Merged r17459, r17462, r17474 into 3.20 branch.

test/mjsunit/regress/regress-2980.js

 // Copyright 2013 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.
 
-function s(v) {
-  v.x = 1;
+
+function test(expected, holder) {
+  assertEquals(expected, holder.property);
 }
 
-function s_strict(v) {
-  "use strict";
-  v.x = 1;
+var holder = {}
+holder.__proto__ = null;
+holder.property = "foo";
+delete holder.property;
+test(undefined, holder);
+test(undefined, holder);
+test(undefined, holder);
+holder.property = "bar";
+test("bar", holder);
+test("bar", holder);
+
+// Now the same thing with a nontrivial prototype chain.
+
+function test2(expected, holder) {
+  assertEquals(expected, holder.prop2);
 }
 
-function c(p) {
-  return {__proto__: p};
-}
+var holder2 = {}
+holder2.prop2 = "foo";
+holder2.__proto__ = null;
+function Receiver() {}
+Receiver.prototype = holder2;
 
-var p = {};
+var rec2 = new Receiver();
+delete holder2.prop2;
 
-var o1 = c(p);
-var o2 = c(p);
-var o3 = c(p);
-var o4 = c(p);
-
-// Make p go slow.
-// Do this after using p as prototype, since using an object as prototype kicks
-// it back into fast mode.
-p.y = 1;
-delete p.y;
-p.x = 5;
-
-// Initialize the store IC.
-s(o1);
-s(o2);
-s_strict(o1);
-s_strict(o2);
-
-// Make x non-writable.
-Object.defineProperty(p, "x", { writable: false });
-
-// Verify that direct setting fails.
-o3.x = 20;
-assertEquals(5, o3.x);
-
-// Verify that setting through the IC fails.
-s(o4);
-assertEquals(5, o4.x);
-assertThrows("s_strict(o4);", TypeError);
+test2(undefined, rec2);
+test2(undefined, rec2);
+test2(undefined, rec2);
+holder2.prop2 = "bar";
+test2("bar", rec2);
+test2("bar", rec2);