144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/* Reverse execution and reverse debugging.
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Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "gdb_string.h"
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#include "target.h"
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#include "top.h"
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#include "cli/cli-cmds.h"
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#include "cli/cli-decode.h"
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#include "inferior.h"
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/* User interface:
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reverse-step, reverse-next etc. */
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static void
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exec_direction_default (void *notused)
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{
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/* Return execution direction to default state. */
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execution_direction = EXEC_FORWARD;
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}
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/* exec_reverse_once -- accepts an arbitrary gdb command (string),
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and executes it with exec-direction set to 'reverse'.
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Used to implement reverse-next etc. commands. */
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static void
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exec_reverse_once (char *cmd, char *args, int from_tty)
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{
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char *reverse_command;
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enum exec_direction_kind dir = execution_direction;
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struct cleanup *old_chain;
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if (dir == EXEC_ERROR)
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error (_("Target %s does not support this command."), target_shortname);
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if (dir == EXEC_REVERSE)
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error (_("Already in reverse mode. Use '%s' or 'set exec-dir forward'."),
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cmd);
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if (!target_can_execute_reverse)
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error (_("Target %s does not support this command."), target_shortname);
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reverse_command = xstrprintf ("%s %s", cmd, args ? args : "");
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old_chain = make_cleanup (exec_direction_default, NULL);
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make_cleanup (xfree, reverse_command);
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execution_direction = EXEC_REVERSE;
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execute_command (reverse_command, from_tty);
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do_cleanups (old_chain);
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}
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static void
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reverse_step (char *args, int from_tty)
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{
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exec_reverse_once ("step", args, from_tty);
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}
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static void
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reverse_stepi (char *args, int from_tty)
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{
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exec_reverse_once ("stepi", args, from_tty);
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}
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static void
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reverse_next (char *args, int from_tty)
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{
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exec_reverse_once ("next", args, from_tty);
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}
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static void
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reverse_nexti (char *args, int from_tty)
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{
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exec_reverse_once ("nexti", args, from_tty);
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}
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static void
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reverse_continue (char *args, int from_tty)
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{
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exec_reverse_once ("continue", args, from_tty);
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}
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static void
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reverse_finish (char *args, int from_tty)
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{
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exec_reverse_once ("finish", args, from_tty);
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}
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void
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_initialize_reverse (void)
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{
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add_com ("reverse-step", class_run, reverse_step, _("\
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Step program backward until it reaches the beginning of another source line.\n\
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Argument N means do this N times (or till program stops for another reason).")
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);
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add_com_alias ("rs", "reverse-step", class_alias, 1);
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add_com ("reverse-next", class_run, reverse_next, _("\
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Step program backward, proceeding through subroutine calls.\n\
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Like the \"reverse-step\" command as long as subroutine calls do not happen;\n\
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when they do, the call is treated as one instruction.\n\
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Argument N means do this N times (or till program stops for another reason).")
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);
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add_com_alias ("rn", "reverse-next", class_alias, 1);
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add_com ("reverse-stepi", class_run, reverse_stepi, _("\
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Step backward exactly one instruction.\n\
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Argument N means do this N times (or till program stops for another reason).")
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);
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add_com_alias ("rsi", "reverse-stepi", class_alias, 0);
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add_com ("reverse-nexti", class_run, reverse_nexti, _("\
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Step backward one instruction, but proceed through called subroutines.\n\
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Argument N means do this N times (or till program stops for another reason).")
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);
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add_com_alias ("rni", "reverse-nexti", class_alias, 0);
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add_com ("reverse-continue", class_run, reverse_continue, _("\
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Continue program being debugged but run it in reverse.\n\
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If proceeding from breakpoint, a number N may be used as an argument,\n\
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which means to set the ignore count of that breakpoint to N - 1 (so that\n\
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the breakpoint won't break until the Nth time it is reached)."));
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add_com_alias ("rc", "reverse-continue", class_alias, 0);
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add_com ("reverse-finish", class_run, reverse_finish, _("\
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Execute backward until just before selected stack frame is called."));
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}
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