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23
24description(
25"This tests that for/in statements behave correctly when cached."
26);
27
28function forIn1() {
29    var result = [];
30    var o = { x: 1 };
31    for (var p in o)
32        result.push(p);
33    return result;
34}
35forIn1();
36Object.prototype.y = 2;
37shouldBe("forIn1()", "['x', 'y']");
38delete Object.prototype.y;
39
40function forIn2() {
41    var result = [];
42    var o = { x: 1, __proto__: null };
43    for (var p in o)
44        result.push(p);
45    return result;
46}
47forIn2();
48shouldBe("forIn2()", "['x']");
49
50function forIn3(proto) {
51    var result = [];
52    var o = { x: 1, __proto__: proto };
53    for (var p in o)
54        result.push(p);
55    return result;
56}
57forIn3({ __proto__: { y1: 2 } });
58forIn3({ __proto__: { y1: 2 } });
59shouldBe("forIn3({ __proto__: { y1: 2 } })", "['x', 'y1']");
60
61forIn3({ y2 : 2, __proto__: null });
62forIn3({ y2 : 2, __proto__: null });
63shouldBe("forIn3({ y2 : 2, __proto__: null })", "['x', 'y2']");
64
65forIn3({ __proto__: { __proto__: { y3 : 2 } } });
66forIn3({ __proto__: { __proto__: { y3 : 2 } } });
67shouldBe("forIn3({ __proto__: { __proto__: { y3 : 2 } } })", "['x', 'y3']");
68
69function forIn4(o) {
70    var result = [];
71    for (var p in o)
72        result.push(p);
73    return result;
74}
75var objectWithArrayAsProto = {};
76objectWithArrayAsProto.__proto__ = [];
77shouldBe("forIn4(objectWithArrayAsProto)", "[]");
78objectWithArrayAsProto.__proto__[0]=1;
79shouldBe("forIn4(objectWithArrayAsProto)", "['0']");
80
81function forIn5(o) {
82    for (var i in o)
83        return [i, o[i]];
84}
85
86shouldBe("forIn5({get foo() { return 'called getter'} })", "['foo', 'called getter']");
87shouldBe("forIn5({set foo() { } })", "['foo', undefined]");
88shouldBe("forIn5({get foo() { return 'called getter'}, set foo() { }})", "['foo', 'called getter']");
89
90function cacheClearing() {
91    for(var j=0; j < 10; j++){
92        var o = {a:1,b:2,c:3,d:4,e:5}
93        try {for (i in o) { delete o.a; o = null; throw "" };}finally{continue}
94    }
95}
96
97cacheClearing()
98