Create fewer local v8::TryCatch objects in generated bindings code

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 c5ff0e3334e3b85d96189638fe5f226cbfc3a8e8..b74863c567c1fd5a47185d5b6edec4b2c38920e6 100644
--- a/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
+++ b/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
@@ -48,7 +48,10 @@ template <typename T> void V8_USE(T) { }
 static void constructor1(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     v8::Isolate* isolate = info.GetIsolate();
-    TOSTRING_VOID(V8StringResource<>, stringArg, info[0]);
+    V8StringResource<> stringArg;
+    {
+        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+    }
     RefPtr<TestInterfaceConstructor2> impl = TestInterfaceConstructor2::create(stringArg);
 
     v8::Handle<v8::Object> wrapper = info.Holder();
@@ -59,10 +62,15 @@ static void constructor1(const v8::FunctionCallbackInfo<v8::Value>& info)
 static void constructor2(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     v8::Isolate* isolate = info.GetIsolate();
-    TONATIVE_VOID(Dictionary, dictionaryArg, Dictionary(info[0], info.GetIsolate()));
-    if (!dictionaryArg.isUndefinedOrNull() && !dictionaryArg.isObject()) {
-        throwTypeError(ExceptionMessages::failedToConstruct("TestInterfaceConstructor2", "parameter 1 ('dictionaryArg') is not an object."), info.GetIsolate());
-        return;
+    Dictionary dictionaryArg;
+    {
+        v8::TryCatch block;
+        TONATIVE_VOID_INTERNAL(dictionaryArg, Dictionary(info[0], info.GetIsolate()));
+        if (!dictionaryArg.isUndefinedOrNull() && !dictionaryArg.isObject()) {
+            throwTypeError(ExceptionMessages::failedToConstruct("TestInterfaceConstructor2", "parameter 1 ('dictionaryArg') is not an object."), info.GetIsolate());
+            block.ReThrow();
+            return;
+        }
     }
     RefPtr<TestInterfaceConstructor2> impl = TestInterfaceConstructor2::create(dictionaryArg);
 
@@ -75,24 +83,34 @@ static void constructor3(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     v8::Isolate* isolate = info.GetIsolate();
     ExceptionState exceptionState(ExceptionState::ConstructionContext, "TestInterfaceConstructor2", info.Holder(), isolate);
-    TONATIVE_VOID(TestInterfaceEmpty*, testInterfaceEmptyArg, V8TestInterfaceEmpty::toNativeWithTypeCheck(info.GetIsolate(), info[0]));
-    TONATIVE_VOID_EXCEPTIONSTATE(int, longArg, toInt32(info[1], exceptionState), exceptionState);
-    TOSTRING_VOID(V8StringResource<>, defaultUndefinedOptionalStringArg, info[2]);
-    TOSTRING_VOID(V8StringResource<>, defaultNullStringOptionalStringArg, argumentOrNull(info, 3));
-    TONATIVE_VOID(Dictionary, defaultUndefinedOptionalDictionaryArg, Dictionary(info[4], info.GetIsolate()));
-    if (!defaultUndefinedOptionalDictionaryArg.isUndefinedOrNull() && !defaultUndefinedOptionalDictionaryArg.isObject()) {
-        exceptionState.throwTypeError("parameter 5 ('defaultUndefinedOptionalDictionaryArg') is not an object.");
-        exceptionState.throwIfNeeded();
-        return;
-    }
-    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, isolate, WrapperConfiguration::Independent);
-        v8SetReturnValue(info, wrapper);
-        return;
+    TestInterfaceEmpty* testInterfaceEmptyArg;
+    int longArg;
+    V8StringResource<> defaultUndefinedOptionalStringArg;
+    V8StringResource<> defaultNullStringOptionalStringArg;
+    Dictionary defaultUndefinedOptionalDictionaryArg;
+    V8StringResource<> optionalStringArg;
+    {
+        v8::TryCatch block;
+        TONATIVE_VOID_INTERNAL(testInterfaceEmptyArg, V8TestInterfaceEmpty::toNativeWithTypeCheck(info.GetIsolate(), info[0]));
+        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[1], exceptionState), exceptionState);
+        TOSTRING_VOID_INTERNAL_RETHROW(defaultUndefinedOptionalStringArg, info[2], block);
+        TOSTRING_VOID_INTERNAL_RETHROW(defaultNullStringOptionalStringArg, argumentOrNull(info, 3), block);
+        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();
+            block.ReThrow();
+            return;
+        }
+        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, isolate, WrapperConfiguration::Independent);
+            v8SetReturnValue(info, wrapper);
+            return;
+        }
+        TOSTRING_VOID_INTERNAL_RETHROW(optionalStringArg, info[5], block);
     }
-    TOSTRING_VOID(V8StringResource<>, optionalStringArg, info[5]);
     RefPtr<TestInterfaceConstructor2> impl = TestInterfaceConstructor2::create(testInterfaceEmptyArg, longArg, defaultUndefinedOptionalStringArg, defaultNullStringOptionalStringArg, defaultUndefinedOptionalDictionaryArg, optionalStringArg);
 
     v8::Handle<v8::Object> wrapper = info.Holder();