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427 lines
13 KiB
C++
427 lines
13 KiB
C++
// -*- C++ -*-
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//===------------------------ memory_resource -----------------------------===//
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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_EXPERIMENTAL_MEMORY_RESOURCE
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#define _LIBCPP_EXPERIMENTAL_MEMORY_RESOURCE
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/**
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experimental/memory_resource synopsis
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// C++1y
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namespace std {
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namespace experimental {
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inline namespace fundamentals_v1 {
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namespace pmr {
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class memory_resource;
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bool operator==(const memory_resource& a,
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const memory_resource& b) noexcept;
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bool operator!=(const memory_resource& a,
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const memory_resource& b) noexcept;
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template <class Tp> class polymorphic_allocator;
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template <class T1, class T2>
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bool operator==(const polymorphic_allocator<T1>& a,
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const polymorphic_allocator<T2>& b) noexcept;
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template <class T1, class T2>
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bool operator!=(const polymorphic_allocator<T1>& a,
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const polymorphic_allocator<T2>& b) noexcept;
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// The name resource_adaptor_imp is for exposition only.
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template <class Allocator> class resource_adaptor_imp;
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template <class Allocator>
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using resource_adaptor = resource_adaptor_imp<
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allocator_traits<Allocator>::rebind_alloc<char>>;
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// Global memory resources
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memory_resource* new_delete_resource() noexcept;
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memory_resource* null_memory_resource() noexcept;
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// The default memory resource
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memory_resource* set_default_resource(memory_resource* r) noexcept;
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memory_resource* get_default_resource() noexcept;
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// Standard memory resources
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struct pool_options;
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class synchronized_pool_resource;
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class unsynchronized_pool_resource;
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class monotonic_buffer_resource;
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} // namespace pmr
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} // namespace fundamentals_v1
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} // namespace experimental
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} // namespace std
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*/
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#include <experimental/__config>
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#include <experimental/__memory>
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#include <limits>
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#include <memory>
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#include <new>
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#include <stdexcept>
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#include <__tuple>
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#include <type_traits>
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#include <utility>
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#include <cstddef>
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#include <cstdlib>
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#include <__debug>
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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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_LFTS_PMR
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// Round __s up to next multiple of __a.
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inline _LIBCPP_INLINE_VISIBILITY
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size_t __aligned_allocation_size(size_t __s, size_t __a) _NOEXCEPT
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{
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_LIBCPP_ASSERT(__s + __a > __s, "aligned allocation size overflows");
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return (__s + __a - 1) & ~(__a - 1);
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}
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// 8.5, memory.resource
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class _LIBCPP_TYPE_VIS memory_resource
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{
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static const size_t __max_align = _LIBCPP_ALIGNOF(max_align_t);
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// 8.5.2, memory.resource.public
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public:
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virtual ~memory_resource() = default;
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_LIBCPP_INLINE_VISIBILITY
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void* allocate(size_t __bytes, size_t __align = __max_align)
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{ return do_allocate(__bytes, __align); }
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_LIBCPP_INLINE_VISIBILITY
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void deallocate(void * __p, size_t __bytes, size_t __align = __max_align)
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{ do_deallocate(__p, __bytes, __align); }
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_LIBCPP_INLINE_VISIBILITY
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bool is_equal(memory_resource const & __other) const _NOEXCEPT
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{ return do_is_equal(__other); }
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// 8.5.3, memory.resource.priv
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protected:
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virtual void* do_allocate(size_t, size_t) = 0;
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virtual void do_deallocate(void*, size_t, size_t) = 0;
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virtual bool do_is_equal(memory_resource const &) const _NOEXCEPT = 0;
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};
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// 8.5.4, memory.resource.eq
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inline _LIBCPP_INLINE_VISIBILITY
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bool operator==(memory_resource const & __lhs,
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memory_resource const & __rhs) _NOEXCEPT
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{
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return &__lhs == &__rhs || __lhs.is_equal(__rhs);
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}
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inline _LIBCPP_INLINE_VISIBILITY
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bool operator!=(memory_resource const & __lhs,
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memory_resource const & __rhs) _NOEXCEPT
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{
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return !(__lhs == __rhs);
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}
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_LIBCPP_FUNC_VIS
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memory_resource * new_delete_resource() _NOEXCEPT;
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_LIBCPP_FUNC_VIS
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memory_resource * null_memory_resource() _NOEXCEPT;
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_LIBCPP_FUNC_VIS
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memory_resource * get_default_resource() _NOEXCEPT;
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_LIBCPP_FUNC_VIS
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memory_resource * set_default_resource(memory_resource * __new_res) _NOEXCEPT;
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// 8.6, memory.polymorphic.allocator.class
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// 8.6.1, memory.polymorphic.allocator.overview
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template <class _ValueType>
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class _LIBCPP_TEMPLATE_VIS polymorphic_allocator
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{
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public:
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typedef _ValueType value_type;
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// 8.6.2, memory.polymorphic.allocator.ctor
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_LIBCPP_INLINE_VISIBILITY
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polymorphic_allocator() _NOEXCEPT
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: __res_(_VSTD_LFTS_PMR::get_default_resource())
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{}
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_LIBCPP_INLINE_VISIBILITY
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polymorphic_allocator(memory_resource * __r) _NOEXCEPT
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: __res_(__r)
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{}
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polymorphic_allocator(polymorphic_allocator const &) = default;
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY
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polymorphic_allocator(polymorphic_allocator<_Tp> const & __other) _NOEXCEPT
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: __res_(__other.resource())
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{}
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polymorphic_allocator &
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operator=(polymorphic_allocator const &) = delete;
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// 8.6.3, memory.polymorphic.allocator.mem
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_LIBCPP_INLINE_VISIBILITY
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_ValueType* allocate(size_t __n) {
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if (__n > __max_size()) {
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__throw_length_error(
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"std::experimental::pmr::polymorphic_allocator<T>::allocate(size_t n)"
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" 'n' exceeds maximum supported size");
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}
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return static_cast<_ValueType*>(
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__res_->allocate(__n * sizeof(_ValueType), _LIBCPP_ALIGNOF(_ValueType))
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);
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}
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_LIBCPP_INLINE_VISIBILITY
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void deallocate(_ValueType * __p, size_t __n) _NOEXCEPT {
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_LIBCPP_ASSERT(__n <= __max_size(),
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"deallocate called for size which exceeds max_size()");
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__res_->deallocate(__p, __n * sizeof(_ValueType), _LIBCPP_ALIGNOF(_ValueType));
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}
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template <class _Tp, class ..._Ts>
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_LIBCPP_INLINE_VISIBILITY
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void construct(_Tp* __p, _Ts &&... __args)
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{
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_VSTD_LFTS::__lfts_user_alloc_construct(
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__p, *this, _VSTD::forward<_Ts>(__args)...
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);
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}
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template <class _T1, class _T2, class ..._Args1, class ..._Args2>
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_LIBCPP_INLINE_VISIBILITY
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void construct(pair<_T1, _T2>* __p, piecewise_construct_t,
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tuple<_Args1...> __x, tuple<_Args2...> __y)
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{
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::new ((void*)__p) pair<_T1, _T2>(piecewise_construct
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, __transform_tuple(
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typename __lfts_uses_alloc_ctor<
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_T1, polymorphic_allocator&, _Args1...
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>::type()
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, _VSTD::move(__x)
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, typename __make_tuple_indices<sizeof...(_Args1)>::type{}
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)
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, __transform_tuple(
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typename __lfts_uses_alloc_ctor<
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_T2, polymorphic_allocator&, _Args2...
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>::type()
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, _VSTD::move(__y)
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, typename __make_tuple_indices<sizeof...(_Args2)>::type{}
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)
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);
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}
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template <class _T1, class _T2>
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_LIBCPP_INLINE_VISIBILITY
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void construct(pair<_T1, _T2>* __p) {
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construct(__p, piecewise_construct, tuple<>(), tuple<>());
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}
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template <class _T1, class _T2, class _Up, class _Vp>
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_LIBCPP_INLINE_VISIBILITY
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void construct(pair<_T1, _T2> * __p, _Up && __u, _Vp && __v) {
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construct(__p, piecewise_construct
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, _VSTD::forward_as_tuple(_VSTD::forward<_Up>(__u))
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, _VSTD::forward_as_tuple(_VSTD::forward<_Vp>(__v)));
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}
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template <class _T1, class _T2, class _U1, class _U2>
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_LIBCPP_INLINE_VISIBILITY
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void construct(pair<_T1, _T2> * __p, pair<_U1, _U2> const & __pr) {
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construct(__p, piecewise_construct
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, _VSTD::forward_as_tuple(__pr.first)
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, _VSTD::forward_as_tuple(__pr.second));
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}
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template <class _T1, class _T2, class _U1, class _U2>
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_LIBCPP_INLINE_VISIBILITY
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void construct(pair<_T1, _T2> * __p, pair<_U1, _U2> && __pr){
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construct(__p, piecewise_construct
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, _VSTD::forward_as_tuple(_VSTD::forward<_U1>(__pr.first))
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, _VSTD::forward_as_tuple(_VSTD::forward<_U2>(__pr.second)));
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}
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY
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void destroy(_Tp * __p) _NOEXCEPT
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{ __p->~_Tp(); }
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_LIBCPP_INLINE_VISIBILITY
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polymorphic_allocator
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select_on_container_copy_construction() const _NOEXCEPT
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{ return polymorphic_allocator(); }
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_LIBCPP_INLINE_VISIBILITY
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memory_resource * resource() const _NOEXCEPT
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{ return __res_; }
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private:
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template <class ..._Args, size_t ..._Idx>
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_LIBCPP_INLINE_VISIBILITY
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tuple<_Args&&...>
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__transform_tuple(integral_constant<int, 0>, tuple<_Args...>&& __t,
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__tuple_indices<_Idx...>) const
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{
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return _VSTD::forward_as_tuple(_VSTD::get<_Idx>(_VSTD::move(__t))...);
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}
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template <class ..._Args, size_t ..._Idx>
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_LIBCPP_INLINE_VISIBILITY
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tuple<allocator_arg_t const&, polymorphic_allocator&, _Args&&...>
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__transform_tuple(integral_constant<int, 1>, tuple<_Args...> && __t,
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__tuple_indices<_Idx...>)
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{
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using _Tup = tuple<allocator_arg_t const&, polymorphic_allocator&, _Args&&...>;
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return _Tup(allocator_arg, *this,
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_VSTD::get<_Idx>(_VSTD::move(__t))...);
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}
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template <class ..._Args, size_t ..._Idx>
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_LIBCPP_INLINE_VISIBILITY
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tuple<_Args&&..., polymorphic_allocator&>
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__transform_tuple(integral_constant<int, 2>, tuple<_Args...> && __t,
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__tuple_indices<_Idx...>)
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{
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using _Tup = tuple<_Args&&..., polymorphic_allocator&>;
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return _Tup(_VSTD::get<_Idx>(_VSTD::move(__t))..., *this);
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}
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_LIBCPP_INLINE_VISIBILITY
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size_t __max_size() const _NOEXCEPT
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{ return numeric_limits<size_t>::max() / sizeof(value_type); }
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memory_resource * __res_;
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};
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// 8.6.4, memory.polymorphic.allocator.eq
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template <class _Tp, class _Up>
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inline _LIBCPP_INLINE_VISIBILITY
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bool operator==(polymorphic_allocator<_Tp> const & __lhs,
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polymorphic_allocator<_Up> const & __rhs) _NOEXCEPT
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{
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return *__lhs.resource() == *__rhs.resource();
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}
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template <class _Tp, class _Up>
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inline _LIBCPP_INLINE_VISIBILITY
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bool operator!=(polymorphic_allocator<_Tp> const & __lhs,
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polymorphic_allocator<_Up> const & __rhs) _NOEXCEPT
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{
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return !(__lhs == __rhs);
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}
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// 8.7, memory.resource.adaptor
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// 8.7.1, memory.resource.adaptor.overview
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template <class _CharAlloc>
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class _LIBCPP_TEMPLATE_VIS __resource_adaptor_imp
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: public memory_resource
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{
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using _CTraits = allocator_traits<_CharAlloc>;
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static_assert(is_same<typename _CTraits::value_type, char>::value
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&& is_same<typename _CTraits::pointer, char*>::value
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&& is_same<typename _CTraits::void_pointer, void*>::value, "");
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static const size_t _MaxAlign = _LIBCPP_ALIGNOF(max_align_t);
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using _Alloc = typename _CTraits::template rebind_alloc<
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typename aligned_storage<_MaxAlign, _MaxAlign>::type
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>;
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using _ValueType = typename _Alloc::value_type;
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_Alloc __alloc_;
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public:
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typedef _CharAlloc allocator_type;
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__resource_adaptor_imp() = default;
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__resource_adaptor_imp(__resource_adaptor_imp const &) = default;
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__resource_adaptor_imp(__resource_adaptor_imp &&) = default;
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// 8.7.2, memory.resource.adaptor.ctor
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_LIBCPP_INLINE_VISIBILITY
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explicit __resource_adaptor_imp(allocator_type const & __a)
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: __alloc_(__a)
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{}
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_LIBCPP_INLINE_VISIBILITY
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explicit __resource_adaptor_imp(allocator_type && __a)
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: __alloc_(_VSTD::move(__a))
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{}
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__resource_adaptor_imp &
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operator=(__resource_adaptor_imp const &) = default;
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_LIBCPP_INLINE_VISIBILITY
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allocator_type get_allocator() const
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{ return __alloc_; }
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// 8.7.3, memory.resource.adaptor.mem
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protected:
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virtual void * do_allocate(size_t __bytes, size_t)
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{
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if (__bytes > __max_size()) {
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__throw_length_error(
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"std::experimental::pmr::resource_adaptor<T>::do_allocate(size_t bytes, size_t align)"
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" 'bytes' exceeds maximum supported size");
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}
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size_t __s = __aligned_allocation_size(__bytes, _MaxAlign) / _MaxAlign;
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return __alloc_.allocate(__s);
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}
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virtual void do_deallocate(void * __p, size_t __bytes, size_t)
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{
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_LIBCPP_ASSERT(__bytes <= __max_size(),
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"do_deallocate called for size which exceeds the maximum allocation size");
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size_t __s = __aligned_allocation_size(__bytes, _MaxAlign) / _MaxAlign;
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__alloc_.deallocate((_ValueType*)__p, __s);
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}
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virtual bool do_is_equal(memory_resource const & __other) const _NOEXCEPT {
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__resource_adaptor_imp const * __p
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= dynamic_cast<__resource_adaptor_imp const *>(&__other);
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return __p ? __alloc_ == __p->__alloc_ : false;
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}
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private:
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_LIBCPP_INLINE_VISIBILITY
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size_t __max_size() const _NOEXCEPT {
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return numeric_limits<size_t>::max() - _MaxAlign;
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}
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};
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template <class _Alloc>
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using resource_adaptor = __resource_adaptor_imp<
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typename allocator_traits<_Alloc>::template rebind_alloc<char>
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>;
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_LIBCPP_END_NAMESPACE_LFTS_PMR
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_LIBCPP_POP_MACROS
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#endif /* _LIBCPP_EXPERIMENTAL_MEMORY_RESOURCE */
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