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
   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, mainline) Reads a symbol file into a psymtab
 136      (or possibly a symtab).  OBJFILE is the objfile struct for the
 137      file we are reading.  MAINLINE is 1 if this is the main symbol
 138      table being read, and 0 if a secondary symbol file (e.g. shared
 139      library or dynamically loaded file) is being read.  */
 140
 141   void (*sym_read) (struct objfile *, int);
 142
 143   /* Called when we are finished with an objfile.  Should do all
 144      cleanup that is specific to the object file format for the
 145      particular objfile.  */
 146
 147   void (*sym_finish) (struct objfile *);
 148
 149   /* This function produces a file-dependent section_offsets
 150      structure, allocated in the objfile's storage, and based on the
 151      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 152      backward compatibility with the higher levels of GDB.  It should
 153      probably be changed to a string, where NULL means the default,
 154      and others are parsed in a file dependent way.  */
 155
 156   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 157
 158   /* This function produces a format-independent description of
 159      the segments of ABFD.  Each segment is a unit of the file
 160      which may be relocated independently.  */
 161
 162   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 163
 164   /* This function should read the linetable from the objfile when
 165      the line table cannot be read while processing the debugging
 166      information.  */
 167   void (*sym_read_linetable) (void);
 168
 169   /* Finds the next struct sym_fns.  They are allocated and
 170      initialized in whatever module implements the functions pointed
 171      to; an initializer calls add_symtab_fns to add them to the global
 172      chain.  */
 173
 174   struct sym_fns *next;
 175
 176 };
 177
 178 /* The default version of sym_fns.sym_offsets for readers that don't
 179    do anything special.  */
 180
 181 extern void default_symfile_offsets (struct objfile *objfile,
 182                                      struct section_addr_info *);
 183
 184 /* The default version of sym_fns.sym_segments for readers that don't
 185    do anything special.  */
 186
 187 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 188
 189 extern void extend_psymbol_list (struct psymbol_allocation_list *,
 190                                  struct objfile *);
 191
 192 /* Add any kind of symbol to a psymbol_allocation_list.  */
 193
 194 /* #include "demangle.h" */
 195
 196 extern const
 197 struct partial_symbol *add_psymbol_to_list (char *, int, domain_enum,
 198                                             enum address_class,
 199                                             struct psymbol_allocation_list *,
 200                                             long, CORE_ADDR,
 201                                             enum language, struct objfile *);
 202
 203 extern void init_psymbol_list (struct objfile *, int);
 204
 205 extern void sort_pst_symbols (struct partial_symtab *);
 206
 207 extern struct symtab *allocate_symtab (char *, struct objfile *);
 208
 209 extern int free_named_symtabs (char *);
 210
 211 extern void add_symtab_fns (struct sym_fns *);
 212
 213 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 214    syms_from_objfile, symbol_file_add, etc.  */
 215
 216 enum symfile_add_flags
 217   {
 218     /* Be chatty about what you are doing.  */
 219     SYMFILE_VERBOSE = 1 << 1,
 220
 221     /* This is the main symbol file (as opposed to symbol file for dynamically
 222        loaded code).  */
 223     SYMFILE_MAINLINE = 1 << 2,
 224
 225     /* Do not call breakpoint_re_set when adding this symbol file.  */
 226     SYMFILE_DEFER_BP_RESET = 1 << 3
 227   };
 228
 229 extern void syms_from_objfile (struct objfile *,
 230                                struct section_addr_info *,
 231                                struct section_offsets *, int, int);
 232
 233 extern void new_symfile_objfile (struct objfile *, int);
 234
 235 extern struct objfile *symbol_file_add (char *, int,
 236                                         struct section_addr_info *, int);
 237
 238 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 239                                                  struct section_addr_info *,
 240                                                  int);
 241
 242 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 243
 244 extern struct section_addr_info *alloc_section_addr_info (size_t
 245                                                           num_sections);
 246
 247 /* Return a freshly allocated copy of ADDRS.  The section names, if
 248    any, are also freshly allocated copies of those in ADDRS.  */
 249 extern struct section_addr_info *(copy_section_addr_info
 250                                   (struct section_addr_info *addrs));
 251
 252 /* Build (allocate and populate) a section_addr_info struct from an
 253    existing section table.  */
 254
 255 extern struct section_addr_info
 256   *build_section_addr_info_from_section_table (const struct target_section
 257                                                *start,
 258                                                const struct target_section
 259                                                *end);
 260
 261 /* Free all memory allocated by
 262    build_section_addr_info_from_section_table.  */
 263
 264 extern void free_section_addr_info (struct section_addr_info *);
 265
 266
 267 extern struct partial_symtab *start_psymtab_common (struct objfile *,
 268                                                     struct section_offsets *,
 269                                                     char *, CORE_ADDR,
 270                                                     struct partial_symbol **,
 271                                                     struct partial_symbol **);
 272
 273 /* Make a copy of the string at PTR with SIZE characters in the symbol
 274    obstack (and add a null character at the end in the copy).  Returns
 275    the address of the copy.  */
 276
 277 extern char *obsavestring (const char *, int, struct obstack *);
 278
 279 /* Concatenate strings S1, S2 and S3; return the new string.  Space is
 280    found in the OBSTACKP  */
 281
 282 extern char *obconcat (struct obstack *obstackp, const char *, const char *,
 283                        const char *);
 284
 285                         /*   Variables   */
 286
 287 /* If non-zero, shared library symbols will be added automatically
 288    when the inferior is created, new libraries are loaded, or when
 289    attaching to the inferior.  This is almost always what users will
 290    want to have happen; but for very large programs, the startup time
 291    will be excessive, and so if this is a problem, the user can clear
 292    this flag and then add the shared library symbols as needed.  Note
 293    that there is a potential for confusion, since if the shared
 294    library symbols are not loaded, commands like "info fun" will *not*
 295    report all the functions that are actually present.  */
 296
 297 extern int auto_solib_add;
 298
 299 /* For systems that support it, a threshold size in megabytes.  If
 300    automatically adding a new library's symbol table to those already
 301    known to the debugger would cause the total shared library symbol
 302    size to exceed this threshhold, then the shlib's symbols are not
 303    added.  The threshold is ignored if the user explicitly asks for a
 304    shlib to be added, such as when using the "sharedlibrary" command.  */
 305
 306 extern int auto_solib_limit;
 307
 308 /* From symfile.c */
 309
 310 extern void set_initial_language (void);
 311
 312 extern struct partial_symtab *allocate_psymtab (char *, struct objfile *);
 313
 314 extern void discard_psymtab (struct partial_symtab *);
 315
 316 extern void find_lowest_section (bfd *, asection *, void *);
 317
 318 extern bfd *symfile_bfd_open (char *);
 319
 320 extern int get_section_index (struct objfile *, char *);
 321
 322 /* Utility functions for overlay sections: */
 323 extern enum overlay_debugging_state
 324 {
 325   ovly_off,
 326   ovly_on,
 327   ovly_auto
 328 } overlay_debugging;
 329 extern int overlay_cache_invalid;
 330
 331 /* Return the "mapped" overlay section containing the PC.  */
 332 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 333
 334 /* Return any overlay section containing the PC (even in its LMA
 335    region).  */
 336 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 337
 338 /* Return true if the section is an overlay.  */
 339 extern int section_is_overlay (struct obj_section *);
 340
 341 /* Return true if the overlay section is currently "mapped".  */
 342 extern int section_is_mapped (struct obj_section *);
 343
 344 /* Return true if pc belongs to section's VMA.  */
 345 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 346
 347 /* Return true if pc belongs to section's LMA.  */
 348 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 349
 350 /* Map an address from a section's LMA to its VMA.  */
 351 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 352
 353 /* Map an address from a section's VMA to its LMA.  */
 354 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 355
 356 /* Convert an address in an overlay section (force into VMA range).  */
 357 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 358
 359 /* Load symbols from a file.  */
 360 extern void symbol_file_add_main (char *args, int from_tty);
 361
 362 /* Clear GDB symbol tables.  */
 363 extern void symbol_file_clear (int from_tty);
 364
 365 /* Default overlay update function.  */
 366 extern void simple_overlay_update (struct obj_section *);
 367
 368 extern bfd_byte *symfile_relocate_debug_section (bfd *abfd, asection *sectp,
 369                                                  bfd_byte * buf);
 370
 371 extern int symfile_map_offsets_to_segments (bfd *,
 372                                             struct symfile_segment_data *,
 373                                             struct section_offsets *,
 374                                             int, const CORE_ADDR *);
 375 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 376 void free_symfile_segment_data (struct symfile_segment_data *data);
 377
 378 /* From dwarf2read.c */
 379
 380 extern int dwarf2_has_info (struct objfile *);
 381
 382 extern void dwarf2_build_psymtabs (struct objfile *, int);
 383 extern void dwarf2_build_frame_info (struct objfile *);
 384
 385 void dwarf2_free_objfile (struct objfile *);
 386
 387 /* From mdebugread.c */
 388
 389 /* Hack to force structures to exist before use in parameter list.  */
 390 struct ecoff_debug_hack
 391 {
 392   struct ecoff_debug_swap *a;
 393   struct ecoff_debug_info *b;
 394 };
 395
 396 extern void mdebug_build_psymtabs (struct objfile *,
 397                                    const struct ecoff_debug_swap *,
 398                                    struct ecoff_debug_info *);
 399
 400 extern void elfmdebug_build_psymtabs (struct objfile *,
 401                                       const struct ecoff_debug_swap *,
 402                                       asection *);
 403
 404 #endif /* !defined(SYMFILE_H) */