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