Var JavascriptReflect::EntryPreventExtensions(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Reflect.preventExtensions"));
AssertMsg(args.Info.Count > 0, "Should always have implicit 'this'");
if (args.Info.Flags & CallFlags_New)
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_ErrorOnNew, _u("Reflect.preventExtensions"));
}
if (args.Info.Count < 2 || !JavascriptOperators::IsObject(args[1]))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_FunctionArgument_NeedObject, _u("Reflect.preventExtensions"));
}
Var target = args[1];
RecyclableObject* targetObj = RecyclableObject::FromVar(target);
GlobalObject* globalObject = targetObj->GetLibrary()->GetGlobalObject();
if (globalObject != targetObj && globalObject && (globalObject->ToThis() == targetObj))
{
globalObject->PreventExtensions();
}
return scriptContext->GetLibrary()->GetTrueOrFalse(targetObj->PreventExtensions());
}
