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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 <util/overflow.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__)
#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);
const auto maybe_add{CheckedAdd(i, j)};
const auto sat_add{SaturatingAdd(i, j)};
assert(is_addition_overflow_custom == !maybe_add.has_value());
assert(is_addition_overflow_custom == AdditionOverflow(j, i));
assert(maybe_add == CheckedAdd(j, i));
assert(sat_add == SaturatingAdd(j, i));
#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);
}
#endif
if (is_addition_overflow_custom) {
assert(sat_add == std::numeric_limits<T>::min() || sat_add == std::numeric_limits<T>::max());
} else {
const auto add{i + j};
assert(add == maybe_add.value());
assert(add == sat_add);
}
}
} // namespace
FUZZ_TARGET(addition_overflow)
{
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<unsigned char>(fuzzed_data_provider);
TestAdditionOverflow<signed char>(fuzzed_data_provider);
}
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