v8/test/webkit/for-in-cached.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(
"This tests that for/in statements behave correctly when cached."
);

function forIn1() {
    var result = [];
    var o = { x: 1 };
    for (var p in o)
        result.push(p);
    return result;
}
forIn1();
Object.prototype.y = 2;
shouldBe("forIn1()", "['x', 'y']");
delete Object.prototype.y;

function forIn2() {
    var result = [];
    var o = { x: 1, __proto__: null };
    for (var p in o)
        result.push(p);
    return result;
}
forIn2();
shouldBe("forIn2()", "['x']");

function forIn3(proto) {
    var result = [];
    var o = { x: 1, __proto__: proto };
    for (var p in o)
        result.push(p);
    return result;
}
forIn3({ __proto__: { y1: 2 } });
forIn3({ __proto__: { y1: 2 } });
shouldBe("forIn3({ __proto__: { y1: 2 } })", "['x', 'y1']");

forIn3({ y2 : 2, __proto__: null });
forIn3({ y2 : 2, __proto__: null });
shouldBe("forIn3({ y2 : 2, __proto__: null })", "['x', 'y2']");

forIn3({ __proto__: { __proto__: { y3 : 2 } } });
forIn3({ __proto__: { __proto__: { y3 : 2 } } });
shouldBe("forIn3({ __proto__: { __proto__: { y3 : 2 } } })", "['x', 'y3']");

function forIn4(o) {
    var result = [];
    for (var p in o)
        result.push(p);
    return result;
}
var objectWithArrayAsProto = {};
objectWithArrayAsProto.__proto__ = [];
shouldBe("forIn4(objectWithArrayAsProto)", "[]");
objectWithArrayAsProto.__proto__[0]=1;
shouldBe("forIn4(objectWithArrayAsProto)", "['0']");

function forIn5(o) {
    for (var i in o)
        return [i, o[i]];
}

shouldBe("forIn5({get foo() { return 'called getter'} })", "['foo', 'called getter']");
shouldBe("forIn5({set foo() { } })", "['foo', undefined]");
shouldBe("forIn5({get foo() { return 'called getter'}, set foo() { }})", "['foo', 'called getter']");

function cacheClearing() {
    for(var j=0; j < 10; j++){
        var o = {a:1,b:2,c:3,d:4,e:5}
        try {for (i in o) { delete o.a; o = null; throw "" };}finally{continue}
    }
}

cacheClearing()