RFR: 8304425: ClassHierarchyResolver from Reflection [v8]

[Chen Liang]

> Add API to explore Class Hierarchy with a `ClassLoader` or a `Lookup` with proper privileges, with tests.
> 
> This addition is useful in case classes at runtime are not loaded from the system class loader, such as Proxy. This is also useful to APIs that generate bytecode with a `Lookup` object, such as a custom single-abstract-method class implementations from a method handle.
> 
> See https://mail.openjdk.org/pipermail/classfile-api-dev/2023-March/000249.html as well.
> 
> Current questions, which I wish to discuss with @asotona:
> 1. Should the resolver fail fast on `IllegalAccessException` from the lookup? This usually indicates the hierarchy resolver is set up improperly, and proceeding may simply yield verification errors in class loading that are hard to track. For bytecode-generating APIs, throwing access errors for the Lookup eagerly is also more preferable than later silent generation failure.
> 2. Whether the default resolver should be reading from jrt alone, reflection alone, or jrt then reflection. I personally believe reflection alone is more reliable, for classes may redefined with instrumentation or jfr, which may not be reflected in the system resources.
> 3. In addition, I don't think chaining system class loader reflection after system resource retrieval is really meaningful: is there any case where reflection always works while the system resource retrieval always fails?

Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 12 commits:

 - 1. Moved the default resolver to a static method, in anticipation of future changes
   2. Removed SecurityManager related content
   3. Changed ClassHierarchyInfo into an interface
   4. Moved caching method from static to instance method
 - Merge branch 'master' into hierarchy-resolve
 - rename to ofClassLoading/ofResourceParsing
   convert the default class provider to bypass security manager restrictions
 - Merge branch 'master' into hierarchy-resolve
 - Merge branch 'master' into hierarchy-resolve
 - Test both cached and uncached resolvers
 - Update the class hierarchy resolver api as per mailing list last week
 - Merge branch 'master' into hierarchy-resolve
 - Update src/java.base/share/classes/jdk/internal/classfile/impl/ClassHierarchyImpl.java
   
   Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>
 - Make lookup based resolver throw on illegal access eagerly
 - ... and 2 more: https://git.openjdk.org/jdk/compare/101bf229...9e9079fb

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Changes: https://git.openjdk.org/jdk/pull/13082/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13082&range=07
  Stats: 388 lines in 8 files changed: 294 ins; 29 del; 65 mod
  Patch: https://git.openjdk.org/jdk/pull/13082.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13082/head:pull/13082

PR: https://git.openjdk.org/jdk/pull/13082