RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning [v16]

[Patricio Chilano Mateo]

On Tue, 29 Oct 2024 20:57:48 GMT, Dean Long <dlong at openjdk.org> wrote:

>> No, it just happens to be stored at the sender_sp marker. We were already making room for two words but only using one.
>
> `sender_sp_offset` is listed under "All frames", but I guess that's wrong and should be changed.  Can we fix the comments to match x86, which lists this offset under "non-interpreter frames"?

I think aarch64 is the correct one. For interpreter frames we also have a sender_sp() that we get through that offset value: https://github.com/openjdk/jdk/blob/7404ddf24a162cff445cd0a26aec446461988bc8/src/hotspot/cpu/x86/frame_x86.cpp#L458
I think the confusion is because we also have interpreter_frame_sender_sp_offset where we store the unextended sp.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1823495787