Integrated: 8353917: jnativescan: Simplify ClassResolver

[Jorn Vernee]

On Mon, 7 Apr 2025 16:36:07 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> `jnativescan` uses the `ClassResolver` class to find both system classes, as well as application classes. In principle, a class resolver supports both iterating over all classes from that particular source, as well as looking up classes by name. However, the `ClassResolver` for system classes doesn't support iterating, and the lookup functionality for `ClassResolvers` from other sources is never used (only iterating).
> 
> This patch proposes to split the iterating functionality out of `ClassResolver`. Clients that were using this functionality will switch to using the iteration functionality that is available on `ClassFileSource` directly (whose classes were previously being wrapped in a `ClassResolver`). As a result of this latter change, we can now also let `NativeMethodFinder` operate on individual classes. We just iterate over all the class file sources in `JNativeScanTask`, and feed individual class models to `NativeMethodFinder`. I think this is a good conceptual simplification of `NativeMethodFinder`,
> 
> Since `ClassResolver` is now only used for system classes, I've removed it, leaving only its single implementation: `SystemClassResolver`.
> 
> Testing: running `langtools_jnativescan` test suite.

This pull request has now been integrated.

Changeset: 8bb0ca49
Author:    Jorn Vernee <jvernee at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/8bb0ca49715d8c713d6319b00a7684564ba57a9b
Stats:     374 lines in 5 files changed: 150 ins; 191 del; 33 mod

8353917: jnativescan: Simplify ClassResolver

Reviewed-by: mcimadamore

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PR: https://git.openjdk.org/jdk/pull/24493