/* * Copyright (C) 2010 Apple Inc. All rights reserved. * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) * Copyright (C) 2010 University of Szeged * * 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. AND ITS CONTRIBUTORS ``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 ITS 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. */ #ifndef MappedMemoryPool_h #define MappedMemoryPool_h #include #include #include #include namespace WebKit { class MappedMemoryPool; struct MappedMemory { QString mappedFileName() const { ASSERT(file); ASSERT(mappedBytes); return fileName; } void markFree() { ASSERT(mappedBytes); dataPtr->isFree = true; } uchar* data() const { ASSERT(mappedBytes); return dataPtr->bytes; } private: friend class MappedMemoryPool; MappedMemory() : file(0) , mappedBytes(0) , dataSize(0) { } void markUsed() { dataPtr->isFree = false; } size_t mapSize() const { return dataSize + sizeof(Data); } bool isFree() const { return dataPtr->isFree; } struct Data { uint32_t isFree; // keep bytes aligned uchar bytes[]; }; QFile* file; QString fileName; union { uchar* mappedBytes; Data* dataPtr; }; size_t dataSize; }; class MappedMemoryPool : QObject { Q_OBJECT public: static MappedMemoryPool* instance(); MappedMemory* mapMemory(size_t size); MappedMemory* mapFile(QString fileName, size_t size); private: MappedMemoryPool() { } ~MappedMemoryPool(); static MappedMemoryPool* theInstance; Vector m_pool; }; } // namespace WebKit #endif // MappedMemoryPool_h