RFR: 8248132: ZGC: Unify handling of all OopStorage instances in root processing

[Stefan Karlsson]

Thanks, Thomas.

StefanK

On 2020-06-24 12:05, Thomas Schatzl wrote:
> Hi,
>
> On 24.06.20 11:54, Stefan Karlsson wrote:
>> Hi Per,
>>
>> Good point about the strong_count being statically known. I wasn't 
>> entirely happy about the type fiddling in the proposed change below, 
>> so I experimented with alternative implementations. The proposal I 
>> current have is this:
>> https://cr.openjdk.java.net/~stefank/8248132/webrev.07/
>>
>> The patch adds a few utility classes:
>> - ValueObjBlock stamps out a number of instances:
>> - ValueObjArray provides an array over those instances
>>
>> With this we can now stamp out the OopStorage::ParState instances 
>> into OopStorageSetParState without dynamic allocation and without 
>> type casting.
>>
>> A version without the gtest and with the out-of-bounds check was 
>> tested in tier1-3.
>>
>
>   looks good.
>
> Thomas
>