1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
| // RUN: %clangxx_msan -O2 %s -o %t && %run %t
#include <sanitizer/msan_interface.h>
struct S {
S(int a0) : a(a0) {}
int a;
int b;
};
// Here S is passed to FooRun as a 64-bit integer.
// This triggers an optimization where 10000 * s.a is transformed into
// ((*(uint64_t *)&s) * (10000 * 2**32)) >> 32
// Test that MSan understands that this kills the uninitialized high half of S
// (i.e. S::b).
void FooRun(S s) {
int64_t x = 10000 * s.a;
__msan_check_mem_is_initialized(&x, sizeof(x));
}
int main(void) {
S z(1);
// Take &z to ensure that it is built on stack.
S *volatile p = &z;
FooRun(z);
return 0;
}
|