gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2017 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 #include "symfile-add-flags.h"
  27 #include "objfile-flags.h"
  28 #include "gdb_bfd.h"
  29 #include "common/function-view.h"
  30
  31 /* Opaque declarations.  */
  32 struct target_section;
  33 struct objfile;
  34 struct obj_section;
  35 struct obstack;
  36 struct block;
  37 struct probe;
  38 struct value;
  39 struct frame_info;
  40 struct agent_expr;
  41 struct axs_value;
  42
  43 /* Comparison function for symbol look ups.  */
  44
  45 typedef int (symbol_compare_ftype) (const char *string1,
  46                                     const char *string2);
  47
  48 struct other_sections
  49 {
  50   CORE_ADDR addr;
  51   char *name;
  52
  53   /* SECTINDEX must be valid for associated BFD or set to -1.  */
  54   int sectindex;
  55 };
  56
  57 /* Define an array of addresses to accommodate non-contiguous dynamic
  58    loading of modules.  This is for use when entering commands, so we
  59    can keep track of the section names until we read the file and can
  60    map them to bfd sections.  This structure is also used by solib.c
  61    to communicate the section addresses in shared objects to
  62    symbol_file_add ().  */
  63
  64 struct section_addr_info
  65 {
  66   /* The number of sections for which address information is
  67      available.  */
  68   size_t num_sections;
  69   /* Sections whose names are file format dependent.  */
  70   struct other_sections other[1];
  71 };
  72
  73
  74 /* A table listing the load segments in a symfile, and which segment
  75    each BFD section belongs to.  */
  76 struct symfile_segment_data
  77 {
  78   /* How many segments are present in this file.  If there are
  79      two, the text segment is the first one and the data segment
  80      is the second one.  */
  81   int num_segments;
  82
  83   /* If NUM_SEGMENTS is greater than zero, the original base address
  84      of each segment.  */
  85   CORE_ADDR *segment_bases;
  86
  87   /* If NUM_SEGMENTS is greater than zero, the memory size of each
  88      segment.  */
  89   CORE_ADDR *segment_sizes;
  90
  91   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
  92      recording which segment contains each BFD section.
  93      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
  94      S, or zero if it is not in any segment.  */
  95   int *segment_info;
  96 };
  97
  98 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
  99
 100 typedef void (symbol_filename_ftype) (const char *filename,
 101                                       const char *fullname, void *data);
 102
 103 /* Callback for quick_symbol_functions->expand_symtabs_matching
 104    to match a file name.  */
 105
 106 typedef bool (expand_symtabs_file_matcher_ftype) (const char *filename,
 107                                                   bool basenames);
 108
 109 /* Callback for quick_symbol_functions->expand_symtabs_matching
 110    to match a symbol name.  */
 111
 112 typedef bool (expand_symtabs_symbol_matcher_ftype) (const char *name);
 113
 114 /* Callback for quick_symbol_functions->expand_symtabs_matching
 115    to be called after a symtab has been expanded.  */
 116
 117 typedef void (expand_symtabs_exp_notify_ftype) (compunit_symtab *symtab);
 118
 119 /* The "quick" symbol functions exist so that symbol readers can
 120    avoiding an initial read of all the symbols.  For example, symbol
 121    readers might choose to use the "partial symbol table" utilities,
 122    which is one implementation of the quick symbol functions.
 123
 124    The quick symbol functions are generally opaque: the underlying
 125    representation is hidden from the caller.
 126
 127    In general, these functions should only look at whatever special
 128    index the symbol reader creates -- looking through the symbol
 129    tables themselves is handled by generic code.  If a function is
 130    defined as returning a "symbol table", this means that the function
 131    should only return a newly-created symbol table; it should not
 132    examine pre-existing ones.
 133
 134    The exact list of functions here was determined in an ad hoc way
 135    based on gdb's history.  */
 136
 137 struct quick_symbol_functions
 138 {
 139   /* Return true if this objfile has any "partial" symbols
 140      available.  */
 141   int (*has_symbols) (struct objfile *objfile);
 142
 143   /* Return the symbol table for the "last" file appearing in
 144      OBJFILE.  */
 145   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 146
 147   /* Forget all cached full file names for OBJFILE.  */
 148   void (*forget_cached_source_info) (struct objfile *objfile);
 149
 150   /* Expand and iterate over each "partial" symbol table in OBJFILE
 151      where the source file is named NAME.
 152
 153      If NAME is not absolute, a match after a '/' in the symbol table's
 154      file name will also work, REAL_PATH is NULL then.  If NAME is
 155      absolute then REAL_PATH is non-NULL absolute file name as resolved
 156      via gdb_realpath from NAME.
 157
 158      If a match is found, the "partial" symbol table is expanded.
 159      Then, this calls iterate_over_some_symtabs (or equivalent) over
 160      all newly-created symbol tables, passing CALLBACK to it.
 161      The result of this call is returned.  */
 162   bool (*map_symtabs_matching_filename)
 163     (struct objfile *objfile, const char *name, const char *real_path,
 164      gdb::function_view<bool (symtab *)> callback);
 165
 166   /* Check to see if the symbol is defined in a "partial" symbol table
 167      of OBJFILE.  BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
 168      depending on whether we want to search global symbols or static
 169      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 170      indicates what sort of symbol to search for.
 171
 172      Returns the newly-expanded compunit in which the symbol is
 173      defined, or NULL if no such symbol table exists.  If OBJFILE
 174      contains !TYPE_OPAQUE symbol prefer its compunit.  If it contains
 175      only TYPE_OPAQUE symbol(s), return at least that compunit.  */
 176   struct compunit_symtab *(*lookup_symbol) (struct objfile *objfile,
 177                                             int block_index, const char *name,
 178                                             domain_enum domain);
 179
 180   /* Print statistics about any indices loaded for OBJFILE.  The
 181      statistics should be printed to gdb_stdout.  This is used for
 182      "maint print statistics".  */
 183   void (*print_stats) (struct objfile *objfile);
 184
 185   /* Dump any indices loaded for OBJFILE.  The dump should go to
 186      gdb_stdout.  This is used for "maint print objfiles".  */
 187   void (*dump) (struct objfile *objfile);
 188
 189   /* This is called by objfile_relocate to relocate any indices loaded
 190      for OBJFILE.  */
 191   void (*relocate) (struct objfile *objfile,
 192                     const struct section_offsets *new_offsets,
 193                     const struct section_offsets *delta);
 194
 195   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 196      the corresponding symbol tables are loaded.  */
 197   void (*expand_symtabs_for_function) (struct objfile *objfile,
 198                                        const char *func_name);
 199
 200   /* Read all symbol tables associated with OBJFILE.  */
 201   void (*expand_all_symtabs) (struct objfile *objfile);
 202
 203   /* Read all symbol tables associated with OBJFILE which have
 204      symtab_to_fullname equal to FULLNAME.
 205      This is for the purposes of examining code only, e.g., expand_line_sal.
 206      The routine may ignore debug info that is known to not be useful with
 207      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 208   void (*expand_symtabs_with_fullname) (struct objfile *objfile,
 209                                         const char *fullname);
 210
 211   /* Find global or static symbols in all tables that are in DOMAIN
 212      and for which MATCH (symbol name, NAME) == 0, passing each to
 213      CALLBACK, reading in partial symbol tables as needed.  Look
 214      through global symbols if GLOBAL and otherwise static symbols.
 215      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 216      found.  After each block is processed, passes NULL to CALLBACK.
 217      MATCH must be weaker than strcmp_iw_ordered in the sense that
 218      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 219      if non-null, must be an ordering relation compatible with
 220      strcmp_iw_ordered in the sense that
 221             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 222      and
 223             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 224      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 225      CALLBACK returns 0 to indicate that the scan should continue, or
 226      non-zero to indicate that the scan should be terminated.  */
 227
 228   void (*map_matching_symbols) (struct objfile *,
 229                                 const char *name, domain_enum domain,
 230                                 int global,
 231                                 int (*callback) (struct block *,
 232                                                  struct symbol *, void *),
 233                                 void *data,
 234                                 symbol_name_match_type match,
 235                                 symbol_compare_ftype *ordered_compare);
 236
 237   /* Expand all symbol tables in OBJFILE matching some criteria.
 238
 239      FILE_MATCHER is called for each file in OBJFILE.  The file name
 240      is passed to it.  If the matcher returns false, the file is
 241      skipped.  If FILE_MATCHER is NULL the file is not skipped.  If
 242      BASENAMES is true the matcher should consider only file base
 243      names (the passed file name is already only the lbasename'd
 244      part).
 245
 246      Otherwise, if KIND does not match, this symbol is skipped.
 247
 248      If even KIND matches, SYMBOL_MATCHER is called for each symbol
 249      defined in the file.  The symbol "search" name is passed to
 250      SYMBOL_MATCHER.
 251
 252      If SYMBOL_MATCHER returns false, then the symbol is skipped.
 253
 254      Otherwise, the symbol's symbol table is expanded.  */
 255   void (*expand_symtabs_matching)
 256     (struct objfile *objfile,
 257      gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 258      const lookup_name_info &lookup_name,
 259      gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 260      gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 261      enum search_domain kind);
 262
 263   /* Return the comp unit from OBJFILE that contains PC and
 264      SECTION.  Return NULL if there is no such compunit.  This
 265      should return the compunit that contains a symbol whose
 266      address exactly matches PC, or, if there is no exact match, the
 267      compunit that contains a symbol whose address is closest to
 268      PC.  */
 269   struct compunit_symtab *(*find_pc_sect_compunit_symtab)
 270     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 271      CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
 272
 273   /* Return the comp unit from OBJFILE that contains a symbol at
 274      ADDRESS.  Return NULL if there is no such comp unit.  Unlike
 275      find_pc_sect_compunit_symtab, any sort of symbol (not just text
 276      symbols) can be considered, and only exact address matches are
 277      considered.  This pointer may be NULL.  */
 278   struct compunit_symtab *(*find_compunit_symtab_by_address)
 279     (struct objfile *objfile, CORE_ADDR address);
 280
 281   /* Call a callback for every file defined in OBJFILE whose symtab is
 282      not already read in.  FUN is the callback.  It is passed the file's
 283      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 284      the DATA passed to this function.  */
 285   void (*map_symbol_filenames) (struct objfile *objfile,
 286                                 symbol_filename_ftype *fun, void *data,
 287                                 int need_fullname);
 288 };
 289
 290 /* Structure of functions used for probe support.  If one of these functions
 291    is provided, all must be.  */
 292
 293 struct sym_probe_fns
 294 {
 295   /* If non-NULL, return a reference to vector of probe objects.  */
 296   const std::vector<probe *> &(*sym_get_probes) (struct objfile *);
 297 };
 298
 299 /* Structure to keep track of symbol reading functions for various
 300    object file types.  */
 301
 302 struct sym_fns
 303 {
 304   /* Initializes anything that is global to the entire symbol table.
 305      It is called during symbol_file_add, when we begin debugging an
 306      entirely new program.  */
 307
 308   void (*sym_new_init) (struct objfile *);
 309
 310   /* Reads any initial information from a symbol file, and initializes
 311      the struct sym_fns SF in preparation for sym_read().  It is
 312      called every time we read a symbol file for any reason.  */
 313
 314   void (*sym_init) (struct objfile *);
 315
 316   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 317      (or possibly a symtab).  OBJFILE is the objfile struct for the
 318      file we are reading.  SYMFILE_FLAGS are the flags passed to
 319      symbol_file_add & co.  */
 320
 321   void (*sym_read) (struct objfile *, symfile_add_flags);
 322
 323   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 324      gdb has to check other ways if this objfile has any symbols.  This may
 325      only be non-NULL if the objfile actually does have debuginfo available.
 326      */
 327
 328   void (*sym_read_psymbols) (struct objfile *);
 329
 330   /* Called when we are finished with an objfile.  Should do all
 331      cleanup that is specific to the object file format for the
 332      particular objfile.  */
 333
 334   void (*sym_finish) (struct objfile *);
 335
 336
 337   /* This function produces a file-dependent section_offsets
 338      structure, allocated in the objfile's storage.
 339
 340      The section_addr_info structure contains the offset of loadable and
 341      allocated sections, relative to the absolute offsets found in the BFD.  */
 342
 343   void (*sym_offsets) (struct objfile *, const struct section_addr_info *);
 344
 345   /* This function produces a format-independent description of
 346      the segments of ABFD.  Each segment is a unit of the file
 347      which may be relocated independently.  */
 348
 349   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 350
 351   /* This function should read the linetable from the objfile when
 352      the line table cannot be read while processing the debugging
 353      information.  */
 354
 355   void (*sym_read_linetable) (struct objfile *);
 356
 357   /* Relocate the contents of a debug section SECTP.  The
 358      contents are stored in BUF if it is non-NULL, or returned in a
 359      malloc'd buffer otherwise.  */
 360
 361   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 362
 363   /* If non-NULL, this objfile has probe support, and all the probe
 364      functions referred to here will be non-NULL.  */
 365   const struct sym_probe_fns *sym_probe_fns;
 366
 367   /* The "quick" (aka partial) symbol functions for this symbol
 368      reader.  */
 369   const struct quick_symbol_functions *qf;
 370 };
 371
 372 extern struct section_addr_info *
 373   build_section_addr_info_from_objfile (const struct objfile *objfile);
 374
 375 extern void relative_addr_info_to_section_offsets
 376   (struct section_offsets *section_offsets, int num_sections,
 377    const struct section_addr_info *addrs);
 378
 379 extern void addr_info_make_relative (struct section_addr_info *addrs,
 380                                      bfd *abfd);
 381
 382 /* The default version of sym_fns.sym_offsets for readers that don't
 383    do anything special.  */
 384
 385 extern void default_symfile_offsets (struct objfile *objfile,
 386                                      const struct section_addr_info *);
 387
 388 /* The default version of sym_fns.sym_segments for readers that don't
 389    do anything special.  */
 390
 391 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 392
 393 /* The default version of sym_fns.sym_relocate for readers that don't
 394    do anything special.  */
 395
 396 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 397                                            asection *sectp, bfd_byte *buf);
 398
 399 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 400   ATTRIBUTE_NONNULL (1);
 401
 402 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 403                                                          const char *)
 404   ATTRIBUTE_NONNULL (1);
 405
 406 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 407
 408 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 409
 410 extern void clear_symtab_users (symfile_add_flags add_flags);
 411
 412 extern enum language deduce_language_from_filename (const char *);
 413
 414 /* Map the filename extension EXT to the language LANG.  Any previous
 415    association of EXT will be removed.  EXT will be copied by this
 416    function.  */
 417 extern void add_filename_language (const char *ext, enum language lang);
 418
 419 extern struct objfile *symbol_file_add (const char *, symfile_add_flags,
 420                                         struct section_addr_info *, objfile_flags);
 421
 422 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, symfile_add_flags,
 423                                                  struct section_addr_info *,
 424                                                  objfile_flags, struct objfile *parent);
 425
 426 extern void symbol_file_add_separate (bfd *, const char *, symfile_add_flags,
 427                                       struct objfile *);
 428
 429 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 430
 431 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 432
 433 extern struct section_addr_info *alloc_section_addr_info (size_t
 434                                                           num_sections);
 435
 436 /* Build (allocate and populate) a section_addr_info struct from an
 437    existing section table.  */
 438
 439 extern struct section_addr_info
 440   *build_section_addr_info_from_section_table (const struct target_section
 441                                                *start,
 442                                                const struct target_section
 443                                                *end);
 444
 445 /* Free all memory allocated by
 446    build_section_addr_info_from_section_table.  */
 447
 448 extern void free_section_addr_info (struct section_addr_info *);
 449
 450
 451                         /*   Variables   */
 452
 453 /* If non-zero, shared library symbols will be added automatically
 454    when the inferior is created, new libraries are loaded, or when
 455    attaching to the inferior.  This is almost always what users will
 456    want to have happen; but for very large programs, the startup time
 457    will be excessive, and so if this is a problem, the user can clear
 458    this flag and then add the shared library symbols as needed.  Note
 459    that there is a potential for confusion, since if the shared
 460    library symbols are not loaded, commands like "info fun" will *not*
 461    report all the functions that are actually present.  */
 462
 463 extern int auto_solib_add;
 464
 465 /* From symfile.c */
 466
 467 extern void set_initial_language (void);
 468
 469 extern void find_lowest_section (bfd *, asection *, void *);
 470
 471 extern gdb_bfd_ref_ptr symfile_bfd_open (const char *);
 472
 473 extern int get_section_index (struct objfile *, const char *);
 474
 475 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 476
 477 /* Utility functions for overlay sections: */
 478 extern enum overlay_debugging_state
 479 {
 480   ovly_off,
 481   ovly_on,
 482   ovly_auto
 483 } overlay_debugging;
 484 extern int overlay_cache_invalid;
 485
 486 /* Return the "mapped" overlay section containing the PC.  */
 487 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 488
 489 /* Return any overlay section containing the PC (even in its LMA
 490    region).  */
 491 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 492
 493 /* Return true if the section is an overlay.  */
 494 extern int section_is_overlay (struct obj_section *);
 495
 496 /* Return true if the overlay section is currently "mapped".  */
 497 extern int section_is_mapped (struct obj_section *);
 498
 499 /* Return true if pc belongs to section's VMA.  */
 500 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 501
 502 /* Return true if pc belongs to section's LMA.  */
 503 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 504
 505 /* Map an address from a section's LMA to its VMA.  */
 506 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 507
 508 /* Map an address from a section's VMA to its LMA.  */
 509 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 510
 511 /* Convert an address in an overlay section (force into VMA range).  */
 512 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 513
 514 /* Load symbols from a file.  */
 515 extern void symbol_file_add_main (const char *args,
 516                                   symfile_add_flags add_flags);
 517
 518 /* Clear GDB symbol tables.  */
 519 extern void symbol_file_clear (int from_tty);
 520
 521 /* Default overlay update function.  */
 522 extern void simple_overlay_update (struct obj_section *);
 523
 524 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 525                                                  bfd_byte *);
 526
 527 extern int symfile_map_offsets_to_segments (bfd *,
 528                                             const struct symfile_segment_data *,
 529                                             struct section_offsets *,
 530                                             int, const CORE_ADDR *);
 531 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 532 void free_symfile_segment_data (struct symfile_segment_data *data);
 533
 534 extern scoped_restore_tmpl<int> increment_reading_symtab (void);
 535
 536 void expand_symtabs_matching
 537   (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 538    const lookup_name_info &lookup_name,
 539    gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 540    gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 541    enum search_domain kind);
 542
 543 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 544                            int need_fullname);
 545
 546 /* From dwarf2read.c */
 547
 548 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 549    section name (usually from the DWARF standard), while the field COMPRESSED
 550    is the name of compressed sections.  If your object file format doesn't
 551    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 552    the debugging section is not supported, the field NORMAL can be NULL too.
 553    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 554    field.  */
 555
 556 struct dwarf2_section_names {
 557   const char *normal;
 558   const char *compressed;
 559 };
 560
 561 /* List of names for dward2 debugging sections.  Also most object file formats
 562    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 563    due to restrictions.
 564    The table for the standard names is defined in dwarf2read.c.  Please
 565    update all instances of dwarf2_debug_sections if you add a field to this
 566    structure.  It is always safe to use { NULL, NULL } in this case.  */
 567
 568 struct dwarf2_debug_sections {
 569   struct dwarf2_section_names info;
 570   struct dwarf2_section_names abbrev;
 571   struct dwarf2_section_names line;
 572   struct dwarf2_section_names loc;
 573   struct dwarf2_section_names loclists;
 574   struct dwarf2_section_names macinfo;
 575   struct dwarf2_section_names macro;
 576   struct dwarf2_section_names str;
 577   struct dwarf2_section_names line_str;
 578   struct dwarf2_section_names ranges;
 579   struct dwarf2_section_names rnglists;
 580   struct dwarf2_section_names types;
 581   struct dwarf2_section_names addr;
 582   struct dwarf2_section_names frame;
 583   struct dwarf2_section_names eh_frame;
 584   struct dwarf2_section_names gdb_index;
 585   /* This field has no meaning, but exists solely to catch changes to
 586      this structure which are not reflected in some instance.  */
 587   int sentinel;
 588 };
 589
 590 extern int dwarf2_has_info (struct objfile *,
 591                             const struct dwarf2_debug_sections *);
 592
 593 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 594 enum dwarf2_section_enum {
 595   DWARF2_DEBUG_FRAME,
 596   DWARF2_EH_FRAME
 597 };
 598
 599 extern void dwarf2_get_section_info (struct objfile *,
 600                                      enum dwarf2_section_enum,
 601                                      asection **, const gdb_byte **,
 602                                      bfd_size_type *);
 603
 604 extern int dwarf2_initialize_objfile (struct objfile *);
 605 extern void dwarf2_build_psymtabs (struct objfile *);
 606 extern void dwarf2_build_frame_info (struct objfile *);
 607
 608 void dwarf2_free_objfile (struct objfile *);
 609
 610 /* From mdebugread.c */
 611
 612 extern void mdebug_build_psymtabs (minimal_symbol_reader &,
 613                                    struct objfile *,
 614                                    const struct ecoff_debug_swap *,
 615                                    struct ecoff_debug_info *);
 616
 617 extern void elfmdebug_build_psymtabs (struct objfile *,
 618                                       const struct ecoff_debug_swap *,
 619                                       asection *);
 620
 621 /* From minidebug.c.  */
 622
 623 extern gdb_bfd_ref_ptr find_separate_debug_file_in_section (struct objfile *);
 624
 625 /* True if we are printing debug output about separate debug info files.  */
 626
 627 extern int separate_debug_file_debug;
 628
 629 #endif /* !defined(SYMFILE_H) */