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.
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2020-June/040025.html
There is a common pattern of code of the form:
if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
!
java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass())
{
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
Thanks,
David
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