gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2015 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
  27 /* Opaque declarations.  */
  28 struct target_section;
  29 struct objfile;
  30 struct obj_section;
  31 struct obstack;
  32 struct block;
  33 struct probe;
  34 struct value;
  35 struct frame_info;
  36 struct agent_expr;
  37 struct axs_value;
  38
  39 /* Comparison function for symbol look ups.  */
  40
  41 typedef int (symbol_compare_ftype) (const char *string1,
  42                                     const char *string2);
  43
  44 /* Partial symbols are stored in the psymbol_cache and pointers to
  45    them are kept in a dynamically grown array that is obtained from
  46    malloc and grown as necessary via realloc.  Each objfile typically
  47    has two of these, one for global symbols and one for static
  48    symbols.  Although this adds a level of indirection for storing or
  49    accessing the partial symbols, it allows us to throw away duplicate
  50    psymbols and set all pointers to the single saved instance.  */
  51
  52 struct psymbol_allocation_list
  53 {
  54
  55   /* Pointer to beginning of dynamically allocated array of pointers
  56      to partial symbols.  The array is dynamically expanded as
  57      necessary to accommodate more pointers.  */
  58
  59   struct partial_symbol **list;
  60
  61   /* Pointer to next available slot in which to store a pointer to a
  62      partial symbol.  */
  63
  64   struct partial_symbol **next;
  65
  66   /* Number of allocated pointer slots in current dynamic array (not
  67      the number of bytes of storage).  The "next" pointer will always
  68      point somewhere between list[0] and list[size], and when at
  69      list[size] the array will be expanded on the next attempt to
  70      store a pointer.  */
  71
  72   int size;
  73 };
  74
  75 struct other_sections
  76 {
  77   CORE_ADDR addr;
  78   char *name;
  79
  80   /* SECTINDEX must be valid for associated BFD or set to -1.  */
  81   int sectindex;
  82 };
  83
  84 /* Define an array of addresses to accommodate non-contiguous dynamic
  85    loading of modules.  This is for use when entering commands, so we
  86    can keep track of the section names until we read the file and can
  87    map them to bfd sections.  This structure is also used by solib.c
  88    to communicate the section addresses in shared objects to
  89    symbol_file_add ().  */
  90
  91 struct section_addr_info
  92 {
  93   /* The number of sections for which address information is
  94      available.  */
  95   size_t num_sections;
  96   /* Sections whose names are file format dependent.  */
  97   struct other_sections other[1];
  98 };
  99
 100
 101 /* A table listing the load segments in a symfile, and which segment
 102    each BFD section belongs to.  */
 103 struct symfile_segment_data
 104 {
 105   /* How many segments are present in this file.  If there are
 106      two, the text segment is the first one and the data segment
 107      is the second one.  */
 108   int num_segments;
 109
 110   /* If NUM_SEGMENTS is greater than zero, the original base address
 111      of each segment.  */
 112   CORE_ADDR *segment_bases;
 113
 114   /* If NUM_SEGMENTS is greater than zero, the memory size of each
 115      segment.  */
 116   CORE_ADDR *segment_sizes;
 117
 118   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
 119      recording which segment contains each BFD section.
 120      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
 121      S, or zero if it is not in any segment.  */
 122   int *segment_info;
 123 };
 124
 125 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
 126
 127 typedef void (symbol_filename_ftype) (const char *filename,
 128                                       const char *fullname, void *data);
 129
 130 /* Callback for quick_symbol_functions->expand_symtabs_matching
 131    to match a file name.  */
 132
 133 typedef int (expand_symtabs_file_matcher_ftype) (const char *filename,
 134                                                  void *data, int basenames);
 135
 136 /* Callback for quick_symbol_functions->expand_symtabs_matching
 137    to match a symbol name.  */
 138
 139 typedef int (expand_symtabs_symbol_matcher_ftype) (const char *name,
 140                                                    void *data);
 141
 142 /* Callback for quick_symbol_functions->expand_symtabs_matching
 143    to be called after a symtab has been expanded.  */
 144
 145 typedef void (expand_symtabs_exp_notify_ftype) \
 146   (struct compunit_symtab *symtab, void *data);
 147
 148 /* The "quick" symbol functions exist so that symbol readers can
 149    avoiding an initial read of all the symbols.  For example, symbol
 150    readers might choose to use the "partial symbol table" utilities,
 151    which is one implementation of the quick symbol functions.
 152
 153    The quick symbol functions are generally opaque: the underlying
 154    representation is hidden from the caller.
 155
 156    In general, these functions should only look at whatever special
 157    index the symbol reader creates -- looking through the symbol
 158    tables themselves is handled by generic code.  If a function is
 159    defined as returning a "symbol table", this means that the function
 160    should only return a newly-created symbol table; it should not
 161    examine pre-existing ones.
 162
 163    The exact list of functions here was determined in an ad hoc way
 164    based on gdb's history.  */
 165
 166 struct quick_symbol_functions
 167 {
 168   /* Return true if this objfile has any "partial" symbols
 169      available.  */
 170   int (*has_symbols) (struct objfile *objfile);
 171
 172   /* Return the symbol table for the "last" file appearing in
 173      OBJFILE.  */
 174   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 175
 176   /* Forget all cached full file names for OBJFILE.  */
 177   void (*forget_cached_source_info) (struct objfile *objfile);
 178
 179   /* Expand and iterate over each "partial" symbol table in OBJFILE
 180      where the source file is named NAME.
 181
 182      If NAME is not absolute, a match after a '/' in the symbol table's
 183      file name will also work, REAL_PATH is NULL then.  If NAME is
 184      absolute then REAL_PATH is non-NULL absolute file name as resolved
 185      via gdb_realpath from NAME.
 186
 187      If a match is found, the "partial" symbol table is expanded.
 188      Then, this calls iterate_over_some_symtabs (or equivalent) over
 189      all newly-created symbol tables, passing CALLBACK and DATA to it.
 190      The result of this call is returned.  */
 191   int (*map_symtabs_matching_filename) (struct objfile *objfile,
 192                                         const char *name,
 193                                         const char *real_path,
 194                                         int (*callback) (struct symtab *,
 195                                                          void *),
 196                                         void *data);
 197
 198   /* Check to see if the symbol is defined in a "partial" symbol table
 199      of OBJFILE.  BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
 200      depending on whether we want to search global symbols or static
 201      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 202      indicates what sort of symbol to search for.
 203
 204      Returns the newly-expanded compunit in which the symbol is
 205      defined, or NULL if no such symbol table exists.  If OBJFILE
 206      contains !TYPE_OPAQUE symbol prefer its compunit.  If it contains
 207      only TYPE_OPAQUE symbol(s), return at least that compunit.  */
 208   struct compunit_symtab *(*lookup_symbol) (struct objfile *objfile,
 209                                             int block_index, const char *name,
 210                                             domain_enum domain);
 211
 212   /* Print statistics about any indices loaded for OBJFILE.  The
 213      statistics should be printed to gdb_stdout.  This is used for
 214      "maint print statistics".  */
 215   void (*print_stats) (struct objfile *objfile);
 216
 217   /* Dump any indices loaded for OBJFILE.  The dump should go to
 218      gdb_stdout.  This is used for "maint print objfiles".  */
 219   void (*dump) (struct objfile *objfile);
 220
 221   /* This is called by objfile_relocate to relocate any indices loaded
 222      for OBJFILE.  */
 223   void (*relocate) (struct objfile *objfile,
 224                     const struct section_offsets *new_offsets,
 225                     const struct section_offsets *delta);
 226
 227   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 228      the corresponding symbol tables are loaded.  */
 229   void (*expand_symtabs_for_function) (struct objfile *objfile,
 230                                        const char *func_name);
 231
 232   /* Read all symbol tables associated with OBJFILE.  */
 233   void (*expand_all_symtabs) (struct objfile *objfile);
 234
 235   /* Read all symbol tables associated with OBJFILE which have
 236      symtab_to_fullname equal to FULLNAME.
 237      This is for the purposes of examining code only, e.g., expand_line_sal.
 238      The routine may ignore debug info that is known to not be useful with
 239      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 240   void (*expand_symtabs_with_fullname) (struct objfile *objfile,
 241                                         const char *fullname);
 242
 243   /* Find global or static symbols in all tables that are in DOMAIN
 244      and for which MATCH (symbol name, NAME) == 0, passing each to
 245      CALLBACK, reading in partial symbol tables as needed.  Look
 246      through global symbols if GLOBAL and otherwise static symbols.
 247      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 248      found.  After each block is processed, passes NULL to CALLBACK.
 249      MATCH must be weaker than strcmp_iw_ordered in the sense that
 250      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 251      if non-null, must be an ordering relation compatible with
 252      strcmp_iw_ordered in the sense that
 253             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 254      and
 255             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 256      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 257      CALLBACK returns 0 to indicate that the scan should continue, or
 258      non-zero to indicate that the scan should be terminated.  */
 259
 260   void (*map_matching_symbols) (struct objfile *,
 261                                 const char *name, domain_enum domain,
 262                                 int global,
 263                                 int (*callback) (struct block *,
 264                                                  struct symbol *, void *),
 265                                 void *data,
 266                                 symbol_compare_ftype *match,
 267                                 symbol_compare_ftype *ordered_compare);
 268
 269   /* Expand all symbol tables in OBJFILE matching some criteria.
 270
 271      FILE_MATCHER is called for each file in OBJFILE.  The file name
 272      and the DATA argument are passed to it.  If it returns zero, this
 273      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 274      If BASENAMES is non-zero the function should consider only base name of
 275      DATA (passed file name is already only the lbasename part).
 276
 277      Otherwise, if KIND does not match this symbol is skipped.
 278
 279      If even KIND matches, then SYMBOL_MATCHER is called for each symbol
 280      defined in the file.  The symbol "search" name and DATA are passed
 281      to SYMBOL_MATCHER.
 282
 283      If SYMBOL_MATCHER returns zero, then this symbol is skipped.
 284
 285      Otherwise, this symbol's symbol table is expanded.
 286
 287      DATA is user data that is passed unmodified to the callback
 288      functions.  */
 289   void (*expand_symtabs_matching)
 290     (struct objfile *objfile,
 291      expand_symtabs_file_matcher_ftype *file_matcher,
 292      expand_symtabs_symbol_matcher_ftype *symbol_matcher,
 293      expand_symtabs_exp_notify_ftype *expansion_notify,
 294      enum search_domain kind,
 295      void *data);
 296
 297   /* Return the comp unit from OBJFILE that contains PC and
 298      SECTION.  Return NULL if there is no such compunit.  This
 299      should return the compunit that contains a symbol whose
 300      address exactly matches PC, or, if there is no exact match, the
 301      compunit that contains a symbol whose address is closest to
 302      PC.  */
 303   struct compunit_symtab *(*find_pc_sect_compunit_symtab)
 304     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 305      CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
 306
 307   /* Call a callback for every file defined in OBJFILE whose symtab is
 308      not already read in.  FUN is the callback.  It is passed the file's
 309      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 310      the DATA passed to this function.  */
 311   void (*map_symbol_filenames) (struct objfile *objfile,
 312                                 symbol_filename_ftype *fun, void *data,
 313                                 int need_fullname);
 314 };
 315
 316 /* Structure of functions used for probe support.  If one of these functions
 317    is provided, all must be.  */
 318
 319 struct sym_probe_fns
 320 {
 321   /* If non-NULL, return an array of probe objects.
 322
 323      The returned value does not have to be freed and it has lifetime of the
 324      OBJFILE.  */
 325   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 326 };
 327
 328 /* Structure to keep track of symbol reading functions for various
 329    object file types.  */
 330
 331 struct sym_fns
 332 {
 333   /* Initializes anything that is global to the entire symbol table.
 334      It is called during symbol_file_add, when we begin debugging an
 335      entirely new program.  */
 336
 337   void (*sym_new_init) (struct objfile *);
 338
 339   /* Reads any initial information from a symbol file, and initializes
 340      the struct sym_fns SF in preparation for sym_read().  It is
 341      called every time we read a symbol file for any reason.  */
 342
 343   void (*sym_init) (struct objfile *);
 344
 345   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 346      (or possibly a symtab).  OBJFILE is the objfile struct for the
 347      file we are reading.  SYMFILE_FLAGS are the flags passed to
 348      symbol_file_add & co.  */
 349
 350   void (*sym_read) (struct objfile *, int);
 351
 352   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 353      gdb has to check other ways if this objfile has any symbols.  This may
 354      only be non-NULL if the objfile actually does have debuginfo available.
 355      */
 356
 357   void (*sym_read_psymbols) (struct objfile *);
 358
 359   /* Called when we are finished with an objfile.  Should do all
 360      cleanup that is specific to the object file format for the
 361      particular objfile.  */
 362
 363   void (*sym_finish) (struct objfile *);
 364
 365
 366   /* This function produces a file-dependent section_offsets
 367      structure, allocated in the objfile's storage.
 368
 369      The section_addr_info structure contains the offset of loadable and
 370      allocated sections, relative to the absolute offsets found in the BFD.  */
 371
 372   void (*sym_offsets) (struct objfile *, const struct section_addr_info *);
 373
 374   /* This function produces a format-independent description of
 375      the segments of ABFD.  Each segment is a unit of the file
 376      which may be relocated independently.  */
 377
 378   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 379
 380   /* This function should read the linetable from the objfile when
 381      the line table cannot be read while processing the debugging
 382      information.  */
 383
 384   void (*sym_read_linetable) (struct objfile *);
 385
 386   /* Relocate the contents of a debug section SECTP.  The
 387      contents are stored in BUF if it is non-NULL, or returned in a
 388      malloc'd buffer otherwise.  */
 389
 390   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 391
 392   /* If non-NULL, this objfile has probe support, and all the probe
 393      functions referred to here will be non-NULL.  */
 394   const struct sym_probe_fns *sym_probe_fns;
 395
 396   /* The "quick" (aka partial) symbol functions for this symbol
 397      reader.  */
 398   const struct quick_symbol_functions *qf;
 399 };
 400
 401 extern struct section_addr_info *
 402   build_section_addr_info_from_objfile (const struct objfile *objfile);
 403
 404 extern void relative_addr_info_to_section_offsets
 405   (struct section_offsets *section_offsets, int num_sections,
 406    const struct section_addr_info *addrs);
 407
 408 extern void addr_info_make_relative (struct section_addr_info *addrs,
 409                                      bfd *abfd);
 410
 411 /* The default version of sym_fns.sym_offsets for readers that don't
 412    do anything special.  */
 413
 414 extern void default_symfile_offsets (struct objfile *objfile,
 415                                      const struct section_addr_info *);
 416
 417 /* The default version of sym_fns.sym_segments for readers that don't
 418    do anything special.  */
 419
 420 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 421
 422 /* The default version of sym_fns.sym_relocate for readers that don't
 423    do anything special.  */
 424
 425 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 426                                            asection *sectp, bfd_byte *buf);
 427
 428 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 429   ATTRIBUTE_NONNULL (1);
 430
 431 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 432                                                          const char *)
 433   ATTRIBUTE_NONNULL (1);
 434
 435 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 436
 437 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 438
 439 extern void clear_symtab_users (int add_flags);
 440
 441 extern enum language deduce_language_from_filename (const char *);
 442
 443 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 444    symbol_file_add, etc.  */
 445
 446 enum symfile_add_flags
 447   {
 448     /* Be chatty about what you are doing.  */
 449     SYMFILE_VERBOSE = 1 << 1,
 450
 451     /* This is the main symbol file (as opposed to symbol file for dynamically
 452        loaded code).  */
 453     SYMFILE_MAINLINE = 1 << 2,
 454
 455     /* Do not call breakpoint_re_set when adding this symbol file.  */
 456     SYMFILE_DEFER_BP_RESET = 1 << 3,
 457
 458     /* Do not immediately read symbols for this file.  By default,
 459        symbols are read when the objfile is created.  */
 460     SYMFILE_NO_READ = 1 << 4
 461   };
 462
 463 extern struct objfile *symbol_file_add (const char *, int,
 464                                         struct section_addr_info *, int);
 465
 466 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, int,
 467                                                  struct section_addr_info *,
 468                                                  int, struct objfile *parent);
 469
 470 extern void symbol_file_add_separate (bfd *, const char *, int,
 471                                       struct objfile *);
 472
 473 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 474
 475 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 476
 477 extern struct section_addr_info *alloc_section_addr_info (size_t
 478                                                           num_sections);
 479
 480 /* Build (allocate and populate) a section_addr_info struct from an
 481    existing section table.  */
 482
 483 extern struct section_addr_info
 484   *build_section_addr_info_from_section_table (const struct target_section
 485                                                *start,
 486                                                const struct target_section
 487                                                *end);
 488
 489 /* Free all memory allocated by
 490    build_section_addr_info_from_section_table.  */
 491
 492 extern void free_section_addr_info (struct section_addr_info *);
 493
 494
 495                         /*   Variables   */
 496
 497 /* If non-zero, shared library symbols will be added automatically
 498    when the inferior is created, new libraries are loaded, or when
 499    attaching to the inferior.  This is almost always what users will
 500    want to have happen; but for very large programs, the startup time
 501    will be excessive, and so if this is a problem, the user can clear
 502    this flag and then add the shared library symbols as needed.  Note
 503    that there is a potential for confusion, since if the shared
 504    library symbols are not loaded, commands like "info fun" will *not*
 505    report all the functions that are actually present.  */
 506
 507 extern int auto_solib_add;
 508
 509 /* From symfile.c */
 510
 511 extern void set_initial_language (void);
 512
 513 extern void find_lowest_section (bfd *, asection *, void *);
 514
 515 extern bfd *symfile_bfd_open (const char *);
 516
 517 extern bfd *gdb_bfd_open_maybe_remote (const char *);
 518
 519 extern int get_section_index (struct objfile *, char *);
 520
 521 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 522
 523 /* Utility functions for overlay sections: */
 524 extern enum overlay_debugging_state
 525 {
 526   ovly_off,
 527   ovly_on,
 528   ovly_auto
 529 } overlay_debugging;
 530 extern int overlay_cache_invalid;
 531
 532 /* Return the "mapped" overlay section containing the PC.  */
 533 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 534
 535 /* Return any overlay section containing the PC (even in its LMA
 536    region).  */
 537 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 538
 539 /* Return true if the section is an overlay.  */
 540 extern int section_is_overlay (struct obj_section *);
 541
 542 /* Return true if the overlay section is currently "mapped".  */
 543 extern int section_is_mapped (struct obj_section *);
 544
 545 /* Return true if pc belongs to section's VMA.  */
 546 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 547
 548 /* Return true if pc belongs to section's LMA.  */
 549 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 550
 551 /* Map an address from a section's LMA to its VMA.  */
 552 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 553
 554 /* Map an address from a section's VMA to its LMA.  */
 555 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 556
 557 /* Convert an address in an overlay section (force into VMA range).  */
 558 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 559
 560 /* Load symbols from a file.  */
 561 extern void symbol_file_add_main (const char *args, int from_tty);
 562
 563 /* Clear GDB symbol tables.  */
 564 extern void symbol_file_clear (int from_tty);
 565
 566 /* Default overlay update function.  */
 567 extern void simple_overlay_update (struct obj_section *);
 568
 569 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 570                                                  bfd_byte *);
 571
 572 extern int symfile_map_offsets_to_segments (bfd *,
 573                                             const struct symfile_segment_data *,
 574                                             struct section_offsets *,
 575                                             int, const CORE_ADDR *);
 576 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 577 void free_symfile_segment_data (struct symfile_segment_data *data);
 578
 579 extern struct cleanup *increment_reading_symtab (void);
 580
 581 void expand_symtabs_matching (expand_symtabs_file_matcher_ftype *,
 582                               expand_symtabs_symbol_matcher_ftype *,
 583                               expand_symtabs_exp_notify_ftype *,
 584                               enum search_domain kind, void *data);
 585
 586 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 587                            int need_fullname);
 588
 589 /* From dwarf2read.c */
 590
 591 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 592    section name (usually from the DWARF standard), while the field COMPRESSED
 593    is the name of compressed sections.  If your object file format doesn't
 594    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 595    the debugging section is not supported, the field NORMAL can be NULL too.
 596    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 597    field.  */
 598
 599 struct dwarf2_section_names {
 600   const char *normal;
 601   const char *compressed;
 602 };
 603
 604 /* List of names for dward2 debugging sections.  Also most object file formats
 605    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 606    due to restrictions.
 607    The table for the standard names is defined in dwarf2read.c.  Please
 608    update all instances of dwarf2_debug_sections if you add a field to this
 609    structure.  It is always safe to use { NULL, NULL } in this case.  */
 610
 611 struct dwarf2_debug_sections {
 612   struct dwarf2_section_names info;
 613   struct dwarf2_section_names abbrev;
 614   struct dwarf2_section_names line;
 615   struct dwarf2_section_names loc;
 616   struct dwarf2_section_names macinfo;
 617   struct dwarf2_section_names macro;
 618   struct dwarf2_section_names str;
 619   struct dwarf2_section_names ranges;
 620   struct dwarf2_section_names types;
 621   struct dwarf2_section_names addr;
 622   struct dwarf2_section_names frame;
 623   struct dwarf2_section_names eh_frame;
 624   struct dwarf2_section_names gdb_index;
 625   /* This field has no meaning, but exists solely to catch changes to
 626      this structure which are not reflected in some instance.  */
 627   int sentinel;
 628 };
 629
 630 extern int dwarf2_has_info (struct objfile *,
 631                             const struct dwarf2_debug_sections *);
 632
 633 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 634 enum dwarf2_section_enum {
 635   DWARF2_DEBUG_FRAME,
 636   DWARF2_EH_FRAME
 637 };
 638
 639 extern void dwarf2_get_section_info (struct objfile *,
 640                                      enum dwarf2_section_enum,
 641                                      asection **, const gdb_byte **,
 642                                      bfd_size_type *);
 643
 644 extern int dwarf2_initialize_objfile (struct objfile *);
 645 extern void dwarf2_build_psymtabs (struct objfile *);
 646 extern void dwarf2_build_frame_info (struct objfile *);
 647
 648 void dwarf2_free_objfile (struct objfile *);
 649
 650 /* From mdebugread.c */
 651
 652 extern void mdebug_build_psymtabs (struct objfile *,
 653                                    const struct ecoff_debug_swap *,
 654                                    struct ecoff_debug_info *);
 655
 656 extern void elfmdebug_build_psymtabs (struct objfile *,
 657                                       const struct ecoff_debug_swap *,
 658                                       asection *);
 659
 660 /* From minidebug.c.  */
 661
 662 extern bfd *find_separate_debug_file_in_section (struct objfile *);
 663
 664 #endif /* !defined(SYMFILE_H) */