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

   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 #include "bindings/core/v8/ScriptGCEvent.h"
  33
  34 #include "bindings/core/v8/V8Binding.h"
  35 #include "core/inspector/ScriptGCEventListener.h"
  36
  37 #include "wtf/CurrentTime.h"
  38
  39 namespace blink {
  40
  41 static GCEventData* isolateGCEventData()
  42 {
  43     V8PerIsolateData* isolateData = V8PerIsolateData::from(v8::Isolate::GetCurrent());
  44     ASSERT(isolateData);
  45     return isolateData->gcEventData();
  46 }
  47
  48 void ScriptGCEvent::addEventListener(ScriptGCEventListener* eventListener)
  49 {
  50     GCEventData::GCEventListeners& listeners = isolateGCEventData()->listeners();
  51     if (listeners.isEmpty()) {
  52         v8::V8::AddGCPrologueCallback(ScriptGCEvent::gcPrologueCallback);
  53         v8::V8::AddGCEpilogueCallback(ScriptGCEvent::gcEpilogueCallback);
  54     }
  55     listeners.append(eventListener);
  56 }
  57
  58 void ScriptGCEvent::removeEventListener(ScriptGCEventListener* eventListener)
  59 {
  60     ASSERT(eventListener);
  61     GCEventData::GCEventListeners& listeners = isolateGCEventData()->listeners();
  62     ASSERT(!listeners.isEmpty());
  63     size_t i = listeners.find(eventListener);
  64     ASSERT(i != kNotFound);
  65     listeners.remove(i);
  66     if (listeners.isEmpty()) {
  67         v8::V8::RemoveGCPrologueCallback(ScriptGCEvent::gcPrologueCallback);
  68         v8::V8::RemoveGCEpilogueCallback(ScriptGCEvent::gcEpilogueCallback);
  69     }
  70 }
  71
  72 void ScriptGCEvent::getHeapSize(HeapInfo& info)
  73 {
  74     v8::HeapStatistics heapStatistics;
  75     v8::Isolate::GetCurrent()->GetHeapStatistics(&heapStatistics);
  76     info.usedJSHeapSize = heapStatistics.used_heap_size();
  77     info.totalJSHeapSize = heapStatistics.total_physical_size();
  78     info.jsHeapSizeLimit = heapStatistics.heap_size_limit();
  79 }
  80
  81 size_t ScriptGCEvent::getUsedHeapSize()
  82 {
  83     v8::HeapStatistics heapStatistics;
  84     v8::Isolate::GetCurrent()->GetHeapStatistics(&heapStatistics);
  85     return heapStatistics.used_heap_size();
  86 }
  87
  88 void ScriptGCEvent::gcPrologueCallback(v8::GCType type, v8::GCCallbackFlags flags)
  89 {
  90     GCEventData* gcEventData = isolateGCEventData();
  91     gcEventData->setStartTime(WTF::monotonicallyIncreasingTime());
  92     gcEventData->setUsedHeapSize(getUsedHeapSize());
  93 }
  94
  95 void ScriptGCEvent::gcEpilogueCallback(v8::GCType type, v8::GCCallbackFlags flags)
  96 {
  97     GCEventData* gcEventData = isolateGCEventData();
  98     if (!gcEventData->usedHeapSize())
  99         return;
 100     double endTime = WTF::monotonicallyIncreasingTime();
 101     size_t usedHeapSize = getUsedHeapSize();
 102     size_t collectedBytes = usedHeapSize > gcEventData->usedHeapSize() ? 0 : gcEventData->usedHeapSize() - usedHeapSize;
 103     GCEventData::GCEventListeners& listeners = gcEventData->listeners();
 104     for (GCEventData::GCEventListeners::iterator i = listeners.begin(); i != listeners.end(); ++i)
 105         (*i)->didGC(gcEventData->startTime(), endTime, collectedBytes);
 106     gcEventData->clear();
 107 }
 108
 109 } // namespace blink
 110