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1// Copyright 2015 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// Flags: --harmony-sharedarraybuffer
6
7function Module(stdlib, foreign, heap, offset) {
8  "use asm";
9  var MEM8 = new stdlib.Int8Array(heap, offset);
10  var MEM16 = new stdlib.Int16Array(heap, offset);
11  var MEM32 = new stdlib.Int32Array(heap, offset);
12  var MEMU8 = new stdlib.Uint8Array(heap, offset);
13  var MEMU16 = new stdlib.Uint16Array(heap, offset);
14  var MEMU32 = new stdlib.Uint32Array(heap, offset);
15  var compareExchange = stdlib.Atomics.compareExchange;
16  var fround = stdlib.Math.fround;
17
18  function compareExchangei8(i, o, n) {
19    i = i | 0;
20    o = o | 0;
21    n = n | 0;
22    return compareExchange(MEM8, i, o, n)|0;
23  }
24
25  function compareExchangei16(i, o, n) {
26    i = i | 0;
27    o = o | 0;
28    n = n | 0;
29    return compareExchange(MEM16, i, o, n)|0;
30  }
31
32  function compareExchangei32(i, o, n) {
33    i = i | 0;
34    o = o | 0;
35    n = n | 0;
36    return compareExchange(MEM32, i, o, n)|0;
37  }
38
39  function compareExchangeu8(i, o, n) {
40    i = i | 0;
41    o = o >>> 0;
42    n = n >>> 0;
43    return compareExchange(MEMU8, i, o, n)>>>0;
44  }
45
46  function compareExchangeu16(i, o, n) {
47    i = i | 0;
48    o = o >>> 0;
49    n = n >>> 0;
50    return compareExchange(MEMU16, i, o, n)>>>0;
51  }
52
53  function compareExchangeu32(i, o, n) {
54    i = i | 0;
55    o = o >>> 0;
56    n = n >>> 0;
57    return compareExchange(MEMU32, i, o, n)>>>0;
58  }
59
60  return {
61    compareExchangei8: compareExchangei8,
62    compareExchangei16: compareExchangei16,
63    compareExchangei32: compareExchangei32,
64    compareExchangeu8: compareExchangeu8,
65    compareExchangeu16: compareExchangeu16,
66    compareExchangeu32: compareExchangeu32,
67  };
68}
69
70function clearArray() {
71  var ui8 = new Uint8Array(sab);
72  for (var i = 0; i < sab.byteLength; ++i) {
73    ui8[i] = 0;
74  }
75}
76
77function testElementType(taConstr, f, oobValue, offset) {
78  clearArray();
79
80  var ta = new taConstr(sab, offset);
81  var name = Object.prototype.toString.call(ta);
82  assertEquals(0, ta[0]);
83  assertEquals(0, f(0, 0, 50), name);
84  assertEquals(50, ta[0]);
85  // Value is not equal to 0, so compareExchange won't store 100
86  assertEquals(50, f(0, 0, 100), name);
87  assertEquals(50, ta[0]);
88  // out of bounds
89  assertThrows(function() { f(-1, 0, 0); });
90  assertThrows(function() { f(ta.length, 0, 0); });
91}
92
93function testElement(m, offset) {
94  testElementType(Int8Array, m.compareExchangei8, 0, offset);
95  testElementType(Int16Array, m.compareExchangei16, 0, offset);
96  testElementType(Int32Array, m.compareExchangei32, 0, offset);
97  testElementType(Uint8Array, m.compareExchangeu8, 0, offset);
98  testElementType(Uint16Array, m.compareExchangeu16, 0, offset);
99  testElementType(Uint32Array, m.compareExchangeu32, 0, offset);
100}
101
102var offset = 0;
103var sab = new SharedArrayBuffer(16);
104var m1 = Module(this, {}, sab, offset);
105testElement(m1, offset);
106
107offset = 32;
108sab = new SharedArrayBuffer(64);
109var m2 = Module(this, {}, sab, offset);
110testElement(m2, offset);
111