gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   4    2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010
   5    Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #if !defined (SYMFILE_H)
  23 #define SYMFILE_H
  24
  25 /* This file requires that you first include "bfd.h".  */
  26 #include "symtab.h"
  27
  28 /* Opaque declarations.  */
  29 struct target_section;
  30 struct objfile;
  31 struct obj_section;
  32 struct obstack;
  33 struct block;
  34
  35 /* Partial symbols are stored in the psymbol_cache and pointers to
  36    them are kept in a dynamically grown array that is obtained from
  37    malloc and grown as necessary via realloc.  Each objfile typically
  38    has two of these, one for global symbols and one for static
  39    symbols.  Although this adds a level of indirection for storing or
  40    accessing the partial symbols, it allows us to throw away duplicate
  41    psymbols and set all pointers to the single saved instance.  */
  42
  43 struct psymbol_allocation_list
  44 {
  45
  46   /* Pointer to beginning of dynamically allocated array of pointers
  47      to partial symbols.  The array is dynamically expanded as
  48      necessary to accommodate more pointers.  */
  49
  50   struct partial_symbol **list;
  51
  52   /* Pointer to next available slot in which to store a pointer to a
  53      partial symbol.  */
  54
  55   struct partial_symbol **next;
  56
  57   /* Number of allocated pointer slots in current dynamic array (not
  58      the number of bytes of storage).  The "next" pointer will always
  59      point somewhere between list[0] and list[size], and when at
  60      list[size] the array will be expanded on the next attempt to
  61      store a pointer.  */
  62
  63   int size;
  64 };
  65
  66 /* Define an array of addresses to accommodate non-contiguous dynamic
  67    loading of modules.  This is for use when entering commands, so we
  68    can keep track of the section names until we read the file and can
  69    map them to bfd sections.  This structure is also used by solib.c
  70    to communicate the section addresses in shared objects to
  71    symbol_file_add ().  */
  72
  73 struct section_addr_info
  74 {
  75   /* The number of sections for which address information is
  76      available.  */
  77   size_t num_sections;
  78   /* Sections whose names are file format dependent. */
  79   struct other_sections
  80   {
  81     CORE_ADDR addr;
  82     char *name;
  83     int sectindex;
  84   } other[1];
  85 };
  86
  87
  88 /* A table listing the load segments in a symfile, and which segment
  89    each BFD section belongs to.  */
  90 struct symfile_segment_data
  91 {
  92   /* How many segments are present in this file.  If there are
  93      two, the text segment is the first one and the data segment
  94      is the second one.  */
  95   int num_segments;
  96
  97   /* If NUM_SEGMENTS is greater than zero, the original base address
  98      of each segment.  */
  99   CORE_ADDR *segment_bases;
 100
 101   /* If NUM_SEGMENTS is greater than zero, the memory size of each
 102      segment.  */
 103   CORE_ADDR *segment_sizes;
 104
 105   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
 106      recording which segment contains each BFD section.
 107      SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
 108      S, or zero if it is not in any segment.  */
 109   int *segment_info;
 110 };
 111
 112 /* Structure to keep track of symbol reading functions for various
 113    object file types.  */
 114
 115 struct sym_fns
 116 {
 117
 118   /* BFD flavour that we handle, or (as a special kludge, see
 119      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 120
 121   enum bfd_flavour sym_flavour;
 122
 123   /* Initializes anything that is global to the entire symbol table.
 124      It is called during symbol_file_add, when we begin debugging an
 125      entirely new program.  */
 126
 127   void (*sym_new_init) (struct objfile *);
 128
 129   /* Reads any initial information from a symbol file, and initializes
 130      the struct sym_fns SF in preparation for sym_read().  It is
 131      called every time we read a symbol file for any reason.  */
 132
 133   void (*sym_init) (struct objfile *);
 134
 135   /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
 136      (or possibly a symtab).  OBJFILE is the objfile struct for the
 137      file we are reading.  SYMFILE_FLAGS are the flags passed to
 138      symbol_file_add & co.  */
 139
 140   void (*sym_read) (struct objfile *, int);
 141
 142   /* Called when we are finished with an objfile.  Should do all
 143      cleanup that is specific to the object file format for the
 144      particular objfile.  */
 145
 146   void (*sym_finish) (struct objfile *);
 147
 148   /* This function produces a file-dependent section_offsets
 149      structure, allocated in the objfile's storage, and based on the
 150      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 151      backward compatibility with the higher levels of GDB.  It should
 152      probably be changed to a string, where NULL means the default,
 153      and others are parsed in a file dependent way.  */
 154
 155   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 156
 157   /* This function produces a format-independent description of
 158      the segments of ABFD.  Each segment is a unit of the file
 159      which may be relocated independently.  */
 160
 161   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 162
 163   /* This function should read the linetable from the objfile when
 164      the line table cannot be read while processing the debugging
 165      information.  */
 166   void (*sym_read_linetable) (void);
 167
 168   /* Finds the next struct sym_fns.  They are allocated and
 169      initialized in whatever module implements the functions pointed
 170      to; an initializer calls add_symtab_fns to add them to the global
 171      chain.  */
 172
 173   struct sym_fns *next;
 174
 175 };
 176
 177 extern void relative_addr_info_to_section_offsets
 178   (struct section_offsets *section_offsets, int num_sections,
 179    struct section_addr_info *addrs);
 180
 181 extern void addr_info_make_relative (struct section_addr_info *addrs,
 182                                      bfd *abfd);
 183
 184 /* The default version of sym_fns.sym_offsets for readers that don't
 185    do anything special.  */
 186
 187 extern void default_symfile_offsets (struct objfile *objfile,
 188                                      struct section_addr_info *);
 189
 190 /* The default version of sym_fns.sym_segments for readers that don't
 191    do anything special.  */
 192
 193 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 194
 195 extern void extend_psymbol_list (struct psymbol_allocation_list *,
 196                                  struct objfile *);
 197
 198 /* Add any kind of symbol to a psymbol_allocation_list.  */
 199
 200 /* #include "demangle.h" */
 201
 202 extern const
 203 struct partial_symbol *add_psymbol_to_list (char *, int, int, domain_enum,
 204                                             enum address_class,
 205                                             struct psymbol_allocation_list *,
 206                                             long, CORE_ADDR,
 207                                             enum language, struct objfile *);
 208
 209 extern void init_psymbol_list (struct objfile *, int);
 210
 211 extern void sort_pst_symbols (struct partial_symtab *);
 212
 213 extern struct symtab *allocate_symtab (char *, struct objfile *);
 214
 215 extern int free_named_symtabs (char *);
 216
 217 extern void add_symtab_fns (struct sym_fns *);
 218
 219 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 220    syms_from_objfile, symbol_file_add, etc.  */
 221
 222 enum symfile_add_flags
 223   {
 224     /* Be chatty about what you are doing.  */
 225     SYMFILE_VERBOSE = 1 << 1,
 226
 227     /* This is the main symbol file (as opposed to symbol file for dynamically
 228        loaded code).  */
 229     SYMFILE_MAINLINE = 1 << 2,
 230
 231     /* Do not call breakpoint_re_set when adding this symbol file.  */
 232     SYMFILE_DEFER_BP_RESET = 1 << 3
 233   };
 234
 235 extern void syms_from_objfile (struct objfile *,
 236                                struct section_addr_info *,
 237                                struct section_offsets *, int, int);
 238
 239 extern void new_symfile_objfile (struct objfile *, int);
 240
 241 extern struct objfile *symbol_file_add (char *, int,
 242                                         struct section_addr_info *, int);
 243
 244 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 245                                                  struct section_addr_info *,
 246                                                  int);
 247
 248 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 249
 250 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 251
 252 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 253
 254 extern struct section_addr_info *alloc_section_addr_info (size_t
 255                                                           num_sections);
 256
 257 /* Return a freshly allocated copy of ADDRS.  The section names, if
 258    any, are also freshly allocated copies of those in ADDRS.  */
 259 extern struct section_addr_info *(copy_section_addr_info
 260                                   (struct section_addr_info *addrs));
 261
 262 /* Build (allocate and populate) a section_addr_info struct from an
 263    existing section table.  */
 264
 265 extern struct section_addr_info
 266   *build_section_addr_info_from_section_table (const struct target_section
 267                                                *start,
 268                                                const struct target_section
 269                                                *end);
 270
 271 /* Free all memory allocated by
 272    build_section_addr_info_from_section_table.  */
 273
 274 extern void free_section_addr_info (struct section_addr_info *);
 275
 276
 277 extern struct partial_symtab *start_psymtab_common (struct objfile *,
 278                                                     struct section_offsets *,
 279                                                     const char *, CORE_ADDR,
 280                                                     struct partial_symbol **,
 281                                                     struct partial_symbol **);
 282
 283 /* Make a copy of the string at PTR with SIZE characters in the symbol
 284    obstack (and add a null character at the end in the copy).  Returns
 285    the address of the copy.  */
 286
 287 extern char *obsavestring (const char *, int, struct obstack *);
 288
 289 /* Concatenate strings S1, S2 and S3; return the new string.  Space is
 290    found in the OBSTACKP  */
 291
 292 extern char *obconcat (struct obstack *obstackp, const char *, const char *,
 293                        const char *);
 294
 295                         /*   Variables   */
 296
 297 /* If non-zero, shared library symbols will be added automatically
 298    when the inferior is created, new libraries are loaded, or when
 299    attaching to the inferior.  This is almost always what users will
 300    want to have happen; but for very large programs, the startup time
 301    will be excessive, and so if this is a problem, the user can clear
 302    this flag and then add the shared library symbols as needed.  Note
 303    that there is a potential for confusion, since if the shared
 304    library symbols are not loaded, commands like "info fun" will *not*
 305    report all the functions that are actually present.  */
 306
 307 extern int auto_solib_add;
 308
 309 /* For systems that support it, a threshold size in megabytes.  If
 310    automatically adding a new library's symbol table to those already
 311    known to the debugger would cause the total shared library symbol
 312    size to exceed this threshhold, then the shlib's symbols are not
 313    added.  The threshold is ignored if the user explicitly asks for a
 314    shlib to be added, such as when using the "sharedlibrary" command.  */
 315
 316 extern int auto_solib_limit;
 317
 318 /* From symfile.c */
 319
 320 extern void set_initial_language (void);
 321
 322 extern struct partial_symtab *allocate_psymtab (const char *,
 323                                                 struct objfile *);
 324
 325 extern void discard_psymtab (struct partial_symtab *);
 326
 327 extern void find_lowest_section (bfd *, asection *, void *);
 328
 329 extern bfd *symfile_bfd_open (char *);
 330
 331 extern bfd *bfd_open_maybe_remote (const char *);
 332
 333 extern int get_section_index (struct objfile *, char *);
 334
 335 /* Utility functions for overlay sections: */
 336 extern enum overlay_debugging_state
 337 {
 338   ovly_off,
 339   ovly_on,
 340   ovly_auto
 341 } overlay_debugging;
 342 extern int overlay_cache_invalid;
 343
 344 /* Return the "mapped" overlay section containing the PC.  */
 345 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 346
 347 /* Return any overlay section containing the PC (even in its LMA
 348    region).  */
 349 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 350
 351 /* Return true if the section is an overlay.  */
 352 extern int section_is_overlay (struct obj_section *);
 353
 354 /* Return true if the overlay section is currently "mapped".  */
 355 extern int section_is_mapped (struct obj_section *);
 356
 357 /* Return true if pc belongs to section's VMA.  */
 358 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 359
 360 /* Return true if pc belongs to section's LMA.  */
 361 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 362
 363 /* Map an address from a section's LMA to its VMA.  */
 364 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 365
 366 /* Map an address from a section's VMA to its LMA.  */
 367 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 368
 369 /* Convert an address in an overlay section (force into VMA range).  */
 370 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 371
 372 /* Load symbols from a file.  */
 373 extern void symbol_file_add_main (char *args, int from_tty);
 374
 375 /* Clear GDB symbol tables.  */
 376 extern void symbol_file_clear (int from_tty);
 377
 378 /* Default overlay update function.  */
 379 extern void simple_overlay_update (struct obj_section *);
 380
 381 extern bfd_byte *symfile_relocate_debug_section (bfd *abfd, asection *sectp,
 382                                                  bfd_byte * buf);
 383
 384 extern int symfile_map_offsets_to_segments (bfd *,
 385                                             struct symfile_segment_data *,
 386                                             struct section_offsets *,
 387                                             int, const CORE_ADDR *);
 388 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 389 void free_symfile_segment_data (struct symfile_segment_data *data);
 390
 391 /* From dwarf2read.c */
 392
 393 extern int dwarf2_has_info (struct objfile *);
 394
 395 extern void dwarf2_build_psymtabs (struct objfile *);
 396 extern void dwarf2_build_frame_info (struct objfile *);
 397
 398 void dwarf2_free_objfile (struct objfile *);
 399
 400 /* From mdebugread.c */
 401
 402 /* Hack to force structures to exist before use in parameter list.  */
 403 struct ecoff_debug_hack
 404 {
 405   struct ecoff_debug_swap *a;
 406   struct ecoff_debug_info *b;
 407 };
 408
 409 extern void mdebug_build_psymtabs (struct objfile *,
 410                                    const struct ecoff_debug_swap *,
 411                                    struct ecoff_debug_info *);
 412
 413 extern void elfmdebug_build_psymtabs (struct objfile *,
 414                                       const struct ecoff_debug_swap *,
 415                                       asection *);
 416
 417 #endif /* !defined(SYMFILE_H) */