1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/* Reverse execution and reverse debugging.
Copyright (C) 2006, 2007, 2008 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#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)
{
/* String buffer for command consing. */
char reverse_command[512];
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);
old_chain = make_cleanup (exec_direction_default, NULL);
sprintf (reverse_command, "%s %s", cmd, args ? args : "");
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);
}
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, running 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."));
}
|
