/* List lines of source files for GDB, the GNU debugger.
- Copyright (C) 1986-2013 Free Software Foundation, Inc.
+ Copyright (C) 1986-2019 Free Software Foundation, Inc.
This file is part of GDB.
#include "gdbcmd.h"
#include "frame.h"
#include "value.h"
-#include "gdb_assert.h"
+#include "filestuff.h"
#include <sys/types.h>
-#include "gdb_string.h"
-#include "gdb_stat.h"
#include <fcntl.h>
#include "gdbcore.h"
#include "gdb_regex.h"
#include "completer.h"
#include "ui-out.h"
#include "readline/readline.h"
-
-#include "psymtab.h"
-
+#include "common/enum-flags.h"
+#include "common/scoped_fd.h"
+#include <algorithm>
+#include "common/pathstuff.h"
+#include "source-cache.h"
#define OPEN_MODE (O_RDONLY | O_BINARY)
#define FDOPEN_MODE FOPEN_RB
-/* Prototypes for exported functions. */
-
-void _initialize_source (void);
-
-/* Prototypes for local functions. */
-
-static int get_filename_and_charpos (struct symtab *, char **);
-
-static void reverse_search_command (char *, int);
-
-static void forward_search_command (char *, int);
-
-static void line_info (char *, int);
-
-static void source_info (char *, int);
-
/* Path of directories to search for source files.
Same format as the PATH environment variable's value. */
and friends should be rewritten to count characters and see where
things are wrapping, but that would be a fair amount of work. */
-int lines_to_list = 10;
+static int lines_to_list = 10;
static void
show_lines_to_list (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
static int last_line_listed;
-/* First line number listed by last listing command. */
+/* First line number listed by last listing command. If 0, then no
+ source lines have yet been listed since the last time the current
+ source line was changed. */
static int first_line_listed;
return first_line_listed;
}
+/* Clear line listed range. This makes the next "list" center the
+ printed source lines around the current source line. */
+
+static void
+clear_lines_listed_range (void)
+{
+ first_line_listed = 0;
+ last_line_listed = 0;
+}
+
/* Return the default number of lines to print with commands like the
cli "list". The caller of print_source_lines must use this to
calculate the end line and use it in the call to print_source_lines
struct symtab_and_line
get_current_source_symtab_and_line (void)
{
- struct symtab_and_line cursal = { 0 };
+ symtab_and_line cursal;
cursal.pspace = current_source_pspace;
cursal.symtab = current_source_symtab;
NOTE: The returned sal pc and end fields are not valid. */
struct symtab_and_line
-set_current_source_symtab_and_line (const struct symtab_and_line *sal)
+set_current_source_symtab_and_line (const symtab_and_line &sal)
{
- struct symtab_and_line cursal = { 0 };
+ symtab_and_line cursal;
cursal.pspace = current_source_pspace;
cursal.symtab = current_source_symtab;
cursal.pc = 0;
cursal.end = 0;
- current_source_pspace = sal->pspace;
- current_source_symtab = sal->symtab;
- current_source_line = sal->line;
+ current_source_pspace = sal.pspace;
+ current_source_symtab = sal.symtab;
+ current_source_line = sal.line;
+
+ /* Force the next "list" to center around the current line. */
+ clear_lines_listed_range ();
return cursal;
}
current_source_line = 0;
}
-/* Set the source file default for the "list" command to be S.
-
- If S is NULL, and we don't have a default, find one. This
- should only be called when the user actually tries to use the
- default, since we produce an error if we can't find a reasonable
- default. Also, since this can cause symbols to be read, doing it
- before we need to would make things slower than necessary. */
+/* See source.h. */
void
select_source_symtab (struct symtab *s)
{
- struct symtabs_and_lines sals;
- struct symtab_and_line sal;
struct objfile *ofp;
+ struct compunit_symtab *cu;
if (s)
{
/* Make the default place to list be the function `main'
if one exists. */
- if (lookup_symbol (main_name (), 0, VAR_DOMAIN, 0))
+ if (lookup_symbol (main_name (), 0, VAR_DOMAIN, 0).symbol)
{
- sals = decode_line_with_current_source (main_name (),
- DECODE_LINE_FUNFIRSTLINE);
- sal = sals.sals[0];
- xfree (sals.sals);
+ std::vector<symtab_and_line> sals
+ = decode_line_with_current_source (main_name (),
+ DECODE_LINE_FUNFIRSTLINE);
+ const symtab_and_line &sal = sals[0];
current_source_pspace = sal.pspace;
current_source_symtab = sal.symtab;
- current_source_line = max (sal.line - (lines_to_list - 1), 1);
+ current_source_line = std::max (sal.line - (lines_to_list - 1), 1);
if (current_source_symtab)
return;
}
current_source_line = 1;
- ALL_OBJFILES (ofp)
+ ALL_FILETABS (ofp, cu, s)
{
- for (s = ofp->symtabs; s; s = s->next)
- {
- const char *name = s->filename;
- int len = strlen (name);
+ const char *name = s->filename;
+ int len = strlen (name);
- if (!(len > 2 && (strcmp (&name[len - 2], ".h") == 0
- || strcmp (name, "<<C++-namespaces>>") == 0)))
- {
- current_source_pspace = current_program_space;
- current_source_symtab = s;
- }
+ if (!(len > 2 && (strcmp (&name[len - 2], ".h") == 0
+ || strcmp (name, "<<C++-namespaces>>") == 0)))
+ {
+ current_source_pspace = current_program_space;
+ current_source_symtab = s;
}
}
if (current_source_symtab)
return;
- ALL_OBJFILES (ofp)
- {
- if (ofp->sf)
- s = ofp->sf->qf->find_last_source_symtab (ofp);
- if (s)
- current_source_symtab = s;
- }
+ for (objfile *objfile : all_objfiles (current_program_space))
+ {
+ if (objfile->sf)
+ s = objfile->sf->qf->find_last_source_symtab (objfile);
+ if (s)
+ current_source_symtab = s;
+ }
if (current_source_symtab)
return;
path list. The theory is that set(show(dir)) should be a no-op. */
static void
-set_directories_command (char *args, int from_tty, struct cmd_list_element *c)
+set_directories_command (const char *args,
+ int from_tty, struct cmd_list_element *c)
{
/* This is the value that was set.
It needs to be processed to maintain $cdir:$cwd and remove dups. */
show_directories_1 (NULL, from_tty);
}
-/* Forget line positions and file names for the symtabs in a
- particular objfile. */
+/* See source.h. */
void
forget_cached_source_info_for_objfile (struct objfile *objfile)
{
+ struct compunit_symtab *cu;
struct symtab *s;
- ALL_OBJFILE_SYMTABS (objfile, s)
+ ALL_OBJFILE_FILETABS (objfile, cu, s)
{
if (s->line_charpos != NULL)
{
objfile->sf->qf->forget_cached_source_info (objfile);
}
-/* Forget what we learned about line positions in source files, and
- which directories contain them; must check again now since files
- may be found in a different directory now. */
+/* See source.h. */
void
forget_cached_source_info (void)
{
struct program_space *pspace;
- struct objfile *objfile;
ALL_PSPACES (pspace)
- ALL_PSPACE_OBJFILES (pspace, objfile)
- {
- forget_cached_source_info_for_objfile (objfile);
- }
+ for (objfile *objfile : all_objfiles (pspace))
+ {
+ forget_cached_source_info_for_objfile (objfile);
+ }
+ g_source_cache.clear ();
last_source_visited = NULL;
}
/* Add zero or more directories to the front of the source path. */
static void
-directory_command (char *dirname, int from_tty)
+directory_command (const char *dirname, int from_tty)
{
dont_repeat ();
/* FIXME, this goes to "delete dir"... */
This will not be quoted so we must not treat spaces as separators. */
void
-directory_switch (char *dirname, int from_tty)
+directory_switch (const char *dirname, int from_tty)
{
add_path (dirname, &source_path, 0);
}
/* Add zero or more directories to the front of an arbitrary path. */
void
-mod_path (char *dirname, char **which_path)
+mod_path (const char *dirname, char **which_path)
{
add_path (dirname, which_path, 1);
}
as space or tab. */
void
-add_path (char *dirname, char **which_path, int parse_separators)
+add_path (const char *dirname, char **which_path, int parse_separators)
{
char *old = *which_path;
int prefix = 0;
- VEC (char_ptr) *dir_vec = NULL;
- struct cleanup *back_to;
- int ix;
- char *name;
+ std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec;
if (dirname == 0)
return;
if (parse_separators)
{
- char **argv, **argvp;
-
/* This will properly parse the space and tab separators
and any quotes that may exist. */
- argv = gdb_buildargv (dirname);
+ gdb_argv argv (dirname);
- for (argvp = argv; *argvp; argvp++)
- dirnames_to_char_ptr_vec_append (&dir_vec, *argvp);
-
- freeargv (argv);
+ for (char *arg : argv)
+ dirnames_to_char_ptr_vec_append (&dir_vec, arg);
}
else
- VEC_safe_push (char_ptr, dir_vec, xstrdup (dirname));
- back_to = make_cleanup_free_char_ptr_vec (dir_vec);
+ dir_vec.emplace_back (xstrdup (dirname));
- for (ix = 0; VEC_iterate (char_ptr, dir_vec, ix, name); ++ix)
+ for (const gdb::unique_xmalloc_ptr<char> &name_up : dir_vec)
{
+ char *name = name_up.get ();
char *p;
struct stat st;
+ gdb::unique_xmalloc_ptr<char> new_name_holder;
/* Spaces and tabs will have been removed by buildargv().
NAME is the start of the directory.
}
if (name[0] == '~')
- name = tilde_expand (name);
+ new_name_holder.reset (tilde_expand (name));
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
else if (IS_ABSOLUTE_PATH (name) && p == name + 2) /* "d:" => "d:." */
- name = concat (name, ".", (char *)NULL);
+ new_name_holder.reset (concat (name, ".", (char *) NULL));
#endif
else if (!IS_ABSOLUTE_PATH (name) && name[0] != '$')
- name = concat (current_directory, SLASH_STRING, name, (char *)NULL);
+ new_name_holder.reset (concat (current_directory, SLASH_STRING, name,
+ (char *) NULL));
else
- name = savestring (name, p - name);
- make_cleanup (xfree, name);
+ new_name_holder.reset (savestring (name, p - name));
+ name = new_name_holder.get ();
/* Unless it's a variable, check existence. */
if (name[0] != '$')
char tinybuf[2];
p = *which_path;
- /* FIXME: we should use realpath() or its work-alike
- before comparing. Then all the code above which
- removes excess slashes and dots could simply go away. */
- if (!filename_cmp (p, name))
+ while (1)
{
- /* Found it in the search path, remove old copy. */
- if (p > *which_path)
- p--; /* Back over leading separator. */
- if (prefix > p - *which_path)
- goto skip_dup; /* Same dir twice in one cmd. */
- memmove (p, &p[len + 1], strlen (&p[len + 1]) + 1); /* Copy from next \0 or : */
+ /* FIXME: we should use realpath() or its work-alike
+ before comparing. Then all the code above which
+ removes excess slashes and dots could simply go away. */
+ if (!filename_ncmp (p, name, len)
+ && (p[len] == '\0' || p[len] == DIRNAME_SEPARATOR))
+ {
+ /* Found it in the search path, remove old copy. */
+ if (p > *which_path)
+ {
+ /* Back over leading separator. */
+ p--;
+ }
+ if (prefix > p - *which_path)
+ {
+ /* Same dir twice in one cmd. */
+ goto skip_dup;
+ }
+ /* Copy from next '\0' or ':'. */
+ memmove (p, &p[len + 1], strlen (&p[len + 1]) + 1);
+ }
+ p = strchr (p, DIRNAME_SEPARATOR);
+ if (p != 0)
+ ++p;
+ else
+ break;
}
tinybuf[0] = DIRNAME_SEPARATOR;
skip_dup:
;
}
-
- do_cleanups (back_to);
}
static void
-source_info (char *ignore, int from_tty)
+info_source_command (const char *ignore, int from_tty)
{
struct symtab *s = current_source_symtab;
+ struct compunit_symtab *cust;
if (!s)
{
printf_filtered (_("No current source file.\n"));
return;
}
+
+ cust = SYMTAB_COMPUNIT (s);
printf_filtered (_("Current source file is %s\n"), s->filename);
- if (s->dirname)
- printf_filtered (_("Compilation directory is %s\n"), s->dirname);
+ if (SYMTAB_DIRNAME (s) != NULL)
+ printf_filtered (_("Compilation directory is %s\n"), SYMTAB_DIRNAME (s));
if (s->fullname)
printf_filtered (_("Located in %s\n"), s->fullname);
if (s->nlines)
s->nlines == 1 ? "" : "s");
printf_filtered (_("Source language is %s.\n"), language_str (s->language));
- printf_filtered (_("Compiled with %s debugging format.\n"), s->debugformat);
+ printf_filtered (_("Producer is %s.\n"),
+ COMPUNIT_PRODUCER (cust) != NULL
+ ? COMPUNIT_PRODUCER (cust) : _("unknown"));
+ printf_filtered (_("Compiled with %s debugging format.\n"),
+ COMPUNIT_DEBUGFORMAT (cust));
printf_filtered (_("%s preprocessor macro info.\n"),
- s->macro_table ? "Includes" : "Does not include");
+ COMPUNIT_MACRO_TABLE (cust) != NULL
+ ? "Includes" : "Does not include");
}
\f
-/* Return True if the file NAME exists and is a regular file. */
-static int
-is_regular_file (const char *name)
-{
- struct stat st;
- const int status = stat (name, &st);
-
- /* Stat should never fail except when the file does not exist.
- If stat fails, analyze the source of error and return True
- unless the file does not exist, to avoid returning false results
- on obscure systems where stat does not work as expected. */
-
- if (status != 0)
- return (errno != ENOENT);
-
- return S_ISREG (st.st_mode);
-}
-
/* Open a file named STRING, searching path PATH (dir names sep by some char)
using mode MODE in the calls to open. You cannot use this function to
create files (O_CREAT).
If OPF_TRY_CWD_FIRST, try to open ./STRING before searching PATH.
(ie pretend the first element of PATH is "."). This also indicates
- that a slash in STRING disables searching of the path (this is
- so that "exec-file ./foo" or "symbol-file ./foo" insures that you
- get that particular version of foo or an error message).
+ that, unless OPF_SEARCH_IN_PATH is also specified, a slash in STRING
+ disables searching of the path (this is so that "exec-file ./foo" or
+ "symbol-file ./foo" insures that you get that particular version of
+ foo or an error message).
If OPTS has OPF_SEARCH_IN_PATH set, absolute names will also be
searched in path (we usually want this for source files but not for
and the file, sigh! Emacs gets confuzzed by this when we print the
source file name!!!
+ If OPTS has OPF_RETURN_REALPATH set return FILENAME_OPENED resolved by
+ gdb_realpath. Even without OPF_RETURN_REALPATH this function still returns
+ filename starting with "/". If FILENAME_OPENED is NULL this option has no
+ effect.
+
If a file is found, return the descriptor.
Otherwise, return -1, with errno set for the last name we tried to open. */
/* >>>> This should only allow files of certain types,
>>>> eg executable, non-directory. */
int
-openp (const char *path, int opts, const char *string,
- int mode, char **filename_opened)
+openp (const char *path, openp_flags opts, const char *string,
+ int mode, gdb::unique_xmalloc_ptr<char> *filename_opened)
{
int fd;
char *filename;
int alloclen;
- VEC (char_ptr) *dir_vec;
- struct cleanup *back_to;
- int ix;
- char *dir;
+ /* The errno set for the last name we tried to open (and
+ failed). */
+ int last_errno = 0;
+ std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec;
/* The open syscall MODE parameter is not specified. */
gdb_assert ((mode & O_CREAT) == 0);
if ((opts & OPF_TRY_CWD_FIRST) || IS_ABSOLUTE_PATH (string))
{
- int i;
+ int i, reg_file_errno;
- if (is_regular_file (string))
+ if (is_regular_file (string, ®_file_errno))
{
- filename = alloca (strlen (string) + 1);
+ filename = (char *) alloca (strlen (string) + 1);
strcpy (filename, string);
- fd = open (filename, mode);
+ fd = gdb_open_cloexec (filename, mode, 0);
if (fd >= 0)
goto done;
+ last_errno = errno;
}
else
{
filename = NULL;
fd = -1;
+ last_errno = reg_file_errno;
}
if (!(opts & OPF_SEARCH_IN_PATH))
string += 2;
alloclen = strlen (path) + strlen (string) + 2;
- filename = alloca (alloclen);
+ filename = (char *) alloca (alloclen);
fd = -1;
+ last_errno = ENOENT;
dir_vec = dirnames_to_char_ptr_vec (path);
- back_to = make_cleanup_free_char_ptr_vec (dir_vec);
- for (ix = 0; VEC_iterate (char_ptr, dir_vec, ix, dir); ++ix)
+ for (const gdb::unique_xmalloc_ptr<char> &dir_up : dir_vec)
{
+ char *dir = dir_up.get ();
size_t len = strlen (dir);
+ int reg_file_errno;
if (strcmp (dir, "$cwd") == 0)
{
if (newlen > alloclen)
{
alloclen = newlen;
- filename = alloca (alloclen);
+ filename = (char *) alloca (alloclen);
}
strcpy (filename, current_directory);
}
{
/* See whether we need to expand the tilde. */
int newlen;
- char *tilde_expanded;
- tilde_expanded = tilde_expand (dir);
+ gdb::unique_xmalloc_ptr<char> tilde_expanded (tilde_expand (dir));
/* First, realloc the filename buffer if too short. */
- len = strlen (tilde_expanded);
+ len = strlen (tilde_expanded.get ());
newlen = len + strlen (string) + 2;
if (newlen > alloclen)
{
alloclen = newlen;
- filename = alloca (alloclen);
+ filename = (char *) alloca (alloclen);
}
- strcpy (filename, tilde_expanded);
- xfree (tilde_expanded);
+ strcpy (filename, tilde_expanded.get ());
}
else
{
strcat (filename + len, SLASH_STRING);
strcat (filename, string);
- if (is_regular_file (filename))
+ if (is_regular_file (filename, ®_file_errno))
{
- fd = open (filename, mode);
+ fd = gdb_open_cloexec (filename, mode, 0);
if (fd >= 0)
break;
+ last_errno = errno;
}
+ else
+ last_errno = reg_file_errno;
}
- do_cleanups (back_to);
-
done:
if (filename_opened)
{
/* If a file was opened, canonicalize its filename. */
if (fd < 0)
- *filename_opened = NULL;
- else if (IS_ABSOLUTE_PATH (filename))
+ filename_opened->reset (NULL);
+ else if ((opts & OPF_RETURN_REALPATH) != 0)
*filename_opened = gdb_realpath (filename);
else
- {
- /* Beware the // my son, the Emacs barfs, the botch that catch... */
-
- char *f = concat (current_directory,
- IS_DIR_SEPARATOR (current_directory[strlen (current_directory) - 1])
- ? "" : SLASH_STRING,
- filename, (char *)NULL);
-
- *filename_opened = gdb_realpath (f);
- xfree (f);
- }
+ *filename_opened = gdb_abspath (filename);
}
+ errno = last_errno;
return fd;
}
Else, this functions returns 0, and FULL_PATHNAME is set to NULL. */
int
-source_full_path_of (const char *filename, char **full_pathname)
+source_full_path_of (const char *filename,
+ gdb::unique_xmalloc_ptr<char> *full_pathname)
{
int fd;
- fd = openp (source_path, OPF_TRY_CWD_FIRST | OPF_SEARCH_IN_PATH, filename,
- O_RDONLY, full_pathname);
+ fd = openp (source_path,
+ OPF_TRY_CWD_FIRST | OPF_SEARCH_IN_PATH | OPF_RETURN_REALPATH,
+ filename, O_RDONLY, full_pathname);
if (fd < 0)
{
- *full_pathname = NULL;
+ full_pathname->reset (NULL);
return 0;
}
{
const int from_len = strlen (rule->from);
const int path_len = strlen (path);
- char *path_start;
if (path_len < from_len)
return 0;
/* The substitution rules are anchored at the start of the path,
- so the path should start with rule->from. There is no filename
- comparison routine, so we need to extract the first FROM_LEN
- characters from PATH first and use that to do the comparison. */
-
- path_start = alloca (from_len + 1);
- strncpy (path_start, path, from_len);
- path_start[from_len] = '\0';
+ so the path should start with rule->from. */
- if (FILENAME_CMP (path_start, rule->from) != 0)
+ if (filename_ncmp (path, rule->from, from_len) != 0)
return 0;
/* Make sure that the region in the path that matches the substitution
rule is immediately followed by a directory separator (or the end of
string character). */
-
+
if (path[from_len] != '\0' && !IS_DIR_SEPARATOR (path[from_len]))
return 0;
}
/* If the user specified a source path substitution rule that applies
- to PATH, then apply it and return the new path. This new path must
- be deallocated afterwards.
-
+ to PATH, then apply it and return the new path.
+
Return NULL if no substitution rule was specified by the user,
or if no rule applied to the given PATH. */
-
-char *
+
+gdb::unique_xmalloc_ptr<char>
rewrite_source_path (const char *path)
{
const struct substitute_path_rule *rule = get_substitute_path_rule (path);
strcpy (new_path, rule->to);
strcat (new_path, path + from_len);
- return new_path;
+ return gdb::unique_xmalloc_ptr<char> (new_path);
}
-int
+/* See source.h. */
+
+scoped_fd
find_and_open_source (const char *filename,
const char *dirname,
- char **fullname)
+ gdb::unique_xmalloc_ptr<char> *fullname)
{
char *path = source_path;
const char *p;
/* The user may have requested that source paths be rewritten
according to substitution rules he provided. If a substitution
rule applies to this path, then apply it. */
- char *rewritten_fullname = rewrite_source_path (*fullname);
+ gdb::unique_xmalloc_ptr<char> rewritten_fullname
+ = rewrite_source_path (fullname->get ());
if (rewritten_fullname != NULL)
- {
- xfree (*fullname);
- *fullname = rewritten_fullname;
- }
+ *fullname = std::move (rewritten_fullname);
- result = open (*fullname, OPEN_MODE);
+ result = gdb_open_cloexec (fullname->get (), OPEN_MODE, 0);
if (result >= 0)
{
- char *lpath = gdb_realpath (*fullname);
-
- xfree (*fullname);
- *fullname = lpath;
- return result;
+ *fullname = gdb_realpath (fullname->get ());
+ return scoped_fd (result);
}
/* Didn't work -- free old one, try again. */
- xfree (*fullname);
- *fullname = NULL;
+ fullname->reset (NULL);
}
+ gdb::unique_xmalloc_ptr<char> rewritten_dirname;
if (dirname != NULL)
{
/* If necessary, rewrite the compilation directory name according
to the source path substitution rules specified by the user. */
- char *rewritten_dirname = rewrite_source_path (dirname);
+ rewritten_dirname = rewrite_source_path (dirname);
if (rewritten_dirname != NULL)
- {
- make_cleanup (xfree, rewritten_dirname);
- dirname = rewritten_dirname;
- }
-
+ dirname = rewritten_dirname.get ();
+
/* Replace a path entry of $cdir with the compilation directory
name. */
#define cdir_len 5
}
}
+ gdb::unique_xmalloc_ptr<char> rewritten_filename;
if (IS_ABSOLUTE_PATH (filename))
{
/* If filename is absolute path, try the source path
substitution on it. */
- char *rewritten_filename = rewrite_source_path (filename);
+ rewritten_filename = rewrite_source_path (filename);
if (rewritten_filename != NULL)
- {
- make_cleanup (xfree, rewritten_filename);
- filename = rewritten_filename;
- }
+ filename = rewritten_filename.get ();
}
- result = openp (path, OPF_SEARCH_IN_PATH, filename, OPEN_MODE, fullname);
+ result = openp (path, OPF_SEARCH_IN_PATH | OPF_RETURN_REALPATH, filename,
+ OPEN_MODE, fullname);
if (result < 0)
{
/* Didn't work. Try using just the basename. */
p = lbasename (filename);
if (p != filename)
- result = openp (path, OPF_SEARCH_IN_PATH, p, OPEN_MODE, fullname);
+ result = openp (path, OPF_SEARCH_IN_PATH | OPF_RETURN_REALPATH, p,
+ OPEN_MODE, fullname);
}
- return result;
+ return scoped_fd (result);
}
/* Open a source file given a symtab S. Returns a file descriptor or
This function is a convience function to find_and_open_source. */
-int
+scoped_fd
open_source_file (struct symtab *s)
{
if (!s)
- return -1;
+ return scoped_fd (-1);
- return find_and_open_source (s->filename, s->dirname, &s->fullname);
+ gdb::unique_xmalloc_ptr<char> fullname (s->fullname);
+ s->fullname = NULL;
+ scoped_fd fd = find_and_open_source (s->filename, SYMTAB_DIRNAME (s),
+ &fullname);
+ s->fullname = fullname.release ();
+ return fd;
}
/* Finds the fullname that a symtab represents.
to handle cases like the file being moved. */
if (s->fullname == NULL)
{
- int fd = find_and_open_source (s->filename, s->dirname, &s->fullname);
+ scoped_fd fd = open_source_file (s);
- if (fd >= 0)
- close (fd);
- else
+ if (fd.get () < 0)
{
- char *fullname;
- struct cleanup *back_to;
+ gdb::unique_xmalloc_ptr<char> fullname;
/* rewrite_source_path would be applied by find_and_open_source, we
should report the pathname where GDB tried to find the file. */
- if (s->dirname == NULL || IS_ABSOLUTE_PATH (s->filename))
- fullname = xstrdup (s->filename);
+ if (SYMTAB_DIRNAME (s) == NULL || IS_ABSOLUTE_PATH (s->filename))
+ fullname.reset (xstrdup (s->filename));
else
- fullname = concat (s->dirname, SLASH_STRING, s->filename, NULL);
+ fullname.reset (concat (SYMTAB_DIRNAME (s), SLASH_STRING,
+ s->filename, (char *) NULL));
- back_to = make_cleanup (xfree, fullname);
- s->fullname = rewrite_source_path (fullname);
+ s->fullname = rewrite_source_path (fullname.get ()).release ();
if (s->fullname == NULL)
- s->fullname = xstrdup (fullname);
- do_cleanups (back_to);
+ s->fullname = fullname.release ();
}
}
find_source_lines (struct symtab *s, int desc)
{
struct stat st;
- char *data, *p, *end;
+ char *p, *end;
int nlines = 0;
int lines_allocated = 1000;
int *line_charpos;
int size;
gdb_assert (s);
- line_charpos = (int *) xmalloc (lines_allocated * sizeof (int));
+ line_charpos = XNEWVEC (int, lines_allocated);
if (fstat (desc, &st) < 0)
perror_with_name (symtab_to_filename_for_display (s));
- if (s->objfile && s->objfile->obfd)
- mtime = s->objfile->mtime;
+ if (SYMTAB_OBJFILE (s) != NULL && SYMTAB_OBJFILE (s)->obfd != NULL)
+ mtime = SYMTAB_OBJFILE (s)->mtime;
else if (exec_bfd)
mtime = exec_bfd_mtime;
warning (_("Source file is more recent than executable."));
{
- struct cleanup *old_cleanups;
-
/* st_size might be a large type, but we only support source files whose
size fits in an int. */
size = (int) st.st_size;
- /* Use malloc, not alloca, because this may be pretty large, and we may
- run into various kinds of limits on stack size. */
- data = (char *) xmalloc (size);
- old_cleanups = make_cleanup (xfree, data);
+ /* Use the heap, not the stack, because this may be pretty large,
+ and we may run into various kinds of limits on stack size. */
+ gdb::def_vector<char> data (size);
/* Reassign `size' to result of read for systems where \r\n -> \n. */
- size = myread (desc, data, size);
+ size = myread (desc, data.data (), size);
if (size < 0)
perror_with_name (symtab_to_filename_for_display (s));
- end = data + size;
- p = data;
+ end = data.data () + size;
+ p = &data[0];
line_charpos[0] = 0;
nlines = 1;
while (p != end)
(int *) xrealloc ((char *) line_charpos,
sizeof (int) * lines_allocated);
}
- line_charpos[nlines++] = p - data;
+ line_charpos[nlines++] = p - data.data ();
}
}
- do_cleanups (old_cleanups);
}
s->nlines = nlines;
\f
/* Get full pathname and line number positions for a symtab.
- Return nonzero if line numbers may have changed.
Set *FULLNAME to actual name of the file as found by `openp',
or to 0 if the file is not found. */
-static int
+static void
get_filename_and_charpos (struct symtab *s, char **fullname)
{
- int desc, linenums_changed = 0;
- struct cleanup *cleanups;
-
- desc = open_source_file (s);
- if (desc < 0)
+ scoped_fd desc = open_source_file (s);
+ if (desc.get () < 0)
{
if (fullname)
*fullname = NULL;
- return 0;
+ return;
}
- cleanups = make_cleanup_close (desc);
if (fullname)
*fullname = s->fullname;
if (s->line_charpos == 0)
- linenums_changed = 1;
- if (linenums_changed)
- find_source_lines (s, desc);
- do_cleanups (cleanups);
- return linenums_changed;
+ find_source_lines (s, desc.get ());
}
-/* Print text describing the full name of the source file S
- and the line number LINE and its corresponding character position.
- The text starts with two Ctrl-z so that the Emacs-GDB interface
- can easily find it.
-
- MID_STATEMENT is nonzero if the PC is not at the beginning of that line.
-
- Return 1 if successful, 0 if could not find the file. */
+/* See source.h. */
int
identify_source_line (struct symtab *s, int line, int mid_statement,
/* Don't index off the end of the line_charpos array. */
return 0;
annotate_source (s->fullname, line, s->line_charpos[line - 1],
- mid_statement, get_objfile_arch (s->objfile), pc);
+ mid_statement, get_objfile_arch (SYMTAB_OBJFILE (s)), pc);
current_source_line = line;
- first_line_listed = line;
- last_line_listed = line;
current_source_symtab = s;
+ clear_lines_listed_range ();
return 1;
}
\f
static void
print_source_lines_base (struct symtab *s, int line, int stopline,
- enum print_source_lines_flags flags)
+ print_source_lines_flags flags)
{
int c;
- int desc;
+ scoped_fd desc;
int noprint = 0;
- FILE *stream;
int nlines = stopline - line;
- struct cleanup *cleanup;
struct ui_out *uiout = current_uiout;
/* Regardless of whether we can open the file, set current_source_symtab. */
/* If printing of source lines is disabled, just print file and line
number. */
- if (ui_out_test_flags (uiout, ui_source_list))
+ if (uiout->test_flags (ui_source_list))
{
/* Only prints "No such file or directory" once. */
if ((s != last_source_visited) || (!last_source_error))
{
last_source_visited = s;
desc = open_source_file (s);
+ if (desc.get () < 0)
+ {
+ last_source_error = desc.get ();
+ noprint = 1;
+ }
}
else
{
- desc = last_source_error;
flags |= PRINT_SOURCE_LINES_NOERROR;
+ noprint = 1;
}
}
else
{
- desc = last_source_error;
- flags |= PRINT_SOURCE_LINES_NOERROR;
+ flags |= PRINT_SOURCE_LINES_NOERROR;
noprint = 1;
}
- if (desc < 0 || noprint)
+ if (noprint)
{
- last_source_error = desc;
-
if (!(flags & PRINT_SOURCE_LINES_NOERROR))
{
const char *filename = symtab_to_filename_for_display (s);
int len = strlen (filename) + 100;
- char *name = alloca (len);
+ char *name = (char *) alloca (len);
xsnprintf (name, len, "%d\t%s", line, filename);
print_sys_errmsg (name, errno);
}
else
{
- ui_out_field_int (uiout, "line", line);
- ui_out_text (uiout, "\tin ");
+ uiout->field_int ("line", line);
+ uiout->text ("\tin ");
/* CLI expects only the "file" field. TUI expects only the
"fullname" field (and TUI does break if "file" is printed).
MI expects both fields. ui_source_list is set only for CLI,
not for TUI. */
- if (ui_out_is_mi_like_p (uiout)
- || ui_out_test_flags (uiout, ui_source_list))
- ui_out_field_string (uiout, "file",
- symtab_to_filename_for_display (s));
- if (ui_out_is_mi_like_p (uiout)
- || !ui_out_test_flags (uiout, ui_source_list))
+ if (uiout->is_mi_like_p () || uiout->test_flags (ui_source_list))
+ uiout->field_string ("file", symtab_to_filename_for_display (s),
+ ui_out_style_kind::FILE);
+ if (uiout->is_mi_like_p () || !uiout->test_flags (ui_source_list))
{
const char *s_fullname = symtab_to_fullname (s);
char *local_fullname;
/* ui_out_field_string may free S_FULLNAME by calling
open_source_file for it again. See e.g.,
tui_field_string->tui_show_source. */
- local_fullname = alloca (strlen (s_fullname) + 1);
+ local_fullname = (char *) alloca (strlen (s_fullname) + 1);
strcpy (local_fullname, s_fullname);
- ui_out_field_string (uiout, "fullname", local_fullname);
+ uiout->field_string ("fullname", local_fullname);
}
- ui_out_text (uiout, "\n");
+ uiout->text ("\n");
}
return;
last_source_error = 0;
- if (s->line_charpos == 0)
- find_source_lines (s, desc);
-
- if (line < 1 || line > s->nlines)
- {
- close (desc);
- error (_("Line number %d out of range; %s has %d lines."),
- line, symtab_to_filename_for_display (s), s->nlines);
- }
-
- if (lseek (desc, s->line_charpos[line - 1], 0) < 0)
- {
- close (desc);
- perror_with_name (symtab_to_filename_for_display (s));
- }
+ /* If the user requested a sequence of lines that seems to go backward
+ (from high to low line numbers) then we don't print anything. */
+ if (stopline <= line)
+ return;
- stream = fdopen (desc, FDOPEN_MODE);
- clearerr (stream);
- cleanup = make_cleanup_fclose (stream);
+ std::string lines;
+ if (!g_source_cache.get_source_lines (s, line, stopline - 1, &lines))
+ error (_("Line number %d out of range; %s has %d lines."),
+ line, symtab_to_filename_for_display (s), s->nlines);
+ const char *iter = lines.c_str ();
while (nlines-- > 0)
{
char buf[20];
- c = fgetc (stream);
- if (c == EOF)
+ c = *iter++;
+ if (c == '\0')
break;
last_line_listed = current_source_line;
if (flags & PRINT_SOURCE_LINES_FILENAME)
{
- ui_out_text (uiout, symtab_to_filename_for_display (s));
- ui_out_text (uiout, ":");
+ uiout->text (symtab_to_filename_for_display (s));
+ uiout->text (":");
}
xsnprintf (buf, sizeof (buf), "%d\t", current_source_line++);
- ui_out_text (uiout, buf);
+ uiout->text (buf);
do
{
- if (c < 040 && c != '\t' && c != '\n' && c != '\r')
+ if (c < 040 && c != '\t' && c != '\n' && c != '\r' && c != '\033')
{
xsnprintf (buf, sizeof (buf), "^%c", c + 0100);
- ui_out_text (uiout, buf);
+ uiout->text (buf);
}
else if (c == 0177)
- ui_out_text (uiout, "^?");
+ uiout->text ("^?");
else if (c == '\r')
{
/* Skip a \r character, but only before a \n. */
- int c1 = fgetc (stream);
-
- if (c1 != '\n')
+ if (*iter != '\n')
printf_filtered ("^%c", c + 0100);
- if (c1 != EOF)
- ungetc (c1, stream);
}
else
{
xsnprintf (buf, sizeof (buf), "%c", c);
- ui_out_text (uiout, buf);
+ uiout->text (buf);
}
}
- while (c != '\n' && (c = fgetc (stream)) >= 0);
+ while (c != '\n' && (c = *iter++) != '\0');
+ if (c == '\0')
+ break;
}
-
- do_cleanups (cleanup);
+ if (!lines.empty() && lines.back () != '\n')
+ uiout->text ("\n");
}
\f
-/* Show source lines from the file of symtab S, starting with line
- number LINE and stopping before line number STOPLINE. If this is
- not the command line version, then the source is shown in the source
- window otherwise it is simply printed. */
+
+/* See source.h. */
void
print_source_lines (struct symtab *s, int line, int stopline,
- enum print_source_lines_flags flags)
+ print_source_lines_flags flags)
{
print_source_lines_base (s, line, stopline, flags);
}
+
+/* See source.h. */
+
+void
+print_source_lines (struct symtab *s, source_lines_range line_range,
+ print_source_lines_flags flags)
+{
+ print_source_lines_base (s, line_range.startline (),
+ line_range.stopline (), flags);
+}
+
+
\f
/* Print info on range of pc's in a specified line. */
static void
-line_info (char *arg, int from_tty)
+info_line_command (const char *arg, int from_tty)
{
- struct symtabs_and_lines sals;
- struct symtab_and_line sal;
CORE_ADDR start_pc, end_pc;
- int i;
- struct cleanup *cleanups;
- init_sal (&sal); /* initialize to zeroes */
+ std::vector<symtab_and_line> decoded_sals;
+ symtab_and_line curr_sal;
+ gdb::array_view<symtab_and_line> sals;
if (arg == 0)
{
- sal.symtab = current_source_symtab;
- sal.pspace = current_program_space;
- sal.line = last_line_listed;
- sals.nelts = 1;
- sals.sals = (struct symtab_and_line *)
- xmalloc (sizeof (struct symtab_and_line));
- sals.sals[0] = sal;
+ curr_sal.symtab = current_source_symtab;
+ curr_sal.pspace = current_program_space;
+ if (last_line_listed != 0)
+ curr_sal.line = last_line_listed;
+ else
+ curr_sal.line = current_source_line;
+
+ sals = curr_sal;
}
else
{
- sals = decode_line_with_last_displayed (arg, DECODE_LINE_LIST_MODE);
+ decoded_sals = decode_line_with_last_displayed (arg,
+ DECODE_LINE_LIST_MODE);
+ sals = decoded_sals;
dont_repeat ();
}
- cleanups = make_cleanup (xfree, sals.sals);
-
/* C++ More than one line may have been specified, as when the user
specifies an overloaded function name. Print info on them all. */
- for (i = 0; i < sals.nelts; i++)
+ for (const auto &sal : sals)
{
- sal = sals.sals[i];
if (sal.pspace != current_program_space)
continue;
else if (sal.line > 0
&& find_line_pc_range (sal, &start_pc, &end_pc))
{
- struct gdbarch *gdbarch = get_objfile_arch (sal.symtab->objfile);
+ struct gdbarch *gdbarch
+ = get_objfile_arch (SYMTAB_OBJFILE (sal.symtab));
if (start_pc == end_pc)
{
/* If this is the only line, show the source code. If it could
not find the file, don't do anything special. */
- if (annotation_level && sals.nelts == 1)
+ if (annotation_level && sals.size () == 1)
identify_source_line (sal.symtab, sal.line, 0, start_pc);
}
else
printf_filtered (_("Line number %d is out of range for \"%s\".\n"),
sal.line, symtab_to_filename_for_display (sal.symtab));
}
- do_cleanups (cleanups);
}
\f
/* Commands to search the source file for a regexp. */
+/* Helper for forward_search_command/reverse_search_command. FORWARD
+ indicates direction: true for forward, false for
+ backward/reverse. */
+
static void
-forward_search_command (char *regex, int from_tty)
+search_command_helper (const char *regex, int from_tty, bool forward)
{
- int c;
- int desc;
- FILE *stream;
- int line;
- char *msg;
- struct cleanup *cleanups;
-
- line = last_line_listed + 1;
-
- msg = (char *) re_comp (regex);
+ const char *msg = re_comp (regex);
if (msg)
error (("%s"), msg);
if (current_source_symtab == 0)
select_source_symtab (0);
- desc = open_source_file (current_source_symtab);
- if (desc < 0)
+ scoped_fd desc = open_source_file (current_source_symtab);
+ if (desc.get () < 0)
perror_with_name (symtab_to_filename_for_display (current_source_symtab));
- cleanups = make_cleanup_close (desc);
if (current_source_symtab->line_charpos == 0)
- find_source_lines (current_source_symtab, desc);
+ find_source_lines (current_source_symtab, desc.get ());
+
+ int line = (forward
+ ? last_line_listed + 1
+ : last_line_listed - 1);
if (line < 1 || line > current_source_symtab->nlines)
error (_("Expression not found"));
- if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0)
+ if (lseek (desc.get (), current_source_symtab->line_charpos[line - 1], 0)
+ < 0)
perror_with_name (symtab_to_filename_for_display (current_source_symtab));
- discard_cleanups (cleanups);
- stream = fdopen (desc, FDOPEN_MODE);
- clearerr (stream);
- cleanups = make_cleanup_fclose (stream);
+ gdb_file_up stream = desc.to_file (FDOPEN_MODE);
+ clearerr (stream.get ());
+
+ gdb::def_vector<char> buf;
+ buf.reserve (256);
+
while (1)
{
- static char *buf = NULL;
- char *p;
- int cursize, newsize;
-
- cursize = 256;
- buf = xmalloc (cursize);
- p = buf;
+ buf.resize (0);
- c = getc (stream);
+ int c = fgetc (stream.get ());
if (c == EOF)
break;
do
{
- *p++ = c;
- if (p - buf == cursize)
- {
- newsize = cursize + cursize / 2;
- buf = xrealloc (buf, newsize);
- p = buf + cursize;
- cursize = newsize;
- }
+ buf.push_back (c);
}
- while (c != '\n' && (c = getc (stream)) >= 0);
+ while (c != '\n' && (c = fgetc (stream.get ())) >= 0);
/* Remove the \r, if any, at the end of the line, otherwise
regular expressions that end with $ or \n won't work. */
- if (p - buf > 1 && p[-2] == '\r')
+ size_t sz = buf.size ();
+ if (sz >= 2 && buf[sz - 2] == '\r')
{
- p--;
- p[-1] = '\n';
+ buf[sz - 2] = '\n';
+ buf.resize (sz - 1);
}
/* We now have a source line in buf, null terminate and match. */
- *p = 0;
- if (re_exec (buf) > 0)
+ buf.push_back ('\0');
+ if (re_exec (buf.data ()) > 0)
{
/* Match! */
- do_cleanups (cleanups);
print_source_lines (current_source_symtab, line, line + 1, 0);
set_internalvar_integer (lookup_internalvar ("_"), line);
- current_source_line = max (line - lines_to_list / 2, 1);
+ current_source_line = std::max (line - lines_to_list / 2, 1);
return;
}
- line++;
+
+ if (forward)
+ line++;
+ else
+ {
+ line--;
+ if (line < 1)
+ break;
+ if (fseek (stream.get (),
+ current_source_symtab->line_charpos[line - 1], 0) < 0)
+ {
+ const char *filename
+ = symtab_to_filename_for_display (current_source_symtab);
+ perror_with_name (filename);
+ }
+ }
}
printf_filtered (_("Expression not found\n"));
- do_cleanups (cleanups);
}
static void
-reverse_search_command (char *regex, int from_tty)
+forward_search_command (const char *regex, int from_tty)
{
- int c;
- int desc;
- FILE *stream;
- int line;
- char *msg;
- struct cleanup *cleanups;
-
- line = last_line_listed - 1;
-
- msg = (char *) re_comp (regex);
- if (msg)
- error (("%s"), msg);
-
- if (current_source_symtab == 0)
- select_source_symtab (0);
-
- desc = open_source_file (current_source_symtab);
- if (desc < 0)
- perror_with_name (symtab_to_filename_for_display (current_source_symtab));
- cleanups = make_cleanup_close (desc);
-
- if (current_source_symtab->line_charpos == 0)
- find_source_lines (current_source_symtab, desc);
-
- if (line < 1 || line > current_source_symtab->nlines)
- error (_("Expression not found"));
-
- if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0)
- perror_with_name (symtab_to_filename_for_display (current_source_symtab));
-
- discard_cleanups (cleanups);
- stream = fdopen (desc, FDOPEN_MODE);
- clearerr (stream);
- cleanups = make_cleanup_fclose (stream);
- while (line > 1)
- {
-/* FIXME!!! We walk right off the end of buf if we get a long line!!! */
- char buf[4096]; /* Should be reasonable??? */
- char *p = buf;
-
- c = getc (stream);
- if (c == EOF)
- break;
- do
- {
- *p++ = c;
- }
- while (c != '\n' && (c = getc (stream)) >= 0);
-
- /* Remove the \r, if any, at the end of the line, otherwise
- regular expressions that end with $ or \n won't work. */
- if (p - buf > 1 && p[-2] == '\r')
- {
- p--;
- p[-1] = '\n';
- }
-
- /* We now have a source line in buf; null terminate and match. */
- *p = 0;
- if (re_exec (buf) > 0)
- {
- /* Match! */
- do_cleanups (cleanups);
- print_source_lines (current_source_symtab, line, line + 1, 0);
- set_internalvar_integer (lookup_internalvar ("_"), line);
- current_source_line = max (line - lines_to_list / 2, 1);
- return;
- }
- line--;
- if (fseek (stream, current_source_symtab->line_charpos[line - 1], 0) < 0)
- {
- const char *filename;
-
- do_cleanups (cleanups);
- filename = symtab_to_filename_for_display (current_source_symtab);
- perror_with_name (filename);
- }
- }
+ search_command_helper (regex, from_tty, true);
+}
- printf_filtered (_("Expression not found\n"));
- do_cleanups (cleanups);
- return;
+static void
+reverse_search_command (const char *regex, int from_tty)
+{
+ search_command_helper (regex, from_tty, false);
}
/* If the last character of PATH is a directory separator, then strip it. */
add_substitute_path_rule (char *from, char *to)
{
struct substitute_path_rule *rule;
- struct substitute_path_rule *new_rule;
+ struct substitute_path_rule *new_rule = XNEW (struct substitute_path_rule);
- new_rule = xmalloc (sizeof (struct substitute_path_rule));
new_rule->from = xstrdup (from);
new_rule->to = xstrdup (to);
new_rule->next = NULL;
/* Implement the "show substitute-path" command. */
static void
-show_substitute_path_command (char *args, int from_tty)
+show_substitute_path_command (const char *args, int from_tty)
{
struct substitute_path_rule *rule = substitute_path_rules;
- char **argv;
char *from = NULL;
- argv = gdb_buildargv (args);
- make_cleanup_freeargv (argv);
+ gdb_argv argv (args);
/* We expect zero or one argument. */
while (rule != NULL)
{
- if (from == NULL || FILENAME_CMP (rule->from, from) == 0)
+ if (from == NULL || substitute_path_rule_matches (rule, from) != 0)
printf_filtered (" `%s' -> `%s'.\n", rule->from, rule->to);
rule = rule->next;
}
/* Implement the "unset substitute-path" command. */
static void
-unset_substitute_path_command (char *args, int from_tty)
+unset_substitute_path_command (const char *args, int from_tty)
{
struct substitute_path_rule *rule = substitute_path_rules;
- char **argv = gdb_buildargv (args);
+ gdb_argv argv (args);
char *from = NULL;
int rule_found = 0;
/* This function takes either 0 or 1 argument. */
- make_cleanup_freeargv (argv);
if (argv != NULL && argv[0] != NULL && argv[1] != NULL)
error (_("Incorrect usage, too many arguments in command"));
/* Add a new source path substitution rule. */
static void
-set_substitute_path_command (char *args, int from_tty)
+set_substitute_path_command (const char *args, int from_tty)
{
- char **argv;
struct substitute_path_rule *rule;
- argv = gdb_buildargv (args);
- make_cleanup_freeargv (argv);
+ gdb_argv argv (args);
if (argv == NULL || argv[0] == NULL || argv [1] == NULL)
error (_("Incorrect usage, too few arguments in command"));
forget_cached_source_info ();
}
+/* See source.h. */
+
+source_lines_range::source_lines_range (int startline,
+ source_lines_range::direction dir)
+{
+ if (dir == source_lines_range::FORWARD)
+ {
+ LONGEST end = static_cast <LONGEST> (startline) + get_lines_to_list ();
+
+ if (end > INT_MAX)
+ end = INT_MAX;
+
+ m_startline = startline;
+ m_stopline = static_cast <int> (end);
+ }
+ else
+ {
+ LONGEST start = static_cast <LONGEST> (startline) - get_lines_to_list ();
+
+ if (start < 1)
+ start = 1;
+
+ m_startline = static_cast <int> (start);
+ m_stopline = startline;
+ }
+}
+
\f
void
_initialize_source (void)
show_directories_command,
&setlist, &showlist);
- if (xdb_commands)
- {
- add_com_alias ("D", "directory", class_files, 0);
- add_cmd ("ld", no_class, show_directories_1, _("\
-Current search path for finding source files.\n\
-$cwd in the path means the current working directory.\n\
-$cdir in the path means the compilation directory of the source file."),
- &cmdlist);
- }
-
- add_info ("source", source_info,
+ add_info ("source", info_source_command,
_("Information about the current source file."));
- add_info ("line", line_info, _("\
+ add_info ("line", info_line_command, _("\
Core addresses of the code for a source line.\n\
Line can be specified as\n\
LINENUM, to list around that line in current file,\n\
The matching line number is also stored as the value of \"$_\"."));
add_com_alias ("rev", "reverse-search", class_files, 1);
- if (xdb_commands)
- {
- add_com_alias ("/", "forward-search", class_files, 0);
- add_com_alias ("?", "reverse-search", class_files, 0);
- }
-
add_setshow_integer_cmd ("listsize", class_support, &lines_to_list, _("\
Set number of source lines gdb will list by default."), _("\
-Show number of source lines gdb will list by default."), NULL,
+Show number of source lines gdb will list by default."), _("\
+Use this to choose how many source lines the \"list\" displays (unless\n\
+the \"list\" argument explicitly specifies some other number).\n\
+A value of \"unlimited\", or zero, means there's no limit."),
NULL,
show_lines_to_list,
&setlist, &showlist);