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-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_SOURCE_LOCATION 11#define _LIBCPP_SOURCE_LOCATION 12 13/* source_location synopsis 14 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/source_location> 30#else 31# include <__config> 32# include <cstdint> 33# include <version> 34 35# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 36# pragma GCC system_header 37# endif 38 39_LIBCPP_BEGIN_NAMESPACE_STD 40 41# if _LIBCPP_STD_VER >= 20 42 43class source_location { 44 // The names source_location::__impl, _M_file_name, _M_function_name, _M_line, and _M_column 45 // 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 returns 54 // `const __impl*`. Per C++ [expr.const], casts from void* are not permitted 55 // in constant evaluation, so we don't want to use `void*` as the argument 56 // type unless the builtin returned that, anyhow, and the invalid cast is 57 // 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 evaluated 62 // 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 >= 20 85 86_LIBCPP_END_NAMESPACE_STD 87 88#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) 89 90#endif // _LIBCPP_SOURCE_LOCATION 91