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1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP_SOURCE_LOCATION11#define _LIBCPP_SOURCE_LOCATION12 13/* source_location synopsis14 15namespace std {16 struct source_location {17 static consteval source_location current() noexcept;18 constexpr source_location() noexcept;19 20 constexpr uint_least32_t line() const noexcept;21 constexpr uint_least32_t column() const noexcept;22 constexpr const char* file_name() const noexcept;23 constexpr const char* function_name() const noexcept;24 };25}26*/27 28#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)29# include <__cxx03/__config>30#else31# include <__config>32# include <cstdint>33# include <version>34 35# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)36# pragma GCC system_header37# endif38 39_LIBCPP_BEGIN_NAMESPACE_STD40 41# if _LIBCPP_STD_VER >= 2042 43class source_location {44 // The names source_location::__impl, _M_file_name, _M_function_name, _M_line, and _M_column45 // are hard-coded in the compiler and must not be changed here.46 struct __impl {47 const char* _M_file_name;48 const char* _M_function_name;49 unsigned _M_line;50 unsigned _M_column;51 };52 const __impl* __ptr_ = nullptr;53 // GCC returns the type 'const void*' from the builtin, while clang returns54 // `const __impl*`. Per C++ [expr.const], casts from void* are not permitted55 // in constant evaluation, so we don't want to use `void*` as the argument56 // type unless the builtin returned that, anyhow, and the invalid cast is57 // unavoidable.58 using __bsl_ty _LIBCPP_NODEBUG = decltype(__builtin_source_location());59 60public:61 // The defaulted __ptr argument is necessary so that the builtin is evaluated62 // in the context of the caller. An explicit value should never be provided.63 static consteval source_location current(__bsl_ty __ptr = __builtin_source_location()) noexcept {64 source_location __sl;65 __sl.__ptr_ = static_cast<const __impl*>(__ptr);66 return __sl;67 }68 _LIBCPP_HIDE_FROM_ABI constexpr source_location() noexcept = default;69 70 _LIBCPP_HIDE_FROM_ABI constexpr uint_least32_t line() const noexcept {71 return __ptr_ != nullptr ? __ptr_->_M_line : 0;72 }73 _LIBCPP_HIDE_FROM_ABI constexpr uint_least32_t column() const noexcept {74 return __ptr_ != nullptr ? __ptr_->_M_column : 0;75 }76 _LIBCPP_HIDE_FROM_ABI constexpr const char* file_name() const noexcept {77 return __ptr_ != nullptr ? __ptr_->_M_file_name : "";78 }79 _LIBCPP_HIDE_FROM_ABI constexpr const char* function_name() const noexcept {80 return __ptr_ != nullptr ? __ptr_->_M_function_name : "";81 }82};83 84# endif // _LIBCPP_STD_VER >= 2085 86_LIBCPP_END_NAMESPACE_STD87 88#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)89 90#endif // _LIBCPP_SOURCE_LOCATION91