RFR: 8204538: Split ScanClosure and ScanClosureWithParBarrier

[Thomas Schatzl]

Hi,

On Thu, 2018-06-07 at 12:16 +0200, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this patch to change ScanClosureWithParBarrier to not 
> inherit from ScanClosure.
> 
> http://cr.openjdk.java.net/~stefank/8204538/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8204538
> 
> ScanClosureWithParBarrier is the only ExtendedOopClosure sub class
> that  overrides the do_oop functions of a super class. This patch
> cleans this up to pave the way for:
> 
>   https://bugs.openjdk.java.net/browse/JDK-8204540 - Automatic oop 
> closure devirtualization

  looks good.

Is there a way to automatically determine such issues?

Thanks,
  Thomas