https://www.graalvm.org/ 
class com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 extends com.oracle.truffle.api.nodes.RootNode
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2
  super_class: com.oracle.truffle.api.nodes.RootNode
{
  final com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage this$1;
    descriptor: Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final com.oracle.truffle.api.source.Source val$code;
    descriptor: Lcom/oracle/truffle/api/source/Source;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final java.lang.CharSequence val$codeCharacters;
    descriptor: Ljava/lang/CharSequence;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage, com.oracle.truffle.api.TruffleLanguage, com.oracle.truffle.api.source.Source, java.lang.CharSequence);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage;Lcom/oracle/truffle/api/TruffleLanguage;Lcom/oracle/truffle/api/source/Source;Ljava/lang/CharSequence;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=5, args_size=5
        start local 0 // com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 this
        start local 2 // com.oracle.truffle.api.TruffleLanguage $anonymous0
         0: .line 192
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2.this$1:Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage;
            aload 0 /* this */
            aload 3
            putfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2.val$code:Lcom/oracle/truffle/api/source/Source;
            aload 0 /* this */
            aload 4
            putfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2.val$codeCharacters:Ljava/lang/CharSequence;
            aload 0 /* this */
            aload 2 /* $anonymous0 */
            invokespecial com.oracle.truffle.api.nodes.RootNode.<init>:(Lcom/oracle/truffle/api/TruffleLanguage;)V
            return
        end local 2 // com.oracle.truffle.api.TruffleLanguage $anonymous0
        end local 0 // com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    1     0         this  Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage$2;
            0    1     2  $anonymous0  Lcom/oracle/truffle/api/TruffleLanguage<*>;
    MethodParameters:
                    Name  Flags
      this$0              final
      $anonymous0         
      val$code            final
      val$codeCharacters  final

  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=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
         0: .line 196
            aload 0 /* this */
            invokevirtual com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2.runApp:()Ljava/lang/Object;
            areturn
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 0 // com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage$2;
            0    1     1  frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
    MethodParameters:
       Name  Flags
      frame  

  private java.lang.Object runApp();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=6, locals=4, args_size=1
        start local 0 // com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 this
         0: .line 201
            new com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2$1
            dup
            aload 0 /* this */
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2.this$1:Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage;
            invokestatic com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage.access$0:(Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage;)Lcom/oracle/truffle/api/test/polyglot/ProxyLanguage;
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2.val$code:Lcom/oracle/truffle/api/source/Source;
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2.val$codeCharacters:Ljava/lang/CharSequence;
            invokespecial com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2$1.<init>:(Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage$2;Lcom/oracle/truffle/api/TruffleLanguage;Lcom/oracle/truffle/api/source/Source;Ljava/lang/CharSequence;)V
            astore 1 /* codeExecRoot */
        start local 1 // com.oracle.truffle.api.nodes.RootNode codeExecRoot
         1: .line 216
            invokestatic com.oracle.truffle.api.Truffle.getRuntime:()Lcom/oracle/truffle/api/TruffleRuntime;
            aload 1 /* codeExecRoot */
            invokeinterface com.oracle.truffle.api.TruffleRuntime.createCallTarget:(Lcom/oracle/truffle/api/nodes/RootNode;)Lcom/oracle/truffle/api/RootCallTarget;
            astore 2 /* codeExec */
        start local 2 // com.oracle.truffle.api.CallTarget codeExec
         2: .line 217
            aload 2 /* codeExec */
            iconst_0
            anewarray java.lang.Object
            invokeinterface com.oracle.truffle.api.CallTarget.call:([Ljava/lang/Object;)Ljava/lang/Object;
            pop
         3: .line 219
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2.this$1:Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage;
            getfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage.executionLatches:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.util.concurrent.CountDownLatch
            invokevirtual java.util.concurrent.CountDownLatch.countDown:()V
         4: .line 222
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2.this$1:Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage;
            getfield com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage.executionLatches:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.util.concurrent.CountDownLatch
            invokevirtual java.util.concurrent.CountDownLatch.await:()V
         5: .line 223
            goto 7
      StackMap locals: com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 com.oracle.truffle.api.nodes.RootNode com.oracle.truffle.api.CallTarget
      StackMap stack: java.lang.InterruptedException
         6: pop
         7: .line 225
      StackMap locals:
      StackMap stack:
            aload 2 /* codeExec */
            iconst_0
            anewarray java.lang.Object
            invokeinterface com.oracle.truffle.api.CallTarget.call:([Ljava/lang/Object;)Ljava/lang/Object;
            astore 3 /* ret */
        start local 3 // java.lang.Object ret
         8: .line 226
            aload 3 /* ret */
            areturn
        end local 3 // java.lang.Object ret
        end local 2 // com.oracle.truffle.api.CallTarget codeExec
        end local 1 // com.oracle.truffle.api.nodes.RootNode codeExecRoot
        end local 0 // com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    9     0          this  Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage$2;
            1    9     1  codeExecRoot  Lcom/oracle/truffle/api/nodes/RootNode;
            2    9     2      codeExec  Lcom/oracle/truffle/api/CallTarget;
            8    9     3           ret  Ljava/lang/Object;
      Exception table:
        from    to  target  type
           4     5       6  Class java.lang.InterruptedException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()

  public com.oracle.truffle.api.source.SourceSection getSourceSection();
    descriptor: ()Lcom/oracle/truffle/api/source/SourceSection;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 this
         0: .line 231
            ldc "proxyLanguage"
            ldc "test"
            ldc "name"
            invokestatic com.oracle.truffle.api.source.Source.newBuilder:(Ljava/lang/String;Ljava/lang/CharSequence;Ljava/lang/String;)Lcom/oracle/truffle/api/source/Source$LiteralBuilder;
            invokevirtual com.oracle.truffle.api.source.Source$LiteralBuilder.build:()Lcom/oracle/truffle/api/source/Source;
            iconst_1
            invokevirtual com.oracle.truffle.api.source.Source.createSection:(I)Lcom/oracle/truffle/api/source/SourceSection;
            areturn
        end local 0 // com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/instrumentation/test/GR25718Test$RunningAppLanguage$2;
}
SourceFile: "GR25718Test.java"
EnclosingMethod: com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage.parse:(Lcom/oracle/truffle/api/TruffleLanguage$ParsingRequest;)Lcom/oracle/truffle/api/CallTarget;
NestHost: com.oracle.truffle.api.instrumentation.test.GR25718Test
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives
  public final ParsingRequest = com.oracle.truffle.api.TruffleLanguage$ParsingRequest of com.oracle.truffle.api.TruffleLanguage
  RunningAppLanguage = com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage of com.oracle.truffle.api.instrumentation.test.GR25718Test
  com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2
  com.oracle.truffle.api.instrumentation.test.GR25718Test$RunningAppLanguage$2$1
  public final LiteralBuilder = com.oracle.truffle.api.source.Source$LiteralBuilder of com.oracle.truffle.api.source.Source