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

Source/bindings/tests/results/V8TestInterfaceConstructor.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 "V8TestInterfaceConstructor.h"
 
 #include "RuntimeEnabledFeatures.h"
@@ skipping 47 matching lines @@
 
     v8::Handle<v8::Object> wrapper = info.Holder();
     V8DOMWrapper::associateObjectWithWrapper<V8TestInterfaceConstructor>(impl.release(), &V8TestInterfaceConstructor::wrapperTypeInfo, wrapper, isolate, WrapperConfiguration::Independent);
     v8SetReturnValue(info, wrapper);
 }
 
 static void constructor2(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     v8::Isolate* isolate = info.GetIsolate();
     ExceptionState exceptionState(ExceptionState::ConstructionContext, "TestInterfaceConstructor", info.Holder(), isolate);
-    TONATIVE_VOID(double, doubleArg, static_cast<double>(info[0]->NumberValue()));
-    TOSTRING_VOID(V8StringResource<>, stringArg, info[1]);
-    TONATIVE_VOID(TestInterfaceEmpty*, testInterfaceEmptyArg, V8TestInterfaceEmpty::toNativeWithTypeCheck(info.GetIsolate(), info[2]));
-    TONATIVE_VOID(Dictionary, dictionaryArg, Dictionary(info[3], info.GetIsolate()));
-    if (!dictionaryArg.isUndefinedOrNull() && !dictionaryArg.isObject()) {
-        exceptionState.throwTypeError("parameter 4 ('dictionaryArg') is not an object.");
-        exceptionState.throwIfNeeded();
-        return;
+    double doubleArg;
+    V8StringResource<> stringArg;
+    TestInterfaceEmpty* testInterfaceEmptyArg;
+    Dictionary dictionaryArg;
+    Vector<String> sequenceStringArg;
+    Vector<Dictionary> sequenceDictionaryArg;
+    Dictionary optionalDictionaryArg;
+    TestInterfaceEmpty* optionalTestInterfaceEmptyArg;
+    {
+        v8::TryCatch block;
+        TONATIVE_VOID_NO_DECL(doubleArg, static_cast<double>(info[0]->NumberValue()));
+        TOSTRING_VOID_NO_DECL(stringArg, info[1]);
+        TONATIVE_VOID_NO_DECL(testInterfaceEmptyArg, V8TestInterfaceEmpty::toNativeWithTypeCheck(info.GetIsolate(), info[2]));
+        TONATIVE_VOID_NO_DECL(dictionaryArg, Dictionary(info[3], info.GetIsolate()));
+        if (!dictionaryArg.isUndefinedOrNull() && !dictionaryArg.isObject()) {
+            exceptionState.throwTypeError("parameter 4 ('dictionaryArg') is not an object.");
+            exceptionState.throwIfNeeded();
+            return;
+        }
+        TONATIVE_VOID_NO_DECL(sequenceStringArg, toNativeArray<String>(info[4], 5, info.GetIsolate()));
+        TONATIVE_VOID_NO_DECL(sequenceDictionaryArg, toNativeArray<Dictionary>(info[5], 6, info.GetIsolate()));
+        TONATIVE_VOID_NO_DECL(optionalDictionaryArg, Dictionary(info[6], info.GetIsolate()));
+        if (!optionalDictionaryArg.isUndefinedOrNull() && !optionalDictionaryArg.isObject()) {
+            exceptionState.throwTypeError("parameter 7 ('optionalDictionaryArg') is not an object.");
+            exceptionState.throwIfNeeded();
+            return;
+        }
+        TONATIVE_VOID_NO_DECL(optionalTestInterfaceEmptyArg, V8TestInterfaceEmpty::toNativeWithTypeCheck(info.GetIsolate(), info[7]));
     }
-    TONATIVE_VOID(Vector<String>, sequenceStringArg, toNativeArray<String>(info[4], 5, info.GetIsolate()));
-    TONATIVE_VOID(Vector<Dictionary>, sequenceDictionaryArg, toNativeArray<Dictionary>(info[5], 6, info.GetIsolate()));
-    TONATIVE_VOID(Dictionary, optionalDictionaryArg, Dictionary(info[6], info.GetIsolate()));
-    if (!optionalDictionaryArg.isUndefinedOrNull() && !optionalDictionaryArg.isObject()) {
-        exceptionState.throwTypeError("parameter 7 ('optionalDictionaryArg') is not an object.");
-        exceptionState.throwIfNeeded();
-        return;
-    }
-    TONATIVE_VOID(TestInterfaceEmpty*, optionalTestInterfaceEmptyArg, V8TestInterfaceEmpty::toNativeWithTypeCheck(info.GetIsolate(), info[7]));
     ExecutionContext* context = currentExecutionContext(isolate);
     Document& document = *toDocument(currentExecutionContext(isolate));
     RefPtr<TestInterfaceConstructor> impl = TestInterfaceConstructor::create(context, document, doubleArg, stringArg, testInterfaceEmptyArg, dictionaryArg, sequenceStringArg, sequenceDictionaryArg, optionalDictionaryArg, optionalTestInterfaceEmptyArg, exceptionState);
     if (exceptionState.throwIfNeeded())
         return;
 
     v8::Handle<v8::Object> wrapper = info.Holder();
     V8DOMWrapper::associateObjectWithWrapper<V8TestInterfaceConstructor>(impl.release(), &V8TestInterfaceConstructor::wrapperTypeInfo, wrapper, isolate, WrapperConfiguration::Independent);
     v8SetReturnValue(info, wrapper);
 }
@@ skipping 103 matching lines @@
     fromInternalPointer(object)->deref();
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline(TestInterfaceConstructor* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 } // namespace WebCore