1 files changed, 46 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/bound-construct-derived-class-ctor.js b/js/src/jit-test/tests/cacheir/bound-construct-derived-class-ctor.js
new file mode 100644
index 0000000000..321fbb47f6
--- /dev/null
+++ b/js/src/jit-test/tests/cacheir/bound-construct-derived-class-ctor.js
@@ -0,0 +1,46 @@
+class Base {
+    constructor(b) {
+        this.b = b;
+    }
+}
+class Derived extends Base {
+    constructor(a, b) {
+        super(b);
+        this.a = a;
+    }
+}
+
+function testSimple() {
+    var boundCtor = Derived.bind(null, 1);
+    for (var i = 0; i < 100; i++) {
+        var o = new boundCtor(2);
+        assertEq(o.a, 1);
+        assertEq(o.b, 2);
+
+    }
+}
+testSimple();
+
+function testMegamorphic() {
+    var ctors = [
+        function(a, b) { this.a = a; this.b = b; this.c = 1; }.bind(null, 1),
+        function(a, b) { this.a = a; this.b = b; this.c = 2; }.bind(null, 1),
+        function(a, b) { this.a = a; this.b = b; this.c = 3; }.bind(null, 1),
+        function(a, b) { this.a = a; this.b = b; this.c = 4; }.bind(null, 1),
+        function(a, b) { this.a = a; this.b = b; this.c = 5; }.bind(null, 1),
+        function(a, b) { this.a = a; this.b = b; this.c = 6; }.bind(null, 1),
+        function(a, b) { this.a = a; this.b = b; this.c = 7; }.bind(null, 1),
+        function(a, b) { this.a = a; this.b = b; this.c = 8; }.bind(null, 1),
+        function(a, b) { this.a = a; this.b = b; this.c = 9; }.bind(null, 1),
+        function(a, b) { this.a = a; this.b = b; this.c = 10; }.bind(null, 1),
+        Derived.bind(null, 1),
+        Derived.bind(null, 1),
+    ];
+    for (var i = 0; i < 100; i++) {
+        var ctor = ctors[i % ctors.length];
+        var o = new ctor(2);
+        assertEq(o.a, 1);
+        assertEq(o.b, 2);
+    }
+}
+testMegamorphic();