Handle JavaScript accessors on the global object.

With the new representation of the global object adding JavaScript accessors for a property after global inline caches was created for that property did not work property as the inline caches did not take the JavaScript accessor information (fixed array with two elements) that could be present in a global object property cell into account.

This is now fixed by changing the map for a global object when a JavaScript accessor is defined on it.

BUG=394
TEST=test\mjsunit\regress\regress-394.js
Review URL: http://codereview.chromium.org/150162

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2317 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -2738,6 +2738,14 @@ Object* JSObject::DefineGetterSetter(String* name,
     Object* ok = NormalizeProperties(CLEAR_INOBJECT_PROPERTIES);
     if (ok->IsFailure()) return ok;
 
+    // For the global object allocate a new map to invalidate the global inline
+    // caches which have a global property cell reference directly in the code.
+    if (IsJSGlobalObject()) {
+      Object* new_map = map()->CopyDropDescriptors();
+      if (new_map->IsFailure()) return new_map;
+      set_map(Map::cast(new_map));
+    }
+
     // Update the dictionary with the new CALLBACKS property.
     return SetNormalizedProperty(name, structure, details);
   }

test/mjsunit/regress/regress-394.js

+// Copyright 2008 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.
+
+// See <URL:http://code.google.com/p/v8/issues/detail?id=394>
+
+function setx(){
+  x=1;
+}
+
+function getx(){
+  return x;
+}
+
+setx()
+setx()
+__defineSetter__('x',function(){});
+__defineGetter__('x',function(){return 2;});
+setx()
+assertEquals(2, x);
+
+assertEquals(2, getx());
+assertEquals(2, getx());
+assertEquals(2, getx());