Better arity checks for overloads

Source/bindings/v8/custom/V8SubtleCryptoCustom.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.
 
 #include "config.h"
 #include "V8SubtleCrypto.h"
 
 #include "V8Key.h"
 #include "bindings/v8/Dictionary.h"
 #include "bindings/v8/custom/V8ArrayBufferCustom.h"
@@ skipping 62 matching lines @@
     }
     TONATIVE_VOID(Key*, key, V8Key::toNativeWithTypeCheck(info.GetIsolate(), info[1]));
     TONATIVE_VOID(ArrayBufferView*, signature, info[2]->IsArrayBufferView() ? V8ArrayBufferView::toNative(v8::Handle<v8::ArrayBufferView>::Cast(info[2])) : 0);
     TONATIVE_VOID(ArrayBufferView*, data, info[3]->IsArrayBufferView() ? V8ArrayBufferView::toNative(v8::Handle<v8::ArrayBufferView>::Cast(info[3])) : 0);
     v8SetReturnValue(info, impl->verifySignature(algorithm, key, signature, data).v8Value());
 }
 
 void V8SubtleCrypto::verifyMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     v8::Isolate* isolate = info.GetIsolate();
+    ExceptionState exceptionState(ExceptionState::ExecutionContext, "verify", "SubtleCrypto", info.Holder(), isolate);
     // typedef (ArrayBuffer or ArrayBufferView) CryptoOperationData;
     //
     // Promise verify(Dictionary algorithm, Key key,
     //                CryptoOperationData signature,
     //                CryptoOperationData data);
     switch (info.Length()) {
     case 4:
         // Promise verify(Dictionary algorithm, Key key, ArrayBuffer signature, ArrayBuffer data);
         if (V8ArrayBuffer::hasInstance(info[2], isolate)
             && V8ArrayBuffer::hasInstance(info[3], isolate)) {
@@ skipping 12 matching lines @@
             verify3Method(info);
             return;
         }
         // Promise verify(Dictionary algorithm, Key key, ArrayBufferView signature, ArrayBufferView data);
         if (V8ArrayBufferView::hasInstance(info[2], isolate)
             && V8ArrayBufferView::hasInstance(info[3], isolate)) {
             verify4Method(info);
             return;
         }
         break;
-    }
-    ExceptionState exceptionState(ExceptionState::ExecutionContext, "verify", "SubtleCrypto", info.Holder(), isolate);
-    if (UNLIKELY(info.Length() < 4)) {
-        throwArityTypeError(exceptionState, 4, info.Length());
+    default:
+        throwArityTypeError(exceptionState, "[4]", info.Length());
         return;
+        break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();
 }
 
 } // namespace WebCore