RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning [v12]

[Coleen Phillimore]

On Sat, 26 Oct 2024 01:51:12 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Patricio Chilano Mateo has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Restore use of atPointA in test StopThreadTest.java
>>  - remove interruptible check from conditional in Object::wait
>
> src/hotspot/cpu/aarch64/stackChunkFrameStream_aarch64.inline.hpp line 119:
> 
>> 117:   return  mask.num_oops()
>> 118:         + 1 // for the mirror oop
>> 119:         + (f.interpreter_frame_method()->is_native() ? 1 : 0) // temp oop slot
> 
> Where is this temp oop slot set and used?

It's the offset of the mirror passed to static native calls.  It pre-existed saving the mirror in all frames to keep the Method alive, and is duplicated.  I think this could be cleaned up someday, which would remove this special case.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1819394224