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| 1 // Copyright (c) 2013, 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 class InterceptorEmitter extends CodeEmitterHelper { | |
| 8 final Set<String> interceptorInvocationNames = new Set<String>(); | |
| 9 | |
| 10 void recordMangledNameOfMemberMethod(FunctionElement member, String name) { | |
| 11 if (backend.isInterceptedMethod(member)) { | |
| 12 interceptorInvocationNames.add(name); | |
| 13 } | |
| 14 } | |
| 15 | |
| 16 Set<ClassElement> interceptorsReferencedFromConstants() { | |
| 17 Set<ClassElement> classes = new Set<ClassElement>(); | |
| 18 JavaScriptConstantCompiler handler = backend.constants; | |
| 19 List<Constant> constants = handler.getConstantsForEmission(); | |
| 20 for (Constant constant in constants) { | |
| 21 if (constant is InterceptorConstant) { | |
| 22 InterceptorConstant interceptorConstant = constant; | |
| 23 classes.add(interceptorConstant.dispatchedType.element); | |
| 24 } | |
| 25 } | |
| 26 return classes; | |
| 27 } | |
| 28 | |
| 29 void emitGetInterceptorMethod(CodeBuffer buffer, | |
| 30 String key, | |
| 31 Set<ClassElement> classes) { | |
| 32 jsAst.Expression interceptorFor(ClassElement cls) { | |
| 33 return js('#.prototype', namer.elementAccess(cls)); | |
| 34 } | |
| 35 | |
| 36 /** | |
| 37 * Build a JavaScrit AST node for doing a type check on | |
| 38 * [cls]. [cls] must be a non-native interceptor class. | |
| 39 */ | |
| 40 jsAst.Statement buildInterceptorCheck(ClassElement cls) { | |
| 41 jsAst.Expression condition; | |
| 42 assert(backend.isInterceptorClass(cls)); | |
| 43 if (cls == backend.jsBoolClass) { | |
| 44 condition = js('(typeof receiver) == "boolean"'); | |
| 45 } else if (cls == backend.jsIntClass || | |
| 46 cls == backend.jsDoubleClass || | |
| 47 cls == backend.jsNumberClass) { | |
| 48 throw 'internal error'; | |
| 49 } else if (cls == backend.jsArrayClass || | |
| 50 cls == backend.jsMutableArrayClass || | |
| 51 cls == backend.jsFixedArrayClass || | |
| 52 cls == backend.jsExtendableArrayClass) { | |
| 53 condition = js('receiver.constructor == Array'); | |
| 54 } else if (cls == backend.jsStringClass) { | |
| 55 condition = js('(typeof receiver) == "string"'); | |
| 56 } else if (cls == backend.jsNullClass) { | |
| 57 condition = js('receiver == null'); | |
| 58 } else { | |
| 59 throw 'internal error'; | |
| 60 } | |
| 61 return js.statement('if (#) return #', [condition, interceptorFor(cls)]); | |
| 62 } | |
| 63 | |
| 64 bool hasArray = false; | |
| 65 bool hasBool = false; | |
| 66 bool hasDouble = false; | |
| 67 bool hasInt = false; | |
| 68 bool hasNull = false; | |
| 69 bool hasNumber = false; | |
| 70 bool hasString = false; | |
| 71 bool hasNative = false; | |
| 72 bool anyNativeClasses = compiler.enqueuer.codegen.nativeEnqueuer | |
| 73 .hasInstantiatedNativeClasses(); | |
| 74 | |
| 75 for (ClassElement cls in classes) { | |
| 76 if (cls == backend.jsArrayClass || | |
| 77 cls == backend.jsMutableArrayClass || | |
| 78 cls == backend.jsFixedArrayClass || | |
| 79 cls == backend.jsExtendableArrayClass) hasArray = true; | |
| 80 else if (cls == backend.jsBoolClass) hasBool = true; | |
| 81 else if (cls == backend.jsDoubleClass) hasDouble = true; | |
| 82 else if (cls == backend.jsIntClass) hasInt = true; | |
| 83 else if (cls == backend.jsNullClass) hasNull = true; | |
| 84 else if (cls == backend.jsNumberClass) hasNumber = true; | |
| 85 else if (cls == backend.jsStringClass) hasString = true; | |
| 86 else { | |
| 87 // The set of classes includes classes mixed-in to interceptor classes | |
| 88 // and user extensions of native classes. | |
| 89 // | |
| 90 // The set of classes also includes the 'primitive' interceptor | |
| 91 // PlainJavaScriptObject even when it has not been resolved, since it is | |
| 92 // only resolved through the reference in getNativeInterceptor when | |
| 93 // getNativeInterceptor is marked as used. Guard against probing | |
| 94 // unresolved PlainJavaScriptObject by testing for anyNativeClasses. | |
| 95 | |
| 96 if (anyNativeClasses) { | |
| 97 if (Elements.isNativeOrExtendsNative(cls)) hasNative = true; | |
| 98 } | |
| 99 } | |
| 100 } | |
| 101 if (hasDouble) { | |
| 102 hasNumber = true; | |
| 103 } | |
| 104 if (hasInt) hasNumber = true; | |
| 105 | |
| 106 if (classes.containsAll(backend.interceptedClasses)) { | |
| 107 // I.e. this is the general interceptor. | |
| 108 hasNative = anyNativeClasses; | |
| 109 } | |
| 110 | |
| 111 List<jsAst.Statement> statements = <jsAst.Statement>[]; | |
| 112 | |
| 113 if (hasNumber) { | |
| 114 jsAst.Statement whenNumber; | |
| 115 | |
| 116 /// Note: there are two number classes in play: Dart's [num], | |
| 117 /// and JavaScript's Number (typeof receiver == 'number'). This | |
| 118 /// is the fallback used when we have determined that receiver | |
| 119 /// is a JavaScript Number. | |
| 120 jsAst.Expression interceptorForNumber = interceptorFor( | |
| 121 hasDouble ? backend.jsDoubleClass : backend.jsNumberClass); | |
| 122 | |
| 123 if (hasInt) { | |
| 124 whenNumber = js.statement('''{ | |
| 125 if (Math.floor(receiver) == receiver) return #; | |
| 126 return #; | |
| 127 }''', [interceptorFor(backend.jsIntClass), interceptorForNumber]); | |
| 128 } else { | |
| 129 whenNumber = js.statement('return #', interceptorForNumber); | |
| 130 } | |
| 131 statements.add( | |
| 132 js.statement('if (typeof receiver == "number") #;', whenNumber)); | |
| 133 } | |
| 134 | |
| 135 if (hasString) { | |
| 136 statements.add(buildInterceptorCheck(backend.jsStringClass)); | |
| 137 } | |
| 138 if (hasNull) { | |
| 139 statements.add(buildInterceptorCheck(backend.jsNullClass)); | |
| 140 } else { | |
| 141 // Returning "undefined" or "null" here will provoke a JavaScript | |
| 142 // TypeError which is later identified as a null-error by | |
| 143 // [unwrapException] in js_helper.dart. | |
| 144 statements.add( | |
| 145 js.statement('if (receiver == null) return receiver')); | |
| 146 } | |
| 147 if (hasBool) { | |
| 148 statements.add(buildInterceptorCheck(backend.jsBoolClass)); | |
| 149 } | |
| 150 // TODO(ahe): It might be faster to check for Array before | |
| 151 // function and bool. | |
| 152 if (hasArray) { | |
| 153 statements.add(buildInterceptorCheck(backend.jsArrayClass)); | |
| 154 } | |
| 155 | |
| 156 if (hasNative) { | |
| 157 statements.add(js.statement(r'''{ | |
| 158 if (typeof receiver != "object") return receiver; | |
| 159 if (receiver instanceof #) return receiver; | |
| 160 return #(receiver); | |
| 161 }''', [ | |
| 162 namer.elementAccess(compiler.objectClass), | |
| 163 namer.elementAccess(backend.getNativeInterceptorMethod)])); | |
| 164 | |
| 165 } else { | |
| 166 ClassElement jsUnknown = backend.jsUnknownJavaScriptObjectClass; | |
| 167 if (compiler.codegenWorld.instantiatedClasses.contains(jsUnknown)) { | |
| 168 statements.add( | |
| 169 js.statement('if (!(receiver instanceof #)) return #;', | |
| 170 [namer.elementAccess(compiler.objectClass), | |
| 171 interceptorFor(jsUnknown)])); | |
| 172 } | |
| 173 | |
| 174 statements.add(js.statement('return receiver')); | |
| 175 } | |
| 176 | |
| 177 buffer.write(jsAst.prettyPrint( | |
| 178 js('''${namer.globalObjectFor(backend.interceptorsLibrary)}.# = | |
| 179 function(receiver) { #; }''', | |
| 180 [key, statements]), | |
| 181 compiler)); | |
| 182 buffer.write(N); | |
| 183 } | |
| 184 | |
| 185 /** | |
| 186 * Emit all versions of the [:getInterceptor:] method. | |
| 187 */ | |
| 188 void emitGetInterceptorMethods(CodeBuffer buffer) { | |
| 189 emitter.addComment('getInterceptor methods', buffer); | |
| 190 Map<String, Set<ClassElement>> specializedGetInterceptors = | |
| 191 backend.specializedGetInterceptors; | |
| 192 for (String name in specializedGetInterceptors.keys.toList()..sort()) { | |
| 193 Set<ClassElement> classes = specializedGetInterceptors[name]; | |
| 194 emitGetInterceptorMethod(buffer, name, classes); | |
| 195 } | |
| 196 } | |
| 197 | |
| 198 // Returns a statement that takes care of performance critical | |
| 199 // common case for a one-shot interceptor, or null if there is no | |
| 200 // fast path. | |
| 201 jsAst.Statement fastPathForOneShotInterceptor(Selector selector, | |
| 202 Set<ClassElement> classes) { | |
| 203 | |
| 204 if (selector.isOperator) { | |
| 205 String name = selector.name; | |
| 206 if (name == '==') { | |
| 207 return js.statement('''{ | |
| 208 if (receiver == null) return a0 == null; | |
| 209 if (typeof receiver != "object") | |
| 210 return a0 != null && receiver === a0; | |
| 211 }'''); | |
| 212 } | |
| 213 if (!classes.contains(backend.jsIntClass) | |
| 214 && !classes.contains(backend.jsNumberClass) | |
| 215 && !classes.contains(backend.jsDoubleClass)) { | |
| 216 return null; | |
| 217 } | |
| 218 if (selector.argumentCount == 1) { | |
| 219 // The following operators do not map to a JavaScript operator. | |
| 220 if (name == '~/' || name == '<<' || name == '%' || name == '>>') { | |
| 221 return null; | |
| 222 } | |
| 223 jsAst.Expression result = js('receiver $name a0'); | |
| 224 if (name == '&' || name == '|' || name == '^') { | |
| 225 result = js('# >>> 0', result); | |
| 226 } | |
| 227 return js.statement( | |
| 228 'if (typeof receiver == "number" && typeof a0 == "number")' | |
| 229 ' return #;', | |
| 230 result); | |
| 231 } else if (name == 'unary-') { | |
| 232 return js.statement( | |
| 233 'if (typeof receiver == "number") return -receiver'); | |
| 234 } else { | |
| 235 assert(name == '~'); | |
| 236 return js.statement(''' | |
| 237 if (typeof receiver == "number" && Math.floor(receiver) == receiver) | |
| 238 return (~receiver) >>> 0; | |
| 239 '''); | |
| 240 } | |
| 241 } else if (selector.isIndex || selector.isIndexSet) { | |
| 242 // For an index operation, this code generates: | |
| 243 // | |
| 244 // if (receiver.constructor == Array || typeof receiver == "string") { | |
| 245 // if (a0 >>> 0 === a0 && a0 < receiver.length) { | |
| 246 // return receiver[a0]; | |
| 247 // } | |
| 248 // } | |
| 249 // | |
| 250 // For an index set operation, this code generates: | |
| 251 // | |
| 252 // if (receiver.constructor == Array && !receiver.immutable$list) { | |
| 253 // if (a0 >>> 0 === a0 && a0 < receiver.length) { | |
| 254 // return receiver[a0] = a1; | |
| 255 // } | |
| 256 // } | |
| 257 bool containsArray = classes.contains(backend.jsArrayClass); | |
| 258 bool containsString = classes.contains(backend.jsStringClass); | |
| 259 bool containsJsIndexable = | |
| 260 backend.jsIndexingBehaviorInterface.isResolved && classes.any((cls) { | |
| 261 return compiler.world.isSubtypeOf(cls, | |
| 262 backend.jsIndexingBehaviorInterface); | |
| 263 }); | |
| 264 // The index set operator requires a check on its set value in | |
| 265 // checked mode, so we don't optimize the interceptor if the | |
| 266 // compiler has type assertions enabled. | |
| 267 if (selector.isIndexSet | |
| 268 && (compiler.enableTypeAssertions || !containsArray)) { | |
| 269 return null; | |
| 270 } | |
| 271 if (!containsArray && !containsString) { | |
| 272 return null; | |
| 273 } | |
| 274 jsAst.Expression arrayCheck = js('receiver.constructor == Array'); | |
| 275 jsAst.Expression indexableCheck = | |
| 276 backend.generateIsJsIndexableCall(js('receiver'), js('receiver')); | |
| 277 | |
| 278 jsAst.Expression orExp(left, right) { | |
| 279 return left == null ? right : js('# || #', [left, right]); | |
| 280 } | |
| 281 | |
| 282 if (selector.isIndex) { | |
| 283 jsAst.Expression typeCheck; | |
| 284 if (containsArray) { | |
| 285 typeCheck = arrayCheck; | |
| 286 } | |
| 287 | |
| 288 if (containsString) { | |
| 289 typeCheck = orExp(typeCheck, js('typeof receiver == "string"')); | |
| 290 } | |
| 291 | |
| 292 if (containsJsIndexable) { | |
| 293 typeCheck = orExp(typeCheck, indexableCheck); | |
| 294 } | |
| 295 | |
| 296 return js.statement(''' | |
| 297 if (#) | |
| 298 if ((a0 >>> 0) === a0 && a0 < receiver.length) | |
| 299 return receiver[a0]; | |
| 300 ''', typeCheck); | |
| 301 } else { | |
| 302 jsAst.Expression typeCheck; | |
| 303 if (containsArray) { | |
| 304 typeCheck = arrayCheck; | |
| 305 } | |
| 306 | |
| 307 if (containsJsIndexable) { | |
| 308 typeCheck = orExp(typeCheck, indexableCheck); | |
| 309 } | |
| 310 | |
| 311 return js.statement(r''' | |
| 312 if (# && !receiver.immutable$list && | |
| 313 (a0 >>> 0) === a0 && a0 < receiver.length) | |
| 314 return receiver[a0] = a1; | |
| 315 ''', typeCheck); | |
| 316 } | |
| 317 } | |
| 318 return null; | |
| 319 } | |
| 320 | |
| 321 void emitOneShotInterceptors(CodeBuffer buffer) { | |
| 322 List<String> names = backend.oneShotInterceptors.keys.toList(); | |
| 323 names.sort(); | |
| 324 for (String name in names) { | |
| 325 Selector selector = backend.oneShotInterceptors[name]; | |
| 326 Set<ClassElement> classes = | |
| 327 backend.getInterceptedClassesOn(selector.name); | |
| 328 String getInterceptorName = | |
| 329 namer.getInterceptorName(backend.getInterceptorMethod, classes); | |
| 330 | |
| 331 List<String> parameterNames = <String>[]; | |
| 332 parameterNames.add('receiver'); | |
| 333 | |
| 334 if (selector.isSetter) { | |
| 335 parameterNames.add('value'); | |
| 336 } else { | |
| 337 for (int i = 0; i < selector.argumentCount; i++) { | |
| 338 parameterNames.add('a$i'); | |
| 339 } | |
| 340 } | |
| 341 | |
| 342 String invocationName = backend.namer.invocationName(selector); | |
| 343 String globalObject = namer.globalObjectFor(backend.interceptorsLibrary); | |
| 344 | |
| 345 jsAst.Statement optimizedPath = | |
| 346 fastPathForOneShotInterceptor(selector, classes); | |
| 347 if (optimizedPath == null) optimizedPath = js.statement(';'); | |
| 348 | |
| 349 jsAst.Expression assignment = js('${globalObject}.# = function(#) {' | |
| 350 ' #;' | |
| 351 ' return #.#(receiver).#(#) }', | |
| 352 [name, parameterNames, | |
| 353 optimizedPath, | |
| 354 globalObject, getInterceptorName, invocationName, parameterNames]); | |
| 355 | |
| 356 buffer.write(jsAst.prettyPrint(assignment, compiler)); | |
| 357 buffer.write(N); | |
| 358 } | |
| 359 } | |
| 360 | |
| 361 /** | |
| 362 * If [JSInvocationMirror._invokeOn] has been compiled, emit all the | |
| 363 * possible selector names that are intercepted into the | |
| 364 * [interceptedNames] top-level variable. The implementation of | |
| 365 * [_invokeOn] will use it to determine whether it should call the | |
| 366 * method with an extra parameter. | |
| 367 */ | |
| 368 void emitInterceptedNames(CodeBuffer buffer) { | |
| 369 // TODO(ahe): We should not generate the list of intercepted names at | |
| 370 // compile time, it can be generated automatically at runtime given | |
| 371 // subclasses of Interceptor (which can easily be identified). | |
| 372 if (!compiler.enabledInvokeOn) return; | |
| 373 | |
| 374 // TODO(ahe): We should roll this into | |
| 375 // [emitStaticNonFinalFieldInitializations]. | |
| 376 String name = backend.namer.getNameOfGlobalField(backend.interceptedNames); | |
| 377 | |
| 378 int index = 0; | |
| 379 var invocationNames = interceptorInvocationNames.toList()..sort(); | |
| 380 List<jsAst.ArrayElement> elements = invocationNames.map( | |
| 381 (String invocationName) { | |
| 382 jsAst.Literal str = js.string(invocationName); | |
| 383 return new jsAst.ArrayElement(index++, str); | |
| 384 }).toList(); | |
| 385 jsAst.ArrayInitializer array = | |
| 386 new jsAst.ArrayInitializer(invocationNames.length, elements); | |
| 387 | |
| 388 jsAst.Expression assignment = | |
| 389 js('${emitter.isolateProperties}.# = #', [name, array]); | |
| 390 | |
| 391 buffer.write(jsAst.prettyPrint(assignment, compiler)); | |
| 392 buffer.write(N); | |
| 393 } | |
| 394 | |
| 395 /** | |
| 396 * Emit initializer for [mapTypeToInterceptor] data structure used by | |
| 397 * [findInterceptorForType]. See declaration of [mapTypeToInterceptor] in | |
| 398 * `interceptors.dart`. | |
| 399 */ | |
| 400 void emitMapTypeToInterceptor(CodeBuffer buffer) { | |
| 401 // TODO(sra): Perhaps inject a constant instead? | |
| 402 CustomElementsAnalysis analysis = backend.customElementsAnalysis; | |
| 403 if (!analysis.needsTable) return; | |
| 404 | |
| 405 List<jsAst.Expression> elements = <jsAst.Expression>[]; | |
| 406 JavaScriptConstantCompiler handler = backend.constants; | |
| 407 List<Constant> constants = | |
| 408 handler.getConstantsForEmission(emitter.compareConstants); | |
| 409 for (Constant constant in constants) { | |
| 410 if (constant is TypeConstant) { | |
| 411 TypeConstant typeConstant = constant; | |
| 412 Element element = typeConstant.representedType.element; | |
| 413 if (element is ClassElement) { | |
| 414 ClassElement classElement = element; | |
| 415 if (!analysis.needsClass(classElement)) continue; | |
| 416 | |
| 417 elements.add(emitter.constantReference(constant)); | |
| 418 elements.add(namer.elementAccess(classElement)); | |
| 419 | |
| 420 // Create JavaScript Object map for by-name lookup of generative | |
| 421 // constructors. For example, the class A has three generative | |
| 422 // constructors | |
| 423 // | |
| 424 // class A { | |
| 425 // A() {} | |
| 426 // A.foo() {} | |
| 427 // A.bar() {} | |
| 428 // } | |
| 429 // | |
| 430 // Which are described by the map | |
| 431 // | |
| 432 // {"": A.A$, "foo": A.A$foo, "bar": A.A$bar} | |
| 433 // | |
| 434 // We expect most of the time the map will be a singleton. | |
| 435 var properties = []; | |
| 436 for (Element member in analysis.constructors(classElement)) { | |
| 437 properties.add( | |
| 438 new jsAst.Property( | |
| 439 js.string(member.name), | |
| 440 backend.namer.elementAccess(member))); | |
| 441 } | |
| 442 | |
| 443 var map = new jsAst.ObjectInitializer(properties); | |
| 444 elements.add(map); | |
| 445 } | |
| 446 } | |
| 447 } | |
| 448 | |
| 449 jsAst.ArrayInitializer array = new jsAst.ArrayInitializer.from(elements); | |
| 450 String name = | |
| 451 backend.namer.getNameOfGlobalField(backend.mapTypeToInterceptor); | |
| 452 jsAst.Expression assignment = | |
| 453 js('${emitter.isolateProperties}.# = #', [name, array]); | |
| 454 | |
| 455 buffer.write(jsAst.prettyPrint(assignment, compiler)); | |
| 456 buffer.write(N); | |
| 457 } | |
| 458 } | |
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Chromium Code Reviews
Issue 602663002:
Split interceptor emitter. (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart