On Thu, 9 May 2024 13:51:09 GMT, Coleen Phillimore <cole...@openjdk.org> wrote:

> This change stores InstanceKlass for interface and abstract classes in the 
> non-class metaspace, since class metaspace will have limits on number of 
> classes that can be represented when Lilliput changes go in.  Classes that 
> have no instances created for them don't require compressed class pointers.  
> The generated LambdaForm classes are also AllStatic, and changing them to 
> abstract moves them to non-class metaspace too.  It's not technically great 
> to make them abstract and not final but you can't have both.  Java classfile 
> access flags have no way of specifying something like AllStatic.
> 
> Tested with tier1-8.

If I understand correctly, we already have limits on how many classes we can 
represent as compressed class-pointers. While this is nice for Lilliput, this 
is equally useful for non-Lilliput CCP, because addressable class-space doesn't 
get polluted by classes that never need to be encoded as CCP, and thus 
effectively increases the number of classes that we can address without 
resorting to -UseCompressedClassPointers.

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PR Comment: https://git.openjdk.org/jdk/pull/19157#issuecomment-2304017272

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