Make sure we don't leak map transitions from AccessorPairs to the Javascript world.

BUG=133211
TEST=test/mjsunit/regress/regress-133211.js

Review URL: https://chromiumcodereview.appspot.com/10559062

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11854 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -1123,11 +1123,13 @@ static MaybeObject* GetOwnProperty(Isolate* isolate,
     elms->set(IS_ACCESSOR_INDEX, heap->true_value());
 
     AccessorPair* accessors = AccessorPair::cast(result.GetCallbackObject());
-    if (CheckAccess(*obj, *name, &result, v8::ACCESS_GET)) {
-      elms->set(GETTER_INDEX, accessors->GetComponent(ACCESSOR_GETTER));
+    Object* getter = accessors->GetComponent(ACCESSOR_GETTER);
+    if (!getter->IsMap() && CheckAccess(*obj, *name, &result, v8::ACCESS_GET)) {
+      elms->set(GETTER_INDEX, getter);
     }
-    if (CheckAccess(*obj, *name, &result, v8::ACCESS_SET)) {
-      elms->set(SETTER_INDEX, accessors->GetComponent(ACCESSOR_SETTER));
+    Object* setter = accessors->GetComponent(ACCESSOR_SETTER);
+    if (!setter->IsMap() && CheckAccess(*obj, *name, &result, v8::ACCESS_SET)) {
+      elms->set(SETTER_INDEX, setter);
     }
   } else {
     elms->set(IS_ACCESSOR_INDEX, heap->false_value());

test/mjsunit/regress/regress-133211.js

+// Copyright 2011 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.
+
+// Make sure we don't leak maps when reading intermediate property descriptors.
+
+var o = {};
+var x = {};
+Object.defineProperty(o, "foo", { get: undefined });
+Object.defineProperty(x, "foo", { get: undefined, set: undefined });
+var pd = Object.getOwnPropertyDescriptor(o, "foo");
+assertEquals(undefined, pd.set);