https://www.graalvm.org/ 
public abstract class com.oracle.truffle.js.nodes.access.IsJSClassNode extends com.oracle.truffle.js.nodes.unary.JSUnaryNode
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.js.nodes.access.IsJSClassNode
  super_class: com.oracle.truffle.js.nodes.unary.JSUnaryNode
{
  protected static final int MAX_SHAPE_COUNT;
    descriptor: I
    flags: (0x001c) ACC_PROTECTED, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  private final com.oracle.truffle.js.runtime.builtins.JSClass jsclass;
    descriptor: Lcom/oracle/truffle/js/runtime/builtins/JSClass;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  protected void <init>(com.oracle.truffle.js.runtime.builtins.JSClass, com.oracle.truffle.js.nodes.JavaScriptNode);
    descriptor: (Lcom/oracle/truffle/js/runtime/builtins/JSClass;Lcom/oracle/truffle/js/nodes/JavaScriptNode;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
        start local 1 // com.oracle.truffle.js.runtime.builtins.JSClass jsclass
        start local 2 // com.oracle.truffle.js.nodes.JavaScriptNode operand
         0: .line 61
            aload 0 /* this */
            aload 2 /* operand */
            invokespecial com.oracle.truffle.js.nodes.unary.JSUnaryNode.<init>:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;)V
         1: .line 62
            aload 0 /* this */
            aload 1 /* jsclass */
            putfield com.oracle.truffle.js.nodes.access.IsJSClassNode.jsclass:Lcom/oracle/truffle/js/runtime/builtins/JSClass;
         2: .line 63
            return
        end local 2 // com.oracle.truffle.js.nodes.JavaScriptNode operand
        end local 1 // com.oracle.truffle.js.runtime.builtins.JSClass jsclass
        end local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lcom/oracle/truffle/js/nodes/access/IsJSClassNode;
            0    3     1  jsclass  Lcom/oracle/truffle/js/runtime/builtins/JSClass;
            0    3     2  operand  Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    MethodParameters:
         Name  Flags
      jsclass  
      operand  

  public abstract boolean executeBoolean(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      obj   

  protected static boolean doIsInstanceShape(com.oracle.truffle.api.object.DynamicObject, com.oracle.truffle.api.object.Shape, boolean);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/api/object/Shape;Z)Z
    flags: (0x000c) ACC_PROTECTED, ACC_STATIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.api.object.DynamicObject object
        start local 1 // com.oracle.truffle.api.object.Shape cachedShape
        start local 2 // boolean cachedResult
         0: .line 72
            iload 2 /* cachedResult */
            ifeq 1
            aload 1 /* cachedShape */
            aload 0 /* object */
            invokevirtual com.oracle.truffle.api.object.Shape.check:(Lcom/oracle/truffle/api/object/DynamicObject;)Z
            ifeq 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 2 // boolean cachedResult
        end local 1 // com.oracle.truffle.api.object.Shape cachedShape
        end local 0 // com.oracle.truffle.api.object.DynamicObject object
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    2     0        object  Lcom/oracle/truffle/api/object/DynamicObject;
            0    2     1   cachedShape  Lcom/oracle/truffle/api/object/Shape;
            0    2     2  cachedResult  Z
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(guards = {"cachedShape.check(object)"}, limit = "MAX_SHAPE_COUNT")
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
        com.oracle.truffle.api.dsl.Cached(value = "object.getShape()")
      2:
        com.oracle.truffle.api.dsl.Cached(value = "doIsInstance(object)")
    MethodParameters:
              Name  Flags
      object        
      cachedShape   
      cachedResult  

  protected boolean doIsInstanceObject(com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;)Z
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
        start local 1 // com.oracle.truffle.api.object.DynamicObject object
         0: .line 77
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.access.IsJSClassNode.jsclass:Lcom/oracle/truffle/js/runtime/builtins/JSClass;
            aload 1 /* object */
            invokevirtual com.oracle.truffle.js.runtime.builtins.JSClass.isInstance:(Lcom/oracle/truffle/api/object/DynamicObject;)Z
            ireturn
        end local 1 // com.oracle.truffle.api.object.DynamicObject object
        end local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/js/nodes/access/IsJSClassNode;
            0    1     1  object  Lcom/oracle/truffle/api/object/DynamicObject;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(replaces = {"doIsInstanceShape"})
    MethodParameters:
        Name  Flags
      object  

  protected boolean doIsInstance(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
        start local 1 // java.lang.Object object
         0: .line 82
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.access.IsJSClassNode.jsclass:Lcom/oracle/truffle/js/runtime/builtins/JSClass;
            aload 1 /* object */
            invokevirtual com.oracle.truffle.js.runtime.builtins.JSClass.isInstance:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.Object object
        end local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/js/nodes/access/IsJSClassNode;
            0    1     1  object  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(replaces = {"doIsInstanceObject"})
    MethodParameters:
        Name  Flags
      object  

  public static com.oracle.truffle.js.nodes.access.IsJSClassNode create(com.oracle.truffle.js.runtime.builtins.JSClass);
    descriptor: (Lcom/oracle/truffle/js/runtime/builtins/JSClass;)Lcom/oracle/truffle/js/nodes/access/IsJSClassNode;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSClass clazz
         0: .line 86
            aload 0 /* clazz */
            aconst_null
            invokestatic com.oracle.truffle.js.nodes.access.IsJSClassNode.create:(Lcom/oracle/truffle/js/runtime/builtins/JSClass;Lcom/oracle/truffle/js/nodes/JavaScriptNode;)Lcom/oracle/truffle/js/nodes/access/IsJSClassNode;
            areturn
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSClass clazz
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0  clazz  Lcom/oracle/truffle/js/runtime/builtins/JSClass;
    MethodParameters:
       Name  Flags
      clazz  

  public static com.oracle.truffle.js.nodes.access.IsJSClassNode create(com.oracle.truffle.js.runtime.builtins.JSClass, com.oracle.truffle.js.nodes.JavaScriptNode);
    descriptor: (Lcom/oracle/truffle/js/runtime/builtins/JSClass;Lcom/oracle/truffle/js/nodes/JavaScriptNode;)Lcom/oracle/truffle/js/nodes/access/IsJSClassNode;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=2
         0: .line 90
            new java.lang.Error
            dup
            ldc "Unresolved compilation problem: \n\tIsJSClassNodeGen cannot be resolved\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
         Name  Flags
      clazz    
      operand  

  protected com.oracle.truffle.js.nodes.JavaScriptNode copyUninitialized(java.util.Set<java.lang.Class<? extends com.oracle.truffle.api.instrumentation.Tag>>);
    descriptor: (Ljava/util/Set;)Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
        start local 1 // java.util.Set materializedTags
         0: .line 95
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.access.IsJSClassNode.jsclass:Lcom/oracle/truffle/js/runtime/builtins/JSClass;
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.nodes.access.IsJSClassNode.getOperand:()Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            aload 1 /* materializedTags */
            invokestatic com.oracle.truffle.js.nodes.access.IsJSClassNode.cloneUninitialized:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;Ljava/util/Set;)Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            invokestatic com.oracle.truffle.js.nodes.access.IsJSClassNode.create:(Lcom/oracle/truffle/js/runtime/builtins/JSClass;Lcom/oracle/truffle/js/nodes/JavaScriptNode;)Lcom/oracle/truffle/js/nodes/access/IsJSClassNode;
            areturn
        end local 1 // java.util.Set materializedTags
        end local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    1     0              this  Lcom/oracle/truffle/js/nodes/access/IsJSClassNode;
            0    1     1  materializedTags  Ljava/util/Set<Ljava/lang/Class<+Lcom/oracle/truffle/api/instrumentation/Tag;>;>;
    Signature: (Ljava/util/Set<Ljava/lang/Class<+Lcom/oracle/truffle/api/instrumentation/Tag;>;>;)Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    MethodParameters:
                  Name  Flags
      materializedTags  

  public boolean isResultAlwaysOfType(java.lang.Class<?>);
    descriptor: (Ljava/lang/Class;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
        start local 1 // java.lang.Class clazz
         0: .line 100
            aload 1 /* clazz */
            getstatic java.lang.Boolean.TYPE:Ljava/lang/Class;
            if_acmpne 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 1 // java.lang.Class clazz
        end local 0 // com.oracle.truffle.js.nodes.access.IsJSClassNode this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Lcom/oracle/truffle/js/nodes/access/IsJSClassNode;
            0    2     1  clazz  Ljava/lang/Class<*>;
    Signature: (Ljava/lang/Class<*>;)Z
    MethodParameters:
       Name  Flags
      clazz  
}
SourceFile: "IsJSClassNode.java"