Fix issue with setters and their holders in accessors.cc

test/mjsunit/regress/regress-3462.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+function TestFunctionPrototypeSetter() {
+  var f = function() {};
+  var o = {__proto__: f};
+  o.prototype = 42;
+  assertEquals(42, o.prototype);
+  assertTrue(o.hasOwnProperty('prototype'));
+}
+TestFunctionPrototypeSetter();
+
+
+function TestFunctionPrototypeSetterOnValue() {
+  var f = function() {};
+  var fp = f.prototype;
+  Number.prototype.__proto__ = f;
+  var n = 42;
+  var o = {};
+  n.prototype = o;
+  assertEquals(fp, n.prototype);
+  assertEquals(fp, f.prototype);
+  assertFalse(Number.prototype.hasOwnProperty('prototype'));
+}
+TestFunctionPrototypeSetterOnValue();
+
+
+function TestArrayLengthSetter() {
+  var a = [1];
+  var o = {__proto__: a};
+  o.length = 2;
+  assertEquals(2, o.length);
+  assertEquals(1, a.length);
+  assertTrue(o.hasOwnProperty('length'));
+}
+TestArrayLengthSetter();
+
+
+function TestArrayLengthSetterOnValue() {
+  Number.prototype.__proto__ = [1];
+  var n = 42;
+  n.length = 2;
+  assertEquals(1, n.length);
+  assertFalse(Number.prototype.hasOwnProperty('length'));
+}
+TestArrayLengthSetterOnValue();