gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2015 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #if !defined (SYMFILE_H)
  21 #define SYMFILE_H
  22
  23 /* This file requires that you first include "bfd.h".  */
  24 #include "symtab.h"
  25 #include "probe.h"
  26
  27 /* Opaque declarations.  */
  28 struct target_section;
  29 struct objfile;
  30 struct obj_section;
  31 struct obstack;
  32 struct block;
  33 struct probe;
  34 struct value;
  35 struct frame_info;
  36 struct agent_expr;
  37 struct axs_value;
  38
  39 /* Comparison function for symbol look ups.  */
  40
  41 typedef int (symbol_compare_ftype) (const char *string1,
  42                                     const char *string2);
  43
  44 /* Partial symbols are stored in the psymbol_cache and pointers to
  45    them are kept in a dynamically grown array that is obtained from
  46    malloc and grown as necessary via realloc.  Each objfile typically
  47    has two of these, one for global symbols and one for static
  48    symbols.  Although this adds a level of indirection for storing or
  49    accessing the partial symbols, it allows us to throw away duplicate
  50    psymbols and set all pointers to the single saved instance.  */
  51
  52 struct psymbol_allocation_list
  53 {
  54
  55   /* Pointer to beginning of dynamically allocated array of pointers
  56      to partial symbols.  The array is dynamically expanded as
  57      necessary to accommodate more pointers.  */
  58
  59   struct partial_symbol **list;
  60
  61   /* Pointer to next available slot in which to store a pointer to a
  62      partial symbol.  */
  63
  64   struct partial_symbol **next;
  65
  66   /* Number of allocated pointer slots in current dynamic array (not
  67      the number of bytes of storage).  The "next" pointer will always
  68      point somewhere between list[0] and list[size], and when at
  69      list[size] the array will be expanded on the next attempt to
  70      store a pointer.  */
  71
  72   int size;
  73 };
  74
  75 /* Define an array of addresses to accommodate non-contiguous dynamic
  76    loading of modules.  This is for use when entering commands, so we
  77    can keep track of the section names until we read the file and can
  78    map them to bfd sections.  This structure is also used by solib.c
  79    to communicate the section addresses in shared objects to
  80    symbol_file_add ().  */
  81
  82 struct section_addr_info
  83 {
  84   /* The number of sections for which address information is
  85      available.  */
  86   size_t num_sections;
  87   /* Sections whose names are file format dependent.  */
  88   struct other_sections
  89   {
  90     CORE_ADDR addr;
  91     char *name;
  92
  93     /* SECTINDEX must be valid for associated BFD or set to -1.  */
  94     int sectindex;
  95   } other[1];
  96 };
  97
  98
  99 /* A table listing the load segments in a symfile, and which segment
 100    each BFD section belongs to.  */
 101 struct symfile_segment_data
 102 {
 103   /* How many segments are present in this file.  If there are
 104      two, the text segment is the first one and the data segment
 105      is the second one.  */
 106   int num_segments;
 107
 108   /* If NUM_SEGMENTS is greater than zero, the original base address
 109      of each segment.  */
 110   CORE_ADDR *segment_bases;
 111
 112   /* If NUM_SEGMENTS is greater than zero, the memory size of each
 113      segment.  */
 114   CORE_ADDR *segment_sizes;
 115
 116   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
 117      recording which segment contains each BFD section.
 118      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
 119      S, or zero if it is not in any segment.  */
 120   int *segment_info;
 121 };
 122
 123 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
 124
 125 typedef void (symbol_filename_ftype) (const char *filename,
 126                                       const char *fullname, void *data);
 127
 128 /* Callback for quick_symbol_functions->expand_symtabs_matching
 129    to match a file name.  */
 130
 131 typedef int (expand_symtabs_file_matcher_ftype) (const char *filename,
 132                                                  void *data, int basenames);
 133
 134 /* Callback for quick_symbol_functions->expand_symtabs_matching
 135    to match a symbol name.  */
 136
 137 typedef int (expand_symtabs_symbol_matcher_ftype) (const char *name,
 138                                                    void *data);
 139
 140 /* Callback for quick_symbol_functions->expand_symtabs_matching
 141    to be called after a symtab has been expanded.  */
 142
 143 typedef void (expand_symtabs_exp_notify_ftype) \
 144   (struct compunit_symtab *symtab, void *data);
 145
 146 /* The "quick" symbol functions exist so that symbol readers can
 147    avoiding an initial read of all the symbols.  For example, symbol
 148    readers might choose to use the "partial symbol table" utilities,
 149    which is one implementation of the quick symbol functions.
 150
 151    The quick symbol functions are generally opaque: the underlying
 152    representation is hidden from the caller.
 153
 154    In general, these functions should only look at whatever special
 155    index the symbol reader creates -- looking through the symbol
 156    tables themselves is handled by generic code.  If a function is
 157    defined as returning a "symbol table", this means that the function
 158    should only return a newly-created symbol table; it should not
 159    examine pre-existing ones.
 160
 161    The exact list of functions here was determined in an ad hoc way
 162    based on gdb's history.  */
 163
 164 struct quick_symbol_functions
 165 {
 166   /* Return true if this objfile has any "partial" symbols
 167      available.  */
 168   int (*has_symbols) (struct objfile *objfile);
 169
 170   /* Return the symbol table for the "last" file appearing in
 171      OBJFILE.  */
 172   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 173
 174   /* Forget all cached full file names for OBJFILE.  */
 175   void (*forget_cached_source_info) (struct objfile *objfile);
 176
 177   /* Expand and iterate over each "partial" symbol table in OBJFILE
 178      where the source file is named NAME.
 179
 180      If NAME is not absolute, a match after a '/' in the symbol table's
 181      file name will also work, REAL_PATH is NULL then.  If NAME is
 182      absolute then REAL_PATH is non-NULL absolute file name as resolved
 183      via gdb_realpath from NAME.
 184
 185      If a match is found, the "partial" symbol table is expanded.
 186      Then, this calls iterate_over_some_symtabs (or equivalent) over
 187      all newly-created symbol tables, passing CALLBACK and DATA to it.
 188      The result of this call is returned.  */
 189   int (*map_symtabs_matching_filename) (struct objfile *objfile,
 190                                         const char *name,
 191                                         const char *real_path,
 192                                         int (*callback) (struct symtab *,
 193                                                          void *),
 194                                         void *data);
 195
 196   /* Check to see if the symbol is defined in a "partial" symbol table
 197      of OBJFILE.  BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
 198      depending on whether we want to search global symbols or static
 199      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 200      indicates what sort of symbol to search for.
 201
 202      Returns the newly-expanded compunit in which the symbol is
 203      defined, or NULL if no such symbol table exists.  If OBJFILE
 204      contains !TYPE_OPAQUE symbol prefer its compunit.  If it contains
 205      only TYPE_OPAQUE symbol(s), return at least that compunit.  */
 206   struct compunit_symtab *(*lookup_symbol) (struct objfile *objfile,
 207                                             int block_index, const char *name,
 208                                             domain_enum domain);
 209
 210   /* Print statistics about any indices loaded for OBJFILE.  The
 211      statistics should be printed to gdb_stdout.  This is used for
 212      "maint print statistics".  */
 213   void (*print_stats) (struct objfile *objfile);
 214
 215   /* Dump any indices loaded for OBJFILE.  The dump should go to
 216      gdb_stdout.  This is used for "maint print objfiles".  */
 217   void (*dump) (struct objfile *objfile);
 218
 219   /* This is called by objfile_relocate to relocate any indices loaded
 220      for OBJFILE.  */
 221   void (*relocate) (struct objfile *objfile,
 222                     const struct section_offsets *new_offsets,
 223                     const struct section_offsets *delta);
 224
 225   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 226      the corresponding symbol tables are loaded.  */
 227   void (*expand_symtabs_for_function) (struct objfile *objfile,
 228                                        const char *func_name);
 229
 230   /* Read all symbol tables associated with OBJFILE.  */
 231   void (*expand_all_symtabs) (struct objfile *objfile);
 232
 233   /* Read all symbol tables associated with OBJFILE which have
 234      symtab_to_fullname equal to FULLNAME.
 235      This is for the purposes of examining code only, e.g., expand_line_sal.
 236      The routine may ignore debug info that is known to not be useful with
 237      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 238   void (*expand_symtabs_with_fullname) (struct objfile *objfile,
 239                                         const char *fullname);
 240
 241   /* Find global or static symbols in all tables that are in NAMESPACE
 242      and for which MATCH (symbol name, NAME) == 0, passing each to
 243      CALLBACK, reading in partial symbol tables as needed.  Look
 244      through global symbols if GLOBAL and otherwise static symbols.
 245      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 246      found.  After each block is processed, passes NULL to CALLBACK.
 247      MATCH must be weaker than strcmp_iw_ordered in the sense that
 248      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 249      if non-null, must be an ordering relation compatible with
 250      strcmp_iw_ordered in the sense that
 251             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 252      and
 253             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 254      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 255      CALLBACK returns 0 to indicate that the scan should continue, or
 256      non-zero to indicate that the scan should be terminated.  */
 257
 258   void (*map_matching_symbols) (struct objfile *,
 259                                 const char *name, domain_enum namespace,
 260                                 int global,
 261                                 int (*callback) (struct block *,
 262                                                  struct symbol *, void *),
 263                                 void *data,
 264                                 symbol_compare_ftype *match,
 265                                 symbol_compare_ftype *ordered_compare);
 266
 267   /* Expand all symbol tables in OBJFILE matching some criteria.
 268
 269      FILE_MATCHER is called for each file in OBJFILE.  The file name
 270      and the DATA argument are passed to it.  If it returns zero, this
 271      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 272      If BASENAMES is non-zero the function should consider only base name of
 273      DATA (passed file name is already only the lbasename part).
 274
 275      Otherwise, if KIND does not match this symbol is skipped.
 276
 277      If even KIND matches, then SYMBOL_MATCHER is called for each symbol
 278      defined in the file.  The symbol "search" name and DATA are passed
 279      to SYMBOL_MATCHER.
 280
 281      If SYMBOL_MATCHER returns zero, then this symbol is skipped.
 282
 283      Otherwise, this symbol's symbol table is expanded.
 284
 285      DATA is user data that is passed unmodified to the callback
 286      functions.  */
 287   void (*expand_symtabs_matching)
 288     (struct objfile *objfile,
 289      expand_symtabs_file_matcher_ftype *file_matcher,
 290      expand_symtabs_symbol_matcher_ftype *symbol_matcher,
 291      expand_symtabs_exp_notify_ftype *expansion_notify,
 292      enum search_domain kind,
 293      void *data);
 294
 295   /* Return the comp unit from OBJFILE that contains PC and
 296      SECTION.  Return NULL if there is no such compunit.  This
 297      should return the compunit that contains a symbol whose
 298      address exactly matches PC, or, if there is no exact match, the
 299      compunit that contains a symbol whose address is closest to
 300      PC.  */
 301   struct compunit_symtab *(*find_pc_sect_compunit_symtab)
 302     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 303      CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
 304
 305   /* Call a callback for every file defined in OBJFILE whose symtab is
 306      not already read in.  FUN is the callback.  It is passed the file's
 307      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 308      the DATA passed to this function.  */
 309   void (*map_symbol_filenames) (struct objfile *objfile,
 310                                 symbol_filename_ftype *fun, void *data,
 311                                 int need_fullname);
 312 };
 313
 314 /* Structure of functions used for probe support.  If one of these functions
 315    is provided, all must be.  */
 316
 317 struct sym_probe_fns
 318 {
 319   /* If non-NULL, return an array of probe objects.
 320
 321      The returned value does not have to be freed and it has lifetime of the
 322      OBJFILE.  */
 323   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 324 };
 325
 326 /* Structure to keep track of symbol reading functions for various
 327    object file types.  */
 328
 329 struct sym_fns
 330 {
 331   /* Initializes anything that is global to the entire symbol table.
 332      It is called during symbol_file_add, when we begin debugging an
 333      entirely new program.  */
 334
 335   void (*sym_new_init) (struct objfile *);
 336
 337   /* Reads any initial information from a symbol file, and initializes
 338      the struct sym_fns SF in preparation for sym_read().  It is
 339      called every time we read a symbol file for any reason.  */
 340
 341   void (*sym_init) (struct objfile *);
 342
 343   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 344      (or possibly a symtab).  OBJFILE is the objfile struct for the
 345      file we are reading.  SYMFILE_FLAGS are the flags passed to
 346      symbol_file_add & co.  */
 347
 348   void (*sym_read) (struct objfile *, int);
 349
 350   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 351      gdb has to check other ways if this objfile has any symbols.  This may
 352      only be non-NULL if the objfile actually does have debuginfo available.
 353      */
 354
 355   void (*sym_read_psymbols) (struct objfile *);
 356
 357   /* Called when we are finished with an objfile.  Should do all
 358      cleanup that is specific to the object file format for the
 359      particular objfile.  */
 360
 361   void (*sym_finish) (struct objfile *);
 362
 363
 364   /* This function produces a file-dependent section_offsets
 365      structure, allocated in the objfile's storage.
 366
 367      The section_addr_info structure contains the offset of loadable and
 368      allocated sections, relative to the absolute offsets found in the BFD.  */
 369
 370   void (*sym_offsets) (struct objfile *, const struct section_addr_info *);
 371
 372   /* This function produces a format-independent description of
 373      the segments of ABFD.  Each segment is a unit of the file
 374      which may be relocated independently.  */
 375
 376   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 377
 378   /* This function should read the linetable from the objfile when
 379      the line table cannot be read while processing the debugging
 380      information.  */
 381
 382   void (*sym_read_linetable) (struct objfile *);
 383
 384   /* Relocate the contents of a debug section SECTP.  The
 385      contents are stored in BUF if it is non-NULL, or returned in a
 386      malloc'd buffer otherwise.  */
 387
 388   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 389
 390   /* If non-NULL, this objfile has probe support, and all the probe
 391      functions referred to here will be non-NULL.  */
 392   const struct sym_probe_fns *sym_probe_fns;
 393
 394   /* The "quick" (aka partial) symbol functions for this symbol
 395      reader.  */
 396   const struct quick_symbol_functions *qf;
 397 };
 398
 399 extern struct section_addr_info *
 400   build_section_addr_info_from_objfile (const struct objfile *objfile);
 401
 402 extern void relative_addr_info_to_section_offsets
 403   (struct section_offsets *section_offsets, int num_sections,
 404    const struct section_addr_info *addrs);
 405
 406 extern void addr_info_make_relative (struct section_addr_info *addrs,
 407                                      bfd *abfd);
 408
 409 /* The default version of sym_fns.sym_offsets for readers that don't
 410    do anything special.  */
 411
 412 extern void default_symfile_offsets (struct objfile *objfile,
 413                                      const struct section_addr_info *);
 414
 415 /* The default version of sym_fns.sym_segments for readers that don't
 416    do anything special.  */
 417
 418 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 419
 420 /* The default version of sym_fns.sym_relocate for readers that don't
 421    do anything special.  */
 422
 423 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 424                                            asection *sectp, bfd_byte *buf);
 425
 426 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 427   ATTRIBUTE_NONNULL (1);
 428
 429 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 430                                                          const char *)
 431   ATTRIBUTE_NONNULL (1);
 432
 433 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 434
 435 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 436
 437 extern void clear_symtab_users (int add_flags);
 438
 439 extern enum language deduce_language_from_filename (const char *);
 440
 441 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 442    symbol_file_add, etc.  */
 443
 444 enum symfile_add_flags
 445   {
 446     /* Be chatty about what you are doing.  */
 447     SYMFILE_VERBOSE = 1 << 1,
 448
 449     /* This is the main symbol file (as opposed to symbol file for dynamically
 450        loaded code).  */
 451     SYMFILE_MAINLINE = 1 << 2,
 452
 453     /* Do not call breakpoint_re_set when adding this symbol file.  */
 454     SYMFILE_DEFER_BP_RESET = 1 << 3,
 455
 456     /* Do not immediately read symbols for this file.  By default,
 457        symbols are read when the objfile is created.  */
 458     SYMFILE_NO_READ = 1 << 4
 459   };
 460
 461 extern struct objfile *symbol_file_add (const char *, int,
 462                                         struct section_addr_info *, int);
 463
 464 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, int,
 465                                                  struct section_addr_info *,
 466                                                  int, struct objfile *parent);
 467
 468 extern void symbol_file_add_separate (bfd *, const char *, int,
 469                                       struct objfile *);
 470
 471 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 472
 473 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 474
 475 extern struct section_addr_info *alloc_section_addr_info (size_t
 476                                                           num_sections);
 477
 478 /* Build (allocate and populate) a section_addr_info struct from an
 479    existing section table.  */
 480
 481 extern struct section_addr_info
 482   *build_section_addr_info_from_section_table (const struct target_section
 483                                                *start,
 484                                                const struct target_section
 485                                                *end);
 486
 487 /* Free all memory allocated by
 488    build_section_addr_info_from_section_table.  */
 489
 490 extern void free_section_addr_info (struct section_addr_info *);
 491
 492
 493                         /*   Variables   */
 494
 495 /* If non-zero, shared library symbols will be added automatically
 496    when the inferior is created, new libraries are loaded, or when
 497    attaching to the inferior.  This is almost always what users will
 498    want to have happen; but for very large programs, the startup time
 499    will be excessive, and so if this is a problem, the user can clear
 500    this flag and then add the shared library symbols as needed.  Note
 501    that there is a potential for confusion, since if the shared
 502    library symbols are not loaded, commands like "info fun" will *not*
 503    report all the functions that are actually present.  */
 504
 505 extern int auto_solib_add;
 506
 507 /* From symfile.c */
 508
 509 extern void set_initial_language (void);
 510
 511 extern void find_lowest_section (bfd *, asection *, void *);
 512
 513 extern bfd *symfile_bfd_open (const char *);
 514
 515 extern bfd *gdb_bfd_open_maybe_remote (const char *);
 516
 517 extern int get_section_index (struct objfile *, char *);
 518
 519 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 520
 521 /* Utility functions for overlay sections: */
 522 extern enum overlay_debugging_state
 523 {
 524   ovly_off,
 525   ovly_on,
 526   ovly_auto
 527 } overlay_debugging;
 528 extern int overlay_cache_invalid;
 529
 530 /* Return the "mapped" overlay section containing the PC.  */
 531 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 532
 533 /* Return any overlay section containing the PC (even in its LMA
 534    region).  */
 535 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 536
 537 /* Return true if the section is an overlay.  */
 538 extern int section_is_overlay (struct obj_section *);
 539
 540 /* Return true if the overlay section is currently "mapped".  */
 541 extern int section_is_mapped (struct obj_section *);
 542
 543 /* Return true if pc belongs to section's VMA.  */
 544 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 545
 546 /* Return true if pc belongs to section's LMA.  */
 547 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 548
 549 /* Map an address from a section's LMA to its VMA.  */
 550 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 551
 552 /* Map an address from a section's VMA to its LMA.  */
 553 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 554
 555 /* Convert an address in an overlay section (force into VMA range).  */
 556 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 557
 558 /* Load symbols from a file.  */
 559 extern void symbol_file_add_main (const char *args, int from_tty);
 560
 561 /* Clear GDB symbol tables.  */
 562 extern void symbol_file_clear (int from_tty);
 563
 564 /* Default overlay update function.  */
 565 extern void simple_overlay_update (struct obj_section *);
 566
 567 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 568                                                  bfd_byte *);
 569
 570 extern int symfile_map_offsets_to_segments (bfd *,
 571                                             const struct symfile_segment_data *,
 572                                             struct section_offsets *,
 573                                             int, const CORE_ADDR *);
 574 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 575 void free_symfile_segment_data (struct symfile_segment_data *data);
 576
 577 extern struct cleanup *increment_reading_symtab (void);
 578
 579 void expand_symtabs_matching (expand_symtabs_file_matcher_ftype *,
 580                               expand_symtabs_symbol_matcher_ftype *,
 581                               expand_symtabs_exp_notify_ftype *,
 582                               enum search_domain kind, void *data);
 583
 584 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 585                            int need_fullname);
 586
 587 /* From dwarf2read.c */
 588
 589 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 590    section name (usually from the DWARF standard), while the field COMPRESSED
 591    is the name of compressed sections.  If your object file format doesn't
 592    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 593    the debugging section is not supported, the field NORMAL can be NULL too.
 594    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 595    field.  */
 596
 597 struct dwarf2_section_names {
 598   const char *normal;
 599   const char *compressed;
 600 };
 601
 602 /* List of names for dward2 debugging sections.  Also most object file formats
 603    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 604    due to restrictions.
 605    The table for the standard names is defined in dwarf2read.c.  Please
 606    update all instances of dwarf2_debug_sections if you add a field to this
 607    structure.  It is always safe to use { NULL, NULL } in this case.  */
 608
 609 struct dwarf2_debug_sections {
 610   struct dwarf2_section_names info;
 611   struct dwarf2_section_names abbrev;
 612   struct dwarf2_section_names line;
 613   struct dwarf2_section_names loc;
 614   struct dwarf2_section_names macinfo;
 615   struct dwarf2_section_names macro;
 616   struct dwarf2_section_names str;
 617   struct dwarf2_section_names ranges;
 618   struct dwarf2_section_names types;
 619   struct dwarf2_section_names addr;
 620   struct dwarf2_section_names frame;
 621   struct dwarf2_section_names eh_frame;
 622   struct dwarf2_section_names gdb_index;
 623   /* This field has no meaning, but exists solely to catch changes to
 624      this structure which are not reflected in some instance.  */
 625   int sentinel;
 626 };
 627
 628 extern int dwarf2_has_info (struct objfile *,
 629                             const struct dwarf2_debug_sections *);
 630
 631 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 632 enum dwarf2_section_enum {
 633   DWARF2_DEBUG_FRAME,
 634   DWARF2_EH_FRAME
 635 };
 636
 637 extern void dwarf2_get_section_info (struct objfile *,
 638                                      enum dwarf2_section_enum,
 639                                      asection **, const gdb_byte **,
 640                                      bfd_size_type *);
 641
 642 extern int dwarf2_initialize_objfile (struct objfile *);
 643 extern void dwarf2_build_psymtabs (struct objfile *);
 644 extern void dwarf2_build_frame_info (struct objfile *);
 645
 646 void dwarf2_free_objfile (struct objfile *);
 647
 648 /* From mdebugread.c */
 649
 650 extern void mdebug_build_psymtabs (struct objfile *,
 651                                    const struct ecoff_debug_swap *,
 652                                    struct ecoff_debug_info *);
 653
 654 extern void elfmdebug_build_psymtabs (struct objfile *,
 655                                       const struct ecoff_debug_swap *,
 656                                       asection *);
 657
 658 /* From minidebug.c.  */
 659
 660 extern bfd *find_separate_debug_file_in_section (struct objfile *);
 661
 662 #endif /* !defined(SYMFILE_H) */