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 exchange = stdlib.Atomics.exchange;
16  var fround = stdlib.Math.fround;
17
18  function exchangei8(i, x) {
19    i = i | 0;
20    x = x | 0;
21    return exchange(MEM8, i, x)|0;
22  }
23
24  function exchangei16(i, x) {
25    i = i | 0;
26    x = x | 0;
27    return exchange(MEM16, i, x)|0;
28  }
29
30  function exchangei32(i, x) {
31    i = i | 0;
32    x = x | 0;
33    return exchange(MEM32, i, x)|0;
34  }
35
36  function exchangeu8(i, x) {
37    i = i | 0;
38    x = x >>> 0;
39    return exchange(MEMU8, i, x)>>>0;
40  }
41
42  function exchangeu16(i, x) {
43    i = i | 0;
44    x = x >>> 0;
45    return exchange(MEMU16, i, x)>>>0;
46  }
47
48  function exchangeu32(i, x) {
49    i = i | 0;
50    x = x >>> 0;
51    return exchange(MEMU32, i, x)>>>0;
52  }
53
54  return {
55    exchangei8: exchangei8,
56    exchangei16: exchangei16,
57    exchangei32: exchangei32,
58    exchangeu8: exchangeu8,
59    exchangeu16: exchangeu16,
60    exchangeu32: exchangeu32,
61  };
62}
63
64var sab = new SharedArrayBuffer(16);
65var m = Module(this, {}, sab);
66
67function clearArray() {
68  var ui8 = new Uint8Array(sab);
69  for (var i = 0; i < sab.byteLength; ++i) {
70    ui8[i] = 0;
71  }
72}
73
74function testElementType(taConstr, f, offset) {
75  clearArray();
76
77  var ta = new taConstr(sab, offset);
78  var name = Object.prototype.toString.call(ta);
79  ta[0] = 0x7f;
80  assertEquals(0x7f, f(0, 0xf), name);
81  assertEquals(0xf, ta[0]);
82  // out of bounds
83  assertThrows(function() { f(-1, 0); });
84  assertThrows(function() { f(ta.length, 0); });
85}
86
87function testElement(m, offset) {
88  testElementType(Int8Array, m.exchangei8, offset);
89  testElementType(Int16Array, m.exchangei16, offset);
90  testElementType(Int32Array, m.exchangei32, offset);
91  testElementType(Uint8Array, m.exchangeu8, offset);
92  testElementType(Uint16Array, m.exchangeu16, offset);
93  testElementType(Uint32Array, m.exchangeu32, offset);
94}
95
96var offset = 0;
97var sab = new SharedArrayBuffer(16);
98var m1 = Module(this, {}, sab, offset);
99testElement(m1, offset);
100
101offset = 32;
102sab = new SharedArrayBuffer(64);
103var m2 = Module(this, {}, sab, offset);
104testElement(m2, offset);
105