WebKit/Source/JavaScriptCore/heap/GCActivityCallback.h at main · WebKit/WebKit · GitHub

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* 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

* DISCLAIMED. IN NO EVENT SHALL APPLE 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 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 <JavaScriptCore/JSRunLoopTimer.h>

#include <JavaScriptCore/Synchronousness.h>

#include <wtf/RefPtr.h>

namespace JSC {

class FullGCActivityCallback;

class Heap;

class GCActivityCallback : public JSRunLoopTimer {

public:

using Base = JSRunLoopTimer;

JS_EXPORT_PRIVATE GCActivityCallback(Heap&, Synchronousness);

JS_EXPORT_PRIVATE ~GCActivityCallback();

JS_EXPORT_PRIVATE void doWork(VM&) override;

virtual void doCollection(VM&) = 0;

void didAllocate(Heap&, size_t);

void willCollect();

JS_EXPORT_PRIVATE void cancel();

bool isEnabled() const { return m_enabled; }

void setEnabled(bool enabled) { m_enabled = enabled; }

bool didGCRecently() const { return m_didGCRecently; }

void setDidGCRecently(bool didGCRecently) { m_didGCRecently = didGCRecently; }

static bool s_shouldCreateGCTimer;

protected:

virtual Seconds lastGCLength(Heap&) = 0;

virtual double gcTimeSlice(size_t bytes) = 0;

virtual double deathRate(Heap&) = 0;

JS_EXPORT_PRIVATE void scheduleTimer(Seconds);

GCActivityCallback(VM&, Synchronousness);

static double deathRate(size_t sizeBefore, size_t sizeAfter);

Synchronousness m_synchronousness { Synchronousness::Async };

bool m_enabled { true };

bool m_didGCRecently { false };

Seconds m_delay { s_decade };

};

} // namespace JSC

WebKit/Source/JavaScriptCore/heap/GCActivityCallback.h at main · WebKit/WebKit · GitHub

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