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;
1074 int fd = find_and_open_source (s->filename, SYMTAB_DIRNAME (s), &fullname);
1075 s->fullname = fullname.release ();
1079 /* Finds the fullname that a symtab represents.
1081 This functions finds the fullname and saves it in s->fullname.
1082 It will also return the value.
1084 If this function fails to find the file that this symtab represents,
1085 the expected fullname is used. Therefore the files does not have to
1089 symtab_to_fullname (struct symtab *s)
1091 /* Use cached copy if we have it.
1092 We rely on forget_cached_source_info being called appropriately
1093 to handle cases like the file being moved. */
1094 if (s->fullname == NULL)
1096 int fd = open_source_file (s);
1102 gdb::unique_xmalloc_ptr<char> fullname;
1104 /* rewrite_source_path would be applied by find_and_open_source, we
1105 should report the pathname where GDB tried to find the file. */
1107 if (SYMTAB_DIRNAME (s) == NULL || IS_ABSOLUTE_PATH (s->filename))
1108 fullname.reset (xstrdup (s->filename));
1110 fullname.reset (concat (SYMTAB_DIRNAME (s), SLASH_STRING,
1111 s->filename, (char *) NULL));
1113 s->fullname = rewrite_source_path (fullname.get ()).release ();
1114 if (s->fullname == NULL)
1115 s->fullname = fullname.release ();
1122 /* See commentary in source.h. */
1125 symtab_to_filename_for_display (struct symtab *symtab)
1127 if (filename_display_string == filename_display_basename)
1128 return lbasename (symtab->filename);
1129 else if (filename_display_string == filename_display_absolute)
1130 return symtab_to_fullname (symtab);
1131 else if (filename_display_string == filename_display_relative)
1132 return symtab->filename;
1134 internal_error (__FILE__, __LINE__, _("invalid filename_display_string"));
1137 /* Create and initialize the table S->line_charpos that records
1138 the positions of the lines in the source file, which is assumed
1139 to be open on descriptor DESC.
1140 All set S->nlines to the number of such lines. */
1143 find_source_lines (struct symtab *s, int desc)
1148 int lines_allocated = 1000;
1154 line_charpos = XNEWVEC (int, lines_allocated);
1155 if (fstat (desc, &st) < 0)
1156 perror_with_name (symtab_to_filename_for_display (s));
1158 if (SYMTAB_OBJFILE (s) != NULL && SYMTAB_OBJFILE (s)->obfd != NULL)
1159 mtime = SYMTAB_OBJFILE (s)->mtime;
1161 mtime = exec_bfd_mtime;
1163 if (mtime && mtime < st.st_mtime)
1164 warning (_("Source file is more recent than executable."));
1167 /* st_size might be a large type, but we only support source files whose
1168 size fits in an int. */
1169 size = (int) st.st_size;
1171 /* Use the heap, not the stack, because this may be pretty large,
1172 and we may run into various kinds of limits on stack size. */
1173 gdb::def_vector<char> data (size);
1175 /* Reassign `size' to result of read for systems where \r\n -> \n. */
1176 size = myread (desc, data.data (), size);
1178 perror_with_name (symtab_to_filename_for_display (s));
1179 end = data.data () + size;
1181 line_charpos[0] = 0;
1186 /* A newline at the end does not start a new line. */
1189 if (nlines == lines_allocated)
1191 lines_allocated *= 2;
1193 (int *) xrealloc ((char *) line_charpos,
1194 sizeof (int) * lines_allocated);
1196 line_charpos[nlines++] = p - data.data ();
1203 (int *) xrealloc ((char *) line_charpos, nlines * sizeof (int));
1209 /* Get full pathname and line number positions for a symtab.
1210 Return nonzero if line numbers may have changed.
1211 Set *FULLNAME to actual name of the file as found by `openp',
1212 or to 0 if the file is not found. */
1215 get_filename_and_charpos (struct symtab *s, char **fullname)
1217 int linenums_changed = 0;
1219 scoped_fd desc (open_source_file (s));
1220 if (desc.get () < 0)
1227 *fullname = s->fullname;
1228 if (s->line_charpos == 0)
1229 linenums_changed = 1;
1230 if (linenums_changed)
1231 find_source_lines (s, desc.get ());
1232 return linenums_changed;
1235 /* Print text describing the full name of the source file S
1236 and the line number LINE and its corresponding character position.
1237 The text starts with two Ctrl-z so that the Emacs-GDB interface
1240 MID_STATEMENT is nonzero if the PC is not at the beginning of that line.
1242 Return 1 if successful, 0 if could not find the file. */
1245 identify_source_line (struct symtab *s, int line, int mid_statement,
1248 if (s->line_charpos == 0)
1249 get_filename_and_charpos (s, (char **) NULL);
1250 if (s->fullname == 0)
1252 if (line > s->nlines)
1253 /* Don't index off the end of the line_charpos array. */
1255 annotate_source (s->fullname, line, s->line_charpos[line - 1],
1256 mid_statement, get_objfile_arch (SYMTAB_OBJFILE (s)), pc);
1258 current_source_line = line;
1259 current_source_symtab = s;
1260 clear_lines_listed_range ();
1265 /* Print source lines from the file of symtab S,
1266 starting with line number LINE and stopping before line number STOPLINE. */
1269 print_source_lines_base (struct symtab *s, int line, int stopline,
1270 print_source_lines_flags flags)
1275 int nlines = stopline - line;
1276 struct ui_out *uiout = current_uiout;
1278 /* Regardless of whether we can open the file, set current_source_symtab. */
1279 current_source_symtab = s;
1280 current_source_line = line;
1281 first_line_listed = line;
1283 /* If printing of source lines is disabled, just print file and line
1285 if (uiout->test_flags (ui_source_list))
1287 /* Only prints "No such file or directory" once. */
1288 if ((s != last_source_visited) || (!last_source_error))
1290 last_source_visited = s;
1291 desc = open_source_file (s);
1295 desc = last_source_error;
1296 flags |= PRINT_SOURCE_LINES_NOERROR;
1301 desc = last_source_error;
1302 flags |= PRINT_SOURCE_LINES_NOERROR;
1306 if (desc < 0 || noprint)
1308 last_source_error = desc;
1310 if (!(flags & PRINT_SOURCE_LINES_NOERROR))
1312 const char *filename = symtab_to_filename_for_display (s);
1313 int len = strlen (filename) + 100;
1314 char *name = (char *) alloca (len);
1316 xsnprintf (name, len, "%d\t%s", line, filename);
1317 print_sys_errmsg (name, errno);
1321 uiout->field_int ("line", line);
1322 uiout->text ("\tin ");
1324 /* CLI expects only the "file" field. TUI expects only the
1325 "fullname" field (and TUI does break if "file" is printed).
1326 MI expects both fields. ui_source_list is set only for CLI,
1328 if (uiout->is_mi_like_p () || uiout->test_flags (ui_source_list))
1329 uiout->field_string ("file", symtab_to_filename_for_display (s));
1330 if (uiout->is_mi_like_p () || !uiout->test_flags (ui_source_list))
1332 const char *s_fullname = symtab_to_fullname (s);
1333 char *local_fullname;
1335 /* ui_out_field_string may free S_FULLNAME by calling
1336 open_source_file for it again. See e.g.,
1337 tui_field_string->tui_show_source. */
1338 local_fullname = (char *) alloca (strlen (s_fullname) + 1);
1339 strcpy (local_fullname, s_fullname);
1341 uiout->field_string ("fullname", local_fullname);
1350 last_source_error = 0;
1352 if (s->line_charpos == 0)
1353 find_source_lines (s, desc);
1355 if (line < 1 || line > s->nlines)
1358 error (_("Line number %d out of range; %s has %d lines."),
1359 line, symtab_to_filename_for_display (s), s->nlines);
1362 if (lseek (desc, s->line_charpos[line - 1], 0) < 0)
1365 perror_with_name (symtab_to_filename_for_display (s));
1368 gdb_file_up stream (fdopen (desc, FDOPEN_MODE));
1369 clearerr (stream.get ());
1371 while (nlines-- > 0)
1375 c = fgetc (stream.get ());
1378 last_line_listed = current_source_line;
1379 if (flags & PRINT_SOURCE_LINES_FILENAME)
1381 uiout->text (symtab_to_filename_for_display (s));
1384 xsnprintf (buf, sizeof (buf), "%d\t", current_source_line++);
1388 if (c < 040 && c != '\t' && c != '\n' && c != '\r')
1390 xsnprintf (buf, sizeof (buf), "^%c", c + 0100);
1397 /* Skip a \r character, but only before a \n. */
1398 int c1 = fgetc (stream.get ());
1401 printf_filtered ("^%c", c + 0100);
1403 ungetc (c1, stream.get ());
1407 xsnprintf (buf, sizeof (buf), "%c", c);
1411 while (c != '\n' && (c = fgetc (stream.get ())) >= 0);
1415 /* Show source lines from the file of symtab S, starting with line
1416 number LINE and stopping before line number STOPLINE. If this is
1417 not the command line version, then the source is shown in the source
1418 window otherwise it is simply printed. */
1421 print_source_lines (struct symtab *s, int line, int stopline,
1422 print_source_lines_flags flags)
1424 print_source_lines_base (s, line, stopline, flags);
1427 /* Print info on range of pc's in a specified line. */
1430 info_line_command (const char *arg, int from_tty)
1432 CORE_ADDR start_pc, end_pc;
1434 std::vector<symtab_and_line> decoded_sals;
1435 symtab_and_line curr_sal;
1436 gdb::array_view<symtab_and_line> sals;
1440 curr_sal.symtab = current_source_symtab;
1441 curr_sal.pspace = current_program_space;
1442 if (last_line_listed != 0)
1443 curr_sal.line = last_line_listed;
1445 curr_sal.line = current_source_line;
1451 decoded_sals = decode_line_with_last_displayed (arg,
1452 DECODE_LINE_LIST_MODE);
1453 sals = decoded_sals;
1458 /* C++ More than one line may have been specified, as when the user
1459 specifies an overloaded function name. Print info on them all. */
1460 for (const auto &sal : sals)
1462 if (sal.pspace != current_program_space)
1465 if (sal.symtab == 0)
1467 struct gdbarch *gdbarch = get_current_arch ();
1469 printf_filtered (_("No line number information available"));
1472 /* This is useful for "info line *0x7f34". If we can't tell the
1473 user about a source line, at least let them have the symbolic
1475 printf_filtered (" for address ");
1477 print_address (gdbarch, sal.pc, gdb_stdout);
1480 printf_filtered (".");
1481 printf_filtered ("\n");
1483 else if (sal.line > 0
1484 && find_line_pc_range (sal, &start_pc, &end_pc))
1486 struct gdbarch *gdbarch
1487 = get_objfile_arch (SYMTAB_OBJFILE (sal.symtab));
1489 if (start_pc == end_pc)
1491 printf_filtered ("Line %d of \"%s\"",
1493 symtab_to_filename_for_display (sal.symtab));
1495 printf_filtered (" is at address ");
1496 print_address (gdbarch, start_pc, gdb_stdout);
1498 printf_filtered (" but contains no code.\n");
1502 printf_filtered ("Line %d of \"%s\"",
1504 symtab_to_filename_for_display (sal.symtab));
1506 printf_filtered (" starts at address ");
1507 print_address (gdbarch, start_pc, gdb_stdout);
1509 printf_filtered (" and ends at ");
1510 print_address (gdbarch, end_pc, gdb_stdout);
1511 printf_filtered (".\n");
1514 /* x/i should display this line's code. */
1515 set_next_address (gdbarch, start_pc);
1517 /* Repeating "info line" should do the following line. */
1518 last_line_listed = sal.line + 1;
1520 /* If this is the only line, show the source code. If it could
1521 not find the file, don't do anything special. */
1522 if (annotation_level && sals.size () == 1)
1523 identify_source_line (sal.symtab, sal.line, 0, start_pc);
1526 /* Is there any case in which we get here, and have an address
1527 which the user would want to see? If we have debugging symbols
1528 and no line numbers? */
1529 printf_filtered (_("Line number %d is out of range for \"%s\".\n"),
1530 sal.line, symtab_to_filename_for_display (sal.symtab));
1534 /* Commands to search the source file for a regexp. */
1537 forward_search_command (const char *regex, int from_tty)
1543 line = last_line_listed + 1;
1545 msg = (char *) re_comp (regex);
1547 error (("%s"), msg);
1549 if (current_source_symtab == 0)
1550 select_source_symtab (0);
1552 scoped_fd desc (open_source_file (current_source_symtab));
1553 if (desc.get () < 0)
1554 perror_with_name (symtab_to_filename_for_display (current_source_symtab));
1556 if (current_source_symtab->line_charpos == 0)
1557 find_source_lines (current_source_symtab, desc.get ());
1559 if (line < 1 || line > current_source_symtab->nlines)
1560 error (_("Expression not found"));
1562 if (lseek (desc.get (), current_source_symtab->line_charpos[line - 1], 0)
1564 perror_with_name (symtab_to_filename_for_display (current_source_symtab));
1566 gdb_file_up stream (fdopen (desc.release (), FDOPEN_MODE));
1567 clearerr (stream.get ());
1570 static char *buf = NULL;
1572 int cursize, newsize;
1575 buf = (char *) xmalloc (cursize);
1578 c = fgetc (stream.get ());
1584 if (p - buf == cursize)
1586 newsize = cursize + cursize / 2;
1587 buf = (char *) xrealloc (buf, newsize);
1592 while (c != '\n' && (c = fgetc (stream.get ())) >= 0);
1594 /* Remove the \r, if any, at the end of the line, otherwise
1595 regular expressions that end with $ or \n won't work. */
1596 if (p - buf > 1 && p[-2] == '\r')
1602 /* We now have a source line in buf, null terminate and match. */
1604 if (re_exec (buf) > 0)
1607 print_source_lines (current_source_symtab, line, line + 1, 0);
1608 set_internalvar_integer (lookup_internalvar ("_"), line);
1609 current_source_line = std::max (line - lines_to_list / 2, 1);
1615 printf_filtered (_("Expression not found\n"));
1619 reverse_search_command (const char *regex, int from_tty)
1625 line = last_line_listed - 1;
1627 msg = (char *) re_comp (regex);
1629 error (("%s"), msg);
1631 if (current_source_symtab == 0)
1632 select_source_symtab (0);
1634 scoped_fd desc (open_source_file (current_source_symtab));
1635 if (desc.get () < 0)
1636 perror_with_name (symtab_to_filename_for_display (current_source_symtab));
1638 if (current_source_symtab->line_charpos == 0)
1639 find_source_lines (current_source_symtab, desc.get ());
1641 if (line < 1 || line > current_source_symtab->nlines)
1642 error (_("Expression not found"));
1644 if (lseek (desc.get (), current_source_symtab->line_charpos[line - 1], 0)
1646 perror_with_name (symtab_to_filename_for_display (current_source_symtab));
1648 gdb_file_up stream (fdopen (desc.release (), FDOPEN_MODE));
1649 clearerr (stream.get ());
1652 /* FIXME!!! We walk right off the end of buf if we get a long line!!! */
1653 char buf[4096]; /* Should be reasonable??? */
1656 c = fgetc (stream.get ());
1663 while (c != '\n' && (c = fgetc (stream.get ())) >= 0);
1665 /* Remove the \r, if any, at the end of the line, otherwise
1666 regular expressions that end with $ or \n won't work. */
1667 if (p - buf > 1 && p[-2] == '\r')
1673 /* We now have a source line in buf; null terminate and match. */
1675 if (re_exec (buf) > 0)
1678 print_source_lines (current_source_symtab, line, line + 1, 0);
1679 set_internalvar_integer (lookup_internalvar ("_"), line);
1680 current_source_line = std::max (line - lines_to_list / 2, 1);
1684 if (fseek (stream.get (),
1685 current_source_symtab->line_charpos[line - 1], 0) < 0)
1687 const char *filename;
1689 filename = symtab_to_filename_for_display (current_source_symtab);
1690 perror_with_name (filename);
1694 printf_filtered (_("Expression not found\n"));
1698 /* If the last character of PATH is a directory separator, then strip it. */
1701 strip_trailing_directory_separator (char *path)
1703 const int last = strlen (path) - 1;
1706 return; /* No stripping is needed if PATH is the empty string. */
1708 if (IS_DIR_SEPARATOR (path[last]))
1712 /* Return the path substitution rule that matches FROM.
1713 Return NULL if no rule matches. */
1715 static struct substitute_path_rule *
1716 find_substitute_path_rule (const char *from)
1718 struct substitute_path_rule *rule = substitute_path_rules;
1720 while (rule != NULL)
1722 if (FILENAME_CMP (rule->from, from) == 0)
1730 /* Add a new substitute-path rule at the end of the current list of rules.
1731 The new rule will replace FROM into TO. */
1734 add_substitute_path_rule (char *from, char *to)
1736 struct substitute_path_rule *rule;
1737 struct substitute_path_rule *new_rule = XNEW (struct substitute_path_rule);
1739 new_rule->from = xstrdup (from);
1740 new_rule->to = xstrdup (to);
1741 new_rule->next = NULL;
1743 /* If the list of rules are empty, then insert the new rule
1744 at the head of the list. */
1746 if (substitute_path_rules == NULL)
1748 substitute_path_rules = new_rule;
1752 /* Otherwise, skip to the last rule in our list and then append
1755 rule = substitute_path_rules;
1756 while (rule->next != NULL)
1759 rule->next = new_rule;
1762 /* Remove the given source path substitution rule from the current list
1763 of rules. The memory allocated for that rule is also deallocated. */
1766 delete_substitute_path_rule (struct substitute_path_rule *rule)
1768 if (rule == substitute_path_rules)
1769 substitute_path_rules = rule->next;
1772 struct substitute_path_rule *prev = substitute_path_rules;
1774 while (prev != NULL && prev->next != rule)
1777 gdb_assert (prev != NULL);
1779 prev->next = rule->next;
1787 /* Implement the "show substitute-path" command. */
1790 show_substitute_path_command (const char *args, int from_tty)
1792 struct substitute_path_rule *rule = substitute_path_rules;
1795 gdb_argv argv (args);
1797 /* We expect zero or one argument. */
1799 if (argv != NULL && argv[0] != NULL && argv[1] != NULL)
1800 error (_("Too many arguments in command"));
1802 if (argv != NULL && argv[0] != NULL)
1805 /* Print the substitution rules. */
1809 (_("Source path substitution rule matching `%s':\n"), from);
1811 printf_filtered (_("List of all source path substitution rules:\n"));
1813 while (rule != NULL)
1815 if (from == NULL || substitute_path_rule_matches (rule, from) != 0)
1816 printf_filtered (" `%s' -> `%s'.\n", rule->from, rule->to);
1821 /* Implement the "unset substitute-path" command. */
1824 unset_substitute_path_command (const char *args, int from_tty)
1826 struct substitute_path_rule *rule = substitute_path_rules;
1827 gdb_argv argv (args);
1831 /* This function takes either 0 or 1 argument. */
1833 if (argv != NULL && argv[0] != NULL && argv[1] != NULL)
1834 error (_("Incorrect usage, too many arguments in command"));
1836 if (argv != NULL && argv[0] != NULL)
1839 /* If the user asked for all the rules to be deleted, ask him
1840 to confirm and give him a chance to abort before the action
1844 && !query (_("Delete all source path substitution rules? ")))
1845 error (_("Canceled"));
1847 /* Delete the rule matching the argument. No argument means that
1848 all rules should be deleted. */
1850 while (rule != NULL)
1852 struct substitute_path_rule *next = rule->next;
1854 if (from == NULL || FILENAME_CMP (from, rule->from) == 0)
1856 delete_substitute_path_rule (rule);
1863 /* If the user asked for a specific rule to be deleted but
1864 we could not find it, then report an error. */
1866 if (from != NULL && !rule_found)
1867 error (_("No substitution rule defined for `%s'"), from);
1869 forget_cached_source_info ();
1872 /* Add a new source path substitution rule. */
1875 set_substitute_path_command (const char *args, int from_tty)
1877 struct substitute_path_rule *rule;
1879 gdb_argv argv (args);
1881 if (argv == NULL || argv[0] == NULL || argv [1] == NULL)
1882 error (_("Incorrect usage, too few arguments in command"));
1884 if (argv[2] != NULL)
1885 error (_("Incorrect usage, too many arguments in command"));
1887 if (*(argv[0]) == '\0')
1888 error (_("First argument must be at least one character long"));
1890 /* Strip any trailing directory separator character in either FROM
1891 or TO. The substitution rule already implicitly contains them. */
1892 strip_trailing_directory_separator (argv[0]);
1893 strip_trailing_directory_separator (argv[1]);
1895 /* If a rule with the same "from" was previously defined, then
1896 delete it. This new rule replaces it. */
1898 rule = find_substitute_path_rule (argv[0]);
1900 delete_substitute_path_rule (rule);
1902 /* Insert the new substitution rule. */
1904 add_substitute_path_rule (argv[0], argv[1]);
1905 forget_cached_source_info ();
1910 _initialize_source (void)
1912 struct cmd_list_element *c;
1914 current_source_symtab = 0;
1915 init_source_path ();
1917 /* The intention is to use POSIX Basic Regular Expressions.
1918 Always use the GNU regex routine for consistency across all hosts.
1919 Our current GNU regex.c does not have all the POSIX features, so this is
1920 just an approximation. */
1921 re_set_syntax (RE_SYNTAX_GREP);
1923 c = add_cmd ("directory", class_files, directory_command, _("\
1924 Add directory DIR to beginning of search path for source files.\n\
1925 Forget cached info on source file locations and line positions.\n\
1926 DIR can also be $cwd for the current working directory, or $cdir for the\n\
1927 directory in which the source file was compiled into object code.\n\
1928 With no argument, reset the search path to $cdir:$cwd, the default."),
1932 add_com_alias ("use", "directory", class_files, 0);
1934 set_cmd_completer (c, filename_completer);
1936 add_setshow_optional_filename_cmd ("directories",
1940 Set the search path for finding source files."),
1942 Show the search path for finding source files."),
1944 $cwd in the path means the current working directory.\n\
1945 $cdir in the path means the compilation directory of the source file.\n\
1946 GDB ensures the search path always ends with $cdir:$cwd by\n\
1947 appending these directories if necessary.\n\
1948 Setting the value to an empty string sets it to $cdir:$cwd, the default."),
1949 set_directories_command,
1950 show_directories_command,
1951 &setlist, &showlist);
1953 add_info ("source", info_source_command,
1954 _("Information about the current source file."));
1956 add_info ("line", info_line_command, _("\
1957 Core addresses of the code for a source line.\n\
1958 Line can be specified as\n\
1959 LINENUM, to list around that line in current file,\n\
1960 FILE:LINENUM, to list around that line in that file,\n\
1961 FUNCTION, to list around beginning of that function,\n\
1962 FILE:FUNCTION, to distinguish among like-named static functions.\n\
1963 Default is to describe the last source line that was listed.\n\n\
1964 This sets the default address for \"x\" to the line's first instruction\n\
1965 so that \"x/i\" suffices to start examining the machine code.\n\
1966 The address is also stored as the value of \"$_\"."));
1968 add_com ("forward-search", class_files, forward_search_command, _("\
1969 Search for regular expression (see regex(3)) from last line listed.\n\
1970 The matching line number is also stored as the value of \"$_\"."));
1971 add_com_alias ("search", "forward-search", class_files, 0);
1972 add_com_alias ("fo", "forward-search", class_files, 1);
1974 add_com ("reverse-search", class_files, reverse_search_command, _("\
1975 Search backward for regular expression (see regex(3)) from last line listed.\n\
1976 The matching line number is also stored as the value of \"$_\"."));
1977 add_com_alias ("rev", "reverse-search", class_files, 1);
1979 add_setshow_integer_cmd ("listsize", class_support, &lines_to_list, _("\
1980 Set number of source lines gdb will list by default."), _("\
1981 Show number of source lines gdb will list by default."), _("\
1982 Use this to choose how many source lines the \"list\" displays (unless\n\
1983 the \"list\" argument explicitly specifies some other number).\n\
1984 A value of \"unlimited\", or zero, means there's no limit."),
1987 &setlist, &showlist);
1989 add_cmd ("substitute-path", class_files, set_substitute_path_command,
1991 Usage: set substitute-path FROM TO\n\
1992 Add a substitution rule replacing FROM into TO in source file names.\n\
1993 If a substitution rule was previously set for FROM, the old rule\n\
1994 is replaced by the new one."),
1997 add_cmd ("substitute-path", class_files, unset_substitute_path_command,
1999 Usage: unset substitute-path [FROM]\n\
2000 Delete the rule for substituting FROM in source file names. If FROM\n\
2001 is not specified, all substituting rules are deleted.\n\
2002 If the debugger cannot find a rule for FROM, it will display a warning."),
2005 add_cmd ("substitute-path", class_files, show_substitute_path_command,
2007 Usage: show substitute-path [FROM]\n\
2008 Print the rule for substituting FROM in source file names. If FROM\n\
2009 is not specified, print all substitution rules."),
2012 add_setshow_enum_cmd ("filename-display", class_files,
2013 filename_display_kind_names,
2014 &filename_display_string, _("\
2015 Set how to display filenames."), _("\
2016 Show how to display filenames."), _("\
2017 filename-display can be:\n\
2018 basename - display only basename of a filename\n\
2019 relative - display a filename relative to the compilation directory\n\
2020 absolute - display an absolute filename\n\
2021 By default, relative filenames are displayed."),
2023 show_filename_display_string,
2024 &setlist, &showlist);