IDL: make optional arguments (without default) explicit sometimes

Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp

Index: Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
diff --git a/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp b/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
index 6077e0bfa04f04d67923cbf6d3b64fc582c6f468..4018011586f9be87d24ce549ef3b6c30b6a97dc4 100644
--- a/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
+++ b/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
@@ -9,6 +9,7 @@
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/Optional.h"
 #include "bindings/core/v8/V8DOMConfiguration.h"
 #include "bindings/core/v8/V8HiddenValue.h"
 #include "bindings/core/v8/V8ObjectConstructor.h"
@@ -81,36 +82,44 @@ static void constructor3(const v8::FunctionCallbackInfo<v8::Value>& info)
     TestInterfaceEmpty* testInterfaceEmptyArg;
     int longArg;
     V8StringResource<> defaultUndefinedOptionalStringArg;
+    bool defaultUndefinedOptionalStringArgMissing = false;
     V8StringResource<> defaultNullStringOptionalStringArg;
     Dictionary defaultUndefinedOptionalDictionaryArg;
+    bool defaultUndefinedOptionalDictionaryArgMissing = false;
     V8StringResource<> optionalStringArg;
+    bool optionalStringArgMissing = false;
     {
         v8::TryCatch block;
         V8RethrowTryCatchScope rethrow(block);
         TONATIVE_VOID_INTERNAL(testInterfaceEmptyArg, V8TestInterfaceEmpty::toNativeWithTypeCheck(info.GetIsolate(), info[0]));
         TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[1], exceptionState), exceptionState);
-        TOSTRING_VOID_INTERNAL(defaultUndefinedOptionalStringArg, info[2]);
+        if (!info[2]->IsUndefined()) {
+            TOSTRING_VOID_INTERNAL(defaultUndefinedOptionalStringArg, info[2]);
+        } else {
+            defaultUndefinedOptionalStringArgMissing = true;
+        }
         if (!info[3]->IsUndefined()) {
             TOSTRING_VOID_INTERNAL(defaultNullStringOptionalStringArg, info[3]);
         } else {
             defaultNullStringOptionalStringArg = nullptr;
         }
-        TONATIVE_VOID_INTERNAL(defaultUndefinedOptionalDictionaryArg, Dictionary(info[4], info.GetIsolate()));
-        if (!defaultUndefinedOptionalDictionaryArg.isUndefinedOrNull() && !defaultUndefinedOptionalDictionaryArg.isObject()) {
-            exceptionState.throwTypeError("parameter 5 ('defaultUndefinedOptionalDictionaryArg') is not an object.");
-            exceptionState.throwIfNeeded();
-            return;
+        if (!info[4]->IsUndefined()) {
+            TONATIVE_VOID_INTERNAL(defaultUndefinedOptionalDictionaryArg, Dictionary(info[4], info.GetIsolate()));
+            if (!defaultUndefinedOptionalDictionaryArg.isUndefinedOrNull() && !defaultUndefinedOptionalDictionaryArg.isObject()) {
+                exceptionState.throwTypeError("parameter 5 ('defaultUndefinedOptionalDictionaryArg') is not an object.");
+                exceptionState.throwIfNeeded();
+                return;
+            }
+        } else {
+            defaultUndefinedOptionalDictionaryArgMissing = true;
         }
-        if (UNLIKELY(info.Length() <= 5)) {
-            RefPtr<TestInterfaceConstructor2> impl = TestInterfaceConstructor2::create(testInterfaceEmptyArg, longArg, defaultUndefinedOptionalStringArg, defaultNullStringOptionalStringArg, defaultUndefinedOptionalDictionaryArg);
-            v8::Handle<v8::Object> wrapper = info.Holder();
-            V8DOMWrapper::associateObjectWithWrapper<V8TestInterfaceConstructor2>(impl.release(), &V8TestInterfaceConstructor2::wrapperTypeInfo, wrapper, info.GetIsolate(), WrapperConfiguration::Independent);
-            v8SetReturnValue(info, wrapper);
-            return;
+        if (!info[5]->IsUndefined()) {
+            TOSTRING_VOID_INTERNAL(optionalStringArg, info[5]);
+        } else {
+            optionalStringArgMissing = true;
         }
-        TOSTRING_VOID_INTERNAL(optionalStringArg, info[5]);
     }
-    RefPtr<TestInterfaceConstructor2> impl = TestInterfaceConstructor2::create(testInterfaceEmptyArg, longArg, defaultUndefinedOptionalStringArg, defaultNullStringOptionalStringArg, defaultUndefinedOptionalDictionaryArg, optionalStringArg);
+    RefPtr<TestInterfaceConstructor2> impl = TestInterfaceConstructor2::create(testInterfaceEmptyArg, longArg, Optional<V8StringResource<> >(defaultUndefinedOptionalStringArg, defaultUndefinedOptionalStringArgMissing), defaultNullStringOptionalStringArg, Optional<Dictionary>(defaultUndefinedOptionalDictionaryArg, defaultUndefinedOptionalDictionaryArgMissing), Optional<V8StringResource<> >(optionalStringArg, optionalStringArgMissing));
     v8::Handle<v8::Object> wrapper = info.Holder();
     V8DOMWrapper::associateObjectWithWrapper<V8TestInterfaceConstructor2>(impl.release(), &V8TestInterfaceConstructor2::wrapperTypeInfo, wrapper, info.GetIsolate(), WrapperConfiguration::Independent);
     v8SetReturnValue(info, wrapper);