IDL: Drop value conversion (V8 -> C++) macros from generated code

Source/bindings/tests/results/core/V8TestObject.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"
 #include "V8TestObject.h"
 
 #include "bindings/core/v8/BindingSecurity.h"
@@ skipping 97 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::stringifierAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void stringifierAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setStringifierAttribute(cppValue);
 }
 
 static void stringifierAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::stringifierAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 86 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::stringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void stringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setStringAttribute(cppValue);
 }
 
 static void stringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::stringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void byteStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueString(info, impl->byteStringAttribute(), info.GetIsolate());
 }
 
 static void byteStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::byteStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void byteStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "byteStringAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(V8StringResource<>, cppValue, toByteString(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, convertAndThrow(cppValue = toByteString(v8Value, exceptionState), exceptionState), return);
     impl->setByteStringAttribute(cppValue);
 }
 
 static void byteStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::byteStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void usvStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueString(info, impl->usvStringAttribute(), info.GetIsolate());
 }
 
 static void usvStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::usvStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void usvStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "usvStringAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(V8StringResource<>, cppValue, toUSVString(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, convertAndThrow(cppValue = toUSVString(v8Value, exceptionState), exceptionState), return);
     impl->setUsvStringAttribute(cppValue);
 }
 
 static void usvStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::usvStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void domTimeStampAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, static_cast<double>(impl->domTimeStampAttribute()));
 }
 
 static void domTimeStampAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::domTimeStampAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void domTimeStampAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "domTimeStampAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(unsigned long long, cppValue, toUInt64(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(unsigned long long, cppValue, convertAndThrow(cppValue = toUInt64(v8Value, exceptionState), exceptionState), return);
     impl->setDomTimeStampAttribute(cppValue);
 }
 
 static void domTimeStampAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::domTimeStampAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 38 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::byteAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void byteAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "byteAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt8(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt8(v8Value, exceptionState), exceptionState), return);
     impl->setByteAttribute(cppValue);
 }
 
 static void byteAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::byteAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void doubleAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, impl->doubleAttribute());
 }
 
 static void doubleAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::doubleAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void doubleAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "doubleAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(double, cppValue, toDouble(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(double, cppValue, convertAndThrow(cppValue = toDouble(v8Value, exceptionState), exceptionState), return);
     impl->setDoubleAttribute(cppValue);
 }
 
 static void doubleAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::doubleAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void floatAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, impl->floatAttribute());
 }
 
 static void floatAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::floatAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void floatAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "floatAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(float, cppValue, toFloat(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(float, cppValue, convertAndThrow(cppValue = toFloat(v8Value, exceptionState), exceptionState), return);
     impl->setFloatAttribute(cppValue);
 }
 
 static void floatAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::floatAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void longAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->longAttribute());
 }
 
 static void longAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::longAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void longAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "longAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setLongAttribute(cppValue);
 }
 
 static void longAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::longAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void longLongAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, static_cast<double>(impl->longLongAttribute()));
 }
 
 static void longLongAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::longLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void longLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "longLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(long long, cppValue, toInt64(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(long long, cppValue, convertAndThrow(cppValue = toInt64(v8Value, exceptionState), exceptionState), return);
     impl->setLongLongAttribute(cppValue);
 }
 
 static void longLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::longLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void octetAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueUnsigned(info, impl->octetAttribute());
 }
 
 static void octetAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::octetAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void octetAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "octetAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(unsigned, cppValue, toUInt8(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(unsigned, cppValue, convertAndThrow(cppValue = toUInt8(v8Value, exceptionState), exceptionState), return);
     impl->setOctetAttribute(cppValue);
 }
 
 static void octetAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::octetAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void shortAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->shortAttribute());
 }
 
 static void shortAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::shortAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void shortAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "shortAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt16(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt16(v8Value, exceptionState), exceptionState), return);
     impl->setShortAttribute(cppValue);
 }
 
 static void shortAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::shortAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unrestrictedDoubleAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, impl->unrestrictedDoubleAttribute());
 }
 
 static void unrestrictedDoubleAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::unrestrictedDoubleAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unrestrictedDoubleAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "unrestrictedDoubleAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(double, cppValue, toDouble(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(double, cppValue, convertAndThrow(cppValue = toDouble(v8Value, exceptionState), exceptionState), return);
     impl->setUnrestrictedDoubleAttribute(cppValue);
 }
 
 static void unrestrictedDoubleAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::unrestrictedDoubleAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unrestrictedFloatAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, impl->unrestrictedFloatAttribute());
 }
 
 static void unrestrictedFloatAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::unrestrictedFloatAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unrestrictedFloatAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "unrestrictedFloatAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(float, cppValue, toFloat(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(float, cppValue, convertAndThrow(cppValue = toFloat(v8Value, exceptionState), exceptionState), return);
     impl->setUnrestrictedFloatAttribute(cppValue);
 }
 
 static void unrestrictedFloatAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::unrestrictedFloatAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unsignedLongAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueUnsigned(info, impl->unsignedLongAttribute());
 }
 
 static void unsignedLongAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::unsignedLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unsignedLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "unsignedLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(unsigned, cppValue, toUInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(unsigned, cppValue, convertAndThrow(cppValue = toUInt32(v8Value, exceptionState), exceptionState), return);
     impl->setUnsignedLongAttribute(cppValue);
 }
 
 static void unsignedLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::unsignedLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unsignedLongLongAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, static_cast<double>(impl->unsignedLongLongAttribute()));
 }
 
 static void unsignedLongLongAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::unsignedLongLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unsignedLongLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "unsignedLongLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(unsigned long long, cppValue, toUInt64(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(unsigned long long, cppValue, convertAndThrow(cppValue = toUInt64(v8Value, exceptionState), exceptionState), return);
     impl->setUnsignedLongLongAttribute(cppValue);
 }
 
 static void unsignedLongLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::unsignedLongLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unsignedShortAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueUnsigned(info, impl->unsignedShortAttribute());
 }
 
 static void unsignedShortAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::unsignedShortAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unsignedShortAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "unsignedShortAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(unsigned, cppValue, toUInt16(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(unsigned, cppValue, convertAndThrow(cppValue = toUInt16(v8Value, exceptionState), exceptionState), return);
     impl->setUnsignedShortAttribute(cppValue);
 }
 
 static void unsignedShortAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::unsignedShortAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 125 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::cssAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void cssAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "cssAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setCSSAttribute(cppValue);
 }
 
 static void cssAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::cssAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void imeAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->imeAttribute());
 }
 
 static void imeAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::imeAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void imeAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "imeAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setIMEAttribute(cppValue);
 }
 
 static void imeAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::imeAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void svgAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->svgAttribute());
 }
 
 static void svgAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::svgAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void svgAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "svgAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setSVGAttribute(cppValue);
 }
 
 static void svgAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::svgAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void xmlAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->xmlAttribute());
 }
 
 static void xmlAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::xmlAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void xmlAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "xmlAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setXMLAttribute(cppValue);
 }
 
 static void xmlAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::xmlAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 38 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::serializedScriptValueAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void serializedScriptValueAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "serializedScriptValueAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(RefPtr<SerializedScriptValue>, cppValue, SerializedScriptValueFactory::instance().create(v8Value, 0, 0, exceptionState, info.GetIsolate()), exceptionState);
+    TONATIVE_DECLARE(RefPtr<SerializedScriptValue>, cppValue, convertAndThrow(cppValue = SerializedScriptValueFactory::instance().create(v8Value, 0, 0, exceptionState, info.GetIsolate()), exceptionState), return);
     impl->setSerializedScriptValueAttribute(WTF::getPtr(cppValue));
 }
 
 static void serializedScriptValueAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::serializedScriptValueAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 441 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::stringArrayAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void stringArrayAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "stringArrayAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(Vector<String>, cppValue, toImplArray<String>(v8Value, 0, info.GetIsolate(), exceptionState), exceptionState);
+    TONATIVE_DECLARE(Vector<String>, cppValue, convertAndThrow(cppValue = toImplArray<String>(v8Value, 0, info.GetIsolate(), exceptionState), exceptionState), return);
     impl->setStringArrayAttribute(cppValue);
 }
 
 static void stringArrayAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::stringArrayAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void testInterfaceEmptyArrayAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, toV8(impl->testInterfaceEmptyArrayAttribute(), info.Holder(), info.GetIsolate()));
 }
 
 static void testInterfaceEmptyArrayAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::testInterfaceEmptyArrayAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void testInterfaceEmptyArrayAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "testInterfaceEmptyArrayAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(Vector<RefPtr<TestInterfaceEmpty>>, cppValue, (toRefPtrNativeArray<TestInterfaceEmpty, V8TestInterfaceEmpty>(v8Value, 0, info.GetIsolate(), exceptionState)), exceptionState);
+    TONATIVE_DECLARE(Vector<RefPtr<TestInterfaceEmpty>>, cppValue, convertAndThrow(cppValue = (toRefPtrNativeArray<TestInterfaceEmpty, V8TestInterfaceEmpty>(v8Value, 0, info.GetIsolate(), exceptionState)), exceptionState), return);
     impl->setTestInterfaceEmptyArrayAttribute(cppValue);
 }
 
 static void testInterfaceEmptyArrayAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::testInterfaceEmptyArrayAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void floatArrayAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, toV8(impl->floatArrayAttribute(), info.Holder(), info.GetIsolate()));
 }
 
 static void floatArrayAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::floatArrayAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void floatArrayAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "floatArrayAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(Vector<float>, cppValue, toImplArray<float>(v8Value, 0, info.GetIsolate(), exceptionState), exceptionState);
+    TONATIVE_DECLARE(Vector<float>, cppValue, convertAndThrow(cppValue = toImplArray<float>(v8Value, 0, info.GetIsolate(), exceptionState), exceptionState), return);
     impl->setFloatArrayAttribute(cppValue);
 }
 
 static void floatArrayAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::floatArrayAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void stringOrNullAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueStringOrNull(info, impl->stringOrNullAttribute(), info.GetIsolate());
 }
 
 static void stringOrNullAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::stringOrNullAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void stringOrNullAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<TreatNullAsNullString>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setStringOrNullAttribute(cppValue);
 }
 
 static void stringOrNullAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::stringOrNullAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 15 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::longOrNullAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void longOrNullAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "longOrNullAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setLongOrNullAttribute(cppValue);
 }
 
 static void longOrNullAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::longOrNullAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 37 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::testEnumAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void testEnumAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     String string = cppValue;
     if (!(string == "" || string == "EnumValue1" || string == "EnumValue2" || string == "EnumValue3"))
         return;
     impl->setTestEnumAttribute(cppValue);
 }
 
 static void testEnumAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::testEnumAttributeAttributeSetter(v8Value, info);
@@ skipping 11 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::testEnumOrNullAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void testEnumOrNullAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<TreatNullAsNullString>, cppValue, (cppValue = v8Value).prepare(), return);
     String string = cppValue;
     if (!(string == "" || string == "EnumValue1" || string == "EnumValue2" || string == "EnumValue3"))
         return;
     impl->setTestEnumOrNullAttribute(cppValue);
 }
 
 static void testEnumOrNullAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::testEnumOrNullAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void staticStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8SetReturnValueString(info, TestObject::staticStringAttribute(), info.GetIsolate());
 }
 
 static void staticStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::staticStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void staticStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     TestObject::setStaticStringAttribute(cppValue);
 }
 
 static void staticStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::staticStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void staticLongAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8SetReturnValueInt(info, TestObject::staticLongAttribute());
 }
 
 static void staticLongAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::staticLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void staticLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     ExceptionState exceptionState(ExceptionState::SetterContext, "staticLongAttribute", "TestObject", holder, info.GetIsolate());
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     TestObject::setStaticLongAttribute(cppValue);
 }
 
 static void staticLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::staticLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 40 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::doubleOrStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void doubleOrStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "doubleOrStringAttribute", "TestObject", holder, info.GetIsolate());
-    DoubleOrString cppValue;
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8DoubleOrString::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), exceptionState);
+    TONATIVE_DECLARE(DoubleOrString, cppValue, V8DoubleOrString::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), return exceptionState.throwException());
     impl->setDoubleOrStringAttribute(cppValue);
 }
 
 static void doubleOrStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::doubleOrStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::doubleOrStringOrNullAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void doubleOrStringOrNullAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "doubleOrStringOrNullAttribute", "TestObject", holder, info.GetIsolate());
-    DoubleOrString cppValue;
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), exceptionState);
+    TONATIVE_DECLARE(DoubleOrString, cppValue, V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), return exceptionState.throwException());
     impl->setDoubleOrStringOrNullAttribute(cppValue);
 }
 
 static void doubleOrStringOrNullAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::doubleOrStringOrNullAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::doubleOrNullStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void doubleOrNullStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "doubleOrNullStringAttribute", "TestObject", holder, info.GetIsolate());
-    DoubleOrString cppValue;
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), exceptionState);
+    TONATIVE_DECLARE(DoubleOrString, cppValue, V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), return exceptionState.throwException());
     impl->setDoubleOrNullStringAttribute(cppValue);
 }
 
 static void doubleOrNullStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::doubleOrNullStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::stringOrStringSequenceAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void stringOrStringSequenceAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "stringOrStringSequenceAttribute", "TestObject", holder, info.GetIsolate());
-    StringOrStringSequence cppValue;
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8StringOrStringSequence::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), exceptionState);
+    TONATIVE_DECLARE(StringOrStringSequence, cppValue, V8StringOrStringSequence::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), return exceptionState.throwException());
     impl->setStringOrStringSequenceAttribute(cppValue);
 }
 
 static void stringOrStringSequenceAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::stringOrStringSequenceAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::testEnumOrDoubleAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void testEnumOrDoubleAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "testEnumOrDoubleAttribute", "TestObject", holder, info.GetIsolate());
-    TestEnumOrDouble cppValue;
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8TestEnumOrDouble::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), exceptionState);
+    TONATIVE_DECLARE(TestEnumOrDouble, cppValue, V8TestEnumOrDouble::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), return exceptionState.throwException());
     impl->setTestEnumOrDoubleAttribute(cppValue);
 }
 
 static void testEnumOrDoubleAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::testEnumOrDoubleAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::unrestrictedDoubleOrStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unrestrictedDoubleOrStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "unrestrictedDoubleOrStringAttribute", "TestObject", holder, info.GetIsolate());
-    UnrestrictedDoubleOrString cppValue;
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8UnrestrictedDoubleOrString::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), exceptionState);
+    TONATIVE_DECLARE(UnrestrictedDoubleOrString, cppValue, V8UnrestrictedDoubleOrString::toImpl(info.GetIsolate(), v8Value, cppValue, exceptionState), return exceptionState.throwException());
     impl->setUnrestrictedDoubleOrStringAttribute(cppValue);
 }
 
 static void unrestrictedDoubleOrStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::unrestrictedDoubleOrStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 13 matching lines @@
         contextData->activityLogger()->logGetter("TestObject.activityLoggingAccessForAllWorldsLongAttribute");
     TestObjectV8Internal::activityLoggingAccessForAllWorldsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingAccessForAllWorldsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingAccessForAllWorldsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingAccessForAllWorldsLongAttribute(cppValue);
 }
 
 static void activityLoggingAccessForAllWorldsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     ScriptState* scriptState = ScriptState::from(info.GetIsolate()->GetCurrentContext());
     V8PerContextData* contextData = scriptState->perContextData();
     if (contextData && contextData->activityLogger()) {
         contextData->activityLogger()->logSetter("TestObject.activityLoggingAccessForAllWorldsLongAttribute", v8Value);
@@ skipping 18 matching lines @@
         contextData->activityLogger()->logGetter("TestObject.activityLoggingGetterForAllWorldsLongAttribute");
     TestObjectV8Internal::activityLoggingGetterForAllWorldsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingGetterForAllWorldsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingGetterForAllWorldsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingGetterForAllWorldsLongAttribute(cppValue);
 }
 
 static void activityLoggingGetterForAllWorldsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::activityLoggingGetterForAllWorldsLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingSetterForAllWorldsLongAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->activityLoggingSetterForAllWorldsLongAttribute());
 }
 
 static void activityLoggingSetterForAllWorldsLongAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::activityLoggingSetterForAllWorldsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingSetterForAllWorldsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingSetterForAllWorldsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingSetterForAllWorldsLongAttribute(cppValue);
 }
 
 static void activityLoggingSetterForAllWorldsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     ScriptState* scriptState = ScriptState::from(info.GetIsolate()->GetCurrentContext());
     V8PerContextData* contextData = scriptState->perContextData();
     if (contextData && contextData->activityLogger()) {
         contextData->activityLogger()->logSetter("TestObject.activityLoggingSetterForAllWorldsLongAttribute", v8Value);
@@ skipping 64 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::cachedArrayAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void cachedArrayAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "cachedArrayAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(Vector<String>, cppValue, toImplArray<String>(v8Value, 0, info.GetIsolate(), exceptionState), exceptionState);
+    TONATIVE_DECLARE(Vector<String>, cppValue, convertAndThrow(cppValue = toImplArray<String>(v8Value, 0, info.GetIsolate(), exceptionState), exceptionState), return);
     impl->setCachedArrayAttribute(cppValue);
     V8HiddenValue::deleteHiddenValue(info.GetIsolate(), holder, v8AtomicString(info.GetIsolate(), "cachedArrayAttribute")); // Invalidate the cached value.
 }
 
 static void cachedArrayAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::cachedArrayAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 19 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::cachedStringOrNoneAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void cachedStringOrNoneAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<TreatNullAsNullString>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setCachedStringOrNoneAttribute(cppValue);
     V8HiddenValue::deleteHiddenValue(info.GetIsolate(), holder, v8AtomicString(info.GetIsolate(), "cachedStringOrNoneAttribute")); // Invalidate the cached value.
 }
 
 static void cachedStringOrNoneAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::cachedStringOrNoneAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 128 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 #endif // ENABLE(CONDITION)
 
 #if ENABLE(CONDITION)
 static void conditionalLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "conditionalLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setConditionalLongAttribute(cppValue);
 }
 #endif // ENABLE(CONDITION)
 
 #if ENABLE(CONDITION)
 static void conditionalLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::conditionalLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 19 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     V8TestObject::customGetterLongAttributeAttributeGetterCustom(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void customGetterLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "customGetterLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setCustomGetterLongAttribute(cppValue);
 }
 
 static void customGetterLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::customGetterLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 70 matching lines @@
     UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::LongAttribute);
     TestObjectV8Internal::deprecatedLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void deprecatedLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "deprecatedLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setDeprecatedLongAttribute(cppValue);
 }
 
 static void deprecatedLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::LongAttribute);
     TestObjectV8Internal::deprecatedLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 10 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::enforceRangeLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void enforceRangeLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "enforceRangeLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, EnforceRange, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, EnforceRange, exceptionState), exceptionState), return);
     impl->setEnforceRangeLongAttribute(cppValue);
 }
 
 static void enforceRangeLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::enforceRangeLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void exposeJSAccessorsLongAttributeAttributeGetter(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->exposeJSAccessorsLongAttribute());
 }
 
 static void exposeJSAccessorsLongAttributeAttributeGetterCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::exposeJSAccessorsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void exposeJSAccessorsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "exposeJSAccessorsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setExposeJSAccessorsLongAttribute(cppValue);
 }
 
 static void exposeJSAccessorsLongAttributeAttributeSetterCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Value> v8Value = info[0];
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::exposeJSAccessorsLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 10 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::implementedAsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void implementedAsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "implementedAsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setImplementedAsName(cppValue);
 }
 
 static void implementedAsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::implementedAsLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 16 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     V8TestObject::customGetterImplementedAsLongAttributeAttributeGetterCustom(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void customGetterImplementedAsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "customGetterImplementedAsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setImplementedAsNameWithCustomGetter(cppValue);
 }
 
 static void customGetterImplementedAsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::customGetterImplementedAsLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 31 matching lines @@
     UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeature);
     TestObjectV8Internal::measureAsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void measureAsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "measureAsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setMeasureAsLongAttribute(cppValue);
 }
 
 static void measureAsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeature);
     TestObjectV8Internal::measureAsLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 10 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::notEnumerableLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void notEnumerableLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "notEnumerableLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setNotEnumerableLongAttribute(cppValue);
 }
 
 static void notEnumerableLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::notEnumerableLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void perContextEnabledLongAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->perContextEnabledLongAttribute());
 }
 
 static void perContextEnabledLongAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::perContextEnabledLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void perContextEnabledLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "perContextEnabledLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setPerContextEnabledLongAttribute(cppValue);
 }
 
 static void perContextEnabledLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::perContextEnabledLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 55 matching lines @@
         contextData->activityLogger()->logGetter("TestObject.activityLoggingAccessPerWorldBindingsLongAttribute");
     TestObjectV8Internal::activityLoggingAccessPerWorldBindingsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingAccessPerWorldBindingsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingAccessPerWorldBindingsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingAccessPerWorldBindingsLongAttribute(cppValue);
 }
 
 static void activityLoggingAccessPerWorldBindingsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     ScriptState* scriptState = ScriptState::from(info.GetIsolate()->GetCurrentContext());
     V8PerContextData* contextData = scriptState->perContextData();
     if (contextData && contextData->activityLogger()) {
         contextData->activityLogger()->logSetter("TestObject.activityLoggingAccessPerWorldBindingsLongAttribute", v8Value);
@@ skipping 18 matching lines @@
         contextData->activityLogger()->logGetter("TestObject.activityLoggingAccessPerWorldBindingsLongAttribute");
     TestObjectV8Internal::activityLoggingAccessPerWorldBindingsLongAttributeAttributeGetterForMainWorld(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingAccessPerWorldBindingsLongAttributeAttributeSetterForMainWorld(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingAccessPerWorldBindingsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingAccessPerWorldBindingsLongAttribute(cppValue);
 }
 
 static void activityLoggingAccessPerWorldBindingsLongAttributeAttributeSetterCallbackForMainWorld(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     ScriptState* scriptState = ScriptState::from(info.GetIsolate()->GetCurrentContext());
     V8PerContextData* contextData = scriptState->perContextData();
     if (contextData && contextData->activityLogger()) {
         contextData->activityLogger()->logSetter("TestObject.activityLoggingAccessPerWorldBindingsLongAttribute", v8Value);
@@ skipping 18 matching lines @@
         contextData->activityLogger()->logGetter("TestObject.activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttribute");
     TestObjectV8Internal::activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttribute(cppValue);
 }
 
 static void activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     ScriptState* scriptState = ScriptState::from(info.GetIsolate()->GetCurrentContext());
     V8PerContextData* contextData = scriptState->perContextData();
     if (contextData && contextData->activityLogger()) {
         contextData->activityLogger()->logSetter("TestObject.activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttribute", v8Value);
@@ skipping 14 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttributeAttributeGetterForMainWorld(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetterForMainWorld(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttribute(cppValue);
 }
 
 static void activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetterCallbackForMainWorld(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::activityLoggingAccessForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetterForMainWorld(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 13 matching lines @@
         contextData->activityLogger()->logGetter("TestObject.activityLoggingGetterPerWorldBindingsLongAttribute");
     TestObjectV8Internal::activityLoggingGetterPerWorldBindingsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingGetterPerWorldBindingsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingGetterPerWorldBindingsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingGetterPerWorldBindingsLongAttribute(cppValue);
 }
 
 static void activityLoggingGetterPerWorldBindingsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::activityLoggingGetterPerWorldBindingsLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 13 matching lines @@
         contextData->activityLogger()->logGetter("TestObject.activityLoggingGetterPerWorldBindingsLongAttribute");
     TestObjectV8Internal::activityLoggingGetterPerWorldBindingsLongAttributeAttributeGetterForMainWorld(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingGetterPerWorldBindingsLongAttributeAttributeSetterForMainWorld(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingGetterPerWorldBindingsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingGetterPerWorldBindingsLongAttribute(cppValue);
 }
 
 static void activityLoggingGetterPerWorldBindingsLongAttributeAttributeSetterCallbackForMainWorld(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::activityLoggingGetterPerWorldBindingsLongAttributeAttributeSetterForMainWorld(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 13 matching lines @@
         contextData->activityLogger()->logGetter("TestObject.activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttribute");
     TestObjectV8Internal::activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttribute(cppValue);
 }
 
 static void activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeGetterForMainWorld(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttribute());
 }
 
 static void activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeGetterCallbackForMainWorld(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeGetterForMainWorld(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetterForMainWorld(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setActivityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttribute(cppValue);
 }
 
 static void activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetterCallbackForMainWorld(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::activityLoggingGetterForIsolatedWorldsPerWorldBindingsLongAttributeAttributeSetterForMainWorld(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 11 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void locationAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* proxyImpl = V8TestObject::toImpl(holder);
     RefPtrWillBeRawPtr<TestNode> impl = WTF::getPtr(proxyImpl->location());
     if (!impl)
         return;
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setHref(cppValue);
 }
 
 static void locationAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::locationAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 12 matching lines @@
 }
 
 static void locationWithExceptionAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "locationWithException", "TestObject", holder, info.GetIsolate());
     TestObject* proxyImpl = V8TestObject::toImpl(holder);
     RefPtrWillBeRawPtr<TestNode> impl = WTF::getPtr(proxyImpl->locationWithException());
     if (!impl)
         return;
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setHrefThrows(cppValue, exceptionState);
     exceptionState.throwIfNeeded();
 }
 
 static void locationWithExceptionAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::locationWithExceptionAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 12 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void locationWithCallWithAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* proxyImpl = V8TestObject::toImpl(holder);
     RefPtrWillBeRawPtr<TestNode> impl = WTF::getPtr(proxyImpl->locationWithCallWith());
     if (!impl)
         return;
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     ExecutionContext* executionContext = currentExecutionContext(info.GetIsolate());
     impl->setHrefCallWith(executionContext, callingDOMWindow(info.GetIsolate()), enteredDOMWindow(info.GetIsolate()), cppValue);
 }
 
 static void locationWithCallWithAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::locationWithCallWithAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 13 matching lines @@
 }
 
 static void locationByteStringAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "locationByteString", "TestObject", holder, info.GetIsolate());
     TestObject* proxyImpl = V8TestObject::toImpl(holder);
     RefPtrWillBeRawPtr<TestNode> impl = WTF::getPtr(proxyImpl->locationByteString());
     if (!impl)
         return;
-    TONATIVE_VOID_EXCEPTIONSTATE(V8StringResource<>, cppValue, toByteString(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, convertAndThrow(cppValue = toByteString(v8Value, exceptionState), exceptionState), return);
     impl->setHrefByteString(cppValue);
 }
 
 static void locationByteStringAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::locationByteStringAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 11 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void locationWithPerWorldBindingsAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* proxyImpl = V8TestObject::toImpl(holder);
     RefPtrWillBeRawPtr<TestNode> impl = WTF::getPtr(proxyImpl->locationWithPerWorldBindings());
     if (!impl)
         return;
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setHref(cppValue);
 }
 
 static void locationWithPerWorldBindingsAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::locationWithPerWorldBindingsAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 11 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void locationWithPerWorldBindingsAttributeSetterForMainWorld(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* proxyImpl = V8TestObject::toImpl(holder);
     RefPtrWillBeRawPtr<TestNode> impl = WTF::getPtr(proxyImpl->locationWithPerWorldBindings());
     if (!impl)
         return;
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setHref(cppValue);
 }
 
 static void locationWithPerWorldBindingsAttributeSetterCallbackForMainWorld(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::locationWithPerWorldBindingsAttributeSetterForMainWorld(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 11 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void locationTypeCheckingInterfaceAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* proxyImpl = V8TestObject::toImpl(holder);
     RefPtrWillBeRawPtr<TestNode> impl = WTF::getPtr(proxyImpl->locationTypeCheckingInterface());
     if (!impl)
         return;
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setHref(cppValue);
 }
 
 static void locationTypeCheckingInterfaceAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::locationTypeCheckingInterfaceAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 91 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::raisesExceptionLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void raisesExceptionLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "raisesExceptionLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setRaisesExceptionLongAttribute(cppValue, exceptionState);
     exceptionState.throwIfNeeded();
 }
 
 static void raisesExceptionLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::raisesExceptionLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 14 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::raisesExceptionGetterLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void raisesExceptionGetterLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "raisesExceptionGetterLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setRaisesExceptionGetterLongAttribute(cppValue);
 }
 
 static void raisesExceptionGetterLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::raisesExceptionGetterLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void setterRaisesExceptionLongAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->setterRaisesExceptionLongAttribute());
 }
 
 static void setterRaisesExceptionLongAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::setterRaisesExceptionLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void setterRaisesExceptionLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "setterRaisesExceptionLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setSetterRaisesExceptionLongAttribute(cppValue, exceptionState);
     exceptionState.throwIfNeeded();
 }
 
 static void setterRaisesExceptionLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::setterRaisesExceptionLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 183 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::reflectLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void reflectLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "reflectLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setIntegralAttribute(HTMLNames::reflectlongattributeAttr, cppValue);
 }
 
 static void reflectLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::reflectLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 11 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::reflectUnsignedShortAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void reflectUnsignedShortAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "reflectUnsignedShortAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(unsigned, cppValue, toUInt16(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(unsigned, cppValue, convertAndThrow(cppValue = toUInt16(v8Value, exceptionState), exceptionState), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::reflectunsignedshortattributeAttr, cppValue);
 }
 
 static void reflectUnsignedShortAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::reflectUnsignedShortAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 11 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::reflectUnsignedLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void reflectUnsignedLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "reflectUnsignedLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(unsigned, cppValue, toUInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(unsigned, cppValue, convertAndThrow(cppValue = toUInt32(v8Value, exceptionState), exceptionState), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setUnsignedIntegralAttribute(HTMLNames::reflectunsignedlongattributeAttr, cppValue);
 }
 
 static void reflectUnsignedLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::reflectUnsignedLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::idAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void idAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::idAttr, cppValue);
 }
 
 static void idAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::idAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::nameAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void nameAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::nameAttr, cppValue);
 }
 
 static void nameAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::nameAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::classAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void classAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::classAttr, cppValue);
 }
 
 static void classAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::classAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::reflectedIdAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void reflectedIdAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::idAttr, cppValue);
 }
 
 static void reflectedIdAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::reflectedIdAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::reflectedNameAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void reflectedNameAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::nameAttr, cppValue);
 }
 
 static void reflectedNameAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::reflectedNameAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::reflectedClassAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void reflectedClassAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::classAttr, cppValue);
 }
 
 static void reflectedClassAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::reflectedClassAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 18 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::limitedToOnlyOneAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void limitedToOnlyOneAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::limitedtoonlyoneattributeAttr, cppValue);
 }
 
 static void limitedToOnlyOneAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::limitedToOnlyOneAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 22 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::limitedToOnlyAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void limitedToOnlyAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::limitedtoonlyattributeAttr, cppValue);
 }
 
 static void limitedToOnlyAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::limitedToOnlyAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 20 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::limitedToOnlyOtherAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void limitedToOnlyOtherAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::otherAttr, cppValue);
 }
 
 static void limitedToOnlyOtherAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::limitedToOnlyOtherAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 20 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::limitedWithMissingDefaultAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void limitedWithMissingDefaultAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::limitedwithmissingdefaultattributeAttr, cppValue);
 }
 
 static void limitedWithMissingDefaultAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::limitedWithMissingDefaultAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 22 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::limitedWithInvalidMissingDefaultAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void limitedWithInvalidMissingDefaultAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::limitedwithinvalidmissingdefaultattributeAttr, cppValue);
 }
 
 static void limitedWithInvalidMissingDefaultAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::limitedWithInvalidMissingDefaultAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 83 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void locationReplaceableAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* proxyImpl = V8TestObject::toImpl(holder);
     RefPtrWillBeRawPtr<TestNode> impl = WTF::getPtr(proxyImpl->locationReplaceable());
     if (!impl)
         return;
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setHref(cppValue);
 }
 
 static void locationReplaceableAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::locationReplaceableAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void runtimeEnabledLongAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->runtimeEnabledLongAttribute());
 }
 
 static void runtimeEnabledLongAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::runtimeEnabledLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void runtimeEnabledLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "runtimeEnabledLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setRuntimeEnabledLongAttribute(cppValue);
 }
 
 static void runtimeEnabledLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::runtimeEnabledLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void perContextEnabledRuntimeEnabledLongAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueInt(info, impl->perContextEnabledRuntimeEnabledLongAttribute());
 }
 
 static void perContextEnabledRuntimeEnabledLongAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::perContextEnabledRuntimeEnabledLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void perContextEnabledRuntimeEnabledLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "perContextEnabledRuntimeEnabledLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setPerContextEnabledRuntimeEnabledLongAttribute(cppValue);
 }
 
 static void perContextEnabledRuntimeEnabledLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::perContextEnabledRuntimeEnabledLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 14 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 #endif // ENABLE(CONDITION)
 
 #if ENABLE(CONDITION)
 static void conditionalRuntimeEnabledLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "conditionalRuntimeEnabledLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setConditionalRuntimeEnabledLongAttribute(cppValue);
 }
 #endif // ENABLE(CONDITION)
 
 #if ENABLE(CONDITION)
 static void conditionalRuntimeEnabledLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::conditionalRuntimeEnabledLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 11 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::setterCallWithActiveWindowAndFirstWindowStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void setterCallWithActiveWindowAndFirstWindowStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setSetterCallWithActiveWindowAndFirstWindowStringAttribute(callingDOMWindow(info.GetIsolate()), enteredDOMWindow(info.GetIsolate()), cppValue);
 }
 
 static void setterCallWithActiveWindowAndFirstWindowStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::setterCallWithActiveWindowAndFirstWindowStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void setterCallWithExecutionContextStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueString(info, impl->setterCallWithExecutionContextStringAttribute(), info.GetIsolate());
 }
 
 static void setterCallWithExecutionContextStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::setterCallWithExecutionContextStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void setterCallWithExecutionContextStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     ExecutionContext* executionContext = currentExecutionContext(info.GetIsolate());
     impl->setSetterCallWithExecutionContextStringAttribute(executionContext, cppValue);
 }
 
 static void setterCallWithExecutionContextStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::setterCallWithExecutionContextStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatNullAsEmptyStringStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueString(info, impl->treatNullAsEmptyStringStringAttribute(), info.GetIsolate());
 }
 
 static void treatNullAsEmptyStringStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::treatNullAsEmptyStringStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatNullAsEmptyStringStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<TreatNullAsEmptyString>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<TreatNullAsEmptyString>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setTreatNullAsEmptyStringStringAttribute(cppValue);
 }
 
 static void treatNullAsEmptyStringStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::treatNullAsEmptyStringStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatNullAsNullStringStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueString(info, impl->treatNullAsNullStringStringAttribute(), info.GetIsolate());
 }
 
 static void treatNullAsNullStringStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::treatNullAsNullStringStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatNullAsNullStringStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<TreatNullAsNullString>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setTreatNullAsNullStringStringAttribute(cppValue);
 }
 
 static void treatNullAsNullStringStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::treatNullAsNullStringStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsNullStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueStringOrNull(info, impl->treatReturnedNullStringAsNullStringAttribute(), info.GetIsolate());
 }
 
 static void treatReturnedNullStringAsNullStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::treatReturnedNullStringAsNullStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsNullStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setTreatReturnedNullStringAsNullStringAttribute(cppValue);
 }
 
 static void treatReturnedNullStringAsNullStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::treatReturnedNullStringAsNullStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsUndefinedStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueStringOrUndefined(info, impl->treatReturnedNullStringAsUndefinedStringAttribute(), info.GetIsolate());
 }
 
 static void treatReturnedNullStringAsUndefinedStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::treatReturnedNullStringAsUndefinedStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsUndefinedStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setTreatReturnedNullStringAsUndefinedStringAttribute(cppValue);
 }
 
 static void treatReturnedNullStringAsUndefinedStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::treatReturnedNullStringAsUndefinedStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 18 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::cachedTreatReturnedNullStringAsUndefinedStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void cachedTreatReturnedNullStringAsUndefinedStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setCachedTreatReturnedNullStringAsUndefinedStringAttribute(cppValue);
     V8HiddenValue::deleteHiddenValue(info.GetIsolate(), holder, v8AtomicString(info.GetIsolate(), "cachedTreatReturnedNullStringAsUndefinedStringAttribute")); // Invalidate the cached value.
 }
 
 static void cachedTreatReturnedNullStringAsUndefinedStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::cachedTreatReturnedNullStringAsUndefinedStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 10 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::treatReturnedNullStringAsNullByteStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsNullByteStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "treatReturnedNullStringAsNullByteStringAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(V8StringResource<>, cppValue, toByteString(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, convertAndThrow(cppValue = toByteString(v8Value, exceptionState), exceptionState), return);
     impl->setTreatReturnedNullStringAsNullByteStringAttribute(cppValue);
 }
 
 static void treatReturnedNullStringAsNullByteStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::treatReturnedNullStringAsNullByteStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsUndefinedByteStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueStringOrUndefined(info, impl->treatReturnedNullStringAsUndefinedByteStringAttribute(), info.GetIsolate());
 }
 
 static void treatReturnedNullStringAsUndefinedByteStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::treatReturnedNullStringAsUndefinedByteStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsUndefinedByteStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "treatReturnedNullStringAsUndefinedByteStringAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(V8StringResource<>, cppValue, toByteString(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, convertAndThrow(cppValue = toByteString(v8Value, exceptionState), exceptionState), return);
     impl->setTreatReturnedNullStringAsUndefinedByteStringAttribute(cppValue);
 }
 
 static void treatReturnedNullStringAsUndefinedByteStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::treatReturnedNullStringAsUndefinedByteStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsNullUSVStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueStringOrNull(info, impl->treatReturnedNullStringAsNullUSVStringAttribute(), info.GetIsolate());
 }
 
 static void treatReturnedNullStringAsNullUSVStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::treatReturnedNullStringAsNullUSVStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsNullUSVStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "treatReturnedNullStringAsNullUSVStringAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(V8StringResource<>, cppValue, toUSVString(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, convertAndThrow(cppValue = toUSVString(v8Value, exceptionState), exceptionState), return);
     impl->setTreatReturnedNullStringAsNullUSVStringAttribute(cppValue);
 }
 
 static void treatReturnedNullStringAsNullUSVStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::treatReturnedNullStringAsNullUSVStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsUndefinedUSVStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValueStringOrUndefined(info, impl->treatReturnedNullStringAsUndefinedUSVStringAttribute(), info.GetIsolate());
 }
 
 static void treatReturnedNullStringAsUndefinedUSVStringAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::treatReturnedNullStringAsUndefinedUSVStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsUndefinedUSVStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "treatReturnedNullStringAsUndefinedUSVStringAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(V8StringResource<>, cppValue, toUSVString(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, convertAndThrow(cppValue = toUSVString(v8Value, exceptionState), exceptionState), return);
     impl->setTreatReturnedNullStringAsUndefinedUSVStringAttribute(cppValue);
 }
 
 static void treatReturnedNullStringAsUndefinedUSVStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::treatReturnedNullStringAsUndefinedUSVStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void typeCheckingInterfaceFloatAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
     v8SetReturnValue(info, impl->typeCheckingInterfaceFloatAttribute());
 }
 
 static void typeCheckingInterfaceFloatAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::typeCheckingInterfaceFloatAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void typeCheckingInterfaceFloatAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "typeCheckingInterfaceFloatAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(float, cppValue, toFloat(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(float, cppValue, convertAndThrow(cppValue = toFloat(v8Value, exceptionState), exceptionState), return);
     impl->setTypeCheckingInterfaceFloatAttribute(cppValue);
 }
 
 static void typeCheckingInterfaceFloatAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::typeCheckingInterfaceFloatAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 78 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::urlStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void urlStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::urlstringattributeAttr, cppValue);
 }
 
 static void urlStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::urlStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 10 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::urlStringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void urlStringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     impl->setAttribute(HTMLNames::reflectUrlAttributeAttr, cppValue);
 }
 
 static void urlStringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     TestObjectV8Internal::urlStringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 11 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::unforgeableLongAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void unforgeableLongAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "unforgeableLongAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt32(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt32(v8Value, exceptionState), exceptionState), return);
     impl->setUnforgeableLongAttribute(cppValue);
 }
 
 static void unforgeableLongAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::unforgeableLongAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 174 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::shortAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void shortAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     ExceptionState exceptionState(ExceptionState::SetterContext, "shortAttribute", "TestObject", holder, info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(holder);
-    TONATIVE_VOID_EXCEPTIONSTATE(int, cppValue, toInt16(v8Value, exceptionState), exceptionState);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt16(v8Value, exceptionState), exceptionState), return);
     V8TestObject::PrivateScript::shortAttributeAttributeSetter(toLocalFrame(toFrameIfNotDetached(info.GetIsolate()->GetCurrentContext())), impl, cppValue);
 }
 
 static void shortAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::shortAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 11 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::stringAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void stringAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     V8TestObject::PrivateScript::stringAttributeAttributeSetter(toLocalFrame(toFrameIfNotDetached(info.GetIsolate()->GetCurrentContext())), impl, cppValue);
 }
 
 static void stringAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::stringAttributeAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 40 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::attributeImplementedInCPPForPrivateScriptOnlyAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void attributeImplementedInCPPForPrivateScriptOnlyAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     impl->setAttributeImplementedInCPPForPrivateScriptOnly(cppValue);
 }
 
 static void attributeImplementedInCPPForPrivateScriptOnlyAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::attributeImplementedInCPPForPrivateScriptOnlyAttributeSetter(v8Value, info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
@@ skipping 11 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestObjectV8Internal::enumForPrivateScriptAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void enumForPrivateScriptAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     v8::Local<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toImpl(holder);
-    TOSTRING_VOID(V8StringResource<>, cppValue, v8Value);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return);
     String string = cppValue;
     if (!(string == "" || string == "EnumValue1" || string == "EnumValue2" || string == "EnumValue3"))
         return;
     V8TestObject::PrivateScript::enumForPrivateScriptAttributeSetter(toLocalFrame(toFrameIfNotDetached(info.GetIsolate()->GetCurrentContext())), impl, cppValue);
 }
 
 static void enumForPrivateScriptAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
     TestObjectV8Internal::enumForPrivateScriptAttributeSetter(v8Value, info);
@@ skipping 293 matching lines @@
 
 static void voidMethodStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "voidMethodStringArg", "TestObject", 1, info.Length()), info.GetIsolate());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
     }
     impl->voidMethodStringArg(stringArg);
 }
 
 static void voidMethodStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodByteStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodByteStringArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(stringArg, toByteString(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(stringArg = toByteString(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodByteStringArg(stringArg);
 }
 
 static void voidMethodByteStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodByteStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodUSVStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodUSVStringArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> usvStringArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(usvStringArg, toUSVString(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(usvStringArg = toUSVString(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodUSVStringArg(usvStringArg);
 }
 
 static void voidMethodUSVStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodUSVStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDOMTimeStampArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDOMTimeStampArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     unsigned long long domTimeStampArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(domTimeStampArg, toUInt64(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(domTimeStampArg = toUInt64(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodDOMTimeStampArg(domTimeStampArg);
 }
 
 static void voidMethodDOMTimeStampArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDOMTimeStampArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 23 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodByteArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int byteArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(byteArg, toInt8(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(byteArg = toInt8(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodByteArg(byteArg);
 }
 
 static void voidMethodByteArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodByteArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDoubleArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDoubleArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     double doubleArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(doubleArg, toDouble(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(doubleArg = toDouble(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodDoubleArg(doubleArg);
 }
 
 static void voidMethodDoubleArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDoubleArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodFloatArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodFloatArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     float floatArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(floatArg, toFloat(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(floatArg = toFloat(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodFloatArg(floatArg);
 }
 
 static void voidMethodFloatArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodFloatArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodLongArg(longArg);
 }
 
 static void voidMethodLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodLongLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodLongLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     long long longLongArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longLongArg, toInt64(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longLongArg = toInt64(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodLongLongArg(longLongArg);
 }
 
 static void voidMethodLongLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodLongLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodOctetArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodOctetArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     unsigned octetArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(octetArg, toUInt8(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(octetArg = toUInt8(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodOctetArg(octetArg);
 }
 
 static void voidMethodOctetArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodOctetArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodShortArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodShortArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int shortArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(shortArg, toInt16(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(shortArg = toInt16(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodShortArg(shortArg);
 }
 
 static void voidMethodShortArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodShortArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodUnsignedLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodUnsignedLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     unsigned unsignedLongArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(unsignedLongArg, toUInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(unsignedLongArg = toUInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodUnsignedLongArg(unsignedLongArg);
 }
 
 static void voidMethodUnsignedLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodUnsignedLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodUnsignedLongLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodUnsignedLongLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     unsigned long long unsignedLongLongArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(unsignedLongLongArg, toUInt64(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(unsignedLongLongArg = toUInt64(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodUnsignedLongLongArg(unsignedLongLongArg);
 }
 
 static void voidMethodUnsignedLongLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodUnsignedLongLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodUnsignedShortArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodUnsignedShortArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     unsigned unsignedShortArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(unsignedShortArg, toUInt16(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(unsignedShortArg = toUInt16(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodUnsignedShortArg(unsignedShortArg);
 }
 
 static void voidMethodUnsignedShortArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodUnsignedShortArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 37 matching lines @@
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodLongArgTestInterfaceEmptyArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 2)) {
         setMinimumArityTypeError(exceptionState, 2, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     TestInterfaceEmpty* testInterfaceEmptyArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
         testInterfaceEmptyArg = V8TestInterfaceEmpty::toImplWithTypeCheck(info.GetIsolate(), info[1]);
     }
     impl->voidMethodLongArgTestInterfaceEmptyArg(longArg, testInterfaceEmptyArg);
 }
 
 static void voidMethodLongArgTestInterfaceEmptyArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodLongArgTestInterfaceEmptyArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 519 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodArrayLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<int> arrayLongArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arrayLongArg, toImplArray<int>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arrayLongArg = toImplArray<int>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState), return);
     }
     impl->voidMethodArrayLongArg(arrayLongArg);
 }
 
 static void voidMethodArrayLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodArrayLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodArrayStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodArrayStringArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<String> arrayStringArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arrayStringArg, toImplArray<String>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arrayStringArg = toImplArray<String>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState), return);
     }
     impl->voidMethodArrayStringArg(arrayStringArg);
 }
 
 static void voidMethodArrayStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodArrayStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodArrayTestInterfaceEmptyArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodArrayTestInterfaceEmptyArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<RefPtr<TestInterfaceEmpty>> arrayTestInterfaceEmptyArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arrayTestInterfaceEmptyArg, (toRefPtrNativeArray<TestInterfaceEmpty, V8TestInterfaceEmpty>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arrayTestInterfaceEmptyArg = (toRefPtrNativeArray<TestInterfaceEmpty, V8TestInterfaceEmpty>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState), return);
     }
     impl->voidMethodArrayTestInterfaceEmptyArg(arrayTestInterfaceEmptyArg);
 }
 
 static void voidMethodArrayTestInterfaceEmptyArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodArrayTestInterfaceEmptyArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 41 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodSequenceLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<int> longSequenceArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longSequenceArg, toImplArray<int>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longSequenceArg = toImplArray<int>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState), return);
     }
     impl->voidMethodSequenceLongArg(longSequenceArg);
 }
 
 static void voidMethodSequenceLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodSequenceLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodSequenceStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodSequenceStringArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<String> stringSequenceArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(stringSequenceArg, toImplArray<String>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(stringSequenceArg = toImplArray<String>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState), return);
     }
     impl->voidMethodSequenceStringArg(stringSequenceArg);
 }
 
 static void voidMethodSequenceStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodSequenceStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodSequenceTestInterfaceEmptyArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodSequenceTestInterfaceEmptyArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<RefPtr<TestInterfaceEmpty>> testInterfaceEmptySequenceArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(testInterfaceEmptySequenceArg, (toRefPtrNativeArray<TestInterfaceEmpty, V8TestInterfaceEmpty>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(testInterfaceEmptySequenceArg = (toRefPtrNativeArray<TestInterfaceEmpty, V8TestInterfaceEmpty>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState), return);
     }
     impl->voidMethodSequenceTestInterfaceEmptyArg(testInterfaceEmptySequenceArg);
 }
 
 static void voidMethodSequenceTestInterfaceEmptyArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodSequenceTestInterfaceEmptyArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodSequenceSequenceDOMStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodSequenceSequenceDOMStringArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<Vector<String>> stringSequenceSequenceArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(stringSequenceSequenceArg, toImplArray<Vector<String>>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(stringSequenceSequenceArg = toImplArray<Vector<String>>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState), return);
     }
     impl->voidMethodSequenceSequenceDOMStringArg(stringSequenceSequenceArg);
 }
 
 static void voidMethodSequenceSequenceDOMStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodSequenceSequenceDOMStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 122 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDoubleOrDOMStringArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     DoubleOrString arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8DoubleOrString::toImpl(info.GetIsolate(), info[0], arg, exceptionState), exceptionState);
+        TONATIVE_CONVERT(V8DoubleOrString::toImpl(info.GetIsolate(), info[0], arg, exceptionState), return exceptionState.throwException());
     }
     impl->voidMethodDoubleOrDOMStringArg(arg);
 }
 
 static void voidMethodDoubleOrDOMStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDoubleOrDOMStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDoubleOrDOMStringOrNullArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDoubleOrDOMStringOrNullArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     DoubleOrString arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), info[0], arg, exceptionState), exceptionState);
+        TONATIVE_CONVERT(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), info[0], arg, exceptionState), return exceptionState.throwException());
     }
     impl->voidMethodDoubleOrDOMStringOrNullArg(arg);
 }
 
 static void voidMethodDoubleOrDOMStringOrNullArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDoubleOrDOMStringOrNullArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDoubleOrNullOrDOMStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDoubleOrNullOrDOMStringArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     DoubleOrString arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), info[0], arg, exceptionState), exceptionState);
+        TONATIVE_CONVERT(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), info[0], arg, exceptionState), return exceptionState.throwException());
     }
     impl->voidMethodDoubleOrNullOrDOMStringArg(arg);
 }
 
 static void voidMethodDoubleOrNullOrDOMStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDoubleOrNullOrDOMStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDOMStringOrArrayBufferOrArrayBufferViewArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDOMStringOrArrayBufferOrArrayBufferViewArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     StringOrArrayBufferOrArrayBufferView arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8StringOrArrayBufferOrArrayBufferView::toImpl(info.GetIsolate(), info[0], arg, exceptionState), exceptionState);
+        TONATIVE_CONVERT(V8StringOrArrayBufferOrArrayBufferView::toImpl(info.GetIsolate(), info[0], arg, exceptionState), return exceptionState.throwException());
     }
     impl->voidMethodDOMStringOrArrayBufferOrArrayBufferViewArg(arg);
 }
 
 static void voidMethodDOMStringOrArrayBufferOrArrayBufferViewArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDOMStringOrArrayBufferOrArrayBufferViewArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodArrayBufferOrArrayBufferViewOrDictionaryArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodArrayBufferOrArrayBufferViewOrDictionaryArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     ArrayBufferOrArrayBufferViewOrDictionary arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8ArrayBufferOrArrayBufferViewOrDictionary::toImpl(info.GetIsolate(), info[0], arg, exceptionState), exceptionState);
+        TONATIVE_CONVERT(V8ArrayBufferOrArrayBufferViewOrDictionary::toImpl(info.GetIsolate(), info[0], arg, exceptionState), return exceptionState.throwException());
     }
     impl->voidMethodArrayBufferOrArrayBufferViewOrDictionaryArg(arg);
 }
 
 static void voidMethodArrayBufferOrArrayBufferViewOrDictionaryArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodArrayBufferOrArrayBufferViewOrDictionaryArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 109 matching lines @@
 
 static void voidMethodTestEnumArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "voidMethodTestEnumArg", "TestObject", 1, info.Length()), info.GetIsolate());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> testEnumTypeArg;
     {
-        TOSTRING_VOID_INTERNAL(testEnumTypeArg, info[0]);
+        TONATIVE_CONVERT((testEnumTypeArg = info[0]).prepare(), return);
         String string = testEnumTypeArg;
         if (!(string == "" || string == "EnumValue1" || string == "EnumValue2" || string == "EnumValue3")) {
             V8ThrowException::throwTypeError(info.GetIsolate(), ExceptionMessages::failedToExecute("voidMethodTestEnumArg", "TestObject", "parameter 1 ('" + string + "') is not a valid enum value."));
             return;
         }
     }
     impl->voidMethodTestEnumArg(testEnumTypeArg);
 }
 
 static void voidMethodTestEnumArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
@@ skipping 48 matching lines @@
     TestObjectV8Internal::nullableTestDictionaryMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void passPermissiveDictionaryMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "passPermissiveDictionaryMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     TestDictionary arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8TestDictionary::toImpl(info.GetIsolate(), info[0], arg, exceptionState), exceptionState);
+        TONATIVE_CONVERT(V8TestDictionary::toImpl(info.GetIsolate(), info[0], arg, exceptionState), return exceptionState.throwException());
     }
     impl->passPermissiveDictionaryMethod(arg);
 }
 
 static void passPermissiveDictionaryMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::passPermissiveDictionaryMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void nodeFilterMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     v8SetReturnValue(info, impl->nodeFilterMethod());
 }
 
 static void nodeFilterMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::nodeFilterMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
-static void promiseMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
+static void promiseMethodMethodPromise(const v8::FunctionCallbackInfo<v8::Value>& info, ExceptionState& exceptionState)
 {
-    ExceptionState exceptionState(ExceptionState::ExecutionContext, "promiseMethod", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 3)) {
         setMinimumArityTypeError(exceptionState, 3, info.Length());
-        v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int arg1;
     Dictionary arg2;
     V8StringResource<> arg3;
     Vector<String> variadic;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_PROMISE_INTERNAL(arg1, toInt32(info[0], exceptionState), exceptionState, info, ScriptState::current(info.GetIsolate()));
+        TONATIVE_CONVERT(convertAndCheck(arg1 = toInt32(info[0], exceptionState), exceptionState), return);
         if (!isUndefinedOrNull(info[1]) && !info[1]->IsObject()) {
             exceptionState.throwTypeError("parameter 2 ('arg2') is not an object.");
-            v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_PROMISE_INTERNAL(arg2, Dictionary(info[1], info.GetIsolate(), exceptionState), exceptionState, info, ScriptState::current(info.GetIsolate()));
-        TOSTRING_VOID_EXCEPTIONSTATE_PROMISE_INTERNAL(arg3, info[2], exceptionState, info, ScriptState::current(info.GetIsolate()));
-        TONATIVE_VOID_EXCEPTIONSTATE_PROMISE_INTERNAL(variadic, toImplArguments<String>(info, 3, exceptionState), exceptionState, info, ScriptState::current(info.GetIsolate()));
+        TONATIVE_CONVERT(convertAndCheck(arg2 = Dictionary(info[1], info.GetIsolate(), exceptionState), exceptionState), return);
+        TONATIVE_CONVERT((arg3 = info[2]).prepare(exceptionState), return);
+        TONATIVE_CONVERT(convertAndCheck(variadic = toImplArguments<String>(info, 3, exceptionState), exceptionState), return);
     }
     v8SetReturnValue(info, impl->promiseMethod(arg1, arg2, arg3, variadic).v8Value());
 }
 
+static void promiseMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    ExceptionState exceptionState(ExceptionState::ExecutionContext, "promiseMethod", "TestObject", info.Holder(), info.GetIsolate());
+    promiseMethodMethodPromise(info, exceptionState);
+    if (exceptionState.hadException())
+        v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
+}
+
 static void promiseMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::promiseMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
-static void promiseMethodWithoutExceptionStateMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
+static void promiseMethodWithoutExceptionStateMethodPromise(const v8::FunctionCallbackInfo<v8::Value>& info, ExceptionState& exceptionState)
 {
-    ExceptionState exceptionState(ExceptionState::ExecutionContext, "promiseMethodWithoutExceptionState", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
-        v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Dictionary arg1;
     {
         if (!isUndefinedOrNull(info[0]) && !info[0]->IsObject()) {
             exceptionState.throwTypeError("parameter 1 ('arg1') is not an object.");
-            v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_PROMISE_INTERNAL(arg1, Dictionary(info[0], info.GetIsolate(), exceptionState), exceptionState, info, ScriptState::current(info.GetIsolate()));
+        TONATIVE_CONVERT(convertAndCheck(arg1 = Dictionary(info[0], info.GetIsolate(), exceptionState), exceptionState), return);
     }
     v8SetReturnValue(info, impl->promiseMethodWithoutExceptionState(arg1).v8Value());
 }
 
+static void promiseMethodWithoutExceptionStateMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    ExceptionState exceptionState(ExceptionState::ExecutionContext, "promiseMethodWithoutExceptionState", "TestObject", info.Holder(), info.GetIsolate());
+    promiseMethodWithoutExceptionStateMethodPromise(info, exceptionState);
+    if (exceptionState.hadException())
+        v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
+}
+
 static void promiseMethodWithoutExceptionStateMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::promiseMethodWithoutExceptionStateMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void serializedScriptValueMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
@@ skipping 29 matching lines @@
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Dictionary dictionaryArg;
     {
         if (!isUndefinedOrNull(info[0]) && !info[0]->IsObject()) {
             exceptionState.throwTypeError("parameter 1 ('dictionaryArg') is not an object.");
             exceptionState.throwIfNeeded();
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(dictionaryArg, Dictionary(info[0], info.GetIsolate(), exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(dictionaryArg = Dictionary(info[0], info.GetIsolate(), exceptionState), exceptionState), return);
     }
     impl->voidMethodDictionaryArg(dictionaryArg);
 }
 
 static void voidMethodDictionaryArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDictionaryArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 48 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodSerializedScriptValueArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     RefPtr<SerializedScriptValue> serializedScriptValueArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(serializedScriptValueArg, SerializedScriptValueFactory::instance().create(info[0], 0, 0, exceptionState, info.GetIsolate()), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(serializedScriptValueArg = SerializedScriptValueFactory::instance().create(info[0], 0, 0, exceptionState, info.GetIsolate()), exceptionState), return);
     }
     impl->voidMethodSerializedScriptValueArg(serializedScriptValueArg);
 }
 
 static void voidMethodSerializedScriptValueArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodSerializedScriptValueArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 23 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDictionarySequenceArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<Dictionary> dictionarySequenceArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(dictionarySequenceArg, toImplArray<Dictionary>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(dictionarySequenceArg = toImplArray<Dictionary>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState), return);
     }
     impl->voidMethodDictionarySequenceArg(dictionarySequenceArg);
 }
 
 static void voidMethodDictionarySequenceArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDictionarySequenceArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodStringArgLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodStringArgLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 2)) {
         setMinimumArityTypeError(exceptionState, 2, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     int longArg;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[1], exceptionState), exceptionState);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[1], exceptionState), exceptionState), return);
     }
     impl->voidMethodStringArgLongArg(stringArg, longArg);
 }
 
 static void voidMethodStringArgLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodStringArgLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodOptionalStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> optionalStringArg;
     {
         if (UNLIKELY(info.Length() <= 0)) {
             impl->voidMethodOptionalStringArg();
             return;
         }
-        TOSTRING_VOID_INTERNAL(optionalStringArg, info[0]);
+        TONATIVE_CONVERT((optionalStringArg = info[0]).prepare(), return);
     }
     impl->voidMethodOptionalStringArg(optionalStringArg);
 }
 
 static void voidMethodOptionalStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodOptionalStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 22 matching lines @@
 static void voidMethodOptionalLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodOptionalLongArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int optionalLongArg;
     {
         if (UNLIKELY(info.Length() <= 0)) {
             impl->voidMethodOptionalLongArg();
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(optionalLongArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(optionalLongArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodOptionalLongArg(optionalLongArg);
 }
 
 static void voidMethodOptionalLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodOptionalLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void stringMethodOptionalLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "stringMethodOptionalLongArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int optionalLongArg;
     {
         if (UNLIKELY(info.Length() <= 0)) {
             v8SetReturnValueString(info, impl->stringMethodOptionalLongArg(), info.GetIsolate());
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(optionalLongArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(optionalLongArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     v8SetReturnValueString(info, impl->stringMethodOptionalLongArg(optionalLongArg), info.GetIsolate());
 }
 
 static void stringMethodOptionalLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::stringMethodOptionalLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void testInterfaceEmptyMethodOptionalLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "testInterfaceEmptyMethodOptionalLongArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int optionalLongArg;
     {
         if (UNLIKELY(info.Length() <= 0)) {
             v8SetReturnValue(info, impl->testInterfaceEmptyMethodOptionalLongArg());
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(optionalLongArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(optionalLongArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     v8SetReturnValue(info, impl->testInterfaceEmptyMethodOptionalLongArg(optionalLongArg));
 }
 
 static void testInterfaceEmptyMethodOptionalLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::testInterfaceEmptyMethodOptionalLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void longMethodOptionalLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "longMethodOptionalLongArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int optionalLongArg;
     {
         if (UNLIKELY(info.Length() <= 0)) {
             v8SetReturnValueInt(info, impl->longMethodOptionalLongArg());
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(optionalLongArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(optionalLongArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     v8SetReturnValueInt(info, impl->longMethodOptionalLongArg(optionalLongArg));
 }
 
 static void longMethodOptionalLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::longMethodOptionalLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodLongArgOptionalLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodLongArgOptionalLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     int optionalLongArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
         if (UNLIKELY(info.Length() <= 1)) {
             impl->voidMethodLongArgOptionalLongArg(longArg);
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(optionalLongArg, toInt32(info[1], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(optionalLongArg = toInt32(info[1], exceptionState), exceptionState), return);
     }
     impl->voidMethodLongArgOptionalLongArg(longArg, optionalLongArg);
 }
 
 static void voidMethodLongArgOptionalLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodLongArgOptionalLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodLongArgOptionalLongArgOptionalLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodLongArgOptionalLongArgOptionalLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     int optionalLongArg1;
     int optionalLongArg2;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
         if (UNLIKELY(info.Length() <= 1)) {
             impl->voidMethodLongArgOptionalLongArgOptionalLongArg(longArg);
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(optionalLongArg1, toInt32(info[1], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(optionalLongArg1 = toInt32(info[1], exceptionState), exceptionState), return);
         if (UNLIKELY(info.Length() <= 2)) {
             impl->voidMethodLongArgOptionalLongArgOptionalLongArg(longArg, optionalLongArg1);
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(optionalLongArg2, toInt32(info[2], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(optionalLongArg2 = toInt32(info[2], exceptionState), exceptionState), return);
     }
     impl->voidMethodLongArgOptionalLongArgOptionalLongArg(longArg, optionalLongArg1, optionalLongArg2);
 }
 
 static void voidMethodLongArgOptionalLongArgOptionalLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodLongArgOptionalLongArgOptionalLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodLongArgOptionalTestInterfaceEmptyArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodLongArgOptionalTestInterfaceEmptyArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     TestInterfaceEmpty* optionalTestInterfaceEmpty;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
         if (UNLIKELY(info.Length() <= 1)) {
             impl->voidMethodLongArgOptionalTestInterfaceEmptyArg(longArg);
             return;
         }
         optionalTestInterfaceEmpty = V8TestInterfaceEmpty::toImplWithTypeCheck(info.GetIsolate(), info[1]);
     }
     impl->voidMethodLongArgOptionalTestInterfaceEmptyArg(longArg, optionalTestInterfaceEmpty);
 }
 
 static void voidMethodLongArgOptionalTestInterfaceEmptyArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
@@ skipping 13 matching lines @@
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     TestInterfaceEmpty* optionalTestInterfaceEmpty;
     int longArg;
     {
         optionalTestInterfaceEmpty = V8TestInterfaceEmpty::toImplWithTypeCheck(info.GetIsolate(), info[0]);
         if (UNLIKELY(info.Length() <= 1)) {
             impl->voidMethodTestInterfaceEmptyArgOptionalLongArg(optionalTestInterfaceEmpty);
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[1], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[1], exceptionState), exceptionState), return);
     }
     impl->voidMethodTestInterfaceEmptyArgOptionalLongArg(optionalTestInterfaceEmpty, longArg);
 }
 
 static void voidMethodTestInterfaceEmptyArgOptionalLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodTestInterfaceEmptyArgOptionalLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodOptionalDictionaryArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodOptionalDictionaryArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Dictionary optionalDictionaryArg;
     {
         if (!isUndefinedOrNull(info[0]) && !info[0]->IsObject()) {
             exceptionState.throwTypeError("parameter 1 ('optionalDictionaryArg') is not an object.");
             exceptionState.throwIfNeeded();
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(optionalDictionaryArg, Dictionary(info[0], info.GetIsolate(), exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(optionalDictionaryArg = Dictionary(info[0], info.GetIsolate(), exceptionState), exceptionState), return);
     }
     impl->voidMethodOptionalDictionaryArg(optionalDictionaryArg);
 }
 
 static void voidMethodOptionalDictionaryArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodOptionalDictionaryArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDefaultByteStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDefaultByteStringArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> defaultByteStringArg;
     {
         if (!info[0]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(defaultByteStringArg, toByteString(info[0], exceptionState), exceptionState);
+            TONATIVE_CONVERT(convertAndThrow(defaultByteStringArg = toByteString(info[0], exceptionState), exceptionState), return);
         } else {
             defaultByteStringArg = String("foo");
         }
     }
     impl->voidMethodDefaultByteStringArg(defaultByteStringArg);
 }
 
 static void voidMethodDefaultByteStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultByteStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDefaultStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> defaultStringArg;
     {
         if (!info[0]->IsUndefined()) {
-            TOSTRING_VOID_INTERNAL(defaultStringArg, info[0]);
+            TONATIVE_CONVERT((defaultStringArg = info[0]).prepare(), return);
         } else {
             defaultStringArg = String("foo");
         }
     }
     impl->voidMethodDefaultStringArg(defaultStringArg);
 }
 
 static void voidMethodDefaultStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDefaultIntegerArgsMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDefaultIntegerArgs", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int defaultLongArg;
     long long defaultLongLongArg;
     unsigned defaultUnsignedArg;
     {
         if (!info[0]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(defaultLongArg, toInt32(info[0], exceptionState), exceptionState);
+            TONATIVE_CONVERT(convertAndThrow(defaultLongArg = toInt32(info[0], exceptionState), exceptionState), return);
         } else {
             defaultLongArg = 10;
         }
         if (!info[1]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(defaultLongLongArg, toInt64(info[1], exceptionState), exceptionState);
+            TONATIVE_CONVERT(convertAndThrow(defaultLongLongArg = toInt64(info[1], exceptionState), exceptionState), return);
         } else {
             defaultLongLongArg = -10;
         }
         if (!info[2]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(defaultUnsignedArg, toUInt32(info[2], exceptionState), exceptionState);
+            TONATIVE_CONVERT(convertAndThrow(defaultUnsignedArg = toUInt32(info[2], exceptionState), exceptionState), return);
         } else {
             defaultUnsignedArg = 4294967295u;
         }
     }
     impl->voidMethodDefaultIntegerArgs(defaultLongArg, defaultLongLongArg, defaultUnsignedArg);
 }
 
 static void voidMethodDefaultIntegerArgsMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultIntegerArgsMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDefaultDoubleArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDefaultDoubleArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     double defaultDoubleArg;
     {
         if (!info[0]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(defaultDoubleArg, toDouble(info[0], exceptionState), exceptionState);
+            TONATIVE_CONVERT(convertAndThrow(defaultDoubleArg = toDouble(info[0], exceptionState), exceptionState), return);
         } else {
             defaultDoubleArg = 0.5;
         }
     }
     impl->voidMethodDefaultDoubleArg(defaultDoubleArg);
 }
 
 static void voidMethodDefaultDoubleArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
@@ skipping 43 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDefaultNullableByteStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDefaultNullableByteStringArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<TreatNullAsNullString> defaultStringArg;
     {
         if (!info[0]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(defaultStringArg, toByteString(info[0], exceptionState), exceptionState);
+            TONATIVE_CONVERT(convertAndThrow(defaultStringArg = toByteString(info[0], exceptionState), exceptionState), return);
         } else {
             defaultStringArg = nullptr;
         }
     }
     impl->voidMethodDefaultNullableByteStringArg(defaultStringArg);
 }
 
 static void voidMethodDefaultNullableByteStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultNullableByteStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDefaultNullableStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<TreatNullAsNullString> defaultStringArg;
     {
         if (!info[0]->IsUndefined()) {
-            TOSTRING_VOID_INTERNAL(defaultStringArg, info[0]);
+            TONATIVE_CONVERT((defaultStringArg = info[0]).prepare(), return);
         } else {
             defaultStringArg = nullptr;
         }
     }
     impl->voidMethodDefaultNullableStringArg(defaultStringArg);
 }
 
 static void voidMethodDefaultNullableStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
@@ skipping 24 matching lines @@
 
 static void voidMethodDefaultDoubleOrStringArgsMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDefaultDoubleOrStringArgs", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     DoubleOrString defaultLongArg;
     DoubleOrString defaultStringArg;
     DoubleOrString defaultNullArg;
     {
         if (!info[0]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8DoubleOrString::toImpl(info.GetIsolate(), info[0], defaultLongArg, exceptionState), exceptionState);
+            TONATIVE_CONVERT(V8DoubleOrString::toImpl(info.GetIsolate(), info[0], defaultLongArg, exceptionState), return exceptionState.throwException());
         } else {
             defaultLongArg.setDouble(10);
         }
         if (!info[1]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), info[1], defaultStringArg, exceptionState), exceptionState);
+            TONATIVE_CONVERT(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), info[1], defaultStringArg, exceptionState), return exceptionState.throwException());
         } else {
             defaultStringArg.setString(String("foo"));
         }
         if (!info[2]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), info[2], defaultNullArg, exceptionState), exceptionState);
+            TONATIVE_CONVERT(V8DoubleOrStringOrNull::toImpl(info.GetIsolate(), info[2], defaultNullArg, exceptionState), return exceptionState.throwException());
         } else {
             /* null default value */;
         }
     }
     impl->voidMethodDefaultDoubleOrStringArgs(defaultLongArg, defaultStringArg, defaultNullArg);
 }
 
 static void voidMethodDefaultDoubleOrStringArgsMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultDoubleOrStringArgsMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDefaultStringSequenceArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDefaultStringSequenceArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<String> defaultStringSequenceArg;
     {
         if (!info[0]->IsUndefined()) {
-            TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(defaultStringSequenceArg, toImplArray<String>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState);
+            TONATIVE_CONVERT(convertAndThrow(defaultStringSequenceArg = toImplArray<String>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState), return);
         } else {
             /* Nothing to do */;
         }
     }
     impl->voidMethodDefaultStringSequenceArg(defaultStringSequenceArg);
 }
 
 static void voidMethodDefaultStringSequenceArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultStringSequenceArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodVariadicStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodVariadicStringArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<String> variadicStringArgs;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(variadicStringArgs, toImplArguments<String>(info, 0, exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(variadicStringArgs = toImplArguments<String>(info, 0, exceptionState), exceptionState), return);
     }
     impl->voidMethodVariadicStringArg(variadicStringArgs);
 }
 
 static void voidMethodVariadicStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodVariadicStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodStringArgVariadicStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodStringArgVariadicStringArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     Vector<String> variadicStringArgs;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(variadicStringArgs, toImplArguments<String>(info, 1, exceptionState), exceptionState);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
+        TONATIVE_CONVERT(convertAndThrow(variadicStringArgs = toImplArguments<String>(info, 1, exceptionState), exceptionState), return);
     }
     impl->voidMethodStringArgVariadicStringArg(stringArg, variadicStringArgs);
 }
 
 static void voidMethodStringArgVariadicStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodStringArgVariadicStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 104 matching lines @@
     TestObjectV8Internal::voidMethodVariadicTestInterfaceWillBeGarbageCollectedArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodA1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodA", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodA(longArg);
 }
 
 static void overloadedMethodA2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodA", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg1;
     int longArg2;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg1, toInt32(info[0], exceptionState), exceptionState);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg2, toInt32(info[1], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg1 = toInt32(info[0], exceptionState), exceptionState), return);
+        TONATIVE_CONVERT(convertAndThrow(longArg2 = toInt32(info[1], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodA(longArg1, longArg2);
 }
 
 static void overloadedMethodAMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodA", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(2, info.Length())) {
     case 1:
         if (true) {
@@ skipping 10 matching lines @@
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodAMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodAMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodB1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodB", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodB(longArg);
 }
 
 static void overloadedMethodB2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodB", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     int longArg;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
         if (UNLIKELY(info.Length() <= 1)) {
             impl->overloadedMethodB(stringArg);
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[1], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[1], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodB(stringArg, longArg);
 }
 
 static void overloadedMethodBMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodB", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(2, info.Length())) {
     case 1:
         if (info[0]->IsNumber()) {
@@ skipping 18 matching lines @@
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodBMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodBMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodC1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodC", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodC(longArg);
 }
 
 static void overloadedMethodC2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     TestInterfaceEmpty* testInterfaceEmptyArg;
     {
         testInterfaceEmptyArg = V8TestInterfaceEmpty::toImplWithTypeCheck(info.GetIsolate(), info[0]);
@@ skipping 18 matching lines @@
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodCMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodCMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodD1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodD", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodD(longArg);
 }
 
 static void overloadedMethodD2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodD", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Vector<int> longArrayArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArrayArg, toImplArray<int>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArrayArg = toImplArray<int>(info[0], 1, info.GetIsolate(), exceptionState), exceptionState), return);
     }
     impl->overloadedMethodD(longArrayArg);
 }
 
 static void overloadedMethodDMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodD", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 1:
         if (info[0]->IsArray()) {
             overloadedMethodD2Method(info);
             return;
         }
         if (true) {
             overloadedMethodD1Method(info);
             return;
         }
         break;
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodDMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodDMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodE1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodE", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodE(longArg);
 }
 
 static void overloadedMethodE2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     TestInterfaceEmpty* testInterfaceEmptyOrNullArg;
     {
         testInterfaceEmptyOrNullArg = V8TestInterfaceEmpty::toImplWithTypeCheck(info.GetIsolate(), info[0]);
@@ skipping 22 matching lines @@
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodEMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodEMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodF1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     {
         if (UNLIKELY(info.Length() <= 0)) {
             impl->overloadedMethodF();
             return;
         }
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
     }
     impl->overloadedMethodF(stringArg);
 }
 
 static void overloadedMethodF2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodF", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     double doubleArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(doubleArg, toDouble(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(doubleArg = toDouble(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodF(doubleArg);
 }
 
 static void overloadedMethodFMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodF", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
@@ skipping 17 matching lines @@
         if (true) {
             overloadedMethodF2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodFMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodFMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodG1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodG", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodG(longArg);
 }
 
 static void overloadedMethodG2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     TestInterfaceEmpty* testInterfaceEmptyOrNullArg;
     {
         if (!info[0]->IsUndefined()) {
@@ skipping 31 matching lines @@
         if (true) {
             overloadedMethodG1Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodGMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodGMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodH1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
@@ skipping 33 matching lines @@
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodHMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodHMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodI1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
     }
     impl->overloadedMethodI(stringArg);
 }
 
 static void overloadedMethodI2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodI", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     double doubleArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(doubleArg, toDouble(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(doubleArg = toDouble(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedMethodI(doubleArg);
 }
 
 static void overloadedMethodIMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodI", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 1:
         if (info[0]->IsNumber()) {
@@ skipping 12 matching lines @@
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodIMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodIMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodJ1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
     }
     impl->overloadedMethodJ(stringArg);
 }
 
 static void overloadedMethodJ2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodJ", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     TestDictionary testDictionaryArg;
     {
         if (!isUndefinedOrNull(info[0]) && !info[0]->IsObject()) {
             exceptionState.throwTypeError("parameter 1 ('testDictionaryArg') is not an object.");
             exceptionState.throwIfNeeded();
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8TestDictionary::toImpl(info.GetIsolate(), info[0], testDictionaryArg, exceptionState), exceptionState);
+        TONATIVE_CONVERT(V8TestDictionary::toImpl(info.GetIsolate(), info[0], testDictionaryArg, exceptionState), return exceptionState.throwException());
     }
     impl->overloadedMethodJ(testDictionaryArg);
 }
 
 static void overloadedMethodJMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodJ", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 1:
         if (info[0]->IsObject()) {
             overloadedMethodJ2Method(info);
             return;
         }
         if (true) {
             overloadedMethodJ1Method(info);
             return;
         }
         break;
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodJMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodJMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodK1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     ScriptValue functionArg;
     {
         if (!info[0]->IsFunction()) {
             V8ThrowException::throwTypeError(info.GetIsolate(), ExceptionMessages::failedToExecute("overloadedMethodK", "TestObject", "The callback provided as parameter 1 is not a function."));
             return;
         }
         functionArg = ScriptValue(ScriptState::current(info.GetIsolate()), info[0]);
     }
     impl->overloadedMethodK(functionArg);
 }
 
 static void overloadedMethodK2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
     }
     impl->overloadedMethodK(stringArg);
 }
 
 static void overloadedMethodKMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodK", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 1:
         if (info[0]->IsFunction()) {
             overloadedMethodK1Method(info);
             return;
         }
         if (true) {
             overloadedMethodK2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodKMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodKMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedMethodL1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodL", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     Vector<ScriptValue> restArgs;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(restArgs, toImplArguments<ScriptValue>(info, 1, exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
+        TONATIVE_CONVERT(convertAndThrow(restArgs = toImplArguments<ScriptValue>(info, 1, exceptionState), exceptionState), return);
     }
     impl->overloadedMethodL(longArg, restArgs);
 }
 
 static void overloadedMethodL2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodL", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     Vector<ScriptValue> restArgs;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(restArgs, toImplArguments<ScriptValue>(info, 1, exceptionState), exceptionState);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
+        TONATIVE_CONVERT(convertAndThrow(restArgs = toImplArguments<ScriptValue>(info, 1, exceptionState), exceptionState), return);
     }
     impl->overloadedMethodL(stringArg, restArgs);
 }
 
 static void overloadedMethodLMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedMethodL", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(2, info.Length())) {
     case 1:
         if (info[0]->IsNumber()) {
@@ skipping 26 matching lines @@
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedMethodLMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedMethodLMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void promiseOverloadMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     v8SetReturnValue(info, impl->promiseOverloadMethod().v8Value());
 }
 
+static void promiseOverloadMethod2MethodPromise(const v8::FunctionCallbackInfo<v8::Value>& info, ExceptionState& exceptionState)
+{
+    TestObject* impl = V8TestObject::toImpl(info.Holder());
+    DOMWindow* arg1;
+    double arg2;
+    {
+        arg1 = toDOMWindow(info.GetIsolate(), info[0]);
+        TONATIVE_CONVERT(convertAndCheck(arg2 = toDouble(info[1], exceptionState), exceptionState), return);
+    }
+    v8SetReturnValue(info, impl->promiseOverloadMethod(arg1, arg2).v8Value());
+}
+
 static void promiseOverloadMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "promiseOverloadMethod", "TestObject", info.Holder(), info.GetIsolate());
+    promiseOverloadMethod2MethodPromise(info, exceptionState);
+    if (exceptionState.hadException())
+        v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
+}
+
+static void promiseOverloadMethod3MethodPromise(const v8::FunctionCallbackInfo<v8::Value>& info, ExceptionState& exceptionState)
+{
     TestObject* impl = V8TestObject::toImpl(info.Holder());
-    DOMWindow* arg1;
+    Document* arg1;
     double arg2;
     {
-        arg1 = toDOMWindow(info.GetIsolate(), info[0]);
-        TONATIVE_VOID_EXCEPTIONSTATE_PROMISE_INTERNAL(arg2, toDouble(info[1], exceptionState), exceptionState, info, ScriptState::current(info.GetIsolate()));
+        arg1 = V8Document::toImplWithTypeCheck(info.GetIsolate(), info[0]);
+        TONATIVE_CONVERT(convertAndCheck(arg2 = toDouble(info[1], exceptionState), exceptionState), return);
     }
     v8SetReturnValue(info, impl->promiseOverloadMethod(arg1, arg2).v8Value());
 }
 
 static void promiseOverloadMethod3Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "promiseOverloadMethod", "TestObject", info.Holder(), info.GetIsolate());
-    TestObject* impl = V8TestObject::toImpl(info.Holder());
-    Document* arg1;
-    double arg2;
-    {
-        arg1 = V8Document::toImplWithTypeCheck(info.GetIsolate(), info[0]);
-        TONATIVE_VOID_EXCEPTIONSTATE_PROMISE_INTERNAL(arg2, toDouble(info[1], exceptionState), exceptionState, info, ScriptState::current(info.GetIsolate()));
-    }
-    v8SetReturnValue(info, impl->promiseOverloadMethod(arg1, arg2).v8Value());
+    promiseOverloadMethod3MethodPromise(info, exceptionState);
+    if (exceptionState.hadException())
+        v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
 }
 
 static void promiseOverloadMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "promiseOverloadMethod", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(2, info.Length())) {
     case 0:
         if (true) {
             promiseOverloadMethod1Method(info);
             return;
@@ skipping 12 matching lines @@
     default:
         if (info.Length() >= 0) {
             setArityTypeError(exceptionState, "[0, 2]", info.Length());
             v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
             return;
         }
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     v8SetReturnValue(info, exceptionState.reject(ScriptState::current(info.GetIsolate())).v8Value());
+    return;
 }
 
 static void promiseOverloadMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::promiseOverloadMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedPerWorldBindingsMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     impl->overloadedPerWorldBindingsMethod();
 }
 
 static void overloadedPerWorldBindingsMethod1MethodForMainWorld(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     impl->overloadedPerWorldBindingsMethod();
 }
 
 static void overloadedPerWorldBindingsMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedPerWorldBindingsMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedPerWorldBindingsMethod(longArg);
 }
 
 static void overloadedPerWorldBindingsMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedPerWorldBindingsMethod", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
             overloadedPerWorldBindingsMethod1Method(info);
             return;
         }
         break;
     case 1:
         if (true) {
             overloadedPerWorldBindingsMethod2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedPerWorldBindingsMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedPerWorldBindingsMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedPerWorldBindingsMethod2MethodForMainWorld(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedPerWorldBindingsMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->overloadedPerWorldBindingsMethod(longArg);
 }
 
 static void overloadedPerWorldBindingsMethodMethodForMainWorld(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedPerWorldBindingsMethod", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
             overloadedPerWorldBindingsMethod1MethodForMainWorld(info);
             return;
         }
         break;
     case 1:
         if (true) {
             overloadedPerWorldBindingsMethod2MethodForMainWorld(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedPerWorldBindingsMethodMethodCallbackForMainWorld(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedPerWorldBindingsMethodMethodForMainWorld(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void overloadedStaticMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedStaticMethod", "TestObject", info.Holder(), info.GetIsolate());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     TestObject::overloadedStaticMethod(longArg);
 }
 
 static void overloadedStaticMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedStaticMethod", "TestObject", info.Holder(), info.GetIsolate());
     int longArg1;
     int longArg2;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg1, toInt32(info[0], exceptionState), exceptionState);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg2, toInt32(info[1], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg1 = toInt32(info[0], exceptionState), exceptionState), return);
+        TONATIVE_CONVERT(convertAndThrow(longArg2 = toInt32(info[1], exceptionState), exceptionState), return);
     }
     TestObject::overloadedStaticMethod(longArg1, longArg2);
 }
 
 static void overloadedStaticMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "overloadedStaticMethod", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(2, info.Length())) {
     case 1:
         if (true) {
@@ skipping 10 matching lines @@
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void overloadedStaticMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::overloadedStaticMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodClampUnsignedShortArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodClampUnsignedShortArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     unsigned clampUnsignedShortArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(clampUnsignedShortArg, toUInt16(info[0], Clamp, exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(clampUnsignedShortArg = toUInt16(info[0], Clamp, exceptionState), exceptionState), return);
     }
     impl->voidMethodClampUnsignedShortArg(clampUnsignedShortArg);
 }
 
 static void voidMethodClampUnsignedShortArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodClampUnsignedShortArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodClampUnsignedLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodClampUnsignedLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     unsigned clampUnsignedLongArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(clampUnsignedLongArg, toUInt32(info[0], Clamp, exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(clampUnsignedLongArg = toUInt32(info[0], Clamp, exceptionState), exceptionState), return);
     }
     impl->voidMethodClampUnsignedLongArg(clampUnsignedLongArg);
 }
 
 static void voidMethodClampUnsignedLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodClampUnsignedLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 14 matching lines @@
     TestObjectV8Internal::voidMethodDefaultUndefinedTestInterfaceEmptyArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDefaultUndefinedLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodDefaultUndefinedLongArg", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int defaultUndefinedLongArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(defaultUndefinedLongArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(defaultUndefinedLongArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->voidMethodDefaultUndefinedLongArg(defaultUndefinedLongArg);
 }
 
 static void voidMethodDefaultUndefinedLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultUndefinedLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodDefaultUndefinedStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> defaultUndefinedStringArg;
     {
-        TOSTRING_VOID_INTERNAL(defaultUndefinedStringArg, info[0]);
+        TONATIVE_CONVERT((defaultUndefinedStringArg = info[0]).prepare(), return);
     }
     impl->voidMethodDefaultUndefinedStringArg(defaultUndefinedStringArg);
 }
 
 static void voidMethodDefaultUndefinedStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultUndefinedStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodEnforceRangeLongArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodEnforceRangeLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int enforceRangeLongArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(enforceRangeLongArg, toInt32(info[0], EnforceRange, exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(enforceRangeLongArg = toInt32(info[0], EnforceRange, exceptionState), exceptionState), return);
     }
     impl->voidMethodEnforceRangeLongArg(enforceRangeLongArg);
 }
 
 static void voidMethodEnforceRangeLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodEnforceRangeLongArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodTreatNullAsEmptyStringStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "voidMethodTreatNullAsEmptyStringStringArg", "TestObject", 1, info.Length()), info.GetIsolate());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<TreatNullAsEmptyString> treatNullAsEmptyStringStringArg;
     {
-        TOSTRING_VOID_INTERNAL(treatNullAsEmptyStringStringArg, info[0]);
+        TONATIVE_CONVERT((treatNullAsEmptyStringStringArg = info[0]).prepare(), return);
     }
     impl->voidMethodTreatNullAsEmptyStringStringArg(treatNullAsEmptyStringStringArg);
 }
 
 static void voidMethodTreatNullAsEmptyStringStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodTreatNullAsEmptyStringStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodTreatNullAsNullStringStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "voidMethodTreatNullAsNullStringStringArg", "TestObject", 1, info.Length()), info.GetIsolate());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<TreatNullAsNullString> treatNullAsNullStringStringArg;
     {
-        TOSTRING_VOID_INTERNAL(treatNullAsNullStringStringArg, info[0]);
+        TONATIVE_CONVERT((treatNullAsNullStringStringArg = info[0]).prepare(), return);
     }
     impl->voidMethodTreatNullAsNullStringStringArg(treatNullAsNullStringStringArg);
 }
 
 static void voidMethodTreatNullAsNullStringStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodTreatNullAsNullStringStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodTreatNullAsNullStringTreatUndefinedAsNullStringStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "voidMethodTreatNullAsNullStringTreatUndefinedAsNullStringStringArg", "TestObject", 1, info.Length()), info.GetIsolate());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<TreatNullAndUndefinedAsNullString> treatNullAsNullStringStringArg;
     {
-        TOSTRING_VOID_INTERNAL(treatNullAsNullStringStringArg, info[0]);
+        TONATIVE_CONVERT((treatNullAsNullStringStringArg = info[0]).prepare(), return);
     }
     impl->voidMethodTreatNullAsNullStringTreatUndefinedAsNullStringStringArg(treatNullAsNullStringStringArg);
 }
 
 static void voidMethodTreatNullAsNullStringTreatUndefinedAsNullStringStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodTreatNullAsNullStringTreatUndefinedAsNullStringStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 282 matching lines @@
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     impl->DeprecateAsOverloadedMethod();
 }
 
 static void DeprecateAsOverloadedMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "DeprecateAsOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->DeprecateAsOverloadedMethod(arg);
 }
 
 static void DeprecateAsOverloadedMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "DeprecateAsOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
             UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureA);
             DeprecateAsOverloadedMethod1Method(info);
             return;
         }
         break;
     case 1:
         if (true) {
             UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureB);
             DeprecateAsOverloadedMethod2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void DeprecateAsOverloadedMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::DeprecateAsOverloadedMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void DeprecateAsSameValueOverloadedMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     impl->DeprecateAsSameValueOverloadedMethod();
 }
 
 static void DeprecateAsSameValueOverloadedMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "DeprecateAsSameValueOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->DeprecateAsSameValueOverloadedMethod(arg);
 }
 
 static void DeprecateAsSameValueOverloadedMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "DeprecateAsSameValueOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeature);
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
             DeprecateAsSameValueOverloadedMethod1Method(info);
             return;
         }
         break;
     case 1:
         if (true) {
             DeprecateAsSameValueOverloadedMethod2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void DeprecateAsSameValueOverloadedMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::DeprecateAsSameValueOverloadedMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void measureAsOverloadedMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     impl->measureAsOverloadedMethod();
 }
 
 static void measureAsOverloadedMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "measureAsOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->measureAsOverloadedMethod(arg);
 }
 
 static void measureAsOverloadedMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "measureAsOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
             UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureA);
             measureAsOverloadedMethod1Method(info);
             return;
         }
         break;
     case 1:
         if (true) {
             UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureB);
             measureAsOverloadedMethod2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void measureAsOverloadedMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::measureAsOverloadedMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void measureAsSameValueOverloadedMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     impl->measureAsSameValueOverloadedMethod();
 }
 
 static void measureAsSameValueOverloadedMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "measureAsSameValueOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->measureAsSameValueOverloadedMethod(arg);
 }
 
 static void measureAsSameValueOverloadedMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "measureAsSameValueOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeature);
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
             measureAsSameValueOverloadedMethod1Method(info);
             return;
         }
         break;
     case 1:
         if (true) {
             measureAsSameValueOverloadedMethod2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void measureAsSameValueOverloadedMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::measureAsSameValueOverloadedMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void deprecateAsMeasureAsSameValueOverloadedMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     impl->deprecateAsMeasureAsSameValueOverloadedMethod();
 }
 
 static void deprecateAsMeasureAsSameValueOverloadedMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "deprecateAsMeasureAsSameValueOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->deprecateAsMeasureAsSameValueOverloadedMethod(arg);
 }
 
 static void deprecateAsMeasureAsSameValueOverloadedMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "deprecateAsMeasureAsSameValueOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeature);
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
             UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureA);
             deprecateAsMeasureAsSameValueOverloadedMethod1Method(info);
             return;
         }
         break;
     case 1:
         if (true) {
             UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureB);
             deprecateAsMeasureAsSameValueOverloadedMethod2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void deprecateAsMeasureAsSameValueOverloadedMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::deprecateAsMeasureAsSameValueOverloadedMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void deprecateAsSameValueMeasureAsOverloadedMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     impl->deprecateAsSameValueMeasureAsOverloadedMethod();
 }
 
 static void deprecateAsSameValueMeasureAsOverloadedMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "deprecateAsSameValueMeasureAsOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->deprecateAsSameValueMeasureAsOverloadedMethod(arg);
 }
 
 static void deprecateAsSameValueMeasureAsOverloadedMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "deprecateAsSameValueMeasureAsOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeature);
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
             UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureA);
             deprecateAsSameValueMeasureAsOverloadedMethod1Method(info);
             return;
         }
         break;
     case 1:
         if (true) {
             UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureB);
             deprecateAsSameValueMeasureAsOverloadedMethod2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void deprecateAsSameValueMeasureAsOverloadedMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::deprecateAsSameValueMeasureAsOverloadedMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void deprecateAsSameValueMeasureAsSameValueOverloadedMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     impl->deprecateAsSameValueMeasureAsSameValueOverloadedMethod();
 }
 
 static void deprecateAsSameValueMeasureAsSameValueOverloadedMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "deprecateAsSameValueMeasureAsSameValueOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int arg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(arg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(arg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->deprecateAsSameValueMeasureAsSameValueOverloadedMethod(arg);
 }
 
 static void deprecateAsSameValueMeasureAsSameValueOverloadedMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "deprecateAsSameValueMeasureAsSameValueOverloadedMethod", "TestObject", info.Holder(), info.GetIsolate());
     UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureB);
     UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::TestFeatureA);
     switch (std::min(1, info.Length())) {
     case 0:
         if (true) {
             deprecateAsSameValueMeasureAsSameValueOverloadedMethod1Method(info);
             return;
         }
         break;
     case 1:
         if (true) {
             deprecateAsSameValueMeasureAsSameValueOverloadedMethod2Method(info);
             return;
         }
         break;
     default:
         break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void deprecateAsSameValueMeasureAsSameValueOverloadedMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::deprecateAsSameValueMeasureAsSameValueOverloadedMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void notEnumerableVoidMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
@@ skipping 207 matching lines @@
     int optionalLongArg;
     {
         if (UNLIKELY(info.Length() <= 0)) {
             impl->raisesExceptionVoidMethodOptionalLongArg(exceptionState);
             if (exceptionState.hadException()) {
                 exceptionState.throwIfNeeded();
                 return;
             }
             return;
         }
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(optionalLongArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(optionalLongArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->raisesExceptionVoidMethodOptionalLongArg(optionalLongArg, exceptionState);
     if (exceptionState.hadException()) {
         exceptionState.throwIfNeeded();
         return;
     }
 }
 
 static void raisesExceptionVoidMethodOptionalLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
@@ skipping 88 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "callWithExecutionContextRaisesExceptionVoidMethodLongArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     ExecutionContext* executionContext = currentExecutionContext(info.GetIsolate());
     impl->callWithExecutionContextRaisesExceptionVoidMethodLongArg(executionContext, longArg, exceptionState);
     if (exceptionState.hadException()) {
         exceptionState.throwIfNeeded();
         return;
     }
 }
 
 static void callWithExecutionContextRaisesExceptionVoidMethodLongArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
@@ skipping 40 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::perWorldBindingsRuntimeEnabledVoidMethodMethodForMainWorld(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void runtimeEnabledOverloadedVoidMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
     }
     impl->runtimeEnabledOverloadedVoidMethod(stringArg);
 }
 
 static void runtimeEnabledOverloadedVoidMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "runtimeEnabledOverloadedVoidMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
     }
     impl->runtimeEnabledOverloadedVoidMethod(longArg);
 }
 
 static void runtimeEnabledOverloadedVoidMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "runtimeEnabledOverloadedVoidMethod", "TestObject", info.Holder(), info.GetIsolate());
     switch (std::min(1, info.Length())) {
     case 1:
         if (info[0]->IsNumber()) {
@@ skipping 12 matching lines @@
     default:
         break;
     }
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void runtimeEnabledOverloadedVoidMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::runtimeEnabledOverloadedVoidMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void partiallyRuntimeEnabledOverloadedVoidMethod1Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> stringArg;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+        TONATIVE_CONVERT((stringArg = info[0]).prepare(), return);
     }
     impl->partiallyRuntimeEnabledOverloadedVoidMethod(stringArg);
 }
 
 static void partiallyRuntimeEnabledOverloadedVoidMethod2Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     TestInterfaceImplementation* testInterface;
     {
         testInterface = V8TestInterface::toImplWithTypeCheck(info.GetIsolate(), info[0]);
     }
     impl->partiallyRuntimeEnabledOverloadedVoidMethod(testInterface);
 }
 
 static void partiallyRuntimeEnabledOverloadedVoidMethod3Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "partiallyRuntimeEnabledOverloadedVoidMethod", "TestObject", info.Holder(), info.GetIsolate());
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int longArg;
     V8StringResource<> stringArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(longArg, toInt32(info[0], exceptionState), exceptionState);
-        TOSTRING_VOID_INTERNAL(stringArg, info[1]);
+        TONATIVE_CONVERT(convertAndThrow(longArg = toInt32(info[0], exceptionState), exceptionState), return);
+        TONATIVE_CONVERT((stringArg = info[1]).prepare(), return);
     }
     impl->partiallyRuntimeEnabledOverloadedVoidMethod(longArg, stringArg);
 }
 
 static int partiallyRuntimeEnabledOverloadedVoidMethodMethodLength()
 {
     if (RuntimeEnabledFeatures::featureName1Enabled()) {
         return 1;
     }
     if (RuntimeEnabledFeatures::featureName2Enabled()) {
@@ skipping 29 matching lines @@
     default:
         break;
     }
     if (info.Length() < TestObjectV8Internal::partiallyRuntimeEnabledOverloadedVoidMethodMethodLength()) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(TestObjectV8Internal::partiallyRuntimeEnabledOverloadedVoidMethodMethodLength(), info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
+    return;
 }
 
 static void partiallyRuntimeEnabledOverloadedVoidMethodMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::partiallyRuntimeEnabledOverloadedVoidMethodMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void treatReturnedNullStringAsNullStringMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
@@ skipping 226 matching lines @@
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "typeCheckingUnrestrictedVoidMethodFloatArgDoubleArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 2)) {
         setMinimumArityTypeError(exceptionState, 2, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     float floatArg;
     double doubleArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(floatArg, toRestrictedFloat(info[0], exceptionState), exceptionState);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(doubleArg, toRestrictedDouble(info[1], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(floatArg = toRestrictedFloat(info[0], exceptionState), exceptionState), return);
+        TONATIVE_CONVERT(convertAndThrow(doubleArg = toRestrictedDouble(info[1], exceptionState), exceptionState), return);
     }
     impl->typeCheckingUnrestrictedVoidMethodFloatArgDoubleArg(floatArg, doubleArg);
 }
 
 static void typeCheckingUnrestrictedVoidMethodFloatArgDoubleArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::typeCheckingUnrestrictedVoidMethodFloatArgDoubleArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 15 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodTestInterfaceGarbageCollectedSequenceArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     HeapVector<Member<TestInterfaceGarbageCollected>> testInterfaceGarbageCollectedSequenceArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(testInterfaceGarbageCollectedSequenceArg, (toMemberNativeArray<TestInterfaceGarbageCollected, V8TestInterfaceGarbageCollected>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(testInterfaceGarbageCollectedSequenceArg = (toMemberNativeArray<TestInterfaceGarbageCollected, V8TestInterfaceGarbageCollected>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState), return);
     }
     impl->voidMethodTestInterfaceGarbageCollectedSequenceArg(testInterfaceGarbageCollectedSequenceArg);
 }
 
 static void voidMethodTestInterfaceGarbageCollectedSequenceArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodTestInterfaceGarbageCollectedSequenceArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodTestInterfaceGarbageCollectedArrayArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodTestInterfaceGarbageCollectedArrayArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     HeapVector<Member<TestInterfaceGarbageCollected>> testInterfaceGarbageCollectedArrayArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(testInterfaceGarbageCollectedArrayArg, (toMemberNativeArray<TestInterfaceGarbageCollected, V8TestInterfaceGarbageCollected>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(testInterfaceGarbageCollectedArrayArg = (toMemberNativeArray<TestInterfaceGarbageCollected, V8TestInterfaceGarbageCollected>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState), return);
     }
     impl->voidMethodTestInterfaceGarbageCollectedArrayArg(testInterfaceGarbageCollectedArrayArg);
 }
 
 static void voidMethodTestInterfaceGarbageCollectedArrayArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodTestInterfaceGarbageCollectedArrayArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodTestInterfaceWillBeGarbageCollectedSequenceArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodTestInterfaceWillBeGarbageCollectedSequenceArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     WillBeHeapVector<RefPtrWillBeMember<TestInterfaceWillBeGarbageCollected>> testInterfaceWillBeGarbageCollectedSequenceArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(testInterfaceWillBeGarbageCollectedSequenceArg, (toRefPtrWillBeMemberNativeArray<TestInterfaceWillBeGarbageCollected, V8TestInterfaceWillBeGarbageCollected>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(testInterfaceWillBeGarbageCollectedSequenceArg = (toRefPtrWillBeMemberNativeArray<TestInterfaceWillBeGarbageCollected, V8TestInterfaceWillBeGarbageCollected>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState), return);
     }
     impl->voidMethodTestInterfaceWillBeGarbageCollectedSequenceArg(testInterfaceWillBeGarbageCollectedSequenceArg);
 }
 
 static void voidMethodTestInterfaceWillBeGarbageCollectedSequenceArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodTestInterfaceWillBeGarbageCollectedSequenceArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodTestInterfaceWillBeGarbageCollectedArrayArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "voidMethodTestInterfaceWillBeGarbageCollectedArrayArg", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     WillBeHeapVector<RefPtrWillBeMember<TestInterfaceWillBeGarbageCollected>> testInterfaceWillBeGarbageCollectedArrayArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(testInterfaceWillBeGarbageCollectedArrayArg, (toRefPtrWillBeMemberNativeArray<TestInterfaceWillBeGarbageCollected, V8TestInterfaceWillBeGarbageCollected>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(testInterfaceWillBeGarbageCollectedArrayArg = (toRefPtrWillBeMemberNativeArray<TestInterfaceWillBeGarbageCollected, V8TestInterfaceWillBeGarbageCollected>(info[0], 1, info.GetIsolate(), exceptionState)), exceptionState), return);
     }
     impl->voidMethodTestInterfaceWillBeGarbageCollectedArrayArg(testInterfaceWillBeGarbageCollectedArrayArg);
 }
 
 static void voidMethodTestInterfaceWillBeGarbageCollectedArrayArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodTestInterfaceWillBeGarbageCollectedArrayArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 31 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "shortMethodWithShortArgumentImplementedInPrivateScript", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int value;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(value, toInt16(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(value = toInt16(info[0], exceptionState), exceptionState), return);
     }
     int result = 0;
     if (!V8TestObject::PrivateScript::shortMethodWithShortArgumentImplementedInPrivateScriptMethod(toLocalFrame(toFrameIfNotDetached(info.GetIsolate()->GetCurrentContext())), impl, value, &result))
         return;
     v8SetReturnValueInt(info, result);
 }
 
 static void shortMethodWithShortArgumentImplementedInPrivateScriptMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::shortMethodWithShortArgumentImplementedInPrivateScriptMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void stringMethodWithStringArgumentImplementedInPrivateScriptMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "stringMethodWithStringArgumentImplementedInPrivateScript", "TestObject", 1, info.Length()), info.GetIsolate());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     V8StringResource<> value;
     {
-        TOSTRING_VOID_INTERNAL(value, info[0]);
+        TONATIVE_CONVERT((value = info[0]).prepare(), return);
     }
     String result;
     if (!V8TestObject::PrivateScript::stringMethodWithStringArgumentImplementedInPrivateScriptMethod(toLocalFrame(toFrameIfNotDetached(info.GetIsolate()->GetCurrentContext())), impl, value, &result))
         return;
     v8SetReturnValueString(info, result, info.GetIsolate());
 }
 
 static void stringMethodWithStringArgumentImplementedInPrivateScriptMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
@@ skipping 35 matching lines @@
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     Document* document;
     Node* node;
     int value1;
     double value2;
     V8StringResource<> string;
     {
         document = V8Document::toImplWithTypeCheck(info.GetIsolate(), info[0]);
         node = V8Node::toImplWithTypeCheck(info.GetIsolate(), info[1]);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(value1, toInt16(info[2], exceptionState), exceptionState);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(value2, toDouble(info[3], exceptionState), exceptionState);
-        TOSTRING_VOID_INTERNAL(string, info[4]);
+        TONATIVE_CONVERT(convertAndThrow(value1 = toInt16(info[2], exceptionState), exceptionState), return);
+        TONATIVE_CONVERT(convertAndThrow(value2 = toDouble(info[3], exceptionState), exceptionState), return);
+        TONATIVE_CONVERT((string = info[4]).prepare(), return);
     }
     RefPtrWillBeRawPtr<Node> result = nullptr;
     if (!V8TestObject::PrivateScript::nodeMethodWithVariousArgumentsImplementedInPrivateScriptMethod(toLocalFrame(toFrameIfNotDetached(info.GetIsolate()->GetCurrentContext())), impl, document, node, value1, value2, string, &result))
         return;
     v8SetReturnValue(info, result.release());
 }
 
 static void nodeMethodWithVariousArgumentsImplementedInPrivateScriptMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::nodeMethodWithVariousArgumentsImplementedInPrivateScriptMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void methodImplementedInCPPForPrivateScriptOnlyMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "methodImplementedInCPPForPrivateScriptOnly", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 2)) {
         setMinimumArityTypeError(exceptionState, 2, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int value1;
     int value2;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(value1, toInt16(info[0], exceptionState), exceptionState);
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(value2, toInt16(info[1], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(value1 = toInt16(info[0], exceptionState), exceptionState), return);
+        TONATIVE_CONVERT(convertAndThrow(value2 = toInt16(info[1], exceptionState), exceptionState), return);
     }
     v8SetReturnValueInt(info, impl->methodImplementedInCPPForPrivateScriptOnly(value1, value2));
 }
 
 static void methodImplementedInCPPForPrivateScriptOnlyMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::methodImplementedInCPPForPrivateScriptOnlyMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
@@ skipping 65 matching lines @@
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     ScriptValue callback;
     ScriptValue thisArg;
     {
         if (!info[0]->IsFunction()) {
             exceptionState.throwTypeError("The callback provided as parameter 1 is not a function.");
-                exceptionState.throwIfNeeded();
+            exceptionState.throwIfNeeded();
             return;
         }
         callback = ScriptValue(ScriptState::current(info.GetIsolate()), info[0]);
         thisArg = ScriptValue(ScriptState::current(info.GetIsolate()), info[1]);
     }
     ScriptState* scriptState = ScriptState::current(info.GetIsolate());
     impl->forEachForBinding(scriptState, ScriptValue(scriptState, info.This()), callback, thisArg, exceptionState);
     if (exceptionState.hadException()) {
         exceptionState.throwIfNeeded();
         return;
@@ skipping 11 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "has", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int key;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(key, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(key = toInt32(info[0], exceptionState), exceptionState), return);
     }
     ScriptState* scriptState = ScriptState::current(info.GetIsolate());
     bool result = impl->hasForBinding(scriptState, key, exceptionState);
     if (exceptionState.hadException()) {
         exceptionState.throwIfNeeded();
         return;
     }
     v8SetReturnValueBool(info, result);
 }
 
 static void hasMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::hasMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void getMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "get", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int key;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(key, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(key = toInt32(info[0], exceptionState), exceptionState), return);
     }
     ScriptState* scriptState = ScriptState::current(info.GetIsolate());
     ScriptValue result = impl->getForBinding(scriptState, key, exceptionState);
     if (exceptionState.hadException()) {
         exceptionState.throwIfNeeded();
         return;
     }
     v8SetReturnValue(info, result.v8Value());
 }
 
@@ skipping 27 matching lines @@
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "delete", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 1)) {
         setMinimumArityTypeError(exceptionState, 1, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int key;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(key, toInt32(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(key = toInt32(info[0], exceptionState), exceptionState), return);
     }
     ScriptState* scriptState = ScriptState::current(info.GetIsolate());
     bool result = impl->deleteForBinding(scriptState, key, exceptionState);
     if (exceptionState.hadException()) {
         exceptionState.throwIfNeeded();
         return;
     }
     v8SetReturnValueBool(info, result);
 }
 
 static void deleteMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::deleteMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void setMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "set", "TestObject", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 2)) {
         setMinimumArityTypeError(exceptionState, 2, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     int key;
     StringOrDouble value;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(key, toInt32(info[0], exceptionState), exceptionState);
-        TONATIVE_VOID_EXCEPTIONSTATE_ARGINTERNAL(V8StringOrDouble::toImpl(info.GetIsolate(), info[1], value, exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(key = toInt32(info[0], exceptionState), exceptionState), return);
+        TONATIVE_CONVERT(V8StringOrDouble::toImpl(info.GetIsolate(), info[1], value, exceptionState), return exceptionState.throwException());
     }
     ScriptState* scriptState = ScriptState::current(info.GetIsolate());
     RefPtr<TestObject> result = impl->setForBinding(scriptState, key, value, exceptionState);
     if (exceptionState.hadException()) {
         exceptionState.throwIfNeeded();
         return;
     }
     v8SetReturnValue(info, result.release());
 }
 
@@ skipping 677 matching lines @@
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     v8::Local<v8::Value> *argv = 0;
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "shortMethodImplementedInPrivateScript", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     v8::Local<v8::Value> v8Value = PrivateScriptRunner::runDOMMethod(scriptState, scriptStateInUserScript, "TestObject", "shortMethodImplementedInPrivateScript", holder, 0, argv);
     if (v8Value.IsEmpty())
         return false;
-    TONATIVE_DEFAULT_EXCEPTIONSTATE(int, cppValue, toInt16(v8Value, exceptionState), exceptionState, false);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt16(v8Value, exceptionState), exceptionState), return false);
     *result = cppValue;
     RELEASE_ASSERT(!exceptionState.hadException());
     return true;
 }
 
 bool V8TestObject::PrivateScript::shortMethodWithShortArgumentImplementedInPrivateScriptMethod(LocalFrame* frame, TestObject* holderImpl, int value, int* result)
 {
     if (!frame)
         return false;
     v8::HandleScope handleScope(toIsolate(frame));
     ScriptForbiddenScope::AllowUserAgentScript script;
     v8::Local<v8::Context> contextInPrivateScript = toV8Context(frame, DOMWrapperWorld::privateScriptIsolatedWorld());
     if (contextInPrivateScript.IsEmpty())
         return false;
     ScriptState* scriptState = ScriptState::from(contextInPrivateScript);
     ScriptState* scriptStateInUserScript = ScriptState::forMainWorld(frame);
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     v8::Local<v8::Value> valueHandle = v8::Integer::New(scriptState->isolate(), value);
     v8::Local<v8::Value> argv[] = { valueHandle };
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "shortMethodWithShortArgumentImplementedInPrivateScript", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     v8::Local<v8::Value> v8Value = PrivateScriptRunner::runDOMMethod(scriptState, scriptStateInUserScript, "TestObject", "shortMethodWithShortArgumentImplementedInPrivateScript", holder, 1, argv);
     if (v8Value.IsEmpty())
         return false;
-    TONATIVE_DEFAULT_EXCEPTIONSTATE(int, cppValue, toInt16(v8Value, exceptionState), exceptionState, false);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt16(v8Value, exceptionState), exceptionState), return false);
     *result = cppValue;
     RELEASE_ASSERT(!exceptionState.hadException());
     return true;
 }
 
 bool V8TestObject::PrivateScript::stringMethodWithStringArgumentImplementedInPrivateScriptMethod(LocalFrame* frame, TestObject* holderImpl, String value, String* result)
 {
     if (!frame)
         return false;
     v8::HandleScope handleScope(toIsolate(frame));
     ScriptForbiddenScope::AllowUserAgentScript script;
     v8::Local<v8::Context> contextInPrivateScript = toV8Context(frame, DOMWrapperWorld::privateScriptIsolatedWorld());
     if (contextInPrivateScript.IsEmpty())
         return false;
     ScriptState* scriptState = ScriptState::from(contextInPrivateScript);
     ScriptState* scriptStateInUserScript = ScriptState::forMainWorld(frame);
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     v8::Local<v8::Value> valueHandle = v8String(scriptState->isolate(), value);
     v8::Local<v8::Value> argv[] = { valueHandle };
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "stringMethodWithStringArgumentImplementedInPrivateScript", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     v8::Local<v8::Value> v8Value = PrivateScriptRunner::runDOMMethod(scriptState, scriptStateInUserScript, "TestObject", "stringMethodWithStringArgumentImplementedInPrivateScript", holder, 1, argv);
     if (v8Value.IsEmpty())
         return false;
-    TOSTRING_DEFAULT(V8StringResource<>, cppValue, v8Value, false);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return false);
     *result = cppValue;
     RELEASE_ASSERT(!exceptionState.hadException());
     return true;
 }
 
 bool V8TestObject::PrivateScript::nodeMethodWithNodeArgumentImplementedInPrivateScriptMethod(LocalFrame* frame, TestObject* holderImpl, PassRefPtrWillBeRawPtr<Node> value, RefPtrWillBeRawPtr<Node>* result)
 {
     if (!frame)
         return false;
     v8::HandleScope handleScope(toIsolate(frame));
@@ skipping 71 matching lines @@
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     v8::Local<v8::Value> value1Handle = v8::Integer::New(scriptState->isolate(), value1);
     v8::Local<v8::Value> value2Handle = v8::Integer::New(scriptState->isolate(), value2);
     v8::Local<v8::Value> argv[] = { value1Handle, value2Handle };
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "methodForPrivateScriptOnly", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     v8::Local<v8::Value> v8Value = PrivateScriptRunner::runDOMMethod(scriptState, scriptStateInUserScript, "TestObject", "methodForPrivateScriptOnly", holder, 2, argv);
     if (v8Value.IsEmpty())
         return false;
-    TONATIVE_DEFAULT_EXCEPTIONSTATE(int, cppValue, toInt16(v8Value, exceptionState), exceptionState, false);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt16(v8Value, exceptionState), exceptionState), return false);
     *result = cppValue;
     RELEASE_ASSERT(!exceptionState.hadException());
     return true;
 }
 
 bool V8TestObject::PrivateScript::readonlyShortAttributeAttributeGetter(LocalFrame* frame, TestObject* holderImpl, int* result)
 {
     if (!frame)
         return false;
     v8::HandleScope handleScope(toIsolate(frame));
     ScriptForbiddenScope::AllowUserAgentScript script;
     v8::Local<v8::Context> contextInPrivateScript = toV8Context(frame, DOMWrapperWorld::privateScriptIsolatedWorld());
     if (contextInPrivateScript.IsEmpty())
         return false;
     ScriptState* scriptState = ScriptState::from(contextInPrivateScript);
     ScriptState* scriptStateInUserScript = ScriptState::forMainWorld(frame);
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     ExceptionState exceptionState(ExceptionState::GetterContext, "readonlyShortAttribute", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     v8::Local<v8::Value> v8Value = PrivateScriptRunner::runDOMAttributeGetter(scriptState, scriptStateInUserScript, "TestObject", "readonlyShortAttribute", holder);
     if (v8Value.IsEmpty())
         return false;
-    TONATIVE_DEFAULT_EXCEPTIONSTATE(int, cppValue, toInt16(v8Value, exceptionState), exceptionState, false);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt16(v8Value, exceptionState), exceptionState), return false);
     RELEASE_ASSERT(!exceptionState.hadException());
     *result = cppValue;
     return true;
 }
 
 bool V8TestObject::PrivateScript::shortAttributeAttributeGetter(LocalFrame* frame, TestObject* holderImpl, int* result)
 {
     if (!frame)
         return false;
     v8::HandleScope handleScope(toIsolate(frame));
     ScriptForbiddenScope::AllowUserAgentScript script;
     v8::Local<v8::Context> contextInPrivateScript = toV8Context(frame, DOMWrapperWorld::privateScriptIsolatedWorld());
     if (contextInPrivateScript.IsEmpty())
         return false;
     ScriptState* scriptState = ScriptState::from(contextInPrivateScript);
     ScriptState* scriptStateInUserScript = ScriptState::forMainWorld(frame);
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     ExceptionState exceptionState(ExceptionState::GetterContext, "shortAttribute", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     v8::Local<v8::Value> v8Value = PrivateScriptRunner::runDOMAttributeGetter(scriptState, scriptStateInUserScript, "TestObject", "shortAttribute", holder);
     if (v8Value.IsEmpty())
         return false;
-    TONATIVE_DEFAULT_EXCEPTIONSTATE(int, cppValue, toInt16(v8Value, exceptionState), exceptionState, false);
+    TONATIVE_DECLARE(int, cppValue, convertAndThrow(cppValue = toInt16(v8Value, exceptionState), exceptionState), return false);
     RELEASE_ASSERT(!exceptionState.hadException());
     *result = cppValue;
     return true;
 }
 
 bool V8TestObject::PrivateScript::shortAttributeAttributeSetter(LocalFrame* frame, TestObject* holderImpl, int cppValue)
 {
     if (!frame)
         return false;
     v8::HandleScope handleScope(toIsolate(frame));
@@ skipping 27 matching lines @@
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     ExceptionState exceptionState(ExceptionState::GetterContext, "stringAttribute", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     v8::Local<v8::Value> v8Value = PrivateScriptRunner::runDOMAttributeGetter(scriptState, scriptStateInUserScript, "TestObject", "stringAttribute", holder);
     if (v8Value.IsEmpty())
         return false;
-    TOSTRING_DEFAULT(V8StringResource<>, cppValue, v8Value, false);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return false);
     RELEASE_ASSERT(!exceptionState.hadException());
     *result = cppValue;
     return true;
 }
 
 bool V8TestObject::PrivateScript::stringAttributeAttributeSetter(LocalFrame* frame, TestObject* holderImpl, String cppValue)
 {
     if (!frame)
         return false;
     v8::HandleScope handleScope(toIsolate(frame));
@@ skipping 75 matching lines @@
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     ExceptionState exceptionState(ExceptionState::GetterContext, "attributeForPrivateScriptOnly", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     v8::Local<v8::Value> v8Value = PrivateScriptRunner::runDOMAttributeGetter(scriptState, scriptStateInUserScript, "TestObject", "attributeForPrivateScriptOnly", holder);
     if (v8Value.IsEmpty())
         return false;
-    TOSTRING_DEFAULT(V8StringResource<>, cppValue, v8Value, false);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return false);
     RELEASE_ASSERT(!exceptionState.hadException());
     *result = cppValue;
     return true;
 }
 
 bool V8TestObject::PrivateScript::attributeForPrivateScriptOnlyAttributeSetter(LocalFrame* frame, TestObject* holderImpl, String cppValue)
 {
     if (!frame)
         return false;
     v8::HandleScope handleScope(toIsolate(frame));
@@ skipping 27 matching lines @@
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     ExceptionState exceptionState(ExceptionState::GetterContext, "enumForPrivateScript", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     v8::Local<v8::Value> v8Value = PrivateScriptRunner::runDOMAttributeGetter(scriptState, scriptStateInUserScript, "TestObject", "enumForPrivateScript", holder);
     if (v8Value.IsEmpty())
         return false;
-    TOSTRING_DEFAULT(V8StringResource<>, cppValue, v8Value, false);
+    TONATIVE_DECLARE(V8StringResource<>, cppValue, (cppValue = v8Value).prepare(), return false);
     RELEASE_ASSERT(!exceptionState.hadException());
     *result = cppValue;
     return true;
 }
 
 bool V8TestObject::PrivateScript::enumForPrivateScriptAttributeSetter(LocalFrame* frame, TestObject* holderImpl, String cppValue)
 {
     if (!frame)
         return false;
     v8::HandleScope handleScope(toIsolate(frame));
     ScriptForbiddenScope::AllowUserAgentScript script;
     v8::Local<v8::Context> contextInPrivateScript = toV8Context(frame, DOMWrapperWorld::privateScriptIsolatedWorld());
     if (contextInPrivateScript.IsEmpty())
         return false;
     ScriptState* scriptState = ScriptState::from(contextInPrivateScript);
     ScriptState* scriptStateInUserScript = ScriptState::forMainWorld(frame);
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Local<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     ExceptionState exceptionState(ExceptionState::SetterContext, "enumForPrivateScript", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     return PrivateScriptRunner::runDOMAttributeSetter(scriptState, scriptStateInUserScript, "TestObject", "enumForPrivateScript", holder, v8String(scriptState->isolate(), cppValue));
 }
 
 } // namespace blink