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

Adam Barth abarth at webkit.org
Thu Jan 6 13:28:03 PST 2011

On Thu, Jan 6, 2011 at 1:04 PM, Jeremy Orlow <jorlow at chromium.org> wrote:
> 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.

Yep, which is why I got excited about the idea of testing the binding
generator scripts directly.  Hopefully those tests will make
refactoring / improving the scripts easier.


>> >> 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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