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// 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%.prototype.subarray
description: >
Verify arguments on custom @@species construct call
info: |
22.2.3.27 %TypedArray%.prototype.subarray( begin , end )
...
17. Return ? TypedArraySpeciesCreate(O, argumentsList).
22.2.4.7 TypedArraySpeciesCreate ( exemplar, argumentList )
...
3. Let constructor be ? SpeciesConstructor(exemplar, defaultConstructor).
4. Return ? TypedArrayCreate(constructor, argumentList).
7.3.20 SpeciesConstructor ( O, defaultConstructor )
...
5. Let S be ? Get(C, @@species).
...
7. If IsConstructor(S) is true, return S.
...
22.2.4.6 TypedArrayCreate ( constructor, argumentList )
1. Let newTypedArray be ? Construct(constructor, argumentList).
2. Perform ? ValidateTypedArray(newTypedArray).
3. If argumentList is a List of a single Number, then
...
4. Return newTypedArray.
includes: [testTypedArray.js]
features: [Symbol.species, TypedArray]
---*/
testWithTypedArrayConstructors(function(TA) {
var sample = new TA([40, 41, 42]);
var expectedOffset = TA.BYTES_PER_ELEMENT;
var result, ctorThis;
sample.constructor = {};
sample.constructor[Symbol.species] = function(buffer, offset, length) {
result = arguments;
ctorThis = this;
return new TA(buffer, offset, length);
};
sample.subarray(1);
assert.sameValue(result.length, 3, "called with 3 arguments");
assert.sameValue(result[0], sample.buffer, "[0] is sample.buffer");
assert.sameValue(result[1], expectedOffset, "[1] is the byte offset pos");
assert.sameValue(result[2], 2, "[2] is expected length");
assert(
ctorThis instanceof sample.constructor[Symbol.species],
"`this` value in the @@species fn is an instance of the function itself"
);
});
reportCompare(0, 0);
|
