Differential D8987 Diff 27152 src/test/fuzz/addition_overflow.cpp

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src/test/fuzz/addition_overflow.cpp

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				// Copyright (c) 2020 The Bitcoin Core developers
				// Distributed under the MIT software license, see the accompanying
				// file COPYING or http://www.opensource.org/licenses/mit-license.php.

				#include <test/fuzz/FuzzedDataProvider.h>
				#include <test/fuzz/fuzz.h>
				#include <test/fuzz/util.h>

				#include <cstdint>
				#include <string>
				#include <vector>

				#if defined(__has_builtin)
				#if __has_builtin(__builtin_add_overflow)
				#define HAVE_BUILTIN_ADD_OVERFLOW
				#endif
				#elif defined(__GNUC__) && (__GNUC__ >= 5)
				#define HAVE_BUILTIN_ADD_OVERFLOW
				#endif

				namespace {
				template <typename T>
				void TestAdditionOverflow(FuzzedDataProvider &fuzzed_data_provider) {
				const T i = fuzzed_data_provider.ConsumeIntegral<T>();
				const T j = fuzzed_data_provider.ConsumeIntegral<T>();
				const bool is_addition_overflow_custom = AdditionOverflow(i, j);
				#if defined(HAVE_BUILTIN_ADD_OVERFLOW)
				T result_builtin;
				const bool is_addition_overflow_builtin =
				__builtin_add_overflow(i, j, &result_builtin);
				assert(is_addition_overflow_custom == is_addition_overflow_builtin);
				if (!is_addition_overflow_custom) {
				assert(i + j == result_builtin);
				}
				#else
				if (!is_addition_overflow_custom) {
				(void)(i + j);
				}
				#endif
				}
				} // namespace

				void test_one_input(const std::vector<uint8_t> &buffer) {
				FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
				TestAdditionOverflow<int64_t>(fuzzed_data_provider);
				TestAdditionOverflow<uint64_t>(fuzzed_data_provider);
				TestAdditionOverflow<int32_t>(fuzzed_data_provider);
				TestAdditionOverflow<uint32_t>(fuzzed_data_provider);
				TestAdditionOverflow<int16_t>(fuzzed_data_provider);
				TestAdditionOverflow<uint16_t>(fuzzed_data_provider);
				TestAdditionOverflow<char>(fuzzed_data_provider);
				TestAdditionOverflow<uint8_t>(fuzzed_data_provider);
				TestAdditionOverflow<signed char>(fuzzed_data_provider);
				}