1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/class/superPropMegamorphic.js b/js/src/jit-test/tests/class/superPropMegamorphic.js
new file mode 100644
index 0000000000..489f6ececb
--- /dev/null
+++ b/js/src/jit-test/tests/class/superPropMegamorphic.js
@@ -0,0 +1,42 @@
+// Test GETPROP_SUPER with megamorphic variation
+const NCLASS = 20;
+
+var g_prop = "prop";
+var g_THIS = "THIS";
+
+// Define array of base classes with a data property and a getter property.
+let C = [];
+for (let i = 0; i < NCLASS; ++i) {
+    let klass = class {
+        get THIS() { return this; }
+    };
+    klass.prototype.prop = i;
+
+    C.push(klass);
+}
+
+// Derive class using super property access
+class D extends C[0] {
+    get prop() { return super.prop; }
+    get elem() { return super[g_prop]; }
+
+    get prop_this() { return super.THIS; }
+    get elem_this() { return super[g_THIS]; }
+}
+
+let d = new D();
+
+for (var j = 0; j < 4; ++j) {
+    for (var i = 0; i < 15; ++i) {
+        // Change base class by overriding [[HomeObject]].[[Prototype]]
+        Object.setPrototypeOf(D.prototype, C[j].prototype);
+
+        // Check we get property of correct class
+        assertEq(d.prop, j);
+        assertEq(d.elem, j);
+
+        // Check super getter gets |this| of object not base class
+        assertEq(d.prop_this, d);
+        assertEq(d.elem_this, d);
+    }
+}