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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 "V8DOMWrapper.h"
#include <wtf/ArrayBufferView.h>
#include "DocumentLoader.h"
#include "EventTargetHeaders.h"
#include "EventTargetInterfaces.h"
#include "Frame.h"
#include "FrameLoaderClient.h"
#include "StylePropertySet.h"
#include "V8AbstractEventListener.h"
#include "V8Binding.h"
#include "V8Collection.h"
#include "V8EventListener.h"
#include "V8EventListenerList.h"
#include "V8HTMLCollection.h"
#include "V8HTMLDocument.h"
#include "V8HiddenPropertyName.h"
#include "V8Location.h"
#include "V8NamedNodeMap.h"
#include "V8NodeFilterCondition.h"
#include "V8NodeList.h"
#include "V8ObjectConstructor.h"
#include "V8PerContextData.h"
#include "V8StyleSheet.h"
#include "V8WorkerContextEventListener.h"
#include "WebGLContextAttributes.h"
#include "WebGLUniformLocation.h"
#include "WrapperTypeInfo.h"
#include <algorithm>
#include <utility>
#include <v8-debug.h>
#include <wtf/Assertions.h>
#include <wtf/OwnArrayPtr.h>
#include <wtf/StdLibExtras.h>
#include <wtf/UnusedParam.h>
namespace WebCore {
class V8WrapperInstantiationScope {
public:
explicit V8WrapperInstantiationScope(v8::Handle<v8::Object> creationContext)
: m_didEnterContext(false)
, m_context(v8::Context::GetCurrent())
{
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(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;
};
void V8DOMWrapper::setNamedHiddenReference(v8::Handle<v8::Object> parent, const char* name, v8::Handle<v8::Value> child)
{
ASSERT(name);
parent->SetHiddenValue(V8HiddenPropertyName::hiddenReferenceName(name, strlen(name)), child);
}
WrapperTypeInfo* V8DOMWrapper::domWrapperType(v8::Handle<v8::Object> object)
{
ASSERT(V8DOMWrapper::maybeDOMWrapper(object));
return toWrapperTypeInfo(object);
}
PassRefPtr<NodeFilter> V8DOMWrapper::wrapNativeNodeFilter(v8::Handle<v8::Value> filter)
{
// A NodeFilter is used when walking through a DOM tree or iterating tree
// nodes.
// FIXME: we may want to cache NodeFilterCondition and NodeFilter
// object, but it is minor.
// NodeFilter is passed to NodeIterator that has a ref counted pointer
// to NodeFilter. NodeFilter has a ref counted pointer to NodeFilterCondition.
// In NodeFilterCondition, filter object is persisted in its constructor,
// and disposed in its destructor.
return NodeFilter::create(V8NodeFilterCondition::create(filter));
}
v8::Local<v8::Object> V8DOMWrapper::instantiateV8Object(v8::Handle<v8::Object> creationContext, WrapperTypeInfo* type, void* impl)
{
V8WrapperInstantiationScope scope(creationContext);
V8PerContextData* perContextData = V8PerContextData::from(scope.context());
v8::Local<v8::Object> instance = perContextData ? perContextData->createWrapperFromCache(type) : V8ObjectConstructor::newInstance(type->getTemplate()->GetFunction());
// Avoid setting the DOM wrapper for failed allocations.
if (instance.IsEmpty())
return instance;
if (type == &V8HTMLDocument::info)
instance = V8HTMLDocument::wrapInShadowObject(instance, static_cast<Node*>(impl));
return instance;
}
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;
ASSERT(object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
return true;
}
#endif
bool V8DOMWrapper::isWrapperOfType(v8::Handle<v8::Value> value, WrapperTypeInfo* type)
{
if (!hasInternalField(value))
return false;
v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(value);
ASSERT(object->InternalFieldCount() >= v8DefaultWrapperInternalFieldCount);
ASSERT(object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
WrapperTypeInfo* typeInfo = static_cast<WrapperTypeInfo*>(object->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
return typeInfo == type;
}
#define TRY_TO_WRAP_WITH_INTERFACE(interfaceName) \
if (eventNames().interfaceFor##interfaceName == desiredInterface) \
return toV8(static_cast<interfaceName*>(target), creationContext, isolate);
// A JS object of type EventTarget is limited to a small number of possible classes.
v8::Handle<v8::Value> V8DOMWrapper::convertEventTargetToV8Object(EventTarget* target, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
{
if (!target)
return v8NullWithCheck(isolate);
AtomicString desiredInterface = target->interfaceName();
DOM_EVENT_TARGET_INTERFACES_FOR_EACH(TRY_TO_WRAP_WITH_INTERFACE)
ASSERT_NOT_REACHED();
return v8Undefined();
}
PassRefPtr<EventListener> V8DOMWrapper::getEventListener(v8::Local<v8::Value> value, bool isAttribute, ListenerLookupType lookup)
{
v8::Handle<v8::Context> context = v8::Context::GetCurrent();
if (context.IsEmpty())
return 0;
if (lookup == ListenerFindOnly)
return V8EventListenerList::findWrapper(value, isAttribute);
if (isWrapperOfType(toInnerGlobalObject(context), &V8DOMWindow::info))
return V8EventListenerList::findOrCreateWrapper<V8EventListener>(value, isAttribute);
#if ENABLE(WORKERS)
return V8EventListenerList::findOrCreateWrapper<V8WorkerContextEventListener>(value, isAttribute);
#else
return 0;
#endif
}
} // namespace WebCore
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