1 /* Definitions for reading symbol files into GDB.
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.
7 This file is part of GDB.
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.
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.
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/>. */
22 #if !defined (SYMFILE_H)
25 /* This file requires that you first include "bfd.h". */
28 /* Opaque declarations. */
29 struct target_section;
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. */
43 struct psymbol_allocation_list
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. */
50 struct partial_symbol **list;
52 /* Pointer to next available slot in which to store a pointer to a
55 struct partial_symbol **next;
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
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 (). */
73 struct section_addr_info
75 /* The number of sections for which address information is
78 /* Sections whose names are file format dependent. */
84 /* SECTINDEX must be valid for associated BFD if ADDR is not zero. */
90 /* A table listing the load segments in a symfile, and which segment
91 each BFD section belongs to. */
92 struct symfile_segment_data
94 /* How many segments are present in this file. If there are
95 two, the text segment is the first one and the data segment
99 /* If NUM_SEGMENTS is greater than zero, the original base address
101 CORE_ADDR *segment_bases;
103 /* If NUM_SEGMENTS is greater than zero, the memory size of each
105 CORE_ADDR *segment_sizes;
107 /* If NUM_SEGMENTS is greater than zero, this is an array of entries
108 recording which segment contains each BFD section.
109 SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
110 S, or zero if it is not in any segment. */
114 /* The "quick" symbol functions exist so that symbol readers can
115 avoiding an initial read of all the symbols. For example, symbol
116 readers might choose to use the "partial symbol table" utilities,
117 which is one implementation of the quick symbol functions.
119 The quick symbol functions are generally opaque: the underlying
120 representation is hidden from the caller.
122 In general, these functions should only look at whatever special
123 index the symbol reader creates -- looking through the symbol
124 tables themselves is handled by generic code. If a function is
125 defined as returning a "symbol table", this means that the function
126 should only return a newly-created symbol table; it should not
127 examine pre-existing ones.
129 The exact list of functions here was determined in an ad hoc way
130 based on gdb's history. */
132 struct quick_symbol_functions
134 /* Return true if this objfile has any "partial" symbols
136 int (*has_symbols) (struct objfile *objfile);
138 /* Return the symbol table for the "last" file appearing in
140 struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
142 /* Forget all cached full file names for OBJFILE. */
143 void (*forget_cached_source_info) (struct objfile *objfile);
145 /* Look up the symbol table, in OBJFILE, of a source file named
146 NAME. If there is no '/' in the name, a match after a '/' in the
147 symbol table's file name will also work. FULL_PATH is the
148 absolute file name, and REAL_PATH is the same, run through
151 If no such symbol table can be found, returns 0.
153 Otherwise, sets *RESULT to the symbol table and returns 1. This
154 might return 1 and set *RESULT to NULL if the requested file is
155 an include file that does not have a symtab of its own. */
156 int (*lookup_symtab) (struct objfile *objfile,
158 const char *full_path,
159 const char *real_path,
160 struct symtab **result);
162 /* Check to see if the symbol is defined in a "partial" symbol table
163 of OBJFILE. KIND should be either GLOBAL_BLOCK or STATIC_BLOCK,
164 depending on whether we want to search global symbols or static
165 symbols. NAME is the name of the symbol to look for. DOMAIN
166 indicates what sort of symbol to search for.
168 Returns the newly-expanded symbol table in which the symbol is
169 defined, or NULL if no such symbol table exists. */
170 struct symtab *(*lookup_symbol) (struct objfile *objfile,
171 int kind, const char *name,
174 /* Print statistics about any indices loaded for OBJFILE. The
175 statistics should be printed to gdb_stdout. This is used for
176 "maint print statistics". */
177 void (*print_stats) (struct objfile *objfile);
179 /* Dump any indices loaded for OBJFILE. The dump should go to
180 gdb_stdout. This is used for "maint print objfiles". */
181 void (*dump) (struct objfile *objfile);
183 /* This is called by objfile_relocate to relocate any indices loaded
185 void (*relocate) (struct objfile *objfile,
186 struct section_offsets *new_offsets,
187 struct section_offsets *delta);
189 /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
190 the corresponding symbol tables are loaded. */
191 void (*expand_symtabs_for_function) (struct objfile *objfile,
192 const char *func_name);
194 /* Read all symbol tables associated with OBJFILE. */
195 void (*expand_all_symtabs) (struct objfile *objfile);
197 /* Read all symbol tables associated with OBJFILE which have the
198 file name FILENAME. */
199 void (*expand_symtabs_with_filename) (struct objfile *objfile,
200 const char *filename);
202 /* Return the file name of the file holding the symbol in OBJFILE
203 named NAME. If no such symbol exists in OBJFILE, return NULL. */
204 char *(*find_symbol_file) (struct objfile *objfile, const char *name);
206 /* This method is specific to Ada. It walks the partial symbol
207 tables of OBJFILE looking for a name match. WILD_MATCH and
208 IS_NAME_SUFFIX are predicate functions that the implementation
209 may call to check for a match.
211 This function is completely ad hoc and new implementations should
212 refer to the psymtab implementation to see what to do. */
213 void (*map_ada_symtabs) (struct objfile *objfile,
214 int (*wild_match) (const char *, int, const char *),
215 int (*is_name_suffix) (const char *),
216 void (*callback) (struct objfile *,
217 struct symtab *, void *),
218 const char *name, int global,
219 domain_enum namespace, int wild,
222 /* Expand all symbol tables in OBJFILE matching some criteria.
224 FILE_MATCHER is called for each file in OBJFILE. The file name
225 and the DATA argument are passed to it. If it returns zero, this
228 Otherwise, if the file is not skipped, then NAME_MATCHER is
229 called for each symbol defined in the file. The symbol's
230 "natural" name and DATA are passed to NAME_MATCHER.
232 If NAME_MATCHER returns zero, then this symbol is skipped.
234 Otherwise, if this symbol is not skipped, and it matches KIND,
235 then this symbol's symbol table is expanded.
237 DATA is user data that is passed unmodified to the callback
239 void (*expand_symtabs_matching) (struct objfile *objfile,
240 int (*file_matcher) (const char *, void *),
241 int (*name_matcher) (const char *, void *),
245 /* Return the symbol table from OBJFILE that contains PC and
246 SECTION. Return NULL if there is no such symbol table. This
247 should return the symbol table that contains a symbol whose
248 address exactly matches PC, or, if there is no exact match, the
249 symbol table that contains a symbol whose address is closest to
251 struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
252 struct minimal_symbol *msymbol,
254 struct obj_section *section,
257 /* Call a callback for every symbol defined in OBJFILE. FUN is the
258 callback. It is passed the symbol's natural name, and the DATA
259 passed to this function. */
260 void (*map_symbol_names) (struct objfile *objfile,
261 void (*fun) (const char *, void *),
264 /* Call a callback for every file defined in OBJFILE. FUN is the
265 callback. It is passed the file's name, the file's full name,
266 and the DATA passed to this function. */
267 void (*map_symbol_filenames) (struct objfile *objfile,
268 void (*fun) (const char *, const char *,
273 /* Structure to keep track of symbol reading functions for various
274 object file types. */
279 /* BFD flavour that we handle, or (as a special kludge, see
280 xcoffread.c, (enum bfd_flavour)-1 for xcoff). */
282 enum bfd_flavour sym_flavour;
284 /* Initializes anything that is global to the entire symbol table.
285 It is called during symbol_file_add, when we begin debugging an
286 entirely new program. */
288 void (*sym_new_init) (struct objfile *);
290 /* Reads any initial information from a symbol file, and initializes
291 the struct sym_fns SF in preparation for sym_read(). It is
292 called every time we read a symbol file for any reason. */
294 void (*sym_init) (struct objfile *);
296 /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
297 (or possibly a symtab). OBJFILE is the objfile struct for the
298 file we are reading. SYMFILE_FLAGS are the flags passed to
299 symbol_file_add & co. */
301 void (*sym_read) (struct objfile *, int);
303 /* Called when we are finished with an objfile. Should do all
304 cleanup that is specific to the object file format for the
305 particular objfile. */
307 void (*sym_finish) (struct objfile *);
309 /* This function produces a file-dependent section_offsets
310 structure, allocated in the objfile's storage, and based on the
311 parameter. The parameter is currently a CORE_ADDR (FIXME!) for
312 backward compatibility with the higher levels of GDB. It should
313 probably be changed to a string, where NULL means the default,
314 and others are parsed in a file dependent way. */
316 void (*sym_offsets) (struct objfile *, struct section_addr_info *);
318 /* This function produces a format-independent description of
319 the segments of ABFD. Each segment is a unit of the file
320 which may be relocated independently. */
322 struct symfile_segment_data *(*sym_segments) (bfd *abfd);
324 /* This function should read the linetable from the objfile when
325 the line table cannot be read while processing the debugging
328 void (*sym_read_linetable) (void);
330 /* Relocate the contents of a debug section SECTP. The
331 contents are stored in BUF if it is non-NULL, or returned in a
332 malloc'd buffer otherwise. */
334 bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
336 /* The "quick" (aka partial) symbol functions for this symbol
338 const struct quick_symbol_functions *qf;
340 /* Finds the next struct sym_fns. They are allocated and
341 initialized in whatever module implements the functions pointed
342 to; an initializer calls add_symtab_fns to add them to the global
345 struct sym_fns *next;
349 extern struct section_addr_info *
350 build_section_addr_info_from_objfile (const struct objfile *objfile);
352 extern void relative_addr_info_to_section_offsets
353 (struct section_offsets *section_offsets, int num_sections,
354 struct section_addr_info *addrs);
356 extern void addr_info_make_relative (struct section_addr_info *addrs,
359 /* The default version of sym_fns.sym_offsets for readers that don't
360 do anything special. */
362 extern void default_symfile_offsets (struct objfile *objfile,
363 struct section_addr_info *);
365 /* The default version of sym_fns.sym_segments for readers that don't
366 do anything special. */
368 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
370 /* The default version of sym_fns.sym_relocate for readers that don't
371 do anything special. */
373 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
374 asection *sectp, bfd_byte *buf);
376 extern void extend_psymbol_list (struct psymbol_allocation_list *,
379 /* Add any kind of symbol to a psymbol_allocation_list. */
381 /* #include "demangle.h" */
384 struct partial_symbol *add_psymbol_to_list (char *, int, int, domain_enum,
386 struct psymbol_allocation_list *,
388 enum language, struct objfile *);
390 extern void init_psymbol_list (struct objfile *, int);
392 extern struct symtab *allocate_symtab (char *, struct objfile *);
394 extern void add_symtab_fns (struct sym_fns *);
396 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
397 syms_from_objfile, symbol_file_add, etc. */
399 enum symfile_add_flags
401 /* Be chatty about what you are doing. */
402 SYMFILE_VERBOSE = 1 << 1,
404 /* This is the main symbol file (as opposed to symbol file for dynamically
406 SYMFILE_MAINLINE = 1 << 2,
408 /* Do not call breakpoint_re_set when adding this symbol file. */
409 SYMFILE_DEFER_BP_RESET = 1 << 3
412 extern void syms_from_objfile (struct objfile *,
413 struct section_addr_info *,
414 struct section_offsets *, int, int);
416 extern void new_symfile_objfile (struct objfile *, int);
418 extern struct objfile *symbol_file_add (char *, int,
419 struct section_addr_info *, int);
421 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
422 struct section_addr_info *,
425 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
427 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
429 /* Create a new section_addr_info, with room for NUM_SECTIONS. */
431 extern struct section_addr_info *alloc_section_addr_info (size_t
434 /* Build (allocate and populate) a section_addr_info struct from an
435 existing section table. */
437 extern struct section_addr_info
438 *build_section_addr_info_from_section_table (const struct target_section
440 const struct target_section
443 /* Free all memory allocated by
444 build_section_addr_info_from_section_table. */
446 extern void free_section_addr_info (struct section_addr_info *);
449 extern struct partial_symtab *start_psymtab_common (struct objfile *,
450 struct section_offsets *,
451 const char *, CORE_ADDR,
452 struct partial_symbol **,
453 struct partial_symbol **);
455 /* Make a copy of the string at PTR with SIZE characters in the symbol
456 obstack (and add a null character at the end in the copy). Returns
457 the address of the copy. */
459 extern char *obsavestring (const char *, int, struct obstack *);
461 /* Concatenate NULL terminated variable argument list of `const char *' strings;
462 return the new string. Space is found in the OBSTACKP. Argument list must
463 be terminated by a sentinel expression `(char *) NULL'. */
465 extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
469 /* If non-zero, shared library symbols will be added automatically
470 when the inferior is created, new libraries are loaded, or when
471 attaching to the inferior. This is almost always what users will
472 want to have happen; but for very large programs, the startup time
473 will be excessive, and so if this is a problem, the user can clear
474 this flag and then add the shared library symbols as needed. Note
475 that there is a potential for confusion, since if the shared
476 library symbols are not loaded, commands like "info fun" will *not*
477 report all the functions that are actually present. */
479 extern int auto_solib_add;
481 /* For systems that support it, a threshold size in megabytes. If
482 automatically adding a new library's symbol table to those already
483 known to the debugger would cause the total shared library symbol
484 size to exceed this threshhold, then the shlib's symbols are not
485 added. The threshold is ignored if the user explicitly asks for a
486 shlib to be added, such as when using the "sharedlibrary" command. */
488 extern int auto_solib_limit;
492 extern void set_initial_language (void);
494 extern struct partial_symtab *allocate_psymtab (const char *,
497 extern void discard_psymtab (struct partial_symtab *);
499 extern void find_lowest_section (bfd *, asection *, void *);
501 extern bfd *symfile_bfd_open (char *);
503 extern bfd *bfd_open_maybe_remote (const char *);
505 extern int get_section_index (struct objfile *, char *);
507 /* Utility functions for overlay sections: */
508 extern enum overlay_debugging_state
514 extern int overlay_cache_invalid;
516 /* Return the "mapped" overlay section containing the PC. */
517 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
519 /* Return any overlay section containing the PC (even in its LMA
521 extern struct obj_section *find_pc_overlay (CORE_ADDR);
523 /* Return true if the section is an overlay. */
524 extern int section_is_overlay (struct obj_section *);
526 /* Return true if the overlay section is currently "mapped". */
527 extern int section_is_mapped (struct obj_section *);
529 /* Return true if pc belongs to section's VMA. */
530 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
532 /* Return true if pc belongs to section's LMA. */
533 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
535 /* Map an address from a section's LMA to its VMA. */
536 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
538 /* Map an address from a section's VMA to its LMA. */
539 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
541 /* Convert an address in an overlay section (force into VMA range). */
542 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
544 /* Load symbols from a file. */
545 extern void symbol_file_add_main (char *args, int from_tty);
547 /* Clear GDB symbol tables. */
548 extern void symbol_file_clear (int from_tty);
550 /* Default overlay update function. */
551 extern void simple_overlay_update (struct obj_section *);
553 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
556 extern int symfile_map_offsets_to_segments (bfd *,
557 struct symfile_segment_data *,
558 struct section_offsets *,
559 int, const CORE_ADDR *);
560 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
561 void free_symfile_segment_data (struct symfile_segment_data *data);
563 extern struct cleanup *increment_reading_symtab (void);
565 /* From dwarf2read.c */
567 extern int dwarf2_has_info (struct objfile *);
569 extern void dwarf2_build_psymtabs (struct objfile *);
570 extern void dwarf2_build_frame_info (struct objfile *);
572 void dwarf2_free_objfile (struct objfile *);
574 /* From mdebugread.c */
576 /* Hack to force structures to exist before use in parameter list. */
577 struct ecoff_debug_hack
579 struct ecoff_debug_swap *a;
580 struct ecoff_debug_info *b;
583 extern void mdebug_build_psymtabs (struct objfile *,
584 const struct ecoff_debug_swap *,
585 struct ecoff_debug_info *);
587 extern void elfmdebug_build_psymtabs (struct objfile *,
588 const struct ecoff_debug_swap *,
591 #endif /* !defined(SYMFILE_H) */