https://www.graalvm.org/ 
public interface com.oracle.truffle.api.frame.FrameInstance
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.frame.FrameInstance
  super_class: java.lang.Object
{
  public abstract com.oracle.truffle.api.frame.Frame getFrame(com.oracle.truffle.api.frame.FrameInstance$FrameAccess);
    descriptor: (Lcom/oracle/truffle/api/frame/FrameInstance$FrameAccess;)Lcom/oracle/truffle/api/frame/Frame;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
        Name  Flags
      access  

  public abstract boolean isVirtualFrame();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract com.oracle.truffle.api.nodes.Node getCallNode();
    descriptor: ()Lcom/oracle/truffle/api/nodes/Node;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract com.oracle.truffle.api.CallTarget getCallTarget();
    descriptor: ()Lcom/oracle/truffle/api/CallTarget;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "FrameInstance.java"
NestMembers:
  com.oracle.truffle.api.frame.FrameInstance$FrameAccess
InnerClasses:
  public final FrameAccess = com.oracle.truffle.api.frame.FrameInstance$FrameAccess of com.oracle.truffle.api.frame.FrameInstance