[10] RFR(S) 8181858: [JVMCI] JVMCI should update the trap counters when invalidating for Reason_not_compiled_exception_handler

Tom Rodriguez tom.rodriguez at oracle.com
Mon Aug 21 17:43:36 UTC 2017

Can I get a review for this?  It basically just moves the code and adds 
an MDO counter increment in the middle of the copy.


Tom Rodriguez wrote:
> http://cr.openjdk.java.net/~never/8181858/webrev
> https://bugs.openjdk.java.net/browse/JDK-8181858
> JVMCI permits trapping when exception handlers haven't been compiled
> into the generated code. When this is a normal uncommon trap the counter
> in the MDO is updated but when the invalidation is forced during
> exception dispatch the counter isn't updated. This leads to
> invalidate/recompile cycles that will never terminate because the
> compiler doesn't know why the previous invalidation happened. Tested
> with a Graal unit test
> https://github.com/graalvm/graal/commit/d92dc3f90c0ba1502a9e28a4faf7973ffd9a1889#diff-96a2a5e9fc63d48d47a9ef9722a7c3d9R102.
> tom

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