1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
(function(global, utils) {
"use strict";
%CheckIsBootstrapping();
// -------------------------------------------------------------------
// Imports
var GlobalObject = global.Object;
var MaxSimple;
var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
utils.Import(function(from) {
MaxSimple = from.MaxSimple;
});
// -------------------------------------------------------------------
function CheckSharedIntegerTypedArray(ia) {
if (!%IsSharedIntegerTypedArray(ia)) {
throw %make_type_error(kNotIntegerSharedTypedArray, ia);
}
}
function CheckSharedInteger32TypedArray(ia) {
CheckSharedIntegerTypedArray(ia);
if (!%IsSharedInteger32TypedArray(ia)) {
throw %make_type_error(kNotInt32SharedTypedArray, ia);
}
}
// https://tc39.github.io/ecmascript_sharedmem/shmem.html#Atomics.ValidateAtomicAccess
function ValidateIndex(index, length) {
var numberIndex = TO_NUMBER(index);
var accessIndex = TO_INTEGER(numberIndex);
if (numberIndex !== accessIndex) {
throw %make_range_error(kInvalidAtomicAccessIndex);
}
if (accessIndex < 0 || accessIndex >= length) {
throw %make_range_error(kInvalidAtomicAccessIndex);
}
return accessIndex;
}
//-------------------------------------------------------------------
function AtomicsCompareExchangeJS(sta, index, oldValue, newValue) {
CheckSharedIntegerTypedArray(sta);
index = ValidateIndex(index, %_TypedArrayGetLength(sta));
oldValue = TO_NUMBER(oldValue);
newValue = TO_NUMBER(newValue);
return %_AtomicsCompareExchange(sta, index, oldValue, newValue);
}
function AtomicsAddJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = ValidateIndex(index, %_TypedArrayGetLength(ia));
value = TO_NUMBER(value);
return %_AtomicsAdd(ia, index, value);
}
function AtomicsSubJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = ValidateIndex(index, %_TypedArrayGetLength(ia));
value = TO_NUMBER(value);
return %_AtomicsSub(ia, index, value);
}
function AtomicsAndJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = ValidateIndex(index, %_TypedArrayGetLength(ia));
value = TO_NUMBER(value);
return %_AtomicsAnd(ia, index, value);
}
function AtomicsOrJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = ValidateIndex(index, %_TypedArrayGetLength(ia));
value = TO_NUMBER(value);
return %_AtomicsOr(ia, index, value);
}
function AtomicsXorJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = ValidateIndex(index, %_TypedArrayGetLength(ia));
value = TO_NUMBER(value);
return %_AtomicsXor(ia, index, value);
}
function AtomicsExchangeJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = ValidateIndex(index, %_TypedArrayGetLength(ia));
value = TO_NUMBER(value);
return %_AtomicsExchange(ia, index, value);
}
function AtomicsIsLockFreeJS(size) {
return %_AtomicsIsLockFree(size);
}
function AtomicsWaitJS(ia, index, value, timeout) {
CheckSharedInteger32TypedArray(ia);
index = ValidateIndex(index, %_TypedArrayGetLength(ia));
if (IS_UNDEFINED(timeout)) {
timeout = INFINITY;
} else {
timeout = TO_NUMBER(timeout);
if (NUMBER_IS_NAN(timeout)) {
timeout = INFINITY;
} else {
timeout = MaxSimple(0, timeout);
}
}
return %AtomicsWait(ia, index, value, timeout);
}
function AtomicsWakeJS(ia, index, count) {
CheckSharedInteger32TypedArray(ia);
index = ValidateIndex(index, %_TypedArrayGetLength(ia));
count = MaxSimple(0, TO_INTEGER(count));
return %AtomicsWake(ia, index, count);
}
// -------------------------------------------------------------------
var Atomics = global.Atomics;
// The Atomics global is defined by the bootstrapper.
%AddNamedProperty(Atomics, toStringTagSymbol, "Atomics", READ_ONLY | DONT_ENUM);
utils.InstallFunctions(Atomics, DONT_ENUM, [
// TODO(binji): remove the rest of the (non futex) Atomics functions as they
// become builtins.
"compareExchange", AtomicsCompareExchangeJS,
"add", AtomicsAddJS,
"sub", AtomicsSubJS,
"and", AtomicsAndJS,
"or", AtomicsOrJS,
"xor", AtomicsXorJS,
"exchange", AtomicsExchangeJS,
"isLockFree", AtomicsIsLockFreeJS,
"wait", AtomicsWaitJS,
"wake", AtomicsWakeJS,
]);
})