| 1 | // RUN: %clangxx_nsan -O2 -g %s -o %t |
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| 2 | // RUN: %run %t 2>&1 | FileCheck %s |
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| 3 | |
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| 4 | // Check compilation mode that is required to call memcpy/memmove. |
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| 5 | // RUN: %clangxx_nsan -fno-builtin -O2 -g %s -o %t |
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| 6 | // RUN: %run %t 2>&1 | FileCheck %s |
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| 7 | |
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| 8 | // This tests a particularaly hard case of memory tracking. stable_sort does |
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| 9 | // conditional swaps of pairs of elements with mixed types (int/double). |
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| 10 | |
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| 11 | #include <algorithm> |
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| 12 | #include <cstddef> |
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| 13 | #include <cstdio> |
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| 14 | #include <utility> |
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| 15 | #include <vector> |
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| 16 | |
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| 17 | extern "C" void __nsan_dump_shadow_mem(const char *addr, size_t size_bytes, |
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| 18 | size_t bytes_per_line, size_t reserved); |
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| 19 | |
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| 20 | __attribute__((noinline)) void Run(std::vector<int> &indices, |
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| 21 | std::vector<double> &values) { |
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| 22 | const auto num_entries = indices.size(); |
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| 23 | std::vector<std::pair<int, double>> entries; |
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| 24 | entries.reserve(num_entries); |
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| 25 | for (size_t i = 0; i < num_entries; ++i) |
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| 26 | entries.emplace_back(indices[i], values[i]); |
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| 27 | |
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| 28 | __nsan_dump_shadow_mem((const char *)&entries[0].second, sizeof(double), |
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| 29 | sizeof(double), 0); |
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| 30 | __nsan_dump_shadow_mem((const char *)&entries[1].second, sizeof(double), |
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| 31 | sizeof(double), 0); |
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| 32 | // CHECK: {{.*}}: d0 d1 d2 d3 d4 d5 d6 d7 (1.02800000000000002487) |
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| 33 | // CHECK-NEXT: {{.*}}: d0 d1 d2 d3 d4 d5 d6 d7 (7.95099999999999962341) |
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| 34 | std::stable_sort( |
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| 35 | entries.begin(), entries.end(), |
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| 36 | [](const std::pair<int, double> &a, const std::pair<int, double> &b) { |
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| 37 | return a.first < b.first; |
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| 38 | }); |
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| 39 | __nsan_dump_shadow_mem((const char *)&entries[0].second, sizeof(double), |
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| 40 | sizeof(double), 0); |
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| 41 | __nsan_dump_shadow_mem((const char *)&entries[1].second, sizeof(double), |
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| 42 | sizeof(double), 0); |
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| 43 | // We make sure that the shadow values have been swapped correctly. |
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| 44 | // CHECK-NEXT: {{.*}}: d0 d1 d2 d3 d4 d5 d6 d7 (7.95099999999999962341) |
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| 45 | // CHECK-NEXT: {{.*}}: d0 d1 d2 d3 d4 d5 d6 d7 (1.02800000000000002487) |
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| 46 | } |
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| 47 | |
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| 48 | int main() { |
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| 49 | std::vector<int> indices; |
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| 50 | std::vector<double> values; |
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| 51 | indices.push_back(75); |
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| 52 | values.push_back(1.028); |
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| 53 | indices.push_back(74); |
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| 54 | values.push_back(7.951); |
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| 55 | Run(indices, values); |
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| 56 | } |
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| 57 | |
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