/* * Copyright (C) 2011 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. * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 WTF_MetaAllocatorHandle_h #define WTF_MetaAllocatorHandle_h #include <wtf/Assertions.h> #include <wtf/RefCounted.h> #include <wtf/RefPtr.h> namespace WTF { class MetaAllocator; class MetaAllocatorHandle : public RefCounted<MetaAllocatorHandle> { private: MetaAllocatorHandle(MetaAllocator*, void* start, size_t sizeInBytes); MetaAllocatorHandle(void* start, size_t sizeInBytes) : m_allocator(0) , m_start(start) , m_sizeInBytes(sizeInBytes) { ASSERT(start); } public: ~MetaAllocatorHandle(); static PassRefPtr<MetaAllocatorHandle> createSelfManagedHandle(void* start, size_t sizeInBytes) { return adoptRef(new MetaAllocatorHandle(start, sizeInBytes)); } void* start() { return m_start; } void* end() { return reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(m_start) + m_sizeInBytes); } size_t sizeInBytes() { return m_sizeInBytes; } void shrink(size_t newSizeInBytes); bool isManaged() { return !!m_allocator; } MetaAllocator* allocator() { ASSERT(m_allocator); return m_allocator; } private: friend class MetaAllocator; MetaAllocator* m_allocator; void* m_start; size_t m_sizeInBytes; }; } #endif