RFR: JDK-8232806: The LambdaMetaFactory eagerly initializes generated lambdas
Vojin Jovanovic
VOJIN.JOVANOVIC at ORACLE.COM
Mon Oct 28 18:10:25 UTC 2019
Hi all,
This email proposes a change to the LambdaMetaFactory that allows to disable eager initialization (with Unsafe) of generated lambdas. This is needed by the GraalVM Native Image, as initialization of lambdas during AOT compilation breaks our heap snapshotting (via initialization of interfaces with default methods that are super-types of a lambda). We have started from the original proposal that stores lambda instances in the static fields
https://github.com/graalvm/labs-openjdk-11/commit/00b9ecd85dedd0411837eee33635dd83e8b7def8
and initializes them with Unsafe as an optimization
https://github.com/graalvm/labs-openjdk-11/commit/273e8590a7b57c0c10d9213ca9e0ba581e2817b8
After the discussion with Brian Goetz, we have trimmed down to the following change:
https://bugs.openjdk.java.net/secure/attachment/85247/lambda-disable-initialization.diff
The evolution of this change can be found at the issue:
https://bugs.openjdk.java.net/browse/JDK-8232806
Cheers,
- Vojin
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