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Diffstat (limited to 'gdb/source.c')
| -rw-r--r-- | gdb/source.c | 1186 |
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); +} + |