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