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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/core/v8/DOMDataStore.h"
#include "bindings/core/v8/ScriptWrappable.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RawPtr.h"
#include "wtf/text/AtomicString.h"
#include <v8.h>
namespace blink {
class Node;
struct WrapperTypeInfo;
class V8DOMWrapper {
public:
static v8::Local<v8::Object> createWrapper(v8::Isolate*, v8::Handle<v8::Object> creationContext, const WrapperTypeInfo*, ScriptWrappable*);
static v8::Handle<v8::Object> associateObjectWithWrapper(v8::Isolate*, ScriptWrappable*, const WrapperTypeInfo*, v8::Handle<v8::Object>);
static v8::Handle<v8::Object> associateObjectWithWrapper(v8::Isolate*, Node*, const WrapperTypeInfo*, v8::Handle<v8::Object>);
static void setNativeInfo(v8::Handle<v8::Object>, const WrapperTypeInfo*, ScriptWrappable*);
static void clearNativeInfo(v8::Handle<v8::Object>, const WrapperTypeInfo*);
// Note: This function is only for ASSERT() purposes. isDOMWrapper() may
// return true for non-DOM wrapper in some cases.
static bool isDOMWrapper(v8::Handle<v8::Value>);
};
inline void V8DOMWrapper::setNativeInfo(v8::Handle<v8::Object> wrapper, const WrapperTypeInfo* wrapperTypeInfo, ScriptWrappable* scriptWrappable)
{
ASSERT(wrapper->InternalFieldCount() >= 2);
ASSERT(scriptWrappable);
ASSERT(wrapperTypeInfo);
wrapper->SetAlignedPointerInInternalField(v8DOMWrapperObjectIndex, scriptWrappable);
wrapper->SetAlignedPointerInInternalField(v8DOMWrapperTypeIndex, const_cast<WrapperTypeInfo*>(wrapperTypeInfo));
}
inline void V8DOMWrapper::clearNativeInfo(v8::Handle<v8::Object> wrapper, const WrapperTypeInfo* wrapperTypeInfo)
{
ASSERT(wrapper->InternalFieldCount() >= 2);
ASSERT(wrapperTypeInfo);
// clearNativeInfo() is used only by NP objects, which are not garbage collected.
ASSERT(wrapperTypeInfo->gcType == WrapperTypeInfo::RefCountedObject);
wrapper->SetAlignedPointerInInternalField(v8DOMWrapperTypeIndex, const_cast<WrapperTypeInfo*>(wrapperTypeInfo));
wrapper->SetAlignedPointerInInternalField(v8DOMWrapperObjectIndex, 0);
}
inline v8::Handle<v8::Object> V8DOMWrapper::associateObjectWithWrapper(v8::Isolate* isolate, ScriptWrappable* impl, const WrapperTypeInfo* wrapperTypeInfo, v8::Handle<v8::Object> wrapper)
{
wrapperTypeInfo->refObject(impl);
setNativeInfo(wrapper, wrapperTypeInfo, impl);
ASSERT(isDOMWrapper(wrapper));
DOMDataStore::setWrapper(impl, wrapper, isolate, wrapperTypeInfo);
return wrapper;
}
inline v8::Handle<v8::Object> V8DOMWrapper::associateObjectWithWrapper(v8::Isolate* isolate, Node* node, const WrapperTypeInfo* wrapperTypeInfo, v8::Handle<v8::Object> wrapper)
{
wrapperTypeInfo->refObject(ScriptWrappable::fromNode(node));
setNativeInfo(wrapper, wrapperTypeInfo, ScriptWrappable::fromNode(node));
ASSERT(isDOMWrapper(wrapper));
DOMDataStore::setWrapper(node, wrapper, isolate, wrapperTypeInfo);
return wrapper;
}
class V8WrapperInstantiationScope {
public:
V8WrapperInstantiationScope(v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
: m_didEnterContext(false)
, m_context(isolate->GetCurrentContext())
{
// creationContext should not be empty. Because if we have an
// empty creationContext, we will end up creating
// a new object in the context currently entered. This is wrong.
RELEASE_ASSERT(!creationContext.IsEmpty());
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;
};
} // namespace blink
#endif // V8DOMWrapper_h
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