1 /* Definitions for reading symbol files into GDB.
3 Copyright (C) 1990-2004, 2007-2012 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 #if !defined (SYMFILE_H)
23 /* This file requires that you first include "bfd.h". */
26 /* Opaque declarations. */
27 struct target_section;
33 /* Comparison function for symbol look ups. */
35 typedef int (symbol_compare_ftype) (const char *string1,
38 /* Partial symbols are stored in the psymbol_cache and pointers to
39 them are kept in a dynamically grown array that is obtained from
40 malloc and grown as necessary via realloc. Each objfile typically
41 has two of these, one for global symbols and one for static
42 symbols. Although this adds a level of indirection for storing or
43 accessing the partial symbols, it allows us to throw away duplicate
44 psymbols and set all pointers to the single saved instance. */
46 struct psymbol_allocation_list
49 /* Pointer to beginning of dynamically allocated array of pointers
50 to partial symbols. The array is dynamically expanded as
51 necessary to accommodate more pointers. */
53 struct partial_symbol **list;
55 /* Pointer to next available slot in which to store a pointer to a
58 struct partial_symbol **next;
60 /* Number of allocated pointer slots in current dynamic array (not
61 the number of bytes of storage). The "next" pointer will always
62 point somewhere between list[0] and list[size], and when at
63 list[size] the array will be expanded on the next attempt to
69 /* Define an array of addresses to accommodate non-contiguous dynamic
70 loading of modules. This is for use when entering commands, so we
71 can keep track of the section names until we read the file and can
72 map them to bfd sections. This structure is also used by solib.c
73 to communicate the section addresses in shared objects to
74 symbol_file_add (). */
76 struct section_addr_info
78 /* The number of sections for which address information is
81 /* Sections whose names are file format dependent. */
87 /* SECTINDEX must be valid for associated BFD or set to -1. */
93 /* A table listing the load segments in a symfile, and which segment
94 each BFD section belongs to. */
95 struct symfile_segment_data
97 /* How many segments are present in this file. If there are
98 two, the text segment is the first one and the data segment
102 /* If NUM_SEGMENTS is greater than zero, the original base address
104 CORE_ADDR *segment_bases;
106 /* If NUM_SEGMENTS is greater than zero, the memory size of each
108 CORE_ADDR *segment_sizes;
110 /* If NUM_SEGMENTS is greater than zero, this is an array of entries
111 recording which segment contains each BFD section.
112 SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
113 S, or zero if it is not in any segment. */
117 /* Callback for quick_symbol_functions->map_symbol_filenames. */
119 typedef void (symbol_filename_ftype) (const char *filename,
120 const char *fullname, void *data);
122 /* The "quick" symbol functions exist so that symbol readers can
123 avoiding an initial read of all the symbols. For example, symbol
124 readers might choose to use the "partial symbol table" utilities,
125 which is one implementation of the quick symbol functions.
127 The quick symbol functions are generally opaque: the underlying
128 representation is hidden from the caller.
130 In general, these functions should only look at whatever special
131 index the symbol reader creates -- looking through the symbol
132 tables themselves is handled by generic code. If a function is
133 defined as returning a "symbol table", this means that the function
134 should only return a newly-created symbol table; it should not
135 examine pre-existing ones.
137 The exact list of functions here was determined in an ad hoc way
138 based on gdb's history. */
140 struct quick_symbol_functions
142 /* Return true if this objfile has any "partial" symbols
144 int (*has_symbols) (struct objfile *objfile);
146 /* Return the symbol table for the "last" file appearing in
148 struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
150 /* Forget all cached full file names for OBJFILE. */
151 void (*forget_cached_source_info) (struct objfile *objfile);
153 /* Expand and iterate over each "partial" symbol table in OBJFILE
154 where the source file is named NAME.
156 If NAME is not absolute, a match after a '/' in the symbol
157 table's file name will also work. FULL_PATH is the absolute file
158 name, and REAL_PATH is the same, run through gdb_realpath.
160 If a match is found, the "partial" symbol table is expanded.
161 Then, this calls iterate_over_some_symtabs (or equivalent) over
162 all newly-created symbol tables, passing CALLBACK and DATA to it.
163 The result of this call is returned. */
164 int (*map_symtabs_matching_filename) (struct objfile *objfile,
166 const char *full_path,
167 const char *real_path,
168 int (*callback) (struct symtab *,
172 /* Check to see if the symbol is defined in a "partial" symbol table
173 of OBJFILE. KIND should be either GLOBAL_BLOCK or STATIC_BLOCK,
174 depending on whether we want to search global symbols or static
175 symbols. NAME is the name of the symbol to look for. DOMAIN
176 indicates what sort of symbol to search for.
178 Returns the newly-expanded symbol table in which the symbol is
179 defined, or NULL if no such symbol table exists. */
180 struct symtab *(*lookup_symbol) (struct objfile *objfile,
181 int kind, const char *name,
184 /* This is called to expand symbol tables before looking up a
185 symbol. A backend can choose to implement this and then have its
186 `lookup_symbol' hook always return NULL, or the reverse. (It
187 doesn't make sense to implement both.) The arguments are as for
189 void (*pre_expand_symtabs_matching) (struct objfile *objfile,
190 enum block_enum block_kind,
194 /* Print statistics about any indices loaded for OBJFILE. The
195 statistics should be printed to gdb_stdout. This is used for
196 "maint print statistics". */
197 void (*print_stats) (struct objfile *objfile);
199 /* Dump any indices loaded for OBJFILE. The dump should go to
200 gdb_stdout. This is used for "maint print objfiles". */
201 void (*dump) (struct objfile *objfile);
203 /* This is called by objfile_relocate to relocate any indices loaded
205 void (*relocate) (struct objfile *objfile,
206 struct section_offsets *new_offsets,
207 struct section_offsets *delta);
209 /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
210 the corresponding symbol tables are loaded. */
211 void (*expand_symtabs_for_function) (struct objfile *objfile,
212 const char *func_name);
214 /* Read all symbol tables associated with OBJFILE. */
215 void (*expand_all_symtabs) (struct objfile *objfile);
217 /* Read all symbol tables associated with OBJFILE which have the
219 This is for the purposes of examining code only, e.g., expand_line_sal.
220 The routine may ignore debug info that is known to not be useful with
221 code, e.g., DW_TAG_type_unit for dwarf debug info. */
222 void (*expand_symtabs_with_filename) (struct objfile *objfile,
223 const char *filename);
225 /* Return the file name of the file holding the global symbol in OBJFILE
226 named NAME. If no such symbol exists in OBJFILE, return NULL. */
227 const char *(*find_symbol_file) (struct objfile *objfile, const char *name);
229 /* Find global or static symbols in all tables that are in NAMESPACE
230 and for which MATCH (symbol name, NAME) == 0, passing each to
231 CALLBACK, reading in partial symbol tables as needed. Look
232 through global symbols if GLOBAL and otherwise static symbols.
233 Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
234 found. After each block is processed, passes NULL to CALLBACK.
235 MATCH must be weaker than strcmp_iw_ordered in the sense that
236 strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0. ORDERED_COMPARE,
237 if non-null, must be an ordering relation compatible with
238 strcmp_iw_ordered in the sense that
239 strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
241 strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
242 (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
243 CALLBACK returns 0 to indicate that the scan should continue, or
244 non-zero to indicate that the scan should be terminated. */
246 void (*map_matching_symbols) (const char *name, domain_enum namespace,
247 struct objfile *, int global,
248 int (*callback) (struct block *,
249 struct symbol *, void *),
251 symbol_compare_ftype *match,
252 symbol_compare_ftype *ordered_compare);
254 /* Expand all symbol tables in OBJFILE matching some criteria.
256 FILE_MATCHER is called for each file in OBJFILE. The file name
257 and the DATA argument are passed to it. If it returns zero, this
258 file is skipped. If FILE_MATCHER is NULL such file is not skipped.
260 Otherwise, if KIND does not match this symbol is skipped.
262 If even KIND matches, then NAME_MATCHER is called for each symbol
263 defined in the file. The symbol "search" name and DATA are passed
266 If NAME_MATCHER returns zero, then this symbol is skipped.
268 Otherwise, this symbol's symbol table is expanded.
270 DATA is user data that is passed unmodified to the callback
272 void (*expand_symtabs_matching)
273 (struct objfile *objfile,
274 int (*file_matcher) (const char *, void *),
275 int (*name_matcher) (const char *, void *),
276 enum search_domain kind,
279 /* Return the symbol table from OBJFILE that contains PC and
280 SECTION. Return NULL if there is no such symbol table. This
281 should return the symbol table that contains a symbol whose
282 address exactly matches PC, or, if there is no exact match, the
283 symbol table that contains a symbol whose address is closest to
285 struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
286 struct minimal_symbol *msymbol,
288 struct obj_section *section,
291 /* Call a callback for every file defined in OBJFILE whose symtab is
292 not already read in. FUN is the callback. It is passed the file's
293 FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
294 the DATA passed to this function. */
295 void (*map_symbol_filenames) (struct objfile *objfile,
296 symbol_filename_ftype *fun, void *data,
300 /* Structure to keep track of symbol reading functions for various
301 object file types. */
306 /* BFD flavour that we handle, or (as a special kludge, see
307 xcoffread.c, (enum bfd_flavour)-1 for xcoff). */
309 enum bfd_flavour sym_flavour;
311 /* Initializes anything that is global to the entire symbol table.
312 It is called during symbol_file_add, when we begin debugging an
313 entirely new program. */
315 void (*sym_new_init) (struct objfile *);
317 /* Reads any initial information from a symbol file, and initializes
318 the struct sym_fns SF in preparation for sym_read(). It is
319 called every time we read a symbol file for any reason. */
321 void (*sym_init) (struct objfile *);
323 /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
324 (or possibly a symtab). OBJFILE is the objfile struct for the
325 file we are reading. SYMFILE_FLAGS are the flags passed to
326 symbol_file_add & co. */
328 void (*sym_read) (struct objfile *, int);
330 /* Read the partial symbols for an objfile. This may be NULL, in which case
331 gdb has to check other ways if this objfile has any symbols. This may
332 only be non-NULL if the objfile actually does have debuginfo available.
335 void (*sym_read_psymbols) (struct objfile *);
337 /* Called when we are finished with an objfile. Should do all
338 cleanup that is specific to the object file format for the
339 particular objfile. */
341 void (*sym_finish) (struct objfile *);
343 /* This function produces a file-dependent section_offsets
344 structure, allocated in the objfile's storage, and based on the
345 parameter. The parameter is currently a CORE_ADDR (FIXME!) for
346 backward compatibility with the higher levels of GDB. It should
347 probably be changed to a string, where NULL means the default,
348 and others are parsed in a file dependent way. */
350 void (*sym_offsets) (struct objfile *, struct section_addr_info *);
352 /* This function produces a format-independent description of
353 the segments of ABFD. Each segment is a unit of the file
354 which may be relocated independently. */
356 struct symfile_segment_data *(*sym_segments) (bfd *abfd);
358 /* This function should read the linetable from the objfile when
359 the line table cannot be read while processing the debugging
362 void (*sym_read_linetable) (void);
364 /* Relocate the contents of a debug section SECTP. The
365 contents are stored in BUF if it is non-NULL, or returned in a
366 malloc'd buffer otherwise. */
368 bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
370 /* The "quick" (aka partial) symbol functions for this symbol
372 const struct quick_symbol_functions *qf;
375 extern struct section_addr_info *
376 build_section_addr_info_from_objfile (const struct objfile *objfile);
378 extern void relative_addr_info_to_section_offsets
379 (struct section_offsets *section_offsets, int num_sections,
380 struct section_addr_info *addrs);
382 extern void addr_info_make_relative (struct section_addr_info *addrs,
385 /* The default version of sym_fns.sym_offsets for readers that don't
386 do anything special. */
388 extern void default_symfile_offsets (struct objfile *objfile,
389 struct section_addr_info *);
391 /* The default version of sym_fns.sym_segments for readers that don't
392 do anything special. */
394 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
396 /* The default version of sym_fns.sym_relocate for readers that don't
397 do anything special. */
399 extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
400 asection *sectp, bfd_byte *buf);
402 extern struct symtab *allocate_symtab (const char *, struct objfile *);
404 extern void add_symtab_fns (const struct sym_fns *);
406 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
407 syms_from_objfile, symbol_file_add, etc. */
409 enum symfile_add_flags
411 /* Be chatty about what you are doing. */
412 SYMFILE_VERBOSE = 1 << 1,
414 /* This is the main symbol file (as opposed to symbol file for dynamically
416 SYMFILE_MAINLINE = 1 << 2,
418 /* Do not call breakpoint_re_set when adding this symbol file. */
419 SYMFILE_DEFER_BP_RESET = 1 << 3,
421 /* Do not immediately read symbols for this file. By default,
422 symbols are read when the objfile is created. */
423 SYMFILE_NO_READ = 1 << 4
426 extern void syms_from_objfile (struct objfile *,
427 struct section_addr_info *,
428 struct section_offsets *, int, int);
430 extern void new_symfile_objfile (struct objfile *, int);
432 extern struct objfile *symbol_file_add (char *, int,
433 struct section_addr_info *, int);
435 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
436 struct section_addr_info *,
437 int, struct objfile *parent);
439 extern void symbol_file_add_separate (bfd *, int, struct objfile *);
441 extern char *find_separate_debug_file_by_debuglink (struct objfile *);
443 /* Create a new section_addr_info, with room for NUM_SECTIONS. */
445 extern struct section_addr_info *alloc_section_addr_info (size_t
448 /* Build (allocate and populate) a section_addr_info struct from an
449 existing section table. */
451 extern struct section_addr_info
452 *build_section_addr_info_from_section_table (const struct target_section
454 const struct target_section
457 /* Free all memory allocated by
458 build_section_addr_info_from_section_table. */
460 extern void free_section_addr_info (struct section_addr_info *);
463 /* Make a copy of the string at PTR with SIZE characters in the symbol
464 obstack (and add a null character at the end in the copy). Returns
465 the address of the copy. */
467 extern char *obsavestring (const char *, int, struct obstack *);
469 /* Concatenate NULL terminated variable argument list of `const char
470 *' strings; return the new string. Space is found in the OBSTACKP.
471 Argument list must be terminated by a sentinel expression `(char *)
474 extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
478 /* If non-zero, shared library symbols will be added automatically
479 when the inferior is created, new libraries are loaded, or when
480 attaching to the inferior. This is almost always what users will
481 want to have happen; but for very large programs, the startup time
482 will be excessive, and so if this is a problem, the user can clear
483 this flag and then add the shared library symbols as needed. Note
484 that there is a potential for confusion, since if the shared
485 library symbols are not loaded, commands like "info fun" will *not*
486 report all the functions that are actually present. */
488 extern int auto_solib_add;
492 extern void set_initial_language (void);
494 extern void find_lowest_section (bfd *, asection *, void *);
496 extern bfd *symfile_bfd_open (char *);
498 extern bfd *bfd_open_maybe_remote (const char *);
500 extern int get_section_index (struct objfile *, char *);
502 /* Utility functions for overlay sections: */
503 extern enum overlay_debugging_state
509 extern int overlay_cache_invalid;
511 /* Return the "mapped" overlay section containing the PC. */
512 extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
514 /* Return any overlay section containing the PC (even in its LMA
516 extern struct obj_section *find_pc_overlay (CORE_ADDR);
518 /* Return true if the section is an overlay. */
519 extern int section_is_overlay (struct obj_section *);
521 /* Return true if the overlay section is currently "mapped". */
522 extern int section_is_mapped (struct obj_section *);
524 /* Return true if pc belongs to section's VMA. */
525 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
527 /* Return true if pc belongs to section's LMA. */
528 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
530 /* Map an address from a section's LMA to its VMA. */
531 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
533 /* Map an address from a section's VMA to its LMA. */
534 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
536 /* Convert an address in an overlay section (force into VMA range). */
537 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
539 /* Load symbols from a file. */
540 extern void symbol_file_add_main (char *args, int from_tty);
542 /* Clear GDB symbol tables. */
543 extern void symbol_file_clear (int from_tty);
545 /* Default overlay update function. */
546 extern void simple_overlay_update (struct obj_section *);
548 extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
551 extern int symfile_map_offsets_to_segments (bfd *,
552 struct symfile_segment_data *,
553 struct section_offsets *,
554 int, const CORE_ADDR *);
555 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
556 void free_symfile_segment_data (struct symfile_segment_data *data);
558 extern struct cleanup *increment_reading_symtab (void);
560 /* From dwarf2read.c */
562 /* Names for a dwarf2 debugging section. The field NORMAL is the normal
563 section name (usually from the DWARF standard), while the field COMPRESSED
564 is the name of compressed sections. If your object file format doesn't
565 support compressed sections, the field COMPRESSED can be NULL. Likewise,
566 the debugging section is not supported, the field NORMAL can be NULL too.
567 It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
570 struct dwarf2_section_names {
572 const char *compressed;
575 /* List of names for dward2 debugging sections. Also most object file formats
576 use the standardized (ie ELF) names, some (eg XCOFF) have customized names
578 The table for the standard names is defined in dwarf2read.c. Please
579 update all instances of dwarf2_debug_sections if you add a field to this
580 structure. It is always safe to use { NULL, NULL } in this case. */
582 struct dwarf2_debug_sections {
583 struct dwarf2_section_names info;
584 struct dwarf2_section_names abbrev;
585 struct dwarf2_section_names line;
586 struct dwarf2_section_names loc;
587 struct dwarf2_section_names macinfo;
588 struct dwarf2_section_names macro;
589 struct dwarf2_section_names str;
590 struct dwarf2_section_names ranges;
591 struct dwarf2_section_names types;
592 struct dwarf2_section_names frame;
593 struct dwarf2_section_names eh_frame;
594 struct dwarf2_section_names gdb_index;
595 /* This field has no meaning, but exists solely to catch changes to
596 this structure which are not reflected in some instance. */
600 extern int dwarf2_has_info (struct objfile *,
601 const struct dwarf2_debug_sections *);
603 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info. */
604 enum dwarf2_section_enum {
609 extern void dwarf2_get_section_info (struct objfile *,
610 enum dwarf2_section_enum,
611 asection **, gdb_byte **,
614 extern int dwarf2_initialize_objfile (struct objfile *);
615 extern void dwarf2_build_psymtabs (struct objfile *);
616 extern void dwarf2_build_frame_info (struct objfile *);
618 void dwarf2_free_objfile (struct objfile *);
620 /* Whether to use deprecated .gdb_index sections. */
621 extern int use_deprecated_index_sections;
623 /* From mdebugread.c */
625 /* Hack to force structures to exist before use in parameter list. */
626 struct ecoff_debug_hack
628 struct ecoff_debug_swap *a;
629 struct ecoff_debug_info *b;
632 extern void mdebug_build_psymtabs (struct objfile *,
633 const struct ecoff_debug_swap *,
634 struct ecoff_debug_info *);
636 extern void elfmdebug_build_psymtabs (struct objfile *,
637 const struct ecoff_debug_swap *,
640 #endif /* !defined(SYMFILE_H) */