IDL compiler: [Default] arguments

Source/bindings/scripts/code_generator_v8.pm

 # Copyright (C) 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
 # Copyright (C) 2006 Anders Carlsson <andersca@mac.com>
 # Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
 # Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
 # Copyright (C) 2006 Apple Computer, Inc.
 # Copyright (C) 2007, 2008, 2009, 2012 Google Inc.
 # Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
 # Copyright (C) Research In Motion Limited 2010. All rights reserved.
 # Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 # Copyright (C) 2012 Ericsson AB. All rights reserved.
@@ skipping 2436 matching lines @@
 
     my $parameterCheckString = "";
     my $paramIndex = 0;
     my %replacements = ();
 
     foreach my $parameter (@{$function->parameters}) {
         my $humanFriendlyIndex = $paramIndex + 1;
         my $nativeType = GetNativeType($parameter->type, $parameter->extendedAttributes, "parameter");
 
         # Optional arguments without [Default=...] should generate an early call with fewer arguments.
-        # Optional arguments with [Optional=...] should not generate the early call.
         # Optional Dictionary arguments always considered to have default of empty dictionary.
         if ($parameter->isOptional && !$parameter->extendedAttributes->{"Default"} && $nativeType ne "Dictionary" && !IsCallbackInterface($parameter->type)) {
             $parameterCheckString .= <<END;
     if (UNLIKELY(args.Length() <= $paramIndex)) {
 END
             $parameterCheckString .= GenerateFunctionCallString($function, $paramIndex, "    " x 2, $interface, $forMainWorldSuffix, %replacements);
             $parameterCheckString .= <<END;
         return;
     }
 END
@@ skipping 3806 matching lines @@
 
     return 1 if $interface->extendedAttributes->{"CustomToV8"};
     return 1 if $interface->extendedAttributes->{"SpecialWrapFor"};
     return 1 if InheritsInterface($interface, "Document");
     return 1 if SVGTypeNeedsToHoldContextElement($interface->name);
 
     return 0;
 }
 
 1;