HeapCellType.h   [plain text]

/*
 * Copyright (C) 2017 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. 
 */

#pragma once

#include "MarkedBlock.h"

namespace JSC {

class HeapCellType {
    WTF_MAKE_NONCOPYABLE(HeapCellType);
    WTF_MAKE_FAST_ALLOCATED;
public:
    JS_EXPORT_PRIVATE HeapCellType(CellAttributes);
    JS_EXPORT_PRIVATE virtual ~HeapCellType();

    const CellAttributes& attributes() const { return m_attributes; }

    // The purpose of overriding this is to specialize the sweep for your destructors. This won't
    // be called for no-destructor blocks. This must call MarkedBlock::finishSweepKnowingSubspace.
    virtual void finishSweep(MarkedBlock::Handle&, FreeList*);

    // These get called for large objects.
    virtual void destroy(VM&, JSCell*);

private:
    CellAttributes m_attributes;
};

} // namespace JSC