https://www.graalvm.org/ 
class com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24 implements com.oracle.truffle.api.instrumentation.ExecutionEventListener
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24
  super_class: java.lang.Object
{
  final com.oracle.truffle.api.instrumentation.test.InstrumentationTest this$0;
    descriptor: Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final java.util.concurrent.atomic.AtomicReference val$asyncStack;
    descriptor: Ljava/util/concurrent/atomic/AtomicReference;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.api.instrumentation.test.InstrumentationTest, java.util.concurrent.atomic.AtomicReference);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest;Ljava/util/concurrent/atomic/AtomicReference;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24 this
         0: .line 2292
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24.this$0:Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest;
            aload 0 /* this */
            aload 2
            putfield com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24.val$asyncStack:Ljava/util/concurrent/atomic/AtomicReference;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest$24;
    MethodParameters:
                Name  Flags
      this$0          final
      val$asyncStack  final

  public void onEnter(com.oracle.truffle.api.instrumentation.EventContext, com.oracle.truffle.api.frame.VirtualFrame);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/EventContext;Lcom/oracle/truffle/api/frame/VirtualFrame;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24 this
        start local 1 // com.oracle.truffle.api.instrumentation.EventContext ctx
        start local 2 // com.oracle.truffle.api.frame.VirtualFrame frame
         0: .line 2295
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24.val$asyncStack:Ljava/util/concurrent/atomic/AtomicReference;
            invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
            invokestatic org.junit.Assert.assertNull:(Ljava/lang/Object;)V
         1: .line 2296
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24.val$asyncStack:Ljava/util/concurrent/atomic/AtomicReference;
            aload 1 /* ctx */
            invokevirtual com.oracle.truffle.api.instrumentation.EventContext.getInstrumentedNode:()Lcom/oracle/truffle/api/nodes/Node;
            invokevirtual com.oracle.truffle.api.nodes.Node.getRootNode:()Lcom/oracle/truffle/api/nodes/RootNode;
            invokevirtual com.oracle.truffle.api.nodes.RootNode.getCallTarget:()Lcom/oracle/truffle/api/RootCallTarget;
            aload 2 /* frame */
            invokestatic com.oracle.truffle.api.TruffleStackTrace.getAsynchronousStackTrace:(Lcom/oracle/truffle/api/CallTarget;Lcom/oracle/truffle/api/frame/Frame;)Ljava/util/List;
            invokevirtual java.util.concurrent.atomic.AtomicReference.set:(Ljava/lang/Object;)V
         2: .line 2297
            return
        end local 2 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 1 // com.oracle.truffle.api.instrumentation.EventContext ctx
        end local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24 this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest$24;
            0    3     1    ctx  Lcom/oracle/truffle/api/instrumentation/EventContext;
            0    3     2  frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
    MethodParameters:
       Name  Flags
      ctx    
      frame  

  public void onReturnValue(com.oracle.truffle.api.instrumentation.EventContext, com.oracle.truffle.api.frame.VirtualFrame, java.lang.Object);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/EventContext;Lcom/oracle/truffle/api/frame/VirtualFrame;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=0, locals=4, args_size=4
        start local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24 this
        start local 1 // com.oracle.truffle.api.instrumentation.EventContext ctx
        start local 2 // com.oracle.truffle.api.frame.VirtualFrame frame
        start local 3 // java.lang.Object result
         0: .line 2301
            return
        end local 3 // java.lang.Object result
        end local 2 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 1 // com.oracle.truffle.api.instrumentation.EventContext ctx
        end local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest$24;
            0    1     1     ctx  Lcom/oracle/truffle/api/instrumentation/EventContext;
            0    1     2   frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
            0    1     3  result  Ljava/lang/Object;
    MethodParameters:
        Name  Flags
      ctx     
      frame   
      result  

  public void onReturnExceptional(com.oracle.truffle.api.instrumentation.EventContext, com.oracle.truffle.api.frame.VirtualFrame, java.lang.Throwable);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/EventContext;Lcom/oracle/truffle/api/frame/VirtualFrame;Ljava/lang/Throwable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=0, locals=4, args_size=4
        start local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24 this
        start local 1 // com.oracle.truffle.api.instrumentation.EventContext ctx
        start local 2 // com.oracle.truffle.api.frame.VirtualFrame frame
        start local 3 // java.lang.Throwable exception
         0: .line 2305
            return
        end local 3 // java.lang.Throwable exception
        end local 2 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 1 // com.oracle.truffle.api.instrumentation.EventContext ctx
        end local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24 this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    1     0       this  Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest$24;
            0    1     1        ctx  Lcom/oracle/truffle/api/instrumentation/EventContext;
            0    1     2      frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
            0    1     3  exception  Ljava/lang/Throwable;
    MethodParameters:
           Name  Flags
      ctx        
      frame      
      exception  
}
SourceFile: "InstrumentationTest.java"
EnclosingMethod: com.oracle.truffle.api.instrumentation.test.InstrumentationTest.testAsynchronousStacks3:()V
NestHost: com.oracle.truffle.api.instrumentation.test.InstrumentationTest
InnerClasses:
  com.oracle.truffle.api.instrumentation.test.InstrumentationTest$24