1 //===----------------------------------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef _LIBCPP___CXX03___MEMORY_BUILTIN_NEW_ALLOCATOR_H
10 #define _LIBCPP___CXX03___MEMORY_BUILTIN_NEW_ALLOCATOR_H
12 #include <__cxx03/__config>
13 #include <__cxx03/__memory/unique_ptr.h>
14 #include <__cxx03/cstddef>
15 #include <__cxx03/new>
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 # pragma GCC system_header
21 _LIBCPP_BEGIN_NAMESPACE_STD
23 // __builtin_new_allocator -- A non-templated helper for allocating and
24 // deallocating memory using __builtin_operator_new and
25 // __builtin_operator_delete. It should be used in preference to
26 // `std::allocator<T>` to avoid additional instantiations.
27 struct __builtin_new_allocator
{
28 struct __builtin_new_deleter
{
29 typedef void* pointer_type
;
31 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
explicit __builtin_new_deleter(size_t __size
, size_t __align
)
32 : __size_(__size
), __align_(__align
) {}
34 _LIBCPP_HIDE_FROM_ABI
void operator()(void* __p
) const _NOEXCEPT
{
35 std::__libcpp_deallocate(__p
, __size_
, __align_
);
43 typedef unique_ptr
<void, __builtin_new_deleter
> __holder_t
;
45 _LIBCPP_HIDE_FROM_ABI
static __holder_t
__allocate_bytes(size_t __s
, size_t __align
) {
46 return __holder_t(std::__libcpp_allocate(__s
, __align
), __builtin_new_deleter(__s
, __align
));
49 _LIBCPP_HIDE_FROM_ABI
static void __deallocate_bytes(void* __p
, size_t __s
, size_t __align
) _NOEXCEPT
{
50 std::__libcpp_deallocate(__p
, __s
, __align
);
54 _LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI
static __holder_t
__allocate_type(size_t __n
) {
55 return __allocate_bytes(__n
* sizeof(_Tp
), _LIBCPP_ALIGNOF(_Tp
));
59 _LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI
static void
60 __deallocate_type(void* __p
, size_t __n
) _NOEXCEPT
{
61 __deallocate_bytes(__p
, __n
* sizeof(_Tp
), _LIBCPP_ALIGNOF(_Tp
));
65 _LIBCPP_END_NAMESPACE_STD
67 #endif // _LIBCPP___CXX03___MEMORY_BUILTIN_NEW_ALLOCATOR_H