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authorK. Richard Pixley <rich@cygnus>1991-03-28 16:26:26 +0000
committerK. Richard Pixley <rich@cygnus>1991-03-28 16:26:26 +0000
commitbd5635a1e2b38ee8432fcdaa6456079191375277 (patch)
treeffc4c35618c4b6af001f38247ed0d1c05c7a35ad /gdb/source.c
parent5a131cc7f0469e0375872605593e4a9c5d1eaefb (diff)
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Initial revision
Diffstat (limited to 'gdb/source.c')
-rw-r--r--gdb/source.c1186
1 files changed, 1186 insertions, 0 deletions
diff --git a/gdb/source.c b/gdb/source.c
new file mode 100644
index 0000000..ebc7041
--- /dev/null
+++ b/gdb/source.c
@@ -0,0 +1,1186 @@
+/* List lines of source files for GDB, the GNU debugger.
+ Copyright (C) 1986, 1987, 1988, 1989, 1991 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GDB is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <stdio.h>
+#include "defs.h"
+#include "symtab.h"
+#include "param.h"
+#include "command.h"
+#include "frame.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <string.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include "gdbcore.h"
+
+extern char *strstr();
+
+extern void set_next_address ();
+
+void mod_path ();
+
+/* Path of directories to search for source files.
+ Same format as the PATH environment variable's value. */
+
+char *source_path;
+
+/* Symtab of default file for listing lines of. */
+
+struct symtab *current_source_symtab;
+
+/* Default next line to list. */
+
+int current_source_line;
+
+/* Line number of last line printed. Default for various commands.
+ current_source_line is usually, but not always, the same as this. */
+
+static int last_line_listed;
+
+/* First line number listed by last listing command. */
+
+static int first_line_listed;
+
+
+/* Set the source file default for the "list" command, specifying a
+ symtab. Sigh. Behavior specification: If it is called with a
+ non-zero argument, that is the symtab to select. If it is not,
+ first lookup "main"; if it exists, use the symtab and line it
+ defines. If not, take the last symtab in the symtab_list (if it
+ exists) or the last symtab in the psymtab_list (if *it* exists). If
+ none of this works, report an error. */
+
+void
+select_source_symtab (s)
+ register struct symtab *s;
+{
+ struct symtabs_and_lines sals;
+ struct symtab_and_line sal;
+ struct partial_symtab *ps;
+ struct partial_symtab *cs_pst = 0;
+
+ if (s)
+ {
+ current_source_symtab = s;
+ current_source_line = 1;
+ return;
+ }
+
+ /* Make the default place to list be the function `main'
+ if one exists. */
+ if (lookup_symbol ("main", 0, VAR_NAMESPACE, 0, NULL))
+ {
+ sals = decode_line_spec ("main", 1);
+ sal = sals.sals[0];
+ free (sals.sals);
+ current_source_symtab = sal.symtab;
+ current_source_line = max (sal.line - (lines_to_list () - 1), 1);
+ return;
+ }
+
+ /* All right; find the last file in the symtab list (ignoring .h's). */
+
+ if (s = symtab_list)
+ {
+ do
+ {
+ char *name = s->filename;
+ int len = strlen (name);
+ if (! (len > 2 && !strcmp (&name[len - 2], ".h")))
+ current_source_symtab = s;
+ s = s->next;
+ }
+ while (s);
+ current_source_line = 1;
+ }
+ else if (partial_symtab_list)
+ {
+ ps = partial_symtab_list;
+ while (ps)
+ {
+ char *name = ps->filename;
+ int len = strlen (name);
+ if (! (len > 2 && !strcmp (&name[len - 2], ".h")))
+ cs_pst = ps;
+ ps = ps->next;
+ }
+ if (cs_pst)
+ if (cs_pst->readin)
+ fatal ("Internal: select_source_symtab: readin pst found and no symtabs.");
+ else
+ current_source_symtab = PSYMTAB_TO_SYMTAB (cs_pst);
+ else
+ current_source_symtab = 0;
+ current_source_line = 1;
+ }
+}
+
+static void
+directories_info ()
+{
+ printf ("Source directories searched: %s\n", source_path);
+}
+
+/* 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. */
+
+void
+forget_cached_source_info ()
+{
+ register struct symtab *s;
+
+ for (s = symtab_list; s; s = s->next)
+ {
+ if (s->line_charpos != 0)
+ {
+ free (s->line_charpos);
+ s->line_charpos = 0;
+ }
+ if (s->fullname != 0)
+ {
+ free (s->fullname);
+ s->fullname = 0;
+ }
+ }
+}
+
+void
+init_source_path ()
+{
+ source_path = savestring ("$cdir:$cwd", /* strlen of it */ 10);
+ forget_cached_source_info ();
+}
+
+/* Add zero or more directories to the front of the source path. */
+
+void
+directory_command (dirname, from_tty)
+ char *dirname;
+ int from_tty;
+{
+ dont_repeat ();
+ /* FIXME, this goes to "delete dir"... */
+ if (dirname == 0)
+ {
+ if (query ("Reinitialize source path to empty? ", ""))
+ {
+ free (source_path);
+ init_source_path ();
+ }
+ }
+ else
+ mod_path (dirname, from_tty, &source_path);
+ if (from_tty)
+ directories_info ();
+ forget_cached_source_info ();
+}
+
+/* Add zero or more directories to the front of an arbitrary path. */
+
+void
+mod_path (dirname, from_tty, which_path)
+ char *dirname;
+ int from_tty;
+ char **which_path;
+{
+ char *old = *which_path;
+ int prefix = 0;
+
+ if (dirname == 0)
+ return;
+
+ dirname = strsave (dirname);
+ make_cleanup (free, dirname);
+
+ do
+ {
+ extern char *index ();
+ char *name = dirname;
+ register char *p;
+ struct stat st;
+
+ {
+ char *colon = index (name, ':');
+ char *space = index (name, ' ');
+ char *tab = index (name, '\t');
+ if (colon == 0 && space == 0 && tab == 0)
+ p = dirname = name + strlen (name);
+ else
+ {
+ p = 0;
+ if (colon != 0 && (p == 0 || colon < p))
+ p = colon;
+ if (space != 0 && (p == 0 || space < p))
+ p = space;
+ if (tab != 0 && (p == 0 || tab < p))
+ p = tab;
+ dirname = p + 1;
+ while (*dirname == ':' || *dirname == ' ' || *dirname == '\t')
+ ++dirname;
+ }
+ }
+
+ if (p[-1] == '/')
+ /* Sigh. "foo/" => "foo" */
+ --p;
+ *p = '\0';
+
+ while (p[-1] == '.')
+ {
+ if (p - name == 1)
+ {
+ /* "." => getwd (). */
+ name = current_directory;
+ goto append;
+ }
+ else if (p[-2] == '/')
+ {
+ if (p - name == 2)
+ {
+ /* "/." => "/". */
+ *--p = '\0';
+ goto append;
+ }
+ else
+ {
+ /* "...foo/." => "...foo". */
+ p -= 2;
+ *p = '\0';
+ continue;
+ }
+ }
+ else
+ break;
+ }
+
+ if (name[0] == '~')
+ name = tilde_expand (name);
+ else if (name[0] != '/' && name[0] != '$')
+ name = concat (current_directory, "/", name);
+ else
+ name = savestring (name, p - name);
+ make_cleanup (free, name);
+
+ /* Unless it's a variable, check existence. */
+ if (name[0] != '$') {
+ if (stat (name, &st) < 0)
+ perror_with_name (name);
+ if ((st.st_mode & S_IFMT) != S_IFDIR)
+ error ("%s is not a directory.", name);
+ }
+
+ append:
+ {
+ register unsigned int len = strlen (name);
+
+ p = *which_path;
+ while (1)
+ {
+ if (!strncmp (p, name, len)
+ && (p[len] == '\0' || p[len] == ':'))
+ {
+ /* Found it in the search path, remove old copy */
+ if (p > *which_path)
+ p--; /* Back over leading colon */
+ if (prefix > p - *which_path)
+ goto skip_dup; /* Same dir twice in one cmd */
+ strcpy (p, &p[len+1]); /* Copy from next \0 or : */
+ }
+ p = index (p, ':');
+ if (p != 0)
+ ++p;
+ else
+ break;
+ }
+ if (p == 0)
+ {
+ /* If we have already tacked on a name(s) in this command, be sure they stay on the front as we tack on some more. */
+ if (prefix)
+ {
+ char *temp, c;
+
+ c = old[prefix];
+ old[prefix] = '\0';
+ temp = concat (old, ":", name);
+ old[prefix] = c;
+ *which_path = concat (temp, "", &old[prefix]);
+ prefix = strlen (temp);
+ free (temp);
+ }
+ else
+ {
+ *which_path = concat (name, (old[0]? ":" : old), old);
+ prefix = strlen (name);
+ }
+ free (old);
+ old = *which_path;
+ }
+ }
+ skip_dup: ;
+ } while (*dirname != '\0');
+}
+
+
+static void
+source_info ()
+{
+ register struct symtab *s = current_source_symtab;
+
+ if (!s)
+ {
+ printf("No current source file.\n");
+ return;
+ }
+ printf ("Current source file is %s\n", s->filename);
+ if (s->dirname)
+ printf ("Compilation directory is %s\n", s->dirname);
+ if (s->fullname)
+ printf ("Located in %s\n", s->fullname);
+ if (s->nlines)
+ printf ("Contains %d lines\n", s->nlines);
+
+ switch (s->language) {
+ case language_c:
+ printf("Written in the C language.\n");
+ /* Add more cases here when -Wswitch complains... */
+ case language_unknown:
+ break;
+ }
+}
+
+
+
+/* Open a file named STRING, searching path PATH (dir names sep by colons)
+ using mode MODE and protection bits PROT in the calls to open.
+ If TRY_CWD_FIRST, try to open ./STRING before searching PATH.
+ (ie pretend the first element of PATH is ".")
+ If FILENAMED_OPENED is non-null, set it to a newly allocated string naming
+ the actual file opened (this string will always start with a "/". We
+ have to take special pains to avoid doubling the "/" between the directory
+ and the file, sigh! Emacs gets confuzzed by this when we print the
+ source file name!!!
+
+ 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 (path, try_cwd_first, string, mode, prot, filename_opened)
+ char *path;
+ int try_cwd_first;
+ char *string;
+ int mode;
+ int prot;
+ char **filename_opened;
+{
+ register int fd;
+ register char *filename;
+ register char *p, *p1;
+ register int len;
+ int alloclen;
+
+ if (!path)
+ path = ".";
+
+ /* ./foo => foo */
+ while (string[0] == '.' && string[1] == '/')
+ string += 2;
+
+ if (try_cwd_first || string[0] == '/')
+ {
+ filename = string;
+ fd = open (filename, mode, prot);
+ if (fd >= 0 || string[0] == '/')
+ goto done;
+ }
+
+ alloclen = strlen (path) + strlen (string) + 2;
+ filename = (char *) alloca (alloclen);
+ fd = -1;
+ for (p = path; p; p = p1 ? p1 + 1 : 0)
+ {
+ p1 = (char *) index (p, ':');
+ if (p1)
+ len = p1 - p;
+ else
+ len = strlen (p);
+
+ if (len == 4 && p[0] == '$' && p[1] == 'c'
+ && p[2] == 'w' && p[3] == 'd') {
+ /* Name is $cwd -- insert current directory name instead. */
+ int newlen;
+
+ /* First, realloc the filename buffer if too short. */
+ len = strlen (current_directory);
+ newlen = len + strlen (string) + 2;
+ if (newlen > alloclen) {
+ alloclen = newlen;
+ filename = (char *) alloca (alloclen);
+ }
+ strcpy (filename, current_directory);
+ } else {
+ /* Normal file name in path -- just use it. */
+ strncpy (filename, p, len);
+ filename[len] = 0;
+ }
+
+ /* Beware the // my son, the Emacs barfs, the botch that catch... */
+ while (len > 1 && filename[len-1] == '/')
+ filename[--len] = 0;
+ strcat (filename+len, "/");
+ strcat (filename, string);
+
+ fd = open (filename, mode, prot);
+ if (fd >= 0) break;
+ }
+
+ done:
+ if (filename_opened)
+ if (fd < 0)
+ *filename_opened = (char *) 0;
+ else if (filename[0] == '/')
+ *filename_opened = savestring (filename, strlen (filename));
+ else
+ {
+ /* Beware the // my son, the Emacs barfs, the botch that catch... */
+
+ *filename_opened = concat (current_directory,
+ '/' == current_directory[strlen(current_directory)-1]? "": "/",
+ filename);
+ }
+
+ return fd;
+}
+
+/* Open a source file given a symtab S. Returns a file descriptor
+ or negative number for error. */
+int
+open_source_file (s)
+ struct symtab *s;
+{
+ char *path = source_path;
+ char *p;
+ int result;
+
+ /* Quick way out if we already know its full name */
+ if (s->fullname)
+ {
+ result = open (s->fullname, O_RDONLY);
+ if (result >= 0)
+ return result;
+ /* Didn't work -- free old one, try again. */
+ free (s->fullname);
+ s->fullname = NULL;
+ }
+
+ if (s->dirname != NULL)
+ {
+ /* Replace a path entry of $cdir with the compilation directory name */
+#define cdir_len 5
+ p = strstr (source_path, "$cdir");
+ if (p && (p == path || p[-1] == ':')
+ && (p[cdir_len] == ':' || p[cdir_len] == '\0')) {
+ int len;
+
+ path = (char *)
+ alloca (strlen (source_path) + 1 + strlen (s->dirname) + 1);
+ len = p - source_path;
+ strncpy (path, source_path, len); /* Before $cdir */
+ strcpy (path + len, s->dirname); /* new stuff */
+ strcat (path + len, source_path + len + cdir_len); /* After $cdir */
+ }
+ }
+
+ return openp (path, 0, s->filename, O_RDONLY, 0, &s->fullname);
+}
+
+
+/* Create and initialize the table S->line_charpos that records
+ the positions of the lines in the source file, which is assumed
+ to be open on descriptor DESC.
+ All set S->nlines to the number of such lines. */
+
+static void
+find_source_lines (s, desc)
+ struct symtab *s;
+ int desc;
+{
+ struct stat st;
+ register char *data, *p, *end;
+ int nlines = 0;
+ int lines_allocated = 1000;
+ int *line_charpos = (int *) xmalloc (lines_allocated * sizeof (int));
+
+ if (fstat (desc, &st) < 0)
+ perror_with_name (s->filename);
+ if (exec_bfd && bfd_get_mtime(exec_bfd) < st.st_mtime)
+ printf ("Source file is more recent than executable.\n");
+
+#if defined (BROKEN_LARGE_ALLOCA)
+ data = (char *) xmalloc (st.st_size);
+ make_cleanup (free, data);
+#else
+ data = (char *) alloca (st.st_size);
+#endif
+ if (myread (desc, data, st.st_size) < 0)
+ perror_with_name (s->filename);
+ end = data + st.st_size;
+ p = data;
+ line_charpos[0] = 0;
+ nlines = 1;
+ while (p != end)
+ {
+ if (*p++ == '\n'
+ /* A newline at the end does not start a new line. */
+ && p != end)
+ {
+ if (nlines == lines_allocated)
+ {
+ lines_allocated *= 2;
+ line_charpos = (int *) xrealloc (line_charpos,
+ sizeof (int) * lines_allocated);
+ }
+ line_charpos[nlines++] = p - data;
+ }
+ }
+ s->nlines = nlines;
+ s->line_charpos = (int *) xrealloc (line_charpos, nlines * sizeof (int));
+}
+
+/* Return the character position of a line LINE in symtab S.
+ Return 0 if anything is invalid. */
+
+int
+source_line_charpos (s, line)
+ struct symtab *s;
+ int line;
+{
+ if (!s) return 0;
+ if (!s->line_charpos || line <= 0) return 0;
+ if (line > s->nlines)
+ line = s->nlines;
+ return s->line_charpos[line - 1];
+}
+
+/* Return the line number of character position POS in symtab S. */
+
+int
+source_charpos_line (s, chr)
+ register struct symtab *s;
+ register int chr;
+{
+ register int line = 0;
+ register int *lnp;
+
+ if (s == 0 || s->line_charpos == 0) return 0;
+ lnp = s->line_charpos;
+ /* Files are usually short, so sequential search is Ok */
+ while (line < s->nlines && *lnp <= chr)
+ {
+ line++;
+ lnp++;
+ }
+ if (line >= s->nlines)
+ line = s->nlines;
+ return line;
+}
+
+/* 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. */
+
+int
+get_filename_and_charpos (s, fullname)
+ struct symtab *s;
+ char **fullname;
+{
+ register int desc, linenums_changed = 0;
+
+ desc = open_source_file (s);
+ if (desc < 0)
+ {
+ if (fullname)
+ *fullname = NULL;
+ return 0;
+ }
+ if (fullname)
+ *fullname = s->fullname;
+ if (s->line_charpos == 0) linenums_changed = 1;
+ if (linenums_changed) find_source_lines (s, desc);
+ close (desc);
+ return linenums_changed;
+}
+
+/* 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. */
+
+int
+identify_source_line (s, line, mid_statement)
+ struct symtab *s;
+ int line;
+ int mid_statement;
+{
+ if (s->line_charpos == 0)
+ get_filename_and_charpos (s, (char **)NULL);
+ if (s->fullname == 0)
+ return 0;
+ printf ("\032\032%s:%d:%d:%s:0x%x\n", s->fullname,
+ line, s->line_charpos[line - 1],
+ mid_statement ? "middle" : "beg",
+ get_frame_pc (get_current_frame()));
+ current_source_line = line;
+ first_line_listed = line;
+ last_line_listed = line;
+ current_source_symtab = s;
+ return 1;
+}
+
+/* Print source lines from the file of symtab S,
+ starting with line number LINE and stopping before line number STOPLINE. */
+
+void
+print_source_lines (s, line, stopline, noerror)
+ struct symtab *s;
+ int line, stopline;
+ int noerror;
+{
+ register int c;
+ register int desc;
+ register FILE *stream;
+ int nlines = stopline - line;
+
+ /* Regardless of whether we can open the file, set current_source_symtab. */
+ current_source_symtab = s;
+ current_source_line = line;
+ first_line_listed = line;
+
+ desc = open_source_file (s);
+ if (desc < 0)
+ {
+ if (! noerror) {
+ char *name = alloca (strlen (s->filename) + 100);
+ sprintf (name, "%s:%d", s->filename, line);
+ print_sys_errmsg (name, errno);
+ }
+ return;
+ }
+
+ 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, s->filename, s->nlines);
+ }
+
+ if (lseek (desc, s->line_charpos[line - 1], 0) < 0)
+ {
+ close (desc);
+ perror_with_name (s->filename);
+ }
+
+ stream = fdopen (desc, "r");
+ clearerr (stream);
+
+ while (nlines-- > 0)
+ {
+ c = fgetc (stream);
+ if (c == EOF) break;
+ last_line_listed = current_source_line;
+ printf_filtered ("%d\t", current_source_line++);
+ do
+ {
+ if (c < 040 && c != '\t' && c != '\n')
+ printf_filtered ("^%c", c + 0100);
+ else if (c == 0177)
+ printf_filtered ("^?");
+ else
+ printf_filtered ("%c", c);
+ } while (c != '\n' && (c = fgetc (stream)) >= 0);
+ }
+
+ fclose (stream);
+}
+
+
+
+/*
+ C++
+ Print a list of files and line numbers which a user may choose from
+ in order to list a function which was specified ambiguously
+ (as with `list classname::overloadedfuncname', for example).
+ The vector in SALS provides the filenames and line numbers.
+ */
+static void
+ambiguous_line_spec (sals)
+ struct symtabs_and_lines *sals;
+{
+ int i;
+
+ for (i = 0; i < sals->nelts; ++i)
+ printf("file: \"%s\", line number: %d\n",
+ sals->sals[i].symtab->filename, sals->sals[i].line);
+}
+
+
+static void
+list_command (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ struct symtabs_and_lines sals, sals_end;
+ struct symtab_and_line sal, sal_end;
+ struct symbol *sym;
+ char *arg1;
+ int no_end = 1;
+ int dummy_end = 0;
+ int dummy_beg = 0;
+ int linenum_beg = 0;
+ char *p;
+
+ if (symtab_list == 0 && partial_symtab_list == 0)
+ error ("No symbol table is loaded. Use the \"symbol-file\" command.");
+
+ /* Pull in a current source symtab if necessary */
+ if (current_source_symtab == 0 &&
+ (arg == 0 || arg[0] == '+' || arg[0] == '-'))
+ select_source_symtab (0);
+
+ /* "l" or "l +" lists next ten lines. */
+
+ if (arg == 0 || !strcmp (arg, "+"))
+ {
+ if (current_source_symtab == 0)
+ error ("No default source file yet. Do \"help list\".");
+ print_source_lines (current_source_symtab, current_source_line,
+ current_source_line + lines_to_list (), 0);
+ return;
+ }
+
+ /* "l -" lists previous ten lines, the ones before the ten just listed. */
+ if (!strcmp (arg, "-"))
+ {
+ if (current_source_symtab == 0)
+ error ("No default source file yet. Do \"help list\".");
+ print_source_lines (current_source_symtab,
+ max (first_line_listed - lines_to_list (), 1),
+ first_line_listed, 0);
+ return;
+ }
+
+ /* Now if there is only one argument, decode it in SAL
+ and set NO_END.
+ If there are two arguments, decode them in SAL and SAL_END
+ and clear NO_END; however, if one of the arguments is blank,
+ set DUMMY_BEG or DUMMY_END to record that fact. */
+
+ arg1 = arg;
+ if (*arg1 == ',')
+ dummy_beg = 1;
+ else
+ {
+ sals = decode_line_1 (&arg1, 0, 0, 0);
+
+ if (! sals.nelts) return; /* C++ */
+ if (sals.nelts > 1)
+ {
+ ambiguous_line_spec (&sals);
+ free (sals.sals);
+ return;
+ }
+
+ sal = sals.sals[0];
+ free (sals.sals);
+ }
+
+ /* Record whether the BEG arg is all digits. */
+
+ for (p = arg; p != arg1 && *p >= '0' && *p <= '9'; p++);
+ linenum_beg = (p == arg1);
+
+ while (*arg1 == ' ' || *arg1 == '\t')
+ arg1++;
+ if (*arg1 == ',')
+ {
+ no_end = 0;
+ arg1++;
+ while (*arg1 == ' ' || *arg1 == '\t')
+ arg1++;
+ if (*arg1 == 0)
+ dummy_end = 1;
+ else
+ {
+ if (dummy_beg)
+ sals_end = decode_line_1 (&arg1, 0, 0, 0);
+ else
+ sals_end = decode_line_1 (&arg1, 0, sal.symtab, sal.line);
+ if (sals_end.nelts == 0)
+ return;
+ if (sals_end.nelts > 1)
+ {
+ ambiguous_line_spec (&sals_end);
+ free (sals_end.sals);
+ return;
+ }
+ sal_end = sals_end.sals[0];
+ free (sals_end.sals);
+ }
+ }
+
+ if (*arg1)
+ error ("Junk at end of line specification.");
+
+ if (!no_end && !dummy_beg && !dummy_end
+ && sal.symtab != sal_end.symtab)
+ error ("Specified start and end are in different files.");
+ if (dummy_beg && dummy_end)
+ error ("Two empty args do not say what lines to list.");
+
+ /* if line was specified by address,
+ first print exactly which line, and which file.
+ In this case, sal.symtab == 0 means address is outside
+ of all known source files, not that user failed to give a filename. */
+ if (*arg == '*')
+ {
+ if (sal.symtab == 0)
+ error ("No source file for address 0x%x.", sal.pc);
+ sym = find_pc_function (sal.pc);
+ if (sym)
+ printf ("0x%x is in %s (%s, line %d).\n",
+ sal.pc, SYMBOL_NAME (sym), sal.symtab->filename, sal.line);
+ else
+ printf ("0x%x is in %s, line %d.\n",
+ sal.pc, sal.symtab->filename, sal.line);
+ }
+
+ /* If line was not specified by just a line number,
+ and it does not imply a symtab, it must be an undebuggable symbol
+ which means no source code. */
+
+ if (! linenum_beg && sal.symtab == 0)
+ error ("No line number known for %s.", arg);
+
+ /* If this command is repeated with RET,
+ turn it into the no-arg variant. */
+
+ if (from_tty)
+ *arg = 0;
+
+ if (dummy_beg && sal_end.symtab == 0)
+ error ("No default source file yet. Do \"help list\".");
+ if (dummy_beg)
+ print_source_lines (sal_end.symtab,
+ max (sal_end.line - (lines_to_list () - 1), 1),
+ sal_end.line + 1, 0);
+ else if (sal.symtab == 0)
+ error ("No default source file yet. Do \"help list\".");
+ else if (no_end)
+ print_source_lines (sal.symtab,
+ max (sal.line - (lines_to_list () / 2), 1),
+ sal.line + 5, 0);
+ else
+ print_source_lines (sal.symtab, sal.line,
+ (dummy_end
+ ? sal.line + lines_to_list ()
+ : sal_end.line + 1),
+ 0);
+}
+
+/* Print info on range of pc's in a specified line. */
+
+static void
+line_info (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ struct symtabs_and_lines sals;
+ struct symtab_and_line sal;
+ CORE_ADDR start_pc, end_pc;
+ int i;
+
+ if (arg == 0)
+ {
+ sal.symtab = current_source_symtab;
+ sal.line = last_line_listed;
+ sals.nelts = 1;
+ sals.sals = (struct symtab_and_line *)
+ xmalloc (sizeof (struct symtab_and_line));
+ sals.sals[0] = sal;
+ }
+ else
+ {
+ sals = decode_line_spec_1 (arg, 0);
+
+ /* If this command is repeated with RET,
+ turn it into the no-arg variant. */
+ if (from_tty)
+ *arg = 0;
+ }
+
+ /* 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++)
+ {
+ sal = sals.sals[i];
+
+ if (sal.symtab == 0)
+ error ("No source file specified.");
+
+ if (sal.line > 0
+ && find_line_pc_range (sal.symtab, sal.line, &start_pc, &end_pc))
+ {
+ if (start_pc == end_pc)
+ printf ("Line %d of \"%s\" is at pc 0x%x but contains no code.\n",
+ sal.line, sal.symtab->filename, start_pc);
+ else
+ printf ("Line %d of \"%s\" starts at pc 0x%x and ends at 0x%x.\n",
+ sal.line, sal.symtab->filename, start_pc, end_pc);
+ /* x/i should display this line's code. */
+ set_next_address (start_pc);
+ /* Repeating "info line" should do the following line. */
+ last_line_listed = sal.line + 1;
+ }
+ else
+ printf ("Line number %d is out of range for \"%s\".\n",
+ sal.line, sal.symtab->filename);
+ }
+}
+
+/* Commands to search the source file for a regexp. */
+
+static void
+forward_search_command (regex, from_tty)
+ char *regex;
+ int from_tty;
+{
+ register int c;
+ register int desc;
+ register FILE *stream;
+ int line = last_line_listed + 1;
+ char *msg;
+
+ msg = (char *) re_comp (regex);
+ if (msg)
+ error (msg);
+
+ if (current_source_symtab == 0)
+ select_source_symtab (0);
+
+ /* Search from last_line_listed+1 in current_source_symtab */
+
+ desc = open_source_file (current_source_symtab);
+ if (desc < 0)
+ perror_with_name (current_source_symtab->filename);
+
+ if (current_source_symtab->line_charpos == 0)
+ find_source_lines (current_source_symtab, desc);
+
+ if (line < 1 || line > current_source_symtab->nlines)
+ {
+ close (desc);
+ error ("Expression not found");
+ }
+
+ if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0)
+ {
+ close (desc);
+ perror_with_name (current_source_symtab->filename);
+ }
+
+ stream = fdopen (desc, "r");
+ clearerr (stream);
+ while (1) {
+ char buf[4096]; /* Should be reasonable??? */
+ register char *p = buf;
+
+ c = fgetc (stream);
+ if (c == EOF)
+ break;
+ do {
+ *p++ = c;
+ } while (c != '\n' && (c = fgetc (stream)) >= 0);
+
+ /* we now have a source line in buf, null terminate and match */
+ *p = 0;
+ if (re_exec (buf) > 0)
+ {
+ /* Match! */
+ fclose (stream);
+ print_source_lines (current_source_symtab,
+ line, line+1, 0);
+ current_source_line = max (line - lines_to_list () / 2, 1);
+ return;
+ }
+ line++;
+ }
+
+ printf ("Expression not found\n");
+ fclose (stream);
+}
+
+static void
+reverse_search_command (regex, from_tty)
+ char *regex;
+ int from_tty;
+{
+ register int c;
+ register int desc;
+ register FILE *stream;
+ int line = last_line_listed - 1;
+ char *msg;
+
+ msg = (char *) re_comp (regex);
+ if (msg)
+ error (msg);
+
+ if (current_source_symtab == 0)
+ select_source_symtab (0);
+
+ /* Search from last_line_listed-1 in current_source_symtab */
+
+ desc = open_source_file (current_source_symtab);
+ if (desc < 0)
+ perror_with_name (current_source_symtab->filename);
+
+ if (current_source_symtab->line_charpos == 0)
+ find_source_lines (current_source_symtab, desc);
+
+ if (line < 1 || line > current_source_symtab->nlines)
+ {
+ close (desc);
+ error ("Expression not found");
+ }
+
+ if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0)
+ {
+ close (desc);
+ perror_with_name (current_source_symtab->filename);
+ }
+
+ stream = fdopen (desc, "r");
+ clearerr (stream);
+ while (line > 1)
+ {
+ char buf[4096]; /* Should be reasonable??? */
+ register char *p = buf;
+
+ c = fgetc (stream);
+ if (c == EOF)
+ break;
+ do {
+ *p++ = c;
+ } while (c != '\n' && (c = fgetc (stream)) >= 0);
+
+ /* We now have a source line in buf; null terminate and match. */
+ *p = 0;
+ if (re_exec (buf) > 0)
+ {
+ /* Match! */
+ fclose (stream);
+ print_source_lines (current_source_symtab,
+ line, line+1, 0);
+ current_source_line = max (line - lines_to_list () / 2, 1);
+ return;
+ }
+ line--;
+ if (fseek (stream, current_source_symtab->line_charpos[line - 1], 0) < 0)
+ {
+ fclose (stream);
+ perror_with_name (current_source_symtab->filename);
+ }
+ }
+
+ printf ("Expression not found\n");
+ fclose (stream);
+ return;
+}
+
+void
+_initialize_source ()
+{
+ current_source_symtab = 0;
+ init_source_path ();
+
+ add_com ("directory", class_files, directory_command,
+ "Add directory DIR to beginning of search path for source files.\n\
+Forget cached info on source file locations and line positions.\n\
+DIR can also be $cwd for the current working directory, or $cdir for the\n\
+directory in which the source file was compiled into object code.\n\
+With no argument, reset the search path to $cdir:$cwd, the default.");
+
+ add_info ("directories", directories_info,
+ "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.");
+
+ add_info ("source", source_info,
+ "Information about the current source file.");
+
+ add_info ("line", line_info,
+ "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\
+ FILE:LINENUM, to list around that line in that file,\n\
+ FUNCTION, to list around beginning of that function,\n\
+ FILE:FUNCTION, to distinguish among like-named static functions.\n\
+Default is to describe the last source line that was listed.\n\n\
+This sets the default address for \"x\" to the line's first instruction\n\
+so that \"x/i\" suffices to start examining the machine code.\n\
+The address is also stored as the value of \"$_\".");
+
+ add_com ("forward-search", class_files, forward_search_command,
+ "Search for regular expression (see regex(3)) from last line listed.");
+ add_com_alias ("search", "forward-search", class_files, 0);
+
+ add_com ("reverse-search", class_files, reverse_search_command,
+ "Search backward for regular expression (see regex(3)) from last line listed.");
+
+ add_com ("list", class_files, list_command,
+ "List specified function or line.\n\
+With no argument, lists ten more lines after or around previous listing.\n\
+\"list -\" lists the ten lines before a previous ten-line listing.\n\
+One argument specifies a line, and ten lines are listed around that line.\n\
+Two arguments with comma between specify starting and ending lines to list.\n\
+Lines can be specified in these ways:\n\
+ LINENUM, to list around that line in current file,\n\
+ FILE:LINENUM, to list around that line in that file,\n\
+ FUNCTION, to list around beginning of that function,\n\
+ FILE:FUNCTION, to distinguish among like-named static functions.\n\
+ *ADDRESS, to list around the line containing that address.\n\
+With two args if one is empty it stands for ten lines away from the other arg.");
+ add_com_alias ("l", "list", class_files, 0);
+}
+