| // 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: > |
| Use default ArrayBuffer constructor on undefined buffer.constructor.@@species |
| 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. |
| |
| ... |
| 17. If SameValue(elementType, srcType) is true, then |
| a. Let data be ? CloneArrayBuffer(srcData, srcByteOffset). |
| ... |
| |
| 24.1.1.4 CloneArrayBuffer ( srcBuffer, srcByteOffset [ , cloneConstructor ] ) |
| |
| ... |
| 2. If cloneConstructor is not present, then |
| a. Let cloneConstructor be ? SpeciesConstructor(srcBuffer, %ArrayBuffer%). |
| ... |
| |
| 7.3.20 SpeciesConstructor ( O, defaultConstructor ) |
| |
| ... |
| 5. Let S be ? Get(C, @@species). |
| 6. If S is either undefined or null, return defaultConstructor. |
| ... |
| includes: [testTypedArray.js] |
| features: [Symbol.species, TypedArray] |
| ---*/ |
| |
| testWithTypedArrayConstructors(function(TA) { |
| var sample = new TA(4); |
| var ctor = {}; |
| |
| sample.buffer.constructor = ctor; |
| |
| ctor[Symbol.species] = undefined; |
| var typedArray = new TA(sample); |
| assert.sameValue( |
| Object.getPrototypeOf(typedArray.buffer), |
| ArrayBuffer.prototype, |
| "buffer ctor is not called when species is undefined" |
| ); |
| }); |