1 /* List lines of source files for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
3 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008,
4 2009, 2010, 2011 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "arch-utils.h"
24 #include "expression.h"
31 #include "gdb_assert.h"
33 #include <sys/types.h>
34 #include "gdb_string.h"
38 #include "gdb_regex.h"
44 #include "filenames.h" /* for DOSish file names */
45 #include "completer.h"
47 #include "readline/readline.h"
52 #define OPEN_MODE (O_RDONLY | O_BINARY)
53 #define FDOPEN_MODE FOPEN_RB
55 /* Prototypes for exported functions. */
57 void _initialize_source (void);
59 /* Prototypes for local functions. */
61 static int get_filename_and_charpos (struct symtab
*, char **);
63 static void reverse_search_command (char *, int);
65 static void forward_search_command (char *, int);
67 static void line_info (char *, int);
69 static void source_info (char *, int);
71 /* Path of directories to search for source files.
72 Same format as the PATH environment variable's value. */
76 /* Support for source path substitution commands. */
78 struct substitute_path_rule
82 struct substitute_path_rule
*next
;
85 static struct substitute_path_rule
*substitute_path_rules
= NULL
;
87 /* Symtab of default file for listing lines of. */
89 static struct symtab
*current_source_symtab
;
91 /* Default next line to list. */
93 static int current_source_line
;
95 static struct program_space
*current_source_pspace
;
97 /* Default number of lines to print with commands like "list".
98 This is based on guessing how many long (i.e. more than chars_per_line
99 characters) lines there will be. To be completely correct, "list"
100 and friends should be rewritten to count characters and see where
101 things are wrapping, but that would be a fair amount of work. */
103 int lines_to_list
= 10;
105 show_lines_to_list (struct ui_file
*file
, int from_tty
,
106 struct cmd_list_element
*c
, const char *value
)
108 fprintf_filtered (file
,
109 _("Number of source lines gdb "
110 "will list by default is %s.\n"),
114 /* Line number of last line printed. Default for various commands.
115 current_source_line is usually, but not always, the same as this. */
117 static int last_line_listed
;
119 /* First line number listed by last listing command. */
121 static int first_line_listed
;
123 /* Saves the name of the last source file visited and a possible error code.
124 Used to prevent repeating annoying "No such file or directories" msgs. */
126 static struct symtab
*last_source_visited
= NULL
;
127 static int last_source_error
= 0;
129 /* Return the first line listed by print_source_lines.
130 Used by command interpreters to request listing from
134 get_first_line_listed (void)
136 return first_line_listed
;
139 /* Return the default number of lines to print with commands like the
140 cli "list". The caller of print_source_lines must use this to
141 calculate the end line and use it in the call to print_source_lines
142 as it does not automatically use this value. */
145 get_lines_to_list (void)
147 return lines_to_list
;
150 /* Return the current source file for listing and next line to list.
151 NOTE: The returned sal pc and end fields are not valid. */
153 struct symtab_and_line
154 get_current_source_symtab_and_line (void)
156 struct symtab_and_line cursal
= { 0 };
158 cursal
.pspace
= current_source_pspace
;
159 cursal
.symtab
= current_source_symtab
;
160 cursal
.line
= current_source_line
;
167 /* If the current source file for listing is not set, try and get a default.
168 Usually called before get_current_source_symtab_and_line() is called.
169 It may err out if a default cannot be determined.
170 We must be cautious about where it is called, as it can recurse as the
171 process of determining a new default may call the caller!
172 Use get_current_source_symtab_and_line only to get whatever
173 we have without erroring out or trying to get a default. */
176 set_default_source_symtab_and_line (void)
178 if (!have_full_symbols () && !have_partial_symbols ())
179 error (_("No symbol table is loaded. Use the \"file\" command."));
181 /* Pull in a current source symtab if necessary. */
182 if (current_source_symtab
== 0)
183 select_source_symtab (0);
186 /* Return the current default file for listing and next line to list
187 (the returned sal pc and end fields are not valid.)
188 and set the current default to whatever is in SAL.
189 NOTE: The returned sal pc and end fields are not valid. */
191 struct symtab_and_line
192 set_current_source_symtab_and_line (const struct symtab_and_line
*sal
)
194 struct symtab_and_line cursal
= { 0 };
196 cursal
.pspace
= current_source_pspace
;
197 cursal
.symtab
= current_source_symtab
;
198 cursal
.line
= current_source_line
;
202 current_source_pspace
= sal
->pspace
;
203 current_source_symtab
= sal
->symtab
;
204 current_source_line
= sal
->line
;
209 /* Reset any information stored about a default file and line to print. */
212 clear_current_source_symtab_and_line (void)
214 current_source_symtab
= 0;
215 current_source_line
= 0;
218 /* Set the source file default for the "list" command to be S.
220 If S is NULL, and we don't have a default, find one. This
221 should only be called when the user actually tries to use the
222 default, since we produce an error if we can't find a reasonable
223 default. Also, since this can cause symbols to be read, doing it
224 before we need to would make things slower than necessary. */
227 select_source_symtab (struct symtab
*s
)
229 struct symtabs_and_lines sals
;
230 struct symtab_and_line sal
;
235 current_source_symtab
= s
;
236 current_source_line
= 1;
237 current_source_pspace
= SYMTAB_PSPACE (s
);
241 if (current_source_symtab
)
244 /* Make the default place to list be the function `main'
246 if (lookup_symbol (main_name (), 0, VAR_DOMAIN
, 0))
248 sals
= decode_line_spec (main_name (), 1);
251 current_source_pspace
= sal
.pspace
;
252 current_source_symtab
= sal
.symtab
;
253 current_source_line
= max (sal
.line
- (lines_to_list
- 1), 1);
254 if (current_source_symtab
)
258 /* Alright; find the last file in the symtab list (ignoring .h's
259 and namespace symtabs). */
261 current_source_line
= 1;
265 for (s
= ofp
->symtabs
; s
; s
= s
->next
)
267 const char *name
= s
->filename
;
268 int len
= strlen (name
);
270 if (!(len
> 2 && (strcmp (&name
[len
- 2], ".h") == 0
271 || strcmp (name
, "<<C++-namespaces>>") == 0)))
273 current_source_pspace
= current_program_space
;
274 current_source_symtab
= s
;
279 if (current_source_symtab
)
285 s
= ofp
->sf
->qf
->find_last_source_symtab (ofp
);
287 current_source_symtab
= s
;
289 if (current_source_symtab
)
292 error (_("Can't find a default source file"));
295 /* Handler for "set directories path-list" command.
296 "set dir mumble" doesn't prepend paths, it resets the entire
297 path list. The theory is that set(show(dir)) should be a no-op. */
300 set_directories_command (char *args
, int from_tty
, struct cmd_list_element
*c
)
302 /* This is the value that was set.
303 It needs to be processed to maintain $cdir:$cwd and remove dups. */
304 char *set_path
= source_path
;
306 /* We preserve the invariant that $cdir:$cwd begins life at the end of
307 the list by calling init_source_path. If they appear earlier in
308 SET_PATH then mod_path will move them appropriately.
309 mod_path will also remove duplicates. */
311 if (*set_path
!= '\0')
312 mod_path (set_path
, &source_path
);
317 /* Print the list of source directories.
318 This is used by the "ld" command, so it has the signature of a command
322 show_directories_1 (char *ignore
, int from_tty
)
324 puts_filtered ("Source directories searched: ");
325 puts_filtered (source_path
);
326 puts_filtered ("\n");
329 /* Handler for "show directories" command. */
332 show_directories_command (struct ui_file
*file
, int from_tty
,
333 struct cmd_list_element
*c
, const char *value
)
335 show_directories_1 (NULL
, from_tty
);
338 /* Forget what we learned about line positions in source files, and
339 which directories contain them; must check again now since files
340 may be found in a different directory now. */
343 forget_cached_source_info (void)
345 struct program_space
*pspace
;
347 struct objfile
*objfile
;
350 ALL_PSPACE_OBJFILES (pspace
, objfile
)
352 for (s
= objfile
->symtabs
; s
!= NULL
; s
= s
->next
)
354 if (s
->line_charpos
!= NULL
)
356 xfree (s
->line_charpos
);
357 s
->line_charpos
= NULL
;
359 if (s
->fullname
!= NULL
)
367 objfile
->sf
->qf
->forget_cached_source_info (objfile
);
370 last_source_visited
= NULL
;
374 init_source_path (void)
378 sprintf (buf
, "$cdir%c$cwd", DIRNAME_SEPARATOR
);
379 source_path
= xstrdup (buf
);
380 forget_cached_source_info ();
383 /* Add zero or more directories to the front of the source path. */
386 directory_command (char *dirname
, int from_tty
)
389 /* FIXME, this goes to "delete dir"... */
392 if (!from_tty
|| query (_("Reinitialize source path to empty? ")))
400 mod_path (dirname
, &source_path
);
401 forget_cached_source_info ();
404 show_directories_1 ((char *) 0, from_tty
);
407 /* Add a path given with the -d command line switch.
408 This will not be quoted so we must not treat spaces as separators. */
411 directory_switch (char *dirname
, int from_tty
)
413 add_path (dirname
, &source_path
, 0);
416 /* Add zero or more directories to the front of an arbitrary path. */
419 mod_path (char *dirname
, char **which_path
)
421 add_path (dirname
, which_path
, 1);
424 /* Workhorse of mod_path. Takes an extra argument to determine
425 if dirname should be parsed for separators that indicate multiple
426 directories. This allows for interfaces that pre-parse the dirname
427 and allow specification of traditional separator characters such
431 add_path (char *dirname
, char **which_path
, int parse_separators
)
433 char *old
= *which_path
;
442 if (parse_separators
)
444 /* This will properly parse the space and tab separators
445 and any quotes that may exist. DIRNAME_SEPARATOR will
446 be dealt with later. */
447 argv
= gdb_buildargv (dirname
);
448 make_cleanup_freeargv (argv
);
454 arg
= xstrdup (dirname
);
455 make_cleanup (xfree
, arg
);
465 char *separator
= NULL
;
467 /* Spaces and tabs will have been removed by buildargv().
468 The directories will there be split into a list but
469 each entry may still contain DIRNAME_SEPARATOR. */
470 if (parse_separators
)
471 separator
= strchr (name
, DIRNAME_SEPARATOR
);
474 p
= arg
= name
+ strlen (name
);
479 while (*arg
== DIRNAME_SEPARATOR
)
483 /* If there are no more directories in this argument then start
484 on the next argument next time round the loop (if any). */
486 arg
= parse_separators
? argv
[++argv_index
] : NULL
;
489 /* name is the start of the directory.
490 p is the separator (or null) following the end. */
492 while (!(IS_DIR_SEPARATOR (*name
) && p
<= name
+ 1) /* "/" */
493 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
494 /* On MS-DOS and MS-Windows, h:\ is different from h: */
495 && !(p
== name
+ 3 && name
[1] == ':') /* "d:/" */
497 && IS_DIR_SEPARATOR (p
[-1]))
498 /* Sigh. "foo/" => "foo" */
502 while (p
> name
&& p
[-1] == '.')
506 /* "." => getwd (). */
507 name
= current_directory
;
510 else if (p
> name
+ 1 && IS_DIR_SEPARATOR (p
[-2]))
520 /* "...foo/." => "...foo". */
531 name
= tilde_expand (name
);
532 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
533 else if (IS_ABSOLUTE_PATH (name
) && p
== name
+ 2) /* "d:" => "d:." */
534 name
= concat (name
, ".", (char *)NULL
);
536 else if (!IS_ABSOLUTE_PATH (name
) && name
[0] != '$')
537 name
= concat (current_directory
, SLASH_STRING
, name
, (char *)NULL
);
539 name
= savestring (name
, p
- name
);
540 make_cleanup (xfree
, name
);
542 /* Unless it's a variable, check existence. */
545 /* These are warnings, not errors, since we don't want a
546 non-existent directory in a .gdbinit file to stop processing
547 of the .gdbinit file.
549 Whether they get added to the path is more debatable. Current
550 answer is yes, in case the user wants to go make the directory
551 or whatever. If the directory continues to not exist/not be
552 a directory/etc, then having them in the path should be
554 if (stat (name
, &st
) < 0)
556 int save_errno
= errno
;
558 fprintf_unfiltered (gdb_stderr
, "Warning: ");
559 print_sys_errmsg (name
, save_errno
);
561 else if ((st
.st_mode
& S_IFMT
) != S_IFDIR
)
562 warning (_("%s is not a directory."), name
);
567 unsigned int len
= strlen (name
);
572 /* FIXME: we should use realpath() or its work-alike
573 before comparing. Then all the code above which
574 removes excess slashes and dots could simply go away. */
575 if (!filename_ncmp (p
, name
, len
)
576 && (p
[len
] == '\0' || p
[len
] == DIRNAME_SEPARATOR
))
578 /* Found it in the search path, remove old copy. */
580 p
--; /* Back over leading separator. */
581 if (prefix
> p
- *which_path
)
582 goto skip_dup
; /* Same dir twice in one cmd. */
583 strcpy (p
, &p
[len
+ 1]); /* Copy from next \0 or : */
585 p
= strchr (p
, DIRNAME_SEPARATOR
);
595 tinybuf
[0] = DIRNAME_SEPARATOR
;
598 /* If we have already tacked on a name(s) in this command,
599 be sure they stay on the front as we tack on some
607 temp
= concat (old
, tinybuf
, name
, (char *)NULL
);
609 *which_path
= concat (temp
, "", &old
[prefix
], (char *) NULL
);
610 prefix
= strlen (temp
);
615 *which_path
= concat (name
, (old
[0] ? tinybuf
: old
),
617 prefix
= strlen (name
);
631 source_info (char *ignore
, int from_tty
)
633 struct symtab
*s
= current_source_symtab
;
637 printf_filtered (_("No current source file.\n"));
640 printf_filtered (_("Current source file is %s\n"), s
->filename
);
642 printf_filtered (_("Compilation directory is %s\n"), s
->dirname
);
644 printf_filtered (_("Located in %s\n"), s
->fullname
);
646 printf_filtered (_("Contains %d line%s.\n"), s
->nlines
,
647 s
->nlines
== 1 ? "" : "s");
649 printf_filtered (_("Source language is %s.\n"), language_str (s
->language
));
650 printf_filtered (_("Compiled with %s debugging format.\n"), s
->debugformat
);
651 printf_filtered (_("%s preprocessor macro info.\n"),
652 s
->macro_table
? "Includes" : "Does not include");
656 /* Return True if the file NAME exists and is a regular file. */
658 is_regular_file (const char *name
)
661 const int status
= stat (name
, &st
);
663 /* Stat should never fail except when the file does not exist.
664 If stat fails, analyze the source of error and return True
665 unless the file does not exist, to avoid returning false results
666 on obscure systems where stat does not work as expected. */
669 return (errno
!= ENOENT
);
671 return S_ISREG (st
.st_mode
);
674 /* Open a file named STRING, searching path PATH (dir names sep by some char)
675 using mode MODE in the calls to open. You cannot use this function to
676 create files (O_CREAT).
678 OPTS specifies the function behaviour in specific cases.
680 If OPF_TRY_CWD_FIRST, try to open ./STRING before searching PATH.
681 (ie pretend the first element of PATH is "."). This also indicates
682 that a slash in STRING disables searching of the path (this is
683 so that "exec-file ./foo" or "symbol-file ./foo" insures that you
684 get that particular version of foo or an error message).
686 If OPTS has OPF_SEARCH_IN_PATH set, absolute names will also be
687 searched in path (we usually want this for source files but not for
690 If FILENAME_OPENED is non-null, set it to a newly allocated string naming
691 the actual file opened (this string will always start with a "/"). We
692 have to take special pains to avoid doubling the "/" between the directory
693 and the file, sigh! Emacs gets confuzzed by this when we print the
696 If a file is found, return the descriptor.
697 Otherwise, return -1, with errno set for the last name we tried to open. */
699 /* >>>> This should only allow files of certain types,
700 >>>> eg executable, non-directory. */
702 openp (const char *path
, int opts
, const char *string
,
703 int mode
, char **filename_opened
)
712 /* The open syscall MODE parameter is not specified. */
713 gdb_assert ((mode
& O_CREAT
) == 0);
714 gdb_assert (string
!= NULL
);
716 /* A file with an empty name cannot possibly exist. Report a failure
717 without further checking.
719 This is an optimization which also defends us against buggy
720 implementations of the "stat" function. For instance, we have
721 noticed that a MinGW debugger built on Windows XP 32bits crashes
722 when the debugger is started with an empty argument. */
723 if (string
[0] == '\0')
734 if ((opts
& OPF_TRY_CWD_FIRST
) || IS_ABSOLUTE_PATH (string
))
738 if (is_regular_file (string
))
740 filename
= alloca (strlen (string
) + 1);
741 strcpy (filename
, string
);
742 fd
= open (filename
, mode
);
752 if (!(opts
& OPF_SEARCH_IN_PATH
))
753 for (i
= 0; string
[i
]; i
++)
754 if (IS_DIR_SEPARATOR (string
[i
]))
758 /* For dos paths, d:/foo -> /foo, and d:foo -> foo. */
759 if (HAS_DRIVE_SPEC (string
))
760 string
= STRIP_DRIVE_SPEC (string
);
762 /* /foo => foo, to avoid multiple slashes that Emacs doesn't like. */
763 while (IS_DIR_SEPARATOR(string
[0]))
767 while (string
[0] == '.' && IS_DIR_SEPARATOR (string
[1]))
770 alloclen
= strlen (path
) + strlen (string
) + 2;
771 filename
= alloca (alloclen
);
773 for (p
= path
; p
; p
= p1
? p1
+ 1 : 0)
775 p1
= strchr (p
, DIRNAME_SEPARATOR
);
781 if (len
== 4 && p
[0] == '$' && p
[1] == 'c'
782 && p
[2] == 'w' && p
[3] == 'd')
784 /* Name is $cwd -- insert current directory name instead. */
787 /* First, realloc the filename buffer if too short. */
788 len
= strlen (current_directory
);
789 newlen
= len
+ strlen (string
) + 2;
790 if (newlen
> alloclen
)
793 filename
= alloca (alloclen
);
795 strcpy (filename
, current_directory
);
799 /* Normal file name in path -- just use it. */
800 strncpy (filename
, p
, len
);
803 /* Don't search $cdir. It's also a magic path like $cwd, but we
804 don't have enough information to expand it. The user *could*
805 have an actual directory named '$cdir' but handling that would
806 be confusing, it would mean different things in different
807 contexts. If the user really has '$cdir' one can use './$cdir'.
808 We can get $cdir when loading scripts. When loading source files
809 $cdir must have already been expanded to the correct value. */
810 if (strcmp (filename
, "$cdir") == 0)
814 /* Remove trailing slashes. */
815 while (len
> 0 && IS_DIR_SEPARATOR (filename
[len
- 1]))
818 strcat (filename
+ len
, SLASH_STRING
);
819 strcat (filename
, string
);
821 if (is_regular_file (filename
))
823 fd
= open (filename
, mode
);
832 /* If a file was opened, canonicalize its filename. Use xfullpath
833 rather than gdb_realpath to avoid resolving the basename part
834 of filenames when the associated file is a symbolic link. This
835 fixes a potential inconsistency between the filenames known to
836 GDB and the filenames it prints in the annotations. */
838 *filename_opened
= NULL
;
839 else if (IS_ABSOLUTE_PATH (filename
))
840 *filename_opened
= xfullpath (filename
);
843 /* Beware the // my son, the Emacs barfs, the botch that catch... */
845 char *f
= concat (current_directory
,
846 IS_DIR_SEPARATOR (current_directory
[strlen (current_directory
) - 1])
848 filename
, (char *)NULL
);
850 *filename_opened
= xfullpath (f
);
859 /* This is essentially a convenience, for clients that want the behaviour
860 of openp, using source_path, but that really don't want the file to be
861 opened but want instead just to know what the full pathname is (as
862 qualified against source_path).
864 The current working directory is searched first.
866 If the file was found, this function returns 1, and FULL_PATHNAME is
867 set to the fully-qualified pathname.
869 Else, this functions returns 0, and FULL_PATHNAME is set to NULL. */
871 source_full_path_of (const char *filename
, char **full_pathname
)
875 fd
= openp (source_path
, OPF_TRY_CWD_FIRST
| OPF_SEARCH_IN_PATH
, filename
,
876 O_RDONLY
, full_pathname
);
879 *full_pathname
= NULL
;
887 /* Return non-zero if RULE matches PATH, that is if the rule can be
891 substitute_path_rule_matches (const struct substitute_path_rule
*rule
,
894 const int from_len
= strlen (rule
->from
);
895 const int path_len
= strlen (path
);
898 if (path_len
< from_len
)
901 /* The substitution rules are anchored at the start of the path,
902 so the path should start with rule->from. There is no filename
903 comparison routine, so we need to extract the first FROM_LEN
904 characters from PATH first and use that to do the comparison. */
906 path_start
= alloca (from_len
+ 1);
907 strncpy (path_start
, path
, from_len
);
908 path_start
[from_len
] = '\0';
910 if (FILENAME_CMP (path_start
, rule
->from
) != 0)
913 /* Make sure that the region in the path that matches the substitution
914 rule is immediately followed by a directory separator (or the end of
915 string character). */
917 if (path
[from_len
] != '\0' && !IS_DIR_SEPARATOR (path
[from_len
]))
923 /* Find the substitute-path rule that applies to PATH and return it.
924 Return NULL if no rule applies. */
926 static struct substitute_path_rule
*
927 get_substitute_path_rule (const char *path
)
929 struct substitute_path_rule
*rule
= substitute_path_rules
;
931 while (rule
!= NULL
&& !substitute_path_rule_matches (rule
, path
))
937 /* If the user specified a source path substitution rule that applies
938 to PATH, then apply it and return the new path. This new path must
939 be deallocated afterwards.
941 Return NULL if no substitution rule was specified by the user,
942 or if no rule applied to the given PATH. */
945 rewrite_source_path (const char *path
)
947 const struct substitute_path_rule
*rule
= get_substitute_path_rule (path
);
954 from_len
= strlen (rule
->from
);
956 /* Compute the rewritten path and return it. */
959 (char *) xmalloc (strlen (path
) + 1 + strlen (rule
->to
) - from_len
);
960 strcpy (new_path
, rule
->to
);
961 strcat (new_path
, path
+ from_len
);
966 /* This function is capable of finding the absolute path to a
967 source file, and opening it, provided you give it a FILENAME. Both the
968 DIRNAME and FULLNAME are only added suggestions on where to find the file.
970 FILENAME should be the filename to open.
971 DIRNAME is the compilation directory of a particular source file.
972 Only some debug formats provide this info.
973 FULLNAME can be the last known absolute path to the file in question.
974 Space for the path must have been malloc'd. If a path substitution
975 is applied we free the old value and set a new one.
978 A valid file descriptor is returned (the return value is positive).
979 FULLNAME is set to the absolute path to the file just opened.
980 The caller is responsible for freeing FULLNAME.
983 An invalid file descriptor is returned (the return value is negative).
984 FULLNAME is set to NULL. */
987 find_and_open_source (const char *filename
,
991 char *path
= source_path
;
995 /* Quick way out if we already know its full name. */
999 /* The user may have requested that source paths be rewritten
1000 according to substitution rules he provided. If a substitution
1001 rule applies to this path, then apply it. */
1002 char *rewritten_fullname
= rewrite_source_path (*fullname
);
1004 if (rewritten_fullname
!= NULL
)
1007 *fullname
= rewritten_fullname
;
1010 result
= open (*fullname
, OPEN_MODE
);
1013 /* Didn't work -- free old one, try again. */
1018 if (dirname
!= NULL
)
1020 /* If necessary, rewrite the compilation directory name according
1021 to the source path substitution rules specified by the user. */
1023 char *rewritten_dirname
= rewrite_source_path (dirname
);
1025 if (rewritten_dirname
!= NULL
)
1027 make_cleanup (xfree
, rewritten_dirname
);
1028 dirname
= rewritten_dirname
;
1031 /* Replace a path entry of $cdir with the compilation directory
1034 /* We cast strstr's result in case an ANSIhole has made it const,
1035 which produces a "required warning" when assigned to a nonconst. */
1036 p
= (char *) strstr (source_path
, "$cdir");
1037 if (p
&& (p
== path
|| p
[-1] == DIRNAME_SEPARATOR
)
1038 && (p
[cdir_len
] == DIRNAME_SEPARATOR
|| p
[cdir_len
] == '\0'))
1043 alloca (strlen (source_path
) + 1 + strlen (dirname
) + 1);
1044 len
= p
- source_path
;
1045 strncpy (path
, source_path
, len
); /* Before $cdir */
1046 strcpy (path
+ len
, dirname
); /* new stuff */
1047 strcat (path
+ len
, source_path
+ len
+ cdir_len
); /* After
1052 if (IS_ABSOLUTE_PATH (filename
))
1054 /* If filename is absolute path, try the source path
1055 substitution on it. */
1056 char *rewritten_filename
= rewrite_source_path (filename
);
1058 if (rewritten_filename
!= NULL
)
1060 make_cleanup (xfree
, rewritten_filename
);
1061 filename
= rewritten_filename
;
1065 result
= openp (path
, OPF_SEARCH_IN_PATH
, filename
, OPEN_MODE
, fullname
);
1068 /* Didn't work. Try using just the basename. */
1069 p
= lbasename (filename
);
1071 result
= openp (path
, OPF_SEARCH_IN_PATH
, p
, OPEN_MODE
, fullname
);
1077 /* Open a source file given a symtab S. Returns a file descriptor or
1078 negative number for error.
1080 This function is a convience function to find_and_open_source. */
1083 open_source_file (struct symtab
*s
)
1088 return find_and_open_source (s
->filename
, s
->dirname
, &s
->fullname
);
1091 /* Finds the fullname that a symtab represents.
1093 If this functions finds the fullname, it will save it in s->fullname
1094 and it will also return the value.
1096 If this function fails to find the file that this symtab represents,
1097 NULL will be returned and s->fullname will be set to NULL. */
1099 symtab_to_fullname (struct symtab
*s
)
1106 /* Don't check s->fullname here, the file could have been
1107 deleted/moved/..., look for it again. */
1108 r
= find_and_open_source (s
->filename
, s
->dirname
, &s
->fullname
);
1119 /* Create and initialize the table S->line_charpos that records
1120 the positions of the lines in the source file, which is assumed
1121 to be open on descriptor DESC.
1122 All set S->nlines to the number of such lines. */
1125 find_source_lines (struct symtab
*s
, int desc
)
1128 char *data
, *p
, *end
;
1130 int lines_allocated
= 1000;
1136 line_charpos
= (int *) xmalloc (lines_allocated
* sizeof (int));
1137 if (fstat (desc
, &st
) < 0)
1138 perror_with_name (s
->filename
);
1140 if (s
->objfile
&& s
->objfile
->obfd
)
1141 mtime
= s
->objfile
->mtime
;
1143 mtime
= exec_bfd_mtime
;
1145 if (mtime
&& mtime
< st
.st_mtime
)
1146 warning (_("Source file is more recent than executable."));
1149 struct cleanup
*old_cleanups
;
1151 /* st_size might be a large type, but we only support source files whose
1152 size fits in an int. */
1153 size
= (int) st
.st_size
;
1155 /* Use malloc, not alloca, because this may be pretty large, and we may
1156 run into various kinds of limits on stack size. */
1157 data
= (char *) xmalloc (size
);
1158 old_cleanups
= make_cleanup (xfree
, data
);
1160 /* Reassign `size' to result of read for systems where \r\n -> \n. */
1161 size
= myread (desc
, data
, size
);
1163 perror_with_name (s
->filename
);
1166 line_charpos
[0] = 0;
1171 /* A newline at the end does not start a new line. */
1174 if (nlines
== lines_allocated
)
1176 lines_allocated
*= 2;
1178 (int *) xrealloc ((char *) line_charpos
,
1179 sizeof (int) * lines_allocated
);
1181 line_charpos
[nlines
++] = p
- data
;
1184 do_cleanups (old_cleanups
);
1189 (int *) xrealloc ((char *) line_charpos
, nlines
* sizeof (int));
1195 /* Get full pathname and line number positions for a symtab.
1196 Return nonzero if line numbers may have changed.
1197 Set *FULLNAME to actual name of the file as found by `openp',
1198 or to 0 if the file is not found. */
1201 get_filename_and_charpos (struct symtab
*s
, char **fullname
)
1203 int desc
, linenums_changed
= 0;
1204 struct cleanup
*cleanups
;
1206 desc
= open_source_file (s
);
1213 cleanups
= make_cleanup_close (desc
);
1215 *fullname
= s
->fullname
;
1216 if (s
->line_charpos
== 0)
1217 linenums_changed
= 1;
1218 if (linenums_changed
)
1219 find_source_lines (s
, desc
);
1220 do_cleanups (cleanups
);
1221 return linenums_changed
;
1224 /* Print text describing the full name of the source file S
1225 and the line number LINE and its corresponding character position.
1226 The text starts with two Ctrl-z so that the Emacs-GDB interface
1229 MID_STATEMENT is nonzero if the PC is not at the beginning of that line.
1231 Return 1 if successful, 0 if could not find the file. */
1234 identify_source_line (struct symtab
*s
, int line
, int mid_statement
,
1237 if (s
->line_charpos
== 0)
1238 get_filename_and_charpos (s
, (char **) NULL
);
1239 if (s
->fullname
== 0)
1241 if (line
> s
->nlines
)
1242 /* Don't index off the end of the line_charpos array. */
1244 annotate_source (s
->fullname
, line
, s
->line_charpos
[line
- 1],
1245 mid_statement
, get_objfile_arch (s
->objfile
), pc
);
1247 current_source_line
= line
;
1248 first_line_listed
= line
;
1249 last_line_listed
= line
;
1250 current_source_symtab
= s
;
1255 /* Print source lines from the file of symtab S,
1256 starting with line number LINE and stopping before line number STOPLINE. */
1258 static void print_source_lines_base (struct symtab
*s
, int line
, int stopline
,
1261 print_source_lines_base (struct symtab
*s
, int line
, int stopline
, int noerror
)
1267 int nlines
= stopline
- line
;
1268 struct cleanup
*cleanup
;
1270 /* Regardless of whether we can open the file, set current_source_symtab. */
1271 current_source_symtab
= s
;
1272 current_source_line
= line
;
1273 first_line_listed
= line
;
1275 /* If printing of source lines is disabled, just print file and line
1277 if (ui_out_test_flags (uiout
, ui_source_list
))
1279 /* Only prints "No such file or directory" once. */
1280 if ((s
!= last_source_visited
) || (!last_source_error
))
1282 last_source_visited
= s
;
1283 desc
= open_source_file (s
);
1287 desc
= last_source_error
;
1293 desc
= last_source_error
;
1298 if (desc
< 0 || noprint
)
1300 last_source_error
= desc
;
1304 char *name
= alloca (strlen (s
->filename
) + 100);
1305 sprintf (name
, "%d\t%s", line
, s
->filename
);
1306 print_sys_errmsg (name
, errno
);
1309 ui_out_field_int (uiout
, "line", line
);
1310 ui_out_text (uiout
, "\tin ");
1311 ui_out_field_string (uiout
, "file", s
->filename
);
1312 ui_out_text (uiout
, "\n");
1317 last_source_error
= 0;
1319 if (s
->line_charpos
== 0)
1320 find_source_lines (s
, desc
);
1322 if (line
< 1 || line
> s
->nlines
)
1325 error (_("Line number %d out of range; %s has %d lines."),
1326 line
, s
->filename
, s
->nlines
);
1329 if (lseek (desc
, s
->line_charpos
[line
- 1], 0) < 0)
1332 perror_with_name (s
->filename
);
1335 stream
= fdopen (desc
, FDOPEN_MODE
);
1337 cleanup
= make_cleanup_fclose (stream
);
1339 while (nlines
-- > 0)
1346 last_line_listed
= current_source_line
;
1347 sprintf (buf
, "%d\t", current_source_line
++);
1348 ui_out_text (uiout
, buf
);
1351 if (c
< 040 && c
!= '\t' && c
!= '\n' && c
!= '\r')
1353 sprintf (buf
, "^%c", c
+ 0100);
1354 ui_out_text (uiout
, buf
);
1357 ui_out_text (uiout
, "^?");
1360 /* Skip a \r character, but only before a \n. */
1361 int c1
= fgetc (stream
);
1364 printf_filtered ("^%c", c
+ 0100);
1366 ungetc (c1
, stream
);
1370 sprintf (buf
, "%c", c
);
1371 ui_out_text (uiout
, buf
);
1374 while (c
!= '\n' && (c
= fgetc (stream
)) >= 0);
1377 do_cleanups (cleanup
);
1380 /* Show source lines from the file of symtab S, starting with line
1381 number LINE and stopping before line number STOPLINE. If this is
1382 not the command line version, then the source is shown in the source
1383 window otherwise it is simply printed. */
1386 print_source_lines (struct symtab
*s
, int line
, int stopline
, int noerror
)
1388 print_source_lines_base (s
, line
, stopline
, noerror
);
1391 /* Print info on range of pc's in a specified line. */
1394 line_info (char *arg
, int from_tty
)
1396 struct symtabs_and_lines sals
;
1397 struct symtab_and_line sal
;
1398 CORE_ADDR start_pc
, end_pc
;
1401 init_sal (&sal
); /* initialize to zeroes */
1405 sal
.symtab
= current_source_symtab
;
1406 sal
.line
= last_line_listed
;
1408 sals
.sals
= (struct symtab_and_line
*)
1409 xmalloc (sizeof (struct symtab_and_line
));
1414 sals
= decode_line_spec_1 (arg
, 0);
1419 /* C++ More than one line may have been specified, as when the user
1420 specifies an overloaded function name. Print info on them all. */
1421 for (i
= 0; i
< sals
.nelts
; i
++)
1425 if (sal
.symtab
== 0)
1427 struct gdbarch
*gdbarch
= get_current_arch ();
1429 printf_filtered (_("No line number information available"));
1432 /* This is useful for "info line *0x7f34". If we can't tell the
1433 user about a source line, at least let them have the symbolic
1435 printf_filtered (" for address ");
1437 print_address (gdbarch
, sal
.pc
, gdb_stdout
);
1440 printf_filtered (".");
1441 printf_filtered ("\n");
1443 else if (sal
.line
> 0
1444 && find_line_pc_range (sal
, &start_pc
, &end_pc
))
1446 struct gdbarch
*gdbarch
= get_objfile_arch (sal
.symtab
->objfile
);
1448 if (start_pc
== end_pc
)
1450 printf_filtered ("Line %d of \"%s\"",
1451 sal
.line
, sal
.symtab
->filename
);
1453 printf_filtered (" is at address ");
1454 print_address (gdbarch
, start_pc
, gdb_stdout
);
1456 printf_filtered (" but contains no code.\n");
1460 printf_filtered ("Line %d of \"%s\"",
1461 sal
.line
, sal
.symtab
->filename
);
1463 printf_filtered (" starts at address ");
1464 print_address (gdbarch
, start_pc
, gdb_stdout
);
1466 printf_filtered (" and ends at ");
1467 print_address (gdbarch
, end_pc
, gdb_stdout
);
1468 printf_filtered (".\n");
1471 /* x/i should display this line's code. */
1472 set_next_address (gdbarch
, start_pc
);
1474 /* Repeating "info line" should do the following line. */
1475 last_line_listed
= sal
.line
+ 1;
1477 /* If this is the only line, show the source code. If it could
1478 not find the file, don't do anything special. */
1479 if (annotation_level
&& sals
.nelts
== 1)
1480 identify_source_line (sal
.symtab
, sal
.line
, 0, start_pc
);
1483 /* Is there any case in which we get here, and have an address
1484 which the user would want to see? If we have debugging symbols
1485 and no line numbers? */
1486 printf_filtered (_("Line number %d is out of range for \"%s\".\n"),
1487 sal
.line
, sal
.symtab
->filename
);
1492 /* Commands to search the source file for a regexp. */
1495 forward_search_command (char *regex
, int from_tty
)
1502 struct cleanup
*cleanups
;
1504 line
= last_line_listed
+ 1;
1506 msg
= (char *) re_comp (regex
);
1508 error (("%s"), msg
);
1510 if (current_source_symtab
== 0)
1511 select_source_symtab (0);
1513 desc
= open_source_file (current_source_symtab
);
1515 perror_with_name (current_source_symtab
->filename
);
1516 cleanups
= make_cleanup_close (desc
);
1518 if (current_source_symtab
->line_charpos
== 0)
1519 find_source_lines (current_source_symtab
, desc
);
1521 if (line
< 1 || line
> current_source_symtab
->nlines
)
1522 error (_("Expression not found"));
1524 if (lseek (desc
, current_source_symtab
->line_charpos
[line
- 1], 0) < 0)
1525 perror_with_name (current_source_symtab
->filename
);
1527 discard_cleanups (cleanups
);
1528 stream
= fdopen (desc
, FDOPEN_MODE
);
1530 cleanups
= make_cleanup_fclose (stream
);
1533 static char *buf
= NULL
;
1535 int cursize
, newsize
;
1538 buf
= xmalloc (cursize
);
1547 if (p
- buf
== cursize
)
1549 newsize
= cursize
+ cursize
/ 2;
1550 buf
= xrealloc (buf
, newsize
);
1555 while (c
!= '\n' && (c
= getc (stream
)) >= 0);
1557 /* Remove the \r, if any, at the end of the line, otherwise
1558 regular expressions that end with $ or \n won't work. */
1559 if (p
- buf
> 1 && p
[-2] == '\r')
1565 /* We now have a source line in buf, null terminate and match. */
1567 if (re_exec (buf
) > 0)
1570 do_cleanups (cleanups
);
1571 print_source_lines (current_source_symtab
, line
, line
+ 1, 0);
1572 set_internalvar_integer (lookup_internalvar ("_"), line
);
1573 current_source_line
= max (line
- lines_to_list
/ 2, 1);
1579 printf_filtered (_("Expression not found\n"));
1580 do_cleanups (cleanups
);
1584 reverse_search_command (char *regex
, int from_tty
)
1591 struct cleanup
*cleanups
;
1593 line
= last_line_listed
- 1;
1595 msg
= (char *) re_comp (regex
);
1597 error (("%s"), msg
);
1599 if (current_source_symtab
== 0)
1600 select_source_symtab (0);
1602 desc
= open_source_file (current_source_symtab
);
1604 perror_with_name (current_source_symtab
->filename
);
1605 cleanups
= make_cleanup_close (desc
);
1607 if (current_source_symtab
->line_charpos
== 0)
1608 find_source_lines (current_source_symtab
, desc
);
1610 if (line
< 1 || line
> current_source_symtab
->nlines
)
1611 error (_("Expression not found"));
1613 if (lseek (desc
, current_source_symtab
->line_charpos
[line
- 1], 0) < 0)
1614 perror_with_name (current_source_symtab
->filename
);
1616 discard_cleanups (cleanups
);
1617 stream
= fdopen (desc
, FDOPEN_MODE
);
1619 cleanups
= make_cleanup_fclose (stream
);
1622 /* FIXME!!! We walk right off the end of buf if we get a long line!!! */
1623 char buf
[4096]; /* Should be reasonable??? */
1633 while (c
!= '\n' && (c
= getc (stream
)) >= 0);
1635 /* Remove the \r, if any, at the end of the line, otherwise
1636 regular expressions that end with $ or \n won't work. */
1637 if (p
- buf
> 1 && p
[-2] == '\r')
1643 /* We now have a source line in buf; null terminate and match. */
1645 if (re_exec (buf
) > 0)
1648 do_cleanups (cleanups
);
1649 print_source_lines (current_source_symtab
, line
, line
+ 1, 0);
1650 set_internalvar_integer (lookup_internalvar ("_"), line
);
1651 current_source_line
= max (line
- lines_to_list
/ 2, 1);
1655 if (fseek (stream
, current_source_symtab
->line_charpos
[line
- 1], 0) < 0)
1657 do_cleanups (cleanups
);
1658 perror_with_name (current_source_symtab
->filename
);
1662 printf_filtered (_("Expression not found\n"));
1663 do_cleanups (cleanups
);
1667 /* If the last character of PATH is a directory separator, then strip it. */
1670 strip_trailing_directory_separator (char *path
)
1672 const int last
= strlen (path
) - 1;
1675 return; /* No stripping is needed if PATH is the empty string. */
1677 if (IS_DIR_SEPARATOR (path
[last
]))
1681 /* Return the path substitution rule that matches FROM.
1682 Return NULL if no rule matches. */
1684 static struct substitute_path_rule
*
1685 find_substitute_path_rule (const char *from
)
1687 struct substitute_path_rule
*rule
= substitute_path_rules
;
1689 while (rule
!= NULL
)
1691 if (FILENAME_CMP (rule
->from
, from
) == 0)
1699 /* Add a new substitute-path rule at the end of the current list of rules.
1700 The new rule will replace FROM into TO. */
1703 add_substitute_path_rule (char *from
, char *to
)
1705 struct substitute_path_rule
*rule
;
1706 struct substitute_path_rule
*new_rule
;
1708 new_rule
= xmalloc (sizeof (struct substitute_path_rule
));
1709 new_rule
->from
= xstrdup (from
);
1710 new_rule
->to
= xstrdup (to
);
1711 new_rule
->next
= NULL
;
1713 /* If the list of rules are empty, then insert the new rule
1714 at the head of the list. */
1716 if (substitute_path_rules
== NULL
)
1718 substitute_path_rules
= new_rule
;
1722 /* Otherwise, skip to the last rule in our list and then append
1725 rule
= substitute_path_rules
;
1726 while (rule
->next
!= NULL
)
1729 rule
->next
= new_rule
;
1732 /* Remove the given source path substitution rule from the current list
1733 of rules. The memory allocated for that rule is also deallocated. */
1736 delete_substitute_path_rule (struct substitute_path_rule
*rule
)
1738 if (rule
== substitute_path_rules
)
1739 substitute_path_rules
= rule
->next
;
1742 struct substitute_path_rule
*prev
= substitute_path_rules
;
1744 while (prev
!= NULL
&& prev
->next
!= rule
)
1747 gdb_assert (prev
!= NULL
);
1749 prev
->next
= rule
->next
;
1757 /* Implement the "show substitute-path" command. */
1760 show_substitute_path_command (char *args
, int from_tty
)
1762 struct substitute_path_rule
*rule
= substitute_path_rules
;
1766 argv
= gdb_buildargv (args
);
1767 make_cleanup_freeargv (argv
);
1769 /* We expect zero or one argument. */
1771 if (argv
!= NULL
&& argv
[0] != NULL
&& argv
[1] != NULL
)
1772 error (_("Too many arguments in command"));
1774 if (argv
!= NULL
&& argv
[0] != NULL
)
1777 /* Print the substitution rules. */
1781 (_("Source path substitution rule matching `%s':\n"), from
);
1783 printf_filtered (_("List of all source path substitution rules:\n"));
1785 while (rule
!= NULL
)
1787 if (from
== NULL
|| FILENAME_CMP (rule
->from
, from
) == 0)
1788 printf_filtered (" `%s' -> `%s'.\n", rule
->from
, rule
->to
);
1793 /* Implement the "unset substitute-path" command. */
1796 unset_substitute_path_command (char *args
, int from_tty
)
1798 struct substitute_path_rule
*rule
= substitute_path_rules
;
1799 char **argv
= gdb_buildargv (args
);
1803 /* This function takes either 0 or 1 argument. */
1805 make_cleanup_freeargv (argv
);
1806 if (argv
!= NULL
&& argv
[0] != NULL
&& argv
[1] != NULL
)
1807 error (_("Incorrect usage, too many arguments in command"));
1809 if (argv
!= NULL
&& argv
[0] != NULL
)
1812 /* If the user asked for all the rules to be deleted, ask him
1813 to confirm and give him a chance to abort before the action
1817 && !query (_("Delete all source path substitution rules? ")))
1818 error (_("Canceled"));
1820 /* Delete the rule matching the argument. No argument means that
1821 all rules should be deleted. */
1823 while (rule
!= NULL
)
1825 struct substitute_path_rule
*next
= rule
->next
;
1827 if (from
== NULL
|| FILENAME_CMP (from
, rule
->from
) == 0)
1829 delete_substitute_path_rule (rule
);
1836 /* If the user asked for a specific rule to be deleted but
1837 we could not find it, then report an error. */
1839 if (from
!= NULL
&& !rule_found
)
1840 error (_("No substitution rule defined for `%s'"), from
);
1842 forget_cached_source_info ();
1845 /* Add a new source path substitution rule. */
1848 set_substitute_path_command (char *args
, int from_tty
)
1851 struct substitute_path_rule
*rule
;
1853 argv
= gdb_buildargv (args
);
1854 make_cleanup_freeargv (argv
);
1856 if (argv
== NULL
|| argv
[0] == NULL
|| argv
[1] == NULL
)
1857 error (_("Incorrect usage, too few arguments in command"));
1859 if (argv
[2] != NULL
)
1860 error (_("Incorrect usage, too many arguments in command"));
1862 if (*(argv
[0]) == '\0')
1863 error (_("First argument must be at least one character long"));
1865 /* Strip any trailing directory separator character in either FROM
1866 or TO. The substitution rule already implicitly contains them. */
1867 strip_trailing_directory_separator (argv
[0]);
1868 strip_trailing_directory_separator (argv
[1]);
1870 /* If a rule with the same "from" was previously defined, then
1871 delete it. This new rule replaces it. */
1873 rule
= find_substitute_path_rule (argv
[0]);
1875 delete_substitute_path_rule (rule
);
1877 /* Insert the new substitution rule. */
1879 add_substitute_path_rule (argv
[0], argv
[1]);
1880 forget_cached_source_info ();
1885 _initialize_source (void)
1887 struct cmd_list_element
*c
;
1889 current_source_symtab
= 0;
1890 init_source_path ();
1892 /* The intention is to use POSIX Basic Regular Expressions.
1893 Always use the GNU regex routine for consistency across all hosts.
1894 Our current GNU regex.c does not have all the POSIX features, so this is
1895 just an approximation. */
1896 re_set_syntax (RE_SYNTAX_GREP
);
1898 c
= add_cmd ("directory", class_files
, directory_command
, _("\
1899 Add directory DIR to beginning of search path for source files.\n\
1900 Forget cached info on source file locations and line positions.\n\
1901 DIR can also be $cwd for the current working directory, or $cdir for the\n\
1902 directory in which the source file was compiled into object code.\n\
1903 With no argument, reset the search path to $cdir:$cwd, the default."),
1907 add_com_alias ("use", "directory", class_files
, 0);
1909 set_cmd_completer (c
, filename_completer
);
1911 add_setshow_optional_filename_cmd ("directories",
1915 Set the search path for finding source files."),
1917 Show the search path for finding source files."),
1919 $cwd in the path means the current working directory.\n\
1920 $cdir in the path means the compilation directory of the source file.\n\
1921 GDB ensures the search path always ends with $cdir:$cwd by\n\
1922 appending these directories if necessary.\n\
1923 Setting the value to an empty string sets it to $cdir:$cwd, the default."),
1924 set_directories_command
,
1925 show_directories_command
,
1926 &setlist
, &showlist
);
1930 add_com_alias ("D", "directory", class_files
, 0);
1931 add_cmd ("ld", no_class
, show_directories_1
, _("\
1932 Current search path for finding source files.\n\
1933 $cwd in the path means the current working directory.\n\
1934 $cdir in the path means the compilation directory of the source file."),
1938 add_info ("source", source_info
,
1939 _("Information about the current source file."));
1941 add_info ("line", line_info
, _("\
1942 Core addresses of the code for a source line.\n\
1943 Line can be specified as\n\
1944 LINENUM, to list around that line in current file,\n\
1945 FILE:LINENUM, to list around that line in that file,\n\
1946 FUNCTION, to list around beginning of that function,\n\
1947 FILE:FUNCTION, to distinguish among like-named static functions.\n\
1948 Default is to describe the last source line that was listed.\n\n\
1949 This sets the default address for \"x\" to the line's first instruction\n\
1950 so that \"x/i\" suffices to start examining the machine code.\n\
1951 The address is also stored as the value of \"$_\"."));
1953 add_com ("forward-search", class_files
, forward_search_command
, _("\
1954 Search for regular expression (see regex(3)) from last line listed.\n\
1955 The matching line number is also stored as the value of \"$_\"."));
1956 add_com_alias ("search", "forward-search", class_files
, 0);
1958 add_com ("reverse-search", class_files
, reverse_search_command
, _("\
1959 Search backward for regular expression (see regex(3)) from last line listed.\n\
1960 The matching line number is also stored as the value of \"$_\"."));
1961 add_com_alias ("rev", "reverse-search", class_files
, 1);
1965 add_com_alias ("/", "forward-search", class_files
, 0);
1966 add_com_alias ("?", "reverse-search", class_files
, 0);
1969 add_setshow_integer_cmd ("listsize", class_support
, &lines_to_list
, _("\
1970 Set number of source lines gdb will list by default."), _("\
1971 Show number of source lines gdb will list by default."), NULL
,
1974 &setlist
, &showlist
);
1976 add_cmd ("substitute-path", class_files
, set_substitute_path_command
,
1978 Usage: set substitute-path FROM TO\n\
1979 Add a substitution rule replacing FROM into TO in source file names.\n\
1980 If a substitution rule was previously set for FROM, the old rule\n\
1981 is replaced by the new one."),
1984 add_cmd ("substitute-path", class_files
, unset_substitute_path_command
,
1986 Usage: unset substitute-path [FROM]\n\
1987 Delete the rule for substituting FROM in source file names. If FROM\n\
1988 is not specified, all substituting rules are deleted.\n\
1989 If the debugger cannot find a rule for FROM, it will display a warning."),
1992 add_cmd ("substitute-path", class_files
, show_substitute_path_command
,
1994 Usage: show substitute-path [FROM]\n\
1995 Print the rule for substituting FROM in source file names. If FROM\n\
1996 is not specified, print all substitution rules."),