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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-exception |
| 7 | +// |
| 8 | +//===----------------------------------------------------------------------===// |
| 9 | + |
| 10 | +#ifndef _LIBCPP_SOURCE_LOCATION |
| 11 | +#define _LIBCPP_SOURCE_LOCATION |
| 12 | + |
| 13 | +/* source_location synopsis |
| 14 | +
|
| 15 | +namespace 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 && __has_builtin(__builtin_source_location) |
| 39 | + |
| 40 | +class 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 | + |
| 57 | +public: |
| 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 && __has_builtin(__builtin_source_location) |
| 82 | + |
| 83 | +_LIBCPP_END_NAMESPACE_STD |
| 84 | + |
| 85 | +#endif // _LIBCPP_SOURCE_LOCATION |
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