RFR: 8368050: Validation missing in ClassFile signature factories [v3]

[Adam Sotona]

On Fri, 19 Sep 2025 00:27:04 GMT, Chen Liang <liach at openjdk.org> wrote:

>> The Signature modeling in the ClassFile API is missing some validations required by JVMS, notably identifier character restrictions and void type restrictions. In addition, the model currently uses `ClassDesc` to indicate a simple name for an inner class signature, which is incorrect, and this patch proposes to deprecate that API for removal.
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix links

src/java.base/share/classes/jdk/internal/classfile/impl/ClassRemapperImpl.java line 312:

> 310:                 Signature.ClassTypeSig.of(
> 311:                         cts.outerType().map(this::mapSignature).orElse(null),
> 312:                         Util.toInternalName(map(cts.classDesc())), // wrong, needs fix with InnerClasses

Signatures of inner classes should be disambiguated to avoid this kind of confusions.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27380#discussion_r2362022365