RFR: 8374523: [BACKOUT] Move input validation checks to Java for java.lang.StringCoding intrinsics

[Volkan Yazici]

On Tue, 6 Jan 2026 09:06:27 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Back out `java.lang.StringCoding` changes delivered in [JDK-8361842] (#25998 & 655dc516c22), which causes regressions reported in [JDK-8374210].
>> 
>> [JDK-8361842]: https://bugs.openjdk.org/browse/JDK-8361842
>> [JDK-8374210]: https://bugs.openjdk.org/browse/JDK-8374210
>
> src/java.base/share/classes/jdk/internal/access/JavaLangAccess.java line 455:
> 
>> 453:      * compatible.
>> 454:      * <p>
>> 455:      * <b>WARNING: This method does not perform any bound checks.</b>
> 
> These two lines are not in the original commit?
> 
> https://github.com/openjdk/jdk/commit/655dc516c22ac84fccee6b1fdc607c492465be6b#diff-bd92d760986b9249dd3c02cc147db4f7e9dbbef90afef4971ee497a50e48c740

In chronological order:

1. 8fcfddb2d202 renamed `encodeASCII` to `uncheckedEncodeASCII` and added the `WARNING` clause.
2. 655dc516c22a, the commit this PR is reverting, renamed the method back to `encodeASCII` and removed the `WARNING`. This was possible, since `StringCoding::implEncodeAsciiArray` was hardened with necessary checks in the very same commit.

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PR Review Comment: https://git.openjdk.org/jdk/pull/29055#discussion_r2664348820