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   int sectindex;
  66 };
  67
  68 /* Define an array of addresses to accommodate non-contiguous dynamic
  69    loading of modules.  This is for use when entering commands, so we
  70    can keep track of the section names until we read the file and can
  71    map them to bfd sections.  This structure is also used by solib.c
  72    to communicate the section addresses in shared objects to
  73    symbol_file_add ().  */
  74
  75 typedef std::vector<other_sections> section_addr_info;
  76
  77 /* A table listing the load segments in a symfile, and which segment
  78    each BFD section belongs to.  */
  79 struct symfile_segment_data
  80 {
  81   /* How many segments are present in this file.  If there are
  82      two, the text segment is the first one and the data segment
  83      is the second one.  */
  84   int num_segments;
  85
  86   /* If NUM_SEGMENTS is greater than zero, the original base address
  87      of each segment.  */
  88   CORE_ADDR *segment_bases;
  89
  90   /* If NUM_SEGMENTS is greater than zero, the memory size of each
  91      segment.  */
  92   CORE_ADDR *segment_sizes;
  93
  94   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
  95      recording which segment contains each BFD section.
  96      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
  97      S, or zero if it is not in any segment.  */
  98   int *segment_info;
  99 };
 100
 101 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
 102
 103 typedef void (symbol_filename_ftype) (const char *filename,
 104                                       const char *fullname, void *data);
 105
 106 /* Callback for quick_symbol_functions->expand_symtabs_matching
 107    to match a file name.  */
 108
 109 typedef bool (expand_symtabs_file_matcher_ftype) (const char *filename,
 110                                                   bool basenames);
 111
 112 /* Callback for quick_symbol_functions->expand_symtabs_matching
 113    to match a symbol name.  */
 114
 115 typedef bool (expand_symtabs_symbol_matcher_ftype) (const char *name);
 116
 117 /* Callback for quick_symbol_functions->expand_symtabs_matching
 118    to be called after a symtab has been expanded.  */
 119
 120 typedef void (expand_symtabs_exp_notify_ftype) (compunit_symtab *symtab);
 121
 122 /* The "quick" symbol functions exist so that symbol readers can
 123    avoiding an initial read of all the symbols.  For example, symbol
 124    readers might choose to use the "partial symbol table" utilities,
 125    which is one implementation of the quick symbol functions.
 126
 127    The quick symbol functions are generally opaque: the underlying
 128    representation is hidden from the caller.
 129
 130    In general, these functions should only look at whatever special
 131    index the symbol reader creates -- looking through the symbol
 132    tables themselves is handled by generic code.  If a function is
 133    defined as returning a "symbol table", this means that the function
 134    should only return a newly-created symbol table; it should not
 135    examine pre-existing ones.
 136
 137    The exact list of functions here was determined in an ad hoc way
 138    based on gdb's history.  */
 139
 140 struct quick_symbol_functions
 141 {
 142   /* Return true if this objfile has any "partial" symbols
 143      available.  */
 144   int (*has_symbols) (struct objfile *objfile);
 145
 146   /* Return the symbol table for the "last" file appearing in
 147      OBJFILE.  */
 148   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 149
 150   /* Forget all cached full file names for OBJFILE.  */
 151   void (*forget_cached_source_info) (struct objfile *objfile);
 152
 153   /* Expand and iterate over each "partial" symbol table in OBJFILE
 154      where the source file is named NAME.
 155
 156      If NAME is not absolute, a match after a '/' in the symbol table's
 157      file name will also work, REAL_PATH is NULL then.  If NAME is
 158      absolute then REAL_PATH is non-NULL absolute file name as resolved
 159      via gdb_realpath from NAME.
 160
 161      If a match is found, the "partial" symbol table is expanded.
 162      Then, this calls iterate_over_some_symtabs (or equivalent) over
 163      all newly-created symbol tables, passing CALLBACK to it.
 164      The result of this call is returned.  */
 165   bool (*map_symtabs_matching_filename)
 166     (struct objfile *objfile, const char *name, const char *real_path,
 167      gdb::function_view<bool (symtab *)> callback);
 168
 169   /* Check to see if the symbol is defined in a "partial" symbol table
 170      of OBJFILE.  BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
 171      depending on whether we want to search global symbols or static
 172      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 173      indicates what sort of symbol to search for.
 174
 175      Returns the newly-expanded compunit in which the symbol is
 176      defined, or NULL if no such symbol table exists.  If OBJFILE
 177      contains !TYPE_OPAQUE symbol prefer its compunit.  If it contains
 178      only TYPE_OPAQUE symbol(s), return at least that compunit.  */
 179   struct compunit_symtab *(*lookup_symbol) (struct objfile *objfile,
 180                                             int block_index, const char *name,
 181                                             domain_enum domain);
 182
 183   /* Print statistics about any indices loaded for OBJFILE.  The
 184      statistics should be printed to gdb_stdout.  This is used for
 185      "maint print statistics".  */
 186   void (*print_stats) (struct objfile *objfile);
 187
 188   /* Dump any indices loaded for OBJFILE.  The dump should go to
 189      gdb_stdout.  This is used for "maint print objfiles".  */
 190   void (*dump) (struct objfile *objfile);
 191
 192   /* This is called by objfile_relocate to relocate any indices loaded
 193      for OBJFILE.  */
 194   void (*relocate) (struct objfile *objfile,
 195                     const struct section_offsets *new_offsets,
 196                     const struct section_offsets *delta);
 197
 198   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 199      the corresponding symbol tables are loaded.  */
 200   void (*expand_symtabs_for_function) (struct objfile *objfile,
 201                                        const char *func_name);
 202
 203   /* Read all symbol tables associated with OBJFILE.  */
 204   void (*expand_all_symtabs) (struct objfile *objfile);
 205
 206   /* Read all symbol tables associated with OBJFILE which have
 207      symtab_to_fullname equal to FULLNAME.
 208      This is for the purposes of examining code only, e.g., expand_line_sal.
 209      The routine may ignore debug info that is known to not be useful with
 210      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 211   void (*expand_symtabs_with_fullname) (struct objfile *objfile,
 212                                         const char *fullname);
 213
 214   /* Find global or static symbols in all tables that are in DOMAIN
 215      and for which MATCH (symbol name, NAME) == 0, passing each to
 216      CALLBACK, reading in partial symbol tables as needed.  Look
 217      through global symbols if GLOBAL and otherwise static symbols.
 218      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 219      found.  After each block is processed, passes NULL to CALLBACK.
 220      MATCH must be weaker than strcmp_iw_ordered in the sense that
 221      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 222      if non-null, must be an ordering relation compatible with
 223      strcmp_iw_ordered in the sense that
 224             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 225      and
 226             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 227      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 228      CALLBACK returns 0 to indicate that the scan should continue, or
 229      non-zero to indicate that the scan should be terminated.  */
 230
 231   void (*map_matching_symbols) (struct objfile *,
 232                                 const char *name, domain_enum domain,
 233                                 int global,
 234                                 int (*callback) (struct block *,
 235                                                  struct symbol *, void *),
 236                                 void *data,
 237                                 symbol_name_match_type match,
 238                                 symbol_compare_ftype *ordered_compare);
 239
 240   /* Expand all symbol tables in OBJFILE matching some criteria.
 241
 242      FILE_MATCHER is called for each file in OBJFILE.  The file name
 243      is passed to it.  If the matcher returns false, the file is
 244      skipped.  If FILE_MATCHER is NULL the file is not skipped.  If
 245      BASENAMES is true the matcher should consider only file base
 246      names (the passed file name is already only the lbasename'd
 247      part).
 248
 249      Otherwise, if KIND does not match, this symbol is skipped.
 250
 251      If even KIND matches, SYMBOL_MATCHER is called for each symbol
 252      defined in the file.  The symbol "search" name is passed to
 253      SYMBOL_MATCHER.
 254
 255      If SYMBOL_MATCHER returns false, then the symbol is skipped.
 256
 257      Otherwise, the symbol's symbol table is expanded.  */
 258   void (*expand_symtabs_matching)
 259     (struct objfile *objfile,
 260      gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 261      const lookup_name_info &lookup_name,
 262      gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 263      gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 264      enum search_domain kind);
 265
 266   /* Return the comp unit from OBJFILE that contains PC and
 267      SECTION.  Return NULL if there is no such compunit.  This
 268      should return the compunit that contains a symbol whose
 269      address exactly matches PC, or, if there is no exact match, the
 270      compunit that contains a symbol whose address is closest to
 271      PC.  */
 272   struct compunit_symtab *(*find_pc_sect_compunit_symtab)
 273     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 274      CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
 275
 276   /* Return the comp unit from OBJFILE that contains a symbol at
 277      ADDRESS.  Return NULL if there is no such comp unit.  Unlike
 278      find_pc_sect_compunit_symtab, any sort of symbol (not just text
 279      symbols) can be considered, and only exact address matches are
 280      considered.  This pointer may be NULL.  */
 281   struct compunit_symtab *(*find_compunit_symtab_by_address)
 282     (struct objfile *objfile, CORE_ADDR address);
 283
 284   /* Call a callback for every file defined in OBJFILE whose symtab is
 285      not already read in.  FUN is the callback.  It is passed the file's
 286      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 287      the DATA passed to this function.  */
 288   void (*map_symbol_filenames) (struct objfile *objfile,
 289                                 symbol_filename_ftype *fun, void *data,
 290                                 int need_fullname);
 291 };
 292
 293 /* Structure of functions used for probe support.  If one of these functions
 294    is provided, all must be.  */
 295
 296 struct sym_probe_fns
 297 {
 298   /* If non-NULL, return a reference to vector of probe objects.  */
 299   const std::vector<probe *> &(*sym_get_probes) (struct objfile *);
 300 };
 301
 302 /* Structure to keep track of symbol reading functions for various
 303    object file types.  */
 304
 305 struct sym_fns
 306 {
 307   /* Initializes anything that is global to the entire symbol table.
 308      It is called during symbol_file_add, when we begin debugging an
 309      entirely new program.  */
 310
 311   void (*sym_new_init) (struct objfile *);
 312
 313   /* Reads any initial information from a symbol file, and initializes
 314      the struct sym_fns SF in preparation for sym_read().  It is
 315      called every time we read a symbol file for any reason.  */
 316
 317   void (*sym_init) (struct objfile *);
 318
 319   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 320      (or possibly a symtab).  OBJFILE is the objfile struct for the
 321      file we are reading.  SYMFILE_FLAGS are the flags passed to
 322      symbol_file_add & co.  */
 323
 324   void (*sym_read) (struct objfile *, symfile_add_flags);
 325
 326   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 327      gdb has to check other ways if this objfile has any symbols.  This may
 328      only be non-NULL if the objfile actually does have debuginfo available.
 329      */
 330
 331   void (*sym_read_psymbols) (struct objfile *);
 332
 333   /* Called when we are finished with an objfile.  Should do all
 334      cleanup that is specific to the object file format for the
 335      particular objfile.  */
 336
 337   void (*sym_finish) (struct objfile *);
 338
 339
 340   /* This function produces a file-dependent section_offsets
 341      structure, allocated in the objfile's storage.
 342
 343      The section_addr_info structure contains the offset of loadable and
 344      allocated sections, relative to the absolute offsets found in the BFD.  */
 345
 346   void (*sym_offsets) (struct objfile *, const section_addr_info &);
 347
 348   /* This function produces a format-independent description of
 349      the segments of ABFD.  Each segment is a unit of the file
 350      which may be relocated independently.  */
 351
 352   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 353
 354   /* This function should read the linetable from the objfile when
 355      the line table cannot be read while processing the debugging
 356      information.  */
 357
 358   void (*sym_read_linetable) (struct objfile *);
 359
 360   /* Relocate the contents of a debug section SECTP.  The
 361      contents are stored in BUF if it is non-NULL, or returned in a
 362      malloc'd buffer otherwise.  */
 363
 364   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 365
 366   /* If non-NULL, this objfile has probe support, and all the probe
 367      functions referred to here will be non-NULL.  */
 368   const struct sym_probe_fns *sym_probe_fns;
 369
 370   /* The "quick" (aka partial) symbol functions for this symbol
 371      reader.  */
 372   const struct quick_symbol_functions *qf;
 373 };
 374
 375 extern section_addr_info
 376   build_section_addr_info_from_objfile (const struct objfile *objfile);
 377
 378 extern void relative_addr_info_to_section_offsets
 379   (struct section_offsets *section_offsets, int num_sections,
 380    const section_addr_info &addrs);
 381
 382 extern void addr_info_make_relative (section_addr_info *addrs,
 383                                      bfd *abfd);
 384
 385 /* The default version of sym_fns.sym_offsets for readers that don't
 386    do anything special.  */
 387
 388 extern void default_symfile_offsets (struct objfile *objfile,
 389                                      const section_addr_info &);
 390
 391 /* The default version of sym_fns.sym_segments for readers that don't
 392    do anything special.  */
 393
 394 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 395
 396 /* The default version of sym_fns.sym_relocate for readers that don't
 397    do anything special.  */
 398
 399 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 400                                            asection *sectp, bfd_byte *buf);
 401
 402 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 403   ATTRIBUTE_NONNULL (1);
 404
 405 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 406                                                          const char *)
 407   ATTRIBUTE_NONNULL (1);
 408
 409 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 410
 411 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 412
 413 extern void clear_symtab_users (symfile_add_flags add_flags);
 414
 415 extern enum language deduce_language_from_filename (const char *);
 416
 417 /* Map the filename extension EXT to the language LANG.  Any previous
 418    association of EXT will be removed.  EXT will be copied by this
 419    function.  */
 420 extern void add_filename_language (const char *ext, enum language lang);
 421
 422 extern struct objfile *symbol_file_add (const char *, symfile_add_flags,
 423                                         section_addr_info *, objfile_flags);
 424
 425 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, symfile_add_flags,
 426                                                  section_addr_info *,
 427                                                  objfile_flags, struct objfile *parent);
 428
 429 extern void symbol_file_add_separate (bfd *, const char *, symfile_add_flags,
 430                                       struct objfile *);
 431
 432 extern std::string find_separate_debug_file_by_debuglink (struct objfile *);
 433
 434 /* Build (allocate and populate) a section_addr_info struct from an
 435    existing section table.  */
 436
 437 extern section_addr_info
 438    build_section_addr_info_from_section_table (const struct target_section
 439                                                *start,
 440                                                const struct target_section
 441                                                *end);
 442
 443                         /*   Variables   */
 444
 445 /* If non-zero, shared library symbols will be added automatically
 446    when the inferior is created, new libraries are loaded, or when
 447    attaching to the inferior.  This is almost always what users will
 448    want to have happen; but for very large programs, the startup time
 449    will be excessive, and so if this is a problem, the user can clear
 450    this flag and then add the shared library symbols as needed.  Note
 451    that there is a potential for confusion, since if the shared
 452    library symbols are not loaded, commands like "info fun" will *not*
 453    report all the functions that are actually present.  */
 454
 455 extern int auto_solib_add;
 456
 457 /* From symfile.c */
 458
 459 extern void set_initial_language (void);
 460
 461 extern void find_lowest_section (bfd *, asection *, void *);
 462
 463 extern gdb_bfd_ref_ptr symfile_bfd_open (const char *);
 464
 465 extern int get_section_index (struct objfile *, const char *);
 466
 467 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 468
 469 /* Utility functions for overlay sections: */
 470 extern enum overlay_debugging_state
 471 {
 472   ovly_off,
 473   ovly_on,
 474   ovly_auto
 475 } overlay_debugging;
 476 extern int overlay_cache_invalid;
 477
 478 /* Return the "mapped" overlay section containing the PC.  */
 479 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 480
 481 /* Return any overlay section containing the PC (even in its LMA
 482    region).  */
 483 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 484
 485 /* Return true if the section is an overlay.  */
 486 extern int section_is_overlay (struct obj_section *);
 487
 488 /* Return true if the overlay section is currently "mapped".  */
 489 extern int section_is_mapped (struct obj_section *);
 490
 491 /* Return true if pc belongs to section's VMA.  */
 492 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 493
 494 /* Return true if pc belongs to section's LMA.  */
 495 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 496
 497 /* Map an address from a section's LMA to its VMA.  */
 498 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 499
 500 /* Map an address from a section's VMA to its LMA.  */
 501 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 502
 503 /* Convert an address in an overlay section (force into VMA range).  */
 504 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 505
 506 /* Load symbols from a file.  */
 507 extern void symbol_file_add_main (const char *args,
 508                                   symfile_add_flags add_flags);
 509
 510 /* Clear GDB symbol tables.  */
 511 extern void symbol_file_clear (int from_tty);
 512
 513 /* Default overlay update function.  */
 514 extern void simple_overlay_update (struct obj_section *);
 515
 516 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 517                                                  bfd_byte *);
 518
 519 extern int symfile_map_offsets_to_segments (bfd *,
 520                                             const struct symfile_segment_data *,
 521                                             struct section_offsets *,
 522                                             int, const CORE_ADDR *);
 523 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 524 void free_symfile_segment_data (struct symfile_segment_data *data);
 525
 526 extern scoped_restore_tmpl<int> increment_reading_symtab (void);
 527
 528 void expand_symtabs_matching
 529   (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 530    const lookup_name_info &lookup_name,
 531    gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 532    gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 533    enum search_domain kind);
 534
 535 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 536                            int need_fullname);
 537
 538 /* From dwarf2read.c */
 539
 540 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 541    section name (usually from the DWARF standard), while the field COMPRESSED
 542    is the name of compressed sections.  If your object file format doesn't
 543    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 544    the debugging section is not supported, the field NORMAL can be NULL too.
 545    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 546    field.  */
 547
 548 struct dwarf2_section_names {
 549   const char *normal;
 550   const char *compressed;
 551 };
 552
 553 /* List of names for dward2 debugging sections.  Also most object file formats
 554    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 555    due to restrictions.
 556    The table for the standard names is defined in dwarf2read.c.  Please
 557    update all instances of dwarf2_debug_sections if you add a field to this
 558    structure.  It is always safe to use { NULL, NULL } in this case.  */
 559
 560 struct dwarf2_debug_sections {
 561   struct dwarf2_section_names info;
 562   struct dwarf2_section_names abbrev;
 563   struct dwarf2_section_names line;
 564   struct dwarf2_section_names loc;
 565   struct dwarf2_section_names loclists;
 566   struct dwarf2_section_names macinfo;
 567   struct dwarf2_section_names macro;
 568   struct dwarf2_section_names str;
 569   struct dwarf2_section_names line_str;
 570   struct dwarf2_section_names ranges;
 571   struct dwarf2_section_names rnglists;
 572   struct dwarf2_section_names types;
 573   struct dwarf2_section_names addr;
 574   struct dwarf2_section_names frame;
 575   struct dwarf2_section_names eh_frame;
 576   struct dwarf2_section_names gdb_index;
 577   struct dwarf2_section_names debug_names;
 578   struct dwarf2_section_names debug_aranges;
 579   /* This field has no meaning, but exists solely to catch changes to
 580      this structure which are not reflected in some instance.  */
 581   int sentinel;
 582 };
 583
 584 extern int dwarf2_has_info (struct objfile *,
 585                             const struct dwarf2_debug_sections *);
 586
 587 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 588 enum dwarf2_section_enum {
 589   DWARF2_DEBUG_FRAME,
 590   DWARF2_EH_FRAME
 591 };
 592
 593 extern void dwarf2_get_section_info (struct objfile *,
 594                                      enum dwarf2_section_enum,
 595                                      asection **, const gdb_byte **,
 596                                      bfd_size_type *);
 597
 598 /* A DWARF names index variant.  */
 599 enum class dw_index_kind
 600 {
 601   /* GDB's own .gdb_index format.   */
 602   GDB_INDEX,
 603
 604   /* DWARF5 .debug_names.  */
 605   DEBUG_NAMES,
 606 };
 607
 608 /* Initialize for reading DWARF for OBJFILE.  Return false if this
 609    file will use psymtabs, or true if using an index, in which case
 610    *INDEX_KIND is set to the index variant in use.  */
 611 extern bool dwarf2_initialize_objfile (struct objfile *objfile,
 612                                        dw_index_kind *index_kind);
 613
 614 extern void dwarf2_build_psymtabs (struct objfile *);
 615 extern void dwarf2_build_frame_info (struct objfile *);
 616
 617 void dwarf2_free_objfile (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) */