On Thu, Nov 1, 2012 at 10:51 AM, Alexey Proskuryakov <a...@apple.com> wrote: > 01.11.2012, в 10:36, Adam Barth <aba...@webkit.org> написал(а): >> Today, we use ScriptWrappable for Nodes only, but we would benefit by >> making more use of ScriptWrappable, particularly for DOM objects that >> almost always have JavaScript wrappers. For example, XMLHttpRequest >> objects exist only when created by script, which means that every >> XMLHttpRequest object has a JavaScript wrapper. > > This looks like a great idea for investigation to me. > > Do you have a rough estimate of how large of a win we are talking about?
I don't have numbers currently, but I'm happy to gather some. My recollection is that the win for nodes was substantial on DOM benchmarks. I would expect the win to be fairly large for DOM objects like NodeList where script is likely to access properties like length and item frequently (e.g., in a loop). > For example, XMLHttpRequests are probably not numerous enough to matter. > Also, this would not be an improvement for XMLHttpRequest objects created in > secondary worlds. Yeah. This is a main-world optimization only. Even for Nodes, we use a HashMap for secondary worlds. Adam > I expect there to be cases where the win is more clear though. > > - WBR, Alexey Proskuryakov > _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo/webkit-dev
