gcc/testsuite/gcc.c-torture/execute/991014-1.c

   1
   2 typedef __SIZE_TYPE__ Size_t;
   3
   4 #if __SIZEOF_LONG__ < __SIZEOF_POINTER__
   5 #define bufsize ((1LL << (8 * sizeof(Size_t) - 2))-256)
   6 #else
   7 #define bufsize ((1L << (8 * sizeof(Size_t) - 2))-256)
   8 #endif
   9
  10 struct huge_struct
  11 {
  12   short buf[bufsize];
  13   int a;
  14   int b;
  15   int c;
  16   int d;
  17 };
  18
  19 union huge_union
  20 {
  21   int a;
  22   char buf[bufsize];
  23 };
  24
  25 Size_t union_size()
  26 {
  27   return sizeof(union huge_union);
  28 }
  29
  30 Size_t struct_size()
  31 {
  32   return sizeof(struct huge_struct);
  33 }
  34
  35 Size_t struct_a_offset()
  36 {
  37   return (Size_t)(&((struct huge_struct *) 0)->a);
  38 }
  39
  40 int main()
  41 {
  42   /* Check the exact sizeof value. bufsize is aligned on 256b. */
  43   if (union_size() != sizeof(char) * bufsize)
  44     abort();
  45
  46   if (struct_size() != sizeof(short) * bufsize + 4*sizeof(int))
  47     abort();
  48
  49   if (struct_a_offset() < sizeof(short) * bufsize)
  50     abort();
  51
  52   return 0;
  53 }
  54