RFR: 8278207: G1: Tighten verification in G1ResetSkipCompactingClosure

[Albert Mingkun Yang]

On Tue, 7 Dec 2021 09:09:02 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

> If we want more documentation I would rather see a comment explaining in what situations regions might be marked as "skip compacting".

These asserts serve as "runnable" documentation -- less likely to deviate from the actual code.

> One other question, can we ever end up here with a closed archive region? Those are marked SkipMarking so I guess they should be filtered out above?

Yes; you are right. I should put `ShouldNotReachHere()` for closed-archive regions.

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

PR: https://git.openjdk.java.net/jdk/pull/6698