Handle changes to the Object prototype in fast handling of arrays

test/mjsunit/regress/regress-1403.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.
+
+// See: http://code.google.com/p/v8/issues/detail?id=1403

[antonm, 2011/05/24 10:38:20]

do we have similar test case when Array.prototype.__proto__ is mutated?

[Søren Thygesen Gjesse, 2011/05/24 12:25:52]

Don't know. Added one here.

+
+a = new Array();

[antonm, 2011/05/24 10:38:20]

nit: a = [] might be easier to read

[Søren Thygesen Gjesse, 2011/05/24 12:25:52]

Done.

+p = {}
+p.__proto__ = null;
+Object.prototype.__proto__ = p;

[antonm, 2011/05/24 10:38:20]

nit: maybe (for compactness): Object.prototype.__proto__ = { __proto__: null };

[Søren Thygesen Gjesse, 2011/05/24 12:25:52]

Done.

+a.shift();

[antonm, 2011/05/24 10:38:20]

I would consider adding indexed properties on Object.prototype.__proto__ to
check they are handled correctly.

[Søren Thygesen Gjesse, 2011/05/24 12:25:52]

There are tests of this in array-elements-from-array-prototype-chain.js