diff -r 000000000000 -r 4f2f89ce4247 WebCore/bindings/v8/ScriptGCEvent.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/ScriptGCEvent.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,101 @@
+/*
+* Copyright (C) 2010 Google 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:
+*
+*     * Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+*     * 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.
+*     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+* OWNER OR 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.
+*/
+
+#include "config.h"
+
+#if ENABLE(INSPECTOR)
+
+#include "ScriptGCEvent.h"
+#include "ScriptGCEventListener.h"
+
+#include <wtf/CurrentTime.h>
+
+namespace WebCore {
+
+ScriptGCEvent::GCEventListeners ScriptGCEvent::s_eventListeners;
+double ScriptGCEvent::s_startTime = 0.0;
+size_t ScriptGCEvent::s_usedHeapSize = 0;
+
+void ScriptGCEvent::addEventListener(ScriptGCEventListener* eventListener)
+{
+    ASSERT(eventListener);
+    if (s_eventListeners.isEmpty()) {
+        v8::V8::AddGCPrologueCallback(ScriptGCEvent::gcPrologueCallback);
+        v8::V8::AddGCEpilogueCallback(ScriptGCEvent::gcEpilogueCallback);
+    }
+    s_eventListeners.append(eventListener);
+}
+
+void ScriptGCEvent::removeEventListener(ScriptGCEventListener* eventListener)
+{
+    ASSERT(eventListener);
+    ASSERT(!s_eventListeners.isEmpty());
+    size_t i = s_eventListeners.find(eventListener);
+    ASSERT(i != notFound);
+    s_eventListeners.remove(i);
+    if (s_eventListeners.isEmpty()) {
+        v8::V8::RemoveGCPrologueCallback(ScriptGCEvent::gcPrologueCallback);
+        v8::V8::RemoveGCEpilogueCallback(ScriptGCEvent::gcEpilogueCallback);
+    }
+}
+
+void ScriptGCEvent::getHeapSize(size_t& usedHeapSize, size_t& totalHeapSize)
+{
+    v8::HeapStatistics heapStatistics;
+    v8::V8::GetHeapStatistics(&heapStatistics);
+    usedHeapSize = heapStatistics.used_heap_size();
+    totalHeapSize = heapStatistics.total_heap_size();
+}
+
+size_t ScriptGCEvent::getUsedHeapSize()
+{
+    v8::HeapStatistics heapStatistics;
+    v8::V8::GetHeapStatistics(&heapStatistics);
+    return heapStatistics.used_heap_size();
+}
+
+void ScriptGCEvent::gcPrologueCallback(v8::GCType type, v8::GCCallbackFlags flags)
+{
+    s_startTime = WTF::currentTimeMS();
+    s_usedHeapSize = getUsedHeapSize();
+}
+
+void ScriptGCEvent::gcEpilogueCallback(v8::GCType type, v8::GCCallbackFlags flags)
+{
+    double endTime = WTF::currentTimeMS();
+    size_t collectedBytes = s_usedHeapSize - getUsedHeapSize();
+    GCEventListeners listeners(s_eventListeners);
+    for (GCEventListeners::iterator i = listeners.begin(); i != listeners.end(); ++i)
+        (*i)->didGC(s_startTime, endTime, collectedBytes);
+}
+    
+} // namespace WebCore
+
+#endif // ENABLE(INSPECTOR)