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  1. JDK
  2. JDK-8263776

[JVMCI] add helper to perform Java upcalls

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        In certain situations it would be useful to call up to a Java helper from generated code. Because of the way stack walking works this requires an intervening stub frame which means it has to go through the JVM. So we need a new JVMCIRuntime entry point that allows invoking a static Java method with an optional argument and possibly returning a value. The constraints were chosen for simplicity of implementation and because nothing more complex was needed.

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                Assignee:
                never Tom Rodriguez
                Reporter:
                never Tom Rodriguez
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