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, 2011
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 /* Comparison function for symbol look ups. */
37 typedef int (symbol_compare_ftype
) (const char *string1
,
40 /* Partial symbols are stored in the psymbol_cache and pointers to
41 them are kept in a dynamically grown array that is obtained from
42 malloc and grown as necessary via realloc. Each objfile typically
43 has two of these, one for global symbols and one for static
44 symbols. Although this adds a level of indirection for storing or
45 accessing the partial symbols, it allows us to throw away duplicate
46 psymbols and set all pointers to the single saved instance. */
48 struct psymbol_allocation_list
51 /* Pointer to beginning of dynamically allocated array of pointers
52 to partial symbols. The array is dynamically expanded as
53 necessary to accommodate more pointers. */
55 struct partial_symbol
**list
;
57 /* Pointer to next available slot in which to store a pointer to a
60 struct partial_symbol
**next
;
62 /* Number of allocated pointer slots in current dynamic array (not
63 the number of bytes of storage). The "next" pointer will always
64 point somewhere between list[0] and list[size], and when at
65 list[size] the array will be expanded on the next attempt to
71 /* Define an array of addresses to accommodate non-contiguous dynamic
72 loading of modules. This is for use when entering commands, so we
73 can keep track of the section names until we read the file and can
74 map them to bfd sections. This structure is also used by solib.c
75 to communicate the section addresses in shared objects to
76 symbol_file_add (). */
78 struct section_addr_info
80 /* The number of sections for which address information is
83 /* Sections whose names are file format dependent. */
89 /* SECTINDEX must be valid for associated BFD if ADDR is not zero. */
95 /* A table listing the load segments in a symfile, and which segment
96 each BFD section belongs to. */
97 struct symfile_segment_data
99 /* How many segments are present in this file. If there are
100 two, the text segment is the first one and the data segment
101 is the second one. */
104 /* If NUM_SEGMENTS is greater than zero, the original base address
106 CORE_ADDR
*segment_bases
;
108 /* If NUM_SEGMENTS is greater than zero, the memory size of each
110 CORE_ADDR
*segment_sizes
;
112 /* If NUM_SEGMENTS is greater than zero, this is an array of entries
113 recording which segment contains each BFD section.
114 SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
115 S, or zero if it is not in any segment. */
119 /* The "quick" symbol functions exist so that symbol readers can
120 avoiding an initial read of all the symbols. For example, symbol
121 readers might choose to use the "partial symbol table" utilities,
122 which is one implementation of the quick symbol functions.
124 The quick symbol functions are generally opaque: the underlying
125 representation is hidden from the caller.
127 In general, these functions should only look at whatever special
128 index the symbol reader creates -- looking through the symbol
129 tables themselves is handled by generic code. If a function is
130 defined as returning a "symbol table", this means that the function
131 should only return a newly-created symbol table; it should not
132 examine pre-existing ones.
134 The exact list of functions here was determined in an ad hoc way
135 based on gdb's history. */
137 struct quick_symbol_functions
139 /* Return true if this objfile has any "partial" symbols
141 int (*has_symbols
) (struct objfile
*objfile
);
143 /* Return the symbol table for the "last" file appearing in
145 struct symtab
*(*find_last_source_symtab
) (struct objfile
*objfile
);
147 /* Forget all cached full file names for OBJFILE. */
148 void (*forget_cached_source_info
) (struct objfile
*objfile
);
150 /* Look up the symbol table, in OBJFILE, of a source file named
151 NAME. If there is no '/' in the name, a match after a '/' in the
152 symbol table's file name will also work. FULL_PATH is the
153 absolute file name, and REAL_PATH is the same, run through
156 If no such symbol table can be found, returns 0.
158 Otherwise, sets *RESULT to the symbol table and returns 1. This
159 might return 1 and set *RESULT to NULL if the requested file is
160 an include file that does not have a symtab of its own. */
161 int (*lookup_symtab
) (struct objfile
*objfile
,
163 const char *full_path
,
164 const char *real_path
,
165 struct symtab
**result
);
167 /* Check to see if the symbol is defined in a "partial" symbol table
168 of OBJFILE. KIND should be either GLOBAL_BLOCK or STATIC_BLOCK,
169 depending on whether we want to search global symbols or static
170 symbols. NAME is the name of the symbol to look for. DOMAIN
171 indicates what sort of symbol to search for.
173 Returns the newly-expanded symbol table in which the symbol is
174 defined, or NULL if no such symbol table exists. */
175 struct symtab
*(*lookup_symbol
) (struct objfile
*objfile
,
176 int kind
, const char *name
,
179 /* This is called to expand symbol tables before looking up a
180 symbol. A backend can choose to implement this and then have its
181 `lookup_symbol' hook always return NULL, or the reverse. (It
182 doesn't make sense to implement both.) The arguments are as for
184 void (*pre_expand_symtabs_matching
) (struct objfile
*objfile
,
185 enum block_enum block_kind
,
189 /* Print statistics about any indices loaded for OBJFILE. The
190 statistics should be printed to gdb_stdout. This is used for
191 "maint print statistics". */
192 void (*print_stats
) (struct objfile
*objfile
);
194 /* Dump any indices loaded for OBJFILE. The dump should go to
195 gdb_stdout. This is used for "maint print objfiles". */
196 void (*dump
) (struct objfile
*objfile
);
198 /* This is called by objfile_relocate to relocate any indices loaded
200 void (*relocate
) (struct objfile
*objfile
,
201 struct section_offsets
*new_offsets
,
202 struct section_offsets
*delta
);
204 /* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
205 the corresponding symbol tables are loaded. */
206 void (*expand_symtabs_for_function
) (struct objfile
*objfile
,
207 const char *func_name
);
209 /* Read all symbol tables associated with OBJFILE. */
210 void (*expand_all_symtabs
) (struct objfile
*objfile
);
212 /* Read all symbol tables associated with OBJFILE which have the
214 This is for the purposes of examining code only, e.g., expand_line_sal.
215 The routine may ignore debug info that is known to not be useful with
216 code, e.g., DW_TAG_type_unit for dwarf debug info. */
217 void (*expand_symtabs_with_filename
) (struct objfile
*objfile
,
218 const char *filename
);
220 /* Return the file name of the file holding the symbol in OBJFILE
221 named NAME. If no such symbol exists in OBJFILE, return NULL. */
222 const char *(*find_symbol_file
) (struct objfile
*objfile
, const char *name
);
224 /* Find global or static symbols in all tables that are in NAMESPACE
225 and for which MATCH (symbol name, NAME) == 0, passing each to
226 CALLBACK, reading in partial symbol symbol tables as needed. Look
227 through global symbols if GLOBAL and otherwise static symbols.
228 Passes NAME, NAMESPACE, and DATA to CALLBACK with each symbol
229 found. After each block is processed, passes NULL to CALLBACK.
230 MATCH must be weaker than strcmp_iw in the sense that
231 strcmp_iw(x,y) == 0 --> MATCH(x,y) == 0. ORDERED_COMPARE, if
232 non-null, must be an ordering relation compatible with strcmp_iw
234 strcmp(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
236 strcmp(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
237 (allowing strcmp(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
238 CALLBACK returns 0 to indicate that the scan should continue, or
239 non-zero to indicate that the scan should be terminated. */
241 void (*map_matching_symbols
) (const char *name
, domain_enum
namespace,
242 struct objfile
*, int global
,
243 int (*callback
) (struct block
*,
244 struct symbol
*, void *),
246 symbol_compare_ftype
*match
,
247 symbol_compare_ftype
*ordered_compare
);
249 /* Expand all symbol tables in OBJFILE matching some criteria.
251 FILE_MATCHER is called for each file in OBJFILE. The file name
252 and the DATA argument are passed to it. If it returns zero, this
255 Otherwise, if the file is not skipped, then NAME_MATCHER is
256 called for each symbol defined in the file. The symbol's
257 "natural" name and DATA are passed to NAME_MATCHER.
259 If NAME_MATCHER returns zero, then this symbol is skipped.
261 Otherwise, if this symbol is not skipped, and it matches KIND,
262 then this symbol's symbol table is expanded.
264 DATA is user data that is passed unmodified to the callback
266 void (*expand_symtabs_matching
) (struct objfile
*objfile
,
267 int (*file_matcher
) (const char *, void *),
268 int (*name_matcher
) (const char *, void *),
269 enum search_domain kind
,
272 /* Return the symbol table from OBJFILE that contains PC and
273 SECTION. Return NULL if there is no such symbol table. This
274 should return the symbol table that contains a symbol whose
275 address exactly matches PC, or, if there is no exact match, the
276 symbol table that contains a symbol whose address is closest to
278 struct symtab
*(*find_pc_sect_symtab
) (struct objfile
*objfile
,
279 struct minimal_symbol
*msymbol
,
281 struct obj_section
*section
,
284 /* Call a callback for every symbol defined in OBJFILE. FUN is the
285 callback. It is passed the symbol's natural name, and the DATA
286 passed to this function. */
287 void (*map_symbol_names
) (struct objfile
*objfile
,
288 void (*fun
) (const char *, void *),
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 name,
293 the file's full name, and the DATA passed to this function. */
294 void (*map_symbol_filenames
) (struct objfile
*objfile
,
295 void (*fun
) (const char *, const char *,
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
331 which case gdb assumes that sym_read already read the partial
332 symbols. This may only be non-NULL if the objfile actually does
333 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
*,
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 extern int dwarf2_has_info (struct objfile
*);
564 extern int dwarf2_initialize_objfile (struct objfile
*);
565 extern void dwarf2_build_psymtabs (struct objfile
*);
566 extern void dwarf2_build_frame_info (struct objfile
*);
568 void dwarf2_free_objfile (struct objfile
*);
570 /* From mdebugread.c */
572 /* Hack to force structures to exist before use in parameter list. */
573 struct ecoff_debug_hack
575 struct ecoff_debug_swap
*a
;
576 struct ecoff_debug_info
*b
;
579 extern void mdebug_build_psymtabs (struct objfile
*,
580 const struct ecoff_debug_swap
*,
581 struct ecoff_debug_info
*);
583 extern void elfmdebug_build_psymtabs (struct objfile
*,
584 const struct ecoff_debug_swap
*,
587 #endif /* !defined(SYMFILE_H) */