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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.
*/
#ifndef V8DOMWrapper_h
#define V8DOMWrapper_h
#include "bindings/v8/DOMDataStore.h"
#include <v8.h>
#include "wtf/PassRefPtr.h"
#include "wtf/text/AtomicString.h"
namespace WebCore {
struct WrapperTypeInfo;
class V8DOMWrapper {
public:
#ifndef NDEBUG
// Checks if a v8 value can be a DOM wrapper
static bool maybeDOMWrapper(v8::Handle<v8::Value>);
#endif
static v8::Local<v8::Object> createWrapper(v8::Handle<v8::Object> creationContext, const WrapperTypeInfo*, void*, v8::Isolate*);
template<typename V8T, typename T>
static inline v8::Handle<v8::Object> associateObjectWithWrapper(PassRefPtr<T>, const WrapperTypeInfo*, v8::Handle<v8::Object>, v8::Isolate*, WrapperConfiguration::Lifetime);
static inline void setNativeInfo(v8::Handle<v8::Object>, const WrapperTypeInfo*, void*);
static inline void clearNativeInfo(v8::Handle<v8::Object>, const WrapperTypeInfo*);
static bool isDOMWrapper(v8::Handle<v8::Value>);
static bool isWrapperOfType(v8::Handle<v8::Value>, const WrapperTypeInfo*);
};
inline void V8DOMWrapper::setNativeInfo(v8::Handle<v8::Object> wrapper, const WrapperTypeInfo* type, void* object)
{
ASSERT(wrapper->InternalFieldCount() >= 2);
ASSERT(object);
ASSERT(type);
wrapper->SetAlignedPointerInInternalField(v8DOMWrapperObjectIndex, object);
wrapper->SetAlignedPointerInInternalField(v8DOMWrapperTypeIndex, const_cast<WrapperTypeInfo*>(type));
}
inline void V8DOMWrapper::clearNativeInfo(v8::Handle<v8::Object> wrapper, const WrapperTypeInfo* type)
{
ASSERT(wrapper->InternalFieldCount() >= 2);
ASSERT(type);
wrapper->SetAlignedPointerInInternalField(v8DOMWrapperTypeIndex, const_cast<WrapperTypeInfo*>(type));
wrapper->SetAlignedPointerInInternalField(v8DOMWrapperObjectIndex, 0);
}
template<typename V8T, typename T>
inline v8::Handle<v8::Object> V8DOMWrapper::associateObjectWithWrapper(PassRefPtr<T> object, const WrapperTypeInfo* type, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate, WrapperConfiguration::Lifetime lifetime)
{
setNativeInfo(wrapper, type, V8T::toInternalPointer(object.get()));
ASSERT(maybeDOMWrapper(wrapper));
WrapperConfiguration configuration = buildWrapperConfiguration(object.get(), lifetime);
DOMDataStore::setWrapper<V8T>(object.leakRef(), wrapper, isolate, configuration);
return wrapper;
}
class V8WrapperInstantiationScope {
public:
V8WrapperInstantiationScope(v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
: m_didEnterContext(false)
, m_context(isolate->GetCurrentContext())
{
// 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;
};
}
#endif // V8DOMWrapper_h
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