1 /* List lines of source files for GDB, the GNU debugger.
2 Copyright (C) 1986-2005, 2007-2012 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "arch-utils.h"
22 #include "expression.h"
29 #include "gdb_assert.h"
31 #include <sys/types.h>
32 #include "gdb_string.h"
36 #include "gdb_regex.h"
42 #include "filenames.h" /* for DOSish file names */
43 #include "completer.h"
45 #include "readline/readline.h"
50 #define OPEN_MODE (O_RDONLY | O_BINARY)
51 #define FDOPEN_MODE FOPEN_RB
53 /* Prototypes for exported functions. */
55 void _initialize_source (void);
57 /* Prototypes for local functions. */
59 static int get_filename_and_charpos (struct symtab
*, char **);
61 static void reverse_search_command (char *, int);
63 static void forward_search_command (char *, int);
65 static void line_info (char *, int);
67 static void source_info (char *, int);
69 /* Path of directories to search for source files.
70 Same format as the PATH environment variable's value. */
74 /* Support for source path substitution commands. */
76 struct substitute_path_rule
80 struct substitute_path_rule
*next
;
83 static struct substitute_path_rule
*substitute_path_rules
= NULL
;
85 /* Symtab of default file for listing lines of. */
87 static struct symtab
*current_source_symtab
;
89 /* Default next line to list. */
91 static int current_source_line
;
93 static struct program_space
*current_source_pspace
;
95 /* Default number of lines to print with commands like "list".
96 This is based on guessing how many long (i.e. more than chars_per_line
97 characters) lines there will be. To be completely correct, "list"
98 and friends should be rewritten to count characters and see where
99 things are wrapping, but that would be a fair amount of work. */
101 int lines_to_list
= 10;
103 show_lines_to_list (struct ui_file
*file
, int from_tty
,
104 struct cmd_list_element
*c
, const char *value
)
106 fprintf_filtered (file
,
107 _("Number of source lines gdb "
108 "will list by default is %s.\n"),
112 /* Line number of last line printed. Default for various commands.
113 current_source_line is usually, but not always, the same as this. */
115 static int last_line_listed
;
117 /* First line number listed by last listing command. */
119 static int first_line_listed
;
121 /* Saves the name of the last source file visited and a possible error code.
122 Used to prevent repeating annoying "No such file or directories" msgs. */
124 static struct symtab
*last_source_visited
= NULL
;
125 static int last_source_error
= 0;
127 /* Return the first line listed by print_source_lines.
128 Used by command interpreters to request listing from
132 get_first_line_listed (void)
134 return first_line_listed
;
137 /* Return the default number of lines to print with commands like the
138 cli "list". The caller of print_source_lines must use this to
139 calculate the end line and use it in the call to print_source_lines
140 as it does not automatically use this value. */
143 get_lines_to_list (void)
145 return lines_to_list
;
148 /* Return the current source file for listing and next line to list.
149 NOTE: The returned sal pc and end fields are not valid. */
151 struct symtab_and_line
152 get_current_source_symtab_and_line (void)
154 struct symtab_and_line cursal
= { 0 };
156 cursal
.pspace
= current_source_pspace
;
157 cursal
.symtab
= current_source_symtab
;
158 cursal
.line
= current_source_line
;
165 /* If the current source file for listing is not set, try and get a default.
166 Usually called before get_current_source_symtab_and_line() is called.
167 It may err out if a default cannot be determined.
168 We must be cautious about where it is called, as it can recurse as the
169 process of determining a new default may call the caller!
170 Use get_current_source_symtab_and_line only to get whatever
171 we have without erroring out or trying to get a default. */
174 set_default_source_symtab_and_line (void)
176 if (!have_full_symbols () && !have_partial_symbols ())
177 error (_("No symbol table is loaded. Use the \"file\" command."));
179 /* Pull in a current source symtab if necessary. */
180 if (current_source_symtab
== 0)
181 select_source_symtab (0);
184 /* Return the current default file for listing and next line to list
185 (the returned sal pc and end fields are not valid.)
186 and set the current default to whatever is in SAL.
187 NOTE: The returned sal pc and end fields are not valid. */
189 struct symtab_and_line
190 set_current_source_symtab_and_line (const struct symtab_and_line
*sal
)
192 struct symtab_and_line cursal
= { 0 };
194 cursal
.pspace
= current_source_pspace
;
195 cursal
.symtab
= current_source_symtab
;
196 cursal
.line
= current_source_line
;
200 current_source_pspace
= sal
->pspace
;
201 current_source_symtab
= sal
->symtab
;
202 current_source_line
= sal
->line
;
207 /* Reset any information stored about a default file and line to print. */
210 clear_current_source_symtab_and_line (void)
212 current_source_symtab
= 0;
213 current_source_line
= 0;
216 /* Set the source file default for the "list" command to be S.
218 If S is NULL, and we don't have a default, find one. This
219 should only be called when the user actually tries to use the
220 default, since we produce an error if we can't find a reasonable
221 default. Also, since this can cause symbols to be read, doing it
222 before we need to would make things slower than necessary. */
225 select_source_symtab (struct symtab
*s
)
227 struct symtabs_and_lines sals
;
228 struct symtab_and_line sal
;
233 current_source_symtab
= s
;
234 current_source_line
= 1;
235 current_source_pspace
= SYMTAB_PSPACE (s
);
239 if (current_source_symtab
)
242 /* Make the default place to list be the function `main'
244 if (lookup_symbol (main_name (), 0, VAR_DOMAIN
, 0))
246 sals
= decode_line_with_current_source (main_name (),
247 DECODE_LINE_FUNFIRSTLINE
);
250 current_source_pspace
= sal
.pspace
;
251 current_source_symtab
= sal
.symtab
;
252 current_source_line
= max (sal
.line
- (lines_to_list
- 1), 1);
253 if (current_source_symtab
)
257 /* Alright; find the last file in the symtab list (ignoring .h's
258 and namespace symtabs). */
260 current_source_line
= 1;
264 for (s
= ofp
->symtabs
; s
; s
= s
->next
)
266 const char *name
= s
->filename
;
267 int len
= strlen (name
);
269 if (!(len
> 2 && (strcmp (&name
[len
- 2], ".h") == 0
270 || strcmp (name
, "<<C++-namespaces>>") == 0)))
272 current_source_pspace
= current_program_space
;
273 current_source_symtab
= s
;
278 if (current_source_symtab
)
284 s
= ofp
->sf
->qf
->find_last_source_symtab (ofp
);
286 current_source_symtab
= s
;
288 if (current_source_symtab
)
291 error (_("Can't find a default source file"));
294 /* Handler for "set directories path-list" command.
295 "set dir mumble" doesn't prepend paths, it resets the entire
296 path list. The theory is that set(show(dir)) should be a no-op. */
299 set_directories_command (char *args
, int from_tty
, struct cmd_list_element
*c
)
301 /* This is the value that was set.
302 It needs to be processed to maintain $cdir:$cwd and remove dups. */
303 char *set_path
= source_path
;
305 /* We preserve the invariant that $cdir:$cwd begins life at the end of
306 the list by calling init_source_path. If they appear earlier in
307 SET_PATH then mod_path will move them appropriately.
308 mod_path will also remove duplicates. */
310 if (*set_path
!= '\0')
311 mod_path (set_path
, &source_path
);
316 /* Print the list of source directories.
317 This is used by the "ld" command, so it has the signature of a command
321 show_directories_1 (char *ignore
, int from_tty
)
323 puts_filtered ("Source directories searched: ");
324 puts_filtered (source_path
);
325 puts_filtered ("\n");
328 /* Handler for "show directories" command. */
331 show_directories_command (struct ui_file
*file
, int from_tty
,
332 struct cmd_list_element
*c
, const char *value
)
334 show_directories_1 (NULL
, from_tty
);
337 /* Forget line positions and file names for the symtabs in a
338 particular objfile. */
341 forget_cached_source_info_for_objfile (struct objfile
*objfile
)
345 ALL_OBJFILE_SYMTABS (objfile
, s
)
347 if (s
->line_charpos
!= NULL
)
349 xfree (s
->line_charpos
);
350 s
->line_charpos
= NULL
;
352 if (s
->fullname
!= NULL
)
360 objfile
->sf
->qf
->forget_cached_source_info (objfile
);
363 /* Forget what we learned about line positions in source files, and
364 which directories contain them; must check again now since files
365 may be found in a different directory now. */
368 forget_cached_source_info (void)
370 struct program_space
*pspace
;
371 struct objfile
*objfile
;
374 ALL_PSPACE_OBJFILES (pspace
, objfile
)
376 forget_cached_source_info_for_objfile (objfile
);
379 last_source_visited
= NULL
;
383 init_source_path (void)
387 sprintf (buf
, "$cdir%c$cwd", DIRNAME_SEPARATOR
);
388 source_path
= xstrdup (buf
);
389 forget_cached_source_info ();
392 /* Add zero or more directories to the front of the source path. */
395 directory_command (char *dirname
, int from_tty
)
398 /* FIXME, this goes to "delete dir"... */
401 if (!from_tty
|| query (_("Reinitialize source path to empty? ")))
409 mod_path (dirname
, &source_path
);
410 forget_cached_source_info ();
413 show_directories_1 ((char *) 0, from_tty
);
416 /* Add a path given with the -d command line switch.
417 This will not be quoted so we must not treat spaces as separators. */
420 directory_switch (char *dirname
, int from_tty
)
422 add_path (dirname
, &source_path
, 0);
425 /* Add zero or more directories to the front of an arbitrary path. */
428 mod_path (char *dirname
, char **which_path
)
430 add_path (dirname
, which_path
, 1);
433 /* Workhorse of mod_path. Takes an extra argument to determine
434 if dirname should be parsed for separators that indicate multiple
435 directories. This allows for interfaces that pre-parse the dirname
436 and allow specification of traditional separator characters such
440 add_path (char *dirname
, char **which_path
, int parse_separators
)
442 char *old
= *which_path
;
444 VEC (char_ptr
) *dir_vec
= NULL
;
445 struct cleanup
*back_to
;
452 if (parse_separators
)
454 char **argv
, **argvp
;
456 /* This will properly parse the space and tab separators
457 and any quotes that may exist. */
458 argv
= gdb_buildargv (dirname
);
460 for (argvp
= argv
; *argvp
; argvp
++)
461 dirnames_to_char_ptr_vec_append (&dir_vec
, *argvp
);
466 VEC_safe_push (char_ptr
, dir_vec
, xstrdup (dirname
));
467 back_to
= make_cleanup_free_char_ptr_vec (dir_vec
);
469 for (ix
= 0; VEC_iterate (char_ptr
, dir_vec
, ix
, name
); ++ix
)
474 /* Spaces and tabs will have been removed by buildargv().
475 NAME is the start of the directory.
476 P is the '\0' following the end. */
477 p
= name
+ strlen (name
);
479 while (!(IS_DIR_SEPARATOR (*name
) && p
<= name
+ 1) /* "/" */
480 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
481 /* On MS-DOS and MS-Windows, h:\ is different from h: */
482 && !(p
== name
+ 3 && name
[1] == ':') /* "d:/" */
484 && IS_DIR_SEPARATOR (p
[-1]))
485 /* Sigh. "foo/" => "foo" */
489 while (p
> name
&& p
[-1] == '.')
493 /* "." => getwd (). */
494 name
= current_directory
;
497 else if (p
> name
+ 1 && IS_DIR_SEPARATOR (p
[-2]))
507 /* "...foo/." => "...foo". */
518 name
= tilde_expand (name
);
519 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
520 else if (IS_ABSOLUTE_PATH (name
) && p
== name
+ 2) /* "d:" => "d:." */
521 name
= concat (name
, ".", (char *)NULL
);
523 else if (!IS_ABSOLUTE_PATH (name
) && name
[0] != '$')
524 name
= concat (current_directory
, SLASH_STRING
, name
, (char *)NULL
);
526 name
= savestring (name
, p
- name
);
527 make_cleanup (xfree
, name
);
529 /* Unless it's a variable, check existence. */
532 /* These are warnings, not errors, since we don't want a
533 non-existent directory in a .gdbinit file to stop processing
534 of the .gdbinit file.
536 Whether they get added to the path is more debatable. Current
537 answer is yes, in case the user wants to go make the directory
538 or whatever. If the directory continues to not exist/not be
539 a directory/etc, then having them in the path should be
541 if (stat (name
, &st
) < 0)
543 int save_errno
= errno
;
545 fprintf_unfiltered (gdb_stderr
, "Warning: ");
546 print_sys_errmsg (name
, save_errno
);
548 else if ((st
.st_mode
& S_IFMT
) != S_IFDIR
)
549 warning (_("%s is not a directory."), name
);
554 unsigned int len
= strlen (name
);
558 /* FIXME: we should use realpath() or its work-alike
559 before comparing. Then all the code above which
560 removes excess slashes and dots could simply go away. */
561 if (!filename_cmp (p
, name
))
563 /* Found it in the search path, remove old copy. */
565 p
--; /* Back over leading separator. */
566 if (prefix
> p
- *which_path
)
567 goto skip_dup
; /* Same dir twice in one cmd. */
568 memmove (p
, &p
[len
+ 1], strlen (&p
[len
+ 1]) + 1); /* Copy from next \0 or : */
571 tinybuf
[0] = DIRNAME_SEPARATOR
;
574 /* If we have already tacked on a name(s) in this command,
575 be sure they stay on the front as we tack on some
583 temp
= concat (old
, tinybuf
, name
, (char *)NULL
);
585 *which_path
= concat (temp
, "", &old
[prefix
], (char *) NULL
);
586 prefix
= strlen (temp
);
591 *which_path
= concat (name
, (old
[0] ? tinybuf
: old
),
593 prefix
= strlen (name
);
602 do_cleanups (back_to
);
607 source_info (char *ignore
, int from_tty
)
609 struct symtab
*s
= current_source_symtab
;
613 printf_filtered (_("No current source file.\n"));
616 printf_filtered (_("Current source file is %s\n"), s
->filename
);
618 printf_filtered (_("Compilation directory is %s\n"), s
->dirname
);
620 printf_filtered (_("Located in %s\n"), s
->fullname
);
622 printf_filtered (_("Contains %d line%s.\n"), s
->nlines
,
623 s
->nlines
== 1 ? "" : "s");
625 printf_filtered (_("Source language is %s.\n"), language_str (s
->language
));
626 printf_filtered (_("Compiled with %s debugging format.\n"), s
->debugformat
);
627 printf_filtered (_("%s preprocessor macro info.\n"),
628 s
->macro_table
? "Includes" : "Does not include");
632 /* Return True if the file NAME exists and is a regular file. */
634 is_regular_file (const char *name
)
637 const int status
= stat (name
, &st
);
639 /* Stat should never fail except when the file does not exist.
640 If stat fails, analyze the source of error and return True
641 unless the file does not exist, to avoid returning false results
642 on obscure systems where stat does not work as expected. */
645 return (errno
!= ENOENT
);
647 return S_ISREG (st
.st_mode
);
650 /* Open a file named STRING, searching path PATH (dir names sep by some char)
651 using mode MODE in the calls to open. You cannot use this function to
652 create files (O_CREAT).
654 OPTS specifies the function behaviour in specific cases.
656 If OPF_TRY_CWD_FIRST, try to open ./STRING before searching PATH.
657 (ie pretend the first element of PATH is "."). This also indicates
658 that a slash in STRING disables searching of the path (this is
659 so that "exec-file ./foo" or "symbol-file ./foo" insures that you
660 get that particular version of foo or an error message).
662 If OPTS has OPF_SEARCH_IN_PATH set, absolute names will also be
663 searched in path (we usually want this for source files but not for
666 If FILENAME_OPENED is non-null, set it to a newly allocated string naming
667 the actual file opened (this string will always start with a "/"). We
668 have to take special pains to avoid doubling the "/" between the directory
669 and the file, sigh! Emacs gets confuzzed by this when we print the
672 If a file is found, return the descriptor.
673 Otherwise, return -1, with errno set for the last name we tried to open. */
675 /* >>>> This should only allow files of certain types,
676 >>>> eg executable, non-directory. */
678 openp (const char *path
, int opts
, const char *string
,
679 int mode
, char **filename_opened
)
684 VEC (char_ptr
) *dir_vec
;
685 struct cleanup
*back_to
;
689 /* The open syscall MODE parameter is not specified. */
690 gdb_assert ((mode
& O_CREAT
) == 0);
691 gdb_assert (string
!= NULL
);
693 /* A file with an empty name cannot possibly exist. Report a failure
694 without further checking.
696 This is an optimization which also defends us against buggy
697 implementations of the "stat" function. For instance, we have
698 noticed that a MinGW debugger built on Windows XP 32bits crashes
699 when the debugger is started with an empty argument. */
700 if (string
[0] == '\0')
711 if ((opts
& OPF_TRY_CWD_FIRST
) || IS_ABSOLUTE_PATH (string
))
715 if (is_regular_file (string
))
717 filename
= alloca (strlen (string
) + 1);
718 strcpy (filename
, string
);
719 fd
= open (filename
, mode
);
729 if (!(opts
& OPF_SEARCH_IN_PATH
))
730 for (i
= 0; string
[i
]; i
++)
731 if (IS_DIR_SEPARATOR (string
[i
]))
735 /* For dos paths, d:/foo -> /foo, and d:foo -> foo. */
736 if (HAS_DRIVE_SPEC (string
))
737 string
= STRIP_DRIVE_SPEC (string
);
739 /* /foo => foo, to avoid multiple slashes that Emacs doesn't like. */
740 while (IS_DIR_SEPARATOR(string
[0]))
744 while (string
[0] == '.' && IS_DIR_SEPARATOR (string
[1]))
747 alloclen
= strlen (path
) + strlen (string
) + 2;
748 filename
= alloca (alloclen
);
751 dir_vec
= dirnames_to_char_ptr_vec (path
);
752 back_to
= make_cleanup_free_char_ptr_vec (dir_vec
);
754 for (ix
= 0; VEC_iterate (char_ptr
, dir_vec
, ix
, dir
); ++ix
)
756 size_t len
= strlen (dir
);
758 if (strcmp (dir
, "$cwd") == 0)
760 /* Name is $cwd -- insert current directory name instead. */
763 /* First, realloc the filename buffer if too short. */
764 len
= strlen (current_directory
);
765 newlen
= len
+ strlen (string
) + 2;
766 if (newlen
> alloclen
)
769 filename
= alloca (alloclen
);
771 strcpy (filename
, current_directory
);
773 else if (strchr(dir
, '~'))
775 /* See whether we need to expand the tilde. */
777 char *tilde_expanded
;
779 tilde_expanded
= tilde_expand (dir
);
781 /* First, realloc the filename buffer if too short. */
782 len
= strlen (tilde_expanded
);
783 newlen
= len
+ strlen (string
) + 2;
784 if (newlen
> alloclen
)
787 filename
= alloca (alloclen
);
789 strcpy (filename
, tilde_expanded
);
790 xfree (tilde_expanded
);
794 /* Normal file name in path -- just use it. */
795 strcpy (filename
, dir
);
797 /* Don't search $cdir. It's also a magic path like $cwd, but we
798 don't have enough information to expand it. The user *could*
799 have an actual directory named '$cdir' but handling that would
800 be confusing, it would mean different things in different
801 contexts. If the user really has '$cdir' one can use './$cdir'.
802 We can get $cdir when loading scripts. When loading source files
803 $cdir must have already been expanded to the correct value. */
804 if (strcmp (dir
, "$cdir") == 0)
808 /* Remove trailing slashes. */
809 while (len
> 0 && IS_DIR_SEPARATOR (filename
[len
- 1]))
812 strcat (filename
+ len
, SLASH_STRING
);
813 strcat (filename
, string
);
815 if (is_regular_file (filename
))
817 fd
= open (filename
, mode
);
823 do_cleanups (back_to
);
828 /* If a file was opened, canonicalize its filename. Use xfullpath
829 rather than gdb_realpath to avoid resolving the basename part
830 of filenames when the associated file is a symbolic link. This
831 fixes a potential inconsistency between the filenames known to
832 GDB and the filenames it prints in the annotations. */
834 *filename_opened
= NULL
;
835 else if (IS_ABSOLUTE_PATH (filename
))
836 *filename_opened
= xfullpath (filename
);
839 /* Beware the // my son, the Emacs barfs, the botch that catch... */
841 char *f
= concat (current_directory
,
842 IS_DIR_SEPARATOR (current_directory
[strlen (current_directory
) - 1])
844 filename
, (char *)NULL
);
846 *filename_opened
= xfullpath (f
);
855 /* This is essentially a convenience, for clients that want the behaviour
856 of openp, using source_path, but that really don't want the file to be
857 opened but want instead just to know what the full pathname is (as
858 qualified against source_path).
860 The current working directory is searched first.
862 If the file was found, this function returns 1, and FULL_PATHNAME is
863 set to the fully-qualified pathname.
865 Else, this functions returns 0, and FULL_PATHNAME is set to NULL. */
867 source_full_path_of (const char *filename
, char **full_pathname
)
871 fd
= openp (source_path
, OPF_TRY_CWD_FIRST
| OPF_SEARCH_IN_PATH
, filename
,
872 O_RDONLY
, full_pathname
);
875 *full_pathname
= NULL
;
883 /* Return non-zero if RULE matches PATH, that is if the rule can be
887 substitute_path_rule_matches (const struct substitute_path_rule
*rule
,
890 const int from_len
= strlen (rule
->from
);
891 const int path_len
= strlen (path
);
894 if (path_len
< from_len
)
897 /* The substitution rules are anchored at the start of the path,
898 so the path should start with rule->from. There is no filename
899 comparison routine, so we need to extract the first FROM_LEN
900 characters from PATH first and use that to do the comparison. */
902 path_start
= alloca (from_len
+ 1);
903 strncpy (path_start
, path
, from_len
);
904 path_start
[from_len
] = '\0';
906 if (FILENAME_CMP (path_start
, rule
->from
) != 0)
909 /* Make sure that the region in the path that matches the substitution
910 rule is immediately followed by a directory separator (or the end of
911 string character). */
913 if (path
[from_len
] != '\0' && !IS_DIR_SEPARATOR (path
[from_len
]))
919 /* Find the substitute-path rule that applies to PATH and return it.
920 Return NULL if no rule applies. */
922 static struct substitute_path_rule
*
923 get_substitute_path_rule (const char *path
)
925 struct substitute_path_rule
*rule
= substitute_path_rules
;
927 while (rule
!= NULL
&& !substitute_path_rule_matches (rule
, path
))
933 /* If the user specified a source path substitution rule that applies
934 to PATH, then apply it and return the new path. This new path must
935 be deallocated afterwards.
937 Return NULL if no substitution rule was specified by the user,
938 or if no rule applied to the given PATH. */
941 rewrite_source_path (const char *path
)
943 const struct substitute_path_rule
*rule
= get_substitute_path_rule (path
);
950 from_len
= strlen (rule
->from
);
952 /* Compute the rewritten path and return it. */
955 (char *) xmalloc (strlen (path
) + 1 + strlen (rule
->to
) - from_len
);
956 strcpy (new_path
, rule
->to
);
957 strcat (new_path
, path
+ from_len
);
963 find_and_open_source (const char *filename
,
967 char *path
= source_path
;
971 /* Quick way out if we already know its full name. */
975 /* The user may have requested that source paths be rewritten
976 according to substitution rules he provided. If a substitution
977 rule applies to this path, then apply it. */
978 char *rewritten_fullname
= rewrite_source_path (*fullname
);
980 if (rewritten_fullname
!= NULL
)
983 *fullname
= rewritten_fullname
;
986 result
= open (*fullname
, OPEN_MODE
);
989 /* Call xfullpath here to be consistent with openp
990 which we use below. */
991 char *lpath
= xfullpath (*fullname
);
998 /* Didn't work -- free old one, try again. */
1003 if (dirname
!= NULL
)
1005 /* If necessary, rewrite the compilation directory name according
1006 to the source path substitution rules specified by the user. */
1008 char *rewritten_dirname
= rewrite_source_path (dirname
);
1010 if (rewritten_dirname
!= NULL
)
1012 make_cleanup (xfree
, rewritten_dirname
);
1013 dirname
= rewritten_dirname
;
1016 /* Replace a path entry of $cdir with the compilation directory
1019 /* We cast strstr's result in case an ANSIhole has made it const,
1020 which produces a "required warning" when assigned to a nonconst. */
1021 p
= (char *) strstr (source_path
, "$cdir");
1022 if (p
&& (p
== path
|| p
[-1] == DIRNAME_SEPARATOR
)
1023 && (p
[cdir_len
] == DIRNAME_SEPARATOR
|| p
[cdir_len
] == '\0'))
1028 alloca (strlen (source_path
) + 1 + strlen (dirname
) + 1);
1029 len
= p
- source_path
;
1030 strncpy (path
, source_path
, len
); /* Before $cdir */
1031 strcpy (path
+ len
, dirname
); /* new stuff */
1032 strcat (path
+ len
, source_path
+ len
+ cdir_len
); /* After
1037 if (IS_ABSOLUTE_PATH (filename
))
1039 /* If filename is absolute path, try the source path
1040 substitution on it. */
1041 char *rewritten_filename
= rewrite_source_path (filename
);
1043 if (rewritten_filename
!= NULL
)
1045 make_cleanup (xfree
, rewritten_filename
);
1046 filename
= rewritten_filename
;
1050 result
= openp (path
, OPF_SEARCH_IN_PATH
, filename
, OPEN_MODE
, fullname
);
1053 /* Didn't work. Try using just the basename. */
1054 p
= lbasename (filename
);
1056 result
= openp (path
, OPF_SEARCH_IN_PATH
, p
, OPEN_MODE
, fullname
);
1062 /* Open a source file given a symtab S. Returns a file descriptor or
1063 negative number for error.
1065 This function is a convience function to find_and_open_source. */
1068 open_source_file (struct symtab
*s
)
1073 return find_and_open_source (s
->filename
, s
->dirname
, &s
->fullname
);
1076 /* Finds the fullname that a symtab represents.
1078 If this functions finds the fullname, it will save it in s->fullname
1079 and it will also return the value.
1081 If this function fails to find the file that this symtab represents,
1082 NULL will be returned and s->fullname will be set to NULL. */
1085 symtab_to_fullname (struct symtab
*s
)
1092 /* Use cached copy if we have it.
1093 We rely on forget_cached_source_info being called appropriately
1094 to handle cases like the file being moved. */
1098 r
= find_and_open_source (s
->filename
, s
->dirname
, &s
->fullname
);
1109 /* Create and initialize the table S->line_charpos that records
1110 the positions of the lines in the source file, which is assumed
1111 to be open on descriptor DESC.
1112 All set S->nlines to the number of such lines. */
1115 find_source_lines (struct symtab
*s
, int desc
)
1118 char *data
, *p
, *end
;
1120 int lines_allocated
= 1000;
1126 line_charpos
= (int *) xmalloc (lines_allocated
* sizeof (int));
1127 if (fstat (desc
, &st
) < 0)
1128 perror_with_name (s
->filename
);
1130 if (s
->objfile
&& s
->objfile
->obfd
)
1131 mtime
= s
->objfile
->mtime
;
1133 mtime
= exec_bfd_mtime
;
1135 if (mtime
&& mtime
< st
.st_mtime
)
1136 warning (_("Source file is more recent than executable."));
1139 struct cleanup
*old_cleanups
;
1141 /* st_size might be a large type, but we only support source files whose
1142 size fits in an int. */
1143 size
= (int) st
.st_size
;
1145 /* Use malloc, not alloca, because this may be pretty large, and we may
1146 run into various kinds of limits on stack size. */
1147 data
= (char *) xmalloc (size
);
1148 old_cleanups
= make_cleanup (xfree
, data
);
1150 /* Reassign `size' to result of read for systems where \r\n -> \n. */
1151 size
= myread (desc
, data
, size
);
1153 perror_with_name (s
->filename
);
1156 line_charpos
[0] = 0;
1161 /* A newline at the end does not start a new line. */
1164 if (nlines
== lines_allocated
)
1166 lines_allocated
*= 2;
1168 (int *) xrealloc ((char *) line_charpos
,
1169 sizeof (int) * lines_allocated
);
1171 line_charpos
[nlines
++] = p
- data
;
1174 do_cleanups (old_cleanups
);
1179 (int *) xrealloc ((char *) line_charpos
, nlines
* sizeof (int));
1185 /* Get full pathname and line number positions for a symtab.
1186 Return nonzero if line numbers may have changed.
1187 Set *FULLNAME to actual name of the file as found by `openp',
1188 or to 0 if the file is not found. */
1191 get_filename_and_charpos (struct symtab
*s
, char **fullname
)
1193 int desc
, linenums_changed
= 0;
1194 struct cleanup
*cleanups
;
1196 desc
= open_source_file (s
);
1203 cleanups
= make_cleanup_close (desc
);
1205 *fullname
= s
->fullname
;
1206 if (s
->line_charpos
== 0)
1207 linenums_changed
= 1;
1208 if (linenums_changed
)
1209 find_source_lines (s
, desc
);
1210 do_cleanups (cleanups
);
1211 return linenums_changed
;
1214 /* Print text describing the full name of the source file S
1215 and the line number LINE and its corresponding character position.
1216 The text starts with two Ctrl-z so that the Emacs-GDB interface
1219 MID_STATEMENT is nonzero if the PC is not at the beginning of that line.
1221 Return 1 if successful, 0 if could not find the file. */
1224 identify_source_line (struct symtab
*s
, int line
, int mid_statement
,
1227 if (s
->line_charpos
== 0)
1228 get_filename_and_charpos (s
, (char **) NULL
);
1229 if (s
->fullname
== 0)
1231 if (line
> s
->nlines
)
1232 /* Don't index off the end of the line_charpos array. */
1234 annotate_source (s
->fullname
, line
, s
->line_charpos
[line
- 1],
1235 mid_statement
, get_objfile_arch (s
->objfile
), pc
);
1237 current_source_line
= line
;
1238 first_line_listed
= line
;
1239 last_line_listed
= line
;
1240 current_source_symtab
= s
;
1245 /* Print source lines from the file of symtab S,
1246 starting with line number LINE and stopping before line number STOPLINE. */
1248 static void print_source_lines_base (struct symtab
*s
, int line
, int stopline
,
1251 print_source_lines_base (struct symtab
*s
, int line
, int stopline
, int noerror
)
1257 int nlines
= stopline
- line
;
1258 struct cleanup
*cleanup
;
1259 struct ui_out
*uiout
= current_uiout
;
1261 /* Regardless of whether we can open the file, set current_source_symtab. */
1262 current_source_symtab
= s
;
1263 current_source_line
= line
;
1264 first_line_listed
= line
;
1266 /* If printing of source lines is disabled, just print file and line
1268 if (ui_out_test_flags (uiout
, ui_source_list
))
1270 /* Only prints "No such file or directory" once. */
1271 if ((s
!= last_source_visited
) || (!last_source_error
))
1273 last_source_visited
= s
;
1274 desc
= open_source_file (s
);
1278 desc
= last_source_error
;
1284 desc
= last_source_error
;
1289 if (desc
< 0 || noprint
)
1291 last_source_error
= desc
;
1295 char *name
= alloca (strlen (s
->filename
) + 100);
1296 sprintf (name
, "%d\t%s", line
, s
->filename
);
1297 print_sys_errmsg (name
, errno
);
1301 ui_out_field_int (uiout
, "line", line
);
1302 ui_out_text (uiout
, "\tin ");
1303 ui_out_field_string (uiout
, "file", s
->filename
);
1304 if (ui_out_is_mi_like_p (uiout
))
1306 const char *fullname
= symtab_to_fullname (s
);
1308 if (fullname
!= NULL
)
1309 ui_out_field_string (uiout
, "fullname", fullname
);
1311 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
;
1400 struct cleanup
*cleanups
;
1402 init_sal (&sal
); /* initialize to zeroes */
1406 sal
.symtab
= current_source_symtab
;
1407 sal
.pspace
= current_program_space
;
1408 sal
.line
= last_line_listed
;
1410 sals
.sals
= (struct symtab_and_line
*)
1411 xmalloc (sizeof (struct symtab_and_line
));
1416 sals
= decode_line_with_last_displayed (arg
, DECODE_LINE_LIST_MODE
);
1421 cleanups
= make_cleanup (xfree
, sals
.sals
);
1423 /* C++ More than one line may have been specified, as when the user
1424 specifies an overloaded function name. Print info on them all. */
1425 for (i
= 0; i
< sals
.nelts
; i
++)
1428 if (sal
.pspace
!= current_program_space
)
1431 if (sal
.symtab
== 0)
1433 struct gdbarch
*gdbarch
= get_current_arch ();
1435 printf_filtered (_("No line number information available"));
1438 /* This is useful for "info line *0x7f34". If we can't tell the
1439 user about a source line, at least let them have the symbolic
1441 printf_filtered (" for address ");
1443 print_address (gdbarch
, sal
.pc
, gdb_stdout
);
1446 printf_filtered (".");
1447 printf_filtered ("\n");
1449 else if (sal
.line
> 0
1450 && find_line_pc_range (sal
, &start_pc
, &end_pc
))
1452 struct gdbarch
*gdbarch
= get_objfile_arch (sal
.symtab
->objfile
);
1454 if (start_pc
== end_pc
)
1456 printf_filtered ("Line %d of \"%s\"",
1457 sal
.line
, sal
.symtab
->filename
);
1459 printf_filtered (" is at address ");
1460 print_address (gdbarch
, start_pc
, gdb_stdout
);
1462 printf_filtered (" but contains no code.\n");
1466 printf_filtered ("Line %d of \"%s\"",
1467 sal
.line
, sal
.symtab
->filename
);
1469 printf_filtered (" starts at address ");
1470 print_address (gdbarch
, start_pc
, gdb_stdout
);
1472 printf_filtered (" and ends at ");
1473 print_address (gdbarch
, end_pc
, gdb_stdout
);
1474 printf_filtered (".\n");
1477 /* x/i should display this line's code. */
1478 set_next_address (gdbarch
, start_pc
);
1480 /* Repeating "info line" should do the following line. */
1481 last_line_listed
= sal
.line
+ 1;
1483 /* If this is the only line, show the source code. If it could
1484 not find the file, don't do anything special. */
1485 if (annotation_level
&& sals
.nelts
== 1)
1486 identify_source_line (sal
.symtab
, sal
.line
, 0, start_pc
);
1489 /* Is there any case in which we get here, and have an address
1490 which the user would want to see? If we have debugging symbols
1491 and no line numbers? */
1492 printf_filtered (_("Line number %d is out of range for \"%s\".\n"),
1493 sal
.line
, sal
.symtab
->filename
);
1495 do_cleanups (cleanups
);
1498 /* Commands to search the source file for a regexp. */
1501 forward_search_command (char *regex
, int from_tty
)
1508 struct cleanup
*cleanups
;
1510 line
= last_line_listed
+ 1;
1512 msg
= (char *) re_comp (regex
);
1514 error (("%s"), msg
);
1516 if (current_source_symtab
== 0)
1517 select_source_symtab (0);
1519 desc
= open_source_file (current_source_symtab
);
1521 perror_with_name (current_source_symtab
->filename
);
1522 cleanups
= make_cleanup_close (desc
);
1524 if (current_source_symtab
->line_charpos
== 0)
1525 find_source_lines (current_source_symtab
, desc
);
1527 if (line
< 1 || line
> current_source_symtab
->nlines
)
1528 error (_("Expression not found"));
1530 if (lseek (desc
, current_source_symtab
->line_charpos
[line
- 1], 0) < 0)
1531 perror_with_name (current_source_symtab
->filename
);
1533 discard_cleanups (cleanups
);
1534 stream
= fdopen (desc
, FDOPEN_MODE
);
1536 cleanups
= make_cleanup_fclose (stream
);
1539 static char *buf
= NULL
;
1541 int cursize
, newsize
;
1544 buf
= xmalloc (cursize
);
1553 if (p
- buf
== cursize
)
1555 newsize
= cursize
+ cursize
/ 2;
1556 buf
= xrealloc (buf
, newsize
);
1561 while (c
!= '\n' && (c
= getc (stream
)) >= 0);
1563 /* Remove the \r, if any, at the end of the line, otherwise
1564 regular expressions that end with $ or \n won't work. */
1565 if (p
- buf
> 1 && p
[-2] == '\r')
1571 /* We now have a source line in buf, null terminate and match. */
1573 if (re_exec (buf
) > 0)
1576 do_cleanups (cleanups
);
1577 print_source_lines (current_source_symtab
, line
, line
+ 1, 0);
1578 set_internalvar_integer (lookup_internalvar ("_"), line
);
1579 current_source_line
= max (line
- lines_to_list
/ 2, 1);
1585 printf_filtered (_("Expression not found\n"));
1586 do_cleanups (cleanups
);
1590 reverse_search_command (char *regex
, int from_tty
)
1597 struct cleanup
*cleanups
;
1599 line
= last_line_listed
- 1;
1601 msg
= (char *) re_comp (regex
);
1603 error (("%s"), msg
);
1605 if (current_source_symtab
== 0)
1606 select_source_symtab (0);
1608 desc
= open_source_file (current_source_symtab
);
1610 perror_with_name (current_source_symtab
->filename
);
1611 cleanups
= make_cleanup_close (desc
);
1613 if (current_source_symtab
->line_charpos
== 0)
1614 find_source_lines (current_source_symtab
, desc
);
1616 if (line
< 1 || line
> current_source_symtab
->nlines
)
1617 error (_("Expression not found"));
1619 if (lseek (desc
, current_source_symtab
->line_charpos
[line
- 1], 0) < 0)
1620 perror_with_name (current_source_symtab
->filename
);
1622 discard_cleanups (cleanups
);
1623 stream
= fdopen (desc
, FDOPEN_MODE
);
1625 cleanups
= make_cleanup_fclose (stream
);
1628 /* FIXME!!! We walk right off the end of buf if we get a long line!!! */
1629 char buf
[4096]; /* Should be reasonable??? */
1639 while (c
!= '\n' && (c
= getc (stream
)) >= 0);
1641 /* Remove the \r, if any, at the end of the line, otherwise
1642 regular expressions that end with $ or \n won't work. */
1643 if (p
- buf
> 1 && p
[-2] == '\r')
1649 /* We now have a source line in buf; null terminate and match. */
1651 if (re_exec (buf
) > 0)
1654 do_cleanups (cleanups
);
1655 print_source_lines (current_source_symtab
, line
, line
+ 1, 0);
1656 set_internalvar_integer (lookup_internalvar ("_"), line
);
1657 current_source_line
= max (line
- lines_to_list
/ 2, 1);
1661 if (fseek (stream
, current_source_symtab
->line_charpos
[line
- 1], 0) < 0)
1663 do_cleanups (cleanups
);
1664 perror_with_name (current_source_symtab
->filename
);
1668 printf_filtered (_("Expression not found\n"));
1669 do_cleanups (cleanups
);
1673 /* If the last character of PATH is a directory separator, then strip it. */
1676 strip_trailing_directory_separator (char *path
)
1678 const int last
= strlen (path
) - 1;
1681 return; /* No stripping is needed if PATH is the empty string. */
1683 if (IS_DIR_SEPARATOR (path
[last
]))
1687 /* Return the path substitution rule that matches FROM.
1688 Return NULL if no rule matches. */
1690 static struct substitute_path_rule
*
1691 find_substitute_path_rule (const char *from
)
1693 struct substitute_path_rule
*rule
= substitute_path_rules
;
1695 while (rule
!= NULL
)
1697 if (FILENAME_CMP (rule
->from
, from
) == 0)
1705 /* Add a new substitute-path rule at the end of the current list of rules.
1706 The new rule will replace FROM into TO. */
1709 add_substitute_path_rule (char *from
, char *to
)
1711 struct substitute_path_rule
*rule
;
1712 struct substitute_path_rule
*new_rule
;
1714 new_rule
= xmalloc (sizeof (struct substitute_path_rule
));
1715 new_rule
->from
= xstrdup (from
);
1716 new_rule
->to
= xstrdup (to
);
1717 new_rule
->next
= NULL
;
1719 /* If the list of rules are empty, then insert the new rule
1720 at the head of the list. */
1722 if (substitute_path_rules
== NULL
)
1724 substitute_path_rules
= new_rule
;
1728 /* Otherwise, skip to the last rule in our list and then append
1731 rule
= substitute_path_rules
;
1732 while (rule
->next
!= NULL
)
1735 rule
->next
= new_rule
;
1738 /* Remove the given source path substitution rule from the current list
1739 of rules. The memory allocated for that rule is also deallocated. */
1742 delete_substitute_path_rule (struct substitute_path_rule
*rule
)
1744 if (rule
== substitute_path_rules
)
1745 substitute_path_rules
= rule
->next
;
1748 struct substitute_path_rule
*prev
= substitute_path_rules
;
1750 while (prev
!= NULL
&& prev
->next
!= rule
)
1753 gdb_assert (prev
!= NULL
);
1755 prev
->next
= rule
->next
;
1763 /* Implement the "show substitute-path" command. */
1766 show_substitute_path_command (char *args
, int from_tty
)
1768 struct substitute_path_rule
*rule
= substitute_path_rules
;
1772 argv
= gdb_buildargv (args
);
1773 make_cleanup_freeargv (argv
);
1775 /* We expect zero or one argument. */
1777 if (argv
!= NULL
&& argv
[0] != NULL
&& argv
[1] != NULL
)
1778 error (_("Too many arguments in command"));
1780 if (argv
!= NULL
&& argv
[0] != NULL
)
1783 /* Print the substitution rules. */
1787 (_("Source path substitution rule matching `%s':\n"), from
);
1789 printf_filtered (_("List of all source path substitution rules:\n"));
1791 while (rule
!= NULL
)
1793 if (from
== NULL
|| FILENAME_CMP (rule
->from
, from
) == 0)
1794 printf_filtered (" `%s' -> `%s'.\n", rule
->from
, rule
->to
);
1799 /* Implement the "unset substitute-path" command. */
1802 unset_substitute_path_command (char *args
, int from_tty
)
1804 struct substitute_path_rule
*rule
= substitute_path_rules
;
1805 char **argv
= gdb_buildargv (args
);
1809 /* This function takes either 0 or 1 argument. */
1811 make_cleanup_freeargv (argv
);
1812 if (argv
!= NULL
&& argv
[0] != NULL
&& argv
[1] != NULL
)
1813 error (_("Incorrect usage, too many arguments in command"));
1815 if (argv
!= NULL
&& argv
[0] != NULL
)
1818 /* If the user asked for all the rules to be deleted, ask him
1819 to confirm and give him a chance to abort before the action
1823 && !query (_("Delete all source path substitution rules? ")))
1824 error (_("Canceled"));
1826 /* Delete the rule matching the argument. No argument means that
1827 all rules should be deleted. */
1829 while (rule
!= NULL
)
1831 struct substitute_path_rule
*next
= rule
->next
;
1833 if (from
== NULL
|| FILENAME_CMP (from
, rule
->from
) == 0)
1835 delete_substitute_path_rule (rule
);
1842 /* If the user asked for a specific rule to be deleted but
1843 we could not find it, then report an error. */
1845 if (from
!= NULL
&& !rule_found
)
1846 error (_("No substitution rule defined for `%s'"), from
);
1848 forget_cached_source_info ();
1851 /* Add a new source path substitution rule. */
1854 set_substitute_path_command (char *args
, int from_tty
)
1857 struct substitute_path_rule
*rule
;
1859 argv
= gdb_buildargv (args
);
1860 make_cleanup_freeargv (argv
);
1862 if (argv
== NULL
|| argv
[0] == NULL
|| argv
[1] == NULL
)
1863 error (_("Incorrect usage, too few arguments in command"));
1865 if (argv
[2] != NULL
)
1866 error (_("Incorrect usage, too many arguments in command"));
1868 if (*(argv
[0]) == '\0')
1869 error (_("First argument must be at least one character long"));
1871 /* Strip any trailing directory separator character in either FROM
1872 or TO. The substitution rule already implicitly contains them. */
1873 strip_trailing_directory_separator (argv
[0]);
1874 strip_trailing_directory_separator (argv
[1]);
1876 /* If a rule with the same "from" was previously defined, then
1877 delete it. This new rule replaces it. */
1879 rule
= find_substitute_path_rule (argv
[0]);
1881 delete_substitute_path_rule (rule
);
1883 /* Insert the new substitution rule. */
1885 add_substitute_path_rule (argv
[0], argv
[1]);
1886 forget_cached_source_info ();
1891 _initialize_source (void)
1893 struct cmd_list_element
*c
;
1895 current_source_symtab
= 0;
1896 init_source_path ();
1898 /* The intention is to use POSIX Basic Regular Expressions.
1899 Always use the GNU regex routine for consistency across all hosts.
1900 Our current GNU regex.c does not have all the POSIX features, so this is
1901 just an approximation. */
1902 re_set_syntax (RE_SYNTAX_GREP
);
1904 c
= add_cmd ("directory", class_files
, directory_command
, _("\
1905 Add directory DIR to beginning of search path for source files.\n\
1906 Forget cached info on source file locations and line positions.\n\
1907 DIR can also be $cwd for the current working directory, or $cdir for the\n\
1908 directory in which the source file was compiled into object code.\n\
1909 With no argument, reset the search path to $cdir:$cwd, the default."),
1913 add_com_alias ("use", "directory", class_files
, 0);
1915 set_cmd_completer (c
, filename_completer
);
1917 add_setshow_optional_filename_cmd ("directories",
1921 Set the search path for finding source files."),
1923 Show the search path for finding source files."),
1925 $cwd in the path means the current working directory.\n\
1926 $cdir in the path means the compilation directory of the source file.\n\
1927 GDB ensures the search path always ends with $cdir:$cwd by\n\
1928 appending these directories if necessary.\n\
1929 Setting the value to an empty string sets it to $cdir:$cwd, the default."),
1930 set_directories_command
,
1931 show_directories_command
,
1932 &setlist
, &showlist
);
1936 add_com_alias ("D", "directory", class_files
, 0);
1937 add_cmd ("ld", no_class
, show_directories_1
, _("\
1938 Current search path for finding source files.\n\
1939 $cwd in the path means the current working directory.\n\
1940 $cdir in the path means the compilation directory of the source file."),
1944 add_info ("source", source_info
,
1945 _("Information about the current source file."));
1947 add_info ("line", line_info
, _("\
1948 Core addresses of the code for a source line.\n\
1949 Line can be specified as\n\
1950 LINENUM, to list around that line in current file,\n\
1951 FILE:LINENUM, to list around that line in that file,\n\
1952 FUNCTION, to list around beginning of that function,\n\
1953 FILE:FUNCTION, to distinguish among like-named static functions.\n\
1954 Default is to describe the last source line that was listed.\n\n\
1955 This sets the default address for \"x\" to the line's first instruction\n\
1956 so that \"x/i\" suffices to start examining the machine code.\n\
1957 The address is also stored as the value of \"$_\"."));
1959 add_com ("forward-search", class_files
, forward_search_command
, _("\
1960 Search for regular expression (see regex(3)) from last line listed.\n\
1961 The matching line number is also stored as the value of \"$_\"."));
1962 add_com_alias ("search", "forward-search", class_files
, 0);
1963 add_com_alias ("fo", "forward-search", class_files
, 1);
1965 add_com ("reverse-search", class_files
, reverse_search_command
, _("\
1966 Search backward for regular expression (see regex(3)) from last line listed.\n\
1967 The matching line number is also stored as the value of \"$_\"."));
1968 add_com_alias ("rev", "reverse-search", class_files
, 1);
1972 add_com_alias ("/", "forward-search", class_files
, 0);
1973 add_com_alias ("?", "reverse-search", class_files
, 0);
1976 add_setshow_zuinteger_unlimited_cmd ("listsize", class_support
,
1977 &lines_to_list
, _("\
1978 Set number of source lines gdb will list by default."), _("\
1979 Show number of source lines gdb will list by default."), NULL
,
1980 NULL
, show_lines_to_list
,
1981 &setlist
, &showlist
);
1983 add_cmd ("substitute-path", class_files
, set_substitute_path_command
,
1985 Usage: set substitute-path FROM TO\n\
1986 Add a substitution rule replacing FROM into TO in source file names.\n\
1987 If a substitution rule was previously set for FROM, the old rule\n\
1988 is replaced by the new one."),
1991 add_cmd ("substitute-path", class_files
, unset_substitute_path_command
,
1993 Usage: unset substitute-path [FROM]\n\
1994 Delete the rule for substituting FROM in source file names. If FROM\n\
1995 is not specified, all substituting rules are deleted.\n\
1996 If the debugger cannot find a rule for FROM, it will display a warning."),
1999 add_cmd ("substitute-path", class_files
, show_substitute_path_command
,
2001 Usage: show substitute-path [FROM]\n\
2002 Print the rule for substituting FROM in source file names. If FROM\n\
2003 is not specified, print all substitution rules."),