gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2014 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 /* Define an array of addresses to accommodate non-contiguous dynamic
  76    loading of modules.  This is for use when entering commands, so we
  77    can keep track of the section names until we read the file and can
  78    map them to bfd sections.  This structure is also used by solib.c
  79    to communicate the section addresses in shared objects to
  80    symbol_file_add ().  */
  81
  82 struct section_addr_info
  83 {
  84   /* The number of sections for which address information is
  85      available.  */
  86   size_t num_sections;
  87   /* Sections whose names are file format dependent.  */
  88   struct other_sections
  89   {
  90     CORE_ADDR addr;
  91     char *name;
  92
  93     /* SECTINDEX must be valid for associated BFD or set to -1.  */
  94     int sectindex;
  95   } other[1];
  96 };
  97
  98
  99 /* A table listing the load segments in a symfile, and which segment
 100    each BFD section belongs to.  */
 101 struct symfile_segment_data
 102 {
 103   /* How many segments are present in this file.  If there are
 104      two, the text segment is the first one and the data segment
 105      is the second one.  */
 106   int num_segments;
 107
 108   /* If NUM_SEGMENTS is greater than zero, the original base address
 109      of each segment.  */
 110   CORE_ADDR *segment_bases;
 111
 112   /* If NUM_SEGMENTS is greater than zero, the memory size of each
 113      segment.  */
 114   CORE_ADDR *segment_sizes;
 115
 116   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
 117      recording which segment contains each BFD section.
 118      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
 119      S, or zero if it is not in any segment.  */
 120   int *segment_info;
 121 };
 122
 123 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
 124
 125 typedef void (symbol_filename_ftype) (const char *filename,
 126                                       const char *fullname, void *data);
 127
 128 /* Callback for quick_symbol_functions->expand_symtabs_matching
 129    to match a file name.  */
 130
 131 typedef int (expand_symtabs_file_matcher_ftype) (const char *filename,
 132                                                  void *data, int basenames);
 133
 134 /* Callback for quick_symbol_functions->expand_symtabs_matching
 135    to match a symbol name.  */
 136
 137 typedef int (expand_symtabs_symbol_matcher_ftype) (const char *name,
 138                                                    void *data);
 139
 140 /* The "quick" symbol functions exist so that symbol readers can
 141    avoiding an initial read of all the symbols.  For example, symbol
 142    readers might choose to use the "partial symbol table" utilities,
 143    which is one implementation of the quick symbol functions.
 144
 145    The quick symbol functions are generally opaque: the underlying
 146    representation is hidden from the caller.
 147
 148    In general, these functions should only look at whatever special
 149    index the symbol reader creates -- looking through the symbol
 150    tables themselves is handled by generic code.  If a function is
 151    defined as returning a "symbol table", this means that the function
 152    should only return a newly-created symbol table; it should not
 153    examine pre-existing ones.
 154
 155    The exact list of functions here was determined in an ad hoc way
 156    based on gdb's history.  */
 157
 158 struct quick_symbol_functions
 159 {
 160   /* Return true if this objfile has any "partial" symbols
 161      available.  */
 162   int (*has_symbols) (struct objfile *objfile);
 163
 164   /* Return the symbol table for the "last" file appearing in
 165      OBJFILE.  */
 166   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 167
 168   /* Forget all cached full file names for OBJFILE.  */
 169   void (*forget_cached_source_info) (struct objfile *objfile);
 170
 171   /* Expand and iterate over each "partial" symbol table in OBJFILE
 172      where the source file is named NAME.
 173
 174      If NAME is not absolute, a match after a '/' in the symbol table's
 175      file name will also work, REAL_PATH is NULL then.  If NAME is
 176      absolute then REAL_PATH is non-NULL absolute file name as resolved
 177      via gdb_realpath from NAME.
 178
 179      If a match is found, the "partial" symbol table is expanded.
 180      Then, this calls iterate_over_some_symtabs (or equivalent) over
 181      all newly-created symbol tables, passing CALLBACK and DATA to it.
 182      The result of this call is returned.  */
 183   int (*map_symtabs_matching_filename) (struct objfile *objfile,
 184                                         const char *name,
 185                                         const char *real_path,
 186                                         int (*callback) (struct symtab *,
 187                                                          void *),
 188                                         void *data);
 189
 190   /* Check to see if the symbol is defined in a "partial" symbol table
 191      of OBJFILE.  BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
 192      depending on whether we want to search global symbols or static
 193      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 194      indicates what sort of symbol to search for.
 195
 196      Returns the newly-expanded compunit in which the symbol is
 197      defined, or NULL if no such symbol table exists.  If OBJFILE
 198      contains !TYPE_OPAQUE symbol prefer its compunit.  If it contains
 199      only TYPE_OPAQUE symbol(s), return at least that compunit.  */
 200   struct compunit_symtab *(*lookup_symbol) (struct objfile *objfile,
 201                                             int block_index, const char *name,
 202                                             domain_enum domain);
 203
 204   /* Print statistics about any indices loaded for OBJFILE.  The
 205      statistics should be printed to gdb_stdout.  This is used for
 206      "maint print statistics".  */
 207   void (*print_stats) (struct objfile *objfile);
 208
 209   /* Dump any indices loaded for OBJFILE.  The dump should go to
 210      gdb_stdout.  This is used for "maint print objfiles".  */
 211   void (*dump) (struct objfile *objfile);
 212
 213   /* This is called by objfile_relocate to relocate any indices loaded
 214      for OBJFILE.  */
 215   void (*relocate) (struct objfile *objfile,
 216                     const struct section_offsets *new_offsets,
 217                     const struct section_offsets *delta);
 218
 219   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 220      the corresponding symbol tables are loaded.  */
 221   void (*expand_symtabs_for_function) (struct objfile *objfile,
 222                                        const char *func_name);
 223
 224   /* Read all symbol tables associated with OBJFILE.  */
 225   void (*expand_all_symtabs) (struct objfile *objfile);
 226
 227   /* Read all symbol tables associated with OBJFILE which have
 228      symtab_to_fullname equal to FULLNAME.
 229      This is for the purposes of examining code only, e.g., expand_line_sal.
 230      The routine may ignore debug info that is known to not be useful with
 231      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 232   void (*expand_symtabs_with_fullname) (struct objfile *objfile,
 233                                         const char *fullname);
 234
 235   /* Find global or static symbols in all tables that are in NAMESPACE
 236      and for which MATCH (symbol name, NAME) == 0, passing each to
 237      CALLBACK, reading in partial symbol tables as needed.  Look
 238      through global symbols if GLOBAL and otherwise static symbols.
 239      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 240      found.  After each block is processed, passes NULL to CALLBACK.
 241      MATCH must be weaker than strcmp_iw_ordered in the sense that
 242      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 243      if non-null, must be an ordering relation compatible with
 244      strcmp_iw_ordered in the sense that
 245             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 246      and
 247             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 248      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 249      CALLBACK returns 0 to indicate that the scan should continue, or
 250      non-zero to indicate that the scan should be terminated.  */
 251
 252   void (*map_matching_symbols) (struct objfile *,
 253                                 const char *name, domain_enum namespace,
 254                                 int global,
 255                                 int (*callback) (struct block *,
 256                                                  struct symbol *, void *),
 257                                 void *data,
 258                                 symbol_compare_ftype *match,
 259                                 symbol_compare_ftype *ordered_compare);
 260
 261   /* Expand all symbol tables in OBJFILE matching some criteria.
 262
 263      FILE_MATCHER is called for each file in OBJFILE.  The file name
 264      and the DATA argument are passed to it.  If it returns zero, this
 265      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 266      If BASENAMES is non-zero the function should consider only base name of
 267      DATA (passed file name is already only the lbasename part).
 268
 269      Otherwise, if KIND does not match this symbol is skipped.
 270
 271      If even KIND matches, then SYMBOL_MATCHER is called for each symbol
 272      defined in the file.  The symbol "search" name and DATA are passed
 273      to SYMBOL_MATCHER.
 274
 275      If SYMBOL_MATCHER returns zero, then this symbol is skipped.
 276
 277      Otherwise, this symbol's symbol table is expanded.
 278
 279      DATA is user data that is passed unmodified to the callback
 280      functions.  */
 281   void (*expand_symtabs_matching)
 282     (struct objfile *objfile,
 283      expand_symtabs_file_matcher_ftype *file_matcher,
 284      expand_symtabs_symbol_matcher_ftype *symbol_matcher,
 285      enum search_domain kind,
 286      void *data);
 287
 288   /* Return the comp unit from OBJFILE that contains PC and
 289      SECTION.  Return NULL if there is no such compunit.  This
 290      should return the compunit that contains a symbol whose
 291      address exactly matches PC, or, if there is no exact match, the
 292      compunit that contains a symbol whose address is closest to
 293      PC.  */
 294   struct compunit_symtab *(*find_pc_sect_compunit_symtab)
 295     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 296      CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
 297
 298   /* Call a callback for every file defined in OBJFILE whose symtab is
 299      not already read in.  FUN is the callback.  It is passed the file's
 300      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 301      the DATA passed to this function.  */
 302   void (*map_symbol_filenames) (struct objfile *objfile,
 303                                 symbol_filename_ftype *fun, void *data,
 304                                 int need_fullname);
 305 };
 306
 307 /* Structure of functions used for probe support.  If one of these functions
 308    is provided, all must be.  */
 309
 310 struct sym_probe_fns
 311 {
 312   /* If non-NULL, return an array of probe objects.
 313
 314      The returned value does not have to be freed and it has lifetime of the
 315      OBJFILE.  */
 316   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 317 };
 318
 319 /* Structure to keep track of symbol reading functions for various
 320    object file types.  */
 321
 322 struct sym_fns
 323 {
 324   /* Initializes anything that is global to the entire symbol table.
 325      It is called during symbol_file_add, when we begin debugging an
 326      entirely new program.  */
 327
 328   void (*sym_new_init) (struct objfile *);
 329
 330   /* Reads any initial information from a symbol file, and initializes
 331      the struct sym_fns SF in preparation for sym_read().  It is
 332      called every time we read a symbol file for any reason.  */
 333
 334   void (*sym_init) (struct objfile *);
 335
 336   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 337      (or possibly a symtab).  OBJFILE is the objfile struct for the
 338      file we are reading.  SYMFILE_FLAGS are the flags passed to
 339      symbol_file_add & co.  */
 340
 341   void (*sym_read) (struct objfile *, int);
 342
 343   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 344      gdb has to check other ways if this objfile has any symbols.  This may
 345      only be non-NULL if the objfile actually does have debuginfo available.
 346      */
 347
 348   void (*sym_read_psymbols) (struct objfile *);
 349
 350   /* Called when we are finished with an objfile.  Should do all
 351      cleanup that is specific to the object file format for the
 352      particular objfile.  */
 353
 354   void (*sym_finish) (struct objfile *);
 355
 356   /* This function produces a file-dependent section_offsets
 357      structure, allocated in the objfile's storage, and based on the
 358      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 359      backward compatibility with the higher levels of GDB.  It should
 360      probably be changed to a string, where NULL means the default,
 361      and others are parsed in a file dependent way.  */
 362
 363   void (*sym_offsets) (struct objfile *, const struct section_addr_info *);
 364
 365   /* This function produces a format-independent description of
 366      the segments of ABFD.  Each segment is a unit of the file
 367      which may be relocated independently.  */
 368
 369   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 370
 371   /* This function should read the linetable from the objfile when
 372      the line table cannot be read while processing the debugging
 373      information.  */
 374
 375   void (*sym_read_linetable) (struct objfile *);
 376
 377   /* Relocate the contents of a debug section SECTP.  The
 378      contents are stored in BUF if it is non-NULL, or returned in a
 379      malloc'd buffer otherwise.  */
 380
 381   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 382
 383   /* If non-NULL, this objfile has probe support, and all the probe
 384      functions referred to here will be non-NULL.  */
 385   const struct sym_probe_fns *sym_probe_fns;
 386
 387   /* The "quick" (aka partial) symbol functions for this symbol
 388      reader.  */
 389   const struct quick_symbol_functions *qf;
 390 };
 391
 392 extern struct section_addr_info *
 393   build_section_addr_info_from_objfile (const struct objfile *objfile);
 394
 395 extern void relative_addr_info_to_section_offsets
 396   (struct section_offsets *section_offsets, int num_sections,
 397    const struct section_addr_info *addrs);
 398
 399 extern void addr_info_make_relative (struct section_addr_info *addrs,
 400                                      bfd *abfd);
 401
 402 /* The default version of sym_fns.sym_offsets for readers that don't
 403    do anything special.  */
 404
 405 extern void default_symfile_offsets (struct objfile *objfile,
 406                                      const struct section_addr_info *);
 407
 408 /* The default version of sym_fns.sym_segments for readers that don't
 409    do anything special.  */
 410
 411 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 412
 413 /* The default version of sym_fns.sym_relocate for readers that don't
 414    do anything special.  */
 415
 416 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 417                                            asection *sectp, bfd_byte *buf);
 418
 419 extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
 420   ATTRIBUTE_NONNULL (1);
 421
 422 extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
 423                                                          const char *)
 424   ATTRIBUTE_NONNULL (1);
 425
 426 extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
 427
 428 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 429
 430 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 431    symbol_file_add, etc.  */
 432
 433 enum symfile_add_flags
 434   {
 435     /* Be chatty about what you are doing.  */
 436     SYMFILE_VERBOSE = 1 << 1,
 437
 438     /* This is the main symbol file (as opposed to symbol file for dynamically
 439        loaded code).  */
 440     SYMFILE_MAINLINE = 1 << 2,
 441
 442     /* Do not call breakpoint_re_set when adding this symbol file.  */
 443     SYMFILE_DEFER_BP_RESET = 1 << 3,
 444
 445     /* Do not immediately read symbols for this file.  By default,
 446        symbols are read when the objfile is created.  */
 447     SYMFILE_NO_READ = 1 << 4
 448   };
 449
 450 extern void new_symfile_objfile (struct objfile *, int);
 451
 452 extern struct objfile *symbol_file_add (const char *, int,
 453                                         struct section_addr_info *, int);
 454
 455 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, int,
 456                                                  struct section_addr_info *,
 457                                                  int, struct objfile *parent);
 458
 459 extern void symbol_file_add_separate (bfd *, const char *, int,
 460                                       struct objfile *);
 461
 462 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 463
 464 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 465
 466 extern struct section_addr_info *alloc_section_addr_info (size_t
 467                                                           num_sections);
 468
 469 /* Build (allocate and populate) a section_addr_info struct from an
 470    existing section table.  */
 471
 472 extern struct section_addr_info
 473   *build_section_addr_info_from_section_table (const struct target_section
 474                                                *start,
 475                                                const struct target_section
 476                                                *end);
 477
 478 /* Free all memory allocated by
 479    build_section_addr_info_from_section_table.  */
 480
 481 extern void free_section_addr_info (struct section_addr_info *);
 482
 483
 484                         /*   Variables   */
 485
 486 /* If non-zero, shared library symbols will be added automatically
 487    when the inferior is created, new libraries are loaded, or when
 488    attaching to the inferior.  This is almost always what users will
 489    want to have happen; but for very large programs, the startup time
 490    will be excessive, and so if this is a problem, the user can clear
 491    this flag and then add the shared library symbols as needed.  Note
 492    that there is a potential for confusion, since if the shared
 493    library symbols are not loaded, commands like "info fun" will *not*
 494    report all the functions that are actually present.  */
 495
 496 extern int auto_solib_add;
 497
 498 /* From symfile.c */
 499
 500 extern void set_initial_language (void);
 501
 502 extern void find_lowest_section (bfd *, asection *, void *);
 503
 504 extern bfd *symfile_bfd_open (const char *);
 505
 506 extern bfd *gdb_bfd_open_maybe_remote (const char *);
 507
 508 extern int get_section_index (struct objfile *, char *);
 509
 510 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 511
 512 /* Utility functions for overlay sections: */
 513 extern enum overlay_debugging_state
 514 {
 515   ovly_off,
 516   ovly_on,
 517   ovly_auto
 518 } overlay_debugging;
 519 extern int overlay_cache_invalid;
 520
 521 /* Return the "mapped" overlay section containing the PC.  */
 522 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 523
 524 /* Return any overlay section containing the PC (even in its LMA
 525    region).  */
 526 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 527
 528 /* Return true if the section is an overlay.  */
 529 extern int section_is_overlay (struct obj_section *);
 530
 531 /* Return true if the overlay section is currently "mapped".  */
 532 extern int section_is_mapped (struct obj_section *);
 533
 534 /* Return true if pc belongs to section's VMA.  */
 535 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 536
 537 /* Return true if pc belongs to section's LMA.  */
 538 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 539
 540 /* Map an address from a section's LMA to its VMA.  */
 541 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 542
 543 /* Map an address from a section's VMA to its LMA.  */
 544 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 545
 546 /* Convert an address in an overlay section (force into VMA range).  */
 547 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 548
 549 /* Load symbols from a file.  */
 550 extern void symbol_file_add_main (const char *args, int from_tty);
 551
 552 /* Clear GDB symbol tables.  */
 553 extern void symbol_file_clear (int from_tty);
 554
 555 /* Default overlay update function.  */
 556 extern void simple_overlay_update (struct obj_section *);
 557
 558 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 559                                                  bfd_byte *);
 560
 561 extern int symfile_map_offsets_to_segments (bfd *,
 562                                             const struct symfile_segment_data *,
 563                                             struct section_offsets *,
 564                                             int, const CORE_ADDR *);
 565 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 566 void free_symfile_segment_data (struct symfile_segment_data *data);
 567
 568 extern struct cleanup *increment_reading_symtab (void);
 569
 570 void expand_symtabs_matching (expand_symtabs_file_matcher_ftype *,
 571                               expand_symtabs_symbol_matcher_ftype *,
 572                               enum search_domain kind, void *data);
 573
 574 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 575                            int need_fullname);
 576
 577 /* From dwarf2read.c */
 578
 579 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 580    section name (usually from the DWARF standard), while the field COMPRESSED
 581    is the name of compressed sections.  If your object file format doesn't
 582    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 583    the debugging section is not supported, the field NORMAL can be NULL too.
 584    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 585    field.  */
 586
 587 struct dwarf2_section_names {
 588   const char *normal;
 589   const char *compressed;
 590 };
 591
 592 /* List of names for dward2 debugging sections.  Also most object file formats
 593    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 594    due to restrictions.
 595    The table for the standard names is defined in dwarf2read.c.  Please
 596    update all instances of dwarf2_debug_sections if you add a field to this
 597    structure.  It is always safe to use { NULL, NULL } in this case.  */
 598
 599 struct dwarf2_debug_sections {
 600   struct dwarf2_section_names info;
 601   struct dwarf2_section_names abbrev;
 602   struct dwarf2_section_names line;
 603   struct dwarf2_section_names loc;
 604   struct dwarf2_section_names macinfo;
 605   struct dwarf2_section_names macro;
 606   struct dwarf2_section_names str;
 607   struct dwarf2_section_names ranges;
 608   struct dwarf2_section_names types;
 609   struct dwarf2_section_names addr;
 610   struct dwarf2_section_names frame;
 611   struct dwarf2_section_names eh_frame;
 612   struct dwarf2_section_names gdb_index;
 613   /* This field has no meaning, but exists solely to catch changes to
 614      this structure which are not reflected in some instance.  */
 615   int sentinel;
 616 };
 617
 618 extern int dwarf2_has_info (struct objfile *,
 619                             const struct dwarf2_debug_sections *);
 620
 621 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 622 enum dwarf2_section_enum {
 623   DWARF2_DEBUG_FRAME,
 624   DWARF2_EH_FRAME
 625 };
 626
 627 extern void dwarf2_get_section_info (struct objfile *,
 628                                      enum dwarf2_section_enum,
 629                                      asection **, const gdb_byte **,
 630                                      bfd_size_type *);
 631
 632 extern int dwarf2_initialize_objfile (struct objfile *);
 633 extern void dwarf2_build_psymtabs (struct objfile *);
 634 extern void dwarf2_build_frame_info (struct objfile *);
 635
 636 void dwarf2_free_objfile (struct objfile *);
 637
 638 /* From mdebugread.c */
 639
 640 extern void mdebug_build_psymtabs (struct objfile *,
 641                                    const struct ecoff_debug_swap *,
 642                                    struct ecoff_debug_info *);
 643
 644 extern void elfmdebug_build_psymtabs (struct objfile *,
 645                                       const struct ecoff_debug_swap *,
 646                                       asection *);
 647
 648 /* From minidebug.c.  */
 649
 650 extern bfd *find_separate_debug_file_in_section (struct objfile *);
 651
 652 #endif /* !defined(SYMFILE_H) */