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      1 /*
      2  * Copyright (C) 2013 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
      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. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "bindings/core/v8/V8MutationCallback.h"
     28 
     29 #include "bindings/core/v8/ScriptController.h"
     30 #include "bindings/core/v8/V8Binding.h"
     31 #include "bindings/core/v8/V8HiddenValue.h"
     32 #include "bindings/core/v8/V8MutationObserver.h"
     33 #include "bindings/core/v8/V8MutationRecord.h"
     34 #include "core/dom/ExecutionContext.h"
     35 #include "wtf/Assertions.h"
     36 
     37 namespace blink {
     38 
     39 V8MutationCallback::V8MutationCallback(v8::Handle<v8::Function> callback, v8::Handle<v8::Object> owner, ScriptState* scriptState)
     40     : ActiveDOMCallback(scriptState->executionContext())
     41     , m_callback(scriptState->isolate(), callback)
     42     , m_scriptState(scriptState)
     43 {
     44     V8HiddenValue::setHiddenValue(scriptState->isolate(), owner, V8HiddenValue::callback(scriptState->isolate()), callback);
     45     m_callback.setWeak(this, &setWeakCallback);
     46 }
     47 
     48 void V8MutationCallback::call(const WillBeHeapVector<RefPtrWillBeMember<MutationRecord> >& mutations, MutationObserver* observer)
     49 {
     50     if (!canInvokeCallback())
     51         return;
     52 
     53     v8::Isolate* isolate = m_scriptState->isolate();
     54 
     55     if (m_scriptState->contextIsValid())
     56         return;
     57     ScriptState::Scope scope(m_scriptState.get());
     58 
     59     if (m_callback.isEmpty())
     60         return;
     61     v8::Handle<v8::Value> observerHandle = toV8(observer, m_scriptState->context()->Global(), isolate);
     62     if (observerHandle.IsEmpty()) {
     63         if (!isScriptControllerTerminating())
     64             CRASH();
     65         return;
     66     }
     67 
     68     if (!observerHandle->IsObject())
     69         return;
     70 
     71     v8::Handle<v8::Object> thisObject = v8::Handle<v8::Object>::Cast(observerHandle);
     72     v8::Handle<v8::Value> argv[] = { v8Array(mutations, m_scriptState->context()->Global(), isolate), observerHandle };
     73 
     74     v8::TryCatch exceptionCatcher;
     75     exceptionCatcher.SetVerbose(true);
     76     ScriptController::callFunction(executionContext(), m_callback.newLocal(isolate), thisObject, WTF_ARRAY_LENGTH(argv), argv, isolate);
     77 }
     78 
     79 void V8MutationCallback::setWeakCallback(const v8::WeakCallbackData<v8::Function, V8MutationCallback>& data)
     80 {
     81     data.GetParameter()->m_callback.clear();
     82 }
     83 
     84 } // namespace blink
     85