mirror of https://github.com/tc39/test262.git
57 lines
2.0 KiB
JavaScript
57 lines
2.0 KiB
JavaScript
// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
|
|
// This code is governed by the BSD license found in the LICENSE file.
|
|
|
|
/*---
|
|
esid: sec-atomics.exchange
|
|
description: Test Atomics.exchange on arrays that allow atomic operations.
|
|
includes: [testAtomics.js, testTypedArray.js]
|
|
features: [SharedArrayBuffer, ArrayBuffer, DataView, Atomics, arrow-function, let, TypedArray, for-of]
|
|
---*/
|
|
|
|
var sab = new SharedArrayBuffer(1024);
|
|
var ab = new ArrayBuffer(16);
|
|
|
|
var int_views = [Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array];
|
|
|
|
testWithTypedArrayConstructors(function(View) {
|
|
// Make it interesting - use non-zero byteOffsets and non-zero indexes.
|
|
|
|
var view = new View(sab, 32, 20);
|
|
var control = new View(ab, 0, 2);
|
|
|
|
view[8] = 0;
|
|
assert.sameValue(Atomics.exchange(view, 8, 10), 0,
|
|
"Exchange returns the value previously in the array");
|
|
assert.sameValue(view[8], 10);
|
|
|
|
assert.sameValue(Atomics.exchange(view, 8, -5), 10,
|
|
"Exchange returns the value previously in the array");
|
|
control[0] = -5;
|
|
assert.sameValue(view[8], control[0]);
|
|
|
|
view[3] = -5;
|
|
control[0] = -5;
|
|
assert.sameValue(Atomics.exchange(view, 3, 0), control[0],
|
|
"Result is subject to coercion");
|
|
|
|
control[0] = 12345;
|
|
view[3] = 12345;
|
|
assert.sameValue(Atomics.exchange(view, 3, 0), control[0],
|
|
"Result is subject to chopping");
|
|
|
|
control[0] = 123456789;
|
|
view[3] = 123456789;
|
|
assert.sameValue(Atomics.exchange(view, 3, 0), control[0],
|
|
"Result is subject to chopping");
|
|
|
|
// In-bounds boundary cases for indexing
|
|
testWithAtomicsInBoundsIndices(function(IdxGen) {
|
|
let Idx = IdxGen(view);
|
|
view.fill(0);
|
|
// Atomics.store() computes an index from Idx in the same way as other
|
|
// Atomics operations, not quite like view[Idx].
|
|
Atomics.store(view, Idx, 37);
|
|
assert.sameValue(Atomics.exchange(view, Idx, 0), 37);
|
|
});
|
|
}, int_views);
|