third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp - chromium/src - Git at Google

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  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.
  * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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/core/v8/V8DOMConfiguration.h"

 #include "bindings/core/v8/V8ObjectConstructor.h"
 #include "platform/TraceEvent.h"

 namespace blink {

 namespace {

 void installAttributeInternal(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, const V8DOMConfiguration::AttributeConfiguration& attribute, const DOMWrapperWorld& world)
 {
     if (attribute.exposeConfiguration == V8DOMConfiguration::OnlyExposedToPrivateScript
         && !world.isPrivateScriptIsolatedWorld())
         return;

     v8::Local<v8::Name> name = v8AtomicString(isolate, attribute.name);
     v8::AccessorNameGetterCallback getter = attribute.getter;
     v8::AccessorNameSetterCallback setter = attribute.setter;
     if (world.isMainWorld()) {
         if (attribute.getterForMainWorld)
             getter = attribute.getterForMainWorld;
         if (attribute.setterForMainWorld)
             setter = attribute.setterForMainWorld;
     }
     v8::Local<v8::Value> data = v8::External::New(isolate, const_cast<WrapperTypeInfo*>(attribute.data));

     ASSERT(attribute.propertyLocationConfiguration);
     if (attribute.propertyLocationConfiguration & V8DOMConfiguration::OnInstance)
         instanceTemplate->SetAccessor(name, getter, setter, data, attribute.settings, attribute.attribute);
     if (attribute.propertyLocationConfiguration & V8DOMConfiguration::OnPrototype)
         prototypeTemplate->SetAccessor(name, getter, setter, data, attribute.settings, attribute.attribute);
     if (attribute.propertyLocationConfiguration & V8DOMConfiguration::OnInterface)
         ASSERT_NOT_REACHED();
 }

 template<class FunctionOrTemplate>
 v8::Local<FunctionOrTemplate> createAccessorFunctionOrTemplate(v8::Isolate*, v8::FunctionCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature>, int length);

 template<>
 v8::Local<v8::FunctionTemplate> createAccessorFunctionOrTemplate<v8::FunctionTemplate>(v8::Isolate* isolate, v8::FunctionCallback callback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
 {
     v8::Local<v8::FunctionTemplate> functionTemplate;
     if (callback) {
         functionTemplate = v8::FunctionTemplate::New(isolate, callback, data, signature, length);
         if (!functionTemplate.IsEmpty()) {
             functionTemplate->RemovePrototype();
             functionTemplate->SetAcceptAnyReceiver(false);
         }
     }
     return functionTemplate;
 }

 template<>
 v8::Local<v8::Function> createAccessorFunctionOrTemplate<v8::Function>(v8::Isolate* isolate, v8::FunctionCallback callback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
 {
     if (!callback)
         return v8::Local<v8::Function>();

     v8::Local<v8::FunctionTemplate> functionTemplate = createAccessorFunctionOrTemplate<v8::FunctionTemplate>(isolate, callback, data, signature, length);
     if (functionTemplate.IsEmpty())
         return v8::Local<v8::Function>();

     v8::Local<v8::Context> context = isolate->GetCurrentContext();
     v8::Local<v8::Function> function;
     if (!functionTemplate->GetFunction(context).ToLocal(&function))
         return v8::Local<v8::Function>();
     return function;
 }

 template<class ObjectOrTemplate, class FunctionOrTemplate>
 void installAccessorInternal(v8::Isolate* isolate, v8::Local<ObjectOrTemplate> instanceOrTemplate, v8::Local<ObjectOrTemplate> prototypeOrTemplate, v8::Local<FunctionOrTemplate> interfaceOrTemplate, v8::Local<v8::Signature> signature, const V8DOMConfiguration::AccessorConfiguration& accessor, const DOMWrapperWorld& world)
 {
     if (accessor.exposeConfiguration == V8DOMConfiguration::OnlyExposedToPrivateScript
         && !world.isPrivateScriptIsolatedWorld())
         return;

     v8::Local<v8::Name> name = v8AtomicString(isolate, accessor.name);
     v8::FunctionCallback getterCallback = accessor.getter;
     v8::FunctionCallback setterCallback = accessor.setter;
     if (world.isMainWorld()) {
         if (accessor.getterForMainWorld)
             getterCallback = accessor.getterForMainWorld;
         if (accessor.setterForMainWorld)
             setterCallback = accessor.setterForMainWorld;
     }
     // Support [LenientThis] by not specifying the signature.  V8 does not do
     // the type checking against holder if no signature is specified.  Note that
     // info.Holder() passed to callbacks will be *unsafe*.
     if (accessor.holderCheckConfiguration == V8DOMConfiguration::DoNotCheckHolder)
         signature = v8::Local<v8::Signature>();
     v8::Local<v8::Value> data = v8::External::New(isolate, const_cast<WrapperTypeInfo*>(accessor.data));

     ASSERT(accessor.propertyLocationConfiguration);
     if (accessor.propertyLocationConfiguration &
         (V8DOMConfiguration::OnInstance | V8DOMConfiguration::OnPrototype)) {
         v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, data, signature, 0);
         v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, data, signature, 1);
         if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnInstance)
             instanceOrTemplate->SetAccessorProperty(name, getter, setter, accessor.attribute, accessor.settings);
         if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnPrototype)
             prototypeOrTemplate->SetAccessorProperty(name, getter, setter, accessor.attribute, accessor.settings);
     }
     if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnInterface) {
         // Attributes installed on the interface object must be static
         // attributes, so no need to specify a signature, i.e. no need to do
         // type check against a holder.
         v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, data, v8::Local<v8::Signature>(), 0);
         v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, data, v8::Local<v8::Signature>(), 1);
         interfaceOrTemplate->SetAccessorProperty(name, getter, setter, accessor.attribute, accessor.settings);
     }
 }

 void installConstantInternal(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, v8::Local<v8::ObjectTemplate> prototypeTemplate, const V8DOMConfiguration::ConstantConfiguration& constant)
 {
     v8::Local<v8::String> constantName = v8AtomicString(isolate, constant.name);
     v8::PropertyAttribute attributes =
         static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete);
     v8::Local<v8::Primitive> value;
     switch (constant.type) {
     case V8DOMConfiguration::ConstantTypeShort:
     case V8DOMConfiguration::ConstantTypeLong:
     case V8DOMConfiguration::ConstantTypeUnsignedShort:
         value = v8::Integer::New(isolate, constant.ivalue);
         break;
     case V8DOMConfiguration::ConstantTypeUnsignedLong:
         value = v8::Integer::NewFromUnsigned(isolate, constant.ivalue);
         break;
     case V8DOMConfiguration::ConstantTypeFloat:
     case V8DOMConfiguration::ConstantTypeDouble:
         value = v8::Number::New(isolate, constant.dvalue);
         break;
     default:
         ASSERT_NOT_REACHED();
     }
     functionDescriptor->Set(constantName, value, attributes);
     prototypeTemplate->Set(constantName, value, attributes);
 }

 template<class Configuration>
 void installMethodInternal(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, v8::PropertyAttribute attribute, const Configuration& method, const DOMWrapperWorld& world)
 {
     if (method.exposeConfiguration == V8DOMConfiguration::OnlyExposedToPrivateScript
         && !world.isPrivateScriptIsolatedWorld())
         return;

     v8::Local<v8::Name> name = method.methodName(isolate);
     v8::FunctionCallback callback = method.callbackForWorld(world);

     ASSERT(method.propertyLocationConfiguration);
     if (method.propertyLocationConfiguration &
         (V8DOMConfiguration::OnInstance | V8DOMConfiguration::OnPrototype)) {
         v8::Local<v8::FunctionTemplate> functionTemplate = v8::FunctionTemplate::New(isolate, callback, v8::Local<v8::Value>(), signature, method.length);
         functionTemplate->RemovePrototype();
         if (method.propertyLocationConfiguration & V8DOMConfiguration::OnInstance)
             instanceTemplate->Set(name, functionTemplate, attribute);
         if (method.propertyLocationConfiguration & V8DOMConfiguration::OnPrototype)
             prototypeTemplate->Set(name, functionTemplate, attribute);
     }
     if (method.propertyLocationConfiguration & V8DOMConfiguration::OnInterface) {
         // Operations installed on the interface object must be static
         // operations, so no need to specify a signature, i.e. no need to do
         // type check against a holder.
         v8::Local<v8::FunctionTemplate> functionTemplate = v8::FunctionTemplate::New(isolate, callback, v8::Local<v8::Value>(), v8::Local<v8::Signature>(), method.length);
         functionTemplate->RemovePrototype();
         interfaceTemplate->Set(name, functionTemplate, attribute);
     }
 }

 } // namespace

 void V8DOMConfiguration::installAttributes(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, const AttributeConfiguration* attributes, size_t attributeCount)
 {
     const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     for (size_t i = 0; i < attributeCount; ++i)
         installAttributeInternal(isolate, instanceTemplate, prototypeTemplate, attributes[i], world);
 }

 void V8DOMConfiguration::installAttribute(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, const AttributeConfiguration& attribute)
 {
     const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     installAttributeInternal(isolate, instanceTemplate, prototypeTemplate, attribute, world);
 }

 void V8DOMConfiguration::installAccessors(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, const AccessorConfiguration* accessors, size_t accessorCount)
 {
     const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     for (size_t i = 0; i < accessorCount; ++i)
         installAccessorInternal(isolate, instanceTemplate, prototypeTemplate, interfaceTemplate, signature, accessors[i], world);
 }

 void V8DOMConfiguration::installAccessor(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, const AccessorConfiguration& accessor)
 {
     const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     installAccessorInternal(isolate, instanceTemplate, prototypeTemplate, interfaceTemplate, signature, accessor, world);
 }

 void V8DOMConfiguration::installAccessor(v8::Isolate* isolate, v8::Local<v8::Object> instance, v8::Local<v8::Object> prototype, v8::Local<v8::Function> interface, v8::Local<v8::Signature> signature, const AccessorConfiguration& accessor)
 {
     const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     installAccessorInternal(isolate, instance, prototype, interface, signature, accessor, world);
 }

 void V8DOMConfiguration::installConstants(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, v8::Local<v8::ObjectTemplate> prototypeTemplate, const ConstantConfiguration* constants, size_t constantCount)
 {
     for (size_t i = 0; i < constantCount; ++i)
         installConstantInternal(isolate, functionDescriptor, prototypeTemplate, constants[i]);
 }

 void V8DOMConfiguration::installConstant(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, v8::Local<v8::ObjectTemplate> prototypeTemplate, const ConstantConfiguration& constant)
 {
     installConstantInternal(isolate, functionDescriptor, prototypeTemplate, constant);
 }

 void V8DOMConfiguration::installConstantWithGetter(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, v8::Local<v8::ObjectTemplate> prototypeTemplate, const char* name, v8::AccessorNameGetterCallback getter)
 {
     v8::Local<v8::String> constantName = v8AtomicString(isolate, name);
     v8::PropertyAttribute attributes =
         static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete);
     functionDescriptor->SetNativeDataProperty(constantName, getter, 0, v8::Local<v8::Value>(), attributes);
     prototypeTemplate->SetNativeDataProperty(constantName, getter, 0, v8::Local<v8::Value>(), attributes);
 }

 void V8DOMConfiguration::installMethods(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, v8::PropertyAttribute attribute, const MethodConfiguration* methods, size_t methodCount)
 {
     const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     for (size_t i = 0; i < methodCount; ++i)
         installMethodInternal(isolate, instanceTemplate, prototypeTemplate, interfaceTemplate, signature, attribute, methods[i], world);
 }

 void V8DOMConfiguration::installMethod(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, v8::PropertyAttribute attribute, const MethodConfiguration& method)
 {
     const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     installMethodInternal(isolate, instanceTemplate, prototypeTemplate, interfaceTemplate, signature, attribute, method, world);
 }

 void V8DOMConfiguration::installMethod(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::Signature> signature, v8::PropertyAttribute attribute, const SymbolKeyedMethodConfiguration& method)
 {
     const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     installMethodInternal(isolate, v8::Local<v8::ObjectTemplate>(), prototypeTemplate, v8::Local<v8::FunctionTemplate>(), signature, attribute, method, world);
 }

 v8::Local<v8::Signature> V8DOMConfiguration::installDOMClassTemplate(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, const char* interfaceName, v8::Local<v8::FunctionTemplate> parentClass, size_t fieldCount,
     const AttributeConfiguration* attributes, size_t attributeCount,
     const AccessorConfiguration* accessors, size_t accessorCount,
     const MethodConfiguration* methods, size_t methodCount)
 {
     functionDescriptor->SetClassName(v8AtomicString(isolate, interfaceName));
     v8::Local<v8::ObjectTemplate> instanceTemplate = functionDescriptor->InstanceTemplate();
     v8::Local<v8::ObjectTemplate> prototypeTemplate = functionDescriptor->PrototypeTemplate();
     instanceTemplate->SetInternalFieldCount(fieldCount);
     if (!parentClass.IsEmpty()) {
         functionDescriptor->Inherit(parentClass);
         // Marks the prototype object as one of native-backed objects.
         // This is needed since bug 110436 asks WebKit to tell native-initiated prototypes from pure-JS ones.
         // This doesn't mark kinds "root" classes like Node, where setting this changes prototype chain structure.
         prototypeTemplate->SetInternalFieldCount(v8PrototypeInternalFieldcount);
     }

     v8::Local<v8::Signature> defaultSignature = v8::Signature::New(isolate, functionDescriptor);
     if (attributeCount)
         installAttributes(isolate, instanceTemplate, prototypeTemplate, attributes, attributeCount);
     if (accessorCount)
         installAccessors(isolate, instanceTemplate, prototypeTemplate, functionDescriptor, defaultSignature, accessors, accessorCount);
     if (methodCount)
         installMethods(isolate, instanceTemplate, prototypeTemplate, functionDescriptor, defaultSignature, static_cast<v8::PropertyAttribute>(v8::None), methods, methodCount);
     return defaultSignature;
 }

 v8::Local<v8::FunctionTemplate> V8DOMConfiguration::domClassTemplate(v8::Isolate* isolate, WrapperTypeInfo* wrapperTypeInfo, void (*configureDOMClassTemplate)(v8::Local<v8::FunctionTemplate>, v8::Isolate*))
 {
     V8PerIsolateData* data = V8PerIsolateData::from(isolate);
     v8::Local<v8::FunctionTemplate> result = data->existingDOMTemplate(wrapperTypeInfo);
     if (!result.IsEmpty())
         return result;

     TRACE_EVENT_SCOPED_SAMPLING_STATE("blink", "BuildDOMTemplate");
     result = v8::FunctionTemplate::New(isolate, V8ObjectConstructor::isValidConstructorMode);
     configureDOMClassTemplate(result, isolate);
     data->setDOMTemplate(wrapperTypeInfo, result);
     return result;
 }

 } // namespace blink
	/*
	* Copyright (C) 2012 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:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. 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.
	* 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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/core/v8/V8DOMConfiguration.h"

	#include "bindings/core/v8/V8ObjectConstructor.h"
	#include "platform/TraceEvent.h"

	namespace blink {

	namespace {

	void installAttributeInternal(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, const V8DOMConfiguration::AttributeConfiguration& attribute, const DOMWrapperWorld& world)
	{
	if (attribute.exposeConfiguration == V8DOMConfiguration::OnlyExposedToPrivateScript
	&& !world.isPrivateScriptIsolatedWorld())
	return;

	v8::Local<v8::Name> name = v8AtomicString(isolate, attribute.name);
	v8::AccessorNameGetterCallback getter = attribute.getter;
	v8::AccessorNameSetterCallback setter = attribute.setter;
	if (world.isMainWorld()) {
	if (attribute.getterForMainWorld)
	getter = attribute.getterForMainWorld;
	if (attribute.setterForMainWorld)
	setter = attribute.setterForMainWorld;
	}
	v8::Local<v8::Value> data = v8::External::New(isolate, const_cast<WrapperTypeInfo*>(attribute.data));

	ASSERT(attribute.propertyLocationConfiguration);
	if (attribute.propertyLocationConfiguration & V8DOMConfiguration::OnInstance)
	instanceTemplate->SetAccessor(name, getter, setter, data, attribute.settings, attribute.attribute);
	if (attribute.propertyLocationConfiguration & V8DOMConfiguration::OnPrototype)
	prototypeTemplate->SetAccessor(name, getter, setter, data, attribute.settings, attribute.attribute);
	if (attribute.propertyLocationConfiguration & V8DOMConfiguration::OnInterface)
	ASSERT_NOT_REACHED();
	}

	template<class FunctionOrTemplate>
	v8::Local<FunctionOrTemplate> createAccessorFunctionOrTemplate(v8::Isolate*, v8::FunctionCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature>, int length);

	template<>
	v8::Local<v8::FunctionTemplate> createAccessorFunctionOrTemplate<v8::FunctionTemplate>(v8::Isolate* isolate, v8::FunctionCallback callback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
	{
	v8::Local<v8::FunctionTemplate> functionTemplate;
	if (callback) {
	functionTemplate = v8::FunctionTemplate::New(isolate, callback, data, signature, length);
	if (!functionTemplate.IsEmpty()) {
	functionTemplate->RemovePrototype();
	functionTemplate->SetAcceptAnyReceiver(false);
	}
	}
	return functionTemplate;
	}

	template<>
	v8::Local<v8::Function> createAccessorFunctionOrTemplate<v8::Function>(v8::Isolate* isolate, v8::FunctionCallback callback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
	{
	if (!callback)
	return v8::Local<v8::Function>();

	v8::Local<v8::FunctionTemplate> functionTemplate = createAccessorFunctionOrTemplate<v8::FunctionTemplate>(isolate, callback, data, signature, length);
	if (functionTemplate.IsEmpty())
	return v8::Local<v8::Function>();

	v8::Local<v8::Context> context = isolate->GetCurrentContext();
	v8::Local<v8::Function> function;
	if (!functionTemplate->GetFunction(context).ToLocal(&function))
	return v8::Local<v8::Function>();
	return function;
	}

	template<class ObjectOrTemplate, class FunctionOrTemplate>
	void installAccessorInternal(v8::Isolate* isolate, v8::Local<ObjectOrTemplate> instanceOrTemplate, v8::Local<ObjectOrTemplate> prototypeOrTemplate, v8::Local<FunctionOrTemplate> interfaceOrTemplate, v8::Local<v8::Signature> signature, const V8DOMConfiguration::AccessorConfiguration& accessor, const DOMWrapperWorld& world)
	{
	if (accessor.exposeConfiguration == V8DOMConfiguration::OnlyExposedToPrivateScript
	&& !world.isPrivateScriptIsolatedWorld())
	return;

	v8::Local<v8::Name> name = v8AtomicString(isolate, accessor.name);
	v8::FunctionCallback getterCallback = accessor.getter;
	v8::FunctionCallback setterCallback = accessor.setter;
	if (world.isMainWorld()) {
	if (accessor.getterForMainWorld)
	getterCallback = accessor.getterForMainWorld;
	if (accessor.setterForMainWorld)
	setterCallback = accessor.setterForMainWorld;
	}
	// Support [LenientThis] by not specifying the signature. V8 does not do
	// the type checking against holder if no signature is specified. Note that
	// info.Holder() passed to callbacks will be unsafe.
	if (accessor.holderCheckConfiguration == V8DOMConfiguration::DoNotCheckHolder)
	signature = v8::Local<v8::Signature>();
	v8::Local<v8::Value> data = v8::External::New(isolate, const_cast<WrapperTypeInfo*>(accessor.data));

	ASSERT(accessor.propertyLocationConfiguration);
	if (accessor.propertyLocationConfiguration &
	(V8DOMConfiguration::OnInstance \| V8DOMConfiguration::OnPrototype)) {
	v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, data, signature, 0);
	v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, data, signature, 1);
	if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnInstance)
	instanceOrTemplate->SetAccessorProperty(name, getter, setter, accessor.attribute, accessor.settings);
	if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnPrototype)
	prototypeOrTemplate->SetAccessorProperty(name, getter, setter, accessor.attribute, accessor.settings);
	}
	if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnInterface) {
	// Attributes installed on the interface object must be static
	// attributes, so no need to specify a signature, i.e. no need to do
	// type check against a holder.
	v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, data, v8::Local<v8::Signature>(), 0);
	v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, data, v8::Local<v8::Signature>(), 1);
	interfaceOrTemplate->SetAccessorProperty(name, getter, setter, accessor.attribute, accessor.settings);
	}
	}

	void installConstantInternal(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, v8::Local<v8::ObjectTemplate> prototypeTemplate, const V8DOMConfiguration::ConstantConfiguration& constant)
	{
	v8::Local<v8::String> constantName = v8AtomicString(isolate, constant.name);
	v8::PropertyAttribute attributes =
	static_cast<v8::PropertyAttribute>(v8::ReadOnly \| v8::DontDelete);
	v8::Local<v8::Primitive> value;
	switch (constant.type) {
	case V8DOMConfiguration::ConstantTypeShort:
	case V8DOMConfiguration::ConstantTypeLong:
	case V8DOMConfiguration::ConstantTypeUnsignedShort:
	value = v8::Integer::New(isolate, constant.ivalue);
	break;
	case V8DOMConfiguration::ConstantTypeUnsignedLong:
	value = v8::Integer::NewFromUnsigned(isolate, constant.ivalue);
	break;
	case V8DOMConfiguration::ConstantTypeFloat:
	case V8DOMConfiguration::ConstantTypeDouble:
	value = v8::Number::New(isolate, constant.dvalue);
	break;
	default:
	ASSERT_NOT_REACHED();
	}
	functionDescriptor->Set(constantName, value, attributes);
	prototypeTemplate->Set(constantName, value, attributes);
	}

	template<class Configuration>
	void installMethodInternal(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, v8::PropertyAttribute attribute, const Configuration& method, const DOMWrapperWorld& world)
	{
	if (method.exposeConfiguration == V8DOMConfiguration::OnlyExposedToPrivateScript
	&& !world.isPrivateScriptIsolatedWorld())
	return;

	v8::Local<v8::Name> name = method.methodName(isolate);
	v8::FunctionCallback callback = method.callbackForWorld(world);

	ASSERT(method.propertyLocationConfiguration);
	if (method.propertyLocationConfiguration &
	(V8DOMConfiguration::OnInstance \| V8DOMConfiguration::OnPrototype)) {
	v8::Local<v8::FunctionTemplate> functionTemplate = v8::FunctionTemplate::New(isolate, callback, v8::Local<v8::Value>(), signature, method.length);
	functionTemplate->RemovePrototype();
	if (method.propertyLocationConfiguration & V8DOMConfiguration::OnInstance)
	instanceTemplate->Set(name, functionTemplate, attribute);
	if (method.propertyLocationConfiguration & V8DOMConfiguration::OnPrototype)
	prototypeTemplate->Set(name, functionTemplate, attribute);
	}
	if (method.propertyLocationConfiguration & V8DOMConfiguration::OnInterface) {
	// Operations installed on the interface object must be static
	// operations, so no need to specify a signature, i.e. no need to do
	// type check against a holder.
	v8::Local<v8::FunctionTemplate> functionTemplate = v8::FunctionTemplate::New(isolate, callback, v8::Local<v8::Value>(), v8::Local<v8::Signature>(), method.length);
	functionTemplate->RemovePrototype();
	interfaceTemplate->Set(name, functionTemplate, attribute);
	}
	}

	} // namespace

	void V8DOMConfiguration::installAttributes(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, const AttributeConfiguration* attributes, size_t attributeCount)
	{
	const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
	for (size_t i = 0; i < attributeCount; ++i)
	installAttributeInternal(isolate, instanceTemplate, prototypeTemplate, attributes[i], world);
	}

	void V8DOMConfiguration::installAttribute(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, const AttributeConfiguration& attribute)
	{
	const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
	installAttributeInternal(isolate, instanceTemplate, prototypeTemplate, attribute, world);
	}

	void V8DOMConfiguration::installAccessors(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, const AccessorConfiguration* accessors, size_t accessorCount)
	{
	const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
	for (size_t i = 0; i < accessorCount; ++i)
	installAccessorInternal(isolate, instanceTemplate, prototypeTemplate, interfaceTemplate, signature, accessors[i], world);
	}

	void V8DOMConfiguration::installAccessor(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, const AccessorConfiguration& accessor)
	{
	const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
	installAccessorInternal(isolate, instanceTemplate, prototypeTemplate, interfaceTemplate, signature, accessor, world);
	}

	void V8DOMConfiguration::installAccessor(v8::Isolate* isolate, v8::Local<v8::Object> instance, v8::Local<v8::Object> prototype, v8::Local<v8::Function> interface, v8::Local<v8::Signature> signature, const AccessorConfiguration& accessor)
	{
	const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
	installAccessorInternal(isolate, instance, prototype, interface, signature, accessor, world);
	}

	void V8DOMConfiguration::installConstants(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, v8::Local<v8::ObjectTemplate> prototypeTemplate, const ConstantConfiguration* constants, size_t constantCount)
	{
	for (size_t i = 0; i < constantCount; ++i)
	installConstantInternal(isolate, functionDescriptor, prototypeTemplate, constants[i]);
	}

	void V8DOMConfiguration::installConstant(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, v8::Local<v8::ObjectTemplate> prototypeTemplate, const ConstantConfiguration& constant)
	{
	installConstantInternal(isolate, functionDescriptor, prototypeTemplate, constant);
	}

	void V8DOMConfiguration::installConstantWithGetter(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, v8::Local<v8::ObjectTemplate> prototypeTemplate, const char* name, v8::AccessorNameGetterCallback getter)
	{
	v8::Local<v8::String> constantName = v8AtomicString(isolate, name);
	v8::PropertyAttribute attributes =
	static_cast<v8::PropertyAttribute>(v8::ReadOnly \| v8::DontDelete);
	functionDescriptor->SetNativeDataProperty(constantName, getter, 0, v8::Local<v8::Value>(), attributes);
	prototypeTemplate->SetNativeDataProperty(constantName, getter, 0, v8::Local<v8::Value>(), attributes);
	}

	void V8DOMConfiguration::installMethods(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, v8::PropertyAttribute attribute, const MethodConfiguration* methods, size_t methodCount)
	{
	const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
	for (size_t i = 0; i < methodCount; ++i)
	installMethodInternal(isolate, instanceTemplate, prototypeTemplate, interfaceTemplate, signature, attribute, methods[i], world);
	}

	void V8DOMConfiguration::installMethod(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> instanceTemplate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::FunctionTemplate> interfaceTemplate, v8::Local<v8::Signature> signature, v8::PropertyAttribute attribute, const MethodConfiguration& method)
	{
	const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
	installMethodInternal(isolate, instanceTemplate, prototypeTemplate, interfaceTemplate, signature, attribute, method, world);
	}

	void V8DOMConfiguration::installMethod(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> prototypeTemplate, v8::Local<v8::Signature> signature, v8::PropertyAttribute attribute, const SymbolKeyedMethodConfiguration& method)
	{
	const DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
	installMethodInternal(isolate, v8::Local<v8::ObjectTemplate>(), prototypeTemplate, v8::Local<v8::FunctionTemplate>(), signature, attribute, method, world);
	}

	v8::Local<v8::Signature> V8DOMConfiguration::installDOMClassTemplate(v8::Isolate* isolate, v8::Local<v8::FunctionTemplate> functionDescriptor, const char* interfaceName, v8::Local<v8::FunctionTemplate> parentClass, size_t fieldCount,
	const AttributeConfiguration* attributes, size_t attributeCount,
	const AccessorConfiguration* accessors, size_t accessorCount,
	const MethodConfiguration* methods, size_t methodCount)
	{
	functionDescriptor->SetClassName(v8AtomicString(isolate, interfaceName));
	v8::Local<v8::ObjectTemplate> instanceTemplate = functionDescriptor->InstanceTemplate();
	v8::Local<v8::ObjectTemplate> prototypeTemplate = functionDescriptor->PrototypeTemplate();
	instanceTemplate->SetInternalFieldCount(fieldCount);
	if (!parentClass.IsEmpty()) {
	functionDescriptor->Inherit(parentClass);
	// Marks the prototype object as one of native-backed objects.
	// This is needed since bug 110436 asks WebKit to tell native-initiated prototypes from pure-JS ones.
	// This doesn't mark kinds "root" classes like Node, where setting this changes prototype chain structure.
	prototypeTemplate->SetInternalFieldCount(v8PrototypeInternalFieldcount);
	}

	v8::Local<v8::Signature> defaultSignature = v8::Signature::New(isolate, functionDescriptor);
	if (attributeCount)
	installAttributes(isolate, instanceTemplate, prototypeTemplate, attributes, attributeCount);
	if (accessorCount)
	installAccessors(isolate, instanceTemplate, prototypeTemplate, functionDescriptor, defaultSignature, accessors, accessorCount);
	if (methodCount)
	installMethods(isolate, instanceTemplate, prototypeTemplate, functionDescriptor, defaultSignature, static_cast<v8::PropertyAttribute>(v8::None), methods, methodCount);
	return defaultSignature;
	}

	v8::Local<v8::FunctionTemplate> V8DOMConfiguration::domClassTemplate(v8::Isolate* isolate, WrapperTypeInfo* wrapperTypeInfo, void (configureDOMClassTemplate)(v8::Local<v8::FunctionTemplate>, v8::Isolate))
	{
	V8PerIsolateData* data = V8PerIsolateData::from(isolate);
	v8::Local<v8::FunctionTemplate> result = data->existingDOMTemplate(wrapperTypeInfo);
	if (!result.IsEmpty())
	return result;

	TRACE_EVENT_SCOPED_SAMPLING_STATE("blink", "BuildDOMTemplate");
	result = v8::FunctionTemplate::New(isolate, V8ObjectConstructor::isValidConstructorMode);
	configureDOMClassTemplate(result, isolate);
	data->setDOMTemplate(wrapperTypeInfo, result);
	return result;
	}

	} // namespace blink