JavaScriptCore-7600.1.4.16.1.tar.gz

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

/*
 * Copyright (C) 2013 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
 * 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
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 */

#ifndef SuperRegion_h
#define SuperRegion_h

#include <wtf/MetaAllocator.h>
#include <wtf/PageBlock.h>
#include <wtf/PageReservation.h>

namespace JSC {

class VM;

class SuperRegion : public WTF::MetaAllocator {
public:
    SuperRegion();
    virtual ~SuperRegion();

protected:
    virtual void* allocateNewSpace(size_t&) override;
    virtual void notifyNeedPage(void*) override;
    virtual void notifyPageIsFree(void*) override;

private:
    static const uint64_t s_fixedHeapMemoryPoolSize;

    static void* getAlignedBase(PageReservation&);

    PageReservation m_reservation;
    void* m_reservationBase;
};

} // namespace JSC

#endif // SuperRegion_h