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 #include "gdb_vecs.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.  FULL_PATH is the absolute file
 164      name, and REAL_PATH is the same, 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 *full_path,
 173                                         const char *real_path,
 174                                         int (*callback) (struct symtab *,
 175                                                          void *),
 176                                         void *data);
 177
 178   /* Check to see if the symbol is defined in a "partial" symbol table
 179      of OBJFILE.  KIND should be either GLOBAL_BLOCK or STATIC_BLOCK,
 180      depending on whether we want to search global symbols or static
 181      symbols.  NAME is the name of the symbol to look for.  DOMAIN
 182      indicates what sort of symbol to search for.
 183
 184      Returns the newly-expanded symbol table in which the symbol is
 185      defined, or NULL if no such symbol table exists.  */
 186   struct symtab *(*lookup_symbol) (struct objfile *objfile,
 187                                    int kind, const char *name,
 188                                    domain_enum domain);
 189
 190   /* This is called to expand symbol tables before looking up a
 191      symbol.  A backend can choose to implement this and then have its
 192      `lookup_symbol' hook always return NULL, or the reverse.  (It
 193      doesn't make sense to implement both.)  The arguments are as for
 194      `lookup_symbol'.  */
 195   void (*pre_expand_symtabs_matching) (struct objfile *objfile,
 196                                        enum block_enum block_kind,
 197                                        const char *name,
 198                                        domain_enum domain);
 199
 200   /* Print statistics about any indices loaded for OBJFILE.  The
 201      statistics should be printed to gdb_stdout.  This is used for
 202      "maint print statistics".  */
 203   void (*print_stats) (struct objfile *objfile);
 204
 205   /* Dump any indices loaded for OBJFILE.  The dump should go to
 206      gdb_stdout.  This is used for "maint print objfiles".  */
 207   void (*dump) (struct objfile *objfile);
 208
 209   /* This is called by objfile_relocate to relocate any indices loaded
 210      for OBJFILE.  */
 211   void (*relocate) (struct objfile *objfile,
 212                     struct section_offsets *new_offsets,
 213                     struct section_offsets *delta);
 214
 215   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 216      the corresponding symbol tables are loaded.  */
 217   void (*expand_symtabs_for_function) (struct objfile *objfile,
 218                                        const char *func_name);
 219
 220   /* Read all symbol tables associated with OBJFILE.  */
 221   void (*expand_all_symtabs) (struct objfile *objfile);
 222
 223   /* Read all symbol tables associated with OBJFILE which have the
 224      file name FILENAME.
 225      This is for the purposes of examining code only, e.g., expand_line_sal.
 226      The routine may ignore debug info that is known to not be useful with
 227      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 228   void (*expand_symtabs_with_filename) (struct objfile *objfile,
 229                                         const char *filename);
 230
 231   /* Return the file name of the file holding the global symbol in OBJFILE
 232      named NAME.  If no such symbol exists in OBJFILE, return NULL.  */
 233   const char *(*find_symbol_file) (struct objfile *objfile, const char *name);
 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) (const char *name, domain_enum namespace,
 253                                 struct objfile *, int global,
 254                                 int (*callback) (struct block *,
 255                                                  struct symbol *, void *),
 256                                 void *data,
 257                                 symbol_compare_ftype *match,
 258                                 symbol_compare_ftype *ordered_compare);
 259
 260   /* Expand all symbol tables in OBJFILE matching some criteria.
 261
 262      FILE_MATCHER is called for each file in OBJFILE.  The file name
 263      and the DATA argument are passed to it.  If it returns zero, this
 264      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 265
 266      Otherwise, if KIND does not match this symbol is skipped.
 267
 268      If even KIND matches, then NAME_MATCHER is called for each symbol
 269      defined in the file.  The symbol "search" name and DATA are passed
 270      to NAME_MATCHER.
 271
 272      If NAME_MATCHER returns zero, then this symbol is skipped.
 273
 274      Otherwise, this symbol's symbol table is expanded.
 275
 276      DATA is user data that is passed unmodified to the callback
 277      functions.  */
 278   void (*expand_symtabs_matching)
 279     (struct objfile *objfile,
 280      int (*file_matcher) (const char *, void *),
 281      int (*name_matcher) (const char *, void *),
 282      enum search_domain kind,
 283      void *data);
 284
 285   /* Return the symbol table from OBJFILE that contains PC and
 286      SECTION.  Return NULL if there is no such symbol table.  This
 287      should return the symbol table that contains a symbol whose
 288      address exactly matches PC, or, if there is no exact match, the
 289      symbol table that contains a symbol whose address is closest to
 290      PC.  */
 291   struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
 292                                          struct minimal_symbol *msymbol,
 293                                          CORE_ADDR pc,
 294                                          struct obj_section *section,
 295                                          int warn_if_readin);
 296
 297   /* Call a callback for every file defined in OBJFILE whose symtab is
 298      not already read in.  FUN is the callback.  It is passed the file's
 299      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 300      the DATA passed to this function.  */
 301   void (*map_symbol_filenames) (struct objfile *objfile,
 302                                 symbol_filename_ftype *fun, void *data,
 303                                 int need_fullname);
 304 };
 305
 306 /* Structure of functions used for probe support.  If one of these functions
 307    is provided, all must be.  */
 308
 309 struct sym_probe_fns
 310 {
 311   /* If non-NULL, return an array of probe objects.
 312
 313      The returned value does not have to be freed and it has lifetime of the
 314      OBJFILE.  */
 315   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 316
 317   /* Return the number of arguments available to PROBE.  PROBE will
 318      have come from a call to this objfile's sym_get_probes method.
 319      If you provide an implementation of sym_get_probes, you must
 320      implement this method as well.  */
 321   unsigned (*sym_get_probe_argument_count) (struct objfile *objfile,
 322                                             struct probe *probe);
 323
 324   /* Evaluate the Nth argument available to PROBE.  PROBE will have
 325      come from a call to this objfile's sym_get_probes method.  N will
 326      be between 0 and the number of arguments available to this probe.
 327      FRAME is the frame in which the evaluation is done; the frame's
 328      PC will match the address of the probe.  If you provide an
 329      implementation of sym_get_probes, you must implement this method
 330      as well.  */
 331   struct value *(*sym_evaluate_probe_argument) (struct objfile *objfile,
 332                                                 struct probe *probe,
 333                                                 unsigned n);
 334
 335   /* Compile the Nth probe argument to an agent expression.  PROBE
 336      will have come from a call to this objfile's sym_get_probes
 337      method.  N will be between 0 and the number of arguments
 338      available to this probe.  EXPR and VALUE are the agent expression
 339      that is being updated.  */
 340   void (*sym_compile_to_ax) (struct objfile *objfile,
 341                              struct probe *probe,
 342                              struct agent_expr *expr,
 343                              struct axs_value *value,
 344                              unsigned n);
 345
 346   /* Relocate the probe section of OBJFILE.  */
 347   void (*sym_relocate_probe) (struct objfile *objfile,
 348                               struct section_offsets *new_offsets,
 349                               struct section_offsets *delta);
 350 };
 351
 352 /* Structure to keep track of symbol reading functions for various
 353    object file types.  */
 354
 355 struct sym_fns
 356 {
 357
 358   /* BFD flavour that we handle, or (as a special kludge, see
 359      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 360
 361   enum bfd_flavour sym_flavour;
 362
 363   /* Initializes anything that is global to the entire symbol table.
 364      It is called during symbol_file_add, when we begin debugging an
 365      entirely new program.  */
 366
 367   void (*sym_new_init) (struct objfile *);
 368
 369   /* Reads any initial information from a symbol file, and initializes
 370      the struct sym_fns SF in preparation for sym_read().  It is
 371      called every time we read a symbol file for any reason.  */
 372
 373   void (*sym_init) (struct objfile *);
 374
 375   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 376      (or possibly a symtab).  OBJFILE is the objfile struct for the
 377      file we are reading.  SYMFILE_FLAGS are the flags passed to
 378      symbol_file_add & co.  */
 379
 380   void (*sym_read) (struct objfile *, int);
 381
 382   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 383      gdb has to check other ways if this objfile has any symbols.  This may
 384      only be non-NULL if the objfile actually does have debuginfo available.
 385      */
 386
 387   void (*sym_read_psymbols) (struct objfile *);
 388
 389   /* Called when we are finished with an objfile.  Should do all
 390      cleanup that is specific to the object file format for the
 391      particular objfile.  */
 392
 393   void (*sym_finish) (struct objfile *);
 394
 395   /* This function produces a file-dependent section_offsets
 396      structure, allocated in the objfile's storage, and based on the
 397      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 398      backward compatibility with the higher levels of GDB.  It should
 399      probably be changed to a string, where NULL means the default,
 400      and others are parsed in a file dependent way.  */
 401
 402   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 403
 404   /* This function produces a format-independent description of
 405      the segments of ABFD.  Each segment is a unit of the file
 406      which may be relocated independently.  */
 407
 408   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 409
 410   /* This function should read the linetable from the objfile when
 411      the line table cannot be read while processing the debugging
 412      information.  */
 413
 414   void (*sym_read_linetable) (void);
 415
 416   /* Relocate the contents of a debug section SECTP.  The
 417      contents are stored in BUF if it is non-NULL, or returned in a
 418      malloc'd buffer otherwise.  */
 419
 420   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 421
 422   /* If non-NULL, this objfile has probe support, and all the probe
 423      functions referred to here will be non-NULL.  */
 424   const struct sym_probe_fns *sym_probe_fns;
 425
 426   /* The "quick" (aka partial) symbol functions for this symbol
 427      reader.  */
 428   const struct quick_symbol_functions *qf;
 429 };
 430
 431 extern struct section_addr_info *
 432   build_section_addr_info_from_objfile (const struct objfile *objfile);
 433
 434 extern void relative_addr_info_to_section_offsets
 435   (struct section_offsets *section_offsets, int num_sections,
 436    struct section_addr_info *addrs);
 437
 438 extern void addr_info_make_relative (struct section_addr_info *addrs,
 439                                      bfd *abfd);
 440
 441 /* The default version of sym_fns.sym_offsets for readers that don't
 442    do anything special.  */
 443
 444 extern void default_symfile_offsets (struct objfile *objfile,
 445                                      struct section_addr_info *);
 446
 447 /* The default version of sym_fns.sym_segments for readers that don't
 448    do anything special.  */
 449
 450 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 451
 452 /* The default version of sym_fns.sym_relocate for readers that don't
 453    do anything special.  */
 454
 455 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 456                                            asection *sectp, bfd_byte *buf);
 457
 458 extern struct symtab *allocate_symtab (const char *, struct objfile *);
 459
 460 extern void add_symtab_fns (const struct sym_fns *);
 461
 462 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 463    syms_from_objfile, symbol_file_add, etc.  */
 464
 465 enum symfile_add_flags
 466   {
 467     /* Be chatty about what you are doing.  */
 468     SYMFILE_VERBOSE = 1 << 1,
 469
 470     /* This is the main symbol file (as opposed to symbol file for dynamically
 471        loaded code).  */
 472     SYMFILE_MAINLINE = 1 << 2,
 473
 474     /* Do not call breakpoint_re_set when adding this symbol file.  */
 475     SYMFILE_DEFER_BP_RESET = 1 << 3,
 476
 477     /* Do not immediately read symbols for this file.  By default,
 478        symbols are read when the objfile is created.  */
 479     SYMFILE_NO_READ = 1 << 4
 480   };
 481
 482 extern void syms_from_objfile (struct objfile *,
 483                                struct section_addr_info *,
 484                                struct section_offsets *, int, int);
 485
 486 extern void new_symfile_objfile (struct objfile *, int);
 487
 488 extern struct objfile *symbol_file_add (char *, int,
 489                                         struct section_addr_info *, int);
 490
 491 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 492                                                  struct section_addr_info *,
 493                                                  int, struct objfile *parent);
 494
 495 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 496
 497 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 498
 499 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 500
 501 extern struct section_addr_info *alloc_section_addr_info (size_t
 502                                                           num_sections);
 503
 504 /* Build (allocate and populate) a section_addr_info struct from an
 505    existing section table.  */
 506
 507 extern struct section_addr_info
 508   *build_section_addr_info_from_section_table (const struct target_section
 509                                                *start,
 510                                                const struct target_section
 511                                                *end);
 512
 513 /* Free all memory allocated by
 514    build_section_addr_info_from_section_table.  */
 515
 516 extern void free_section_addr_info (struct section_addr_info *);
 517
 518
 519 /* Make a copy of the string at PTR with SIZE characters in the symbol
 520    obstack (and add a null character at the end in the copy).  Returns
 521    the address of the copy.  */
 522
 523 extern char *obsavestring (const char *, int, struct obstack *);
 524
 525 /* Concatenate NULL terminated variable argument list of `const char
 526    *' strings; return the new string.  Space is found in the OBSTACKP.
 527    Argument list must be terminated by a sentinel expression `(char *)
 528    NULL'.  */
 529
 530 extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
 531
 532                         /*   Variables   */
 533
 534 /* If non-zero, shared library symbols will be added automatically
 535    when the inferior is created, new libraries are loaded, or when
 536    attaching to the inferior.  This is almost always what users will
 537    want to have happen; but for very large programs, the startup time
 538    will be excessive, and so if this is a problem, the user can clear
 539    this flag and then add the shared library symbols as needed.  Note
 540    that there is a potential for confusion, since if the shared
 541    library symbols are not loaded, commands like "info fun" will *not*
 542    report all the functions that are actually present.  */
 543
 544 extern int auto_solib_add;
 545
 546 /* From symfile.c */
 547
 548 extern void set_initial_language (void);
 549
 550 extern void find_lowest_section (bfd *, asection *, void *);
 551
 552 extern bfd *symfile_bfd_open (char *);
 553
 554 extern bfd *bfd_open_maybe_remote (const char *);
 555
 556 extern int get_section_index (struct objfile *, char *);
 557
 558 /* Utility functions for overlay sections: */
 559 extern enum overlay_debugging_state
 560 {
 561   ovly_off,
 562   ovly_on,
 563   ovly_auto
 564 } overlay_debugging;
 565 extern int overlay_cache_invalid;
 566
 567 /* Return the "mapped" overlay section containing the PC.  */
 568 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 569
 570 /* Return any overlay section containing the PC (even in its LMA
 571    region).  */
 572 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 573
 574 /* Return true if the section is an overlay.  */
 575 extern int section_is_overlay (struct obj_section *);
 576
 577 /* Return true if the overlay section is currently "mapped".  */
 578 extern int section_is_mapped (struct obj_section *);
 579
 580 /* Return true if pc belongs to section's VMA.  */
 581 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 582
 583 /* Return true if pc belongs to section's LMA.  */
 584 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 585
 586 /* Map an address from a section's LMA to its VMA.  */
 587 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 588
 589 /* Map an address from a section's VMA to its LMA.  */
 590 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 591
 592 /* Convert an address in an overlay section (force into VMA range).  */
 593 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 594
 595 /* Load symbols from a file.  */
 596 extern void symbol_file_add_main (char *args, int from_tty);
 597
 598 /* Clear GDB symbol tables.  */
 599 extern void symbol_file_clear (int from_tty);
 600
 601 /* Default overlay update function.  */
 602 extern void simple_overlay_update (struct obj_section *);
 603
 604 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 605                                                  bfd_byte *);
 606
 607 extern int symfile_map_offsets_to_segments (bfd *,
 608                                             struct symfile_segment_data *,
 609                                             struct section_offsets *,
 610                                             int, const CORE_ADDR *);
 611 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 612 void free_symfile_segment_data (struct symfile_segment_data *data);
 613
 614 extern struct cleanup *increment_reading_symtab (void);
 615
 616 /* From dwarf2read.c */
 617
 618 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 619    section name (usually from the DWARF standard), while the field COMPRESSED
 620    is the name of compressed sections.  If your object file format doesn't
 621    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 622    the debugging section is not supported, the field NORMAL can be NULL too.
 623    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 624    field.  */
 625
 626 struct dwarf2_section_names {
 627   const char *normal;
 628   const char *compressed;
 629 };
 630
 631 /* List of names for dward2 debugging sections.  Also most object file formats
 632    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 633    due to restrictions.
 634    The table for the standard names is defined in dwarf2read.c.  Please
 635    update all instances of dwarf2_debug_sections if you add a field to this
 636    structure.  It is always safe to use { NULL, NULL } in this case.  */
 637
 638 struct dwarf2_debug_sections {
 639   struct dwarf2_section_names info;
 640   struct dwarf2_section_names abbrev;
 641   struct dwarf2_section_names line;
 642   struct dwarf2_section_names loc;
 643   struct dwarf2_section_names macinfo;
 644   struct dwarf2_section_names macro;
 645   struct dwarf2_section_names str;
 646   struct dwarf2_section_names ranges;
 647   struct dwarf2_section_names types;
 648   struct dwarf2_section_names addr;
 649   struct dwarf2_section_names frame;
 650   struct dwarf2_section_names eh_frame;
 651   struct dwarf2_section_names gdb_index;
 652   /* This field has no meaning, but exists solely to catch changes to
 653      this structure which are not reflected in some instance.  */
 654   int sentinel;
 655 };
 656
 657 extern int dwarf2_has_info (struct objfile *,
 658                             const struct dwarf2_debug_sections *);
 659
 660 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 661 enum dwarf2_section_enum {
 662   DWARF2_DEBUG_FRAME,
 663   DWARF2_EH_FRAME
 664 };
 665
 666 extern void dwarf2_get_section_info (struct objfile *,
 667                                      enum dwarf2_section_enum,
 668                                      asection **, gdb_byte **,
 669                                      bfd_size_type *);
 670
 671 extern int dwarf2_initialize_objfile (struct objfile *);
 672 extern void dwarf2_build_psymtabs (struct objfile *);
 673 extern void dwarf2_build_frame_info (struct objfile *);
 674
 675 void dwarf2_free_objfile (struct objfile *);
 676
 677 /* Whether to use deprecated .gdb_index sections.  */
 678 extern int use_deprecated_index_sections;
 679
 680 /* From mdebugread.c */
 681
 682 /* Hack to force structures to exist before use in parameter list.  */
 683 struct ecoff_debug_hack
 684 {
 685   struct ecoff_debug_swap *a;
 686   struct ecoff_debug_info *b;
 687 };
 688
 689 extern void mdebug_build_psymtabs (struct objfile *,
 690                                    const struct ecoff_debug_swap *,
 691                                    struct ecoff_debug_info *);
 692
 693 extern void elfmdebug_build_psymtabs (struct objfile *,
 694                                       const struct ecoff_debug_swap *,
 695                                       asection *);
 696
 697 #endif /* !defined(SYMFILE_H) */