src/third_party/mozjs-45/js/src/jit-test/tests/ion/getelem.js

function testValue() {
    function f(arr, x) {
        return arr[x];
    }
    var a = [1, undefined, null, Math, 2.1, ""];
    for (var i=0; i<50; i++) {
        assertEq(f(a, 0), 1);
        assertEq(f(a, 1), undefined);
        assertEq(f(a, 2), null);
        assertEq(f(a, 3), Math);
        assertEq(f(a, 4), 2.1);
        assertEq(f(a, 5), "");
        assertEq(f(a, -1), undefined);
        assertEq(f(a, 6), undefined);
    }
}
testValue();

function testOutOfBounds() {
    function f(arr, x) {
        return arr[x];
    }
    var a = [0, 1, 2, 3, 4];

    for (var j=0; j<4; j++) {
        for (var i=0; i<5; i++) {
            assertEq(f(a, i), i);
        }
        for (var i=5; i<10; i++) {
            assertEq(f(a, i), undefined);
        }
        for (var i=-1; i>-10; i--) {
            assertEq(f(a, i), undefined);
        }
    }
}
testOutOfBounds();

function testHole() {
    function f(arr, x) {
        return arr[x];
    }
    var a = [0, , 2, ];
    for (var i=0; i<70; i++) {
        assertEq(f(a, 0), 0);
        assertEq(f(a, 1), undefined);
        assertEq(f(a, 2), 2);
        assertEq(f(a, 3), undefined);
    }
}
testHole();

function testClassGuard() {
    function f(arr) {
        return arr[2];
    }
    var a = [1, 2, 3, 4];
    for (var i=0; i<90; i++) {
        assertEq(f(a), 3);
    }
    var b = {2: 100};
    assertEq(f(b), 100);
}
testClassGuard();

function testGeneric1() {
    function f(o, i) {
        return o[i];
    }
    for (var i=0; i<100; i++) {
        assertEq(f("abc", 1), "b");
        assertEq(f("foo", "length"), 3);
        assertEq(f([], -1), undefined);
        assertEq(f({x: 1}, "x"), 1);
    }
}
testGeneric1();