gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2016 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
  29 /* Opaque declarations.  */
  30 struct target_section;
  31 struct objfile;
  32 struct obj_section;
  33 struct obstack;
  34 struct block;
  35 struct probe;
  36 struct value;
  37 struct frame_info;
  38 struct agent_expr;
  39 struct axs_value;
  40
  41 /* Comparison function for symbol look ups.  */
  42
  43 typedef int (symbol_compare_ftype) (const char *string1,
  44                                     const char *string2);
  45
  46 /* Partial symbols are stored in the psymbol_cache and pointers to
  47    them are kept in a dynamically grown array that is obtained from
  48    malloc and grown as necessary via realloc.  Each objfile typically
  49    has two of these, one for global symbols and one for static
  50    symbols.  Although this adds a level of indirection for storing or
  51    accessing the partial symbols, it allows us to throw away duplicate
  52    psymbols and set all pointers to the single saved instance.  */
  53
  54 struct psymbol_allocation_list
  55 {
  56
  57   /* Pointer to beginning of dynamically allocated array of pointers
  58      to partial symbols.  The array is dynamically expanded as
  59      necessary to accommodate more pointers.  */
  60
  61   struct partial_symbol **list;
  62
  63   /* Pointer to next available slot in which to store a pointer to a
  64      partial symbol.  */
  65
  66   struct partial_symbol **next;
  67
  68   /* Number of allocated pointer slots in current dynamic array (not
  69      the number of bytes of storage).  The "next" pointer will always
  70      point somewhere between list[0] and list[size], and when at
  71      list[size] the array will be expanded on the next attempt to
  72      store a pointer.  */
  73
  74   int size;
  75 };
  76
  77 struct other_sections
  78 {
  79   CORE_ADDR addr;
  80   char *name;
  81
  82   /* SECTINDEX must be valid for associated BFD or set to -1.  */
  83   int sectindex;
  84 };
  85
  86 /* Define an array of addresses to accommodate non-contiguous dynamic
  87    loading of modules.  This is for use when entering commands, so we
  88    can keep track of the section names until we read the file and can
  89    map them to bfd sections.  This structure is also used by solib.c
  90    to communicate the section addresses in shared objects to
  91    symbol_file_add ().  */
  92
  93 struct section_addr_info
  94 {
  95   /* The number of sections for which address information is
  96      available.  */
  97   size_t num_sections;
  98   /* Sections whose names are file format dependent.  */
  99   struct other_sections other[1];
 100 };
 101
 102
 103 /* A table listing the load segments in a symfile, and which segment
 104    each BFD section belongs to.  */
 105 struct symfile_segment_data
 106 {
 107   /* How many segments are present in this file.  If there are
 108      two, the text segment is the first one and the data segment
 109      is the second one.  */
 110   int num_segments;
 111
 112   /* If NUM_SEGMENTS is greater than zero, the original base address
 113      of each segment.  */
 114   CORE_ADDR *segment_bases;
 115
 116   /* If NUM_SEGMENTS is greater than zero, the memory size of each
 117      segment.  */
 118   CORE_ADDR *segment_sizes;
 119
 120   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
 121      recording which segment contains each BFD section.
 122      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
 123      S, or zero if it is not in any segment.  */
 124   int *segment_info;
 125 };
 126
 127 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
 128
 129 typedef void (symbol_filename_ftype) (const char *filename,
 130                                       const char *fullname, void *data);
 131
 132 /* Callback for quick_symbol_functions->expand_symtabs_matching
 133    to match a file name.  */
 134
 135 typedef int (expand_symtabs_file_matcher_ftype) (const char *filename,
 136                                                  void *data, int basenames);
 137
 138 /* Callback for quick_symbol_functions->expand_symtabs_matching
 139    to match a symbol name.  */
 140
 141 typedef int (expand_symtabs_symbol_matcher_ftype) (const char *name,
 142                                                    void *data);
 143
 144 /* Callback for quick_symbol_functions->expand_symtabs_matching
 145    to be called after a symtab has been expanded.  */
 146
 147 typedef void (expand_symtabs_exp_notify_ftype) \
 148   (struct compunit_symtab *symtab, void *data);
 149
 150 /* The "quick" symbol functions exist so that symbol readers can
 151    avoiding an initial read of all the symbols.  For example, symbol
 152    readers might choose to use the "partial symbol table" utilities,
 153    which is one implementation of the quick symbol functions.
 154
 155    The quick symbol functions are generally opaque: the underlying
 156    representation is hidden from the caller.
 157
 158    In general, these functions should only look at whatever special
 159    index the symbol reader creates -- looking through the symbol
 160    tables themselves is handled by generic code.  If a function is
 161    defined as returning a "symbol table", this means that the function
 162    should only return a newly-created symbol table; it should not
 163    examine pre-existing ones.
 164
 165    The exact list of functions here was determined in an ad hoc way
 166    based on gdb's history.  */
 167
 168 struct quick_symbol_functions
 169 {
 170   /* Return true if this objfile has any "partial" symbols
 171      available.  */
 172   int (*has_symbols) (struct objfile *objfile);
 173
 174   /* Return the symbol table for the "last" file appearing in
 175      OBJFILE.  */
 176   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 177
 178   /* Forget all cached full file names for OBJFILE.  */
 179   void (*forget_cached_source_info) (struct objfile *objfile);
 180
 181   /* Expand and iterate over each "partial" symbol table in OBJFILE
 182      where the source file is named NAME.
 183
 184      If NAME is not absolute, a match after a '/' in the symbol table's
 185      file name will also work, REAL_PATH is NULL then.  If NAME is
 186      absolute then REAL_PATH is non-NULL absolute file name as resolved
 187      via gdb_realpath from NAME.
 188
 189      If a match is found, the "partial" symbol table is expanded.
 190      Then, this calls iterate_over_some_symtabs (or equivalent) over
 191      all newly-created symbol tables, passing CALLBACK and DATA to it.
 192      The result of this call is returned.  */
 193   int (*map_symtabs_matching_filename) (struct objfile *objfile,
 194                                         const char *name,
 195                                         const char *real_path,
 196                                         int (*callback) (struct symtab *,
 197                                                          void *),
 198                                         void *data);
 199
 200   /* Check to see if the symbol is defined in a "partial" symbol table
 201      of OBJFILE.  BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
 202      depending on whether we want to search global symbols or static
 203      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 204      indicates what sort of symbol to search for.
 205
 206      Returns the newly-expanded compunit in which the symbol is
 207      defined, or NULL if no such symbol table exists.  If OBJFILE
 208      contains !TYPE_OPAQUE symbol prefer its compunit.  If it contains
 209      only TYPE_OPAQUE symbol(s), return at least that compunit.  */
 210   struct compunit_symtab *(*lookup_symbol) (struct objfile *objfile,
 211                                             int block_index, const char *name,
 212                                             domain_enum domain);
 213
 214   /* Print statistics about any indices loaded for OBJFILE.  The
 215      statistics should be printed to gdb_stdout.  This is used for
 216      "maint print statistics".  */
 217   void (*print_stats) (struct objfile *objfile);
 218
 219   /* Dump any indices loaded for OBJFILE.  The dump should go to
 220      gdb_stdout.  This is used for "maint print objfiles".  */
 221   void (*dump) (struct objfile *objfile);
 222
 223   /* This is called by objfile_relocate to relocate any indices loaded
 224      for OBJFILE.  */
 225   void (*relocate) (struct objfile *objfile,
 226                     const struct section_offsets *new_offsets,
 227                     const struct section_offsets *delta);
 228
 229   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 230      the corresponding symbol tables are loaded.  */
 231   void (*expand_symtabs_for_function) (struct objfile *objfile,
 232                                        const char *func_name);
 233
 234   /* Read all symbol tables associated with OBJFILE.  */
 235   void (*expand_all_symtabs) (struct objfile *objfile);
 236
 237   /* Read all symbol tables associated with OBJFILE which have
 238      symtab_to_fullname equal to FULLNAME.
 239      This is for the purposes of examining code only, e.g., expand_line_sal.
 240      The routine may ignore debug info that is known to not be useful with
 241      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 242   void (*expand_symtabs_with_fullname) (struct objfile *objfile,
 243                                         const char *fullname);
 244
 245   /* Find global or static symbols in all tables that are in DOMAIN
 246      and for which MATCH (symbol name, NAME) == 0, passing each to
 247      CALLBACK, reading in partial symbol tables as needed.  Look
 248      through global symbols if GLOBAL and otherwise static symbols.
 249      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 250      found.  After each block is processed, passes NULL to CALLBACK.
 251      MATCH must be weaker than strcmp_iw_ordered in the sense that
 252      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 253      if non-null, must be an ordering relation compatible with
 254      strcmp_iw_ordered in the sense that
 255             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 256      and
 257             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 258      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 259      CALLBACK returns 0 to indicate that the scan should continue, or
 260      non-zero to indicate that the scan should be terminated.  */
 261
 262   void (*map_matching_symbols) (struct objfile *,
 263                                 const char *name, domain_enum domain,
 264                                 int global,
 265                                 int (*callback) (struct block *,
 266                                                  struct symbol *, void *),
 267                                 void *data,
 268                                 symbol_compare_ftype *match,
 269                                 symbol_compare_ftype *ordered_compare);
 270
 271   /* Expand all symbol tables in OBJFILE matching some criteria.
 272
 273      FILE_MATCHER is called for each file in OBJFILE.  The file name
 274      and the DATA argument are passed to it.  If it returns zero, this
 275      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 276      If BASENAMES is non-zero the function should consider only base name of
 277      DATA (passed file name is already only the lbasename part).
 278
 279      Otherwise, if KIND does not match this symbol is skipped.
 280
 281      If even KIND matches, then SYMBOL_MATCHER is called for each symbol
 282      defined in the file.  The symbol "search" name and DATA are passed
 283      to SYMBOL_MATCHER.
 284
 285      If SYMBOL_MATCHER returns zero, then this symbol is skipped.
 286
 287      Otherwise, this symbol's symbol table is expanded.
 288
 289      DATA is user data that is passed unmodified to the callback
 290      functions.  */
 291   void (*expand_symtabs_matching)
 292     (struct objfile *objfile,
 293      expand_symtabs_file_matcher_ftype *file_matcher,
 294      expand_symtabs_symbol_matcher_ftype *symbol_matcher,
 295      expand_symtabs_exp_notify_ftype *expansion_notify,
 296      enum search_domain kind,
 297      void *data);
 298
 299   /* Return the comp unit from OBJFILE that contains PC and
 300      SECTION.  Return NULL if there is no such compunit.  This
 301      should return the compunit that contains a symbol whose
 302      address exactly matches PC, or, if there is no exact match, the
 303      compunit that contains a symbol whose address is closest to
 304      PC.  */
 305   struct compunit_symtab *(*find_pc_sect_compunit_symtab)
 306     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 307      CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
 308
 309   /* Call a callback for every file defined in OBJFILE whose symtab is
 310      not already read in.  FUN is the callback.  It is passed the file's
 311      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 312      the DATA passed to this function.  */
 313   void (*map_symbol_filenames) (struct objfile *objfile,
 314                                 symbol_filename_ftype *fun, void *data,
 315                                 int need_fullname);
 316 };
 317
 318 /* Structure of functions used for probe support.  If one of these functions
 319    is provided, all must be.  */
 320
 321 struct sym_probe_fns
 322 {
 323   /* If non-NULL, return an array of probe objects.
 324
 325      The returned value does not have to be freed and it has lifetime of the
 326      OBJFILE.  */
 327   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 328 };
 329
 330 /* Structure to keep track of symbol reading functions for various
 331    object file types.  */
 332
 333 struct sym_fns
 334 {
 335   /* Initializes anything that is global to the entire symbol table.
 336      It is called during symbol_file_add, when we begin debugging an
 337      entirely new program.  */
 338
 339   void (*sym_new_init) (struct objfile *);
 340
 341   /* Reads any initial information from a symbol file, and initializes
 342      the struct sym_fns SF in preparation for sym_read().  It is
 343      called every time we read a symbol file for any reason.  */
 344
 345   void (*sym_init) (struct objfile *);
 346
 347   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 348      (or possibly a symtab).  OBJFILE is the objfile struct for the
 349      file we are reading.  SYMFILE_FLAGS are the flags passed to
 350      symbol_file_add & co.  */
 351
 352   void (*sym_read) (struct objfile *, symfile_add_flags);
 353
 354   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 355      gdb has to check other ways if this objfile has any symbols.  This may
 356      only be non-NULL if the objfile actually does have debuginfo available.
 357      */
 358
 359   void (*sym_read_psymbols) (struct objfile *);
 360
 361   /* Called when we are finished with an objfile.  Should do all
 362      cleanup that is specific to the object file format for the
 363      particular objfile.  */
 364
 365   void (*sym_finish) (struct objfile *);
 366
 367
 368   /* This function produces a file-dependent section_offsets
 369      structure, allocated in the objfile's storage.
 370
 371      The section_addr_info structure contains the offset of loadable and
 372      allocated sections, relative to the absolute offsets found in the BFD.  */
 373
 374   void (*sym_offsets) (struct objfile *, const struct section_addr_info *);
 375
 376   /* This function produces a format-independent description of
 377      the segments of ABFD.  Each segment is a unit of the file
 378      which may be relocated independently.  */
 379
 380   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 381
 382   /* This function should read the linetable from the objfile when
 383      the line table cannot be read while processing the debugging
 384      information.  */
 385
 386   void (*sym_read_linetable) (struct objfile *);
 387
 388   /* Relocate the contents of a debug section SECTP.  The
 389      contents are stored in BUF if it is non-NULL, or returned in a
 390      malloc'd buffer otherwise.  */
 391
 392   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 393
 394   /* If non-NULL, this objfile has probe support, and all the probe
 395      functions referred to here will be non-NULL.  */
 396   const struct sym_probe_fns *sym_probe_fns;
 397
 398   /* The "quick" (aka partial) symbol functions for this symbol
 399      reader.  */
 400   const struct quick_symbol_functions *qf;
 401 };
 402
 403 extern struct section_addr_info *
 404   build_section_addr_info_from_objfile (const struct objfile *objfile);
 405
 406 extern void relative_addr_info_to_section_offsets
 407   (struct section_offsets *section_offsets, int num_sections,
 408    const struct section_addr_info *addrs);
 409
 410 extern void addr_info_make_relative (struct section_addr_info *addrs,
 411                                      bfd *abfd);
 412
 413 /* The default version of sym_fns.sym_offsets for readers that don't
 414    do anything special.  */
 415
 416 extern void default_symfile_offsets (struct objfile *objfile,
 417                                      const struct section_addr_info *);
 418
 419 /* The default version of sym_fns.sym_segments for readers that don't
 420    do anything special.  */
 421
 422 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 423
 424 /* The default version of sym_fns.sym_relocate for readers that don't
 425    do anything special.  */
 426
 427 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 428                                            asection *sectp, bfd_byte *buf);
 429
 430 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 431   ATTRIBUTE_NONNULL (1);
 432
 433 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 434                                                          const char *)
 435   ATTRIBUTE_NONNULL (1);
 436
 437 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 438
 439 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 440
 441 extern void clear_symtab_users (symfile_add_flags add_flags);
 442
 443 extern enum language deduce_language_from_filename (const char *);
 444
 445 /* Map the filename extension EXT to the language LANG.  Any previous
 446    association of EXT will be removed.  EXT will be copied by this
 447    function.  */
 448 extern void add_filename_language (const char *ext, enum language lang);
 449
 450 extern struct objfile *symbol_file_add (const char *, symfile_add_flags,
 451                                         struct section_addr_info *, objfile_flags);
 452
 453 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, symfile_add_flags,
 454                                                  struct section_addr_info *,
 455                                                  objfile_flags, struct objfile *parent);
 456
 457 extern void symbol_file_add_separate (bfd *, const char *, symfile_add_flags,
 458                                       struct objfile *);
 459
 460 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 461
 462 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 463
 464 extern struct section_addr_info *alloc_section_addr_info (size_t
 465                                                           num_sections);
 466
 467 /* Build (allocate and populate) a section_addr_info struct from an
 468    existing section table.  */
 469
 470 extern struct section_addr_info
 471   *build_section_addr_info_from_section_table (const struct target_section
 472                                                *start,
 473                                                const struct target_section
 474                                                *end);
 475
 476 /* Free all memory allocated by
 477    build_section_addr_info_from_section_table.  */
 478
 479 extern void free_section_addr_info (struct section_addr_info *);
 480
 481
 482                         /*   Variables   */
 483
 484 /* If non-zero, shared library symbols will be added automatically
 485    when the inferior is created, new libraries are loaded, or when
 486    attaching to the inferior.  This is almost always what users will
 487    want to have happen; but for very large programs, the startup time
 488    will be excessive, and so if this is a problem, the user can clear
 489    this flag and then add the shared library symbols as needed.  Note
 490    that there is a potential for confusion, since if the shared
 491    library symbols are not loaded, commands like "info fun" will *not*
 492    report all the functions that are actually present.  */
 493
 494 extern int auto_solib_add;
 495
 496 /* From symfile.c */
 497
 498 extern void set_initial_language (void);
 499
 500 extern void find_lowest_section (bfd *, asection *, void *);
 501
 502 extern bfd *symfile_bfd_open (const char *);
 503
 504 extern int get_section_index (struct objfile *, char *);
 505
 506 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 507
 508 /* Utility functions for overlay sections: */
 509 extern enum overlay_debugging_state
 510 {
 511   ovly_off,
 512   ovly_on,
 513   ovly_auto
 514 } overlay_debugging;
 515 extern int overlay_cache_invalid;
 516
 517 /* Return the "mapped" overlay section containing the PC.  */
 518 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 519
 520 /* Return any overlay section containing the PC (even in its LMA
 521    region).  */
 522 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 523
 524 /* Return true if the section is an overlay.  */
 525 extern int section_is_overlay (struct obj_section *);
 526
 527 /* Return true if the overlay section is currently "mapped".  */
 528 extern int section_is_mapped (struct obj_section *);
 529
 530 /* Return true if pc belongs to section's VMA.  */
 531 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 532
 533 /* Return true if pc belongs to section's LMA.  */
 534 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 535
 536 /* Map an address from a section's LMA to its VMA.  */
 537 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 538
 539 /* Map an address from a section's VMA to its LMA.  */
 540 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 541
 542 /* Convert an address in an overlay section (force into VMA range).  */
 543 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 544
 545 /* Load symbols from a file.  */
 546 extern void symbol_file_add_main (const char *args,
 547                                   symfile_add_flags add_flags);
 548
 549 /* Clear GDB symbol tables.  */
 550 extern void symbol_file_clear (int from_tty);
 551
 552 /* Default overlay update function.  */
 553 extern void simple_overlay_update (struct obj_section *);
 554
 555 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 556                                                  bfd_byte *);
 557
 558 extern int symfile_map_offsets_to_segments (bfd *,
 559                                             const struct symfile_segment_data *,
 560                                             struct section_offsets *,
 561                                             int, const CORE_ADDR *);
 562 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 563 void free_symfile_segment_data (struct symfile_segment_data *data);
 564
 565 extern struct cleanup *increment_reading_symtab (void);
 566
 567 void expand_symtabs_matching (expand_symtabs_file_matcher_ftype *,
 568                               expand_symtabs_symbol_matcher_ftype *,
 569                               expand_symtabs_exp_notify_ftype *,
 570                               enum search_domain kind, void *data);
 571
 572 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 573                            int need_fullname);
 574
 575 /* From dwarf2read.c */
 576
 577 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 578    section name (usually from the DWARF standard), while the field COMPRESSED
 579    is the name of compressed sections.  If your object file format doesn't
 580    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 581    the debugging section is not supported, the field NORMAL can be NULL too.
 582    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 583    field.  */
 584
 585 struct dwarf2_section_names {
 586   const char *normal;
 587   const char *compressed;
 588 };
 589
 590 /* List of names for dward2 debugging sections.  Also most object file formats
 591    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 592    due to restrictions.
 593    The table for the standard names is defined in dwarf2read.c.  Please
 594    update all instances of dwarf2_debug_sections if you add a field to this
 595    structure.  It is always safe to use { NULL, NULL } in this case.  */
 596
 597 struct dwarf2_debug_sections {
 598   struct dwarf2_section_names info;
 599   struct dwarf2_section_names abbrev;
 600   struct dwarf2_section_names line;
 601   struct dwarf2_section_names loc;
 602   struct dwarf2_section_names macinfo;
 603   struct dwarf2_section_names macro;
 604   struct dwarf2_section_names str;
 605   struct dwarf2_section_names ranges;
 606   struct dwarf2_section_names types;
 607   struct dwarf2_section_names addr;
 608   struct dwarf2_section_names frame;
 609   struct dwarf2_section_names eh_frame;
 610   struct dwarf2_section_names gdb_index;
 611   /* This field has no meaning, but exists solely to catch changes to
 612      this structure which are not reflected in some instance.  */
 613   int sentinel;
 614 };
 615
 616 extern int dwarf2_has_info (struct objfile *,
 617                             const struct dwarf2_debug_sections *);
 618
 619 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 620 enum dwarf2_section_enum {
 621   DWARF2_DEBUG_FRAME,
 622   DWARF2_EH_FRAME
 623 };
 624
 625 extern void dwarf2_get_section_info (struct objfile *,
 626                                      enum dwarf2_section_enum,
 627                                      asection **, const gdb_byte **,
 628                                      bfd_size_type *);
 629
 630 extern int dwarf2_initialize_objfile (struct objfile *);
 631 extern void dwarf2_build_psymtabs (struct objfile *);
 632 extern void dwarf2_build_frame_info (struct objfile *);
 633
 634 void dwarf2_free_objfile (struct objfile *);
 635
 636 /* From mdebugread.c */
 637
 638 extern void mdebug_build_psymtabs (minimal_symbol_reader &,
 639                                    struct objfile *,
 640                                    const struct ecoff_debug_swap *,
 641                                    struct ecoff_debug_info *);
 642
 643 extern void elfmdebug_build_psymtabs (struct objfile *,
 644                                       const struct ecoff_debug_swap *,
 645                                       asection *);
 646
 647 /* From minidebug.c.  */
 648
 649 extern bfd *find_separate_debug_file_in_section (struct objfile *);
 650
 651 #endif /* !defined(SYMFILE_H) */