/* Reverse execution and reverse debugging. Copyright (C) 2006, 2007, 2008, 2009 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "gdb_string.h" #include "target.h" #include "top.h" #include "cli/cli-cmds.h" #include "cli/cli-decode.h" #include "inferior.h" /* User interface: reverse-step, reverse-next etc. */ static void exec_direction_default (void *notused) { /* Return execution direction to default state. */ execution_direction = EXEC_FORWARD; } /* exec_reverse_once -- accepts an arbitrary gdb command (string), and executes it with exec-direction set to 'reverse'. Used to implement reverse-next etc. commands. */ static void exec_reverse_once (char *cmd, char *args, int from_tty) { char *reverse_command; enum exec_direction_kind dir = execution_direction; struct cleanup *old_chain; if (dir == EXEC_ERROR) error (_("Target %s does not support this command."), target_shortname); if (dir == EXEC_REVERSE) error (_("Already in reverse mode. Use '%s' or 'set exec-dir forward'."), cmd); if (!target_can_execute_reverse) error (_("Target %s does not support this command."), target_shortname); reverse_command = xstrprintf ("%s %s", cmd, args ? args : ""); old_chain = make_cleanup (exec_direction_default, NULL); make_cleanup (xfree, reverse_command); execution_direction = EXEC_REVERSE; execute_command (reverse_command, from_tty); do_cleanups (old_chain); } static void reverse_step (char *args, int from_tty) { exec_reverse_once ("step", args, from_tty); } static void reverse_stepi (char *args, int from_tty) { exec_reverse_once ("stepi", args, from_tty); } static void reverse_next (char *args, int from_tty) { exec_reverse_once ("next", args, from_tty); } static void reverse_nexti (char *args, int from_tty) { exec_reverse_once ("nexti", args, from_tty); } static void reverse_continue (char *args, int from_tty) { exec_reverse_once ("continue", args, from_tty); } static void reverse_finish (char *args, int from_tty) { exec_reverse_once ("finish", args, from_tty); } /* Provide a prototype to silence -Wmissing-prototypes. */ extern initialize_file_ftype _initialize_reverse; void _initialize_reverse (void) { add_com ("reverse-step", class_run, reverse_step, _("\ Step program backward until it reaches the beginning of another source line.\n\ Argument N means do this N times (or till program stops for another reason).") ); add_com_alias ("rs", "reverse-step", class_alias, 1); add_com ("reverse-next", class_run, reverse_next, _("\ Step program backward, proceeding through subroutine calls.\n\ Like the \"reverse-step\" command as long as subroutine calls do not happen;\n\ when they do, the call is treated as one instruction.\n\ Argument N means do this N times (or till program stops for another reason).") ); add_com_alias ("rn", "reverse-next", class_alias, 1); add_com ("reverse-stepi", class_run, reverse_stepi, _("\ Step backward exactly one instruction.\n\ Argument N means do this N times (or till program stops for another reason).") ); add_com_alias ("rsi", "reverse-stepi", class_alias, 0); add_com ("reverse-nexti", class_run, reverse_nexti, _("\ Step backward one instruction, but proceed through called subroutines.\n\ Argument N means do this N times (or till program stops for another reason).") ); add_com_alias ("rni", "reverse-nexti", class_alias, 0); add_com ("reverse-continue", class_run, reverse_continue, _("\ Continue program being debugged but run it in reverse.\n\ If proceeding from breakpoint, a number N may be used as an argument,\n\ which means to set the ignore count of that breakpoint to N - 1 (so that\n\ the breakpoint won't break until the Nth time it is reached).")); add_com_alias ("rc", "reverse-continue", class_alias, 0); add_com ("reverse-finish", class_run, reverse_finish, _("\ Execute backward until just before selected stack frame is called.")); }