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c2a42381c1
AppleClang 1403 has some bugs that prevent std::source_location from working properly on it. Consequently, we XFAILed the unit test for source_location with that compiler. However, we should also avoid advertising that the feature is supported on that compiler, otherwise our feature-test macros lie. This was noticed to break Boost.Asio when building with a recent libc++ and AppleClang 14.0.3. rdar://106863087 Differential Revision: https://reviews.llvm.org/D146837
88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_SOURCE_LOCATION
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#define _LIBCPP_SOURCE_LOCATION
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/* source_location synopsis
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namespace std {
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struct source_location {
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static consteval source_location current() noexcept;
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constexpr source_location() noexcept;
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constexpr uint_least32_t line() const noexcept;
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constexpr uint_least32_t column() const noexcept;
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constexpr const char* file_name() const noexcept;
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constexpr const char* function_name() const noexcept;
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};
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}
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*/
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#include <__config>
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#include <cstdint>
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#include <version>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location) && \
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!(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER <= 1403)
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class source_location {
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// The names source_location::__impl, _M_file_name, _M_function_name, _M_line, and _M_column
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// are hard-coded in the compiler and must not be changed here.
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struct __impl {
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const char* _M_file_name;
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const char* _M_function_name;
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unsigned _M_line;
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unsigned _M_column;
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};
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const __impl* __ptr_ = nullptr;
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// GCC returns the type 'const void*' from the builtin, while clang returns
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// `const __impl*`. Per C++ [expr.const], casts from void* are not permitted
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// in constant evaluation, so we don't want to use `void*` as the argument
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// type unless the builtin returned that, anyhow, and the invalid cast is
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// unavoidable.
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using __bsl_ty = decltype(__builtin_source_location());
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public:
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// The defaulted __ptr argument is necessary so that the builtin is evaluated
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// in the context of the caller. An explicit value should never be provided.
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static consteval source_location current(__bsl_ty __ptr = __builtin_source_location()) noexcept {
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source_location __sl;
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__sl.__ptr_ = static_cast<const __impl*>(__ptr);
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return __sl;
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}
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_LIBCPP_HIDE_FROM_ABI constexpr source_location() noexcept = default;
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_LIBCPP_HIDE_FROM_ABI constexpr uint_least32_t line() const noexcept {
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return __ptr_ != nullptr ? __ptr_->_M_line : 0;
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}
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_LIBCPP_HIDE_FROM_ABI constexpr uint_least32_t column() const noexcept {
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return __ptr_ != nullptr ? __ptr_->_M_column : 0;
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}
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_LIBCPP_HIDE_FROM_ABI constexpr const char* file_name() const noexcept {
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return __ptr_ != nullptr ? __ptr_->_M_file_name : "";
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}
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_LIBCPP_HIDE_FROM_ABI constexpr const char* function_name() const noexcept {
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return __ptr_ != nullptr ? __ptr_->_M_function_name : "";
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}
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};
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#endif // _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location) && !(defined(_LIBCPP_APPLE_CLANG_VER) &&
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// _LIBCPP_APPLE_CLANG_VER <= 1403)
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_SOURCE_LOCATION
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