Reland of Use ES2015-style TypedArray prototype chain

test/mjsunit/es6/classes-subclass-builtins.js

Index: test/mjsunit/es6/classes-subclass-builtins.js
diff --git a/test/mjsunit/es6/classes-subclass-builtins.js b/test/mjsunit/es6/classes-subclass-builtins.js
index e4d44be06adbc3695188430be6eb74674a023ec6..313aad1d8f6190eb7d3624e5572876f548d9eb62 100644
--- a/test/mjsunit/es6/classes-subclass-builtins.js
+++ b/test/mjsunit/es6/classes-subclass-builtins.js
@@ -349,7 +349,43 @@
 })();
 
 
-function TestArraySubclassing(array) {
+(function TestArraySubclassing() {
+  class A extends Array {
+    constructor(...args) {
+      assertFalse(new.target === undefined);
+      super(...args);
+      this.a = 42;
+      this.d = 4.2;
+      this.o = {foo:153};
+    }
+  }
+
+  var o = new Array(13);
+  assertTrue(o instanceof Object);
+  assertTrue(o instanceof Array);
+  assertEquals("object", typeof o);
+  checkPrototypeChain(o, [Array, Object]);
+  assertEquals(13, o.length);
+
+  var o = new A(10);
+  assertTrue(o instanceof Object);
+  assertTrue(o instanceof Array);
+  assertTrue(o instanceof A);
+  assertEquals("object", typeof o);
+  checkPrototypeChain(o, [A, Array, Object]);
+  assertEquals(10, o.length);
+  assertEquals(42, o.a);
+  assertEquals(4.2, o.d);
+  assertEquals(153, o.o.foo);
+
+  var o1 = new A(7);
+  assertTrue(%HaveSameMap(o, o1));
+})();
+
+
+var TypedArray = Uint8Array.__proto__;
+
+function TestTypedArraySubclassing(array) {
   class A extends array {
     constructor(...args) {
       assertFalse(new.target === undefined);
@@ -362,17 +398,19 @@
 
   var o = new array(13);
   assertTrue(o instanceof Object);
+  assertTrue(o instanceof TypedArray);
   assertTrue(o instanceof array);
   assertEquals("object", typeof o);
-  checkPrototypeChain(o, [array, Object]);
+  checkPrototypeChain(o, [array, TypedArray, Object]);
   assertEquals(13, o.length);
 
   var o = new A(10);
   assertTrue(o instanceof Object);
+  assertTrue(o instanceof TypedArray);
   assertTrue(o instanceof array);
   assertTrue(o instanceof A);
   assertEquals("object", typeof o);
-  checkPrototypeChain(o, [A, array, Object]);
+  checkPrototypeChain(o, [A, array, TypedArray, Object]);
   assertEquals(10, o.length);
   assertEquals(42, o.a);
   assertEquals(4.2, o.d);
@@ -384,16 +422,15 @@
 
 
 (function() {
-  TestArraySubclassing(Array);
-  TestArraySubclassing(Int8Array);
-  TestArraySubclassing(Uint8Array);
-  TestArraySubclassing(Uint8ClampedArray);
-  TestArraySubclassing(Int16Array);
-  TestArraySubclassing(Uint16Array);
-  TestArraySubclassing(Int32Array);
-  TestArraySubclassing(Uint32Array);
-  TestArraySubclassing(Float32Array);
-  TestArraySubclassing(Float64Array);
+  TestTypedArraySubclassing(Int8Array);
+  TestTypedArraySubclassing(Uint8Array);
+  TestTypedArraySubclassing(Uint8ClampedArray);
+  TestTypedArraySubclassing(Int16Array);
+  TestTypedArraySubclassing(Uint16Array);
+  TestTypedArraySubclassing(Int32Array);
+  TestTypedArraySubclassing(Uint32Array);
+  TestTypedArraySubclassing(Float32Array);
+  TestTypedArraySubclassing(Float64Array);
 })();