1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/gc/elements-post-write-barrier.js b/js/src/jit-test/tests/gc/elements-post-write-barrier.js
new file mode 100644
index 000000000..04249eb72
--- /dev/null
+++ b/js/src/jit-test/tests/gc/elements-post-write-barrier.js
@@ -0,0 +1,27 @@
+gczeal(12);
+
+var length = 10000;
+var array = new Array(length);
+array.fill(null);
+
+// Promote the array to the tenured heap, if it isn't already there.
+minorgc();
+
+for (var i = 0; i < length; i++) {
+  // Exercise that barrier with some fresh nursery object references!
+  array[i] = {};
+}
+
+minorgc();
+
+for (var i = length; i > 0; i--) {
+  array[i - 1] = {};
+}
+
+minorgc();
+
+for (var i = 0; i < length; i++) {
+  array[Math.floor(Math.random() * length)] = {};
+}
+
+gc();