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.  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 objfile *objfile,
 324                                             struct probe *probe);
 325
 326   /* Evaluate the Nth argument available to PROBE.  PROBE will have
 327      come from a call to this objfile's sym_get_probes method.  N will
 328      be between 0 and the number of arguments available to this probe.
 329      FRAME is the frame in which the evaluation is done; the frame's
 330      PC will match the address of the probe.  If you provide an
 331      implementation of sym_get_probes, you must implement this method
 332      as well.  */
 333   struct value *(*sym_evaluate_probe_argument) (struct objfile *objfile,
 334                                                 struct probe *probe,
 335                                                 unsigned n);
 336
 337   /* Compile the Nth probe argument to an agent expression.  PROBE
 338      will have come from a call to this objfile's sym_get_probes
 339      method.  N will be between 0 and the number of arguments
 340      available to this probe.  EXPR and VALUE are the agent expression
 341      that is being updated.  */
 342   void (*sym_compile_to_ax) (struct objfile *objfile,
 343                              struct probe *probe,
 344                              struct agent_expr *expr,
 345                              struct axs_value *value,
 346                              unsigned n);
 347
 348   /* Relocate the probe section of OBJFILE.  */
 349   void (*sym_relocate_probe) (struct objfile *objfile,
 350                               struct section_offsets *new_offsets,
 351                               struct section_offsets *delta);
 352 };
 353
 354 /* Structure to keep track of symbol reading functions for various
 355    object file types.  */
 356
 357 struct sym_fns
 358 {
 359
 360   /* BFD flavour that we handle, or (as a special kludge, see
 361      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 362
 363   enum bfd_flavour sym_flavour;
 364
 365   /* Initializes anything that is global to the entire symbol table.
 366      It is called during symbol_file_add, when we begin debugging an
 367      entirely new program.  */
 368
 369   void (*sym_new_init) (struct objfile *);
 370
 371   /* Reads any initial information from a symbol file, and initializes
 372      the struct sym_fns SF in preparation for sym_read().  It is
 373      called every time we read a symbol file for any reason.  */
 374
 375   void (*sym_init) (struct objfile *);
 376
 377   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 378      (or possibly a symtab).  OBJFILE is the objfile struct for the
 379      file we are reading.  SYMFILE_FLAGS are the flags passed to
 380      symbol_file_add & co.  */
 381
 382   void (*sym_read) (struct objfile *, int);
 383
 384   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 385      gdb has to check other ways if this objfile has any symbols.  This may
 386      only be non-NULL if the objfile actually does have debuginfo available.
 387      */
 388
 389   void (*sym_read_psymbols) (struct objfile *);
 390
 391   /* Called when we are finished with an objfile.  Should do all
 392      cleanup that is specific to the object file format for the
 393      particular objfile.  */
 394
 395   void (*sym_finish) (struct objfile *);
 396
 397   /* This function produces a file-dependent section_offsets
 398      structure, allocated in the objfile's storage, and based on the
 399      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 400      backward compatibility with the higher levels of GDB.  It should
 401      probably be changed to a string, where NULL means the default,
 402      and others are parsed in a file dependent way.  */
 403
 404   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 405
 406   /* This function produces a format-independent description of
 407      the segments of ABFD.  Each segment is a unit of the file
 408      which may be relocated independently.  */
 409
 410   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 411
 412   /* This function should read the linetable from the objfile when
 413      the line table cannot be read while processing the debugging
 414      information.  */
 415
 416   void (*sym_read_linetable) (void);
 417
 418   /* Relocate the contents of a debug section SECTP.  The
 419      contents are stored in BUF if it is non-NULL, or returned in a
 420      malloc'd buffer otherwise.  */
 421
 422   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 423
 424   /* If non-NULL, this objfile has probe support, and all the probe
 425      functions referred to here will be non-NULL.  */
 426   const struct sym_probe_fns *sym_probe_fns;
 427
 428   /* The "quick" (aka partial) symbol functions for this symbol
 429      reader.  */
 430   const struct quick_symbol_functions *qf;
 431 };
 432
 433 extern struct section_addr_info *
 434   build_section_addr_info_from_objfile (const struct objfile *objfile);
 435
 436 extern void relative_addr_info_to_section_offsets
 437   (struct section_offsets *section_offsets, int num_sections,
 438    struct section_addr_info *addrs);
 439
 440 extern void addr_info_make_relative (struct section_addr_info *addrs,
 441                                      bfd *abfd);
 442
 443 /* The default version of sym_fns.sym_offsets for readers that don't
 444    do anything special.  */
 445
 446 extern void default_symfile_offsets (struct objfile *objfile,
 447                                      struct section_addr_info *);
 448
 449 /* The default version of sym_fns.sym_segments for readers that don't
 450    do anything special.  */
 451
 452 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 453
 454 /* The default version of sym_fns.sym_relocate for readers that don't
 455    do anything special.  */
 456
 457 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 458                                            asection *sectp, bfd_byte *buf);
 459
 460 extern struct symtab *allocate_symtab (const char *, struct objfile *);
 461
 462 extern void add_symtab_fns (const struct sym_fns *);
 463
 464 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 465    syms_from_objfile, symbol_file_add, etc.  */
 466
 467 enum symfile_add_flags
 468   {
 469     /* Be chatty about what you are doing.  */
 470     SYMFILE_VERBOSE = 1 << 1,
 471
 472     /* This is the main symbol file (as opposed to symbol file for dynamically
 473        loaded code).  */
 474     SYMFILE_MAINLINE = 1 << 2,
 475
 476     /* Do not call breakpoint_re_set when adding this symbol file.  */
 477     SYMFILE_DEFER_BP_RESET = 1 << 3,
 478
 479     /* Do not immediately read symbols for this file.  By default,
 480        symbols are read when the objfile is created.  */
 481     SYMFILE_NO_READ = 1 << 4
 482   };
 483
 484 extern void syms_from_objfile (struct objfile *,
 485                                struct section_addr_info *,
 486                                struct section_offsets *, int, int);
 487
 488 extern void new_symfile_objfile (struct objfile *, int);
 489
 490 extern struct objfile *symbol_file_add (char *, int,
 491                                         struct section_addr_info *, int);
 492
 493 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 494                                                  struct section_addr_info *,
 495                                                  int, struct objfile *parent);
 496
 497 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 498
 499 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 500
 501 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 502
 503 extern struct section_addr_info *alloc_section_addr_info (size_t
 504                                                           num_sections);
 505
 506 /* Build (allocate and populate) a section_addr_info struct from an
 507    existing section table.  */
 508
 509 extern struct section_addr_info
 510   *build_section_addr_info_from_section_table (const struct target_section
 511                                                *start,
 512                                                const struct target_section
 513                                                *end);
 514
 515 /* Free all memory allocated by
 516    build_section_addr_info_from_section_table.  */
 517
 518 extern void free_section_addr_info (struct section_addr_info *);
 519
 520
 521 /* Make a copy of the string at PTR with SIZE characters in the symbol
 522    obstack (and add a null character at the end in the copy).  Returns
 523    the address of the copy.  */
 524
 525 extern char *obsavestring (const char *, int, struct obstack *);
 526
 527 /* Concatenate NULL terminated variable argument list of `const char
 528    *' strings; return the new string.  Space is found in the OBSTACKP.
 529    Argument list must be terminated by a sentinel expression `(char *)
 530    NULL'.  */
 531
 532 extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
 533
 534                         /*   Variables   */
 535
 536 /* If non-zero, shared library symbols will be added automatically
 537    when the inferior is created, new libraries are loaded, or when
 538    attaching to the inferior.  This is almost always what users will
 539    want to have happen; but for very large programs, the startup time
 540    will be excessive, and so if this is a problem, the user can clear
 541    this flag and then add the shared library symbols as needed.  Note
 542    that there is a potential for confusion, since if the shared
 543    library symbols are not loaded, commands like "info fun" will *not*
 544    report all the functions that are actually present.  */
 545
 546 extern int auto_solib_add;
 547
 548 /* From symfile.c */
 549
 550 extern void set_initial_language (void);
 551
 552 extern void find_lowest_section (bfd *, asection *, void *);
 553
 554 extern bfd *symfile_bfd_open (char *);
 555
 556 extern bfd *bfd_open_maybe_remote (const char *);
 557
 558 extern int get_section_index (struct objfile *, char *);
 559
 560 /* Utility functions for overlay sections: */
 561 extern enum overlay_debugging_state
 562 {
 563   ovly_off,
 564   ovly_on,
 565   ovly_auto
 566 } overlay_debugging;
 567 extern int overlay_cache_invalid;
 568
 569 /* Return the "mapped" overlay section containing the PC.  */
 570 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 571
 572 /* Return any overlay section containing the PC (even in its LMA
 573    region).  */
 574 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 575
 576 /* Return true if the section is an overlay.  */
 577 extern int section_is_overlay (struct obj_section *);
 578
 579 /* Return true if the overlay section is currently "mapped".  */
 580 extern int section_is_mapped (struct obj_section *);
 581
 582 /* Return true if pc belongs to section's VMA.  */
 583 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 584
 585 /* Return true if pc belongs to section's LMA.  */
 586 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 587
 588 /* Map an address from a section's LMA to its VMA.  */
 589 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 590
 591 /* Map an address from a section's VMA to its LMA.  */
 592 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 593
 594 /* Convert an address in an overlay section (force into VMA range).  */
 595 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 596
 597 /* Load symbols from a file.  */
 598 extern void symbol_file_add_main (char *args, int from_tty);
 599
 600 /* Clear GDB symbol tables.  */
 601 extern void symbol_file_clear (int from_tty);
 602
 603 /* Default overlay update function.  */
 604 extern void simple_overlay_update (struct obj_section *);
 605
 606 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 607                                                  bfd_byte *);
 608
 609 extern int symfile_map_offsets_to_segments (bfd *,
 610                                             struct symfile_segment_data *,
 611                                             struct section_offsets *,
 612                                             int, const CORE_ADDR *);
 613 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 614 void free_symfile_segment_data (struct symfile_segment_data *data);
 615
 616 extern struct cleanup *increment_reading_symtab (void);
 617
 618 /* From dwarf2read.c */
 619
 620 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 621    section name (usually from the DWARF standard), while the field COMPRESSED
 622    is the name of compressed sections.  If your object file format doesn't
 623    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 624    the debugging section is not supported, the field NORMAL can be NULL too.
 625    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 626    field.  */
 627
 628 struct dwarf2_section_names {
 629   const char *normal;
 630   const char *compressed;
 631 };
 632
 633 /* List of names for dward2 debugging sections.  Also most object file formats
 634    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 635    due to restrictions.
 636    The table for the standard names is defined in dwarf2read.c.  Please
 637    update all instances of dwarf2_debug_sections if you add a field to this
 638    structure.  It is always safe to use { NULL, NULL } in this case.  */
 639
 640 struct dwarf2_debug_sections {
 641   struct dwarf2_section_names info;
 642   struct dwarf2_section_names abbrev;
 643   struct dwarf2_section_names line;
 644   struct dwarf2_section_names loc;
 645   struct dwarf2_section_names macinfo;
 646   struct dwarf2_section_names macro;
 647   struct dwarf2_section_names str;
 648   struct dwarf2_section_names ranges;
 649   struct dwarf2_section_names types;
 650   struct dwarf2_section_names addr;
 651   struct dwarf2_section_names frame;
 652   struct dwarf2_section_names eh_frame;
 653   struct dwarf2_section_names gdb_index;
 654   /* This field has no meaning, but exists solely to catch changes to
 655      this structure which are not reflected in some instance.  */
 656   int sentinel;
 657 };
 658
 659 extern int dwarf2_has_info (struct objfile *,
 660                             const struct dwarf2_debug_sections *);
 661
 662 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 663 enum dwarf2_section_enum {
 664   DWARF2_DEBUG_FRAME,
 665   DWARF2_EH_FRAME
 666 };
 667
 668 extern void dwarf2_get_section_info (struct objfile *,
 669                                      enum dwarf2_section_enum,
 670                                      asection **, gdb_byte **,
 671                                      bfd_size_type *);
 672
 673 extern int dwarf2_initialize_objfile (struct objfile *);
 674 extern void dwarf2_build_psymtabs (struct objfile *);
 675 extern void dwarf2_build_frame_info (struct objfile *);
 676
 677 void dwarf2_free_objfile (struct objfile *);
 678
 679 /* Whether to use deprecated .gdb_index sections.  */
 680 extern int use_deprecated_index_sections;
 681
 682 /* From mdebugread.c */
 683
 684 /* Hack to force structures to exist before use in parameter list.  */
 685 struct ecoff_debug_hack
 686 {
 687   struct ecoff_debug_swap *a;
 688   struct ecoff_debug_info *b;
 689 };
 690
 691 extern void mdebug_build_psymtabs (struct objfile *,
 692                                    const struct ecoff_debug_swap *,
 693                                    struct ecoff_debug_info *);
 694
 695 extern void elfmdebug_build_psymtabs (struct objfile *,
 696                                       const struct ecoff_debug_swap *,
 697                                       asection *);
 698
 699 #endif /* !defined(SYMFILE_H) */