RFR: 8166276: Refactor gen_process_roots to allow simpler fix for 8165949

[Jesper Wilhelmsson]

Stefan,

I'm not sure if I'm allowed to review this, but if I am, looks good!  :)
At least one of us should be allowed to be counted as a reviewer I think.

Thanks,
/Jesper


Den 20/9/16 kl. 11:08, skrev Stefan Johansson:
> Hi all,
>
> While working on JDK-8165949 [0] I realized that gen_process_roots needed to be
> cleaned/split up to allow it to be fixed. This work had in big parts already
> been done as part of an enhancement [1] that never got pushed. That enhancement
> included another cleanup as well but I have split it out to only include the
> necessary part in this fix. It splits gen_process_roots into two different
> versions, one used for young collections and one for old. This make the two
> methods much easier to follow and removes some special cases. I will post a
> second review for the actual bug-fix.
>
> Webrev:
> http://cr.openjdk.java.net/~sjohanss/8166276/hotspot.00/
>
> Subtask:
> https://bugs.openjdk.java.net/browse/JDK-8166276
>
> Testing:
> * JTREG tests locally
> * RBT on HS-gc tier 2-4
>
> Thanks,
> Stefan
>
> [0] https://bugs.openjdk.java.net/browse/JDK-8165949
> [1] https://bugs.openjdk.java.net/browse/JDK-8072809