https://www.graalvm.org/ 
public final class com.oracle.truffle.js.runtime.builtins.JSWeakSet extends com.oracle.truffle.js.runtime.builtins.JSNonProxy implements com.oracle.truffle.js.runtime.builtins.JSConstructorFactory$Default, com.oracle.truffle.js.runtime.builtins.PrototypeSupplier
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.js.runtime.builtins.JSWeakSet
  super_class: com.oracle.truffle.js.runtime.builtins.JSNonProxy
{
  public static final com.oracle.truffle.js.runtime.builtins.JSWeakSet INSTANCE;
    descriptor: Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  public static final java.lang.String CLASS_NAME;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "WeakSet"

  public static final java.lang.String PROTOTYPE_NAME;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "WeakSet.prototype"

  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=2, locals=0, args_size=0
         0: .line 54
            ldc Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
            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.runtime.builtins.JSWeakSet.$assertionsDisabled:Z
         3: .line 56
            new com.oracle.truffle.js.runtime.builtins.JSWeakSet
            dup
            invokespecial com.oracle.truffle.js.runtime.builtins.JSWeakSet.<init>:()V
            putstatic com.oracle.truffle.js.runtime.builtins.JSWeakSet.INSTANCE:Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
         4: .line 59
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
         0: .line 61
            aload 0 /* this */
            invokespecial com.oracle.truffle.js.runtime.builtins.JSNonProxy.<init>:()V
         1: .line 62
            return
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;

  public static com.oracle.truffle.api.object.DynamicObject create(com.oracle.truffle.js.runtime.JSContext);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;)Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=4, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.JSContext context
         0: .line 65
            aload 0 /* context */
            invokevirtual com.oracle.truffle.js.runtime.JSContext.getRealm:()Lcom/oracle/truffle/js/runtime/JSRealm;
            astore 1 /* realm */
        start local 1 // com.oracle.truffle.js.runtime.JSRealm realm
         1: .line 66
            aload 0 /* context */
            invokevirtual com.oracle.truffle.js.runtime.JSContext.getWeakSetFactory:()Lcom/oracle/truffle/js/runtime/builtins/JSObjectFactory;
            astore 2 /* factory */
        start local 2 // com.oracle.truffle.js.runtime.builtins.JSObjectFactory factory
         2: .line 67
            aload 2 /* factory */
            new com.oracle.truffle.js.runtime.builtins.JSWeakSetObject
            dup
            aload 2 /* factory */
            aload 1 /* realm */
            invokevirtual com.oracle.truffle.js.runtime.builtins.JSObjectFactory.getShape:(Lcom/oracle/truffle/js/runtime/JSRealm;)Lcom/oracle/truffle/api/object/Shape;
            invokestatic com.oracle.truffle.js.runtime.builtins.JSWeakSet.newWeakHashMap:()Ljava/util/Map;
            invokespecial com.oracle.truffle.js.runtime.builtins.JSWeakSetObject.<init>:(Lcom/oracle/truffle/api/object/Shape;Ljava/util/Map;)V
            aload 1 /* realm */
            invokevirtual com.oracle.truffle.js.runtime.builtins.JSObjectFactory.initProto:(Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/js/runtime/JSRealm;)Lcom/oracle/truffle/api/object/DynamicObject;
            astore 3 /* obj */
        start local 3 // com.oracle.truffle.api.object.DynamicObject obj
         3: .line 68
            getstatic com.oracle.truffle.js.runtime.builtins.JSWeakSet.$assertionsDisabled:Z
            ifne 4
            aload 3 /* obj */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSWeakSet.isJSWeakSet:(Ljava/lang/Object;)Z
            ifne 4
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         4: .line 69
      StackMap locals: com.oracle.truffle.js.runtime.JSRealm com.oracle.truffle.js.runtime.builtins.JSObjectFactory com.oracle.truffle.api.object.DynamicObject
      StackMap stack:
            aload 0 /* context */
            aload 3 /* obj */
            invokevirtual com.oracle.truffle.js.runtime.JSContext.trackAllocation:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast com.oracle.truffle.api.object.DynamicObject
            areturn
        end local 3 // com.oracle.truffle.api.object.DynamicObject obj
        end local 2 // com.oracle.truffle.js.runtime.builtins.JSObjectFactory factory
        end local 1 // com.oracle.truffle.js.runtime.JSRealm realm
        end local 0 // com.oracle.truffle.js.runtime.JSContext context
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    5     0  context  Lcom/oracle/truffle/js/runtime/JSContext;
            1    5     1    realm  Lcom/oracle/truffle/js/runtime/JSRealm;
            2    5     2  factory  Lcom/oracle/truffle/js/runtime/builtins/JSObjectFactory;
            3    5     3      obj  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
         Name  Flags
      context  

  private static java.util.Map<java.lang.Object, java.lang.Object> newWeakHashMap();
    descriptor: ()Ljava/util/Map;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 74
            new java.util.WeakHashMap
            dup
            invokespecial java.util.WeakHashMap.<init>:()V
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: ()Ljava/util/Map<Ljava/lang/Object;Ljava/lang/Object;>;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()

  public static java.util.Map<java.lang.Object, java.lang.Object> getInternalWeakMap(com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;)Ljava/util/Map;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.object.DynamicObject obj
         0: .line 79
            getstatic com.oracle.truffle.js.runtime.builtins.JSWeakSet.$assertionsDisabled:Z
            ifne 1
            aload 0 /* obj */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSWeakSet.isJSWeakSet:(Ljava/lang/Object;)Z
            ifne 1
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         1: .line 81
      StackMap locals:
      StackMap stack:
            aload 0 /* obj */
            checkcast com.oracle.truffle.js.runtime.builtins.JSWeakSetObject
            invokevirtual com.oracle.truffle.js.runtime.builtins.JSWeakSetObject.getWeakHashMap:()Ljava/util/Map;
            areturn
        end local 0 // com.oracle.truffle.api.object.DynamicObject obj
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0   obj  Lcom/oracle/truffle/api/object/DynamicObject;
    Signature: (Lcom/oracle/truffle/api/object/DynamicObject;)Ljava/util/Map<Ljava/lang/Object;Ljava/lang/Object;>;
    MethodParameters:
      Name  Flags
      obj   

  public com.oracle.truffle.api.object.DynamicObject createPrototype(com.oracle.truffle.js.runtime.JSRealm, com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSRealm;Lcom/oracle/truffle/api/object/DynamicObject;)Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=3
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
        start local 1 // com.oracle.truffle.js.runtime.JSRealm realm
        start local 2 // com.oracle.truffle.api.object.DynamicObject ctor
         0: .line 86
            aload 1 /* realm */
            invokevirtual com.oracle.truffle.js.runtime.JSRealm.getContext:()Lcom/oracle/truffle/js/runtime/JSContext;
            astore 3 /* ctx */
        start local 3 // com.oracle.truffle.js.runtime.JSContext ctx
         1: .line 87
            aload 1 /* realm */
            invokestatic com.oracle.truffle.js.runtime.objects.JSObjectUtil.createOrdinaryPrototypeObject:(Lcom/oracle/truffle/js/runtime/JSRealm;)Lcom/oracle/truffle/api/object/DynamicObject;
            astore 4 /* prototype */
        start local 4 // com.oracle.truffle.api.object.DynamicObject prototype
         2: .line 88
            aload 3 /* ctx */
            aload 4 /* prototype */
            aload 2 /* ctor */
            invokestatic com.oracle.truffle.js.runtime.objects.JSObjectUtil.putConstructorProperty:(Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/api/object/DynamicObject;)V
         3: .line 89
            aload 1 /* realm */
            aload 4 /* prototype */
            getstatic com.oracle.truffle.js.builtins.WeakSetPrototypeBuiltins.BUILTINS:Lcom/oracle/truffle/js/builtins/JSBuiltinsContainer;
            invokestatic com.oracle.truffle.js.runtime.objects.JSObjectUtil.putFunctionsFromContainer:(Lcom/oracle/truffle/js/runtime/JSRealm;Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/js/builtins/JSBuiltinsContainer;)V
         4: .line 90
            aload 4 /* prototype */
            ldc "WeakSet"
            invokestatic com.oracle.truffle.js.runtime.objects.JSObjectUtil.putToStringTag:(Lcom/oracle/truffle/api/object/DynamicObject;Ljava/lang/String;)V
         5: .line 91
            aload 4 /* prototype */
            areturn
        end local 4 // com.oracle.truffle.api.object.DynamicObject prototype
        end local 3 // com.oracle.truffle.js.runtime.JSContext ctx
        end local 2 // com.oracle.truffle.api.object.DynamicObject ctor
        end local 1 // com.oracle.truffle.js.runtime.JSRealm realm
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    6     0       this  Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
            0    6     1      realm  Lcom/oracle/truffle/js/runtime/JSRealm;
            0    6     2       ctor  Lcom/oracle/truffle/api/object/DynamicObject;
            1    6     3        ctx  Lcom/oracle/truffle/js/runtime/JSContext;
            2    6     4  prototype  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
       Name  Flags
      realm  final
      ctor   

  public com.oracle.truffle.api.object.Shape makeInitialShape(com.oracle.truffle.js.runtime.JSContext, com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/api/object/DynamicObject;)Lcom/oracle/truffle/api/object/Shape;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
        start local 1 // com.oracle.truffle.js.runtime.JSContext context
        start local 2 // com.oracle.truffle.api.object.DynamicObject prototype
         0: .line 96
            aload 2 /* prototype */
            getstatic com.oracle.truffle.js.runtime.builtins.JSWeakSet.INSTANCE:Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
            aload 1 /* context */
            invokestatic com.oracle.truffle.js.runtime.objects.JSObjectUtil.getProtoChildShape:(Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/js/runtime/builtins/JSClass;Lcom/oracle/truffle/js/runtime/JSContext;)Lcom/oracle/truffle/api/object/Shape;
            astore 3 /* initialShape */
        start local 3 // com.oracle.truffle.api.object.Shape initialShape
         1: .line 97
            aload 3 /* initialShape */
            areturn
        end local 3 // com.oracle.truffle.api.object.Shape initialShape
        end local 2 // com.oracle.truffle.api.object.DynamicObject prototype
        end local 1 // com.oracle.truffle.js.runtime.JSContext context
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    2     0          this  Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
            0    2     1       context  Lcom/oracle/truffle/js/runtime/JSContext;
            0    2     2     prototype  Lcom/oracle/truffle/api/object/DynamicObject;
            1    2     3  initialShape  Lcom/oracle/truffle/api/object/Shape;
    MethodParameters:
           Name  Flags
      context    
      prototype  

  public static com.oracle.truffle.js.runtime.builtins.JSConstructor createConstructor(com.oracle.truffle.js.runtime.JSRealm);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSRealm;)Lcom/oracle/truffle/js/runtime/builtins/JSConstructor;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.JSRealm realm
         0: .line 101
            getstatic com.oracle.truffle.js.runtime.builtins.JSWeakSet.INSTANCE:Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
            aload 0 /* realm */
            invokevirtual com.oracle.truffle.js.runtime.builtins.JSWeakSet.createConstructorAndPrototype:(Lcom/oracle/truffle/js/runtime/JSRealm;)Lcom/oracle/truffle/js/runtime/builtins/JSConstructor;
            areturn
        end local 0 // com.oracle.truffle.js.runtime.JSRealm realm
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0  realm  Lcom/oracle/truffle/js/runtime/JSRealm;
    MethodParameters:
       Name  Flags
      realm  

  public java.lang.String getClassName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
         0: .line 106
            ldc "WeakSet"
            areturn
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;

  public java.lang.String getClassName(com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
        start local 1 // com.oracle.truffle.api.object.DynamicObject object
         0: .line 111
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.runtime.builtins.JSWeakSet.getClassName:()Ljava/lang/String;
            areturn
        end local 1 // com.oracle.truffle.api.object.DynamicObject object
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
            0    1     1  object  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
        Name  Flags
      object  

  public java.lang.String toDisplayStringImpl(com.oracle.truffle.api.object.DynamicObject, int, boolean, com.oracle.truffle.js.runtime.JSContext);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;IZLcom/oracle/truffle/js/runtime/JSContext;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=5
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
        start local 1 // com.oracle.truffle.api.object.DynamicObject obj
        start local 2 // int depth
        start local 3 // boolean allowSideEffects
        start local 4 // com.oracle.truffle.js.runtime.JSContext context
         0: .line 117
            aload 4 /* context */
            invokevirtual com.oracle.truffle.js.runtime.JSContext.isOptionNashornCompatibilityMode:()Z
            ifeq 2
         1: .line 118
            new java.lang.StringBuilder
            dup
            ldc "["
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.runtime.builtins.JSWeakSet.getClassName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc "]"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
         2: .line 120
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.runtime.builtins.JSWeakSet.getClassName:()Ljava/lang/String;
            areturn
        end local 4 // com.oracle.truffle.js.runtime.JSContext context
        end local 3 // boolean allowSideEffects
        end local 2 // int depth
        end local 1 // com.oracle.truffle.api.object.DynamicObject obj
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    3     0              this  Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
            0    3     1               obj  Lcom/oracle/truffle/api/object/DynamicObject;
            0    3     2             depth  I
            0    3     3  allowSideEffects  Z
            0    3     4           context  Lcom/oracle/truffle/js/runtime/JSContext;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
                  Name  Flags
      obj               
      depth             
      allowSideEffects  
      context           

  public static boolean isJSWeakSet(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // java.lang.Object obj
         0: .line 125
            aload 0 /* obj */
            instanceof com.oracle.truffle.js.runtime.builtins.JSWeakSetObject
            ireturn
        end local 0 // java.lang.Object obj
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0   obj  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      obj   

  public com.oracle.truffle.api.object.DynamicObject getIntrinsicDefaultProto(com.oracle.truffle.js.runtime.JSRealm);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSRealm;)Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
        start local 1 // com.oracle.truffle.js.runtime.JSRealm realm
         0: .line 130
            aload 1 /* realm */
            invokevirtual com.oracle.truffle.js.runtime.JSRealm.getWeakSetPrototype:()Lcom/oracle/truffle/api/object/DynamicObject;
            areturn
        end local 1 // com.oracle.truffle.js.runtime.JSRealm realm
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSWeakSet this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/oracle/truffle/js/runtime/builtins/JSWeakSet;
            0    1     1  realm  Lcom/oracle/truffle/js/runtime/JSRealm;
    MethodParameters:
       Name  Flags
      realm  
}
SourceFile: "JSWeakSet.java"
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives
  public abstract Default = com.oracle.truffle.js.runtime.builtins.JSConstructorFactory$Default of com.oracle.truffle.js.runtime.builtins.JSConstructorFactory