RFR: 8265129: Add intrinsic support for JVM.getClassId [v10]

[Denghui Dong]

On Fri, 21 May 2021 11:52:50 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> src/hotspot/share/jfr/jfr.hpp line 59:
>> 
>>> 57: 
>>> 58:   // get_class_id intrinsic support
>>> 59:   static void trace_id_load_barrier(Klass* klass);
>> 
>> I think we can make this general, because it is not necessarily specialized for the intrinsic use. Can we rename this to "get_class_id(const Klass* klass): instead? Then we can remove the comment // get_class_id intrinsic support., thanks
>
> Hmm, perhaps that was not such a good idea after all - it would require that you have tested for tagging at the call site. But "get_class_id_intrinsic(const Klass* klass):" might perhaps be ok.

Good idea, updated.

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PR: https://git.openjdk.java.net/jdk/pull/3470