longjmp.c revision 1.9 
1/* This testcase is part of GDB, the GNU debugger.
2
3   Copyright 2008-2020 Free Software Foundation, Inc.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#include <setjmp.h>
19
20jmp_buf env;
21
22volatile int longjmps = 0;
23volatile int resumes = 0;
24
25int
26call_longjmp (jmp_buf *buf)
27{
28  longjmps++;
29  longjmp (*buf, 1);
30}
31
32void
33hidden_longjmp (void)
34{
35  if (setjmp (env) == 0)
36    {
37      call_longjmp (&env);
38    }
39  else
40    resumes++;
41}
42
43int
44main ()
45{
46  volatile int i = 0;
47
48  /* Pattern 1 - simple longjmp.  */
49  if (setjmp (env) == 0) /* patt1 */
50    {
51      longjmps++;
52      longjmp (env, 1);
53    }
54  else
55    {
56      resumes++;
57    }
58
59  i = 1; /* miss_step_1 */
60
61
62  /* Pattern 2 - longjmp from an inner function.  */
63  if (setjmp (env) == 0) /* patt2 */
64    {
65      call_longjmp (&env);
66    }
67  else
68    {
69      resumes++;
70    }
71
72  i = 2; /* miss_step_2 */
73
74  /* Pattern 3 - setjmp/longjmp inside stepped-over function.  */
75  hidden_longjmp (); /* patt3 */
76
77  i = 77; /* longjmp caught */
78
79  i = 3; /* patt_end3.  */
80
81  return 0;
82}
83