TypedArray and ArrayBuffer support for @@species

test/mjsunit/harmony/arraybuffer-species.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-species
+
+// ArrayBuffer.prototype.slice makes subclass and checks length
+
+class MyArrayBuffer extends ArrayBuffer { }
+assertEquals(MyArrayBuffer, new MyArrayBuffer(0).slice().constructor);
+
+class MyShortArrayBuffer extends ArrayBuffer {
+  constructor(length) { super(length - 1); }
+}
+assertThrows(() => new MyShortArrayBuffer(5).slice(0, 4), TypeError);
+
+class SingletonArrayBuffer extends ArrayBuffer {
+  constructor(...args) {
+    if (SingletonArrayBuffer.cached) return SingletonArrayBuffer.cached;
+    super(...args);
+    SingletonArrayBuffer.cached = this;
+  }
+}
+assertThrows(() => new SingletonArrayBuffer(5).slice(0, 4), TypeError);
+
+class NonArrayBuffer extends ArrayBuffer {
+  constructor() {
+    return {};
+  }
+}
+assertThrows(() => new NonArrayBuffer(5).slice(0, 4), TypeError);
+
+// Species fallback is ArrayBuffer
+class UndefinedArrayBuffer extends ArrayBuffer { }
+UndefinedArrayBuffer.prototype.constructor = undefined;
+assertEquals(ArrayBuffer, new UndefinedArrayBuffer(0).slice().constructor);