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// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration()['arm64-simulator'])) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
// 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: [ArrayBuffer, Atomics, DataView, SharedArrayBuffer, Symbol, TypedArray]
---*/
const sab = new SharedArrayBuffer(1024);
const ab = new ArrayBuffer(16);
const views = intArrayConstructors.slice();
testWithTypedArrayConstructors(function(TA) {
// Make it interesting - use non-zero byteOffsets and non-zero indexes.
const view = new TA(sab, 32, 20);
const control = new TA(ab, 0, 2);
view[8] = 0;
assert.sameValue(Atomics.exchange(view, 8, 10), 0,
'Atomics.exchange(view, 8, 10) returns 0');
assert.sameValue(view[8], 10, 'The value of view[8] is 10');
assert.sameValue(Atomics.exchange(view, 8, -5), 10,
'Atomics.exchange(view, 8, -5) returns 10');
control[0] = -5;
assert.sameValue(view[8], control[0], 'The value of view[8] equals the value of `control[0]` (-5)');
view[3] = -5;
control[0] = -5;
assert.sameValue(Atomics.exchange(view, 3, 0), control[0],
'Atomics.exchange(view, 3, 0) returns the value of `control[0]` (-5)');
control[0] = 12345;
view[3] = 12345;
assert.sameValue(Atomics.exchange(view, 3, 0), control[0],
'Atomics.exchange(view, 3, 0) returns the value of `control[0]` (12345)');
control[0] = 123456789;
view[3] = 123456789;
assert.sameValue(Atomics.exchange(view, 3, 0), control[0],
'Atomics.exchange(view, 3, 0) returns the value of `control[0]` (123456789)');
// 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, 'Atomics.exchange(view, Idx, 0) returns 37');
});
}, views);
reportCompare(0, 0);
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