1 /* List lines of source files for GDB, the GNU debugger.
2 Copyright (C) 1986-2018 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 "filestuff.h"
31 #include <sys/types.h>
34 #include "gdb_regex.h"
40 #include "filenames.h" /* for DOSish file names */
41 #include "completer.h"
43 #include "readline/readline.h"
44 #include "common/enum-flags.h"
45 #include "common/scoped_fd.h"
47 #include "common/pathstuff.h"
49 #define OPEN_MODE (O_RDONLY | O_BINARY)
50 #define FDOPEN_MODE FOPEN_RB
52 /* Prototypes for local functions. */
54 static int get_filename_and_charpos (struct symtab *, char **);
56 /* Path of directories to search for source files.
57 Same format as the PATH environment variable's value. */
61 /* Support for source path substitution commands. */
63 struct substitute_path_rule
67 struct substitute_path_rule *next;
70 static struct substitute_path_rule *substitute_path_rules = NULL;
72 /* Symtab of default file for listing lines of. */
74 static struct symtab *current_source_symtab;
76 /* Default next line to list. */
78 static int current_source_line;
80 static struct program_space *current_source_pspace;
82 /* Default number of lines to print with commands like "list".
83 This is based on guessing how many long (i.e. more than chars_per_line
84 characters) lines there will be. To be completely correct, "list"
85 and friends should be rewritten to count characters and see where
86 things are wrapping, but that would be a fair amount of work. */
88 static int lines_to_list = 10;
90 show_lines_to_list (struct ui_file *file, int from_tty,
91 struct cmd_list_element *c, const char *value)
93 fprintf_filtered (file,
94 _("Number of source lines gdb "
95 "will list by default is %s.\n"),
99 /* Possible values of 'set filename-display'. */
100 static const char filename_display_basename[] = "basename";
101 static const char filename_display_relative[] = "relative";
102 static const char filename_display_absolute[] = "absolute";
104 static const char *const filename_display_kind_names[] = {
105 filename_display_basename,
106 filename_display_relative,
107 filename_display_absolute,
111 static const char *filename_display_string = filename_display_relative;
114 show_filename_display_string (struct ui_file *file, int from_tty,
115 struct cmd_list_element *c, const char *value)
117 fprintf_filtered (file, _("Filenames are displayed as \"%s\".\n"), value);
120 /* Line number of last line printed. Default for various commands.
121 current_source_line is usually, but not always, the same as this. */
123 static int last_line_listed;
125 /* First line number listed by last listing command. If 0, then no
126 source lines have yet been listed since the last time the current
127 source line was changed. */
129 static int first_line_listed;
131 /* Saves the name of the last source file visited and a possible error code.
132 Used to prevent repeating annoying "No such file or directories" msgs. */
134 static struct symtab *last_source_visited = NULL;
135 static int last_source_error = 0;
137 /* Return the first line listed by print_source_lines.
138 Used by command interpreters to request listing from
142 get_first_line_listed (void)
144 return first_line_listed;
147 /* Clear line listed range. This makes the next "list" center the
148 printed source lines around the current source line. */
151 clear_lines_listed_range (void)
153 first_line_listed = 0;
154 last_line_listed = 0;
157 /* Return the default number of lines to print with commands like the
158 cli "list". The caller of print_source_lines must use this to
159 calculate the end line and use it in the call to print_source_lines
160 as it does not automatically use this value. */
163 get_lines_to_list (void)
165 return lines_to_list;
168 /* Return the current source file for listing and next line to list.
169 NOTE: The returned sal pc and end fields are not valid. */
171 struct symtab_and_line
172 get_current_source_symtab_and_line (void)
174 symtab_and_line cursal;
176 cursal.pspace = current_source_pspace;
177 cursal.symtab = current_source_symtab;
178 cursal.line = current_source_line;
185 /* If the current source file for listing is not set, try and get a default.
186 Usually called before get_current_source_symtab_and_line() is called.
187 It may err out if a default cannot be determined.
188 We must be cautious about where it is called, as it can recurse as the
189 process of determining a new default may call the caller!
190 Use get_current_source_symtab_and_line only to get whatever
191 we have without erroring out or trying to get a default. */
194 set_default_source_symtab_and_line (void)
196 if (!have_full_symbols () && !have_partial_symbols ())
197 error (_("No symbol table is loaded. Use the \"file\" command."));
199 /* Pull in a current source symtab if necessary. */
200 if (current_source_symtab == 0)
201 select_source_symtab (0);
204 /* Return the current default file for listing and next line to list
205 (the returned sal pc and end fields are not valid.)
206 and set the current default to whatever is in SAL.
207 NOTE: The returned sal pc and end fields are not valid. */
209 struct symtab_and_line
210 set_current_source_symtab_and_line (const symtab_and_line &sal)
212 symtab_and_line cursal;
214 cursal.pspace = current_source_pspace;
215 cursal.symtab = current_source_symtab;
216 cursal.line = current_source_line;
220 current_source_pspace = sal.pspace;
221 current_source_symtab = sal.symtab;
222 current_source_line = sal.line;
224 /* Force the next "list" to center around the current line. */
225 clear_lines_listed_range ();
230 /* Reset any information stored about a default file and line to print. */
233 clear_current_source_symtab_and_line (void)
235 current_source_symtab = 0;
236 current_source_line = 0;
239 /* Set the source file default for the "list" command to be S.
241 If S is NULL, and we don't have a default, find one. This
242 should only be called when the user actually tries to use the
243 default, since we produce an error if we can't find a reasonable
244 default. Also, since this can cause symbols to be read, doing it
245 before we need to would make things slower than necessary. */
248 select_source_symtab (struct symtab *s)
251 struct compunit_symtab *cu;
255 current_source_symtab = s;
256 current_source_line = 1;
257 current_source_pspace = SYMTAB_PSPACE (s);
261 if (current_source_symtab)
264 /* Make the default place to list be the function `main'
266 if (lookup_symbol (main_name (), 0, VAR_DOMAIN, 0).symbol)
268 std::vector<symtab_and_line> sals
269 = decode_line_with_current_source (main_name (),
270 DECODE_LINE_FUNFIRSTLINE);
271 const symtab_and_line &sal = sals[0];
272 current_source_pspace = sal.pspace;
273 current_source_symtab = sal.symtab;
274 current_source_line = std::max (sal.line - (lines_to_list - 1), 1);
275 if (current_source_symtab)
279 /* Alright; find the last file in the symtab list (ignoring .h's
280 and namespace symtabs). */
282 current_source_line = 1;
284 ALL_FILETABS (ofp, cu, s)
286 const char *name = s->filename;
287 int len = strlen (name);
289 if (!(len > 2 && (strcmp (&name[len - 2], ".h") == 0
290 || strcmp (name, "<<C++-namespaces>>") == 0)))
292 current_source_pspace = current_program_space;
293 current_source_symtab = s;
297 if (current_source_symtab)
303 s = ofp->sf->qf->find_last_source_symtab (ofp);
305 current_source_symtab = s;
307 if (current_source_symtab)
310 error (_("Can't find a default source file"));
313 /* Handler for "set directories path-list" command.
314 "set dir mumble" doesn't prepend paths, it resets the entire
315 path list. The theory is that set(show(dir)) should be a no-op. */
318 set_directories_command (const char *args,
319 int from_tty, struct cmd_list_element *c)
321 /* This is the value that was set.
322 It needs to be processed to maintain $cdir:$cwd and remove dups. */
323 char *set_path = source_path;
325 /* We preserve the invariant that $cdir:$cwd begins life at the end of
326 the list by calling init_source_path. If they appear earlier in
327 SET_PATH then mod_path will move them appropriately.
328 mod_path will also remove duplicates. */
330 if (*set_path != '\0')
331 mod_path (set_path, &source_path);
336 /* Print the list of source directories.
337 This is used by the "ld" command, so it has the signature of a command
341 show_directories_1 (char *ignore, int from_tty)
343 puts_filtered ("Source directories searched: ");
344 puts_filtered (source_path);
345 puts_filtered ("\n");
348 /* Handler for "show directories" command. */
351 show_directories_command (struct ui_file *file, int from_tty,
352 struct cmd_list_element *c, const char *value)
354 show_directories_1 (NULL, from_tty);
357 /* Forget line positions and file names for the symtabs in a
358 particular objfile. */
361 forget_cached_source_info_for_objfile (struct objfile *objfile)
363 struct compunit_symtab *cu;
366 ALL_OBJFILE_FILETABS (objfile, cu, s)
368 if (s->line_charpos != NULL)
370 xfree (s->line_charpos);
371 s->line_charpos = NULL;
373 if (s->fullname != NULL)
381 objfile->sf->qf->forget_cached_source_info (objfile);
384 /* Forget what we learned about line positions in source files, and
385 which directories contain them; must check again now since files
386 may be found in a different directory now. */
389 forget_cached_source_info (void)
391 struct program_space *pspace;
392 struct objfile *objfile;
395 ALL_PSPACE_OBJFILES (pspace, objfile)
397 forget_cached_source_info_for_objfile (objfile);
400 last_source_visited = NULL;
404 init_source_path (void)
408 xsnprintf (buf, sizeof (buf), "$cdir%c$cwd", DIRNAME_SEPARATOR);
409 source_path = xstrdup (buf);
410 forget_cached_source_info ();
413 /* Add zero or more directories to the front of the source path. */
416 directory_command (const char *dirname, int from_tty)
419 /* FIXME, this goes to "delete dir"... */
422 if (!from_tty || query (_("Reinitialize source path to empty? ")))
430 mod_path (dirname, &source_path);
431 forget_cached_source_info ();
434 show_directories_1 ((char *) 0, from_tty);
437 /* Add a path given with the -d command line switch.
438 This will not be quoted so we must not treat spaces as separators. */
441 directory_switch (const char *dirname, int from_tty)
443 add_path (dirname, &source_path, 0);
446 /* Add zero or more directories to the front of an arbitrary path. */
449 mod_path (const char *dirname, char **which_path)
451 add_path (dirname, which_path, 1);
454 /* Workhorse of mod_path. Takes an extra argument to determine
455 if dirname should be parsed for separators that indicate multiple
456 directories. This allows for interfaces that pre-parse the dirname
457 and allow specification of traditional separator characters such
461 add_path (const char *dirname, char **which_path, int parse_separators)
463 char *old = *which_path;
465 std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec;
470 if (parse_separators)
472 /* This will properly parse the space and tab separators
473 and any quotes that may exist. */
474 gdb_argv argv (dirname);
476 for (char *arg : argv)
477 dirnames_to_char_ptr_vec_append (&dir_vec, arg);
480 dir_vec.emplace_back (xstrdup (dirname));
482 for (const gdb::unique_xmalloc_ptr<char> &name_up : dir_vec)
484 char *name = name_up.get ();
487 gdb::unique_xmalloc_ptr<char> new_name_holder;
489 /* Spaces and tabs will have been removed by buildargv().
490 NAME is the start of the directory.
491 P is the '\0' following the end. */
492 p = name + strlen (name);
494 while (!(IS_DIR_SEPARATOR (*name) && p <= name + 1) /* "/" */
495 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
496 /* On MS-DOS and MS-Windows, h:\ is different from h: */
497 && !(p == name + 3 && name[1] == ':') /* "d:/" */
499 && IS_DIR_SEPARATOR (p[-1]))
500 /* Sigh. "foo/" => "foo" */
504 while (p > name && p[-1] == '.')
508 /* "." => getwd (). */
509 name = current_directory;
512 else if (p > name + 1 && IS_DIR_SEPARATOR (p[-2]))
522 /* "...foo/." => "...foo". */
533 new_name_holder.reset (tilde_expand (name));
534 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
535 else if (IS_ABSOLUTE_PATH (name) && p == name + 2) /* "d:" => "d:." */
536 new_name_holder.reset (concat (name, ".", (char *) NULL));
538 else if (!IS_ABSOLUTE_PATH (name) && name[0] != '$')
539 new_name_holder.reset (concat (current_directory, SLASH_STRING, name,
542 new_name_holder.reset (savestring (name, p - name));
543 name = new_name_holder.get ();
545 /* Unless it's a variable, check existence. */
548 /* These are warnings, not errors, since we don't want a
549 non-existent directory in a .gdbinit file to stop processing
550 of the .gdbinit file.
552 Whether they get added to the path is more debatable. Current
553 answer is yes, in case the user wants to go make the directory
554 or whatever. If the directory continues to not exist/not be
555 a directory/etc, then having them in the path should be
557 if (stat (name, &st) < 0)
559 int save_errno = errno;
561 fprintf_unfiltered (gdb_stderr, "Warning: ");
562 print_sys_errmsg (name, save_errno);
564 else if ((st.st_mode & S_IFMT) != S_IFDIR)
565 warning (_("%s is not a directory."), name);
570 unsigned int len = strlen (name);
576 /* FIXME: we should use realpath() or its work-alike
577 before comparing. Then all the code above which
578 removes excess slashes and dots could simply go away. */
579 if (!filename_ncmp (p, name, len)
580 && (p[len] == '\0' || p[len] == DIRNAME_SEPARATOR))
582 /* Found it in the search path, remove old copy. */
585 /* Back over leading separator. */
588 if (prefix > p - *which_path)
590 /* Same dir twice in one cmd. */
593 /* Copy from next '\0' or ':'. */
594 memmove (p, &p[len + 1], strlen (&p[len + 1]) + 1);
596 p = strchr (p, DIRNAME_SEPARATOR);
603 tinybuf[0] = DIRNAME_SEPARATOR;
606 /* If we have already tacked on a name(s) in this command,
607 be sure they stay on the front as we tack on some
615 temp = concat (old, tinybuf, name, (char *)NULL);
617 *which_path = concat (temp, "", &old[prefix], (char *) NULL);
618 prefix = strlen (temp);
623 *which_path = concat (name, (old[0] ? tinybuf : old),
625 prefix = strlen (name);
637 info_source_command (const char *ignore, int from_tty)
639 struct symtab *s = current_source_symtab;
640 struct compunit_symtab *cust;
644 printf_filtered (_("No current source file.\n"));
648 cust = SYMTAB_COMPUNIT (s);
649 printf_filtered (_("Current source file is %s\n"), s->filename);
650 if (SYMTAB_DIRNAME (s) != NULL)
651 printf_filtered (_("Compilation directory is %s\n"), SYMTAB_DIRNAME (s));
653 printf_filtered (_("Located in %s\n"), s->fullname);
655 printf_filtered (_("Contains %d line%s.\n"), s->nlines,
656 s->nlines == 1 ? "" : "s");
658 printf_filtered (_("Source language is %s.\n"), language_str (s->language));
659 printf_filtered (_("Producer is %s.\n"),
660 COMPUNIT_PRODUCER (cust) != NULL
661 ? COMPUNIT_PRODUCER (cust) : _("unknown"));
662 printf_filtered (_("Compiled with %s debugging format.\n"),
663 COMPUNIT_DEBUGFORMAT (cust));
664 printf_filtered (_("%s preprocessor macro info.\n"),
665 COMPUNIT_MACRO_TABLE (cust) != NULL
666 ? "Includes" : "Does not include");
670 /* Open a file named STRING, searching path PATH (dir names sep by some char)
671 using mode MODE in the calls to open. You cannot use this function to
672 create files (O_CREAT).
674 OPTS specifies the function behaviour in specific cases.
676 If OPF_TRY_CWD_FIRST, try to open ./STRING before searching PATH.
677 (ie pretend the first element of PATH is "."). This also indicates
678 that, unless OPF_SEARCH_IN_PATH is also specified, a slash in STRING
679 disables searching of the path (this is so that "exec-file ./foo" or
680 "symbol-file ./foo" insures that you get that particular version of
681 foo or an error message).
683 If OPTS has OPF_SEARCH_IN_PATH set, absolute names will also be
684 searched in path (we usually want this for source files but not for
687 If FILENAME_OPENED is non-null, set it to a newly allocated string naming
688 the actual file opened (this string will always start with a "/"). We
689 have to take special pains to avoid doubling the "/" between the directory
690 and the file, sigh! Emacs gets confuzzed by this when we print the
693 If OPTS has OPF_RETURN_REALPATH set return FILENAME_OPENED resolved by
694 gdb_realpath. Even without OPF_RETURN_REALPATH this function still returns
695 filename starting with "/". If FILENAME_OPENED is NULL this option has no
698 If a file is found, return the descriptor.
699 Otherwise, return -1, with errno set for the last name we tried to open. */
701 /* >>>> This should only allow files of certain types,
702 >>>> eg executable, non-directory. */
704 openp (const char *path, openp_flags opts, const char *string,
705 int mode, gdb::unique_xmalloc_ptr<char> *filename_opened)
710 /* The errno set for the last name we tried to open (and
713 std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec;
715 /* The open syscall MODE parameter is not specified. */
716 gdb_assert ((mode & O_CREAT) == 0);
717 gdb_assert (string != NULL);
719 /* A file with an empty name cannot possibly exist. Report a failure
720 without further checking.
722 This is an optimization which also defends us against buggy
723 implementations of the "stat" function. For instance, we have
724 noticed that a MinGW debugger built on Windows XP 32bits crashes
725 when the debugger is started with an empty argument. */
726 if (string[0] == '\0')
737 if ((opts & OPF_TRY_CWD_FIRST) || IS_ABSOLUTE_PATH (string))
739 int i, reg_file_errno;
741 if (is_regular_file (string, ®_file_errno))
743 filename = (char *) alloca (strlen (string) + 1);
744 strcpy (filename, string);
745 fd = gdb_open_cloexec (filename, mode, 0);
754 last_errno = reg_file_errno;
757 if (!(opts & OPF_SEARCH_IN_PATH))
758 for (i = 0; string[i]; i++)
759 if (IS_DIR_SEPARATOR (string[i]))
763 /* For dos paths, d:/foo -> /foo, and d:foo -> foo. */
764 if (HAS_DRIVE_SPEC (string))
765 string = STRIP_DRIVE_SPEC (string);
767 /* /foo => foo, to avoid multiple slashes that Emacs doesn't like. */
768 while (IS_DIR_SEPARATOR(string[0]))
772 while (string[0] == '.' && IS_DIR_SEPARATOR (string[1]))
775 alloclen = strlen (path) + strlen (string) + 2;
776 filename = (char *) alloca (alloclen);
780 dir_vec = dirnames_to_char_ptr_vec (path);
782 for (const gdb::unique_xmalloc_ptr<char> &dir_up : dir_vec)
784 char *dir = dir_up.get ();
785 size_t len = strlen (dir);
788 if (strcmp (dir, "$cwd") == 0)
790 /* Name is $cwd -- insert current directory name instead. */
793 /* First, realloc the filename buffer if too short. */
794 len = strlen (current_directory);
795 newlen = len + strlen (string) + 2;
796 if (newlen > alloclen)
799 filename = (char *) alloca (alloclen);
801 strcpy (filename, current_directory);
803 else if (strchr(dir, '~'))
805 /* See whether we need to expand the tilde. */
808 gdb::unique_xmalloc_ptr<char> tilde_expanded (tilde_expand (dir));
810 /* First, realloc the filename buffer if too short. */
811 len = strlen (tilde_expanded.get ());
812 newlen = len + strlen (string) + 2;
813 if (newlen > alloclen)
816 filename = (char *) alloca (alloclen);
818 strcpy (filename, tilde_expanded.get ());
822 /* Normal file name in path -- just use it. */
823 strcpy (filename, dir);
825 /* Don't search $cdir. It's also a magic path like $cwd, but we
826 don't have enough information to expand it. The user *could*
827 have an actual directory named '$cdir' but handling that would
828 be confusing, it would mean different things in different
829 contexts. If the user really has '$cdir' one can use './$cdir'.
830 We can get $cdir when loading scripts. When loading source files
831 $cdir must have already been expanded to the correct value. */
832 if (strcmp (dir, "$cdir") == 0)
836 /* Remove trailing slashes. */
837 while (len > 0 && IS_DIR_SEPARATOR (filename[len - 1]))
840 strcat (filename + len, SLASH_STRING);
841 strcat (filename, string);
843 if (is_regular_file (filename, ®_file_errno))
845 fd = gdb_open_cloexec (filename, mode, 0);
851 last_errno = reg_file_errno;
857 /* If a file was opened, canonicalize its filename. */
859 filename_opened->reset (NULL);
860 else if ((opts & OPF_RETURN_REALPATH) != 0)
861 *filename_opened = gdb_realpath (filename);
863 *filename_opened = gdb_abspath (filename);
871 /* This is essentially a convenience, for clients that want the behaviour
872 of openp, using source_path, but that really don't want the file to be
873 opened but want instead just to know what the full pathname is (as
874 qualified against source_path).
876 The current working directory is searched first.
878 If the file was found, this function returns 1, and FULL_PATHNAME is
879 set to the fully-qualified pathname.
881 Else, this functions returns 0, and FULL_PATHNAME is set to NULL. */
883 source_full_path_of (const char *filename,
884 gdb::unique_xmalloc_ptr<char> *full_pathname)
888 fd = openp (source_path,
889 OPF_TRY_CWD_FIRST | OPF_SEARCH_IN_PATH | OPF_RETURN_REALPATH,
890 filename, O_RDONLY, full_pathname);
893 full_pathname->reset (NULL);
901 /* Return non-zero if RULE matches PATH, that is if the rule can be
905 substitute_path_rule_matches (const struct substitute_path_rule *rule,
908 const int from_len = strlen (rule->from);
909 const int path_len = strlen (path);
911 if (path_len < from_len)
914 /* The substitution rules are anchored at the start of the path,
915 so the path should start with rule->from. */
917 if (filename_ncmp (path, rule->from, from_len) != 0)
920 /* Make sure that the region in the path that matches the substitution
921 rule is immediately followed by a directory separator (or the end of
922 string character). */
924 if (path[from_len] != '\0' && !IS_DIR_SEPARATOR (path[from_len]))
930 /* Find the substitute-path rule that applies to PATH and return it.
931 Return NULL if no rule applies. */
933 static struct substitute_path_rule *
934 get_substitute_path_rule (const char *path)
936 struct substitute_path_rule *rule = substitute_path_rules;
938 while (rule != NULL && !substitute_path_rule_matches (rule, path))
944 /* If the user specified a source path substitution rule that applies
945 to PATH, then apply it and return the new path.
947 Return NULL if no substitution rule was specified by the user,
948 or if no rule applied to the given PATH. */
950 gdb::unique_xmalloc_ptr<char>
951 rewrite_source_path (const char *path)
953 const struct substitute_path_rule *rule = get_substitute_path_rule (path);
960 from_len = strlen (rule->from);
962 /* Compute the rewritten path and return it. */
965 (char *) xmalloc (strlen (path) + 1 + strlen (rule->to) - from_len);
966 strcpy (new_path, rule->to);
967 strcat (new_path, path + from_len);
969 return gdb::unique_xmalloc_ptr<char> (new_path);
973 find_and_open_source (const char *filename,
975 gdb::unique_xmalloc_ptr<char> *fullname)
977 char *path = source_path;
981 /* Quick way out if we already know its full name. */
985 /* The user may have requested that source paths be rewritten
986 according to substitution rules he provided. If a substitution
987 rule applies to this path, then apply it. */
988 gdb::unique_xmalloc_ptr<char> rewritten_fullname
989 = rewrite_source_path (fullname->get ());
991 if (rewritten_fullname != NULL)
992 *fullname = std::move (rewritten_fullname);
994 result = gdb_open_cloexec (fullname->get (), OPEN_MODE, 0);
997 *fullname = gdb_realpath (fullname->get ());
1001 /* Didn't work -- free old one, try again. */
1002 fullname->reset (NULL);
1005 gdb::unique_xmalloc_ptr<char> rewritten_dirname;
1006 if (dirname != NULL)
1008 /* If necessary, rewrite the compilation directory name according
1009 to the source path substitution rules specified by the user. */
1011 rewritten_dirname = rewrite_source_path (dirname);
1013 if (rewritten_dirname != NULL)
1014 dirname = rewritten_dirname.get ();
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 gdb::unique_xmalloc_ptr<char> rewritten_filename;
1038 if (IS_ABSOLUTE_PATH (filename))
1040 /* If filename is absolute path, try the source path
1041 substitution on it. */
1042 rewritten_filename = rewrite_source_path (filename);
1044 if (rewritten_filename != NULL)
1045 filename = rewritten_filename.get ();
1048 result = openp (path, OPF_SEARCH_IN_PATH | OPF_RETURN_REALPATH, filename,
1049 OPEN_MODE, fullname);
1052 /* Didn't work. Try using just the basename. */
1053 p = lbasename (filename);
1055 result = openp (path, OPF_SEARCH_IN_PATH | OPF_RETURN_REALPATH, p,
1056 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 gdb::unique_xmalloc_ptr<char> fullname (s->fullname);
1075 int fd = find_and_open_source (s->filename, SYMTAB_DIRNAME (s), &fullname);
1076 s->fullname = fullname.release ();
1080 /* Finds the fullname that a symtab represents.
1082 This functions finds the fullname and saves it in s->fullname.
1083 It will also return the value.
1085 If this function fails to find the file that this symtab represents,
1086 the expected fullname is used. Therefore the files does not have to
1090 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. */
1095 if (s->fullname == NULL)
1097 int fd = open_source_file (s);
1103 gdb::unique_xmalloc_ptr<char> fullname;
1105 /* rewrite_source_path would be applied by find_and_open_source, we
1106 should report the pathname where GDB tried to find the file. */
1108 if (SYMTAB_DIRNAME (s) == NULL || IS_ABSOLUTE_PATH (s->filename))
1109 fullname.reset (xstrdup (s->filename));
1111 fullname.reset (concat (SYMTAB_DIRNAME (s), SLASH_STRING,
1112 s->filename, (char *) NULL));
1114 s->fullname = rewrite_source_path (fullname.get ()).release ();
1115 if (s->fullname == NULL)
1116 s->fullname = fullname.release ();
1123 /* See commentary in source.h. */
1126 symtab_to_filename_for_display (struct symtab *symtab)
1128 if (filename_display_string == filename_display_basename)
1129 return lbasename (symtab->filename);
1130 else if (filename_display_string == filename_display_absolute)
1131 return symtab_to_fullname (symtab);
1132 else if (filename_display_string == filename_display_relative)
1133 return symtab->filename;
1135 internal_error (__FILE__, __LINE__, _("invalid filename_display_string"));
1138 /* Create and initialize the table S->line_charpos that records
1139 the positions of the lines in the source file, which is assumed
1140 to be open on descriptor DESC.
1141 All set S->nlines to the number of such lines. */
1144 find_source_lines (struct symtab *s, int desc)
1149 int lines_allocated = 1000;
1155 line_charpos = XNEWVEC (int, lines_allocated);
1156 if (fstat (desc, &st) < 0)
1157 perror_with_name (symtab_to_filename_for_display (s));
1159 if (SYMTAB_OBJFILE (s) != NULL && SYMTAB_OBJFILE (s)->obfd != NULL)
1160 mtime = SYMTAB_OBJFILE (s)->mtime;
1162 mtime = exec_bfd_mtime;
1164 if (mtime && mtime < st.st_mtime)
1165 warning (_("Source file is more recent than executable."));
1168 /* st_size might be a large type, but we only support source files whose
1169 size fits in an int. */
1170 size = (int) st.st_size;
1172 /* Use the heap, not the stack, because this may be pretty large,
1173 and we may run into various kinds of limits on stack size. */
1174 gdb::def_vector<char> data (size);
1176 /* Reassign `size' to result of read for systems where \r\n -> \n. */
1177 size = myread (desc, data.data (), size);
1179 perror_with_name (symtab_to_filename_for_display (s));
1180 end = data.data () + size;
1182 line_charpos[0] = 0;
1187 /* A newline at the end does not start a new line. */
1190 if (nlines == lines_allocated)
1192 lines_allocated *= 2;
1194 (int *) xrealloc ((char *) line_charpos,
1195 sizeof (int) * lines_allocated);
1197 line_charpos[nlines++] = p - data.data ();
1204 (int *) xrealloc ((char *) line_charpos, nlines * sizeof (int));
1210 /* Get full pathname and line number positions for a symtab.
1211 Return nonzero if line numbers may have changed.
1212 Set *FULLNAME to actual name of the file as found by `openp',
1213 or to 0 if the file is not found. */
1216 get_filename_and_charpos (struct symtab *s, char **fullname)
1218 int linenums_changed = 0;
1220 scoped_fd desc (open_source_file (s));
1221 if (desc.get () < 0)
1228 *fullname = s->fullname;
1229 if (s->line_charpos == 0)
1230 linenums_changed = 1;
1231 if (linenums_changed)
1232 find_source_lines (s, desc.get ());
1233 return linenums_changed;
1236 /* Print text describing the full name of the source file S
1237 and the line number LINE and its corresponding character position.
1238 The text starts with two Ctrl-z so that the Emacs-GDB interface
1241 MID_STATEMENT is nonzero if the PC is not at the beginning of that line.
1243 Return 1 if successful, 0 if could not find the file. */
1246 identify_source_line (struct symtab *s, int line, int mid_statement,
1249 if (s->line_charpos == 0)
1250 get_filename_and_charpos (s, (char **) NULL);
1251 if (s->fullname == 0)
1253 if (line > s->nlines)
1254 /* Don't index off the end of the line_charpos array. */
1256 annotate_source (s->fullname, line, s->line_charpos[line - 1],
1257 mid_statement, get_objfile_arch (SYMTAB_OBJFILE (s)), pc);
1259 current_source_line = line;
1260 current_source_symtab = s;
1261 clear_lines_listed_range ();
1266 /* Print source lines from the file of symtab S,
1267 starting with line number LINE and stopping before line number STOPLINE. */
1270 print_source_lines_base (struct symtab *s, int line, int stopline,
1271 print_source_lines_flags flags)
1276 int nlines = stopline - line;
1277 struct ui_out *uiout = current_uiout;
1279 /* Regardless of whether we can open the file, set current_source_symtab. */
1280 current_source_symtab = s;
1281 current_source_line = line;
1282 first_line_listed = line;
1284 /* If printing of source lines is disabled, just print file and line
1286 if (uiout->test_flags (ui_source_list))
1288 /* Only prints "No such file or directory" once. */
1289 if ((s != last_source_visited) || (!last_source_error))
1291 last_source_visited = s;
1292 desc = open_source_file (s);
1296 desc = last_source_error;
1297 flags |= PRINT_SOURCE_LINES_NOERROR;
1302 desc = last_source_error;
1303 flags |= PRINT_SOURCE_LINES_NOERROR;
1307 if (desc < 0 || noprint)
1309 last_source_error = desc;
1311 if (!(flags & PRINT_SOURCE_LINES_NOERROR))
1313 const char *filename = symtab_to_filename_for_display (s);
1314 int len = strlen (filename) + 100;
1315 char *name = (char *) alloca (len);
1317 xsnprintf (name, len, "%d\t%s", line, filename);
1318 print_sys_errmsg (name, errno);
1322 uiout->field_int ("line", line);
1323 uiout->text ("\tin ");
1325 /* CLI expects only the "file" field. TUI expects only the
1326 "fullname" field (and TUI does break if "file" is printed).
1327 MI expects both fields. ui_source_list is set only for CLI,
1329 if (uiout->is_mi_like_p () || uiout->test_flags (ui_source_list))
1330 uiout->field_string ("file", symtab_to_filename_for_display (s));
1331 if (uiout->is_mi_like_p () || !uiout->test_flags (ui_source_list))
1333 const char *s_fullname = symtab_to_fullname (s);
1334 char *local_fullname;
1336 /* ui_out_field_string may free S_FULLNAME by calling
1337 open_source_file for it again. See e.g.,
1338 tui_field_string->tui_show_source. */
1339 local_fullname = (char *) alloca (strlen (s_fullname) + 1);
1340 strcpy (local_fullname, s_fullname);
1342 uiout->field_string ("fullname", local_fullname);
1351 last_source_error = 0;
1353 if (s->line_charpos == 0)
1354 find_source_lines (s, desc);
1356 if (line < 1 || line > s->nlines)
1359 error (_("Line number %d out of range; %s has %d lines."),
1360 line, symtab_to_filename_for_display (s), s->nlines);
1363 if (lseek (desc, s->line_charpos[line - 1], 0) < 0)
1366 perror_with_name (symtab_to_filename_for_display (s));
1369 gdb_file_up stream (fdopen (desc, FDOPEN_MODE));
1370 clearerr (stream.get ());
1372 while (nlines-- > 0)
1376 c = fgetc (stream.get ());
1379 last_line_listed = current_source_line;
1380 if (flags & PRINT_SOURCE_LINES_FILENAME)
1382 uiout->text (symtab_to_filename_for_display (s));
1385 xsnprintf (buf, sizeof (buf), "%d\t", current_source_line++);
1389 if (c < 040 && c != '\t' && c != '\n' && c != '\r')
1391 xsnprintf (buf, sizeof (buf), "^%c", c + 0100);
1398 /* Skip a \r character, but only before a \n. */
1399 int c1 = fgetc (stream.get ());
1402 printf_filtered ("^%c", c + 0100);
1404 ungetc (c1, stream.get ());
1408 xsnprintf (buf, sizeof (buf), "%c", c);
1412 while (c != '\n' && (c = fgetc (stream.get ())) >= 0);
1416 /* Show source lines from the file of symtab S, starting with line
1417 number LINE and stopping before line number STOPLINE. If this is
1418 not the command line version, then the source is shown in the source
1419 window otherwise it is simply printed. */
1422 print_source_lines (struct symtab *s, int line, int stopline,
1423 print_source_lines_flags flags)
1425 print_source_lines_base (s, line, stopline, flags);
1428 /* Print info on range of pc's in a specified line. */
1431 info_line_command (const char *arg, int from_tty)
1433 CORE_ADDR start_pc, end_pc;
1435 std::vector<symtab_and_line> decoded_sals;
1436 symtab_and_line curr_sal;
1437 gdb::array_view<symtab_and_line> sals;
1441 curr_sal.symtab = current_source_symtab;
1442 curr_sal.pspace = current_program_space;
1443 if (last_line_listed != 0)
1444 curr_sal.line = last_line_listed;
1446 curr_sal.line = current_source_line;
1452 decoded_sals = decode_line_with_last_displayed (arg,
1453 DECODE_LINE_LIST_MODE);
1454 sals = decoded_sals;
1459 /* C++ More than one line may have been specified, as when the user
1460 specifies an overloaded function name. Print info on them all. */
1461 for (const auto &sal : sals)
1463 if (sal.pspace != current_program_space)
1466 if (sal.symtab == 0)
1468 struct gdbarch *gdbarch = get_current_arch ();
1470 printf_filtered (_("No line number information available"));
1473 /* This is useful for "info line *0x7f34". If we can't tell the
1474 user about a source line, at least let them have the symbolic
1476 printf_filtered (" for address ");
1478 print_address (gdbarch, sal.pc, gdb_stdout);
1481 printf_filtered (".");
1482 printf_filtered ("\n");
1484 else if (sal.line > 0
1485 && find_line_pc_range (sal, &start_pc, &end_pc))
1487 struct gdbarch *gdbarch
1488 = get_objfile_arch (SYMTAB_OBJFILE (sal.symtab));
1490 if (start_pc == end_pc)
1492 printf_filtered ("Line %d of \"%s\"",
1494 symtab_to_filename_for_display (sal.symtab));
1496 printf_filtered (" is at address ");
1497 print_address (gdbarch, start_pc, gdb_stdout);
1499 printf_filtered (" but contains no code.\n");
1503 printf_filtered ("Line %d of \"%s\"",
1505 symtab_to_filename_for_display (sal.symtab));
1507 printf_filtered (" starts at address ");
1508 print_address (gdbarch, start_pc, gdb_stdout);
1510 printf_filtered (" and ends at ");
1511 print_address (gdbarch, end_pc, gdb_stdout);
1512 printf_filtered (".\n");
1515 /* x/i should display this line's code. */
1516 set_next_address (gdbarch, start_pc);
1518 /* Repeating "info line" should do the following line. */
1519 last_line_listed = sal.line + 1;
1521 /* If this is the only line, show the source code. If it could
1522 not find the file, don't do anything special. */
1523 if (annotation_level && sals.size () == 1)
1524 identify_source_line (sal.symtab, sal.line, 0, start_pc);
1527 /* Is there any case in which we get here, and have an address
1528 which the user would want to see? If we have debugging symbols
1529 and no line numbers? */
1530 printf_filtered (_("Line number %d is out of range for \"%s\".\n"),
1531 sal.line, symtab_to_filename_for_display (sal.symtab));
1535 /* Commands to search the source file for a regexp. */
1538 forward_search_command (const char *regex, int from_tty)
1544 line = last_line_listed + 1;
1546 msg = (char *) re_comp (regex);
1548 error (("%s"), msg);
1550 if (current_source_symtab == 0)
1551 select_source_symtab (0);
1553 scoped_fd desc (open_source_file (current_source_symtab));
1554 if (desc.get () < 0)
1555 perror_with_name (symtab_to_filename_for_display (current_source_symtab));
1557 if (current_source_symtab->line_charpos == 0)
1558 find_source_lines (current_source_symtab, desc.get ());
1560 if (line < 1 || line > current_source_symtab->nlines)
1561 error (_("Expression not found"));
1563 if (lseek (desc.get (), current_source_symtab->line_charpos[line - 1], 0)
1565 perror_with_name (symtab_to_filename_for_display (current_source_symtab));
1567 gdb_file_up stream (fdopen (desc.release (), FDOPEN_MODE));
1568 clearerr (stream.get ());
1571 static char *buf = NULL;
1573 int cursize, newsize;
1576 buf = (char *) xmalloc (cursize);
1579 c = fgetc (stream.get ());
1585 if (p - buf == cursize)
1587 newsize = cursize + cursize / 2;
1588 buf = (char *) xrealloc (buf, newsize);
1593 while (c != '\n' && (c = fgetc (stream.get ())) >= 0);
1595 /* Remove the \r, if any, at the end of the line, otherwise
1596 regular expressions that end with $ or \n won't work. */
1597 if (p - buf > 1 && p[-2] == '\r')
1603 /* We now have a source line in buf, null terminate and match. */
1605 if (re_exec (buf) > 0)
1608 print_source_lines (current_source_symtab, line, line + 1, 0);
1609 set_internalvar_integer (lookup_internalvar ("_"), line);
1610 current_source_line = std::max (line - lines_to_list / 2, 1);
1616 printf_filtered (_("Expression not found\n"));
1620 reverse_search_command (const char *regex, int from_tty)
1626 line = last_line_listed - 1;
1628 msg = (char *) re_comp (regex);
1630 error (("%s"), msg);
1632 if (current_source_symtab == 0)
1633 select_source_symtab (0);
1635 scoped_fd desc (open_source_file (current_source_symtab));
1636 if (desc.get () < 0)
1637 perror_with_name (symtab_to_filename_for_display (current_source_symtab));
1639 if (current_source_symtab->line_charpos == 0)
1640 find_source_lines (current_source_symtab, desc.get ());
1642 if (line < 1 || line > current_source_symtab->nlines)
1643 error (_("Expression not found"));
1645 if (lseek (desc.get (), current_source_symtab->line_charpos[line - 1], 0)
1647 perror_with_name (symtab_to_filename_for_display (current_source_symtab));
1649 gdb_file_up stream (fdopen (desc.release (), FDOPEN_MODE));
1650 clearerr (stream.get ());
1653 /* FIXME!!! We walk right off the end of buf if we get a long line!!! */
1654 char buf[4096]; /* Should be reasonable??? */
1657 c = fgetc (stream.get ());
1664 while (c != '\n' && (c = fgetc (stream.get ())) >= 0);
1666 /* Remove the \r, if any, at the end of the line, otherwise
1667 regular expressions that end with $ or \n won't work. */
1668 if (p - buf > 1 && p[-2] == '\r')
1674 /* We now have a source line in buf; null terminate and match. */
1676 if (re_exec (buf) > 0)
1679 print_source_lines (current_source_symtab, line, line + 1, 0);
1680 set_internalvar_integer (lookup_internalvar ("_"), line);
1681 current_source_line = std::max (line - lines_to_list / 2, 1);
1685 if (fseek (stream.get (),
1686 current_source_symtab->line_charpos[line - 1], 0) < 0)
1688 const char *filename;
1690 filename = symtab_to_filename_for_display (current_source_symtab);
1691 perror_with_name (filename);
1695 printf_filtered (_("Expression not found\n"));
1699 /* If the last character of PATH is a directory separator, then strip it. */
1702 strip_trailing_directory_separator (char *path)
1704 const int last = strlen (path) - 1;
1707 return; /* No stripping is needed if PATH is the empty string. */
1709 if (IS_DIR_SEPARATOR (path[last]))
1713 /* Return the path substitution rule that matches FROM.
1714 Return NULL if no rule matches. */
1716 static struct substitute_path_rule *
1717 find_substitute_path_rule (const char *from)
1719 struct substitute_path_rule *rule = substitute_path_rules;
1721 while (rule != NULL)
1723 if (FILENAME_CMP (rule->from, from) == 0)
1731 /* Add a new substitute-path rule at the end of the current list of rules.
1732 The new rule will replace FROM into TO. */
1735 add_substitute_path_rule (char *from, char *to)
1737 struct substitute_path_rule *rule;
1738 struct substitute_path_rule *new_rule = XNEW (struct substitute_path_rule);
1740 new_rule->from = xstrdup (from);
1741 new_rule->to = xstrdup (to);
1742 new_rule->next = NULL;
1744 /* If the list of rules are empty, then insert the new rule
1745 at the head of the list. */
1747 if (substitute_path_rules == NULL)
1749 substitute_path_rules = new_rule;
1753 /* Otherwise, skip to the last rule in our list and then append
1756 rule = substitute_path_rules;
1757 while (rule->next != NULL)
1760 rule->next = new_rule;
1763 /* Remove the given source path substitution rule from the current list
1764 of rules. The memory allocated for that rule is also deallocated. */
1767 delete_substitute_path_rule (struct substitute_path_rule *rule)
1769 if (rule == substitute_path_rules)
1770 substitute_path_rules = rule->next;
1773 struct substitute_path_rule *prev = substitute_path_rules;
1775 while (prev != NULL && prev->next != rule)
1778 gdb_assert (prev != NULL);
1780 prev->next = rule->next;
1788 /* Implement the "show substitute-path" command. */
1791 show_substitute_path_command (const char *args, int from_tty)
1793 struct substitute_path_rule *rule = substitute_path_rules;
1796 gdb_argv argv (args);
1798 /* We expect zero or one argument. */
1800 if (argv != NULL && argv[0] != NULL && argv[1] != NULL)
1801 error (_("Too many arguments in command"));
1803 if (argv != NULL && argv[0] != NULL)
1806 /* Print the substitution rules. */
1810 (_("Source path substitution rule matching `%s':\n"), from);
1812 printf_filtered (_("List of all source path substitution rules:\n"));
1814 while (rule != NULL)
1816 if (from == NULL || substitute_path_rule_matches (rule, from) != 0)
1817 printf_filtered (" `%s' -> `%s'.\n", rule->from, rule->to);
1822 /* Implement the "unset substitute-path" command. */
1825 unset_substitute_path_command (const char *args, int from_tty)
1827 struct substitute_path_rule *rule = substitute_path_rules;
1828 gdb_argv argv (args);
1832 /* This function takes either 0 or 1 argument. */
1834 if (argv != NULL && argv[0] != NULL && argv[1] != NULL)
1835 error (_("Incorrect usage, too many arguments in command"));
1837 if (argv != NULL && argv[0] != NULL)
1840 /* If the user asked for all the rules to be deleted, ask him
1841 to confirm and give him a chance to abort before the action
1845 && !query (_("Delete all source path substitution rules? ")))
1846 error (_("Canceled"));
1848 /* Delete the rule matching the argument. No argument means that
1849 all rules should be deleted. */
1851 while (rule != NULL)
1853 struct substitute_path_rule *next = rule->next;
1855 if (from == NULL || FILENAME_CMP (from, rule->from) == 0)
1857 delete_substitute_path_rule (rule);
1864 /* If the user asked for a specific rule to be deleted but
1865 we could not find it, then report an error. */
1867 if (from != NULL && !rule_found)
1868 error (_("No substitution rule defined for `%s'"), from);
1870 forget_cached_source_info ();
1873 /* Add a new source path substitution rule. */
1876 set_substitute_path_command (const char *args, int from_tty)
1878 struct substitute_path_rule *rule;
1880 gdb_argv argv (args);
1882 if (argv == NULL || argv[0] == NULL || argv [1] == NULL)
1883 error (_("Incorrect usage, too few arguments in command"));
1885 if (argv[2] != NULL)
1886 error (_("Incorrect usage, too many arguments in command"));
1888 if (*(argv[0]) == '\0')
1889 error (_("First argument must be at least one character long"));
1891 /* Strip any trailing directory separator character in either FROM
1892 or TO. The substitution rule already implicitly contains them. */
1893 strip_trailing_directory_separator (argv[0]);
1894 strip_trailing_directory_separator (argv[1]);
1896 /* If a rule with the same "from" was previously defined, then
1897 delete it. This new rule replaces it. */
1899 rule = find_substitute_path_rule (argv[0]);
1901 delete_substitute_path_rule (rule);
1903 /* Insert the new substitution rule. */
1905 add_substitute_path_rule (argv[0], argv[1]);
1906 forget_cached_source_info ();
1911 _initialize_source (void)
1913 struct cmd_list_element *c;
1915 current_source_symtab = 0;
1916 init_source_path ();
1918 /* The intention is to use POSIX Basic Regular Expressions.
1919 Always use the GNU regex routine for consistency across all hosts.
1920 Our current GNU regex.c does not have all the POSIX features, so this is
1921 just an approximation. */
1922 re_set_syntax (RE_SYNTAX_GREP);
1924 c = add_cmd ("directory", class_files, directory_command, _("\
1925 Add directory DIR to beginning of search path for source files.\n\
1926 Forget cached info on source file locations and line positions.\n\
1927 DIR can also be $cwd for the current working directory, or $cdir for the\n\
1928 directory in which the source file was compiled into object code.\n\
1929 With no argument, reset the search path to $cdir:$cwd, the default."),
1933 add_com_alias ("use", "directory", class_files, 0);
1935 set_cmd_completer (c, filename_completer);
1937 add_setshow_optional_filename_cmd ("directories",
1941 Set the search path for finding source files."),
1943 Show the search path for finding source files."),
1945 $cwd in the path means the current working directory.\n\
1946 $cdir in the path means the compilation directory of the source file.\n\
1947 GDB ensures the search path always ends with $cdir:$cwd by\n\
1948 appending these directories if necessary.\n\
1949 Setting the value to an empty string sets it to $cdir:$cwd, the default."),
1950 set_directories_command,
1951 show_directories_command,
1952 &setlist, &showlist);
1954 add_info ("source", info_source_command,
1955 _("Information about the current source file."));
1957 add_info ("line", info_line_command, _("\
1958 Core addresses of the code for a source line.\n\
1959 Line can be specified as\n\
1960 LINENUM, to list around that line in current file,\n\
1961 FILE:LINENUM, to list around that line in that file,\n\
1962 FUNCTION, to list around beginning of that function,\n\
1963 FILE:FUNCTION, to distinguish among like-named static functions.\n\
1964 Default is to describe the last source line that was listed.\n\n\
1965 This sets the default address for \"x\" to the line's first instruction\n\
1966 so that \"x/i\" suffices to start examining the machine code.\n\
1967 The address is also stored as the value of \"$_\"."));
1969 add_com ("forward-search", class_files, forward_search_command, _("\
1970 Search for regular expression (see regex(3)) from last line listed.\n\
1971 The matching line number is also stored as the value of \"$_\"."));
1972 add_com_alias ("search", "forward-search", class_files, 0);
1973 add_com_alias ("fo", "forward-search", class_files, 1);
1975 add_com ("reverse-search", class_files, reverse_search_command, _("\
1976 Search backward for regular expression (see regex(3)) from last line listed.\n\
1977 The matching line number is also stored as the value of \"$_\"."));
1978 add_com_alias ("rev", "reverse-search", class_files, 1);
1980 add_setshow_integer_cmd ("listsize", class_support, &lines_to_list, _("\
1981 Set number of source lines gdb will list by default."), _("\
1982 Show number of source lines gdb will list by default."), _("\
1983 Use this to choose how many source lines the \"list\" displays (unless\n\
1984 the \"list\" argument explicitly specifies some other number).\n\
1985 A value of \"unlimited\", or zero, means there's no limit."),
1988 &setlist, &showlist);
1990 add_cmd ("substitute-path", class_files, set_substitute_path_command,
1992 Usage: set substitute-path FROM TO\n\
1993 Add a substitution rule replacing FROM into TO in source file names.\n\
1994 If a substitution rule was previously set for FROM, the old rule\n\
1995 is replaced by the new one."),
1998 add_cmd ("substitute-path", class_files, unset_substitute_path_command,
2000 Usage: unset substitute-path [FROM]\n\
2001 Delete the rule for substituting FROM in source file names. If FROM\n\
2002 is not specified, all substituting rules are deleted.\n\
2003 If the debugger cannot find a rule for FROM, it will display a warning."),
2006 add_cmd ("substitute-path", class_files, show_substitute_path_command,
2008 Usage: show substitute-path [FROM]\n\
2009 Print the rule for substituting FROM in source file names. If FROM\n\
2010 is not specified, print all substitution rules."),
2013 add_setshow_enum_cmd ("filename-display", class_files,
2014 filename_display_kind_names,
2015 &filename_display_string, _("\
2016 Set how to display filenames."), _("\
2017 Show how to display filenames."), _("\
2018 filename-display can be:\n\
2019 basename - display only basename of a filename\n\
2020 relative - display a filename relative to the compilation directory\n\
2021 absolute - display an absolute filename\n\
2022 By default, relative filenames are displayed."),
2024 show_filename_display_string,
2025 &setlist, &showlist);