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/*
* Copyright (C) 2010 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 WrapperTypeInfo_h
#define WrapperTypeInfo_h
#include "wtf/Assertions.h"
#include <v8.h>
namespace WebCore {
class ActiveDOMObject;
class DOMDataStore;
class EventTarget;
class Node;
static const int v8DOMWrapperTypeIndex = 0;
static const int v8DOMWrapperObjectIndex = 1;
static const int v8DefaultWrapperInternalFieldCount = 2;
static const int v8PrototypeTypeIndex = 0;
static const int v8PrototypeInternalFieldcount = 1;
static const uint16_t v8DOMNodeClassId = 1;
static const uint16_t v8DOMObjectClassId = 2;
enum WrapperWorldType {
MainWorld,
IsolatedWorld,
WorkerWorld
};
typedef v8::Handle<v8::FunctionTemplate> (*GetTemplateFunction)(v8::Isolate*, WrapperWorldType);
typedef void (*DerefObjectFunction)(void*);
typedef ActiveDOMObject* (*ToActiveDOMObjectFunction)(v8::Handle<v8::Object>);
typedef EventTarget* (*ToEventTargetFunction)(v8::Handle<v8::Object>);
typedef void* (*OpaqueRootForGC)(void*, v8::Isolate*);
typedef void (*InstallPerContextEnabledPrototypePropertiesFunction)(v8::Handle<v8::Object>, v8::Isolate*);
enum WrapperTypePrototype {
WrapperTypeObjectPrototype,
WrapperTypeErrorPrototype
};
// This struct provides a way to store a bunch of information that is helpful when unwrapping
// v8 objects. Each v8 bindings class has exactly one static WrapperTypeInfo member, so
// comparing pointers is a safe way to determine if types match.
struct WrapperTypeInfo {
static const WrapperTypeInfo* unwrap(v8::Handle<v8::Value> typeInfoWrapper)
{
return reinterpret_cast<const WrapperTypeInfo*>(v8::External::Cast(*typeInfoWrapper)->Value());
}
bool equals(const WrapperTypeInfo* that) const
{
return this == that;
}
bool isSubclass(const WrapperTypeInfo* that) const
{
for (const WrapperTypeInfo* current = this; current; current = current->parentClass) {
if (current == that)
return true;
}
return false;
}
v8::Handle<v8::FunctionTemplate> getTemplate(v8::Isolate* isolate, WrapperWorldType worldType) const { return getTemplateFunction(isolate, worldType); }
void derefObject(void* object) const
{
if (derefObjectFunction)
derefObjectFunction(object);
}
void installPerContextEnabledPrototypeProperties(v8::Handle<v8::Object> proto, v8::Isolate* isolate) const
{
if (installPerContextEnabledPrototypePropertiesFunction)
installPerContextEnabledPrototypePropertiesFunction(proto, isolate);
}
ActiveDOMObject* toActiveDOMObject(v8::Handle<v8::Object> object) const
{
if (!toActiveDOMObjectFunction)
return 0;
return toActiveDOMObjectFunction(object);
}
EventTarget* toEventTarget(v8::Handle<v8::Object> object) const
{
if (!toEventTargetFunction)
return 0;
return toEventTargetFunction(object);
}
void* opaqueRootForGC(void* object, v8::Isolate* isolate) const
{
if (!opaqueRootForGCFunction)
return object;
return opaqueRootForGCFunction(object, isolate);
}
const GetTemplateFunction getTemplateFunction;
const DerefObjectFunction derefObjectFunction;
const ToActiveDOMObjectFunction toActiveDOMObjectFunction;
const ToEventTargetFunction toEventTargetFunction;
const OpaqueRootForGC opaqueRootForGCFunction;
const InstallPerContextEnabledPrototypePropertiesFunction installPerContextEnabledPrototypePropertiesFunction;
const WrapperTypeInfo* parentClass;
const WrapperTypePrototype wrapperTypePrototype;
};
template<typename T, int offset>
inline T* getInternalField(const v8::Persistent<v8::Object>& persistent)
{
// This would be unsafe, but InternalFieldCount and GetAlignedPointerFromInternalField are guaranteed not to allocate
const v8::Handle<v8::Object>& object = reinterpret_cast<const v8::Handle<v8::Object>&>(persistent);
ASSERT(offset < object->InternalFieldCount());
return static_cast<T*>(object->GetAlignedPointerFromInternalField(offset));
}
template<typename T, int offset>
inline T* getInternalField(v8::Handle<v8::Object> object)
{
ASSERT(offset < object->InternalFieldCount());
return static_cast<T*>(object->GetAlignedPointerFromInternalField(offset));
}
inline void* toNative(const v8::Persistent<v8::Object>& object)
{
return getInternalField<void, v8DOMWrapperObjectIndex>(object);
}
inline void* toNative(v8::Handle<v8::Object> object)
{
return getInternalField<void, v8DOMWrapperObjectIndex>(object);
}
inline const WrapperTypeInfo* toWrapperTypeInfo(const v8::Persistent<v8::Object>& object)
{
return getInternalField<WrapperTypeInfo, v8DOMWrapperTypeIndex>(object);
}
inline const WrapperTypeInfo* toWrapperTypeInfo(v8::Handle<v8::Object> object)
{
return getInternalField<WrapperTypeInfo, v8DOMWrapperTypeIndex>(object);
}
struct WrapperConfiguration {
enum Lifetime {
Dependent, Independent
};
void configureWrapper(v8::Persistent<v8::Object>* wrapper) const
{
wrapper->SetWrapperClassId(classId);
if (lifetime == Independent)
wrapper->MarkIndependent();
}
const uint16_t classId;
const Lifetime lifetime;
};
inline WrapperConfiguration buildWrapperConfiguration(void*, WrapperConfiguration::Lifetime lifetime)
{
WrapperConfiguration configuration = {v8DOMObjectClassId, lifetime};
return configuration;
}
inline WrapperConfiguration buildWrapperConfiguration(Node*, WrapperConfiguration::Lifetime lifetime)
{
WrapperConfiguration configuration = {v8DOMNodeClassId, lifetime};
return configuration;
}
template<class ElementType>
class WrapperTypeTraits {
// specialized classes have thier own functions, which are generated by binding generator.
};
}
#endif // WrapperTypeInfo_h