https://www.graalvm.org/ 
class com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13 implements com.oracle.truffle.api.instrumentation.ExecutionEventNodeFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13
  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.lang.StringBuilder val$tags;
    descriptor: Ljava/lang/StringBuilder;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.api.instrumentation.test.InstrumentationTest, java.lang.StringBuilder);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest;Ljava/lang/StringBuilder;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13 this
         0: .line 1602
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13.this$0:Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest;
            aload 0 /* this */
            aload 2
            putfield com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13.val$tags:Ljava/lang/StringBuilder;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest$13;
    MethodParameters:
          Name  Flags
      this$0    final
      val$tags  final

  public com.oracle.truffle.api.instrumentation.ExecutionEventNode create(com.oracle.truffle.api.instrumentation.EventContext);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/EventContext;)Lcom/oracle/truffle/api/instrumentation/ExecutionEventNode;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=4, args_size=2
        start local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13 this
        start local 1 // com.oracle.truffle.api.instrumentation.EventContext ctx
         0: .line 1606
            aload 1 /* ctx */
            ldc Lcom/oracle/truffle/api/instrumentation/StandardTags$RootTag;
            invokevirtual com.oracle.truffle.api.instrumentation.EventContext.hasTag:(Ljava/lang/Class;)Z
            istore 2 /* isRoot */
        start local 2 // boolean isRoot
         1: .line 1607
            aload 1 /* ctx */
            ldc Lcom/oracle/truffle/api/instrumentation/StandardTags$RootBodyTag;
            invokevirtual com.oracle.truffle.api.instrumentation.EventContext.hasTag:(Ljava/lang/Class;)Z
            istore 3 /* isBody */
        start local 3 // boolean isBody
         2: .line 1608
            new com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13$1
            dup
            aload 0 /* this */
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13.val$tags:Ljava/lang/StringBuilder;
            iload 2 /* isRoot */
            iload 3 /* isBody */
            invokespecial com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13$1.<init>:(Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest$13;Ljava/lang/StringBuilder;ZZ)V
            areturn
        end local 3 // boolean isBody
        end local 2 // boolean isRoot
        end local 1 // com.oracle.truffle.api.instrumentation.EventContext ctx
        end local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest$13;
            0    3     1     ctx  Lcom/oracle/truffle/api/instrumentation/EventContext;
            1    3     2  isRoot  Z
            2    3     3  isBody  Z
    MethodParameters:
      Name  Flags
      ctx   
}
SourceFile: "InstrumentationTest.java"
EnclosingMethod: com.oracle.truffle.api.instrumentation.test.InstrumentationTest.testRootBodies:()V
NestHost: com.oracle.truffle.api.instrumentation.test.InstrumentationTest
InnerClasses:
  public final RootBodyTag = com.oracle.truffle.api.instrumentation.StandardTags$RootBodyTag of com.oracle.truffle.api.instrumentation.StandardTags
  public final RootTag = com.oracle.truffle.api.instrumentation.StandardTags$RootTag of com.oracle.truffle.api.instrumentation.StandardTags
  com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13
  com.oracle.truffle.api.instrumentation.test.InstrumentationTest$13$1