| 1 | /* Reverse execution and reverse debugging. |
| 2 | |
| 3 | Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "gdb_string.h" |
| 24 | #include "target.h" |
| 25 | #include "top.h" |
| 26 | #include "cli/cli-cmds.h" |
| 27 | #include "cli/cli-decode.h" |
| 28 | #include "inferior.h" |
| 29 | |
| 30 | /* User interface: |
| 31 | reverse-step, reverse-next etc. */ |
| 32 | |
| 33 | static void |
| 34 | exec_direction_default (void *notused) |
| 35 | { |
| 36 | /* Return execution direction to default state. */ |
| 37 | execution_direction = EXEC_FORWARD; |
| 38 | } |
| 39 | |
| 40 | /* exec_reverse_once -- accepts an arbitrary gdb command (string), |
| 41 | and executes it with exec-direction set to 'reverse'. |
| 42 | |
| 43 | Used to implement reverse-next etc. commands. */ |
| 44 | |
| 45 | static void |
| 46 | exec_reverse_once (char *cmd, char *args, int from_tty) |
| 47 | { |
| 48 | char *reverse_command; |
| 49 | enum exec_direction_kind dir = execution_direction; |
| 50 | struct cleanup *old_chain; |
| 51 | |
| 52 | if (dir == EXEC_ERROR) |
| 53 | error (_("Target %s does not support this command."), target_shortname); |
| 54 | |
| 55 | if (dir == EXEC_REVERSE) |
| 56 | error (_("Already in reverse mode. Use '%s' or 'set exec-dir forward'."), |
| 57 | cmd); |
| 58 | |
| 59 | if (!target_can_execute_reverse) |
| 60 | error (_("Target %s does not support this command."), target_shortname); |
| 61 | |
| 62 | reverse_command = xstrprintf ("%s %s", cmd, args ? args : ""); |
| 63 | old_chain = make_cleanup (exec_direction_default, NULL); |
| 64 | make_cleanup (xfree, reverse_command); |
| 65 | execution_direction = EXEC_REVERSE; |
| 66 | execute_command (reverse_command, from_tty); |
| 67 | do_cleanups (old_chain); |
| 68 | } |
| 69 | |
| 70 | static void |
| 71 | reverse_step (char *args, int from_tty) |
| 72 | { |
| 73 | exec_reverse_once ("step", args, from_tty); |
| 74 | } |
| 75 | |
| 76 | static void |
| 77 | reverse_stepi (char *args, int from_tty) |
| 78 | { |
| 79 | exec_reverse_once ("stepi", args, from_tty); |
| 80 | } |
| 81 | |
| 82 | static void |
| 83 | reverse_next (char *args, int from_tty) |
| 84 | { |
| 85 | exec_reverse_once ("next", args, from_tty); |
| 86 | } |
| 87 | |
| 88 | static void |
| 89 | reverse_nexti (char *args, int from_tty) |
| 90 | { |
| 91 | exec_reverse_once ("nexti", args, from_tty); |
| 92 | } |
| 93 | |
| 94 | static void |
| 95 | reverse_continue (char *args, int from_tty) |
| 96 | { |
| 97 | exec_reverse_once ("continue", args, from_tty); |
| 98 | } |
| 99 | |
| 100 | static void |
| 101 | reverse_finish (char *args, int from_tty) |
| 102 | { |
| 103 | exec_reverse_once ("finish", args, from_tty); |
| 104 | } |
| 105 | |
| 106 | void |
| 107 | _initialize_reverse (void) |
| 108 | { |
| 109 | add_com ("reverse-step", class_run, reverse_step, _("\ |
| 110 | Step program backward until it reaches the beginning of another source line.\n\ |
| 111 | Argument N means do this N times (or till program stops for another reason).") |
| 112 | ); |
| 113 | add_com_alias ("rs", "reverse-step", class_alias, 1); |
| 114 | |
| 115 | add_com ("reverse-next", class_run, reverse_next, _("\ |
| 116 | Step program backward, proceeding through subroutine calls.\n\ |
| 117 | Like the \"reverse-step\" command as long as subroutine calls do not happen;\n\ |
| 118 | when they do, the call is treated as one instruction.\n\ |
| 119 | Argument N means do this N times (or till program stops for another reason).") |
| 120 | ); |
| 121 | add_com_alias ("rn", "reverse-next", class_alias, 1); |
| 122 | |
| 123 | add_com ("reverse-stepi", class_run, reverse_stepi, _("\ |
| 124 | Step backward exactly one instruction.\n\ |
| 125 | Argument N means do this N times (or till program stops for another reason).") |
| 126 | ); |
| 127 | add_com_alias ("rsi", "reverse-stepi", class_alias, 0); |
| 128 | |
| 129 | add_com ("reverse-nexti", class_run, reverse_nexti, _("\ |
| 130 | Step backward one instruction, but proceed through called subroutines.\n\ |
| 131 | Argument N means do this N times (or till program stops for another reason).") |
| 132 | ); |
| 133 | add_com_alias ("rni", "reverse-nexti", class_alias, 0); |
| 134 | |
| 135 | add_com ("reverse-continue", class_run, reverse_continue, _("\ |
| 136 | Continue program being debugged but run it in reverse.\n\ |
| 137 | If proceeding from breakpoint, a number N may be used as an argument,\n\ |
| 138 | which means to set the ignore count of that breakpoint to N - 1 (so that\n\ |
| 139 | the breakpoint won't break until the Nth time it is reached).")); |
| 140 | add_com_alias ("rc", "reverse-continue", class_alias, 0); |
| 141 | |
| 142 | add_com ("reverse-finish", class_run, reverse_finish, _("\ |
| 143 | Execute backward until just before selected stack frame is called.")); |
| 144 | } |