1 // RUN: %clang_cl_asan -Od %s -Fe%t
2 // RUN: not %run %t 2>&1 | FileCheck %s
3 
4 class Parent {
5  public:
6   int field;
7 };
8 
9 class Child : public Parent {
10  public:
11   int extra_field;
12 };
13 
main(void)14 int main(void) {
15   Parent *p = new Parent;
16   Child *c = (Child*)p;  // Intentional error here!
17   c->extra_field = 42;
18 // CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
19 // CHECK: WRITE of size 4 at [[ADDR]] thread T0
20 // CHECK:   {{#0 0x[0-9a-f]* in main .*wrong_downcast_on_heap.cpp}}:[[@LINE-3]]
21 // CHECK: [[ADDR]] is located 0 bytes to the right of 4-byte region
22 // CHECK: allocated by thread T0 here:
23 // CHECK:   #0 {{.*}} operator new
24   return 0;
25 }
26 
27