gdb/testsuite/gdb.base/longjmp.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2008, 2009 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
  19 #include <setjmp.h>
  20
  21 jmp_buf env;
  22
  23 volatile int longjmps = 0;
  24 volatile int resumes = 0;
  25
  26 int
  27 call_longjmp (jmp_buf *buf)
  28 {
  29   longjmps++;
  30   longjmp (*buf, 1);
  31 }
  32
  33 void
  34 hidden_longjmp (void)
  35 {
  36   if (setjmp (env) == 0) /* longjmp caught */
  37     {
  38       call_longjmp (&env);
  39     }
  40   else
  41     resumes++;
  42 }
  43
  44 int
  45 main ()
  46 {
  47   volatile int i = 0;
  48
  49   /* Pattern 1 - simple longjmp.  */
  50   if (setjmp (env) == 0) /* patt1 */
  51     {
  52       longjmps++;
  53       longjmp (env, 1);
  54     }
  55   else
  56     {
  57       resumes++;
  58     }
  59
  60   i = 1; /* miss_step_1 */
  61
  62
  63   /* Pattern 2 - longjmp from an inner function.  */
  64   if (setjmp (env) == 0) /* patt2 */
  65     {
  66       call_longjmp (&env);
  67     }
  68   else
  69     {
  70       resumes++;
  71     }
  72
  73   i = 2; /* miss_step_2 */
  74
  75   /* Pattern 3 - setjmp/longjmp inside stepped-over function.  */
  76   hidden_longjmp (); /* patt3 */
  77
  78   i = 3; /* patt_end3.  */
  79
  80   return 0;
  81 }