Since RegExpPrivates are lazy and purged on every GC, I removed the eager propagation of the RegExpPrivate from the script's RegExpObject in methodjitted jsop_regexp in bug 673188. What we probably want now is to: - Eagerly initialize the |RegExpPrivate| for the script's RegExpObject at methodjit compile time - Test whether the RegExpPrivate slot is null - If so, exit to stub, which will create it on the script's RegExpObject (for reuse later) and then clone it as normal - Otherwise, incref as we were doing before Should be a tiny patch, but I didn't want to try to fix it for the former commit so that we'd have a patch per bug.
Created attachment 567120 [details] [diff] [review] Force private creation for clone source. We need the JSOP_REGEXP op to create sharing of the RegExpPrivate. If the script's RegExpObject has a NULL RegExpPrivate no such sharing will occur.
Also, like I was indicating in the bug description, with the purging added in bug 634654 we'll want to branch to the stub if the original has a null RegExpPrivate so that we can recreate and subsequently share it.
Created attachment 567133 [details] [diff] [review] Force private creation for clone source. Forgotten refcount bump for mjit code.