gcc/testsuite/c-c++-common/auto-init-padding-2.c

   1 /* To test that the compiler can fill all the paddings to zeroes for the
   2    structures when the auto variable is partially initialized,  fully
   3    initialized, or not initialized for -ftrivial-auto-var-init=zero.  */
   4 /* { dg-do run } */
   5 /* { dg-options "-ftrivial-auto-var-init=zero" } */
   6
   7 /* Structure with no padding. */
   8 struct test_packed {
   9   unsigned long one;
  10   unsigned long two;
  11   unsigned long three;
  12   unsigned long four;
  13 } p1;
  14
  15 /* Simple structure with padding likely to be covered by compiler. */
  16 struct test_small_hole {
  17   unsigned long one;
  18   char two;
  19   /* 3 byte padding hole here. */
  20   int three;
  21   unsigned long four;
  22 } sh1;
  23
  24 /* Try to trigger unhandled padding in a structure. */
  25 struct test_aligned {
  26   unsigned int internal1;
  27   unsigned long long internal2;
  28 } __attribute__((__aligned__(64)));
  29
  30 struct test_aligned a1;
  31
  32 struct test_big_hole {
  33   unsigned char one;
  34   unsigned char two;
  35   unsigned char three;
  36   /* 61 byte padding hole here. */
  37   struct test_aligned four;
  38 } __attribute__((__aligned__(64)));
  39
  40 struct test_big_hole bh1;
  41
  42 struct test_trailing_hole {
  43   char *one;
  44   char *two;
  45   char *three;
  46   char four;
  47   /* "sizeof(unsigned long) - 1" byte padding hole here. */
  48 } th1;
  49
  50 __attribute__((noipa)) void
  51 foo (struct test_packed *p, struct test_small_hole *sh, struct test_aligned *a,
  52      struct test_big_hole *bh, struct test_trailing_hole *th)
  53 {
  54   p->one = 1; p->two = 2; p->three = 3; p->four = 4;
  55   sh->one = 11; sh->two = 12; sh->three = 13; sh->four = 14;
  56   a->internal1 = 21; a->internal2 = 22;
  57   bh->one = 31; bh->two = 32; bh->three = 33;
  58   bh->four.internal1 = 34; bh->four.internal2 = 35;
  59   th->one = 0; th->two = 0; th->three = 0; th->four = 44;
  60 }
  61
  62 int main ()
  63 {
  64   struct test_packed p2;
  65   struct test_small_hole sh2;
  66   struct test_aligned a2;
  67   struct test_big_hole bh2;
  68   struct test_trailing_hole th2;
  69
  70   struct test_packed p3 = {.one = 1};
  71   struct test_small_hole sh3 = {.two = 12};
  72   struct test_aligned a3 = {.internal1 = 21};
  73   struct test_big_hole bh3 = {.one = 31};
  74   struct test_trailing_hole th3 = {.three = 0};
  75
  76   struct test_packed p4 = {.one = 1, .two = 2, .three = 3, .four = 4};
  77   struct test_small_hole sh4 = {.one = 11, .two = 12, .three = 13, .four = 14};
  78   struct test_aligned a4 = {.internal1 = 21, .internal2 = 22};
  79   struct test_big_hole bh4 = {.one = 31, .two = 32, .three = 33};
  80   struct test_trailing_hole th4 = {.one = 0, .two = 0, .three = 0, .four = 44};
  81
  82   foo (&p1, &sh1, &a1, &bh1, &th1);
  83   foo (&p2, &sh2, &a2, &bh2, &th2);
  84   foo (&p3, &sh3, &a3, &bh3, &th3);
  85   bh4.four.internal1 = 34; bh4.four.internal2 = 35;
  86
  87   __builtin_clear_padding (&p1);
  88   __builtin_clear_padding (&sh1);
  89   __builtin_clear_padding (&a1);
  90   __builtin_clear_padding (&bh1);
  91   __builtin_clear_padding (&th1);
  92
  93   if (__builtin_memcmp (&p1, &p2, sizeof (p1))
  94       || __builtin_memcmp (&sh1, &sh2, sizeof (sh1))
  95       || __builtin_memcmp (&a1, &a2, sizeof (a1))
  96       || __builtin_memcmp (&bh1, &bh2, sizeof (bh1))
  97       || __builtin_memcmp (&th1, &th2, sizeof (th1)))
  98     __builtin_abort ();
  99   if (__builtin_memcmp (&p1, &p3, sizeof (p1))
 100       || __builtin_memcmp (&sh1, &sh3, sizeof (sh1))
 101       || __builtin_memcmp (&a1, &a3, sizeof (a1))
 102       || __builtin_memcmp (&bh1, &bh3, sizeof (bh1))
 103       || __builtin_memcmp (&th1, &th3, sizeof (th1)))
 104     __builtin_abort ();
 105   if (__builtin_memcmp (&p1, &p4, sizeof (p1))
 106       || __builtin_memcmp (&sh1, &sh4, sizeof (sh1))
 107       || __builtin_memcmp (&a1, &a4, sizeof (a1))
 108       || __builtin_memcmp (&bh1, &bh4, sizeof (bh1))
 109       || __builtin_memcmp (&th1, &th4, sizeof (th1)))
 110     __builtin_abort ();
 111
 112
 113   return 0;
 114 }