derek.holloway
7502bf64a4
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47 lines
1.8 KiB
C++
47 lines
1.8 KiB
C++
// RUN: %clangxx_nsan -O2 %s -o %t
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// RUN: %run %t 2>&1 | FileCheck %s
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// RUN: %clangxx_nsan -fno-builtin -O2 %s -o %t
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// RUN: %run %t 2>&1 | FileCheck %s
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// This verifies that shadow memory is tracked correcty across typed and
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// bitcasted swaps.
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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#include <utility>
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extern "C" void __nsan_dump_shadow_mem(const char *addr, size_t size_bytes,
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size_t bytes_per_line, size_t reserved);
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__attribute__((noinline)) void SwapFT(double &a, double &b) {
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// LLVM typically optimizes this to an untyped swap (through i64) anyway.
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std::swap(a, b);
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}
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__attribute__((noinline)) void SwapBitcasted(uint64_t &a, uint64_t &b) {
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std::swap(a, b);
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}
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int main() {
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double a = 1.0, b = 2.0;
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__nsan_dump_shadow_mem((const char *)&a, sizeof(a), sizeof(a), 0);
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__nsan_dump_shadow_mem((const char *)&b, sizeof(b), sizeof(b), 0);
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SwapFT(a, b);
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__nsan_dump_shadow_mem((const char *)&a, sizeof(a), sizeof(a), 0);
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__nsan_dump_shadow_mem((const char *)&b, sizeof(b), sizeof(b), 0);
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assert(a == 2.0 && b == 1.0);
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SwapBitcasted(*reinterpret_cast<uint64_t *>(&a),
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*reinterpret_cast<uint64_t *>(&b));
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__nsan_dump_shadow_mem((const char *)&a, sizeof(a), sizeof(a), 0);
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__nsan_dump_shadow_mem((const char *)&b, sizeof(b), sizeof(b), 0);
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assert(a == 1.0 && b == 2.0);
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// CHECK: 0x{{[a-f0-9]*}}: d0 d1 d2 d3 d4 d5 d6 d7 (1.0{{.*}}
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// CHECK-NEXT: 0x{{[a-f0-9]*}}: d0 d1 d2 d3 d4 d5 d6 d7 (2.0{{.*}}
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// CHECK-NEXT: 0x{{[a-f0-9]*}}: d0 d1 d2 d3 d4 d5 d6 d7 (2.0{{.*}}
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// CHECK-NEXT: 0x{{[a-f0-9]*}}: d0 d1 d2 d3 d4 d5 d6 d7 (1.0{{.*}}
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// CHECK-NEXT: 0x{{[a-f0-9]*}}: d0 d1 d2 d3 d4 d5 d6 d7 (1.0{{.*}}
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// CHECK-NEXT: 0x{{[a-f0-9]*}}: d0 d1 d2 d3 d4 d5 d6 d7 (2.0{{.*}}
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}
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