Integrated: 8316229: Enhance class initialization logging

[David Holmes]

On Tue, 19 Sep 2023 06:33:02 GMT, David Holmes <dholmes at openjdk.org> wrote:

> This change adds some additional debug logging to the class linking and initialization process. It was useful in diagnosing the deadlock described by:
> 
> https://bugs.openjdk.org/browse/JDK-8316469
> 
> See the example output in JBS issue.
> 
> The changes are mostly uncontroversial but I needed to expose a way to access the init thread's name, which can't use the regular `name()` method as the safety check doesn't recognise the calling context as being safe.
> 
> Testing:
>  - manual examination of logging output
>  - ran the only test that enables class+init logging: runtime/logging/ClassInitializationTest.java (no change as expected)
>  - tiers1-3 sanity
> 
> Thanks.

This pull request has now been integrated.

Changeset: 84124794
Author:    David Holmes <dholmes at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/84124794c2ff70ba22cbfbf1ff01cf4d935896bd
Stats:     73 lines in 4 files changed: 69 ins; 1 del; 3 mod

8316229: Enhance class initialization logging

Reviewed-by: shade, coleenp

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PR: https://git.openjdk.org/jdk/pull/15809