1// RUN: %clangxx_asan -O0 %s %p/Helpers/underflow.cpp -o %t && not %run %t 2>&1 | FileCheck %s
2// RUN: %clangxx_asan -O1 %s %p/Helpers/underflow.cpp -o %t && not %run %t 2>&1 | FileCheck %s
3// RUN: %clangxx_asan -O2 %s %p/Helpers/underflow.cpp -o %t && not %run %t 2>&1 | FileCheck %s
4// RUN: %clangxx_asan -O3 %s %p/Helpers/underflow.cpp -o %t && not %run %t 2>&1 | FileCheck %s
5
6int XXX[2] = {2, 3};
7extern int YYY[];
8#include <string.h>
9int main(int argc, char **argv) {
10 memset(s: XXX, c: 0, n: 2*sizeof(int));
11 // CHECK: {{READ of size 4 at 0x.* thread T0}}
12 // CHECK: {{ #0 0x.* in main .*global-underflow.cpp:}}[[@LINE+3]]
13 // CHECK: {{0x.* is located 4 bytes before global variable}}
14 // CHECK: {{.*YYY.* of size 12}}
15 int res = YYY[-1];
16 return res;
17}
18

source code of compiler-rt/test/asan/TestCases/global-underflow.cpp