https://www.graalvm.org/ 
class com.oracle.truffle.js.runtime.builtins.intl.JSLocale$9 extends com.oracle.truffle.js.runtime.JavaScriptRootNode
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.js.runtime.builtins.intl.JSLocale$9
  super_class: com.oracle.truffle.js.runtime.JavaScriptRootNode
{
  void <init>(com.oracle.truffle.js.lang.JavaScriptLanguage, com.oracle.truffle.api.source.SourceSection, com.oracle.truffle.api.frame.FrameDescriptor);
    descriptor: (Lcom/oracle/truffle/js/lang/JavaScriptLanguage;Lcom/oracle/truffle/api/source/SourceSection;Lcom/oracle/truffle/api/frame/FrameDescriptor;)V
    flags: (0x0000) 
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // com.oracle.truffle.js.runtime.builtins.intl.JSLocale$9 this
        start local 1 // com.oracle.truffle.js.lang.JavaScriptLanguage $anonymous0
        start local 2 // com.oracle.truffle.api.source.SourceSection $anonymous1
        start local 3 // com.oracle.truffle.api.frame.FrameDescriptor $anonymous2
         0: .line 283
            aload 0 /* this */
            aload 1 /* $anonymous0 */
            aload 2 /* $anonymous1 */
            aload 3 /* $anonymous2 */
            invokespecial com.oracle.truffle.js.runtime.JavaScriptRootNode.<init>:(Lcom/oracle/truffle/js/lang/JavaScriptLanguage;Lcom/oracle/truffle/api/source/SourceSection;Lcom/oracle/truffle/api/frame/FrameDescriptor;)V
            return
        end local 3 // com.oracle.truffle.api.frame.FrameDescriptor $anonymous2
        end local 2 // com.oracle.truffle.api.source.SourceSection $anonymous1
        end local 1 // com.oracle.truffle.js.lang.JavaScriptLanguage $anonymous0
        end local 0 // com.oracle.truffle.js.runtime.builtins.intl.JSLocale$9 this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    1     0         this  Lcom/oracle/truffle/js/runtime/builtins/intl/JSLocale$9;
            0    1     1  $anonymous0  Lcom/oracle/truffle/js/lang/JavaScriptLanguage;
            0    1     2  $anonymous1  Lcom/oracle/truffle/api/source/SourceSection;
            0    1     3  $anonymous2  Lcom/oracle/truffle/api/frame/FrameDescriptor;
    MethodParameters:
             Name  Flags
      $anonymous0  
      $anonymous1  
      $anonymous2  

  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=2, locals=3, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.builtins.intl.JSLocale$9 this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
         0: .line 286
            aload 1 /* frame */
            invokeinterface com.oracle.truffle.api.frame.VirtualFrame.getArguments:()[Ljava/lang/Object;
            iconst_0
            aaload
            astore 2 /* obj */
        start local 2 // java.lang.Object obj
         1: .line 287
            aload 2 /* obj */
            invokestatic com.oracle.truffle.js.runtime.builtins.intl.JSLocale.isJSLocale:(Ljava/lang/Object;)Z
            ifeq 3
         2: .line 288
            aload 2 /* obj */
            checkcast com.oracle.truffle.api.object.DynamicObject
            invokestatic com.oracle.truffle.js.runtime.builtins.intl.JSLocale.getInternalState:(Lcom/oracle/truffle/api/object/DynamicObject;)Lcom/oracle/truffle/js/runtime/builtins/intl/JSLocale$InternalState;
            invokevirtual com.oracle.truffle.js.runtime.builtins.intl.JSLocale$InternalState.getScript:()Ljava/lang/String;
            invokestatic com.oracle.truffle.js.runtime.builtins.intl.JSLocale.emptyStringToUndefined:(Ljava/lang/String;)Ljava/lang/Object;
            areturn
         3: .line 290
      StackMap locals: java.lang.Object
      StackMap stack:
            invokestatic com.oracle.truffle.js.runtime.Errors.createTypeErrorLocaleExpected:()Lcom/oracle/truffle/js/runtime/JSException;
            athrow
        end local 2 // java.lang.Object obj
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 0 // com.oracle.truffle.js.runtime.builtins.intl.JSLocale$9 this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lcom/oracle/truffle/js/runtime/builtins/intl/JSLocale$9;
            0    4     1  frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
            1    4     2    obj  Ljava/lang/Object;
    MethodParameters:
       Name  Flags
      frame  
}
SourceFile: "JSLocale.java"
EnclosingMethod: com.oracle.truffle.js.runtime.builtins.intl.JSLocale.lambda$8:(Lcom/oracle/truffle/js/runtime/JSContext;)Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;
NestHost: com.oracle.truffle.js.runtime.builtins.intl.JSLocale
InnerClasses:
  com.oracle.truffle.js.runtime.builtins.intl.JSLocale$9
  public InternalState = com.oracle.truffle.js.runtime.builtins.intl.JSLocale$InternalState of com.oracle.truffle.js.runtime.builtins.intl.JSLocale