gcc/testsuite/gcc.dg/torture/pta-ptrarith-1.c

   1 /* { dg-do run } */
   2 /* { dg-options "-fdump-tree-alias" } */
   3 /* { dg-skip-if "" { *-*-* } { "-O0" } { "" } } */
   4
   5 struct Foo {
   6   int *p;
   7 };
   8
   9 void __attribute__((noinline))
  10 foo (void *p)
  11 {
  12   struct Foo *f = (struct Foo *)p - 1;
  13   *f->p = 0;
  14 }
  15
  16 int bar (void)
  17 {
  18   struct Foo f;
  19   int i = 1;
  20   f.p = &i;
  21   foo (&f + 1);
  22   return i;
  23 }
  24 extern void abort (void);
  25 int main()
  26 {
  27   if (bar () != 0)
  28     abort ();
  29   return 0;
  30 }
  31
  32 /* { dg-final { scan-tree-dump "ESCAPED = { ESCAPED NONLOCAL f .* i }" "alias" } } */
  33 /* { dg-final { cleanup-tree-dump "alias" } } */