8333377: Migrate Generic Signature parsing to ClassFile API

[liach]

Core reflection's generic signature parsing uses an ancient library with outdated visitor pattern on a tree model and contains unnecessary boilerplates.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.

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Progress

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Issue

• JDK-8333377: Migrate Generic Signature parsing to ClassFile API (Enhancement - P4)

Reviewing

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⚠️ @liach This pull request contains merges that bring in commits not present in the target repository. Since this is not a "merge style" pull request, these changes will be squashed when this pull request in integrated. If this is your intention, then please ignore this message. If you want to preserve the commit structure, you must change the title of this pull request to Merge <project>:<branch> where <project> is the name of another project in the OpenJDK organization (for example Merge jdk:master).

[mlbridge]

Webrevs

• 05: Full (ab0b4511)
• 04: Full - Incremental (5745bfd0)
• 03: Full (dea7a235)
• 02: Full (86b89e5b)
• 01: Full (19ee8797)
• 00: Full (4110c13f)

[jddarcy]

I think I'll need to be one of the reviews on this, but don't anticipate being able to review it before JDK 23 rampdown. Therefore, I think this would be appropriate to be targeted to JDK 24.

[liach]

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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[liach]

Keep-alive.

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[liach]

/open

This is becoming more necessary as valhalla brings changes to signature format.

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@liach This pull request is now open

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[openjdk]

@liach this pull request can not be integrated into master due to one or more merge conflicts. To resolve these merge conflicts and update this pull request you can run the following commands in the local repository for your personal fork:

git checkout feature/new-generic-info
git fetch https://git.openjdk.org/jdk.git master
git merge FETCH_HEAD
# resolve conflicts and follow the instructions given by git merge
git commit -m "Merge master"
git push

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@liach This pull request has been inactive for more than 8 weeks and will now be automatically closed. If you would like to continue working on this pull request in the future, feel free to reopen it! This can be done using the /open pull request command.

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@liach Please do not rebase or force-push to an active PR as it invalidates existing review comments. Note for future reference, the bots always squash all changes into a single commit automatically as part of the integration. See OpenJDK Developers’ Guide for more information.

[liach]

Sorry for the force push - Too many commits meaning fixing merge conflicts in every single one of them was a bit complicated.

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[liach]

Keep alive. One day there will be a reviewer...

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[liach]

After a revisit to this PR, I think I might split the work of improving BytecodeDescriptor error message and tests covering failure-case behaviors into a prerequisite PR to this one, to ensure this PR preserves the failure behavior present on mainline.

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[liach]

/open

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@liach This pull request is now open

[ExE-Boss]

Given that this basically rewrites most of sun.reflect.generics.*, I feel like it might be better to just move these new files to jdk.internal.reflect.generics.*.

[liach]

We should, in fact, remove as much legacy sun packages as possible - for the particular package name choice, I think jdk.internal.reflect.type might be better, as we are really reflecting on language types. But I think that effort will get its own ticket.

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[liach]

/open

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@liach This pull request is now open

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[ExE-Boss]

Refs:

• 8368331: ClassFile Signature parsing fails for type parameter with no supertype #27439 (JDK‑8368331)