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      1 /*
      2  * Copyright (C) 2009 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 "DOMData.h"
     33 
     34 #include "ChildThreadDOMData.h"
     35 #include "MainThreadDOMData.h"
     36 #include "WebGLContextAttributes.h"
     37 #include "WebGLUniformLocation.h"
     38 
     39 namespace WebCore {
     40 
     41 DOMData::DOMData()
     42     : m_delayedProcessingScheduled(false)
     43     , m_isMainThread(WTF::isMainThread())
     44     , m_owningThread(WTF::currentThread())
     45 {
     46 }
     47 
     48 DOMData::~DOMData()
     49 {
     50 }
     51 
     52 DOMData* DOMData::getCurrent()
     53 {
     54     if (WTF::isMainThread())
     55         return MainThreadDOMData::getCurrent();
     56 
     57     DEFINE_STATIC_LOCAL(WTF::ThreadSpecific<ChildThreadDOMData>, childThreadDOMData, ());
     58     return childThreadDOMData;
     59 }
     60 
     61 void DOMData::ensureDeref(V8ClassIndex::V8WrapperType type, void* domObject)
     62 {
     63     if (m_owningThread == WTF::currentThread()) {
     64         // No need to delay the work. We can deref right now.
     65         derefObject(type, domObject);
     66         return;
     67     }
     68 
     69     // We need to do the deref on the correct thread.
     70     m_delayedObjectMap.set(domObject, type);
     71 
     72     // Post a task to the owning thread in order to process the delayed queue.
     73     // FIXME: For now, we can only post to main thread due to WTF task posting limitation. We will fix this when we work on nested worker.
     74     if (!m_delayedProcessingScheduled) {
     75         m_delayedProcessingScheduled = true;
     76         if (isMainThread())
     77             WTF::callOnMainThread(&derefDelayedObjectsInCurrentThread, 0);
     78     }
     79 }
     80 
     81 void DOMData::derefObject(V8ClassIndex::V8WrapperType type, void* domObject)
     82 {
     83     switch (type) {
     84     case V8ClassIndex::NODE:
     85         static_cast<Node*>(domObject)->deref();
     86         break;
     87 
     88 #define MakeCase(type, name)   \
     89         case V8ClassIndex::type: static_cast<name*>(domObject)->deref(); break;
     90     DOM_OBJECT_TYPES(MakeCase)   // This includes both active and non-active.
     91 #undef MakeCase
     92 
     93 #if ENABLE(SVG)
     94 #define MakeCase(type, name)     \
     95         case V8ClassIndex::type: static_cast<name*>(domObject)->deref(); break;
     96     SVG_OBJECT_TYPES(MakeCase)   // This also includes SVGElementInstance.
     97 #undef MakeCase
     98 
     99 #define MakeCase(type, name)     \
    100         case V8ClassIndex::type:    \
    101             static_cast<V8SVGPODTypeWrapper<name>*>(domObject)->deref(); break;
    102     SVG_POD_NATIVE_TYPES(MakeCase)
    103 #undef MakeCase
    104 #endif
    105 
    106     default:
    107         ASSERT_NOT_REACHED();
    108         break;
    109     }
    110 }
    111 
    112 void DOMData::derefDelayedObjects()
    113 {
    114     WTF::MutexLocker locker(DOMDataStore::allStoresMutex());
    115 
    116     m_delayedProcessingScheduled = false;
    117 
    118     for (DelayedObjectMap::iterator iter(m_delayedObjectMap.begin()); iter != m_delayedObjectMap.end(); ++iter)
    119         derefObject(iter->second, iter->first);
    120 
    121     m_delayedObjectMap.clear();
    122 }
    123 
    124 void DOMData::derefDelayedObjectsInCurrentThread(void*)
    125 {
    126     getCurrent()->derefDelayedObjects();
    127 }
    128 
    129 } // namespace WebCore
    130