https://www.graalvm.org/ 
class com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode extends com.oracle.truffle.api.nodes.Node
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode
  super_class: com.oracle.truffle.api.nodes.Node
{
  com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode testChild;
    descriptor: Lcom/oracle/truffle/api/debug/test/DebugStackFrameTest$TestStackLanguage$TestNode;
    flags: (0x0000) 
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.nodes.Node$Child()

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode this
         0: .line 755
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.nodes.Node.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/debug/test/DebugStackFrameTest$TestStackLanguage$TestNode;

  public java.lang.Object execute(com.oracle.truffle.api.frame.VirtualFrame);
    descriptor: (Lcom/oracle/truffle/api/frame/VirtualFrame;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
         0: .line 760
            aload 0 /* this */
            getfield com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode.testChild:Lcom/oracle/truffle/api/debug/test/DebugStackFrameTest$TestStackLanguage$TestNode;
            ifnull 2
         1: .line 761
            aload 0 /* this */
            getfield com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode.testChild:Lcom/oracle/truffle/api/debug/test/DebugStackFrameTest$TestStackLanguage$TestNode;
            aload 1 /* frame */
            invokevirtual com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode.execute:(Lcom/oracle/truffle/api/frame/VirtualFrame;)Ljava/lang/Object;
            areturn
         2: .line 763
      StackMap locals:
      StackMap stack:
            bipush 42
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            areturn
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 0 // com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lcom/oracle/truffle/api/debug/test/DebugStackFrameTest$TestStackLanguage$TestNode;
            0    3     1  frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
    MethodParameters:
       Name  Flags
      frame  

  protected com.oracle.truffle.api.nodes.DirectCallNode getCallNode();
    descriptor: ()Lcom/oracle/truffle/api/nodes/DirectCallNode;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode this
         0: .line 768
            aconst_null
            areturn
        end local 0 // com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/debug/test/DebugStackFrameTest$TestStackLanguage$TestNode;
}
SourceFile: "DebugStackFrameTest.java"
NestHost: com.oracle.truffle.api.debug.test.DebugStackFrameTest
InnerClasses:
  final TestStackLanguage = com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage of com.oracle.truffle.api.debug.test.DebugStackFrameTest
  private TestNode = com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage$TestNode of com.oracle.truffle.api.debug.test.DebugStackFrameTest$TestStackLanguage
  public abstract Child = com.oracle.truffle.api.nodes.Node$Child of com.oracle.truffle.api.nodes.Node