1// RUN: %clangxx_asan -std=c++11 -O0 %s -o %t
2// RUN: not %run %t       2>&1 | FileCheck %s --check-prefix=READ
3// RUN: not %run %t write 2>&1 | FileCheck %s --check-prefix=WRITE
4
5#include <windows.h>
6#include <stdio.h>
7
8static volatile int sink;
9__attribute__((noinline)) void Read(int *ptr) { sink = *ptr; }
10__attribute__((noinline)) void Write(int *ptr) { *ptr = 0; }
11int main(int argc, char **argv) {
12  // Writes to shadow are detected as reads from shadow gap (because of how the
13  // shadow mapping works). This is kinda hard to fix. Test a random address in
14  // the application part of the address space.
15  void *volatile p = VirtualAlloc(0, 4096, MEM_COMMIT, PAGE_READONLY);
16  bool ok = VirtualFree(p, 0, MEM_RELEASE);
17  if (!ok) {
18    printf("VirtualFree failed\n");
19    return 0;
20  }
21  if (argc == 1)
22    Read((int *)p);
23  else
24    Write((int *)p);
25}
26// READ: AddressSanitizer: access-violation on unknown address
27// READ: The signal is caused by a READ memory access.
28// WRITE: AddressSanitizer: access-violation on unknown address
29// WRITE: The signal is caused by a WRITE memory access.
30