Commits on Sep 5, 2024

1. Reset JNI Addresses if FSD on restore …

   If debug is specified on restore, ensure that any proactively compiled
   JNI Methods are reset to their original address.
   
   JNI methods are not compiled under FSD, but they are compiled
   proactively in the checkpoint hook. However, if debug is specified on
   restore, all proactively compiled methods, except for JNI thunks, get
   invalidated. Thus, the extra field of the J9Method of a JNI method
   needs to get reset to whatever the VM initialized them to originally.
   
   This is necessary to ensure an environment that is consistent with FSD
   mode. The invalidation of proactively compiled non-JNI methods (which
   are non-FSD bodies) ensure that non-FSD code does not execute
   post-restore. At the checkpoint hook, only FSD bodies are on the stacks
   of the threads; although the compiler currently does not reuse these
   FSD bodies, they will continue to execute on restore until an OSR
   transition, but this is OK because they are already set up for
   involuntary OSR. The missing piece was the JNI methods, which this
   commit addresses.
   
   Signed-off-by: Irwin D'Souza <[email protected]>

   

   dsouzai committed Sep 5, 2024
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