https://www.graalvm.org/ 
public final class com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView implements com.oracle.truffle.api.interop.TruffleObject
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView
  super_class: java.lang.Object
{
  protected final java.lang.Object delegate;
    descriptor: Ljava/lang/Object;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL

  private void <init>(java.lang.Object);
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
        start local 1 // java.lang.Object delegate
         0: .line 62
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 63
            aload 0 /* this */
            aload 1 /* delegate */
            putfield com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView.delegate:Ljava/lang/Object;
         2: .line 64
            return
        end local 1 // java.lang.Object delegate
        end local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    3     0      this  Lcom/oracle/truffle/js/runtime/interop/JavaScriptLanguageView;
            0    3     1  delegate  Ljava/lang/Object;
    MethodParameters:
          Name  Flags
      delegate  

  public static com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView create(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Lcom/oracle/truffle/js/runtime/interop/JavaScriptLanguageView;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.lang.Object delegate
         0: .line 67
            new com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView
            dup
            aload 0 /* delegate */
            invokespecial com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView.<init>:(Ljava/lang/Object;)V
            areturn
        end local 0 // java.lang.Object delegate
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0  delegate  Ljava/lang/Object;
    MethodParameters:
          Name  Flags
      delegate  

  boolean hasLanguage();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
         0: .line 73
            iconst_1
            ireturn
        end local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/interop/JavaScriptLanguageView;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  java.lang.Class<? extends com.oracle.truffle.api.TruffleLanguage<?>> getLanguage();
    descriptor: ()Ljava/lang/Class;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
         0: .line 79
            ldc Lcom/oracle/truffle/js/lang/JavaScriptLanguage;
            areturn
        end local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/interop/JavaScriptLanguageView;
    Signature: ()Ljava/lang/Class<+Lcom/oracle/truffle/api/TruffleLanguage<*>;>;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  java.lang.Object toDisplayString(boolean);
    descriptor: (Z)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
        start local 1 // boolean allowSideEffects
         0: .line 84
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView.delegate:Ljava/lang/Object;
            iload 1 /* allowSideEffects */
            invokestatic com.oracle.truffle.js.runtime.JSRuntime.toDisplayString:(Ljava/lang/Object;Z)Ljava/lang/String;
            areturn
        end local 1 // boolean allowSideEffects
        end local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    1     0              this  Lcom/oracle/truffle/js/runtime/interop/JavaScriptLanguageView;
            0    1     1  allowSideEffects  Z
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
                  Name  Flags
      allowSideEffects  

  boolean hasMetaObject(com.oracle.truffle.api.interop.InteropLibrary);
    descriptor: (Lcom/oracle/truffle/api/interop/InteropLibrary;)Z
    flags: (0x0000) 
    Code:
      stack=3, locals=6, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
        start local 1 // com.oracle.truffle.api.interop.InteropLibrary delegateLibrary
         0: .line 90
            getstatic com.oracle.truffle.js.runtime.interop.JSMetaType.KNOWN_TYPES:[Lcom/oracle/truffle/js/runtime/interop/JSMetaType;
            dup
            astore 5
            arraylength
            istore 4
            iconst_0
            istore 3
            goto 5
      StackMap locals: com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView com.oracle.truffle.api.interop.InteropLibrary top int int com.oracle.truffle.js.runtime.interop.JSMetaType[]
      StackMap stack:
         1: aload 5
            iload 3
            aaload
            astore 2 /* type */
        start local 2 // com.oracle.truffle.js.runtime.interop.JSMetaType type
         2: .line 91
            aload 2 /* type */
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView.delegate:Ljava/lang/Object;
            aload 1 /* delegateLibrary */
            invokevirtual com.oracle.truffle.js.runtime.interop.JSMetaType.isInstance:(Ljava/lang/Object;Lcom/oracle/truffle/api/interop/InteropLibrary;)Z
            ifeq 4
         3: .line 92
            iconst_1
            ireturn
        end local 2 // com.oracle.truffle.js.runtime.interop.JSMetaType type
         4: .line 90
      StackMap locals:
      StackMap stack:
            iinc 3 1
      StackMap locals:
      StackMap stack:
         5: iload 3
            iload 4
            if_icmplt 1
         6: .line 95
            iconst_0
            ireturn
        end local 1 // com.oracle.truffle.api.interop.InteropLibrary delegateLibrary
        end local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    7     0             this  Lcom/oracle/truffle/js/runtime/interop/JavaScriptLanguageView;
            0    7     1  delegateLibrary  Lcom/oracle/truffle/api/interop/InteropLibrary;
            2    4     2             type  Lcom/oracle/truffle/js/runtime/interop/JSMetaType;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.nodes.ExplodeLoop()
    RuntimeInvisibleParameterAnnotations: 
      0:
        com.oracle.truffle.api.library.CachedLibrary(value = "this.delegate")
    MethodParameters:
                 Name  Flags
      delegateLibrary  

  java.lang.Object getMetaObject(com.oracle.truffle.api.interop.InteropLibrary);
    descriptor: (Lcom/oracle/truffle/api/interop/InteropLibrary;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=3, locals=6, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
        start local 1 // com.oracle.truffle.api.interop.InteropLibrary delegateLibrary
         0: .line 101
            getstatic com.oracle.truffle.js.runtime.interop.JSMetaType.KNOWN_TYPES:[Lcom/oracle/truffle/js/runtime/interop/JSMetaType;
            dup
            astore 5
            arraylength
            istore 4
            iconst_0
            istore 3
            goto 5
      StackMap locals: com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView com.oracle.truffle.api.interop.InteropLibrary top int int com.oracle.truffle.js.runtime.interop.JSMetaType[]
      StackMap stack:
         1: aload 5
            iload 3
            aaload
            astore 2 /* type */
        start local 2 // com.oracle.truffle.js.runtime.interop.JSMetaType type
         2: .line 102
            aload 2 /* type */
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView.delegate:Ljava/lang/Object;
            aload 1 /* delegateLibrary */
            invokevirtual com.oracle.truffle.js.runtime.interop.JSMetaType.isInstance:(Ljava/lang/Object;Lcom/oracle/truffle/api/interop/InteropLibrary;)Z
            ifeq 4
         3: .line 103
            aload 2 /* type */
            areturn
        end local 2 // com.oracle.truffle.js.runtime.interop.JSMetaType type
         4: .line 101
      StackMap locals:
      StackMap stack:
            iinc 3 1
      StackMap locals:
      StackMap stack:
         5: iload 3
            iload 4
            if_icmplt 1
         6: .line 106
            invokestatic com.oracle.truffle.api.interop.UnsupportedMessageException.create:()Lcom/oracle/truffle/api/interop/UnsupportedMessageException;
            athrow
        end local 1 // com.oracle.truffle.api.interop.InteropLibrary delegateLibrary
        end local 0 // com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    7     0             this  Lcom/oracle/truffle/js/runtime/interop/JavaScriptLanguageView;
            0    7     1  delegateLibrary  Lcom/oracle/truffle/api/interop/InteropLibrary;
            2    4     2             type  Lcom/oracle/truffle/js/runtime/interop/JSMetaType;
    Exceptions:
      throws com.oracle.truffle.api.interop.UnsupportedMessageException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.nodes.ExplodeLoop()
    RuntimeInvisibleParameterAnnotations: 
      0:
        com.oracle.truffle.api.library.CachedLibrary(value = "this.delegate")
    MethodParameters:
                 Name  Flags
      delegateLibrary  
}
SourceFile: "JavaScriptLanguageView.java"
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportLibrary(value = Lcom/oracle/truffle/api/interop/InteropLibrary;, delegateTo = "delegate")