1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/watchtower/megamorphic-long-proto-chain.js b/js/src/jit-test/tests/watchtower/megamorphic-long-proto-chain.js
new file mode 100644
index 0000000000..105547ef55
--- /dev/null
+++ b/js/src/jit-test/tests/watchtower/megamorphic-long-proto-chain.js
@@ -0,0 +1,30 @@
+// |jit-test| --enable-watchtower
+
+setJitCompilerOption("ic.force-megamorphic", 1);
+
+function objectWithHops(hops) {
+    var o = Object.create(null);
+    o.hops = hops;
+    for (var i = 0; i < hops; i++) {
+        o = Object.create(o);
+    }
+    return o;
+}
+function test() {
+    var objs = [];
+    for (var i = 0; i < 32; i++) {
+        objs.push(objectWithHops(230 + i));
+    }
+    for (var i = 0; i < 130; i++) {
+        var o = objs[i % objs.length];
+        assertEq(o.hops, 230 + (i % objs.length));
+        assertEq("hops" in o, true);
+        assertEq(Object.hasOwnProperty.call(o, "hops"), false);
+        assertEq(o.missing, undefined);
+        assertEq("missing" in o, false);
+        assertEq(Object.hasOwnProperty.call(o, "missing"), false);
+    }
+}
+for (var i = 0; i < 10; i++) {
+  test();
+}