https://www.graalvm.org/ 
public interface com.oracle.truffle.api.RootCallTarget extends com.oracle.truffle.api.CallTarget
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.RootCallTarget
  super_class: java.lang.Object
{
  public abstract com.oracle.truffle.api.nodes.RootNode getRootNode();
    descriptor: ()Lcom/oracle/truffle/api/nodes/RootNode;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "RootCallTarget.java"