| /* |
| * Copyright (C) 2014 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 "Chunk.h" |
| #include "Deallocator.h" |
| #include "DebugHeap.h" |
| #include "Heap.h" |
| #include "Inline.h" |
| #include "Object.h" |
| #include "PerProcess.h" |
| #include <algorithm> |
| #include <cstdlib> |
| #include <sys/mman.h> |
| |
| using namespace std; |
| |
| 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::lock_guard<StaticMutex> lock(Heap::mutex()); |
| |
| processObjectLog(lock); |
| m_heap.deallocateLineCache(lock, lineCache(lock)); |
| } |
| |
| void Deallocator::processObjectLog(std::lock_guard<StaticMutex>& 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::lock_guard<StaticMutex> 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 |