https://www.graalvm.org/ 
public abstract class com.oracle.truffle.api.dsl.test.examples.Interop$TruffleObjectOperation extends com.oracle.truffle.api.nodes.Node
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.dsl.test.examples.Interop$TruffleObjectOperation
  super_class: com.oracle.truffle.api.nodes.Node
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.examples.Interop$TruffleObjectOperation this
         0: .line 103
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.nodes.Node.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.dsl.test.examples.Interop$TruffleObjectOperation this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/examples/Interop$TruffleObjectOperation;

  public abstract boolean accept(com.oracle.truffle.api.dsl.test.examples.Interop$TruffleObject);
    descriptor: (Lcom/oracle/truffle/api/dsl/test/examples/Interop$TruffleObject;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
        Name  Flags
      object  

  public abstract java.lang.Object execute(com.oracle.truffle.api.frame.VirtualFrame, java.lang.Object, java.lang.Object);
    descriptor: (Lcom/oracle/truffle/api/frame/VirtualFrame;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
        Name  Flags
      frame   
      target  
      value   
}
SourceFile: "Interop.java"
NestHost: com.oracle.truffle.api.dsl.test.examples.Interop
InnerClasses:
  public TruffleObject = com.oracle.truffle.api.dsl.test.examples.Interop$TruffleObject of com.oracle.truffle.api.dsl.test.examples.Interop
  public abstract TruffleObjectOperation = com.oracle.truffle.api.dsl.test.examples.Interop$TruffleObjectOperation of com.oracle.truffle.api.dsl.test.examples.Interop