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// Test that __msan_copy_shadow copies shadow, updates origin and does not touch
// the application memory.
// RUN: %clangxx_msan -fsanitize-memory-track-origins=0 -O0 %s -o %t && not %run %t 2>&1
// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O0 %s -o %t && not %run %t 2>&1 | FileCheck --check-prefix=CHECK --check-prefix=CHECK-%short-stack %s
#include <assert.h>
#include <string.h>
#include <sanitizer/msan_interface.h>
int main() {
char *a = new char[4];
char *b = new char[4];
a[1] = 1;
a[3] = 2;
memset(b, 42, 4);
// Test that __msan_copy_shadow does not touch the contents of b[].
__msan_copy_shadow(b, a, 4);
__msan_unpoison(b, 4);
assert(b[0] == 42 && b[1] == 42 && b[2] == 42 && b[3] == 42);
// Test that __msan_copy_shadow correctly updates shadow and origin of b[].
__msan_copy_shadow(b, a, 4);
assert(__msan_test_shadow(b, 4) == 0);
assert(__msan_test_shadow(b + 1, 3) == 1);
assert(__msan_test_shadow(b + 3, 1) == -1);
__msan_check_mem_is_initialized(b, 4);
// CHECK: use-of-uninitialized-value
// CHECK: {{in main.*msan_copy_shadow.cc:}}[[@LINE-2]]
// CHECK: Uninitialized value was stored to memory at
// CHECK-FULL-STACK: {{in main.*msan_copy_shadow.cc:}}[[@LINE-8]]
// CHECK-SHORT-STACK: {{in __msan_copy_shadow .*msan_interceptors.cc:}}
// CHECK: Uninitialized value was created by a heap allocation
// CHECK: {{in main.*msan_copy_shadow.cc:}}[[@LINE-23]]
}
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