1 files changed, 51 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arrays/push-slowly-loopy-nonwritable-length.js b/js/src/jit-test/tests/arrays/push-slowly-loopy-nonwritable-length.js
new file mode 100644
index 0000000000..79d8587153
--- /dev/null
+++ b/js/src/jit-test/tests/arrays/push-slowly-loopy-nonwritable-length.js
@@ -0,0 +1,51 @@
+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);