sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart - Issue 694353007: Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

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Issue 694353007: Move dart2js from sdk/lib/_internal/compiler to pkg/compiler (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart

Patch Set: Created 6 years, 1 month ago

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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file

2 // for details. All rights reserved. Use of this source code is governed by a

3 // BSD-style license that can be found in the LICENSE file.

4

5 part of dart2js.js_emitter;

6

7

8 class OldEmitter implements Emitter {

9 final Compiler compiler;

10 final CodeEmitterTask task;

11

12 final ContainerBuilder containerBuilder = new ContainerBuilder();

13 final ClassEmitter classEmitter = new ClassEmitter();

14 final NsmEmitter nsmEmitter = new NsmEmitter();

15 TypeTestEmitter get typeTestEmitter => task.typeTestEmitter;

16 final InterceptorEmitter interceptorEmitter = new InterceptorEmitter();

17 final MetadataEmitter metadataEmitter = new MetadataEmitter();

18

19 final Set<ConstantValue> cachedEmittedConstants;

20 final CodeBuffer cachedEmittedConstantsBuffer = new CodeBuffer();

21 final Map<Element, ClassBuilder> cachedClassBuilders;

22 final Set<Element> cachedElements;

23

24 bool needsDefineClass = false;

25 bool needsMixinSupport = false;

26 bool needsLazyInitializer = false;

27 final Namer namer;

28 ConstantEmitter constantEmitter;

29 NativeEmitter get nativeEmitter => task.nativeEmitter;

30

31 // The full code that is written to each hunk part-file.

32 Map<OutputUnit, CodeBuffer> outputBuffers = new Map<OutputUnit, CodeBuffer>();

33 final CodeBuffer deferredConstants = new CodeBuffer();

34

35 /** Shorter access to [isolatePropertiesName]. Both here in the code, as

36 well as in the generated code. */

37 String isolateProperties;

38 String classesCollector;

39 Set<ClassElement> get neededClasses => task.neededClasses;

40 Map<OutputUnit, List<ClassElement>> get outputClassLists

41 => task.outputClassLists;

42 Map<OutputUnit, List<ConstantValue>> get outputConstantLists

43 => task.outputConstantLists;

44 List<ClassElement> get nativeClasses => task.nativeClasses;

45 final Map<String, String> mangledFieldNames = <String, String>{};

46 final Map<String, String> mangledGlobalFieldNames = <String, String>{};

47 final Set<String> recordedMangledNames = new Set<String>();

48

49 final Map<ClassElement, Map<String, jsAst.Expression>> additionalProperties =

50 new Map<ClassElement, Map<String, jsAst.Expression>>();

51

52 List<TypedefElement> get typedefsNeededForReflection =>

53 task.typedefsNeededForReflection;

54

55 JavaScriptBackend get backend => compiler.backend;

56 TypeVariableHandler get typeVariableHandler => backend.typeVariableHandler;

57

58 String get _ => space;

59 String get space => compiler.enableMinification ? "" : " ";

60 String get n => compiler.enableMinification ? "" : "\n";

61 String get N => compiler.enableMinification ? "\n" : ";\n";

62

63 CodeBuffer getBuffer(OutputUnit outputUnit) {

64 return outputBuffers.putIfAbsent(outputUnit, () => new CodeBuffer());

65 }

66

67 CodeBuffer get mainBuffer {

68 return getBuffer(compiler.deferredLoadTask.mainOutputUnit);

69 }

70

71 /**

72 * List of expressions and statements that will be included in the

73 * precompiled function.

74 *

75 * To save space, dart2js normally generates constructors and accessors

76 * dynamically. This doesn't work in CSP mode, and may impact startup time

77 * negatively. So dart2js will emit these functions to a separate file that

78 * can be optionally included to support CSP mode or for faster startup.

79 */

80 Map<OutputUnit, List<jsAst.Node>> _cspPrecompiledFunctions =

81 new Map<OutputUnit, List<jsAst.Node>>();

82

83 Map<OutputUnit, List<jsAst.Expression>> _cspPrecompiledConstructorNames =

84 new Map<OutputUnit, List<jsAst.Expression>>();

85

86 /**

87 * Accumulate properties for classes and libraries, describing their

88 * static/top-level members.

89 * Later, these members are emitted when the class or library is emitted.

90 *

91 * See [getElementDescriptor].

92 */

93 // TODO(ahe): Generate statics with their class, and store only libraries in

94 // this map.

95 final Map<Element, ClassBuilder> elementDescriptors =

96 new Map<Element, ClassBuilder>();

97

98 final bool generateSourceMap;

99

100 OldEmitter(Compiler compiler, Namer namer, this.generateSourceMap, this.task)

101 : this.compiler = compiler,

102 this.namer = namer,

103 cachedEmittedConstants = compiler.cacheStrategy.newSet(),

104 cachedClassBuilders = compiler.cacheStrategy.newMap(),

105 cachedElements = compiler.cacheStrategy.newSet() {

106 constantEmitter =

107 new ConstantEmitter(compiler, namer, makeConstantListTemplate);

108 containerBuilder.emitter = this;

109 classEmitter.emitter = this;

110 nsmEmitter.emitter = this;

111 interceptorEmitter.emitter = this;

112 metadataEmitter.emitter = this;

113 }

114

115 List<jsAst.Node> cspPrecompiledFunctionFor(OutputUnit outputUnit) {

116 return _cspPrecompiledFunctions.putIfAbsent(

117 outputUnit,

118 () => new List<jsAst.Node>());

119 }

120

121 List<jsAst.Expression> cspPrecompiledConstructorNamesFor(

122 OutputUnit outputUnit) {

123 return _cspPrecompiledConstructorNames.putIfAbsent(

124 outputUnit,

125 () => new List<jsAst.Expression>());

126 }

127

128 /// Erases the precompiled information for csp mode for all output units.

129 /// Used by the incremental compiler.

130 void clearCspPrecompiledNodes() {

131 _cspPrecompiledFunctions.clear();

132 _cspPrecompiledConstructorNames.clear();

133 }

134

135 void addComment(String comment, CodeBuffer buffer) {

136 buffer.write(jsAst.prettyPrint(js.comment(comment), compiler));

137 }

138

139 jsAst.Expression constantReference(ConstantValue value) {

140 return constantEmitter.reference(value);

141 }

142

143 jsAst.Expression constantInitializerExpression(ConstantValue value) {

144 return constantEmitter.initializationExpression(value);

145 }

146

147 String get name => 'CodeEmitter';

148

149 String get currentGenerateAccessorName

150 => '${namer.currentIsolate}.\$generateAccessor';

151 String get generateAccessorHolder

152 => '$isolatePropertiesName.\$generateAccessor';

153 String get finishClassesProperty

154 => r'$finishClasses';

155 String get finishClassesName

156 => '${namer.isolateName}.$finishClassesProperty';

157 String get finishIsolateConstructorName

158 => '${namer.isolateName}.\$finishIsolateConstructor';

159 String get isolatePropertiesName

160 => '${namer.isolateName}.${namer.isolatePropertiesName}';

161 String get lazyInitializerName

162 => '${namer.isolateName}.\$lazy';

163 String get initName => 'init';

164 String get makeConstListProperty

165 => namer.getMappedInstanceName('makeConstantList');

166

167 /// For deferred loading we communicate the initializers via this global var.

168 final String deferredInitializers = r"$dart_deferred_initializers";

169

170 /// All the global state can be passed around with this variable.

171 String get globalsHolder => namer.getMappedGlobalName("globalsHolder");

172

173 jsAst.Expression generateEmbeddedGlobalAccess(String global) {

174 return js(generateEmbeddedGlobalAccessString(global));

175 }

176

177 String generateEmbeddedGlobalAccessString(String global) {

178 // TODO(floitsch): don't use 'init' as global embedder storage.

179 return '$initName.$global';

180 }

181

182 jsAst.FunctionDeclaration get generateAccessorFunction {

183 const RANGE1_SIZE = RANGE1_LAST - RANGE1_FIRST + 1;

184 const RANGE2_SIZE = RANGE2_LAST - RANGE2_FIRST + 1;

185 const RANGE1_ADJUST = - (FIRST_FIELD_CODE - RANGE1_FIRST);

186 const RANGE2_ADJUST = - (FIRST_FIELD_CODE + RANGE1_SIZE - RANGE2_FIRST);

187 const RANGE3_ADJUST =

188 - (FIRST_FIELD_CODE + RANGE1_SIZE + RANGE2_SIZE - RANGE3_FIRST);

189

190 String receiverParamName = compiler.enableMinification ? "r" : "receiver";

191 String valueParamName = compiler.enableMinification ? "v" : "value";

192 String reflectableField = namer.reflectableField;

193

194 return js.statement('''

195 function generateAccessor(fieldDescriptor, accessors, cls) {

196 var fieldInformation = fieldDescriptor.split("-");

197 var field = fieldInformation[0];

198 var len = field.length;

199 var code = field.charCodeAt(len - 1);

200 var reflectable;

201 if (fieldInformation.length > 1) reflectable = true;

202 else reflectable = false;

203 code = ((code >= $RANGE1_FIRST) && (code <= $RANGE1_LAST))

204 ? code - $RANGE1_ADJUST

205 : ((code >= $RANGE2_FIRST) && (code <= $RANGE2_LAST))

206 ? code - $RANGE2_ADJUST

207 : ((code >= $RANGE3_FIRST) && (code <= $RANGE3_LAST))

208 ? code - $RANGE3_ADJUST

209 : $NO_FIELD_CODE;

210

211 if (code) { // needsAccessor

212 var getterCode = code & 3;

213 var setterCode = code >> 2;

214 var accessorName = field = field.substring(0, len - 1);

215

216 var divider = field.indexOf(":");

217 if (divider > 0) { // Colon never in first position.

218 accessorName = field.substring(0, divider);

219 field = field.substring(divider + 1);

220 }

221

222 if (getterCode) { // needsGetter

223 var args = (getterCode & 2) ? "$receiverParamName" : "";

224 var receiver = (getterCode & 1) ? "this" : "$receiverParamName";

225 var body = "return " + receiver + "." + field;

226 var property =

227 cls + ".prototype.${namer.getterPrefix}" + accessorName + "=";

228 var fn = "function(" + args + "){" + body + "}";

229 if (reflectable)

230 accessors.push(property + "\$reflectable(" + fn + ");\\n");

231 else

232 accessors.push(property + fn + ";\\n");

233 }

234

235 if (setterCode) { // needsSetter

236 var args = (setterCode & 2)

237 ? "$receiverParamName,${_}$valueParamName"

238 : "$valueParamName";

239 var receiver = (setterCode & 1) ? "this" : "$receiverParamName";

240 var body = receiver + "." + field + "$_=$_$valueParamName";

241 var property =

242 cls + ".prototype.${namer.setterPrefix}" + accessorName + "=";

243 var fn = "function(" + args + "){" + body + "}";

244 if (reflectable)

245 accessors.push(property + "\$reflectable(" + fn + ");\\n");

246 else

247 accessors.push(property + fn + ";\\n");

248 }

249 }

250

251 return field;

252 }''');

253 }

254

255 List get defineClassFunction {

256 // First the class name, then the field names in an array and the members

257 // (inside an Object literal).

258 // The caller can also pass in the constructor as a function if needed.

259 //

260 // Example:

261 // defineClass("A", ["x", "y"], {

262 // foo$1: function(y) {

263 // print(this.x + y);

264 // },

265 // bar$2: function(t, v) {

266 // this.x = t - v;

267 // },

268 // });

269

270 var defineClass = js('''function(name, cls, fields) {

271 var accessors = [];

272

273 var str = "function " + cls + "(";

274 var body = "";

275

276 for (var i = 0; i < fields.length; i++) {

277 if(i != 0) str += ", ";

278

279 var field = generateAccessor(fields[i], accessors, cls);

280 var parameter = "parameter_" + field;

281 str += parameter;

282 body += ("this." + field + " = " + parameter + ";\\n");

283 }

284 str += ") {\\n" + body + "}\\n";

285 str += cls + ".builtin\$cls=\\"" + name + "\\";\\n";

286 str += "\$desc=\$collectedClasses." + cls + ";\\n";

287 str += "if(\$desc instanceof Array) \$desc = \$desc[1];\\n";

288 str += cls + ".prototype = \$desc;\\n";

289 if (typeof defineClass.name != "string") {

290 str += cls + ".name=\\"" + cls + "\\";\\n";

291 }

292 str += accessors.join("");

293

294 return str;

295 }''');

296 // Declare a function called "generateAccessor". This is used in

297 // defineClassFunction (it's a local declaration in init()).

298 return [

299 generateAccessorFunction,

300 js('$generateAccessorHolder = generateAccessor'),

301 new jsAst.FunctionDeclaration(

302 new jsAst.VariableDeclaration('defineClass'), defineClass) ];

303 }

304

305 /** Needs defineClass to be defined. */

306 List buildInheritFrom() {

307 return [js(r'''

308 var inheritFrom = function() {

309 function tmp() {}

310 var hasOwnProperty = Object.prototype.hasOwnProperty;

311 return function (constructor, superConstructor) {

312 tmp.prototype = superConstructor.prototype;

313 var object = new tmp();

314 var properties = constructor.prototype;

315 for (var member in properties)

316 if (hasOwnProperty.call(properties, member))

317 object[member] = properties[member];

318 object.constructor = constructor;

319 constructor.prototype = object;

320 return object;

321 };

322 }()

323 ''')];

324 }

325

326 jsAst.Fun get finishClassesFunction {

327 // Class descriptions are collected in a JS object.

328 // 'finishClasses' takes all collected descriptions and sets up

329 // the prototype.

330 // Once set up, the constructors prototype field satisfy:

331 // - it contains all (local) members.

332 // - its internal prototype (__proto__) points to the superclass'

333 // prototype field.

334 // - the prototype's constructor field points to the JavaScript

335 // constructor.

336 // For engines where we have access to the '__proto__' we can manipulate

337 // the object literal directly. For other engines we have to create a new

338 // object and copy over the members.

339

340 String reflectableField = namer.reflectableField;

341 jsAst.Expression allClassesAccess =

342 generateEmbeddedGlobalAccess(embeddedNames.ALL_CLASSES);

343 jsAst.Expression metadataAccess =

344 generateEmbeddedGlobalAccess(embeddedNames.METADATA);

345 jsAst.Expression interceptorsByTagAccess =

346 generateEmbeddedGlobalAccess(embeddedNames.INTERCEPTORS_BY_TAG);

347 jsAst.Expression leafTagsAccess =

348 generateEmbeddedGlobalAccess(embeddedNames.LEAF_TAGS);

349

350 return js('''

351 function(collectedClasses, isolateProperties, existingIsolateProperties) {

352 var pendingClasses = Object.create(null);

353 if (!#) # = Object.create(null); // embedded allClasses.

354 var allClasses = #; // embedded allClasses;

355

356 if (#) // DEBUG_FAST_OBJECTS

357 print("Number of classes: " +

358 Object.getOwnPropertyNames(\$\$).length);

359

360 var hasOwnProperty = Object.prototype.hasOwnProperty;

361

362 if (typeof dart_precompiled == "function") {

363 var constructors = dart_precompiled(collectedClasses);

364 } else {

365 var combinedConstructorFunction =

366 "function \$reflectable(fn){fn.$reflectableField=1;return fn};\\n"+

367 "var \$desc;\\n";

368 var constructorsList = [];

369 }

370

371 for (var cls in collectedClasses) {

372 var desc = collectedClasses[cls];

373 if (desc instanceof Array) desc = desc[1];

374

375 /* The 'fields' are either a constructor function or a

376 * string encoding fields, constructor and superclass. Get

377 * the superclass and the fields in the format

378 * '[name/]Super;field1,field2'

379 * from the CLASS_DESCRIPTOR_PROPERTY property on the descriptor.

380 * The 'name/' is optional and contains the name that should be used

381 * when printing the runtime type string. It is used, for example,

382 * to print the runtime type JSInt as 'int'.

383 */

384 var classData = desc["${namer.classDescriptorProperty}"],

385 supr, name = cls, fields = classData;

386 if (#) // backend.hasRetainedMetadata

387 if (typeof classData == "object" &&

388 classData instanceof Array) {

389 classData = fields = classData[0];

390 }

391 if (typeof classData == "string") {

392 var split = classData.split("/");

393 if (split.length == 2) {

394 name = split[0];

395 fields = split[1];

396 }

397 }

398

399 var s = fields.split(";");

400 fields = s[1] == "" ? [] : s[1].split(",");

401 supr = s[0];

402 split = supr.split(":");

403 if (split.length == 2) {

404 supr = split[0];

405 var functionSignature = split[1];

406 if (functionSignature)

407 desc.\$signature = (function(s) {

408 return function(){ return #[s]; }; // embedded metadata.

409 })(functionSignature);

410 }

411

412 if (#) // needsMixinSupport

413 if (supr && supr.indexOf("+") > 0) {

414 s = supr.split("+");

415 supr = s[0];

416 var mixin = collectedClasses[s[1]];

417 if (mixin instanceof Array) mixin = mixin[1];

418 for (var d in mixin) {

419 if (hasOwnProperty.call(mixin, d) &&

420 !hasOwnProperty.call(desc, d))

421 desc[d] = mixin[d];

422 }

423 }

424

425 if (typeof dart_precompiled != "function") {

426 combinedConstructorFunction += defineClass(name, cls, fields);

427 constructorsList.push(cls);

428 }

429 if (supr) pendingClasses[cls] = supr;

430 }

431

432 if (typeof dart_precompiled != "function") {

433 combinedConstructorFunction +=

434 "return [\\n " + constructorsList.join(",\\n ") + "\\n]";

435 var constructors =

436 new Function("\$collectedClasses", combinedConstructorFunction)

437 (collectedClasses);

438 combinedConstructorFunction = null;

439 }

440

441 for (var i = 0; i < constructors.length; i++) {

442 var constructor = constructors[i];

443 var cls = constructor.name;

444 var desc = collectedClasses[cls];

445 var globalObject = isolateProperties;

446 if (desc instanceof Array) {

447 globalObject = desc[0] \|\| isolateProperties;

448 desc = desc[1];

449 }

450 if (#) //backend.isTreeShakingDisabled,

451 constructor["${namer.metadataField}"] = desc;

452 allClasses[cls] = constructor;

453 globalObject[cls] = constructor;

454 }

455

456 constructors = null;

457

458 var finishedClasses = Object.create(null);

459 # = Object.create(null); // embedded interceptorsByTag.

460 # = Object.create(null); // embedded leafTags.

461

462 #; // buildFinishClass(),

463

464 #; // buildTrivialNsmHandlers()

465

466 for (var cls in pendingClasses) finishClass(cls);

467 }''', [

468 allClassesAccess, allClassesAccess,

469 allClassesAccess,

470 DEBUG_FAST_OBJECTS,

471 backend.hasRetainedMetadata,

472 metadataAccess,

473 needsMixinSupport,

474 backend.isTreeShakingDisabled,

475 interceptorsByTagAccess,

476 leafTagsAccess,

477 buildFinishClass(),

478 nsmEmitter.buildTrivialNsmHandlers()]);

479 }

480

481 jsAst.Node optional(bool condition, jsAst.Node node) {

482 return condition ? node : new jsAst.EmptyStatement();

483 }

484

485 jsAst.FunctionDeclaration buildFinishClass() {

486 String specProperty = '"${namer.nativeSpecProperty}"'; // "%"

487

488 jsAst.Expression interceptorsByTagAccess =

489 generateEmbeddedGlobalAccess(embeddedNames.INTERCEPTORS_BY_TAG);

490 jsAst.Expression leafTagsAccess =

491 generateEmbeddedGlobalAccess(embeddedNames.LEAF_TAGS);

492

493 return js.statement('''

494 function finishClass(cls) {

495

496 if (finishedClasses[cls]) return;

497 finishedClasses[cls] = true;

498

499 var superclass = pendingClasses[cls];

500

501 // The superclass is only false (empty string) for the Dart Object

502 // class. The minifier together with noSuchMethod can put methods on

503 // the Object.prototype object, and they show through here, so we check

504 // that we have a string.

505 if (!superclass \|\| typeof superclass != "string") return;

506 finishClass(superclass);

507 var constructor = allClasses[cls];

508 var superConstructor = allClasses[superclass];

509

510 if (!superConstructor)

511 superConstructor = existingIsolateProperties[superclass];

512

513 var prototype = inheritFrom(constructor, superConstructor);

514

515 if (#) { // !nativeClasses.isEmpty,

516 // The property looks like this:

517 //

518 // HtmlElement: {

519 // "%": "HTMLDivElement\|HTMLAnchorElement;HTMLElement;FancyButton"

520 //

521 // The first two semicolon-separated parts contain dispatch tags, the

522 // third contains the JavaScript names for classes.

523 //

524 // The tags indicate that JavaScript objects with the dispatch tags

525 // (usually constructor names) HTMLDivElement, HTMLAnchorElement and

526 // HTMLElement all map to the Dart native class named HtmlElement.

527 // The first set is for effective leaf nodes in the hierarchy, the

528 // second set is non-leaf nodes.

529 //

530 // The third part contains the JavaScript names of Dart classes that

531 // extend the native class. Here, FancyButton extends HtmlElement, so

532 // the runtime needs to know that window.HTMLElement.prototype is the

533 // prototype that needs to be extended in creating the custom element.

534 //

535 // The information is used to build tables referenced by

536 // getNativeInterceptor and custom element support.

537 if (Object.prototype.hasOwnProperty.call(prototype, $specProperty)) {

538 var nativeSpec = prototype[$specProperty].split(";");

539 if (nativeSpec[0]) {

540 var tags = nativeSpec[0].split("\|");

541 for (var i = 0; i < tags.length; i++) {

542 #[tags[i]] = constructor; // embedded interceptorsByTag.

543 #[tags[i]] = true; // embedded leafTags.

544 }

545 }

546 if (nativeSpec[1]) {

547 tags = nativeSpec[1].split("\|");

548 if (#) { // User subclassing of native classes?

549 if (nativeSpec[2]) {

550 var subclasses = nativeSpec[2].split("\|");

551 for (var i = 0; i < subclasses.length; i++) {

552 var subclass = allClasses[subclasses[i]];

553 subclass.\$nativeSuperclassTag = tags[0];

554 }

555 }

556 for (i = 0; i < tags.length; i++) {

557 #[tags[i]] = constructor; // embedded interceptorsByTag.

558 #[tags[i]] = false; // embedded leafTags.

559 }

560 }

561 }

562 }

563 }

564 }''', [!nativeClasses.isEmpty,

565 interceptorsByTagAccess,

566 leafTagsAccess,

567 true,

568 interceptorsByTagAccess,

569 leafTagsAccess]);

570 }

571

572 jsAst.Fun get finishIsolateConstructorFunction {

573 // We replace the old Isolate function with a new one that initializes

574 // all its fields with the initial (and often final) value of all globals.

575 //

576 // We also copy over old values like the prototype, and the

577 // isolateProperties themselves.

578 return js('''

579 function (oldIsolate) {

580 var isolateProperties = oldIsolate.#; // isolatePropertiesName

581 function Isolate() {

582 var hasOwnProperty = Object.prototype.hasOwnProperty;

583 for (var staticName in isolateProperties)

584 if (hasOwnProperty.call(isolateProperties, staticName))

585 this[staticName] = isolateProperties[staticName];

586

587 // Reset lazy initializers to null.

588 // When forcing the object to fast mode (below) v8 will consider

589 // functions as part the object's map. Since we will change them

590 // (after the first call to the getter), we would have a map

591 // transition.

592 var lazies = init.lazies;

593 for (var lazyInit in lazies) {

594 this[lazies[lazyInit]] = null;

595 }

596

597 // Use the newly created object as prototype. In Chrome,

598 // this creates a hidden class for the object and makes

599 // sure it is fast to access.

600 function ForceEfficientMap() {}

601 ForceEfficientMap.prototype = this;

602 new ForceEfficientMap();

603

604 // Now, after being a fast map we can set the lazies again.

605 for (var lazyInit in lazies) {

606 var lazyInitName = lazies[lazyInit];

607 this[lazyInitName] = isolateProperties[lazyInitName];

608 }

609 }

610 Isolate.prototype = oldIsolate.prototype;

611 Isolate.prototype.constructor = Isolate;

612 Isolate.# = isolateProperties; // isolatePropertiesName

613 if (#) // needsDefineClass.

614 Isolate.# = oldIsolate.#; // finishClassesProperty * 2

615 if (#) // outputContainsConstantList

616 Isolate.# = oldIsolate.#; // makeConstListProperty * 2

617 return Isolate;

618 }''',

619 [namer.isolatePropertiesName, namer.isolatePropertiesName,

620 needsDefineClass, finishClassesProperty, finishClassesProperty,

621 task.outputContainsConstantList,

622 makeConstListProperty, makeConstListProperty ]);

623 }

624

625 jsAst.Fun get lazyInitializerFunction {

626 String isolate = namer.currentIsolate;

627 jsAst.Expression cyclicThrow =

628 namer.elementAccess(backend.getCyclicThrowHelper());

629 jsAst.Expression laziesAccess =

630 generateEmbeddedGlobalAccess(embeddedNames.LAZIES);

631

632 return js('''

633 function (prototype, staticName, fieldName, getterName, lazyValue) {

634 if (!#) # = Object.create(null);

635 #[fieldName] = getterName;

636

637 var sentinelUndefined = {};

638 var sentinelInProgress = {};

639 prototype[fieldName] = sentinelUndefined;

640

641 prototype[getterName] = function () {

642 var result = $isolate[fieldName];

643 try {

644 if (result === sentinelUndefined) {

645 $isolate[fieldName] = sentinelInProgress;

646

647 try {

648 result = $isolate[fieldName] = lazyValue();

649 } finally {

650 // Use try-finally, not try-catch/throw as it destroys the

651 // stack trace.

652 if (result === sentinelUndefined)

653 $isolate[fieldName] = null;

654 }

655 } else {

656 if (result === sentinelInProgress)

657 #(staticName);

658 }

659

660 return result;

661 } finally {

662 $isolate[getterName] = function() { return this[fieldName]; };

663 }

664 }

665 }

666 ''', [laziesAccess, laziesAccess,

667 laziesAccess,

668 cyclicThrow]);

669 }

670

671 List buildDefineClassAndFinishClassFunctionsIfNecessary() {

672 if (!needsDefineClass) return [];

673 return defineClassFunction

674 ..addAll(buildInheritFrom())

675 ..addAll([

676 js('$finishClassesName = #', finishClassesFunction)

677 ]);

678 }

679

680 List buildLazyInitializerFunctionIfNecessary() {

681 if (!needsLazyInitializer) return [];

682

683 return [js('# = #', [js(lazyInitializerName), lazyInitializerFunction])];

684 }

685

686 List buildFinishIsolateConstructor() {

687 return [

688 js('$finishIsolateConstructorName = #', finishIsolateConstructorFunction)

689 ];

690 }

691

692 void emitFinishIsolateConstructorInvocation(CodeBuffer buffer) {

693 String isolate = namer.isolateName;

694 buffer.write("$isolate = $finishIsolateConstructorName($isolate)$N");

695 }

696

697 /// In minified mode we want to keep the name for the most common core types.

698 bool _isNativeTypeNeedingReflectionName(Element element) {

699 if (!element.isClass) return false;

700 return (element == compiler.intClass \|\|

701 element == compiler.doubleClass \|\|

702 element == compiler.numClass \|\|

703 element == compiler.stringClass \|\|

704 element == compiler.boolClass \|\|

705 element == compiler.nullClass \|\|

706 element == compiler.listClass);

707 }

708

709 /// Returns the "reflection name" of an [Element] or [Selector].

710 /// The reflection name of a getter 'foo' is 'foo'.

711 /// The reflection name of a setter 'foo' is 'foo='.

712 /// The reflection name of a method 'foo' is 'foo:N:M:O', where N is the

713 /// number of required arguments, M is the number of optional arguments, and

714 /// O is the named arguments.

715 /// The reflection name of a constructor is similar to a regular method but

716 /// starts with 'new '.

717 /// The reflection name of class 'C' is 'C'.

718 /// An anonymous mixin application has no reflection name.

719 /// This is used by js_mirrors.dart.

720 String getReflectionName(elementOrSelector, String mangledName) {

721 String name = elementOrSelector.name;

722 if (backend.shouldRetainName(name) \|\|

723 elementOrSelector is Element &&

724 // Make sure to retain names of unnamed constructors, and

725 // for common native types.

726 ((name == '' &&

727 backend.isAccessibleByReflection(elementOrSelector)) \|\|

728 _isNativeTypeNeedingReflectionName(elementOrSelector))) {

729

730 // TODO(ahe): Enable the next line when I can tell the difference between

731 // an instance method and a global. They may have the same mangled name.

732 // if (recordedMangledNames.contains(mangledName)) return null;

733 recordedMangledNames.add(mangledName);

734 return getReflectionNameInternal(elementOrSelector, mangledName);

735 }

736 return null;

737 }

738

739 String getReflectionNameInternal(elementOrSelector, String mangledName) {

740 String name =

741 namer.privateName(elementOrSelector.library, elementOrSelector.name);

742 if (elementOrSelector.isGetter) return name;

743 if (elementOrSelector.isSetter) {

744 if (!mangledName.startsWith(namer.setterPrefix)) return '$name=';

745 String base = mangledName.substring(namer.setterPrefix.length);

746 String getter = '${namer.getterPrefix}$base';

747 mangledFieldNames.putIfAbsent(getter, () => name);

748 assert(mangledFieldNames[getter] == name);

749 recordedMangledNames.add(getter);

750 // TODO(karlklose,ahe): we do not actually need to store information

751 // about the name of this setter in the output, but it is needed for

752 // marking the function as invokable by reflection.

753 return '$name=';

754 }

755 if (elementOrSelector is Element && elementOrSelector.isClosure) {

756 // Closures are synthesized and their name might conflict with existing

757 // globals. Assign an illegal name, and make sure they don't clash

758 // with each other.

759 return " $mangledName";

760 }

761 if (elementOrSelector is Selector

762 \|\| elementOrSelector.isFunction

763 \|\| elementOrSelector.isConstructor) {

764 int requiredParameterCount;

765 int optionalParameterCount;

766 String namedArguments = '';

767 bool isConstructor = false;

768 if (elementOrSelector is Selector) {

769 Selector selector = elementOrSelector;

770 requiredParameterCount = selector.argumentCount;

771 optionalParameterCount = 0;

772 namedArguments = namedParametersAsReflectionNames(selector);

773 } else {

774 FunctionElement function = elementOrSelector;

775 if (function.isConstructor) {

776 isConstructor = true;

777 name = Elements.reconstructConstructorName(function);

778 }

779 FunctionSignature signature = function.functionSignature;

780 requiredParameterCount = signature.requiredParameterCount;

781 optionalParameterCount = signature.optionalParameterCount;

782 if (signature.optionalParametersAreNamed) {

783 var names = [];

784 for (Element e in signature.optionalParameters) {

785 names.add(e.name);

786 }

787 Selector selector = new Selector.call(

788 function.name,

789 function.library,

790 requiredParameterCount,

791 names);

792 namedArguments = namedParametersAsReflectionNames(selector);

793 } else {

794 // Named parameters are handled differently by mirrors. For unnamed

795 // parameters, they are actually required if invoked

796 // reflectively. Also, if you have a method c(x) and c([x]) they both

797 // get the same mangled name, so they must have the same reflection

798 // name.

799 requiredParameterCount += optionalParameterCount;

800 optionalParameterCount = 0;

801 }

802 }

803 String suffix =

804 // TODO(ahe): We probably don't need optionalParameterCount in the

805 // reflection name.

806 '$name:$requiredParameterCount:$optionalParameterCount'

807 '$namedArguments';

808 return (isConstructor) ? 'new $suffix' : suffix;

809 }

810 Element element = elementOrSelector;

811 if (element.isGenerativeConstructorBody) {

812 return null;

813 } else if (element.isClass) {

814 ClassElement cls = element;

815 if (cls.isUnnamedMixinApplication) return null;

816 return cls.name;

817 } else if (element.isTypedef) {

818 return element.name;

819 }

820 throw compiler.internalError(element,

821 'Do not know how to reflect on this $element.');

822 }

823

824 String namedParametersAsReflectionNames(Selector selector) {

825 if (selector.getOrderedNamedArguments().isEmpty) return '';

826 String names = selector.getOrderedNamedArguments().join(':');

827 return ':$names';

828 }

829

830 jsAst.FunctionDeclaration buildCspPrecompiledFunctionFor(

831 OutputUnit outputUnit) {

832 // TODO(ahe): Compute a hash code.

833 return js.statement('''

834 function dart_precompiled(\$collectedClasses) {

835 var \$desc;

836 #;

837 return #;

838 }''',

839 [cspPrecompiledFunctionFor(outputUnit),

840 new jsAst.ArrayInitializer.from(

841 cspPrecompiledConstructorNamesFor(outputUnit))]);

842 }

843

844 void generateClass(ClassElement classElement, ClassBuilder properties) {

845 compiler.withCurrentElement(classElement, () {

846 if (compiler.hasIncrementalSupport) {

847 ClassBuilder builder =

848 cachedClassBuilders.putIfAbsent(classElement, () {

849 ClassBuilder builder = new ClassBuilder(classElement, namer);

850 classEmitter.generateClass(

851 classElement, builder, additionalProperties[classElement]);

852 return builder;

853 });

854 invariant(classElement, builder.fields.isEmpty);

855 invariant(classElement, builder.superName == null);

856 invariant(classElement, builder.functionType == null);

857 invariant(classElement, builder.fieldMetadata == null);

858 properties.properties.addAll(builder.properties);

859 } else {

860 classEmitter.generateClass(

861 classElement, properties, additionalProperties[classElement]);

862 }

863 });

864 }

865

866 void emitFinishClassesInvocationIfNecessary(CodeBuffer buffer) {

867 if (needsDefineClass) {

868 buffer.write('$finishClassesName($classesCollector,'

869 '$_$isolateProperties,'

870 '${_}null)$N');

871

872 // Reset the map.

873 buffer.write("$classesCollector$_=${_}null$N$n");

874 }

875 }

876

877 void emitStaticFunctions(List<Element> staticFunctions) {

878 for (Element element in staticFunctions) {

879 ClassBuilder builder = new ClassBuilder(element, namer);

880 containerBuilder.addMember(element, builder);

881 getElementDescriptor(element).properties.addAll(builder.properties);

882 }

883 }

884

885 void emitStaticNonFinalFieldInitializations(CodeBuffer buffer) {

886 JavaScriptConstantCompiler handler = backend.constants;

887 Iterable<VariableElement> staticNonFinalFields =

888 handler.getStaticNonFinalFieldsForEmission();

889 for (Element element in Elements.sortedByPosition(staticNonFinalFields)) {

890 // [:interceptedNames:] is handled in [emitInterceptedNames].

891 if (element == backend.interceptedNames) continue;

892 // `mapTypeToInterceptor` is handled in [emitMapTypeToInterceptor].

893 if (element == backend.mapTypeToInterceptor) continue;

894 compiler.withCurrentElement(element, () {

895 ConstantValue initialValue = handler.getInitialValueFor(element).value;

896 jsAst.Expression init =

897 js('$isolateProperties.# = #',

898 [namer.getNameOfGlobalField(element),

899 constantEmitter.referenceInInitializationContext(initialValue)]);

900 buffer.write(jsAst.prettyPrint(init, compiler,

901 monitor: compiler.dumpInfoTask));

902 buffer.write('$N');

903 });

904 }

905 }

906

907 void emitLazilyInitializedStaticFields(CodeBuffer buffer) {

908 JavaScriptConstantCompiler handler = backend.constants;

909 List<VariableElement> lazyFields =

910 handler.getLazilyInitializedFieldsForEmission();

911 if (!lazyFields.isEmpty) {

912 needsLazyInitializer = true;

913 for (VariableElement element in Elements.sortedByPosition(lazyFields)) {

914 jsAst.Expression code = backend.generatedCode[element];

915 // The code is null if we ended up not needing the lazily

916 // initialized field after all because of constant folding

917 // before code generation.

918 if (code == null) continue;

919 // The code only computes the initial value. We build the lazy-check

920 // here:

921 // lazyInitializer(prototype, 'name', fieldName, getterName, initial);

922 // The name is used for error reporting. The 'initial' must be a

923 // closure that constructs the initial value.

924 jsAst.Expression init = js('#(#,#,#,#,#)',

925 [js(lazyInitializerName),

926 js(isolateProperties),

927 js.string(element.name),

928 js.string(namer.getNameX(element)),

929 js.string(namer.getLazyInitializerName(element)),

930 code]);

931 buffer.write(jsAst.prettyPrint(init, compiler,

932 monitor: compiler.dumpInfoTask));

933 buffer.write("$N");

934 }

935 }

936 }

937

938 bool isConstantInlinedOrAlreadyEmitted(ConstantValue constant) {

939 if (constant.isFunction) return true; // Already emitted.

940 if (constant.isPrimitive) return true; // Inlined.

941 if (constant.isDummy) return true; // Inlined.

942 // The name is null when the constant is already a JS constant.

943 // TODO(floitsch): every constant should be registered, so that we can

944 // share the ones that take up too much space (like some strings).

945 if (namer.constantName(constant) == null) return true;

946 return false;

947 }

948

949 int compareConstants(ConstantValue a, ConstantValue b) {

950 // Inlined constants don't affect the order and sometimes don't even have

951 // names.

952 int cmp1 = isConstantInlinedOrAlreadyEmitted(a) ? 0 : 1;

953 int cmp2 = isConstantInlinedOrAlreadyEmitted(b) ? 0 : 1;

954 if (cmp1 + cmp2 < 2) return cmp1 - cmp2;

955

956 // Emit constant interceptors first. Constant interceptors for primitives

957 // might be used by code that builds other constants. See Issue 18173.

958 if (a.isInterceptor != b.isInterceptor) {

959 return a.isInterceptor ? -1 : 1;

960 }

961

962 // Sorting by the long name clusters constants with the same constructor

963 // which compresses a tiny bit better.

964 int r = namer.constantLongName(a).compareTo(namer.constantLongName(b));

965 if (r != 0) return r;

966 // Resolve collisions in the long name by using the constant name (i.e. JS

967 // name) which is unique.

968 return namer.constantName(a).compareTo(namer.constantName(b));

969 }

970

971 void emitCompileTimeConstants(CodeBuffer buffer, OutputUnit outputUnit) {

972 List<ConstantValue> constants = outputConstantLists[outputUnit];

973 if (constants == null) return;

974 bool isMainBuffer = buffer == mainBuffer;

975 if (compiler.hasIncrementalSupport && isMainBuffer) {

976 buffer = cachedEmittedConstantsBuffer;

977 }

978 for (ConstantValue constant in constants) {

979 if (compiler.hasIncrementalSupport && isMainBuffer) {

980 if (cachedEmittedConstants.contains(constant)) continue;

981 cachedEmittedConstants.add(constant);

982 }

983 String name = namer.constantName(constant);

984 jsAst.Expression init = js('#.# = #',

985 [namer.globalObjectForConstant(constant), name,

986 constantInitializerExpression(constant)]);

987 buffer.write(jsAst.prettyPrint(init, compiler,

988 monitor: compiler.dumpInfoTask));

989 buffer.write('$N');

990 }

991 if (compiler.hasIncrementalSupport && isMainBuffer) {

992 mainBuffer.add(cachedEmittedConstantsBuffer);

993 }

994 }

995

996 jsAst.Template get makeConstantListTemplate {

997 // TODO(floitsch): there is no harm in caching the template.

998 return jsAst.js.uncachedExpressionTemplate(

999 '${namer.isolateName}.$makeConstListProperty(#)');

1000 }

1001

1002 void emitMakeConstantList(CodeBuffer buffer) {

1003 buffer.write(

1004 jsAst.prettyPrint(

1005 // Functions are stored in the hidden class and not as properties in

1006 // the object. We never actually look at the value, but only want

1007 // to know if the property exists.

1008 js.statement(r'''#.# = function(list) {

1009 list.immutable$list = Array;

1010 list.fixed$length = Array;

1011 return list;

1012 }''',

1013 [namer.isolateName, makeConstListProperty]),

1014 compiler, monitor: compiler.dumpInfoTask));

1015 buffer.write(N);

1016 }

1017

1018 /// Returns the code equivalent to:

1019 /// `function(args) { $.startRootIsolate(X.main$closure(), args); }`

1020 jsAst.Expression buildIsolateSetupClosure(Element appMain,

1021 Element isolateMain) {

1022 jsAst.Expression mainAccess = namer.isolateStaticClosureAccess(appMain);

1023 // Since we pass the closurized version of the main method to

1024 // the isolate method, we must make sure that it exists.

1025 return js('function(a){ #(#, a); }',

1026 [namer.elementAccess(isolateMain), mainAccess]);

1027 }

1028

1029 /**

1030 * Emits code that sets the `isolateTag embedded global to a unique string.

1031 */

1032 jsAst.Expression generateIsolateAffinityTagInitialization() {

1033 jsAst.Expression getIsolateTagAccess =

1034 generateEmbeddedGlobalAccess(embeddedNames.GET_ISOLATE_TAG);

1035 jsAst.Expression isolateTagAccess =

1036 generateEmbeddedGlobalAccess(embeddedNames.ISOLATE_TAG);

1037

1038 return js('''

1039 !function() {

1040 // On V8, the 'intern' function converts a string to a symbol, which

1041 // makes property access much faster.

1042 function intern(s) {

1043 var o = {};

1044 o[s] = 1;

1045 return Object.keys(convertToFastObject(o))[0];

1046 }

1047

1048 # = function(name) { // embedded getIsolateTag

1049 return intern("___dart_" + name + #); // embedded isolateTag

1050 };

1051

1052 // To ensure that different programs loaded into the same context (page)

1053 // use distinct dispatch properies, we place an object on `Object` to

1054 // contain the names already in use.

1055 var tableProperty = "___dart_isolate_tags_";

1056 var usedProperties = Object[tableProperty] \|\|

1057 (Object[tableProperty] = Object.create(null));

1058

1059 var rootProperty = "_${generateIsolateTagRoot()}";

1060 for (var i = 0; ; i++) {

1061 var property = intern(rootProperty + "_" + i + "_");

1062 if (!(property in usedProperties)) {

1063 usedProperties[property] = 1;

1064 # = property; // embedded isolateTag

1065 break;

1066 }

1067 }

1068 }()

1069 ''', [getIsolateTagAccess,

1070 isolateTagAccess,

1071 isolateTagAccess]);

1072 }

1073

1074 jsAst.Expression generateDispatchPropertyNameInitialization() {

1075 jsAst.Expression dispatchPropertyNameAccess =

1076 generateEmbeddedGlobalAccess(embeddedNames.DISPATCH_PROPERTY_NAME);

1077 jsAst.Expression getIsolateTagAccess =

1078 generateEmbeddedGlobalAccess(embeddedNames.GET_ISOLATE_TAG);

1079 return js('# = #("dispatch_record")',

1080 [dispatchPropertyNameAccess,

1081 getIsolateTagAccess]);

1082 }

1083

1084 String generateIsolateTagRoot() {

1085 // TODO(sra): MD5 of contributing source code or URIs?

1086 return 'ZxYxX';

1087 }

1088

1089 emitMain(CodeBuffer buffer) {

1090 if (compiler.isMockCompilation) return;

1091 Element main = compiler.mainFunction;

1092 jsAst.Expression mainCallClosure = null;

1093 if (compiler.hasIsolateSupport) {

1094 Element isolateMain =

1095 backend.isolateHelperLibrary.find(JavaScriptBackend.START_ROOT_ISOLATE);

1096 mainCallClosure = buildIsolateSetupClosure(main, isolateMain);

1097 } else if (compiler.hasIncrementalSupport) {

1098 mainCallClosure =

1099 js('function() { return #(); }', namer.elementAccess(main));

1100 } else {

1101 mainCallClosure = namer.elementAccess(main);

1102 }

1103

1104 if (backend.needToInitializeIsolateAffinityTag) {

1105 buffer.write(

1106 jsAst.prettyPrint(generateIsolateAffinityTagInitialization(),

1107 compiler, monitor: compiler.dumpInfoTask));

1108 buffer.write(N);

1109 }

1110 if (backend.needToInitializeDispatchProperty) {

1111 assert(backend.needToInitializeIsolateAffinityTag);

1112 buffer.write(

1113 jsAst.prettyPrint(generateDispatchPropertyNameInitialization(),

1114 compiler, monitor: compiler.dumpInfoTask));

1115 buffer.write(N);

1116 }

1117

1118 jsAst.Expression currentScriptAccess =

1119 generateEmbeddedGlobalAccess(embeddedNames.CURRENT_SCRIPT);

1120

1121 addComment('BEGIN invoke [main].', buffer);

1122 // This code finds the currently executing script by listening to the

1123 // onload event of all script tags and getting the first script which

1124 // finishes. Since onload is called immediately after execution this should

1125 // not substantially change execution order.

1126 jsAst.Statement invokeMain = js.statement('''

1127 (function (callback) {

1128 if (typeof document === "undefined") {

1129 callback(null);

1130 return;

1131 }

1132 if (document.currentScript) {

1133 callback(document.currentScript);

1134 return;

1135 }

1136

1137 var scripts = document.scripts;

1138 function onLoad(event) {

1139 for (var i = 0; i < scripts.length; ++i) {

1140 scripts[i].removeEventListener("load", onLoad, false);

1141 }

1142 callback(event.target);

1143 }

1144 for (var i = 0; i < scripts.length; ++i) {

1145 scripts[i].addEventListener("load", onLoad, false);

1146 }

1147 })(function(currentScript) {

1148 # = currentScript; // embedded currentScript.

1149

1150 if (typeof dartMainRunner === "function") {

1151 dartMainRunner(#, []); // mainCallClosure.

1152 } else {

1153 #([]); // mainCallClosure.

1154 }

1155 })$N''', [currentScriptAccess,

1156 mainCallClosure,

1157 mainCallClosure]);

1158

1159 buffer.write(';');

1160 buffer.write(jsAst.prettyPrint(invokeMain,

1161 compiler, monitor: compiler.dumpInfoTask));

1162 buffer.write(N);

1163 addComment('END invoke [main].', buffer);

1164 }

1165

1166 void emitInitFunction(CodeBuffer buffer) {

1167 jsAst.FunctionDeclaration decl = js.statement('''

1168 function init() {

1169 $isolateProperties = Object.create(null);

1170 #; #; #;

1171 }''', [

1172 buildDefineClassAndFinishClassFunctionsIfNecessary(),

1173 buildLazyInitializerFunctionIfNecessary(),

1174 buildFinishIsolateConstructor()]);

1175

1176 buffer.write(jsAst.prettyPrint(decl,

1177 compiler, monitor: compiler.dumpInfoTask).getText());

1178 if (compiler.enableMinification) buffer.write('\n');

1179 }

1180

1181 void emitConvertToFastObjectFunction() {

1182 List<jsAst.Statement> debugCode = <jsAst.Statement>[];

1183 if (DEBUG_FAST_OBJECTS) {

1184 debugCode.add(js.statement(r'''

1185 // The following only works on V8 when run with option

1186 // "--allow-natives-syntax". We use'new Function' because the

1187 // miniparser does not understand V8 native syntax.

1188 if (typeof print === "function") {

1189 var HasFastProperties =

1190 new Function("a", "return %HasFastProperties(a)");

1191 print("Size of global object: "

1192 + String(Object.getOwnPropertyNames(properties).length)

1193 + ", fast properties " + HasFastProperties(properties));

1194 }'''));

1195 }

1196

1197 jsAst.Statement convertToFastObject = js.statement(r'''

1198 function convertToFastObject(properties) {

1199 // Create an instance that uses 'properties' as prototype. This should

1200 // make 'properties' a fast object.

1201 function MyClass() {};

1202 MyClass.prototype = properties;

1203 new MyClass();

1204 #;

1205 return properties;

1206 }''', [debugCode]);

1207

1208 mainBuffer.add(jsAst.prettyPrint(convertToFastObject, compiler));

1209 mainBuffer.add(N);

1210 }

1211

1212 void writeLibraryDescriptors(CodeBuffer buffer, LibraryElement library) {

1213 var uri = "";

1214 if (!compiler.enableMinification \|\| backend.mustPreserveUris) {

1215 uri = library.canonicalUri;

1216 if (uri.scheme == 'file' && compiler.outputUri != null) {

1217 uri = relativize(compiler.outputUri, library.canonicalUri, false);

1218 }

1219 }

1220 ClassBuilder descriptor = elementDescriptors[library];

1221 if (descriptor == null) {

1222 // Nothing of the library was emitted.

1223 // TODO(floitsch): this should not happen. We currently have an example

1224 // with language/prefix6_negative_test.dart where we have an instance

1225 // method without its corresponding class.

1226 return;

1227 }

1228

1229 String libraryName =

1230 (!compiler.enableMinification \|\| backend.mustRetainLibraryNames) ?

1231 library.getLibraryName() :

1232 "";

1233

1234 jsAst.Fun metadata = metadataEmitter.buildMetadataFunction(library);

1235

1236 jsAst.ObjectInitializer initializers = descriptor.toObjectInitializer();

1237

1238 compiler.dumpInfoTask.registerElementAst(library, metadata);

1239 compiler.dumpInfoTask.registerElementAst(library, initializers);

1240 buffer

1241 ..write('["$libraryName",$_')

1242 ..write('"${uri}",$_')

1243 ..write(metadata == null ? "" : jsAst.prettyPrint(metadata,

1244 compiler,

1245 monitor: compiler.dumpInfoTask))

1246 ..write(',$_')

1247 ..write(namer.globalObjectFor(library))

1248 ..write(',$_')

1249 ..write(jsAst.prettyPrint(initializers,

1250 compiler,

1251 monitor: compiler.dumpInfoTask))

1252 ..write(library == compiler.mainApp ? ',${n}1' : "")

1253 ..write('],$n');

1254 }

1255

1256 void emitPrecompiledConstructor(OutputUnit outputUnit,

1257 String constructorName,

1258 jsAst.Expression constructorAst) {

1259 cspPrecompiledFunctionFor(outputUnit).add(

1260 new jsAst.FunctionDeclaration(

1261 new jsAst.VariableDeclaration(constructorName), constructorAst));

1262 cspPrecompiledFunctionFor(outputUnit).add(

1263 js.statement(r'''{

1264 #.builtin$cls = #;

1265 if (!"name" in #)

1266 #.name = #;

1267 $desc=$collectedClasses.#;

1268 if ($desc instanceof Array) $desc = $desc[1];

1269 #.prototype = $desc;

1270 }''',

1271 [ constructorName, js.string(constructorName),

1272 constructorName,

1273 constructorName, js.string(constructorName),

1274 constructorName,

1275 constructorName

1276 ]));

1277

1278 cspPrecompiledConstructorNamesFor(outputUnit).add(js('#', constructorName));

1279 }

1280

1281 /// Extracts the output name of the compiler's outputUri.

1282 String deferredPartFileName(OutputUnit outputUnit,

1283 {bool addExtension: true}) {

1284 String outPath = compiler.outputUri != null

1285 ? compiler.outputUri.path

1286 : "out";

1287 String outName = outPath.substring(outPath.lastIndexOf('/') + 1);

1288 String extension = addExtension ? ".part.js" : "";

1289 if (outputUnit == compiler.deferredLoadTask.mainOutputUnit) {

1290 return "$outName$extension";

1291 } else {

1292 String name = outputUnit.name;

1293 return "${outName}_$name$extension";

1294 }

1295 }

1296

1297 void emitLibraries(Iterable<LibraryElement> libraries) {

1298 if (libraries.isEmpty) return;

1299

1300 // TODO(karlklose): document what kinds of fields this loop adds to the

1301 // library class builder.

1302 for (LibraryElement element in libraries) {

1303 LibraryElement library = element;

1304 ClassBuilder builder = new ClassBuilder(library, namer);

1305 if (classEmitter.emitFields(library, builder, null, emitStatics: true)) {

1306 jsAst.ObjectInitializer initializer = builder.toObjectInitializer();

1307 compiler.dumpInfoTask.registerElementAst(builder.element, initializer);

1308 getElementDescriptor(library).properties.addAll(initializer.properties);

1309 }

1310 }

1311 }

1312

1313 void emitTypedefs() {

1314 OutputUnit mainOutputUnit = compiler.deferredLoadTask.mainOutputUnit;

1315

1316 // Emit all required typedef declarations into the main output unit.

1317 // TODO(karlklose): unify required classes and typedefs to declarations

1318 // and have builders for each kind.

1319 for (TypedefElement typedef in typedefsNeededForReflection) {

1320 OutputUnit mainUnit = compiler.deferredLoadTask.mainOutputUnit;

1321 LibraryElement library = typedef.library;

1322 // TODO(karlklose): add a TypedefBuilder and move this code there.

1323 DartType type = typedef.alias;

1324 int typeIndex = metadataEmitter.reifyType(type);

1325 String typeReference =

1326 encoding.encodeTypedefFieldDescriptor(typeIndex);

1327 jsAst.Property descriptor = new jsAst.Property(

1328 js.string(namer.classDescriptorProperty),

1329 js.string(typeReference));

1330 jsAst.Node declaration = new jsAst.ObjectInitializer([descriptor]);

1331 String mangledName = namer.getNameX(typedef);

1332 String reflectionName = getReflectionName(typedef, mangledName);

1333 getElementDescriptor(library)

1334 ..addProperty(mangledName, declaration)

1335 ..addProperty("+$reflectionName", js.string(''));

1336 // Also emit a trivial constructor for CSP mode.

1337 String constructorName = mangledName;

1338 jsAst.Expression constructorAst = js('function() {}');

1339 emitPrecompiledConstructor(mainOutputUnit,

1340 constructorName,

1341 constructorAst);

1342 }

1343 }

1344

1345 void emitMangledNames() {

1346 if (!mangledFieldNames.isEmpty) {

1347 var keys = mangledFieldNames.keys.toList();

1348 keys.sort();

1349 var properties = [];

1350 for (String key in keys) {

1351 var value = js.string('${mangledFieldNames[key]}');

1352 properties.add(new jsAst.Property(js.string(key), value));

1353 }

1354

1355 jsAst.Expression mangledNamesAccess =

1356 generateEmbeddedGlobalAccess(embeddedNames.MANGLED_NAMES);

1357 var map = new jsAst.ObjectInitializer(properties);

1358 mainBuffer.write(

1359 jsAst.prettyPrint(

1360 js.statement('# = #', [mangledNamesAccess, map]),

1361 compiler,

1362 monitor: compiler.dumpInfoTask));

1363 if (compiler.enableMinification) {

1364 mainBuffer.write(';');

1365 }

1366 }

1367 if (!mangledGlobalFieldNames.isEmpty) {

1368 var keys = mangledGlobalFieldNames.keys.toList();

1369 keys.sort();

1370 var properties = [];

1371 for (String key in keys) {

1372 var value = js.string('${mangledGlobalFieldNames[key]}');

1373 properties.add(new jsAst.Property(js.string(key), value));

1374 }

1375 jsAst.Expression mangledGlobalNamesAccess =

1376 generateEmbeddedGlobalAccess(embeddedNames.MANGLED_GLOBAL_NAMES);

1377 var map = new jsAst.ObjectInitializer(properties);

1378 mainBuffer.write(

1379 jsAst.prettyPrint(

1380 js.statement('# = #', [mangledGlobalNamesAccess, map]),

1381 compiler,

1382 monitor: compiler.dumpInfoTask));

1383 if (compiler.enableMinification) {

1384 mainBuffer.write(';');

1385 }

1386 }

1387 }

1388

1389 void checkEverythingEmitted(Iterable<Element> elements) {

1390 List<Element> pendingStatics;

1391 if (!compiler.hasIncrementalSupport) {

1392 pendingStatics =

1393 Elements.sortedByPosition(elements.where((e) => !e.isLibrary));

1394

1395 pendingStatics.forEach((element) =>

1396 compiler.reportInfo(

1397 element, MessageKind.GENERIC, {'text': 'Pending statics.'}));

1398 }

1399

1400 if (pendingStatics != null && !pendingStatics.isEmpty) {

1401 compiler.internalError(pendingStatics.first,

1402 'Pending statics (see above).');

1403 }

1404 }

1405

1406 void emitMainOutputUnit(Map<OutputUnit, String> deferredLoadHashes,

1407 CodeBuffer nativeBuffer) {

1408 bool isProgramSplit = compiler.deferredLoadTask.isProgramSplit;

1409 OutputUnit mainOutputUnit = compiler.deferredLoadTask.mainOutputUnit;

1410

1411 mainBuffer.add(buildGeneratedBy());

1412 addComment(HOOKS_API_USAGE, mainBuffer);

1413

1414 if (isProgramSplit) {

1415 /// For deferred loading we communicate the initializers via this global

1416 /// variable. The deferred hunks will add their initialization to this.

1417 /// The semicolon is important in minified mode, without it the

1418 /// following parenthesis looks like a call to the object literal.

1419 mainBuffer..add(

1420 'self.${deferredInitializers} = self.${deferredInitializers} \|\| '

1421 'Object.create(null);$n');

1422 }

1423

1424 // Using a named function here produces easier to read stack traces in

1425 // Chrome/V8.

1426 mainBuffer.add('(function(${namer.currentIsolate})$_{\n');

1427 if (compiler.hasIncrementalSupport) {

1428 mainBuffer.add(

1429 '(this.\$dart_unsafe_eval ='

1430 ' this.\$dart_unsafe_eval \|\| Object.create(null))'

1431 '.patch = function(a) { eval(a) }$N');

1432 }

1433 if (isProgramSplit) {

1434 /// We collect all the global state of the, so it can be passed to the

1435 /// initializer of deferred files.

1436 mainBuffer.add('var ${globalsHolder}$_=${_}Object.create(null)$N');

1437 }

1438 mainBuffer.add('function dart()$_{$n'

1439 '${_}${_}this.x$_=${_}0$N'

1440 '${_}${_}delete this.x$N'

1441 '}$n');

1442 for (String globalObject in Namer.reservedGlobalObjectNames) {

1443 // The global objects start as so-called "slow objects". For V8, this

1444 // means that it won't try to make map transitions as we add properties

1445 // to these objects. Later on, we attempt to turn these objects into

1446 // fast objects by calling "convertToFastObject" (see

1447 // [emitConvertToFastObjectFunction]).

1448 mainBuffer.write('var ${globalObject}$_=${_}');

1449 if(isProgramSplit) {

1450 mainBuffer.add('${globalsHolder}.$globalObject$_=${_}');

1451 }

1452 mainBuffer.write('new dart$N');

1453 }

1454

1455 mainBuffer.add('function ${namer.isolateName}()$_{}\n');

1456 if (isProgramSplit) {

1457 mainBuffer

1458 .write('${globalsHolder}.${namer.isolateName}$_=$_'

1459 '${namer.isolateName}$N'

1460 '${globalsHolder}.$initName$_=${_}$initName$N');

1461 }

1462 mainBuffer.add('init()$N$n');

1463 mainBuffer.add('$isolateProperties$_=$_$isolatePropertiesName$N');

1464

1465 emitStaticFunctions(task.outputStaticLists[mainOutputUnit]);

1466

1467 // Only output the classesCollector if we actually have any classes.

1468 if (!(nativeClasses.isEmpty &&

1469 compiler.codegenWorld.staticFunctionsNeedingGetter.isEmpty &&

1470 outputClassLists.values.every((classList) => classList.isEmpty) &&

1471 typedefsNeededForReflection.isEmpty)) {

1472 // Shorten the code by using "$$" as temporary.

1473 classesCollector = r"$$";

1474 mainBuffer.add('var $classesCollector$_=${_}Object.create(null)$N$n');

1475 }

1476

1477 if (!nativeClasses.isEmpty) {

1478 addComment('Native classes', mainBuffer);

1479 }

1480

1481 List<ClassElement> classes = task.outputClassLists[mainOutputUnit];

1482 if (classes != null) {

1483 for (ClassElement element in classes) {

1484 generateClass(element, getElementDescriptor(element));

1485 }

1486 }

1487

1488 if (compiler.enableMinification) {

1489 mainBuffer.write(';');

1490 }

1491

1492 if (elementDescriptors.isNotEmpty) {

1493 Iterable<LibraryElement> libraries =

1494 task.outputLibraryLists[mainOutputUnit];

1495 if (libraries == null) libraries = [];

1496 emitLibraries(libraries);

1497 emitTypedefs();

1498 emitMangledNames();

1499

1500 checkEverythingEmitted(elementDescriptors.keys);

1501

1502 CodeBuffer libraryBuffer = new CodeBuffer();

1503 for (LibraryElement library in Elements.sortedByPosition(libraries)) {

1504 writeLibraryDescriptors(libraryBuffer, library);

1505 elementDescriptors.remove(library);

1506 }

1507

1508 mainBuffer

1509 ..write('(')

1510 ..write(

1511 jsAst.prettyPrint(

1512 getReflectionDataParser(classesCollector, backend),

1513 compiler))

1514 ..write(')')

1515 ..write('([$n')

1516 ..add(libraryBuffer)

1517 ..write('])$N');

1518

1519 emitFinishClassesInvocationIfNecessary(mainBuffer);

1520 }

1521

1522 typeTestEmitter.emitRuntimeTypeSupport(mainBuffer, mainOutputUnit);

1523 interceptorEmitter.emitGetInterceptorMethods(mainBuffer);

1524 interceptorEmitter.emitOneShotInterceptors(mainBuffer);

1525

1526 if (task.outputContainsConstantList) {

1527 emitMakeConstantList(mainBuffer);

1528 }

1529

1530 // Constants in checked mode call into RTI code to set type information

1531 // which may need getInterceptor (and one-shot interceptor) methods, so

1532 // we have to make sure that [emitGetInterceptorMethods] and

1533 // [emitOneShotInterceptors] have been called.

1534 emitCompileTimeConstants(mainBuffer, mainOutputUnit);

1535

1536 emitDeferredBoilerPlate(mainBuffer, deferredLoadHashes);

1537

1538 // Static field initializations require the classes and compile-time

1539 // constants to be set up.

1540 emitStaticNonFinalFieldInitializations(mainBuffer);

1541 interceptorEmitter.emitInterceptedNames(mainBuffer);

1542 interceptorEmitter.emitMapTypeToInterceptor(mainBuffer);

1543 emitLazilyInitializedStaticFields(mainBuffer);

1544

1545 mainBuffer.writeln();

1546 mainBuffer.add(nativeBuffer);

1547

1548 metadataEmitter.emitMetadata(mainBuffer);

1549

1550 isolateProperties = isolatePropertiesName;

1551 // The following code should not use the short-hand for the

1552 // initialStatics.

1553 mainBuffer.add('${namer.currentIsolate}$_=${_}null$N');

1554

1555 emitFinishIsolateConstructorInvocation(mainBuffer);

1556 mainBuffer.add(

1557 '${namer.currentIsolate}$_=${_}new ${namer.isolateName}()$N');

1558

1559 emitConvertToFastObjectFunction();

1560 for (String globalObject in Namer.reservedGlobalObjectNames) {

1561 mainBuffer.add('$globalObject = convertToFastObject($globalObject)$N');

1562 }

1563 if (DEBUG_FAST_OBJECTS) {

1564 mainBuffer.add(r'''

1565 // The following only works on V8 when run with option

1566 // "--allow-natives-syntax". We use'new Function' because the

1567 // miniparser does not understand V8 native syntax.

1568 if (typeof print === "function") {

1569 var HasFastProperties =

1570 new Function("a", "return %HasFastProperties(a)");

1571 print("Size of global helper object: "

1572 + String(Object.getOwnPropertyNames(H).length)

1573 + ", fast properties " + HasFastProperties(H));

1574 print("Size of global platform object: "

1575 + String(Object.getOwnPropertyNames(P).length)

1576 + ", fast properties " + HasFastProperties(P));

1577 print("Size of global dart:html object: "

1578 + String(Object.getOwnPropertyNames(W).length)

1579 + ", fast properties " + HasFastProperties(W));

1580 print("Size of isolate properties object: "

1581 + String(Object.getOwnPropertyNames($).length)

1582 + ", fast properties " + HasFastProperties($));

1583 print("Size of constant object: "

1584 + String(Object.getOwnPropertyNames(C).length)

1585 + ", fast properties " + HasFastProperties(C));

1586 var names = Object.getOwnPropertyNames($);

1587 for (var i = 0; i < names.length; i++) {

1588 print("$." + names[i]);

1589 }

1590 }

1591 ''');

1592 for (String object in Namer.userGlobalObjects) {

1593 mainBuffer.add('''

1594 if (typeof print === "function") {

1595 print("Size of $object: "

1596 + String(Object.getOwnPropertyNames($object).length)

1597 + ", fast properties " + HasFastProperties($object));

1598 }

1599 ''');

1600 }

1601 }

1602

1603 jsAst.FunctionDeclaration precompiledFunctionAst =

1604 buildCspPrecompiledFunctionFor(mainOutputUnit);

1605 emitInitFunction(mainBuffer);

1606 emitMain(mainBuffer);

1607 mainBuffer.add('})()\n');

1608

1609 if (compiler.useContentSecurityPolicy) {

1610 mainBuffer.write(

1611 jsAst.prettyPrint(

1612 precompiledFunctionAst,

1613 compiler,

1614 monitor: compiler.dumpInfoTask,

1615 allowVariableMinification: false).getText());

1616 }

1617

1618 String assembledCode = mainBuffer.getText();

1619 if (generateSourceMap) {

1620 outputSourceMap(assembledCode, mainBuffer, '',

1621 compiler.sourceMapUri, compiler.outputUri);

1622 mainBuffer.add(

1623 generateSourceMapTag(compiler.sourceMapUri, compiler.outputUri));

1624 assembledCode = mainBuffer.getText();

1625 }

1626

1627 compiler.outputProvider('', 'js')

1628 ..add(assembledCode)

1629 ..close();

1630 compiler.assembledCode = assembledCode;

1631

1632 if (!compiler.useContentSecurityPolicy) {

1633 CodeBuffer cspBuffer = new CodeBuffer();

1634 cspBuffer.add(mainBuffer);

1635 cspBuffer.write("""

1636 {

1637 var message =

1638 'Deprecation: Automatic generation of output for Content Security\\n' +

1639 'Policy is deprecated and will be removed with the next development\\n' +

1640 'release. Use the --csp option to generate CSP restricted output.';

1641 if (typeof dartPrint == "function") {

1642 dartPrint(message);

1643 } else if (typeof console == "object" && typeof console.log == "function") {

1644 console.log(message);

1645 } else if (typeof print == "function") {

1646 print(message);

1647 }

1648 }\n""");

1649

1650 cspBuffer.write(

1651 jsAst.prettyPrint(

1652 precompiledFunctionAst, compiler,

1653 allowVariableMinification: false).getText());

1654

1655 compiler.outputProvider('', 'precompiled.js')

1656 ..add(cspBuffer.getText())

1657 ..close();

1658 }

1659 }

1660

1661 /// Returns a map from OutputUnit to a hash of its content. The hash uniquely

1662 /// identifies the code of the output-unit. It does not include

1663 /// boilerplate JS code, like the sourcemap directives or the hash

1664 /// itself.

1665 Map<OutputUnit, String> emitDeferredOutputUnits() {

1666 if (!compiler.deferredLoadTask.isProgramSplit) return const {};

1667

1668 Map<OutputUnit, CodeBuffer> outputBuffers =

1669 new Map<OutputUnit, CodeBuffer>();

1670

1671 for (OutputUnit outputUnit in compiler.deferredLoadTask.allOutputUnits) {

1672 if (outputUnit == compiler.deferredLoadTask.mainOutputUnit) continue;

1673

1674 List<Element> functions = task.outputStaticLists[outputUnit];

1675 if (functions != null) {

1676 emitStaticFunctions(functions);

1677 }

1678

1679 List<ClassElement> classes = task.outputClassLists[outputUnit];

1680 if (classes != null) {

1681 for (ClassElement element in classes) {

1682 generateClass(element, getElementDescriptor(element));

1683 }

1684 }

1685

1686 if (elementDescriptors.isNotEmpty) {

1687 Iterable<LibraryElement> libraries =

1688 task.outputLibraryLists[outputUnit];

1689 if (libraries == null) libraries = [];

1690 emitLibraries(libraries);

1691

1692 CodeBuffer buffer = new CodeBuffer();

1693 outputBuffers[outputUnit] = buffer;

1694 for (LibraryElement library in Elements.sortedByPosition(libraries)) {

1695 writeLibraryDescriptors(buffer, library);

1696 elementDescriptors.remove(library);

1697 }

1698 }

1699 }

1700

1701 return emitDeferredCode(outputBuffers);

1702 }

1703

1704 CodeBuffer buildNativesBuffer() {

1705 // Emit native classes on [nativeBuffer].

1706 final CodeBuffer nativeBuffer = new CodeBuffer();

1707

1708 if (nativeClasses.isEmpty) return nativeBuffer;

1709

1710

1711 addComment('Native classes', nativeBuffer);

1712

1713 nativeEmitter.generateNativeClasses(nativeClasses, mainBuffer,

1714 additionalProperties);

1715

1716 nativeEmitter.finishGenerateNativeClasses();

1717 nativeEmitter.assembleCode(nativeBuffer);

1718

1719 return nativeBuffer;

1720 }

1721

1722 void emitProgram(Program program) {

1723 // Shorten the code by using [namer.currentIsolate] as temporary.

1724 isolateProperties = namer.currentIsolate;

1725

1726 classesCollector = r"$$";

1727

1728 // Emit deferred units first, so we have their hashes.

1729 // Map from OutputUnit to a hash of its content. The hash uniquely

1730 // identifies the code of the output-unit. It does not include

1731 // boilerplate JS code, like the sourcemap directives or the hash

1732 // itself.

1733 Map<OutputUnit, String> deferredLoadHashes = emitDeferredOutputUnits();

1734 CodeBuffer nativeBuffer = buildNativesBuffer();

1735 emitMainOutputUnit(deferredLoadHashes, nativeBuffer);

1736

1737 if (backend.requiresPreamble &&

1738 !backend.htmlLibraryIsLoaded) {

1739 compiler.reportHint(NO_LOCATION_SPANNABLE, MessageKind.PREAMBLE);

1740 }

1741 }

1742

1743 String generateSourceMapTag(Uri sourceMapUri, Uri fileUri) {

1744 if (sourceMapUri != null && fileUri != null) {

1745 String sourceMapFileName = relativize(fileUri, sourceMapUri, false);

1746 return '''

1747

1748 //# sourceMappingURL=$sourceMapFileName

1749 ''';

1750 }

1751 return '';

1752 }

1753

1754 ClassBuilder getElementDescriptor(Element element) {

1755 Element owner = element.library;

1756 if (!element.isLibrary && !element.isTopLevel && !element.isNative) {

1757 // For static (not top level) elements, record their code in a buffer

1758 // specific to the class. For now, not supported for native classes and

1759 // native elements.

1760 ClassElement cls =

1761 element.enclosingClassOrCompilationUnit.declaration;

1762 if (compiler.codegenWorld.directlyInstantiatedClasses.contains(cls)

1763 && !cls.isNative) {

1764 owner = cls;

1765 }

1766 }

1767 if (owner == null) {

1768 compiler.internalError(element, 'Owner is null.');

1769 }

1770 return elementDescriptors.putIfAbsent(

1771 owner,

1772 () => new ClassBuilder(owner, namer));

1773 }

1774

1775 /// Emits support-code for deferred loading into [buffer].

1776 void emitDeferredBoilerPlate(CodeBuffer buffer,

1777 Map<OutputUnit, String> deferredLoadHashes) {

1778 // Function for checking if a hunk is loaded given its hash.

1779 buffer.write(jsAst.prettyPrint(

1780 js('# = function(hunkHash) {'

1781 ' return !!$deferredInitializers[hunkHash];'

1782 '}', generateEmbeddedGlobalAccess(embeddedNames.IS_HUNK_LOADED)),

1783 compiler, monitor: compiler.dumpInfoTask));

1784 buffer.write('$N');

1785 // Function for initializing a loaded hunk, given its hash.

1786 buffer.write(jsAst.prettyPrint(

1787 js('# = function(hunkHash) {'

1788 ' $deferredInitializers[hunkHash]('

1789 '$globalsHolder, ${namer.currentIsolate})'

1790 '}',

1791 generateEmbeddedGlobalAccess(

1792 embeddedNames.INITIALIZE_LOADED_HUNK)),

1793 compiler, monitor: compiler.dumpInfoTask));

1794 buffer.write('$N');

1795 // Write a javascript mapping from Deferred import load ids (derrived

1796 // from the import prefix.) to a list of lists of uris of hunks to load,

1797 // and a corresponding mapping to a list of hashes used by

1798 // INITIALIZE_LOADED_HUNK and IS_HUNK_LOADED.

1799 Map<String, List<String>> deferredLibraryUris =

1800 new Map<String, List<String>>();

1801 Map<String, List<String>> deferredLibraryHashes =

1802 new Map<String, List<String>>();

1803 compiler.deferredLoadTask.hunksToLoad.forEach(

1804 (String loadId, List<OutputUnit>outputUnits) {

1805 List<String> uris = new List<String>();

1806 List<String> hashes = new List<String>();

1807 deferredLibraryHashes[loadId] = new List<String>();

1808 for (OutputUnit outputUnit in outputUnits) {

1809 uris.add(deferredPartFileName(outputUnit));

1810 hashes.add(deferredLoadHashes[outputUnit]);

1811 }

1812

1813 deferredLibraryUris[loadId] = uris;

1814 deferredLibraryHashes[loadId] = hashes;

1815 });

1816

1817 void emitMapping(String name, Map<String, List<String>> mapping) {

1818 List<jsAst.Property> properties = new List<jsAst.Property>();

1819 mapping.forEach((String key, List<String> values) {

1820 properties.add(new jsAst.Property(js.escapedString(key),

1821 new jsAst.ArrayInitializer.from(

1822 values.map(js.escapedString))));

1823 });

1824 jsAst.Node initializer =

1825 new jsAst.ObjectInitializer(properties, isOneLiner: true);

1826

1827 jsAst.Node globalName = generateEmbeddedGlobalAccess(name);

1828 buffer.write(jsAst.prettyPrint(

1829 js("# = #", [globalName, initializer]),

1830 compiler, monitor: compiler.dumpInfoTask));

1831 buffer.write('$N');

1832

1833 }

1834

1835 emitMapping(embeddedNames.DEFERRED_LIBRARY_URIS, deferredLibraryUris);

1836 emitMapping(embeddedNames.DEFERRED_LIBRARY_HASHES,

1837 deferredLibraryHashes);

1838 }

1839

1840 /// Emits code for all output units except the main.

1841 /// Returns a mapping from outputUnit to a hash of the corresponding hunk that

1842 /// can be used for calling the initializer.

1843 Map<OutputUnit, String> emitDeferredCode(

1844 Map<OutputUnit, CodeBuffer> deferredBuffers) {

1845

1846 Map<OutputUnit, String> hunkHashes = new Map<OutputUnit, String>();

1847

1848 for (OutputUnit outputUnit in compiler.deferredLoadTask.allOutputUnits) {

1849 if (outputUnit == compiler.deferredLoadTask.mainOutputUnit) continue;

1850

1851 CodeBuffer libraryDescriptorBuffer = deferredBuffers[outputUnit];

1852

1853 CodeBuffer outputBuffer = new CodeBuffer();

1854

1855 outputBuffer..write(buildGeneratedBy())

1856 ..write('${deferredInitializers}.current$_=$_'

1857 'function$_(${globalsHolder}) {$N');

1858 for (String globalObject in Namer.reservedGlobalObjectNames) {

1859 outputBuffer

1860 .write('var $globalObject$_=$_'

1861 '${globalsHolder}.$globalObject$N');

1862 }

1863 outputBuffer

1864 ..write('var init$_=$_${globalsHolder}.init$N')

1865 ..write('var ${namer.isolateName}$_=$_'

1866 '${globalsHolder}.${namer.isolateName}$N');

1867 if (libraryDescriptorBuffer != null) {

1868 // TODO(ahe): This defines a lot of properties on the

1869 // Isolate.prototype object. We know this will turn it into a

1870 // slow object in V8, so instead we should do something similar

1871 // to Isolate.$finishIsolateConstructor.

1872 outputBuffer

1873 ..write('var ${namer.currentIsolate}$_=$_$isolatePropertiesName$N')

1874 // The classesCollector object ($$).

1875 ..write('$classesCollector$_=${_}Object.create(null);$n')

1876 ..write('(')

1877 ..write(

1878 jsAst.prettyPrint(

1879 getReflectionDataParser(classesCollector, backend),

1880 compiler, monitor: compiler.dumpInfoTask))

1881 ..write(')')

1882 ..write('([$n')

1883 ..addBuffer(libraryDescriptorBuffer)

1884 ..write('])$N');

1885

1886 if (outputClassLists.containsKey(outputUnit)) {

1887 outputBuffer.write(

1888 '$finishClassesName($classesCollector,$_${namer.currentIsolate},'

1889 '$_$isolatePropertiesName)$N');

1890 }

1891

1892 }

1893

1894 // Set the currentIsolate variable to the current isolate (which is

1895 // provided as second argument).

1896 // We need to do this, because we use the same variable for setting up

1897 // the isolate-properties and for storing the current isolate. During

1898 // the setup (the code above this lines) we must set the variable to

1899 // the isolate-properties.

1900 // After we have done the setup (finishing with `finishClasses`) it must

1901 // point to the current Isolate. Otherwise all methods/functions

1902 // accessing isolate variables will access the wrong object.

1903 outputBuffer.write("${namer.currentIsolate}$_=${_}arguments[1]$N");

1904 typeTestEmitter.emitRuntimeTypeSupport(outputBuffer, outputUnit);

1905

1906 emitCompileTimeConstants(outputBuffer, outputUnit);

1907 outputBuffer.write('}$N');

1908

1909 if (compiler.useContentSecurityPolicy) {

1910 jsAst.FunctionDeclaration precompiledFunctionAst =

1911 buildCspPrecompiledFunctionFor(outputUnit);

1912

1913 outputBuffer.write(

1914 jsAst.prettyPrint(

1915 precompiledFunctionAst, compiler,

1916 monitor: compiler.dumpInfoTask,

1917 allowVariableMinification: false).getText());

1918 }

1919

1920 // Make a unique hash of the code (before the sourcemaps are added)

1921 // This will be used to retrieve the initializing function from the global

1922 // variable.

1923 String hash = hashOfString(outputBuffer.getText());

1924

1925 outputBuffer.add('${deferredInitializers}["$hash"]$_=$_'

1926 '${deferredInitializers}.current$N');

1927

1928 String partPrefix = deferredPartFileName(outputUnit, addExtension: false);

1929 if (generateSourceMap) {

1930 Uri mapUri, partUri;

1931 Uri sourceMapUri = compiler.sourceMapUri;

1932 Uri outputUri = compiler.outputUri;

1933

1934 String partName = "$partPrefix.part";

1935

1936 if (sourceMapUri != null) {

1937 String mapFileName = partName + ".js.map";

1938 List<String> mapSegments = sourceMapUri.pathSegments.toList();

1939 mapSegments[mapSegments.length - 1] = mapFileName;

1940 mapUri = compiler.sourceMapUri.replace(pathSegments: mapSegments);

1941 }

1942

1943 if (outputUri != null) {

1944 String partFileName = partName + ".js";

1945 List<String> partSegments = outputUri.pathSegments.toList();

1946 partSegments[partSegments.length - 1] = partFileName;

1947 partUri = compiler.outputUri.replace(pathSegments: partSegments);

1948 }

1949

1950 outputSourceMap(outputBuffer.getText(), outputBuffer, partName,

1951 mapUri, partUri);

1952 outputBuffer.add(generateSourceMapTag(mapUri, partUri));

1953 }

1954

1955 outputBuffers[outputUnit] = outputBuffer;

1956 compiler.outputProvider(partPrefix, 'part.js')

1957 ..add(outputBuffer.getText())

1958 ..close();

1959

1960 hunkHashes[outputUnit] = hash;

1961 }

1962 return hunkHashes;

1963 }

1964

1965 String buildGeneratedBy() {

1966 var suffix = '';

1967 if (compiler.hasBuildId) suffix = ' version: ${compiler.buildId}';

1968 return '// Generated by dart2js, the Dart to JavaScript compiler$suffix.\n';

1969 }

1970

1971 void outputSourceMap(String code, CodeBuffer buffer, String name,

1972 [Uri sourceMapUri, Uri fileUri]) {

1973 if (!generateSourceMap) return;

1974 // Create a source file for the compilation output. This allows using

1975 // [:getLine:] to transform offsets to line numbers in [SourceMapBuilder].

1976 SourceFile compiledFile = new StringSourceFile(null, code);

1977 SourceMapBuilder sourceMapBuilder =

1978 new SourceMapBuilder(sourceMapUri, fileUri, compiledFile);

1979 buffer.forEachSourceLocation(sourceMapBuilder.addMapping);

1980 String sourceMap = sourceMapBuilder.build();

1981 compiler.outputProvider(name, 'js.map')

1982 ..add(sourceMap)

1983 ..close();

1984 }

1985

1986 void invalidateCaches() {

1987 if (!compiler.hasIncrementalSupport) return;

1988 if (cachedElements.isEmpty) return;

1989 for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {

1990 if (element.isInstanceMember) {

1991 cachedClassBuilders.remove(element.enclosingClass);

1992

1993 nativeEmitter.cachedBuilders.remove(element.enclosingClass);

1994

1995 }

1996 }

1997 }

1998 }

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