1/*
2* Copyright (C) 2010 Google 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 are
6* met:
7*
8*     * Redistributions of source code must retain the above copyright
9* notice, this list of conditions and the following disclaimer.
10*     * Redistributions in binary form must reproduce the above
11* copyright notice, this list of conditions and the following disclaimer
12* in the documentation and/or other materials provided with the
13* distribution.
14*     * Neither the name of Google Inc. nor the names of its
15* contributors may be used to endorse or promote products derived from
16* this software without specific prior written permission.
17*
18* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29*/
30
31#include "config.h"
32
33#if ENABLE(INSPECTOR)
34
35#include "ScriptGCEvent.h"
36#include "ScriptGCEventListener.h"
37
38#include <wtf/CurrentTime.h>
39
40namespace WebCore {
41
42ScriptGCEvent::GCEventListeners ScriptGCEvent::s_eventListeners;
43double ScriptGCEvent::s_startTime = 0.0;
44size_t ScriptGCEvent::s_usedHeapSize = 0;
45
46void ScriptGCEvent::addEventListener(ScriptGCEventListener* eventListener)
47{
48    ASSERT(eventListener);
49    if (s_eventListeners.isEmpty()) {
50        v8::V8::AddGCPrologueCallback(ScriptGCEvent::gcPrologueCallback);
51        v8::V8::AddGCEpilogueCallback(ScriptGCEvent::gcEpilogueCallback);
52    }
53    s_eventListeners.append(eventListener);
54}
55
56void ScriptGCEvent::removeEventListener(ScriptGCEventListener* eventListener)
57{
58    ASSERT(eventListener);
59    ASSERT(!s_eventListeners.isEmpty());
60    size_t i = s_eventListeners.find(eventListener);
61    ASSERT(i != notFound);
62    s_eventListeners.remove(i);
63    if (s_eventListeners.isEmpty()) {
64        v8::V8::RemoveGCPrologueCallback(ScriptGCEvent::gcPrologueCallback);
65        v8::V8::RemoveGCEpilogueCallback(ScriptGCEvent::gcEpilogueCallback);
66    }
67}
68
69void ScriptGCEvent::getHeapSize(size_t& usedHeapSize, size_t& totalHeapSize, size_t& heapSizeLimit)
70{
71    v8::HeapStatistics heapStatistics;
72    v8::V8::GetHeapStatistics(&heapStatistics);
73    usedHeapSize = heapStatistics.used_heap_size();
74    totalHeapSize = heapStatistics.total_heap_size();
75    heapSizeLimit = heapStatistics.heap_size_limit();
76}
77
78size_t ScriptGCEvent::getUsedHeapSize()
79{
80    v8::HeapStatistics heapStatistics;
81    v8::V8::GetHeapStatistics(&heapStatistics);
82    return heapStatistics.used_heap_size();
83}
84
85void ScriptGCEvent::gcPrologueCallback(v8::GCType type, v8::GCCallbackFlags flags)
86{
87    s_startTime = WTF::currentTimeMS();
88    s_usedHeapSize = getUsedHeapSize();
89}
90
91void ScriptGCEvent::gcEpilogueCallback(v8::GCType type, v8::GCCallbackFlags flags)
92{
93    double endTime = WTF::currentTimeMS();
94    size_t collectedBytes = s_usedHeapSize - getUsedHeapSize();
95    GCEventListeners listeners(s_eventListeners);
96    for (GCEventListeners::iterator i = listeners.begin(); i != listeners.end(); ++i)
97        (*i)->didGC(s_startTime, endTime, collectedBytes);
98}
99
100} // namespace WebCore
101
102#endif // ENABLE(INSPECTOR)
103