Upgrade to 2022-era LLVM LIBCXX

third_party/libcxx/__memory_resource/memory_resource.h

@@ -0,0 +1,75 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_RESOURCE_MEMORY_RESOURCE_H
+#define _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H
+
+#include <__config>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 17
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace pmr {
+
+// [mem.res.class]
+
+class _LIBCPP_TYPE_VIS memory_resource {
+  static const size_t __max_align = alignof(max_align_t);
+
+public:
+  virtual ~memory_resource();
+
+  _LIBCPP_NODISCARD_AFTER_CXX17
+  [[using __gnu__: __returns_nonnull__, __alloc_size__(2), __alloc_align__(3)]] _LIBCPP_HIDE_FROM_ABI void*
+  allocate(size_t __bytes, size_t __align = __max_align) {
+    return do_allocate(__bytes, __align);
+  }
+
+  [[__gnu__::__nonnull__]] _LIBCPP_HIDE_FROM_ABI void
+  deallocate(void* __p, size_t __bytes, size_t __align = __max_align) {
+    do_deallocate(__p, __bytes, __align);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI bool is_equal(const memory_resource& __other) const noexcept { return do_is_equal(__other); }
+
+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;
+};
+
+// [mem.res.eq]
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator==(const memory_resource& __lhs, const memory_resource& __rhs) noexcept {
+  return &__lhs == &__rhs || __lhs.is_equal(__rhs);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const memory_resource& __lhs, const memory_resource& __rhs) noexcept {
+  return !(__lhs == __rhs);
+}
+
+// [mem.res.global]
+
+[[__gnu__::__returns_nonnull__]] _LIBCPP_FUNC_VIS memory_resource* get_default_resource() noexcept;
+[[__gnu__::__returns_nonnull__]] _LIBCPP_FUNC_VIS memory_resource* set_default_resource(memory_resource*) noexcept;
+[[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_FUNC_VIS memory_resource* new_delete_resource() noexcept;
+[[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_FUNC_VIS memory_resource* null_memory_resource() noexcept;
+
+} // namespace pmr
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 17
+
+#endif // _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H

third_party/libcxx/__memory_resource/monotonic_buffer_resource.h

@@ -0,0 +1,122 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_RESOURCE_MONOTONIC_BUFFER_RESOURCE_H
+#define _LIBCPP___MEMORY_RESOURCE_MONOTONIC_BUFFER_RESOURCE_H
+
+#include <__config>
+#include <__memory/addressof.h>
+#include <__memory_resource/memory_resource.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 17
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace pmr {
+
+// [mem.res.monotonic.buffer]
+
+class _LIBCPP_TYPE_VIS monotonic_buffer_resource : public memory_resource {
+  static const size_t __default_buffer_capacity  = 1024;
+  static const size_t __default_buffer_alignment = 16;
+
+  struct __chunk_footer {
+    __chunk_footer* __next_;
+    char* __start_;
+    char* __cur_;
+    size_t __align_;
+    _LIBCPP_HIDE_FROM_ABI size_t __allocation_size() {
+      return (reinterpret_cast<char*>(this) - __start_) + sizeof(*this);
+    }
+    void* __try_allocate_from_chunk(size_t, size_t);
+  };
+
+  struct __initial_descriptor {
+    char* __start_;
+    char* __cur_;
+    union {
+      char* __end_;
+      size_t __size_;
+    };
+    void* __try_allocate_from_chunk(size_t, size_t);
+  };
+
+public:
+  _LIBCPP_HIDE_FROM_ABI monotonic_buffer_resource()
+      : monotonic_buffer_resource(nullptr, __default_buffer_capacity, get_default_resource()) {}
+
+  _LIBCPP_HIDE_FROM_ABI explicit monotonic_buffer_resource(size_t __initial_size)
+      : monotonic_buffer_resource(nullptr, __initial_size, get_default_resource()) {}
+
+  _LIBCPP_HIDE_FROM_ABI monotonic_buffer_resource(void* __buffer, size_t __buffer_size)
+      : monotonic_buffer_resource(__buffer, __buffer_size, get_default_resource()) {}
+
+  _LIBCPP_HIDE_FROM_ABI explicit monotonic_buffer_resource(memory_resource* __upstream)
+      : monotonic_buffer_resource(nullptr, __default_buffer_capacity, __upstream) {}
+
+  _LIBCPP_HIDE_FROM_ABI monotonic_buffer_resource(size_t __initial_size, memory_resource* __upstream)
+      : monotonic_buffer_resource(nullptr, __initial_size, __upstream) {}
+
+  _LIBCPP_HIDE_FROM_ABI monotonic_buffer_resource(void* __buffer, size_t __buffer_size, memory_resource* __upstream)
+      : __res_(__upstream) {
+    __initial_.__start_ = static_cast<char*>(__buffer);
+    if (__buffer != nullptr) {
+      __initial_.__cur_ = static_cast<char*>(__buffer) + __buffer_size;
+      __initial_.__end_ = static_cast<char*>(__buffer) + __buffer_size;
+    } else {
+      __initial_.__cur_  = nullptr;
+      __initial_.__size_ = __buffer_size;
+    }
+    __chunks_ = nullptr;
+  }
+
+  monotonic_buffer_resource(const monotonic_buffer_resource&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~monotonic_buffer_resource() override { release(); }
+
+  monotonic_buffer_resource& operator=(const monotonic_buffer_resource&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI void release() {
+    if (__initial_.__start_ != nullptr)
+      __initial_.__cur_ = __initial_.__end_;
+    while (__chunks_ != nullptr) {
+      __chunk_footer* __next = __chunks_->__next_;
+      __res_->deallocate(__chunks_->__start_, __chunks_->__allocation_size(), __chunks_->__align_);
+      __chunks_ = __next;
+    }
+  }
+
+  _LIBCPP_HIDE_FROM_ABI memory_resource* upstream_resource() const { return __res_; }
+
+protected:
+  void* do_allocate(size_t __bytes, size_t __alignment) override; // key function
+
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void do_deallocate(void*, size_t, size_t) override {}
+
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL bool do_is_equal(const memory_resource& __other) const _NOEXCEPT override {
+    return this == std::addressof(__other);
+  }
+
+private:
+  __initial_descriptor __initial_;
+  __chunk_footer* __chunks_;
+  memory_resource* __res_;
+};
+
+} // namespace pmr
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 17
+
+#endif // _LIBCPP___MEMORY_RESOURCE_MONOTONIC_BUFFER_RESOURCE_H

third_party/libcxx/__memory_resource/polymorphic_allocator.h

@@ -0,0 +1,224 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_RESOURCE_POLYMORPHIC_ALLOCATOR_H
+#define _LIBCPP___MEMORY_RESOURCE_POLYMORPHIC_ALLOCATOR_H
+
+#include <__assert>
+#include <__config>
+#include <__memory_resource/memory_resource.h>
+#include <__utility/exception_guard.h>
+#include <cstddef>
+#include <limits>
+#include <new>
+#include <stdexcept>
+#include <tuple>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+#if _LIBCPP_STD_VER >= 17
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace pmr {
+
+// [mem.poly.allocator.class]
+
+template <class _ValueType
+#  if _LIBCPP_STD_VER >= 20
+          = byte
+#  endif
+          >
+class _LIBCPP_TEMPLATE_VIS polymorphic_allocator {
+
+public:
+  using value_type = _ValueType;
+
+  // [mem.poly.allocator.ctor]
+
+  _LIBCPP_HIDE_FROM_ABI polymorphic_allocator() noexcept : __res_(std::pmr::get_default_resource()) {}
+
+  _LIBCPP_HIDE_FROM_ABI polymorphic_allocator(memory_resource* __r) noexcept : __res_(__r) {}
+
+  _LIBCPP_HIDE_FROM_ABI polymorphic_allocator(const polymorphic_allocator&) = default;
+
+  template <class _Tp>
+  _LIBCPP_HIDE_FROM_ABI polymorphic_allocator(const polymorphic_allocator<_Tp>& __other) noexcept
+      : __res_(__other.resource()) {}
+
+  polymorphic_allocator& operator=(const polymorphic_allocator&) = delete;
+
+  // [mem.poly.allocator.mem]
+
+  _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_HIDE_FROM_ABI _ValueType* allocate(size_t __n) {
+    if (__n > __max_size()) {
+      __throw_bad_array_new_length();
+    }
+    return static_cast<_ValueType*>(__res_->allocate(__n * sizeof(_ValueType), alignof(_ValueType)));
+  }
+
+  _LIBCPP_HIDE_FROM_ABI void deallocate(_ValueType* __p, size_t __n) {
+    _LIBCPP_ASSERT(__n <= __max_size(), "deallocate called for size which exceeds max_size()");
+    __res_->deallocate(__p, __n * sizeof(_ValueType), alignof(_ValueType));
+  }
+
+#  if _LIBCPP_STD_VER >= 20
+
+  [[nodiscard]] [[using __gnu__: __alloc_size__(2), __alloc_align__(3)]] _LIBCPP_HIDE_FROM_ABI void*
+  allocate_bytes(size_t __nbytes, size_t __alignment = alignof(max_align_t)) {
+    return __res_->allocate(__nbytes, __alignment);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI void deallocate_bytes(void* __ptr, size_t __nbytes, size_t __alignment = alignof(max_align_t)) {
+    __res_->deallocate(__ptr, __nbytes, __alignment);
+  }
+
+  template <class _Type>
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI _Type* allocate_object(size_t __n = 1) {
+    if (numeric_limits<size_t>::max() / sizeof(_Type) < __n)
+      std::__throw_bad_array_new_length();
+    return static_cast<_Type*>(allocate_bytes(__n * sizeof(_Type), alignof(_Type)));
+  }
+
+  template <class _Type>
+  _LIBCPP_HIDE_FROM_ABI void deallocate_object(_Type* __ptr, size_t __n = 1) {
+    deallocate_bytes(__ptr, __n * sizeof(_Type), alignof(_Type));
+  }
+
+  template <class _Type, class... _CtorArgs>
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI _Type* new_object(_CtorArgs&&... __ctor_args) {
+    _Type* __ptr = allocate_object<_Type>();
+    auto __guard = std::__make_exception_guard([&] { deallocate_object(__ptr); });
+    construct(__ptr, std::forward<_CtorArgs>(__ctor_args)...);
+    __guard.__complete();
+    return __ptr;
+  }
+
+  template <class _Type>
+  _LIBCPP_HIDE_FROM_ABI void delete_object(_Type* __ptr) {
+    destroy(__ptr);
+    deallocate_object(__ptr);
+  }
+
+#  endif // _LIBCPP_STD_VER >= 20
+
+  template <class _Tp, class... _Ts>
+  _LIBCPP_HIDE_FROM_ABI void construct(_Tp* __p, _Ts&&... __args) {
+    std::__user_alloc_construct_impl(
+        typename __uses_alloc_ctor<_Tp, polymorphic_allocator&, _Ts...>::type(),
+        __p,
+        *this,
+        std::forward<_Ts>(__args)...);
+  }
+
+  template <class _T1, class _T2, class... _Args1, class... _Args2>
+  _LIBCPP_HIDE_FROM_ABI 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 __uses_alloc_ctor< _T1, polymorphic_allocator&, _Args1... >::type(),
+                          std::move(__x),
+                          typename __make_tuple_indices<sizeof...(_Args1)>::type{}),
+        __transform_tuple(typename __uses_alloc_ctor< _T2, polymorphic_allocator&, _Args2... >::type(),
+                          std::move(__y),
+                          typename __make_tuple_indices<sizeof...(_Args2)>::type{}));
+  }
+
+  template <class _T1, class _T2>
+  _LIBCPP_HIDE_FROM_ABI void construct(pair<_T1, _T2>* __p) {
+    construct(__p, piecewise_construct, tuple<>(), tuple<>());
+  }
+
+  template <class _T1, class _T2, class _Up, class _Vp>
+  _LIBCPP_HIDE_FROM_ABI void construct(pair<_T1, _T2>* __p, _Up&& __u, _Vp&& __v) {
+    construct(__p,
+              piecewise_construct,
+              std::forward_as_tuple(std::forward<_Up>(__u)),
+              std::forward_as_tuple(std::forward<_Vp>(__v)));
+  }
+
+  template <class _T1, class _T2, class _U1, class _U2>
+  _LIBCPP_HIDE_FROM_ABI void construct(pair<_T1, _T2>* __p, const pair<_U1, _U2>& __pr) {
+    construct(__p, piecewise_construct, std::forward_as_tuple(__pr.first), std::forward_as_tuple(__pr.second));
+  }
+
+  template <class _T1, class _T2, class _U1, class _U2>
+  _LIBCPP_HIDE_FROM_ABI void construct(pair<_T1, _T2>* __p, pair<_U1, _U2>&& __pr) {
+    construct(__p,
+              piecewise_construct,
+              std::forward_as_tuple(std::forward<_U1>(__pr.first)),
+              std::forward_as_tuple(std::forward<_U2>(__pr.second)));
+  }
+
+  template <class _Tp>
+  _LIBCPP_HIDE_FROM_ABI void destroy(_Tp* __p) {
+    __p->~_Tp();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI polymorphic_allocator select_on_container_copy_construction() const noexcept {
+    return polymorphic_allocator();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI memory_resource* resource() const noexcept { return __res_; }
+
+private:
+  template <class... _Args, size_t... _Is>
+  _LIBCPP_HIDE_FROM_ABI tuple<_Args&&...>
+  __transform_tuple(integral_constant<int, 0>, tuple<_Args...>&& __t, __tuple_indices<_Is...>) {
+    return std::forward_as_tuple(std::get<_Is>(std::move(__t))...);
+  }
+
+  template <class... _Args, size_t... _Is>
+  _LIBCPP_HIDE_FROM_ABI tuple<allocator_arg_t const&, polymorphic_allocator&, _Args&&...>
+  __transform_tuple(integral_constant<int, 1>, tuple<_Args...>&& __t, __tuple_indices<_Is...>) {
+    using _Tup = tuple<allocator_arg_t const&, polymorphic_allocator&, _Args&&...>;
+    return _Tup(allocator_arg, *this, std::get<_Is>(std::move(__t))...);
+  }
+
+  template <class... _Args, size_t... _Is>
+  _LIBCPP_HIDE_FROM_ABI tuple<_Args&&..., polymorphic_allocator&>
+  __transform_tuple(integral_constant<int, 2>, tuple<_Args...>&& __t, __tuple_indices<_Is...>) {
+    using _Tup = tuple<_Args&&..., polymorphic_allocator&>;
+    return _Tup(std::get<_Is>(std::move(__t))..., *this);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI size_t __max_size() const noexcept {
+    return numeric_limits<size_t>::max() / sizeof(value_type);
+  }
+
+  memory_resource* __res_;
+};
+
+// [mem.poly.allocator.eq]
+
+template <class _Tp, class _Up>
+inline _LIBCPP_HIDE_FROM_ABI bool
+operator==(const polymorphic_allocator<_Tp>& __lhs, const polymorphic_allocator<_Up>& __rhs) noexcept {
+  return *__lhs.resource() == *__rhs.resource();
+}
+
+template <class _Tp, class _Up>
+inline _LIBCPP_HIDE_FROM_ABI bool
+operator!=(const polymorphic_allocator<_Tp>& __lhs, const polymorphic_allocator<_Up>& __rhs) noexcept {
+  return !(__lhs == __rhs);
+}
+
+} // namespace pmr
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 17
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___MEMORY_RESOURCE_POLYMORPHIC_ALLOCATOR_H

third_party/libcxx/__memory_resource/pool_options.h

@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_RESOURCE_POOL_OPTIONS_H
+#define _LIBCPP___MEMORY_RESOURCE_POOL_OPTIONS_H
+
+#include <__config>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 17
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace pmr {
+
+// [mem.res.pool.options]
+
+struct _LIBCPP_TYPE_VIS pool_options {
+  size_t max_blocks_per_chunk        = 0;
+  size_t largest_required_pool_block = 0;
+};
+
+} // namespace pmr
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 17
+
+#endif // _LIBCPP___MEMORY_RESOURCE_POOL_OPTIONS_H

third_party/libcxx/__memory_resource/synchronized_pool_resource.h

@@ -0,0 +1,94 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H
+#define _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H
+
+#include <__config>
+#include <__memory_resource/memory_resource.h>
+#include <__memory_resource/pool_options.h>
+#include <__memory_resource/unsynchronized_pool_resource.h>
+#include <cstddef>
+#if !defined(_LIBCPP_HAS_NO_THREADS)
+#  include <mutex>
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 17
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace pmr {
+
+// [mem.res.pool.overview]
+
+class _LIBCPP_TYPE_VIS synchronized_pool_resource : public memory_resource {
+public:
+  _LIBCPP_HIDE_FROM_ABI synchronized_pool_resource(const pool_options& __opts, memory_resource* __upstream)
+      : __unsync_(__opts, __upstream) {}
+
+  _LIBCPP_HIDE_FROM_ABI synchronized_pool_resource()
+      : synchronized_pool_resource(pool_options(), get_default_resource()) {}
+
+  _LIBCPP_HIDE_FROM_ABI explicit synchronized_pool_resource(memory_resource* __upstream)
+      : synchronized_pool_resource(pool_options(), __upstream) {}
+
+  _LIBCPP_HIDE_FROM_ABI explicit synchronized_pool_resource(const pool_options& __opts)
+      : synchronized_pool_resource(__opts, get_default_resource()) {}
+
+  synchronized_pool_resource(const synchronized_pool_resource&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~synchronized_pool_resource() override = default;
+
+  synchronized_pool_resource& operator=(const synchronized_pool_resource&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI void release() {
+#  if !defined(_LIBCPP_HAS_NO_THREADS)
+    unique_lock<mutex> __lk(__mut_);
+#  endif
+    __unsync_.release();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI memory_resource* upstream_resource() const { return __unsync_.upstream_resource(); }
+
+  _LIBCPP_HIDE_FROM_ABI pool_options options() const { return __unsync_.options(); }
+
+protected:
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void* do_allocate(size_t __bytes, size_t __align) override {
+#  if !defined(_LIBCPP_HAS_NO_THREADS)
+    unique_lock<mutex> __lk(__mut_);
+#  endif
+    return __unsync_.allocate(__bytes, __align);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void do_deallocate(void* __p, size_t __bytes, size_t __align) override {
+#  if !defined(_LIBCPP_HAS_NO_THREADS)
+    unique_lock<mutex> __lk(__mut_);
+#  endif
+    return __unsync_.deallocate(__p, __bytes, __align);
+  }
+
+  bool do_is_equal(const memory_resource& __other) const noexcept override; // key function
+
+private:
+#  if !defined(_LIBCPP_HAS_NO_THREADS)
+  mutex __mut_;
+#  endif
+  unsynchronized_pool_resource __unsync_;
+};
+
+} // namespace pmr
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 17
+
+#endif // _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H

third_party/libcxx/__memory_resource/unsynchronized_pool_resource.h

@@ -0,0 +1,106 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_RESOURCE_UNSYNCHRONIZED_POOL_RESOURCE_H
+#define _LIBCPP___MEMORY_RESOURCE_UNSYNCHRONIZED_POOL_RESOURCE_H
+
+#include <__config>
+#include <__memory_resource/memory_resource.h>
+#include <__memory_resource/pool_options.h>
+#include <cstddef>
+#include <cstdint>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 17
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace pmr {
+
+// [mem.res.pool.overview]
+
+class _LIBCPP_TYPE_VIS unsynchronized_pool_resource : public memory_resource {
+  class __fixed_pool;
+
+  class __adhoc_pool {
+    struct __chunk_footer;
+    __chunk_footer* __first_;
+
+  public:
+    _LIBCPP_HIDE_FROM_ABI explicit __adhoc_pool() : __first_(nullptr) {}
+
+    void __release_ptr(memory_resource* __upstream);
+    void* __do_allocate(memory_resource* __upstream, size_t __bytes, size_t __align);
+    void __do_deallocate(memory_resource* __upstream, void* __p, size_t __bytes, size_t __align);
+  };
+
+  static const size_t __min_blocks_per_chunk = 16;
+  static const size_t __min_bytes_per_chunk  = 1024;
+  static const size_t __max_blocks_per_chunk = (size_t(1) << 20);
+  static const size_t __max_bytes_per_chunk  = (size_t(1) << 30);
+
+  static const int __log2_smallest_block_size      = 3;
+  static const size_t __smallest_block_size        = 8;
+  static const size_t __default_largest_block_size = (size_t(1) << 20);
+  static const size_t __max_largest_block_size     = (size_t(1) << 30);
+
+  size_t __pool_block_size(int __i) const;
+  int __log2_pool_block_size(int __i) const;
+  int __pool_index(size_t __bytes, size_t __align) const;
+
+public:
+  unsynchronized_pool_resource(const pool_options& __opts, memory_resource* __upstream);
+
+  _LIBCPP_HIDE_FROM_ABI unsynchronized_pool_resource()
+      : unsynchronized_pool_resource(pool_options(), get_default_resource()) {}
+
+  _LIBCPP_HIDE_FROM_ABI explicit unsynchronized_pool_resource(memory_resource* __upstream)
+      : unsynchronized_pool_resource(pool_options(), __upstream) {}
+
+  _LIBCPP_HIDE_FROM_ABI explicit unsynchronized_pool_resource(const pool_options& __opts)
+      : unsynchronized_pool_resource(__opts, get_default_resource()) {}
+
+  unsynchronized_pool_resource(const unsynchronized_pool_resource&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~unsynchronized_pool_resource() override { release(); }
+
+  unsynchronized_pool_resource& operator=(const unsynchronized_pool_resource&) = delete;
+
+  void release();
+
+  _LIBCPP_HIDE_FROM_ABI memory_resource* upstream_resource() const { return __res_; }
+
+  [[__gnu__::__pure__]] pool_options options() const;
+
+protected:
+  void* do_allocate(size_t __bytes, size_t __align) override; // key function
+
+  void do_deallocate(void* __p, size_t __bytes, size_t __align) override;
+
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL bool do_is_equal(const memory_resource& __other) const _NOEXCEPT override {
+    return &__other == this;
+  }
+
+private:
+  memory_resource* __res_;
+  __adhoc_pool __adhoc_pool_;
+  __fixed_pool* __fixed_pools_;
+  int __num_fixed_pools_;
+  uint32_t __options_max_blocks_per_chunk_;
+};
+
+} // namespace pmr
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 17
+
+#endif // _LIBCPP___MEMORY_RESOURCE_UNSYNCHRONIZED_POOL_RESOURCE_H