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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___MEMORY_BUILTIN_NEW_ALLOCATOR_H
#define _LIBCPP___MEMORY_BUILTIN_NEW_ALLOCATOR_H
#include <__config>
#include <__memory/unique_ptr.h>
#include <cstddef>
#include <new>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
// __builtin_new_allocator -- A non-templated helper for allocating and
// deallocating memory using __builtin_operator_new and
// __builtin_operator_delete. It should be used in preference to
// `std::allocator<T>` to avoid additional instantiations.
struct __builtin_new_allocator {
struct __builtin_new_deleter {
typedef void* pointer_type;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __builtin_new_deleter(size_t __size, size_t __align)
: __size_(__size), __align_(__align) {}
_LIBCPP_HIDE_FROM_ABI void operator()(void* __p) const _NOEXCEPT {
std::__libcpp_deallocate(__p, __size_, __align_);
}
private:
size_t __size_;
size_t __align_;
};
typedef unique_ptr<void, __builtin_new_deleter> __holder_t;
_LIBCPP_HIDE_FROM_ABI static __holder_t __allocate_bytes(size_t __s, size_t __align) {
return __holder_t(std::__libcpp_allocate(__s, __align),
__builtin_new_deleter(__s, __align));
}
_LIBCPP_HIDE_FROM_ABI static void __deallocate_bytes(void* __p, size_t __s,
size_t __align) _NOEXCEPT {
std::__libcpp_deallocate(__p, __s, __align);
}
template <class _Tp>
_LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE
_LIBCPP_HIDE_FROM_ABI static __holder_t __allocate_type(size_t __n) {
return __allocate_bytes(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
}
template <class _Tp>
_LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE
_LIBCPP_HIDE_FROM_ABI static void __deallocate_type(void* __p, size_t __n) _NOEXCEPT {
__deallocate_bytes(__p, __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
}
};
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___MEMORY_BUILTIN_NEW_ALLOCATOR_H
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