| // 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. |
| |
| ... |
| 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. |
| ... |
| |
| includes: [testBigIntTypedArray.js] |
| features: [BigInt, Symbol.species, TypedArray] |
| ---*/ |
| |
| var sample1 = new BigInt64Array(); |
| var sample2 = new BigUint64Array(); |
| |
| testWithBigIntTypedArrayConstructors(function(TA) { |
| var sample = TA === BigInt64Array ? sample2 : sample1; |
| var ctor = {}; |
| var called = 0; |
| var custom = {}; |
| |
| sample.buffer.constructor = ctor; |
| |
| ctor[Symbol.species] = function() { |
| called++; |
| }; |
| |
| ctor[Symbol.species].prototype = custom; |
| |
| var typedArray = new TA(sample); |
| assert.sameValue(Object.getPrototypeOf(typedArray.buffer), custom); |
| assert.sameValue(called, 0); |
| }); |