| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <string> |
| |
| // This test ensures that the correct max_size() is returned depending on the platform. |
| |
| #include <algorithm> |
| #include <cassert> |
| #include <cstddef> |
| #include <string> |
| |
| #include "test_macros.h" |
| |
| // alignment of the string heap buffer is hardcoded to 16 |
| static const std::size_t alignment = 16; |
| |
| template <class = int> |
| TEST_CONSTEXPR_CXX20 void full_size() { |
| std::string str; |
| assert(str.max_size() == std::numeric_limits<std::size_t>::max() - alignment); |
| |
| #ifndef TEST_HAS_NO_CHAR8_T |
| std::u8string u8str; |
| assert(u8str.max_size() == std::numeric_limits<std::size_t>::max() - alignment); |
| #endif |
| |
| #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| std::wstring wstr; |
| assert(wstr.max_size() == std::numeric_limits<std::size_t>::max() / sizeof(wchar_t) - alignment); |
| #endif |
| |
| std::u16string u16str; |
| std::u32string u32str; |
| assert(u16str.max_size() == std::numeric_limits<std::size_t>::max() / 2 - alignment); |
| assert(u32str.max_size() == std::numeric_limits<std::size_t>::max() / 4 - alignment); |
| } |
| |
| template <class = int> |
| TEST_CONSTEXPR_CXX20 void half_size() { |
| std::string str; |
| assert(str.max_size() == std::numeric_limits<std::size_t>::max() / 2 - alignment); |
| |
| #ifndef TEST_HAS_NO_CHAR8_T |
| std::u8string u8str; |
| assert(u8str.max_size() == std::numeric_limits<std::size_t>::max() / 2 - alignment); |
| #endif |
| |
| #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| std::wstring wstr; |
| assert(wstr.max_size() == std::numeric_limits<std::size_t>::max() / std::max<size_t>(2ul, sizeof(wchar_t)) - alignment); |
| #endif |
| |
| std::u16string u16str; |
| std::u32string u32str; |
| assert(u16str.max_size() == std::numeric_limits<std::size_t>::max() / 2 - alignment); |
| assert(u32str.max_size() == std::numeric_limits<std::size_t>::max() / 4 - alignment); |
| } |
| |
| TEST_CONSTEXPR_CXX20 bool test() { |
| |
| #if _LIBCPP_ABI_VERSION == 1 |
| |
| # if defined(__x86_64__) || defined(__i386__) |
| full_size(); |
| # elif defined(__APPLE__) && defined(__aarch64__) |
| half_size(); |
| # elif defined(__arm__) || defined(__aarch64__) |
| # ifdef __BIG_ENDIAN__ |
| half_size(); |
| # else |
| full_size(); |
| # endif |
| # elif defined(__powerpc__) || defined(__powerpc64__) |
| # ifdef __BIG_ENDIAN__ |
| half_size(); |
| # else |
| full_size(); |
| # endif |
| # elif defined(__sparc64__) |
| half_size(); |
| # elif defined(_WIN32) |
| full_size(); |
| # else |
| # error "Your target system seems to be unsupported." |
| # endif |
| |
| #else |
| |
| half_size(); |
| |
| #endif |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| #if TEST_STD_VER > 17 |
| static_assert(test()); |
| #endif |
| |
| return 0; |
| } |