RFR: 8333377: Migrate Generic Signature parsing to ClassFile API

[Chen Liang]

On Fri, 17 May 2024 12:01:23 GMT, Chen Liang <liach at openjdk.org> wrote:

> Core reflection's generic signature parsing uses an ancient library with outdated visitor pattern on a tree model and contains unnecessary boilerplates. This is a duplication of ClassFile API's signature model. We should just move to ClassFile API, which is more throughoutly tested as well.
> 
> To ensure compatibility, new tests are added to ensure consistent behavior when encountering malformed signatures or signatures with missing types. The reflective objects have been preserved and the only change is that lazy expansion now happens from CF objects, to reduce compatibility risks.

Indeed, I put the JBS issue to target release 24. I believe given the potential behavioral changes, rushing into release 23 is a risky choice. (the 4 new tests can target 23 in a separate patch, but they require removal of a few redundant assertions in old generic code)

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PR Comment: https://git.openjdk.org/jdk/pull/19281#issuecomment-2143205523