RFR: 8259036: Failed JfrVersionSystem invariant when VM built with -fno-elide-constructors

[Erik Gahlin]

On Thu, 14 Jan 2021 17:16:16 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

> Greetings,
> 
> please review this changeset to let JFR work in situations where the VM is built with -fno-elide-constructors.
> 
> The original means to interface with the JfrVersionSystem employed handles, but to work correctly, the handles relied on Return Value Optimization (RVO), which was a lazy assumption on my part.
> 
> The handles will now employ copy-and-swap for reference counting. 
> 
> Testing: jdk_jfr with (and without) build option -fno-elide-constructors
> 
> Thanks to Kim Barrett @kimbarrett for filing this issue.
> 
> Thank you
> Markus

Marked as reviewed by egahlin (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2083