RFR: 8339939: [JVMCI] Don't compress abstract and interface Klasses

[Yudi Zheng]

On Tue, 17 Sep 2024 10:42:12 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotConstant.java line 29:
>> 
>>> 27: /**
>>> 28:  * Marker interface for hotspot specific constants.
>>> 29:  */
>> 
>> Let's take this opportunity to improve this javadoc:
>> 
>> /**
>>  * A value in a space managed by Hotspot (e.g. heap or metaspace).
>>  * Some of these values can be referenced with a compressed pointer (32 bits)
>>  * instead of a full word-sized pointer.
>>  */
>
> drive-by comment, 32-bit is an implementation detail. The width of a narrowKlass will be adjustable with the upcoming JEP450. Referring to 32 bit may be obsolete soon.

Thanks for the note! By adjustable you mean it can go beyond 32 bits?

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PR Review Comment: https://git.openjdk.org/jdk/pull/20949#discussion_r1764760056