//===----------------------------------------------------------------------===// // // 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 #include #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` 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 __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 _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 _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