JSTests/test262/test/built-ins/TypedArrayConstructors/ctors/typedarray-arg/other-ctor-buffer-ctor-custom-species-proto-from-ctor-realm.js

// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-typedarray-typedarray
description: >
  Derive the ArrayBuffer prototype from the realm of the species constructor
info: |
  22.2.4.3 TypedArray ( typedArray )

  This description applies only if the TypedArray function is called with at
  least one argument and the Type of the first argument is Object and that
  object has a [[TypedArrayName]] internal slot.

  ...
  18. Else,
    a. Let bufferConstructor be ? SpeciesConstructor(srcData, %ArrayBuffer%).
    b. Let data be ? AllocateArrayBuffer(bufferConstructor, byteLength).
  ...

  7.3.20 SpeciesConstructor ( O, defaultConstructor )

  ...
  5. Let S be ? Get(C, @@species).
  6. If S is either undefined or null, return defaultConstructor.
  7. If IsConstructor(S) is true, return S.
  ...

  9.1.14 GetPrototypeFromConstructor

  ...
  3. Let proto be ? Get(constructor, "prototype").
  4. If Type(proto) is not Object, then
     a. Let realm be ? GetFunctionRealm(constructor).
     b. Let proto be realm's intrinsic object named intrinsicDefaultProto.
  ...
includes: [testTypedArray.js]
features: [cross-realm, Symbol.species, TypedArray]
---*/

var sample1 = new Int8Array();
var sample2 = new Int16Array();
var other = $262.createRealm().global;
var C = new other.Function();
C.prototype = null;


testWithTypedArrayConstructors(function(TA) {
  var sample = TA === Int8Array ? sample2 : sample1;
  var ctor = {};

  sample.buffer.constructor = ctor;

  ctor[Symbol.species] = C;

  var typedArray = new TA(sample);
  assert.sameValue(
    Object.getPrototypeOf(typedArray.buffer), other.ArrayBuffer.prototype
  );
});