1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/unboxed-element-hole.js b/js/src/jit-test/tests/cacheir/unboxed-element-hole.js
new file mode 100644
index 0000000000..c3afd13dab
--- /dev/null
+++ b/js/src/jit-test/tests/cacheir/unboxed-element-hole.js
@@ -0,0 +1,41 @@
+function noElement() {
+    for (var i = 0; i < 1e4; i++) {
+        var obj = {length: 0};
+        assertEq(obj[0], undefined);
+    }
+}
+
+function noElementCheckPrototype() {
+    for (var i = 0; i < 1e4; i++) {
+        var obj = {length: 0};
+        assertEq(obj[0], i <= 1e3 ? undefined : 1);
+        if (i == 1e3) {
+            Object.prototype[0] = 1;
+        }
+    }
+    delete Object.prototype[0];
+}
+
+function elementOnPrototype() {
+    Object.prototype[0] = 3;
+    for (var i = 0; i < 1e4; i++) {
+        var obj = {length: 0};
+        assertEq(obj[0], 3);
+    }
+    delete Object.prototype[0];
+}
+
+function checkExpando() {
+    for (var i = 0; i < 1e4; i++) {
+        var obj = {length: 0};
+        if (i >= 1e3) {
+            obj[0] = 2;
+        }
+        assertEq(obj[0], i < 1e3 ? undefined : 2);
+    }
+}
+
+noElement();
+noElementCheckPrototype();
+elementOnPrototype();
+checkExpando();