[lworld] Integrated: 8373567: [lworld] Move array copy exception throwing out of GC barriers

[Stefan Karlsson]

On Fri, 12 Dec 2025 09:16:44 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> The lworld branch has support for null-restricted arrays, and to support this code has been adjacent to the code that perform array copy check casts. The code that performs the check casts used to be located inside the GC access barriers, but the code that finally threw exceptions were located in the runtime code. In the lworld branch the code that throws the check cast exception and the new null pointer exception has been moved into the GC access barriers.
> 
> I propose that we revert back to the old style where the exception throwing was somewhat decoupled from the GC access barriers.

This pull request has now been integrated.

Changeset: c661c30f
Author:    Stefan Karlsson <stefank at openjdk.org>
Committer: David Simms <dsimms at openjdk.org>
URL:       https://git.openjdk.org/valhalla/commit/c661c30fff54fa4a83f5c10cda24bf4a9b031632
Stats:     312 lines in 14 files changed: 88 ins; 62 del; 162 mod

8373567: [lworld] Move array copy exception throwing out of GC barriers

Reviewed-by: aboldtch, tschatzl, fparain, heidinga

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PR: https://git.openjdk.org/valhalla/pull/1792