gcc/testsuite/gcc.c-torture/execute/20170401-1.c

   1 /* PR45070 */
   2 extern void abort(void);
   3
   4 struct packed_ushort {
   5     unsigned short ucs;
   6 } __attribute__((packed));
   7
   8 struct source {
   9     int pos, length;
  10 };
  11
  12 static int flag;
  13
  14 static void __attribute__((noinline)) fetch(struct source *p)
  15 {
  16     p->length = 128;
  17 }
  18
  19 static struct packed_ushort __attribute__((noinline)) next(struct source *p)
  20 {
  21     struct packed_ushort rv;
  22
  23     if (p->pos >= p->length) {
  24         if (flag) {
  25             flag = 0;
  26             fetch(p);
  27             return next(p);
  28         }
  29         flag = 1;
  30         rv.ucs = 0xffff;
  31         return rv;
  32     }
  33     rv.ucs = 0;
  34     return rv;
  35 }
  36
  37 int main(void)
  38 {
  39     struct source s;
  40     int i;
  41
  42     s.pos = 0;
  43     s.length = 0;
  44     flag = 0;
  45
  46     for (i = 0; i < 16; i++) {
  47         struct packed_ushort rv = next(&s);
  48         if ((i == 0 && rv.ucs != 0xffff)
  49             || (i > 0 && rv.ucs != 0))
  50             abort();
  51     }
  52     return 0;
  53 }