gdb/testsuite/gdb.base/longjmp.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2008-2023 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
  20 jmp_buf env;
  21
  22 volatile int longjmps = 0;
  23 volatile int resumes = 0;
  24
  25 int
  26 call_longjmp (jmp_buf *buf)
  27 {
  28   longjmps++;
  29   longjmp (*buf, 1);
  30 }
  31
  32 void
  33 hidden_longjmp (void)
  34 {
  35   if (setjmp (env) == 0)
  36     {
  37       call_longjmp (&env);
  38     }
  39   else
  40     resumes++;
  41 }
  42
  43 int
  44 main ()
  45 {
  46   volatile int i = 0;
  47
  48   /* Pattern 1 - simple longjmp.  */
  49   if (setjmp (env) != 0) /* patt1 */
  50     {
  51       resumes++;
  52     }
  53   else
  54     {
  55       longjmps++;
  56       longjmp (env, 1);
  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 }