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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
'use strict';
const {
ArrayPrototypeForEach,
ArrayPrototypeMap,
ArrayPrototypePush,
FunctionPrototypeBind,
ObjectEntries,
String,
Symbol,
} = primordials;
const {
ERR_INVALID_ARG_VALUE,
ERR_WASI_ALREADY_STARTED,
} = require('internal/errors').codes;
const {
emitExperimentalWarning,
kEmptyObject,
} = require('internal/util');
const {
validateArray,
validateBoolean,
validateFunction,
validateInt32,
validateObject,
validateString,
validateUndefined,
} = require('internal/validators');
const kExitCode = Symbol('kExitCode');
const kSetMemory = Symbol('kSetMemory');
const kStarted = Symbol('kStarted');
const kInstance = Symbol('kInstance');
const kBindingName = Symbol('kBindingName');
emitExperimentalWarning('WASI');
function setupInstance(self, instance) {
validateObject(instance, 'instance');
validateObject(instance.exports, 'instance.exports');
self[kInstance] = instance;
self[kSetMemory](instance.exports.memory);
}
class WASI {
constructor(options = kEmptyObject) {
validateObject(options, 'options');
let _WASI;
validateString(options.version, 'options.version');
switch (options.version) {
case 'unstable':
({ WASI: _WASI } = internalBinding('wasi'));
this[kBindingName] = 'wasi_unstable';
break;
case 'preview1':
({ WASI: _WASI } = internalBinding('wasi'));
this[kBindingName] = 'wasi_snapshot_preview1';
break;
// When adding support for additional wasi versions add case here
default:
throw new ERR_INVALID_ARG_VALUE('options.version',
options.version,
'unsupported WASI version');
}
if (options.args !== undefined)
validateArray(options.args, 'options.args');
const args = ArrayPrototypeMap(options.args || [], String);
const env = [];
if (options.env !== undefined) {
validateObject(options.env, 'options.env');
ArrayPrototypeForEach(
ObjectEntries(options.env),
({ 0: key, 1: value }) => {
if (value !== undefined)
ArrayPrototypePush(env, `${key}=${value}`);
});
}
const preopens = [];
if (options.preopens !== undefined) {
validateObject(options.preopens, 'options.preopens');
ArrayPrototypeForEach(
ObjectEntries(options.preopens),
({ 0: key, 1: value }) =>
ArrayPrototypePush(preopens, String(key), String(value)),
);
}
const { stdin = 0, stdout = 1, stderr = 2 } = options;
validateInt32(stdin, 'options.stdin', 0);
validateInt32(stdout, 'options.stdout', 0);
validateInt32(stderr, 'options.stderr', 0);
const stdio = [stdin, stdout, stderr];
const wrap = new _WASI(args, env, preopens, stdio);
for (const prop in wrap) {
wrap[prop] = FunctionPrototypeBind(wrap[prop], wrap);
}
let returnOnExit = true;
if (options.returnOnExit !== undefined) {
validateBoolean(options.returnOnExit, 'options.returnOnExit');
returnOnExit = options.returnOnExit;
}
if (returnOnExit)
wrap.proc_exit = FunctionPrototypeBind(wasiReturnOnProcExit, this);
this[kSetMemory] = wrap._setMemory;
delete wrap._setMemory;
this.wasiImport = wrap;
this[kStarted] = false;
this[kExitCode] = 0;
this[kInstance] = undefined;
}
// Must not export _initialize, must export _start
start(instance) {
if (this[kStarted]) {
throw new ERR_WASI_ALREADY_STARTED();
}
this[kStarted] = true;
setupInstance(this, instance);
const { _start, _initialize } = this[kInstance].exports;
validateFunction(_start, 'instance.exports._start');
validateUndefined(_initialize, 'instance.exports._initialize');
try {
_start();
} catch (err) {
if (err !== kExitCode) {
throw err;
}
}
return this[kExitCode];
}
// Must not export _start, may optionally export _initialize
initialize(instance) {
if (this[kStarted]) {
throw new ERR_WASI_ALREADY_STARTED();
}
this[kStarted] = true;
setupInstance(this, instance);
const { _start, _initialize } = this[kInstance].exports;
validateUndefined(_start, 'instance.exports._start');
if (_initialize !== undefined) {
validateFunction(_initialize, 'instance.exports._initialize');
_initialize();
}
}
getImportObject() {
return { [this[kBindingName]]: this.wasiImport };
}
}
module.exports = { WASI };
function wasiReturnOnProcExit(rval) {
// If __wasi_proc_exit() does not terminate the process, an assertion is
// triggered in the wasm runtime. Node can sidestep the assertion and return
// an exit code by recording the exit code, and throwing a JavaScript
// exception that WebAssembly cannot catch.
this[kExitCode] = rval;
throw kExitCode;
}
|
