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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_BUILTIN_NEW_ALLOCATOR_H |
| 10 | #define _LIBCPP___CXX03___MEMORY_BUILTIN_NEW_ALLOCATOR_H |
| 11 | |
| 12 | #include <__cxx03/__config> |
| 13 | #include <__cxx03/__memory/unique_ptr.h> |
| 14 | #include <__cxx03/cstddef> |
| 15 | #include <__cxx03/new> |
| 16 | |
| 17 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 18 | # pragma GCC system_header |
| 19 | #endif |
| 20 | |
| 21 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 22 | |
| 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; |
| 30 | |
| 31 | _LIBCPP_HIDE_FROM_ABI explicit __builtin_new_deleter(size_t __size, size_t __align) |
| 32 | : __size_(__size), __align_(__align) {} |
| 33 | |
| 34 | _LIBCPP_HIDE_FROM_ABI void operator()(void* __p) const _NOEXCEPT { |
| 35 | std::__libcpp_deallocate(__p, __size_, __align_); |
| 36 | } |
| 37 | |
| 38 | private: |
| 39 | size_t __size_; |
| 40 | size_t __align_; |
| 41 | }; |
| 42 | |
| 43 | typedef unique_ptr<void, __builtin_new_deleter> __holder_t; |
| 44 | |
| 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)); |
| 47 | } |
| 48 | |
| 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); |
| 51 | } |
| 52 | |
| 53 | template <class _Tp> |
| 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)); |
| 56 | } |
| 57 | |
| 58 | template <class _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)); |
| 62 | } |
| 63 | }; |
| 64 | |
| 65 | _LIBCPP_END_NAMESPACE_STD |
| 66 | |
| 67 | #endif // _LIBCPP___CXX03___MEMORY_BUILTIN_NEW_ALLOCATOR_H |
| 68 |
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