RFR: 8252505: C1/C2 compiler support for blackholes [v24]

[Andrew Haley]

On 08/12/2020 10:42, Thomas Wuerthinger wrote:

>> I don't think the OpenJDK project has a responsibility to justify
>> its implementation details to other projects which try to emulate
>> its behaviour.

> My understanding as a member of the OpenJDK community was that a
> GitHub PR like this is the appropriate place to engage in
> collaborative discussions. Let me know if this kind of engagement is
> undesirable.

I hope that Volker will forgive me if I've misinterpreted him, but I
don't think that it's a matter of where this discussion occurs.
OpenJDK has to be able to make its own decisions about its internal
implementation details without regard to other projects which choose
to emulate all of the behaviour of OpenJDK. I think he's right about
this. We can't keep looking over our shoulders to see what projects
who consume some of OpenJDK might be doing.

On the other hand, I believe that blackhole is a useful thing to have
beyond merely JMH. (For example, it may lead to a sane implementation
of Reference.reachabilityFence(). That would be nice.)

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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