/* * 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. * * 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. */ #ifndef CopiedBlock_h #define CopiedBlock_h #include "HeapBlock.h" #include "JSValue.h" #include "JSValueInlineMethods.h" namespace JSC { class CopiedSpace; class CopiedBlock : public HeapBlock { friend class CopiedSpace; friend class CopiedAllocator; public: CopiedBlock(PageAllocationAligned& allocation) : HeapBlock(allocation) , m_offset(payload()) , m_isPinned(false) { ASSERT(is8ByteAligned(static_cast<void*>(m_offset))); #if USE(JSVALUE64) char* offset = static_cast<char*>(m_offset); memset(static_cast<void*>(offset), 0, static_cast<size_t>((reinterpret_cast<char*>(this) + allocation.size()) - offset)); #else JSValue emptyValue; JSValue* limit = reinterpret_cast_ptr<JSValue*>(reinterpret_cast<char*>(this) + allocation.size()); for (JSValue* currentValue = reinterpret_cast<JSValue*>(m_offset); currentValue < limit; currentValue++) *currentValue = emptyValue; #endif } char* payload(); size_t size(); size_t capacity(); private: void* m_offset; uintptr_t m_isPinned; }; inline char* CopiedBlock::payload() { return reinterpret_cast<char*>(this) + ((sizeof(CopiedBlock) + 7) & ~7); } inline size_t CopiedBlock::size() { return static_cast<size_t>(static_cast<char*>(m_offset) - payload()); } inline size_t CopiedBlock::capacity() { return m_allocation.size(); } } // namespace JSC #endif