gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2020 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 "gdbsupport/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                                             block_enum block_index,
 183                                             const char *name,
 184                                             domain_enum domain);
 185
 186   /* Print statistics about any indices loaded for OBJFILE.  The
 187      statistics should be printed to gdb_stdout.  This is used for
 188      "maint print statistics".  */
 189   void (*print_stats) (struct objfile *objfile);
 190
 191   /* Dump any indices loaded for OBJFILE.  The dump should go to
 192      gdb_stdout.  This is used for "maint print objfiles".  */
 193   void (*dump) (struct objfile *objfile);
 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 and NAMESPACE 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 true to indicate that the scan should continue, or
 226      false to indicate that the scan should be terminated.  */
 227
 228   void (*map_matching_symbols)
 229     (struct objfile *,
 230      const lookup_name_info &lookup_name,
 231      domain_enum domain,
 232      int global,
 233      gdb::function_view<symbol_found_callback_ftype> callback,
 234      symbol_compare_ftype *ordered_compare);
 235
 236   /* Expand all symbol tables in OBJFILE matching some criteria.
 237
 238      FILE_MATCHER is called for each file in OBJFILE.  The file name
 239      is passed to it.  If the matcher returns false, the file is
 240      skipped.  If FILE_MATCHER is NULL the file is not skipped.  If
 241      BASENAMES is true the matcher should consider only file base
 242      names (the passed file name is already only the lbasename'd
 243      part).
 244
 245      Otherwise, if KIND does not match, this symbol is skipped.
 246
 247      If even KIND matches, SYMBOL_MATCHER is called for each symbol
 248      defined in the file.  The symbol "search" name is passed to
 249      SYMBOL_MATCHER.
 250
 251      If SYMBOL_MATCHER returns false, then the symbol is skipped.
 252
 253      Otherwise, the symbol's symbol table is expanded.  */
 254   void (*expand_symtabs_matching)
 255     (struct objfile *objfile,
 256      gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 257      const lookup_name_info &lookup_name,
 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   /* Return the comp unit from OBJFILE that contains a symbol at
 273      ADDRESS.  Return NULL if there is no such comp unit.  Unlike
 274      find_pc_sect_compunit_symtab, any sort of symbol (not just text
 275      symbols) can be considered, and only exact address matches are
 276      considered.  This pointer may be NULL.  */
 277   struct compunit_symtab *(*find_compunit_symtab_by_address)
 278     (struct objfile *objfile, CORE_ADDR address);
 279
 280   /* Call a callback for every file defined in OBJFILE whose symtab is
 281      not already read in.  FUN is the callback.  It is passed the file's
 282      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 283      the DATA passed to this function.  */
 284   void (*map_symbol_filenames) (struct objfile *objfile,
 285                                 symbol_filename_ftype *fun, void *data,
 286                                 int need_fullname);
 287 };
 288
 289 /* Structure of functions used for probe support.  If one of these functions
 290    is provided, all must be.  */
 291
 292 struct sym_probe_fns
 293 {
 294   /* If non-NULL, return a reference to vector of probe objects.  */
 295   const std::vector<std::unique_ptr<probe>> &(*sym_get_probes)
 296     (struct objfile *);
 297 };
 298
 299 /* Structure to keep track of symbol reading functions for various
 300    object file types.  */
 301
 302 struct sym_fns
 303 {
 304   /* Initializes anything that is global to the entire symbol table.
 305      It is called during symbol_file_add, when we begin debugging an
 306      entirely new program.  */
 307
 308   void (*sym_new_init) (struct objfile *);
 309
 310   /* Reads any initial information from a symbol file, and initializes
 311      the struct sym_fns SF in preparation for sym_read().  It is
 312      called every time we read a symbol file for any reason.  */
 313
 314   void (*sym_init) (struct objfile *);
 315
 316   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 317      (or possibly a symtab).  OBJFILE is the objfile struct for the
 318      file we are reading.  SYMFILE_FLAGS are the flags passed to
 319      symbol_file_add & co.  */
 320
 321   void (*sym_read) (struct objfile *, symfile_add_flags);
 322
 323   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 324      gdb has to check other ways if this objfile has any symbols.  This may
 325      only be non-NULL if the objfile actually does have debuginfo available.
 326      */
 327
 328   void (*sym_read_psymbols) (struct objfile *);
 329
 330   /* Called when we are finished with an objfile.  Should do all
 331      cleanup that is specific to the object file format for the
 332      particular objfile.  */
 333
 334   void (*sym_finish) (struct objfile *);
 335
 336
 337   /* This function produces a file-dependent section_offsets
 338      structure, allocated in the objfile's storage.
 339
 340      The section_addr_info structure contains the offset of loadable and
 341      allocated sections, relative to the absolute offsets found in the BFD.  */
 342
 343   void (*sym_offsets) (struct objfile *, const section_addr_info &);
 344
 345   /* This function produces a format-independent description of
 346      the segments of ABFD.  Each segment is a unit of the file
 347      which may be relocated independently.  */
 348
 349   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 350
 351   /* This function should read the linetable from the objfile when
 352      the line table cannot be read while processing the debugging
 353      information.  */
 354
 355   void (*sym_read_linetable) (struct objfile *);
 356
 357   /* Relocate the contents of a debug section SECTP.  The
 358      contents are stored in BUF if it is non-NULL, or returned in a
 359      malloc'd buffer otherwise.  */
 360
 361   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 362
 363   /* If non-NULL, this objfile has probe support, and all the probe
 364      functions referred to here will be non-NULL.  */
 365   const struct sym_probe_fns *sym_probe_fns;
 366
 367   /* The "quick" (aka partial) symbol functions for this symbol
 368      reader.  */
 369   const struct quick_symbol_functions *qf;
 370 };
 371
 372 extern section_addr_info
 373   build_section_addr_info_from_objfile (const struct objfile *objfile);
 374
 375 extern void relative_addr_info_to_section_offsets
 376   (section_offsets &section_offsets, const section_addr_info &addrs);
 377
 378 extern void addr_info_make_relative (section_addr_info *addrs,
 379                                      bfd *abfd);
 380
 381 /* The default version of sym_fns.sym_offsets for readers that don't
 382    do anything special.  */
 383
 384 extern void default_symfile_offsets (struct objfile *objfile,
 385                                      const section_addr_info &);
 386
 387 /* The default version of sym_fns.sym_segments for readers that don't
 388    do anything special.  */
 389
 390 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 391
 392 /* The default version of sym_fns.sym_relocate for readers that don't
 393    do anything special.  */
 394
 395 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 396                                            asection *sectp, bfd_byte *buf);
 397
 398 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 399   ATTRIBUTE_NONNULL (1);
 400
 401 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 402                                                          const char *)
 403   ATTRIBUTE_NONNULL (1);
 404
 405 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 406
 407 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 408
 409 extern void clear_symtab_users (symfile_add_flags add_flags);
 410
 411 extern enum language deduce_language_from_filename (const char *);
 412
 413 /* Map the filename extension EXT to the language LANG.  Any previous
 414    association of EXT will be removed.  EXT will be copied by this
 415    function.  */
 416 extern void add_filename_language (const char *ext, enum language lang);
 417
 418 extern struct objfile *symbol_file_add (const char *, symfile_add_flags,
 419                                         section_addr_info *, objfile_flags);
 420
 421 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, symfile_add_flags,
 422                                                  section_addr_info *,
 423                                                  objfile_flags, struct objfile *parent);
 424
 425 extern void symbol_file_add_separate (bfd *, const char *, symfile_add_flags,
 426                                       struct objfile *);
 427
 428 extern std::string find_separate_debug_file_by_debuglink (struct objfile *);
 429
 430 /* Build (allocate and populate) a section_addr_info struct from an
 431    existing section table.  */
 432
 433 extern section_addr_info
 434    build_section_addr_info_from_section_table (const struct target_section
 435                                                *start,
 436                                                const struct target_section
 437                                                *end);
 438
 439                         /*   Variables   */
 440
 441 /* If true, shared library symbols will be added automatically
 442    when the inferior is created, new libraries are loaded, or when
 443    attaching to the inferior.  This is almost always what users will
 444    want to have happen; but for very large programs, the startup time
 445    will be excessive, and so if this is a problem, the user can clear
 446    this flag and then add the shared library symbols as needed.  Note
 447    that there is a potential for confusion, since if the shared
 448    library symbols are not loaded, commands like "info fun" will *not*
 449    report all the functions that are actually present.  */
 450
 451 extern bool auto_solib_add;
 452
 453 /* From symfile.c */
 454
 455 extern void set_initial_language (void);
 456
 457 extern void find_lowest_section (bfd *, asection *, void *);
 458
 459 extern gdb_bfd_ref_ptr symfile_bfd_open (const char *);
 460
 461 extern int get_section_index (struct objfile *, const char *);
 462
 463 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 464
 465 /* Utility functions for overlay sections: */
 466 extern enum overlay_debugging_state
 467 {
 468   ovly_off,
 469   ovly_on,
 470   ovly_auto
 471 } overlay_debugging;
 472 extern int overlay_cache_invalid;
 473
 474 /* Return the "mapped" overlay section containing the PC.  */
 475 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 476
 477 /* Return any overlay section containing the PC (even in its LMA
 478    region).  */
 479 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 480
 481 /* Return true if the section is an overlay.  */
 482 extern int section_is_overlay (struct obj_section *);
 483
 484 /* Return true if the overlay section is currently "mapped".  */
 485 extern int section_is_mapped (struct obj_section *);
 486
 487 /* Return true if pc belongs to section's VMA.  */
 488 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 489
 490 /* Return true if pc belongs to section's LMA.  */
 491 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 492
 493 /* Map an address from a section's LMA to its VMA.  */
 494 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 495
 496 /* Map an address from a section's VMA to its LMA.  */
 497 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 498
 499 /* Convert an address in an overlay section (force into VMA range).  */
 500 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 501
 502 /* Load symbols from a file.  */
 503 extern void symbol_file_add_main (const char *args,
 504                                   symfile_add_flags add_flags);
 505
 506 /* Clear GDB symbol tables.  */
 507 extern void symbol_file_clear (int from_tty);
 508
 509 /* Default overlay update function.  */
 510 extern void simple_overlay_update (struct obj_section *);
 511
 512 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 513                                                  bfd_byte *);
 514
 515 extern int symfile_map_offsets_to_segments (bfd *,
 516                                             const struct symfile_segment_data *,
 517                                             section_offsets &,
 518                                             int, const CORE_ADDR *);
 519 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 520 void free_symfile_segment_data (struct symfile_segment_data *data);
 521
 522 extern scoped_restore_tmpl<int> increment_reading_symtab (void);
 523
 524 void expand_symtabs_matching
 525   (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 526    const lookup_name_info &lookup_name,
 527    gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 528    gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 529    enum search_domain kind);
 530
 531 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 532                            int need_fullname);
 533
 534 /* Target-agnostic function to load the sections of an executable into memory.
 535
 536    ARGS should be in the form "EXECUTABLE [OFFSET]", where OFFSET is an
 537    optional offset to apply to each section.  */
 538 extern void generic_load (const char *args, int from_tty);
 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 str_offsets;
 572   struct dwarf2_section_names line_str;
 573   struct dwarf2_section_names ranges;
 574   struct dwarf2_section_names rnglists;
 575   struct dwarf2_section_names types;
 576   struct dwarf2_section_names addr;
 577   struct dwarf2_section_names frame;
 578   struct dwarf2_section_names eh_frame;
 579   struct dwarf2_section_names gdb_index;
 580   struct dwarf2_section_names debug_names;
 581   struct dwarf2_section_names debug_aranges;
 582   /* This field has no meaning, but exists solely to catch changes to
 583      this structure which are not reflected in some instance.  */
 584   int sentinel;
 585 };
 586
 587 extern int dwarf2_has_info (struct objfile *,
 588                             const struct dwarf2_debug_sections *,
 589                             bool = false);
 590
 591 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 592 enum dwarf2_section_enum {
 593   DWARF2_DEBUG_FRAME,
 594   DWARF2_EH_FRAME
 595 };
 596
 597 extern void dwarf2_get_section_info (struct objfile *,
 598                                      enum dwarf2_section_enum,
 599                                      asection **, const gdb_byte **,
 600                                      bfd_size_type *);
 601
 602 /* A DWARF names index variant.  */
 603 enum class dw_index_kind
 604 {
 605   /* GDB's own .gdb_index format.   */
 606   GDB_INDEX,
 607
 608   /* DWARF5 .debug_names.  */
 609   DEBUG_NAMES,
 610 };
 611
 612 /* Initialize for reading DWARF for OBJFILE.  Return false if this
 613    file will use psymtabs, or true if using an index, in which case
 614    *INDEX_KIND is set to the index variant in use.  */
 615 extern bool dwarf2_initialize_objfile (struct objfile *objfile,
 616                                        dw_index_kind *index_kind);
 617
 618 extern void dwarf2_build_psymtabs (struct objfile *);
 619 extern void dwarf2_build_frame_info (struct objfile *);
 620
 621 void dwarf2_free_objfile (struct objfile *);
 622
 623 /* From minidebug.c.  */
 624
 625 extern gdb_bfd_ref_ptr find_separate_debug_file_in_section (struct objfile *);
 626
 627 /* True if we are printing debug output about separate debug info files.  */
 628
 629 extern bool separate_debug_file_debug;
 630
 631 #endif /* !defined(SYMFILE_H) */