| // Force recognition of a known-constant. |
| var push = Array.prototype.push; |
| |
| function f(arr) |
| { |
| // Push an actual constant to trigger JIT-inlining of the effect of the push. |
| push.call(arr, 99); |
| } |
| |
| function basic(out) |
| { |
| // Create an array of arrays, to be iterated over for [].push-calling. We |
| // can't just loop on push on a single array with non-writable length because |
| // push throws when called on an array with non-writable length. |
| var arrs = out.arrs = []; |
| for (var i = 0; i < 100; i++) |
| arrs.push([]); |
| |
| // Use a much-greater capacity than the eventual non-writable length. |
| var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]; |
| Object.defineProperty(a, "length", { writable: false, value: 6 }); |
| |
| arrs.push(a); |
| |
| for (var i = 0, sz = arrs.length; i < sz; i++) |
| { |
| var arr = arrs[i]; |
| f(arr); |
| } |
| } |
| |
| var obj = {}; |
| var arrs, a; |
| |
| try |
| { |
| basic(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, 1, "unexpected length for arrs[" + i + "]"); |
| assertEq(arrs[i][0], 99, "bad element for arrs[" + i + "]"); |
| } |
| |
| a = arrs[100]; |
| assertEq(a.hasOwnProperty(6), false); |
| assertEq(a[6], undefined); |
| assertEq(a.length, 6); |
| } |