Check result of JSObject::NormalizeElements() in JSObject::PreventExtensions().

Normalization requires allocation so Failure object can be returned.

BUG=http://code.google.com/p/v8/issues/detail?id=851
TEST=test/mjsunit/regress/regress-851.js

Review URL: http://codereview.chromium.org/3262001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5364 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -2683,7 +2683,8 @@ bool JSObject::ReferencesObject(Object* obj) {
 Object* JSObject::PreventExtensions() {
   // If there are fast elements we normalize.
   if (HasFastElements()) {
-    NormalizeElements();
+    Object* ok = NormalizeElements();
+    if (ok->IsFailure()) return ok;
   }
   // Make sure that we never go back to fast case.
   element_dictionary()->set_requires_slow_elements();

test/mjsunit/regress/regress-851.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.
+
+var i = 0;
+for (var i = 0; i < 10000; i++) {
+  Object.freeze({});
+  assertFalse(JSON.stringify({x: null}).match(/\0/));
+}