1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arguments/arguments-on-proto.js b/js/src/jit-test/tests/arguments/arguments-on-proto.js
new file mode 100644
index 0000000000..745c77b9da
--- /dev/null
+++ b/js/src/jit-test/tests/arguments/arguments-on-proto.js
@@ -0,0 +1,27 @@
+function create() {
+    return Object.create(arguments, {2: {value: "shadowed"}});
+}
+
+function createStrict() {
+    "use strict";
+    return Object.create(arguments, {40: {value: "shadowed2"}});
+}
+
+function f() {
+    var args = [createStrict(10, 20, 30, 40), create(1, 2, 3)];
+
+    var threshold = getJitCompilerOptions()["ion.warmup.trigger"] + 101;
+
+    for (var i = 0; i < threshold; i++) {
+        // We switch between different arguments objects, to make
+        // sure the right IC is triggered.
+        var a = args[i % 2];
+        assertEq(a.length, (i % 2) ? 3 : 4);
+        assertEq(a[0], (i % 2) ? 1 : 10);
+        assertEq(a[1], (i % 2) ? 2 : 20);
+        assertEq(a[2], (i % 2) ? "shadowed" : 30);
+        assertEq(a[3], (i % 2) ? undefined : 40);
+    }
+}
+
+f();