On Tue, 29 Apr 2025 22:59:29 GMT, Ioi Lam <ik...@openjdk.org> wrote: > This is a general fix for all the "points to a static field that may hold a > different value" failures related to `java/lang/invoke/MethodHandleImpl`. > E.g., [JDK-8354840](https://bugs.openjdk.org/browse/JDK-8354840), > [JDK-8353330](https://bugs.openjdk.org/browse/JDK-8353330). > > AOT-cached method handles quite often refer to the static fields in > `MethodHandleImpl` or its inner classes. In the production run, if the value > of these static field changes, we may have unexpected behavior related to > identity of objects in these static fields. `CDSHeapVerifier` makes a very > conservative check for such static fields, but sometimes gives false > positives (as in the above two JBS issues) > > In this PR, we AOT-initialize `MethodHandleImpl` and its inner classes. This > is a more authentic snapshot of the state of `java.lang.invoke` during the > assembly phase. We also avoid the need to add and maintain entries in the > `cdsHeapVerifier.cpp` table. > > I also added more code in `MethodHandleTest.java` to simulate potential usage > patterns of `MethodHandle` by the Java core libraries. Hopefully this will > reduce the likelihood for innocent core lib changes breaking the AOT assembly > phase.
This pull request has now been integrated. Changeset: 591e71eb Author: Ioi Lam <ik...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/591e71ebe501e6e88249f46efda4134277f29b08 Stats: 181 lines in 8 files changed: 169 ins; 5 del; 7 mod 8354890: AOT-initialize j.l.i.MethodHandleImpl and inner classes Reviewed-by: liach, vlivanov ------------- PR: https://git.openjdk.org/jdk/pull/24956
