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23
24description(
25"Tests that ArrayPop is known to the DFG to be a side effect."
26);
27
28function foo(a, b) {
29    var result = a.f;
30    result += b.pop();
31    result += a.g;
32    return result;
33}
34
35var ouches = 0;
36for (var i = 0; i < 200; ++i) {
37    var a = {f:1, g:2};
38    var b = [];
39    var expected;
40    if (i < 150) {
41        // Ensure that we always transition the array's structure to one that indicates
42        // that we have array storage.
43        b.__defineGetter__("0", function() {
44            testFailed("Should never get here");
45        });
46        b.length = 0;
47        b[0] = 42;
48        expected = "45";
49    } else {
50        b.__defineGetter__("0", function() {
51            debug("Ouch!");
52            ouches++;
53            delete a.g;
54            a.h = 43;
55            return 5;
56        });
57        expected = "0/0";
58    }
59    shouldBe("foo(a, b)", expected);
60}
61
62shouldBe("ouches", "50");
63