CopiedBlock.h 2.35 KB
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/*
 * 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. 
 */

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#ifndef CopiedBlock_h
#define CopiedBlock_h
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#include "HeapBlock.h"
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#include "JSValue.h"
#include "JSValueInlineMethods.h"
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namespace JSC {

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class CopiedSpace;
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class CopiedBlock : public HeapBlock {
    friend class CopiedSpace;
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    friend class CopiedAllocator;
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public:
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    CopiedBlock(PageAllocationAligned& allocation)
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        : HeapBlock(allocation)
        , m_offset(m_payload)
        , m_isPinned(false)
    {
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        ASSERT(is8ByteAligned(static_cast<void*>(m_payload)));
#if USE(JSVALUE64)
        memset(static_cast<void*>(m_payload), 0, static_cast<size_t>((reinterpret_cast<char*>(this) + allocation.size()) - m_payload));
#else
        JSValue emptyValue;
        JSValue* limit = reinterpret_cast<JSValue*>(reinterpret_cast<char*>(this) + allocation.size());
        for (JSValue* currentValue = reinterpret_cast<JSValue*>(m_payload); currentValue < limit; currentValue++)
            *currentValue = emptyValue;
#endif
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    }

private:
    void* m_offset;
    uintptr_t m_isPinned;
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    uintptr_t m_padding;
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    char m_payload[1];
};

} // namespace JSC

#endif