[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
Fri Aug 18 18:40:01 UTC 2017


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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