RFR 8151706: Update VarHandle implementation to use @Stable arrays

Michael Haupt michael.haupt at oracle.com
Fri Apr 8 14:11:51 UTC 2016

Hi Paul,

note this is a lower-case review. Having looked at 8151705, thumbs up for this one as well - they go hand in hand and looking at one of them only doesn't feel right. :-)



> Am 08.04.2016 um 11:56 schrieb Paul Sandoz <paul.sandoz at oracle.com>:
> Hi,
> Please review:
>  http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8151706-VH-form-table-stable/webrev/ <http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8151706-VH-form-table-stable/webrev/>
> Now that @Stable arrays are supported by C1 (thanks Vladimir!) we can switch from the explicit use of MemberName fields in VarForm to a @Stable MemberName[] array.
> I also took the opportunity to simplify the linking from a VarHandle impl to MemberName[] array, now that the implementation has settled down. This will reduce initialization costs and memory churn.
> I held off making further improvements for now. For example, VarForm can probably go away (also removing the dependency on ClassValue). A VarHandle instance can directly hold a MemberName[] array whose source reference is statically held on the associated VarHandle implementation. It should also be possible to lazily create MemberName instances as required, rather than aggressively doing so, which may further reduce initialization costs and memory usage in common cases.
> Paul.


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