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Merge #18393: tests: Don't assume presence of __builtin_mul_overflow(…) in MultiplicationOverflow(…) fuzzing harness

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7c1ac70c01 tests: Don't assume presence of __builtin_mul_overflow in MultiplicationOverflow(...) fuzzing harness (practicalswift)

Pull request description:

  Don't assume presence of `__builtin_mul_overflow(…)` in `MultiplicationOverflow(…)` fuzzing harness.

  Fixes #18389.

ACKs for top commit:
  naumenkogs:
    ACK 7c1ac70

Tree-SHA512: b6f1040a088088ff7e4f5c038f0f710ca2b515387bac3cd249afe97613641f7f3754f61d73d7233f23b8296115fab5bbf656168624a2cb74909577440a49a359
This commit is contained in:
MarcoFalke 2020-03-23 07:39:44 -04:00
commit 97b0687501
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1 changed files with 14 additions and 1 deletions
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15
src/test/fuzz/multiplication_overflow.cpp
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@ -10,6 +10,14 @@
#include <string>
#include <vector>
#if defined(__has_builtin)
#if __has_builtin(__builtin_mul_overflow)
#define HAVE_BUILTIN_MUL_OVERFLOW
#endif
#elif defined(__GNUC__) && (__GNUC__ >= 5)
#define HAVE_BUILTIN_MUL_OVERFLOW
#endif
namespace {
template <typename T>
void TestMultiplicationOverflow(FuzzedDataProvider& fuzzed_data_provider)
@ -17,12 +25,18 @@ void TestMultiplicationOverflow(FuzzedDataProvider& fuzzed_data_provider)
const T i = fuzzed_data_provider.ConsumeIntegral<T>();
const T j = fuzzed_data_provider.ConsumeIntegral<T>();
const bool is_multiplication_overflow_custom = MultiplicationOverflow(i, j);
#if defined(HAVE_BUILTIN_MUL_OVERFLOW)
T result_builtin;
const bool is_multiplication_overflow_builtin = __builtin_mul_overflow(i, j, &result_builtin);
assert(is_multiplication_overflow_custom == is_multiplication_overflow_builtin);
if (!is_multiplication_overflow_custom) {
assert(i * j == result_builtin);
}
#else
if (!is_multiplication_overflow_custom) {
(void)(i * j);
}
#endif
}
} // namespace
@ -38,5 +52,4 @@ void test_one_input(const std::vector<uint8_t>& buffer)
TestMultiplicationOverflow<char>(fuzzed_data_provider);
TestMultiplicationOverflow<unsigned char>(fuzzed_data_provider);
TestMultiplicationOverflow<signed char>(fuzzed_data_provider);
TestMultiplicationOverflow<bool>(fuzzed_data_provider);
}