RFR: 8338544: Dedicated Array class descriptor implementation [v7]

[Chen Liang]

On Wed, 23 Oct 2024 04:20:49 GMT, Chen Liang <liach at openjdk.org> wrote:

>> @cl4es discovered that Stack Map generation in ClassFile API uses `componentType` and `arrayType` for `aaload` `aastore` instructions, which are currently quite slow. We can split out array class descriptors from class or interfaces to support faster `arrayType` and `componentType` operations.
>> 
>> Tentative, as I currently have no way to measure the actual impact of this patch on the startup performance; however, this made the `ClassDesc` implementations much cleaner.
>
> Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 19 commits:
> 
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/array-cd
>  - Restore the impl spec to the API spec
>  - Relax displayName spec
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/array-cd
>  - Merge
>  - object array desc constant
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/array-cd
>  - Mandy reviews
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/array-cd
>  - mlchung suggestions: elementType, improve utility methods
>  - ... and 9 more: https://git.openjdk.org/jdk/compare/d6eddcda...bf9ff94c

Just noticed that the `ArrayClassDesc::displayName` was buggy - existing tests had no coverage and I have added test coverage for `displayName` and a few other missed methods.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/20665#issuecomment-2430998033