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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 #ifndef ScriptGCEvent_h
     32 #define ScriptGCEvent_h
     33 
     34 #include "wtf/Vector.h"
     35 #include <v8.h>
     36 
     37 namespace WebCore {
     38 
     39 struct HeapInfo {
     40     HeapInfo()
     41         : usedJSHeapSize(0)
     42         , totalJSHeapSize(0)
     43         , jsHeapSizeLimit(0)
     44     {
     45     }
     46 
     47     size_t usedJSHeapSize;
     48     size_t totalJSHeapSize;
     49     size_t jsHeapSizeLimit;
     50 };
     51 
     52 class ScriptGCEventListener;
     53 
     54 class GCEventData {
     55 public:
     56     typedef Vector<ScriptGCEventListener*> GCEventListeners;
     57 
     58     GCEventData()
     59         : m_startTime(0.0)
     60         , m_usedHeapSize(0)
     61     { }
     62 
     63     void clear()
     64     {
     65         m_startTime = 0.0;
     66         m_usedHeapSize = 0;
     67     }
     68 
     69     GCEventListeners& listeners() { return m_listeners; }
     70 
     71     double startTime() { return m_startTime; }
     72     void setStartTime(double startTime) { m_startTime = startTime; }
     73     size_t usedHeapSize() { return m_usedHeapSize; }
     74     void setUsedHeapSize(size_t usedHeapSize) { m_usedHeapSize = usedHeapSize; }
     75 
     76 private:
     77     double m_startTime;
     78     size_t m_usedHeapSize;
     79     GCEventListeners m_listeners;
     80 };
     81 
     82 
     83 // FIXME(361045): remove ScriptGCEvent once DevTools Timeline migrates to tracing.
     84 class ScriptGCEvent
     85 {
     86 public:
     87     static void addEventListener(ScriptGCEventListener*);
     88     static void removeEventListener(ScriptGCEventListener*);
     89     static void getHeapSize(HeapInfo&);
     90 
     91 private:
     92     static void gcEpilogueCallback(v8::GCType type, v8::GCCallbackFlags flags);
     93     static void gcPrologueCallback(v8::GCType type, v8::GCCallbackFlags flags);
     94     static size_t getUsedHeapSize();
     95 };
     96 
     97 
     98 } // namespace WebCore
     99 
    100 #endif // !defined(ScriptGCEvent_h)
    101