1 /* Generic symbol file reading for the GNU debugger, GDB.
2 Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
3 Contributed by Cygnus Support, using pieces from other GDB modules.
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 2 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
31 #include "breakpoint.h"
33 #include "complaints.h"
39 #include <sys/types.h>
45 /* Global variables owned by this file */
47 int readnow_symbol_files
; /* Read full symbols immediately */
49 struct complaint oldsyms_complaint
= {
50 "Replacing old symbols for `%s'", 0, 0
53 struct complaint empty_symtab_complaint
= {
54 "Empty symbol table found for `%s'", 0, 0
57 /* External variables and functions referenced. */
59 extern int info_verbose
;
61 /* Functions this file defines */
64 set_initial_language
PARAMS ((void));
67 load_command
PARAMS ((char *, int));
70 add_symbol_file_command
PARAMS ((char *, int));
73 cashier_psymtab
PARAMS ((struct partial_symtab
*));
76 compare_psymbols
PARAMS ((const void *, const void *));
79 compare_symbols
PARAMS ((const void *, const void *));
82 symfile_bfd_open
PARAMS ((char *));
85 find_sym_fns
PARAMS ((struct objfile
*));
88 clear_symtab_users_once
PARAMS ((void));
90 /* List of all available sym_fns. On gdb startup, each object file reader
91 calls add_symtab_fns() to register information on each format it is
94 static struct sym_fns
*symtab_fns
= NULL
;
96 /* Structures with which to manage partial symbol allocation. */
98 struct psymbol_allocation_list global_psymbols
= {0}, static_psymbols
= {0};
100 /* Flag for whether user will be reloading symbols multiple times.
101 Defaults to ON for VxWorks, otherwise OFF. */
103 #ifdef SYMBOL_RELOADING_DEFAULT
104 int symbol_reloading
= SYMBOL_RELOADING_DEFAULT
;
106 int symbol_reloading
= 0;
110 /* In the following sort, we always make sure that
111 register debug symbol declarations always come before regular
112 debug symbol declarations (as might happen when parameters are
113 then put into registers by the compiler).
115 Since this function is called from within qsort, in an ANSI environment
116 it must conform to the prototype for qsort, which specifies that the
117 comparison function takes two "void *" pointers. */
120 compare_symbols (s1p
, s2p
)
124 register struct symbol
**s1
, **s2
;
125 register int namediff
;
127 s1
= (struct symbol
**) s1p
;
128 s2
= (struct symbol
**) s2p
;
130 /* Compare the initial characters. */
131 namediff
= SYMBOL_NAME (*s1
)[0] - SYMBOL_NAME (*s2
)[0];
132 if (namediff
!= 0) return namediff
;
134 /* If they match, compare the rest of the names. */
135 namediff
= STRCMP (SYMBOL_NAME (*s1
), SYMBOL_NAME (*s2
));
136 if (namediff
!= 0) return namediff
;
138 /* For symbols of the same name, registers should come first. */
139 return ((SYMBOL_CLASS (*s2
) == LOC_REGISTER
)
140 - (SYMBOL_CLASS (*s1
) == LOC_REGISTER
));
147 compare_psymbols -- compare two partial symbols by name
151 Given pointer to two partial symbol table entries, compare
152 them by name and return -N, 0, or +N (ala strcmp). Typically
153 used by sorting routines like qsort().
157 Does direct compare of first two characters before punting
158 and passing to strcmp for longer compares. Note that the
159 original version had a bug whereby two null strings or two
160 identically named one character strings would return the
161 comparison of memory following the null byte.
166 compare_psymbols (s1p
, s2p
)
170 register char *st1
= SYMBOL_NAME ((struct partial_symbol
*) s1p
);
171 register char *st2
= SYMBOL_NAME ((struct partial_symbol
*) s2p
);
173 if ((st1
[0] - st2
[0]) || !st1
[0])
175 return (st1
[0] - st2
[0]);
177 else if ((st1
[1] - st2
[1]) || !st1
[1])
179 return (st1
[1] - st2
[1]);
183 return (STRCMP (st1
+ 2, st2
+ 2));
188 sort_pst_symbols (pst
)
189 struct partial_symtab
*pst
;
191 /* Sort the global list; don't sort the static list */
193 qsort (pst
-> objfile
-> global_psymbols
.list
+ pst
-> globals_offset
,
194 pst
-> n_global_syms
, sizeof (struct partial_symbol
),
198 /* Call sort_block_syms to sort alphabetically the symbols of one block. */
202 register struct block
*b
;
204 qsort (&BLOCK_SYM (b
, 0), BLOCK_NSYMS (b
),
205 sizeof (struct symbol
*), compare_symbols
);
208 /* Call sort_symtab_syms to sort alphabetically
209 the symbols of each block of one symtab. */
213 register struct symtab
*s
;
215 register struct blockvector
*bv
;
218 register struct block
*b
;
222 bv
= BLOCKVECTOR (s
);
223 nbl
= BLOCKVECTOR_NBLOCKS (bv
);
224 for (i
= 0; i
< nbl
; i
++)
226 b
= BLOCKVECTOR_BLOCK (bv
, i
);
227 if (BLOCK_SHOULD_SORT (b
))
233 sort_all_symtab_syms ()
235 register struct symtab
*s
;
236 register struct objfile
*objfile
;
238 for (objfile
= object_files
; objfile
!= NULL
; objfile
= objfile
-> next
)
240 for (s
= objfile
-> symtabs
; s
!= NULL
; s
= s
-> next
)
242 sort_symtab_syms (s
);
247 /* Make a copy of the string at PTR with SIZE characters in the symbol obstack
248 (and add a null character at the end in the copy).
249 Returns the address of the copy. */
252 obsavestring (ptr
, size
, obstackp
)
255 struct obstack
*obstackp
;
257 register char *p
= (char *) obstack_alloc (obstackp
, size
+ 1);
258 /* Open-coded bcopy--saves function call time.
259 These strings are usually short. */
261 register char *p1
= ptr
;
262 register char *p2
= p
;
263 char *end
= ptr
+ size
;
271 /* Concatenate strings S1, S2 and S3; return the new string.
272 Space is found in the symbol_obstack. */
275 obconcat (obstackp
, s1
, s2
, s3
)
276 struct obstack
*obstackp
;
277 const char *s1
, *s2
, *s3
;
279 register int len
= strlen (s1
) + strlen (s2
) + strlen (s3
) + 1;
280 register char *val
= (char *) obstack_alloc (obstackp
, len
);
287 /* Get the symbol table that corresponds to a partial_symtab.
288 This is fast after the first time you do it. In fact, there
289 is an even faster macro PSYMTAB_TO_SYMTAB that does the fast
293 psymtab_to_symtab (pst
)
294 register struct partial_symtab
*pst
;
296 /* If it's been looked up before, return it. */
300 /* If it has not yet been read in, read it. */
303 (*pst
->read_symtab
) (pst
);
309 /* Initialize entry point information for this objfile. */
312 init_entry_point_info (objfile
)
313 struct objfile
*objfile
;
315 /* Save startup file's range of PC addresses to help blockframe.c
316 decide where the bottom of the stack is. */
318 if (bfd_get_file_flags (objfile
-> obfd
) & EXEC_P
)
320 /* Executable file -- record its entry point so we'll recognize
321 the startup file because it contains the entry point. */
322 objfile
-> ei
.entry_point
= bfd_get_start_address (objfile
-> obfd
);
326 /* Examination of non-executable.o files. Short-circuit this stuff. */
327 /* ~0 will not be in any file, we hope. */
328 objfile
-> ei
.entry_point
= ~0;
329 /* set the startup file to be an empty range. */
330 objfile
-> ei
.entry_file_lowpc
= 0;
331 objfile
-> ei
.entry_file_highpc
= 0;
335 /* Remember the lowest-addressed loadable section we've seen.
336 This function is called via bfd_map_over_sections. */
338 #if 0 /* Not used yet */
340 find_lowest_section (abfd
, sect
, obj
)
345 asection
**lowest
= (asection
**)obj
;
347 if (0 == (bfd_get_section_flags (abfd
, sect
) & SEC_LOAD
))
350 *lowest
= sect
; /* First loadable section */
351 else if (bfd_section_vma (abfd
, *lowest
) >= bfd_section_vma (abfd
, sect
))
352 *lowest
= sect
; /* A lower loadable section */
356 /* Process a symbol file, as either the main file or as a dynamically
359 NAME is the file name (which will be tilde-expanded and made
360 absolute herein) (but we don't free or modify NAME itself).
361 FROM_TTY says how verbose to be. MAINLINE specifies whether this
362 is the main symbol file, or whether it's an extra symbol file such
363 as dynamically loaded code. If !mainline, ADDR is the address
364 where the text segment was loaded. If VERBO, the caller has printed
365 a verbose message about the symbol reading (and complaints can be
366 more terse about it). */
369 syms_from_objfile (objfile
, addr
, mainline
, verbo
)
370 struct objfile
*objfile
;
375 struct section_offsets
*section_offsets
;
376 asection
*lowest_sect
;
378 /* There is a distinction between having no symbol table
379 (we refuse to read the file, leaving the old set of symbols around)
380 and having no debugging symbols in your symbol table (we read
381 the file and end up with a mostly empty symbol table).
383 FIXME: This strategy works correctly when the debugging symbols are
384 intermixed with "normal" symbols. However, when the debugging symbols
385 are separate, such as with ELF/DWARF, it is perfectly plausible for
386 the symbol table to be missing but still have all the DWARF info
387 intact. Thus in general it is wrong to assume that having no symbol
388 table implies no debugging information. */
390 if (!(bfd_get_file_flags (objfile
-> obfd
) & HAS_SYMS
))
393 init_entry_point_info (objfile
);
394 find_sym_fns (objfile
);
398 /* Since no error yet, throw away the old symbol table. */
400 if (symfile_objfile
!= NULL
)
402 free_objfile (symfile_objfile
);
403 symfile_objfile
= NULL
;
406 (*objfile
-> sf
-> sym_new_init
) (objfile
);
409 /* Convert addr into an offset rather than an absolute address.
410 We find the lowest address of a loaded segment in the objfile,
411 and assume that <addr> is where that got loaded. Due to historical
412 precedent, we warn if that doesn't happen to be the ".text"
417 addr
= 0; /* No offset from objfile addresses. */
421 lowest_sect
= bfd_get_section_by_name (objfile
->obfd
, ".text");
424 bfd_map_over_sections (objfile
->obfd
, find_lowest_section
,
428 if (lowest_sect
== 0)
429 warning ("no loadable sections found in added symbol-file %s",
431 else if (0 == bfd_get_section_name (objfile
->obfd
, lowest_sect
)
433 bfd_get_section_name (objfile
->obfd
, lowest_sect
)))
434 warning ("Lowest section in %s is %s at 0x%x",
436 bfd_section_name (objfile
->obfd
, lowest_sect
),
437 bfd_section_vma (objfile
->obfd
, lowest_sect
));
440 addr
-= bfd_section_vma (objfile
->obfd
, lowest_sect
);
443 /* Debugging check inserted for testing elimination of NAMES_HAVE_UNDERSCORE.
444 Complain if the dynamic setting of NAMES_HAVE_UNDERSCORE from BFD
445 doesn't match the static setting from the GDB config files.
446 FIXME: Remove this check after a round of testing.
447 -- gnu@cygnus.com, 16dec92 */
448 #ifdef NAMES_HAVE_UNDERSCORE
449 if (bfd_get_symbol_leading_char(objfile
->obfd
) != '_')
451 if (bfd_get_symbol_leading_char(objfile
->obfd
) != 0)
454 "GDB internal error! NAMES_HAVE_UNDERSCORE set wrong for %s BFD:\n%s\n",
455 objfile
->obfd
->xvec
->name
,
456 objfile
->obfd
->filename
);
457 /* End of debugging check. FIXME. */
459 /* Initialize symbol reading routines for this objfile, allow complaints to
460 appear for this new file, and record how verbose to be, then do the
461 initial symbol reading for this file. */
463 (*objfile
-> sf
-> sym_init
) (objfile
);
464 clear_complaints (1, verbo
);
465 section_offsets
= (*objfile
-> sf
-> sym_offsets
) (objfile
, addr
);
466 (*objfile
-> sf
-> sym_read
) (objfile
, section_offsets
, mainline
);
468 /* Don't allow char * to have a typename (else would get caddr_t.) */
469 /* Ditto void *. FIXME should do this for all the builtin types. */
471 TYPE_NAME (lookup_pointer_type (builtin_type_char
)) = 0;
472 TYPE_NAME (lookup_pointer_type (builtin_type_void
)) = 0;
474 /* Mark the objfile has having had initial symbol read attempted. Note
475 that this does not mean we found any symbols... */
477 objfile
-> flags
|= OBJF_SYMS
;
480 /* Perform required actions immediately after either reading in the initial
481 symbols for a new objfile, or mapping in the symbols from a reusable
485 new_symfile_objfile (objfile
, mainline
, verbo
)
486 struct objfile
*objfile
;
492 /* OK, make it the "real" symbol file. */
493 symfile_objfile
= objfile
;
496 /* If we have wiped out any old symbol tables, clean up. */
497 clear_symtab_users_once ();
499 /* We're done reading the symbol file; finish off complaints. */
500 clear_complaints (0, verbo
);
502 /* Fixup all the breakpoints that may have been redefined by this
505 breakpoint_re_set ();
508 /* Process a symbol file, as either the main file or as a dynamically
511 NAME is the file name (which will be tilde-expanded and made
512 absolute herein) (but we don't free or modify NAME itself).
513 FROM_TTY says how verbose to be. MAINLINE specifies whether this
514 is the main symbol file, or whether it's an extra symbol file such
515 as dynamically loaded code. If !mainline, ADDR is the address
516 where the text segment was loaded.
518 Upon success, returns a pointer to the objfile that was added.
519 Upon failure, jumps back to command level (never returns). */
522 symbol_file_add (name
, from_tty
, addr
, mainline
, mapped
, readnow
)
530 struct objfile
*objfile
;
531 struct partial_symtab
*psymtab
;
534 /* Open a bfd for the file and then check to see if the file has a
535 symbol table. There is a distinction between having no symbol table
536 (we refuse to read the file, leaving the old set of symbols around)
537 and having no debugging symbols in the symbol table (we read the file
538 and end up with a mostly empty symbol table, but with lots of stuff in
539 the minimal symbol table). We need to make the decision about whether
540 to continue with the file before allocating and building a objfile.
542 FIXME: This strategy works correctly when the debugging symbols are
543 intermixed with "normal" symbols. However, when the debugging symbols
544 are separate, such as with ELF/DWARF, it is perfectly plausible for
545 the symbol table to be missing but still have all the DWARF info
546 intact. Thus in general it is wrong to assume that having no symbol
547 table implies no debugging information. */
549 abfd
= symfile_bfd_open (name
);
550 if (!(bfd_get_file_flags (abfd
) & HAS_SYMS
))
552 error ("%s has no symbol-table", name
);
555 if ((have_full_symbols () || have_partial_symbols ())
558 && !query ("Load new symbol table from \"%s\"? ", name
))
559 error ("Not confirmed.");
561 /* Getting new symbols may change our opinion about what is
564 reinit_frame_cache ();
566 objfile
= allocate_objfile (abfd
, mapped
);
568 /* If the objfile uses a mapped symbol file, and we have a psymtab for
569 it, then skip reading any symbols at this time. */
571 if ((objfile
-> flags
& OBJF_MAPPED
) && (objfile
-> flags
& OBJF_SYMS
))
573 /* We mapped in an existing symbol table file that already has had
574 initial symbol reading performed, so we can skip that part. Notify
575 the user that instead of reading the symbols, they have been mapped.
577 if (from_tty
|| info_verbose
)
579 printf_filtered ("Mapped symbols for %s...", name
);
583 init_entry_point_info (objfile
);
584 find_sym_fns (objfile
);
588 /* We either created a new mapped symbol table, mapped an existing
589 symbol table file which has not had initial symbol reading
590 performed, or need to read an unmapped symbol table. */
591 if (from_tty
|| info_verbose
)
593 printf_filtered ("Reading symbols from %s...", name
);
597 syms_from_objfile (objfile
, addr
, mainline
, from_tty
);
600 new_symfile_objfile (objfile
, mainline
, from_tty
);
602 /* We now have at least a partial symbol table. Check to see if the
603 user requested that all symbols be read on initial access via either
604 the gdb startup command line or on a per symbol file basis. Expand
605 all partial symbol tables for this objfile if so. */
607 if (readnow
|| readnow_symbol_files
)
609 if (from_tty
|| info_verbose
)
611 printf_filtered ("expanding to full symbols...");
616 for (psymtab
= objfile
-> psymtabs
;
618 psymtab
= psymtab
-> next
)
620 psymtab_to_symtab (psymtab
);
624 if (from_tty
|| info_verbose
)
626 printf_filtered ("done.\n");
633 /* This is the symbol-file command. Read the file, analyze its symbols,
634 and add a struct symtab to a symtab list. */
637 symbol_file_command (args
, from_tty
)
643 struct cleanup
*cleanups
;
651 if ((have_full_symbols () || have_partial_symbols ())
653 && !query ("Discard symbol table from `%s'? ",
654 symfile_objfile
-> name
))
655 error ("Not confirmed.");
656 free_all_objfiles ();
657 symfile_objfile
= NULL
;
658 current_source_symtab
= NULL
;
659 current_source_line
= 0;
662 printf ("No symbol file now.\n");
667 if ((argv
= buildargv (args
)) == NULL
)
671 cleanups
= make_cleanup (freeargv
, (char *) argv
);
672 while (*argv
!= NULL
)
674 if (STREQ (*argv
, "-mapped"))
678 else if (STREQ (*argv
, "-readnow"))
682 else if (**argv
== '-')
684 error ("unknown option `%s'", *argv
);
695 error ("no symbol file name was specified");
699 symbol_file_add (name
, from_tty
, (CORE_ADDR
)0, 1, mapped
, readnow
);
700 set_initial_language ();
702 do_cleanups (cleanups
);
706 /* Set the initial language.
708 A better solution would be to record the language in the psymtab when reading
709 partial symbols, and then use it (if known) to set the language. This would
710 be a win for formats that encode the language in an easily discoverable place,
711 such as DWARF. For stabs, we can jump through hoops looking for specially
712 named symbols or try to intuit the language from the specific type of stabs
713 we find, but we can't do that until later when we read in full symbols.
717 set_initial_language ()
719 struct partial_symtab
*pst
;
720 enum language lang
= language_unknown
;
722 pst
= find_main_psymtab ();
725 if (pst
-> filename
!= NULL
)
727 lang
= deduce_language_from_filename (pst
-> filename
);
729 if (lang
== language_unknown
)
731 /* Make C the default language */
735 expected_language
= current_language
; /* Don't warn the user */
739 /* Open file specified by NAME and hand it off to BFD for preliminary
740 analysis. Result is a newly initialized bfd *, which includes a newly
741 malloc'd` copy of NAME (tilde-expanded and made absolute).
742 In case of trouble, error() is called. */
745 symfile_bfd_open (name
)
752 name
= tilde_expand (name
); /* Returns 1st new malloc'd copy */
754 /* Look down path for it, allocate 2nd new malloc'd copy. */
755 desc
= openp (getenv ("PATH"), 1, name
, O_RDONLY
, 0, &absolute_name
);
758 make_cleanup (free
, name
);
759 perror_with_name (name
);
761 free (name
); /* Free 1st new malloc'd copy */
762 name
= absolute_name
; /* Keep 2nd malloc'd copy in bfd */
763 /* It'll be freed in free_objfile(). */
765 sym_bfd
= bfd_fdopenr (name
, NULL
, desc
);
769 make_cleanup (free
, name
);
770 error ("\"%s\": can't open to read symbols: %s.", name
,
771 bfd_errmsg (bfd_error
));
773 sym_bfd
->cacheable
= true;
775 if (!bfd_check_format (sym_bfd
, bfd_object
))
777 bfd_close (sym_bfd
); /* This also closes desc */
778 make_cleanup (free
, name
);
779 error ("\"%s\": can't read symbols: %s.", name
,
780 bfd_errmsg (bfd_error
));
786 /* Link a new symtab_fns into the global symtab_fns list. Called on gdb
787 startup by the _initialize routine in each object file format reader,
788 to register information about each format the the reader is prepared
795 sf
->next
= symtab_fns
;
800 /* Initialize to read symbols from the symbol file sym_bfd. It either
801 returns or calls error(). The result is an initialized struct sym_fns
802 in the objfile structure, that contains cached information about the
806 find_sym_fns (objfile
)
807 struct objfile
*objfile
;
811 for (sf
= symtab_fns
; sf
!= NULL
; sf
= sf
-> next
)
813 if (strncmp (bfd_get_target (objfile
-> obfd
),
814 sf
-> sym_name
, sf
-> sym_namelen
) == 0)
820 error ("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown.",
821 bfd_get_target (objfile
-> obfd
));
824 /* This function runs the load command of our current target. */
827 load_command (arg
, from_tty
)
831 target_load (arg
, from_tty
);
834 /* This function allows the addition of incrementally linked object files.
835 It does not modify any state in the target, only in the debugger. */
839 add_symbol_file_command (args
, from_tty
)
853 error ("add-symbol-file takes a file name and an address");
856 /* Make a copy of the string that we can safely write into. */
858 args
= strdup (args
);
859 make_cleanup (free
, args
);
861 /* Pick off any -option args and the file name. */
863 while ((*args
!= '\000') && (name
== NULL
))
865 while (isspace (*args
)) {args
++;}
867 while ((*args
!= '\000') && !isspace (*args
)) {args
++;}
876 else if (STREQ (arg
, "-mapped"))
880 else if (STREQ (arg
, "-readnow"))
886 error ("unknown option `%s'", arg
);
890 /* After picking off any options and the file name, args should be
891 left pointing at the remainder of the command line, which should
892 be the address expression to evaluate. */
894 if ((name
== NULL
) || (*args
== '\000') )
896 error ("add-symbol-file takes a file name and an address");
898 name
= tilde_expand (name
);
899 make_cleanup (free
, name
);
901 text_addr
= parse_and_eval_address (args
);
903 if (!query ("add symbol table from file \"%s\" at text_addr = %s?\n",
904 name
, local_hex_string (text_addr
)))
905 error ("Not confirmed.");
907 symbol_file_add (name
, 0, text_addr
, 0, mapped
, readnow
);
910 /* Re-read symbols if a symbol-file has changed. */
914 struct objfile
*objfile
;
917 struct stat new_statbuf
;
920 /* With the addition of shared libraries, this should be modified,
921 the load time should be saved in the partial symbol tables, since
922 different tables may come from different source files. FIXME.
923 This routine should then walk down each partial symbol table
924 and see if the symbol table that it originates from has been changed */
927 for (objfile
= object_files
; objfile
; objfile
= objfile
->next
) {
929 #ifdef IBM6000_TARGET
930 /* If this object is from a shared library, then you should
931 stat on the library name, not member name. */
933 if (objfile
->obfd
->my_archive
)
934 res
= stat (objfile
->obfd
->my_archive
->filename
, &new_statbuf
);
937 res
= stat (objfile
->name
, &new_statbuf
);
939 /* FIXME, should use print_sys_errmsg but it's not filtered. */
940 printf_filtered ("`%s' has disappeared; keeping its symbols.\n",
944 new_modtime
= new_statbuf
.st_mtime
;
945 if (new_modtime
!= objfile
->mtime
) {
946 printf_filtered ("`%s' has changed; re-reading symbols.\n",
948 /* FIXME, this should use a different command...that would only
949 affect this objfile's symbols, and would reset objfile->mtime.
950 (objfile->mtime = new_modtime;)
951 HOWEVER, that command isn't written yet -- so call symbol_file_
952 command, and restart the scan from the top, because it munges
953 the object_files list. */
954 symbol_file_command (objfile
->name
, 0);
956 goto the_big_top
; /* Start over. */
962 breakpoint_re_set ();
967 deduce_language_from_filename (filename
)
970 char *c
= strrchr (filename
, '.');
972 if (!c
) ; /* Get default. */
973 else if(STREQ(c
,".mod"))
975 else if(STREQ(c
,".c"))
977 else if(STREQ(c
,".cc") || STREQ(c
,".C"))
978 return language_cplus
;
979 /* start-sanitize-chill */
980 else if(STREQ(c
,".ch") || STREQ(c
,".c186") || STREQ(c
,".c286"))
981 return language_chill
;
982 /* end-sanitize-chill */
984 return language_unknown
; /* default */
989 Allocate and partly initialize a new symbol table. Return a pointer
990 to it. error() if no space.
992 Caller must set these fields:
998 initialize any EXTRA_SYMTAB_INFO
999 possibly free_named_symtabs (symtab->filename);
1003 allocate_symtab (filename
, objfile
)
1005 struct objfile
*objfile
;
1007 register struct symtab
*symtab
;
1009 symtab
= (struct symtab
*)
1010 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symtab
));
1011 memset (symtab
, 0, sizeof (*symtab
));
1012 symtab
-> filename
= obsavestring (filename
, strlen (filename
),
1013 &objfile
-> symbol_obstack
);
1014 symtab
-> fullname
= NULL
;
1015 symtab
-> language
= deduce_language_from_filename (filename
);
1017 /* Hook it to the objfile it comes from */
1019 symtab
-> objfile
= objfile
;
1020 symtab
-> next
= objfile
-> symtabs
;
1021 objfile
-> symtabs
= symtab
;
1023 #ifdef INIT_EXTRA_SYMTAB_INFO
1024 INIT_EXTRA_SYMTAB_INFO (symtab
);
1030 struct partial_symtab
*
1031 allocate_psymtab (filename
, objfile
)
1033 struct objfile
*objfile
;
1035 struct partial_symtab
*psymtab
;
1037 if (objfile
-> free_psymtabs
)
1039 psymtab
= objfile
-> free_psymtabs
;
1040 objfile
-> free_psymtabs
= psymtab
-> next
;
1043 psymtab
= (struct partial_symtab
*)
1044 obstack_alloc (&objfile
-> psymbol_obstack
,
1045 sizeof (struct partial_symtab
));
1047 memset (psymtab
, 0, sizeof (struct partial_symtab
));
1048 psymtab
-> filename
= obsavestring (filename
, strlen (filename
),
1049 &objfile
-> psymbol_obstack
);
1050 psymtab
-> symtab
= NULL
;
1052 /* Hook it to the objfile it comes from */
1054 psymtab
-> objfile
= objfile
;
1055 psymtab
-> next
= objfile
-> psymtabs
;
1056 objfile
-> psymtabs
= psymtab
;
1062 /* clear_symtab_users_once:
1064 This function is run after symbol reading, or from a cleanup.
1065 If an old symbol table was obsoleted, the old symbol table
1066 has been blown away, but the other GDB data structures that may
1067 reference it have not yet been cleared or re-directed. (The old
1068 symtab was zapped, and the cleanup queued, in free_named_symtab()
1071 This function can be queued N times as a cleanup, or called
1072 directly; it will do all the work the first time, and then will be a
1073 no-op until the next time it is queued. This works by bumping a
1074 counter at queueing time. Much later when the cleanup is run, or at
1075 the end of symbol processing (in case the cleanup is discarded), if
1076 the queued count is greater than the "done-count", we do the work
1077 and set the done-count to the queued count. If the queued count is
1078 less than or equal to the done-count, we just ignore the call. This
1079 is needed because reading a single .o file will often replace many
1080 symtabs (one per .h file, for example), and we don't want to reset
1081 the breakpoints N times in the user's face.
1083 The reason we both queue a cleanup, and call it directly after symbol
1084 reading, is because the cleanup protects us in case of errors, but is
1085 discarded if symbol reading is successful. */
1087 static int clear_symtab_users_queued
;
1088 static int clear_symtab_users_done
;
1091 clear_symtab_users_once ()
1093 /* Enforce once-per-`do_cleanups'-semantics */
1094 if (clear_symtab_users_queued
<= clear_symtab_users_done
)
1096 clear_symtab_users_done
= clear_symtab_users_queued
;
1098 printf ("Resetting debugger state after updating old symbol tables\n");
1100 /* Someday, we should do better than this, by only blowing away
1101 the things that really need to be blown. */
1102 clear_value_history ();
1104 clear_internalvars ();
1105 breakpoint_re_set ();
1106 set_default_breakpoint (0, 0, 0, 0);
1107 current_source_symtab
= 0;
1110 /* Delete the specified psymtab, and any others that reference it. */
1113 cashier_psymtab (pst
)
1114 struct partial_symtab
*pst
;
1116 struct partial_symtab
*ps
, *pprev
;
1119 /* Find its previous psymtab in the chain */
1120 for (ps
= pst
->objfile
->psymtabs
; ps
; ps
= ps
->next
) {
1127 /* Unhook it from the chain. */
1128 if (ps
== pst
->objfile
->psymtabs
)
1129 pst
->objfile
->psymtabs
= ps
->next
;
1131 pprev
->next
= ps
->next
;
1133 /* FIXME, we can't conveniently deallocate the entries in the
1134 partial_symbol lists (global_psymbols/static_psymbols) that
1135 this psymtab points to. These just take up space until all
1136 the psymtabs are reclaimed. Ditto the dependencies list and
1137 filename, which are all in the psymbol_obstack. */
1139 /* We need to cashier any psymtab that has this one as a dependency... */
1141 for (ps
= pst
->objfile
->psymtabs
; ps
; ps
= ps
->next
) {
1142 for (i
= 0; i
< ps
->number_of_dependencies
; i
++) {
1143 if (ps
->dependencies
[i
] == pst
) {
1144 cashier_psymtab (ps
);
1145 goto again
; /* Must restart, chain has been munged. */
1152 /* If a symtab or psymtab for filename NAME is found, free it along
1153 with any dependent breakpoints, displays, etc.
1154 Used when loading new versions of object modules with the "add-file"
1155 command. This is only called on the top-level symtab or psymtab's name;
1156 it is not called for subsidiary files such as .h files.
1158 Return value is 1 if we blew away the environment, 0 if not.
1159 FIXME. The return valu appears to never be used.
1161 FIXME. I think this is not the best way to do this. We should
1162 work on being gentler to the environment while still cleaning up
1163 all stray pointers into the freed symtab. */
1166 free_named_symtabs (name
)
1170 /* FIXME: With the new method of each objfile having it's own
1171 psymtab list, this function needs serious rethinking. In particular,
1172 why was it ever necessary to toss psymtabs with specific compilation
1173 unit filenames, as opposed to all psymtabs from a particular symbol
1175 Well, the answer is that some systems permit reloading of particular
1176 compilation units. We want to blow away any old info about these
1177 compilation units, regardless of which objfiles they arrived in. --gnu. */
1179 register struct symtab
*s
;
1180 register struct symtab
*prev
;
1181 register struct partial_symtab
*ps
;
1182 struct blockvector
*bv
;
1185 /* We only wack things if the symbol-reload switch is set. */
1186 if (!symbol_reloading
)
1189 /* Some symbol formats have trouble providing file names... */
1190 if (name
== 0 || *name
== '\0')
1193 /* Look for a psymtab with the specified name. */
1196 for (ps
= partial_symtab_list
; ps
; ps
= ps
->next
) {
1197 if (STREQ (name
, ps
->filename
)) {
1198 cashier_psymtab (ps
); /* Blow it away...and its little dog, too. */
1199 goto again2
; /* Must restart, chain has been munged */
1203 /* Look for a symtab with the specified name. */
1205 for (s
= symtab_list
; s
; s
= s
->next
)
1207 if (STREQ (name
, s
->filename
))
1214 if (s
== symtab_list
)
1215 symtab_list
= s
->next
;
1217 prev
->next
= s
->next
;
1219 /* For now, queue a delete for all breakpoints, displays, etc., whether
1220 or not they depend on the symtab being freed. This should be
1221 changed so that only those data structures affected are deleted. */
1223 /* But don't delete anything if the symtab is empty.
1224 This test is necessary due to a bug in "dbxread.c" that
1225 causes empty symtabs to be created for N_SO symbols that
1226 contain the pathname of the object file. (This problem
1227 has been fixed in GDB 3.9x). */
1229 bv
= BLOCKVECTOR (s
);
1230 if (BLOCKVECTOR_NBLOCKS (bv
) > 2
1231 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv
, GLOBAL_BLOCK
))
1232 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv
, STATIC_BLOCK
)))
1234 complain (&oldsyms_complaint
, name
);
1236 clear_symtab_users_queued
++;
1237 make_cleanup (clear_symtab_users_once
, 0);
1240 complain (&empty_symtab_complaint
, name
);
1247 /* It is still possible that some breakpoints will be affected
1248 even though no symtab was found, since the file might have
1249 been compiled without debugging, and hence not be associated
1250 with a symtab. In order to handle this correctly, we would need
1251 to keep a list of text address ranges for undebuggable files.
1252 For now, we do nothing, since this is a fairly obscure case. */
1256 /* FIXME, what about the minimal symbol table? */
1263 /* Allocate and partially fill a partial symtab. It will be
1264 completely filled at the end of the symbol list.
1266 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
1267 is the address relative to which its symbols are (incremental) or 0
1271 struct partial_symtab
*
1272 start_psymtab_common (objfile
, section_offsets
,
1273 filename
, textlow
, global_syms
, static_syms
)
1274 struct objfile
*objfile
;
1275 struct section_offsets
*section_offsets
;
1278 struct partial_symbol
*global_syms
;
1279 struct partial_symbol
*static_syms
;
1281 struct partial_symtab
*psymtab
;
1283 psymtab
= allocate_psymtab (filename
, objfile
);
1284 psymtab
-> section_offsets
= section_offsets
;
1285 psymtab
-> textlow
= textlow
;
1286 psymtab
-> texthigh
= psymtab
-> textlow
; /* default */
1287 psymtab
-> globals_offset
= global_syms
- objfile
-> global_psymbols
.list
;
1288 psymtab
-> statics_offset
= static_syms
- objfile
-> static_psymbols
.list
;
1292 /* Debugging versions of functions that are usually inline macros
1295 #if !INLINE_ADD_PSYMBOL
1297 /* Add a symbol with a long value to a psymtab.
1298 Since one arg is a struct, we pass in a ptr and deref it (sigh). */
1301 add_psymbol_to_list (name
, namelength
, namespace, class, list
, val
, language
,
1305 enum namespace namespace;
1306 enum address_class
class;
1307 struct psymbol_allocation_list
*list
;
1309 enum language language
;
1310 struct objfile
*objfile
;
1312 register struct partial_symbol
*psym
;
1313 register char *demangled_name
;
1315 if (list
->next
>= list
->list
+ list
->size
)
1317 extend_psymbol_list (list
,objfile
);
1319 psym
= list
->next
++;
1321 SYMBOL_NAME (psym
) =
1322 (char *) obstack_alloc (&objfile
->psymbol_obstack
, namelength
+ 1);
1323 memcpy (SYMBOL_NAME (psym
), name
, namelength
);
1324 SYMBOL_NAME (psym
)[namelength
] = '\0';
1325 SYMBOL_VALUE (psym
) = val
;
1326 SYMBOL_LANGUAGE (psym
) = language
;
1327 PSYMBOL_NAMESPACE (psym
) = namespace;
1328 PSYMBOL_CLASS (psym
) = class;
1329 if (language
== language_cplus
)
1332 cplus_demangle (SYMBOL_NAME (psym
), DMGL_PARAMS
| DMGL_ANSI
);
1333 if (demangled_name
== NULL
)
1335 SYMBOL_DEMANGLED_NAME (psym
) = NULL
;
1339 SYMBOL_DEMANGLED_NAME (psym
) =
1340 obsavestring (demangled_name
, strlen (demangled_name
),
1341 &objfile
->psymbol_obstack
);
1342 free (demangled_name
);
1347 /* Add a symbol with a CORE_ADDR value to a psymtab. */
1350 add_psymbol_addr_to_list (name
, namelength
, namespace, class, list
, val
,
1354 enum namespace namespace;
1355 enum address_class
class;
1356 struct psymbol_allocation_list
*list
;
1358 enum language language
;
1359 struct objfile
*objfile
;
1361 register struct partial_symbol
*psym
;
1362 register char *demangled_name
;
1364 if (list
->next
>= list
->list
+ list
->size
)
1366 extend_psymbol_list (list
,objfile
);
1368 psym
= list
->next
++;
1370 SYMBOL_NAME (psym
) =
1371 (char *) obstack_alloc (&objfile
->psymbol_obstack
, namelength
+ 1);
1372 memcpy (SYMBOL_NAME (psym
), name
, namelength
);
1373 SYMBOL_NAME (psym
)[namelength
] = '\0';
1374 SYMBOL_VALUE_ADDRESS (psym
) = val
;
1375 SYMBOL_LANGUAGE (psym
) = language
;
1376 PSYMBOL_NAMESPACE (psym
) = namespace;
1377 PSYMBOL_CLASS (psym
) = class;
1378 if (language
== language_cplus
)
1381 cplus_demangle (SYMBOL_NAME (psym
), DMGL_PARAMS
| DMGL_ANSI
);
1382 if (demangled_name
== NULL
)
1384 SYMBOL_DEMANGLED_NAME (psym
) = NULL
;
1388 SYMBOL_DEMANGLED_NAME (psym
) =
1389 obsavestring (demangled_name
, strlen (demangled_name
),
1390 &objfile
->psymbol_obstack
);
1391 free (demangled_name
);
1396 #endif /* !INLINE_ADD_PSYMBOL */
1400 _initialize_symfile ()
1403 add_com ("symbol-file", class_files
, symbol_file_command
,
1404 "Load symbol table from executable file FILE.\n\
1405 The `file' command can also load symbol tables, as well as setting the file\n\
1408 add_com ("add-symbol-file", class_files
, add_symbol_file_command
,
1409 "Load the symbols from FILE, assuming FILE has been dynamically loaded.\n\
1410 The second argument provides the starting address of the file's text.");
1412 add_com ("load", class_files
, load_command
,
1413 "Dynamically load FILE into the running program, and record its symbols\n\
1414 for access from GDB.");
1417 (add_set_cmd ("symbol-reloading", class_support
, var_boolean
,
1418 (char *)&symbol_reloading
,
1419 "Set dynamic symbol table reloading multiple times in one run.",