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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. #include "src/zone/accounting-allocator.h" #include "src/base/logging.h" #include "src/utils/allocation.h" #include "src/zone/zone-segment.h" namespace v8 { namespace internal { AccountingAllocator::~AccountingAllocator() = default; Segment* AccountingAllocator::AllocateSegment(size_t bytes) { void* memory = AllocWithRetry(bytes); if (memory == nullptr) return nullptr; size_t current = current_memory_usage_.fetch_add(bytes, std::memory_order_relaxed) + bytes; size_t max = max_memory_usage_.load(std::memory_order_relaxed); while (current > max && !max_memory_usage_.compare_exchange_weak( max, current, std::memory_order_relaxed)) { // {max} was updated by {compare_exchange_weak}; retry. } DCHECK_LE(sizeof(Segment), bytes); return new (memory) Segment(bytes); } void AccountingAllocator::ReturnSegment(Segment* segment) { segment->ZapContents(); current_memory_usage_.fetch_sub(segment->total_size(), std::memory_order_relaxed); segment->ZapHeader(); free(segment); } } // namespace internal } // namespace v8