The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/src/jit-test/tests/arrays/push-densely-loopy-nonwritable-length.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,56 @@
     1.4 +// Force recognition of a known-constant.
     1.5 +var push = Array.prototype.push;
     1.6 +
     1.7 +function f(arr)
     1.8 +{
     1.9 +  // Push an actual constant to trigger JIT-inlining of the effect of the push.
    1.10 +  push.call(arr, 99);
    1.11 +}
    1.12 +
    1.13 +function basic(out)
    1.14 +{
    1.15 +  // Create an array of arrays, to be iterated over for [].push-calling.  We
    1.16 +  // can't just loop on push on a single array with non-writable length because
    1.17 +  // push throws when called on an array with non-writable length.
    1.18 +  var arrs = out.arrs = [];
    1.19 +  for (var i = 0; i < 100; i++)
    1.20 +    arrs.push([]);
    1.21 +
    1.22 +  // Use a much-greater capacity than the eventual non-writable length.
    1.23 +  var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
    1.24 +  Object.defineProperty(a, "length", { writable: false, value: 6 });
    1.25 +
    1.26 +  arrs.push(a);
    1.27 +
    1.28 +  for (var i = 0, sz = arrs.length; i < sz; i++)
    1.29 +  {
    1.30 +    var arr = arrs[i];
    1.31 +    f(arr);
    1.32 +  }
    1.33 +}
    1.34 +
    1.35 +var obj = {};
    1.36 +var arrs, a;
    1.37 +
    1.38 +try
    1.39 +{
    1.40 +  basic(obj);
    1.41 +  throw new Error("didn't throw!");
    1.42 +}
    1.43 +catch (e)
    1.44 +{
    1.45 +  assertEq(e instanceof TypeError, true, "expected TypeError, got " + e);
    1.46 +
    1.47 +  arrs = obj.arrs;
    1.48 +  assertEq(arrs.length, 101);
    1.49 +  for (var i = 0; i < 100; i++)
    1.50 +  {
    1.51 +    assertEq(arrs[i].length, 1, "unexpected length for arrs[" + i + "]");
    1.52 +    assertEq(arrs[i][0], 99, "bad element for arrs[" + i + "]");
    1.53 +  }
    1.54 +
    1.55 +  a = arrs[100];
    1.56 +  assertEq(a.hasOwnProperty(6), false);
    1.57 +  assertEq(a[6], undefined);
    1.58 +  assertEq(a.length, 6);
    1.59 +}