71 lines
2.2 KiB
C++
71 lines
2.2 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___MEMORY_BUILTIN_NEW_ALLOCATOR_H
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#define _LIBCPP___MEMORY_BUILTIN_NEW_ALLOCATOR_H
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#include <__config>
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#include <__memory/unique_ptr.h>
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#include <cstddef>
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#include <new>
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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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// __builtin_new_allocator -- A non-templated helper for allocating and
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// deallocating memory using __builtin_operator_new and
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// __builtin_operator_delete. It should be used in preference to
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// `std::allocator<T>` to avoid additional instantiations.
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struct __builtin_new_allocator {
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struct __builtin_new_deleter {
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typedef void* pointer_type;
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_LIBCPP_CONSTEXPR explicit __builtin_new_deleter(size_t __size, size_t __align)
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: __size_(__size), __align_(__align) {}
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void operator()(void* __p) const _NOEXCEPT {
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_VSTD::__libcpp_deallocate(__p, __size_, __align_);
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}
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private:
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size_t __size_;
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size_t __align_;
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};
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typedef unique_ptr<void, __builtin_new_deleter> __holder_t;
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static __holder_t __allocate_bytes(size_t __s, size_t __align) {
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return __holder_t(_VSTD::__libcpp_allocate(__s, __align),
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__builtin_new_deleter(__s, __align));
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}
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static void __deallocate_bytes(void* __p, size_t __s,
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size_t __align) _NOEXCEPT {
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_VSTD::__libcpp_deallocate(__p, __s, __align);
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}
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template <class _Tp>
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_LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE
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static __holder_t __allocate_type(size_t __n) {
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return __allocate_bytes(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
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}
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template <class _Tp>
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_LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE
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static void __deallocate_type(void* __p, size_t __n) _NOEXCEPT {
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__deallocate_bytes(__p, __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
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}
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};
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_BUILTIN_NEW_ALLOCATOR_H
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