https://www.graalvm.org/ 
abstract class com.oracle.truffle.js.builtins.JavaBuiltins$JavaIsScriptObjectNode extends com.oracle.truffle.js.nodes.function.JSBuiltinNode
  minor version: 0
  major version: 59
  flags: flags: (0x0420) ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.js.builtins.JavaBuiltins$JavaIsScriptObjectNode
  super_class: com.oracle.truffle.js.nodes.function.JSBuiltinNode
{
  void <init>(com.oracle.truffle.js.runtime.JSContext, com.oracle.truffle.js.nodes.function.JSBuiltin);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/nodes/function/JSBuiltin;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.builtins.JavaBuiltins$JavaIsScriptObjectNode this
        start local 1 // com.oracle.truffle.js.runtime.JSContext context
        start local 2 // com.oracle.truffle.js.nodes.function.JSBuiltin builtin
         0: .line 613
            aload 0 /* this */
            aload 1 /* context */
            aload 2 /* builtin */
            invokespecial com.oracle.truffle.js.nodes.function.JSBuiltinNode.<init>:(Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/nodes/function/JSBuiltin;)V
         1: .line 614
            return
        end local 2 // com.oracle.truffle.js.nodes.function.JSBuiltin builtin
        end local 1 // com.oracle.truffle.js.runtime.JSContext context
        end local 0 // com.oracle.truffle.js.builtins.JavaBuiltins$JavaIsScriptObjectNode this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lcom/oracle/truffle/js/builtins/JavaBuiltins$JavaIsScriptObjectNode;
            0    2     1  context  Lcom/oracle/truffle/js/runtime/JSContext;
            0    2     2  builtin  Lcom/oracle/truffle/js/nodes/function/JSBuiltin;
    MethodParameters:
         Name  Flags
      context  
      builtin  

  protected static boolean isScriptObject(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x000c) ACC_PROTECTED, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // java.lang.Object obj
         0: .line 618
            aload 0 /* obj */
            invokestatic com.oracle.truffle.js.runtime.objects.JSDynamicObject.isJSDynamicObject:(Ljava/lang/Object;)Z
            ireturn
        end local 0 // java.lang.Object obj
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0   obj  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization()
    MethodParameters:
      Name  Flags
      obj   
}
SourceFile: "JavaBuiltins.java"
NestHost: com.oracle.truffle.js.builtins.JavaBuiltins
InnerClasses:
  abstract JavaIsScriptObjectNode = com.oracle.truffle.js.builtins.JavaBuiltins$JavaIsScriptObjectNode of com.oracle.truffle.js.builtins.JavaBuiltins