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_compare_ftype *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      gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 259      gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 260      enum search_domain kind);
 261
 262   /* Return the comp unit from OBJFILE that contains PC and
 263      SECTION.  Return NULL if there is no such compunit.  This
 264      should return the compunit that contains a symbol whose
 265      address exactly matches PC, or, if there is no exact match, the
 266      compunit that contains a symbol whose address is closest to
 267      PC.  */
 268   struct compunit_symtab *(*find_pc_sect_compunit_symtab)
 269     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 270      CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
 271
 272   /* Call a callback for every file defined in OBJFILE whose symtab is
 273      not already read in.  FUN is the callback.  It is passed the file's
 274      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 275      the DATA passed to this function.  */
 276   void (*map_symbol_filenames) (struct objfile *objfile,
 277                                 symbol_filename_ftype *fun, void *data,
 278                                 int need_fullname);
 279 };
 280
 281 /* Structure of functions used for probe support.  If one of these functions
 282    is provided, all must be.  */
 283
 284 struct sym_probe_fns
 285 {
 286   /* If non-NULL, return a reference to vector of probe objects.  */
 287   const std::vector<probe *> &(*sym_get_probes) (struct objfile *);
 288 };
 289
 290 /* Structure to keep track of symbol reading functions for various
 291    object file types.  */
 292
 293 struct sym_fns
 294 {
 295   /* Initializes anything that is global to the entire symbol table.
 296      It is called during symbol_file_add, when we begin debugging an
 297      entirely new program.  */
 298
 299   void (*sym_new_init) (struct objfile *);
 300
 301   /* Reads any initial information from a symbol file, and initializes
 302      the struct sym_fns SF in preparation for sym_read().  It is
 303      called every time we read a symbol file for any reason.  */
 304
 305   void (*sym_init) (struct objfile *);
 306
 307   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 308      (or possibly a symtab).  OBJFILE is the objfile struct for the
 309      file we are reading.  SYMFILE_FLAGS are the flags passed to
 310      symbol_file_add & co.  */
 311
 312   void (*sym_read) (struct objfile *, symfile_add_flags);
 313
 314   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 315      gdb has to check other ways if this objfile has any symbols.  This may
 316      only be non-NULL if the objfile actually does have debuginfo available.
 317      */
 318
 319   void (*sym_read_psymbols) (struct objfile *);
 320
 321   /* Called when we are finished with an objfile.  Should do all
 322      cleanup that is specific to the object file format for the
 323      particular objfile.  */
 324
 325   void (*sym_finish) (struct objfile *);
 326
 327
 328   /* This function produces a file-dependent section_offsets
 329      structure, allocated in the objfile's storage.
 330
 331      The section_addr_info structure contains the offset of loadable and
 332      allocated sections, relative to the absolute offsets found in the BFD.  */
 333
 334   void (*sym_offsets) (struct objfile *, const struct section_addr_info *);
 335
 336   /* This function produces a format-independent description of
 337      the segments of ABFD.  Each segment is a unit of the file
 338      which may be relocated independently.  */
 339
 340   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 341
 342   /* This function should read the linetable from the objfile when
 343      the line table cannot be read while processing the debugging
 344      information.  */
 345
 346   void (*sym_read_linetable) (struct objfile *);
 347
 348   /* Relocate the contents of a debug section SECTP.  The
 349      contents are stored in BUF if it is non-NULL, or returned in a
 350      malloc'd buffer otherwise.  */
 351
 352   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 353
 354   /* If non-NULL, this objfile has probe support, and all the probe
 355      functions referred to here will be non-NULL.  */
 356   const struct sym_probe_fns *sym_probe_fns;
 357
 358   /* The "quick" (aka partial) symbol functions for this symbol
 359      reader.  */
 360   const struct quick_symbol_functions *qf;
 361 };
 362
 363 extern struct section_addr_info *
 364   build_section_addr_info_from_objfile (const struct objfile *objfile);
 365
 366 extern void relative_addr_info_to_section_offsets
 367   (struct section_offsets *section_offsets, int num_sections,
 368    const struct section_addr_info *addrs);
 369
 370 extern void addr_info_make_relative (struct section_addr_info *addrs,
 371                                      bfd *abfd);
 372
 373 /* The default version of sym_fns.sym_offsets for readers that don't
 374    do anything special.  */
 375
 376 extern void default_symfile_offsets (struct objfile *objfile,
 377                                      const struct section_addr_info *);
 378
 379 /* The default version of sym_fns.sym_segments for readers that don't
 380    do anything special.  */
 381
 382 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 383
 384 /* The default version of sym_fns.sym_relocate for readers that don't
 385    do anything special.  */
 386
 387 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 388                                            asection *sectp, bfd_byte *buf);
 389
 390 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 391   ATTRIBUTE_NONNULL (1);
 392
 393 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 394                                                          const char *)
 395   ATTRIBUTE_NONNULL (1);
 396
 397 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 398
 399 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 400
 401 extern void clear_symtab_users (symfile_add_flags add_flags);
 402
 403 extern enum language deduce_language_from_filename (const char *);
 404
 405 /* Map the filename extension EXT to the language LANG.  Any previous
 406    association of EXT will be removed.  EXT will be copied by this
 407    function.  */
 408 extern void add_filename_language (const char *ext, enum language lang);
 409
 410 extern struct objfile *symbol_file_add (const char *, symfile_add_flags,
 411                                         struct section_addr_info *, objfile_flags);
 412
 413 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, symfile_add_flags,
 414                                                  struct section_addr_info *,
 415                                                  objfile_flags, struct objfile *parent);
 416
 417 extern void symbol_file_add_separate (bfd *, const char *, symfile_add_flags,
 418                                       struct objfile *);
 419
 420 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 421
 422 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 423
 424 extern struct section_addr_info *alloc_section_addr_info (size_t
 425                                                           num_sections);
 426
 427 /* Build (allocate and populate) a section_addr_info struct from an
 428    existing section table.  */
 429
 430 extern struct section_addr_info
 431   *build_section_addr_info_from_section_table (const struct target_section
 432                                                *start,
 433                                                const struct target_section
 434                                                *end);
 435
 436 /* Free all memory allocated by
 437    build_section_addr_info_from_section_table.  */
 438
 439 extern void free_section_addr_info (struct section_addr_info *);
 440
 441
 442                         /*   Variables   */
 443
 444 /* If non-zero, shared library symbols will be added automatically
 445    when the inferior is created, new libraries are loaded, or when
 446    attaching to the inferior.  This is almost always what users will
 447    want to have happen; but for very large programs, the startup time
 448    will be excessive, and so if this is a problem, the user can clear
 449    this flag and then add the shared library symbols as needed.  Note
 450    that there is a potential for confusion, since if the shared
 451    library symbols are not loaded, commands like "info fun" will *not*
 452    report all the functions that are actually present.  */
 453
 454 extern int auto_solib_add;
 455
 456 /* From symfile.c */
 457
 458 extern void set_initial_language (void);
 459
 460 extern void find_lowest_section (bfd *, asection *, void *);
 461
 462 extern gdb_bfd_ref_ptr symfile_bfd_open (const char *);
 463
 464 extern int get_section_index (struct objfile *, const char *);
 465
 466 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 467
 468 /* Utility functions for overlay sections: */
 469 extern enum overlay_debugging_state
 470 {
 471   ovly_off,
 472   ovly_on,
 473   ovly_auto
 474 } overlay_debugging;
 475 extern int overlay_cache_invalid;
 476
 477 /* Return the "mapped" overlay section containing the PC.  */
 478 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 479
 480 /* Return any overlay section containing the PC (even in its LMA
 481    region).  */
 482 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 483
 484 /* Return true if the section is an overlay.  */
 485 extern int section_is_overlay (struct obj_section *);
 486
 487 /* Return true if the overlay section is currently "mapped".  */
 488 extern int section_is_mapped (struct obj_section *);
 489
 490 /* Return true if pc belongs to section's VMA.  */
 491 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 492
 493 /* Return true if pc belongs to section's LMA.  */
 494 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 495
 496 /* Map an address from a section's LMA to its VMA.  */
 497 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 498
 499 /* Map an address from a section's VMA to its LMA.  */
 500 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 501
 502 /* Convert an address in an overlay section (force into VMA range).  */
 503 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 504
 505 /* Load symbols from a file.  */
 506 extern void symbol_file_add_main (const char *args,
 507                                   symfile_add_flags add_flags);
 508
 509 /* Clear GDB symbol tables.  */
 510 extern void symbol_file_clear (int from_tty);
 511
 512 /* Default overlay update function.  */
 513 extern void simple_overlay_update (struct obj_section *);
 514
 515 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 516                                                  bfd_byte *);
 517
 518 extern int symfile_map_offsets_to_segments (bfd *,
 519                                             const struct symfile_segment_data *,
 520                                             struct section_offsets *,
 521                                             int, const CORE_ADDR *);
 522 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 523 void free_symfile_segment_data (struct symfile_segment_data *data);
 524
 525 extern scoped_restore_tmpl<int> increment_reading_symtab (void);
 526
 527 void expand_symtabs_matching
 528   (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 529    gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 530    gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 531    enum search_domain kind);
 532
 533 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 534                            int need_fullname);
 535
 536 /* From dwarf2read.c */
 537
 538 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 539    section name (usually from the DWARF standard), while the field COMPRESSED
 540    is the name of compressed sections.  If your object file format doesn't
 541    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 542    the debugging section is not supported, the field NORMAL can be NULL too.
 543    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 544    field.  */
 545
 546 struct dwarf2_section_names {
 547   const char *normal;
 548   const char *compressed;
 549 };
 550
 551 /* List of names for dward2 debugging sections.  Also most object file formats
 552    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 553    due to restrictions.
 554    The table for the standard names is defined in dwarf2read.c.  Please
 555    update all instances of dwarf2_debug_sections if you add a field to this
 556    structure.  It is always safe to use { NULL, NULL } in this case.  */
 557
 558 struct dwarf2_debug_sections {
 559   struct dwarf2_section_names info;
 560   struct dwarf2_section_names abbrev;
 561   struct dwarf2_section_names line;
 562   struct dwarf2_section_names loc;
 563   struct dwarf2_section_names loclists;
 564   struct dwarf2_section_names macinfo;
 565   struct dwarf2_section_names macro;
 566   struct dwarf2_section_names str;
 567   struct dwarf2_section_names line_str;
 568   struct dwarf2_section_names ranges;
 569   struct dwarf2_section_names rnglists;
 570   struct dwarf2_section_names types;
 571   struct dwarf2_section_names addr;
 572   struct dwarf2_section_names frame;
 573   struct dwarf2_section_names eh_frame;
 574   struct dwarf2_section_names gdb_index;
 575   /* This field has no meaning, but exists solely to catch changes to
 576      this structure which are not reflected in some instance.  */
 577   int sentinel;
 578 };
 579
 580 extern int dwarf2_has_info (struct objfile *,
 581                             const struct dwarf2_debug_sections *);
 582
 583 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 584 enum dwarf2_section_enum {
 585   DWARF2_DEBUG_FRAME,
 586   DWARF2_EH_FRAME
 587 };
 588
 589 extern void dwarf2_get_section_info (struct objfile *,
 590                                      enum dwarf2_section_enum,
 591                                      asection **, const gdb_byte **,
 592                                      bfd_size_type *);
 593
 594 extern int dwarf2_initialize_objfile (struct objfile *);
 595 extern void dwarf2_build_psymtabs (struct objfile *);
 596 extern void dwarf2_build_frame_info (struct objfile *);
 597
 598 void dwarf2_free_objfile (struct objfile *);
 599
 600 /* From mdebugread.c */
 601
 602 extern void mdebug_build_psymtabs (minimal_symbol_reader &,
 603                                    struct objfile *,
 604                                    const struct ecoff_debug_swap *,
 605                                    struct ecoff_debug_info *);
 606
 607 extern void elfmdebug_build_psymtabs (struct objfile *,
 608                                       const struct ecoff_debug_swap *,
 609                                       asection *);
 610
 611 /* From minidebug.c.  */
 612
 613 extern gdb_bfd_ref_ptr find_separate_debug_file_in_section (struct objfile *);
 614
 615 /* True if we are printing debug output about separate debug info files.  */
 616
 617 extern int separate_debug_file_debug;
 618
 619 #endif /* !defined(SYMFILE_H) */