contrib/gdb-7/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
 216      symtab_to_fullname equal to FULLNAME.
 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_fullname) (struct objfile *objfile,
 221                                         const char *fullname);
 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      Only file extension of returned filename is recognized.  */
 226   const char *(*find_symbol_file) (struct objfile *objfile, const char *name);
 227
 228   /* Find global or static symbols in all tables that are in NAMESPACE
 229      and for which MATCH (symbol name, NAME) == 0, passing each to
 230      CALLBACK, reading in partial symbol tables as needed.  Look
 231      through global symbols if GLOBAL and otherwise static symbols.
 232      Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
 233      found.  After each block is processed, passes NULL to CALLBACK.
 234      MATCH must be weaker than strcmp_iw_ordered in the sense that
 235      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 236      if non-null, must be an ordering relation compatible with
 237      strcmp_iw_ordered in the sense that
 238             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 239      and
 240             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 241      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 242      CALLBACK returns 0 to indicate that the scan should continue, or
 243      non-zero to indicate that the scan should be terminated.  */
 244
 245   void (*map_matching_symbols) (const char *name, domain_enum namespace,
 246                                 struct objfile *, int global,
 247                                 int (*callback) (struct block *,
 248                                                  struct symbol *, void *),
 249                                 void *data,
 250                                 symbol_compare_ftype *match,
 251                                 symbol_compare_ftype *ordered_compare);
 252
 253   /* Expand all symbol tables in OBJFILE matching some criteria.
 254
 255      FILE_MATCHER is called for each file in OBJFILE.  The file name
 256      and the DATA argument are passed to it.  If it returns zero, this
 257      file is skipped.  If FILE_MATCHER is NULL such file is not skipped.
 258      If BASENAMES is non-zero the function should consider only base name of
 259      DATA (passed file name is already only the lbasename part).
 260
 261      Otherwise, if KIND does not match this symbol is skipped.
 262
 263      If even KIND matches, then NAME_MATCHER is called for each symbol
 264      defined in the file.  The symbol "search" name and DATA are passed
 265      to NAME_MATCHER.
 266
 267      If NAME_MATCHER returns zero, then this symbol is skipped.
 268
 269      Otherwise, this symbol's symbol table is expanded.
 270
 271      DATA is user data that is passed unmodified to the callback
 272      functions.  */
 273   void (*expand_symtabs_matching)
 274     (struct objfile *objfile,
 275      int (*file_matcher) (const char *, void *, int basenames),
 276      int (*name_matcher) (const char *, void *),
 277      enum search_domain kind,
 278      void *data);
 279
 280   /* Return the symbol table from OBJFILE that contains PC and
 281      SECTION.  Return NULL if there is no such symbol table.  This
 282      should return the symbol table that contains a symbol whose
 283      address exactly matches PC, or, if there is no exact match, the
 284      symbol table that contains a symbol whose address is closest to
 285      PC.  */
 286   struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
 287                                          struct minimal_symbol *msymbol,
 288                                          CORE_ADDR pc,
 289                                          struct obj_section *section,
 290                                          int warn_if_readin);
 291
 292   /* Call a callback for every file defined in OBJFILE whose symtab is
 293      not already read in.  FUN is the callback.  It is passed the file's
 294      FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
 295      the DATA passed to this function.  */
 296   void (*map_symbol_filenames) (struct objfile *objfile,
 297                                 symbol_filename_ftype *fun, void *data,
 298                                 int need_fullname);
 299 };
 300
 301 /* Structure of functions used for probe support.  If one of these functions
 302    is provided, all must be.  */
 303
 304 struct sym_probe_fns
 305 {
 306   /* If non-NULL, return an array of probe objects.
 307
 308      The returned value does not have to be freed and it has lifetime of the
 309      OBJFILE.  */
 310   VEC (probe_p) *(*sym_get_probes) (struct objfile *);
 311
 312   /* Return the number of arguments available to PROBE.  PROBE will
 313      have come from a call to this objfile's sym_get_probes method.
 314      If you provide an implementation of sym_get_probes, you must
 315      implement this method as well.  */
 316   unsigned (*sym_get_probe_argument_count) (struct probe *probe);
 317
 318   /* Evaluate the Nth argument available to PROBE.  PROBE will have
 319      come from a call to this objfile's sym_get_probes method.  N will
 320      be between 0 and the number of arguments available to this probe.
 321      FRAME is the frame in which the evaluation is done; the frame's
 322      PC will match the address of the probe.  If you provide an
 323      implementation of sym_get_probes, you must implement this method
 324      as well.  */
 325   struct value *(*sym_evaluate_probe_argument) (struct probe *probe,
 326                                                 unsigned n);
 327
 328   /* Compile the Nth probe argument to an agent expression.  PROBE
 329      will have come from a call to this objfile's sym_get_probes
 330      method.  N will be between 0 and the number of arguments
 331      available to this probe.  EXPR and VALUE are the agent expression
 332      that is being updated.  */
 333   void (*sym_compile_to_ax) (struct probe *probe,
 334                              struct agent_expr *expr,
 335                              struct axs_value *value,
 336                              unsigned n);
 337
 338   /* Relocate the probe section of OBJFILE.  */
 339   void (*sym_relocate_probe) (struct objfile *objfile,
 340                               struct section_offsets *new_offsets,
 341                               struct section_offsets *delta);
 342 };
 343
 344 /* Structure to keep track of symbol reading functions for various
 345    object file types.  */
 346
 347 struct sym_fns
 348 {
 349
 350   /* BFD flavour that we handle, or (as a special kludge, see
 351      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 352
 353   enum bfd_flavour sym_flavour;
 354
 355   /* Initializes anything that is global to the entire symbol table.
 356      It is called during symbol_file_add, when we begin debugging an
 357      entirely new program.  */
 358
 359   void (*sym_new_init) (struct objfile *);
 360
 361   /* Reads any initial information from a symbol file, and initializes
 362      the struct sym_fns SF in preparation for sym_read().  It is
 363      called every time we read a symbol file for any reason.  */
 364
 365   void (*sym_init) (struct objfile *);
 366
 367   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 368      (or possibly a symtab).  OBJFILE is the objfile struct for the
 369      file we are reading.  SYMFILE_FLAGS are the flags passed to
 370      symbol_file_add & co.  */
 371
 372   void (*sym_read) (struct objfile *, int);
 373
 374   /* Read the partial symbols for an objfile.  This may be NULL, in which case
 375      gdb has to check other ways if this objfile has any symbols.  This may
 376      only be non-NULL if the objfile actually does have debuginfo available.
 377      */
 378
 379   void (*sym_read_psymbols) (struct objfile *);
 380
 381   /* Called when we are finished with an objfile.  Should do all
 382      cleanup that is specific to the object file format for the
 383      particular objfile.  */
 384
 385   void (*sym_finish) (struct objfile *);
 386
 387   /* This function produces a file-dependent section_offsets
 388      structure, allocated in the objfile's storage, and based on the
 389      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 390      backward compatibility with the higher levels of GDB.  It should
 391      probably be changed to a string, where NULL means the default,
 392      and others are parsed in a file dependent way.  */
 393
 394   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 395
 396   /* This function produces a format-independent description of
 397      the segments of ABFD.  Each segment is a unit of the file
 398      which may be relocated independently.  */
 399
 400   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 401
 402   /* This function should read the linetable from the objfile when
 403      the line table cannot be read while processing the debugging
 404      information.  */
 405
 406   void (*sym_read_linetable) (void);
 407
 408   /* Relocate the contents of a debug section SECTP.  The
 409      contents are stored in BUF if it is non-NULL, or returned in a
 410      malloc'd buffer otherwise.  */
 411
 412   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 413
 414   /* If non-NULL, this objfile has probe support, and all the probe
 415      functions referred to here will be non-NULL.  */
 416   const struct sym_probe_fns *sym_probe_fns;
 417
 418   /* The "quick" (aka partial) symbol functions for this symbol
 419      reader.  */
 420   const struct quick_symbol_functions *qf;
 421 };
 422
 423 extern struct section_addr_info *
 424   build_section_addr_info_from_objfile (const struct objfile *objfile);
 425
 426 extern void relative_addr_info_to_section_offsets
 427   (struct section_offsets *section_offsets, int num_sections,
 428    struct section_addr_info *addrs);
 429
 430 extern void addr_info_make_relative (struct section_addr_info *addrs,
 431                                      bfd *abfd);
 432
 433 /* The default version of sym_fns.sym_offsets for readers that don't
 434    do anything special.  */
 435
 436 extern void default_symfile_offsets (struct objfile *objfile,
 437                                      struct section_addr_info *);
 438
 439 /* The default version of sym_fns.sym_segments for readers that don't
 440    do anything special.  */
 441
 442 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 443
 444 /* The default version of sym_fns.sym_relocate for readers that don't
 445    do anything special.  */
 446
 447 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 448                                            asection *sectp, bfd_byte *buf);
 449
 450 extern struct symtab *allocate_symtab (const char *, struct objfile *)
 451   ATTRIBUTE_NONNULL (1);
 452
 453 extern void add_symtab_fns (const struct sym_fns *);
 454
 455 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 456    syms_from_objfile, symbol_file_add, etc.  */
 457
 458 enum symfile_add_flags
 459   {
 460     /* Be chatty about what you are doing.  */
 461     SYMFILE_VERBOSE = 1 << 1,
 462
 463     /* This is the main symbol file (as opposed to symbol file for dynamically
 464        loaded code).  */
 465     SYMFILE_MAINLINE = 1 << 2,
 466
 467     /* Do not call breakpoint_re_set when adding this symbol file.  */
 468     SYMFILE_DEFER_BP_RESET = 1 << 3,
 469
 470     /* Do not immediately read symbols for this file.  By default,
 471        symbols are read when the objfile is created.  */
 472     SYMFILE_NO_READ = 1 << 4
 473   };
 474
 475 extern void syms_from_objfile (struct objfile *,
 476                                struct section_addr_info *,
 477                                struct section_offsets *, int, int);
 478
 479 extern void new_symfile_objfile (struct objfile *, int);
 480
 481 extern struct objfile *symbol_file_add (char *, int,
 482                                         struct section_addr_info *, int);
 483
 484 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 485                                                  struct section_addr_info *,
 486                                                  int, struct objfile *parent);
 487
 488 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 489
 490 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 491
 492 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 493
 494 extern struct section_addr_info *alloc_section_addr_info (size_t
 495                                                           num_sections);
 496
 497 /* Build (allocate and populate) a section_addr_info struct from an
 498    existing section table.  */
 499
 500 extern struct section_addr_info
 501   *build_section_addr_info_from_section_table (const struct target_section
 502                                                *start,
 503                                                const struct target_section
 504                                                *end);
 505
 506 /* Free all memory allocated by
 507    build_section_addr_info_from_section_table.  */
 508
 509 extern void free_section_addr_info (struct section_addr_info *);
 510
 511
 512                         /*   Variables   */
 513
 514 /* If non-zero, shared library symbols will be added automatically
 515    when the inferior is created, new libraries are loaded, or when
 516    attaching to the inferior.  This is almost always what users will
 517    want to have happen; but for very large programs, the startup time
 518    will be excessive, and so if this is a problem, the user can clear
 519    this flag and then add the shared library symbols as needed.  Note
 520    that there is a potential for confusion, since if the shared
 521    library symbols are not loaded, commands like "info fun" will *not*
 522    report all the functions that are actually present.  */
 523
 524 extern int auto_solib_add;
 525
 526 /* From symfile.c */
 527
 528 extern void set_initial_language (void);
 529
 530 extern void find_lowest_section (bfd *, asection *, void *);
 531
 532 extern bfd *symfile_bfd_open (char *);
 533
 534 extern bfd *gdb_bfd_open_maybe_remote (const char *);
 535
 536 extern int get_section_index (struct objfile *, char *);
 537
 538 /* Utility functions for overlay sections: */
 539 extern enum overlay_debugging_state
 540 {
 541   ovly_off,
 542   ovly_on,
 543   ovly_auto
 544 } overlay_debugging;
 545 extern int overlay_cache_invalid;
 546
 547 /* Return the "mapped" overlay section containing the PC.  */
 548 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 549
 550 /* Return any overlay section containing the PC (even in its LMA
 551    region).  */
 552 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 553
 554 /* Return true if the section is an overlay.  */
 555 extern int section_is_overlay (struct obj_section *);
 556
 557 /* Return true if the overlay section is currently "mapped".  */
 558 extern int section_is_mapped (struct obj_section *);
 559
 560 /* Return true if pc belongs to section's VMA.  */
 561 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 562
 563 /* Return true if pc belongs to section's LMA.  */
 564 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 565
 566 /* Map an address from a section's LMA to its VMA.  */
 567 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 568
 569 /* Map an address from a section's VMA to its LMA.  */
 570 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 571
 572 /* Convert an address in an overlay section (force into VMA range).  */
 573 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 574
 575 /* Load symbols from a file.  */
 576 extern void symbol_file_add_main (char *args, int from_tty);
 577
 578 /* Clear GDB symbol tables.  */
 579 extern void symbol_file_clear (int from_tty);
 580
 581 /* Default overlay update function.  */
 582 extern void simple_overlay_update (struct obj_section *);
 583
 584 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 585                                                  bfd_byte *);
 586
 587 extern int symfile_map_offsets_to_segments (bfd *,
 588                                             struct symfile_segment_data *,
 589                                             struct section_offsets *,
 590                                             int, const CORE_ADDR *);
 591 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 592 void free_symfile_segment_data (struct symfile_segment_data *data);
 593
 594 extern struct cleanup *increment_reading_symtab (void);
 595
 596 /* From dwarf2read.c */
 597
 598 /* Names for a dwarf2 debugging section.  The field NORMAL is the normal
 599    section name (usually from the DWARF standard), while the field COMPRESSED
 600    is the name of compressed sections.  If your object file format doesn't
 601    support compressed sections, the field COMPRESSED can be NULL.  Likewise,
 602    the debugging section is not supported, the field NORMAL can be NULL too.
 603    It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
 604    field.  */
 605
 606 struct dwarf2_section_names {
 607   const char *normal;
 608   const char *compressed;
 609 };
 610
 611 /* List of names for dward2 debugging sections.  Also most object file formats
 612    use the standardized (ie ELF) names, some (eg XCOFF) have customized names
 613    due to restrictions.
 614    The table for the standard names is defined in dwarf2read.c.  Please
 615    update all instances of dwarf2_debug_sections if you add a field to this
 616    structure.  It is always safe to use { NULL, NULL } in this case.  */
 617
 618 struct dwarf2_debug_sections {
 619   struct dwarf2_section_names info;
 620   struct dwarf2_section_names abbrev;
 621   struct dwarf2_section_names line;
 622   struct dwarf2_section_names loc;
 623   struct dwarf2_section_names macinfo;
 624   struct dwarf2_section_names macro;
 625   struct dwarf2_section_names str;
 626   struct dwarf2_section_names ranges;
 627   struct dwarf2_section_names types;
 628   struct dwarf2_section_names addr;
 629   struct dwarf2_section_names frame;
 630   struct dwarf2_section_names eh_frame;
 631   struct dwarf2_section_names gdb_index;
 632   /* This field has no meaning, but exists solely to catch changes to
 633      this structure which are not reflected in some instance.  */
 634   int sentinel;
 635 };
 636
 637 extern int dwarf2_has_info (struct objfile *,
 638                             const struct dwarf2_debug_sections *);
 639
 640 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info.  */
 641 enum dwarf2_section_enum {
 642   DWARF2_DEBUG_FRAME,
 643   DWARF2_EH_FRAME
 644 };
 645
 646 extern void dwarf2_get_section_info (struct objfile *,
 647                                      enum dwarf2_section_enum,
 648                                      asection **, gdb_byte **,
 649                                      bfd_size_type *);
 650
 651 extern int dwarf2_initialize_objfile (struct objfile *);
 652 extern void dwarf2_build_psymtabs (struct objfile *);
 653 extern void dwarf2_build_frame_info (struct objfile *);
 654
 655 void dwarf2_free_objfile (struct objfile *);
 656
 657 /* From mdebugread.c */
 658
 659 extern void mdebug_build_psymtabs (struct objfile *,
 660                                    const struct ecoff_debug_swap *,
 661                                    struct ecoff_debug_info *);
 662
 663 extern void elfmdebug_build_psymtabs (struct objfile *,
 664                                       const struct ecoff_debug_swap *,
 665                                       asection *);
 666
 667 /* From minidebug.c.  */
 668
 669 extern bfd *find_separate_debug_file_in_section (struct objfile *);
 670
 671 #endif /* !defined(SYMFILE_H) */