RFR: 8315069: Relativize extended_sp in interpreter frames

[Andrew Haley]

On Tue, 29 Aug 2023 12:08:49 GMT, Fredrik Bredberg <fbredberg at openjdk.org> wrote:

> Implementation of relativized extended_sp in interpreter frames for AArch64 and RISC-V.
> 
> By changing the "extended_sp" member in interpreter frames from being an absolute address into an offset that is relative to the frame pointer, we don't need to change the value as we freeze and thaw frames of virtual threads. This is since we might freeze and thaw from and to different worker threads, so the absolute address to locals might change, but the offset from the frame pointer will be constant.
> 
> This subtask only handles "extended_sp". The relativization of other interpreter frame members are handled in other subtasks to JDK-8289296.
> 
> Tested tier1-tier7 on aarch64. RISC-V  was sanity tested using Qemu.

Marked as reviewed by aph (Reviewer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/15468#pullrequestreview-1602714251