good-views.js (2389B)
1 // |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 2 // Copyright (C) 2017 Mozilla Corporation. All rights reserved. 3 // This code is governed by the BSD license found in the LICENSE file. 4 5 /*--- 6 esid: sec-atomics.exchange 7 description: Test Atomics.exchange on arrays that allow atomic operations. 8 includes: [testAtomics.js, testTypedArray.js] 9 features: [ArrayBuffer, Atomics, DataView, SharedArrayBuffer, Symbol, TypedArray] 10 ---*/ 11 12 const sab = new SharedArrayBuffer(1024); 13 const ab = new ArrayBuffer(16); 14 const views = nonClampedIntArrayConstructors.slice(); 15 16 testWithTypedArrayConstructors(function(TA) { 17 // Make it interesting - use non-zero byteOffsets and non-zero indexes. 18 19 const view = new TA(sab, 32, 20); 20 const control = new TA(ab, 0, 2); 21 22 view[8] = 0; 23 assert.sameValue(Atomics.exchange(view, 8, 10), 0, 24 'Atomics.exchange(view, 8, 10) returns 0'); 25 assert.sameValue(view[8], 10, 'The value of view[8] is 10'); 26 27 assert.sameValue(Atomics.exchange(view, 8, -5), 10, 28 'Atomics.exchange(view, 8, -5) returns 10'); 29 control[0] = -5; 30 assert.sameValue(view[8], control[0], 'The value of view[8] equals the value of `control[0]` (-5)'); 31 32 view[3] = -5; 33 control[0] = -5; 34 assert.sameValue(Atomics.exchange(view, 3, 0), control[0], 35 'Atomics.exchange(view, 3, 0) returns the value of `control[0]` (-5)'); 36 37 control[0] = 12345; 38 view[3] = 12345; 39 assert.sameValue(Atomics.exchange(view, 3, 0), control[0], 40 'Atomics.exchange(view, 3, 0) returns the value of `control[0]` (12345)'); 41 42 control[0] = 123456789; 43 view[3] = 123456789; 44 assert.sameValue(Atomics.exchange(view, 3, 0), control[0], 45 'Atomics.exchange(view, 3, 0) returns the value of `control[0]` (123456789)'); 46 47 // In-bounds boundary cases for indexing 48 testWithAtomicsInBoundsIndices(function(IdxGen) { 49 let Idx = IdxGen(view); 50 view.fill(0); 51 // Atomics.store() computes an index from Idx in the same way as other 52 // Atomics operations, not quite like view[Idx]. 53 Atomics.store(view, Idx, 37); 54 assert.sameValue(Atomics.exchange(view, Idx, 0), 37, 'Atomics.exchange(view, Idx, 0) returns 37'); 55 }); 56 }, views); 57 58 reportCompare(0, 0);