gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990-2013 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 table's
 163      file name will also work, REAL_PATH is NULL then.  If NAME is
 164      absolute then REAL_PATH is non-NULL absolute file name as resolved
 165      via gdb_realpath from NAME.
 166
 167      If a match is found, the "partial" symbol table is expanded.
 168      Then, this calls iterate_over_some_symtabs (or equivalent) over
 169      all newly-created symbol tables, passing CALLBACK and DATA to it.
 170      The result of this call is returned.  */
 171   int (*map_symtabs_matching_filename) (struct objfile *objfile,
 172                                         const char *name,
 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   /* Print statistics about any indices loaded for OBJFILE.  The
 193      statistics should be printed to gdb_stdout.  This is used for
 194      "maint print statistics".  */
 195   void (*print_stats) (struct objfile *objfile);
 196
 197   /* Dump any indices loaded for OBJFILE.  The dump should go to
 198      gdb_stdout.  This is used for "maint print objfiles".  */
 199   void (*dump) (struct objfile *objfile);
 200
 201   /* This is called by objfile_relocate to relocate any indices loaded
 202      for OBJFILE.  */
 203   void (*relocate) (struct objfile *objfile,
 204                     struct section_offsets *new_offsets,
 205                     struct section_offsets *delta);
 206
 207   /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
 208      the corresponding symbol tables are loaded.  */
 209   void (*expand_symtabs_for_function) (struct objfile *objfile,
 210                                        const char *func_name);
 211
 212   /* Read all symbol tables associated with OBJFILE.  */
 213   void (*expand_all_symtabs) (struct objfile *objfile);
 214
 215   /* Read all symbol tables associated with OBJFILE which have the
 216      file name FILENAME.
 217      This is for the purposes of examining code only, e.g., expand_line_sal.
 218      The routine may ignore debug info that is known to not be useful with
 219      code, e.g., DW_TAG_type_unit for dwarf debug info.  */
 220   void (*expand_symtabs_with_filename) (struct objfile *objfile,
 221                                         const char *filename);
 222
 223   /* Return the file name of the file holding the global symbol in OBJFILE
 224      named NAME.  If no such symbol exists in OBJFILE, return NULL.  */
 225   const char *(*find_symbol_file) (struct objfile *objfile, const char *name);
 226
 227   /* Find global or static symbols in all tables that are in NAMESPACE
 228      and for which MATCH (symbol name, NAME) == 0, passing each to
 229      CALLBACK, reading in partial symbol tables as needed.  Look
 230      through global symbols if GLOBAL and otherwise static symbols.
 231      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 232      found.  After each block is processed, passes NULL to CALLBACK.
 233      MATCH must be weaker than strcmp_iw_ordered in the sense that
 234      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 235      if non-null, must be an ordering relation compatible with
 236      strcmp_iw_ordered in the sense that
 237             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 238      and
 239             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 240      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 241      CALLBACK returns 0 to indicate that the scan should continue, or
 242      non-zero to indicate that the scan should be terminated.  */
 243
 244   void (*map_matching_symbols) (const char *name, domain_enum namespace,
 245                                 struct objfile *, int global,
 246                                 int (*callback) (struct block *,
 247                                                  struct symbol *, void *),
 248                                 void *data,
 249                                 symbol_compare_ftype *match,
 250                                 symbol_compare_ftype *ordered_compare);
 251
 252   /* Expand all symbol tables in OBJFILE matching some criteria.
 253
 254      FILE_MATCHER is called for each file in OBJFILE.  The file name
 255      and the DATA argument are passed to it.  If it returns zero, this
 256      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 257
 258      Otherwise, if KIND does not match this symbol is skipped.
 259
 260      If even KIND matches, then NAME_MATCHER is called for each symbol
 261      defined in the file.  The symbol "search" name and DATA are passed
 262      to NAME_MATCHER.
 263
 264      If NAME_MATCHER returns zero, then this symbol is skipped.
 265
 266      Otherwise, this symbol's symbol table is expanded.
 267
 268      DATA is user data that is passed unmodified to the callback
 269      functions.  */
 270   void (*expand_symtabs_matching)
 271     (struct objfile *objfile,
 272      int (*file_matcher) (const char *, void *),
 273      int (*name_matcher) (const char *, void *),
 274      enum search_domain kind,
 275      void *data);
 276
 277   /* Return the symbol table from OBJFILE that contains PC and
 278      SECTION.  Return NULL if there is no such symbol table.  This
 279      should return the symbol table that contains a symbol whose
 280      address exactly matches PC, or, if there is no exact match, the
 281      symbol table that contains a symbol whose address is closest to
 282      PC.  */
 283   struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
 284                                          struct minimal_symbol *msymbol,
 285                                          CORE_ADDR pc,
 286                                          struct obj_section *section,
 287                                          int warn_if_readin);
 288
 289   /* Call a callback for every file defined in OBJFILE whose symtab is
 290      not already read in.  FUN is the callback.  It is passed the file's
 291      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 292      the DATA passed to this function.  */
 293   void (*map_symbol_filenames) (struct objfile *objfile,
 294                                 symbol_filename_ftype *fun, void *data,
 295                                 int need_fullname);
 296 };
 297
 298 /* Structure of functions used for probe support.  If one of these functions
 299    is provided, all must be.  */
 300
 301 struct sym_probe_fns
 302 {
 303   /* If non-NULL, return an array of probe objects.
 304
 305      The returned value does not have to be freed and it has lifetime of the
 306      OBJFILE.  */
 307   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 308
 309   /* Return the number of arguments available to PROBE.  PROBE will
 310      have come from a call to this objfile's sym_get_probes method.
 311      If you provide an implementation of sym_get_probes, you must
 312      implement this method as well.  */
 313   unsigned (*sym_get_probe_argument_count) (struct probe *probe);
 314
 315   /* Evaluate the Nth argument available to PROBE.  PROBE will have
 316      come from a call to this objfile's sym_get_probes method.  N will
 317      be between 0 and the number of arguments available to this probe.
 318      FRAME is the frame in which the evaluation is done; the frame's
 319      PC will match the address of the probe.  If you provide an
 320      implementation of sym_get_probes, you must implement this method
 321      as well.  */
 322   struct value *(*sym_evaluate_probe_argument) (struct probe *probe,
 323                                                 unsigned n);
 324
 325   /* Compile the Nth probe argument to an agent expression.  PROBE
 326      will have come from a call to this objfile's sym_get_probes
 327      method.  N will be between 0 and the number of arguments
 328      available to this probe.  EXPR and VALUE are the agent expression
 329      that is being updated.  */
 330   void (*sym_compile_to_ax) (struct probe *probe,
 331                              struct agent_expr *expr,
 332                              struct axs_value *value,
 333                              unsigned n);
 334
 335   /* Relocate the probe section of OBJFILE.  */
 336   void (*sym_relocate_probe) (struct objfile *objfile,
 337                               struct section_offsets *new_offsets,
 338                               struct section_offsets *delta);
 339 };
 340
 341 /* Structure to keep track of symbol reading functions for various
 342    object file types.  */
 343
 344 struct sym_fns
 345 {
 346
 347   /* BFD flavour that we handle, or (as a special kludge, see
 348      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 349
 350   enum bfd_flavour sym_flavour;
 351
 352   /* Initializes anything that is global to the entire symbol table.
 353      It is called during symbol_file_add, when we begin debugging an
 354      entirely new program.  */
 355
 356   void (*sym_new_init) (struct objfile *);
 357
 358   /* Reads any initial information from a symbol file, and initializes
 359      the struct sym_fns SF in preparation for sym_read().  It is
 360      called every time we read a symbol file for any reason.  */
 361
 362   void (*sym_init) (struct objfile *);
 363
 364   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 365      (or possibly a symtab).  OBJFILE is the objfile struct for the
 366      file we are reading.  SYMFILE_FLAGS are the flags passed to
 367      symbol_file_add & co.  */
 368
 369   void (*sym_read) (struct objfile *, int);
 370
 371   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 372      gdb has to check other ways if this objfile has any symbols.  This may
 373      only be non-NULL if the objfile actually does have debuginfo available.
 374      */
 375
 376   void (*sym_read_psymbols) (struct objfile *);
 377
 378   /* Called when we are finished with an objfile.  Should do all
 379      cleanup that is specific to the object file format for the
 380      particular objfile.  */
 381
 382   void (*sym_finish) (struct objfile *);
 383
 384   /* This function produces a file-dependent section_offsets
 385      structure, allocated in the objfile's storage, and based on the
 386      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 387      backward compatibility with the higher levels of GDB.  It should
 388      probably be changed to a string, where NULL means the default,
 389      and others are parsed in a file dependent way.  */
 390
 391   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 392
 393   /* This function produces a format-independent description of
 394      the segments of ABFD.  Each segment is a unit of the file
 395      which may be relocated independently.  */
 396
 397   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 398
 399   /* This function should read the linetable from the objfile when
 400      the line table cannot be read while processing the debugging
 401      information.  */
 402
 403   void (*sym_read_linetable) (void);
 404
 405   /* Relocate the contents of a debug section SECTP.  The
 406      contents are stored in BUF if it is non-NULL, or returned in a
 407      malloc'd buffer otherwise.  */
 408
 409   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 410
 411   /* If non-NULL, this objfile has probe support, and all the probe
 412      functions referred to here will be non-NULL.  */
 413   const struct sym_probe_fns *sym_probe_fns;
 414
 415   /* The "quick" (aka partial) symbol functions for this symbol
 416      reader.  */
 417   const struct quick_symbol_functions *qf;
 418 };
 419
 420 extern struct section_addr_info *
 421   build_section_addr_info_from_objfile (const struct objfile *objfile);
 422
 423 extern void relative_addr_info_to_section_offsets
 424   (struct section_offsets *section_offsets, int num_sections,
 425    struct section_addr_info *addrs);
 426
 427 extern void addr_info_make_relative (struct section_addr_info *addrs,
 428                                      bfd *abfd);
 429
 430 /* The default version of sym_fns.sym_offsets for readers that don't
 431    do anything special.  */
 432
 433 extern void default_symfile_offsets (struct objfile *objfile,
 434                                      struct section_addr_info *);
 435
 436 /* The default version of sym_fns.sym_segments for readers that don't
 437    do anything special.  */
 438
 439 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 440
 441 /* The default version of sym_fns.sym_relocate for readers that don't
 442    do anything special.  */
 443
 444 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 445                                            asection *sectp, bfd_byte *buf);
 446
 447 extern struct symtab *allocate_symtab (const char *, struct objfile *)
 448   ATTRIBUTE_NONNULL (1);
 449
 450 extern void add_symtab_fns (const struct sym_fns *);
 451
 452 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 453    syms_from_objfile, symbol_file_add, etc.  */
 454
 455 enum symfile_add_flags
 456   {
 457     /* Be chatty about what you are doing.  */
 458     SYMFILE_VERBOSE = 1 << 1,
 459
 460     /* This is the main symbol file (as opposed to symbol file for dynamically
 461        loaded code).  */
 462     SYMFILE_MAINLINE = 1 << 2,
 463
 464     /* Do not call breakpoint_re_set when adding this symbol file.  */
 465     SYMFILE_DEFER_BP_RESET = 1 << 3,
 466
 467     /* Do not immediately read symbols for this file.  By default,
 468        symbols are read when the objfile is created.  */
 469     SYMFILE_NO_READ = 1 << 4
 470   };
 471
 472 extern void syms_from_objfile (struct objfile *,
 473                                struct section_addr_info *,
 474                                struct section_offsets *, int, int);
 475
 476 extern void new_symfile_objfile (struct objfile *, int);
 477
 478 extern struct objfile *symbol_file_add (char *, int,
 479                                         struct section_addr_info *, int);
 480
 481 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 482                                                  struct section_addr_info *,
 483                                                  int, struct objfile *parent);
 484
 485 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 486
 487 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 488
 489 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 490
 491 extern struct section_addr_info *alloc_section_addr_info (size_t
 492                                                           num_sections);
 493
 494 /* Build (allocate and populate) a section_addr_info struct from an
 495    existing section table.  */
 496
 497 extern struct section_addr_info
 498   *build_section_addr_info_from_section_table (const struct target_section
 499                                                *start,
 500                                                const struct target_section
 501                                                *end);
 502
 503 /* Free all memory allocated by
 504    build_section_addr_info_from_section_table.  */
 505
 506 extern void free_section_addr_info (struct section_addr_info *);
 507
 508
 509                         /*   Variables   */
 510
 511 /* If non-zero, shared library symbols will be added automatically
 512    when the inferior is created, new libraries are loaded, or when
 513    attaching to the inferior.  This is almost always what users will
 514    want to have happen; but for very large programs, the startup time
 515    will be excessive, and so if this is a problem, the user can clear
 516    this flag and then add the shared library symbols as needed.  Note
 517    that there is a potential for confusion, since if the shared
 518    library symbols are not loaded, commands like "info fun" will *not*
 519    report all the functions that are actually present.  */
 520
 521 extern int auto_solib_add;
 522
 523 /* From symfile.c */
 524
 525 extern void set_initial_language (void);
 526
 527 extern void find_lowest_section (bfd *, asection *, void *);
 528
 529 extern bfd *symfile_bfd_open (char *);
 530
 531 extern bfd *gdb_bfd_open_maybe_remote (const char *);
 532
 533 extern int get_section_index (struct objfile *, char *);
 534
 535 /* Utility functions for overlay sections: */
 536 extern enum overlay_debugging_state
 537 {
 538   ovly_off,
 539   ovly_on,
 540   ovly_auto
 541 } overlay_debugging;
 542 extern int overlay_cache_invalid;
 543
 544 /* Return the "mapped" overlay section containing the PC.  */
 545 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 546
 547 /* Return any overlay section containing the PC (even in its LMA
 548    region).  */
 549 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 550
 551 /* Return true if the section is an overlay.  */
 552 extern int section_is_overlay (struct obj_section *);
 553
 554 /* Return true if the overlay section is currently "mapped".  */
 555 extern int section_is_mapped (struct obj_section *);
 556
 557 /* Return true if pc belongs to section's VMA.  */
 558 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 559
 560 /* Return true if pc belongs to section's LMA.  */
 561 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 562
 563 /* Map an address from a section's LMA to its VMA.  */
 564 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 565
 566 /* Map an address from a section's VMA to its LMA.  */
 567 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 568
 569 /* Convert an address in an overlay section (force into VMA range).  */
 570 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 571
 572 /* Load symbols from a file.  */
 573 extern void symbol_file_add_main (char *args, int from_tty);
 574
 575 /* Clear GDB symbol tables.  */
 576 extern void symbol_file_clear (int from_tty);
 577
 578 /* Default overlay update function.  */
 579 extern void simple_overlay_update (struct obj_section *);
 580
 581 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 582                                                  bfd_byte *);
 583
 584 extern int symfile_map_offsets_to_segments (bfd *,
 585                                             struct symfile_segment_data *,
 586                                             struct section_offsets *,
 587                                             int, const CORE_ADDR *);
 588 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 589 void free_symfile_segment_data (struct symfile_segment_data *data);
 590
 591 extern struct cleanup *increment_reading_symtab (void);
 592
 593 /* From dwarf2read.c */
 594
 595 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 596    section name (usually from the DWARF standard), while the field COMPRESSED
 597    is the name of compressed sections.  If your object file format doesn't
 598    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 599    the debugging section is not supported, the field NORMAL can be NULL too.
 600    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 601    field.  */
 602
 603 struct dwarf2_section_names {
 604   const char *normal;
 605   const char *compressed;
 606 };
 607
 608 /* List of names for dward2 debugging sections.  Also most object file formats
 609    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 610    due to restrictions.
 611    The table for the standard names is defined in dwarf2read.c.  Please
 612    update all instances of dwarf2_debug_sections if you add a field to this
 613    structure.  It is always safe to use { NULL, NULL } in this case.  */
 614
 615 struct dwarf2_debug_sections {
 616   struct dwarf2_section_names info;
 617   struct dwarf2_section_names abbrev;
 618   struct dwarf2_section_names line;
 619   struct dwarf2_section_names loc;
 620   struct dwarf2_section_names macinfo;
 621   struct dwarf2_section_names macro;
 622   struct dwarf2_section_names str;
 623   struct dwarf2_section_names ranges;
 624   struct dwarf2_section_names types;
 625   struct dwarf2_section_names addr;
 626   struct dwarf2_section_names frame;
 627   struct dwarf2_section_names eh_frame;
 628   struct dwarf2_section_names gdb_index;
 629   /* This field has no meaning, but exists solely to catch changes to
 630      this structure which are not reflected in some instance.  */
 631   int sentinel;
 632 };
 633
 634 extern int dwarf2_has_info (struct objfile *,
 635                             const struct dwarf2_debug_sections *);
 636
 637 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 638 enum dwarf2_section_enum {
 639   DWARF2_DEBUG_FRAME,
 640   DWARF2_EH_FRAME
 641 };
 642
 643 extern void dwarf2_get_section_info (struct objfile *,
 644                                      enum dwarf2_section_enum,
 645                                      asection **, gdb_byte **,
 646                                      bfd_size_type *);
 647
 648 extern int dwarf2_initialize_objfile (struct objfile *);
 649 extern void dwarf2_build_psymtabs (struct objfile *);
 650 extern void dwarf2_build_frame_info (struct objfile *);
 651
 652 void dwarf2_free_objfile (struct objfile *);
 653
 654 /* From mdebugread.c */
 655
 656 extern void mdebug_build_psymtabs (struct objfile *,
 657                                    const struct ecoff_debug_swap *,
 658                                    struct ecoff_debug_info *);
 659
 660 extern void elfmdebug_build_psymtabs (struct objfile *,
 661                                       const struct ecoff_debug_swap *,
 662                                       asection *);
 663
 664 /* From minidebug.c.  */
 665
 666 extern bfd *find_separate_debug_file_in_section (struct objfile *);
 667
 668 #endif /* !defined(SYMFILE_H) */