RFR: Verify global and local gc-state status

[Aleksey Shipilev]

On 07/05/2018 08:08 PM, Roman Kennke wrote:
> Am 05.07.2018 um 20:04 schrieb Aleksey Shipilev:
>> http://cr.openjdk.java.net/~shade/shenandoah/verify-gc-state/webrev.01/
>>
>> I wanted to do this for a long time, and now the work in mark-compact requires the verification step
>> like this. It checks that gc-states in both thread-local caches and global in ShenandoahHeap are the
>> ones we expect.
>>
>> Testing: tier3_gc_shenandoah
>>
> 
> Makes sense.
> 
> What have those changes to do with that?
> 
> http://cr.openjdk.java.net/~shade/shenandoah/verify-gc-state/webrev.01/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp.udiff.html

Verifier checks that no "in-progress" bits are set. The code movements make that happen.

-Aleksey