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      1 // RUN: %clang_cl_asan -O0 %p/dll_host.cc -Fe%t
      2 // RUN: %clang_cl_asan -LD -O0 %s -Fe%t.dll
      3 // RUN: not %run %t %t.dll 2>&1 | FileCheck %s
      4 
      5 #include <malloc.h>
      6 extern "C" __declspec(dllexport)
      7 int test_function() {
      8   char *buffer = (char*)malloc(42);
      9   buffer[-1] = 42;
     10 // CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
     11 // CHECK: WRITE of size 1 at [[ADDR]] thread T0
     12 // CHECK-NEXT: test_function {{.*}}dll_malloc_left_oob.cc:[[@LINE-3]]
     13 // CHECK-NEXT: main {{.*}}dll_host.cc
     14 //
     15 // CHECK: [[ADDR]] is located 1 bytes to the left of 42-byte region
     16 // CHECK-LABEL: allocated by thread T0 here:
     17 // CHECK-NEXT:   malloc
     18 // CHECK-NEXT:   test_function {{.*}}dll_malloc_left_oob.cc:[[@LINE-10]]
     19 // CHECK-NEXT:   main {{.*}}dll_host.cc
     20 // CHECK-LABEL: SUMMARY
     21   free(buffer);
     22   return 0;
     23 }
     24