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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___CXX03___MEMORY_ALIGNED_ALLOC_H |
| 10 | #define _LIBCPP___CXX03___MEMORY_ALIGNED_ALLOC_H |
| 11 | |
| 12 | #include <__cxx03/__config> |
| 13 | #include <__cxx03/cstddef> |
| 14 | #include <__cxx03/cstdlib> |
| 15 | |
| 16 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 17 | # pragma GCC system_header |
| 18 | #endif |
| 19 | |
| 20 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 21 | |
| 22 | #ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION |
| 23 | |
| 24 | // Low-level helpers to call the aligned allocation and deallocation functions |
| 25 | // on the target platform. This is used to implement libc++'s own memory |
| 26 | // allocation routines -- if you need to allocate memory inside the library, |
| 27 | // chances are that you want to use `__libcpp_allocate` instead. |
| 28 | // |
| 29 | // Returns the allocated memory, or `nullptr` on failure. |
| 30 | inline _LIBCPP_HIDE_FROM_ABI void* __libcpp_aligned_alloc(std::size_t __alignment, std::size_t __size) { |
| 31 | # if defined(_LIBCPP_MSVCRT_LIKE) |
| 32 | return ::_aligned_malloc(__size, __alignment); |
| 33 | # else |
| 34 | void* __result = nullptr; |
| 35 | (void)::posix_memalign(&__result, __alignment, __size); |
| 36 | // If posix_memalign fails, __result is unmodified so we still return `nullptr`. |
| 37 | return __result; |
| 38 | # endif |
| 39 | } |
| 40 | |
| 41 | inline _LIBCPP_HIDE_FROM_ABI void __libcpp_aligned_free(void* __ptr) { |
| 42 | # if defined(_LIBCPP_MSVCRT_LIKE) |
| 43 | ::_aligned_free(__ptr); |
| 44 | # else |
| 45 | ::free(__ptr); |
| 46 | # endif |
| 47 | } |
| 48 | |
| 49 | #endif // !_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION |
| 50 | |
| 51 | _LIBCPP_END_NAMESPACE_STD |
| 52 | |
| 53 | #endif // _LIBCPP___CXX03___MEMORY_ALIGNED_ALLOC_H |
| 54 |
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