RFR (S) 8247296: Optimize JVM_GetDeclaringClass

David Holmes david.holmes at oracle.com
Fri Jul 24 03:49:58 UTC 2020

Bug: https://bugs.openjdk.java.net/browse/JDK-8247296
webrev: http://cr.openjdk.java.net/~dholmes/8247296/webrev/

Please review this simple optimization contributed by Christoph Dreis in 
its initial form and then expanded by me to cover other cases in jvm.cpp.


There is a common pattern of code of the form:

if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||

which resolves cls twice. There are also duplicate calls to as_Klass 
that can be removed in a couple of cases.

Testing: tiers 1 - 3


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