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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "bindings/v8/V8DOMWrapper.h"
#include "V8HTMLCollection.h"
#include "V8HTMLDocument.h"
#include "V8Window.h"
#include "bindings/v8/V8Binding.h"
#include "bindings/v8/V8HiddenPropertyName.h"
#include "bindings/v8/V8ObjectConstructor.h"
#include "bindings/v8/V8PerContextData.h"
#include "bindings/v8/V8ScriptRunner.h"
namespace WebCore {
class V8WrapperInstantiationScope {
public:
V8WrapperInstantiationScope(v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
: m_didEnterContext(false)
, m_context(v8::Context::GetCurrent())
{
// FIXME: Remove all empty creationContexts from caller sites.
// If a creationContext is empty, we will end up creating a new object
// in the context currently entered. This is wrong.
if (creationContext.IsEmpty())
return;
v8::Handle<v8::Context> contextForWrapper = creationContext->CreationContext();
// For performance, we enter the context only if the currently running context
// is different from the context that we are about to enter.
if (contextForWrapper == m_context)
return;
m_context = v8::Local<v8::Context>::New(isolate, contextForWrapper);
m_didEnterContext = true;
m_context->Enter();
}
~V8WrapperInstantiationScope()
{
if (!m_didEnterContext)
return;
m_context->Exit();
}
v8::Handle<v8::Context> context() const { return m_context; }
private:
bool m_didEnterContext;
v8::Handle<v8::Context> m_context;
};
static v8::Local<v8::Object> wrapInShadowTemplate(v8::Local<v8::Object> wrapper, Node* impl, v8::Isolate* isolate)
{
// This is only for getting a unique pointer which we can pass to privateTemplate.
static int shadowTemplateUniqueKey;
WrapperWorldType currentWorldType = worldType(isolate);
V8PerIsolateData* data = V8PerIsolateData::from(isolate);
v8::Handle<v8::FunctionTemplate> shadowTemplate = data->privateTemplateIfExists(currentWorldType, &shadowTemplateUniqueKey);
if (shadowTemplate.IsEmpty()) {
shadowTemplate = v8::FunctionTemplate::New();
if (shadowTemplate.IsEmpty())
return v8::Local<v8::Object>();
shadowTemplate->SetClassName(v8::String::NewSymbol("HTMLDocument"));
shadowTemplate->Inherit(V8HTMLDocument::GetTemplate(isolate, currentWorldType));
shadowTemplate->InstanceTemplate()->SetInternalFieldCount(V8HTMLDocument::internalFieldCount);
data->setPrivateTemplate(currentWorldType, &shadowTemplateUniqueKey, shadowTemplate);
}
v8::Local<v8::Function> shadowConstructor = shadowTemplate->GetFunction();
if (shadowConstructor.IsEmpty())
return v8::Local<v8::Object>();
v8::Local<v8::Object> shadow = V8ScriptRunner::instantiateObject(shadowConstructor);
if (shadow.IsEmpty())
return v8::Local<v8::Object>();
shadow->SetPrototype(wrapper);
V8DOMWrapper::setNativeInfo(wrapper, &V8HTMLDocument::wrapperTypeInfo, impl);
return shadow;
}
v8::Local<v8::Object> V8DOMWrapper::createWrapper(v8::Handle<v8::Object> creationContext, const WrapperTypeInfo* type, void* impl, v8::Isolate* isolate)
{
V8WrapperInstantiationScope scope(creationContext, isolate);
V8PerContextData* perContextData = V8PerContextData::from(scope.context());
v8::Local<v8::Object> wrapper = perContextData ? perContextData->createWrapperFromCache(type) : V8ObjectConstructor::newInstance(type->getTemplate(isolate, worldTypeInMainThread(isolate))->GetFunction());
if (type == &V8HTMLDocument::wrapperTypeInfo && !wrapper.IsEmpty())
wrapper = wrapInShadowTemplate(wrapper, static_cast<Node*>(impl), isolate);
return wrapper;
}
static bool hasInternalField(v8::Handle<v8::Value> value)
{
if (value.IsEmpty() || !value->IsObject())
return false;
return v8::Handle<v8::Object>::Cast(value)->InternalFieldCount();
}
#ifndef NDEBUG
bool V8DOMWrapper::maybeDOMWrapper(v8::Handle<v8::Value> value)
{
if (!hasInternalField(value))
return false;
v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(value);
ASSERT(object->InternalFieldCount() >= v8DefaultWrapperInternalFieldCount);
v8::HandleScope scope(v8::Isolate::GetCurrent());
ASSERT(object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
return true;
}
#endif
bool V8DOMWrapper::isDOMWrapper(v8::Handle<v8::Value> value)
{
if (value.IsEmpty() || !value->IsObject())
return false;
v8::Handle<v8::Object> wrapper = v8::Handle<v8::Object>::Cast(value);
if (wrapper->InternalFieldCount() < v8DefaultWrapperInternalFieldCount)
return false;
ASSERT(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
ASSERT(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
// FIXME: Add class id checks.
return true;
}
bool V8DOMWrapper::isWrapperOfType(v8::Handle<v8::Value> value, const WrapperTypeInfo* type)
{
if (!hasInternalField(value))
return false;
v8::Handle<v8::Object> wrapper = v8::Handle<v8::Object>::Cast(value);
ASSERT(wrapper->InternalFieldCount() >= v8DefaultWrapperInternalFieldCount);
ASSERT(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
const WrapperTypeInfo* typeInfo = static_cast<const WrapperTypeInfo*>(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
return typeInfo == type;
}
} // namespace WebCore