src/third_party/WebKit/Source/bindings/v8/ScriptGCEvent.cpp

   1 /*
   2 * Copyright (C) 2010 Google Inc. All rights reserved.
   3 *
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   6 * met:
   7 *
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   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.
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  15 * contributors may be used to endorse or promote products derived from
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  22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  29 */
  30
  31 #include "config.h"
  32
  33
  34 #include "bindings/v8/ScriptGCEvent.h"
  35 #include "bindings/v8/V8Binding.h"
  36 #include "core/inspector/ScriptGCEventListener.h"
  37
  38 #include "wtf/CurrentTime.h"
  39
  40 namespace WebCore {
  41
  42 static GCEventData* isolateGCEventData()
  43 {
  44     V8PerIsolateData* isolateData = V8PerIsolateData::from(v8::Isolate::GetCurrent());
  45     ASSERT(isolateData);
  46     return isolateData->gcEventData();
  47 }
  48
  49 void ScriptGCEvent::addEventListener(ScriptGCEventListener* eventListener)
  50 {
  51     GCEventData::GCEventListeners& listeners = isolateGCEventData()->listeners();
  52     if (listeners.isEmpty()) {
  53         v8::V8::AddGCPrologueCallback(ScriptGCEvent::gcPrologueCallback);
  54         v8::V8::AddGCEpilogueCallback(ScriptGCEvent::gcEpilogueCallback);
  55     }
  56     listeners.append(eventListener);
  57 }
  58
  59 void ScriptGCEvent::removeEventListener(ScriptGCEventListener* eventListener)
  60 {
  61     ASSERT(eventListener);
  62     GCEventData::GCEventListeners& listeners = isolateGCEventData()->listeners();
  63     ASSERT(!listeners.isEmpty());
  64     size_t i = listeners.find(eventListener);
  65     ASSERT(i != kNotFound);
  66     listeners.remove(i);
  67     if (listeners.isEmpty()) {
  68         v8::V8::RemoveGCPrologueCallback(ScriptGCEvent::gcPrologueCallback);
  69         v8::V8::RemoveGCEpilogueCallback(ScriptGCEvent::gcEpilogueCallback);
  70     }
  71 }
  72
  73 void ScriptGCEvent::getHeapSize(HeapInfo& info)
  74 {
  75     v8::HeapStatistics heapStatistics;
  76     v8::Isolate::GetCurrent()->GetHeapStatistics(&heapStatistics);
  77     info.usedJSHeapSize = heapStatistics.used_heap_size();
  78     info.totalJSHeapSize = heapStatistics.total_physical_size();
  79     info.jsHeapSizeLimit = heapStatistics.heap_size_limit();
  80 }
  81
  82 size_t ScriptGCEvent::getUsedHeapSize()
  83 {
  84     v8::HeapStatistics heapStatistics;
  85     v8::Isolate::GetCurrent()->GetHeapStatistics(&heapStatistics);
  86     return heapStatistics.used_heap_size();
  87 }
  88
  89 void ScriptGCEvent::gcPrologueCallback(v8::GCType type, v8::GCCallbackFlags flags)
  90 {
  91     GCEventData* gcEventData = isolateGCEventData();
  92     gcEventData->setStartTime(WTF::monotonicallyIncreasingTime());
  93     gcEventData->setUsedHeapSize(getUsedHeapSize());
  94 }
  95
  96 void ScriptGCEvent::gcEpilogueCallback(v8::GCType type, v8::GCCallbackFlags flags)
  97 {
  98     GCEventData* gcEventData = isolateGCEventData();
  99     if (!gcEventData->usedHeapSize())
 100         return;
 101     double endTime = WTF::monotonicallyIncreasingTime();
 102     size_t usedHeapSize = getUsedHeapSize();
 103     size_t collectedBytes = usedHeapSize > gcEventData->usedHeapSize() ? 0 : gcEventData->usedHeapSize() - usedHeapSize;
 104     GCEventData::GCEventListeners& listeners = gcEventData->listeners();
 105     for (GCEventData::GCEventListeners::iterator i = listeners.begin(); i != listeners.end(); ++i)
 106         (*i)->didGC(gcEventData->startTime(), endTime, collectedBytes);
 107     gcEventData->clear();
 108 }
 109
 110 } // namespace WebCore
 111