On Mon, Aug 13, 2012, at 02:47 PM, Mike Abdullah wrote: > An idea I've vaguely wondered about would be turning the isa variable > into a tagged pointer. If you know nothing is accessing it directly (to > do so was deprecated with the modern runtime), then, say, the last 4 bits > of the pointer could be used to record the retain count. Once they're > used up (for those rare, highly retained objects), you spill over to > runtime's existing system. Any calls to the runtime to determine an > object's class would of course be aware of this and ignore those bits.
Unfortunately a lot of code out there accesses isa directly. We used to be a pretty big offender. --Kyle Sluder _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
