https://www.graalvm.org/ 
class com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage extends com.oracle.truffle.js.test.polyglot.TestLanguage
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage
  super_class: com.oracle.truffle.js.test.polyglot.TestLanguage
{
  private final java.lang.String[] argumentNames;
    descriptor: [Ljava/lang/String;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(java.lang.String[]);
    descriptor: ([Ljava/lang/String;)V
    flags: (0x0080) ACC_VARARGS
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage this
        start local 1 // java.lang.String[] argumentNames
         0: .line 300
            aload 0 /* this */
            invokespecial com.oracle.truffle.js.test.polyglot.TestLanguage.<init>:()V
         1: .line 301
            aload 0 /* this */
            aload 1 /* argumentNames */
            putfield com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage.argumentNames:[Ljava/lang/String;
         2: .line 302
            return
        end local 1 // java.lang.String[] argumentNames
        end local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    3     0           this  Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ProxyParsingLanguage;
            0    3     1  argumentNames  [Ljava/lang/String;
    MethodParameters:
               Name  Flags
      argumentNames  

  protected com.oracle.truffle.api.CallTarget parse(com.oracle.truffle.api.TruffleLanguage$ParsingRequest);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$ParsingRequest;)Lcom/oracle/truffle/api/CallTarget;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=6, locals=3, args_size=2
        start local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$ParsingRequest request
         0: .line 306
            aload 1 /* request */
            invokevirtual com.oracle.truffle.api.TruffleLanguage$ParsingRequest.getSource:()Lcom/oracle/truffle/api/source/Source;
            invokevirtual com.oracle.truffle.api.source.Source.getCharacters:()Ljava/lang/CharSequence;
            invokeinterface java.lang.CharSequence.toString:()Ljava/lang/String;
            astore 2 /* jsCode */
        start local 2 // java.lang.String jsCode
         1: .line 322
            invokestatic com.oracle.truffle.api.Truffle.getRuntime:()Lcom/oracle/truffle/api/TruffleRuntime;
            new com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage$1ParseJsRootNode
            dup
            aload 0 /* this */
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage.languageInstance:Lcom/oracle/truffle/js/test/polyglot/TestLanguage;
            aload 2 /* jsCode */
            invokespecial com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage$1ParseJsRootNode.<init>:(Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ProxyParsingLanguage;Lcom/oracle/truffle/api/TruffleLanguage;Ljava/lang/String;)V
            invokeinterface com.oracle.truffle.api.TruffleRuntime.createCallTarget:(Lcom/oracle/truffle/api/nodes/RootNode;)Lcom/oracle/truffle/api/RootCallTarget;
            areturn
        end local 2 // java.lang.String jsCode
        end local 1 // com.oracle.truffle.api.TruffleLanguage$ParsingRequest request
        end local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ProxyParsingLanguage;
            0    2     1  request  Lcom/oracle/truffle/api/TruffleLanguage$ParsingRequest;
            1    2     2   jsCode  Ljava/lang/String;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
         Name  Flags
      request  

  static java.lang.Object access$0(java.lang.Class);
    descriptor: (Ljava/lang/Class;)Ljava/lang/Object;
    flags: (0x1008) ACC_STATIC, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokestatic com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage.getCurrentContext:(Ljava/lang/Class;)Ljava/lang/Object;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
SourceFile: "InnerContextTest.java"
NestHost: com.oracle.truffle.js.test.polyglot.InnerContextTest
InnerClasses:
  public final ParsingRequest = com.oracle.truffle.api.TruffleLanguage$ParsingRequest of com.oracle.truffle.api.TruffleLanguage
  private ProxyParsingLanguage = com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage of com.oracle.truffle.js.test.polyglot.InnerContextTest
  ParseJsRootNode = com.oracle.truffle.js.test.polyglot.InnerContextTest$ProxyParsingLanguage$1ParseJsRootNode