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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 "bindings/core/v8/V8DOMWrapper.h"
     33 
     34 #include "bindings/core/v8/V8Binding.h"
     35 #include "bindings/core/v8/V8HTMLCollection.h"
     36 #include "bindings/core/v8/V8HTMLDocument.h"
     37 #include "bindings/core/v8/V8ObjectConstructor.h"
     38 #include "bindings/core/v8/V8PerContextData.h"
     39 #include "bindings/core/v8/V8ScriptRunner.h"
     40 #include "bindings/core/v8/V8Window.h"
     41 
     42 namespace blink {
     43 
     44 static v8::Local<v8::Object> wrapInShadowTemplate(v8::Local<v8::Object> wrapper, ScriptWrappableBase* internalPointer, v8::Isolate* isolate)
     45 {
     46     static int shadowTemplateKey; // This address is used for a key to look up the dom template.
     47     V8PerIsolateData* data = V8PerIsolateData::from(isolate);
     48     v8::Handle<v8::FunctionTemplate> shadowTemplate = data->existingDOMTemplate(&shadowTemplateKey);
     49     if (shadowTemplate.IsEmpty()) {
     50         shadowTemplate = v8::FunctionTemplate::New(isolate);
     51         if (shadowTemplate.IsEmpty())
     52             return v8::Local<v8::Object>();
     53         shadowTemplate->SetClassName(v8AtomicString(isolate, "HTMLDocument"));
     54         shadowTemplate->Inherit(V8HTMLDocument::domTemplate(isolate));
     55         shadowTemplate->InstanceTemplate()->SetInternalFieldCount(V8HTMLDocument::internalFieldCount);
     56         data->setDOMTemplate(&shadowTemplateKey, shadowTemplate);
     57     }
     58 
     59     v8::Local<v8::Function> shadowConstructor = shadowTemplate->GetFunction();
     60     if (shadowConstructor.IsEmpty())
     61         return v8::Local<v8::Object>();
     62 
     63     v8::Local<v8::Object> shadow = V8ScriptRunner::instantiateObject(isolate, shadowConstructor);
     64     if (shadow.IsEmpty())
     65         return v8::Local<v8::Object>();
     66     shadow->SetPrototype(wrapper);
     67     V8DOMWrapper::setNativeInfoForHiddenWrapper(wrapper, &V8HTMLDocument::wrapperTypeInfo, internalPointer);
     68     return shadow;
     69 }
     70 
     71 v8::Local<v8::Object> V8DOMWrapper::createWrapper(v8::Handle<v8::Object> creationContext, const WrapperTypeInfo* type, ScriptWrappableBase* internalPointer, v8::Isolate* isolate)
     72 {
     73     V8WrapperInstantiationScope scope(creationContext, isolate);
     74 
     75     V8PerContextData* perContextData = V8PerContextData::from(scope.context());
     76     v8::Local<v8::Object> wrapper = perContextData ? perContextData->createWrapperFromCache(type) : V8ObjectConstructor::newInstance(isolate, type->domTemplate(isolate)->GetFunction());
     77 
     78     if (type == &V8HTMLDocument::wrapperTypeInfo && !wrapper.IsEmpty())
     79         wrapper = wrapInShadowTemplate(wrapper, internalPointer, isolate);
     80 
     81     return wrapper;
     82 }
     83 
     84 bool V8DOMWrapper::isDOMWrapper(v8::Handle<v8::Value> value)
     85 {
     86     if (value.IsEmpty() || !value->IsObject())
     87         return false;
     88 
     89     if (v8::Handle<v8::Object>::Cast(value)->InternalFieldCount() < v8DefaultWrapperInternalFieldCount)
     90         return false;
     91 
     92     v8::Handle<v8::Object> wrapper = v8::Handle<v8::Object>::Cast(value);
     93     ASSERT(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
     94     ASSERT(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
     95 
     96     const WrapperTypeInfo* typeInfo = static_cast<const WrapperTypeInfo*>(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
     97     // FIXME: We should add a more strict way to check if the typeInfo is a typeInfo of some DOM wrapper.
     98     // Even if it's a typeInfo of Blink, it's not guaranteed that it's a typeInfo of a DOM wrapper.
     99     return typeInfo->ginEmbedder == gin::kEmbedderBlink;
    100 }
    101 
    102 } // namespace blink
    103