RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v6]

[Chen Liang]

On Sun, 16 Mar 2025 16:50:19 GMT, Luca Kellermann <duke at openjdk.org> wrote:

>> Per Minborg has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 246 commits:
>> 
>>  - Merge branch 'master' into implement-jep502
>>  - Clean up exception messages and fix comments
>>  - Rename field
>>  - Rename method and fix comment
>>  - Rework reenterant logic
>>  - Use acquire semantics for reading rather than volatile semantics
>>  - Add missing null check
>>  - Simplify handling of sentinel, wrap, and unwrap
>>  - Fix JavaDoc issues
>>  - Fix members in StableEnumFunction
>>  - ... and 236 more: https://git.openjdk.org/jdk/compare/4e51a8c9...d6e1573f
>
> src/java.base/share/classes/java/util/ImmutableCollections.java line 798:
> 
>> 796:                 throw new IndexOutOfBoundsException(i);
>> 797:             }
>> 798:         }
> 
> I think `orElseSet` should be outside of the `try` block, otherwise an `ArrayIndexOutOfBoundsException` thrown by `mapper.apply` will be wrapped.

Even better, we should just do a `Preconditions.checkIndex` explicitly.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23972#discussion_r1997792857