Migrated several tests from blink to V8 repository.

test/webkit/dfg-ensure-non-array-array-storage-on-window.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1.  Redistributions of source code must retain the above copyright
+//     notice, this list of conditions and the following disclaimer.
+// 2.  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.
+//
+// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
+
+description(
+"Tests that passing the global object to an array access that will arrayify to NonArrayWithArrayStorage doesn't break things."
+);
+
+function foo(array) {
+    var result = 0;
+    for (var i = 0; i < array.length; ++i)
+        result += array[i];
+    return result;
+}
+
+function bar(array) {
+    array[1] = 42;
+}
+
+var array = {};
+array.length = 3;
+array[0] = 1;
+array[1] = 2;
+array[2] = 3;
+for (var i = 0; i < 200; ++i) {
+    shouldBe("foo(array)", "6");
+
+    var otherArray = {};
+    bar(otherArray);
+    shouldBe("otherArray[1]", "42");
+}
+
+for (var i = 0; i < 1000; ++i) {
+    // Do strange things to ensure that the get_by_id on length goes polymorphic.
+    var array = {};
+    if (i % 2)
+        array.x = 42;
+    array.length = 3;
+    array[0] = 1;
+    array[2] = 3;
+    array.__defineGetter__(1, function() { return 6; });
+
+    shouldBe("foo(array)", "10");
+
+    var otherArray = {};
+    otherArray.__defineSetter__(0, function(value) { throw "error"; });
+    bar(otherArray);
+    shouldBe("otherArray[1]", "42");
+}
+
+var w = this;
+w[0] = 1;
+w.length = 1;
+var thingy = false;
+w.__defineSetter__(1, function(value) { thingy = value; });
+shouldBe("foo(w)", "1");
+shouldBe("thingy", "false");
+
+// At this point we check to make sure that bar doesn't end up either creating array storage for
+// the window proxy, or equally badly, storing to the already created array storage on the proxy
+// (since foo() may have made the mistake of creating array storage). That's why we do the setter
+// thingy, to detect that for index 1 we fall through the proxy to the real window object.
+bar(w);
+
+shouldBe("thingy", "42");
+shouldBe("foo(w)", "1");
+w.length = 2;
+shouldBe("foo(w)", "0/0");
+