[webkit-dev] RuntimeEnabledFeatures for JSC (was RE: Getting at Settings object from WorkerContext)

Jeremy Orlow jorlow at chromium.org
Thu Jan 6 13:04:55 PST 2011

On Thu, Jan 6, 2011 at 8:57 PM, Adam Barth <abarth at webkit.org> wrote:

> On Thu, Jan 6, 2011 at 12:47 PM, Darin Adler <darin at apple.com> wrote:
> > On Jan 6, 2011, at 12:41 PM, Joe Mason wrote:
> >> I took a look at CodeGeneratorJS.pm to see how hard it would be to port
> this over. I have no idea where to start…  The structure of
> CodeGeneratorJS.pm and CodeGeneratorV8.pm seem quite different. This also
> seems like a lot of work to do just to enable/disable one feature, but I
> guess if there’s no framework for enabling/disabling JS features in JSC at
> all then it’s necessary.
> >
> > I’m sad that the V8 code generator script diverged so much from the
> original. It would be great if they were kept closer. I have refactored them
> to become more similar and even share code whenever I had to modify both,
> such as when making changes to [Reflect].
> That's one my list of things I'd like to do, but my Perl isn't strong
> enough yet.  :(

FWIW: Whenever this has come up in the past, I believe the consensus has
been that a re-write in Python would be acceptable.

>  >> Is there wide agreement that porting the RuntimeEnabledFeatures to JSC
> is a good idea?
> >
> > I think it would probably be good. Not sure why the person who did it
> originally did it V8-only.
> There's been some discussion about it in the past on webkit-dev.  I
> think the issue revolves around the way JavaScriptCore uses static
> tables to store properties.  It's important that runtime disabled
> properties are completely disabled (e.g., "webkitIndexedDB" in window
> returns false).  If you're able to get it to work, that's great!
> Adam
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