/* * Copyright (C) 2014-2018 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "BAssert.h" #include "BInline.h" #include "Chunk.h" #include "Deallocator.h" #include "DebugHeap.h" #include "Heap.h" #include "Object.h" #include "PerProcess.h" #include <algorithm> #include <cstdlib> #include <sys/mman.h> namespace bmalloc { Deallocator::Deallocator(Heap& heap) : m_heap(heap) , m_debugHeap(heap.debugHeap()) { if (m_debugHeap) { // Fill the object log in order to disable the fast path. while (m_objectLog.size() != m_objectLog.capacity()) m_objectLog.push(nullptr); } } Deallocator::~Deallocator() { scavenge(); } void Deallocator::scavenge() { if (m_debugHeap) return; std::unique_lock<Mutex> lock(Heap::mutex()); processObjectLog(lock); m_heap.deallocateLineCache(lock, lineCache(lock)); } void Deallocator::processObjectLog(std::unique_lock<Mutex>& lock) { for (Object object : m_objectLog) m_heap.derefSmallLine(lock, object, lineCache(lock)); m_objectLog.clear(); } void Deallocator::deallocateSlowCase(void* object) { if (m_debugHeap) return m_debugHeap->free(object); if (!object) return; std::unique_lock<Mutex> lock(Heap::mutex()); if (m_heap.isLarge(lock, object)) { m_heap.deallocateLarge(lock, object); return; } if (m_objectLog.size() == m_objectLog.capacity()) processObjectLog(lock); m_objectLog.push(object); } } // namespace bmalloc