Migrated several tests from blink to V8 repository.

test/webkit/dictionary-prototype-caching.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("Test to ensure correct behaviour of prototype caching with dictionary prototypes");
+
+function protoTest(o) {
+    return o.protoProp;
+}
+
+var proto = {protoProp: "PASS", propToRemove: "foo"};
+var o = { __proto__: proto };
+
+delete proto.propToRemove;
+
+// Prototype lookup caching will attempt to convert proto back to an ordinary structure
+protoTest(o);
+protoTest(o);
+protoTest(o);
+shouldBe("protoTest(o)", "'PASS'");
+delete proto.protoProp;
+proto.fakeProtoProp = "FAIL";
+shouldBeUndefined("protoTest(o)");
+
+function protoTest2(o) {
+    return o.b;
+}
+
+var proto = {a:1, b:"meh", c:2};
+var o = { __proto__: proto };
+
+delete proto.b;
+proto.d = 3;
+protoTest2(o);
+protoTest2(o);
+protoTest2(o);
+var protoKeys = [];
+for (var i in proto)
+    protoKeys.push(proto[i]);
+
+shouldBe("protoKeys", "[1,2,3]");
+
+function protoTest3(o) {
+    return o.b;
+}
+
+var proto = {a:1, b:"meh", c:2};
+var o = { __proto__: proto };
+
+delete proto.b;
+protoTest2(o);
+protoTest2(o);
+protoTest2(o);
+proto.d = 3;
+var protoKeys = [];
+for (var i in proto)
+    protoKeys.push(proto[i]);
+
+shouldBe("protoKeys", "[1,2,3]");
+
+function testFunction(o) {
+    return o.test;
+}
+
+var proto = { test: true };
+var subclass1 = { __proto__: proto };
+var subclass2 = { __proto__: proto };
+for (var i = 0; i < 500; i++)
+    subclass2["a"+i]="a"+i;
+
+testFunction(subclass1);
+shouldBeTrue("testFunction(subclass1)");
+shouldBeTrue("testFunction(subclass2)");
+proto.test = false
+subclass2.test = true;
+shouldBeTrue("testFunction(subclass2)");