20071219-1.c

来自「用于进行gcc测试」· C语言 代码 · 共 72 行

/* PR c++/34459 */

extern void abort (void);
extern void *memset (void *s, int c, __SIZE_TYPE__ n);

struct S
{
  char s[25];
};

struct S *p;

void __attribute__((noinline))
foo (struct S *x, int set)
{
  int i;
  for (i = 0; i < sizeof (x->s); ++i)
    if (x->s[i] != 0)
      abort ();
    else if (set)
      x->s[i] = set;
  p = x;
}

void __attribute__((noinline))
test1 (void)
{
  struct S a;
  memset (&a.s, '\0', sizeof (a.s));
  foo (&a, 0);
  struct S b = a;
  foo (&b, 1);
  b = a;
  b = b;
  foo (&b, 0);
}

void __attribute__((noinline))
test2 (void)
{
  struct S a;
  memset (&a.s, '\0', sizeof (a.s));
  foo (&a, 0);
  struct S b = a;
  foo (&b, 1);
  b = a;
  b = *p;
  foo (&b, 0);
}

void __attribute__((noinline))
test3 (void)
{
  struct S a;
  memset (&a.s, '\0', sizeof (a.s));
  foo (&a, 0);
  struct S b = a;
  foo (&b, 1);
  *p = a;
  *p = b;
  foo (&b, 0);
}

int
main (void)
{
  test1 ();
  test2 ();
  test3 ();
  return 0;
}