Review Request: JDK-8185148: [MVT]'s isValueClass causes all non-MVT enabled JVM executions to have an InstanceKlass created for __Value reference

Mandy Chung mandy.chung at
Fri Jul 28 04:56:45 UTC 2017

A class referencing java.lang.__Value would fail verification when value type is not enabled.  Class::isValueType and MinimalValueTypes_1_0::getValueType both references java.lang.__Value but they may be loaded when value type is not enabled.  VerifyError that Tobias has ran into [1] is related to this issue.

A simple fix is to refactor the reference to java.lang.__Value in a separate class that will only be loaded when -XX:+EnableMVT and —XX:+EnableValhalla is set.  We may look into a cleaner fix in the future.



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