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

   1 /* { dg-do run } */
   2 /* { dg-options "-fdump-tree-alias" } */
   3 /* { dg-skip-if "" { *-*-* } { "-O0" "-fno-fat-lto-objects" } { "" } } */
   4
   5 int *p;
   6 void __attribute__((noinline,noclone))
   7 bar (void)
   8 {
   9   *p = 1;
  10 }
  11 int __attribute__((noinline,noclone))
  12 foo (__INTPTR_TYPE__ addr)
  13 {
  14   int i;
  15   /* q points to ANYTHING */
  16   int **q = (int **)addr;
  17   /* this store needs to cause i to escape */
  18   *q = &i;
  19   i = 0;
  20   /* and thus be clobbered by this function call */
  21   bar ();
  22   return i;
  23 }
  24 extern void abort (void);
  25 int
  26 main()
  27 {
  28   if (foo ((__INTPTR_TYPE__)&p) != 1)
  29     abort ();
  30   return 0;
  31 }
  32
  33 /* { dg-final { scan-tree-dump "ESCAPED = {\[^\n\}\]* i \[^\n\}\]*}" "alias" } } */
  34 /* { dg-final { cleanup-tree-dump "alias" } } */