later variables referencing them via DW_AT_specification (for 6893 static members). */ 6894 if (!load_all 6895 && !is_type_tag_for_partial (abbrev->tag) 6896 && abbrev->tag != DW_TAG_enumerator 6897 && abbrev->tag != DW_TAG_subprogram 6898 && abbrev->tag != DW_TAG_lexical_block 6899 && abbrev->tag != DW_TAG_variable 6900 && abbrev->tag != DW_TAG_namespace 6901 && abbrev->tag != DW_TAG_module 6902 && abbrev->tag != DW_TAG_member) 6903 { 6904 /* Otherwise we skip to the next sibling, if any. */ 6905 info_ptr = skip_one_die (buffer, info_ptr + bytes_read, abbrev, cu); 6906 continue; 6907 } 6908 6909 info_ptr = read_partial_die (part_die, abbrev, bytes_read, abfd, 6910 buffer, info_ptr, cu); 6911 6912 /* This two-pass algorithm for processing partial symbols has a 6913 high cost in cache pressure. Thus, handle some simple cases 6914 here which cover the majority of C partial symbols. DIEs 6915 which neither have specification tags in them, nor could have 6916 specification tags elsewhere pointing at them, can simply be 6917 processed and discarded. 6918 6919 This segment is also optional; scan_partial_symbols and 6920 add_partial_symbol will handle these DIEs if we chain 6921 them in normally. When compilers which do not emit large 6922 quantities of duplicate debug information are more common, 6923 this code can probably be removed. */ 6924 6925 /* Any complete simple types at the top level (pretty much all 6926 of them, for a language without namespaces), can be processed 6927 directly. */ 6928 if (parent_die == NULL 6929 && part_die->has_specification == 0 6930 && part_die->is_declaration == 0 6931 && (part_die->tag == DW_TAG_typedef 6932 || part_die->tag == DW_TAG_base_type 6933 || part_die->tag == DW_TAG_subrange_type)) 6934 { 6935 if (building_psymtab && part_die->name != NULL) 6936 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0, 6937 VAR_DOMAIN, LOC_TYPEDEF, 6938 &cu->objfile->static_psymbols, 6939 0, (CORE_ADDR) 0, cu->language, cu->objfile); 6940 info_ptr = locate_pdi_sibling (part_die, buffer, info_ptr, abfd, cu); 6941 continue; 6942 } 6943 6944 /* If we're at the second level, and we're an enumerator, and 6945 our parent has no specification (meaning possibly lives in a 6946 namespace elsewhere), then we can add the partial symbol now 6947 instead of queueing it. */ 6948 if (part_die->tag == DW_TAG_enumerator 6949 && parent_die != NULL 6950 && parent_die->die_parent == NULL 6951 && parent_die->tag == DW_TAG_enumeration_type 6952 && parent_die->has_specification == 0) 6953 { 6954 if (part_die->name == NULL) 6955 complaint (&symfile_complaints, _("malformed enumerator DIE ignored")); 6956 else if (building_psymtab) 6957 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0, 6958 VAR_DOMAIN, LOC_CONST, 6959 (cu->language == language_cplus 6960 || cu->language == language_java) 6961 ? &cu->objfile->global_psymbols 6962 : &cu->objfile->static_psymbols, 6963 0, (CORE_ADDR) 0, cu->language, cu->objfile); 6964 6965 info_ptr = locate_pdi_sibling (part_die, buffer, info_ptr, abfd, cu); 6966 continue; 6967 } 6968 6969 /* We'll save this DIE so link it in. */ 6970 part_die->die_parent = parent_die; 6971 part_die->die_sibling = NULL; 6972 part_die->die_child = NULL; 6973 6974 if (last_die && last_die == parent_die) 6975 last_die->die_child = part_die; 6976 else if (last_die) 6977 last_die->die_sibling = part_die; 6978 6979 last_die = part_die; 6980 6981 if (first_die == NULL) 6982 first_die = part_die; 6983 6984 /* Maybe add the DIE to the hash table. Not all DIEs that we 6985 find interesting need to be in the hash table, because we 6986 also have the parent/sibling/child chains; only those that we 6987 might refer to by offset later during partial symbol reading. 6988 6989 For now this means things that might have be the target of a 6990 DW_AT_specification, DW_AT_abstract_origin, or 6991 DW_AT_extension. DW_AT_extension will refer only to 6992 namespaces; DW_AT_abstract_origin refers to functions (and 6993 many things under the function DIE, but we do not recurse 6994 into function DIEs during partial symbol reading) and 6995 possibly variables as well; DW_AT_specification refers to 6996 declarations. Declarations ought to have the DW_AT_declaration 6997 flag. It happens that GCC forgets to put it in sometimes, but 6998 only for functions, not for types. 6999 7000 Adding more things than necessary to the hash table is harmless 7001 except for the performance cost. Adding too few will result in 7002 wasted time in find_partial_die, when we reread the compilation 7003 unit with load_all_dies set. */ 7004 7005 if (load_all 7006 || abbrev->tag == DW_TAG_subprogram 7007 || abbrev->tag == DW_TAG_variable 7008 || abbrev->tag == DW_TAG_namespace 7009 || part_die->is_declaration) 7010 { 7011 void **slot; 7012 7013 slot = htab_find_slot_with_hash (cu->partial_dies, part_die, 7014 part_die->offset, INSERT); 7015 *slot = part_die; 7016 } 7017 7018 part_die = obstack_alloc (&cu->comp_unit_obstack, 7019 sizeof (struct partial_die_info)); 7020 7021 /* For some DIEs we want to follow their children (if any). For C 7022 we have no reason to follow the children of structures; for other 7023 languages we have to, both so that we can get at method physnames 7024 to infer fully qualified class names, and for DW_AT_specification. 7025 7026 For Ada, we need to scan the children of subprograms and lexical 7027 blocks as well because Ada allows the definition of nested 7028 entities that could be interesting for the debugger, such as 7029 nested subprograms for instance. */ 7030 if (last_die->has_children 7031 && (load_all 7032 || last_die->tag == DW_TAG_namespace 7033 || last_die->tag == DW_TAG_module 7034 || last_die->tag == DW_TAG_enumeration_type 7035 || (cu->language != language_c 7036 && (last_die->tag == DW_TAG_class_type 7037 || last_die->tag == DW_TAG_interface_type 7038 || last_die->tag == DW_TAG_structure_type 7039 || last_die->tag == DW_TAG_union_type)) 7040 || (cu->language == language_ada 7041 && (last_die->tag == DW_TAG_subprogram 7042 || last_die->tag == DW_TAG_lexical_block)))) 7043 { 7044 nesting_level++; 7045 parent_die = last_die; 7046 continue; 7047 } 7048 7049 /* Otherwise we skip to the next sibling, if any. */ 7050 info_ptr = locate_pdi_sibling (last_die, buffer, info_ptr, abfd, cu); 7051 7052 /* Back to the top, do it again. */ 7053 } 7054 } 7055 7056 /* Read a minimal amount of information into the minimal die structure. */ 7057 7058 static gdb_byte * 7059 read_partial_die (struct partial_die_info *part_die, 7060 struct abbrev_info *abbrev, 7061 unsigned int abbrev_len, bfd *abfd, 7062 gdb_byte *buffer, gdb_byte *info_ptr, 7063 struct dwarf2_cu *cu) 7064 { 7065 unsigned int i; 7066 struct attribute attr; 7067 int has_low_pc_attr = 0; 7068 int has_high_pc_attr = 0; 7069 7070 memset (part_die, 0, sizeof (struct partial_die_info)); 7071 7072 part_die->offset = info_ptr - buffer; 7073 7074 info_ptr += abbrev_len; 7075 7076 if (abbrev == NULL) 7077 return info_ptr; 7078 7079 part_die->tag = abbrev->tag; 7080 part_die->has_children = abbrev->has_children; 7081 7082 for (i = 0; i < abbrev->num_attrs; ++i) 7083 { 7084 info_ptr = read_attribute (&attr, &abbrev->attrs[i], abfd, info_ptr, cu); 7085 7086 /* Store the data if it is of an attribute we want to keep in a 7087 partial symbol table. */ 7088 switch (attr.name) 7089 { 7090 case DW_AT_name: 7091 switch (part_die->tag) 7092 { 7093 case DW_TAG_compile_unit: 7094 case DW_TAG_type_unit: 7095 /* Compilation units have a DW_AT_name that is a filename, not 7096 a source language identifier. */ 7097 case DW_TAG_enumeration_type: 7098 case DW_TAG_enumerator: 7099 /* These tags always have simple identifiers already; no need 7100 to canonicalize them. */ 7101 part_die->name = DW_STRING (&attr); 7102 break; 7103 default: 7104 part_die->name 7105 = dwarf2_canonicalize_name (DW_STRING (&attr), cu, 7106 &cu->objfile->objfile_obstack); 7107 break; 7108 } 7109 break; 7110 case DW_AT_linkage_name: 7111 case DW_AT_MIPS_linkage_name: 7112 /* Note that both forms of linkage name might appear. We 7113 assume they will be the same, and we only store the last 7114 one we see. */ 7115 if (cu->language == language_ada) 7116 part_die->name = DW_STRING (&attr); 7117 break; 7118 case DW_AT_low_pc: 7119 has_low_pc_attr = 1; 7120 part_die->lowpc = DW_ADDR (&attr); 7121 break; 7122 case DW_AT_high_pc: 7123 has_high_pc_attr = 1; 7124 part_die->highpc = DW_ADDR (&attr); 7125 break; 7126 case DW_AT_location: 7127 /* Support the .debug_loc offsets */ 7128 if (attr_form_is_block (&attr)) 7129 { 7130 part_die->locdesc = DW_BLOCK (&attr); 7131 } 7132 else if (attr_form_is_section_offset (&attr)) 7133 { 7134 dwarf2_complex_location_expr_complaint (); 7135 } 7136 else 7137 { 7138 dwarf2_invalid_attrib_class_complaint ("DW_AT_location", 7139 "partial symbol information"); 7140 } 7141 break; 7142 case DW_AT_external: 7143 part_die->is_external = DW_UNSND (&attr); 7144 break; 7145 case DW_AT_declaration: 7146 part_die->is_declaration = DW_UNSND (&attr); 7147 break; 7148 case DW_AT_type: 7149 part_die->has_type = 1; 7150 break; 7151 case DW_AT_abstract_origin: 7152 case DW_AT_specification: 7153 case DW_AT_extension: 7154 part_die->has_specification = 1; 7155 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr); 7156 break; 7157 case DW_AT_sibling: 7158 /* Ignore absolute siblings, they might point outside of 7159 the current compile unit. */ 7160 if (attr.form == DW_FORM_ref_addr) 7161 complaint (&symfile_complaints, _("ignoring absolute DW_AT_sibling")); 7162 else 7163 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr); 7164 break; 7165 case DW_AT_byte_size: 7166 part_die->has_byte_size = 1; 7167 break; 7168 case DW_AT_calling_convention: 7169 /* DWARF doesn't provide a way to identify a program's source-level 7170 entry point. DW_AT_calling_convention attributes are only meant 7171 to describe functions' calling conventions. 7172 7173 However, because it's a necessary piece of information in 7174 Fortran, and because DW_CC_program is the only piece of debugging 7175 information whose definition refers to a 'main program' at all, 7176 several compilers have begun marking Fortran main programs with 7177 DW_CC_program --- even when those functions use the standard 7178 calling conventions. 7179 7180 So until DWARF specifies a way to provide this information and 7181 compilers pick up the new representation, we'll support this 7182 practice. */ 7183 if (DW_UNSND (&attr) == DW_CC_program 7184 && cu->language == language_fortran) 7185 set_main_name (part_die->name); 7186 break; 7187 default: 7188 break; 7189 } 7190 } 7191 7192 /* When using the GNU linker, .gnu.linkonce. sections are used to 7193 eliminate duplicate copies of functions and vtables and such. 7194 The linker will arbitrarily choose one and discard the others. 7195 The AT_*_pc values for such functions refer to local labels in 7196 these sections. If the section from that file was discarded, the 7197 labels are not in the output, so the relocs get a value of 0. 7198 If this is a discarded function, mark the pc bounds as invalid, 7199 so that GDB will ignore it. */ 7200 if (has_low_pc_attr && has_high_pc_attr 7201 && part_die->lowpc < part_die->highpc 7202 && (part_die->lowpc != 0 7203 || dwarf2_per_objfile->has_section_at_zero)) 7204 part_die->has_pc_info = 1; 7205 7206 return info_ptr; 7207 } 7208 7209 /* Find a cached partial DIE at OFFSET in CU. */ 7210 7211 static struct partial_die_info * 7212 find_partial_die_in_comp_unit (unsigned int offset, struct dwarf2_cu *cu) 7213 { 7214 struct partial_die_info *lookup_die = NULL; 7215 struct partial_die_info part_die; 7216 7217 part_die.offset = offset; 7218 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die, offset); 7219 7220 return lookup_die; 7221 } 7222 7223 /* Find a partial DIE at OFFSET, which may or may not be in CU, 7224 except in the case of .debug_types DIEs which do not reference 7225 outside their CU (they do however referencing other types via 7226 DW_FORM_sig8). */ 7227 7228 static struct partial_die_info * 7229 find_partial_die (unsigned int offset, struct dwarf2_cu *cu) 7230 { 7231 struct dwarf2_per_cu_data *per_cu = NULL; 7232 struct partial_die_info *pd = NULL; 7233 7234 if (cu->per_cu->from_debug_types) 7235 { 7236 pd = find_partial_die_in_comp_unit (offset, cu); 7237 if (pd != NULL) 7238 return pd; 7239 goto not_found; 7240 } 7241 7242 if (offset_in_cu_p (&cu->header, offset)) 7243 { 7244 pd = find_partial_die_in_comp_unit (offset, cu); 7245 if (pd != NULL) 7246 return pd; 7247 } 7248 7249 per_cu = dwarf2_find_containing_comp_unit (offset, cu->objfile); 7250 7251 if (per_cu->cu == NULL) 7252 { 7253 load_partial_comp_unit (per_cu, cu->objfile); 7254 per_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain; 7255 dwarf2_per_objfile->read_in_chain = per_cu; 7256 } 7257 7258 per_cu->cu->last_used = 0; 7259 pd = find_partial_die_in_comp_unit (offset, per_cu->cu); 7260 7261 if (pd == NULL && per_cu->load_all_dies == 0) 7262 { 7263 struct cleanup *back_to; 7264 struct partial_die_info comp_unit_die; 7265 struct abbrev_info *abbrev; 7266 unsigned int bytes_read; 7267 char *info_ptr; 7268 7269 per_cu->load_all_dies = 1; 7270 7271 /* Re-read the DIEs. */ 7272 back_to = make_cleanup (null_cleanup, 0); 7273 if (per_cu->cu->dwarf2_abbrevs == NULL) 7274 { 7275 dwarf2_read_abbrevs (per_cu->cu->objfile->obfd, per_cu->cu); 7276 make_cleanup (dwarf2_free_abbrev_table, per_cu->cu); 7277 } 7278 info_ptr = (dwarf2_per_objfile->info.buffer 7279 + per_cu->cu->header.offset 7280 + per_cu->cu->header.first_die_offset); 7281 abbrev = peek_die_abbrev (info_ptr, &bytes_read, per_cu->cu); 7282 info_ptr = read_partial_die (&comp_unit_die, abbrev, bytes_read, 7283 per_cu->cu->objfile->obfd, 7284 dwarf2_per_objfile->info.buffer, info_ptr, 7285 per_cu->cu); 7286 if (comp_unit_die.has_children) 7287 load_partial_dies (per_cu->cu->objfile->obfd, 7288 dwarf2_per_objfile->info.buffer, info_ptr, 7289 0, per_cu->cu); 7290 do_cleanups (back_to); 7291 7292 pd = find_partial_die_in_comp_unit (offset, per_cu->cu); 7293 } 7294 7295 not_found: 7296 7297 if (pd == NULL) 7298 internal_error (__FILE__, __LINE__, 7299 _("could not find partial DIE 0x%x in cache [from module %s]\n"), 7300 offset, bfd_get_filename (cu->objfile->obfd)); 7301 return pd; 7302 } 7303 7304 /* Adjust PART_DIE before generating a symbol for it. This function 7305 may set the is_external flag or change the DIE's name. */ 7306 7307 static void 7308 fixup_partial_die (struct partial_die_info *part_die, 7309 struct dwarf2_cu *cu) 7310 { 7311 /* If we found a reference attribute and the DIE has no name, try 7312 to find a name in the referred to DIE. */ 7313 7314 if (part_die->name == NULL && part_die->has_specification) 7315 { 7316 struct partial_die_info *spec_die; 7317 7318 spec_die = find_partial_die (part_die->spec_offset, cu); 7319 7320 fixup_partial_die (spec_die, cu); 7321 7322 if (spec_die->name) 7323 { 7324 part_die->name = spec_die->name; 7325 7326 /* Copy DW_AT_external attribute if it is set. */ 7327 if (spec_die->is_external) 7328 part_die->is_external = spec_die->is_external; 7329 } 7330 } 7331 7332 /* Set default names for some unnamed DIEs. */ 7333 if (part_die->name == NULL && (part_die->tag == DW_TAG_structure_type 7334 || part_die->tag == DW_TAG_class_type)) 7335 part_die->name = "(anonymous class)"; 7336 7337 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace) 7338 part_die->name = "(anonymous namespace)"; 7339 7340 if (part_die->tag == DW_TAG_structure_type 7341 || part_die->tag == DW_TAG_class_type 7342 || part_die->tag == DW_TAG_union_type) 7343 guess_structure_name (part_die, cu); 7344 } 7345 7346 /* Read an attribute value described by an attribute form. */ 7347 7348 static gdb_byte * 7349 read_attribute_value (struct attribute *attr, unsigned form, 7350 bfd *abfd, gdb_byte *info_ptr, 7351 struct dwarf2_cu *cu) 7352 { 7353 struct comp_unit_head *cu_header = &cu->header; 7354 unsigned int bytes_read; 7355 struct dwarf_block *blk; 7356 7357 attr->form = form; 7358 switch (form) 7359 { 7360 case DW_FORM_ref_addr: 7361 if (cu->header.version == 2) 7362 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read); 7363 else 7364 DW_ADDR (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read); 7365 info_ptr += bytes_read; 7366 break; 7367 case DW_FORM_addr: 7368 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read); 7369 info_ptr += bytes_read; 7370 break; 7371 case DW_FORM_block2: 7372 blk = dwarf_alloc_block (cu); 7373 blk->size = read_2_bytes (abfd, info_ptr); 7374 info_ptr += 2; 7375 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 7376 info_ptr += blk->size; 7377 DW_BLOCK (attr) = blk; 7378 break; 7379 case DW_FORM_block4: 7380 blk = dwarf_alloc_block (cu); 7381 blk->size = read_4_bytes (abfd, info_ptr); 7382 info_ptr += 4; 7383 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 7384 info_ptr += blk->size; 7385 DW_BLOCK (attr) = blk; 7386 break; 7387 case DW_FORM_data2: 7388 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr); 7389 info_ptr += 2; 7390 break; 7391 case DW_FORM_data4: 7392 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr); 7393 info_ptr += 4; 7394 break; 7395 case DW_FORM_data8: 7396 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr); 7397 info_ptr += 8; 7398 break; 7399 case DW_FORM_sec_offset: 7400 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read); 7401 info_ptr += bytes_read; 7402 break; 7403 case DW_FORM_string: 7404 DW_STRING (attr) = read_string (abfd, info_ptr, &bytes_read); 7405 DW_STRING_IS_CANONICAL (attr) = 0; 7406 info_ptr += bytes_read; 7407 break; 7408 case DW_FORM_strp: 7409 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header, 7410 &bytes_read); 7411 DW_STRING_IS_CANONICAL (attr) = 0; 7412 info_ptr += bytes_read; 7413 break; 7414 case DW_FORM_exprloc: 7415 case DW_FORM_block: 7416 blk = dwarf_alloc_block (cu); 7417 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 7418 info_ptr += bytes_read; 7419 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 7420 info_ptr += blk->size; 7421 DW_BLOCK (attr) = blk; 7422 break; 7423 case DW_FORM_block1: 7424 blk = dwarf_alloc_block (cu); 7425 blk->size = read_1_byte (abfd, info_ptr); 7426 info_ptr += 1; 7427 blk->data = read_n_bytes (abfd, info_ptr, blk->size); 7428 info_ptr += blk->size; 7429 DW_BLOCK (attr) = blk; 7430 break; 7431 case DW_FORM_data1: 7432 DW_UNSND (attr) = read_1_byte (abfd, info_ptr); 7433 info_ptr += 1; 7434 break; 7435 case DW_FORM_flag: 7436 DW_UNSND (attr) = read_1_byte (abfd, info_ptr); 7437 info_ptr += 1; 7438 break; 7439 case DW_FORM_flag_present: 7440 DW_UNSND (attr) = 1; 7441 break; 7442 case DW_FORM_sdata: 7443 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read); 7444 info_ptr += bytes_read; 7445 break; 7446 case DW_FORM_udata: 7447 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 7448 info_ptr += bytes_read; 7449 break; 7450 case DW_FORM_ref1: 7451 DW_ADDR (attr) = cu->header.offset + read_1_byte (abfd, info_ptr); 7452 info_ptr += 1; 7453 break; 7454 case DW_FORM_ref2: 7455 DW_ADDR (attr) = cu->header.offset + read_2_bytes (abfd, info_ptr); 7456 info_ptr += 2; 7457 break; 7458 case DW_FORM_ref4: 7459 DW_ADDR (attr) = cu->header.offset + read_4_bytes (abfd, info_ptr); 7460 info_ptr += 4; 7461 break; 7462 case DW_FORM_ref8: 7463 DW_ADDR (attr) = cu->header.offset + read_8_bytes (abfd, info_ptr); 7464 info_ptr += 8; 7465 break; 7466 case DW_FORM_sig8: 7467 /* Convert the signature to something we can record in DW_UNSND 7468 for later lookup. 7469 NOTE: This is NULL if the type wasn't found. */ 7470 DW_SIGNATURED_TYPE (attr) = 7471 lookup_signatured_type (cu->objfile, read_8_bytes (abfd, info_ptr)); 7472 info_ptr += 8; 7473 break; 7474 case DW_FORM_ref_udata: 7475 DW_ADDR (attr) = (cu->header.offset 7476 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read)); 7477 info_ptr += bytes_read; 7478 break; 7479 case DW_FORM_indirect: 7480 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); 7481 info_ptr += bytes_read; 7482 info_ptr = read_attribute_value (attr, form, abfd, info_ptr, cu); 7483 break; 7484 default: 7485 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"), 7486 dwarf_form_name (form), 7487 bfd_get_filename (abfd)); 7488 } 7489 7490 /* We have seen instances where the compiler tried to emit a byte 7491 size attribute of -1 which ended up being encoded as an unsigned 7492 0xffffffff. Although 0xffffffff is technically a valid size value, 7493 an object of this size seems pretty unlikely so we can relatively 7494 safely treat these cases as if the size attribute was invalid and 7495 treat them as zero by default. */ 7496 if (attr->name == DW_AT_byte_size 7497 && form == DW_FORM_data4 7498 && DW_UNSND (attr) >= 0xffffffff) 7499 { 7500 complaint 7501 (&symfile_complaints, 7502 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"), 7503 hex_string (DW_UNSND (attr))); 7504 DW_UNSND (attr) = 0; 7505 } 7506 7507 return info_ptr; 7508 } 7509 7510 /* Read an attribute described by an abbreviated attribute. */ 7511 7512 static gdb_byte * 7513 read_attribute (struct attribute *attr, struct attr_abbrev *abbrev, 7514 bfd *abfd, gdb_byte *info_ptr, struct dwarf2_cu *cu) 7515 { 7516 attr->name = abbrev->name; 7517 return read_attribute_value (attr, abbrev->form, abfd, info_ptr, cu); 7518 } 7519 7520 /* read dwarf information from a buffer */ 7521 7522 static unsigned int 7523 read_1_byte (bfd *abfd, gdb_byte *buf) 7524 { 7525 return bfd_get_8 (abfd, buf); 7526 } 7527 7528 static int 7529 read_1_signed_byte (bfd *abfd, gdb_byte *buf) 7530 { 7531 return bfd_get_signed_8 (abfd, buf); 7532 } 7533 7534 static unsigned int 7535 read_2_bytes (bfd *abfd, gdb_byte *buf) 7536 { 7537 return bfd_get_16 (abfd, buf); 7538 } 7539 7540 static int 7541 read_2_signed_bytes (bfd *abfd, gdb_byte *buf) 7542 { 7543 return bfd_get_signed_16 (abfd, buf); 7544 } 7545 7546 static unsigned int 7547 read_4_bytes (bfd *abfd, gdb_byte *buf) 7548 { 7549 return bfd_get_32 (abfd, buf); 7550 } 7551 7552 static int 7553 read_4_signed_bytes (bfd *abfd, gdb_byte *buf) 7554 { 7555 return bfd_get_signed_32 (abfd, buf); 7556 } 7557 7558 static ULONGEST 7559 read_8_bytes (bfd *abfd, gdb_byte *buf) 7560 { 7561 return bfd_get_64 (abfd, buf); 7562 } 7563 7564 static CORE_ADDR 7565 read_address (bfd *abfd, gdb_byte *buf, struct dwarf2_cu *cu, 7566 unsigned int *bytes_read) 7567 { 7568 struct comp_unit_head *cu_header = &cu->header; 7569 CORE_ADDR retval = 0; 7570 7571 if (cu_header->signed_addr_p) 7572 { 7573 switch (cu_header->addr_size) 7574 { 7575 case 2: 7576 retval = bfd_get_signed_16 (abfd, buf); 7577 break; 7578 case 4: 7579 retval = bfd_get_signed_32 (abfd, buf); 7580 break; 7581 case 8: 7582 retval = bfd_get_signed_64 (abfd, buf); 7583 break; 7584 default: 7585 internal_error (__FILE__, __LINE__, 7586 _("read_address: bad switch, signed [in module %s]"), 7587 bfd_get_filename (abfd)); 7588 } 7589 } 7590 else 7591 { 7592 switch (cu_header->addr_size) 7593 { 7594 case 2: 7595 retval = bfd_get_16 (abfd, buf); 7596 break; 7597 case 4: 7598 retval = bfd_get_32 (abfd, buf); 7599 break; 7600 case 8: 7601 retval = bfd_get_64 (abfd, buf); 7602 break; 7603 default: 7604 internal_error (__FILE__, __LINE__, 7605 _("read_address: bad switch, unsigned [in module %s]"), 7606 bfd_get_filename (abfd)); 7607 } 7608 } 7609 7610 *bytes_read = cu_header->addr_size; 7611 return retval; 7612 } 7613 7614 /* Read the initial length from a section. The (draft) DWARF 3 7615 specification allows the initial length to take up either 4 bytes 7616 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8 7617 bytes describe the length and all offsets will be 8 bytes in length 7618 instead of 4. 7619 7620 An older, non-standard 64-bit format is also handled by this 7621 function. The older format in question stores the initial length 7622 as an 8-byte quantity without an escape value. Lengths greater 7623 than 2^32 aren't very common which means that the initial 4 bytes 7624 is almost always zero. Since a length value of zero doesn't make 7625 sense for the 32-bit format, this initial zero can be considered to 7626 be an escape value which indicates the presence of the older 64-bit 7627 format. As written, the code can't detect (old format) lengths 7628 greater than 4GB. If it becomes necessary to handle lengths 7629 somewhat larger than 4GB, we could allow other small values (such 7630 as the non-sensical values of 1, 2, and 3) to also be used as 7631 escape values indicating the presence of the old format. 7632 7633 The value returned via bytes_read should be used to increment the 7634 relevant pointer after calling read_initial_length(). 7635 7636 [ Note: read_initial_length() and read_offset() are based on the 7637 document entitled "DWARF Debugging Information Format", revision 7638 3, draft 8, dated November 19, 2001. This document was obtained 7639 from: 7640 7641 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf 7642 7643 This document is only a draft and is subject to change. (So beware.) 7644 7645 Details regarding the older, non-standard 64-bit format were 7646 determined empirically by examining 64-bit ELF files produced by 7647 the SGI toolchain on an IRIX 6.5 machine. 7648 7649 - Kevin, July 16, 2002 7650 ] */ 7651 7652 static LONGEST 7653 read_initial_length (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read) 7654 { 7655 LONGEST length = bfd_get_32 (abfd, buf); 7656 7657 if (length == 0xffffffff) 7658 { 7659 length = bfd_get_64 (abfd, buf + 4); 7660 *bytes_read = 12; 7661 } 7662 else if (length == 0) 7663 { 7664 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */ 7665 length = bfd_get_64 (abfd, buf); 7666 *bytes_read = 8; 7667 } 7668 else 7669 { 7670 *bytes_read = 4; 7671 } 7672 7673 return length; 7674 } 7675 7676 /* Cover function for read_initial_length. 7677 Returns the length of the object at BUF, and stores the size of the 7678 initial length in *BYTES_READ and stores the size that offsets will be in 7679 *OFFSET_SIZE. 7680 If the initial length size is not equivalent to that specified in 7681 CU_HEADER then issue a complaint. 7682 This is useful when reading non-comp-unit headers. */ 7683 7684 static LONGEST 7685 read_checked_initial_length_and_offset (bfd *abfd, gdb_byte *buf, 7686 const struct comp_unit_head *cu_header, 7687 unsigned int *bytes_read, 7688 unsigned int *offset_size) 7689 { 7690 LONGEST length = read_initial_length (abfd, buf, bytes_read); 7691 7692 gdb_assert (cu_header->initial_length_size == 4 7693 || cu_header->initial_length_size == 8 7694 || cu_header->initial_length_size == 12); 7695 7696 if (cu_header->initial_length_size != *bytes_read) 7697 complaint (&symfile_complaints, 7698 _("intermixed 32-bit and 64-bit DWARF sections")); 7699 7700 *offset_size = (*bytes_read == 4) ? 4 : 8; 7701 return length; 7702 } 7703 7704 /* Read an offset from the data stream. The size of the offset is 7705 given by cu_header->offset_size. */ 7706 7707 static LONGEST 7708 read_offset (bfd *abfd, gdb_byte *buf, const struct comp_unit_head *cu_header, 7709 unsigned int *bytes_read) 7710 { 7711 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size); 7712 7713 *bytes_read = cu_header->offset_size; 7714 return offset; 7715 } 7716 7717 /* Read an offset from the data stream. */ 7718 7719 static LONGEST 7720 read_offset_1 (bfd *abfd, gdb_byte *buf, unsigned int offset_size) 7721 { 7722 LONGEST retval = 0; 7723 7724 switch (offset_size) 7725 { 7726 case 4: 7727 retval = bfd_get_32 (abfd, buf); 7728 break; 7729 case 8: 7730 retval = bfd_get_64 (abfd, buf); 7731 break; 7732 default: 7733 internal_error (__FILE__, __LINE__, 7734 _("read_offset_1: bad switch [in module %s]"), 7735 bfd_get_filename (abfd)); 7736 } 7737 7738 return retval; 7739 } 7740 7741 static gdb_byte * 7742 read_n_bytes (bfd *abfd, gdb_byte *buf, unsigned int size) 7743 { 7744 /* If the size of a host char is 8 bits, we can return a pointer 7745 to the buffer, otherwise we have to copy the data to a buffer 7746 allocated on the temporary obstack. */ 7747 gdb_assert (HOST_CHAR_BIT == 8); 7748 return buf; 7749 } 7750 7751 static char * 7752 read_string (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr) 7753 { 7754 /* If the size of a host char is 8 bits, we can return a pointer 7755 to the string, otherwise we have to copy the string to a buffer 7756 allocated on the temporary obstack. */ 7757 gdb_assert (HOST_CHAR_BIT == 8); 7758 if (*buf == '\0') 7759 { 7760 *bytes_read_ptr = 1; 7761 return NULL; 7762 } 7763 *bytes_read_ptr = strlen ((char *) buf) + 1; 7764 return (char *) buf; 7765 } 7766 7767 static char * 7768 read_indirect_string (bfd *abfd, gdb_byte *buf, 7769 const struct comp_unit_head *cu_header, 7770 unsigned int *bytes_read_ptr) 7771 { 7772 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr); 7773 7774 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str); 7775 if (dwarf2_per_objfile->str.buffer == NULL) 7776 { 7777 error (_("DW_FORM_strp used without .debug_str section [in module %s]"), 7778 bfd_get_filename (abfd)); 7779 return NULL; 7780 } 7781 if (str_offset >= dwarf2_per_objfile->str.size) 7782 { 7783 error (_("DW_FORM_strp pointing outside of .debug_str section [in module %s]"), 7784 bfd_get_filename (abfd)); 7785 return NULL; 7786 } 7787 gdb_assert (HOST_CHAR_BIT == 8); 7788 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0') 7789 return NULL; 7790 return (char *) (dwarf2_per_objfile->str.buffer + str_offset); 7791 } 7792 7793 static unsigned long 7794 read_unsigned_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr) 7795 { 7796 unsigned long result; 7797 unsigned int num_read; 7798 int i, shift; 7799 unsigned char byte; 7800 7801 result = 0; 7802 shift = 0; 7803 num_read = 0; 7804 i = 0; 7805 while (1) 7806 { 7807 byte = bfd_get_8 (abfd, buf); 7808 buf++; 7809 num_read++; 7810 result |= ((unsigned long)(byte & 127) << shift); 7811 if ((byte & 128) == 0) 7812 { 7813 break; 7814 } 7815 shift += 7; 7816 } 7817 *bytes_read_ptr = num_read; 7818 return result; 7819 } 7820 7821 static long 7822 read_signed_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr) 7823 { 7824 long result; 7825 int i, shift, num_read; 7826 unsigned char byte; 7827 7828 result = 0; 7829 shift = 0; 7830 num_read = 0; 7831 i = 0; 7832 while (1) 7833 { 7834 byte = bfd_get_8 (abfd, buf); 7835 buf++; 7836 num_read++; 7837 result |= ((long)(byte & 127) << shift); 7838 shift += 7; 7839 if ((byte & 128) == 0) 7840 { 7841 break; 7842 } 7843 } 7844 if ((shift < 8 * sizeof (result)) && (byte & 0x40)) 7845 result |= -(((long)1) << shift); 7846 *bytes_read_ptr = num_read; 7847 return result; 7848 } 7849 7850 /* Return a pointer to just past the end of an LEB128 number in BUF. */ 7851 7852 static gdb_byte * 7853 skip_leb128 (bfd *abfd, gdb_byte *buf) 7854 { 7855 int byte; 7856 7857 while (1) 7858 { 7859 byte = bfd_get_8 (abfd, buf); 7860 buf++; 7861 if ((byte & 128) == 0) 7862 return buf; 7863 } 7864 } 7865 7866 static void 7867 set_cu_language (unsigned int lang, struct dwarf2_cu *cu) 7868 { 7869 switch (lang) 7870 { 7871 case DW_LANG_C89: 7872 case DW_LANG_C99: 7873 case DW_LANG_C: 7874 cu->language = language_c; 7875 break; 7876 case DW_LANG_C_plus_plus: 7877 cu->language = language_cplus; 7878 break; 7879 case DW_LANG_D: 7880 cu->language = language_d; 7881 break; 7882 case DW_LANG_Fortran77: 7883 case DW_LANG_Fortran90: 7884 case DW_LANG_Fortran95: 7885 cu->language = language_fortran; 7886 break; 7887 case DW_LANG_Mips_Assembler: 7888 cu->language = language_asm; 7889 break; 7890 case DW_LANG_Java: 7891 cu->language = language_java; 7892 break; 7893 case DW_LANG_Ada83: 7894 case DW_LANG_Ada95: 7895 cu->language = language_ada; 7896 break; 7897 case DW_LANG_Modula2: 7898 cu->language = language_m2; 7899 break; 7900 case DW_LANG_Pascal83: 7901 cu->language = language_pascal; 7902 break; 7903 case DW_LANG_ObjC: 7904 cu->language = language_objc; 7905 break; 7906 case DW_LANG_Cobol74: 7907 case DW_LANG_Cobol85: 7908 default: 7909 cu->language = language_minimal; 7910 break; 7911 } 7912 cu->language_defn = language_def (cu->language); 7913 } 7914 7915 /* Return the named attribute or NULL if not there. */ 7916 7917 static struct attribute * 7918 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu) 7919 { 7920 unsigned int i; 7921 struct attribute *spec = NULL; 7922 7923 for (i = 0; i < die->num_attrs; ++i) 7924 { 7925 if (die->attrs[i].name == name) 7926 return &die->attrs[i]; 7927 if (die->attrs[i].name == DW_AT_specification 7928 || die->attrs[i].name == DW_AT_abstract_origin) 7929 spec = &die->attrs[i]; 7930 } 7931 7932 if (spec) 7933 { 7934 die = follow_die_ref (die, spec, &cu); 7935 return dwarf2_attr (die, name, cu); 7936 } 7937 7938 return NULL; 7939 } 7940 7941 /* Return the named attribute or NULL if not there, 7942 but do not follow DW_AT_specification, etc. 7943 This is for use in contexts where we're reading .debug_types dies. 7944 Following DW_AT_specification, DW_AT_abstract_origin will take us 7945 back up the chain, and we want to go down. */ 7946 7947 static struct attribute * 7948 dwarf2_attr_no_follow (struct die_info *die, unsigned int name, 7949 struct dwarf2_cu *cu) 7950 { 7951 unsigned int i; 7952 7953 for (i = 0; i < die->num_attrs; ++i) 7954 if (die->attrs[i].name == name) 7955 return &die->attrs[i]; 7956 7957 return NULL; 7958 } 7959 7960 /* Return non-zero iff the attribute NAME is defined for the given DIE, 7961 and holds a non-zero value. This function should only be used for 7962 DW_FORM_flag or DW_FORM_flag_present attributes. */ 7963 7964 static int 7965 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu) 7966 { 7967 struct attribute *attr = dwarf2_attr (die, name, cu); 7968 7969 return (attr && DW_UNSND (attr)); 7970 } 7971 7972 static int 7973 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu) 7974 { 7975 /* A DIE is a declaration if it has a DW_AT_declaration attribute 7976 which value is non-zero. However, we have to be careful with 7977 DIEs having a DW_AT_specification attribute, because dwarf2_attr() 7978 (via dwarf2_flag_true_p) follows this attribute. So we may 7979 end up accidently finding a declaration attribute that belongs 7980 to a different DIE referenced by the specification attribute, 7981 even though the given DIE does not have a declaration attribute. */ 7982 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu) 7983 && dwarf2_attr (die, DW_AT_specification, cu) == NULL); 7984 } 7985 7986 /* Return the die giving the specification for DIE, if there is 7987 one. *SPEC_CU is the CU containing DIE on input, and the CU 7988 containing the return value on output. If there is no 7989 specification, but there is an abstract origin, that is 7990 returned. */ 7991 7992 static struct die_info * 7993 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu) 7994 { 7995 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification, 7996 *spec_cu); 7997 7998 if (spec_attr == NULL) 7999 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu); 8000 8001 if (spec_attr == NULL) 8002 return NULL; 8003 else 8004 return follow_die_ref (die, spec_attr, spec_cu); 8005 } 8006 8007 /* Free the line_header structure *LH, and any arrays and strings it 8008 refers to. */ 8009 static void 8010 free_line_header (struct line_header *lh) 8011 { 8012 if (lh->standard_opcode_lengths) 8013 xfree (lh->standard_opcode_lengths); 8014 8015 /* Remember that all the lh->file_names[i].name pointers are 8016 pointers into debug_line_buffer, and don't need to be freed. */ 8017 if (lh->file_names) 8018 xfree (lh->file_names); 8019 8020 /* Similarly for the include directory names. */ 8021 if (lh->include_dirs) 8022 xfree (lh->include_dirs); 8023 8024 xfree (lh); 8025 } 8026 8027 8028 /* Add an entry to LH's include directory table. */ 8029 static void 8030 add_include_dir (struct line_header *lh, char *include_dir) 8031 { 8032 /* Grow the array if necessary. */ 8033 if (lh->include_dirs_size == 0) 8034 { 8035 lh->include_dirs_size = 1; /* for testing */ 8036 lh->include_dirs = xmalloc (lh->include_dirs_size 8037 * sizeof (*lh->include_dirs)); 8038 } 8039 else if (lh->num_include_dirs >= lh->include_dirs_size) 8040 { 8041 lh->include_dirs_size *= 2; 8042 lh->include_dirs = xrealloc (lh->include_dirs, 8043 (lh->include_dirs_size 8044 * sizeof (*lh->include_dirs))); 8045 } 8046 8047 lh->include_dirs[lh->num_include_dirs++] = include_dir; 8048 } 8049 8050 8051 /* Add an entry to LH's file name table. */ 8052 static void 8053 add_file_name (struct line_header *lh, 8054 char *name, 8055 unsigned int dir_index, 8056 unsigned int mod_time, 8057 unsigned int length) 8058 { 8059 struct file_entry *fe; 8060 8061 /* Grow the array if necessary. */ 8062 if (lh->file_names_size == 0) 8063 { 8064 lh->file_names_size = 1; /* for testing */ 8065 lh->file_names = xmalloc (lh->file_names_size 8066 * sizeof (*lh->file_names)); 8067 } 8068 else if (lh->num_file_names >= lh->file_names_size) 8069 { 8070 lh->file_names_size *= 2; 8071 lh->file_names = xrealloc (lh->file_names, 8072 (lh->file_names_size 8073 * sizeof (*lh->file_names))); 8074 } 8075 8076 fe = &lh->file_names[lh->num_file_names++]; 8077 fe->name = name; 8078 fe->dir_index = dir_index; 8079 fe->mod_time = mod_time; 8080 fe->length = length; 8081 fe->included_p = 0; 8082 fe->symtab = NULL; 8083 } 8084 8085 8086 /* Read the statement program header starting at OFFSET in 8087 .debug_line, according to the endianness of ABFD. Return a pointer 8088 to a struct line_header, allocated using xmalloc. 8089 8090 NOTE: the strings in the include directory and file name tables of 8091 the returned object point into debug_line_buffer, and must not be 8092 freed. */ 8093 static struct line_header * 8094 dwarf_decode_line_header (unsigned int offset, bfd *abfd, 8095 struct dwarf2_cu *cu) 8096 { 8097 struct cleanup *back_to; 8098 struct line_header *lh; 8099 gdb_byte *line_ptr; 8100 unsigned int bytes_read, offset_size; 8101 int i; 8102 char *cur_dir, *cur_file; 8103 8104 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->line); 8105 if (dwarf2_per_objfile->line.buffer == NULL) 8106 { 8107 complaint (&symfile_complaints, _("missing .debug_line section")); 8108 return 0; 8109 } 8110 8111 /* Make sure that at least there's room for the total_length field. 8112 That could be 12 bytes long, but we're just going to fudge that. */ 8113 if (offset + 4 >= dwarf2_per_objfile->line.size) 8114 { 8115 dwarf2_statement_list_fits_in_line_number_section_complaint (); 8116 return 0; 8117 } 8118 8119 lh = xmalloc (sizeof (*lh)); 8120 memset (lh, 0, sizeof (*lh)); 8121 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header, 8122 (void *) lh); 8123 8124 line_ptr = dwarf2_per_objfile->line.buffer + offset; 8125 8126 /* Read in the header. */ 8127 lh->total_length = 8128 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header, 8129 &bytes_read, &offset_size); 8130 line_ptr += bytes_read; 8131 if (line_ptr + lh->total_length > (dwarf2_per_objfile->line.buffer 8132 + dwarf2_per_objfile->line.size)) 8133 { 8134 dwarf2_statement_list_fits_in_line_number_section_complaint (); 8135 return 0; 8136 } 8137 lh->statement_program_end = line_ptr + lh->total_length; 8138 lh->version = read_2_bytes (abfd, line_ptr); 8139 line_ptr += 2; 8140 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size); 8141 line_ptr += offset_size; 8142 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr); 8143 line_ptr += 1; 8144 if (lh->version >= 4) 8145 { 8146 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr); 8147 line_ptr += 1; 8148 } 8149 else 8150 lh->maximum_ops_per_instruction = 1; 8151 8152 if (lh->maximum_ops_per_instruction == 0) 8153 { 8154 lh->maximum_ops_per_instruction = 1; 8155 complaint (&symfile_complaints, 8156 _("invalid maximum_ops_per_instruction in `.debug_line' section")); 8157 } 8158 8159 lh->default_is_stmt = read_1_byte (abfd, line_ptr); 8160 line_ptr += 1; 8161 lh->line_base = read_1_signed_byte (abfd, line_ptr); 8162 line_ptr += 1; 8163 lh->line_range = read_1_byte (abfd, line_ptr); 8164 line_ptr += 1; 8165 lh->opcode_base = read_1_byte (abfd, line_ptr); 8166 line_ptr += 1; 8167 lh->standard_opcode_lengths 8168 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0])); 8169 8170 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */ 8171 for (i = 1; i < lh->opcode_base; ++i) 8172 { 8173 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr); 8174 line_ptr += 1; 8175 } 8176 8177 /* Read directory table. */ 8178 while ((cur_dir = read_string (abfd, line_ptr, &bytes_read)) != NULL) 8179 { 8180 line_ptr += bytes_read; 8181 add_include_dir (lh, cur_dir); 8182 } 8183 line_ptr += bytes_read; 8184 8185 /* Read file name table. */ 8186 while ((cur_file = read_string (abfd, line_ptr, &bytes_read)) != NULL) 8187 { 8188 unsigned int dir_index, mod_time, length; 8189 8190 line_ptr += bytes_read; 8191 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8192 line_ptr += bytes_read; 8193 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8194 line_ptr += bytes_read; 8195 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8196 line_ptr += bytes_read; 8197 8198 add_file_name (lh, cur_file, dir_index, mod_time, length); 8199 } 8200 line_ptr += bytes_read; 8201 lh->statement_program_start = line_ptr; 8202 8203 if (line_ptr > (dwarf2_per_objfile->line.buffer 8204 + dwarf2_per_objfile->line.size)) 8205 complaint (&symfile_complaints, 8206 _("line number info header doesn't fit in `.debug_line' section")); 8207 8208 discard_cleanups (back_to); 8209 return lh; 8210 } 8211 8212 /* This function exists to work around a bug in certain compilers 8213 (particularly GCC 2.95), in which the first line number marker of a 8214 function does not show up until after the prologue, right before 8215 the second line number marker. This function shifts ADDRESS down 8216 to the beginning of the function if necessary, and is called on 8217 addresses passed to record_line. */ 8218 8219 static CORE_ADDR 8220 check_cu_functions (CORE_ADDR address, struct dwarf2_cu *cu) 8221 { 8222 struct function_range *fn; 8223 8224 /* Find the function_range containing address. */ 8225 if (!cu->first_fn) 8226 return address; 8227 8228 if (!cu->cached_fn) 8229 cu->cached_fn = cu->first_fn; 8230 8231 fn = cu->cached_fn; 8232 while (fn) 8233 if (fn->lowpc <= address && fn->highpc > address) 8234 goto found; 8235 else 8236 fn = fn->next; 8237 8238 fn = cu->first_fn; 8239 while (fn && fn != cu->cached_fn) 8240 if (fn->lowpc <= address && fn->highpc > address) 8241 goto found; 8242 else 8243 fn = fn->next; 8244 8245 return address; 8246 8247 found: 8248 if (fn->seen_line) 8249 return address; 8250 if (address != fn->lowpc) 8251 complaint (&symfile_complaints, 8252 _("misplaced first line number at 0x%lx for '%s'"), 8253 (unsigned long) address, fn->name); 8254 fn->seen_line = 1; 8255 return fn->lowpc; 8256 } 8257 8258 /* Decode the Line Number Program (LNP) for the given line_header 8259 structure and CU. The actual information extracted and the type 8260 of structures created from the LNP depends on the value of PST. 8261 8262 1. If PST is NULL, then this procedure uses the data from the program 8263 to create all necessary symbol tables, and their linetables. 8264 The compilation directory of the file is passed in COMP_DIR, 8265 and must not be NULL. 8266 8267 2. If PST is not NULL, this procedure reads the program to determine 8268 the list of files included by the unit represented by PST, and 8269 builds all the associated partial symbol tables. In this case, 8270 the value of COMP_DIR is ignored, and can thus be NULL (the COMP_DIR 8271 is not used to compute the full name of the symtab, and therefore 8272 omitting it when building the partial symtab does not introduce 8273 the potential for inconsistency - a partial symtab and its associated 8274 symbtab having a different fullname -). */ 8275 8276 static void 8277 dwarf_decode_lines (struct line_header *lh, char *comp_dir, bfd *abfd, 8278 struct dwarf2_cu *cu, struct partial_symtab *pst) 8279 { 8280 gdb_byte *line_ptr, *extended_end; 8281 gdb_byte *line_end; 8282 unsigned int bytes_read, extended_len; 8283 unsigned char op_code, extended_op, adj_opcode; 8284 CORE_ADDR baseaddr; 8285 struct objfile *objfile = cu->objfile; 8286 struct gdbarch *gdbarch = get_objfile_arch (objfile); 8287 const int decode_for_pst_p = (pst != NULL); 8288 struct subfile *last_subfile = NULL, *first_subfile = current_subfile; 8289 8290 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 8291 8292 line_ptr = lh->statement_program_start; 8293 line_end = lh->statement_program_end; 8294 8295 /* Read the statement sequences until there's nothing left. */ 8296 while (line_ptr < line_end) 8297 { 8298 /* state machine registers */ 8299 CORE_ADDR address = 0; 8300 unsigned int file = 1; 8301 unsigned int line = 1; 8302 unsigned int column = 0; 8303 int is_stmt = lh->default_is_stmt; 8304 int basic_block = 0; 8305 int end_sequence = 0; 8306 CORE_ADDR addr; 8307 unsigned char op_index = 0; 8308 8309 if (!decode_for_pst_p && lh->num_file_names >= file) 8310 { 8311 /* Start a subfile for the current file of the state machine. */ 8312 /* lh->include_dirs and lh->file_names are 0-based, but the 8313 directory and file name numbers in the statement program 8314 are 1-based. */ 8315 struct file_entry *fe = &lh->file_names[file - 1]; 8316 char *dir = NULL; 8317 8318 if (fe->dir_index) 8319 dir = lh->include_dirs[fe->dir_index - 1]; 8320 8321 dwarf2_start_subfile (fe->name, dir, comp_dir); 8322 } 8323 8324 /* Decode the table. */ 8325 while (!end_sequence) 8326 { 8327 op_code = read_1_byte (abfd, line_ptr); 8328 line_ptr += 1; 8329 if (line_ptr > line_end) 8330 { 8331 dwarf2_debug_line_missing_end_sequence_complaint (); 8332 break; 8333 } 8334 8335 if (op_code >= lh->opcode_base) 8336 { 8337 /* Special operand. */ 8338 adj_opcode = op_code - lh->opcode_base; 8339 address += (((op_index + (adj_opcode / lh->line_range)) 8340 / lh->maximum_ops_per_instruction) 8341 * lh->minimum_instruction_length); 8342 op_index = ((op_index + (adj_opcode / lh->line_range)) 8343 % lh->maximum_ops_per_instruction); 8344 line += lh->line_base + (adj_opcode % lh->line_range); 8345 if (lh->num_file_names < file || file == 0) 8346 dwarf2_debug_line_missing_file_complaint (); 8347 /* For now we ignore lines not starting on an 8348 instruction boundary. */ 8349 else if (op_index == 0) 8350 { 8351 lh->file_names[file - 1].included_p = 1; 8352 if (!decode_for_pst_p && is_stmt) 8353 { 8354 if (last_subfile != current_subfile) 8355 { 8356 addr = gdbarch_addr_bits_remove (gdbarch, address); 8357 if (last_subfile) 8358 record_line (last_subfile, 0, addr); 8359 last_subfile = current_subfile; 8360 } 8361 /* Append row to matrix using current values. */ 8362 addr = check_cu_functions (address, cu); 8363 addr = gdbarch_addr_bits_remove (gdbarch, addr); 8364 record_line (current_subfile, line, addr); 8365 } 8366 } 8367 basic_block = 0; 8368 } 8369 else switch (op_code) 8370 { 8371 case DW_LNS_extended_op: 8372 extended_len = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8373 line_ptr += bytes_read; 8374 extended_end = line_ptr + extended_len; 8375 extended_op = read_1_byte (abfd, line_ptr); 8376 line_ptr += 1; 8377 switch (extended_op) 8378 { 8379 case DW_LNE_end_sequence: 8380 end_sequence = 1; 8381 break; 8382 case DW_LNE_set_address: 8383 address = read_address (abfd, line_ptr, cu, &bytes_read); 8384 op_index = 0; 8385 line_ptr += bytes_read; 8386 address += baseaddr; 8387 break; 8388 case DW_LNE_define_file: 8389 { 8390 char *cur_file; 8391 unsigned int dir_index, mod_time, length; 8392 8393 cur_file = read_string (abfd, line_ptr, &bytes_read); 8394 line_ptr += bytes_read; 8395 dir_index = 8396 read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8397 line_ptr += bytes_read; 8398 mod_time = 8399 read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8400 line_ptr += bytes_read; 8401 length = 8402 read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8403 line_ptr += bytes_read; 8404 add_file_name (lh, cur_file, dir_index, mod_time, length); 8405 } 8406 break; 8407 case DW_LNE_set_discriminator: 8408 /* The discriminator is not interesting to the debugger; 8409 just ignore it. */ 8410 line_ptr = extended_end; 8411 break; 8412 default: 8413 complaint (&symfile_complaints, 8414 _("mangled .debug_line section")); 8415 return; 8416 } 8417 /* Make sure that we parsed the extended op correctly. If e.g. 8418 we expected a different address size than the producer used, 8419 we may have read the wrong number of bytes. */ 8420 if (line_ptr != extended_end) 8421 { 8422 complaint (&symfile_complaints, 8423 _("mangled .debug_line section")); 8424 return; 8425 } 8426 break; 8427 case DW_LNS_copy: 8428 if (lh->num_file_names < file || file == 0) 8429 dwarf2_debug_line_missing_file_complaint (); 8430 else 8431 { 8432 lh->file_names[file - 1].included_p = 1; 8433 if (!decode_for_pst_p && is_stmt) 8434 { 8435 if (last_subfile != current_subfile) 8436 { 8437 addr = gdbarch_addr_bits_remove (gdbarch, address); 8438 if (last_subfile) 8439 record_line (last_subfile, 0, addr); 8440 last_subfile = current_subfile; 8441 } 8442 addr = check_cu_functions (address, cu); 8443 addr = gdbarch_addr_bits_remove (gdbarch, addr); 8444 record_line (current_subfile, line, addr); 8445 } 8446 } 8447 basic_block = 0; 8448 break; 8449 case DW_LNS_advance_pc: 8450 { 8451 CORE_ADDR adjust 8452 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8453 8454 address += (((op_index + adjust) 8455 / lh->maximum_ops_per_instruction) 8456 * lh->minimum_instruction_length); 8457 op_index = ((op_index + adjust) 8458 % lh->maximum_ops_per_instruction); 8459 line_ptr += bytes_read; 8460 } 8461 break; 8462 case DW_LNS_advance_line: 8463 line += read_signed_leb128 (abfd, line_ptr, &bytes_read); 8464 line_ptr += bytes_read; 8465 break; 8466 case DW_LNS_set_file: 8467 { 8468 /* The arrays lh->include_dirs and lh->file_names are 8469 0-based, but the directory and file name numbers in 8470 the statement program are 1-based. */ 8471 struct file_entry *fe; 8472 char *dir = NULL; 8473 8474 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8475 line_ptr += bytes_read; 8476 if (lh->num_file_names < file || file == 0) 8477 dwarf2_debug_line_missing_file_complaint (); 8478 else 8479 { 8480 fe = &lh->file_names[file - 1]; 8481 if (fe->dir_index) 8482 dir = lh->include_dirs[fe->dir_index - 1]; 8483 if (!decode_for_pst_p) 8484 { 8485 last_subfile = current_subfile; 8486 dwarf2_start_subfile (fe->name, dir, comp_dir); 8487 } 8488 } 8489 } 8490 break; 8491 case DW_LNS_set_column: 8492 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8493 line_ptr += bytes_read; 8494 break; 8495 case DW_LNS_negate_stmt: 8496 is_stmt = (!is_stmt); 8497 break; 8498 case DW_LNS_set_basic_block: 8499 basic_block = 1; 8500 break; 8501 /* Add to the address register of the state machine the 8502 address increment value corresponding to special opcode 8503 255. I.e., this value is scaled by the minimum 8504 instruction length since special opcode 255 would have 8505 scaled the the increment. */ 8506 case DW_LNS_const_add_pc: 8507 { 8508 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range; 8509 8510 address += (((op_index + adjust) 8511 / lh->maximum_ops_per_instruction) 8512 * lh->minimum_instruction_length); 8513 op_index = ((op_index + adjust) 8514 % lh->maximum_ops_per_instruction); 8515 } 8516 break; 8517 case DW_LNS_fixed_advance_pc: 8518 address += read_2_bytes (abfd, line_ptr); 8519 op_index = 0; 8520 line_ptr += 2; 8521 break; 8522 default: 8523 { 8524 /* Unknown standard opcode, ignore it. */ 8525 int i; 8526 8527 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++) 8528 { 8529 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read); 8530 line_ptr += bytes_read; 8531 } 8532 } 8533 } 8534 } 8535 if (lh->num_file_names < file || file == 0) 8536 dwarf2_debug_line_missing_file_complaint (); 8537 else 8538 { 8539 lh->file_names[file - 1].included_p = 1; 8540 if (!decode_for_pst_p) 8541 { 8542 addr = gdbarch_addr_bits_remove (gdbarch, address); 8543 record_line (current_subfile, 0, addr); 8544 } 8545 } 8546 } 8547 8548 if (decode_for_pst_p) 8549 { 8550 int file_index; 8551 8552 /* Now that we're done scanning the Line Header Program, we can 8553 create the psymtab of each included file. */ 8554 for (file_index = 0; file_index < lh->num_file_names; file_index++) 8555 if (lh->file_names[file_index].included_p == 1) 8556 { 8557 const struct file_entry fe = lh->file_names [file_index]; 8558 char *include_name = fe.name; 8559 char *dir_name = NULL; 8560 char *pst_filename = pst->filename; 8561 8562 if (fe.dir_index) 8563 dir_name = lh->include_dirs[fe.dir_index - 1]; 8564 8565 if (!IS_ABSOLUTE_PATH (include_name) && dir_name != NULL) 8566 { 8567 include_name = concat (dir_name, SLASH_STRING, 8568 include_name, (char *)NULL); 8569 make_cleanup (xfree, include_name); 8570 } 8571 8572 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL) 8573 { 8574 pst_filename = concat (pst->dirname, SLASH_STRING, 8575 pst_filename, (char *)NULL); 8576 make_cleanup (xfree, pst_filename); 8577 } 8578 8579 if (strcmp (include_name, pst_filename) != 0) 8580 dwarf2_create_include_psymtab (include_name, pst, objfile); 8581 } 8582 } 8583 else 8584 { 8585 /* Make sure a symtab is created for every file, even files 8586 which contain only variables (i.e. no code with associated 8587 line numbers). */ 8588 8589 int i; 8590 struct file_entry *fe; 8591 8592 for (i = 0; i < lh->num_file_names; i++) 8593 { 8594 char *dir = NULL; 8595 8596 fe = &lh->file_names[i]; 8597 if (fe->dir_index) 8598 dir = lh->include_dirs[fe->dir_index - 1]; 8599 dwarf2_start_subfile (fe->name, dir, comp_dir); 8600 8601 /* Skip the main file; we don't need it, and it must be 8602 allocated last, so that it will show up before the 8603 non-primary symtabs in the objfile's symtab list. */ 8604 if (current_subfile == first_subfile) 8605 continue; 8606 8607 if (current_subfile->symtab == NULL) 8608 current_subfile->symtab = allocate_symtab (current_subfile->name, 8609 cu->objfile); 8610 fe->symtab = current_subfile->symtab; 8611 } 8612 } 8613 } 8614 8615 /* Start a subfile for DWARF. FILENAME is the name of the file and 8616 DIRNAME the name of the source directory which contains FILENAME 8617 or NULL if not known. COMP_DIR is the compilation directory for the 8618 linetable's compilation unit or NULL if not known. 8619 This routine tries to keep line numbers from identical absolute and 8620 relative file names in a common subfile. 8621 8622 Using the `list' example from the GDB testsuite, which resides in 8623 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename 8624 of /srcdir/list0.c yields the following debugging information for list0.c: 8625 8626 DW_AT_name: /srcdir/list0.c 8627 DW_AT_comp_dir: /compdir 8628 files.files[0].name: list0.h 8629 files.files[0].dir: /srcdir 8630 files.files[1].name: list0.c 8631 files.files[1].dir: /srcdir 8632 8633 The line number information for list0.c has to end up in a single 8634 subfile, so that `break /srcdir/list0.c:1' works as expected. 8635 start_subfile will ensure that this happens provided that we pass the 8636 concatenation of files.files[1].dir and files.files[1].name as the 8637 subfile's name. */ 8638 8639 static void 8640 dwarf2_start_subfile (char *filename, char *dirname, char *comp_dir) 8641 { 8642 char *fullname; 8643 8644 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir). 8645 `start_symtab' will always pass the contents of DW_AT_comp_dir as 8646 second argument to start_subfile. To be consistent, we do the 8647 same here. In order not to lose the line information directory, 8648 we concatenate it to the filename when it makes sense. 8649 Note that the Dwarf3 standard says (speaking of filenames in line 8650 information): ``The directory index is ignored for file names 8651 that represent full path names''. Thus ignoring dirname in the 8652 `else' branch below isn't an issue. */ 8653 8654 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL) 8655 fullname = concat (dirname, SLASH_STRING, filename, (char *)NULL); 8656 else 8657 fullname = filename; 8658 8659 start_subfile (fullname, comp_dir); 8660 8661 if (fullname != filename) 8662 xfree (fullname); 8663 } 8664 8665 static void 8666 var_decode_location (struct attribute *attr, struct symbol *sym, 8667 struct dwarf2_cu *cu) 8668 { 8669 struct objfile *objfile = cu->objfile; 8670 struct comp_unit_head *cu_header = &cu->header; 8671 8672 /* NOTE drow/2003-01-30: There used to be a comment and some special 8673 code here to turn a symbol with DW_AT_external and a 8674 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was 8675 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux 8676 with some versions of binutils) where shared libraries could have 8677 relocations against symbols in their debug information - the 8678 minimal symbol would have the right address, but the debug info 8679 would not. It's no longer necessary, because we will explicitly 8680 apply relocations when we read in the debug information now. */ 8681 8682 /* A DW_AT_location attribute with no contents indicates that a 8683 variable has been optimized away. */ 8684 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0) 8685 { 8686 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT; 8687 return; 8688 } 8689 8690 /* Handle one degenerate form of location expression specially, to 8691 preserve GDB's previous behavior when section offsets are 8692 specified. If this is just a DW_OP_addr then mark this symbol 8693 as LOC_STATIC. */ 8694 8695 if (attr_form_is_block (attr) 8696 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size 8697 && DW_BLOCK (attr)->data[0] == DW_OP_addr) 8698 { 8699 unsigned int dummy; 8700 8701 SYMBOL_VALUE_ADDRESS (sym) = 8702 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy); 8703 SYMBOL_CLASS (sym) = LOC_STATIC; 8704 fixup_symbol_section (sym, objfile); 8705 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets, 8706 SYMBOL_SECTION (sym)); 8707 return; 8708 } 8709 8710 /* NOTE drow/2002-01-30: It might be worthwhile to have a static 8711 expression evaluator, and use LOC_COMPUTED only when necessary 8712 (i.e. when the value of a register or memory location is 8713 referenced, or a thread-local block, etc.). Then again, it might 8714 not be worthwhile. I'm assuming that it isn't unless performance 8715 or memory numbers show me otherwise. */ 8716 8717 dwarf2_symbol_mark_computed (attr, sym, cu); 8718 SYMBOL_CLASS (sym) = LOC_COMPUTED; 8719 } 8720 8721 /* Given a pointer to a DWARF information entry, figure out if we need 8722 to make a symbol table entry for it, and if so, create a new entry 8723 and return a pointer to it. 8724 If TYPE is NULL, determine symbol type from the die, otherwise 8725 used the passed type. */ 8726 8727 static struct symbol * 8728 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu) 8729 { 8730 struct objfile *objfile = cu->objfile; 8731 struct symbol *sym = NULL; 8732 char *name; 8733 struct attribute *attr = NULL; 8734 struct attribute *attr2 = NULL; 8735 CORE_ADDR baseaddr; 8736 int inlined_func = (die->tag == DW_TAG_inlined_subroutine); 8737 8738 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 8739 8740 name = dwarf2_name (die, cu); 8741 if (name) 8742 { 8743 const char *linkagename; 8744 8745 sym = (struct symbol *) obstack_alloc (&objfile->objfile_obstack, 8746 sizeof (struct symbol)); 8747 OBJSTAT (objfile, n_syms++); 8748 memset (sym, 0, sizeof (struct symbol)); 8749 8750 /* Cache this symbol's name and the name's demangled form (if any). */ 8751 SYMBOL_LANGUAGE (sym) = cu->language; 8752 linkagename = dwarf2_physname (name, die, cu); 8753 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile); 8754 8755 /* Fortran does not have mangling standard and the mangling does differ 8756 between gfortran, iFort etc. */ 8757 if (cu->language == language_fortran 8758 && sym->ginfo.language_specific.cplus_specific.demangled_name == NULL) 8759 sym->ginfo.language_specific.cplus_specific.demangled_name 8760 = (char *) dwarf2_full_name (name, die, cu); 8761 8762 /* Default assumptions. 8763 Use the passed type or decode it from the die. */ 8764 SYMBOL_DOMAIN (sym) = VAR_DOMAIN; 8765 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT; 8766 if (type != NULL) 8767 SYMBOL_TYPE (sym) = type; 8768 else 8769 SYMBOL_TYPE (sym) = die_type (die, cu); 8770 attr = dwarf2_attr (die, 8771 inlined_func ? DW_AT_call_line : DW_AT_decl_line, 8772 cu); 8773 if (attr) 8774 { 8775 SYMBOL_LINE (sym) = DW_UNSND (attr); 8776 } 8777 8778 attr = dwarf2_attr (die, 8779 inlined_func ? DW_AT_call_file : DW_AT_decl_file, 8780 cu); 8781 if (attr) 8782 { 8783 int file_index = DW_UNSND (attr); 8784 8785 if (cu->line_header == NULL 8786 || file_index > cu->line_header->num_file_names) 8787 complaint (&symfile_complaints, 8788 _("file index out of range")); 8789 else if (file_index > 0) 8790 { 8791 struct file_entry *fe; 8792 8793 fe = &cu->line_header->file_names[file_index - 1]; 8794 SYMBOL_SYMTAB (sym) = fe->symtab; 8795 } 8796 } 8797 8798 switch (die->tag) 8799 { 8800 case DW_TAG_label: 8801 attr = dwarf2_attr (die, DW_AT_low_pc, cu); 8802 if (attr) 8803 { 8804 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr; 8805 } 8806 SYMBOL_CLASS (sym) = LOC_LABEL; 8807 break; 8808 case DW_TAG_subprogram: 8809 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by 8810 finish_block. */ 8811 SYMBOL_CLASS (sym) = LOC_BLOCK; 8812 attr2 = dwarf2_attr (die, DW_AT_external, cu); 8813 if ((attr2 && (DW_UNSND (attr2) != 0)) 8814 || cu->language == language_ada) 8815 { 8816 /* Subprograms marked external are stored as a global symbol. 8817 Ada subprograms, whether marked external or not, are always 8818 stored as a global symbol, because we want to be able to 8819 access them globally. For instance, we want to be able 8820 to break on a nested subprogram without having to 8821 specify the context. */ 8822 add_symbol_to_list (sym, &global_symbols); 8823 } 8824 else 8825 { 8826 add_symbol_to_list (sym, cu->list_in_scope); 8827 } 8828 break; 8829 case DW_TAG_inlined_subroutine: 8830 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by 8831 finish_block. */ 8832 SYMBOL_CLASS (sym) = LOC_BLOCK; 8833 SYMBOL_INLINED (sym) = 1; 8834 /* Do not add the symbol to any lists. It will be found via 8835 BLOCK_FUNCTION from the blockvector. */ 8836 break; 8837 case DW_TAG_variable: 8838 case DW_TAG_member: 8839 /* Compilation with minimal debug info may result in variables 8840 with missing type entries. Change the misleading `void' type 8841 to something sensible. */ 8842 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID) 8843 SYMBOL_TYPE (sym) 8844 = objfile_type (objfile)->nodebug_data_symbol; 8845 8846 attr = dwarf2_attr (die, DW_AT_const_value, cu); 8847 /* In the case of DW_TAG_member, we should only be called for 8848 static const members. */ 8849 if (die->tag == DW_TAG_member) 8850 { 8851 /* dwarf2_add_field uses die_is_declaration, 8852 so we do the same. */ 8853 gdb_assert (die_is_declaration (die, cu)); 8854 gdb_assert (attr); 8855 } 8856 if (attr) 8857 { 8858 dwarf2_const_value (attr, sym, cu); 8859 attr2 = dwarf2_attr (die, DW_AT_external, cu); 8860 if (attr2 && (DW_UNSND (attr2) != 0)) 8861 add_symbol_to_list (sym, &global_symbols); 8862 else 8863 add_symbol_to_list (sym, cu->list_in_scope); 8864 break; 8865 } 8866 attr = dwarf2_attr (die, DW_AT_location, cu); 8867 if (attr) 8868 { 8869 var_decode_location (attr, sym, cu); 8870 attr2 = dwarf2_attr (die, DW_AT_external, cu); 8871 if (attr2 && (DW_UNSND (attr2) != 0)) 8872 { 8873 struct pending **list_to_add; 8874 8875 /* Workaround gfortran PR debug/40040 - it uses 8876 DW_AT_location for variables in -fPIC libraries which may 8877 get overriden by other libraries/executable and get 8878 a different address. Resolve it by the minimal symbol 8879 which may come from inferior's executable using copy 8880 relocation. Make this workaround only for gfortran as for 8881 other compilers GDB cannot guess the minimal symbol 8882 Fortran mangling kind. */ 8883 if (cu->language == language_fortran && die->parent 8884 && die->parent->tag == DW_TAG_module 8885 && cu->producer 8886 && strncmp (cu->producer, "GNU Fortran ", 12) == 0) 8887 SYMBOL_CLASS (sym) = LOC_UNRESOLVED; 8888 8889 /* A variable with DW_AT_external is never static, 8890 but it may be block-scoped. */ 8891 list_to_add = (cu->list_in_scope == &file_symbols 8892 ? &global_symbols : cu->list_in_scope); 8893 add_symbol_to_list (sym, list_to_add); 8894 } 8895 else 8896 add_symbol_to_list (sym, cu->list_in_scope); 8897 } 8898 else 8899 { 8900 /* We do not know the address of this symbol. 8901 If it is an external symbol and we have type information 8902 for it, enter the symbol as a LOC_UNRESOLVED symbol. 8903 The address of the variable will then be determined from 8904 the minimal symbol table whenever the variable is 8905 referenced. */ 8906 attr2 = dwarf2_attr (die, DW_AT_external, cu); 8907 if (attr2 && (DW_UNSND (attr2) != 0) 8908 && dwarf2_attr (die, DW_AT_type, cu) != NULL) 8909 { 8910 struct pending **list_to_add; 8911 8912 /* A variable with DW_AT_external is never static, but it 8913 may be block-scoped. */ 8914 list_to_add = (cu->list_in_scope == &file_symbols 8915 ? &global_symbols : cu->list_in_scope); 8916 8917 SYMBOL_CLASS (sym) = LOC_UNRESOLVED; 8918 add_symbol_to_list (sym, list_to_add); 8919 } 8920 else if (!die_is_declaration (die, cu)) 8921 { 8922 /* Use the default LOC_OPTIMIZED_OUT class. */ 8923 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT); 8924 add_symbol_to_list (sym, cu->list_in_scope); 8925 } 8926 } 8927 break; 8928 case DW_TAG_formal_parameter: 8929 /* If we are inside a function, mark this as an argument. If 8930 not, we might be looking at an argument to an inlined function 8931 when we do not have enough information to show inlined frames; 8932 pretend it's a local variable in that case so that the user can 8933 still see it. */ 8934 if (context_stack_depth > 0 8935 && context_stack[context_stack_depth - 1].name != NULL) 8936 SYMBOL_IS_ARGUMENT (sym) = 1; 8937 attr = dwarf2_attr (die, DW_AT_location, cu); 8938 if (attr) 8939 { 8940 var_decode_location (attr, sym, cu); 8941 } 8942 attr = dwarf2_attr (die, DW_AT_const_value, cu); 8943 if (attr) 8944 { 8945 dwarf2_const_value (attr, sym, cu); 8946 } 8947 attr = dwarf2_attr (die, DW_AT_variable_parameter, cu); 8948 if (attr && DW_UNSND (attr)) 8949 { 8950 struct type *ref_type; 8951 8952 ref_type = lookup_reference_type (SYMBOL_TYPE (sym)); 8953 SYMBOL_TYPE (sym) = ref_type; 8954 } 8955 8956 add_symbol_to_list (sym, cu->list_in_scope); 8957 break; 8958 case DW_TAG_unspecified_parameters: 8959 /* From varargs functions; gdb doesn't seem to have any 8960 interest in this information, so just ignore it for now. 8961 (FIXME?) */ 8962 break; 8963 case DW_TAG_class_type: 8964 case DW_TAG_interface_type: 8965 case DW_TAG_structure_type: 8966 case DW_TAG_union_type: 8967 case DW_TAG_set_type: 8968 case DW_TAG_enumeration_type: 8969 SYMBOL_CLASS (sym) = LOC_TYPEDEF; 8970 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; 8971 8972 { 8973 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't 8974 really ever be static objects: otherwise, if you try 8975 to, say, break of a class's method and you're in a file 8976 which doesn't mention that class, it won't work unless 8977 the check for all static symbols in lookup_symbol_aux 8978 saves you. See the OtherFileClass tests in 8979 gdb.c++/namespace.exp. */ 8980 8981 struct pending **list_to_add; 8982 8983 list_to_add = (cu->list_in_scope == &file_symbols 8984 && (cu->language == language_cplus 8985 || cu->language == language_java) 8986 ? &global_symbols : cu->list_in_scope); 8987 8988 add_symbol_to_list (sym, list_to_add); 8989 8990 /* The semantics of C++ state that "struct foo { ... }" also 8991 defines a typedef for "foo". A Java class declaration also 8992 defines a typedef for the class. */ 8993 if (cu->language == language_cplus 8994 || cu->language == language_java 8995 || cu->language == language_ada) 8996 { 8997 /* The symbol's name is already allocated along with 8998 this objfile, so we don't need to duplicate it for 8999 the type. */ 9000 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0) 9001 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym); 9002 } 9003 } 9004 break; 9005 case DW_TAG_typedef: 9006 SYMBOL_CLASS (sym) = LOC_TYPEDEF; 9007 SYMBOL_DOMAIN (sym) = VAR_DOMAIN; 9008 add_symbol_to_list (sym, cu->list_in_scope); 9009 break; 9010 case DW_TAG_base_type: 9011 case DW_TAG_subrange_type: 9012 SYMBOL_CLASS (sym) = LOC_TYPEDEF; 9013 SYMBOL_DOMAIN (sym) = VAR_DOMAIN; 9014 add_symbol_to_list (sym, cu->list_in_scope); 9015 break; 9016 case DW_TAG_enumerator: 9017 attr = dwarf2_attr (die, DW_AT_const_value, cu); 9018 if (attr) 9019 { 9020 dwarf2_const_value (attr, sym, cu); 9021 } 9022 { 9023 /* NOTE: carlton/2003-11-10: See comment above in the 9024 DW_TAG_class_type, etc. block. */ 9025 9026 struct pending **list_to_add; 9027 9028 list_to_add = (cu->list_in_scope == &file_symbols 9029 && (cu->language == language_cplus 9030 || cu->language == language_java) 9031 ? &global_symbols : cu->list_in_scope); 9032 9033 add_symbol_to_list (sym, list_to_add); 9034 } 9035 break; 9036 case DW_TAG_namespace: 9037 SYMBOL_CLASS (sym) = LOC_TYPEDEF; 9038 add_symbol_to_list (sym, &global_symbols); 9039 break; 9040 default: 9041 /* Not a tag we recognize. Hopefully we aren't processing 9042 trash data, but since we must specifically ignore things 9043 we don't recognize, there is nothing else we should do at 9044 this point. */ 9045 complaint (&symfile_complaints, _("unsupported tag: '%s'"), 9046 dwarf_tag_name (die->tag)); 9047 break; 9048 } 9049 9050 /* For the benefit of old versions of GCC, check for anonymous 9051 namespaces based on the demangled name. */ 9052 if (!processing_has_namespace_info 9053 && cu->language == language_cplus) 9054 cp_scan_for_anonymous_namespaces (sym); 9055 } 9056 return (sym); 9057 } 9058 9059 /* Copy constant value from an attribute to a symbol. */ 9060 9061 static void 9062 dwarf2_const_value (struct attribute *attr, struct symbol *sym, 9063 struct dwarf2_cu *cu) 9064 { 9065 struct objfile *objfile = cu->objfile; 9066 struct comp_unit_head *cu_header = &cu->header; 9067 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ? 9068 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE; 9069 struct dwarf_block *blk; 9070 9071 switch (attr->form) 9072 { 9073 case DW_FORM_addr: 9074 { 9075 struct dwarf2_locexpr_baton *baton; 9076 gdb_byte *data; 9077 9078 if (TYPE_LENGTH (SYMBOL_TYPE (sym)) != cu_header->addr_size) 9079 dwarf2_const_value_length_mismatch_complaint (SYMBOL_PRINT_NAME (sym), 9080 cu_header->addr_size, 9081 TYPE_LENGTH (SYMBOL_TYPE 9082 (sym))); 9083 /* Symbols of this form are reasonably rare, so we just 9084 piggyback on the existing location code rather than writing 9085 a new implementation of symbol_computed_ops. */ 9086 baton = obstack_alloc (&objfile->objfile_obstack, 9087 sizeof (struct dwarf2_locexpr_baton)); 9088 baton->per_cu = cu->per_cu; 9089 gdb_assert (baton->per_cu); 9090 9091 baton->size = 2 + cu_header->addr_size; 9092 data = obstack_alloc (&objfile->objfile_obstack, baton->size); 9093 baton->data = data; 9094 9095 data[0] = DW_OP_addr; 9096 store_unsigned_integer (&data[1], cu_header->addr_size, 9097 byte_order, DW_ADDR (attr)); 9098 data[cu_header->addr_size + 1] = DW_OP_stack_value; 9099 9100 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs; 9101 SYMBOL_LOCATION_BATON (sym) = baton; 9102 SYMBOL_CLASS (sym) = LOC_COMPUTED; 9103 } 9104 break; 9105 case DW_FORM_string: 9106 case DW_FORM_strp: 9107 /* DW_STRING is already allocated on the obstack, point directly 9108 to it. */ 9109 SYMBOL_VALUE_BYTES (sym) = (gdb_byte *) DW_STRING (attr); 9110 SYMBOL_CLASS (sym) = LOC_CONST_BYTES; 9111 break; 9112 case DW_FORM_block1: 9113 case DW_FORM_block2: 9114 case DW_FORM_block4: 9115 case DW_FORM_block: 9116 case DW_FORM_exprloc: 9117 blk = DW_BLOCK (attr); 9118 if (TYPE_LENGTH (SYMBOL_TYPE (sym)) != blk->size) 9119 dwarf2_const_value_length_mismatch_complaint (SYMBOL_PRINT_NAME (sym), 9120 blk->size, 9121 TYPE_LENGTH (SYMBOL_TYPE 9122 (sym))); 9123 SYMBOL_VALUE_BYTES (sym) = 9124 obstack_alloc (&objfile->objfile_obstack, blk->size); 9125 memcpy (SYMBOL_VALUE_BYTES (sym), blk->data, blk->size); 9126 SYMBOL_CLASS (sym) = LOC_CONST_BYTES; 9127 break; 9128 9129 /* The DW_AT_const_value attributes are supposed to carry the 9130 symbol's value "represented as it would be on the target 9131 architecture." By the time we get here, it's already been 9132 converted to host endianness, so we just need to sign- or 9133 zero-extend it as appropriate. */ 9134 case DW_FORM_data1: 9135 dwarf2_const_value_data (attr, sym, 8); 9136 break; 9137 case DW_FORM_data2: 9138 dwarf2_const_value_data (attr, sym, 16); 9139 break; 9140 case DW_FORM_data4: 9141 dwarf2_const_value_data (attr, sym, 32); 9142 break; 9143 case DW_FORM_data8: 9144 dwarf2_const_value_data (attr, sym, 64); 9145 break; 9146 9147 case DW_FORM_sdata: 9148 SYMBOL_VALUE (sym) = DW_SND (attr); 9149 SYMBOL_CLASS (sym) = LOC_CONST; 9150 break; 9151 9152 case DW_FORM_udata: 9153 SYMBOL_VALUE (sym) = DW_UNSND (attr); 9154 SYMBOL_CLASS (sym) = LOC_CONST; 9155 break; 9156 9157 default: 9158 complaint (&symfile_complaints, 9159 _("unsupported const value attribute form: '%s'"), 9160 dwarf_form_name (attr->form)); 9161 SYMBOL_VALUE (sym) = 0; 9162 SYMBOL_CLASS (sym) = LOC_CONST; 9163 break; 9164 } 9165 } 9166 9167 9168 /* Given an attr with a DW_FORM_dataN value in host byte order, sign- 9169 or zero-extend it as appropriate for the symbol's type. */ 9170 static void 9171 dwarf2_const_value_data (struct attribute *attr, 9172 struct symbol *sym, 9173 int bits) 9174 { 9175 LONGEST l = DW_UNSND (attr); 9176 9177 if (bits < sizeof (l) * 8) 9178 { 9179 if (TYPE_UNSIGNED (SYMBOL_TYPE (sym))) 9180 l &= ((LONGEST) 1 << bits) - 1; 9181 else 9182 l = (l << (sizeof (l) * 8 - bits)) >> (sizeof (l) * 8 - bits); 9183 } 9184 9185 SYMBOL_VALUE (sym) = l; 9186 SYMBOL_CLASS (sym) = LOC_CONST; 9187 } 9188 9189 9190 /* Return the type of the die in question using its DW_AT_type attribute. */ 9191 9192 static struct type * 9193 die_type (struct die_info *die, struct dwarf2_cu *cu) 9194 { 9195 struct attribute *type_attr; 9196 struct die_info *type_die; 9197 9198 type_attr = dwarf2_attr (die, DW_AT_type, cu); 9199 if (!type_attr) 9200 { 9201 /* A missing DW_AT_type represents a void type. */ 9202 return objfile_type (cu->objfile)->builtin_void; 9203 } 9204 9205 type_die = follow_die_ref_or_sig (die, type_attr, &cu); 9206 9207 return tag_type_to_type (type_die, cu); 9208 } 9209 9210 /* True iff CU's producer generates GNAT Ada auxiliary information 9211 that allows to find parallel types through that information instead 9212 of having to do expensive parallel lookups by type name. */ 9213 9214 static int 9215 need_gnat_info (struct dwarf2_cu *cu) 9216 { 9217 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version 9218 of GNAT produces this auxiliary information, without any indication 9219 that it is produced. Part of enhancing the FSF version of GNAT 9220 to produce that information will be to put in place an indicator 9221 that we can use in order to determine whether the descriptive type 9222 info is available or not. One suggestion that has been made is 9223 to use a new attribute, attached to the CU die. For now, assume 9224 that the descriptive type info is not available. */ 9225 return 0; 9226 } 9227 9228 9229 /* Return the auxiliary type of the die in question using its 9230 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the 9231 attribute is not present. */ 9232 9233 static struct type * 9234 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu) 9235 { 9236 struct attribute *type_attr; 9237 struct die_info *type_die; 9238 9239 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu); 9240 if (!type_attr) 9241 return NULL; 9242 9243 type_die = follow_die_ref (die, type_attr, &cu); 9244 return tag_type_to_type (type_die, cu); 9245 } 9246 9247 /* If DIE has a descriptive_type attribute, then set the TYPE's 9248 descriptive type accordingly. */ 9249 9250 static void 9251 set_descriptive_type (struct type *type, struct die_info *die, 9252 struct dwarf2_cu *cu) 9253 { 9254 struct type *descriptive_type = die_descriptive_type (die, cu); 9255 9256 if (descriptive_type) 9257 { 9258 ALLOCATE_GNAT_AUX_TYPE (type); 9259 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type; 9260 } 9261 } 9262 9263 /* Return the containing type of the die in question using its 9264 DW_AT_containing_type attribute. */ 9265 9266 static struct type * 9267 die_containing_type (struct die_info *die, struct dwarf2_cu *cu) 9268 { 9269 struct attribute *type_attr; 9270 struct die_info *type_die; 9271 9272 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu); 9273 if (!type_attr) 9274 error (_("Dwarf Error: Problem turning containing type into gdb type " 9275 "[in module %s]"), cu->objfile->name); 9276 9277 type_die = follow_die_ref_or_sig (die, type_attr, &cu); 9278 return tag_type_to_type (type_die, cu); 9279 } 9280 9281 static struct type * 9282 tag_type_to_type (struct die_info *die, struct dwarf2_cu *cu) 9283 { 9284 struct type *this_type; 9285 9286 this_type = read_type_die (die, cu); 9287 if (!this_type) 9288 { 9289 char *message, *saved; 9290 9291 /* read_type_die already issued a complaint. */ 9292 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"), 9293 cu->objfile->name, 9294 cu->header.offset, 9295 die->offset); 9296 saved = obstack_copy0 (&cu->objfile->objfile_obstack, 9297 message, strlen (message)); 9298 xfree (message); 9299 9300 this_type = init_type (TYPE_CODE_ERROR, 0, 0, saved, cu->objfile); 9301 } 9302 return this_type; 9303 } 9304 9305 static struct type * 9306 read_type_die (struct die_info *die, struct dwarf2_cu *cu) 9307 { 9308 struct type *this_type; 9309 9310 this_type = get_die_type (die, cu); 9311 if (this_type) 9312 return this_type; 9313 9314 switch (die->tag) 9315 { 9316 case DW_TAG_class_type: 9317 case DW_TAG_interface_type: 9318 case DW_TAG_structure_type: 9319 case DW_TAG_union_type: 9320 this_type = read_structure_type (die, cu); 9321 break; 9322 case DW_TAG_enumeration_type: 9323 this_type = read_enumeration_type (die, cu); 9324 break; 9325 case DW_TAG_subprogram: 9326 case DW_TAG_subroutine_type: 9327 case DW_TAG_inlined_subroutine: 9328 this_type = read_subroutine_type (die, cu); 9329 break; 9330 case DW_TAG_array_type: 9331 this_type = read_array_type (die, cu); 9332 break; 9333 case DW_TAG_set_type: 9334 this_type = read_set_type (die, cu); 9335 break; 9336 case DW_TAG_pointer_type: 9337 this_type = read_tag_pointer_type (die, cu); 9338 break; 9339 case DW_TAG_ptr_to_member_type: 9340 this_type = read_tag_ptr_to_member_type (die, cu); 9341 break; 9342 case DW_TAG_reference_type: 9343 this_type = read_tag_reference_type (die, cu); 9344 break; 9345 case DW_TAG_const_type: 9346 this_type = read_tag_const_type (die, cu); 9347 break; 9348 case DW_TAG_volatile_type: 9349 this_type = read_tag_volatile_type (die, cu); 9350 break; 9351 case DW_TAG_string_type: 9352 this_type = read_tag_string_type (die, cu); 9353 break; 9354 case DW_TAG_typedef: 9355 this_type = read_typedef (die, cu); 9356 break; 9357 case DW_TAG_subrange_type: 9358 this_type = read_subrange_type (die, cu); 9359 break; 9360 case DW_TAG_base_type: 9361 this_type = read_base_type (die, cu); 9362 break; 9363 case DW_TAG_unspecified_type: 9364 this_type = read_unspecified_type (die, cu); 9365 break; 9366 case DW_TAG_namespace: 9367 this_type = read_namespace_type (die, cu); 9368 break; 9369 case DW_TAG_module: 9370 this_type = read_module_type (die, cu); 9371 break; 9372 default: 9373 complaint (&symfile_complaints, _("unexpected tag in read_type_die: '%s'"), 9374 dwarf_tag_name (die->tag)); 9375 break; 9376 } 9377 9378 return this_type; 9379 } 9380 9381 /* Return the name of the namespace/class that DIE is defined within, 9382 or "" if we can't tell. The caller should not xfree the result. 9383 9384 For example, if we're within the method foo() in the following 9385 code: 9386 9387 namespace N { 9388 class C { 9389 void foo () { 9390 } 9391 }; 9392 } 9393 9394 then determine_prefix on foo's die will return "N::C". */ 9395 9396 static char * 9397 determine_prefix (struct die_info *die, struct dwarf2_cu *cu) 9398 { 9399 struct die_info *parent, *spec_die; 9400 struct dwarf2_cu *spec_cu; 9401 struct type *parent_type; 9402 9403 if (cu->language != language_cplus && cu->language != language_java 9404 && cu->language != language_fortran) 9405 return ""; 9406 9407 /* We have to be careful in the presence of DW_AT_specification. 9408 For example, with GCC 3.4, given the code 9409 9410 namespace N { 9411 void foo() { 9412 // Definition of N::foo. 9413 } 9414 } 9415 9416 then we'll have a tree of DIEs like this: 9417 9418 1: DW_TAG_compile_unit 9419 2: DW_TAG_namespace // N 9420 3: DW_TAG_subprogram // declaration of N::foo 9421 4: DW_TAG_subprogram // definition of N::foo 9422 DW_AT_specification // refers to die #3 9423 9424 Thus, when processing die #4, we have to pretend that we're in 9425 the context of its DW_AT_specification, namely the contex of die 9426 #3. */ 9427 spec_cu = cu; 9428 spec_die = die_specification (die, &spec_cu); 9429 if (spec_die == NULL) 9430 parent = die->parent; 9431 else 9432 { 9433 parent = spec_die->parent; 9434 cu = spec_cu; 9435 } 9436 9437 if (parent == NULL) 9438 return ""; 9439 else 9440 switch (parent->tag) 9441 { 9442 case DW_TAG_namespace: 9443 parent_type = read_type_die (parent, cu); 9444 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus 9445 DW_TAG_namespace DIEs with a name of "::" for the global namespace. 9446 Work around this problem here. */ 9447 if (cu->language == language_cplus 9448 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0) 9449 return ""; 9450 /* We give a name to even anonymous namespaces. */ 9451 return TYPE_TAG_NAME (parent_type); 9452 case DW_TAG_class_type: 9453 case DW_TAG_interface_type: 9454 case DW_TAG_structure_type: 9455 case DW_TAG_union_type: 9456 case DW_TAG_module: 9457 parent_type = read_type_die (parent, cu); 9458 if (TYPE_TAG_NAME (parent_type) != NULL) 9459 return TYPE_TAG_NAME (parent_type); 9460 else 9461 /* An anonymous structure is only allowed non-static data 9462 members; no typedefs, no member functions, et cetera. 9463 So it does not need a prefix. */ 9464 return ""; 9465 default: 9466 return determine_prefix (parent, cu); 9467 } 9468 } 9469 9470 /* Return a newly-allocated string formed by concatenating PREFIX and 9471 SUFFIX with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then 9472 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, 9473 perform an obconcat, otherwise allocate storage for the result. The CU argument 9474 is used to determine the language and hence, the appropriate separator. */ 9475 9476 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */ 9477 9478 static char * 9479 typename_concat (struct obstack *obs, const char *prefix, const char *suffix, 9480 int physname, struct dwarf2_cu *cu) 9481 { 9482 const char *lead = ""; 9483 const char *sep; 9484 9485 if (suffix == NULL || suffix[0] == '\0' || prefix == NULL || prefix[0] == '\0') 9486 sep = ""; 9487 else if (cu->language == language_java) 9488 sep = "."; 9489 else if (cu->language == language_fortran && physname) 9490 { 9491 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or 9492 DW_AT_MIPS_linkage_name is preferred and used instead. */ 9493 9494 lead = "__"; 9495 sep = "_MOD_"; 9496 } 9497 else 9498 sep = "::"; 9499 9500 if (prefix == NULL) 9501 prefix = ""; 9502 if (suffix == NULL) 9503 suffix = ""; 9504 9505 if (obs == NULL) 9506 { 9507 char *retval = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1); 9508 9509 strcpy (retval, lead); 9510 strcat (retval, prefix); 9511 strcat (retval, sep); 9512 strcat (retval, suffix); 9513 return retval; 9514 } 9515 else 9516 { 9517 /* We have an obstack. */ 9518 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL); 9519 } 9520 } 9521 9522 /* Return sibling of die, NULL if no sibling. */ 9523 9524 static struct die_info * 9525 sibling_die (struct die_info *die) 9526 { 9527 return die->sibling; 9528 } 9529 9530 /* Get name of a die, return NULL if not found. */ 9531 9532 static char * 9533 dwarf2_canonicalize_name (char *name, struct dwarf2_cu *cu, 9534 struct obstack *obstack) 9535 { 9536 if (name && cu->language == language_cplus) 9537 { 9538 char *canon_name = cp_canonicalize_string (name); 9539 9540 if (canon_name != NULL) 9541 { 9542 if (strcmp (canon_name, name) != 0) 9543 name = obsavestring (canon_name, strlen (canon_name), 9544 obstack); 9545 xfree (canon_name); 9546 } 9547 } 9548 9549 return name; 9550 } 9551 9552 /* Get name of a die, return NULL if not found. */ 9553 9554 static char * 9555 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu) 9556 { 9557 struct attribute *attr; 9558 9559 attr = dwarf2_attr (die, DW_AT_name, cu); 9560 if (!attr || !DW_STRING (attr)) 9561 return NULL; 9562 9563 switch (die->tag) 9564 { 9565 case DW_TAG_compile_unit: 9566 /* Compilation units have a DW_AT_name that is a filename, not 9567 a source language identifier. */ 9568 case DW_TAG_enumeration_type: 9569 case DW_TAG_enumerator: 9570 /* These tags always have simple identifiers already; no need 9571 to canonicalize them. */ 9572 return DW_STRING (attr); 9573 9574 case DW_TAG_subprogram: 9575 /* Java constructors will all be named "<init>", so return 9576 the class name when we see this special case. */ 9577 if (cu->language == language_java 9578 && DW_STRING (attr) != NULL 9579 && strcmp (DW_STRING (attr), "<init>") == 0) 9580 { 9581 struct dwarf2_cu *spec_cu = cu; 9582 struct die_info *spec_die; 9583 9584 /* GCJ will output '<init>' for Java constructor names. 9585 For this special case, return the name of the parent class. */ 9586 9587 /* GCJ may output suprogram DIEs with AT_specification set. 9588 If so, use the name of the specified DIE. */ 9589 spec_die = die_specification (die, &spec_cu); 9590 if (spec_die != NULL) 9591 return dwarf2_name (spec_die, spec_cu); 9592 9593 do 9594 { 9595 die = die->parent; 9596 if (die->tag == DW_TAG_class_type) 9597 return dwarf2_name (die, cu); 9598 } 9599 while (die->tag != DW_TAG_compile_unit); 9600 } 9601 break; 9602 9603 case DW_TAG_class_type: 9604 case DW_TAG_interface_type: 9605 case DW_TAG_structure_type: 9606 case DW_TAG_union_type: 9607 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed 9608 structures or unions. These were of the form "._%d" in GCC 4.1, 9609 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3 9610 and GCC 4.4. We work around this problem by ignoring these. */ 9611 if (strncmp (DW_STRING (attr), "._", 2) == 0 9612 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0) 9613 return NULL; 9614 break; 9615 9616 default: 9617 break; 9618 } 9619 9620 if (!DW_STRING_IS_CANONICAL (attr)) 9621 { 9622 DW_STRING (attr) 9623 = dwarf2_canonicalize_name (DW_STRING (attr), cu, 9624 &cu->objfile->objfile_obstack); 9625 DW_STRING_IS_CANONICAL (attr) = 1; 9626 } 9627 return DW_STRING (attr); 9628 } 9629 9630 /* Return the die that this die in an extension of, or NULL if there 9631 is none. *EXT_CU is the CU containing DIE on input, and the CU 9632 containing the return value on output. */ 9633 9634 static struct die_info * 9635 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu) 9636 { 9637 struct attribute *attr; 9638 9639 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu); 9640 if (attr == NULL) 9641 return NULL; 9642 9643 return follow_die_ref (die, attr, ext_cu); 9644 } 9645 9646 /* Convert a DIE tag into its string name. */ 9647 9648 static char * 9649 dwarf_tag_name (unsigned tag) 9650 { 9651 switch (tag) 9652 { 9653 case DW_TAG_padding: 9654 return "DW_TAG_padding"; 9655 case DW_TAG_array_type: 9656 return "DW_TAG_array_type"; 9657 case DW_TAG_class_type: 9658 return "DW_TAG_class_type"; 9659 case DW_TAG_entry_point: 9660 return "DW_TAG_entry_point"; 9661 case DW_TAG_enumeration_type: 9662 return "DW_TAG_enumeration_type"; 9663 case DW_TAG_formal_parameter: 9664 return "DW_TAG_formal_parameter"; 9665 case DW_TAG_imported_declaration: 9666 return "DW_TAG_imported_declaration"; 9667 case DW_TAG_label: 9668 return "DW_TAG_label"; 9669 case DW_TAG_lexical_block: 9670 return "DW_TAG_lexical_block"; 9671 case DW_TAG_member: 9672 return "DW_TAG_member"; 9673 case DW_TAG_pointer_type: 9674 return "DW_TAG_pointer_type"; 9675 case DW_TAG_reference_type: 9676 return "DW_TAG_reference_type"; 9677 case DW_TAG_compile_unit: 9678 return "DW_TAG_compile_unit"; 9679 case DW_TAG_string_type: 9680 return "DW_TAG_string_type"; 9681 case DW_TAG_structure_type: 9682 return "DW_TAG_structure_type"; 9683 case DW_TAG_subroutine_type: 9684 return "DW_TAG_subroutine_type"; 9685 case DW_TAG_typedef: 9686 return "DW_TAG_typedef"; 9687 case DW_TAG_union_type: 9688 return "DW_TAG_union_type"; 9689 case DW_TAG_unspecified_parameters: 9690 return "DW_TAG_unspecified_parameters"; 9691 case DW_TAG_variant: 9692 return "DW_TAG_variant"; 9693 case DW_TAG_common_block: 9694 return "DW_TAG_common_block"; 9695 case DW_TAG_common_inclusion: 9696 return "DW_TAG_common_inclusion"; 9697 case DW_TAG_inheritance: 9698 return "DW_TAG_inheritance"; 9699 case DW_TAG_inlined_subroutine: 9700 return "DW_TAG_inlined_subroutine"; 9701 case DW_TAG_module: 9702 return "DW_TAG_module"; 9703 case DW_TAG_ptr_to_member_type: 9704 return "DW_TAG_ptr_to_member_type"; 9705 case DW_TAG_set_type: 9706 return "DW_TAG_set_type"; 9707 case DW_TAG_subrange_type: 9708 return "DW_TAG_subrange_type"; 9709 case DW_TAG_with_stmt: 9710 return "DW_TAG_with_stmt"; 9711 case DW_TAG_access_declaration: 9712 return "DW_TAG_access_declaration"; 9713 case DW_TAG_base_type: 9714 return "DW_TAG_base_type"; 9715 case DW_TAG_catch_block: 9716 return "DW_TAG_catch_block"; 9717 case DW_TAG_const_type: 9718 return "DW_TAG_const_type"; 9719 case DW_TAG_constant: 9720 return "DW_TAG_constant"; 9721 case DW_TAG_enumerator: 9722 return "DW_TAG_enumerator"; 9723 case DW_TAG_file_type: 9724 return "DW_TAG_file_type"; 9725 case DW_TAG_friend: 9726 return "DW_TAG_friend"; 9727 case DW_TAG_namelist: 9728 return "DW_TAG_namelist"; 9729 case DW_TAG_namelist_item: 9730 return "DW_TAG_namelist_item"; 9731 case DW_TAG_packed_type: 9732 return "DW_TAG_packed_type"; 9733 case DW_TAG_subprogram: 9734 return "DW_TAG_subprogram"; 9735 case DW_TAG_template_type_param: 9736 return "DW_TAG_template_type_param"; 9737 case DW_TAG_template_value_param: 9738 return "DW_TAG_template_value_param"; 9739 case DW_TAG_thrown_type: 9740 return "DW_TAG_thrown_type"; 9741 case DW_TAG_try_block: 9742 return "DW_TAG_try_block"; 9743 case DW_TAG_variant_part: 9744 return "DW_TAG_variant_part"; 9745 case DW_TAG_variable: 9746 return "DW_TAG_variable"; 9747 case DW_TAG_volatile_type: 9748 return "DW_TAG_volatile_type"; 9749 case DW_TAG_dwarf_procedure: 9750 return "DW_TAG_dwarf_procedure"; 9751 case DW_TAG_restrict_type: 9752 return "DW_TAG_restrict_type"; 9753 case DW_TAG_interface_type: 9754 return "DW_TAG_interface_type"; 9755 case DW_TAG_namespace: 9756 return "DW_TAG_namespace"; 9757 case DW_TAG_imported_module: 9758 return "DW_TAG_imported_module"; 9759 case DW_TAG_unspecified_type: 9760 return "DW_TAG_unspecified_type"; 9761 case DW_TAG_partial_unit: 9762 return "DW_TAG_partial_unit"; 9763 case DW_TAG_imported_unit: 9764 return "DW_TAG_imported_unit"; 9765 case DW_TAG_condition: 9766 return "DW_TAG_condition"; 9767 case DW_TAG_shared_type: 9768 return "DW_TAG_shared_type"; 9769 case DW_TAG_type_unit: 9770 return "DW_TAG_type_unit"; 9771 case DW_TAG_MIPS_loop: 9772 return "DW_TAG_MIPS_loop"; 9773 case DW_TAG_HP_array_descriptor: 9774 return "DW_TAG_HP_array_descriptor"; 9775 case DW_TAG_format_label: 9776 return "DW_TAG_format_label"; 9777 case DW_TAG_function_template: 9778 return "DW_TAG_function_template"; 9779 case DW_TAG_class_template: 9780 return "DW_TAG_class_template"; 9781 case DW_TAG_GNU_BINCL: 9782 return "DW_TAG_GNU_BINCL"; 9783 case DW_TAG_GNU_EINCL: 9784 return "DW_TAG_GNU_EINCL"; 9785 case DW_TAG_upc_shared_type: 9786 return "DW_TAG_upc_shared_type"; 9787 case DW_TAG_upc_strict_type: 9788 return "DW_TAG_upc_strict_type"; 9789 case DW_TAG_upc_relaxed_type: 9790 return "DW_TAG_upc_relaxed_type"; 9791 case DW_TAG_PGI_kanji_type: 9792 return "DW_TAG_PGI_kanji_type"; 9793 case DW_TAG_PGI_interface_block: 9794 return "DW_TAG_PGI_interface_block"; 9795 default: 9796 return "DW_TAG_<unknown>"; 9797 } 9798 } 9799 9800 /* Convert a DWARF attribute code into its string name. */ 9801 9802 static char * 9803 dwarf_attr_name (unsigned attr) 9804 { 9805 switch (attr) 9806 { 9807 case DW_AT_sibling: 9808 return "DW_AT_sibling"; 9809 case DW_AT_location: 9810 return "DW_AT_location"; 9811 case DW_AT_name: 9812 return "DW_AT_name"; 9813 case DW_AT_ordering: 9814 return "DW_AT_ordering"; 9815 case DW_AT_subscr_data: 9816 return "DW_AT_subscr_data"; 9817 case DW_AT_byte_size: 9818 return "DW_AT_byte_size"; 9819 case DW_AT_bit_offset: 9820 return "DW_AT_bit_offset"; 9821 case DW_AT_bit_size: 9822 return "DW_AT_bit_size"; 9823 case DW_AT_element_list: 9824 return "DW_AT_element_list"; 9825 case DW_AT_stmt_list: 9826 return "DW_AT_stmt_list"; 9827 case DW_AT_low_pc: 9828 return "DW_AT_low_pc"; 9829 case DW_AT_high_pc: 9830 return "DW_AT_high_pc"; 9831 case DW_AT_language: 9832 return "DW_AT_language"; 9833 case DW_AT_member: 9834 return "DW_AT_member"; 9835 case DW_AT_discr: 9836 return "DW_AT_discr"; 9837 case DW_AT_discr_value: 9838 return "DW_AT_discr_value"; 9839 case DW_AT_visibility: 9840 return "DW_AT_visibility"; 9841 case DW_AT_import: 9842 return "DW_AT_import"; 9843 case DW_AT_string_length: 9844 return "DW_AT_string_length"; 9845 case DW_AT_common_reference: 9846 return "DW_AT_common_reference"; 9847 case DW_AT_comp_dir: 9848 return "DW_AT_comp_dir"; 9849 case DW_AT_const_value: 9850 return "DW_AT_const_value"; 9851 case DW_AT_containing_type: 9852 return "DW_AT_containing_type"; 9853 case DW_AT_default_value: 9854 return "DW_AT_default_value"; 9855 case DW_AT_inline: 9856 return "DW_AT_inline"; 9857 case DW_AT_is_optional: 9858 return "DW_AT_is_optional"; 9859 case DW_AT_lower_bound: 9860 return "DW_AT_lower_bound"; 9861 case DW_AT_producer: 9862 return "DW_AT_producer"; 9863 case DW_AT_prototyped: 9864 return "DW_AT_prototyped"; 9865 case DW_AT_return_addr: 9866 return "DW_AT_return_addr"; 9867 case DW_AT_start_scope: 9868 return "DW_AT_start_scope"; 9869 case DW_AT_bit_stride: 9870 return "DW_AT_bit_stride"; 9871 case DW_AT_upper_bound: 9872 return "DW_AT_upper_bound"; 9873 case DW_AT_abstract_origin: 9874 return "DW_AT_abstract_origin"; 9875 case DW_AT_accessibility: 9876 return "DW_AT_accessibility"; 9877 case DW_AT_address_class: 9878 return "DW_AT_address_class"; 9879 case DW_AT_artificial: 9880 return "DW_AT_artificial"; 9881 case DW_AT_base_types: 9882 return "DW_AT_base_types"; 9883 case DW_AT_calling_convention: 9884 return "DW_AT_calling_convention"; 9885 case DW_AT_count: 9886 return "DW_AT_count"; 9887 case DW_AT_data_member_location: 9888 return "DW_AT_data_member_location"; 9889 case DW_AT_decl_column: 9890 return "DW_AT_decl_column"; 9891 case DW_AT_decl_file: 9892 return "DW_AT_decl_file"; 9893 case DW_AT_decl_line: 9894 return "DW_AT_decl_line"; 9895 case DW_AT_declaration: 9896 return "DW_AT_declaration"; 9897 case DW_AT_discr_list: 9898 return "DW_AT_discr_list"; 9899 case DW_AT_encoding: 9900 return "DW_AT_encoding"; 9901 case DW_AT_external: 9902 return "DW_AT_external"; 9903 case DW_AT_frame_base: 9904 return "DW_AT_frame_base"; 9905 case DW_AT_friend: 9906 return "DW_AT_friend"; 9907 case DW_AT_identifier_case: 9908 return "DW_AT_identifier_case"; 9909 case DW_AT_macro_info: 9910 return "DW_AT_macro_info"; 9911 case DW_AT_namelist_items: 9912 return "DW_AT_namelist_items"; 9913 case DW_AT_priority: 9914 return "DW_AT_priority"; 9915 case DW_AT_segment: 9916 return "DW_AT_segment"; 9917 case DW_AT_specification: 9918 return "DW_AT_specification"; 9919 case DW_AT_static_link: 9920 return "DW_AT_static_link"; 9921 case DW_AT_type: 9922 return "DW_AT_type"; 9923 case DW_AT_use_location: 9924 return "DW_AT_use_location"; 9925 case DW_AT_variable_parameter: 9926 return "DW_AT_variable_parameter"; 9927 case DW_AT_virtuality: 9928 return "DW_AT_virtuality"; 9929 case DW_AT_vtable_elem_location: 9930 return "DW_AT_vtable_elem_location"; 9931 /* DWARF 3 values. */ 9932 case DW_AT_allocated: 9933 return "DW_AT_allocated"; 9934 case DW_AT_associated: 9935 return "DW_AT_associated"; 9936 case DW_AT_data_location: 9937 return "DW_AT_data_location"; 9938 case DW_AT_byte_stride: 9939 return "DW_AT_byte_stride"; 9940 case DW_AT_entry_pc: 9941 return "DW_AT_entry_pc"; 9942 case DW_AT_use_UTF8: 9943 return "DW_AT_use_UTF8"; 9944 case DW_AT_extension: 9945 return "DW_AT_extension"; 9946 case DW_AT_ranges: 9947 return "DW_AT_ranges"; 9948 case DW_AT_trampoline: 9949 return "DW_AT_trampoline"; 9950 case DW_AT_call_column: 9951 return "DW_AT_call_column"; 9952 case DW_AT_call_file: 9953 return "DW_AT_call_file"; 9954 case DW_AT_call_line: 9955 return "DW_AT_call_line"; 9956 case DW_AT_description: 9957 return "DW_AT_description"; 9958 case DW_AT_binary_scale: 9959 return "DW_AT_binary_scale"; 9960 case DW_AT_decimal_scale: 9961 return "DW_AT_decimal_scale"; 9962 case DW_AT_small: 9963 return "DW_AT_small"; 9964 case DW_AT_decimal_sign: 9965 return "DW_AT_decimal_sign"; 9966 case DW_AT_digit_count: 9967 return "DW_AT_digit_count"; 9968 case DW_AT_picture_string: 9969 return "DW_AT_picture_string"; 9970 case DW_AT_mutable: 9971 return "DW_AT_mutable"; 9972 case DW_AT_threads_scaled: 9973 return "DW_AT_threads_scaled"; 9974 case DW_AT_explicit: 9975 return "DW_AT_explicit"; 9976 case DW_AT_object_pointer: 9977 return "DW_AT_object_pointer"; 9978 case DW_AT_endianity: 9979 return "DW_AT_endianity"; 9980 case DW_AT_elemental: 9981 return "DW_AT_elemental"; 9982 case DW_AT_pure: 9983 return "DW_AT_pure"; 9984 case DW_AT_recursive: 9985 return "DW_AT_recursive"; 9986 /* DWARF 4 values. */ 9987 case DW_AT_signature: 9988 return "DW_AT_signature"; 9989 case DW_AT_linkage_name: 9990 return "DW_AT_linkage_name"; 9991 /* SGI/MIPS extensions. */ 9992 #ifdef MIPS /* collides with DW_AT_HP_block_index */ 9993 case DW_AT_MIPS_fde: 9994 return "DW_AT_MIPS_fde"; 9995 #endif 9996 case DW_AT_MIPS_loop_begin: 9997 return "DW_AT_MIPS_loop_begin"; 9998 case DW_AT_MIPS_tail_loop_begin: 9999 return "DW_AT_MIPS_tail_loop_begin"; 10000 case DW_AT_MIPS_epilog_begin: 10001 return "DW_AT_MIPS_epilog_begin"; 10002 case DW_AT_MIPS_loop_unroll_factor: 10003 return "DW_AT_MIPS_loop_unroll_factor"; 10004 case DW_AT_MIPS_software_pipeline_depth: 10005 return "DW_AT_MIPS_software_pipeline_depth"; 10006 case DW_AT_MIPS_linkage_name: 10007 return "DW_AT_MIPS_linkage_name"; 10008 case DW_AT_MIPS_stride: 10009 return "DW_AT_MIPS_stride"; 10010 case DW_AT_MIPS_abstract_name: 10011 return "DW_AT_MIPS_abstract_name"; 10012 case DW_AT_MIPS_clone_origin: 10013 return "DW_AT_MIPS_clone_origin"; 10014 case DW_AT_MIPS_has_inlines: 10015 return "DW_AT_MIPS_has_inlines"; 10016 /* HP extensions. */ 10017 #ifndef MIPS /* collides with DW_AT_MIPS_fde */ 10018 case DW_AT_HP_block_index: 10019 return "DW_AT_HP_block_index"; 10020 #endif 10021 case DW_AT_HP_unmodifiable: 10022 return "DW_AT_HP_unmodifiable"; 10023 case DW_AT_HP_actuals_stmt_list: 10024 return "DW_AT_HP_actuals_stmt_list"; 10025 case DW_AT_HP_proc_per_section: 10026 return "DW_AT_HP_proc_per_section"; 10027 case DW_AT_HP_raw_data_ptr: 10028 return "DW_AT_HP_raw_data_ptr"; 10029 case DW_AT_HP_pass_by_reference: 10030 return "DW_AT_HP_pass_by_reference"; 10031 case DW_AT_HP_opt_level: 10032 return "DW_AT_HP_opt_level"; 10033 case DW_AT_HP_prof_version_id: 10034 return "DW_AT_HP_prof_version_id"; 10035 case DW_AT_HP_opt_flags: 10036 return "DW_AT_HP_opt_flags"; 10037 case DW_AT_HP_cold_region_low_pc: 10038 return "DW_AT_HP_cold_region_low_pc"; 10039 case DW_AT_HP_cold_region_high_pc: 10040 return "DW_AT_HP_cold_region_high_pc"; 10041 case DW_AT_HP_all_variables_modifiable: 10042 return "DW_AT_HP_all_variables_modifiable"; 10043 case DW_AT_HP_linkage_name: 10044 return "DW_AT_HP_linkage_name"; 10045 case DW_AT_HP_prof_flags: 10046 return "DW_AT_HP_prof_flags"; 10047 /* GNU extensions. */ 10048 case DW_AT_sf_names: 10049 return "DW_AT_sf_names"; 10050 case DW_AT_src_info: 10051 return "DW_AT_src_info"; 10052 case DW_AT_mac_info: 10053 return "DW_AT_mac_info"; 10054 case DW_AT_src_coords: 10055 return "DW_AT_src_coords"; 10056 case DW_AT_body_begin: 10057 return "DW_AT_body_begin"; 10058 case DW_AT_body_end: 10059 return "DW_AT_body_end"; 10060 case DW_AT_GNU_vector: 10061 return "DW_AT_GNU_vector"; 10062 /* VMS extensions. */ 10063 case DW_AT_VMS_rtnbeg_pd_address: 10064 return "DW_AT_VMS_rtnbeg_pd_address"; 10065 /* UPC extension. */ 10066 case DW_AT_upc_threads_scaled: 10067 return "DW_AT_upc_threads_scaled"; 10068 /* PGI (STMicroelectronics) extensions. */ 10069 case DW_AT_PGI_lbase: 10070 return "DW_AT_PGI_lbase"; 10071 case DW_AT_PGI_soffset: 10072 return "DW_AT_PGI_soffset"; 10073 case DW_AT_PGI_lstride: 10074 return "DW_AT_PGI_lstride"; 10075 default: 10076 return "DW_AT_<unknown>"; 10077 } 10078 } 10079 10080 /* Convert a DWARF value form code into its string name. */ 10081 10082 static char * 10083 dwarf_form_name (unsigned form) 10084 { 10085 switch (form) 10086 { 10087 case DW_FORM_addr: 10088 return "DW_FORM_addr"; 10089 case DW_FORM_block2: 10090 return "DW_FORM_block2"; 10091 case DW_FORM_block4: 10092 return "DW_FORM_block4"; 10093 case DW_FORM_data2: 10094 return "DW_FORM_data2"; 10095 case DW_FORM_data4: 10096 return "DW_FORM_data4"; 10097 case DW_FORM_data8: 10098 return "DW_FORM_data8"; 10099 case DW_FORM_string: 10100 return "DW_FORM_string"; 10101 case DW_FORM_block: 10102 return "DW_FORM_block"; 10103 case DW_FORM_block1: 10104 return "DW_FORM_block1"; 10105 case DW_FORM_data1: 10106 return "DW_FORM_data1"; 10107 case DW_FORM_flag: 10108 return "DW_FORM_flag"; 10109 case DW_FORM_sdata: 10110 return "DW_FORM_sdata"; 10111 case DW_FORM_strp: 10112 return "DW_FORM_strp"; 10113 case DW_FORM_udata: 10114 return "DW_FORM_udata"; 10115 case DW_FORM_ref_addr: 10116 return "DW_FORM_ref_addr"; 10117 case DW_FORM_ref1: 10118 return "DW_FORM_ref1"; 10119 case DW_FORM_ref2: 10120 return "DW_FORM_ref2"; 10121 case DW_FORM_ref4: 10122 return "DW_FORM_ref4"; 10123 case DW_FORM_ref8: 10124 return "DW_FORM_ref8"; 10125 case DW_FORM_ref_udata: 10126 return "DW_FORM_ref_udata"; 10127 case DW_FORM_indirect: 10128 return "DW_FORM_indirect"; 10129 case DW_FORM_sec_offset: 10130 return "DW_FORM_sec_offset"; 10131 case DW_FORM_exprloc: 10132 return "DW_FORM_exprloc"; 10133 case DW_FORM_flag_present: 10134 return "DW_FORM_flag_present"; 10135 case DW_FORM_sig8: 10136 return "DW_FORM_sig8"; 10137 default: 10138 return "DW_FORM_<unknown>"; 10139 } 10140 } 10141 10142 /* Convert a DWARF stack opcode into its string name. */ 10143 10144 const char * 10145 dwarf_stack_op_name (unsigned op, int def) 10146 { 10147 switch (op) 10148 { 10149 case DW_OP_addr: 10150 return "DW_OP_addr"; 10151 case DW_OP_deref: 10152 return "DW_OP_deref"; 10153 case DW_OP_const1u: 10154 return "DW_OP_const1u"; 10155 case DW_OP_const1s: 10156 return "DW_OP_const1s"; 10157 case DW_OP_const2u: 10158 return "DW_OP_const2u"; 10159 case DW_OP_const2s: 10160 return "DW_OP_const2s"; 10161 case DW_OP_const4u: 10162 return "DW_OP_const4u"; 10163 case DW_OP_const4s: 10164 return "DW_OP_const4s"; 10165 case DW_OP_const8u: 10166 return "DW_OP_const8u"; 10167 case DW_OP_const8s: 10168 return "DW_OP_const8s"; 10169 case DW_OP_constu: 10170 return "DW_OP_constu"; 10171 case DW_OP_consts: 10172 return "DW_OP_consts"; 10173 case DW_OP_dup: 10174 return "DW_OP_dup"; 10175 case DW_OP_drop: 10176 return "DW_OP_drop"; 10177 case DW_OP_over: 10178 return "DW_OP_over"; 10179 case DW_OP_pick: 10180 return "DW_OP_pick"; 10181 case DW_OP_swap: 10182 return "DW_OP_swap"; 10183 case DW_OP_rot: 10184 return "DW_OP_rot"; 10185 case DW_OP_xderef: 10186 return "DW_OP_xderef"; 10187 case DW_OP_abs: 10188 return "DW_OP_abs"; 10189 case DW_OP_and: 10190 return "DW_OP_and"; 10191 case DW_OP_div: 10192 return "DW_OP_div"; 10193 case DW_OP_minus: 10194 return "DW_OP_minus"; 10195 case DW_OP_mod: 10196 return "DW_OP_mod"; 10197 case DW_OP_mul: 10198 return "DW_OP_mul"; 10199 case DW_OP_neg: 10200 return "DW_OP_neg"; 10201 case DW_OP_not: 10202 return "DW_OP_not"; 10203 case DW_OP_or: 10204 return "DW_OP_or"; 10205 case DW_OP_plus: 10206 return "DW_OP_plus"; 10207 case DW_OP_plus_uconst: 10208 return "DW_OP_plus_uconst"; 10209 case DW_OP_shl: 10210 return "DW_OP_shl"; 10211 case DW_OP_shr: 10212 return "DW_OP_shr"; 10213 case DW_OP_shra: 10214 return "DW_OP_shra"; 10215 case DW_OP_xor: 10216 return "DW_OP_xor"; 10217 case DW_OP_bra: 10218 return "DW_OP_bra"; 10219 case DW_OP_eq: 10220 return "DW_OP_eq"; 10221 case DW_OP_ge: 10222 return "DW_OP_ge"; 10223 case DW_OP_gt: 10224 return "DW_OP_gt"; 10225 case DW_OP_le: 10226 return "DW_OP_le"; 10227 case DW_OP_lt: 10228 return "DW_OP_lt"; 10229 case DW_OP_ne: 10230 return "DW_OP_ne"; 10231 case DW_OP_skip: 10232 return "DW_OP_skip"; 10233 case DW_OP_lit0: 10234 return "DW_OP_lit0"; 10235 case DW_OP_lit1: 10236 return "DW_OP_lit1"; 10237 case DW_OP_lit2: 10238 return "DW_OP_lit2"; 10239 case DW_OP_lit3: 10240 return "DW_OP_lit3"; 10241 case DW_OP_lit4: 10242 return "DW_OP_lit4"; 10243 case DW_OP_lit5: 10244 return "DW_OP_lit5"; 10245 case DW_OP_lit6: 10246 return "DW_OP_lit6"; 10247 case DW_OP_lit7: 10248 return "DW_OP_lit7"; 10249 case DW_OP_lit8: 10250 return "DW_OP_lit8"; 10251 case DW_OP_lit9: 10252 return "DW_OP_lit9"; 10253 case DW_OP_lit10: 10254 return "DW_OP_lit10"; 10255 case DW_OP_lit11: 10256 return "DW_OP_lit11"; 10257 case DW_OP_lit12: 10258 return "DW_OP_lit12"; 10259 case DW_OP_lit13: 10260 return "DW_OP_lit13"; 10261 case DW_OP_lit14: 10262 return "DW_OP_lit14"; 10263 case DW_OP_lit15: 10264 return "DW_OP_lit15"; 10265 case DW_OP_lit16: 10266 return "DW_OP_lit16"; 10267 case DW_OP_lit17: 10268 return "DW_OP_lit17"; 10269 case DW_OP_lit18: 10270 return "DW_OP_lit18"; 10271 case DW_OP_lit19: 10272 return "DW_OP_lit19"; 10273 case DW_OP_lit20: 10274 return "DW_OP_lit20"; 10275 case DW_OP_lit21: 10276 return "DW_OP_lit21"; 10277 case DW_OP_lit22: 10278 return "DW_OP_lit22"; 10279 case DW_OP_lit23: 10280 return "DW_OP_lit23"; 10281 case DW_OP_lit24: 10282 return "DW_OP_lit24"; 10283 case DW_OP_lit25: 10284 return "DW_OP_lit25"; 10285 case DW_OP_lit26: 10286 return "DW_OP_lit26"; 10287 case DW_OP_lit27: 10288 return "DW_OP_lit27"; 10289 case DW_OP_lit28: 10290 return "DW_OP_lit28"; 10291 case DW_OP_lit29: 10292 return "DW_OP_lit29"; 10293 case DW_OP_lit30: 10294 return "DW_OP_lit30"; 10295 case DW_OP_lit31: 10296 return "DW_OP_lit31"; 10297 case DW_OP_reg0: 10298 return "DW_OP_reg0"; 10299 case DW_OP_reg1: 10300 return "DW_OP_reg1"; 10301 case DW_OP_reg2: 10302 return "DW_OP_reg2"; 10303 case DW_OP_reg3: 10304 return "DW_OP_reg3"; 10305 case DW_OP_reg4: 10306 return "DW_OP_reg4"; 10307 case DW_OP_reg5: 10308 return "DW_OP_reg5"; 10309 case DW_OP_reg6: 10310 return "DW_OP_reg6"; 10311 case DW_OP_reg7: 10312 return "DW_OP_reg7"; 10313 case DW_OP_reg8: 10314 return "DW_OP_reg8"; 10315 case DW_OP_reg9: 10316 return "DW_OP_reg9"; 10317 case DW_OP_reg10: 10318 return "DW_OP_reg10"; 10319 case DW_OP_reg11: 10320 return "DW_OP_reg11"; 10321 case DW_OP_reg12: 10322 return "DW_OP_reg12"; 10323 case DW_OP_reg13: 10324 return "DW_OP_reg13"; 10325 case DW_OP_reg14: 10326 return "DW_OP_reg14"; 10327 case DW_OP_reg15: 10328 return "DW_OP_reg15"; 10329 case DW_OP_reg16: 10330 return "DW_OP_reg16"; 10331 case DW_OP_reg17: 10332 return "DW_OP_reg17"; 10333 case DW_OP_reg18: 10334 return "DW_OP_reg18"; 10335 case DW_OP_reg19: 10336 return "DW_OP_reg19"; 10337 case DW_OP_reg20: 10338 return "DW_OP_reg20"; 10339 case DW_OP_reg21: 10340 return "DW_OP_reg21"; 10341 case DW_OP_reg22: 10342 return "DW_OP_reg22"; 10343 case DW_OP_reg23: 10344 return "DW_OP_reg23"; 10345 case DW_OP_reg24: 10346 return "DW_OP_reg24"; 10347 case DW_OP_reg25: 10348 return "DW_OP_reg25"; 10349 case DW_OP_reg26: 10350 return "DW_OP_reg26"; 10351 case DW_OP_reg27: 10352 return "DW_OP_reg27"; 10353 case DW_OP_reg28: 10354 return "DW_OP_reg28"; 10355 case DW_OP_reg29: 10356 return "DW_OP_reg29"; 10357 case DW_OP_reg30: 10358 return "DW_OP_reg30"; 10359 case DW_OP_reg31: 10360 return "DW_OP_reg31"; 10361 case DW_OP_breg0: 10362 return "DW_OP_breg0"; 10363 case DW_OP_breg1: 10364 return "DW_OP_breg1"; 10365 case DW_OP_breg2: 10366 return "DW_OP_breg2"; 10367 case DW_OP_breg3: 10368 return "DW_OP_breg3"; 10369 case DW_OP_breg4: 10370 return "DW_OP_breg4"; 10371 case DW_OP_breg5: 10372 return "DW_OP_breg5"; 10373 case DW_OP_breg6: 10374 return "DW_OP_breg6"; 10375 case DW_OP_breg7: 10376 return "DW_OP_breg7"; 10377 case DW_OP_breg8: 10378 return "DW_OP_breg8"; 10379 case DW_OP_breg9: 10380 return "DW_OP_breg9"; 10381 case DW_OP_breg10: 10382 return "DW_OP_breg10"; 10383 case DW_OP_breg11: 10384 return "DW_OP_breg11"; 10385 case DW_OP_breg12: 10386 return "DW_OP_breg12"; 10387 case DW_OP_breg13: 10388 return "DW_OP_breg13"; 10389 case DW_OP_breg14: 10390 return "DW_OP_breg14"; 10391 case DW_OP_breg15: 10392 return "DW_OP_breg15"; 10393 case DW_OP_breg16: 10394 return "DW_OP_breg16"; 10395 case DW_OP_breg17: 10396 return "DW_OP_breg17"; 10397 case DW_OP_breg18: 10398 return "DW_OP_breg18"; 10399 case DW_OP_breg19: 10400 return "DW_OP_breg19"; 10401 case DW_OP_breg20: 10402 return "DW_OP_breg20"; 10403 case DW_OP_breg21: 10404 return "DW_OP_breg21"; 10405 case DW_OP_breg22: 10406 return "DW_OP_breg22"; 10407 case DW_OP_breg23: 10408 return "DW_OP_breg23"; 10409 case DW_OP_breg24: 10410 return "DW_OP_breg24"; 10411 case DW_OP_breg25: 10412 return "DW_OP_breg25"; 10413 case DW_OP_breg26: 10414 return "DW_OP_breg26"; 10415 case DW_OP_breg27: 10416 return "DW_OP_breg27"; 10417 case DW_OP_breg28: 10418 return "DW_OP_breg28"; 10419 case DW_OP_breg29: 10420 return "DW_OP_breg29"; 10421 case DW_OP_breg30: 10422 return "DW_OP_breg30"; 10423 case DW_OP_breg31: 10424 return "DW_OP_breg31"; 10425 case DW_OP_regx: 10426 return "DW_OP_regx"; 10427 case DW_OP_fbreg: 10428 return "DW_OP_fbreg"; 10429 case DW_OP_bregx: 10430 return "DW_OP_bregx"; 10431 case DW_OP_piece: 10432 return "DW_OP_piece"; 10433 case DW_OP_deref_size: 10434 return "DW_OP_deref_size"; 10435 case DW_OP_xderef_size: 10436 return "DW_OP_xderef_size"; 10437 case DW_OP_nop: 10438 return "DW_OP_nop"; 10439 /* DWARF 3 extensions. */ 10440 case DW_OP_push_object_address: 10441 return "DW_OP_push_object_address"; 10442 case DW_OP_call2: 10443 return "DW_OP_call2"; 10444 case DW_OP_call4: 10445 return "DW_OP_call4"; 10446 case DW_OP_call_ref: 10447 return "DW_OP_call_ref"; 10448 case DW_OP_form_tls_address: 10449 return "DW_OP_form_tls_address"; 10450 case DW_OP_call_frame_cfa: 10451 return "DW_OP_call_frame_cfa"; 10452 case DW_OP_bit_piece: 10453 return "DW_OP_bit_piece"; 10454 /* DWARF 4 extensions. */ 10455 case DW_OP_implicit_value: 10456 return "DW_OP_implicit_value"; 10457 case DW_OP_stack_value: 10458 return "DW_OP_stack_value"; 10459 /* GNU extensions. */ 10460 case DW_OP_GNU_push_tls_address: 10461 return "DW_OP_GNU_push_tls_address"; 10462 case DW_OP_GNU_uninit: 10463 return "DW_OP_GNU_uninit"; 10464 default: 10465 return def ? "OP_<unknown>" : NULL; 10466 } 10467 } 10468 10469 static char * 10470 dwarf_bool_name (unsigned mybool) 10471 { 10472 if (mybool) 10473 return "TRUE"; 10474 else 10475 return "FALSE"; 10476 } 10477 10478 /* Convert a DWARF type code into its string name. */ 10479 10480 static char * 10481 dwarf_type_encoding_name (unsigned enc) 10482 { 10483 switch (enc) 10484 { 10485 case DW_ATE_void: 10486 return "DW_ATE_void"; 10487 case DW_ATE_address: 10488 return "DW_ATE_address"; 10489 case DW_ATE_boolean: 10490 return "DW_ATE_boolean"; 10491 case DW_ATE_complex_float: 10492 return "DW_ATE_complex_float"; 10493 case DW_ATE_float: 10494 return "DW_ATE_float"; 10495 case DW_ATE_signed: 10496 return "DW_ATE_signed"; 10497 case DW_ATE_signed_char: 10498 return "DW_ATE_signed_char"; 10499 case DW_ATE_unsigned: 10500 return "DW_ATE_unsigned"; 10501 case DW_ATE_unsigned_char: 10502 return "DW_ATE_unsigned_char"; 10503 /* DWARF 3. */ 10504 case DW_ATE_imaginary_float: 10505 return "DW_ATE_imaginary_float"; 10506 case DW_ATE_packed_decimal: 10507 return "DW_ATE_packed_decimal"; 10508 case DW_ATE_numeric_string: 10509 return "DW_ATE_numeric_string"; 10510 case DW_ATE_edited: 10511 return "DW_ATE_edited"; 10512 case DW_ATE_signed_fixed: 10513 return "DW_ATE_signed_fixed"; 10514 case DW_ATE_unsigned_fixed: 10515 return "DW_ATE_unsigned_fixed"; 10516 case DW_ATE_decimal_float: 10517 return "DW_ATE_decimal_float"; 10518 /* DWARF 4. */ 10519 case DW_ATE_UTF: 10520 return "DW_ATE_UTF"; 10521 /* HP extensions. */ 10522 case DW_ATE_HP_float80: 10523 return "DW_ATE_HP_float80"; 10524 case DW_ATE_HP_complex_float80: 10525 return "DW_ATE_HP_complex_float80"; 10526 case DW_ATE_HP_float128: 10527 return "DW_ATE_HP_float128"; 10528 case DW_ATE_HP_complex_float128: 10529 return "DW_ATE_HP_complex_float128"; 10530 case DW_ATE_HP_floathpintel: 10531 return "DW_ATE_HP_floathpintel"; 10532 case DW_ATE_HP_imaginary_float80: 10533 return "DW_ATE_HP_imaginary_float80"; 10534 case DW_ATE_HP_imaginary_float128: 10535 return "DW_ATE_HP_imaginary_float128"; 10536 default: 10537 return "DW_ATE_<unknown>"; 10538 } 10539 } 10540 10541 /* Convert a DWARF call frame info operation to its string name. */ 10542 10543 #if 0 10544 static char * 10545 dwarf_cfi_name (unsigned cfi_opc) 10546 { 10547 switch (cfi_opc) 10548 { 10549 case DW_CFA_advance_loc: 10550 return "DW_CFA_advance_loc"; 10551 case DW_CFA_offset: 10552 return "DW_CFA_offset"; 10553 case DW_CFA_restore: 10554 return "DW_CFA_restore"; 10555 case DW_CFA_nop: 10556 return "DW_CFA_nop"; 10557 case DW_CFA_set_loc: 10558 return "DW_CFA_set_loc"; 10559 case DW_CFA_advance_loc1: 10560 return "DW_CFA_advance_loc1"; 10561 case DW_CFA_advance_loc2: 10562 return "DW_CFA_advance_loc2"; 10563 case DW_CFA_advance_loc4: 10564 return "DW_CFA_advance_loc4"; 10565 case DW_CFA_offset_extended: 10566 return "DW_CFA_offset_extended"; 10567 case DW_CFA_restore_extended: 10568 return "DW_CFA_restore_extended"; 10569 case DW_CFA_undefined: 10570 return "DW_CFA_undefined"; 10571 case DW_CFA_same_value: 10572 return "DW_CFA_same_value"; 10573 case DW_CFA_register: 10574 return "DW_CFA_register"; 10575 case DW_CFA_remember_state: 10576 return "DW_CFA_remember_state"; 10577 case DW_CFA_restore_state: 10578 return "DW_CFA_restore_state"; 10579 case DW_CFA_def_cfa: 10580 return "DW_CFA_def_cfa"; 10581 case DW_CFA_def_cfa_register: 10582 return "DW_CFA_def_cfa_register"; 10583 case DW_CFA_def_cfa_offset: 10584 return "DW_CFA_def_cfa_offset"; 10585 /* DWARF 3. */ 10586 case DW_CFA_def_cfa_expression: 10587 return "DW_CFA_def_cfa_expression"; 10588 case DW_CFA_expression: 10589 return "DW_CFA_expression"; 10590 case DW_CFA_offset_extended_sf: 10591 return "DW_CFA_offset_extended_sf"; 10592 case DW_CFA_def_cfa_sf: 10593 return "DW_CFA_def_cfa_sf"; 10594 case DW_CFA_def_cfa_offset_sf: 10595 return "DW_CFA_def_cfa_offset_sf"; 10596 case DW_CFA_val_offset: 10597 return "DW_CFA_val_offset"; 10598 case DW_CFA_val_offset_sf: 10599 return "DW_CFA_val_offset_sf"; 10600 case DW_CFA_val_expression: 10601 return "DW_CFA_val_expression"; 10602 /* SGI/MIPS specific. */ 10603 case DW_CFA_MIPS_advance_loc8: 10604 return "DW_CFA_MIPS_advance_loc8"; 10605 /* GNU extensions. */ 10606 case DW_CFA_GNU_window_save: 10607 return "DW_CFA_GNU_window_save"; 10608 case DW_CFA_GNU_args_size: 10609 return "DW_CFA_GNU_args_size"; 10610 case DW_CFA_GNU_negative_offset_extended: 10611 return "DW_CFA_GNU_negative_offset_extended"; 10612 default: 10613 return "DW_CFA_<unknown>"; 10614 } 10615 } 10616 #endif 10617 10618 static void 10619 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die) 10620 { 10621 unsigned int i; 10622 10623 print_spaces (indent, f); 10624 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n", 10625 dwarf_tag_name (die->tag), die->abbrev, die->offset); 10626 10627 if (die->parent != NULL) 10628 { 10629 print_spaces (indent, f); 10630 fprintf_unfiltered (f, " parent at offset: 0x%x\n", 10631 die->parent->offset); 10632 } 10633 10634 print_spaces (indent, f); 10635 fprintf_unfiltered (f, " has children: %s\n", 10636 dwarf_bool_name (die->child != NULL)); 10637 10638 print_spaces (indent, f); 10639 fprintf_unfiltered (f, " attributes:\n"); 10640 10641 for (i = 0; i < die->num_attrs; ++i) 10642 { 10643 print_spaces (indent, f); 10644 fprintf_unfiltered (f, " %s (%s) ", 10645 dwarf_attr_name (die->attrs[i].name), 10646 dwarf_form_name (die->attrs[i].form)); 10647 10648 switch (die->attrs[i].form) 10649 { 10650 case DW_FORM_ref_addr: 10651 case DW_FORM_addr: 10652 fprintf_unfiltered (f, "address: "); 10653 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f); 10654 break; 10655 case DW_FORM_block2: 10656 case DW_FORM_block4: 10657 case DW_FORM_block: 10658 case DW_FORM_block1: 10659 fprintf_unfiltered (f, "block: size %d", DW_BLOCK (&die->attrs[i])->size); 10660 break; 10661 case DW_FORM_exprloc: 10662 fprintf_unfiltered (f, "expression: size %u", 10663 DW_BLOCK (&die->attrs[i])->size); 10664 break; 10665 case DW_FORM_ref1: 10666 case DW_FORM_ref2: 10667 case DW_FORM_ref4: 10668 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)", 10669 (long) (DW_ADDR (&die->attrs[i]))); 10670 break; 10671 case DW_FORM_data1: 10672 case DW_FORM_data2: 10673 case DW_FORM_data4: 10674 case DW_FORM_data8: 10675 case DW_FORM_udata: 10676 case DW_FORM_sdata: 10677 fprintf_unfiltered (f, "constant: %s", 10678 pulongest (DW_UNSND (&die->attrs[i]))); 10679 break; 10680 case DW_FORM_sec_offset: 10681 fprintf_unfiltered (f, "section offset: %s", 10682 pulongest (DW_UNSND (&die->attrs[i]))); 10683 break; 10684 case DW_FORM_sig8: 10685 if (DW_SIGNATURED_TYPE (&die->attrs[i]) != NULL) 10686 fprintf_unfiltered (f, "signatured type, offset: 0x%x", 10687 DW_SIGNATURED_TYPE (&die->attrs[i])->offset); 10688 else 10689 fprintf_unfiltered (f, "signatured type, offset: unknown"); 10690 break; 10691 case DW_FORM_string: 10692 case DW_FORM_strp: 10693 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)", 10694 DW_STRING (&die->attrs[i]) 10695 ? DW_STRING (&die->attrs[i]) : "", 10696 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not"); 10697 break; 10698 case DW_FORM_flag: 10699 if (DW_UNSND (&die->attrs[i])) 10700 fprintf_unfiltered (f, "flag: TRUE"); 10701 else 10702 fprintf_unfiltered (f, "flag: FALSE"); 10703 break; 10704 case DW_FORM_flag_present: 10705 fprintf_unfiltered (f, "flag: TRUE"); 10706 break; 10707 case DW_FORM_indirect: 10708 /* the reader will have reduced the indirect form to 10709 the "base form" so this form should not occur */ 10710 fprintf_unfiltered (f, "unexpected attribute form: DW_FORM_indirect"); 10711 break; 10712 default: 10713 fprintf_unfiltered (f, "unsupported attribute form: %d.", 10714 die->attrs[i].form); 10715 break; 10716 } 10717 fprintf_unfiltered (f, "\n"); 10718 } 10719 } 10720 10721 static void 10722 dump_die_for_error (struct die_info *die) 10723 { 10724 dump_die_shallow (gdb_stderr, 0, die); 10725 } 10726 10727 static void 10728 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die) 10729 { 10730 int indent = level * 4; 10731 10732 gdb_assert (die != NULL); 10733 10734 if (level >= max_level) 10735 return; 10736 10737 dump_die_shallow (f, indent, die); 10738 10739 if (die->child != NULL) 10740 { 10741 print_spaces (indent, f); 10742 fprintf_unfiltered (f, " Children:"); 10743 if (level + 1 < max_level) 10744 { 10745 fprintf_unfiltered (f, "\n"); 10746 dump_die_1 (f, level + 1, max_level, die->child); 10747 } 10748 else 10749 { 10750 fprintf_unfiltered (f, " [not printed, max nesting level reached]\n"); 10751 } 10752 } 10753 10754 if (die->sibling != NULL && level > 0) 10755 { 10756 dump_die_1 (f, level, max_level, die->sibling); 10757 } 10758 } 10759 10760 /* This is called from the pdie macro in gdbinit.in. 10761 It's not static so gcc will keep a copy callable from gdb. */ 10762 10763 void 10764 dump_die (struct die_info *die, int max_level) 10765 { 10766 dump_die_1 (gdb_stdlog, 0, max_level, die); 10767 } 10768 10769 static void 10770 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu) 10771 { 10772 void **slot; 10773 10774 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset, INSERT); 10775 10776 *slot = die; 10777 } 10778 10779 static int 10780 is_ref_attr (struct attribute *attr) 10781 { 10782 switch (attr->form) 10783 { 10784 case DW_FORM_ref_addr: 10785 case DW_FORM_ref1: 10786 case DW_FORM_ref2: 10787 case DW_FORM_ref4: 10788 case DW_FORM_ref8: 10789 case DW_FORM_ref_udata: 10790 return 1; 10791 default: 10792 return 0; 10793 } 10794 } 10795 10796 static unsigned int 10797 dwarf2_get_ref_die_offset (struct attribute *attr) 10798 { 10799 if (is_ref_attr (attr)) 10800 return DW_ADDR (attr); 10801 10802 complaint (&symfile_complaints, 10803 _("unsupported die ref attribute form: '%s'"), 10804 dwarf_form_name (attr->form)); 10805 return 0; 10806 } 10807 10808 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if 10809 * the value held by the attribute is not constant. */ 10810 10811 static LONGEST 10812 dwarf2_get_attr_constant_value (struct attribute *attr, int default_value) 10813 { 10814 if (attr->form == DW_FORM_sdata) 10815 return DW_SND (attr); 10816 else if (attr->form == DW_FORM_udata 10817 || attr->form == DW_FORM_data1 10818 || attr->form == DW_FORM_data2 10819 || attr->form == DW_FORM_data4 10820 || attr->form == DW_FORM_data8) 10821 return DW_UNSND (attr); 10822 else 10823 { 10824 complaint (&symfile_complaints, _("Attribute value is not a constant (%s)"), 10825 dwarf_form_name (attr->form)); 10826 return default_value; 10827 } 10828 } 10829 10830 /* THIS_CU has a reference to PER_CU. If necessary, load the new compilation 10831 unit and add it to our queue. 10832 The result is non-zero if PER_CU was queued, otherwise the result is zero 10833 meaning either PER_CU is already queued or it is already loaded. */ 10834 10835 static int 10836 maybe_queue_comp_unit (struct dwarf2_cu *this_cu, 10837 struct dwarf2_per_cu_data *per_cu) 10838 { 10839 /* Mark the dependence relation so that we don't flush PER_CU 10840 too early. */ 10841 dwarf2_add_dependence (this_cu, per_cu); 10842 10843 /* If it's already on the queue, we have nothing to do. */ 10844 if (per_cu->queued) 10845 return 0; 10846 10847 /* If the compilation unit is already loaded, just mark it as 10848 used. */ 10849 if (per_cu->cu != NULL) 10850 { 10851 per_cu->cu->last_used = 0; 10852 return 0; 10853 } 10854 10855 /* Add it to the queue. */ 10856 queue_comp_unit (per_cu, this_cu->objfile); 10857 10858 return 1; 10859 } 10860 10861 /* Follow reference or signature attribute ATTR of SRC_DIE. 10862 On entry *REF_CU is the CU of SRC_DIE. 10863 On exit *REF_CU is the CU of the result. */ 10864 10865 static struct die_info * 10866 follow_die_ref_or_sig (struct die_info *src_die, struct attribute *attr, 10867 struct dwarf2_cu **ref_cu) 10868 { 10869 struct die_info *die; 10870 10871 if (is_ref_attr (attr)) 10872 die = follow_die_ref (src_die, attr, ref_cu); 10873 else if (attr->form == DW_FORM_sig8) 10874 die = follow_die_sig (src_die, attr, ref_cu); 10875 else 10876 { 10877 dump_die_for_error (src_die); 10878 error (_("Dwarf Error: Expected reference attribute [in module %s]"), 10879 (*ref_cu)->objfile->name); 10880 } 10881 10882 return die; 10883 } 10884 10885 /* Follow reference OFFSET. 10886 On entry *REF_CU is the CU of source DIE referencing OFFSET. 10887 On exit *REF_CU is the CU of the result. */ 10888 10889 static struct die_info * 10890 follow_die_offset (unsigned int offset, struct dwarf2_cu **ref_cu) 10891 { 10892 struct die_info temp_die; 10893 struct dwarf2_cu *target_cu, *cu = *ref_cu; 10894 10895 gdb_assert (cu->per_cu != NULL); 10896 10897 if (cu->per_cu->from_debug_types) 10898 { 10899 /* .debug_types CUs cannot reference anything outside their CU. 10900 If they need to, they have to reference a signatured type via 10901 DW_FORM_sig8. */ 10902 if (! offset_in_cu_p (&cu->header, offset)) 10903 return NULL; 10904 target_cu = cu; 10905 } 10906 else if (! offset_in_cu_p (&cu->header, offset)) 10907 { 10908 struct dwarf2_per_cu_data *per_cu; 10909 10910 per_cu = dwarf2_find_containing_comp_unit (offset, cu->objfile); 10911 10912 /* If necessary, add it to the queue and load its DIEs. */ 10913 if (maybe_queue_comp_unit (cu, per_cu)) 10914 load_full_comp_unit (per_cu, cu->objfile); 10915 10916 target_cu = per_cu->cu; 10917 } 10918 else 10919 target_cu = cu; 10920 10921 *ref_cu = target_cu; 10922 temp_die.offset = offset; 10923 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset); 10924 } 10925 10926 /* Follow reference attribute ATTR of SRC_DIE. 10927 On entry *REF_CU is the CU of SRC_DIE. 10928 On exit *REF_CU is the CU of the result. */ 10929 10930 static struct die_info * 10931 follow_die_ref (struct die_info *src_die, struct attribute *attr, 10932 struct dwarf2_cu **ref_cu) 10933 { 10934 unsigned int offset = dwarf2_get_ref_die_offset (attr); 10935 struct dwarf2_cu *cu = *ref_cu; 10936 struct die_info *die; 10937 10938 die = follow_die_offset (offset, ref_cu); 10939 if (!die) 10940 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE " 10941 "at 0x%x [in module %s]"), 10942 offset, src_die->offset, cu->objfile->name); 10943 10944 return die; 10945 } 10946 10947 /* Return DWARF block and its CU referenced by OFFSET at PER_CU. Returned 10948 value is intended for DW_OP_call*. */ 10949 10950 struct dwarf2_locexpr_baton 10951 dwarf2_fetch_die_location_block (unsigned int offset, 10952 struct dwarf2_per_cu_data *per_cu) 10953 { 10954 struct dwarf2_cu *cu = per_cu->cu; 10955 struct die_info *die; 10956 struct attribute *attr; 10957 struct dwarf2_locexpr_baton retval; 10958 10959 die = follow_die_offset (offset, &cu); 10960 if (!die) 10961 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"), 10962 offset, per_cu->cu->objfile->name); 10963 10964 attr = dwarf2_attr (die, DW_AT_location, cu); 10965 if (!attr) 10966 { 10967 /* DWARF: "If there is no such attribute, then there is no effect.". */ 10968 10969 retval.data = NULL; 10970 retval.size = 0; 10971 } 10972 else 10973 { 10974 if (!attr_form_is_block (attr)) 10975 error (_("Dwarf Error: DIE at 0x%x referenced in module %s " 10976 "is neither DW_FORM_block* nor DW_FORM_exprloc"), 10977 offset, per_cu->cu->objfile->name); 10978 10979 retval.data = DW_BLOCK (attr)->data; 10980 retval.size = DW_BLOCK (attr)->size; 10981 } 10982 retval.per_cu = cu->per_cu; 10983 return retval; 10984 } 10985 10986 /* Follow the signature attribute ATTR in SRC_DIE. 10987 On entry *REF_CU is the CU of SRC_DIE. 10988 On exit *REF_CU is the CU of the result. */ 10989 10990 static struct die_info * 10991 follow_die_sig (struct die_info *src_die, struct attribute *attr, 10992 struct dwarf2_cu **ref_cu) 10993 { 10994 struct objfile *objfile = (*ref_cu)->objfile; 10995 struct die_info temp_die; 10996 struct signatured_type *sig_type = DW_SIGNATURED_TYPE (attr); 10997 struct dwarf2_cu *sig_cu; 10998 struct die_info *die; 10999 11000 /* sig_type will be NULL if the signatured type is missing from 11001 the debug info. */ 11002 if (sig_type == NULL) 11003 error (_("Dwarf Error: Cannot find signatured DIE referenced from DIE " 11004 "at 0x%x [in module %s]"), 11005 src_die->offset, objfile->name); 11006 11007 /* If necessary, add it to the queue and load its DIEs. */ 11008 11009 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu)) 11010 read_signatured_type (objfile, sig_type); 11011 11012 gdb_assert (sig_type->per_cu.cu != NULL); 11013 11014 sig_cu = sig_type->per_cu.cu; 11015 temp_die.offset = sig_cu->header.offset + sig_type->type_offset; 11016 die = htab_find_with_hash (sig_cu->die_hash, &temp_die, temp_die.offset); 11017 if (die) 11018 { 11019 *ref_cu = sig_cu; 11020 return die; 11021 } 11022 11023 error (_("Dwarf Error: Cannot find signatured DIE at 0x%x referenced from DIE " 11024 "at 0x%x [in module %s]"), 11025 sig_type->type_offset, src_die->offset, objfile->name); 11026 } 11027 11028 /* Given an offset of a signatured type, return its signatured_type. */ 11029 11030 static struct signatured_type * 11031 lookup_signatured_type_at_offset (struct objfile *objfile, unsigned int offset) 11032 { 11033 gdb_byte *info_ptr = dwarf2_per_objfile->types.buffer + offset; 11034 unsigned int length, initial_length_size; 11035 unsigned int sig_offset; 11036 struct signatured_type find_entry, *type_sig; 11037 11038 length = read_initial_length (objfile->obfd, info_ptr, &initial_length_size); 11039 sig_offset = (initial_length_size 11040 + 2 /*version*/ 11041 + (initial_length_size == 4 ? 4 : 8) /*debug_abbrev_offset*/ 11042 + 1 /*address_size*/); 11043 find_entry.signature = bfd_get_64 (objfile->obfd, info_ptr + sig_offset); 11044 type_sig = htab_find (dwarf2_per_objfile->signatured_types, &find_entry); 11045 11046 /* This is only used to lookup previously recorded types. 11047 If we didn't find it, it's our bug. */ 11048 gdb_assert (type_sig != NULL); 11049 gdb_assert (offset == type_sig->offset); 11050 11051 return type_sig; 11052 } 11053 11054 /* Read in signatured type at OFFSET and build its CU and die(s). */ 11055 11056 static void 11057 read_signatured_type_at_offset (struct objfile *objfile, 11058 unsigned int offset) 11059 { 11060 struct signatured_type *type_sig; 11061 11062 dwarf2_read_section (objfile, &dwarf2_per_objfile->types); 11063 11064 /* We have the section offset, but we need the signature to do the 11065 hash table lookup. */ 11066 type_sig = lookup_signatured_type_at_offset (objfile, offset); 11067 11068 gdb_assert (type_sig->per_cu.cu == NULL); 11069 11070 read_signatured_type (objfile, type_sig); 11071 11072 gdb_assert (type_sig->per_cu.cu != NULL); 11073 } 11074 11075 /* Read in a signatured type and build its CU and DIEs. */ 11076 11077 static void 11078 read_signatured_type (struct objfile *objfile, 11079 struct signatured_type *type_sig) 11080 { 11081 gdb_byte *types_ptr = dwarf2_per_objfile->types.buffer + type_sig->offset; 11082 struct die_reader_specs reader_specs; 11083 struct dwarf2_cu *cu; 11084 ULONGEST signature; 11085 struct cleanup *back_to, *free_cu_cleanup; 11086 struct attribute *attr; 11087 11088 gdb_assert (type_sig->per_cu.cu == NULL); 11089 11090 cu = xmalloc (sizeof (struct dwarf2_cu)); 11091 memset (cu, 0, sizeof (struct dwarf2_cu)); 11092 obstack_init (&cu->comp_unit_obstack); 11093 cu->objfile = objfile; 11094 type_sig->per_cu.cu = cu; 11095 cu->per_cu = &type_sig->per_cu; 11096 11097 /* If an error occurs while loading, release our storage. */ 11098 free_cu_cleanup = make_cleanup (free_one_comp_unit, cu); 11099 11100 types_ptr = read_type_comp_unit_head (&cu->header, &signature, 11101 types_ptr, objfile->obfd); 11102 gdb_assert (signature == type_sig->signature); 11103 11104 cu->die_hash 11105 = htab_create_alloc_ex (cu->header.length / 12, 11106 die_hash, 11107 die_eq, 11108 NULL, 11109 &cu->comp_unit_obstack, 11110 hashtab_obstack_allocate, 11111 dummy_obstack_deallocate); 11112 11113 dwarf2_read_abbrevs (cu->objfile->obfd, cu); 11114 back_to = make_cleanup (dwarf2_free_abbrev_table, cu); 11115 11116 init_cu_die_reader (&reader_specs, cu); 11117 11118 cu->dies = read_die_and_children (&reader_specs, types_ptr, &types_ptr, 11119 NULL /*parent*/); 11120 11121 /* We try not to read any attributes in this function, because not 11122 all objfiles needed for references have been loaded yet, and symbol 11123 table processing isn't initialized. But we have to set the CU language, 11124 or we won't be able to build types correctly. */ 11125 attr = dwarf2_attr (cu->dies, DW_AT_language, cu); 11126 if (attr) 11127 set_cu_language (DW_UNSND (attr), cu); 11128 else 11129 set_cu_language (language_minimal, cu); 11130 11131 do_cleanups (back_to); 11132 11133 /* We've successfully allocated this compilation unit. Let our caller 11134 clean it up when finished with it. */ 11135 discard_cleanups (free_cu_cleanup); 11136 11137 type_sig->per_cu.cu->read_in_chain = dwarf2_per_objfile->read_in_chain; 11138 dwarf2_per_objfile->read_in_chain = &type_sig->per_cu; 11139 } 11140 11141 /* Decode simple location descriptions. 11142 Given a pointer to a dwarf block that defines a location, compute 11143 the location and return the value. 11144 11145 NOTE drow/2003-11-18: This function is called in two situations 11146 now: for the address of static or global variables (partial symbols 11147 only) and for offsets into structures which are expected to be 11148 (more or less) constant. The partial symbol case should go away, 11149 and only the constant case should remain. That will let this 11150 function complain more accurately. A few special modes are allowed 11151 without complaint for global variables (for instance, global 11152 register values and thread-local values). 11153 11154 A location description containing no operations indicates that the 11155 object is optimized out. The return value is 0 for that case. 11156 FIXME drow/2003-11-16: No callers check for this case any more; soon all 11157 callers will only want a very basic result and this can become a 11158 complaint. 11159 11160 Note that stack[0] is unused except as a default error return. 11161 Note that stack overflow is not yet handled. */ 11162 11163 static CORE_ADDR 11164 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu) 11165 { 11166 struct objfile *objfile = cu->objfile; 11167 int i; 11168 int size = blk->size; 11169 gdb_byte *data = blk->data; 11170 CORE_ADDR stack[64]; 11171 int stacki; 11172 unsigned int bytes_read, unsnd; 11173 gdb_byte op; 11174 11175 i = 0; 11176 stacki = 0; 11177 stack[stacki] = 0; 11178 11179 while (i < size) 11180 { 11181 op = data[i++]; 11182 switch (op) 11183 { 11184 case DW_OP_lit0: 11185 case DW_OP_lit1: 11186 case DW_OP_lit2: 11187 case DW_OP_lit3: 11188 case DW_OP_lit4: 11189 case DW_OP_lit5: 11190 case DW_OP_lit6: 11191 case DW_OP_lit7: 11192 case DW_OP_lit8: 11193 case DW_OP_lit9: 11194 case DW_OP_lit10: 11195 case DW_OP_lit11: 11196 case DW_OP_lit12: 11197 case DW_OP_lit13: 11198 case DW_OP_lit14: 11199 case DW_OP_lit15: 11200 case DW_OP_lit16: 11201 case DW_OP_lit17: 11202 case DW_OP_lit18: 11203 case DW_OP_lit19: 11204 case DW_OP_lit20: 11205 case DW_OP_lit21: 11206 case DW_OP_lit22: 11207 case DW_OP_lit23: 11208 case DW_OP_lit24: 11209 case DW_OP_lit25: 11210 case DW_OP_lit26: 11211 case DW_OP_lit27: 11212 case DW_OP_lit28: 11213 case DW_OP_lit29: 11214 case DW_OP_lit30: 11215 case DW_OP_lit31: 11216 stack[++stacki] = op - DW_OP_lit0; 11217 break; 11218 11219 case DW_OP_reg0: 11220 case DW_OP_reg1: 11221 case DW_OP_reg2: 11222 case DW_OP_reg3: 11223 case DW_OP_reg4: 11224 case DW_OP_reg5: 11225 case DW_OP_reg6: 11226 case DW_OP_reg7: 11227 case DW_OP_reg8: 11228 case DW_OP_reg9: 11229 case DW_OP_reg10: 11230 case DW_OP_reg11: 11231 case DW_OP_reg12: 11232 case DW_OP_reg13: 11233 case DW_OP_reg14: 11234 case DW_OP_reg15: 11235 case DW_OP_reg16: 11236 case DW_OP_reg17: 11237 case DW_OP_reg18: 11238 case DW_OP_reg19: 11239 case DW_OP_reg20: 11240 case DW_OP_reg21: 11241 case DW_OP_reg22: 11242 case DW_OP_reg23: 11243 case DW_OP_reg24: 11244 case DW_OP_reg25: 11245 case DW_OP_reg26: 11246 case DW_OP_reg27: 11247 case DW_OP_reg28: 11248 case DW_OP_reg29: 11249 case DW_OP_reg30: 11250 case DW_OP_reg31: 11251 stack[++stacki] = op - DW_OP_reg0; 11252 if (i < size) 11253 dwarf2_complex_location_expr_complaint (); 11254 break; 11255 11256 case DW_OP_regx: 11257 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read); 11258 i += bytes_read; 11259 stack[++stacki] = unsnd; 11260 if (i < size) 11261 dwarf2_complex_location_expr_complaint (); 11262 break; 11263 11264 case DW_OP_addr: 11265 stack[++stacki] = read_address (objfile->obfd, &data[i], 11266 cu, &bytes_read); 11267 i += bytes_read; 11268 break; 11269 11270 case DW_OP_const1u: 11271 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]); 11272 i += 1; 11273 break; 11274 11275 case DW_OP_const1s: 11276 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]); 11277 i += 1; 11278 break; 11279 11280 case DW_OP_const2u: 11281 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]); 11282 i += 2; 11283 break; 11284 11285 case DW_OP_const2s: 11286 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]); 11287 i += 2; 11288 break; 11289 11290 case DW_OP_const4u: 11291 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]); 11292 i += 4; 11293 break; 11294 11295 case DW_OP_const4s: 11296 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]); 11297 i += 4; 11298 break; 11299 11300 case DW_OP_constu: 11301 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i), 11302 &bytes_read); 11303 i += bytes_read; 11304 break; 11305 11306 case DW_OP_consts: 11307 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read); 11308 i += bytes_read; 11309 break; 11310 11311 case DW_OP_dup: 11312 stack[stacki + 1] = stack[stacki]; 11313 stacki++; 11314 break; 11315 11316 case DW_OP_plus: 11317 stack[stacki - 1] += stack[stacki]; 11318 stacki--; 11319 break; 11320 11321 case DW_OP_plus_uconst: 11322 stack[stacki] += read_unsigned_leb128 (NULL, (data + i), &bytes_read); 11323 i += bytes_read; 11324 break; 11325 11326 case DW_OP_minus: 11327 stack[stacki - 1] -= stack[stacki]; 11328 stacki--; 11329 break; 11330 11331 case DW_OP_deref: 11332 /* If we're not the last op, then we definitely can't encode 11333 this using GDB's address_class enum. This is valid for partial 11334 global symbols, although the variable's address will be bogus 11335 in the psymtab. */ 11336 if (i < size) 11337 dwarf2_complex_location_expr_complaint (); 11338 break; 11339 11340 case DW_OP_GNU_push_tls_address: 11341 /* The top of the stack has the offset from the beginning 11342 of the thread control block at which the variable is located. */ 11343 /* Nothing should follow this operator, so the top of stack would 11344 be returned. */ 11345 /* This is valid for partial global symbols, but the variable's 11346 address will be bogus in the psymtab. */ 11347 if (i < size) 11348 dwarf2_complex_location_expr_complaint (); 11349 break; 11350 11351 case DW_OP_GNU_uninit: 11352 break; 11353 11354 default: 11355 complaint (&symfile_complaints, _("unsupported stack op: '%s'"), 11356 dwarf_stack_op_name (op, 1)); 11357 return (stack[stacki]); 11358 } 11359 } 11360 return (stack[stacki]); 11361 } 11362 11363 /* memory allocation interface */ 11364 11365 static struct dwarf_block * 11366 dwarf_alloc_block (struct dwarf2_cu *cu) 11367 { 11368 struct dwarf_block *blk; 11369 11370 blk = (struct dwarf_block *) 11371 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block)); 11372 return (blk); 11373 } 11374 11375 static struct abbrev_info * 11376 dwarf_alloc_abbrev (struct dwarf2_cu *cu) 11377 { 11378 struct abbrev_info *abbrev; 11379 11380 abbrev = (struct abbrev_info *) 11381 obstack_alloc (&cu->abbrev_obstack, sizeof (struct abbrev_info)); 11382 memset (abbrev, 0, sizeof (struct abbrev_info)); 11383 return (abbrev); 11384 } 11385 11386 static struct die_info * 11387 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs) 11388 { 11389 struct die_info *die; 11390 size_t size = sizeof (struct die_info); 11391 11392 if (num_attrs > 1) 11393 size += (num_attrs - 1) * sizeof (struct attribute); 11394 11395 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size); 11396 memset (die, 0, sizeof (struct die_info)); 11397 return (die); 11398 } 11399 11400 11401 /* Macro support. */ 11402 11403 11404 /* Return the full name of file number I in *LH's file name table. 11405 Use COMP_DIR as the name of the current directory of the 11406 compilation. The result is allocated using xmalloc; the caller is 11407 responsible for freeing it. */ 11408 static char * 11409 file_full_name (int file, struct line_header *lh, const char *comp_dir) 11410 { 11411 /* Is the file number a valid index into the line header's file name 11412 table? Remember that file numbers start with one, not zero. */ 11413 if (1 <= file && file <= lh->num_file_names) 11414 { 11415 struct file_entry *fe = &lh->file_names[file - 1]; 11416 11417 if (IS_ABSOLUTE_PATH (fe->name)) 11418 return xstrdup (fe->name); 11419 else 11420 { 11421 const char *dir; 11422 int dir_len; 11423 char *full_name; 11424 11425 if (fe->dir_index) 11426 dir = lh->include_dirs[fe->dir_index - 1]; 11427 else 11428 dir = comp_dir; 11429 11430 if (dir) 11431 { 11432 dir_len = strlen (dir); 11433 full_name = xmalloc (dir_len + 1 + strlen (fe->name) + 1); 11434 strcpy (full_name, dir); 11435 full_name[dir_len] = '/'; 11436 strcpy (full_name + dir_len + 1, fe->name); 11437 return full_name; 11438 } 11439 else 11440 return xstrdup (fe->name); 11441 } 11442 } 11443 else 11444 { 11445 /* The compiler produced a bogus file number. We can at least 11446 record the macro definitions made in the file, even if we 11447 won't be able to find the file by name. */ 11448 char fake_name[80]; 11449 11450 sprintf (fake_name, "<bad macro file number %d>", file); 11451 11452 complaint (&symfile_complaints, 11453 _("bad file number in macro information (%d)"), 11454 file); 11455 11456 return xstrdup (fake_name); 11457 } 11458 } 11459 11460 11461 static struct macro_source_file * 11462 macro_start_file (int file, int line, 11463 struct macro_source_file *current_file, 11464 const char *comp_dir, 11465 struct line_header *lh, struct objfile *objfile) 11466 { 11467 /* The full name of this source file. */ 11468 char *full_name = file_full_name (file, lh, comp_dir); 11469 11470 /* We don't create a macro table for this compilation unit 11471 at all until we actually get a filename. */ 11472 if (! pending_macros) 11473 pending_macros = new_macro_table (&objfile->objfile_obstack, 11474 objfile->macro_cache); 11475 11476 if (! current_file) 11477 /* If we have no current file, then this must be the start_file 11478 directive for the compilation unit's main source file. */ 11479 current_file = macro_set_main (pending_macros, full_name); 11480 else 11481 current_file = macro_include (current_file, line, full_name); 11482 11483 xfree (full_name); 11484 11485 return current_file; 11486 } 11487 11488 11489 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory, 11490 followed by a null byte. */ 11491 static char * 11492 copy_string (const char *buf, int len) 11493 { 11494 char *s = xmalloc (len + 1); 11495 11496 memcpy (s, buf, len); 11497 s[len] = '\0'; 11498 return s; 11499 } 11500 11501 11502 static const char * 11503 consume_improper_spaces (const char *p, const char *body) 11504 { 11505 if (*p == ' ') 11506 { 11507 complaint (&symfile_complaints, 11508 _("macro definition contains spaces in formal argument list:\n`%s'"), 11509 body); 11510 11511 while (*p == ' ') 11512 p++; 11513 } 11514 11515 return p; 11516 } 11517 11518 11519 static void 11520 parse_macro_definition (struct macro_source_file *file, int line, 11521 const char *body) 11522 { 11523 const char *p; 11524 11525 /* The body string takes one of two forms. For object-like macro 11526 definitions, it should be: 11527 11528 <macro name> " " <definition> 11529 11530 For function-like macro definitions, it should be: 11531 11532 <macro name> "() " <definition> 11533 or 11534 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition> 11535 11536 Spaces may appear only where explicitly indicated, and in the 11537 <definition>. 11538 11539 The Dwarf 2 spec says that an object-like macro's name is always 11540 followed by a space, but versions of GCC around March 2002 omit 11541 the space when the macro's definition is the empty string. 11542 11543 The Dwarf 2 spec says that there should be no spaces between the 11544 formal arguments in a function-like macro's formal argument list, 11545 but versions of GCC around March 2002 include spaces after the 11546 commas. */ 11547 11548 11549 /* Find the extent of the macro name. The macro name is terminated 11550 by either a space or null character (for an object-like macro) or 11551 an opening paren (for a function-like macro). */ 11552 for (p = body; *p; p++) 11553 if (*p == ' ' || *p == '(') 11554 break; 11555 11556 if (*p == ' ' || *p == '\0') 11557 { 11558 /* It's an object-like macro. */ 11559 int name_len = p - body; 11560 char *name = copy_string (body, name_len); 11561 const char *replacement; 11562 11563 if (*p == ' ') 11564 replacement = body + name_len + 1; 11565 else 11566 { 11567 dwarf2_macro_malformed_definition_complaint (body); 11568 replacement = body + name_len; 11569 } 11570 11571 macro_define_object (file, line, name, replacement); 11572 11573 xfree (name); 11574 } 11575 else if (*p == '(') 11576 { 11577 /* It's a function-like macro. */ 11578 char *name = copy_string (body, p - body); 11579 int argc = 0; 11580 int argv_size = 1; 11581 char **argv = xmalloc (argv_size * sizeof (*argv)); 11582 11583 p++; 11584 11585 p = consume_improper_spaces (p, body); 11586 11587 /* Parse the formal argument list. */ 11588 while (*p && *p != ')') 11589 { 11590 /* Find the extent of the current argument name. */ 11591 const char *arg_start = p; 11592 11593 while (*p && *p != ',' && *p != ')' && *p != ' ') 11594 p++; 11595 11596 if (! *p || p == arg_start) 11597 dwarf2_macro_malformed_definition_complaint (body); 11598 else 11599 { 11600 /* Make sure argv has room for the new argument. */ 11601 if (argc >= argv_size) 11602 { 11603 argv_size *= 2; 11604 argv = xrealloc (argv, argv_size * sizeof (*argv)); 11605 } 11606 11607 argv[argc++] = copy_string (arg_start, p - arg_start); 11608 } 11609 11610 p = consume_improper_spaces (p, body); 11611 11612 /* Consume the comma, if present. */ 11613 if (*p == ',') 11614 { 11615 p++; 11616 11617 p = consume_improper_spaces (p, body); 11618 } 11619 } 11620 11621 if (*p == ')') 11622 { 11623 p++; 11624 11625 if (*p == ' ') 11626 /* Perfectly formed definition, no complaints. */ 11627 macro_define_function (file, line, name, 11628 argc, (const char **) argv, 11629 p + 1); 11630 else if (*p == '\0') 11631 { 11632 /* Complain, but do define it. */ 11633 dwarf2_macro_malformed_definition_complaint (body); 11634 macro_define_function (file, line, name, 11635 argc, (const char **) argv, 11636 p); 11637 } 11638 else 11639 /* Just complain. */ 11640 dwarf2_macro_malformed_definition_complaint (body); 11641 } 11642 else 11643 /* Just complain. */ 11644 dwarf2_macro_malformed_definition_complaint (body); 11645 11646 xfree (name); 11647 { 11648 int i; 11649 11650 for (i = 0; i < argc; i++) 11651 xfree (argv[i]); 11652 } 11653 xfree (argv); 11654 } 11655 else 11656 dwarf2_macro_malformed_definition_complaint (body); 11657 } 11658 11659 11660 static void 11661 dwarf_decode_macros (struct line_header *lh, unsigned int offset, 11662 char *comp_dir, bfd *abfd, 11663 struct dwarf2_cu *cu) 11664 { 11665 gdb_byte *mac_ptr, *mac_end; 11666 struct macro_source_file *current_file = 0; 11667 enum dwarf_macinfo_record_type macinfo_type; 11668 int at_commandline; 11669 11670 dwarf2_read_section (dwarf2_per_objfile->objfile, 11671 &dwarf2_per_objfile->macinfo); 11672 if (dwarf2_per_objfile->macinfo.buffer == NULL) 11673 { 11674 complaint (&symfile_complaints, _("missing .debug_macinfo section")); 11675 return; 11676 } 11677 11678 /* First pass: Find the name of the base filename. 11679 This filename is needed in order to process all macros whose definition 11680 (or undefinition) comes from the command line. These macros are defined 11681 before the first DW_MACINFO_start_file entry, and yet still need to be 11682 associated to the base file. 11683 11684 To determine the base file name, we scan the macro definitions until we 11685 reach the first DW_MACINFO_start_file entry. We then initialize 11686 CURRENT_FILE accordingly so that any macro definition found before the 11687 first DW_MACINFO_start_file can still be associated to the base file. */ 11688 11689 mac_ptr = dwarf2_per_objfile->macinfo.buffer + offset; 11690 mac_end = dwarf2_per_objfile->macinfo.buffer 11691 + dwarf2_per_objfile->macinfo.size; 11692 11693 do 11694 { 11695 /* Do we at least have room for a macinfo type byte? */ 11696 if (mac_ptr >= mac_end) 11697 { 11698 /* Complaint is printed during the second pass as GDB will probably 11699 stop the first pass earlier upon finding DW_MACINFO_start_file. */ 11700 break; 11701 } 11702 11703 macinfo_type = read_1_byte (abfd, mac_ptr); 11704 mac_ptr++; 11705 11706 switch (macinfo_type) 11707 { 11708 /* A zero macinfo type indicates the end of the macro 11709 information. */ 11710 case 0: 11711 break; 11712 11713 case DW_MACINFO_define: 11714 case DW_MACINFO_undef: 11715 /* Only skip the data by MAC_PTR. */ 11716 { 11717 unsigned int bytes_read; 11718 11719 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 11720 mac_ptr += bytes_read; 11721 read_string (abfd, mac_ptr, &bytes_read); 11722 mac_ptr += bytes_read; 11723 } 11724 break; 11725 11726 case DW_MACINFO_start_file: 11727 { 11728 unsigned int bytes_read; 11729 int line, file; 11730 11731 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 11732 mac_ptr += bytes_read; 11733 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 11734 mac_ptr += bytes_read; 11735 11736 current_file = macro_start_file (file, line, current_file, comp_dir, 11737 lh, cu->objfile); 11738 } 11739 break; 11740 11741 case DW_MACINFO_end_file: 11742 /* No data to skip by MAC_PTR. */ 11743 break; 11744 11745 case DW_MACINFO_vendor_ext: 11746 /* Only skip the data by MAC_PTR. */ 11747 { 11748 unsigned int bytes_read; 11749 11750 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 11751 mac_ptr += bytes_read; 11752 read_string (abfd, mac_ptr, &bytes_read); 11753 mac_ptr += bytes_read; 11754 } 11755 break; 11756 11757 default: 11758 break; 11759 } 11760 } while (macinfo_type != 0 && current_file == NULL); 11761 11762 /* Second pass: Process all entries. 11763 11764 Use the AT_COMMAND_LINE flag to determine whether we are still processing 11765 command-line macro definitions/undefinitions. This flag is unset when we 11766 reach the first DW_MACINFO_start_file entry. */ 11767 11768 mac_ptr = dwarf2_per_objfile->macinfo.buffer + offset; 11769 11770 /* Determines if GDB is still before first DW_MACINFO_start_file. If true 11771 GDB is still reading the definitions from command line. First 11772 DW_MACINFO_start_file will need to be ignored as it was already executed 11773 to create CURRENT_FILE for the main source holding also the command line 11774 definitions. On first met DW_MACINFO_start_file this flag is reset to 11775 normally execute all the remaining DW_MACINFO_start_file macinfos. */ 11776 11777 at_commandline = 1; 11778 11779 do 11780 { 11781 /* Do we at least have room for a macinfo type byte? */ 11782 if (mac_ptr >= mac_end) 11783 { 11784 dwarf2_macros_too_long_complaint (); 11785 break; 11786 } 11787 11788 macinfo_type = read_1_byte (abfd, mac_ptr); 11789 mac_ptr++; 11790 11791 switch (macinfo_type) 11792 { 11793 /* A zero macinfo type indicates the end of the macro 11794 information. */ 11795 case 0: 11796 break; 11797 11798 case DW_MACINFO_define: 11799 case DW_MACINFO_undef: 11800 { 11801 unsigned int bytes_read; 11802 int line; 11803 char *body; 11804 11805 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 11806 mac_ptr += bytes_read; 11807 body = read_string (abfd, mac_ptr, &bytes_read); 11808 mac_ptr += bytes_read; 11809 11810 if (! current_file) 11811 { 11812 /* DWARF violation as no main source is present. */ 11813 complaint (&symfile_complaints, 11814 _("debug info with no main source gives macro %s " 11815 "on line %d: %s"), 11816 macinfo_type == DW_MACINFO_define ? 11817 _("definition") : 11818 macinfo_type == DW_MACINFO_undef ? 11819 _("undefinition") : 11820 _("something-or-other"), line, body); 11821 break; 11822 } 11823 if ((line == 0 && !at_commandline) || (line != 0 && at_commandline)) 11824 complaint (&symfile_complaints, 11825 _("debug info gives %s macro %s with %s line %d: %s"), 11826 at_commandline ? _("command-line") : _("in-file"), 11827 macinfo_type == DW_MACINFO_define ? 11828 _("definition") : 11829 macinfo_type == DW_MACINFO_undef ? 11830 _("undefinition") : 11831 _("something-or-other"), 11832 line == 0 ? _("zero") : _("non-zero"), line, body); 11833 11834 if (macinfo_type == DW_MACINFO_define) 11835 parse_macro_definition (current_file, line, body); 11836 else if (macinfo_type == DW_MACINFO_undef) 11837 macro_undef (current_file, line, body); 11838 } 11839 break; 11840 11841 case DW_MACINFO_start_file: 11842 { 11843 unsigned int bytes_read; 11844 int line, file; 11845 11846 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 11847 mac_ptr += bytes_read; 11848 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 11849 mac_ptr += bytes_read; 11850 11851 if ((line == 0 && !at_commandline) || (line != 0 && at_commandline)) 11852 complaint (&symfile_complaints, 11853 _("debug info gives source %d included " 11854 "from %s at %s line %d"), 11855 file, at_commandline ? _("command-line") : _("file"), 11856 line == 0 ? _("zero") : _("non-zero"), line); 11857 11858 if (at_commandline) 11859 { 11860 /* This DW_MACINFO_start_file was executed in the pass one. */ 11861 at_commandline = 0; 11862 } 11863 else 11864 current_file = macro_start_file (file, line, 11865 current_file, comp_dir, 11866 lh, cu->objfile); 11867 } 11868 break; 11869 11870 case DW_MACINFO_end_file: 11871 if (! current_file) 11872 complaint (&symfile_complaints, 11873 _("macro debug info has an unmatched `close_file' directive")); 11874 else 11875 { 11876 current_file = current_file->included_by; 11877 if (! current_file) 11878 { 11879 enum dwarf_macinfo_record_type next_type; 11880 11881 /* GCC circa March 2002 doesn't produce the zero 11882 type byte marking the end of the compilation 11883 unit. Complain if it's not there, but exit no 11884 matter what. */ 11885 11886 /* Do we at least have room for a macinfo type byte? */ 11887 if (mac_ptr >= mac_end) 11888 { 11889 dwarf2_macros_too_long_complaint (); 11890 return; 11891 } 11892 11893 /* We don't increment mac_ptr here, so this is just 11894 a look-ahead. */ 11895 next_type = read_1_byte (abfd, mac_ptr); 11896 if (next_type != 0) 11897 complaint (&symfile_complaints, 11898 _("no terminating 0-type entry for macros in `.debug_macinfo' section")); 11899 11900 return; 11901 } 11902 } 11903 break; 11904 11905 case DW_MACINFO_vendor_ext: 11906 { 11907 unsigned int bytes_read; 11908 int constant; 11909 char *string; 11910 11911 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); 11912 mac_ptr += bytes_read; 11913 string = read_string (abfd, mac_ptr, &bytes_read); 11914 mac_ptr += bytes_read; 11915 11916 /* We don't recognize any vendor extensions. */ 11917 } 11918 break; 11919 } 11920 } while (macinfo_type != 0); 11921 } 11922 11923 /* Check if the attribute's form is a DW_FORM_block* 11924 if so return true else false. */ 11925 static int 11926 attr_form_is_block (struct attribute *attr) 11927 { 11928 return (attr == NULL ? 0 : 11929 attr->form == DW_FORM_block1 11930 || attr->form == DW_FORM_block2 11931 || attr->form == DW_FORM_block4 11932 || attr->form == DW_FORM_block 11933 || attr->form == DW_FORM_exprloc); 11934 } 11935 11936 /* Return non-zero if ATTR's value is a section offset --- classes 11937 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise. 11938 You may use DW_UNSND (attr) to retrieve such offsets. 11939 11940 Section 7.5.4, "Attribute Encodings", explains that no attribute 11941 may have a value that belongs to more than one of these classes; it 11942 would be ambiguous if we did, because we use the same forms for all 11943 of them. */ 11944 static int 11945 attr_form_is_section_offset (struct attribute *attr) 11946 { 11947 return (attr->form == DW_FORM_data4 11948 || attr->form == DW_FORM_data8 11949 || attr->form == DW_FORM_sec_offset); 11950 } 11951 11952 11953 /* Return non-zero if ATTR's value falls in the 'constant' class, or 11954 zero otherwise. When this function returns true, you can apply 11955 dwarf2_get_attr_constant_value to it. 11956 11957 However, note that for some attributes you must check 11958 attr_form_is_section_offset before using this test. DW_FORM_data4 11959 and DW_FORM_data8 are members of both the constant class, and of 11960 the classes that contain offsets into other debug sections 11961 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says 11962 that, if an attribute's can be either a constant or one of the 11963 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be 11964 taken as section offsets, not constants. */ 11965 static int 11966 attr_form_is_constant (struct attribute *attr) 11967 { 11968 switch (attr->form) 11969 { 11970 case DW_FORM_sdata: 11971 case DW_FORM_udata: 11972 case DW_FORM_data1: 11973 case DW_FORM_data2: 11974 case DW_FORM_data4: 11975 case DW_FORM_data8: 11976 return 1; 11977 default: 11978 return 0; 11979 } 11980 } 11981 11982 static void 11983 dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym, 11984 struct dwarf2_cu *cu) 11985 { 11986 if (attr_form_is_section_offset (attr) 11987 /* ".debug_loc" may not exist at all, or the offset may be outside 11988 the section. If so, fall through to the complaint in the 11989 other branch. */ 11990 && DW_UNSND (attr) < dwarf2_per_objfile->loc.size) 11991 { 11992 struct dwarf2_loclist_baton *baton; 11993 11994 baton = obstack_alloc (&cu->objfile->objfile_obstack, 11995 sizeof (struct dwarf2_loclist_baton)); 11996 baton->per_cu = cu->per_cu; 11997 gdb_assert (baton->per_cu); 11998 11999 dwarf2_read_section (dwarf2_per_objfile->objfile, 12000 &dwarf2_per_objfile->loc); 12001 12002 /* We don't know how long the location list is, but make sure we 12003 don't run off the edge of the section. */ 12004 baton->size = dwarf2_per_objfile->loc.size - DW_UNSND (attr); 12005 baton->data = dwarf2_per_objfile->loc.buffer + DW_UNSND (attr); 12006 baton->base_address = cu->base_address; 12007 if (cu->base_known == 0) 12008 complaint (&symfile_complaints, 12009 _("Location list used without specifying the CU base address.")); 12010 12011 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_loclist_funcs; 12012 SYMBOL_LOCATION_BATON (sym) = baton; 12013 } 12014 else 12015 { 12016 struct dwarf2_locexpr_baton *baton; 12017 12018 baton = obstack_alloc (&cu->objfile->objfile_obstack, 12019 sizeof (struct dwarf2_locexpr_baton)); 12020 baton->per_cu = cu->per_cu; 12021 gdb_assert (baton->per_cu); 12022 12023 if (attr_form_is_block (attr)) 12024 { 12025 /* Note that we're just copying the block's data pointer 12026 here, not the actual data. We're still pointing into the 12027 info_buffer for SYM's objfile; right now we never release 12028 that buffer, but when we do clean up properly this may 12029 need to change. */ 12030 baton->size = DW_BLOCK (attr)->size; 12031 baton->data = DW_BLOCK (attr)->data; 12032 } 12033 else 12034 { 12035 dwarf2_invalid_attrib_class_complaint ("location description", 12036 SYMBOL_NATURAL_NAME (sym)); 12037 baton->size = 0; 12038 baton->data = NULL; 12039 } 12040 12041 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs; 12042 SYMBOL_LOCATION_BATON (sym) = baton; 12043 } 12044 } 12045 12046 /* Return the OBJFILE associated with the compilation unit CU. If CU 12047 came from a separate debuginfo file, then the master objfile is 12048 returned. */ 12049 12050 struct objfile * 12051 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu) 12052 { 12053 struct objfile *objfile = per_cu->psymtab->objfile; 12054 12055 /* Return the master objfile, so that we can report and look up the 12056 correct file containing this variable. */ 12057 if (objfile->separate_debug_objfile_backlink) 12058 objfile = objfile->separate_debug_objfile_backlink; 12059 12060 return objfile; 12061 } 12062 12063 /* Return the address size given in the compilation unit header for CU. */ 12064 12065 CORE_ADDR 12066 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu) 12067 { 12068 if (per_cu->cu) 12069 return per_cu->cu->header.addr_size; 12070 else 12071 { 12072 /* If the CU is not currently read in, we re-read its header. */ 12073 struct objfile *objfile = per_cu->psymtab->objfile; 12074 struct dwarf2_per_objfile *per_objfile 12075 = objfile_data (objfile, dwarf2_objfile_data_key); 12076 gdb_byte *info_ptr = per_objfile->info.buffer + per_cu->offset; 12077 struct comp_unit_head cu_header; 12078 12079 memset (&cu_header, 0, sizeof cu_header); 12080 read_comp_unit_head (&cu_header, info_ptr, objfile->obfd); 12081 return cu_header.addr_size; 12082 } 12083 } 12084 12085 /* Return the offset size given in the compilation unit header for CU. */ 12086 12087 int 12088 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu) 12089 { 12090 if (per_cu->cu) 12091 return per_cu->cu->header.offset_size; 12092 else 12093 { 12094 /* If the CU is not currently read in, we re-read its header. */ 12095 struct objfile *objfile = per_cu->psymtab->objfile; 12096 struct dwarf2_per_objfile *per_objfile 12097 = objfile_data (objfile, dwarf2_objfile_data_key); 12098 gdb_byte *info_ptr = per_objfile->info.buffer + per_cu->offset; 12099 struct comp_unit_head cu_header; 12100 12101 memset (&cu_header, 0, sizeof cu_header); 12102 read_comp_unit_head (&cu_header, info_ptr, objfile->obfd); 12103 return cu_header.offset_size; 12104 } 12105 } 12106 12107 /* Return the text offset of the CU. The returned offset comes from 12108 this CU's objfile. If this objfile came from a separate debuginfo 12109 file, then the offset may be different from the corresponding 12110 offset in the parent objfile. */ 12111 12112 CORE_ADDR 12113 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu) 12114 { 12115 struct objfile *objfile = per_cu->psymtab->objfile; 12116 12117 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); 12118 } 12119 12120 /* Locate the .debug_info compilation unit from CU's objfile which contains 12121 the DIE at OFFSET. Raises an error on failure. */ 12122 12123 static struct dwarf2_per_cu_data * 12124 dwarf2_find_containing_comp_unit (unsigned int offset, 12125 struct objfile *objfile) 12126 { 12127 struct dwarf2_per_cu_data *this_cu; 12128 int low, high; 12129 12130 low = 0; 12131 high = dwarf2_per_objfile->n_comp_units - 1; 12132 while (high > low) 12133 { 12134 int mid = low + (high - low) / 2; 12135 12136 if (dwarf2_per_objfile->all_comp_units[mid]->offset >= offset) 12137 high = mid; 12138 else 12139 low = mid + 1; 12140 } 12141 gdb_assert (low == high); 12142 if (dwarf2_per_objfile->all_comp_units[low]->offset > offset) 12143 { 12144 if (low == 0) 12145 error (_("Dwarf Error: could not find partial DIE containing " 12146 "offset 0x%lx [in module %s]"), 12147 (long) offset, bfd_get_filename (objfile->obfd)); 12148 12149 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset <= offset); 12150 return dwarf2_per_objfile->all_comp_units[low-1]; 12151 } 12152 else 12153 { 12154 this_cu = dwarf2_per_objfile->all_comp_units[low]; 12155 if (low == dwarf2_per_objfile->n_comp_units - 1 12156 && offset >= this_cu->offset + this_cu->length) 12157 error (_("invalid dwarf2 offset %u"), offset); 12158 gdb_assert (offset < this_cu->offset + this_cu->length); 12159 return this_cu; 12160 } 12161 } 12162 12163 /* Locate the compilation unit from OBJFILE which is located at exactly 12164 OFFSET. Raises an error on failure. */ 12165 12166 static struct dwarf2_per_cu_data * 12167 dwarf2_find_comp_unit (unsigned int offset, struct objfile *objfile) 12168 { 12169 struct dwarf2_per_cu_data *this_cu; 12170 12171 this_cu = dwarf2_find_containing_comp_unit (offset, objfile); 12172 if (this_cu->offset != offset) 12173 error (_("no compilation unit with offset %u."), offset); 12174 return this_cu; 12175 } 12176 12177 /* Malloc space for a dwarf2_cu for OBJFILE and initialize it. */ 12178 12179 static struct dwarf2_cu * 12180 alloc_one_comp_unit (struct objfile *objfile) 12181 { 12182 struct dwarf2_cu *cu = xcalloc (1, sizeof (struct dwarf2_cu)); 12183 cu->objfile = objfile; 12184 obstack_init (&cu->comp_unit_obstack); 12185 return cu; 12186 } 12187 12188 /* Release one cached compilation unit, CU. We unlink it from the tree 12189 of compilation units, but we don't remove it from the read_in_chain; 12190 the caller is responsible for that. 12191 NOTE: DATA is a void * because this function is also used as a 12192 cleanup routine. */ 12193 12194 static void 12195 free_one_comp_unit (void *data) 12196 { 12197 struct dwarf2_cu *cu = data; 12198 12199 if (cu->per_cu != NULL) 12200 cu->per_cu->cu = NULL; 12201 cu->per_cu = NULL; 12202 12203 obstack_free (&cu->comp_unit_obstack, NULL); 12204 12205 xfree (cu); 12206 } 12207 12208 /* This cleanup function is passed the address of a dwarf2_cu on the stack 12209 when we're finished with it. We can't free the pointer itself, but be 12210 sure to unlink it from the cache. Also release any associated storage 12211 and perform cache maintenance. 12212 12213 Only used during partial symbol parsing. */ 12214 12215 static void 12216 free_stack_comp_unit (void *data) 12217 { 12218 struct dwarf2_cu *cu = data; 12219 12220 obstack_free (&cu->comp_unit_obstack, NULL); 12221 cu->partial_dies = NULL; 12222 12223 if (cu->per_cu != NULL) 12224 { 12225 /* This compilation unit is on the stack in our caller, so we 12226 should not xfree it. Just unlink it. */ 12227 cu->per_cu->cu = NULL; 12228 cu->per_cu = NULL; 12229 12230 /* If we had a per-cu pointer, then we may have other compilation 12231 units loaded, so age them now. */ 12232 age_cached_comp_units (); 12233 } 12234 } 12235 12236 /* Free all cached compilation units. */ 12237 12238 static void 12239 free_cached_comp_units (void *data) 12240 { 12241 struct dwarf2_per_cu_data *per_cu, **last_chain; 12242 12243 per_cu = dwarf2_per_objfile->read_in_chain; 12244 last_chain = &dwarf2_per_objfile->read_in_chain; 12245 while (per_cu != NULL) 12246 { 12247 struct dwarf2_per_cu_data *next_cu; 12248 12249 next_cu = per_cu->cu->read_in_chain; 12250 12251 free_one_comp_unit (per_cu->cu); 12252 *last_chain = next_cu; 12253 12254 per_cu = next_cu; 12255 } 12256 } 12257 12258 /* Increase the age counter on each cached compilation unit, and free 12259 any that are too old. */ 12260 12261 static void 12262 age_cached_comp_units (void) 12263 { 12264 struct dwarf2_per_cu_data *per_cu, **last_chain; 12265 12266 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain); 12267 per_cu = dwarf2_per_objfile->read_in_chain; 12268 while (per_cu != NULL) 12269 { 12270 per_cu->cu->last_used ++; 12271 if (per_cu->cu->last_used <= dwarf2_max_cache_age) 12272 dwarf2_mark (per_cu->cu); 12273 per_cu = per_cu->cu->read_in_chain; 12274 } 12275 12276 per_cu = dwarf2_per_objfile->read_in_chain; 12277 last_chain = &dwarf2_per_objfile->read_in_chain; 12278 while (per_cu != NULL) 12279 { 12280 struct dwarf2_per_cu_data *next_cu; 12281 12282 next_cu = per_cu->cu->read_in_chain; 12283 12284 if (!per_cu->cu->mark) 12285 { 12286 free_one_comp_unit (per_cu->cu); 12287 *last_chain = next_cu; 12288 } 12289 else 12290 last_chain = &per_cu->cu->read_in_chain; 12291 12292 per_cu = next_cu; 12293 } 12294 } 12295 12296 /* Remove a single compilation unit from the cache. */ 12297 12298 static void 12299 free_one_cached_comp_unit (void *target_cu) 12300 { 12301 struct dwarf2_per_cu_data *per_cu, **last_chain; 12302 12303 per_cu = dwarf2_per_objfile->read_in_chain; 12304 last_chain = &dwarf2_per_objfile->read_in_chain; 12305 while (per_cu != NULL) 12306 { 12307 struct dwarf2_per_cu_data *next_cu; 12308 12309 next_cu = per_cu->cu->read_in_chain; 12310 12311 if (per_cu->cu == target_cu) 12312 { 12313 free_one_comp_unit (per_cu->cu); 12314 *last_chain = next_cu; 12315 break; 12316 } 12317 else 12318 last_chain = &per_cu->cu->read_in_chain; 12319 12320 per_cu = next_cu; 12321 } 12322 } 12323 12324 /* Release all extra memory associated with OBJFILE. */ 12325 12326 void 12327 dwarf2_free_objfile (struct objfile *objfile) 12328 { 12329 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key); 12330 12331 if (dwarf2_per_objfile == NULL) 12332 return; 12333 12334 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */ 12335 free_cached_comp_units (NULL); 12336 12337 /* Everything else should be on the objfile obstack. */ 12338 } 12339 12340 /* A pair of DIE offset and GDB type pointer. We store these 12341 in a hash table separate from the DIEs, and preserve them 12342 when the DIEs are flushed out of cache. */ 12343 12344 struct dwarf2_offset_and_type 12345 { 12346 unsigned int offset; 12347 struct type *type; 12348 }; 12349 12350 /* Hash function for a dwarf2_offset_and_type. */ 12351 12352 static hashval_t 12353 offset_and_type_hash (const void *item) 12354 { 12355 const struct dwarf2_offset_and_type *ofs = item; 12356 12357 return ofs->offset; 12358 } 12359 12360 /* Equality function for a dwarf2_offset_and_type. */ 12361 12362 static int 12363 offset_and_type_eq (const void *item_lhs, const void *item_rhs) 12364 { 12365 const struct dwarf2_offset_and_type *ofs_lhs = item_lhs; 12366 const struct dwarf2_offset_and_type *ofs_rhs = item_rhs; 12367 12368 return ofs_lhs->offset == ofs_rhs->offset; 12369 } 12370 12371 /* Set the type associated with DIE to TYPE. Save it in CU's hash 12372 table if necessary. For convenience, return TYPE. 12373 12374 The DIEs reading must have careful ordering to: 12375 * Not cause infite loops trying to read in DIEs as a prerequisite for 12376 reading current DIE. 12377 * Not trying to dereference contents of still incompletely read in types 12378 while reading in other DIEs. 12379 * Enable referencing still incompletely read in types just by a pointer to 12380 the type without accessing its fields. 12381 12382 Therefore caller should follow these rules: 12383 * Try to fetch any prerequisite types we may need to build this DIE type 12384 before building the type and calling set_die_type. 12385 * After building typer call set_die_type for current DIE as soon as 12386 possible before fetching more types to complete the current type. 12387 * Make the type as complete as possible before fetching more types. */ 12388 12389 static struct type * 12390 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu) 12391 { 12392 struct dwarf2_offset_and_type **slot, ofs; 12393 12394 /* For Ada types, make sure that the gnat-specific data is always 12395 initialized (if not already set). There are a few types where 12396 we should not be doing so, because the type-specific area is 12397 already used to hold some other piece of info (eg: TYPE_CODE_FLT 12398 where the type-specific area is used to store the floatformat). 12399 But this is not a problem, because the gnat-specific information 12400 is actually not needed for these types. */ 12401 if (need_gnat_info (cu) 12402 && TYPE_CODE (type) != TYPE_CODE_FUNC 12403 && TYPE_CODE (type) != TYPE_CODE_FLT 12404 && !HAVE_GNAT_AUX_INFO (type)) 12405 INIT_GNAT_SPECIFIC (type); 12406 12407 if (cu->type_hash == NULL) 12408 { 12409 gdb_assert (cu->per_cu != NULL); 12410 cu->per_cu->type_hash 12411 = htab_create_alloc_ex (cu->header.length / 24, 12412 offset_and_type_hash, 12413 offset_and_type_eq, 12414 NULL, 12415 &cu->objfile->objfile_obstack, 12416 hashtab_obstack_allocate, 12417 dummy_obstack_deallocate); 12418 cu->type_hash = cu->per_cu->type_hash; 12419 } 12420 12421 ofs.offset = die->offset; 12422 ofs.type = type; 12423 slot = (struct dwarf2_offset_and_type **) 12424 htab_find_slot_with_hash (cu->type_hash, &ofs, ofs.offset, INSERT); 12425 if (*slot) 12426 complaint (&symfile_complaints, 12427 _("A problem internal to GDB: DIE 0x%x has type already set"), 12428 die->offset); 12429 *slot = obstack_alloc (&cu->objfile->objfile_obstack, sizeof (**slot)); 12430 **slot = ofs; 12431 return type; 12432 } 12433 12434 /* Find the type for DIE in CU's type_hash, or return NULL if DIE does 12435 not have a saved type. */ 12436 12437 static struct type * 12438 get_die_type (struct die_info *die, struct dwarf2_cu *cu) 12439 { 12440 struct dwarf2_offset_and_type *slot, ofs; 12441 htab_t type_hash = cu->type_hash; 12442 12443 if (type_hash == NULL) 12444 return NULL; 12445 12446 ofs.offset = die->offset; 12447 slot = htab_find_with_hash (type_hash, &ofs, ofs.offset); 12448 if (slot) 12449 return slot->type; 12450 else 12451 return NULL; 12452 } 12453 12454 /* Add a dependence relationship from CU to REF_PER_CU. */ 12455 12456 static void 12457 dwarf2_add_dependence (struct dwarf2_cu *cu, 12458 struct dwarf2_per_cu_data *ref_per_cu) 12459 { 12460 void **slot; 12461 12462 if (cu->dependencies == NULL) 12463 cu->dependencies 12464 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer, 12465 NULL, &cu->comp_unit_obstack, 12466 hashtab_obstack_allocate, 12467 dummy_obstack_deallocate); 12468 12469 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT); 12470 if (*slot == NULL) 12471 *slot = ref_per_cu; 12472 } 12473 12474 /* Subroutine of dwarf2_mark to pass to htab_traverse. 12475 Set the mark field in every compilation unit in the 12476 cache that we must keep because we are keeping CU. */ 12477 12478 static int 12479 dwarf2_mark_helper (void **slot, void *data) 12480 { 12481 struct dwarf2_per_cu_data *per_cu; 12482 12483 per_cu = (struct dwarf2_per_cu_data *) *slot; 12484 if (per_cu->cu->mark) 12485 return 1; 12486 per_cu->cu->mark = 1; 12487 12488 if (per_cu->cu->dependencies != NULL) 12489 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL); 12490 12491 return 1; 12492 } 12493 12494 /* Set the mark field in CU and in every other compilation unit in the 12495 cache that we must keep because we are keeping CU. */ 12496 12497 static void 12498 dwarf2_mark (struct dwarf2_cu *cu) 12499 { 12500 if (cu->mark) 12501 return; 12502 cu->mark = 1; 12503 if (cu->dependencies != NULL) 12504 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL); 12505 } 12506 12507 static void 12508 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu) 12509 { 12510 while (per_cu) 12511 { 12512 per_cu->cu->mark = 0; 12513 per_cu = per_cu->cu->read_in_chain; 12514 } 12515 } 12516 12517 /* Trivial hash function for partial_die_info: the hash value of a DIE 12518 is its offset in .debug_info for this objfile. */ 12519 12520 static hashval_t 12521 partial_die_hash (const void *item) 12522 { 12523 const struct partial_die_info *part_die = item; 12524 12525 return part_die->offset; 12526 } 12527 12528 /* Trivial comparison function for partial_die_info structures: two DIEs 12529 are equal if they have the same offset. */ 12530 12531 static int 12532 partial_die_eq (const void *item_lhs, const void *item_rhs) 12533 { 12534 const struct partial_die_info *part_die_lhs = item_lhs; 12535 const struct partial_die_info *part_die_rhs = item_rhs; 12536 12537 return part_die_lhs->offset == part_die_rhs->offset; 12538 } 12539 12540 static struct cmd_list_element *set_dwarf2_cmdlist; 12541 static struct cmd_list_element *show_dwarf2_cmdlist; 12542 12543 static void 12544 set_dwarf2_cmd (char *args, int from_tty) 12545 { 12546 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout); 12547 } 12548 12549 static void 12550 show_dwarf2_cmd (char *args, int from_tty) 12551 { 12552 cmd_show_list (show_dwarf2_cmdlist, from_tty, ""); 12553 } 12554 12555 /* If section described by INFO was mmapped, munmap it now. */ 12556 12557 static void 12558 munmap_section_buffer (struct dwarf2_section_info *info) 12559 { 12560 if (info->was_mmapped) 12561 { 12562 #ifdef HAVE_MMAP 12563 intptr_t begin = (intptr_t) info->buffer; 12564 intptr_t map_begin = begin & ~(pagesize - 1); 12565 size_t map_length = info->size + begin - map_begin; 12566 12567 gdb_assert (munmap ((void *) map_begin, map_length) == 0); 12568 #else 12569 /* Without HAVE_MMAP, we should never be here to begin with. */ 12570 gdb_assert (0); 12571 #endif 12572 } 12573 } 12574 12575 /* munmap debug sections for OBJFILE, if necessary. */ 12576 12577 static void 12578 dwarf2_per_objfile_free (struct objfile *objfile, void *d) 12579 { 12580 struct dwarf2_per_objfile *data = d; 12581 12582 /* This is sorted according to the order they're defined in to make it easier 12583 to keep in sync. */ 12584 munmap_section_buffer (&data->info); 12585 munmap_section_buffer (&data->abbrev); 12586 munmap_section_buffer (&data->line); 12587 munmap_section_buffer (&data->loc); 12588 munmap_section_buffer (&data->macinfo); 12589 munmap_section_buffer (&data->str); 12590 munmap_section_buffer (&data->ranges); 12591 munmap_section_buffer (&data->types); 12592 munmap_section_buffer (&data->frame); 12593 munmap_section_buffer (&data->eh_frame); 12594 } 12595 12596 int dwarf2_always_disassemble; 12597 12598 static void 12599 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty, 12600 struct cmd_list_element *c, const char *value) 12601 { 12602 fprintf_filtered (file, _("\ 12603 Whether to always disassemble DWARF expressions is %s.\n"), 12604 value); 12605 } 12606 12607 void _initialize_dwarf2_read (void); 12608 12609 void 12610 _initialize_dwarf2_read (void) 12611 { 12612 dwarf2_objfile_data_key 12613 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free); 12614 12615 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\ 12616 Set DWARF 2 specific variables.\n\ 12617 Configure DWARF 2 variables such as the cache size"), 12618 &set_dwarf2_cmdlist, "maintenance set dwarf2 ", 12619 0/*allow-unknown*/, &maintenance_set_cmdlist); 12620 12621 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\ 12622 Show DWARF 2 specific variables\n\ 12623 Show DWARF 2 variables such as the cache size"), 12624 &show_dwarf2_cmdlist, "maintenance show dwarf2 ", 12625 0/*allow-unknown*/, &maintenance_show_cmdlist); 12626 12627 add_setshow_zinteger_cmd ("max-cache-age", class_obscure, 12628 &dwarf2_max_cache_age, _("\ 12629 Set the upper bound on the age of cached dwarf2 compilation units."), _("\ 12630 Show the upper bound on the age of cached dwarf2 compilation units."), _("\ 12631 A higher limit means that cached compilation units will be stored\n\ 12632 in memory longer, and more total memory will be used. Zero disables\n\ 12633 caching, which can slow down startup."), 12634 NULL, 12635 show_dwarf2_max_cache_age, 12636 &set_dwarf2_cmdlist, 12637 &show_dwarf2_cmdlist); 12638 12639 add_setshow_boolean_cmd ("always-disassemble", class_obscure, 12640 &dwarf2_always_disassemble, _("\ 12641 Set whether `info address' always disassembles DWARF expressions."), _("\ 12642 Show whether `info address' always disassembles DWARF expressions."), _("\ 12643 When enabled, DWARF expressions are always printed in an assembly-like\n\ 12644 syntax. When disabled, expressions will be printed in a more\n\ 12645 conversational style, when possible."), 12646 NULL, 12647 show_dwarf2_always_disassemble, 12648 &set_dwarf2_cmdlist, 12649 &show_dwarf2_cmdlist); 12650 12651 add_setshow_zinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\ 12652 Set debugging of the dwarf2 DIE reader."), _("\ 12653 Show debugging of the dwarf2 DIE reader."), _("\ 12654 When enabled (non-zero), DIEs are dumped after they are read in.\n\ 12655 The value is the maximum depth to print."), 12656 NULL, 12657 NULL, 12658 &setdebuglist, &showdebuglist); 12659 } 12660