Fixes bug in Object.freeze and Object.seal causing them to misbehave when...

Fixes bug in Object.freeze and Object.seal causing them to misbehave when Array.prototype has changed.

Object.freeze and Object.seal uses GetOwnPropertyNames which
returns an array with local property names. This array will also have
the additional properties defined on Array.prototype or
Object.prototype.

Note that, the implementation of GetOwnPropertyNames (when used as
Object.getOwnPropertyNames) is correct, since the spec says to create
a new Array (which would also have these properties).

Review URL: http://codereview.chromium.org/3137041

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5350 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/v8natives.js

@@ -743,8 +743,8 @@ function ObjectSeal(obj) {
     throw MakeTypeError("obj_ctor_property_non_object", ["seal"]);
   }
   var names = ObjectGetOwnPropertyNames(obj);
-  for (var key in names) {
-    var name = names[key];
+  for (var i = 0; i < names.length; i++) {
+    var name = names[i];
     var desc = GetOwnProperty(obj, name);
     if (desc.isConfigurable()) desc.setConfigurable(false);
     DefineOwnProperty(obj, name, desc, true);
@@ -759,8 +759,8 @@ function ObjectFreeze(obj) {
     throw MakeTypeError("obj_ctor_property_non_object", ["freeze"]);
   }
   var names = ObjectGetOwnPropertyNames(obj);
-  for (var key in names) {
-    var name = names[key];
+  for (var i = 0; i < names.length; i++) {
+    var name = names[i];
     var desc = GetOwnProperty(obj, name);
     if (IsDataDescriptor(desc)) desc.setWritable(false);
     if (desc.isConfigurable()) desc.setConfigurable(false);
@@ -786,10 +786,10 @@ function ObjectIsSealed(obj) {
     throw MakeTypeError("obj_ctor_property_non_object", ["isSealed"]);
   }
   var names = ObjectGetOwnPropertyNames(obj);
-  for (var key in names) {
-    var name = names[key];
+  for (var i = 0; i < names.length; i++) {
+    var name = names[i];
     var desc = GetOwnProperty(obj, name);
-    if (desc.isConfigurable()) return false;
+   if (desc.isConfigurable()) return false;
   }
   if (!ObjectIsExtensible(obj)) {
     return true;
@@ -804,8 +804,8 @@ function ObjectIsFrozen(obj) {
     throw MakeTypeError("obj_ctor_property_non_object", ["isFrozen"]);
   }
   var names = ObjectGetOwnPropertyNames(obj);
-  for (var key in names) {
-    var name = names[key];
+  for (var i = 0; i < names.length; i++) {
+    var name = names[i];
     var desc = GetOwnProperty(obj, name);
     if (IsDataDescriptor(desc) && desc.isWritable()) return false;
     if (desc.isConfigurable()) return false;

test/mjsunit/regress/regress-842.js

+// Copyright 2010 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// 842 describes a scenario where Object.prototype or Array.prototype is
+// changed (a property is added) after which freeze and seal would fail
+// since that property would be listed when doing a "for (var key in names)"
+
+Array.prototype.myfunc = function() {};
+Array.prototype[10] = 42;
+Array.prototype.length = 3000;
+
+var obj = { name: "n1" };
+
+try {
+  obj = Object.freeze(obj);
+} catch (e) {
+  assertUnreachable();
+}