gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2013 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 /* The "quick" symbol functions exist so that symbol readers can
 129    avoiding an initial read of all the symbols.  For example, symbol
 130    readers might choose to use the "partial symbol table" utilities,
 131    which is one implementation of the quick symbol functions.
 132
 133    The quick symbol functions are generally opaque: the underlying
 134    representation is hidden from the caller.
 135
 136    In general, these functions should only look at whatever special
 137    index the symbol reader creates -- looking through the symbol
 138    tables themselves is handled by generic code.  If a function is
 139    defined as returning a "symbol table", this means that the function
 140    should only return a newly-created symbol table; it should not
 141    examine pre-existing ones.
 142
 143    The exact list of functions here was determined in an ad hoc way
 144    based on gdb's history.  */
 145
 146 struct quick_symbol_functions
 147 {
 148   /* Return true if this objfile has any "partial" symbols
 149      available.  */
 150   int (*has_symbols) (struct objfile *objfile);
 151
 152   /* Return the symbol table for the "last" file appearing in
 153      OBJFILE.  */
 154   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 155
 156   /* Forget all cached full file names for OBJFILE.  */
 157   void (*forget_cached_source_info) (struct objfile *objfile);
 158
 159   /* Expand and iterate over each "partial" symbol table in OBJFILE
 160      where the source file is named NAME.
 161
 162      If NAME is not absolute, a match after a '/' in the symbol
 163      table's file name will also work.  REAL_PATH is the absolute file
 164      name run through gdb_realpath.
 165
 166      If a match is found, the "partial" symbol table is expanded.
 167      Then, this calls iterate_over_some_symtabs (or equivalent) over
 168      all newly-created symbol tables, passing CALLBACK and DATA to it.
 169      The result of this call is returned.  */
 170   int (*map_symtabs_matching_filename) (struct objfile *objfile,
 171                                         const char *name,
 172                                         const char *real_path,
 173                                         int (*callback) (struct symtab *,
 174                                                          void *),
 175                                         void *data);
 176
 177   /* Check to see if the symbol is defined in a "partial" symbol table
 178      of OBJFILE.  KIND should be either GLOBAL_BLOCK or STATIC_BLOCK,
 179      depending on whether we want to search global symbols or static
 180      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 181      indicates what sort of symbol to search for.
 182
 183      Returns the newly-expanded symbol table in which the symbol is
 184      defined, or NULL if no such symbol table exists.  If OBJFILE
 185      contains !TYPE_OPAQUE symbol prefer its symtab.  If it contains
 186      only TYPE_OPAQUE symbol(s), return at least that symtab.  */
 187   struct symtab *(*lookup_symbol) (struct objfile *objfile,
 188                                    int kind, const char *name,
 189                                    domain_enum domain);
 190
 191   /* Print statistics about any indices loaded for OBJFILE.  The
 192      statistics should be printed to gdb_stdout.  This is used for
 193      "maint print statistics".  */
 194   void (*print_stats) (struct objfile *objfile);
 195
 196   /* Dump any indices loaded for OBJFILE.  The dump should go to
 197      gdb_stdout.  This is used for "maint print objfiles".  */
 198   void (*dump) (struct objfile *objfile);
 199
 200   /* This is called by objfile_relocate to relocate any indices loaded
 201      for OBJFILE.  */
 202   void (*relocate) (struct objfile *objfile,
 203                     struct section_offsets *new_offsets,
 204                     struct section_offsets *delta);
 205
 206   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 207      the corresponding symbol tables are loaded.  */
 208   void (*expand_symtabs_for_function) (struct objfile *objfile,
 209                                        const char *func_name);
 210
 211   /* Read all symbol tables associated with OBJFILE.  */
 212   void (*expand_all_symtabs) (struct objfile *objfile);
 213
 214   /* Read all symbol tables associated with OBJFILE which have the
 215      file name FILENAME.
 216      This is for the purposes of examining code only, e.g., expand_line_sal.
 217      The routine may ignore debug info that is known to not be useful with
 218      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 219   void (*expand_symtabs_with_filename) (struct objfile *objfile,
 220                                         const char *filename);
 221
 222   /* Return the file name of the file holding the global symbol in OBJFILE
 223      named NAME.  If no such symbol exists in OBJFILE, return NULL.  */
 224   const char *(*find_symbol_file) (struct objfile *objfile, const char *name);
 225
 226   /* Find global or static symbols in all tables that are in NAMESPACE
 227      and for which MATCH (symbol name, NAME) == 0, passing each to
 228      CALLBACK, reading in partial symbol tables as needed.  Look
 229      through global symbols if GLOBAL and otherwise static symbols.
 230      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 231      found.  After each block is processed, passes NULL to CALLBACK.
 232      MATCH must be weaker than strcmp_iw_ordered in the sense that
 233      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 234      if non-null, must be an ordering relation compatible with
 235      strcmp_iw_ordered in the sense that
 236             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 237      and
 238             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 239      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 240      CALLBACK returns 0 to indicate that the scan should continue, or
 241      non-zero to indicate that the scan should be terminated.  */
 242
 243   void (*map_matching_symbols) (const char *name, domain_enum namespace,
 244                                 struct objfile *, int global,
 245                                 int (*callback) (struct block *,
 246                                                  struct symbol *, void *),
 247                                 void *data,
 248                                 symbol_compare_ftype *match,
 249                                 symbol_compare_ftype *ordered_compare);
 250
 251   /* Expand all symbol tables in OBJFILE matching some criteria.
 252
 253      FILE_MATCHER is called for each file in OBJFILE.  The file name
 254      and the DATA argument are passed to it.  If it returns zero, this
 255      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 256
 257      Otherwise, if KIND does not match this symbol is skipped.
 258
 259      If even KIND matches, then NAME_MATCHER is called for each symbol
 260      defined in the file.  The symbol "search" name and DATA are passed
 261      to NAME_MATCHER.
 262
 263      If NAME_MATCHER returns zero, then this symbol is skipped.
 264
 265      Otherwise, this symbol's symbol table is expanded.
 266
 267      DATA is user data that is passed unmodified to the callback
 268      functions.  */
 269   void (*expand_symtabs_matching)
 270     (struct objfile *objfile,
 271      int (*file_matcher) (const char *, void *),
 272      int (*name_matcher) (const char *, void *),
 273      enum search_domain kind,
 274      void *data);
 275
 276   /* Return the symbol table from OBJFILE that contains PC and
 277      SECTION.  Return NULL if there is no such symbol table.  This
 278      should return the symbol table that contains a symbol whose
 279      address exactly matches PC, or, if there is no exact match, the
 280      symbol table that contains a symbol whose address is closest to
 281      PC.  */
 282   struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
 283                                          struct minimal_symbol *msymbol,
 284                                          CORE_ADDR pc,
 285                                          struct obj_section *section,
 286                                          int warn_if_readin);
 287
 288   /* Call a callback for every file defined in OBJFILE whose symtab is
 289      not already read in.  FUN is the callback.  It is passed the file's
 290      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 291      the DATA passed to this function.  */
 292   void (*map_symbol_filenames) (struct objfile *objfile,
 293                                 symbol_filename_ftype *fun, void *data,
 294                                 int need_fullname);
 295 };
 296
 297 /* Structure of functions used for probe support.  If one of these functions
 298    is provided, all must be.  */
 299
 300 struct sym_probe_fns
 301 {
 302   /* If non-NULL, return an array of probe objects.
 303
 304      The returned value does not have to be freed and it has lifetime of the
 305      OBJFILE.  */
 306   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 307
 308   /* Return the number of arguments available to PROBE.  PROBE will
 309      have come from a call to this objfile's sym_get_probes method.
 310      If you provide an implementation of sym_get_probes, you must
 311      implement this method as well.  */
 312   unsigned (*sym_get_probe_argument_count) (struct probe *probe);
 313
 314   /* Evaluate the Nth argument available to PROBE.  PROBE will have
 315      come from a call to this objfile's sym_get_probes method.  N will
 316      be between 0 and the number of arguments available to this probe.
 317      FRAME is the frame in which the evaluation is done; the frame's
 318      PC will match the address of the probe.  If you provide an
 319      implementation of sym_get_probes, you must implement this method
 320      as well.  */
 321   struct value *(*sym_evaluate_probe_argument) (struct probe *probe,
 322                                                 unsigned n);
 323
 324   /* Compile the Nth probe argument to an agent expression.  PROBE
 325      will have come from a call to this objfile's sym_get_probes
 326      method.  N will be between 0 and the number of arguments
 327      available to this probe.  EXPR and VALUE are the agent expression
 328      that is being updated.  */
 329   void (*sym_compile_to_ax) (struct probe *probe,
 330                              struct agent_expr *expr,
 331                              struct axs_value *value,
 332                              unsigned n);
 333
 334   /* Relocate the probe section of OBJFILE.  */
 335   void (*sym_relocate_probe) (struct objfile *objfile,
 336                               struct section_offsets *new_offsets,
 337                               struct section_offsets *delta);
 338 };
 339
 340 /* Structure to keep track of symbol reading functions for various
 341    object file types.  */
 342
 343 struct sym_fns
 344 {
 345
 346   /* BFD flavour that we handle, or (as a special kludge, see
 347      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 348
 349   enum bfd_flavour sym_flavour;
 350
 351   /* Initializes anything that is global to the entire symbol table.
 352      It is called during symbol_file_add, when we begin debugging an
 353      entirely new program.  */
 354
 355   void (*sym_new_init) (struct objfile *);
 356
 357   /* Reads any initial information from a symbol file, and initializes
 358      the struct sym_fns SF in preparation for sym_read().  It is
 359      called every time we read a symbol file for any reason.  */
 360
 361   void (*sym_init) (struct objfile *);
 362
 363   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 364      (or possibly a symtab).  OBJFILE is the objfile struct for the
 365      file we are reading.  SYMFILE_FLAGS are the flags passed to
 366      symbol_file_add & co.  */
 367
 368   void (*sym_read) (struct objfile *, int);
 369
 370   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 371      gdb has to check other ways if this objfile has any symbols.  This may
 372      only be non-NULL if the objfile actually does have debuginfo available.
 373      */
 374
 375   void (*sym_read_psymbols) (struct objfile *);
 376
 377   /* Called when we are finished with an objfile.  Should do all
 378      cleanup that is specific to the object file format for the
 379      particular objfile.  */
 380
 381   void (*sym_finish) (struct objfile *);
 382
 383   /* This function produces a file-dependent section_offsets
 384      structure, allocated in the objfile's storage, and based on the
 385      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 386      backward compatibility with the higher levels of GDB.  It should
 387      probably be changed to a string, where NULL means the default,
 388      and others are parsed in a file dependent way.  */
 389
 390   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 391
 392   /* This function produces a format-independent description of
 393      the segments of ABFD.  Each segment is a unit of the file
 394      which may be relocated independently.  */
 395
 396   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 397
 398   /* This function should read the linetable from the objfile when
 399      the line table cannot be read while processing the debugging
 400      information.  */
 401
 402   void (*sym_read_linetable) (void);
 403
 404   /* Relocate the contents of a debug section SECTP.  The
 405      contents are stored in BUF if it is non-NULL, or returned in a
 406      malloc'd buffer otherwise.  */
 407
 408   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 409
 410   /* If non-NULL, this objfile has probe support, and all the probe
 411      functions referred to here will be non-NULL.  */
 412   const struct sym_probe_fns *sym_probe_fns;
 413
 414   /* The "quick" (aka partial) symbol functions for this symbol
 415      reader.  */
 416   const struct quick_symbol_functions *qf;
 417 };
 418
 419 extern struct section_addr_info *
 420   build_section_addr_info_from_objfile (const struct objfile *objfile);
 421
 422 extern void relative_addr_info_to_section_offsets
 423   (struct section_offsets *section_offsets, int num_sections,
 424    struct section_addr_info *addrs);
 425
 426 extern void addr_info_make_relative (struct section_addr_info *addrs,
 427                                      bfd *abfd);
 428
 429 /* The default version of sym_fns.sym_offsets for readers that don't
 430    do anything special.  */
 431
 432 extern void default_symfile_offsets (struct objfile *objfile,
 433                                      struct section_addr_info *);
 434
 435 /* The default version of sym_fns.sym_segments for readers that don't
 436    do anything special.  */
 437
 438 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 439
 440 /* The default version of sym_fns.sym_relocate for readers that don't
 441    do anything special.  */
 442
 443 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 444                                            asection *sectp, bfd_byte *buf);
 445
 446 extern struct symtab *allocate_symtab (const char *, struct objfile *)
 447   ATTRIBUTE_NONNULL (1);
 448
 449 extern void add_symtab_fns (const struct sym_fns *);
 450
 451 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 452    syms_from_objfile, symbol_file_add, etc.  */
 453
 454 enum symfile_add_flags
 455   {
 456     /* Be chatty about what you are doing.  */
 457     SYMFILE_VERBOSE = 1 << 1,
 458
 459     /* This is the main symbol file (as opposed to symbol file for dynamically
 460        loaded code).  */
 461     SYMFILE_MAINLINE = 1 << 2,
 462
 463     /* Do not call breakpoint_re_set when adding this symbol file.  */
 464     SYMFILE_DEFER_BP_RESET = 1 << 3,
 465
 466     /* Do not immediately read symbols for this file.  By default,
 467        symbols are read when the objfile is created.  */
 468     SYMFILE_NO_READ = 1 << 4
 469   };
 470
 471 extern void syms_from_objfile (struct objfile *,
 472                                struct section_addr_info *,
 473                                struct section_offsets *, int, int);
 474
 475 extern void new_symfile_objfile (struct objfile *, int);
 476
 477 extern struct objfile *symbol_file_add (char *, int,
 478                                         struct section_addr_info *, int);
 479
 480 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 481                                                  struct section_addr_info *,
 482                                                  int, struct objfile *parent);
 483
 484 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 485
 486 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 487
 488 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 489
 490 extern struct section_addr_info *alloc_section_addr_info (size_t
 491                                                           num_sections);
 492
 493 /* Build (allocate and populate) a section_addr_info struct from an
 494    existing section table.  */
 495
 496 extern struct section_addr_info
 497   *build_section_addr_info_from_section_table (const struct target_section
 498                                                *start,
 499                                                const struct target_section
 500                                                *end);
 501
 502 /* Free all memory allocated by
 503    build_section_addr_info_from_section_table.  */
 504
 505 extern void free_section_addr_info (struct section_addr_info *);
 506
 507
 508                         /*   Variables   */
 509
 510 /* If non-zero, shared library symbols will be added automatically
 511    when the inferior is created, new libraries are loaded, or when
 512    attaching to the inferior.  This is almost always what users will
 513    want to have happen; but for very large programs, the startup time
 514    will be excessive, and so if this is a problem, the user can clear
 515    this flag and then add the shared library symbols as needed.  Note
 516    that there is a potential for confusion, since if the shared
 517    library symbols are not loaded, commands like "info fun" will *not*
 518    report all the functions that are actually present.  */
 519
 520 extern int auto_solib_add;
 521
 522 /* From symfile.c */
 523
 524 extern void set_initial_language (void);
 525
 526 extern void find_lowest_section (bfd *, asection *, void *);
 527
 528 extern bfd *symfile_bfd_open (char *);
 529
 530 extern bfd *gdb_bfd_open_maybe_remote (const char *);
 531
 532 extern int get_section_index (struct objfile *, char *);
 533
 534 /* Utility functions for overlay sections: */
 535 extern enum overlay_debugging_state
 536 {
 537   ovly_off,
 538   ovly_on,
 539   ovly_auto
 540 } overlay_debugging;
 541 extern int overlay_cache_invalid;
 542
 543 /* Return the "mapped" overlay section containing the PC.  */
 544 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 545
 546 /* Return any overlay section containing the PC (even in its LMA
 547    region).  */
 548 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 549
 550 /* Return true if the section is an overlay.  */
 551 extern int section_is_overlay (struct obj_section *);
 552
 553 /* Return true if the overlay section is currently "mapped".  */
 554 extern int section_is_mapped (struct obj_section *);
 555
 556 /* Return true if pc belongs to section's VMA.  */
 557 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 558
 559 /* Return true if pc belongs to section's LMA.  */
 560 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 561
 562 /* Map an address from a section's LMA to its VMA.  */
 563 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 564
 565 /* Map an address from a section's VMA to its LMA.  */
 566 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 567
 568 /* Convert an address in an overlay section (force into VMA range).  */
 569 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 570
 571 /* Load symbols from a file.  */
 572 extern void symbol_file_add_main (char *args, int from_tty);
 573
 574 /* Clear GDB symbol tables.  */
 575 extern void symbol_file_clear (int from_tty);
 576
 577 /* Default overlay update function.  */
 578 extern void simple_overlay_update (struct obj_section *);
 579
 580 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 581                                                  bfd_byte *);
 582
 583 extern int symfile_map_offsets_to_segments (bfd *,
 584                                             struct symfile_segment_data *,
 585                                             struct section_offsets *,
 586                                             int, const CORE_ADDR *);
 587 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 588 void free_symfile_segment_data (struct symfile_segment_data *data);
 589
 590 extern struct cleanup *increment_reading_symtab (void);
 591
 592 /* From dwarf2read.c */
 593
 594 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 595    section name (usually from the DWARF standard), while the field COMPRESSED
 596    is the name of compressed sections.  If your object file format doesn't
 597    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 598    the debugging section is not supported, the field NORMAL can be NULL too.
 599    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 600    field.  */
 601
 602 struct dwarf2_section_names {
 603   const char *normal;
 604   const char *compressed;
 605 };
 606
 607 /* List of names for dward2 debugging sections.  Also most object file formats
 608    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 609    due to restrictions.
 610    The table for the standard names is defined in dwarf2read.c.  Please
 611    update all instances of dwarf2_debug_sections if you add a field to this
 612    structure.  It is always safe to use { NULL, NULL } in this case.  */
 613
 614 struct dwarf2_debug_sections {
 615   struct dwarf2_section_names info;
 616   struct dwarf2_section_names abbrev;
 617   struct dwarf2_section_names line;
 618   struct dwarf2_section_names loc;
 619   struct dwarf2_section_names macinfo;
 620   struct dwarf2_section_names macro;
 621   struct dwarf2_section_names str;
 622   struct dwarf2_section_names ranges;
 623   struct dwarf2_section_names types;
 624   struct dwarf2_section_names addr;
 625   struct dwarf2_section_names frame;
 626   struct dwarf2_section_names eh_frame;
 627   struct dwarf2_section_names gdb_index;
 628   /* This field has no meaning, but exists solely to catch changes to
 629      this structure which are not reflected in some instance.  */
 630   int sentinel;
 631 };
 632
 633 extern int dwarf2_has_info (struct objfile *,
 634                             const struct dwarf2_debug_sections *);
 635
 636 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 637 enum dwarf2_section_enum {
 638   DWARF2_DEBUG_FRAME,
 639   DWARF2_EH_FRAME
 640 };
 641
 642 extern void dwarf2_get_section_info (struct objfile *,
 643                                      enum dwarf2_section_enum,
 644                                      asection **, gdb_byte **,
 645                                      bfd_size_type *);
 646
 647 extern int dwarf2_initialize_objfile (struct objfile *);
 648 extern void dwarf2_build_psymtabs (struct objfile *);
 649 extern void dwarf2_build_frame_info (struct objfile *);
 650
 651 void dwarf2_free_objfile (struct objfile *);
 652
 653 /* From mdebugread.c */
 654
 655 extern void mdebug_build_psymtabs (struct objfile *,
 656                                    const struct ecoff_debug_swap *,
 657                                    struct ecoff_debug_info *);
 658
 659 extern void elfmdebug_build_psymtabs (struct objfile *,
 660                                       const struct ecoff_debug_swap *,
 661                                       asection *);
 662
 663 /* From minidebug.c.  */
 664
 665 extern bfd *find_separate_debug_file_in_section (struct objfile *);
 666
 667 #endif /* !defined(SYMFILE_H) */