Fix issue 191:

    http://code.google.com/p/v8/issues/detail?id=191

Accessor setters should not be called for eval-introduced context
extension objects.

This change fixes the issue, but I think it is time to separate out
the lookup routines for eval-introduced context extension objects.
There is no reason to use the general lookup routines for this.  I'll
do that in a separate changelist.
Review URL: http://codereview.chromium.org/18090

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1076 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -1599,7 +1599,7 @@ Object* JSObject::SetProperty(LookupResult* result,
     return JSObject::cast(proto)->SetProperty(result, name, value, attributes);
   }
 
-  if (result->IsNotFound() || !result->IsProperty()) {
+  if (!result->IsProperty() && !IsJSContextExtensionObject()) {
     // We could not find a local property so let's check whether there is an
     // accessor that wants to handle the property.
     LookupResult accessor_result;

test/mjsunit/regress/regress-191.js

+// Copyright 2009 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 that accessor setters are ignored on context extension
+// objects.
+// See http://code.google.com/p/v8/issues/detail?id=191
+
+var setterCalled = false;
+
+Object.prototype.__defineSetter__("x", function() { setterCalled = true; });
+
+function test() {
+  eval("var x = 42");
+  assertFalse(setterCalled, "accessor setter call on context object");
+  assertEquals(42, eval("x"));
+}
+
+test();