1/*
2 * Copyright (C) 2010, 2016 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#pragma once
30
31#include "JSRunLoopTimer.h"
32#include <wtf/RefPtr.h>
33
34#if USE(CF)
35#include <CoreFoundation/CoreFoundation.h>
36#endif
37
38namespace JSC {
39
40class FullGCActivityCallback;
41class Heap;
42
43class JS_EXPORT_PRIVATE GCActivityCallback : public JSRunLoopTimer {
44public:
45 using Base = JSRunLoopTimer;
46 static RefPtr<FullGCActivityCallback> tryCreateFullTimer(Heap*);
47 static RefPtr<GCActivityCallback> tryCreateEdenTimer(Heap*);
48
49 GCActivityCallback(Heap*);
50
51 void doWork(VM&) override;
52
53 virtual void doCollection(VM&) = 0;
54
55 void didAllocate(Heap&, size_t);
56 void willCollect();
57 void cancel();
58 bool isEnabled() const { return m_enabled; }
59 void setEnabled(bool enabled) { m_enabled = enabled; }
60
61 static bool s_shouldCreateGCTimer;
62
63protected:
64 virtual Seconds lastGCLength(Heap&) = 0;
65 virtual double gcTimeSlice(size_t bytes) = 0;
66 virtual double deathRate(Heap&) = 0;
67
68 GCActivityCallback(VM* vm)
69 : Base(vm)
70 , m_enabled(true)
71 , m_delay(s_decade)
72 {
73 }
74
75 bool m_enabled;
76
77protected:
78 void scheduleTimer(Seconds);
79
80private:
81 Seconds m_delay;
82};
83
84} // namespace JSC
85