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
 167   void (*sym_read_linetable) (void);
 168
 169   /* Relocate the contents of a debug section SECTP.  The
 170      contents are stored in BUF if it is non-NULL, or returned in a
 171      malloc'd buffer otherwise.  */
 172
 173   bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
 174
 175   /* Finds the next struct sym_fns.  They are allocated and
 176      initialized in whatever module implements the functions pointed
 177      to; an initializer calls add_symtab_fns to add them to the global
 178      chain.  */
 179
 180   struct sym_fns *next;
 181
 182 };
 183
 184 extern struct section_addr_info *
 185            build_section_addr_info_from_objfile (const struct objfile *objfile);
 186
 187 extern void relative_addr_info_to_section_offsets
 188   (struct section_offsets *section_offsets, int num_sections,
 189    struct section_addr_info *addrs);
 190
 191 extern void addr_info_make_relative (struct section_addr_info *addrs,
 192                                      bfd *abfd);
 193
 194 /* The default version of sym_fns.sym_offsets for readers that don't
 195    do anything special.  */
 196
 197 extern void default_symfile_offsets (struct objfile *objfile,
 198                                      struct section_addr_info *);
 199
 200 /* The default version of sym_fns.sym_segments for readers that don't
 201    do anything special.  */
 202
 203 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 204
 205 /* The default version of sym_fns.sym_relocate for readers that don't
 206    do anything special.  */
 207
 208 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
 209                                            asection *sectp, bfd_byte *buf);
 210
 211 extern void extend_psymbol_list (struct psymbol_allocation_list *,
 212                                  struct objfile *);
 213
 214 /* Add any kind of symbol to a psymbol_allocation_list.  */
 215
 216 /* #include "demangle.h" */
 217
 218 extern const
 219 struct partial_symbol *add_psymbol_to_list (char *, int, int, domain_enum,
 220                                             enum address_class,
 221                                             struct psymbol_allocation_list *,
 222                                             long, CORE_ADDR,
 223                                             enum language, struct objfile *);
 224
 225 extern void init_psymbol_list (struct objfile *, int);
 226
 227 extern void sort_pst_symbols (struct partial_symtab *);
 228
 229 extern struct symtab *allocate_symtab (char *, struct objfile *);
 230
 231 extern void add_symtab_fns (struct sym_fns *);
 232
 233 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
 234    syms_from_objfile, symbol_file_add, etc.  */
 235
 236 enum symfile_add_flags
 237   {
 238     /* Be chatty about what you are doing.  */
 239     SYMFILE_VERBOSE = 1 << 1,
 240
 241     /* This is the main symbol file (as opposed to symbol file for dynamically
 242        loaded code).  */
 243     SYMFILE_MAINLINE = 1 << 2,
 244
 245     /* Do not call breakpoint_re_set when adding this symbol file.  */
 246     SYMFILE_DEFER_BP_RESET = 1 << 3
 247   };
 248
 249 extern void syms_from_objfile (struct objfile *,
 250                                struct section_addr_info *,
 251                                struct section_offsets *, int, int);
 252
 253 extern void new_symfile_objfile (struct objfile *, int);
 254
 255 extern struct objfile *symbol_file_add (char *, int,
 256                                         struct section_addr_info *, int);
 257
 258 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 259                                                  struct section_addr_info *,
 260                                                  int);
 261
 262 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
 263
 264 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
 265
 266 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 267
 268 extern struct section_addr_info *alloc_section_addr_info (size_t
 269                                                           num_sections);
 270
 271 /* Build (allocate and populate) a section_addr_info struct from an
 272    existing section table.  */
 273
 274 extern struct section_addr_info
 275   *build_section_addr_info_from_section_table (const struct target_section
 276                                                *start,
 277                                                const struct target_section
 278                                                *end);
 279
 280 /* Free all memory allocated by
 281    build_section_addr_info_from_section_table.  */
 282
 283 extern void free_section_addr_info (struct section_addr_info *);
 284
 285
 286 extern struct partial_symtab *start_psymtab_common (struct objfile *,
 287                                                     struct section_offsets *,
 288                                                     const char *, CORE_ADDR,
 289                                                     struct partial_symbol **,
 290                                                     struct partial_symbol **);
 291
 292 /* Make a copy of the string at PTR with SIZE characters in the symbol
 293    obstack (and add a null character at the end in the copy).  Returns
 294    the address of the copy.  */
 295
 296 extern char *obsavestring (const char *, int, struct obstack *);
 297
 298 /* Concatenate strings S1, S2 and S3; return the new string.  Space is
 299    found in the OBSTACKP  */
 300
 301 extern char *obconcat (struct obstack *obstackp, const char *, const char *,
 302                        const char *);
 303
 304                         /*   Variables   */
 305
 306 /* If non-zero, shared library symbols will be added automatically
 307    when the inferior is created, new libraries are loaded, or when
 308    attaching to the inferior.  This is almost always what users will
 309    want to have happen; but for very large programs, the startup time
 310    will be excessive, and so if this is a problem, the user can clear
 311    this flag and then add the shared library symbols as needed.  Note
 312    that there is a potential for confusion, since if the shared
 313    library symbols are not loaded, commands like "info fun" will *not*
 314    report all the functions that are actually present.  */
 315
 316 extern int auto_solib_add;
 317
 318 /* For systems that support it, a threshold size in megabytes.  If
 319    automatically adding a new library's symbol table to those already
 320    known to the debugger would cause the total shared library symbol
 321    size to exceed this threshhold, then the shlib's symbols are not
 322    added.  The threshold is ignored if the user explicitly asks for a
 323    shlib to be added, such as when using the "sharedlibrary" command.  */
 324
 325 extern int auto_solib_limit;
 326
 327 /* From symfile.c */
 328
 329 extern void set_initial_language (void);
 330
 331 extern struct partial_symtab *allocate_psymtab (const char *,
 332                                                 struct objfile *);
 333
 334 extern void discard_psymtab (struct partial_symtab *);
 335
 336 extern void find_lowest_section (bfd *, asection *, void *);
 337
 338 extern bfd *symfile_bfd_open (char *);
 339
 340 extern bfd *bfd_open_maybe_remote (const char *);
 341
 342 extern int get_section_index (struct objfile *, char *);
 343
 344 /* Utility functions for overlay sections: */
 345 extern enum overlay_debugging_state
 346 {
 347   ovly_off,
 348   ovly_on,
 349   ovly_auto
 350 } overlay_debugging;
 351 extern int overlay_cache_invalid;
 352
 353 /* Return the "mapped" overlay section containing the PC.  */
 354 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
 355
 356 /* Return any overlay section containing the PC (even in its LMA
 357    region).  */
 358 extern struct obj_section *find_pc_overlay (CORE_ADDR);
 359
 360 /* Return true if the section is an overlay.  */
 361 extern int section_is_overlay (struct obj_section *);
 362
 363 /* Return true if the overlay section is currently "mapped".  */
 364 extern int section_is_mapped (struct obj_section *);
 365
 366 /* Return true if pc belongs to section's VMA.  */
 367 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
 368
 369 /* Return true if pc belongs to section's LMA.  */
 370 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
 371
 372 /* Map an address from a section's LMA to its VMA.  */
 373 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
 374
 375 /* Map an address from a section's VMA to its LMA.  */
 376 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
 377
 378 /* Convert an address in an overlay section (force into VMA range).  */
 379 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
 380
 381 /* Load symbols from a file.  */
 382 extern void symbol_file_add_main (char *args, int from_tty);
 383
 384 /* Clear GDB symbol tables.  */
 385 extern void symbol_file_clear (int from_tty);
 386
 387 /* Default overlay update function.  */
 388 extern void simple_overlay_update (struct obj_section *);
 389
 390 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
 391                                                  bfd_byte *);
 392
 393 extern int symfile_map_offsets_to_segments (bfd *,
 394                                             struct symfile_segment_data *,
 395                                             struct section_offsets *,
 396                                             int, const CORE_ADDR *);
 397 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 398 void free_symfile_segment_data (struct symfile_segment_data *data);
 399
 400 /* From dwarf2read.c */
 401
 402 extern int dwarf2_has_info (struct objfile *);
 403
 404 extern void dwarf2_build_psymtabs (struct objfile *);
 405 extern void dwarf2_build_frame_info (struct objfile *);
 406
 407 void dwarf2_free_objfile (struct objfile *);
 408
 409 /* From mdebugread.c */
 410
 411 /* Hack to force structures to exist before use in parameter list.  */
 412 struct ecoff_debug_hack
 413 {
 414   struct ecoff_debug_swap *a;
 415   struct ecoff_debug_info *b;
 416 };
 417
 418 extern void mdebug_build_psymtabs (struct objfile *,
 419                                    const struct ecoff_debug_swap *,
 420                                    struct ecoff_debug_info *);
 421
 422 extern void elfmdebug_build_psymtabs (struct objfile *,
 423                                       const struct ecoff_debug_swap *,
 424                                       asection *);
 425
 426 #endif /* !defined(SYMFILE_H) */