1// RUN: %clang_cl_asan -O0 %s -Fe%t
2// RUN: not %run %t 2>&1 | FileCheck %s
3
4class Parent {
5 public:
6  int field;
7};
8
9class Child : public Parent {
10 public:
11  int extra_field;
12};
13
14int main(void) {
15  Parent p;
16  Child *c = (Child*)&p;  // Intentional error here!
17  c->extra_field = 42;
18// CHECK: AddressSanitizer: stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
19// CHECK: WRITE of size 4 at [[ADDR]] thread T0
20// CHECK-NEXT:  {{#0 0x[0-9a-f]* in main .*wrong_downcast_on_stack.cc}}:[[@LINE-3]]
21// CHECK: [[ADDR]] is located in stack of thread T0 at offset [[OFFSET:[0-9]+]] in frame
22// CHECK-NEXT:  {{#0 0x[0-9a-f]* in main }}
23// CHECK:  'p' <== Memory access at offset [[OFFSET]] overflows this variable
24  return 0;
25}
26
27