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.  KIND 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 symbol table in which the symbol is
 197      defined, or NULL if no such symbol table exists.  If OBJFILE
 198      contains !TYPE_OPAQUE symbol prefer its symtab.  If it contains
 199      only TYPE_OPAQUE symbol(s), return at least that symtab.  */
 200   struct symtab *(*lookup_symbol) (struct objfile *objfile,
 201                                    int kind, 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 symbol table from OBJFILE that contains PC and
 289      SECTION.  Return NULL if there is no such symbol table.  This
 290      should return the symbol table that contains a symbol whose
 291      address exactly matches PC, or, if there is no exact match, the
 292      symbol table that contains a symbol whose address is closest to
 293      PC.  */
 294   struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
 295                                          struct bound_minimal_symbol msymbol,
 296                                          CORE_ADDR pc,
 297                                          struct obj_section *section,
 298                                          int warn_if_readin);
 299
 300   /* Call a callback for every file defined in OBJFILE whose symtab is
 301      not already read in.  FUN is the callback.  It is passed the file's
 302      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 303      the DATA passed to this function.  */
 304   void (*map_symbol_filenames) (struct objfile *objfile,
 305                                 symbol_filename_ftype *fun, void *data,
 306                                 int need_fullname);
 307 };
 308
 309 /* Structure of functions used for probe support.  If one of these functions
 310    is provided, all must be.  */
 311
 312 struct sym_probe_fns
 313 {
 314   /* If non-NULL, return an array of probe objects.
 315
 316      The returned value does not have to be freed and it has lifetime of the
 317      OBJFILE.  */
 318   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 319 };
 320
 321 /* Structure to keep track of symbol reading functions for various
 322    object file types.  */
 323
 324 struct sym_fns
 325 {
 326   /* Initializes anything that is global to the entire symbol table.
 327      It is called during symbol_file_add, when we begin debugging an
 328      entirely new program.  */
 329
 330   void (*sym_new_init) (struct objfile *);
 331
 332   /* Reads any initial information from a symbol file, and initializes
 333      the struct sym_fns SF in preparation for sym_read().  It is
 334      called every time we read a symbol file for any reason.  */
 335
 336   void (*sym_init) (struct objfile *);
 337
 338   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 339      (or possibly a symtab).  OBJFILE is the objfile struct for the
 340      file we are reading.  SYMFILE_FLAGS are the flags passed to
 341      symbol_file_add & co.  */
 342
 343   void (*sym_read) (struct objfile *, int);
 344
 345   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 346      gdb has to check other ways if this objfile has any symbols.  This may
 347      only be non-NULL if the objfile actually does have debuginfo available.
 348      */
 349
 350   void (*sym_read_psymbols) (struct objfile *);
 351
 352   /* Called when we are finished with an objfile.  Should do all
 353      cleanup that is specific to the object file format for the
 354      particular objfile.  */
 355
 356   void (*sym_finish) (struct objfile *);
 357
 358   /* This function produces a file-dependent section_offsets
 359      structure, allocated in the objfile's storage, and based on the
 360      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 361      backward compatibility with the higher levels of GDB.  It should
 362      probably be changed to a string, where NULL means the default,
 363      and others are parsed in a file dependent way.  */
 364
 365   void (*sym_offsets) (struct objfile *, const struct section_addr_info *);
 366
 367   /* This function produces a format-independent description of
 368      the segments of ABFD.  Each segment is a unit of the file
 369      which may be relocated independently.  */
 370
 371   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 372
 373   /* This function should read the linetable from the objfile when
 374      the line table cannot be read while processing the debugging
 375      information.  */
 376
 377   void (*sym_read_linetable) (struct objfile *);
 378
 379   /* Relocate the contents of a debug section SECTP.  The
 380      contents are stored in BUF if it is non-NULL, or returned in a
 381      malloc'd buffer otherwise.  */
 382
 383   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 384
 385   /* If non-NULL, this objfile has probe support, and all the probe
 386      functions referred to here will be non-NULL.  */
 387   const struct sym_probe_fns *sym_probe_fns;
 388
 389   /* The "quick" (aka partial) symbol functions for this symbol
 390      reader.  */
 391   const struct quick_symbol_functions *qf;
 392 };
 393
 394 extern struct section_addr_info *
 395   build_section_addr_info_from_objfile (const struct objfile *objfile);
 396
 397 extern void relative_addr_info_to_section_offsets
 398   (struct section_offsets *section_offsets, int num_sections,
 399    const struct section_addr_info *addrs);
 400
 401 extern void addr_info_make_relative (struct section_addr_info *addrs,
 402                                      bfd *abfd);
 403
 404 /* The default version of sym_fns.sym_offsets for readers that don't
 405    do anything special.  */
 406
 407 extern void default_symfile_offsets (struct objfile *objfile,
 408                                      const struct section_addr_info *);
 409
 410 /* The default version of sym_fns.sym_segments for readers that don't
 411    do anything special.  */
 412
 413 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 414
 415 /* The default version of sym_fns.sym_relocate for readers that don't
 416    do anything special.  */
 417
 418 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 419                                            asection *sectp, bfd_byte *buf);
 420
 421 extern struct symtab *allocate_symtab (const char *, struct objfile *)
 422   ATTRIBUTE_NONNULL (1);
 423
 424 extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
 425
 426 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 427    symbol_file_add, etc.  */
 428
 429 enum symfile_add_flags
 430   {
 431     /* Be chatty about what you are doing.  */
 432     SYMFILE_VERBOSE = 1 << 1,
 433
 434     /* This is the main symbol file (as opposed to symbol file for dynamically
 435        loaded code).  */
 436     SYMFILE_MAINLINE = 1 << 2,
 437
 438     /* Do not call breakpoint_re_set when adding this symbol file.  */
 439     SYMFILE_DEFER_BP_RESET = 1 << 3,
 440
 441     /* Do not immediately read symbols for this file.  By default,
 442        symbols are read when the objfile is created.  */
 443     SYMFILE_NO_READ = 1 << 4
 444   };
 445
 446 extern void new_symfile_objfile (struct objfile *, int);
 447
 448 extern struct objfile *symbol_file_add (const char *, int,
 449                                         struct section_addr_info *, int);
 450
 451 extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, int,
 452                                                  struct section_addr_info *,
 453                                                  int, struct objfile *parent);
 454
 455 extern void symbol_file_add_separate (bfd *, const char *, int,
 456                                       struct objfile *);
 457
 458 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 459
 460 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 461
 462 extern struct section_addr_info *alloc_section_addr_info (size_t
 463                                                           num_sections);
 464
 465 /* Build (allocate and populate) a section_addr_info struct from an
 466    existing section table.  */
 467
 468 extern struct section_addr_info
 469   *build_section_addr_info_from_section_table (const struct target_section
 470                                                *start,
 471                                                const struct target_section
 472                                                *end);
 473
 474 /* Free all memory allocated by
 475    build_section_addr_info_from_section_table.  */
 476
 477 extern void free_section_addr_info (struct section_addr_info *);
 478
 479
 480                         /*   Variables   */
 481
 482 /* If non-zero, shared library symbols will be added automatically
 483    when the inferior is created, new libraries are loaded, or when
 484    attaching to the inferior.  This is almost always what users will
 485    want to have happen; but for very large programs, the startup time
 486    will be excessive, and so if this is a problem, the user can clear
 487    this flag and then add the shared library symbols as needed.  Note
 488    that there is a potential for confusion, since if the shared
 489    library symbols are not loaded, commands like "info fun" will *not*
 490    report all the functions that are actually present.  */
 491
 492 extern int auto_solib_add;
 493
 494 /* From symfile.c */
 495
 496 extern void set_initial_language (void);
 497
 498 extern void find_lowest_section (bfd *, asection *, void *);
 499
 500 extern bfd *symfile_bfd_open (const char *);
 501
 502 extern bfd *gdb_bfd_open_maybe_remote (const char *);
 503
 504 extern int get_section_index (struct objfile *, char *);
 505
 506 extern int print_symbol_loading_p (int from_tty, int mainline, int full);
 507
 508 /* Utility functions for overlay sections: */
 509 extern enum overlay_debugging_state
 510 {
 511   ovly_off,
 512   ovly_on,
 513   ovly_auto
 514 } overlay_debugging;
 515 extern int overlay_cache_invalid;
 516
 517 /* Return the "mapped" overlay section containing the PC.  */
 518 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 519
 520 /* Return any overlay section containing the PC (even in its LMA
 521    region).  */
 522 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 523
 524 /* Return true if the section is an overlay.  */
 525 extern int section_is_overlay (struct obj_section *);
 526
 527 /* Return true if the overlay section is currently "mapped".  */
 528 extern int section_is_mapped (struct obj_section *);
 529
 530 /* Return true if pc belongs to section's VMA.  */
 531 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 532
 533 /* Return true if pc belongs to section's LMA.  */
 534 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 535
 536 /* Map an address from a section's LMA to its VMA.  */
 537 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 538
 539 /* Map an address from a section's VMA to its LMA.  */
 540 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 541
 542 /* Convert an address in an overlay section (force into VMA range).  */
 543 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 544
 545 /* Load symbols from a file.  */
 546 extern void symbol_file_add_main (const char *args, int from_tty);
 547
 548 /* Clear GDB symbol tables.  */
 549 extern void symbol_file_clear (int from_tty);
 550
 551 /* Default overlay update function.  */
 552 extern void simple_overlay_update (struct obj_section *);
 553
 554 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 555                                                  bfd_byte *);
 556
 557 extern int symfile_map_offsets_to_segments (bfd *,
 558                                             const struct symfile_segment_data *,
 559                                             struct section_offsets *,
 560                                             int, const CORE_ADDR *);
 561 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 562 void free_symfile_segment_data (struct symfile_segment_data *data);
 563
 564 extern struct cleanup *increment_reading_symtab (void);
 565
 566 void expand_symtabs_matching (expand_symtabs_file_matcher_ftype *,
 567                               expand_symtabs_symbol_matcher_ftype *,
 568                               enum search_domain kind, void *data);
 569
 570 void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 571                            int need_fullname);
 572
 573 /* From dwarf2read.c */
 574
 575 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 576    section name (usually from the DWARF standard), while the field COMPRESSED
 577    is the name of compressed sections.  If your object file format doesn't
 578    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 579    the debugging section is not supported, the field NORMAL can be NULL too.
 580    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 581    field.  */
 582
 583 struct dwarf2_section_names {
 584   const char *normal;
 585   const char *compressed;
 586 };
 587
 588 /* List of names for dward2 debugging sections.  Also most object file formats
 589    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 590    due to restrictions.
 591    The table for the standard names is defined in dwarf2read.c.  Please
 592    update all instances of dwarf2_debug_sections if you add a field to this
 593    structure.  It is always safe to use { NULL, NULL } in this case.  */
 594
 595 struct dwarf2_debug_sections {
 596   struct dwarf2_section_names info;
 597   struct dwarf2_section_names abbrev;
 598   struct dwarf2_section_names line;
 599   struct dwarf2_section_names loc;
 600   struct dwarf2_section_names macinfo;
 601   struct dwarf2_section_names macro;
 602   struct dwarf2_section_names str;
 603   struct dwarf2_section_names ranges;
 604   struct dwarf2_section_names types;
 605   struct dwarf2_section_names addr;
 606   struct dwarf2_section_names frame;
 607   struct dwarf2_section_names eh_frame;
 608   struct dwarf2_section_names gdb_index;
 609   /* This field has no meaning, but exists solely to catch changes to
 610      this structure which are not reflected in some instance.  */
 611   int sentinel;
 612 };
 613
 614 extern int dwarf2_has_info (struct objfile *,
 615                             const struct dwarf2_debug_sections *);
 616
 617 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 618 enum dwarf2_section_enum {
 619   DWARF2_DEBUG_FRAME,
 620   DWARF2_EH_FRAME
 621 };
 622
 623 extern void dwarf2_get_section_info (struct objfile *,
 624                                      enum dwarf2_section_enum,
 625                                      asection **, const gdb_byte **,
 626                                      bfd_size_type *);
 627
 628 extern int dwarf2_initialize_objfile (struct objfile *);
 629 extern void dwarf2_build_psymtabs (struct objfile *);
 630 extern void dwarf2_build_frame_info (struct objfile *);
 631
 632 void dwarf2_free_objfile (struct objfile *);
 633
 634 /* From mdebugread.c */
 635
 636 extern void mdebug_build_psymtabs (struct objfile *,
 637                                    const struct ecoff_debug_swap *,
 638                                    struct ecoff_debug_info *);
 639
 640 extern void elfmdebug_build_psymtabs (struct objfile *,
 641                                       const struct ecoff_debug_swap *,
 642                                       asection *);
 643
 644 /* From minidebug.c.  */
 645
 646 extern bfd *find_separate_debug_file_in_section (struct objfile *);
 647
 648 #endif /* !defined(SYMFILE_H) */