JavaScriptCore-7600.1.4.17.5.tar.gz

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

/*
 * Copyright (C) 2010 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. 
 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE 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
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 */

#ifndef GCActivityCallback_h
#define GCActivityCallback_h

#include "HeapTimer.h"
#include <wtf/OwnPtr.h>
#include <wtf/PassRefPtr.h>

#if USE(CF)
#include <CoreFoundation/CoreFoundation.h>
#endif

namespace JSC {

class Heap;

class JS_EXPORT_PRIVATE GCActivityCallback : public HeapTimer, public ThreadSafeRefCounted<GCActivityCallback> {
    WTF_MAKE_FAST_ALLOCATED;
public:
    static PassRefPtr<GCActivityCallback> createFullTimer(Heap*);
    static PassRefPtr<GCActivityCallback> createEdenTimer(Heap*);

    GCActivityCallback(Heap*);

    virtual void doWork() override;

    virtual void doCollection() = 0;

    virtual void didAllocate(size_t);
    virtual void willCollect();
    virtual void cancel();
    bool isEnabled() const { return m_enabled; }
    void setEnabled(bool enabled) { m_enabled = enabled; }

    static bool s_shouldCreateGCTimer;

protected:
    virtual double lastGCLength() = 0;
    virtual double gcTimeSlice(size_t bytes) = 0;
    virtual double deathRate() = 0;

#if USE(CF)
    GCActivityCallback(VM* vm, CFRunLoopRef runLoop)
        : HeapTimer(vm, runLoop)
        , m_enabled(true)
        , m_delay(s_decade)
    {
    }
#elif PLATFORM(EFL)
    static constexpr double s_hour = 3600;
    GCActivityCallback(VM* vm, bool flag)
        : HeapTimer(vm)
        , m_enabled(flag)
        , m_delay(s_hour)
    {
    }
#else
    GCActivityCallback(VM* vm)
        : HeapTimer(vm)
        , m_enabled(true)
    {
    }
#endif

    bool m_enabled;

#if USE(CF)
protected:
    GCActivityCallback(Heap*, CFRunLoopRef);
#endif
#if USE(CF) || PLATFORM(EFL)
protected:
    void cancelTimer();
    void scheduleTimer(double);

private:
    double m_delay;
#endif
};

} // namespace JSC

#endif