1 files changed, 49 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arrays/pop-nonwritable-length-denseinitializedlength-below-length.js b/js/src/jit-test/tests/arrays/pop-nonwritable-length-denseinitializedlength-below-length.js
new file mode 100644
index 0000000000..9330f775ba
--- /dev/null
+++ b/js/src/jit-test/tests/arrays/pop-nonwritable-length-denseinitializedlength-below-length.js
@@ -0,0 +1,49 @@
+load(libdir + "asserts.js");
+
+function f(arr)
+{
+  assertEq(arr.pop(), undefined); // if it doesn't throw
+}
+
+var N = 100;
+
+function basic(out)
+{
+  // Create an array of arrays, to be iterated over for [].pop-calling.  We
+  // can't just loop on pop on a single array with non-writable length because
+  // pop throws when called on an array with non-writable length.
+  var arrs = out.arrs = [];
+  for (var i = 0; i < N; i++)
+  {
+    var arr = [0, 1, 2, 3, 4];
+    arr.length = 6;
+    arrs.push(arr);
+  }
+
+  var a = [0, 1, 2, 3, 4];
+  Object.defineProperty(a, "length", { writable: false, value: 6 });
+
+  arrs.push(a);
+
+  for (var i = 0, sz = arrs.length; i < sz; i++)
+    f(arrs[i]);
+}
+
+var obj = {};
+var arrs, a;
+
+assertThrowsInstanceOf(function() { basic(obj); }, TypeError);
+
+var arrs = obj.arrs;
+assertEq(arrs.length, N + 1);
+for (var i = 0; i < N; i++)
+{
+  assertEq(arrs[i].length, 5, "unexpected length for arrs[" + i + "]");
+  assertEq(arrs[i].hasOwnProperty(5), false,
+           "element not deleted for arrs[" + i + "]");
+}
+
+var a = arrs[N];
+assertEq(a.hasOwnProperty(5), false);
+assertEq(a[5], undefined);
+assertEq(a.length, 6);