RFR: 8366178: Implement JEP 526: Lazy Constants (Second Preview) [v25]

[ExE Boss]

On Wed, 12 Nov 2025 16:33:40 GMT, Jorn Vernee <jvernee 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 112 commits:
>> 
>>  - Clarify toString spec
>>  - Merge branch 'master' into lazy-constants
>>  - Add @AOTSafeClassInitializer
>>  - Address comments in PR
>>  - Fix merge mistake
>>  - Merge master
>>  - Rework toString implementations
>>  - Update after doc comments
>>  - Merge branch 'master' into lazy-constants
>>  - Revert the AbstractMap.keySet @Stable annotation
>>  - ... and 102 more: https://git.openjdk.org/jdk/compare/76a1109d...1f439bec
>
> src/java.base/share/classes/java/util/LazyCollections.java line 578:
> 
>> 576:             if (t == null) {
>> 577:                 final T newValue = switch (functionHolder.function()) {
>> 578:                     case Supplier<?> sup     -> (T) sup.get();
> 
> Is the held function ever a Supplier? I don't see a FunctionHolder being created with one.

This is from when `FunctionHolder` was located in the `jdk.internal.lang.stable` package in [GH‑25878], and was used to implement the computing function freeing mechanism in [`StableValue​::supplier(…)`].

[GH‑25878]: https://github.com/openjdk/jdk/pull/25878
[`StableValue​::supplier(…)`]: https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/StableValue.html#supplier(java.util.function.Supplier)

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PR Review Comment: https://git.openjdk.org/jdk/pull/27605#discussion_r2519902578