https://www.graalvm.org/ 
public abstract class com.oracle.truffle.js.nodes.access.PrivateFieldAddNode extends com.oracle.truffle.js.nodes.JavaScriptBaseNode
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.js.nodes.access.PrivateFieldAddNode
  super_class: com.oracle.truffle.js.nodes.JavaScriptBaseNode
{
  protected final com.oracle.truffle.js.runtime.JSContext context;
    descriptor: Lcom/oracle/truffle/js/runtime/JSContext;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL

  public static com.oracle.truffle.js.nodes.access.PrivateFieldAddNode create(com.oracle.truffle.js.runtime.JSContext);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;)Lcom/oracle/truffle/js/nodes/access/PrivateFieldAddNode;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
         0: .line 65
            new java.lang.Error
            dup
            ldc "Unresolved compilation problem: \n\tPrivateFieldAddNodeGen cannot be resolved\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
         Name  Flags
      context  

  protected void <init>(com.oracle.truffle.js.runtime.JSContext);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.access.PrivateFieldAddNode this
        start local 1 // com.oracle.truffle.js.runtime.JSContext context
         0: .line 68
            aload 0 /* this */
            invokespecial com.oracle.truffle.js.nodes.JavaScriptBaseNode.<init>:()V
         1: .line 69
            aload 0 /* this */
            aload 1 /* context */
            putfield com.oracle.truffle.js.nodes.access.PrivateFieldAddNode.context:Lcom/oracle/truffle/js/runtime/JSContext;
         2: .line 70
            return
        end local 1 // com.oracle.truffle.js.runtime.JSContext context
        end local 0 // com.oracle.truffle.js.nodes.access.PrivateFieldAddNode this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lcom/oracle/truffle/js/nodes/access/PrivateFieldAddNode;
            0    3     1  context  Lcom/oracle/truffle/js/runtime/JSContext;
    MethodParameters:
         Name  Flags
      context  

  public abstract void execute(java.lang.Object, java.lang.Object, java.lang.Object);
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
        Name  Flags
      target  
      key     
      value   

  void doFieldAdd(com.oracle.truffle.api.object.DynamicObject, com.oracle.truffle.api.object.HiddenKey, java.lang.Object, com.oracle.truffle.api.object.DynamicObjectLibrary);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/api/object/HiddenKey;Ljava/lang/Object;Lcom/oracle/truffle/api/object/DynamicObjectLibrary;)V
    flags: (0x0000) 
    Code:
      stack=5, locals=5, args_size=5
        start local 0 // com.oracle.truffle.js.nodes.access.PrivateFieldAddNode this
        start local 1 // com.oracle.truffle.api.object.DynamicObject target
        start local 2 // com.oracle.truffle.api.object.HiddenKey key
        start local 3 // java.lang.Object value
        start local 4 // com.oracle.truffle.api.object.DynamicObjectLibrary access
         0: .line 84
            aload 4 /* access */
            aload 1 /* target */
            aload 2 /* key */
            invokevirtual com.oracle.truffle.api.object.DynamicObjectLibrary.containsKey:(Lcom/oracle/truffle/api/object/DynamicObject;Ljava/lang/Object;)Z
            ifne 3
         1: .line 85
            aload 4 /* access */
            aload 1 /* target */
            aload 2 /* key */
            aload 3 /* value */
            invokestatic com.oracle.truffle.js.runtime.objects.JSAttributes.getDefaultNotEnumerable:()I
            invokevirtual com.oracle.truffle.api.object.DynamicObjectLibrary.putWithFlags:(Lcom/oracle/truffle/api/object/DynamicObject;Ljava/lang/Object;Ljava/lang/Object;I)V
         2: .line 86
            goto 4
         3: .line 87
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 2 /* key */
            invokevirtual com.oracle.truffle.js.nodes.access.PrivateFieldAddNode.duplicate:(Lcom/oracle/truffle/api/object/HiddenKey;)Ljava/lang/Object;
            pop
         4: .line 89
      StackMap locals:
      StackMap stack:
            return
        end local 4 // com.oracle.truffle.api.object.DynamicObjectLibrary access
        end local 3 // java.lang.Object value
        end local 2 // com.oracle.truffle.api.object.HiddenKey key
        end local 1 // com.oracle.truffle.api.object.DynamicObject target
        end local 0 // com.oracle.truffle.js.nodes.access.PrivateFieldAddNode this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    5     0    this  Lcom/oracle/truffle/js/nodes/access/PrivateFieldAddNode;
            0    5     1  target  Lcom/oracle/truffle/api/object/DynamicObject;
            0    5     2     key  Lcom/oracle/truffle/api/object/HiddenKey;
            0    5     3   value  Ljava/lang/Object;
            0    5     4  access  Lcom/oracle/truffle/api/object/DynamicObjectLibrary;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(guards = {"isJSObject(target)"}, limit = "3")
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
      2:
      3:
        com.oracle.truffle.api.library.CachedLibrary(value = "target")
    MethodParameters:
        Name  Flags
      target  
      key     
      value   
      access  

  private java.lang.Object duplicate(com.oracle.truffle.api.object.HiddenKey);
    descriptor: (Lcom/oracle/truffle/api/object/HiddenKey;)Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.access.PrivateFieldAddNode this
        start local 1 // com.oracle.truffle.api.object.HiddenKey key
         0: .line 93
            aload 1 /* key */
            invokevirtual com.oracle.truffle.api.object.HiddenKey.getName:()Ljava/lang/String;
            aload 0 /* this */
            invokestatic com.oracle.truffle.js.runtime.Errors.createTypeErrorCannotAddPrivateMember:(Ljava/lang/String;Lcom/oracle/truffle/api/nodes/Node;)Lcom/oracle/truffle/js/runtime/JSException;
            athrow
        end local 1 // com.oracle.truffle.api.object.HiddenKey key
        end local 0 // com.oracle.truffle.js.nodes.access.PrivateFieldAddNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/nodes/access/PrivateFieldAddNode;
            0    1     1   key  Lcom/oracle/truffle/api/object/HiddenKey;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
      Name  Flags
      key   

  void doFallback(java.lang.Object, java.lang.Object, java.lang.Object);
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // com.oracle.truffle.js.nodes.access.PrivateFieldAddNode this
        start local 1 // java.lang.Object target
        start local 2 // java.lang.Object key
        start local 3 // java.lang.Object value
         0: .line 99
            aload 2 /* key */
            invokevirtual java.lang.Object.toString:()Ljava/lang/String;
            aload 1 /* target */
            aload 0 /* this */
            invokestatic com.oracle.truffle.js.runtime.Errors.createTypeErrorCannotSetProperty:(Ljava/lang/Object;Ljava/lang/Object;Lcom/oracle/truffle/api/nodes/Node;)Lcom/oracle/truffle/js/runtime/JSException;
            athrow
        end local 3 // java.lang.Object value
        end local 2 // java.lang.Object key
        end local 1 // java.lang.Object target
        end local 0 // com.oracle.truffle.js.nodes.access.PrivateFieldAddNode this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/js/nodes/access/PrivateFieldAddNode;
            0    1     1  target  Ljava/lang/Object;
            0    1     2     key  Ljava/lang/Object;
            0    1     3   value  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.dsl.Fallback()
    MethodParameters:
        Name  Flags
      target  
      key     
      value   
}
SourceFile: "PrivateFieldAddNode.java"
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives