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// Copyright 2016 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_ZONE_ACCOUNTING_ALLOCATOR_H_ #define V8_ZONE_ACCOUNTING_ALLOCATOR_H_ #include <atomic> #include "src/base/macros.h" namespace v8 { namespace internal { class Segment; class Zone; class V8_EXPORT_PRIVATE AccountingAllocator { public: AccountingAllocator() = default; virtual ~AccountingAllocator(); // Allocates a new segment. Returns nullptr on failed allocation. virtual Segment* AllocateSegment(size_t bytes); // Return unneeded segments to either insert them into the pool or release // them if the pool is already full or memory pressure is high. virtual void ReturnSegment(Segment* memory); size_t GetCurrentMemoryUsage() const { return current_memory_usage_.load(std::memory_order_relaxed); } size_t GetMaxMemoryUsage() const { return max_memory_usage_.load(std::memory_order_relaxed); } virtual void ZoneCreation(const Zone* zone) {} virtual void ZoneDestruction(const Zone* zone) {} private: std::atomic<size_t> current_memory_usage_{0}; std::atomic<size_t> max_memory_usage_{0}; DISALLOW_COPY_AND_ASSIGN(AccountingAllocator); }; } // namespace internal } // namespace v8 #endif // V8_ZONE_ACCOUNTING_ALLOCATOR_H_