On Tue, 19 Sep 2023 09:00:01 GMT, Fredrik Bredberg <fbredb...@openjdk.org> wrote:
> Relativize initial_sp in interpreter frames. > > By changing the "initial_sp" (AKA "monitor_block_top" or "monitors" on > PowerPC) 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 relativization of "initial_sp" and > "monitor_block_top" since it's the same slot in interpreter frames (roughly > the same as "monitors" on PowerPC). Relativization of other interpreter frame > members are handled in other subtasks to JDK-8289296. > > Tested tier1-tier7 on supported platforms. The rest was sanity tested using > Qemu. Calling @TheRealMDoerr and @RealFYang for PowerPC and RISC-V reviews. I've done basic loom related testing on both PowerPC and RISC-V. ------------- PR Comment: https://git.openjdk.org/jdk/pull/15815#issuecomment-1725431646
