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

[Doug Simon]

On Wed, 11 Sep 2024 13:09:07 GMT, Yudi Zheng <yzheng at openjdk.org> wrote:

> https://github.com/openjdk/jdk/pull/19157 disallows storing abstract and interface Klasses in class metaspace. JVMCI has to respect this and avoids compressing abstract and interface Klasses

Marked as reviewed by dnsimon (Reviewer).

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.
 */

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PR Review: https://git.openjdk.org/jdk/pull/20949#pullrequestreview-2297174735
PR Review Comment: https://git.openjdk.org/jdk/pull/20949#discussion_r1754641618