RFR: 8341608: jdeps in JDK 23 crashes when parsing signatures while jdeps in JDK 22 works fine

[Chen Liang]

When jdeps was migrated from old classfile to ClassFile API, the parsing semantic changed - error checks are now made lazily, and nested crashes from malformed signature or other problems is now latent, after a `ClassModel` instance is available. (The old error check existed only for constructing a `ClassModel`)

To address this issue, I have updated the way of iterating class files to be handler/consumer based like in the ClassFile API. This has the advantage that when one invocation of the handler fails of a `ClassFileError`, other invocations for other class files can proceed, and the exception handler has sufficient information to report a useful message indicating the source of error.

For the particular example of examining a proguard processed `dummy-scala.jar`, here is the new output of `jdeps dummy-scala.jar`:

Warning: com.sun.tools.jdeps.Dependencies$ClassFileError: Unexpected character ; at position 59, expected an identifier: Lscala/collection/immutable/TreeMap$TreeMapBuilder<TA;TB;>.;: scala/collection/immutable/TreeMap$TreeMapBuilder.class (dummy-scala.jar)
Warning: com.sun.tools.jdeps.Dependencies$ClassFileError: Unexpected character ; at position 49, expected an identifier: Lscala/collection/parallel/mutable/ParArray<TT;>.;: scala/collection/parallel/mutable/ParArray.class (dummy-scala.jar)


Now, jdeps shows the bad class files. Inspection into the files reveal that proguard incorrectly deleted the simple class names with trailing `$`, for example, the original signature of the broken ParArray was `Lscala/collection/parallel/mutable/ParArray<TT;>.ParArrayIterator$;`, so the `ParArrayIterator$` part was incorrectly dropped by proguard.

Testing: langtools/tools/jdeps.

-------------

Commit messages:
 - 8341608: jdeps in JDK 23 crashes when parsing signatures while jdeps in JDK 22 works fine

Changes: https://git.openjdk.org/jdk/pull/24604/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24604&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341608
  Stats: 167 lines in 3 files changed: 16 ins; 106 del; 45 mod
  Patch: https://git.openjdk.org/jdk/pull/24604.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24604/head:pull/24604

PR: https://git.openjdk.org/jdk/pull/24604