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List:       openjdk-serviceability-dev
Subject:    Integrated: 8315966: Relativize initial_sp in interpreter frames
From:       Fredrik Bredberg <fbredberg () openjdk ! org>
Date:       2023-09-27 13:18:26
Message-ID: EXtg-4IcJ9OpBINfY8Kfhc_EkQYsF5aE2ZKs7ivVXRM=.4a29e7de-47bd-40c5-a9a2-7878f25643ea () github ! com
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On Tue, 19 Sep 2023 09:00:01 GMT, Fredrik Bredberg <fbredberg@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.

This pull request has now been integrated.

Changeset: 347bd15e
Author:    Fredrik Bredberg <fbredberg@openjdk.org>
Committer: Coleen Phillimore <coleenp@openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/347bd15e49f5632e16d0ae4dd7240a3648baf539
                
Stats:     202 lines in 30 files changed: 84 ins; 48 del; 70 mod

8315966: Relativize initial_sp in interpreter frames

Reviewed-by: fyang, mdoerr, pchilanomate

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

PR: https://git.openjdk.org/jdk/pull/15815


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