RFR: 8264016: [JVMCI] add some thread local fields for use by JVMCI

[Coleen Phillimore]

On Wed, 24 Mar 2021 06:04:15 GMT, Tom Rodriguez <never at openjdk.org> wrote:

>> src/hotspot/share/runtime/thread.hpp line 1020:
>> 
>>> 1018:   intptr_t*  _jvmci_reserved0;
>>> 1019:   intptr_t*  _jvmci_reserved1;
>>> 1020:   oop        _jvmci_reserved_oop0;
>> 
>> Can this use OopStorage? We've been getting rid of oop fields and the corresponding oops_do support.
>
> Wouldn't using OopStorage require an extra level of indirection for the field?

It was https://bugs.openjdk.java.net/browse/JDK-8244997 - you were co-author :)

Maybe this jvmci_reserved_oop0 won't crash for the same reasons.  I don't know that.

I still would like to not see 45 lines of declarations for JVMCI added to JavaThread.  These should be in a separate header file and declared, as in https://bugs.openjdk.java.net/browse/JDK-8137018.  If you promise to fix 8137018, I'm fine with this change.

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PR: https://git.openjdk.java.net/jdk/pull/3147