gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   4    2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
   5    Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #if !defined (SYMFILE_H)
  23 #define SYMFILE_H
  24
  25 /* This file requires that you first include "bfd.h".  */
  26 #include "symtab.h"
  27
  28 /* Opaque declarations.  */
  29 struct target_section;
  30 struct objfile;
  31 struct obj_section;
  32 struct obstack;
  33 struct block;
  34
  35 /* Comparison function for symbol look ups.  */
  36
  37 typedef int (symbol_compare_ftype) (const char *string1,
  38                                     const char *string2);
  39
  40 /* Partial symbols are stored in the psymbol_cache and pointers to
  41    them are kept in a dynamically grown array that is obtained from
  42    malloc and grown as necessary via realloc.  Each objfile typically
  43    has two of these, one for global symbols and one for static
  44    symbols.  Although this adds a level of indirection for storing or
  45    accessing the partial symbols, it allows us to throw away duplicate
  46    psymbols and set all pointers to the single saved instance.  */
  47
  48 struct psymbol_allocation_list
  49 {
  50
  51   /* Pointer to beginning of dynamically allocated array of pointers
  52      to partial symbols.  The array is dynamically expanded as
  53      necessary to accommodate more pointers.  */
  54
  55   struct partial_symbol **list;
  56
  57   /* Pointer to next available slot in which to store a pointer to a
  58      partial symbol.  */
  59
  60   struct partial_symbol **next;
  61
  62   /* Number of allocated pointer slots in current dynamic array (not
  63      the number of bytes of storage).  The "next" pointer will always
  64      point somewhere between list[0] and list[size], and when at
  65      list[size] the array will be expanded on the next attempt to
  66      store a pointer.  */
  67
  68   int size;
  69 };
  70
  71 /* Define an array of addresses to accommodate non-contiguous dynamic
  72    loading of modules.  This is for use when entering commands, so we
  73    can keep track of the section names until we read the file and can
  74    map them to bfd sections.  This structure is also used by solib.c
  75    to communicate the section addresses in shared objects to
  76    symbol_file_add ().  */
  77
  78 struct section_addr_info
  79 {
  80   /* The number of sections for which address information is
  81      available.  */
  82   size_t num_sections;
  83   /* Sections whose names are file format dependent.  */
  84   struct other_sections
  85   {
  86     CORE_ADDR addr;
  87     char *name;
  88
  89     /* SECTINDEX must be valid for associated BFD or set to -1.  */
  90     int sectindex;
  91   } other[1];
  92 };
  93
  94
  95 /* A table listing the load segments in a symfile, and which segment
  96    each BFD section belongs to.  */
  97 struct symfile_segment_data
  98 {
  99   /* How many segments are present in this file.  If there are
 100      two, the text segment is the first one and the data segment
 101      is the second one.  */
 102   int num_segments;
 103
 104   /* If NUM_SEGMENTS is greater than zero, the original base address
 105      of each segment.  */
 106   CORE_ADDR *segment_bases;
 107
 108   /* If NUM_SEGMENTS is greater than zero, the memory size of each
 109      segment.  */
 110   CORE_ADDR *segment_sizes;
 111
 112   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
 113      recording which segment contains each BFD section.
 114      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
 115      S, or zero if it is not in any segment.  */
 116   int *segment_info;
 117 };
 118
 119 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
 120
 121 typedef void (symbol_filename_ftype) (const char *filename,
 122                                       const char *fullname, void *data);
 123
 124 /* The "quick" symbol functions exist so that symbol readers can
 125    avoiding an initial read of all the symbols.  For example, symbol
 126    readers might choose to use the "partial symbol table" utilities,
 127    which is one implementation of the quick symbol functions.
 128
 129    The quick symbol functions are generally opaque: the underlying
 130    representation is hidden from the caller.
 131
 132    In general, these functions should only look at whatever special
 133    index the symbol reader creates -- looking through the symbol
 134    tables themselves is handled by generic code.  If a function is
 135    defined as returning a "symbol table", this means that the function
 136    should only return a newly-created symbol table; it should not
 137    examine pre-existing ones.
 138
 139    The exact list of functions here was determined in an ad hoc way
 140    based on gdb's history.  */
 141
 142 struct quick_symbol_functions
 143 {
 144   /* Return true if this objfile has any "partial" symbols
 145      available.  */
 146   int (*has_symbols) (struct objfile *objfile);
 147
 148   /* Return the symbol table for the "last" file appearing in
 149      OBJFILE.  */
 150   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 151
 152   /* Forget all cached full file names for OBJFILE.  */
 153   void (*forget_cached_source_info) (struct objfile *objfile);
 154
 155   /* Expand and iterate over each "partial" symbol table in OBJFILE
 156      where the source file is named NAME.
 157
 158      If there is no '/' in the name, a match after a '/' in the symbol
 159      table's file name will also work.  FULL_PATH is the absolute file
 160      name, and REAL_PATH is the same, run through gdb_realpath.
 161
 162      If a match is found, the "partial" symbol table is expanded.
 163      Then, this calls iterate_over_some_symtabs (or equivalent) over
 164      all newly-created symbol tables, passing CALLBACK and DATA to it.
 165      The result of this call is returned.  */
 166   int (*map_symtabs_matching_filename) (struct objfile *objfile,
 167                                         const char *name,
 168                                         const char *full_path,
 169                                         const char *real_path,
 170                                         int (*callback) (struct symtab *,
 171                                                          void *),
 172                                         void *data);
 173
 174   /* Check to see if the symbol is defined in a "partial" symbol table
 175      of OBJFILE.  KIND should be either GLOBAL_BLOCK or STATIC_BLOCK,
 176      depending on whether we want to search global symbols or static
 177      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 178      indicates what sort of symbol to search for.
 179
 180      Returns the newly-expanded symbol table in which the symbol is
 181      defined, or NULL if no such symbol table exists.  */
 182   struct symtab *(*lookup_symbol) (struct objfile *objfile,
 183                                    int kind, const char *name,
 184                                    domain_enum domain);
 185
 186   /* This is called to expand symbol tables before looking up a
 187      symbol.  A backend can choose to implement this and then have its
 188      `lookup_symbol' hook always return NULL, or the reverse.  (It
 189      doesn't make sense to implement both.)  The arguments are as for
 190      `lookup_symbol'.  */
 191   void (*pre_expand_symtabs_matching) (struct objfile *objfile,
 192                                        enum block_enum block_kind,
 193                                        const char *name,
 194                                        domain_enum domain);
 195
 196   /* Print statistics about any indices loaded for OBJFILE.  The
 197      statistics should be printed to gdb_stdout.  This is used for
 198      "maint print statistics".  */
 199   void (*print_stats) (struct objfile *objfile);
 200
 201   /* Dump any indices loaded for OBJFILE.  The dump should go to
 202      gdb_stdout.  This is used for "maint print objfiles".  */
 203   void (*dump) (struct objfile *objfile);
 204
 205   /* This is called by objfile_relocate to relocate any indices loaded
 206      for OBJFILE.  */
 207   void (*relocate) (struct objfile *objfile,
 208                     struct section_offsets *new_offsets,
 209                     struct section_offsets *delta);
 210
 211   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 212      the corresponding symbol tables are loaded.  */
 213   void (*expand_symtabs_for_function) (struct objfile *objfile,
 214                                        const char *func_name);
 215
 216   /* Read all symbol tables associated with OBJFILE.  */
 217   void (*expand_all_symtabs) (struct objfile *objfile);
 218
 219   /* Read all symbol tables associated with OBJFILE which have the
 220      file name FILENAME.
 221      This is for the purposes of examining code only, e.g., expand_line_sal.
 222      The routine may ignore debug info that is known to not be useful with
 223      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 224   void (*expand_symtabs_with_filename) (struct objfile *objfile,
 225                                         const char *filename);
 226
 227   /* Return the file name of the file holding the global symbol in OBJFILE
 228      named NAME.  If no such symbol exists in OBJFILE, return NULL.  */
 229   const char *(*find_symbol_file) (struct objfile *objfile, const char *name);
 230
 231   /* Find global or static symbols in all tables that are in NAMESPACE
 232      and for which MATCH (symbol name, NAME) == 0, passing each to
 233      CALLBACK, reading in partial symbol tables as needed.  Look
 234      through global symbols if GLOBAL and otherwise static symbols.
 235      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 236      found.  After each block is processed, passes NULL to CALLBACK.
 237      MATCH must be weaker than strcmp_iw_ordered in the sense that
 238      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 239      if non-null, must be an ordering relation compatible with
 240      strcmp_iw_ordered in the sense that
 241             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 242      and
 243             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 244      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 245      CALLBACK returns 0 to indicate that the scan should continue, or
 246      non-zero to indicate that the scan should be terminated.  */
 247
 248   void (*map_matching_symbols) (const char *name, domain_enum namespace,
 249                                 struct objfile *, int global,
 250                                 int (*callback) (struct block *,
 251                                                  struct symbol *, void *),
 252                                 void *data,
 253                                 symbol_compare_ftype *match,
 254                                 symbol_compare_ftype *ordered_compare);
 255
 256   /* Expand all symbol tables in OBJFILE matching some criteria.
 257
 258      FILE_MATCHER is called for each file in OBJFILE.  The file name
 259      and the DATA argument are passed to it.  If it returns zero, this
 260      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 261
 262      Otherwise, if KIND does not match this symbol is skipped.
 263
 264      If even KIND matches, then NAME_MATCHER is called for each symbol
 265      defined in the file.  The current language, the symbol name and
 266      DATA are passed to NAME_MATCHER.  The symbol "search" name should
 267      be passed to NAME_MATCHER (see la_symbol_name_compare in struct
 268      language_defn for more details on this).
 269
 270      If NAME_MATCHER returns zero, then this symbol is skipped.
 271
 272      Otherwise, this symbol's symbol table is expanded.
 273
 274      DATA is user data that is passed unmodified to the callback
 275      functions.  */
 276   void (*expand_symtabs_matching)
 277     (struct objfile *objfile,
 278      int (*file_matcher) (const char *, void *),
 279      int (*name_matcher) (const struct language_defn *, const char *, void *),
 280      enum search_domain kind,
 281      void *data);
 282
 283   /* Return the symbol table from OBJFILE that contains PC and
 284      SECTION.  Return NULL if there is no such symbol table.  This
 285      should return the symbol table that contains a symbol whose
 286      address exactly matches PC, or, if there is no exact match, the
 287      symbol table that contains a symbol whose address is closest to
 288      PC.  */
 289   struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
 290                                          struct minimal_symbol *msymbol,
 291                                          CORE_ADDR pc,
 292                                          struct obj_section *section,
 293                                          int warn_if_readin);
 294
 295   /* Call a callback for every file defined in OBJFILE whose symtab is
 296      not already read in.  FUN is the callback.  It is passed the file's
 297      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 298      the DATA passed to this function.  */
 299   void (*map_symbol_filenames) (struct objfile *objfile,
 300                                 symbol_filename_ftype *fun, void *data,
 301                                 int need_fullname);
 302 };
 303
 304 /* Structure to keep track of symbol reading functions for various
 305    object file types.  */
 306
 307 struct sym_fns
 308 {
 309
 310   /* BFD flavour that we handle, or (as a special kludge, see
 311      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 312
 313   enum bfd_flavour sym_flavour;
 314
 315   /* Initializes anything that is global to the entire symbol table.
 316      It is called during symbol_file_add, when we begin debugging an
 317      entirely new program.  */
 318
 319   void (*sym_new_init) (struct objfile *);
 320
 321   /* Reads any initial information from a symbol file, and initializes
 322      the struct sym_fns SF in preparation for sym_read().  It is
 323      called every time we read a symbol file for any reason.  */
 324
 325   void (*sym_init) (struct objfile *);
 326
 327   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 328      (or possibly a symtab).  OBJFILE is the objfile struct for the
 329      file we are reading.  SYMFILE_FLAGS are the flags passed to
 330      symbol_file_add & co.  */
 331
 332   void (*sym_read) (struct objfile *, int);
 333
 334   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 335      gdb has to check other ways if this objfile has any symbols.  This may
 336      only be non-NULL if the objfile actually does have debuginfo available.
 337      */
 338
 339   void (*sym_read_psymbols) (struct objfile *);
 340
 341   /* Called when we are finished with an objfile.  Should do all
 342      cleanup that is specific to the object file format for the
 343      particular objfile.  */
 344
 345   void (*sym_finish) (struct objfile *);
 346
 347   /* This function produces a file-dependent section_offsets
 348      structure, allocated in the objfile's storage, and based on the
 349      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 350      backward compatibility with the higher levels of GDB.  It should
 351      probably be changed to a string, where NULL means the default,
 352      and others are parsed in a file dependent way.  */
 353
 354   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 355
 356   /* This function produces a format-independent description of
 357      the segments of ABFD.  Each segment is a unit of the file
 358      which may be relocated independently.  */
 359
 360   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 361
 362   /* This function should read the linetable from the objfile when
 363      the line table cannot be read while processing the debugging
 364      information.  */
 365
 366   void (*sym_read_linetable) (void);
 367
 368   /* Relocate the contents of a debug section SECTP.  The
 369      contents are stored in BUF if it is non-NULL, or returned in a
 370      malloc'd buffer otherwise.  */
 371
 372   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 373
 374   /* The "quick" (aka partial) symbol functions for this symbol
 375      reader.  */
 376   const struct quick_symbol_functions *qf;
 377 };
 378
 379 extern struct section_addr_info *
 380   build_section_addr_info_from_objfile (const struct objfile *objfile);
 381
 382 extern void relative_addr_info_to_section_offsets
 383   (struct section_offsets *section_offsets, int num_sections,
 384    struct section_addr_info *addrs);
 385
 386 extern void addr_info_make_relative (struct section_addr_info *addrs,
 387                                      bfd *abfd);
 388
 389 /* The default version of sym_fns.sym_offsets for readers that don't
 390    do anything special.  */
 391
 392 extern void default_symfile_offsets (struct objfile *objfile,
 393                                      struct section_addr_info *);
 394
 395 /* The default version of sym_fns.sym_segments for readers that don't
 396    do anything special.  */
 397
 398 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 399
 400 /* The default version of sym_fns.sym_relocate for readers that don't
 401    do anything special.  */
 402
 403 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 404                                            asection *sectp, bfd_byte *buf);
 405
 406 extern struct symtab *allocate_symtab (const char *, struct objfile *);
 407
 408 extern void add_symtab_fns (const struct sym_fns *);
 409
 410 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 411    syms_from_objfile, symbol_file_add, etc.  */
 412
 413 enum symfile_add_flags
 414   {
 415     /* Be chatty about what you are doing.  */
 416     SYMFILE_VERBOSE = 1 << 1,
 417
 418     /* This is the main symbol file (as opposed to symbol file for dynamically
 419        loaded code).  */
 420     SYMFILE_MAINLINE = 1 << 2,
 421
 422     /* Do not call breakpoint_re_set when adding this symbol file.  */
 423     SYMFILE_DEFER_BP_RESET = 1 << 3,
 424
 425     /* Do not immediately read symbols for this file.  By default,
 426        symbols are read when the objfile is created.  */
 427     SYMFILE_NO_READ = 1 << 4
 428   };
 429
 430 extern void syms_from_objfile (struct objfile *,
 431                                struct section_addr_info *,
 432                                struct section_offsets *, int, int);
 433
 434 extern void new_symfile_objfile (struct objfile *, int);
 435
 436 extern struct objfile *symbol_file_add (char *, int,
 437                                         struct section_addr_info *, int);
 438
 439 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 440                                                  struct section_addr_info *,
 441                                                  int, struct objfile *parent);
 442
 443 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 444
 445 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 446
 447 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 448
 449 extern struct section_addr_info *alloc_section_addr_info (size_t
 450                                                           num_sections);
 451
 452 /* Build (allocate and populate) a section_addr_info struct from an
 453    existing section table.  */
 454
 455 extern struct section_addr_info
 456   *build_section_addr_info_from_section_table (const struct target_section
 457                                                *start,
 458                                                const struct target_section
 459                                                *end);
 460
 461 /* Free all memory allocated by
 462    build_section_addr_info_from_section_table.  */
 463
 464 extern void free_section_addr_info (struct section_addr_info *);
 465
 466
 467 /* Make a copy of the string at PTR with SIZE characters in the symbol
 468    obstack (and add a null character at the end in the copy).  Returns
 469    the address of the copy.  */
 470
 471 extern char *obsavestring (const char *, int, struct obstack *);
 472
 473 /* Concatenate NULL terminated variable argument list of `const char
 474    *' strings; return the new string.  Space is found in the OBSTACKP.
 475    Argument list must be terminated by a sentinel expression `(char *)
 476    NULL'.  */
 477
 478 extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
 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 (char *);
 501
 502 extern bfd *bfd_open_maybe_remote (const char *);
 503
 504 extern int get_section_index (struct objfile *, char *);
 505
 506 /* Utility functions for overlay sections: */
 507 extern enum overlay_debugging_state
 508 {
 509   ovly_off,
 510   ovly_on,
 511   ovly_auto
 512 } overlay_debugging;
 513 extern int overlay_cache_invalid;
 514
 515 /* Return the "mapped" overlay section containing the PC.  */
 516 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 517
 518 /* Return any overlay section containing the PC (even in its LMA
 519    region).  */
 520 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 521
 522 /* Return true if the section is an overlay.  */
 523 extern int section_is_overlay (struct obj_section *);
 524
 525 /* Return true if the overlay section is currently "mapped".  */
 526 extern int section_is_mapped (struct obj_section *);
 527
 528 /* Return true if pc belongs to section's VMA.  */
 529 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 530
 531 /* Return true if pc belongs to section's LMA.  */
 532 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 533
 534 /* Map an address from a section's LMA to its VMA.  */
 535 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 536
 537 /* Map an address from a section's VMA to its LMA.  */
 538 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 539
 540 /* Convert an address in an overlay section (force into VMA range).  */
 541 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 542
 543 /* Load symbols from a file.  */
 544 extern void symbol_file_add_main (char *args, int from_tty);
 545
 546 /* Clear GDB symbol tables.  */
 547 extern void symbol_file_clear (int from_tty);
 548
 549 /* Default overlay update function.  */
 550 extern void simple_overlay_update (struct obj_section *);
 551
 552 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 553                                                  bfd_byte *);
 554
 555 extern int symfile_map_offsets_to_segments (bfd *,
 556                                             struct symfile_segment_data *,
 557                                             struct section_offsets *,
 558                                             int, const CORE_ADDR *);
 559 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 560 void free_symfile_segment_data (struct symfile_segment_data *data);
 561
 562 extern struct cleanup *increment_reading_symtab (void);
 563
 564 /* From dwarf2read.c */
 565
 566 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 567    section name (usually from the DWARF standard), while the field COMPRESSED
 568    is the name of compressed sections.  If your object file format doesn't
 569    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 570    the debugging section is not supported, the field NORMAL can be NULL too.
 571    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 572    field.  */
 573
 574 struct dwarf2_section_names {
 575   const char *normal;
 576   const char *compressed;
 577 };
 578
 579 /* List of names for dward2 debugging sections.  Also most object file formats
 580    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 581    due to restrictions.
 582    The table for the standard names is defined in dwarf2read.c.  Please
 583    update all instances of dwarf2_debug_sections if you add a field to this
 584    structure.  It is always safe to use { NULL, NULL } in this case.  */
 585
 586 struct dwarf2_debug_sections {
 587   struct dwarf2_section_names info;
 588   struct dwarf2_section_names abbrev;
 589   struct dwarf2_section_names line;
 590   struct dwarf2_section_names loc;
 591   struct dwarf2_section_names macinfo;
 592   struct dwarf2_section_names macro;
 593   struct dwarf2_section_names str;
 594   struct dwarf2_section_names ranges;
 595   struct dwarf2_section_names types;
 596   struct dwarf2_section_names frame;
 597   struct dwarf2_section_names eh_frame;
 598   struct dwarf2_section_names gdb_index;
 599   /* This field has no meaning, but exists solely to catch changes to
 600      this structure which are not reflected in some instance.  */
 601   int sentinel;
 602 };
 603
 604 extern int dwarf2_has_info (struct objfile *,
 605                             const struct dwarf2_debug_sections *);
 606
 607 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 608 enum dwarf2_section_enum {
 609   DWARF2_DEBUG_FRAME,
 610   DWARF2_EH_FRAME
 611 };
 612
 613 extern void dwarf2_get_section_info (struct objfile *,
 614                                      enum dwarf2_section_enum,
 615                                      asection **, gdb_byte **,
 616                                      bfd_size_type *);
 617
 618 extern int dwarf2_initialize_objfile (struct objfile *);
 619 extern void dwarf2_build_psymtabs (struct objfile *);
 620 extern void dwarf2_build_frame_info (struct objfile *);
 621
 622 void dwarf2_free_objfile (struct objfile *);
 623
 624 /* From mdebugread.c */
 625
 626 /* Hack to force structures to exist before use in parameter list.  */
 627 struct ecoff_debug_hack
 628 {
 629   struct ecoff_debug_swap *a;
 630   struct ecoff_debug_info *b;
 631 };
 632
 633 extern void mdebug_build_psymtabs (struct objfile *,
 634                                    const struct ecoff_debug_swap *,
 635                                    struct ecoff_debug_info *);
 636
 637 extern void elfmdebug_build_psymtabs (struct objfile *,
 638                                       const struct ecoff_debug_swap *,
 639                                       asection *);
 640
 641 #endif /* !defined(SYMFILE_H) */