57 lines · cpp
1// RUN: %clangxx_nsan -O2 -g %s -o %t2// RUN: %run %t 2>&1 | FileCheck %s3 4// Check compilation mode that is required to call memcpy/memmove.5// RUN: %clangxx_nsan -fno-builtin -O2 -g %s -o %t6// RUN: %run %t 2>&1 | FileCheck %s7 8// This tests a particularaly hard case of memory tracking. stable_sort does9// conditional swaps of pairs of elements with mixed types (int/double).10 11#include <algorithm>12#include <cstddef>13#include <cstdio>14#include <utility>15#include <vector>16 17extern "C" void __nsan_dump_shadow_mem(const char *addr, size_t size_bytes,18 size_t bytes_per_line, size_t reserved);19 20__attribute__((noinline)) void Run(std::vector<int> &indices,21 std::vector<double> &values) {22 const auto num_entries = indices.size();23 std::vector<std::pair<int, double>> entries;24 entries.reserve(num_entries);25 for (size_t i = 0; i < num_entries; ++i)26 entries.emplace_back(indices[i], values[i]);27 28 __nsan_dump_shadow_mem((const char *)&entries[0].second, sizeof(double),29 sizeof(double), 0);30 __nsan_dump_shadow_mem((const char *)&entries[1].second, sizeof(double),31 sizeof(double), 0);32 // CHECK: {{.*}}: d0 d1 d2 d3 d4 d5 d6 d7 (1.02800000000000002487)33 // CHECK-NEXT: {{.*}}: d0 d1 d2 d3 d4 d5 d6 d7 (7.95099999999999962341)34 std::stable_sort(35 entries.begin(), entries.end(),36 [](const std::pair<int, double> &a, const std::pair<int, double> &b) {37 return a.first < b.first;38 });39 __nsan_dump_shadow_mem((const char *)&entries[0].second, sizeof(double),40 sizeof(double), 0);41 __nsan_dump_shadow_mem((const char *)&entries[1].second, sizeof(double),42 sizeof(double), 0);43 // We make sure that the shadow values have been swapped correctly.44 // CHECK-NEXT: {{.*}}: d0 d1 d2 d3 d4 d5 d6 d7 (7.95099999999999962341)45 // CHECK-NEXT: {{.*}}: d0 d1 d2 d3 d4 d5 d6 d7 (1.02800000000000002487)46}47 48int main() {49 std::vector<int> indices;50 std::vector<double> values;51 indices.push_back(75);52 values.push_back(1.028);53 indices.push_back(74);54 values.push_back(7.951);55 Run(indices, values);56}57