gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2004, 2007-2012 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
  26 /* Opaque declarations.  */
  27 struct target_section;
  28 struct objfile;
  29 struct obj_section;
  30 struct obstack;
  31 struct block;
  32
  33 /* Comparison function for symbol look ups.  */
  34
  35 typedef int (symbol_compare_ftype) (const char *string1,
  36                                     const char *string2);
  37
  38 /* Partial symbols are stored in the psymbol_cache and pointers to
  39    them are kept in a dynamically grown array that is obtained from
  40    malloc and grown as necessary via realloc.  Each objfile typically
  41    has two of these, one for global symbols and one for static
  42    symbols.  Although this adds a level of indirection for storing or
  43    accessing the partial symbols, it allows us to throw away duplicate
  44    psymbols and set all pointers to the single saved instance.  */
  45
  46 struct psymbol_allocation_list
  47 {
  48
  49   /* Pointer to beginning of dynamically allocated array of pointers
  50      to partial symbols.  The array is dynamically expanded as
  51      necessary to accommodate more pointers.  */
  52
  53   struct partial_symbol **list;
  54
  55   /* Pointer to next available slot in which to store a pointer to a
  56      partial symbol.  */
  57
  58   struct partial_symbol **next;
  59
  60   /* Number of allocated pointer slots in current dynamic array (not
  61      the number of bytes of storage).  The "next" pointer will always
  62      point somewhere between list[0] and list[size], and when at
  63      list[size] the array will be expanded on the next attempt to
  64      store a pointer.  */
  65
  66   int size;
  67 };
  68
  69 /* Define an array of addresses to accommodate non-contiguous dynamic
  70    loading of modules.  This is for use when entering commands, so we
  71    can keep track of the section names until we read the file and can
  72    map them to bfd sections.  This structure is also used by solib.c
  73    to communicate the section addresses in shared objects to
  74    symbol_file_add ().  */
  75
  76 struct section_addr_info
  77 {
  78   /* The number of sections for which address information is
  79      available.  */
  80   size_t num_sections;
  81   /* Sections whose names are file format dependent.  */
  82   struct other_sections
  83   {
  84     CORE_ADDR addr;
  85     char *name;
  86
  87     /* SECTINDEX must be valid for associated BFD or set to -1.  */
  88     int sectindex;
  89   } other[1];
  90 };
  91
  92
  93 /* A table listing the load segments in a symfile, and which segment
  94    each BFD section belongs to.  */
  95 struct symfile_segment_data
  96 {
  97   /* How many segments are present in this file.  If there are
  98      two, the text segment is the first one and the data segment
  99      is the second one.  */
 100   int num_segments;
 101
 102   /* If NUM_SEGMENTS is greater than zero, the original base address
 103      of each segment.  */
 104   CORE_ADDR *segment_bases;
 105
 106   /* If NUM_SEGMENTS is greater than zero, the memory size of each
 107      segment.  */
 108   CORE_ADDR *segment_sizes;
 109
 110   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
 111      recording which segment contains each BFD section.
 112      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
 113      S, or zero if it is not in any segment.  */
 114   int *segment_info;
 115 };
 116
 117 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
 118
 119 typedef void (symbol_filename_ftype) (const char *filename,
 120                                       const char *fullname, void *data);
 121
 122 /* The "quick" symbol functions exist so that symbol readers can
 123    avoiding an initial read of all the symbols.  For example, symbol
 124    readers might choose to use the "partial symbol table" utilities,
 125    which is one implementation of the quick symbol functions.
 126
 127    The quick symbol functions are generally opaque: the underlying
 128    representation is hidden from the caller.
 129
 130    In general, these functions should only look at whatever special
 131    index the symbol reader creates -- looking through the symbol
 132    tables themselves is handled by generic code.  If a function is
 133    defined as returning a "symbol table", this means that the function
 134    should only return a newly-created symbol table; it should not
 135    examine pre-existing ones.
 136
 137    The exact list of functions here was determined in an ad hoc way
 138    based on gdb's history.  */
 139
 140 struct quick_symbol_functions
 141 {
 142   /* Return true if this objfile has any "partial" symbols
 143      available.  */
 144   int (*has_symbols) (struct objfile *objfile);
 145
 146   /* Return the symbol table for the "last" file appearing in
 147      OBJFILE.  */
 148   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 149
 150   /* Forget all cached full file names for OBJFILE.  */
 151   void (*forget_cached_source_info) (struct objfile *objfile);
 152
 153   /* Expand and iterate over each "partial" symbol table in OBJFILE
 154      where the source file is named NAME.
 155
 156      If there is no '/' in the name, a match after a '/' in the symbol
 157      table's file name will also work.  FULL_PATH is the absolute file
 158      name, and REAL_PATH is the same, run through gdb_realpath.
 159
 160      If a match is found, the "partial" symbol table is expanded.
 161      Then, this calls iterate_over_some_symtabs (or equivalent) over
 162      all newly-created symbol tables, passing CALLBACK and DATA to it.
 163      The result of this call is returned.  */
 164   int (*map_symtabs_matching_filename) (struct objfile *objfile,
 165                                         const char *name,
 166                                         const char *full_path,
 167                                         const char *real_path,
 168                                         int (*callback) (struct symtab *,
 169                                                          void *),
 170                                         void *data);
 171
 172   /* Check to see if the symbol is defined in a "partial" symbol table
 173      of OBJFILE.  KIND should be either GLOBAL_BLOCK or STATIC_BLOCK,
 174      depending on whether we want to search global symbols or static
 175      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 176      indicates what sort of symbol to search for.
 177
 178      Returns the newly-expanded symbol table in which the symbol is
 179      defined, or NULL if no such symbol table exists.  */
 180   struct symtab *(*lookup_symbol) (struct objfile *objfile,
 181                                    int kind, const char *name,
 182                                    domain_enum domain);
 183
 184   /* This is called to expand symbol tables before looking up a
 185      symbol.  A backend can choose to implement this and then have its
 186      `lookup_symbol' hook always return NULL, or the reverse.  (It
 187      doesn't make sense to implement both.)  The arguments are as for
 188      `lookup_symbol'.  */
 189   void (*pre_expand_symtabs_matching) (struct objfile *objfile,
 190                                        enum block_enum block_kind,
 191                                        const char *name,
 192                                        domain_enum domain);
 193
 194   /* Print statistics about any indices loaded for OBJFILE.  The
 195      statistics should be printed to gdb_stdout.  This is used for
 196      "maint print statistics".  */
 197   void (*print_stats) (struct objfile *objfile);
 198
 199   /* Dump any indices loaded for OBJFILE.  The dump should go to
 200      gdb_stdout.  This is used for "maint print objfiles".  */
 201   void (*dump) (struct objfile *objfile);
 202
 203   /* This is called by objfile_relocate to relocate any indices loaded
 204      for OBJFILE.  */
 205   void (*relocate) (struct objfile *objfile,
 206                     struct section_offsets *new_offsets,
 207                     struct section_offsets *delta);
 208
 209   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 210      the corresponding symbol tables are loaded.  */
 211   void (*expand_symtabs_for_function) (struct objfile *objfile,
 212                                        const char *func_name);
 213
 214   /* Read all symbol tables associated with OBJFILE.  */
 215   void (*expand_all_symtabs) (struct objfile *objfile);
 216
 217   /* Read all symbol tables associated with OBJFILE which have the
 218      file name FILENAME.
 219      This is for the purposes of examining code only, e.g., expand_line_sal.
 220      The routine may ignore debug info that is known to not be useful with
 221      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 222   void (*expand_symtabs_with_filename) (struct objfile *objfile,
 223                                         const char *filename);
 224
 225   /* Return the file name of the file holding the global symbol in OBJFILE
 226      named NAME.  If no such symbol exists in OBJFILE, return NULL.  */
 227   const char *(*find_symbol_file) (struct objfile *objfile, const char *name);
 228
 229   /* Find global or static symbols in all tables that are in NAMESPACE
 230      and for which MATCH (symbol name, NAME) == 0, passing each to
 231      CALLBACK, reading in partial symbol tables as needed.  Look
 232      through global symbols if GLOBAL and otherwise static symbols.
 233      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 234      found.  After each block is processed, passes NULL to CALLBACK.
 235      MATCH must be weaker than strcmp_iw_ordered in the sense that
 236      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 237      if non-null, must be an ordering relation compatible with
 238      strcmp_iw_ordered in the sense that
 239             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 240      and
 241             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 242      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 243      CALLBACK returns 0 to indicate that the scan should continue, or
 244      non-zero to indicate that the scan should be terminated.  */
 245
 246   void (*map_matching_symbols) (const char *name, domain_enum namespace,
 247                                 struct objfile *, int global,
 248                                 int (*callback) (struct block *,
 249                                                  struct symbol *, void *),
 250                                 void *data,
 251                                 symbol_compare_ftype *match,
 252                                 symbol_compare_ftype *ordered_compare);
 253
 254   /* Expand all symbol tables in OBJFILE matching some criteria.
 255
 256      FILE_MATCHER is called for each file in OBJFILE.  The file name
 257      and the DATA argument are passed to it.  If it returns zero, this
 258      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 259
 260      Otherwise, if KIND does not match this symbol is skipped.
 261
 262      If even KIND matches, then NAME_MATCHER is called for each symbol
 263      defined in the file.  The current language, the symbol name and
 264      DATA are passed to NAME_MATCHER.  The symbol "search" name should
 265      be passed to NAME_MATCHER (see la_symbol_name_compare in struct
 266      language_defn for more details on this).
 267
 268      If NAME_MATCHER returns zero, then this symbol is skipped.
 269
 270      Otherwise, this symbol's symbol table is expanded.
 271
 272      DATA is user data that is passed unmodified to the callback
 273      functions.  */
 274   void (*expand_symtabs_matching)
 275     (struct objfile *objfile,
 276      int (*file_matcher) (const char *, void *),
 277      int (*name_matcher) (const struct language_defn *, const char *, void *),
 278      enum search_domain kind,
 279      void *data);
 280
 281   /* Return the symbol table from OBJFILE that contains PC and
 282      SECTION.  Return NULL if there is no such symbol table.  This
 283      should return the symbol table that contains a symbol whose
 284      address exactly matches PC, or, if there is no exact match, the
 285      symbol table that contains a symbol whose address is closest to
 286      PC.  */
 287   struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
 288                                          struct minimal_symbol *msymbol,
 289                                          CORE_ADDR pc,
 290                                          struct obj_section *section,
 291                                          int warn_if_readin);
 292
 293   /* Call a callback for every file defined in OBJFILE whose symtab is
 294      not already read in.  FUN is the callback.  It is passed the file's
 295      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 296      the DATA passed to this function.  */
 297   void (*map_symbol_filenames) (struct objfile *objfile,
 298                                 symbol_filename_ftype *fun, void *data,
 299                                 int need_fullname);
 300 };
 301
 302 /* Structure to keep track of symbol reading functions for various
 303    object file types.  */
 304
 305 struct sym_fns
 306 {
 307
 308   /* BFD flavour that we handle, or (as a special kludge, see
 309      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 310
 311   enum bfd_flavour sym_flavour;
 312
 313   /* Initializes anything that is global to the entire symbol table.
 314      It is called during symbol_file_add, when we begin debugging an
 315      entirely new program.  */
 316
 317   void (*sym_new_init) (struct objfile *);
 318
 319   /* Reads any initial information from a symbol file, and initializes
 320      the struct sym_fns SF in preparation for sym_read().  It is
 321      called every time we read a symbol file for any reason.  */
 322
 323   void (*sym_init) (struct objfile *);
 324
 325   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 326      (or possibly a symtab).  OBJFILE is the objfile struct for the
 327      file we are reading.  SYMFILE_FLAGS are the flags passed to
 328      symbol_file_add & co.  */
 329
 330   void (*sym_read) (struct objfile *, int);
 331
 332   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 333      gdb has to check other ways if this objfile has any symbols.  This may
 334      only be non-NULL if the objfile actually does have debuginfo available.
 335      */
 336
 337   void (*sym_read_psymbols) (struct objfile *);
 338
 339   /* Called when we are finished with an objfile.  Should do all
 340      cleanup that is specific to the object file format for the
 341      particular objfile.  */
 342
 343   void (*sym_finish) (struct objfile *);
 344
 345   /* This function produces a file-dependent section_offsets
 346      structure, allocated in the objfile's storage, and based on the
 347      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 348      backward compatibility with the higher levels of GDB.  It should
 349      probably be changed to a string, where NULL means the default,
 350      and others are parsed in a file dependent way.  */
 351
 352   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 353
 354   /* This function produces a format-independent description of
 355      the segments of ABFD.  Each segment is a unit of the file
 356      which may be relocated independently.  */
 357
 358   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 359
 360   /* This function should read the linetable from the objfile when
 361      the line table cannot be read while processing the debugging
 362      information.  */
 363
 364   void (*sym_read_linetable) (void);
 365
 366   /* Relocate the contents of a debug section SECTP.  The
 367      contents are stored in BUF if it is non-NULL, or returned in a
 368      malloc'd buffer otherwise.  */
 369
 370   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 371
 372   /* The "quick" (aka partial) symbol functions for this symbol
 373      reader.  */
 374   const struct quick_symbol_functions *qf;
 375 };
 376
 377 extern struct section_addr_info *
 378   build_section_addr_info_from_objfile (const struct objfile *objfile);
 379
 380 extern void relative_addr_info_to_section_offsets
 381   (struct section_offsets *section_offsets, int num_sections,
 382    struct section_addr_info *addrs);
 383
 384 extern void addr_info_make_relative (struct section_addr_info *addrs,
 385                                      bfd *abfd);
 386
 387 /* The default version of sym_fns.sym_offsets for readers that don't
 388    do anything special.  */
 389
 390 extern void default_symfile_offsets (struct objfile *objfile,
 391                                      struct section_addr_info *);
 392
 393 /* The default version of sym_fns.sym_segments for readers that don't
 394    do anything special.  */
 395
 396 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 397
 398 /* The default version of sym_fns.sym_relocate for readers that don't
 399    do anything special.  */
 400
 401 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 402                                            asection *sectp, bfd_byte *buf);
 403
 404 extern struct symtab *allocate_symtab (const char *, struct objfile *);
 405
 406 extern void add_symtab_fns (const struct sym_fns *);
 407
 408 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 409    syms_from_objfile, symbol_file_add, etc.  */
 410
 411 enum symfile_add_flags
 412   {
 413     /* Be chatty about what you are doing.  */
 414     SYMFILE_VERBOSE = 1 << 1,
 415
 416     /* This is the main symbol file (as opposed to symbol file for dynamically
 417        loaded code).  */
 418     SYMFILE_MAINLINE = 1 << 2,
 419
 420     /* Do not call breakpoint_re_set when adding this symbol file.  */
 421     SYMFILE_DEFER_BP_RESET = 1 << 3,
 422
 423     /* Do not immediately read symbols for this file.  By default,
 424        symbols are read when the objfile is created.  */
 425     SYMFILE_NO_READ = 1 << 4
 426   };
 427
 428 extern void syms_from_objfile (struct objfile *,
 429                                struct section_addr_info *,
 430                                struct section_offsets *, int, int);
 431
 432 extern void new_symfile_objfile (struct objfile *, int);
 433
 434 extern struct objfile *symbol_file_add (char *, int,
 435                                         struct section_addr_info *, int);
 436
 437 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 438                                                  struct section_addr_info *,
 439                                                  int, struct objfile *parent);
 440
 441 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 442
 443 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 444
 445 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 446
 447 extern struct section_addr_info *alloc_section_addr_info (size_t
 448                                                           num_sections);
 449
 450 /* Build (allocate and populate) a section_addr_info struct from an
 451    existing section table.  */
 452
 453 extern struct section_addr_info
 454   *build_section_addr_info_from_section_table (const struct target_section
 455                                                *start,
 456                                                const struct target_section
 457                                                *end);
 458
 459 /* Free all memory allocated by
 460    build_section_addr_info_from_section_table.  */
 461
 462 extern void free_section_addr_info (struct section_addr_info *);
 463
 464
 465 /* Make a copy of the string at PTR with SIZE characters in the symbol
 466    obstack (and add a null character at the end in the copy).  Returns
 467    the address of the copy.  */
 468
 469 extern char *obsavestring (const char *, int, struct obstack *);
 470
 471 /* Concatenate NULL terminated variable argument list of `const char
 472    *' strings; return the new string.  Space is found in the OBSTACKP.
 473    Argument list must be terminated by a sentinel expression `(char *)
 474    NULL'.  */
 475
 476 extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
 477
 478                         /*   Variables   */
 479
 480 /* If non-zero, shared library symbols will be added automatically
 481    when the inferior is created, new libraries are loaded, or when
 482    attaching to the inferior.  This is almost always what users will
 483    want to have happen; but for very large programs, the startup time
 484    will be excessive, and so if this is a problem, the user can clear
 485    this flag and then add the shared library symbols as needed.  Note
 486    that there is a potential for confusion, since if the shared
 487    library symbols are not loaded, commands like "info fun" will *not*
 488    report all the functions that are actually present.  */
 489
 490 extern int auto_solib_add;
 491
 492 /* From symfile.c */
 493
 494 extern void set_initial_language (void);
 495
 496 extern void find_lowest_section (bfd *, asection *, void *);
 497
 498 extern bfd *symfile_bfd_open (char *);
 499
 500 extern bfd *bfd_open_maybe_remote (const char *);
 501
 502 extern int get_section_index (struct objfile *, char *);
 503
 504 /* Utility functions for overlay sections: */
 505 extern enum overlay_debugging_state
 506 {
 507   ovly_off,
 508   ovly_on,
 509   ovly_auto
 510 } overlay_debugging;
 511 extern int overlay_cache_invalid;
 512
 513 /* Return the "mapped" overlay section containing the PC.  */
 514 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 515
 516 /* Return any overlay section containing the PC (even in its LMA
 517    region).  */
 518 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 519
 520 /* Return true if the section is an overlay.  */
 521 extern int section_is_overlay (struct obj_section *);
 522
 523 /* Return true if the overlay section is currently "mapped".  */
 524 extern int section_is_mapped (struct obj_section *);
 525
 526 /* Return true if pc belongs to section's VMA.  */
 527 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 528
 529 /* Return true if pc belongs to section's LMA.  */
 530 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 531
 532 /* Map an address from a section's LMA to its VMA.  */
 533 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 534
 535 /* Map an address from a section's VMA to its LMA.  */
 536 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 537
 538 /* Convert an address in an overlay section (force into VMA range).  */
 539 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 540
 541 /* Load symbols from a file.  */
 542 extern void symbol_file_add_main (char *args, int from_tty);
 543
 544 /* Clear GDB symbol tables.  */
 545 extern void symbol_file_clear (int from_tty);
 546
 547 /* Default overlay update function.  */
 548 extern void simple_overlay_update (struct obj_section *);
 549
 550 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 551                                                  bfd_byte *);
 552
 553 extern int symfile_map_offsets_to_segments (bfd *,
 554                                             struct symfile_segment_data *,
 555                                             struct section_offsets *,
 556                                             int, const CORE_ADDR *);
 557 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 558 void free_symfile_segment_data (struct symfile_segment_data *data);
 559
 560 extern struct cleanup *increment_reading_symtab (void);
 561
 562 /* From dwarf2read.c */
 563
 564 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 565    section name (usually from the DWARF standard), while the field COMPRESSED
 566    is the name of compressed sections.  If your object file format doesn't
 567    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 568    the debugging section is not supported, the field NORMAL can be NULL too.
 569    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 570    field.  */
 571
 572 struct dwarf2_section_names {
 573   const char *normal;
 574   const char *compressed;
 575 };
 576
 577 /* List of names for dward2 debugging sections.  Also most object file formats
 578    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 579    due to restrictions.
 580    The table for the standard names is defined in dwarf2read.c.  Please
 581    update all instances of dwarf2_debug_sections if you add a field to this
 582    structure.  It is always safe to use { NULL, NULL } in this case.  */
 583
 584 struct dwarf2_debug_sections {
 585   struct dwarf2_section_names info;
 586   struct dwarf2_section_names abbrev;
 587   struct dwarf2_section_names line;
 588   struct dwarf2_section_names loc;
 589   struct dwarf2_section_names macinfo;
 590   struct dwarf2_section_names macro;
 591   struct dwarf2_section_names str;
 592   struct dwarf2_section_names ranges;
 593   struct dwarf2_section_names types;
 594   struct dwarf2_section_names frame;
 595   struct dwarf2_section_names eh_frame;
 596   struct dwarf2_section_names gdb_index;
 597   /* This field has no meaning, but exists solely to catch changes to
 598      this structure which are not reflected in some instance.  */
 599   int sentinel;
 600 };
 601
 602 extern int dwarf2_has_info (struct objfile *,
 603                             const struct dwarf2_debug_sections *);
 604
 605 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 606 enum dwarf2_section_enum {
 607   DWARF2_DEBUG_FRAME,
 608   DWARF2_EH_FRAME
 609 };
 610
 611 extern void dwarf2_get_section_info (struct objfile *,
 612                                      enum dwarf2_section_enum,
 613                                      asection **, gdb_byte **,
 614                                      bfd_size_type *);
 615
 616 extern int dwarf2_initialize_objfile (struct objfile *);
 617 extern void dwarf2_build_psymtabs (struct objfile *);
 618 extern void dwarf2_build_frame_info (struct objfile *);
 619
 620 void dwarf2_free_objfile (struct objfile *);
 621
 622 /* From mdebugread.c */
 623
 624 /* Hack to force structures to exist before use in parameter list.  */
 625 struct ecoff_debug_hack
 626 {
 627   struct ecoff_debug_swap *a;
 628   struct ecoff_debug_info *b;
 629 };
 630
 631 extern void mdebug_build_psymtabs (struct objfile *,
 632                                    const struct ecoff_debug_swap *,
 633                                    struct ecoff_debug_info *);
 634
 635 extern void elfmdebug_build_psymtabs (struct objfile *,
 636                                       const struct ecoff_debug_swap *,
 637                                       asection *);
 638
 639 #endif /* !defined(SYMFILE_H) */