29 #ifndef _GLIBCXX_MEMORY_RESOURCE
30 #define _GLIBCXX_MEMORY_RESOURCE 1
32 #pragma GCC system_header
34 #if __cplusplus >= 201703L
45 namespace std _GLIBCXX_VISIBILITY(default)
47 _GLIBCXX_BEGIN_NAMESPACE_VERSION
50 #ifdef _GLIBCXX_HAS_GTHREADS
52 # define __cpp_lib_memory_resource 201603
55 # define __cpp_lib_memory_resource 1
58 class memory_resource;
60 #if __cplusplus == 201703L
61 template<
typename _Tp>
62 class polymorphic_allocator;
64 template<
typename _Tp = std::
byte>
65 class polymorphic_allocator;
69 memory_resource* new_delete_resource() noexcept;
70 memory_resource* null_memory_resource() noexcept;
71 memory_resource* set_default_resource(memory_resource* __r) noexcept;
72 memory_resource* get_default_resource() noexcept
73 __attribute__((__returns_nonnull__));
77 #ifdef _GLIBCXX_HAS_GTHREADS
78 class synchronized_pool_resource;
80 class unsynchronized_pool_resource;
81 class monotonic_buffer_resource;
86 static constexpr
size_t _S_max_align =
alignof(max_align_t);
89 memory_resource() =
default;
90 memory_resource(
const memory_resource&) =
default;
91 virtual ~memory_resource();
93 memory_resource& operator=(
const memory_resource&) =
default;
97 allocate(
size_t __bytes,
size_t __alignment = _S_max_align)
98 __attribute__((__returns_nonnull__,__alloc_size__(2),__alloc_align__(3)))
99 {
return do_allocate(__bytes, __alignment); }
102 deallocate(
void* __p,
size_t __bytes,
size_t __alignment = _S_max_align)
103 __attribute__((__nonnull__))
104 {
return do_deallocate(__p, __bytes, __alignment); }
107 is_equal(
const memory_resource& __other)
const noexcept
108 {
return do_is_equal(__other); }
112 do_allocate(
size_t __bytes,
size_t __alignment) = 0;
115 do_deallocate(
void* __p,
size_t __bytes,
size_t __alignment) = 0;
118 do_is_equal(
const memory_resource& __other)
const noexcept = 0;
122 operator==(
const memory_resource& __a,
const memory_resource& __b) noexcept
123 {
return &__a == &__b || __a.is_equal(__b); }
126 operator!=(
const memory_resource& __a,
const memory_resource& __b) noexcept
127 {
return !(__a == __b); }
131 template<
typename _Tp>
132 class polymorphic_allocator
136 template<
typename _Up>
137 struct __not_pair {
using type = void; };
139 template<
typename _Up1,
typename _Up2>
140 struct __not_pair<pair<_Up1, _Up2>> { };
143 using value_type = _Tp;
145 polymorphic_allocator() noexcept
146 : _M_resource(get_default_resource())
149 polymorphic_allocator(memory_resource* __r) noexcept
150 __attribute__((__nonnull__))
152 { _GLIBCXX_DEBUG_ASSERT(__r); }
154 polymorphic_allocator(
const polymorphic_allocator& __other) =
default;
156 template<
typename _Up>
157 polymorphic_allocator(
const polymorphic_allocator<_Up>& __x) noexcept
158 : _M_resource(__x.resource())
161 polymorphic_allocator&
162 operator=(
const polymorphic_allocator&) =
delete;
167 __attribute__((__returns_nonnull__))
170 std::__throw_bad_alloc();
171 return static_cast<_Tp*>(_M_resource->allocate(__n *
sizeof(_Tp),
176 deallocate(_Tp* __p,
size_t __n) noexcept
177 __attribute__((__nonnull__))
178 { _M_resource->deallocate(__p, __n *
sizeof(_Tp),
alignof(_Tp)); }
180 #if __cplusplus > 201703L
182 allocate_bytes(
size_t __nbytes,
183 size_t __alignment =
alignof(max_align_t))
184 {
return _M_resource->allocate(__nbytes, __alignment); }
187 deallocate_bytes(
void* __p,
size_t __nbytes,
188 size_t __alignment =
alignof(max_align_t))
189 { _M_resource->deallocate(__p, __nbytes, __alignment); }
191 template<
typename _Up>
193 allocate_object(
size_t __n = 1)
196 __throw_length_error(
"polymorphic_allocator::allocate_object");
197 return static_cast<_Up*>(allocate_bytes(__n *
sizeof(_Up),
201 template<
typename _Up>
203 deallocate_object(_Up* __p,
size_t __n = 1)
204 { deallocate_bytes(__p, __n *
sizeof(_Up),
alignof(_Up)); }
206 template<
typename _Up,
typename... _CtorArgs>
208 new_object(_CtorArgs&&... __ctor_args)
210 _Up* __p = allocate_object<_Up>();
213 construct(__p, std::forward<_CtorArgs>(__ctor_args)...);
217 deallocate_object(__p);
218 __throw_exception_again;
223 template<
typename _Up>
225 delete_object(_Up* __p)
228 deallocate_object(__p);
232 #if __cplusplus == 201703L
233 template<
typename _Tp1,
typename... _Args>
234 __attribute__((__nonnull__))
235 typename __not_pair<_Tp1>::type
236 construct(_Tp1* __p, _Args&&... __args)
241 = std::__uses_alloc_t<_Tp1, polymorphic_allocator, _Args...>;
242 if constexpr (is_base_of_v<__uses_alloc0, __use_tag>)
243 ::new(__p) _Tp1(
std::
forward<_Args>(__args)...);
244 else if constexpr (is_base_of_v<__uses_alloc1_, __use_tag>)
245 ::new(__p) _Tp1(allocator_arg, *this,
248 ::new(__p) _Tp1(std::forward<_Args>(__args)..., *
this);
251 template<
typename _Tp1,
typename _Tp2,
252 typename... _Args1,
typename... _Args2>
253 __attribute__((__nonnull__))
255 construct(pair<_Tp1, _Tp2>* __p, piecewise_construct_t,
256 tuple<_Args1...> __x, tuple<_Args2...> __y)
259 __use_alloc<_Tp1, polymorphic_allocator, _Args1...>(*this);
261 __use_alloc<_Tp2, polymorphic_allocator, _Args2...>(*this);
266 _S_construct_p(__x_tag, __x_i, __x),
267 _S_construct_p(__y_tag, __y_i, __y));
270 template<
typename _Tp1,
typename _Tp2>
271 __attribute__((__nonnull__))
273 construct(pair<_Tp1, _Tp2>* __p)
276 template<
typename _Tp1,
typename _Tp2,
typename _Up,
typename _Vp>
277 __attribute__((__nonnull__))
279 construct(pair<_Tp1, _Tp2>* __p, _Up&& __x, _Vp&& __y)
286 template <
typename _Tp1,
typename _Tp2,
typename _Up,
typename _Vp>
287 __attribute__((__nonnull__))
296 template<
typename _Tp1,
typename _Tp2,
typename _Up,
typename _Vp>
297 __attribute__((__nonnull__))
299 construct(pair<_Tp1, _Tp2>* __p, pair<_Up, _Vp>&& __pr)
306 template<
typename _Tp1,
typename... _Args>
307 __attribute__((__nonnull__))
309 construct(_Tp1* __p, _Args&&... __args)
311 std::uninitialized_construct_using_allocator(__p, *
this,
312 std::forward<_Args>(__args)...);
316 template<
typename _Up>
317 __attribute__((__nonnull__))
322 polymorphic_allocator
323 select_on_container_copy_construction() const noexcept
324 {
return polymorphic_allocator(); }
327 resource() const noexcept
328 __attribute__((__returns_nonnull__))
329 {
return _M_resource; }
332 using __uses_alloc1_ = __uses_alloc1<polymorphic_allocator>;
333 using __uses_alloc2_ = __uses_alloc2<polymorphic_allocator>;
335 template<
typename _Ind,
typename... _Args>
336 static tuple<_Args&&...>
337 _S_construct_p(__uses_alloc0, _Ind, tuple<_Args...>& __t)
340 template<
size_t... _Ind,
typename... _Args>
341 static tuple<allocator_arg_t, polymorphic_allocator, _Args&&...>
342 _S_construct_p(__uses_alloc1_ __ua, index_sequence<_Ind...>,
343 tuple<_Args...>& __t)
346 allocator_arg, *__ua._M_a, std::get<_Ind>(
std::move(__t))...
350 template<
size_t... _Ind,
typename... _Args>
351 static tuple<_Args&&..., polymorphic_allocator>
352 _S_construct_p(__uses_alloc2_ __ua, index_sequence<_Ind...>,
353 tuple<_Args...>& __t)
354 {
return { std::get<_Ind>(
std::move(__t))..., *__ua._M_a }; }
356 memory_resource* _M_resource;
359 template<
typename _Tp1,
typename _Tp2>
361 operator==(
const polymorphic_allocator<_Tp1>& __a,
362 const polymorphic_allocator<_Tp2>& __b) noexcept
363 {
return *__a.resource() == *__b.resource(); }
365 template<
typename _Tp1,
typename _Tp2>
367 operator!=(
const polymorphic_allocator<_Tp1>& __a,
368 const polymorphic_allocator<_Tp2>& __b) noexcept
369 {
return !(__a == __b); }
380 size_t max_blocks_per_chunk = 0;
387 size_t largest_required_pool_block = 0;
391 class __pool_resource
393 friend class synchronized_pool_resource;
394 friend class unsynchronized_pool_resource;
396 __pool_resource(
const pool_options& __opts, memory_resource* __upstream);
400 __pool_resource(
const __pool_resource&) =
delete;
401 __pool_resource& operator=(
const __pool_resource&) =
delete;
405 allocate(
size_t __bytes,
size_t __alignment);
409 deallocate(
void* __p,
size_t __bytes,
size_t __alignment);
413 void release() noexcept;
415 memory_resource* resource() const noexcept
416 {
return _M_unpooled.get_allocator().resource(); }
420 _Pool* _M_alloc_pools();
422 const pool_options _M_opts;
427 _GLIBCXX_STD_C::pmr::vector<_BigBlock> _M_unpooled;
432 #ifdef _GLIBCXX_HAS_GTHREADS
434 class synchronized_pool_resource :
public memory_resource
437 synchronized_pool_resource(
const pool_options& __opts,
438 memory_resource* __upstream)
439 __attribute__((__nonnull__));
441 synchronized_pool_resource()
446 synchronized_pool_resource(memory_resource* __upstream)
447 __attribute__((__nonnull__))
448 : synchronized_pool_resource(pool_options(), __upstream)
452 synchronized_pool_resource(
const pool_options& __opts)
455 synchronized_pool_resource(
const synchronized_pool_resource&) =
delete;
457 virtual ~synchronized_pool_resource();
459 synchronized_pool_resource&
460 operator=(
const synchronized_pool_resource&) =
delete;
465 upstream_resource() const noexcept
466 __attribute__((__returns_nonnull__))
467 {
return _M_impl.resource(); }
469 pool_options options() const noexcept {
return _M_impl._M_opts; }
473 do_allocate(
size_t __bytes,
size_t __alignment)
override;
476 do_deallocate(
void* __p,
size_t __bytes,
size_t __alignment)
override;
479 do_is_equal(
const memory_resource& __other)
const noexcept
override
480 {
return this == &__other; }
487 _TPools* _M_alloc_tpools(lock_guard<shared_mutex>&);
488 _TPools* _M_alloc_shared_tpools(lock_guard<shared_mutex>&);
489 auto _M_thread_specific_pools() noexcept;
491 __pool_resource _M_impl;
492 __gthread_key_t _M_key;
494 _TPools* _M_tpools =
nullptr;
495 mutable shared_mutex _M_mx;
500 class unsynchronized_pool_resource :
public memory_resource
503 [[__gnu__::__nonnull__]]
504 unsynchronized_pool_resource(
const pool_options& __opts,
505 memory_resource* __upstream);
507 unsynchronized_pool_resource()
511 [[__gnu__::__nonnull__]]
513 unsynchronized_pool_resource(memory_resource* __upstream)
514 : unsynchronized_pool_resource(pool_options(), __upstream)
518 unsynchronized_pool_resource(
const pool_options& __opts)
521 unsynchronized_pool_resource(
const unsynchronized_pool_resource&) =
delete;
523 virtual ~unsynchronized_pool_resource();
525 unsynchronized_pool_resource&
526 operator=(
const unsynchronized_pool_resource&) =
delete;
530 [[__gnu__::__returns_nonnull__]]
532 upstream_resource() const noexcept
533 {
return _M_impl.resource(); }
535 pool_options options() const noexcept {
return _M_impl._M_opts; }
539 do_allocate(
size_t __bytes,
size_t __alignment)
override;
542 do_deallocate(
void* __p,
size_t __bytes,
size_t __alignment)
override;
545 do_is_equal(
const memory_resource& __other)
const noexcept
override
546 {
return this == &__other; }
549 using _Pool = __pool_resource::_Pool;
551 auto _M_find_pool(
size_t) noexcept;
553 __pool_resource _M_impl;
554 _Pool* _M_pools =
nullptr;
557 class monotonic_buffer_resource :
public memory_resource
561 monotonic_buffer_resource(memory_resource* __upstream) noexcept
562 __attribute__((__nonnull__))
563 : _M_upstream(__upstream)
564 { _GLIBCXX_DEBUG_ASSERT(__upstream !=
nullptr); }
566 monotonic_buffer_resource(
size_t __initial_size,
567 memory_resource* __upstream) noexcept
568 __attribute__((__nonnull__))
569 : _M_next_bufsiz(__initial_size),
570 _M_upstream(__upstream)
572 _GLIBCXX_DEBUG_ASSERT(__upstream !=
nullptr);
573 _GLIBCXX_DEBUG_ASSERT(__initial_size > 0);
576 monotonic_buffer_resource(
void* __buffer,
size_t __buffer_size,
577 memory_resource* __upstream) noexcept
578 __attribute__((__nonnull__(4)))
579 : _M_current_buf(__buffer), _M_avail(__buffer_size),
580 _M_next_bufsiz(_S_next_bufsize(__buffer_size)),
581 _M_upstream(__upstream),
582 _M_orig_buf(__buffer), _M_orig_size(__buffer_size)
584 _GLIBCXX_DEBUG_ASSERT(__upstream !=
nullptr);
585 _GLIBCXX_DEBUG_ASSERT(__buffer !=
nullptr || __buffer_size == 0);
588 monotonic_buffer_resource() noexcept
589 : monotonic_buffer_resource(get_default_resource())
593 monotonic_buffer_resource(
size_t __initial_size) noexcept
597 monotonic_buffer_resource(
void* __buffer,
size_t __buffer_size) noexcept
601 monotonic_buffer_resource(
const monotonic_buffer_resource&) =
delete;
603 virtual ~monotonic_buffer_resource();
605 monotonic_buffer_resource&
606 operator=(
const monotonic_buffer_resource&) =
delete;
612 _M_release_buffers();
615 if ((_M_current_buf = _M_orig_buf))
617 _M_avail = _M_orig_size;
618 _M_next_bufsiz = _S_next_bufsize(_M_orig_size);
623 _M_next_bufsiz = _M_orig_size;
628 upstream_resource() const noexcept
629 __attribute__((__returns_nonnull__))
630 {
return _M_upstream; }
634 do_allocate(
size_t __bytes,
size_t __alignment)
override
639 void* __p =
std::align(__alignment, __bytes, _M_current_buf, _M_avail);
642 _M_new_buffer(__bytes, __alignment);
643 __p = _M_current_buf;
645 _M_current_buf = (
char*)_M_current_buf + __bytes;
651 do_deallocate(
void*,
size_t,
size_t)
override
655 do_is_equal(
const memory_resource& __other)
const noexcept
override
656 {
return this == &__other; }
662 _M_new_buffer(
size_t __bytes,
size_t __alignment);
666 _M_release_buffers() noexcept;
669 _S_next_bufsize(
size_t __buffer_size) noexcept
671 if (__buffer_size == 0)
673 return __buffer_size * _S_growth_factor;
676 static constexpr
size_t _S_init_bufsize = 128 *
sizeof(
void*);
677 static constexpr
float _S_growth_factor = 1.5;
679 void* _M_current_buf =
nullptr;
681 size_t _M_next_bufsiz = _S_init_bufsize;
684 memory_resource*
const _M_upstream;
685 void*
const _M_orig_buf =
nullptr;
686 size_t const _M_orig_size = _M_next_bufsiz;
689 _Chunk* _M_head =
nullptr;
693 _GLIBCXX_END_NAMESPACE_VERSION
697 #endif // _GLIBCXX_MEMORY_RESOURCE