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"
36 #include <sys/types.h>
42 /* Global variables owned by this file */
44 int readnow_symbol_files
; /* Read full symbols immediately */
46 /* External variables and functions referenced. */
48 extern int info_verbose
;
50 /* Functions this file defines */
53 load_command
PARAMS ((char *, int));
56 add_symbol_file_command
PARAMS ((char *, int));
59 cashier_psymtab
PARAMS ((struct partial_symtab
*));
62 compare_psymbols
PARAMS ((const void *, const void *));
65 compare_symbols
PARAMS ((const void *, const void *));
68 symfile_bfd_open
PARAMS ((char *));
71 find_sym_fns
PARAMS ((struct objfile
*));
74 clear_symtab_users_once
PARAMS ((void));
76 /* List of all available sym_fns. On gdb startup, each object file reader
77 calls add_symtab_fns() to register information on each format it is
80 static struct sym_fns
*symtab_fns
= NULL
;
82 /* Structures with which to manage partial symbol allocation. */
84 struct psymbol_allocation_list global_psymbols
= {0}, static_psymbols
= {0};
86 /* Flag for whether user will be reloading symbols multiple times.
87 Defaults to ON for VxWorks, otherwise OFF. */
89 #ifdef SYMBOL_RELOADING_DEFAULT
90 int symbol_reloading
= SYMBOL_RELOADING_DEFAULT
;
92 int symbol_reloading
= 0;
95 /* Structure to manage complaints about symbol file contents. */
97 struct complaint complaint_root
[1] = {
98 {(char *) 0, 0, complaint_root
},
101 /* Some actual complaints. */
103 struct complaint oldsyms_complaint
= {
104 "Replacing old symbols for `%s'", 0, 0 };
106 struct complaint empty_symtab_complaint
= {
107 "Empty symbol table found for `%s'", 0, 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
)
432 || 0 != strcmp(".text",
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 /* Initialize symbol reading routines for this objfile, allow complaints to
444 appear for this new file, and record how verbose to be, then do the
445 initial symbol reading for this file. */
447 (*objfile
-> sf
-> sym_init
) (objfile
);
448 clear_complaints (1, verbo
);
449 section_offsets
= (*objfile
-> sf
-> sym_offsets
) (objfile
, addr
);
450 (*objfile
-> sf
-> sym_read
) (objfile
, section_offsets
, mainline
);
452 /* Don't allow char * to have a typename (else would get caddr_t.) */
453 /* Ditto void *. FIXME should do this for all the builtin types. */
455 TYPE_NAME (lookup_pointer_type (builtin_type_char
)) = 0;
456 TYPE_NAME (lookup_pointer_type (builtin_type_void
)) = 0;
458 /* Mark the objfile has having had initial symbol read attempted. Note
459 that this does not mean we found any symbols... */
461 objfile
-> flags
|= OBJF_SYMS
;
464 /* Perform required actions immediately after either reading in the initial
465 symbols for a new objfile, or mapping in the symbols from a reusable
469 new_symfile_objfile (objfile
, mainline
, verbo
)
470 struct objfile
*objfile
;
476 /* OK, make it the "real" symbol file. */
477 symfile_objfile
= objfile
;
480 /* If we have wiped out any old symbol tables, clean up. */
481 clear_symtab_users_once ();
483 /* We're done reading the symbol file; finish off complaints. */
484 clear_complaints (0, verbo
);
486 /* Fixup all the breakpoints that may have been redefined by this
489 breakpoint_re_set ();
492 /* Process a symbol file, as either the main file or as a dynamically
495 NAME is the file name (which will be tilde-expanded and made
496 absolute herein) (but we don't free or modify NAME itself).
497 FROM_TTY says how verbose to be. MAINLINE specifies whether this
498 is the main symbol file, or whether it's an extra symbol file such
499 as dynamically loaded code. If !mainline, ADDR is the address
500 where the text segment was loaded.
502 Upon success, returns a pointer to the objfile that was added.
503 Upon failure, jumps back to command level (never returns). */
506 symbol_file_add (name
, from_tty
, addr
, mainline
, mapped
, readnow
)
514 struct objfile
*objfile
;
515 struct partial_symtab
*psymtab
;
518 /* Open a bfd for the file and then check to see if the file has a
519 symbol table. There is a distinction between having no symbol table
520 (we refuse to read the file, leaving the old set of symbols around)
521 and having no debugging symbols in the symbol table (we read the file
522 and end up with a mostly empty symbol table, but with lots of stuff in
523 the minimal symbol table). We need to make the decision about whether
524 to continue with the file before allocating and building a objfile.
526 FIXME: This strategy works correctly when the debugging symbols are
527 intermixed with "normal" symbols. However, when the debugging symbols
528 are separate, such as with ELF/DWARF, it is perfectly plausible for
529 the symbol table to be missing but still have all the DWARF info
530 intact. Thus in general it is wrong to assume that having no symbol
531 table implies no debugging information. */
533 abfd
= symfile_bfd_open (name
);
534 if (!(bfd_get_file_flags (abfd
) & HAS_SYMS
))
536 error ("%s has no symbol-table", name
);
539 if ((have_full_symbols () || have_partial_symbols ())
542 && !query ("Load new symbol table from \"%s\"? ", name
))
543 error ("Not confirmed.");
545 /* Getting new symbols may change our opinion about what is
548 reinit_frame_cache ();
550 objfile
= allocate_objfile (abfd
, mapped
);
552 /* If the objfile uses a mapped symbol file, and we have a psymtab for
553 it, then skip reading any symbols at this time. */
555 if ((objfile
-> flags
& OBJF_MAPPED
) && (objfile
-> flags
& OBJF_SYMS
))
557 /* We mapped in an existing symbol table file that already has had
558 initial symbol reading performed, so we can skip that part. Notify
559 the user that instead of reading the symbols, they have been mapped.
561 if (from_tty
|| info_verbose
)
563 printf_filtered ("Mapped symbols for %s...", name
);
567 init_entry_point_info (objfile
);
568 find_sym_fns (objfile
);
572 /* We either created a new mapped symbol table, mapped an existing
573 symbol table file which has not had initial symbol reading
574 performed, or need to read an unmapped symbol table. */
575 if (from_tty
|| info_verbose
)
577 printf_filtered ("Reading symbols from %s...", name
);
581 syms_from_objfile (objfile
, addr
, mainline
, from_tty
);
584 new_symfile_objfile (objfile
, mainline
, from_tty
);
586 /* We now have at least a partial symbol table. Check to see if the
587 user requested that all symbols be read on initial access via either
588 the gdb startup command line or on a per symbol file basis. Expand
589 all partial symbol tables for this objfile if so. */
591 if (readnow
|| readnow_symbol_files
)
593 if (from_tty
|| info_verbose
)
595 printf_filtered ("expanding to full symbols...");
600 for (psymtab
= objfile
-> psymtabs
;
602 psymtab
= psymtab
-> next
)
604 psymtab_to_symtab (psymtab
);
608 if (from_tty
|| info_verbose
)
610 printf_filtered ("done.\n");
617 /* This is the symbol-file command. Read the file, analyze its symbols,
618 and add a struct symtab to a symtab list. */
621 symbol_file_command (args
, from_tty
)
627 struct cleanup
*cleanups
;
635 if ((have_full_symbols () || have_partial_symbols ())
637 && !query ("Discard symbol table from `%s'? ",
638 symfile_objfile
-> name
))
639 error ("Not confirmed.");
640 free_all_objfiles ();
641 symfile_objfile
= NULL
;
642 current_source_symtab
= NULL
;
643 current_source_line
= 0;
646 printf_filtered ("No symbol file now.\n");
651 if ((argv
= buildargv (args
)) == NULL
)
655 cleanups
= make_cleanup (freeargv
, (char *) argv
);
656 while (*argv
!= NULL
)
658 if (strcmp (*argv
, "-mapped") == 0)
662 else if (strcmp (*argv
, "-readnow") == 0)
666 else if (**argv
== '-')
668 error ("unknown option `%s'", *argv
);
679 error ("no symbol file name was specified");
683 symbol_file_add (name
, from_tty
, (CORE_ADDR
)0, 1, mapped
, readnow
);
685 do_cleanups (cleanups
);
689 /* Open file specified by NAME and hand it off to BFD for preliminary
690 analysis. Result is a newly initialized bfd *, which includes a newly
691 malloc'd` copy of NAME (tilde-expanded and made absolute).
692 In case of trouble, error() is called. */
695 symfile_bfd_open (name
)
702 name
= tilde_expand (name
); /* Returns 1st new malloc'd copy */
704 /* Look down path for it, allocate 2nd new malloc'd copy. */
705 desc
= openp (getenv ("PATH"), 1, name
, O_RDONLY
, 0, &absolute_name
);
708 make_cleanup (free
, name
);
709 perror_with_name (name
);
711 free (name
); /* Free 1st new malloc'd copy */
712 name
= absolute_name
; /* Keep 2nd malloc'd copy in bfd */
713 /* It'll be freed in free_objfile(). */
715 sym_bfd
= bfd_fdopenr (name
, NULL
, desc
);
719 make_cleanup (free
, name
);
720 error ("\"%s\": can't open to read symbols: %s.", name
,
721 bfd_errmsg (bfd_error
));
724 if (!bfd_check_format (sym_bfd
, bfd_object
))
726 bfd_close (sym_bfd
); /* This also closes desc */
727 make_cleanup (free
, name
);
728 error ("\"%s\": can't read symbols: %s.", name
,
729 bfd_errmsg (bfd_error
));
735 /* Link a new symtab_fns into the global symtab_fns list. Called on gdb
736 startup by the _initialize routine in each object file format reader,
737 to register information about each format the the reader is prepared
744 sf
->next
= symtab_fns
;
749 /* Initialize to read symbols from the symbol file sym_bfd. It either
750 returns or calls error(). The result is an initialized struct sym_fns
751 in the objfile structure, that contains cached information about the
755 find_sym_fns (objfile
)
756 struct objfile
*objfile
;
760 for (sf
= symtab_fns
; sf
!= NULL
; sf
= sf
-> next
)
762 if (strncmp (bfd_get_target (objfile
-> obfd
),
763 sf
-> sym_name
, sf
-> sym_namelen
) == 0)
769 error ("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown.",
770 bfd_get_target (objfile
-> obfd
));
773 /* This function runs the load command of our current target. */
776 load_command (arg
, from_tty
)
780 target_load (arg
, from_tty
);
783 /* This function allows the addition of incrementally linked object files.
784 It does not modify any state in the target, only in the debugger. */
788 add_symbol_file_command (args
, from_tty
)
802 error ("add-symbol-file takes a file name and an address");
805 /* Make a copy of the string that we can safely write into. */
807 args
= strdup (args
);
808 make_cleanup (free
, args
);
810 /* Pick off any -option args and the file name. */
812 while ((*args
!= '\000') && (name
== NULL
))
814 while (isspace (*args
)) {args
++;}
816 while ((*args
!= '\000') && !isspace (*args
)) {args
++;}
825 else if (strcmp (arg
, "-mapped") == 0)
829 else if (strcmp (arg
, "-readnow") == 0)
835 error ("unknown option `%s'", arg
);
839 /* After picking off any options and the file name, args should be
840 left pointing at the remainder of the command line, which should
841 be the address expression to evaluate. */
843 if ((name
== NULL
) || (*args
== '\000') )
845 error ("add-symbol-file takes a file name and an address");
847 name
= tilde_expand (name
);
848 make_cleanup (free
, name
);
850 text_addr
= parse_and_eval_address (args
);
852 if (!query ("add symbol table from file \"%s\" at text_addr = %s?\n",
853 name
, local_hex_string (text_addr
)))
854 error ("Not confirmed.");
856 symbol_file_add (name
, 0, text_addr
, 0, mapped
, readnow
);
859 /* Re-read symbols if a symbol-file has changed. */
863 struct objfile
*objfile
;
866 struct stat new_statbuf
;
869 /* With the addition of shared libraries, this should be modified,
870 the load time should be saved in the partial symbol tables, since
871 different tables may come from different source files. FIXME.
872 This routine should then walk down each partial symbol table
873 and see if the symbol table that it originates from has been changed */
876 for (objfile
= object_files
; objfile
; objfile
= objfile
->next
) {
878 #ifdef IBM6000_TARGET
879 /* If this object is from a shared library, then you should
880 stat on the library name, not member name. */
882 if (objfile
->obfd
->my_archive
)
883 res
= stat (objfile
->obfd
->my_archive
->filename
, &new_statbuf
);
886 res
= stat (objfile
->name
, &new_statbuf
);
888 /* FIXME, should use print_sys_errmsg but it's not filtered. */
889 printf_filtered ("`%s' has disappeared; keeping its symbols.\n",
893 new_modtime
= new_statbuf
.st_mtime
;
894 if (new_modtime
!= objfile
->mtime
) {
895 printf_filtered ("`%s' has changed; re-reading symbols.\n",
897 /* FIXME, this should use a different command...that would only
898 affect this objfile's symbols, and would reset objfile->mtime.
899 (objfile->mtime = new_modtime;)
900 HOWEVER, that command isn't written yet -- so call symbol_file_
901 command, and restart the scan from the top, because it munges
902 the object_files list. */
903 symbol_file_command (objfile
->name
, 0);
905 goto the_big_top
; /* Start over. */
911 breakpoint_re_set ();
914 /* Functions to handle complaints during symbol reading. */
916 /* How many complaints about a particular thing should be printed before
917 we stop whining about it? Default is no whining at all, since so many
918 systems have ill-constructed symbol files. */
920 static unsigned stop_whining
= 0;
922 /* Should each complaint be self explanatory, or should we assume that
923 a series of complaints is being produced?
924 case 0: self explanatory message.
925 case 1: First message of a series that must start off with explanation.
926 case 2: Subsequent message, when user already knows we are reading
927 symbols and we can just state our piece. */
929 static int complaint_series
= 0;
931 /* Print a complaint about the input symbols, and link the complaint block
932 into a chain for later handling. */
935 complain (complaint
, val
)
936 struct complaint
*complaint
;
939 complaint
->counter
++;
940 if (complaint
->next
== 0) {
941 complaint
->next
= complaint_root
->next
;
942 complaint_root
->next
= complaint
;
944 if (complaint
->counter
> stop_whining
)
948 switch (complaint_series
+ (info_verbose
<< 1)) {
950 /* Isolated messages, must be self-explanatory. */
952 puts_filtered ("During symbol reading, ");
954 printf_filtered (complaint
->message
, val
);
955 puts_filtered (".\n");
958 /* First of a series, without `set verbose'. */
960 puts_filtered ("During symbol reading...");
961 printf_filtered (complaint
->message
, val
);
962 puts_filtered ("...");
967 /* Subsequent messages of a series, or messages under `set verbose'.
968 (We'll already have produced a "Reading in symbols for XXX..." message
969 and will clean up at the end with a newline.) */
971 printf_filtered (complaint
->message
, val
);
972 puts_filtered ("...");
977 /* Clear out all complaint counters that have ever been incremented.
978 If sym_reading is 1, be less verbose about successive complaints,
979 since the messages are appearing all together during a command that
980 reads symbols (rather than scattered around as psymtabs get fleshed
981 out into symtabs at random times). If noisy is 1, we are in a
982 noisy symbol reading command, and our caller will print enough
983 context for the user to figure it out. */
986 clear_complaints (sym_reading
, noisy
)
992 for (p
= complaint_root
->next
; p
!= complaint_root
; p
= p
->next
)
995 if (!sym_reading
&& !noisy
&& complaint_series
> 1) {
996 /* Terminate previous series, since caller won't. */
997 puts_filtered ("\n");
1000 complaint_series
= sym_reading
? 1 + noisy
: 0;
1004 deduce_language_from_filename (filename
)
1007 char *c
= strrchr (filename
, '.');
1009 if (!c
) ; /* Get default. */
1010 else if(!strcmp(c
,".mod"))
1012 else if(!strcmp(c
,".c"))
1014 else if(!strcmp(c
,".cc") || !strcmp(c
,".C"))
1015 return language_cplus
;
1017 return language_unknown
; /* default */
1022 Allocate and partly initialize a new symbol table. Return a pointer
1023 to it. error() if no space.
1025 Caller must set these fields:
1031 initialize any EXTRA_SYMTAB_INFO
1032 possibly free_named_symtabs (symtab->filename);
1036 allocate_symtab (filename
, objfile
)
1038 struct objfile
*objfile
;
1040 register struct symtab
*symtab
;
1042 symtab
= (struct symtab
*)
1043 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symtab
));
1044 memset (symtab
, 0, sizeof (*symtab
));
1045 symtab
-> filename
= obsavestring (filename
, strlen (filename
),
1046 &objfile
-> symbol_obstack
);
1047 symtab
-> fullname
= NULL
;
1048 symtab
-> language
= deduce_language_from_filename (filename
);
1050 /* Hook it to the objfile it comes from */
1052 symtab
-> objfile
= objfile
;
1053 symtab
-> next
= objfile
-> symtabs
;
1054 objfile
-> symtabs
= symtab
;
1056 #ifdef INIT_EXTRA_SYMTAB_INFO
1057 INIT_EXTRA_SYMTAB_INFO (symtab
);
1063 struct partial_symtab
*
1064 allocate_psymtab (filename
, objfile
)
1066 struct objfile
*objfile
;
1068 struct partial_symtab
*psymtab
;
1070 if (objfile
-> free_psymtabs
)
1072 psymtab
= objfile
-> free_psymtabs
;
1073 objfile
-> free_psymtabs
= psymtab
-> next
;
1076 psymtab
= (struct partial_symtab
*)
1077 obstack_alloc (&objfile
-> psymbol_obstack
,
1078 sizeof (struct partial_symtab
));
1080 memset (psymtab
, 0, sizeof (struct partial_symtab
));
1081 psymtab
-> filename
= obsavestring (filename
, strlen (filename
),
1082 &objfile
-> psymbol_obstack
);
1083 psymtab
-> symtab
= NULL
;
1085 /* Hook it to the objfile it comes from */
1087 psymtab
-> objfile
= objfile
;
1088 psymtab
-> next
= objfile
-> psymtabs
;
1089 objfile
-> psymtabs
= psymtab
;
1095 /* clear_symtab_users_once:
1097 This function is run after symbol reading, or from a cleanup.
1098 If an old symbol table was obsoleted, the old symbol table
1099 has been blown away, but the other GDB data structures that may
1100 reference it have not yet been cleared or re-directed. (The old
1101 symtab was zapped, and the cleanup queued, in free_named_symtab()
1104 This function can be queued N times as a cleanup, or called
1105 directly; it will do all the work the first time, and then will be a
1106 no-op until the next time it is queued. This works by bumping a
1107 counter at queueing time. Much later when the cleanup is run, or at
1108 the end of symbol processing (in case the cleanup is discarded), if
1109 the queued count is greater than the "done-count", we do the work
1110 and set the done-count to the queued count. If the queued count is
1111 less than or equal to the done-count, we just ignore the call. This
1112 is needed because reading a single .o file will often replace many
1113 symtabs (one per .h file, for example), and we don't want to reset
1114 the breakpoints N times in the user's face.
1116 The reason we both queue a cleanup, and call it directly after symbol
1117 reading, is because the cleanup protects us in case of errors, but is
1118 discarded if symbol reading is successful. */
1120 static int clear_symtab_users_queued
;
1121 static int clear_symtab_users_done
;
1124 clear_symtab_users_once ()
1126 /* Enforce once-per-`do_cleanups'-semantics */
1127 if (clear_symtab_users_queued
<= clear_symtab_users_done
)
1129 clear_symtab_users_done
= clear_symtab_users_queued
;
1131 printf_filtered ("Resetting debugger state after updating old symbol tables\n");
1133 /* Someday, we should do better than this, by only blowing away
1134 the things that really need to be blown. */
1135 clear_value_history ();
1137 clear_internalvars ();
1138 breakpoint_re_set ();
1139 set_default_breakpoint (0, 0, 0, 0);
1140 current_source_symtab
= 0;
1143 /* Delete the specified psymtab, and any others that reference it. */
1146 cashier_psymtab (pst
)
1147 struct partial_symtab
*pst
;
1149 struct partial_symtab
*ps
, *pprev
;
1152 /* Find its previous psymtab in the chain */
1153 for (ps
= pst
->objfile
->psymtabs
; ps
; ps
= ps
->next
) {
1160 /* Unhook it from the chain. */
1161 if (ps
== pst
->objfile
->psymtabs
)
1162 pst
->objfile
->psymtabs
= ps
->next
;
1164 pprev
->next
= ps
->next
;
1166 /* FIXME, we can't conveniently deallocate the entries in the
1167 partial_symbol lists (global_psymbols/static_psymbols) that
1168 this psymtab points to. These just take up space until all
1169 the psymtabs are reclaimed. Ditto the dependencies list and
1170 filename, which are all in the psymbol_obstack. */
1172 /* We need to cashier any psymtab that has this one as a dependency... */
1174 for (ps
= pst
->objfile
->psymtabs
; ps
; ps
= ps
->next
) {
1175 for (i
= 0; i
< ps
->number_of_dependencies
; i
++) {
1176 if (ps
->dependencies
[i
] == pst
) {
1177 cashier_psymtab (ps
);
1178 goto again
; /* Must restart, chain has been munged. */
1185 /* If a symtab or psymtab for filename NAME is found, free it along
1186 with any dependent breakpoints, displays, etc.
1187 Used when loading new versions of object modules with the "add-file"
1188 command. This is only called on the top-level symtab or psymtab's name;
1189 it is not called for subsidiary files such as .h files.
1191 Return value is 1 if we blew away the environment, 0 if not.
1192 FIXME. The return valu appears to never be used.
1194 FIXME. I think this is not the best way to do this. We should
1195 work on being gentler to the environment while still cleaning up
1196 all stray pointers into the freed symtab. */
1199 free_named_symtabs (name
)
1203 /* FIXME: With the new method of each objfile having it's own
1204 psymtab list, this function needs serious rethinking. In particular,
1205 why was it ever necessary to toss psymtabs with specific compilation
1206 unit filenames, as opposed to all psymtabs from a particular symbol
1208 Well, the answer is that some systems permit reloading of particular
1209 compilation units. We want to blow away any old info about these
1210 compilation units, regardless of which objfiles they arrived in. --gnu. */
1212 register struct symtab
*s
;
1213 register struct symtab
*prev
;
1214 register struct partial_symtab
*ps
;
1215 struct blockvector
*bv
;
1218 /* We only wack things if the symbol-reload switch is set. */
1219 if (!symbol_reloading
)
1222 /* Some symbol formats have trouble providing file names... */
1223 if (name
== 0 || *name
== '\0')
1226 /* Look for a psymtab with the specified name. */
1229 for (ps
= partial_symtab_list
; ps
; ps
= ps
->next
) {
1230 if (!strcmp (name
, ps
->filename
)) {
1231 cashier_psymtab (ps
); /* Blow it away...and its little dog, too. */
1232 goto again2
; /* Must restart, chain has been munged */
1236 /* Look for a symtab with the specified name. */
1238 for (s
= symtab_list
; s
; s
= s
->next
)
1240 if (!strcmp (name
, s
->filename
))
1247 if (s
== symtab_list
)
1248 symtab_list
= s
->next
;
1250 prev
->next
= s
->next
;
1252 /* For now, queue a delete for all breakpoints, displays, etc., whether
1253 or not they depend on the symtab being freed. This should be
1254 changed so that only those data structures affected are deleted. */
1256 /* But don't delete anything if the symtab is empty.
1257 This test is necessary due to a bug in "dbxread.c" that
1258 causes empty symtabs to be created for N_SO symbols that
1259 contain the pathname of the object file. (This problem
1260 has been fixed in GDB 3.9x). */
1262 bv
= BLOCKVECTOR (s
);
1263 if (BLOCKVECTOR_NBLOCKS (bv
) > 2
1264 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv
, GLOBAL_BLOCK
))
1265 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv
, STATIC_BLOCK
)))
1267 complain (&oldsyms_complaint
, name
);
1269 clear_symtab_users_queued
++;
1270 make_cleanup (clear_symtab_users_once
, 0);
1273 complain (&empty_symtab_complaint
, name
);
1280 /* It is still possible that some breakpoints will be affected
1281 even though no symtab was found, since the file might have
1282 been compiled without debugging, and hence not be associated
1283 with a symtab. In order to handle this correctly, we would need
1284 to keep a list of text address ranges for undebuggable files.
1285 For now, we do nothing, since this is a fairly obscure case. */
1289 /* FIXME, what about the minimal symbol table? */
1296 /* Allocate and partially fill a partial symtab. It will be
1297 completely filled at the end of the symbol list.
1299 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
1300 is the address relative to which its symbols are (incremental) or 0
1304 struct partial_symtab
*
1305 start_psymtab_common (objfile
, section_offsets
,
1306 filename
, textlow
, global_syms
, static_syms
)
1307 struct objfile
*objfile
;
1308 struct section_offsets
*section_offsets
;
1311 struct partial_symbol
*global_syms
;
1312 struct partial_symbol
*static_syms
;
1314 struct partial_symtab
*psymtab
;
1316 psymtab
= allocate_psymtab (filename
, objfile
);
1317 psymtab
-> section_offsets
= section_offsets
;
1318 psymtab
-> textlow
= textlow
;
1319 psymtab
-> texthigh
= psymtab
-> textlow
; /* default */
1320 psymtab
-> globals_offset
= global_syms
- objfile
-> global_psymbols
.list
;
1321 psymtab
-> statics_offset
= static_syms
- objfile
-> static_psymbols
.list
;
1325 /* Debugging versions of functions that are usually inline macros
1328 #if 0 /* Don't quite work nowadays... */
1330 /* Add a symbol with a long value to a psymtab.
1331 Since one arg is a struct, we pass in a ptr and deref it (sigh). */
1334 add_psymbol_to_list (name
, namelength
, namespace, class, list
, val
)
1337 enum namespace namespace;
1338 enum address_class
class;
1339 struct psymbol_allocation_list
*list
;
1342 ADD_PSYMBOL_VT_TO_LIST (name
, namelength
, namespace, class, (*list
), val
,
1346 /* Add a symbol with a CORE_ADDR value to a psymtab. */
1349 add_psymbol_addr_to_list (name
, namelength
, namespace, class, list
, val
)
1352 enum namespace namespace;
1353 enum address_class
class;
1354 struct psymbol_allocation_list
*list
;
1357 ADD_PSYMBOL_VT_TO_LIST (name
, namelength
, namespace, class, (*list
), val
,
1358 SYMBOL_VALUE_ADDRESS
);
1364 _initialize_symfile ()
1367 add_com ("symbol-file", class_files
, symbol_file_command
,
1368 "Load symbol table from executable file FILE.\n\
1369 The `file' command can also load symbol tables, as well as setting the file\n\
1372 add_com ("add-symbol-file", class_files
, add_symbol_file_command
,
1373 "Load the symbols from FILE, assuming FILE has been dynamically loaded.\n\
1374 The second argument provides the starting address of the file's text.");
1376 add_com ("load", class_files
, load_command
,
1377 "Dynamically load FILE into the running program, and record its symbols\n\
1378 for access from GDB.");
1381 (add_set_cmd ("complaints", class_support
, var_zinteger
,
1382 (char *)&stop_whining
,
1383 "Set max number of complaints about incorrect symbols.",
1388 (add_set_cmd ("symbol-reloading", class_support
, var_boolean
,
1389 (char *)&symbol_reloading
,
1390 "Set dynamic symbol table reloading multiple times in one run.",