11 struct Isa {  struct
19   // test relies on `isa` being scribbled or unmodified after memory is freed.
20   // In order for this to work the start of `isa` must come after whatever is in
24   Isa *isa;  argument
34   fprintf(stderr, "isa = %p\n", this->isa);  in print_my_class_name()
36   if ((uint32_t)(uintptr_t)this->isa != 0x55555555) {  in print_my_class_name()
37     fprintf(stderr, "class name: %s\n", this->isa->class_name);  in print_my_class_name()
42   Isa *my_class_isa = (Isa *)malloc(sizeof(Isa));  in main()
43   memset(my_class_isa, 0x77, sizeof(Isa));  in main()
48   my_object->isa = my_class_isa;  in main()
59   // CHECK-SCRIBBLE: isa = {{(0x)?}}{{5555555555555555|55555555}}  in main()