27 lines · cpp
1// RUN: %clangxx_nsan -O0 -g %s -o %t2// RUN: %run %t 2>&1 | FileCheck %s3 4// RUN: %clangxx_nsan -O3 -g %s -o %t5// RUN: %run %t 2>&1 | FileCheck %s6 7#include <cstddef>8 9#include "helpers.h"10 11extern "C" void __nsan_dump_shadow_mem(const char *addr, size_t size_bytes,12 size_t bytes_per_line, size_t reserved);13 14int main() {15 int size = 3 * sizeof(float);16 // Make sure we allocate dynamically: https://godbolt.org/z/T3h998.17 DoNotOptimize(size);18 float *array = reinterpret_cast<float *>(__builtin_alloca(size));19 DoNotOptimize(array);20 array[0] = 1.0;21 array[1] = 2.0;22 // The third float is uninitialized.23 __nsan_dump_shadow_mem((const char *)array, 3 * sizeof(float), 16, 0);24 // CHECK: {{.*}} f0 f1 f2 f3 f0 f1 f2 f3 __ __ __ __ (1.00000000000000000000) (2.00000000000000000000)25 return 0;26}27