https://www.graalvm.org/ 
class com.oracle.truffle.polyglot.PolyglotThread$1 implements com.oracle.truffle.polyglot.PolyglotThread$PolyglotThreadRunnable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.polyglot.PolyglotThread$1
  super_class: java.lang.Object
{
  final com.oracle.truffle.polyglot.PolyglotThread this$0;
    descriptor: Lcom/oracle/truffle/polyglot/PolyglotThread;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.polyglot.PolyglotThread);
    descriptor: (Lcom/oracle/truffle/polyglot/PolyglotThread;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.polyglot.PolyglotThread$1 this
         0: .line 83
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.polyglot.PolyglotThread$1.this$0:Lcom/oracle/truffle/polyglot/PolyglotThread;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.polyglot.PolyglotThread$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/polyglot/PolyglotThread$1;
    MethodParameters:
        Name  Flags
      this$0  final

  public void execute();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.polyglot.PolyglotThread$1 this
         0: .line 87
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotThread$1.this$0:Lcom/oracle/truffle/polyglot/PolyglotThread;
            invokestatic com.oracle.truffle.polyglot.PolyglotThread.access$0:(Lcom/oracle/truffle/polyglot/PolyglotThread;)V
         1: .line 88
            return
        end local 0 // com.oracle.truffle.polyglot.PolyglotThread$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/polyglot/PolyglotThread$1;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
}
SourceFile: "PolyglotThread.java"
EnclosingMethod: com.oracle.truffle.polyglot.PolyglotThread.run:()V
NestHost: com.oracle.truffle.polyglot.PolyglotThread
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives
  com.oracle.truffle.polyglot.PolyglotThread$1
  private abstract PolyglotThreadRunnable = com.oracle.truffle.polyglot.PolyglotThread$PolyglotThreadRunnable of com.oracle.truffle.polyglot.PolyglotThread