runtime/ArrayBuffer.cpp

   1 /*
   2  * Copyright (C) 2009, 2013 Apple 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
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "ArrayBuffer.h"
  28
  29 #include "ArrayBufferNeuteringWatchpoint.h"
  30 #include "JSArrayBufferView.h"
  31 #include "JSCInlines.h"
  32 #include <wtf/RefPtr.h>
  33
  34 namespace JSC {
  35
  36 bool ArrayBuffer::transfer(ArrayBufferContents& result)
  37 {
  38     Ref<ArrayBuffer> protect(*this);
  39
  40     if (!m_contents.m_data) {
  41         result.m_data = 0;
  42         return false;
  43     }
  44
  45     bool isNeuterable = !m_pinCount;
  46
  47     if (isNeuterable)
  48         m_contents.transfer(result);
  49     else {
  50         m_contents.copyTo(result);
  51         if (!result.m_data)
  52             return false;
  53     }
  54
  55     for (size_t i = numberOfIncomingReferences(); i--;) {
  56         JSCell* cell = incomingReferenceAt(i);
  57         if (JSArrayBufferView* view = jsDynamicCast<JSArrayBufferView*>(cell))
  58             view->neuter();
  59         else if (ArrayBufferNeuteringWatchpoint* watchpoint = jsDynamicCast<ArrayBufferNeuteringWatchpoint*>(cell))
  60             watchpoint->fireAll();
  61     }
  62     return true;
  63 }
  64
  65 } // namespace JSC
  66