IDL: make optional arguments (without default) explicit sometimes

Source/bindings/tests/results/V8TestInterfaceConstructor.cpp

Index: Source/bindings/tests/results/V8TestInterfaceConstructor.cpp
diff --git a/Source/bindings/tests/results/V8TestInterfaceConstructor.cpp b/Source/bindings/tests/results/V8TestInterfaceConstructor.cpp
index 163291c2fcf623ca326e127ef9ea70943fe4aefc..5adf3f7cc743144aa3a2f3e7f1b5802efb6d7a3a 100644
--- a/Source/bindings/tests/results/V8TestInterfaceConstructor.cpp
+++ b/Source/bindings/tests/results/V8TestInterfaceConstructor.cpp
@@ -72,6 +72,7 @@ static void constructor2(const v8::FunctionCallbackInfo<v8::Value>& info)
     Vector<String> sequenceStringArg;
     Vector<Dictionary> sequenceDictionaryArg;
     Dictionary optionalDictionaryArg;
+    bool optionalDictionaryArgMissing = false;

[Jens Widell, 2014/06/17 09:53:37]

The code generated here is not correct; this new local is set but never used,
for instance. My new logic interacts poorly with either Dictionary special
casing, or [Default=Undefined], I think.

     TestInterfaceEmpty* optionalTestInterfaceEmptyArg;
     {
         v8::TryCatch block;
@@ -87,11 +88,15 @@ static void constructor2(const v8::FunctionCallbackInfo<v8::Value>& info)
         }
         TONATIVE_VOID_INTERNAL(sequenceStringArg, toNativeArray<String>(info[4], 5, info.GetIsolate()));
         TONATIVE_VOID_INTERNAL(sequenceDictionaryArg, toNativeArray<Dictionary>(info[5], 6, info.GetIsolate()));
-        TONATIVE_VOID_INTERNAL(optionalDictionaryArg, Dictionary(info[6], info.GetIsolate()));
-        if (!optionalDictionaryArg.isUndefinedOrNull() && !optionalDictionaryArg.isObject()) {
-            exceptionState.throwTypeError("parameter 7 ('optionalDictionaryArg') is not an object.");
-            exceptionState.throwIfNeeded();
-            return;
+        if (info.Length() > 6) {
+            TONATIVE_VOID_INTERNAL(optionalDictionaryArg, Dictionary(info[6], info.GetIsolate()));
+            if (!optionalDictionaryArg.isUndefinedOrNull() && !optionalDictionaryArg.isObject()) {
+                exceptionState.throwTypeError("parameter 7 ('optionalDictionaryArg') is not an object.");
+                exceptionState.throwIfNeeded();
+                return;
+            }
+        } else {
+            optionalDictionaryArgMissing = true;
         }
         TONATIVE_VOID_INTERNAL(optionalTestInterfaceEmptyArg, V8TestInterfaceEmpty::toNativeWithTypeCheck(info.GetIsolate(), info[7]));
     }