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      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 
     40 namespace WebCore {
     41 
     42 ScriptGCEvent::GCEventListeners ScriptGCEvent::s_eventListeners;
     43 double ScriptGCEvent::s_startTime = 0.0;
     44 size_t ScriptGCEvent::s_usedHeapSize = 0;
     45 
     46 void 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 
     56 void 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 
     69 void 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 
     78 size_t ScriptGCEvent::getUsedHeapSize()
     79 {
     80     v8::HeapStatistics heapStatistics;
     81     v8::V8::GetHeapStatistics(&heapStatistics);
     82     return heapStatistics.used_heap_size();
     83 }
     84 
     85 void ScriptGCEvent::gcPrologueCallback(v8::GCType type, v8::GCCallbackFlags flags)
     86 {
     87     s_startTime = WTF::currentTimeMS();
     88     s_usedHeapSize = getUsedHeapSize();
     89 }
     90 
     91 void 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