| function f(arr) |
| { |
| assertEq(arr.shift(), 0); |
| } |
| |
| function test(out) |
| { |
| // Create an array of arrays, to be iterated over for [].shift-calling. We |
| // can't just loop on shift on a single array with non-writable length because |
| // shift throws when called on an array with non-writable length. |
| var arrs = out.arrs = []; |
| for (var i = 0; i < 100; i++) |
| arrs.push([0, 1, 2, 3]); |
| |
| // Use a much-greater capacity than the eventual non-writable length. |
| var a = [0, 1, 2, 3, 4, 5, 6, 7]; |
| Object.defineProperty(a, "length", { writable: false, value: 4 }); |
| |
| arrs.push(a); |
| |
| for (var i = 0, sz = arrs.length; i < sz; i++) |
| { |
| var arr = arrs[i]; |
| f(arr); |
| } |
| } |
| |
| var obj = {}; |
| var a, arrs; |
| |
| try |
| { |
| test(obj); |
| throw new Error("didn't throw!"); |
| } |
| catch (e) |
| { |
| assertEq(e instanceof TypeError, true, "expected TypeError, got " + e); |
| |
| arrs = obj.arrs; |
| assertEq(arrs.length, 101); |
| for (var i = 0; i < 100; i++) |
| { |
| assertEq(arrs[i].length, 3, "unexpected length for arrs[" + i + "]"); |
| assertEq(arrs[i][0], 1, "bad element for arrs[" + i + "][0]"); |
| assertEq(arrs[i][1], 2, "bad element for arrs[" + i + "][1]"); |
| assertEq(arrs[i][2], 3, "bad element for arrs[" + i + "][2]"); |
| assertEq(3 in arrs[i], false, "shouldn't be a third element"); |
| assertEq(arrs[i][3], undefined); |
| } |
| |
| a = arrs[100]; |
| assertEq(a[0], 1, "bad element for a[" + i + "]"); |
| assertEq(a[1], 2, "bad element for a[" + i + "]"); |
| assertEq(a[2], 3, "bad element for a[" + i + "]"); |
| assertEq(a.hasOwnProperty(3), false, "should have been deleted before throw"); |
| assertEq(a[3], undefined); |
| assertEq(a.length, 4, "length shouldn't have been changed"); |
| } |