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