IDL: Simplify [TypeChecking=Interface] code generation

Source/bindings/tests/results/modules/V8TestInterface5.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by code_generator_v8.py. DO NOT MODIFY!
 
 #include "config.h"
 #if ENABLE(CONDITION)
 #include "V8TestInterface5.h"
 
@@ skipping 34 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestInterface5ImplementationV8Internal::testInterfaceAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void testInterfaceAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Handle<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "testInterfaceAttribute", "TestInterface5", holder, info.GetIsolate());
-    if (!V8TestInterface5::hasInstance(v8Value, info.GetIsolate())) {
+    TestInterface5Implementation* impl = V8TestInterface5::toImpl(holder);
+    TestInterface5Implementation* cppValue = V8TestInterface5::toImplWithTypeCheck(info.GetIsolate(), v8Value);
+    if (!cppValue) {
         exceptionState.throwTypeError("The provided value is not of type 'TestInterface5'.");
         exceptionState.throwIfNeeded();
         return;
     }
-    TestInterface5Implementation* impl = V8TestInterface5::toImpl(holder);
-    TestInterface5Implementation* cppValue = V8TestInterface5::toImpl(v8::Handle<v8::Object>::Cast(v8Value));
     impl->setTestInterfaceAttribute(WTF::getPtr(cppValue));
 }
 
 static void testInterfaceAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestInterface5ImplementationV8Internal::testInterfaceAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 265 matching lines @@
 
 static void voidMethodTestInterfaceEmptyArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "voidMethodTestInterfaceEmptyArg", "TestInterface5", 1, info.Length()), info.GetIsolate());
         return;
     }
     TestInterface5Implementation* impl = V8TestInterface5::toImpl(info.Holder());
     TestInterfaceEmpty* testInterfaceEmptyArg;
     {
-        if (info.Length() > 0 && !V8TestInterfaceEmpty::hasInstance(info[0], info.GetIsolate())) {
+        testInterfaceEmptyArg = V8TestInterfaceEmpty::toImplWithTypeCheck(info.GetIsolate(), info[0]);
+        if (!testInterfaceEmptyArg) {
             V8ThrowException::throwTypeError(info.GetIsolate(), ExceptionMessages::failedToExecute("voidMethodTestInterfaceEmptyArg", "TestInterface5", "parameter 1 is not of type 'TestInterfaceEmpty'."));
             return;
         }
-        testInterfaceEmptyArg = V8TestInterfaceEmpty::toImpl(v8::Handle<v8::Object>::Cast(info[0]));
     }
     impl->voidMethodTestInterfaceEmptyArg(testInterfaceEmptyArg);
 }
 
 static void voidMethodTestInterfaceEmptyArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestInterface5ImplementationV8Internal::voidMethodTestInterfaceEmptyArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 516 matching lines @@
     scriptWrappable->toImpl<TestInterface5Implementation>()->ref();
 }
 
 void V8TestInterface5::derefObject(ScriptWrappable* scriptWrappable)
 {
     scriptWrappable->toImpl<TestInterface5Implementation>()->deref();
 }
 
 } // namespace blink
 #endif // ENABLE(CONDITION)