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#include <__config> 29#include <cstdint> 30#include <version> 31 32#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 33# pragma GCC system_header 34#endif 35 36_LIBCPP_BEGIN_NAMESPACE_STD 37 38#if _LIBCPP_STD_VER >= 20 39 40class source_location { 41 // The names source_location::__impl, _M_file_name, _M_function_name, _M_line, and _M_column 42 // are hard-coded in the compiler and must not be changed here. 43 struct __impl { 44 const char* _M_file_name; 45 const char* _M_function_name; 46 unsigned _M_line; 47 unsigned _M_column; 48 }; 49 const __impl* __ptr_ = nullptr; 50 // GCC returns the type 'const void*' from the builtin, while clang returns 51 // `const __impl*`. Per C++ [expr.const], casts from void* are not permitted 52 // in constant evaluation, so we don't want to use `void*` as the argument 53 // type unless the builtin returned that, anyhow, and the invalid cast is 54 // unavoidable. 55 using __bsl_ty = decltype(__builtin_source_location()); 56 57public: 58 // The defaulted __ptr argument is necessary so that the builtin is evaluated 59 // in the context of the caller. An explicit value should never be provided. 60 static consteval source_location current(__bsl_ty __ptr = __builtin_source_location()) noexcept { 61 source_location __sl; 62 __sl.__ptr_ = static_cast<const __impl*>(__ptr); 63 return __sl; 64 } 65 _LIBCPP_HIDE_FROM_ABI constexpr source_location() noexcept = default; 66 67 _LIBCPP_HIDE_FROM_ABI constexpr uint_least32_t line() const noexcept { 68 return __ptr_ != nullptr ? __ptr_->_M_line : 0; 69 } 70 _LIBCPP_HIDE_FROM_ABI constexpr uint_least32_t column() const noexcept { 71 return __ptr_ != nullptr ? __ptr_->_M_column : 0; 72 } 73 _LIBCPP_HIDE_FROM_ABI constexpr const char* file_name() const noexcept { 74 return __ptr_ != nullptr ? __ptr_->_M_file_name : ""; 75 } 76 _LIBCPP_HIDE_FROM_ABI constexpr const char* function_name() const noexcept { 77 return __ptr_ != nullptr ? __ptr_->_M_function_name : ""; 78 } 79}; 80 81#endif // _LIBCPP_STD_VER >= 20 82 83_LIBCPP_END_NAMESPACE_STD 84 85#endif // _LIBCPP_SOURCE_LOCATION 86