29 #ifndef _GLIBCXX_MEMORY_RESOURCE
30 #define _GLIBCXX_MEMORY_RESOURCE 1
32 #pragma GCC system_header
34 #if __cplusplus >= 201703L
41 #include <bits/uses_allocator.h>
46 #if ! __cpp_lib_make_obj_using_allocator
51 namespace std _GLIBCXX_VISIBILITY(default)
53 _GLIBCXX_BEGIN_NAMESPACE_VERSION
56 #ifdef _GLIBCXX_HAS_GTHREADS
58 # define __cpp_lib_memory_resource 201603L
61 # define __cpp_lib_memory_resource 1
64 class memory_resource;
66 #if __cplusplus == 201703L
67 template<
typename _Tp>
68 class polymorphic_allocator;
70 # define __cpp_lib_polymorphic_allocator 201902L
71 template<
typename _Tp = std::byte>
72 class polymorphic_allocator;
76 memory_resource* new_delete_resource() noexcept;
77 memory_resource* null_memory_resource() noexcept;
78 memory_resource* set_default_resource(memory_resource* __r) noexcept;
79 memory_resource* get_default_resource() noexcept
80 __attribute__((__returns_nonnull__));
84 #ifdef _GLIBCXX_HAS_GTHREADS
85 class synchronized_pool_resource;
87 class unsynchronized_pool_resource;
88 class monotonic_buffer_resource;
93 static constexpr
size_t _S_max_align =
alignof(max_align_t);
104 allocate(
size_t __bytes,
size_t __alignment = _S_max_align)
105 __attribute__((__returns_nonnull__,__alloc_size__(2),__alloc_align__(3)))
106 {
return do_allocate(__bytes, __alignment); }
109 deallocate(
void* __p,
size_t __bytes,
size_t __alignment = _S_max_align)
110 __attribute__((__nonnull__))
111 {
return do_deallocate(__p, __bytes, __alignment); }
115 {
return do_is_equal(__other); }
119 do_allocate(
size_t __bytes,
size_t __alignment) = 0;
122 do_deallocate(
void* __p,
size_t __bytes,
size_t __alignment) = 0;
130 {
return &__a == &__b || __a.is_equal(__b); }
132 #if __cpp_impl_three_way_comparison < 201907L
134 operator!=(
const memory_resource& __a,
const memory_resource& __b) noexcept
135 {
return !(__a == __b); }
139 template<
typename _Tp>
140 class polymorphic_allocator
144 template<
typename _Up>
145 struct __not_pair {
using type = void; };
147 template<
typename _Up1,
typename _Up2>
148 struct __not_pair<pair<_Up1, _Up2>> { };
151 using value_type = _Tp;
153 polymorphic_allocator() noexcept
154 : _M_resource(get_default_resource())
157 polymorphic_allocator(memory_resource* __r) noexcept
158 __attribute__((__nonnull__))
160 { _GLIBCXX_DEBUG_ASSERT(__r); }
162 polymorphic_allocator(
const polymorphic_allocator& __other) =
default;
164 template<
typename _Up>
165 polymorphic_allocator(
const polymorphic_allocator<_Up>& __x) noexcept
166 : _M_resource(__x.resource())
169 polymorphic_allocator&
170 operator=(
const polymorphic_allocator&) =
delete;
175 __attribute__((__returns_nonnull__))
178 std::__throw_bad_array_new_length();
179 return static_cast<_Tp*
>(_M_resource->allocate(__n *
sizeof(_Tp),
184 deallocate(_Tp* __p,
size_t __n) noexcept
185 __attribute__((__nonnull__))
186 { _M_resource->deallocate(__p, __n *
sizeof(_Tp),
alignof(_Tp)); }
188 #if __cplusplus > 201703L
190 allocate_bytes(
size_t __nbytes,
191 size_t __alignment =
alignof(max_align_t))
192 {
return _M_resource->allocate(__nbytes, __alignment); }
195 deallocate_bytes(
void* __p,
size_t __nbytes,
196 size_t __alignment =
alignof(max_align_t))
197 { _M_resource->deallocate(__p, __nbytes, __alignment); }
199 template<
typename _Up>
201 allocate_object(
size_t __n = 1)
204 std::__throw_bad_array_new_length();
205 return static_cast<_Up*
>(allocate_bytes(__n *
sizeof(_Up),
209 template<
typename _Up>
211 deallocate_object(_Up* __p,
size_t __n = 1)
212 { deallocate_bytes(__p, __n *
sizeof(_Up),
alignof(_Up)); }
214 template<
typename _Up,
typename... _CtorArgs>
216 new_object(_CtorArgs&&... __ctor_args)
218 _Up* __p = allocate_object<_Up>();
221 construct(__p, std::forward<_CtorArgs>(__ctor_args)...);
225 deallocate_object(__p);
226 __throw_exception_again;
231 template<
typename _Up>
233 delete_object(_Up* __p)
236 deallocate_object(__p);
240 #if ! __cpp_lib_make_obj_using_allocator
241 template<
typename _Tp1,
typename... _Args>
242 __attribute__((__nonnull__))
243 typename __not_pair<_Tp1>::type
244 construct(_Tp1* __p, _Args&&... __args)
249 = std::__uses_alloc_t<_Tp1, polymorphic_allocator, _Args...>;
250 if constexpr (is_base_of_v<__uses_alloc0, __use_tag>)
251 ::new(__p) _Tp1(std::
forward<_Args>(__args)...);
252 else if constexpr (is_base_of_v<__uses_alloc1_, __use_tag>)
253 ::new(__p) _Tp1(allocator_arg, *this,
254 std::
forward<_Args>(__args)...);
256 ::new(__p) _Tp1(std::
forward<_Args>(__args)..., *this);
259 template<typename _Tp1, typename _Tp2,
260 typename... _Args1, typename... _Args2>
261 __attribute__((__nonnull__))
263 construct(pair<_Tp1, _Tp2>* __p, piecewise_construct_t,
264 tuple<_Args1...> __x, tuple<_Args2...> __y)
267 __use_alloc<_Tp1, polymorphic_allocator, _Args1...>(*this);
269 __use_alloc<_Tp2, polymorphic_allocator, _Args2...>(*this);
274 _S_construct_p(__x_tag, __x_i, __x),
275 _S_construct_p(__y_tag, __y_i, __y));
278 template<typename _Tp1, typename _Tp2>
279 __attribute__((__nonnull__))
281 construct(pair<_Tp1, _Tp2>* __p)
282 { this->construct(__p, piecewise_construct, tuple<>(), tuple<>()); }
284 template<
typename _Tp1,
typename _Tp2,
typename _Up,
typename _Vp>
285 __attribute__((__nonnull__))
287 construct(pair<_Tp1, _Tp2>* __p, _Up&& __x, _Vp&& __y)
289 this->construct(__p, piecewise_construct,
294 template <
typename _Tp1,
typename _Tp2,
typename _Up,
typename _Vp>
295 __attribute__((__nonnull__))
297 construct(pair<_Tp1, _Tp2>* __p, const std::pair<_Up, _Vp>& __pr)
299 this->construct(__p, piecewise_construct,
304 template<
typename _Tp1,
typename _Tp2,
typename _Up,
typename _Vp>
305 __attribute__((__nonnull__))
307 construct(pair<_Tp1, _Tp2>* __p, pair<_Up, _Vp>&& __pr)
309 this->construct(__p, piecewise_construct,
313 #else // make_obj_using_allocator
314 template<
typename _Tp1,
typename... _Args>
315 __attribute__((__nonnull__))
317 construct(_Tp1* __p, _Args&&... __args)
319 std::uninitialized_construct_using_allocator(__p, *
this,
320 std::forward<_Args>(__args)...);
324 template<
typename _Up>
325 __attribute__((__nonnull__))
330 polymorphic_allocator
331 select_on_container_copy_construction() const noexcept
332 {
return polymorphic_allocator(); }
335 resource() const noexcept
336 __attribute__((__returns_nonnull__))
337 {
return _M_resource; }
340 using __uses_alloc1_ = __uses_alloc1<polymorphic_allocator>;
341 using __uses_alloc2_ = __uses_alloc2<polymorphic_allocator>;
343 #if ! __cpp_lib_make_obj_using_allocator
344 template<
typename _Ind,
typename... _Args>
345 static tuple<_Args&&...>
346 _S_construct_p(__uses_alloc0, _Ind, tuple<_Args...>& __t)
349 template<
size_t... _Ind,
typename... _Args>
350 static tuple<allocator_arg_t, polymorphic_allocator, _Args&&...>
351 _S_construct_p(__uses_alloc1_ __ua, index_sequence<_Ind...>,
352 tuple<_Args...>& __t)
355 allocator_arg, *__ua._M_a, std::get<_Ind>(
std::move(__t))...
359 template<
size_t... _Ind,
typename... _Args>
360 static tuple<_Args&&..., polymorphic_allocator>
361 _S_construct_p(__uses_alloc2_ __ua, index_sequence<_Ind...>,
362 tuple<_Args...>& __t)
363 {
return { std::get<_Ind>(
std::move(__t))..., *__ua._M_a }; }
366 memory_resource* _M_resource;
369 template<
typename _Tp1,
typename _Tp2>
371 operator==(
const polymorphic_allocator<_Tp1>& __a,
372 const polymorphic_allocator<_Tp2>& __b) noexcept
373 {
return *__a.resource() == *__b.resource(); }
375 #if __cpp_impl_three_way_comparison < 201907L
376 template<
typename _Tp1,
typename _Tp2>
378 operator!=(
const polymorphic_allocator<_Tp1>& __a,
379 const polymorphic_allocator<_Tp2>& __b) noexcept
380 {
return !(__a == __b); }
391 size_t max_blocks_per_chunk = 0;
398 size_t largest_required_pool_block = 0;
402 class __pool_resource
407 __pool_resource(
const pool_options& __opts,
memory_resource* __upstream);
411 __pool_resource(
const __pool_resource&) =
delete;
412 __pool_resource&
operator=(
const __pool_resource&) =
delete;
416 allocate(
size_t __bytes,
size_t __alignment);
420 deallocate(
void* __p,
size_t __bytes,
size_t __alignment);
427 {
return _M_unpooled.get_allocator().resource(); }
431 _Pool* _M_alloc_pools();
433 const pool_options _M_opts;
438 _GLIBCXX_STD_C::pmr::vector<_BigBlock> _M_unpooled;
443 #ifdef _GLIBCXX_HAS_GTHREADS
450 __attribute__((__nonnull__));
458 __attribute__((__nonnull__))
476 upstream_resource()
const noexcept
477 __attribute__((__returns_nonnull__))
478 {
return _M_impl.resource(); }
480 pool_options options()
const noexcept {
return _M_impl._M_opts; }
484 do_allocate(
size_t __bytes,
size_t __alignment)
override;
487 do_deallocate(
void* __p,
size_t __bytes,
size_t __alignment)
override;
491 {
return this == &__other; }
500 auto _M_thread_specific_pools() noexcept;
502 __pool_resource _M_impl;
503 __gthread_key_t _M_key;
505 _TPools* _M_tpools =
nullptr;
514 [[__gnu__::__nonnull__]]
522 [[__gnu__::__nonnull__]]
541 [[__gnu__::__returns_nonnull__]]
543 upstream_resource()
const noexcept
544 {
return _M_impl.resource(); }
546 pool_options options()
const noexcept {
return _M_impl._M_opts; }
550 do_allocate(
size_t __bytes,
size_t __alignment)
override;
553 do_deallocate(
void* __p,
size_t __bytes,
size_t __alignment)
override;
557 {
return this == &__other; }
560 using _Pool = __pool_resource::_Pool;
562 auto _M_find_pool(
size_t) noexcept;
564 __pool_resource _M_impl;
565 _Pool* _M_pools =
nullptr;
573 __attribute__((__nonnull__))
574 : _M_upstream(__upstream)
575 { _GLIBCXX_DEBUG_ASSERT(__upstream !=
nullptr); }
577 monotonic_buffer_resource(
size_t __initial_size,
578 memory_resource* __upstream) noexcept
579 __attribute__((__nonnull__))
580 : _M_next_bufsiz(__initial_size),
581 _M_upstream(__upstream)
583 _GLIBCXX_DEBUG_ASSERT(__upstream !=
nullptr);
584 _GLIBCXX_DEBUG_ASSERT(__initial_size > 0);
587 monotonic_buffer_resource(
void* __buffer,
size_t __buffer_size,
588 memory_resource* __upstream) noexcept
589 __attribute__((__nonnull__(4)))
590 : _M_current_buf(__buffer), _M_avail(__buffer_size),
591 _M_next_bufsiz(_S_next_bufsize(__buffer_size)),
592 _M_upstream(__upstream),
593 _M_orig_buf(__buffer), _M_orig_size(__buffer_size)
595 _GLIBCXX_DEBUG_ASSERT(__upstream !=
nullptr);
596 _GLIBCXX_DEBUG_ASSERT(__buffer !=
nullptr || __buffer_size == 0);
599 monotonic_buffer_resource() noexcept
600 : monotonic_buffer_resource(get_default_resource())
604 monotonic_buffer_resource(
size_t __initial_size) noexcept
605 : monotonic_buffer_resource(__initial_size, get_default_resource())
608 monotonic_buffer_resource(
void* __buffer,
size_t __buffer_size) noexcept
609 : monotonic_buffer_resource(__buffer, __buffer_size, get_default_resource())
612 monotonic_buffer_resource(
const monotonic_buffer_resource&) =
delete;
614 virtual ~monotonic_buffer_resource();
616 monotonic_buffer_resource&
617 operator=(
const monotonic_buffer_resource&) =
delete;
623 _M_release_buffers();
626 if ((_M_current_buf = _M_orig_buf))
628 _M_avail = _M_orig_size;
629 _M_next_bufsiz = _S_next_bufsize(_M_orig_size);
634 _M_next_bufsiz = _M_orig_size;
639 upstream_resource() const noexcept
640 __attribute__((__returns_nonnull__))
641 {
return _M_upstream; }
645 do_allocate(
size_t __bytes,
size_t __alignment)
override
647 if (__builtin_expect(__bytes == 0,
false))
650 void* __p =
std::align(__alignment, __bytes, _M_current_buf, _M_avail);
651 if (__builtin_expect(__p ==
nullptr,
false))
653 _M_new_buffer(__bytes, __alignment);
654 __p = _M_current_buf;
656 _M_current_buf = (
char*)_M_current_buf + __bytes;
662 do_deallocate(
void*,
size_t,
size_t)
override
666 do_is_equal(
const memory_resource& __other)
const noexcept
override
667 {
return this == &__other; }
673 _M_new_buffer(
size_t __bytes,
size_t __alignment);
677 _M_release_buffers() noexcept;
680 _S_next_bufsize(
size_t __buffer_size) noexcept
682 if (__builtin_expect(__buffer_size == 0,
false))
684 return __buffer_size * _S_growth_factor;
687 static constexpr
size_t _S_init_bufsize = 128 *
sizeof(
void*);
688 static constexpr
float _S_growth_factor = 1.5;
690 void* _M_current_buf =
nullptr;
692 size_t _M_next_bufsiz = _S_init_bufsize;
695 memory_resource*
const _M_upstream;
696 void*
const _M_orig_buf =
nullptr;
697 size_t const _M_orig_size = _M_next_bufsiz;
700 _Chunk* _M_head =
nullptr;
704 _GLIBCXX_END_NAMESPACE_VERSION
708 #endif // _GLIBCXX_MEMORY_RESOURCE
constexpr tuple< _Elements &&...> forward_as_tuple(_Elements &&...__args) noexcept
std::forward_as_tuple
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
A simple scoped lock type.
void * align(size_t __align, size_t __size, void *&__ptr, size_t &__space) noexcept
Fit aligned storage in buffer.
element_type * release()
Bypassing the smart pointer.
constexpr piecewise_construct_t piecewise_construct
Tag for piecewise construction of std::pair objects.
constexpr _Tp && forward(typename std::remove_reference< _Tp >::type &__t) noexcept
Forward an lvalue.
The standard shared mutex type.
A thread-safe memory resource that manages pools of fixed-size blocks.
make_index_sequence< sizeof...(_Types)> index_sequence_for
Alias template index_sequence_for.
__numeric_traits_integer< _Tp > __int_traits
Convenience alias for __numeric_traits<integer-type>.
A non-thread-safe memory resource that manages pools of fixed-size blocks.
auto_ptr & operator=(auto_ptr &__a)
auto_ptr assignment operator.