diff options
Diffstat (limited to 'gdb/source.c')
| -rw-r--r-- | gdb/source.c | 1724 |
1 files changed, 1724 insertions, 0 deletions
diff --git a/gdb/source.c b/gdb/source.c new file mode 100644 index 00000000000..9fe97425aa4 --- /dev/null +++ b/gdb/source.c @@ -0,0 +1,1724 @@ +/* List lines of source files for GDB, the GNU debugger. + Copyright 1986, 87, 88, 89, 91, 92, 93, 94, 95, 96, 97, 1998 + Free Software Foundation, Inc. + +This file is part of GDB. + +This program 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 2 of the License, or +(at your option) any later version. + +This program 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 this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "symtab.h" +#include "expression.h" +#include "language.h" +#include "command.h" +#include "gdbcmd.h" +#include "frame.h" +#include "value.h" + +#include <sys/types.h> +#include "gdb_string.h" +#include "gdb_stat.h" +#include <fcntl.h> +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif +#include "gdbcore.h" +#include "gnu-regex.h" +#include "symfile.h" +#include "objfiles.h" +#include "annotate.h" +#include "gdbtypes.h" + +#ifdef CRLF_SOURCE_FILES + +/* Define CRLF_SOURCE_FILES in an xm-*.h file if source files on the + host use \r\n rather than just \n. Defining CRLF_SOURCE_FILES is + much faster than defining LSEEK_NOT_LINEAR. */ + +#ifndef O_BINARY +#define O_BINARY 0 +#endif + +#define OPEN_MODE (O_RDONLY | O_BINARY) +#define FDOPEN_MODE FOPEN_RB + +#else /* ! defined (CRLF_SOURCE_FILES) */ + +#define OPEN_MODE O_RDONLY +#define FDOPEN_MODE FOPEN_RT + +#endif /* ! defined (CRLF_SOURCE_FILES) */ + +/* Forward declarations */ + +int open_source_file PARAMS ((struct symtab *)); + +void find_source_lines PARAMS ((struct symtab *, int)); + +/* Prototypes for exported functions. */ + +void _initialize_source PARAMS ((void)); + +/* Prototypes for local functions. */ + +static int get_filename_and_charpos PARAMS ((struct symtab *, char **)); + +static void reverse_search_command PARAMS ((char *, int)); + +static void forward_search_command PARAMS ((char *, int)); + +static void line_info PARAMS ((char *, int)); + +static void list_command PARAMS ((char *, int)); + +static void ambiguous_line_spec PARAMS ((struct symtabs_and_lines *)); + +static void source_info PARAMS ((char *, int)); + +static void show_directories PARAMS ((char *, int)); + +/* 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; + +/* Default number of lines to print with commands like "list". + This is based on guessing how many long (i.e. more than chars_per_line + characters) lines there will be. To be completely correct, "list" + 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; + +/* 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; + +/* Saves the name of the last source file visited and a possible error code. + Used to prevent repeating annoying "No such file or directories" msgs */ + +static struct symtab *last_source_visited = NULL; +static int last_source_error = 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. */ + +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; + struct objfile *ofp; + + if (s) + { + current_source_symtab = s; + current_source_line = 1; + return; + } + + if (current_source_symtab) + 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); + if (current_source_symtab) + return; + } + + /* All right; find the last file in the symtab list (ignoring .h's). */ + + current_source_line = 1; + + for (ofp = object_files; ofp != NULL; ofp = ofp -> next) + { + for (s = ofp -> symtabs; s; s = s->next) + { + char *name = s -> filename; + int len = strlen (name); + if (! (len > 2 && (STREQ (&name[len - 2], ".h")))) + { + current_source_symtab = s; + } + } + } + if (current_source_symtab) + return; + + /* Howabout the partial symbol tables? */ + + for (ofp = object_files; ofp != NULL; ofp = ofp -> next) + { + for (ps = ofp -> psymtabs; ps != NULL; ps = ps -> next) + { + char *name = ps -> filename; + int len = strlen (name); + if (! (len > 2 && (STREQ (&name[len - 2], ".h")))) + { + cs_pst = ps; + } + } + } + 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); + } + } + if (current_source_symtab) + return; + + error ("Can't find a default source file"); +} + +static void +show_directories (ignore, from_tty) + char *ignore; + int from_tty; +{ + puts_filtered ("Source directories searched: "); + puts_filtered (source_path); + puts_filtered ("\n"); +} + +/* 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; + register struct objfile *objfile; + + for (objfile = object_files; objfile != NULL; objfile = objfile -> next) + { + for (s = objfile -> symtabs; s != NULL; s = s -> next) + { + if (s -> line_charpos != NULL) + { + mfree (objfile -> md, s -> line_charpos); + s -> line_charpos = NULL; + } + if (s -> fullname != NULL) + { + mfree (objfile -> md, s -> fullname); + s -> fullname = NULL; + } + } + } +} + +void +init_source_path () +{ + char buf[20]; + + sprintf (buf, "$cdir%c$cwd", DIRNAME_SEPARATOR); + source_path = strsave (buf); + 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, &source_path); + last_source_visited = NULL; + } + if (from_tty) + show_directories ((char *)0, from_tty); + forget_cached_source_info (); +} + +/* Add zero or more directories to the front of an arbitrary path. */ + +void +mod_path (dirname, which_path) + char *dirname; + char **which_path; +{ + char *old = *which_path; + int prefix = 0; + + if (dirname == 0) + return; + + dirname = strsave (dirname); + make_cleanup (free, dirname); + + do + { + char *name = dirname; + register char *p; + struct stat st; + + { + char *separator = strchr (name, DIRNAME_SEPARATOR); + char *space = strchr (name, ' '); + char *tab = strchr (name, '\t'); + + if (separator == 0 && space == 0 && tab == 0) + p = dirname = name + strlen (name); + else + { + p = 0; + if (separator != 0 && (p == 0 || separator < p)) + p = separator; + if (space != 0 && (p == 0 || space < p)) + p = space; + if (tab != 0 && (p == 0 || tab < p)) + p = tab; + dirname = p + 1; + while (*dirname == DIRNAME_SEPARATOR + || *dirname == ' ' + || *dirname == '\t') + ++dirname; + } + } + +#ifndef _WIN32 + /* On win32 h:\ is different to h: */ + if (SLASH_P (p[-1])) + /* Sigh. "foo/" => "foo" */ + --p; +#endif + *p = '\0'; + + while (p[-1] == '.') + { + if (p - name == 1) + { + /* "." => getwd (). */ + name = current_directory; + goto append; + } + else if (SLASH_P (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 (!ROOTED_P (name) && name[0] != '$') + name = concat (current_directory, SLASH_STRING, name, NULL); + else + name = savestring (name, p - name); + make_cleanup (free, name); + + /* Unless it's a variable, check existence. */ + if (name[0] != '$') { + /* These are warnings, not errors, since we don't want a + non-existent directory in a .gdbinit file to stop processing + of the .gdbinit file. + + Whether they get added to the path is more debatable. Current + answer is yes, in case the user wants to go make the directory + or whatever. If the directory continues to not exist/not be + a directory/etc, then having them in the path should be + harmless. */ + if (stat (name, &st) < 0) + { + int save_errno = errno; + fprintf_unfiltered (gdb_stderr, "Warning: "); + print_sys_errmsg (name, save_errno); + } + else if ((st.st_mode & S_IFMT) != S_IFDIR) + warning ("%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] == DIRNAME_SEPARATOR)) + { + /* 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 */ + strcpy (p, &p[len+1]); /* Copy from next \0 or : */ + } + p = strchr (p, DIRNAME_SEPARATOR); + if (p != 0) + ++p; + else + break; + } + if (p == 0) + { + char tinybuf[2]; + + tinybuf[0] = DIRNAME_SEPARATOR; + tinybuf[1] = '\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, tinybuf, name, NULL); + old[prefix] = c; + *which_path = concat (temp, "", &old[prefix], NULL); + prefix = strlen (temp); + free (temp); + } + else + { + *which_path = concat (name, (old[0] ? tinybuf : old), old, NULL); + prefix = strlen (name); + } + free (old); + old = *which_path; + } + } + skip_dup: ; + } while (*dirname != '\0'); +} + + +static void +source_info (ignore, from_tty) + char *ignore; + int from_tty; +{ + register struct symtab *s = current_source_symtab; + + if (!s) + { + printf_filtered("No current source file.\n"); + return; + } + printf_filtered ("Current source file is %s\n", s->filename); + if (s->dirname) + printf_filtered ("Compilation directory is %s\n", s->dirname); + if (s->fullname) + printf_filtered ("Located in %s\n", s->fullname); + if (s->nlines) + printf_filtered ("Contains %d line%s.\n", 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); +} + + + +/* Open a file named STRING, searching path PATH (dir names sep by some char) + 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 "."). 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). + + 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 = "."; + +#ifdef _WIN32 + mode |= O_BINARY; +#endif + + if (try_cwd_first || SLASH_P (string[0])) + { + int i; + filename = string; + fd = open (filename, mode, prot); + if (fd >= 0) + goto done; + for (i = 0; string[i]; i++) + if (SLASH_P (string[i])) + goto done; + } + + /* ./foo => foo */ + while (string[0] == '.' && SLASH_P (string[1])) + string += 2; + + alloclen = strlen (path) + strlen (string) + 2; + filename = (char *) alloca (alloclen); + fd = -1; + for (p = path; p; p = p1 ? p1 + 1 : 0) + { + p1 = (char *) strchr (p, DIRNAME_SEPARATOR); + 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; + } + + /* Remove trailing slashes */ + while (len > 0 && SLASH_P (filename[len-1])) + filename[--len] = 0; + + strcat (filename+len, SLASH_STRING); + strcat (filename, string); + + fd = open (filename, mode); + if (fd >= 0) break; + } + + done: + if (filename_opened) + { + if (fd < 0) + *filename_opened = (char *) 0; + else if (ROOTED_P (filename)) + *filename_opened = savestring (filename, strlen (filename)); + else + { + /* Beware the // my son, the Emacs barfs, the botch that catch... */ + + *filename_opened = concat (current_directory, + SLASH_CHAR + == current_directory[strlen(current_directory)-1] + ? "": SLASH_STRING, + filename, NULL); + } + } +#ifdef MPW + /* This is a debugging hack that can go away when all combinations + of Mac and Unix names are handled reasonably. */ + { + extern int debug_openp; + + if (debug_openp) + { + printf("openp on %s, path %s mode %d prot %d\n returned %d", + string, path, mode, prot, fd); + if (*filename_opened) + printf(" (filename is %s)", *filename_opened); + printf("\n"); + } + } +#endif /* MPW */ + + return fd; +} + + +/* This is essentially a convenience, for clients that want the behaviour + of openp, using source_path, but that really don't want the file to be + opened but want instead just to know what the full pathname is (as + qualified against source_path). + + The current working directory is searched first. + + If the file was found, this function returns 1, and FULL_PATHNAME is + set to the fully-qualified pathname. + + Else, this functions returns 0, and FULL_PATHNAME is set to NULL. + */ +int +source_full_path_of (filename, full_pathname) + char * filename; + char ** full_pathname; +{ + int fd; + + fd = openp (source_path, 1, filename, O_RDONLY, 0, full_pathname); + if (fd < 0) + { + *full_pathname = NULL; + return 0; + } + + close (fd); + return 1; +} + + +/* 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; + char *fullname; + + /* Quick way out if we already know its full name */ + if (s->fullname) + { + result = open (s->fullname, OPEN_MODE); + if (result >= 0) + return result; + /* Didn't work -- free old one, try again. */ + mfree (s->objfile->md, s->fullname); + s->fullname = NULL; + } + + if (s->dirname != NULL) + { + /* Replace a path entry of $cdir with the compilation directory name */ +#define cdir_len 5 + /* We cast strstr's result in case an ANSIhole has made it const, + which produces a "required warning" when assigned to a nonconst. */ + p = (char *)strstr (source_path, "$cdir"); + if (p && (p == path || p[-1] == DIRNAME_SEPARATOR) + && (p[cdir_len] == DIRNAME_SEPARATOR || 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 */ + } + } + + result = openp (path, 0, s->filename, OPEN_MODE, 0, &s->fullname); + if (result < 0) + { + /* Didn't work. Try using just the basename. */ + p = basename (s->filename); + if (p != s->filename) + result = openp (path, 0, p, OPEN_MODE, 0, &s->fullname); + } +#ifdef MPW + if (result < 0) + { + /* Didn't work. Try using just the MPW basename. */ + p = (char *) mpw_basename (s->filename); + if (p != s->filename) + result = openp (path, 0, p, OPEN_MODE, 0, &s->fullname); + } + if (result < 0) + { + /* Didn't work. Try using the mixed Unix/MPW basename. */ + p = (char *) mpw_mixed_basename (s->filename); + if (p != s->filename) + result = openp (path, 0, p, OPEN_MODE, 0, &s->fullname); + } +#endif /* MPW */ + + if (result >= 0) + { + fullname = s->fullname; + s->fullname = mstrsave (s->objfile->md, s->fullname); + free (fullname); + } + return result; +} + +/* Return the path to the source file associated with symtab. Returns NULL + if no symtab. */ + +char * +symtab_to_filename (s) + struct symtab *s; +{ + int fd; + + if (!s) + return NULL; + + /* If we've seen the file before, just return fullname. */ + + if (s->fullname) + return s->fullname; + + /* Try opening the file to setup fullname */ + + fd = open_source_file (s); + if (fd < 0) + return s->filename; /* File not found. Just use short name */ + + /* Found the file. Cleanup and return the full name */ + + close (fd); + return 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. */ + +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; + long mtime = 0; + int size; + + line_charpos = (int *) xmmalloc (s -> objfile -> md, + lines_allocated * sizeof (int)); + if (fstat (desc, &st) < 0) + perror_with_name (s->filename); + + if (s && s->objfile && s->objfile->obfd) + mtime = bfd_get_mtime(s->objfile->obfd); + else if (exec_bfd) + mtime = bfd_get_mtime(exec_bfd); + + if (mtime && mtime < st.st_mtime) + { + if (tui_version) + printf_filtered ("\n"); + warning("Source file is more recent than executable.\n"); + } + +#ifdef LSEEK_NOT_LINEAR + { + char c; + + /* Have to read it byte by byte to find out where the chars live */ + + line_charpos[0] = lseek (desc, 0, SEEK_CUR); + nlines = 1; + while (myread(desc, &c, 1)>0) + { + if (c == '\n') + { + if (nlines == lines_allocated) + { + lines_allocated *= 2; + line_charpos = + (int *) xmrealloc (s -> objfile -> md, (char *) line_charpos, + sizeof (int) * lines_allocated); + } + line_charpos[nlines++] = lseek (desc, 0, SEEK_CUR); + } + } + } +#else /* lseek linear. */ + { + 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 (free, data); + + /* Reassign `size' to result of read for systems where \r\n -> \n. */ + size = myread (desc, data, size); + if (size < 0) + perror_with_name (s->filename); + end = data + 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 *) xmrealloc (s -> objfile -> md, (char *) line_charpos, + sizeof (int) * lines_allocated); + } + line_charpos[nlines++] = p - data; + } + } + do_cleanups (old_cleanups); + } +#endif /* lseek linear. */ + s->nlines = nlines; + s->line_charpos = + (int *) xmrealloc (s -> objfile -> md, (char *) line_charpos, + nlines * sizeof (int)); + +} + +/* Return the character position of a line LINE in symtab S. + Return 0 if anything is invalid. */ + +#if 0 /* Currently unused */ + +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; +} + +#endif /* 0 */ + + +/* 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 +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, pc) + struct symtab *s; + int line; + int mid_statement; + CORE_ADDR pc; +{ + if (s->line_charpos == 0) + get_filename_and_charpos (s, (char **)NULL); + if (s->fullname == 0) + return 0; + if (line > s->nlines) + /* 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, pc); + + 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. */ + +static void +print_source_lines_base (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; + + + /* 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); + } + else + { + desc = last_source_error; + noerror = 1; + } + + if (desc < 0) + { + last_source_error = desc; + + if (! noerror) + { + char *name = alloca (strlen (s->filename) + 100); + sprintf (name, "%d\t%s", line, s->filename); + print_sys_errmsg (name, errno); + } + else + printf_filtered ("%d\tin %s\n", line, s->filename); + + 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, s->filename, s->nlines); + } + + if (lseek (desc, s->line_charpos[line - 1], 0) < 0) + { + close (desc); + perror_with_name (s->filename); + } + + stream = fdopen (desc, FDOPEN_MODE); + 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' && c != '\r') + printf_filtered ("^%c", c + 0100); + else if (c == 0177) + printf_filtered ("^?"); +#ifdef CRLF_SOURCE_FILES + else if (c == '\r') + { + /* Just skip \r characters. */ + } +#endif + else + printf_filtered ("%c", c); + } while (c != '\n' && (c = fgetc (stream)) >= 0); + } + + fclose (stream); +} + +/* Show source lines from the file of symtab S, starting with line + number LINE and stopping before line number STOPLINE. If this is the + not the command line version, then the source is shown in the source + window otherwise it is simply printed */ + +void +print_source_lines (s, line, stopline, noerror) + struct symtab *s; + int line, stopline, noerror; +{ +#if defined(TUI) + if (!tui_version || + m_winPtrIsNull(srcWin) || !srcWin->generic.isVisible ) + print_source_lines_base(s, line, stopline, noerror); + else + { + TuiGenWinInfoPtr locator = locatorWinInfoPtr(); + extern void tui_vAddWinToLayout PARAMS ((va_list)); + extern void tui_vUpdateSourceWindowsWithLine PARAMS ((va_list)); + + /* Regardless of whether we can open the file, + set current_source_symtab. */ + current_source_symtab = s; + current_source_line = line; + first_line_listed = line; + + /* make sure that the source window is displayed */ + tuiDo((TuiOpaqueFuncPtr)tui_vAddWinToLayout, SRC_WIN); + + tuiDo((TuiOpaqueFuncPtr)tui_vUpdateSourceWindowsWithLine, s, line); + tuiDo((TuiOpaqueFuncPtr)tui_vUpdateLocatorFilename, s->filename); + } +#else + print_source_lines_base(s, line, stopline, noerror); +#endif +} + + + +/* 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_filtered("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 (!have_full_symbols () && !have_partial_symbols()) + error ("No symbol table is loaded. Use the \"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 || STREQ (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 (STREQ (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, 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, 0); + else + sals_end = decode_line_1 (&arg1, 0, sal.symtab, sal.line, 0); + 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) + /* FIXME-32x64--assumes sal.pc fits in long. */ + error ("No source file for address %s.", + local_hex_string((unsigned long) sal.pc)); + sym = find_pc_function (sal.pc); + if (sym) + { + print_address_numeric (sal.pc, 1, gdb_stdout); + printf_filtered (" is in "); + fputs_filtered (SYMBOL_SOURCE_NAME (sym), gdb_stdout); + printf_filtered (" (%s:%d).\n", sal.symtab->filename, sal.line); + } + else + { + print_address_numeric (sal.pc, 1, gdb_stdout); + printf_filtered (" is at %s:%d.\n", + 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) + if (lines_to_list % 2 == 0) + print_source_lines (sal.symtab, + max (sal.line - (lines_to_list / 2), 1), + sal.line + (lines_to_list / 2), 0); + else + /* If lines_to_list is odd, then we round down in + * one of the lines_to_list/2 computations, round up in + * the other, so the total window size around the specified + * line comes out right. + */ + print_source_lines (sal.symtab, + max (sal.line - (lines_to_list / 2), 1), + sal.line + ((1+lines_to_list) / 2), 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; + + INIT_SAL (&sal); /* initialize to zeroes */ + + 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); + + dont_repeat (); + } + + /* 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) + { + printf_filtered ("No line number information available"); + if (sal.pc != 0) + { + /* This is useful for "info line *0x7f34". If we can't tell the + user about a source line, at least let them have the symbolic + address. */ + printf_filtered (" for address "); + wrap_here (" "); + print_address (sal.pc, gdb_stdout); + } + else + printf_filtered ("."); + printf_filtered ("\n"); + } + else if (sal.line > 0 + && find_line_pc_range (sal, &start_pc, &end_pc)) + { + if (start_pc == end_pc) + { + printf_filtered ("Line %d of \"%s\"", + sal.line, sal.symtab->filename); + wrap_here (" "); + printf_filtered (" is at address "); + print_address (start_pc, gdb_stdout); + wrap_here (" "); + printf_filtered (" but contains no code.\n"); + } + else + { + printf_filtered ("Line %d of \"%s\"", + sal.line, sal.symtab->filename); + wrap_here (" "); + printf_filtered (" starts at address "); + print_address (start_pc, gdb_stdout); + wrap_here (" "); + printf_filtered (" and ends at "); + print_address (end_pc, gdb_stdout); + printf_filtered (".\n"); + } + + /* 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; + + /* 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) + identify_source_line (sal.symtab, sal.line, 0, start_pc); + } + else + /* Is there any case in which we get here, and have an address + which the user would want to see? If we have debugging symbols + and no line numbers? */ + printf_filtered ("Line number %d is out of range for \"%s\".\n", + sal.line, sal.symtab->filename); + } + free (sals.sals); +} + +/* Commands to search the source file for a regexp. */ + +/* ARGSUSED */ +static void +forward_search_command (regex, from_tty) + char *regex; + int from_tty; +{ + register int c; + register int desc; + register FILE *stream; + int line; + char *msg; + +#if defined(TUI) + /* + ** If this is the TUI, search from the first line displayed in + ** the source window, otherwise, search from last_line_listed+1 + ** in current_source_symtab + */ + if (!tui_version) + line = last_line_listed; + else + { + if (srcWin->generic.isVisible && srcWin->generic.contentSize > 0) + line = ((TuiWinContent) + srcWin->generic.content)[0]->whichElement.source.lineOrAddr.lineNo; + else + { + printf_filtered("No source displayed.\nExpression not found.\n"); + return; + } + } + line++; +#else + line = last_line_listed + 1; +#endif + + msg = (char *) re_comp (regex); + if (msg) + error (msg); + + if (current_source_symtab == 0) + select_source_symtab (0); + + 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, FDOPEN_MODE); + clearerr (stream); + while (1) { + static char *buf = NULL; + register char *p; + int cursize, newsize; + + cursize = 256; + buf = xmalloc (cursize); + p = buf; + + c = getc (stream); + if (c == EOF) + break; + do { + *p++ = c; + if (p - buf == cursize) + { + newsize = cursize + cursize / 2; + buf = xrealloc (buf, newsize); + p = buf + cursize; + cursize = newsize; + } + } while (c != '\n' && (c = getc (stream)) >= 0); + + /* we now have a source line in buf, null terminate and match */ + *p = 0; + if (re_exec (buf) > 0) + { + /* Match! */ + fclose (stream); + if (tui_version) + print_source_lines_base (current_source_symtab, line, line+1, 0); + print_source_lines (current_source_symtab, line, line+1, 0); + set_internalvar (lookup_internalvar ("_"), + value_from_longest (builtin_type_int, + (LONGEST) line)); + current_source_line = max (line - lines_to_list / 2, 1); + return; + } + line++; + } + + printf_filtered ("Expression not found\n"); + fclose (stream); +} + +/* ARGSUSED */ +static void +reverse_search_command (regex, from_tty) + char *regex; + int from_tty; +{ + register int c; + register int desc; + register FILE *stream; + int line; + char *msg; +#if defined(TUI) + /* + ** If this is the TUI, search from the first line displayed in + ** the source window, otherwise, search from last_line_listed-1 + ** in current_source_symtab + */ + if (!tui_version) + line = last_line_listed; + else + { + if (srcWin->generic.isVisible && srcWin->generic.contentSize > 0) + line = ((TuiWinContent) + srcWin->generic.content)[0]->whichElement.source.lineOrAddr.lineNo; + else + { + printf_filtered("No source displayed.\nExpression not found.\n"); + return; + } + } + line--; +#else + line = last_line_listed - 1; +#endif + + msg = (char *) re_comp (regex); + if (msg) + error (msg); + + if (current_source_symtab == 0) + select_source_symtab (0); + + 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, FDOPEN_MODE); + clearerr (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??? */ + register char *p = buf; + + c = getc (stream); + if (c == EOF) + break; + do { + *p++ = c; + } while (c != '\n' && (c = getc (stream)) >= 0); + + /* We now have a source line in buf; null terminate and match. */ + *p = 0; + if (re_exec (buf) > 0) + { + /* Match! */ + fclose (stream); + if (tui_version) + print_source_lines_base (current_source_symtab, line, line+1, 0); + print_source_lines (current_source_symtab, line, line+1, 0); + set_internalvar (lookup_internalvar ("_"), + value_from_longest (builtin_type_int, + (LONGEST) 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) + { + fclose (stream); + perror_with_name (current_source_symtab->filename); + } + } + + printf_filtered ("Expression not found\n"); + fclose (stream); + return; +} + +void +_initialize_source () +{ + struct cmd_list_element *c; + current_source_symtab = 0; + init_source_path (); + + /* The intention is to use POSIX Basic Regular Expressions. + Always use the GNU regex routine for consistency across all hosts. + Our current GNU regex.c does not have all the POSIX features, so this is + just an approximation. */ + re_set_syntax (RE_SYNTAX_GREP); + + c = add_cmd ("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.", + &cmdlist); + + if (dbx_commands) + add_com_alias("use", "directory", class_files, 0); + + c->completer = filename_completer; + + add_cmd ("directories", no_class, show_directories, + "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.", + &showlist); + + if (xdb_commands) + { + add_com_alias("D", "directory", class_files, 0); + add_cmd ("ld", no_class, show_directories, + "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, + "Information about the current source file."); + + add_info ("line", line_info, + concat ("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 \"$_\".", NULL)); + + add_com ("forward-search", class_files, forward_search_command, + "Search for regular expression (see regex(3)) from last line listed.\n\ +The matching line number is also stored as the value of \"$_\"."); + 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.\n\ +The matching line number is also stored as the value of \"$_\"."); + + if (xdb_commands) + { + add_com_alias("/", "forward-search", class_files, 0); + add_com_alias("?", "reverse-search", class_files, 0); + } + + add_com ("list", class_files, list_command, + concat ("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.", NULL)); + + if (!xdb_commands) + add_com_alias ("l", "list", class_files, 1); + else + add_com_alias ("v", "list", class_files, 1); + + if (dbx_commands) + add_com_alias ("file", "list", class_files, 1); + + add_show_from_set + (add_set_cmd ("listsize", class_support, var_uinteger, + (char *)&lines_to_list, + "Set number of source lines gdb will list by default.", + &setlist), + &showlist); +} |