[runtime] PreventExtensionsWithTransition: before adding the new

test/mjsunit/harmony/private.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 322 matching lines @@
   var obj = {}
   obj[publicSymbol] = 1
   obj[privateSymbol] = 2
   obj[publicSymbol2] = 3
   var syms = Object.getOwnPropertySymbols(obj)
   assertEquals(syms, [publicSymbol, publicSymbol2])
 }
 TestGetOwnPropertySymbols()
 
 
-function TestSealAndFreeze(freeze) {
+function TestSealAndFreeze(factory, freeze, isFrozen) {
   var sym = %CreatePrivateSymbol("private")
-  var obj = {}
+  var obj = factory();
   obj[sym] = 1
   freeze(obj)
+  assertTrue(isFrozen(obj))
   obj[sym] = 2
   assertEquals(2, obj[sym])
   assertTrue(delete obj[sym])
   assertEquals(undefined, obj[sym])
 }
-TestSealAndFreeze(Object.seal)
-TestSealAndFreeze(Object.freeze)
-TestSealAndFreeze(Object.preventExtensions)
+
+var fastObj = () => {
+  var obj = {}
+  assertTrue(%HasFastProperties(obj))
+  return obj
+}
+var dictObj = () => {
+  var obj = Object.create(null)
+  obj.a = 1
+  delete obj.a
+  assertFalse(%HasFastProperties(obj))
+  return obj
+}
+
+TestSealAndFreeze(fastObj, Object.seal, Object.isSealed)
+TestSealAndFreeze(fastObj, Object.freeze,  Object.isFrozen)
+TestSealAndFreeze(fastObj, Object.preventExtensions, obj => !Object.isExtensible(obj))
+TestSealAndFreeze(dictObj, Object.seal, Object.isSealed)
+TestSealAndFreeze(dictObj, Object.freeze,  Object.isFrozen)
+TestSealAndFreeze(dictObj, Object.preventExtensions, obj => !Object.isExtensible(obj))
 
 
 var s = %CreatePrivateSymbol("s");
 var s1 = %CreatePrivateSymbol("s1");
 
 function TestSimple() {
   var p = {}
   p[s] = "moo";
 
   var o = Object.create(p);
@@ skipping 29 matching lines @@
 
   // Test non-monomorphic.
   for (var i = 0; i < 1000; i++) {
     var oNew = Object.create(p);
     oNew["s" + i] = i;
     oNew[s1] = "bow-wow";
     checkNonOwn(oNew);
   }
 }
 TestICs();