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 
6 int XXX[2] = {2, 3};
7 extern int YYY[];
8 #include <string.h>
main(int argc,char ** argv)9 int main(int argc, char **argv) {
10   memset(XXX, 0, 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 to the left of global variable}}
14   // CHECK:   {{.*YYY.* of size 12}}
15   int res = YYY[-1];
16   return res;
17 }
18