https://www.graalvm.org/ 
public class com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage extends com.oracle.truffle.api.TruffleLanguage<com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage
  super_class: com.oracle.truffle.api.TruffleLanguage
{
  static final java.lang.String ID;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "ContextAPITestLanguage"

  static final java.lang.String MIME;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "text/x-ContextAPITestLanguage"

  static java.util.function.Function<com.oracle.truffle.api.TruffleLanguage$Env, java.lang.Object> runinside;
    descriptor: Ljava/util/function/Function;
    flags: (0x0008) ACC_STATIC
    Signature: Ljava/util/function/Function<Lcom/oracle/truffle/api/TruffleLanguage$Env;Ljava/lang/Object;>;

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage this
         0: .line 54
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.TruffleLanguage.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage;

  public static com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext getContext();
    descriptor: ()Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 69
            ldc Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage;
            invokestatic com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage.getCurrentContext:(Ljava/lang/Class;)Ljava/lang/Object;
            checkcast com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  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=4, args_size=2
        start local 0 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$ParsingRequest request
         0: .line 74
            ldc "null result"
            astore 2 /* result */
        start local 2 // java.lang.Object result
         1: .line 75
            getstatic com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage.runinside:Ljava/util/function/Function;
            ifnull 8
         2: .line 77
            getstatic com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage.runinside:Ljava/util/function/Function;
            invokestatic com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage.getContext:()Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;
            getfield com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext.env:Lcom/oracle/truffle/api/TruffleLanguage$Env;
            invokeinterface java.util.function.Function.apply:(Ljava/lang/Object;)Ljava/lang/Object;
            astore 2 /* result */
         3: .line 78
            goto 7
      StackMap locals: com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage com.oracle.truffle.api.TruffleLanguage$ParsingRequest java.lang.Object
      StackMap stack: java.lang.Throwable
         4: astore 3
         5: .line 79
            aconst_null
            putstatic com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage.runinside:Ljava/util/function/Function;
         6: .line 80
            aload 3
            athrow
         7: .line 79
      StackMap locals:
      StackMap stack:
            aconst_null
            putstatic com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage.runinside:Ljava/util/function/Function;
         8: .line 82
      StackMap locals:
      StackMap stack:
            aload 2 /* result */
            ifnonnull 10
         9: .line 83
            ldc "null result"
            astore 2 /* result */
        10: .line 85
      StackMap locals:
      StackMap stack:
            aload 2 /* result */
            astore 3 /* finalResult */
        start local 3 // java.lang.Object finalResult
        11: .line 86
            invokestatic com.oracle.truffle.api.Truffle.getRuntime:()Lcom/oracle/truffle/api/TruffleRuntime;
            new com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$1
            dup
            aload 0 /* this */
            aload 0 /* this */
            aload 3 /* finalResult */
            invokespecial com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$1.<init>:(Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage;Lcom/oracle/truffle/api/TruffleLanguage;Ljava/lang/Object;)V
            invokeinterface com.oracle.truffle.api.TruffleRuntime.createCallTarget:(Lcom/oracle/truffle/api/nodes/RootNode;)Lcom/oracle/truffle/api/RootCallTarget;
            areturn
        end local 3 // java.lang.Object finalResult
        end local 2 // java.lang.Object result
        end local 1 // com.oracle.truffle.api.TruffleLanguage$ParsingRequest request
        end local 0 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0   12     0         this  Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage;
            0   12     1      request  Lcom/oracle/truffle/api/TruffleLanguage$ParsingRequest;
            1   12     2       result  Ljava/lang/Object;
           11   12     3  finalResult  Ljava/lang/Object;
      Exception table:
        from    to  target  type
           2     4       4  any
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
         Name  Flags
      request  

  protected com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext createContext(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
         0: .line 96
            new com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext
            dup
            invokespecial com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext.<init>:()V
            putstatic com.oracle.truffle.api.test.polyglot.ContextAPITest.langContext:Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;
         1: .line 97
            getstatic com.oracle.truffle.api.test.polyglot.ContextAPITest.langContext:Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;
            aload 1 /* env */
            putfield com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext.env:Lcom/oracle/truffle/api/TruffleLanguage$Env;
         2: .line 98
            getstatic com.oracle.truffle.api.test.polyglot.ContextAPITest.langContext:Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;
            areturn
        end local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
        end local 0 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage;
            0    3     1   env  Lcom/oracle/truffle/api/TruffleLanguage$Env;
    MethodParameters:
      Name  Flags
      env   

  protected void disposeContext(com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext);
    descriptor: (Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage this
        start local 1 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext context
         0: .line 103
            aload 1 /* context */
            dup
            getfield com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext.disposeCalled:I
            iconst_1
            iadd
            putfield com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext.disposeCalled:I
         1: .line 104
            return
        end local 1 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext context
        end local 0 // com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage;
            0    2     1  context  Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;
    MethodParameters:
         Name  Flags
      context  

  protected java.lang.Object createContext(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)Ljava/lang/Object;
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            invokevirtual com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage.createContext:(Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  protected void disposeContext(java.lang.Object);
    descriptor: (Ljava/lang/Object;)V
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext
            invokevirtual com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage.disposeContext:(Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Lcom/oracle/truffle/api/TruffleLanguage<Lcom/oracle/truffle/api/test/polyglot/ContextAPITestLanguage$LanguageContext;>;
SourceFile: "ContextAPITestLanguage.java"
NestMembers:
  com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$1  com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext
InnerClasses:
  public final Env = com.oracle.truffle.api.TruffleLanguage$Env of com.oracle.truffle.api.TruffleLanguage
  public final ParsingRequest = com.oracle.truffle.api.TruffleLanguage$ParsingRequest of com.oracle.truffle.api.TruffleLanguage
  public abstract Registration = com.oracle.truffle.api.TruffleLanguage$Registration of com.oracle.truffle.api.TruffleLanguage
  com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$1
  LanguageContext = com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage$LanguageContext of com.oracle.truffle.api.test.polyglot.ContextAPITestLanguage
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.TruffleLanguage$Registration(id = "ContextAPITestLanguage", name = "ContextAPITestLanguage", version = "1.0", characterMimeTypes = {"text/x-ContextAPITestLanguage"})