Bitcoin Core  27.99.0
P2P Digital Currency
multiplication_overflow.cpp
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1 // Copyright (c) 2020-2021 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
6 #include <test/fuzz/fuzz.h>
7 #include <test/fuzz/util.h>
8 
9 #include <cstdint>
10 #include <string>
11 #include <vector>
12 
13 namespace {
14 template <typename T>
15 void TestMultiplicationOverflow(FuzzedDataProvider& fuzzed_data_provider)
16 {
17  const T i = fuzzed_data_provider.ConsumeIntegral<T>();
18  const T j = fuzzed_data_provider.ConsumeIntegral<T>();
19  const bool is_multiplication_overflow_custom = MultiplicationOverflow(i, j);
20  T result_builtin;
21  const bool is_multiplication_overflow_builtin = __builtin_mul_overflow(i, j, &result_builtin);
22  assert(is_multiplication_overflow_custom == is_multiplication_overflow_builtin);
23  if (!is_multiplication_overflow_custom) {
24  assert(i * j == result_builtin);
25  }
26 }
27 } // namespace
28 
29 FUZZ_TARGET(multiplication_overflow)
30 {
31  FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
32  TestMultiplicationOverflow<int64_t>(fuzzed_data_provider);
33  TestMultiplicationOverflow<uint64_t>(fuzzed_data_provider);
34  TestMultiplicationOverflow<int32_t>(fuzzed_data_provider);
35  TestMultiplicationOverflow<uint32_t>(fuzzed_data_provider);
36  TestMultiplicationOverflow<int16_t>(fuzzed_data_provider);
37  TestMultiplicationOverflow<uint16_t>(fuzzed_data_provider);
38  TestMultiplicationOverflow<char>(fuzzed_data_provider);
39  TestMultiplicationOverflow<unsigned char>(fuzzed_data_provider);
40  TestMultiplicationOverflow<signed char>(fuzzed_data_provider);
41 }
#define T(expected, seed, data)
FUZZ_TARGET(multiplication_overflow)
bool MultiplicationOverflow(const T i, const T j) noexcept
Definition: util.h:190
assert(!tx.IsCoinBase())