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[ .. KEMBALI ]
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📄 align.h
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EDITING: align.h
// align implementation -*- C++ -*- // Copyright (C) 2014-2021 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file bits/align.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{memory} */ #ifndef _GLIBCXX_ALIGN_H #define _GLIBCXX_ALIGN_H 1 #include <bits/c++config.h> #include <bit> // std::has_single_bit #include <stdint.h> // uintptr_t #include <debug/assertions.h> // _GLIBCXX_DEBUG_ASSERT namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @brief Fit aligned storage in buffer. * * This function tries to fit @a __size bytes of storage with alignment * @a __align into the buffer @a __ptr of size @a __space bytes. If such * a buffer fits then @a __ptr is changed to point to the first byte of the * aligned storage and @a __space is reduced by the bytes used for alignment. * * C++11 20.6.5 [ptr.align] * * @param __align A fundamental or extended alignment value. * @param __size Size of the aligned storage required. * @param __ptr Pointer to a buffer of @a __space bytes. * @param __space Size of the buffer pointed to by @a __ptr. * @return the updated pointer if the aligned storage fits, otherwise nullptr. * * @ingroup memory */ inline void* align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept { if (__space < __size) return nullptr; const auto __intptr = reinterpret_cast<uintptr_t>(__ptr); const auto __aligned = (__intptr - 1u + __align) & -__align; const auto __diff = __aligned - __intptr; if (__diff > (__space - __size)) return nullptr; else { __space -= __diff; return __ptr = reinterpret_cast<void*>(__aligned); } } #if __cplusplus > 201703L #define __cpp_lib_assume_aligned 201811L /** @brief Inform the compiler that a pointer is aligned. * * @tparam _Align An alignment value (i.e. a power of two) * @tparam _Tp An object type * @param __ptr A pointer that is aligned to _Align * * C++20 20.10.6 [ptr.align] * * @ingroup memory */ template<size_t _Align, class _Tp> [[nodiscard,__gnu__::__always_inline__]] constexpr _Tp* assume_aligned(_Tp* __ptr) noexcept { static_assert(std::has_single_bit(_Align)); if (std::is_constant_evaluated()) return __ptr; else { // This function is expected to be used in hot code, where // __glibcxx_assert would add unwanted overhead. _GLIBCXX_DEBUG_ASSERT((uintptr_t)__ptr % _Align == 0); return static_cast<_Tp*>(__builtin_assume_aligned(__ptr, _Align)); } } #endif // C++2a _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif /* _GLIBCXX_ALIGN_H */
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