[lworld] RFR: 8366705: [lworld] Re-work of arrays meta-data [v4]

[Frederic Parain]

On Thu, 4 Sep 2025 06:54:46 GMT, David Simms <dsimms at openjdk.org> wrote:

>> Frederic Parain has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 67 commits:
>> 
>>  - Merge branch 'array_klasses' of github.com:fparain/valhalla into array_klasses
>>  - Forgot a TODO
>>  - Small cleanup
>>  - Merge remote-tracking branch 'upstream/lworld' into array_klasses
>>  - Moved get_Klass() back to protected and updated usages
>>  - Merge branch 'array_klasses' of github.com:fparain/valhalla into array_klasses
>>  - Linked TODOs to JDK-8366668
>>  - Multidim array fix
>>  - Cleanup T_FLAT_ELEMENT related code
>>  - Fix for isAssignableFrom + tests
>>  - ... and 57 more: https://git.openjdk.org/valhalla/compare/22e9d5f5...527a17b6
>
> src/hotspot/share/oops/objArrayKlass.cpp line 159:
> 
>> 157: ArrayDescription ObjArrayKlass::array_layout_selection(Klass* element, ArrayProperties properties) {
>> 158:   // TODO FIXME: the layout selection should take the array size in consideration
>> 159:   // to avoid creation of arrays too big to be handled by the VM
> 
> There is a related bug (though it is old): [8233189](https://bugs.openjdk.org/browse/JDK-8233189), perhaps we need a new bug noted here (and relate the old one)

Comment and CR have been updated.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1452#discussion_r2322930580