| load(libdir + "asserts.js"); |
| |
| function f(arr, v1, v2) |
| { |
| // Ensure array_push_slowly is called by passing more than one argument. |
| arr.push(v1, v2); |
| } |
| |
| var N = 100; |
| |
| function test(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 < N; 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, 8675309, 3141592); |
| } |
| } |
| |
| var obj = {}; |
| |
| assertThrowsInstanceOf(function() { test(obj); }, TypeError); |
| |
| var arrs = obj.arrs; |
| assertEq(arrs.length, N + 1); |
| for (var i = 0; i < N; i++) |
| { |
| assertEq(arrs[i].length, 2, "unexpected length for arrs[" + i + "]"); |
| assertEq(arrs[i][0], 8675309, "bad element for arrs[" + i + "][0]"); |
| assertEq(arrs[i][1], 3141592, "bad element for arrs[" + i + "][1]"); |
| } |
| |
| var a = arrs[N]; |
| assertEq(a.hasOwnProperty(6), false); |
| assertEq(a[6], undefined); |
| assertEq(a.hasOwnProperty(7), false); |
| assertEq(a[7], undefined); |
| assertEq(a.length, 6); |