RFR: 7903579: JOL: Heap dump parser handles superclasses incorrectly

Mon Nov 13 11:31:38 UTC 2023

Current heap dump parser relies on class records to appear after the superclass records appear. This does not actually hold for hprof: we can emit the subclass records first, and only then emit the superclass records.

Therefore, current heap dump reader is broken when it encounters hierarchical classes. It would then underestimate the footprint of subclasses, because it does not record superclasses.

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jol/pull/53/files
 Webrev: https://webrevs.openjdk.org/?repo=jol&pr=53&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903579
  Stats: 54 lines in 2 files changed: 37 ins; 6 del; 11 mod
  Patch: https://git.openjdk.org/jol/pull/53.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/53/head:pull/53

PR: https://git.openjdk.org/jol/pull/53