gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2019 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, 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) (const struct block *,
 232                                                  struct symbol *, void *),
 233                                 void *data,
 234                                 symbol_name_match_type 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      const lookup_name_info &lookup_name,
 259      gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 260      gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 261      enum search_domain kind);
 262
 263   /* Return the comp unit from OBJFILE that contains PC and
 264      SECTION.  Return NULL if there is no such compunit.  This
 265      should return the compunit that contains a symbol whose
 266      address exactly matches PC, or, if there is no exact match, the
 267      compunit that contains a symbol whose address is closest to
 268      PC.  */
 269   struct compunit_symtab *(*find_pc_sect_compunit_symtab)
 270     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 271      CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
 272
 273   /* Return the comp unit from OBJFILE that contains a symbol at
 274      ADDRESS.  Return NULL if there is no such comp unit.  Unlike
 275      find_pc_sect_compunit_symtab, any sort of symbol (not just text
 276      symbols) can be considered, and only exact address matches are
 277      considered.  This pointer may be NULL.  */
 278   struct compunit_symtab *(*find_compunit_symtab_by_address)
 279     (struct objfile *objfile, CORE_ADDR address);
 280
 281   /* Call a callback for every file defined in OBJFILE whose symtab is
 282      not already read in.  FUN is the callback.  It is passed the file's
 283      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 284      the DATA passed to this function.  */
 285   void (*map_symbol_filenames) (struct objfile *objfile,
 286                                 symbol_filename_ftype *fun, void *data,
 287                                 int need_fullname);
 288 };
 289
 290 /* Structure of functions used for probe support.  If one of these functions
 291    is provided, all must be.  */
 292
 293 struct sym_probe_fns
 294 {
 295   /* If non-NULL, return a reference to vector of probe objects.  */
 296   const std::vector<std::unique_ptr<probe>> &(*sym_get_probes)
 297     (struct objfile *);
 298 };
 299
 300 /* Structure to keep track of symbol reading functions for various
 301    object file types.  */
 302
 303 struct sym_fns
 304 {
 305   /* Initializes anything that is global to the entire symbol table.
 306      It is called during symbol_file_add, when we begin debugging an
 307      entirely new program.  */
 308
 309   void (*sym_new_init) (struct objfile *);
 310
 311   /* Reads any initial information from a symbol file, and initializes
 312      the struct sym_fns SF in preparation for sym_read().  It is
 313      called every time we read a symbol file for any reason.  */
 314
 315   void (*sym_init) (struct objfile *);
 316
 317   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 318      (or possibly a symtab).  OBJFILE is the objfile struct for the
 319      file we are reading.  SYMFILE_FLAGS are the flags passed to
 320      symbol_file_add & co.  */
 321
 322   void (*sym_read) (struct objfile *, symfile_add_flags);
 323
 324   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 325      gdb has to check other ways if this objfile has any symbols.  This may
 326      only be non-NULL if the objfile actually does have debuginfo available.
 327      */
 328
 329   void (*sym_read_psymbols) (struct objfile *);
 330
 331   /* Called when we are finished with an objfile.  Should do all
 332      cleanup that is specific to the object file format for the
 333      particular objfile.  */
 334
 335   void (*sym_finish) (struct objfile *);
 336
 337
 338   /* This function produces a file-dependent section_offsets
 339      structure, allocated in the objfile's storage.
 340
 341      The section_addr_info structure contains the offset of loadable and
 342      allocated sections, relative to the absolute offsets found in the BFD.  */
 343
 344   void (*sym_offsets) (struct objfile *, const section_addr_info &);
 345
 346   /* This function produces a format-independent description of
 347      the segments of ABFD.  Each segment is a unit of the file
 348      which may be relocated independently.  */
 349
 350   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 351
 352   /* This function should read the linetable from the objfile when
 353      the line table cannot be read while processing the debugging
 354      information.  */
 355
 356   void (*sym_read_linetable) (struct objfile *);
 357
 358   /* Relocate the contents of a debug section SECTP.  The
 359      contents are stored in BUF if it is non-NULL, or returned in a
 360      malloc'd buffer otherwise.  */
 361
 362   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 363
 364   /* If non-NULL, this objfile has probe support, and all the probe
 365      functions referred to here will be non-NULL.  */
 366   const struct sym_probe_fns *sym_probe_fns;
 367
 368   /* The "quick" (aka partial) symbol functions for this symbol
 369      reader.  */
 370   const struct quick_symbol_functions *qf;
 371 };
 372
 373 extern section_addr_info
 374   build_section_addr_info_from_objfile (const struct objfile *objfile);
 375
 376 extern void relative_addr_info_to_section_offsets
 377   (struct section_offsets *section_offsets, int num_sections,
 378    const section_addr_info &addrs);
 379
 380 extern void addr_info_make_relative (section_addr_info *addrs,
 381                                      bfd *abfd);
 382
 383 /* The default version of sym_fns.sym_offsets for readers that don't
 384    do anything special.  */
 385
 386 extern void default_symfile_offsets (struct objfile *objfile,
 387                                      const section_addr_info &);
 388
 389 /* The default version of sym_fns.sym_segments for readers that don't
 390    do anything special.  */
 391
 392 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 393
 394 /* The default version of sym_fns.sym_relocate for readers that don't
 395    do anything special.  */
 396
 397 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 398                                            asection *sectp, bfd_byte *buf);
 399
 400 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 401   ATTRIBUTE_NONNULL (1);
 402
 403 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 404                                                          const char *)
 405   ATTRIBUTE_NONNULL (1);
 406
 407 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 408
 409 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 410
 411 extern void clear_symtab_users (symfile_add_flags add_flags);
 412
 413 extern enum language deduce_language_from_filename (const char *);
 414
 415 /* Map the filename extension EXT to the language LANG.  Any previous
 416    association of EXT will be removed.  EXT will be copied by this
 417    function.  */
 418 extern void add_filename_language (const char *ext, enum language lang);
 419
 420 extern struct objfile *symbol_file_add (const char *, symfile_add_flags,
 421                                         section_addr_info *, objfile_flags);
 422
 423 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, symfile_add_flags,
 424                                                  section_addr_info *,
 425                                                  objfile_flags, struct objfile *parent);
 426
 427 extern void symbol_file_add_separate (bfd *, const char *, symfile_add_flags,
 428                                       struct objfile *);
 429
 430 extern std::string find_separate_debug_file_by_debuglink (struct objfile *);
 431
 432 /* Build (allocate and populate) a section_addr_info struct from an
 433    existing section table.  */
 434
 435 extern section_addr_info
 436    build_section_addr_info_from_section_table (const struct target_section
 437                                                *start,
 438                                                const struct target_section
 439                                                *end);
 440
 441                         /*   Variables   */
 442
 443 /* If non-zero, shared library symbols will be added automatically
 444    when the inferior is created, new libraries are loaded, or when
 445    attaching to the inferior.  This is almost always what users will
 446    want to have happen; but for very large programs, the startup time
 447    will be excessive, and so if this is a problem, the user can clear
 448    this flag and then add the shared library symbols as needed.  Note
 449    that there is a potential for confusion, since if the shared
 450    library symbols are not loaded, commands like "info fun" will *not*
 451    report all the functions that are actually present.  */
 452
 453 extern int auto_solib_add;
 454
 455 /* From symfile.c */
 456
 457 extern void set_initial_language (void);
 458
 459 extern void find_lowest_section (bfd *, asection *, void *);
 460
 461 extern gdb_bfd_ref_ptr symfile_bfd_open (const char *);
 462
 463 extern int get_section_index (struct objfile *, const char *);
 464
 465 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 466
 467 /* Utility functions for overlay sections: */
 468 extern enum overlay_debugging_state
 469 {
 470   ovly_off,
 471   ovly_on,
 472   ovly_auto
 473 } overlay_debugging;
 474 extern int overlay_cache_invalid;
 475
 476 /* Return the "mapped" overlay section containing the PC.  */
 477 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 478
 479 /* Return any overlay section containing the PC (even in its LMA
 480    region).  */
 481 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 482
 483 /* Return true if the section is an overlay.  */
 484 extern int section_is_overlay (struct obj_section *);
 485
 486 /* Return true if the overlay section is currently "mapped".  */
 487 extern int section_is_mapped (struct obj_section *);
 488
 489 /* Return true if pc belongs to section's VMA.  */
 490 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 491
 492 /* Return true if pc belongs to section's LMA.  */
 493 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 494
 495 /* Map an address from a section's LMA to its VMA.  */
 496 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 497
 498 /* Map an address from a section's VMA to its LMA.  */
 499 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 500
 501 /* Convert an address in an overlay section (force into VMA range).  */
 502 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 503
 504 /* Load symbols from a file.  */
 505 extern void symbol_file_add_main (const char *args,
 506                                   symfile_add_flags add_flags);
 507
 508 /* Clear GDB symbol tables.  */
 509 extern void symbol_file_clear (int from_tty);
 510
 511 /* Default overlay update function.  */
 512 extern void simple_overlay_update (struct obj_section *);
 513
 514 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 515                                                  bfd_byte *);
 516
 517 extern int symfile_map_offsets_to_segments (bfd *,
 518                                             const struct symfile_segment_data *,
 519                                             struct section_offsets *,
 520                                             int, const CORE_ADDR *);
 521 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 522 void free_symfile_segment_data (struct symfile_segment_data *data);
 523
 524 extern scoped_restore_tmpl<int> increment_reading_symtab (void);
 525
 526 void expand_symtabs_matching
 527   (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 528    const lookup_name_info &lookup_name,
 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 /* Target-agnostic function to load the sections of an executable into memory.
 537
 538    ARGS should be in the form "EXECUTABLE [OFFSET]", where OFFSET is an
 539    optional offset to apply to each section.  */
 540 extern void generic_load (const char *args, int from_tty);
 541
 542 /* From dwarf2read.c */
 543
 544 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 545    section name (usually from the DWARF standard), while the field COMPRESSED
 546    is the name of compressed sections.  If your object file format doesn't
 547    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 548    the debugging section is not supported, the field NORMAL can be NULL too.
 549    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 550    field.  */
 551
 552 struct dwarf2_section_names {
 553   const char *normal;
 554   const char *compressed;
 555 };
 556
 557 /* List of names for dward2 debugging sections.  Also most object file formats
 558    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 559    due to restrictions.
 560    The table for the standard names is defined in dwarf2read.c.  Please
 561    update all instances of dwarf2_debug_sections if you add a field to this
 562    structure.  It is always safe to use { NULL, NULL } in this case.  */
 563
 564 struct dwarf2_debug_sections {
 565   struct dwarf2_section_names info;
 566   struct dwarf2_section_names abbrev;
 567   struct dwarf2_section_names line;
 568   struct dwarf2_section_names loc;
 569   struct dwarf2_section_names loclists;
 570   struct dwarf2_section_names macinfo;
 571   struct dwarf2_section_names macro;
 572   struct dwarf2_section_names str;
 573   struct dwarf2_section_names line_str;
 574   struct dwarf2_section_names ranges;
 575   struct dwarf2_section_names rnglists;
 576   struct dwarf2_section_names types;
 577   struct dwarf2_section_names addr;
 578   struct dwarf2_section_names frame;
 579   struct dwarf2_section_names eh_frame;
 580   struct dwarf2_section_names gdb_index;
 581   struct dwarf2_section_names debug_names;
 582   struct dwarf2_section_names debug_aranges;
 583   /* This field has no meaning, but exists solely to catch changes to
 584      this structure which are not reflected in some instance.  */
 585   int sentinel;
 586 };
 587
 588 extern int dwarf2_has_info (struct objfile *,
 589                             const struct dwarf2_debug_sections *);
 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 int separate_debug_file_debug;
 630
 631 #endif /* !defined(SYMFILE_H) */