RFR: 8301248: Less side effects in InstanceRefKlass::trace_reference_gc

[Stefan Karlsson]

On Fri, 27 Jan 2023 15:42:05 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> The InstanceRefKlass::trace_reference_gc function is called when using oop_iterate on a reference object. Since oop_iterate is a general iterator that can be used for anything, including verification code, it would be desirable for this code to not have subtle side effects. We currently apply load barriers which "fix" pointers in the heap. As a result, verification code that was meant to detect bugs, can end up fixing and hiding the bug. This CR aims to address this by limiting the logging to addresses, and not following them.

Marked as reviewed by stefank (Reviewer).

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

PR: https://git.openjdk.org/jdk/pull/12258