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
42namespace blink {
43
44static 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
71v8::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
84bool 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