gcc/testsuite/gcc.c-torture/execute/pr44468.c

   1 #include <stddef.h>
   2
   3 struct S {
   4   int i;
   5   int j;
   6 };
   7 struct R {
   8   int k;
   9   struct S a;
  10 };
  11 struct Q {
  12   float k;
  13   struct S a;
  14 };
  15 struct Q s;
  16 int __attribute__((noinline,noclone))
  17 test1 (void *q)
  18 {
  19   struct S *b = (struct S *)((char *)q + sizeof (int));
  20   s.a.i = 0;
  21   b->i = 3;
  22   return s.a.i;
  23 }
  24 int __attribute__((noinline,noclone))
  25 test2 (void *q)
  26 {
  27   struct S *b = &((struct R *)q)->a;
  28   s.a.i = 0;
  29   b->i = 3;
  30   return s.a.i;
  31 }
  32 int __attribute__((noinline,noclone))
  33 test3 (void *q)
  34 {
  35   s.a.i = 0;
  36   ((struct S *)((char *)q + sizeof (int)))->i = 3;
  37   return s.a.i;
  38 }
  39 extern void abort (void);
  40 int
  41 main()
  42 {
  43   if (sizeof (float) != sizeof (int)
  44       || offsetof (struct R, a) != sizeof (int)
  45       || offsetof (struct Q, a) != sizeof (int))
  46     return 0;
  47   s.a.i = 1;
  48   s.a.j = 2;
  49   if (test1 ((void *)&s) != 3)
  50     abort ();
  51   s.a.i = 1;
  52   s.a.j = 2;
  53   if (test2 ((void *)&s) != 3)
  54     abort ();
  55   s.a.i = 1;
  56   s.a.j = 2;
  57   if (test3 ((void *)&s) != 3)
  58     abort ();
  59   return 0;
  60 }