https://www.graalvm.org/ 
public abstract class com.oracle.truffle.js.nodes.unary.IsNullNode extends com.oracle.truffle.js.nodes.unary.IsIdenticalBaseNode
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.js.nodes.unary.IsNullNode
  super_class: com.oracle.truffle.js.nodes.unary.IsIdenticalBaseNode
{
  static final boolean $assertionsDisabled;
    descriptor: Z
    flags: (0x1018) ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 56
            ldc Lcom/oracle/truffle/js/nodes/unary/IsNullNode;
            invokevirtual java.lang.Class.desiredAssertionStatus:()Z
            ifne 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic com.oracle.truffle.js.nodes.unary.IsNullNode.$assertionsDisabled:Z
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  protected void <init>(com.oracle.truffle.js.nodes.JavaScriptNode, boolean);
    descriptor: (Lcom/oracle/truffle/js/nodes/JavaScriptNode;Z)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.nodes.unary.IsNullNode this
        start local 1 // com.oracle.truffle.js.nodes.JavaScriptNode operand
        start local 2 // boolean leftConstant
         0: .line 59
            aload 0 /* this */
            aload 1 /* operand */
            iload 2 /* leftConstant */
            invokespecial com.oracle.truffle.js.nodes.unary.IsIdenticalBaseNode.<init>:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;Z)V
         1: .line 60
            return
        end local 2 // boolean leftConstant
        end local 1 // com.oracle.truffle.js.nodes.JavaScriptNode operand
        end local 0 // com.oracle.truffle.js.nodes.unary.IsNullNode this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    2     0          this  Lcom/oracle/truffle/js/nodes/unary/IsNullNode;
            0    2     1       operand  Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            0    2     2  leftConstant  Z
    MethodParameters:
              Name  Flags
      operand       
      leftConstant  

  protected static boolean doNull(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 operand
         0: .line 64
            iconst_1
            ireturn
        end local 0 // java.lang.Object operand
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0  operand  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(guards = {"isJSNull(operand)"})
    MethodParameters:
         Name  Flags
      operand  

  protected static boolean doUndefined(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 operand
         0: .line 69
            iconst_0
            ireturn
        end local 0 // java.lang.Object operand
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0  operand  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(guards = {"isUndefined(operand)"})
    MethodParameters:
         Name  Flags
      operand  

  protected static boolean doObject(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 operand
         0: .line 74
            iconst_0
            ireturn
        end local 0 // java.lang.Object operand
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0  operand  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(guards = {"isJSObject(operand)"})
    MethodParameters:
         Name  Flags
      operand  

  protected static boolean doCached(java.lang.Object, com.oracle.truffle.api.interop.InteropLibrary);
    descriptor: (Ljava/lang/Object;Lcom/oracle/truffle/api/interop/InteropLibrary;)Z
    flags: (0x000c) ACC_PROTECTED, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // java.lang.Object operand
        start local 1 // com.oracle.truffle.api.interop.InteropLibrary interop
         0: .line 80
            getstatic com.oracle.truffle.js.nodes.unary.IsNullNode.$assertionsDisabled:Z
            ifne 1
            aload 0 /* operand */
            getstatic com.oracle.truffle.js.runtime.objects.Undefined.instance:Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;
            if_acmpne 1
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         1: .line 81
      StackMap locals:
      StackMap stack:
            aload 1 /* interop */
            aload 0 /* operand */
            invokevirtual com.oracle.truffle.api.interop.InteropLibrary.isNull:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // com.oracle.truffle.api.interop.InteropLibrary interop
        end local 0 // java.lang.Object operand
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0  operand  Ljava/lang/Object;
            0    2     1  interop  Lcom/oracle/truffle/api/interop/InteropLibrary;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(guards = {"!isJSDynamicObject(operand)"}, limit = "InteropLibraryLimit")
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
        com.oracle.truffle.api.library.CachedLibrary(value = "operand")
    MethodParameters:
         Name  Flags
      operand  
      interop  

  public static com.oracle.truffle.js.nodes.unary.IsNullNode create(com.oracle.truffle.js.nodes.JavaScriptNode, boolean);
    descriptor: (Lcom/oracle/truffle/js/nodes/JavaScriptNode;Z)Lcom/oracle/truffle/js/nodes/unary/IsNullNode;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=2
         0: .line 85
            new java.lang.Error
            dup
            ldc "Unresolved compilation problem: \n\tIsNullNodeGen cannot be resolved\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
              Name  Flags
      operand       
      leftConstant  

  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=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.unary.IsNullNode this
        start local 1 // java.util.Set materializedTags
         0: .line 90
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.nodes.unary.IsNullNode.getOperand:()Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            aload 1 /* materializedTags */
            invokestatic com.oracle.truffle.js.nodes.unary.IsNullNode.cloneUninitialized:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;Ljava/util/Set;)Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.unary.IsNullNode.leftConstant:Z
            invokestatic com.oracle.truffle.js.nodes.unary.IsNullNode.create:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;Z)Lcom/oracle/truffle/js/nodes/unary/IsNullNode;
            areturn
        end local 1 // java.util.Set materializedTags
        end local 0 // com.oracle.truffle.js.nodes.unary.IsNullNode this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    1     0              this  Lcom/oracle/truffle/js/nodes/unary/IsNullNode;
            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  

  protected java.lang.Object getConstantValue();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.nodes.unary.IsNullNode this
         0: .line 95
            getstatic com.oracle.truffle.js.runtime.objects.Null.instance:Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;
            areturn
        end local 0 // com.oracle.truffle.js.nodes.unary.IsNullNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/nodes/unary/IsNullNode;
}
SourceFile: "IsNullNode.java"
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.dsl.ImportStatic(value = {Lcom/oracle/truffle/js/runtime/JSConfig;})