tricky-array-bounds-checks.js   [plain text]

function foo(a, i, p) {
    if (p || !DFGTrue())
        return [DFGTrue(), a[(i - (DFGTrue() ? 2147483646 : 0)) | 0], a[i], a[(i + (DFGTrue() ? 2147483646 : 0)) | 0], DFGTrue()];
    return [12];
}

noInline(foo);

function arraycmp(a, b) {
    if (a.length != b.length)
        return false;
    for (var i = 0; i < a.length; ++i) {
        if (a[i] != b[i])
            return false;
    }
    return true;
}

for (var i = 0; i < 100000; ++i) {
    var result = foo([42], 0, false);
    if (!arraycmp(result, [false, 42, 42, 42, false]) && !arraycmp(result, [12]))
        throw "Error: bad result for i = " + i + ": " + result;
}

var result = foo([1, 2, 3, 4, 5], -2147483646, true);
if (!arraycmp(result, [true, 5, void 0, void 0, false])
    && !arraycmp(result, [false, void 0, void 0, void 0, false]))
    throw "Error: bad result for trick: " + result;