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

[Vladimir Kozlov]

Looks good.

Thanks,
Vladimir

On 8/18/17 11:40 AM, 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