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[libc++] Add regression test for std::hash implementation in ABI v1

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Differential Revision: https://reviews.llvm.org/D144107
This commit is contained in:
Louis Dionne 2023-02-15 10:49:45 -05:00
parent c6c41c31f1
commit 23d43e6977
2 changed files with 51 additions and 2 deletions
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49
libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.abi-v1.pass.cpp Normal file
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@ -0,0 +1,49 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03
// Test that the CityHash implementation returns the results we expect.
//
// Note that this implementation is technically incorrect, however changing it is
// an ABI break. This test ensures that we don't unintentionally break the ABI v1
// by "fixing" the hash implementation.
// REQUIRES: libcpp-abi-version=1
#include <cassert>
#include <string>
#include <utility>
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define CHOOSE_BY_ENDIANESS(little, big) (little)
#else
# define CHOOSE_BY_ENDIANESS(little, big) (big)
#endif
std::string CityHash[] = {
{/* "abcdefgh" */ "\x61\x62\x63\x64\x65\x66\x67\x68"},
{/* "abcDefgh" */ "\x61\x62\x63\x44\x65\x66\x67\x68"},
{/* "CityHash" */ "\x43\x69\x74\x79\x48\x61\x73\x68"},
{/* "CitYHash" */ "\x43\x69\x74\x59\x48\x61\x73\x68"},
};
int main(int, char**) {
const std::pair<std::string, uint64_t> TestCases[] = {
{CityHash[0], CHOOSE_BY_ENDIANESS(0x87c69099911bab7eULL, 0x297621d7fa436a3ULL)},
{CityHash[1], CHOOSE_BY_ENDIANESS(0x87c69099911bab7eULL, 0xb17be531dde56e57ULL)},
{CityHash[2], CHOOSE_BY_ENDIANESS(0x85322632e188694aULL, 0xe14f578b688e266dULL)},
{CityHash[3], CHOOSE_BY_ENDIANESS(0x85322632e188694aULL, 0xca5a764a0450eac6ULL)},
};
std::__murmur2_or_cityhash<uint64_t> h64;
for (const auto& test_case : TestCases) {
assert(h64(test_case.first.data(), test_case.first.size()) == test_case.second);
}
return 0;
}

4
libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.pass.cpp → libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.abi-v2.pass.cpp
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@ -6,10 +6,10 @@
//
//===----------------------------------------------------------------------===//
// Test the CityHash implementation is correct.
// UNSUPPORTED: c++03
// Test that the CityHash implementation is correct.
//
// In ABI v1, our CityHash implementation is incorrect and fixing it would
// be an ABI break.
// REQUIRES: libcpp-abi-version=2