gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2018 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 value;
  38 struct frame_info;
  39 struct agent_expr;
  40 struct axs_value;
  41 class probe;
  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   other_sections (CORE_ADDR addr_, std::string &&name_, int sectindex_)
  51     : addr (addr_),
  52       name (std::move (name_)),
  53       sectindex (sectindex_)
  54   {
  55   }
  56
  57   other_sections (other_sections &&other) = default;
  58
  59   DISABLE_COPY_AND_ASSIGN (other_sections);
  60
  61   CORE_ADDR addr;
  62   std::string name;
  63
  64   /* SECTINDEX must be valid for associated BFD or set to -1.
  65      See syms_from_objfile_1 for an exception to this rule.
  66    */
  67   int sectindex;
  68 };
  69
  70 /* Define an array of addresses to accommodate non-contiguous dynamic
  71    loading of modules.  This is for use when entering commands, so we
  72    can keep track of the section names until we read the file and can
  73    map them to bfd sections.  This structure is also used by solib.c
  74    to communicate the section addresses in shared objects to
  75    symbol_file_add ().  */
  76
  77 typedef std::vector<other_sections> section_addr_info;
  78
  79 /* A table listing the load segments in a symfile, and which segment
  80    each BFD section belongs to.  */
  81 struct symfile_segment_data
  82 {
  83   /* How many segments are present in this file.  If there are
  84      two, the text segment is the first one and the data segment
  85      is the second one.  */
  86   int num_segments;
  87
  88   /* If NUM_SEGMENTS is greater than zero, the original base address
  89      of each segment.  */
  90   CORE_ADDR *segment_bases;
  91
  92   /* If NUM_SEGMENTS is greater than zero, the memory size of each
  93      segment.  */
  94   CORE_ADDR *segment_sizes;
  95
  96   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
  97      recording which segment contains each BFD section.
  98      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
  99      S, or zero if it is not in any segment.  */
 100   int *segment_info;
 101 };
 102
 103 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
 104
 105 typedef void (symbol_filename_ftype) (const char *filename,
 106                                       const char *fullname, void *data);
 107
 108 /* Callback for quick_symbol_functions->expand_symtabs_matching
 109    to match a file name.  */
 110
 111 typedef bool (expand_symtabs_file_matcher_ftype) (const char *filename,
 112                                                   bool basenames);
 113
 114 /* Callback for quick_symbol_functions->expand_symtabs_matching
 115    to match a symbol name.  */
 116
 117 typedef bool (expand_symtabs_symbol_matcher_ftype) (const char *name);
 118
 119 /* Callback for quick_symbol_functions->expand_symtabs_matching
 120    to be called after a symtab has been expanded.  */
 121
 122 typedef void (expand_symtabs_exp_notify_ftype) (compunit_symtab *symtab);
 123
 124 /* The "quick" symbol functions exist so that symbol readers can
 125    avoiding an initial read of all the symbols.  For example, symbol
 126    readers might choose to use the "partial symbol table" utilities,
 127    which is one implementation of the quick symbol functions.
 128
 129    The quick symbol functions are generally opaque: the underlying
 130    representation is hidden from the caller.
 131
 132    In general, these functions should only look at whatever special
 133    index the symbol reader creates -- looking through the symbol
 134    tables themselves is handled by generic code.  If a function is
 135    defined as returning a "symbol table", this means that the function
 136    should only return a newly-created symbol table; it should not
 137    examine pre-existing ones.
 138
 139    The exact list of functions here was determined in an ad hoc way
 140    based on gdb's history.  */
 141
 142 struct quick_symbol_functions
 143 {
 144   /* Return true if this objfile has any "partial" symbols
 145      available.  */
 146   int (*has_symbols) (struct objfile *objfile);
 147
 148   /* Return the symbol table for the "last" file appearing in
 149      OBJFILE.  */
 150   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 151
 152   /* Forget all cached full file names for OBJFILE.  */
 153   void (*forget_cached_source_info) (struct objfile *objfile);
 154
 155   /* Expand and iterate over each "partial" symbol table in OBJFILE
 156      where the source file is named NAME.
 157
 158      If NAME is not absolute, a match after a '/' in the symbol table's
 159      file name will also work, REAL_PATH is NULL then.  If NAME is
 160      absolute then REAL_PATH is non-NULL absolute file name as resolved
 161      via gdb_realpath from NAME.
 162
 163      If a match is found, the "partial" symbol table is expanded.
 164      Then, this calls iterate_over_some_symtabs (or equivalent) over
 165      all newly-created symbol tables, passing CALLBACK to it.
 166      The result of this call is returned.  */
 167   bool (*map_symtabs_matching_filename)
 168     (struct objfile *objfile, const char *name, const char *real_path,
 169      gdb::function_view<bool (symtab *)> callback);
 170
 171   /* Check to see if the symbol is defined in a "partial" symbol table
 172      of OBJFILE.  BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
 173      depending on whether we want to search global symbols or static
 174      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 175      indicates what sort of symbol to search for.
 176
 177      Returns the newly-expanded compunit in which the symbol is
 178      defined, or NULL if no such symbol table exists.  If OBJFILE
 179      contains !TYPE_OPAQUE symbol prefer its compunit.  If it contains
 180      only TYPE_OPAQUE symbol(s), return at least that compunit.  */
 181   struct compunit_symtab *(*lookup_symbol) (struct objfile *objfile,
 182                                             int block_index, const char *name,
 183                                             domain_enum domain);
 184
 185   /* Print statistics about any indices loaded for OBJFILE.  The
 186      statistics should be printed to gdb_stdout.  This is used for
 187      "maint print statistics".  */
 188   void (*print_stats) (struct objfile *objfile);
 189
 190   /* Dump any indices loaded for OBJFILE.  The dump should go to
 191      gdb_stdout.  This is used for "maint print objfiles".  */
 192   void (*dump) (struct objfile *objfile);
 193
 194   /* This is called by objfile_relocate to relocate any indices loaded
 195      for OBJFILE.  */
 196   void (*relocate) (struct objfile *objfile,
 197                     const struct section_offsets *new_offsets,
 198                     const struct section_offsets *delta);
 199
 200   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 201      the corresponding symbol tables are loaded.  */
 202   void (*expand_symtabs_for_function) (struct objfile *objfile,
 203                                        const char *func_name);
 204
 205   /* Read all symbol tables associated with OBJFILE.  */
 206   void (*expand_all_symtabs) (struct objfile *objfile);
 207
 208   /* Read all symbol tables associated with OBJFILE which have
 209      symtab_to_fullname equal to FULLNAME.
 210      This is for the purposes of examining code only, e.g., expand_line_sal.
 211      The routine may ignore debug info that is known to not be useful with
 212      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 213   void (*expand_symtabs_with_fullname) (struct objfile *objfile,
 214                                         const char *fullname);
 215
 216   /* Find global or static symbols in all tables that are in DOMAIN
 217      and for which MATCH (symbol name, NAME) == 0, passing each to
 218      CALLBACK, reading in partial symbol tables as needed.  Look
 219      through global symbols if GLOBAL and otherwise static symbols.
 220      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 221      found.  After each block is processed, passes NULL to CALLBACK.
 222      MATCH must be weaker than strcmp_iw_ordered in the sense that
 223      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 224      if non-null, must be an ordering relation compatible with
 225      strcmp_iw_ordered in the sense that
 226             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 227      and
 228             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 229      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 230      CALLBACK returns 0 to indicate that the scan should continue, or
 231      non-zero to indicate that the scan should be terminated.  */
 232
 233   void (*map_matching_symbols) (struct objfile *,
 234                                 const char *name, domain_enum domain,
 235                                 int global,
 236                                 int (*callback) (struct block *,
 237                                                  struct symbol *, void *),
 238                                 void *data,
 239                                 symbol_name_match_type match,
 240                                 symbol_compare_ftype *ordered_compare);
 241
 242   /* Expand all symbol tables in OBJFILE matching some criteria.
 243
 244      FILE_MATCHER is called for each file in OBJFILE.  The file name
 245      is passed to it.  If the matcher returns false, the file is
 246      skipped.  If FILE_MATCHER is NULL the file is not skipped.  If
 247      BASENAMES is true the matcher should consider only file base
 248      names (the passed file name is already only the lbasename'd
 249      part).
 250
 251      Otherwise, if KIND does not match, this symbol is skipped.
 252
 253      If even KIND matches, SYMBOL_MATCHER is called for each symbol
 254      defined in the file.  The symbol "search" name is passed to
 255      SYMBOL_MATCHER.
 256
 257      If SYMBOL_MATCHER returns false, then the symbol is skipped.
 258
 259      Otherwise, the symbol's symbol table is expanded.  */
 260   void (*expand_symtabs_matching)
 261     (struct objfile *objfile,
 262      gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 263      const lookup_name_info &lookup_name,
 264      gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 265      gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 266      enum search_domain kind);
 267
 268   /* Return the comp unit from OBJFILE that contains PC and
 269      SECTION.  Return NULL if there is no such compunit.  This
 270      should return the compunit that contains a symbol whose
 271      address exactly matches PC, or, if there is no exact match, the
 272      compunit that contains a symbol whose address is closest to
 273      PC.  */
 274   struct compunit_symtab *(*find_pc_sect_compunit_symtab)
 275     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 276      CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
 277
 278   /* Return the comp unit from OBJFILE that contains a symbol at
 279      ADDRESS.  Return NULL if there is no such comp unit.  Unlike
 280      find_pc_sect_compunit_symtab, any sort of symbol (not just text
 281      symbols) can be considered, and only exact address matches are
 282      considered.  This pointer may be NULL.  */
 283   struct compunit_symtab *(*find_compunit_symtab_by_address)
 284     (struct objfile *objfile, CORE_ADDR address);
 285
 286   /* Call a callback for every file defined in OBJFILE whose symtab is
 287      not already read in.  FUN is the callback.  It is passed the file's
 288      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 289      the DATA passed to this function.  */
 290   void (*map_symbol_filenames) (struct objfile *objfile,
 291                                 symbol_filename_ftype *fun, void *data,
 292                                 int need_fullname);
 293 };
 294
 295 /* Structure of functions used for probe support.  If one of these functions
 296    is provided, all must be.  */
 297
 298 struct sym_probe_fns
 299 {
 300   /* If non-NULL, return a reference to vector of probe objects.  */
 301   const std::vector<probe *> &(*sym_get_probes) (struct objfile *);
 302 };
 303
 304 /* Structure to keep track of symbol reading functions for various
 305    object file types.  */
 306
 307 struct sym_fns
 308 {
 309   /* Initializes anything that is global to the entire symbol table.
 310      It is called during symbol_file_add, when we begin debugging an
 311      entirely new program.  */
 312
 313   void (*sym_new_init) (struct objfile *);
 314
 315   /* Reads any initial information from a symbol file, and initializes
 316      the struct sym_fns SF in preparation for sym_read().  It is
 317      called every time we read a symbol file for any reason.  */
 318
 319   void (*sym_init) (struct objfile *);
 320
 321   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 322      (or possibly a symtab).  OBJFILE is the objfile struct for the
 323      file we are reading.  SYMFILE_FLAGS are the flags passed to
 324      symbol_file_add & co.  */
 325
 326   void (*sym_read) (struct objfile *, symfile_add_flags);
 327
 328   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 329      gdb has to check other ways if this objfile has any symbols.  This may
 330      only be non-NULL if the objfile actually does have debuginfo available.
 331      */
 332
 333   void (*sym_read_psymbols) (struct objfile *);
 334
 335   /* Called when we are finished with an objfile.  Should do all
 336      cleanup that is specific to the object file format for the
 337      particular objfile.  */
 338
 339   void (*sym_finish) (struct objfile *);
 340
 341
 342   /* This function produces a file-dependent section_offsets
 343      structure, allocated in the objfile's storage.
 344
 345      The section_addr_info structure contains the offset of loadable and
 346      allocated sections, relative to the absolute offsets found in the BFD.  */
 347
 348   void (*sym_offsets) (struct objfile *, const section_addr_info &);
 349
 350   /* This function produces a format-independent description of
 351      the segments of ABFD.  Each segment is a unit of the file
 352      which may be relocated independently.  */
 353
 354   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 355
 356   /* This function should read the linetable from the objfile when
 357      the line table cannot be read while processing the debugging
 358      information.  */
 359
 360   void (*sym_read_linetable) (struct objfile *);
 361
 362   /* Relocate the contents of a debug section SECTP.  The
 363      contents are stored in BUF if it is non-NULL, or returned in a
 364      malloc'd buffer otherwise.  */
 365
 366   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 367
 368   /* If non-NULL, this objfile has probe support, and all the probe
 369      functions referred to here will be non-NULL.  */
 370   const struct sym_probe_fns *sym_probe_fns;
 371
 372   /* The "quick" (aka partial) symbol functions for this symbol
 373      reader.  */
 374   const struct quick_symbol_functions *qf;
 375 };
 376
 377 extern section_addr_info
 378   build_section_addr_info_from_objfile (const struct objfile *objfile);
 379
 380 extern void relative_addr_info_to_section_offsets
 381   (struct section_offsets *section_offsets, int num_sections,
 382    const section_addr_info &addrs);
 383
 384 extern void addr_info_make_relative (section_addr_info *addrs,
 385                                      bfd *abfd);
 386
 387 /* The default version of sym_fns.sym_offsets for readers that don't
 388    do anything special.  */
 389
 390 extern void default_symfile_offsets (struct objfile *objfile,
 391                                      const section_addr_info &);
 392
 393 /* The default version of sym_fns.sym_segments for readers that don't
 394    do anything special.  */
 395
 396 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 397
 398 /* The default version of sym_fns.sym_relocate for readers that don't
 399    do anything special.  */
 400
 401 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 402                                            asection *sectp, bfd_byte *buf);
 403
 404 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 405   ATTRIBUTE_NONNULL (1);
 406
 407 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 408                                                          const char *)
 409   ATTRIBUTE_NONNULL (1);
 410
 411 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 412
 413 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 414
 415 extern void clear_symtab_users (symfile_add_flags add_flags);
 416
 417 extern enum language deduce_language_from_filename (const char *);
 418
 419 /* Map the filename extension EXT to the language LANG.  Any previous
 420    association of EXT will be removed.  EXT will be copied by this
 421    function.  */
 422 extern void add_filename_language (const char *ext, enum language lang);
 423
 424 extern struct objfile *symbol_file_add (const char *, symfile_add_flags,
 425                                         section_addr_info *, objfile_flags);
 426
 427 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, symfile_add_flags,
 428                                                  section_addr_info *,
 429                                                  objfile_flags, struct objfile *parent);
 430
 431 extern void symbol_file_add_separate (bfd *, const char *, symfile_add_flags,
 432                                       struct objfile *);
 433
 434 extern std::string find_separate_debug_file_by_debuglink (struct objfile *);
 435
 436 /* Build (allocate and populate) a section_addr_info struct from an
 437    existing section table.  */
 438
 439 extern 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                         /*   Variables   */
 446
 447 /* If non-zero, shared library symbols will be added automatically
 448    when the inferior is created, new libraries are loaded, or when
 449    attaching to the inferior.  This is almost always what users will
 450    want to have happen; but for very large programs, the startup time
 451    will be excessive, and so if this is a problem, the user can clear
 452    this flag and then add the shared library symbols as needed.  Note
 453    that there is a potential for confusion, since if the shared
 454    library symbols are not loaded, commands like "info fun" will *not*
 455    report all the functions that are actually present.  */
 456
 457 extern int auto_solib_add;
 458
 459 /* From symfile.c */
 460
 461 extern void set_initial_language (void);
 462
 463 extern void find_lowest_section (bfd *, asection *, void *);
 464
 465 extern gdb_bfd_ref_ptr symfile_bfd_open (const char *);
 466
 467 extern int get_section_index (struct objfile *, const char *);
 468
 469 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 470
 471 /* Utility functions for overlay sections: */
 472 extern enum overlay_debugging_state
 473 {
 474   ovly_off,
 475   ovly_on,
 476   ovly_auto
 477 } overlay_debugging;
 478 extern int overlay_cache_invalid;
 479
 480 /* Return the "mapped" overlay section containing the PC.  */
 481 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 482
 483 /* Return any overlay section containing the PC (even in its LMA
 484    region).  */
 485 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 486
 487 /* Return true if the section is an overlay.  */
 488 extern int section_is_overlay (struct obj_section *);
 489
 490 /* Return true if the overlay section is currently "mapped".  */
 491 extern int section_is_mapped (struct obj_section *);
 492
 493 /* Return true if pc belongs to section's VMA.  */
 494 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 495
 496 /* Return true if pc belongs to section's LMA.  */
 497 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 498
 499 /* Map an address from a section's LMA to its VMA.  */
 500 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 501
 502 /* Map an address from a section's VMA to its LMA.  */
 503 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 504
 505 /* Convert an address in an overlay section (force into VMA range).  */
 506 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 507
 508 /* Load symbols from a file.  */
 509 extern void symbol_file_add_main (const char *args,
 510                                   symfile_add_flags add_flags);
 511
 512 /* Clear GDB symbol tables.  */
 513 extern void symbol_file_clear (int from_tty);
 514
 515 /* Default overlay update function.  */
 516 extern void simple_overlay_update (struct obj_section *);
 517
 518 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 519                                                  bfd_byte *);
 520
 521 extern int symfile_map_offsets_to_segments (bfd *,
 522                                             const struct symfile_segment_data *,
 523                                             struct section_offsets *,
 524                                             int, const CORE_ADDR *);
 525 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 526 void free_symfile_segment_data (struct symfile_segment_data *data);
 527
 528 extern scoped_restore_tmpl<int> increment_reading_symtab (void);
 529
 530 void expand_symtabs_matching
 531   (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 532    const lookup_name_info &lookup_name,
 533    gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 534    gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 535    enum search_domain kind);
 536
 537 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 538                            int need_fullname);
 539
 540 /* From dwarf2read.c */
 541
 542 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 543    section name (usually from the DWARF standard), while the field COMPRESSED
 544    is the name of compressed sections.  If your object file format doesn't
 545    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 546    the debugging section is not supported, the field NORMAL can be NULL too.
 547    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 548    field.  */
 549
 550 struct dwarf2_section_names {
 551   const char *normal;
 552   const char *compressed;
 553 };
 554
 555 /* List of names for dward2 debugging sections.  Also most object file formats
 556    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 557    due to restrictions.
 558    The table for the standard names is defined in dwarf2read.c.  Please
 559    update all instances of dwarf2_debug_sections if you add a field to this
 560    structure.  It is always safe to use { NULL, NULL } in this case.  */
 561
 562 struct dwarf2_debug_sections {
 563   struct dwarf2_section_names info;
 564   struct dwarf2_section_names abbrev;
 565   struct dwarf2_section_names line;
 566   struct dwarf2_section_names loc;
 567   struct dwarf2_section_names loclists;
 568   struct dwarf2_section_names macinfo;
 569   struct dwarf2_section_names macro;
 570   struct dwarf2_section_names str;
 571   struct dwarf2_section_names line_str;
 572   struct dwarf2_section_names ranges;
 573   struct dwarf2_section_names rnglists;
 574   struct dwarf2_section_names types;
 575   struct dwarf2_section_names addr;
 576   struct dwarf2_section_names frame;
 577   struct dwarf2_section_names eh_frame;
 578   struct dwarf2_section_names gdb_index;
 579   struct dwarf2_section_names debug_names;
 580   struct dwarf2_section_names debug_aranges;
 581   /* This field has no meaning, but exists solely to catch changes to
 582      this structure which are not reflected in some instance.  */
 583   int sentinel;
 584 };
 585
 586 extern int dwarf2_has_info (struct objfile *,
 587                             const struct dwarf2_debug_sections *);
 588
 589 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 590 enum dwarf2_section_enum {
 591   DWARF2_DEBUG_FRAME,
 592   DWARF2_EH_FRAME
 593 };
 594
 595 extern void dwarf2_get_section_info (struct objfile *,
 596                                      enum dwarf2_section_enum,
 597                                      asection **, const gdb_byte **,
 598                                      bfd_size_type *);
 599
 600 /* A DWARF names index variant.  */
 601 enum class dw_index_kind
 602 {
 603   /* GDB's own .gdb_index format.   */
 604   GDB_INDEX,
 605
 606   /* DWARF5 .debug_names.  */
 607   DEBUG_NAMES,
 608 };
 609
 610 /* Initialize for reading DWARF for OBJFILE.  Return false if this
 611    file will use psymtabs, or true if using an index, in which case
 612    *INDEX_KIND is set to the index variant in use.  */
 613 extern bool dwarf2_initialize_objfile (struct objfile *objfile,
 614                                        dw_index_kind *index_kind);
 615
 616 extern void dwarf2_build_psymtabs (struct objfile *);
 617 extern void dwarf2_build_frame_info (struct objfile *);
 618
 619 /* From mdebugread.c */
 620
 621 extern void mdebug_build_psymtabs (minimal_symbol_reader &,
 622                                    struct objfile *,
 623                                    const struct ecoff_debug_swap *,
 624                                    struct ecoff_debug_info *);
 625
 626 extern void elfmdebug_build_psymtabs (struct objfile *,
 627                                       const struct ecoff_debug_swap *,
 628                                       asection *);
 629
 630 /* From minidebug.c.  */
 631
 632 extern gdb_bfd_ref_ptr find_separate_debug_file_in_section (struct objfile *);
 633
 634 /* True if we are printing debug output about separate debug info files.  */
 635
 636 extern int separate_debug_file_debug;
 637
 638 #endif /* !defined(SYMFILE_H) */