[bindings] Split toUInt64 into fast inline vs slow non-inline code paths.

Source/bindings/core/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
@@ skipping 459 matching lines @@
 // http://www.w3.org/TR/WebIDL/#es-long-long
 CORE_EXPORT int64_t toInt64(v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
 inline int64_t toInt64(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
     return toInt64(value, NormalConversion, exceptionState);
 }
 
 // Convert a value to a 64-bit integer assuming the conversion cannot fail.
 int64_t toInt64(v8::Handle<v8::Value>);
 
+CORE_EXPORT uint64_t toUInt64Slow(v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
+
 // Convert a value to a 64-bit unsigned integer. The conversion fails if the
 // value cannot be converted to a number or the range violated per WebIDL:
 // http://www.w3.org/TR/WebIDL/#es-unsigned-long-long
-CORE_EXPORT uint64_t toUInt64(v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
+inline uint64_t toUInt64(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
+{
+    // Fast case. The value is a 32-bit unsigned integer.
+    if (value->IsUint32())
+        return value->Uint32Value();
+
+    if (value->IsInt32() && configuration == NormalConversion)
+        return value->Int32Value();
+
+    return toUInt64Slow(value, configuration, exceptionState);
+}
+
 inline uint64_t toUInt64(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
     return toUInt64(value, NormalConversion, exceptionState);
 }
 
 // Convert a value to a 64-bit unsigned integer assuming the conversion cannot fail.
 uint64_t toUInt64(v8::Handle<v8::Value>);
 
 // Convert a value to a double precision float, which might fail.
 CORE_EXPORT double toDoubleSlow(v8::Handle<v8::Value>, ExceptionState&);
@@ skipping 540 matching lines @@
 
 // Callback functions used by generated code.
 void v8ConstructorAttributeGetterAsProperty(v8::Local<v8::String> propertyName, const v8::PropertyCallbackInfo<v8::Value>&);
 void v8ConstructorAttributeGetterAsAccessor(const v8::FunctionCallbackInfo<v8::Value>&);
 
 typedef void (*InstallTemplateFunction)(v8::Local<v8::FunctionTemplate>, v8::Isolate*);
 
 } // namespace blink
 
 #endif // V8Binding_h