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b9a2658a3e
This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
91 lines
3.0 KiB
C++
91 lines
3.0 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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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/source_location>
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#else
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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
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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
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_LIBCPP_END_NAMESPACE_STD
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_SOURCE_LOCATION
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