gcc/testsuite/gcc.dg/setjmp-2.c

   1 /* PR middle-end/17813 */
   2 /* Origin: Tom Hughes <tom@compton.nu> */
   3 /* { dg-do run { target i?86-*-linux* x86_64-*-linux* } } */
   4 /* { dg-options "-O -fomit-frame-pointer" } */
   5 /* { dg-options "-O -fomit-frame-pointer -march=i386" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
   6
   7 #include <setjmp.h>
   8 #include <signal.h>
   9 #include <stdlib.h>
  10
  11 static jmp_buf segv_jmpbuf;
  12
  13 static void segv_handler(int seg)
  14 {
  15    __builtin_longjmp(segv_jmpbuf, 1);
  16 }
  17
  18 static int is_addressable(void *p, size_t size)
  19 {
  20    volatile char * volatile cp = (volatile char *)p;
  21    volatile int ret;
  22    struct sigaction sa, origsa;
  23    sigset_t mask;
  24
  25    sa.sa_handler = segv_handler;
  26    sa.sa_flags = 0;
  27    sigfillset(&sa.sa_mask);
  28    sigaction(SIGSEGV, &sa, &origsa);
  29    sigprocmask(SIG_SETMASK, NULL, &mask);
  30
  31    if (__builtin_setjmp(segv_jmpbuf) == 0) {
  32       while(size--)
  33          *cp++;
  34       ret = 1;
  35     } else
  36       ret = 0;
  37
  38    sigaction(SIGSEGV, &origsa, NULL);
  39    sigprocmask(SIG_SETMASK, &mask, NULL);
  40
  41    return ret;
  42 }
  43
  44 int main(int argc, char **argv)
  45 {
  46    is_addressable(0x0, 1);
  47    return 0;
  48 }