JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / heap / WriteBarrierBuffer.h

/*
 * Copyright (C) 2013, 2015 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. 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
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#ifndef WriteBarrierBuffer_h
#define WriteBarrierBuffer_h

#include <wtf/FastMalloc.h>

namespace JSC {

class Heap;
class JSCell;

class WriteBarrierBuffer {
public:
    WriteBarrierBuffer(unsigned capacity);
    ~WriteBarrierBuffer();

    void add(JSCell*);
    void flush(Heap&);
    void reset();

    unsigned* currentIndexAddress()
    {
        return &m_currentIndex;
    }

    unsigned capacity() const
    {
        return m_capacity;
    }

    JSCell** buffer()
    {
        return m_buffer;
    }

private:
    unsigned m_currentIndex;
    const unsigned m_capacity;
    JSCell** const m_buffer;
};

} // namespace JSC

#endif // WriteBarrierBuffer_h