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

[Frederic Parain]

On Wed, 3 Sep 2025 16:58:44 GMT, Coleen Phillimore <coleenp 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 122:
> 
>> 120:     bk = ObjArrayKlass::cast(element_klass)->bottom_klass();
>> 121:   } else if (element_klass->is_flatArray_klass()) {
>> 122:     bk = FlatArrayKlass::cast(element_klass)->element_klass();  // flat array case should be merge with refArray case once reparented
> 
> TODO?  Not sure what this means.  FlatArrayKlass inherits from ObjArrayKlass in your patch, so this is done?

Fixed.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1452#discussion_r2324894787