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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 
     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::current();
     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 != notFound);
     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 
    112