derek.holloway
7502bf64a4
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79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___NEW_ALLOCATE_H
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#define _LIBCPP___NEW_ALLOCATE_H
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#include <__config>
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#include <__cstddef/max_align_t.h>
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#include <__cstddef/size_t.h>
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#include <__new/align_val_t.h>
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#include <__type_traits/type_identity.h>
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#include <__utility/element_count.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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_LIBCPP_CONSTEXPR inline _LIBCPP_HIDE_FROM_ABI bool __is_overaligned_for_new(size_t __align) _NOEXCEPT {
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#ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__
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return __align > __STDCPP_DEFAULT_NEW_ALIGNMENT__;
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#else
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return __align > _LIBCPP_ALIGNOF(max_align_t);
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#endif
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}
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI _Tp*
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__libcpp_allocate(__element_count __n, [[__maybe_unused__]] size_t __align = _LIBCPP_ALIGNOF(_Tp)) {
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size_t __size = static_cast<size_t>(__n) * sizeof(_Tp);
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#if _LIBCPP_HAS_ALIGNED_ALLOCATION
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if (__is_overaligned_for_new(__align))
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return static_cast<_Tp*>(__builtin_operator_new(__size, static_cast<align_val_t>(__align)));
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#endif
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return static_cast<_Tp*>(__builtin_operator_new(__size));
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}
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#if defined(__cpp_sized_deallocation) && __cpp_sized_deallocation >= 201309L
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# define _LIBCPP_ONLY_IF_SIZED_DEALLOCATION(...) __VA_ARGS__
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#else
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# define _LIBCPP_ONLY_IF_SIZED_DEALLOCATION(...) /* nothing */
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#endif
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI void
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__libcpp_deallocate(__type_identity_t<_Tp>* __ptr,
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__element_count __n,
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[[__maybe_unused__]] size_t __align = _LIBCPP_ALIGNOF(_Tp)) _NOEXCEPT {
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[[__maybe_unused__]] size_t __size = static_cast<size_t>(__n) * sizeof(_Tp);
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#if _LIBCPP_HAS_ALIGNED_ALLOCATION
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if (__is_overaligned_for_new(__align))
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return __builtin_operator_delete(
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__ptr _LIBCPP_ONLY_IF_SIZED_DEALLOCATION(, __size), static_cast<align_val_t>(__align));
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#endif
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return __builtin_operator_delete(__ptr _LIBCPP_ONLY_IF_SIZED_DEALLOCATION(, __size));
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}
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#undef _LIBCPP_ONLY_IF_SIZED_DEALLOCATION
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI void __libcpp_deallocate_unsized(
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__type_identity_t<_Tp>* __ptr, [[__maybe_unused__]] size_t __align = _LIBCPP_ALIGNOF(_Tp)) _NOEXCEPT {
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#if _LIBCPP_HAS_ALIGNED_ALLOCATION
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if (__is_overaligned_for_new(__align))
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return __builtin_operator_delete(__ptr, static_cast<align_val_t>(__align));
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#endif
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return __builtin_operator_delete(__ptr);
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___NEW_ALLOCATE_H
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