RFR: 8253763: ParallelObjectIterator should have virtual destructor

Tue Sep 29 07:14:39 UTC 2020

The ParallelObjectIterator should have virtual destructor, since implementations of
CollectedHeap::parallel_object_iterator() returns the base type, which is later passed to the delete operator.

Today both G1 and Shenandoah leaks memory here. I noticed this bug when when implementing
ZCollectedHeap::parallel_object_iterator(). Bug was introduced in JDK-8215624.

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Commit messages:
 - ParallelObjectIterator should have virtual destructor

Changes: https://git.openjdk.java.net/jdk/pull/395/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=395&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253763
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/395.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/395/head:pull/395

PR: https://git.openjdk.java.net/jdk/pull/395