-
Notifications
You must be signed in to change notification settings - Fork 52
/
index.ts
564 lines (535 loc) · 16.3 KB
/
index.ts
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
import * as RbAbi from "./bindgen/rb-abi-guest";
import {
addRbJsAbiHostToImports,
JsAbiResult,
JsAbiValue,
} from "./bindgen/rb-js-abi-host";
/**
* A Ruby VM instance
*
* @example
*
* const wasi = new WASI();
* const vm = new RubyVM();
* const imports = {
* wasi_snapshot_preview1: wasi.wasiImport,
* };
*
* vm.addToImports(imports);
*
* const instance = await WebAssembly.instantiate(rubyModule, imports);
* await vm.setInstance(instance);
* wasi.initialize(instance);
* vm.initialize();
*
*/
export class RubyVM {
guest: RbAbi.RbAbiGuest;
private instance: WebAssembly.Instance | null = null;
private transport: JsValueTransport;
private exceptionFormatter: RbExceptionFormatter;
constructor() {
this.guest = new RbAbi.RbAbiGuest();
this.transport = new JsValueTransport();
this.exceptionFormatter = new RbExceptionFormatter();
}
/**
* Initialize the Ruby VM with the given command line arguments
* @param args The command line arguments to pass to Ruby. Must be
* an array of strings starting with the Ruby program name.
*/
initialize(args: string[] = ["ruby.wasm", "--disable-gems", "-e_=0"]) {
const c_args = args.map((arg) => arg + "\0");
this.guest.rubyInit();
this.guest.rubySysinit(c_args);
this.guest.rubyOptions(c_args);
}
/**
* Set a given instance to interact JavaScript and Ruby's
* WebAssembly instance. This method must be called before calling
* Ruby API.
*
* @param instance The WebAssembly instance to interact with. Must
* be instantiated from a Ruby built with JS extension, and built
* with Reactor ABI instead of command line.
*/
async setInstance(instance: WebAssembly.Instance) {
this.instance = instance;
await this.guest.instantiate(instance);
}
/**
* Add intrinsic import entries, which is necessary to interact JavaScript
* and Ruby's WebAssembly instance.
* @param imports The import object to add to the WebAssembly instance
*/
addToImports(imports: WebAssembly.Imports) {
this.guest.addToImports(imports);
function wrapTry(f: (...args: any[]) => JsAbiValue): () => JsAbiResult {
return (...args) => {
try {
return { tag: "success", val: f(...args) };
} catch (e) {
return { tag: "failure", val: e };
}
};
}
addRbJsAbiHostToImports(
imports,
{
evalJs: wrapTry((code) => {
return Function(code)();
}),
isJs: (value) => {
// Just for compatibility with the old JS API
return true;
},
globalThis: () => {
if (typeof globalThis !== "undefined") {
return globalThis;
} else if (typeof global !== "undefined") {
return global;
} else if (typeof window !== "undefined") {
return window;
}
throw new Error("unable to locate global object");
},
intToJsNumber: (value) => {
return value;
},
stringToJsString: (value) => {
return value;
},
boolToJsBool: (value) => {
return value;
},
procToJsFunction: (rawRbAbiValue) => {
const rbValue = this.rbValueofPointer(rawRbAbiValue);
return (...args) => {
rbValue.call("call", ...args.map((arg) => this.wrap(arg)));
};
},
rbObjectToJsRbValue: (rawRbAbiValue) => {
return this.rbValueofPointer(rawRbAbiValue);
},
jsValueToString: (value) => {
// According to the [spec](https://tc39.es/ecma262/multipage/text-processing.html#sec-string-constructor-string-value)
// `String(value)` always returns a string.
return String(value);
},
jsValueToInteger(value) {
if (typeof value === "number") {
return { tag: "f64", val: value };
} else if (typeof value === "bigint") {
return { tag: "bignum", val: BigInt(value).toString(10) + "\0" };
} else if (typeof value === "string") {
return { tag: "bignum", val: value + "\0" };
} else if (typeof value === "undefined") {
return { tag: "f64", val: 0 };
} else {
return { tag: "f64", val: Number(value) };
}
},
exportJsValueToHost: (value) => {
// See `JsValueExporter` for the reason why we need to do this
this.transport.takeJsValue(value);
},
importJsValueFromHost: () => {
return this.transport.consumeJsValue();
},
instanceOf: (value, klass) => {
if (typeof klass === "function") {
return value instanceof klass;
} else {
return false;
}
},
jsValueTypeof(value) {
return typeof value;
},
jsValueEqual(lhs, rhs) {
return lhs == rhs;
},
jsValueStrictlyEqual(lhs, rhs) {
return lhs === rhs;
},
reflectApply: wrapTry((target, thisArgument, args) => {
return Reflect.apply(target as any, thisArgument, args);
}),
reflectConstruct: function (target, args) {
throw new Error("Function not implemented.");
},
reflectDeleteProperty: function (target, propertyKey): boolean {
throw new Error("Function not implemented.");
},
reflectGet: wrapTry((target, propertyKey) => {
return target[propertyKey];
}),
reflectGetOwnPropertyDescriptor: function (
target,
propertyKey: string
) {
throw new Error("Function not implemented.");
},
reflectGetPrototypeOf: function (target) {
throw new Error("Function not implemented.");
},
reflectHas: function (target, propertyKey): boolean {
throw new Error("Function not implemented.");
},
reflectIsExtensible: function (target): boolean {
throw new Error("Function not implemented.");
},
reflectOwnKeys: function (target) {
throw new Error("Function not implemented.");
},
reflectPreventExtensions: function (target): boolean {
throw new Error("Function not implemented.");
},
reflectSet: wrapTry((target, propertyKey, value) => {
return Reflect.set(target, propertyKey, value);
}),
reflectSetPrototypeOf: function (target, prototype): boolean {
throw new Error("Function not implemented.");
},
},
(name) => {
return this.instance.exports[name];
}
);
}
/**
* Print the Ruby version to stdout
*/
printVersion() {
this.guest.rubyShowVersion();
}
/**
* Runs a string of Ruby code from JavaScript
* @param code The Ruby code to run
* @returns the result of the last expression
*
* @example
* vm.eval("puts 'hello world'");
* const result = vm.eval("1 + 2");
* console.log(result.toString()); // 3
*
*/
eval(code: string): RbValue {
return evalRbCode(this, this.privateObject(), code);
}
/**
* Runs a string of Ruby code with top-level `JS::Object#await`
* Returns a promise that resolves when execution completes.
* @param code The Ruby code to run
* @returns a promise that resolves to the result of the last expression
*
* @example
* const text = await vm.evalAsync(`
* require 'js'
* response = JS.global.fetch('https://example.com').await
* response.text.await
* `);
* console.log(text.toString()); // <html>...</html>
*/
evalAsync(code: string): Promise<RbValue> {
const JS = this.eval("require 'js'; JS");
return new Promise((resolve, reject) => {
JS.call(
"__eval_async_rb",
this.wrap(code),
this.wrap({
resolve,
reject: (error: RbValue) => {
reject(
new RbError(
this.exceptionFormatter.format(
error,
this,
this.privateObject()
)
)
);
},
})
);
});
}
/**
* Wrap a JavaScript value into a Ruby JS::Object
* @param value The value to convert to RbValue
* @returns the RbValue object representing the given JS value
*
* @example
* const hash = vm.eval(`Hash.new`)
* hash.call("store", vm.eval(`"key1"`), vm.wrap(new Object()));
*/
wrap(value: any): RbValue {
return this.transport.importJsValue(value, this);
}
private privateObject(): RubyVMPrivate {
return {
transport: this.transport,
exceptionFormatter: this.exceptionFormatter,
};
}
private rbValueofPointer(pointer: number): RbValue {
const abiValue = new (RbAbi.RbAbiValue as any)(pointer, this.guest);
return new RbValue(abiValue, this, this.privateObject());
}
}
/**
* Export a JS value held by the Ruby VM to the JS environment.
* This is implemented in a dirty way since wit cannot reference resources
* defined in other interfaces.
* In our case, we can't express `function(v: rb-abi-value) -> js-abi-value`
* because `rb-js-abi-host.wit`, that defines `js-abi-value`, is implemented
* by embedder side (JS) but `rb-abi-guest.wit`, that defines `rb-abi-value`
* is implemented by guest side (Wasm).
*
* This class is a helper to export by:
* 1. Call `function __export_to_js(v: rb-abi-value)` defined in guest from embedder side.
* 2. Call `function takeJsValue(v: js-abi-value)` defined in embedder from guest side with
* underlying JS value of given `rb-abi-value`.
* 3. Then `takeJsValue` implementation escapes the given JS value to the `_takenJsValues`
* stored in embedder side.
* 4. Finally, embedder side can take `_takenJsValues`.
*
* Note that `exportJsValue` is not reentrant.
*
* @private
*/
class JsValueTransport {
private _takenJsValue: JsAbiValue = null;
takeJsValue(value: JsAbiValue) {
this._takenJsValue = value;
}
consumeJsValue(): JsAbiValue {
return this._takenJsValue;
}
exportJsValue(value: RbValue): JsAbiValue {
value.call("__export_to_js");
return this._takenJsValue;
}
importJsValue(value: JsAbiValue, vm: RubyVM): RbValue {
this._takenJsValue = value;
return vm.eval('require "js"; JS::Object').call("__import_from_js");
}
}
/**
* A RbValue is an object that represents a value in Ruby
*/
export class RbValue {
/**
* @hideconstructor
*/
constructor(
private inner: RbAbi.RbAbiValue,
private vm: RubyVM,
private privateObject: RubyVMPrivate
) {}
/**
* Call a given method with given arguments
*
* @param callee name of the Ruby method to call
* @param args arguments to pass to the method. Must be an array of RbValue
*
* @example
* const ary = vm.eval("[1, 2, 3]");
* ary.call("push", 4);
* console.log(ary.call("sample").toString());
*
*/
call(callee: string, ...args: RbValue[]): RbValue {
const innerArgs = args.map((arg) => arg.inner);
return new RbValue(
callRbMethod(this.vm, this.privateObject, this.inner, callee, innerArgs),
this.vm,
this.privateObject
);
}
/**
* @see {@link https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toPrimitive}
* @param hint Preferred type of the result primitive value. `"number"`, `"string"`, or `"default"`.
*/
[Symbol.toPrimitive](hint: string) {
if (hint === "string" || hint === "default") {
return this.toString();
} else if (hint === "number") {
return null;
}
return null;
}
/**
* Returns a string representation of the value by calling `to_s`
*/
toString(): string {
const rbString = callRbMethod(
this.vm,
this.privateObject,
this.inner,
"to_s",
[]
);
return this.vm.guest.rstringPtr(rbString);
}
/**
* Returns a JavaScript object representation of the value
* by calling `to_js`.
*
* Returns null if the value is not convertible to a JavaScript object.
*/
toJS(): any {
const JS = this.vm.eval("JS");
const jsValue = JS.call("try_convert", this);
if (jsValue.call("nil?").toString() === "true") {
return null;
}
return this.privateObject.transport.exportJsValue(jsValue);
}
}
enum ruby_tag_type {
None = 0x0,
Return = 0x1,
Break = 0x2,
Next = 0x3,
Retry = 0x4,
Redo = 0x5,
Raise = 0x6,
Throw = 0x7,
Fatal = 0x8,
Mask = 0xf,
}
type RubyVMPrivate = {
transport: JsValueTransport;
exceptionFormatter: RbExceptionFormatter;
};
class RbExceptionFormatter {
private literalsCache: [RbValue, RbValue, RbValue] | null = null;
format(error: RbValue, vm: RubyVM, privateObject: RubyVMPrivate): string {
const [zeroLiteral, oneLiteral, newLineLiteral] = (() => {
if (this.literalsCache == null) {
const zeroOneNewLine: [RbValue, RbValue, RbValue] = [
evalRbCode(vm, privateObject, "0"),
evalRbCode(vm, privateObject, "1"),
evalRbCode(vm, privateObject, `"\n"`),
];
this.literalsCache = zeroOneNewLine;
return zeroOneNewLine;
} else {
return this.literalsCache;
}
})();
const backtrace = error.call("backtrace");
if (backtrace.call("nil?").toString() === "true") {
return this.formatString(
error.call("class").toString(),
error.toString()
);
}
const firstLine = backtrace.call("at", zeroLiteral);
const restLines = backtrace
.call("drop", oneLiteral)
.call("join", newLineLiteral);
return this.formatString(error.call("class").toString(), error.toString(), [
firstLine.toString(),
restLines.toString(),
]);
}
formatString(
klass: string,
message: string,
backtrace?: [string, string]
): string {
if (backtrace) {
return `${backtrace[0]}: ${message} (${klass})\n${backtrace[1]}`;
} else {
return `${klass}: ${message}`;
}
}
}
const checkStatusTag = (
rawTag: number,
vm: RubyVM,
privateObject: RubyVMPrivate
) => {
switch (rawTag & ruby_tag_type.Mask) {
case ruby_tag_type.None:
break;
case ruby_tag_type.Return:
throw new RbError("unexpected return");
case ruby_tag_type.Next:
throw new RbError("unexpected next");
case ruby_tag_type.Break:
throw new RbError("unexpected break");
case ruby_tag_type.Redo:
throw new RbError("unexpected redo");
case ruby_tag_type.Retry:
throw new RbError("retry outside of rescue clause");
case ruby_tag_type.Throw:
throw new RbError("unexpected throw");
case ruby_tag_type.Raise:
case ruby_tag_type.Fatal:
const error = new RbValue(vm.guest.rbErrinfo(), vm, privateObject);
if (error.call("nil?").toString() === "true") {
throw new RbError("no exception object");
}
// clear errinfo if got exception due to no rb_jump_tag
vm.guest.rbClearErrinfo();
throw new RbError(
privateObject.exceptionFormatter.format(error, vm, privateObject)
);
default:
throw new RbError(`unknown error tag: ${rawTag}`);
}
};
function wrapRbOperation<R>(vm: RubyVM, body: () => R): R {
try {
return body();
} catch (e) {
if (e instanceof RbError) {
throw e;
}
// All JS exceptions triggered by Ruby code are translated to Ruby exceptions,
// so non-RbError exceptions are unexpected.
vm.guest.rbVmBugreport();
if (e instanceof WebAssembly.RuntimeError && e.message === "unreachable") {
const error = new RbError(`Something went wrong in Ruby VM: ${e}`);
error.stack = e.stack;
throw error;
} else {
throw e;
}
}
}
const callRbMethod = (
vm: RubyVM,
privateObject: RubyVMPrivate,
recv: RbAbi.RbAbiValue,
callee: string,
args: RbAbi.RbAbiValue[]
) => {
const mid = vm.guest.rbIntern(callee + "\0");
return wrapRbOperation(vm, () => {
const [value, status] = vm.guest.rbFuncallvProtect(recv, mid, args);
checkStatusTag(status, vm, privateObject);
return value;
});
};
const evalRbCode = (vm: RubyVM, privateObject: RubyVMPrivate, code: string) => {
return wrapRbOperation(vm, () => {
const [value, status] = vm.guest.rbEvalStringProtect(code + "\0");
checkStatusTag(status, vm, privateObject);
return new RbValue(value, vm, privateObject);
});
};
/**
* Error class thrown by Ruby execution
*/
export class RbError extends Error {
/**
* @hideconstructor
*/
constructor(message: string) {
super(message);
}
}