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 "probe.h"
  26
  27 /* Opaque declarations.  */
  28 struct target_section;
  29 struct objfile;
  30 struct obj_section;
  31 struct obstack;
  32 struct block;
  33 struct probe;
  34 struct value;
  35 struct frame_info;
  36 struct agent_expr;
  37 struct axs_value;
  38
  39 /* Comparison function for symbol look ups.  */
  40
  41 typedef int (symbol_compare_ftype) (const char *string1,
  42                                     const char *string2);
  43
  44 /* Partial symbols are stored in the psymbol_cache and pointers to
  45    them are kept in a dynamically grown array that is obtained from
  46    malloc and grown as necessary via realloc.  Each objfile typically
  47    has two of these, one for global symbols and one for static
  48    symbols.  Although this adds a level of indirection for storing or
  49    accessing the partial symbols, it allows us to throw away duplicate
  50    psymbols and set all pointers to the single saved instance.  */
  51
  52 struct psymbol_allocation_list
  53 {
  54
  55   /* Pointer to beginning of dynamically allocated array of pointers
  56      to partial symbols.  The array is dynamically expanded as
  57      necessary to accommodate more pointers.  */
  58
  59   struct partial_symbol **list;
  60
  61   /* Pointer to next available slot in which to store a pointer to a
  62      partial symbol.  */
  63
  64   struct partial_symbol **next;
  65
  66   /* Number of allocated pointer slots in current dynamic array (not
  67      the number of bytes of storage).  The "next" pointer will always
  68      point somewhere between list[0] and list[size], and when at
  69      list[size] the array will be expanded on the next attempt to
  70      store a pointer.  */
  71
  72   int size;
  73 };
  74
  75 /* Define an array of addresses to accommodate non-contiguous dynamic
  76    loading of modules.  This is for use when entering commands, so we
  77    can keep track of the section names until we read the file and can
  78    map them to bfd sections.  This structure is also used by solib.c
  79    to communicate the section addresses in shared objects to
  80    symbol_file_add ().  */
  81
  82 struct section_addr_info
  83 {
  84   /* The number of sections for which address information is
  85      available.  */
  86   size_t num_sections;
  87   /* Sections whose names are file format dependent.  */
  88   struct other_sections
  89   {
  90     CORE_ADDR addr;
  91     char *name;
  92
  93     /* SECTINDEX must be valid for associated BFD or set to -1.  */
  94     int sectindex;
  95   } other[1];
  96 };
  97
  98
  99 /* A table listing the load segments in a symfile, and which segment
 100    each BFD section belongs to.  */
 101 struct symfile_segment_data
 102 {
 103   /* How many segments are present in this file.  If there are
 104      two, the text segment is the first one and the data segment
 105      is the second one.  */
 106   int num_segments;
 107
 108   /* If NUM_SEGMENTS is greater than zero, the original base address
 109      of each segment.  */
 110   CORE_ADDR *segment_bases;
 111
 112   /* If NUM_SEGMENTS is greater than zero, the memory size of each
 113      segment.  */
 114   CORE_ADDR *segment_sizes;
 115
 116   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
 117      recording which segment contains each BFD section.
 118      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
 119      S, or zero if it is not in any segment.  */
 120   int *segment_info;
 121 };
 122
 123 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
 124
 125 typedef void (symbol_filename_ftype) (const char *filename,
 126                                       const char *fullname, void *data);
 127
 128 /* The "quick" symbol functions exist so that symbol readers can
 129    avoiding an initial read of all the symbols.  For example, symbol
 130    readers might choose to use the "partial symbol table" utilities,
 131    which is one implementation of the quick symbol functions.
 132
 133    The quick symbol functions are generally opaque: the underlying
 134    representation is hidden from the caller.
 135
 136    In general, these functions should only look at whatever special
 137    index the symbol reader creates -- looking through the symbol
 138    tables themselves is handled by generic code.  If a function is
 139    defined as returning a "symbol table", this means that the function
 140    should only return a newly-created symbol table; it should not
 141    examine pre-existing ones.
 142
 143    The exact list of functions here was determined in an ad hoc way
 144    based on gdb's history.  */
 145
 146 struct quick_symbol_functions
 147 {
 148   /* Return true if this objfile has any "partial" symbols
 149      available.  */
 150   int (*has_symbols) (struct objfile *objfile);
 151
 152   /* Return the symbol table for the "last" file appearing in
 153      OBJFILE.  */
 154   struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
 155
 156   /* Forget all cached full file names for OBJFILE.  */
 157   void (*forget_cached_source_info) (struct objfile *objfile);
 158
 159   /* Expand and iterate over each "partial" symbol table in OBJFILE
 160      where the source file is named NAME.
 161
 162      If NAME is not absolute, a match after a '/' in the symbol
 163      table's file name will also work.  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.  If OBJFILE
 186      contains !TYPE_OPAQUE symbol prefer its symtab.  If it contains
 187      only TYPE_OPAQUE symbol(s), return at least that symtab.  */
 188   struct symtab *(*lookup_symbol) (struct objfile *objfile,
 189                                    int kind, const char *name,
 190                                    domain_enum domain);
 191
 192   /* This is called to expand symbol tables before looking up a
 193      symbol.  A backend can choose to implement this and then have its
 194      `lookup_symbol' hook always return NULL, or the reverse.  (It
 195      doesn't make sense to implement both.)  The arguments are as for
 196      `lookup_symbol'.  */
 197   void (*pre_expand_symtabs_matching) (struct objfile *objfile,
 198                                        enum block_enum block_kind,
 199                                        const char *name,
 200                                        domain_enum domain);
 201
 202   /* Print statistics about any indices loaded for OBJFILE.  The
 203      statistics should be printed to gdb_stdout.  This is used for
 204      "maint print statistics".  */
 205   void (*print_stats) (struct objfile *objfile);
 206
 207   /* Dump any indices loaded for OBJFILE.  The dump should go to
 208      gdb_stdout.  This is used for "maint print objfiles".  */
 209   void (*dump) (struct objfile *objfile);
 210
 211   /* This is called by objfile_relocate to relocate any indices loaded
 212      for OBJFILE.  */
 213   void (*relocate) (struct objfile *objfile,
 214                     struct section_offsets *new_offsets,
 215                     struct section_offsets *delta);
 216
 217   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 218      the corresponding symbol tables are loaded.  */
 219   void (*expand_symtabs_for_function) (struct objfile *objfile,
 220                                        const char *func_name);
 221
 222   /* Read all symbol tables associated with OBJFILE.  */
 223   void (*expand_all_symtabs) (struct objfile *objfile);
 224
 225   /* Read all symbol tables associated with OBJFILE which have the
 226      file name FILENAME.
 227      This is for the purposes of examining code only, e.g., expand_line_sal.
 228      The routine may ignore debug info that is known to not be useful with
 229      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 230   void (*expand_symtabs_with_filename) (struct objfile *objfile,
 231                                         const char *filename);
 232
 233   /* Return the file name of the file holding the global symbol in OBJFILE
 234      named NAME.  If no such symbol exists in OBJFILE, return NULL.  */
 235   const char *(*find_symbol_file) (struct objfile *objfile, const char *name);
 236
 237   /* Find global or static symbols in all tables that are in NAMESPACE
 238      and for which MATCH (symbol name, NAME) == 0, passing each to
 239      CALLBACK, reading in partial symbol tables as needed.  Look
 240      through global symbols if GLOBAL and otherwise static symbols.
 241      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 242      found.  After each block is processed, passes NULL to CALLBACK.
 243      MATCH must be weaker than strcmp_iw_ordered in the sense that
 244      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 245      if non-null, must be an ordering relation compatible with
 246      strcmp_iw_ordered in the sense that
 247             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 248      and
 249             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 250      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 251      CALLBACK returns 0 to indicate that the scan should continue, or
 252      non-zero to indicate that the scan should be terminated.  */
 253
 254   void (*map_matching_symbols) (const char *name, domain_enum namespace,
 255                                 struct objfile *, int global,
 256                                 int (*callback) (struct block *,
 257                                                  struct symbol *, void *),
 258                                 void *data,
 259                                 symbol_compare_ftype *match,
 260                                 symbol_compare_ftype *ordered_compare);
 261
 262   /* Expand all symbol tables in OBJFILE matching some criteria.
 263
 264      FILE_MATCHER is called for each file in OBJFILE.  The file name
 265      and the DATA argument are passed to it.  If it returns zero, this
 266      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 267
 268      Otherwise, if KIND does not match this symbol is skipped.
 269
 270      If even KIND matches, then NAME_MATCHER is called for each symbol
 271      defined in the file.  The symbol "search" name and DATA are passed
 272      to NAME_MATCHER.
 273
 274      If NAME_MATCHER returns zero, then this symbol is skipped.
 275
 276      Otherwise, this symbol's symbol table is expanded.
 277
 278      DATA is user data that is passed unmodified to the callback
 279      functions.  */
 280   void (*expand_symtabs_matching)
 281     (struct objfile *objfile,
 282      int (*file_matcher) (const char *, void *),
 283      int (*name_matcher) (const char *, void *),
 284      enum search_domain kind,
 285      void *data);
 286
 287   /* Return the symbol table from OBJFILE that contains PC and
 288      SECTION.  Return NULL if there is no such symbol table.  This
 289      should return the symbol table that contains a symbol whose
 290      address exactly matches PC, or, if there is no exact match, the
 291      symbol table that contains a symbol whose address is closest to
 292      PC.  */
 293   struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
 294                                          struct minimal_symbol *msymbol,
 295                                          CORE_ADDR pc,
 296                                          struct obj_section *section,
 297                                          int warn_if_readin);
 298
 299   /* Call a callback for every file defined in OBJFILE whose symtab is
 300      not already read in.  FUN is the callback.  It is passed the file's
 301      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 302      the DATA passed to this function.  */
 303   void (*map_symbol_filenames) (struct objfile *objfile,
 304                                 symbol_filename_ftype *fun, void *data,
 305                                 int need_fullname);
 306 };
 307
 308 /* Structure of functions used for probe support.  If one of these functions
 309    is provided, all must be.  */
 310
 311 struct sym_probe_fns
 312 {
 313   /* If non-NULL, return an array of probe objects.
 314
 315      The returned value does not have to be freed and it has lifetime of the
 316      OBJFILE.  */
 317   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 318
 319   /* Return the number of arguments available to PROBE.  PROBE will
 320      have come from a call to this objfile's sym_get_probes method.
 321      If you provide an implementation of sym_get_probes, you must
 322      implement this method as well.  */
 323   unsigned (*sym_get_probe_argument_count) (struct probe *probe);
 324
 325   /* Evaluate the Nth argument available to PROBE.  PROBE will have
 326      come from a call to this objfile's sym_get_probes method.  N will
 327      be between 0 and the number of arguments available to this probe.
 328      FRAME is the frame in which the evaluation is done; the frame's
 329      PC will match the address of the probe.  If you provide an
 330      implementation of sym_get_probes, you must implement this method
 331      as well.  */
 332   struct value *(*sym_evaluate_probe_argument) (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 probe *probe,
 341                              struct agent_expr *expr,
 342                              struct axs_value *value,
 343                              unsigned n);
 344
 345   /* Relocate the probe section of OBJFILE.  */
 346   void (*sym_relocate_probe) (struct objfile *objfile,
 347                               struct section_offsets *new_offsets,
 348                               struct section_offsets *delta);
 349 };
 350
 351 /* Structure to keep track of symbol reading functions for various
 352    object file types.  */
 353
 354 struct sym_fns
 355 {
 356
 357   /* BFD flavour that we handle, or (as a special kludge, see
 358      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 359
 360   enum bfd_flavour sym_flavour;
 361
 362   /* Initializes anything that is global to the entire symbol table.
 363      It is called during symbol_file_add, when we begin debugging an
 364      entirely new program.  */
 365
 366   void (*sym_new_init) (struct objfile *);
 367
 368   /* Reads any initial information from a symbol file, and initializes
 369      the struct sym_fns SF in preparation for sym_read().  It is
 370      called every time we read a symbol file for any reason.  */
 371
 372   void (*sym_init) (struct objfile *);
 373
 374   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 375      (or possibly a symtab).  OBJFILE is the objfile struct for the
 376      file we are reading.  SYMFILE_FLAGS are the flags passed to
 377      symbol_file_add & co.  */
 378
 379   void (*sym_read) (struct objfile *, int);
 380
 381   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 382      gdb has to check other ways if this objfile has any symbols.  This may
 383      only be non-NULL if the objfile actually does have debuginfo available.
 384      */
 385
 386   void (*sym_read_psymbols) (struct objfile *);
 387
 388   /* Called when we are finished with an objfile.  Should do all
 389      cleanup that is specific to the object file format for the
 390      particular objfile.  */
 391
 392   void (*sym_finish) (struct objfile *);
 393
 394   /* This function produces a file-dependent section_offsets
 395      structure, allocated in the objfile's storage, and based on the
 396      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 397      backward compatibility with the higher levels of GDB.  It should
 398      probably be changed to a string, where NULL means the default,
 399      and others are parsed in a file dependent way.  */
 400
 401   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 402
 403   /* This function produces a format-independent description of
 404      the segments of ABFD.  Each segment is a unit of the file
 405      which may be relocated independently.  */
 406
 407   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 408
 409   /* This function should read the linetable from the objfile when
 410      the line table cannot be read while processing the debugging
 411      information.  */
 412
 413   void (*sym_read_linetable) (void);
 414
 415   /* Relocate the contents of a debug section SECTP.  The
 416      contents are stored in BUF if it is non-NULL, or returned in a
 417      malloc'd buffer otherwise.  */
 418
 419   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 420
 421   /* If non-NULL, this objfile has probe support, and all the probe
 422      functions referred to here will be non-NULL.  */
 423   const struct sym_probe_fns *sym_probe_fns;
 424
 425   /* The "quick" (aka partial) symbol functions for this symbol
 426      reader.  */
 427   const struct quick_symbol_functions *qf;
 428 };
 429
 430 extern struct section_addr_info *
 431   build_section_addr_info_from_objfile (const struct objfile *objfile);
 432
 433 extern void relative_addr_info_to_section_offsets
 434   (struct section_offsets *section_offsets, int num_sections,
 435    struct section_addr_info *addrs);
 436
 437 extern void addr_info_make_relative (struct section_addr_info *addrs,
 438                                      bfd *abfd);
 439
 440 /* The default version of sym_fns.sym_offsets for readers that don't
 441    do anything special.  */
 442
 443 extern void default_symfile_offsets (struct objfile *objfile,
 444                                      struct section_addr_info *);
 445
 446 /* The default version of sym_fns.sym_segments for readers that don't
 447    do anything special.  */
 448
 449 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 450
 451 /* The default version of sym_fns.sym_relocate for readers that don't
 452    do anything special.  */
 453
 454 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 455                                            asection *sectp, bfd_byte *buf);
 456
 457 extern struct symtab *allocate_symtab (const char *, struct objfile *);
 458
 459 extern void add_symtab_fns (const struct sym_fns *);
 460
 461 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 462    syms_from_objfile, symbol_file_add, etc.  */
 463
 464 enum symfile_add_flags
 465   {
 466     /* Be chatty about what you are doing.  */
 467     SYMFILE_VERBOSE = 1 << 1,
 468
 469     /* This is the main symbol file (as opposed to symbol file for dynamically
 470        loaded code).  */
 471     SYMFILE_MAINLINE = 1 << 2,
 472
 473     /* Do not call breakpoint_re_set when adding this symbol file.  */
 474     SYMFILE_DEFER_BP_RESET = 1 << 3,
 475
 476     /* Do not immediately read symbols for this file.  By default,
 477        symbols are read when the objfile is created.  */
 478     SYMFILE_NO_READ = 1 << 4
 479   };
 480
 481 extern void syms_from_objfile (struct objfile *,
 482                                struct section_addr_info *,
 483                                struct section_offsets *, int, int);
 484
 485 extern void new_symfile_objfile (struct objfile *, int);
 486
 487 extern struct objfile *symbol_file_add (char *, int,
 488                                         struct section_addr_info *, int);
 489
 490 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 491                                                  struct section_addr_info *,
 492                                                  int, struct objfile *parent);
 493
 494 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 495
 496 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 497
 498 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 499
 500 extern struct section_addr_info *alloc_section_addr_info (size_t
 501                                                           num_sections);
 502
 503 /* Build (allocate and populate) a section_addr_info struct from an
 504    existing section table.  */
 505
 506 extern struct section_addr_info
 507   *build_section_addr_info_from_section_table (const struct target_section
 508                                                *start,
 509                                                const struct target_section
 510                                                *end);
 511
 512 /* Free all memory allocated by
 513    build_section_addr_info_from_section_table.  */
 514
 515 extern void free_section_addr_info (struct section_addr_info *);
 516
 517
 518 /* Make a copy of the string at PTR with SIZE characters in the symbol
 519    obstack (and add a null character at the end in the copy).  Returns
 520    the address of the copy.  */
 521
 522 extern char *obsavestring (const char *, int, struct obstack *);
 523
 524 /* Concatenate NULL terminated variable argument list of `const char
 525    *' strings; return the new string.  Space is found in the OBSTACKP.
 526    Argument list must be terminated by a sentinel expression `(char *)
 527    NULL'.  */
 528
 529 extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
 530
 531                         /*   Variables   */
 532
 533 /* If non-zero, shared library symbols will be added automatically
 534    when the inferior is created, new libraries are loaded, or when
 535    attaching to the inferior.  This is almost always what users will
 536    want to have happen; but for very large programs, the startup time
 537    will be excessive, and so if this is a problem, the user can clear
 538    this flag and then add the shared library symbols as needed.  Note
 539    that there is a potential for confusion, since if the shared
 540    library symbols are not loaded, commands like "info fun" will *not*
 541    report all the functions that are actually present.  */
 542
 543 extern int auto_solib_add;
 544
 545 /* From symfile.c */
 546
 547 extern void set_initial_language (void);
 548
 549 extern void find_lowest_section (bfd *, asection *, void *);
 550
 551 extern bfd *symfile_bfd_open (char *);
 552
 553 extern bfd *gdb_bfd_open_maybe_remote (const char *);
 554
 555 extern int get_section_index (struct objfile *, char *);
 556
 557 /* Utility functions for overlay sections: */
 558 extern enum overlay_debugging_state
 559 {
 560   ovly_off,
 561   ovly_on,
 562   ovly_auto
 563 } overlay_debugging;
 564 extern int overlay_cache_invalid;
 565
 566 /* Return the "mapped" overlay section containing the PC.  */
 567 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 568
 569 /* Return any overlay section containing the PC (even in its LMA
 570    region).  */
 571 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 572
 573 /* Return true if the section is an overlay.  */
 574 extern int section_is_overlay (struct obj_section *);
 575
 576 /* Return true if the overlay section is currently "mapped".  */
 577 extern int section_is_mapped (struct obj_section *);
 578
 579 /* Return true if pc belongs to section's VMA.  */
 580 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 581
 582 /* Return true if pc belongs to section's LMA.  */
 583 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 584
 585 /* Map an address from a section's LMA to its VMA.  */
 586 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 587
 588 /* Map an address from a section's VMA to its LMA.  */
 589 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 590
 591 /* Convert an address in an overlay section (force into VMA range).  */
 592 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 593
 594 /* Load symbols from a file.  */
 595 extern void symbol_file_add_main (char *args, int from_tty);
 596
 597 /* Clear GDB symbol tables.  */
 598 extern void symbol_file_clear (int from_tty);
 599
 600 /* Default overlay update function.  */
 601 extern void simple_overlay_update (struct obj_section *);
 602
 603 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 604                                                  bfd_byte *);
 605
 606 extern int symfile_map_offsets_to_segments (bfd *,
 607                                             struct symfile_segment_data *,
 608                                             struct section_offsets *,
 609                                             int, const CORE_ADDR *);
 610 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 611 void free_symfile_segment_data (struct symfile_segment_data *data);
 612
 613 extern struct cleanup *increment_reading_symtab (void);
 614
 615 /* From dwarf2read.c */
 616
 617 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 618    section name (usually from the DWARF standard), while the field COMPRESSED
 619    is the name of compressed sections.  If your object file format doesn't
 620    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 621    the debugging section is not supported, the field NORMAL can be NULL too.
 622    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 623    field.  */
 624
 625 struct dwarf2_section_names {
 626   const char *normal;
 627   const char *compressed;
 628 };
 629
 630 /* List of names for dward2 debugging sections.  Also most object file formats
 631    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 632    due to restrictions.
 633    The table for the standard names is defined in dwarf2read.c.  Please
 634    update all instances of dwarf2_debug_sections if you add a field to this
 635    structure.  It is always safe to use { NULL, NULL } in this case.  */
 636
 637 struct dwarf2_debug_sections {
 638   struct dwarf2_section_names info;
 639   struct dwarf2_section_names abbrev;
 640   struct dwarf2_section_names line;
 641   struct dwarf2_section_names loc;
 642   struct dwarf2_section_names macinfo;
 643   struct dwarf2_section_names macro;
 644   struct dwarf2_section_names str;
 645   struct dwarf2_section_names ranges;
 646   struct dwarf2_section_names types;
 647   struct dwarf2_section_names addr;
 648   struct dwarf2_section_names frame;
 649   struct dwarf2_section_names eh_frame;
 650   struct dwarf2_section_names gdb_index;
 651   /* This field has no meaning, but exists solely to catch changes to
 652      this structure which are not reflected in some instance.  */
 653   int sentinel;
 654 };
 655
 656 extern int dwarf2_has_info (struct objfile *,
 657                             const struct dwarf2_debug_sections *);
 658
 659 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 660 enum dwarf2_section_enum {
 661   DWARF2_DEBUG_FRAME,
 662   DWARF2_EH_FRAME
 663 };
 664
 665 extern void dwarf2_get_section_info (struct objfile *,
 666                                      enum dwarf2_section_enum,
 667                                      asection **, gdb_byte **,
 668                                      bfd_size_type *);
 669
 670 extern int dwarf2_initialize_objfile (struct objfile *);
 671 extern void dwarf2_build_psymtabs (struct objfile *);
 672 extern void dwarf2_build_frame_info (struct objfile *);
 673
 674 void dwarf2_free_objfile (struct objfile *);
 675
 676 /* From mdebugread.c */
 677
 678 /* Hack to force structures to exist before use in parameter list.  */
 679 struct ecoff_debug_hack
 680 {
 681   struct ecoff_debug_swap *a;
 682   struct ecoff_debug_info *b;
 683 };
 684
 685 extern void mdebug_build_psymtabs (struct objfile *,
 686                                    const struct ecoff_debug_swap *,
 687                                    struct ecoff_debug_info *);
 688
 689 extern void elfmdebug_build_psymtabs (struct objfile *,
 690                                       const struct ecoff_debug_swap *,
 691                                       asection *);
 692
 693 #endif /* !defined(SYMFILE_H) */