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// <memory_resource> -*- C++ -*- // Copyright (C) 2018-2024 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file include/memory_resource * This is a Standard C++ Library header. * * This header declares the @ref pmr (std::pmr) memory resources. * @ingroup pmr */ #ifndef _GLIBCXX_MEMORY_RESOURCE #define _GLIBCXX_MEMORY_RESOURCE 1 #pragma GCC system_header #include <bits/requires_hosted.h> // polymorphic allocation #define __glibcxx_want_polymorphic_allocator #define __glibcxx_want_memory_resource #include <bits/version.h> #if __cplusplus >= 201703L /** * @defgroup pmr Polymorphic memory resources * * @anchor pmr * @ingroup memory * @since C++17 * * Memory resources are classes that implement the `std::pmr::memory_resource` * interface for allocating and deallocating memory. Unlike traditional C++ * allocators, memory resources are not value types and are used via pointers * to the abstract base class. They are only responsible for allocating and * deallocating, not for construction and destruction of objects. As a result, * memory resources just allocate raw memory as type `void*` and are not * templates that allocate/deallocate and construct/destroy a specific type. * * The class template `std::pmr::polymorphic_allocator` is an allocator that * uses a memory resource for its allocations. */ #include <bits/memory_resource.h> #include <vector> // vector #include <shared_mutex> // shared_mutex #include <bits/align.h> // align #include <debug/assertions.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace pmr { #ifdef __cpp_lib_polymorphic_allocator // C++ >= 20 && HOSTED template<typename _Tp = std::byte> class polymorphic_allocator; #endif // Global memory resources /// A pmr::memory_resource that uses `new` to allocate memory /** * @ingroup pmr * @headerfile memory_resource * @since C++17 */ [[nodiscard, __gnu__::__returns_nonnull__, __gnu__::__const__]] memory_resource* new_delete_resource() noexcept; /// A pmr::memory_resource that always throws `bad_alloc` [[nodiscard, __gnu__::__returns_nonnull__, __gnu__::__const__]] memory_resource* null_memory_resource() noexcept; /// Replace the default memory resource pointer [[__gnu__::__returns_nonnull__]] memory_resource* set_default_resource(memory_resource* __r) noexcept; /// Get the current default memory resource pointer [[__gnu__::__returns_nonnull__]] memory_resource* get_default_resource() noexcept; // Pool resource classes struct pool_options; #if __cpp_lib_memory_resource >= 201603L // C++ >= 17 && hosted && gthread class synchronized_pool_resource; #endif class unsynchronized_pool_resource; class monotonic_buffer_resource; /// Parameters for tuning a pool resource's behaviour. /** * @ingroup pmr * @headerfile memory_resource * @since C++17 */ struct pool_options { /** @brief Upper limit on number of blocks in a chunk. * * A lower value prevents allocating huge chunks that could remain mostly * unused, but means pools will need to replenished more frequently. */ size_t max_blocks_per_chunk = 0; /* @brief Largest block size (in bytes) that should be served from pools. * * Larger allocations will be served directly by the upstream resource, * not from one of the pools managed by the pool resource. */ size_t largest_required_pool_block = 0; }; // Common implementation details for un-/synchronized pool resources. class __pool_resource { friend class synchronized_pool_resource; friend class unsynchronized_pool_resource; __pool_resource(const pool_options& __opts, memory_resource* __upstream); ~__pool_resource(); __pool_resource(const __pool_resource&) = delete; __pool_resource& operator=(const __pool_resource&) = delete; // Allocate a large unpooled block. void* allocate(size_t __bytes, size_t __alignment); // Deallocate a large unpooled block. void deallocate(void* __p, size_t __bytes, size_t __alignment); // Deallocate unpooled memory. void release() noexcept; memory_resource* resource() const noexcept { return _M_unpooled.get_allocator().resource(); } struct _Pool; _Pool* _M_alloc_pools(); const pool_options _M_opts; struct _BigBlock; // Collection of blocks too big for any pool, sorted by address. // This also stores the only copy of the upstream memory resource pointer. _GLIBCXX_STD_C::pmr::vector<_BigBlock> _M_unpooled; const int _M_npools; }; #if __cpp_lib_memory_resource >= 201603L // C++ >= 17 && hosted && gthread /// A thread-safe memory resource that manages pools of fixed-size blocks. /** * @ingroup pmr * @headerfile memory_resource * @since C++17 */ class synchronized_pool_resource : public memory_resource { public: synchronized_pool_resource(const pool_options& __opts, memory_resource* __upstream) __attribute__((__nonnull__)); synchronized_pool_resource() : synchronized_pool_resource(pool_options(), get_default_resource()) { } explicit synchronized_pool_resource(memory_resource* __upstream) __attribute__((__nonnull__)) : synchronized_pool_resource(pool_options(), __upstream) { } explicit synchronized_pool_resource(const pool_options& __opts) : synchronized_pool_resource(__opts, get_default_resource()) { } synchronized_pool_resource(const synchronized_pool_resource&) = delete; virtual ~synchronized_pool_resource(); synchronized_pool_resource& operator=(const synchronized_pool_resource&) = delete; void release(); memory_resource* upstream_resource() const noexcept __attribute__((__returns_nonnull__)) { return _M_impl.resource(); } pool_options options() const noexcept { return _M_impl._M_opts; } protected: void* do_allocate(size_t __bytes, size_t __alignment) override; void do_deallocate(void* __p, size_t __bytes, size_t __alignment) override; bool do_is_equal(const memory_resource& __other) const noexcept override { return this == &__other; } public: // Thread-specific pools (only public for access by implementation details) struct _TPools; private: _TPools* _M_alloc_tpools(lock_guard<shared_mutex>&); _TPools* _M_alloc_shared_tpools(lock_guard<shared_mutex>&); auto _M_thread_specific_pools() noexcept; __pool_resource _M_impl; __gthread_key_t _M_key; // Linked list of thread-specific pools. All threads share _M_tpools[0]. _TPools* _M_tpools = nullptr; mutable shared_mutex _M_mx; }; #endif // __cpp_lib_memory_resource >= 201603L /// A non-thread-safe memory resource that manages pools of fixed-size blocks. /** * @ingroup pmr * @headerfile memory_resource * @since C++17 */ class unsynchronized_pool_resource : public memory_resource { public: [[__gnu__::__nonnull__]] unsynchronized_pool_resource(const pool_options& __opts, memory_resource* __upstream); unsynchronized_pool_resource() : unsynchronized_pool_resource(pool_options(), get_default_resource()) { } [[__gnu__::__nonnull__]] explicit unsynchronized_pool_resource(memory_resource* __upstream) : unsynchronized_pool_resource(pool_options(), __upstream) { } explicit unsynchronized_pool_resource(const pool_options& __opts) : unsynchronized_pool_resource(__opts, get_default_resource()) { } unsynchronized_pool_resource(const unsynchronized_pool_resource&) = delete; virtual ~unsynchronized_pool_resource(); unsynchronized_pool_resource& operator=(const unsynchronized_pool_resource&) = delete; void release(); [[__gnu__::__returns_nonnull__]] memory_resource* upstream_resource() const noexcept { return _M_impl.resource(); } pool_options options() const noexcept { return _M_impl._M_opts; } protected: void* do_allocate(size_t __bytes, size_t __alignment) override; void do_deallocate(void* __p, size_t __bytes, size_t __alignment) override; bool do_is_equal(const memory_resource& __other) const noexcept override { return this == &__other; } private: using _Pool = __pool_resource::_Pool; auto _M_find_pool(size_t) noexcept; __pool_resource _M_impl; _Pool* _M_pools = nullptr; }; /// A memory resource that allocates from a fixed-size buffer. /** * The main feature of a `pmr::monotonic_buffer_resource` is that its * `do_deallocate` does nothing. This makes it very fast because there is no * need to manage a free list, and every allocation simply returns a new * block of memory, rather than searching for a suitably-sized free block. * Because deallocating is a no-op, the amount of memory used by the resource * only grows until `release()` (or the destructor) is called to return all * memory to upstream. * * A `monotonic_buffer_resource` can be initialized with a buffer that * will be used to satisfy all allocation requests, until the buffer is full. * After that a new buffer will be allocated from the upstream resource. * By using a stack buffer and `pmr::null_memory_resource()` as the upstream * you can get a memory resource that only uses the stack and never * dynamically allocates. * * @ingroup pmr * @headerfile memory_resource * @since C++17 */ class monotonic_buffer_resource : public memory_resource { public: explicit monotonic_buffer_resource(memory_resource* __upstream) noexcept __attribute__((__nonnull__)) : _M_upstream(__upstream) { _GLIBCXX_DEBUG_ASSERT(__upstream != nullptr); } monotonic_buffer_resource(size_t __initial_size, memory_resource* __upstream) noexcept __attribute__((__nonnull__)) : _M_next_bufsiz(__initial_size), _M_upstream(__upstream) { _GLIBCXX_DEBUG_ASSERT(__upstream != nullptr); _GLIBCXX_DEBUG_ASSERT(__initial_size > 0); } monotonic_buffer_resource(void* __buffer, size_t __buffer_size, memory_resource* __upstream) noexcept __attribute__((__nonnull__(4))) : _M_current_buf(__buffer), _M_avail(__buffer_size), _M_next_bufsiz(_S_next_bufsize(__buffer_size)), _M_upstream(__upstream), _M_orig_buf(__buffer), _M_orig_size(__buffer_size) { _GLIBCXX_DEBUG_ASSERT(__upstream != nullptr); _GLIBCXX_DEBUG_ASSERT(__buffer != nullptr || __buffer_size == 0); } monotonic_buffer_resource() noexcept : monotonic_buffer_resource(get_default_resource()) { } explicit monotonic_buffer_resource(size_t __initial_size) noexcept : monotonic_buffer_resource(__initial_size, get_default_resource()) { } monotonic_buffer_resource(void* __buffer, size_t __buffer_size) noexcept : monotonic_buffer_resource(__buffer, __buffer_size, get_default_resource()) { } monotonic_buffer_resource(const monotonic_buffer_resource&) = delete; virtual ~monotonic_buffer_resource(); // key function monotonic_buffer_resource& operator=(const monotonic_buffer_resource&) = delete; void release() noexcept { if (_M_head) _M_release_buffers(); // reset to initial state at contruction: if ((_M_current_buf = _M_orig_buf)) { _M_avail = _M_orig_size; _M_next_bufsiz = _S_next_bufsize(_M_orig_size); } else { _M_avail = 0; _M_next_bufsiz = _M_orig_size; } } memory_resource* upstream_resource() const noexcept __attribute__((__returns_nonnull__)) { return _M_upstream; } protected: void* do_allocate(size_t __bytes, size_t __alignment) override { if (__builtin_expect(__bytes == 0, false)) __bytes = 1; // Ensures we don't return the same pointer twice. void* __p = std::align(__alignment, __bytes, _M_current_buf, _M_avail); if (__builtin_expect(__p == nullptr, false)) { _M_new_buffer(__bytes, __alignment); __p = _M_current_buf; } _M_current_buf = (char*)_M_current_buf + __bytes; _M_avail -= __bytes; return __p; } void do_deallocate(void*, size_t, size_t) override { } bool do_is_equal(const memory_resource& __other) const noexcept override { return this == &__other; } private: // Update _M_current_buf and _M_avail to refer to a new buffer with // at least the specified size and alignment, allocated from upstream. void _M_new_buffer(size_t __bytes, size_t __alignment); // Deallocate all buffers obtained from upstream. void _M_release_buffers() noexcept; static size_t _S_next_bufsize(size_t __buffer_size) noexcept { if (__builtin_expect(__buffer_size == 0, false)) __buffer_size = 1; return __buffer_size * _S_growth_factor; } static constexpr size_t _S_init_bufsize = 128 * sizeof(void*); static constexpr float _S_growth_factor = 1.5; void* _M_current_buf = nullptr; size_t _M_avail = 0; size_t _M_next_bufsiz = _S_init_bufsize; // Initial values set at construction and reused by release(): memory_resource* const _M_upstream; void* const _M_orig_buf = nullptr; size_t const _M_orig_size = _M_next_bufsiz; class _Chunk; _Chunk* _M_head = nullptr; }; } // namespace pmr _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // C++17 #endif // _GLIBCXX_MEMORY_RESOURCE