| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| part of dart2js.js_emitter; |
| |
| /** |
| * Generates the code for all used classes in the program. Static fields (even |
| * in classes) are ignored, since they can be treated as non-class elements. |
| * |
| * The code for the containing (used) methods must exist in the [:universe:]. |
| */ |
| class CodeEmitterTask extends CompilerTask { |
| final ContainerBuilder containerBuilder = new ContainerBuilder(); |
| final ClassEmitter classEmitter = new ClassEmitter(); |
| final NsmEmitter nsmEmitter = new NsmEmitter(); |
| final TypeTestEmitter typeTestEmitter = new TypeTestEmitter(); |
| final InterceptorEmitter interceptorEmitter = new InterceptorEmitter(); |
| final MetadataEmitter metadataEmitter = new MetadataEmitter(); |
| |
| bool needsDefineClass = false; |
| bool needsMixinSupport = false; |
| bool needsLazyInitializer = false; |
| final Namer namer; |
| ConstantEmitter constantEmitter; |
| NativeEmitter nativeEmitter; |
| Map<OutputUnit, CodeBuffer> outputBuffers = new Map<OutputUnit, CodeBuffer>(); |
| final CodeBuffer deferredConstants = new CodeBuffer(); |
| /** Shorter access to [isolatePropertiesName]. Both here in the code, as |
| well as in the generated code. */ |
| String isolateProperties; |
| String classesCollector; |
| final Set<ClassElement> neededClasses = new Set<ClassElement>(); |
| final Map<OutputUnit, List<ClassElement>> outputClassLists = |
| new Map<OutputUnit, List<ClassElement>>(); |
| final List<ClassElement> nativeClasses = <ClassElement>[]; |
| final Map<String, String> mangledFieldNames = <String, String>{}; |
| final Map<String, String> mangledGlobalFieldNames = <String, String>{}; |
| final Set<String> recordedMangledNames = new Set<String>(); |
| |
| final Map<ClassElement, Map<String, jsAst.Expression>> additionalProperties = |
| new Map<ClassElement, Map<String, jsAst.Expression>>(); |
| |
| /// Records if a type variable is read dynamically for type tests. |
| final Set<TypeVariableElement> readTypeVariables = |
| new Set<TypeVariableElement>(); |
| |
| // TODO(ngeoffray): remove this field. |
| Set<ClassElement> instantiatedClasses; |
| |
| JavaScriptBackend get backend => compiler.backend; |
| TypeVariableHandler get typeVariableHandler => backend.typeVariableHandler; |
| |
| String get _ => space; |
| String get space => compiler.enableMinification ? "" : " "; |
| String get n => compiler.enableMinification ? "" : "\n"; |
| String get N => compiler.enableMinification ? "\n" : ";\n"; |
| |
| CodeBuffer get mainBuffer { |
| return outputBuffers.putIfAbsent(compiler.deferredLoadTask.mainOutputUnit, |
| () => new CodeBuffer()); |
| } |
| |
| /** |
| * List of expressions and statements that will be included in the |
| * precompiled function. |
| * |
| * To save space, dart2js normally generates constructors and accessors |
| * dynamically. This doesn't work in CSP mode, and may impact startup time |
| * negatively. So dart2js will emit these functions to a separate file that |
| * can be optionally included to support CSP mode or for faster startup. |
| */ |
| List<jsAst.Node> precompiledFunction = <jsAst.Node>[]; |
| |
| List<jsAst.Expression> precompiledConstructorNames = <jsAst.Expression>[]; |
| |
| // True if Isolate.makeConstantList is needed. |
| bool hasMakeConstantList = false; |
| |
| /** |
| * Accumulate properties for classes and libraries, describing their |
| * static/top-level members. |
| * Later, these members are emitted when the class or library is emitted. |
| * |
| * For supporting deferred loading we keep one list per output unit. |
| * |
| * See [getElementDecriptor]. |
| */ |
| // TODO(ahe): Generate statics with their class, and store only libraries in |
| // this map. |
| final Map<Element, Map<OutputUnit, ClassBuilder>> elementDescriptors |
| = new Map<Element, Map<OutputUnit, ClassBuilder>>(); |
| |
| final bool generateSourceMap; |
| |
| CodeEmitterTask(Compiler compiler, Namer namer, this.generateSourceMap) |
| : this.namer = namer, |
| constantEmitter = new ConstantEmitter(compiler, namer), |
| super(compiler) { |
| nativeEmitter = new NativeEmitter(this); |
| containerBuilder.task = this; |
| classEmitter.task = this; |
| nsmEmitter.task = this; |
| typeTestEmitter.task = this; |
| interceptorEmitter.task = this; |
| metadataEmitter.task = this; |
| } |
| |
| void addComment(String comment, CodeBuffer buffer) { |
| buffer.write(jsAst.prettyPrint(js.comment(comment), compiler)); |
| } |
| |
| jsAst.Expression constantReference(Constant value) { |
| return constantEmitter.reference(value); |
| } |
| |
| jsAst.Expression constantInitializerExpression(Constant value) { |
| return constantEmitter.initializationExpression(value); |
| } |
| |
| String get name => 'CodeEmitter'; |
| |
| String get currentGenerateAccessorName |
| => '${namer.currentIsolate}.\$generateAccessor'; |
| String get generateAccessorHolder |
| => '$isolatePropertiesName.\$generateAccessor'; |
| String get finishClassesProperty |
| => r'$finishClasses'; |
| String get finishClassesName |
| => '${namer.isolateName}.$finishClassesProperty'; |
| String get finishIsolateConstructorName |
| => '${namer.isolateName}.\$finishIsolateConstructor'; |
| String get isolatePropertiesName |
| => '${namer.isolateName}.${namer.isolatePropertiesName}'; |
| String get lazyInitializerName |
| => '${namer.isolateName}.\$lazy'; |
| String get initName => 'init'; |
| String get makeConstListProperty |
| => namer.getMappedInstanceName('makeConstantList'); |
| |
| jsAst.FunctionDeclaration get generateAccessorFunction { |
| const RANGE1_SIZE = RANGE1_LAST - RANGE1_FIRST + 1; |
| const RANGE2_SIZE = RANGE2_LAST - RANGE2_FIRST + 1; |
| const RANGE1_ADJUST = - (FIRST_FIELD_CODE - RANGE1_FIRST); |
| const RANGE2_ADJUST = - (FIRST_FIELD_CODE + RANGE1_SIZE - RANGE2_FIRST); |
| const RANGE3_ADJUST = |
| - (FIRST_FIELD_CODE + RANGE1_SIZE + RANGE2_SIZE - RANGE3_FIRST); |
| |
| String receiverParamName = compiler.enableMinification ? "r" : "receiver"; |
| String valueParamName = compiler.enableMinification ? "v" : "value"; |
| String reflectableField = namer.reflectableField; |
| |
| return js.statement(''' |
| function generateAccessor(fieldDescriptor, accessors, cls) { |
| var fieldInformation = fieldDescriptor.split("-"); |
| var field = fieldInformation[0]; |
| var len = field.length; |
| var code = field.charCodeAt(len - 1); |
| var reflectable; |
| if (fieldInformation.length > 1) reflectable = true; |
| else reflectable = false; |
| code = ((code >= $RANGE1_FIRST) && (code <= $RANGE1_LAST)) |
| ? code - $RANGE1_ADJUST |
| : ((code >= $RANGE2_FIRST) && (code <= $RANGE2_LAST)) |
| ? code - $RANGE2_ADJUST |
| : ((code >= $RANGE3_FIRST) && (code <= $RANGE3_LAST)) |
| ? code - $RANGE3_ADJUST |
| : $NO_FIELD_CODE; |
| |
| if (code) { // needsAccessor |
| var getterCode = code & 3; |
| var setterCode = code >> 2; |
| var accessorName = field = field.substring(0, len - 1); |
| |
| var divider = field.indexOf(":"); |
| if (divider > 0) { // Colon never in first position. |
| accessorName = field.substring(0, divider); |
| field = field.substring(divider + 1); |
| } |
| |
| if (getterCode) { // needsGetter |
| var args = (getterCode & 2) ? "$receiverParamName" : ""; |
| var receiver = (getterCode & 1) ? "this" : "$receiverParamName"; |
| var body = "return " + receiver + "." + field; |
| var property = |
| cls + ".prototype.${namer.getterPrefix}" + accessorName + "="; |
| var fn = "function(" + args + "){" + body + "}"; |
| if (reflectable) |
| accessors.push(property + "\$reflectable(" + fn + ");\\n"); |
| else |
| accessors.push(property + fn + ";\\n"); |
| } |
| |
| if (setterCode) { // needsSetter |
| var args = (setterCode & 2) |
| ? "$receiverParamName,${_}$valueParamName" |
| : "$valueParamName"; |
| var receiver = (setterCode & 1) ? "this" : "$receiverParamName"; |
| var body = receiver + "." + field + "$_=$_$valueParamName"; |
| var property = |
| cls + ".prototype.${namer.setterPrefix}" + accessorName + "="; |
| var fn = "function(" + args + "){" + body + "}"; |
| if (reflectable) |
| accessors.push(property + "\$reflectable(" + fn + ");\\n"); |
| else |
| accessors.push(property + fn + ";\\n"); |
| } |
| } |
| |
| return field; |
| }'''); |
| } |
| |
| List get defineClassFunction { |
| // First the class name, then the field names in an array and the members |
| // (inside an Object literal). |
| // The caller can also pass in the constructor as a function if needed. |
| // |
| // Example: |
| // defineClass("A", ["x", "y"], { |
| // foo$1: function(y) { |
| // print(this.x + y); |
| // }, |
| // bar$2: function(t, v) { |
| // this.x = t - v; |
| // }, |
| // }); |
| |
| var defineClass = js('''function(name, cls, fields) { |
| var accessors = []; |
| |
| var str = "function " + cls + "("; |
| var body = ""; |
| |
| for (var i = 0; i < fields.length; i++) { |
| if(i != 0) str += ", "; |
| |
| var field = generateAccessor(fields[i], accessors, cls); |
| var parameter = "parameter_" + field; |
| str += parameter; |
| body += ("this." + field + " = " + parameter + ";\\n"); |
| } |
| str += ") {\\n" + body + "}\\n"; |
| str += cls + ".builtin\$cls=\\"" + name + "\\";\\n"; |
| str += "\$desc=\$collectedClasses." + cls + ";\\n"; |
| str += "if(\$desc instanceof Array) \$desc = \$desc[1];\\n"; |
| str += cls + ".prototype = \$desc;\\n"; |
| if (typeof defineClass.name != "string") { |
| str += cls + ".name=\\"" + cls + "\\";\\n"; |
| } |
| str += accessors.join(""); |
| |
| return str; |
| }'''); |
| // Declare a function called "generateAccessor". This is used in |
| // defineClassFunction (it's a local declaration in init()). |
| return [ |
| generateAccessorFunction, |
| js('$generateAccessorHolder = generateAccessor'), |
| new jsAst.FunctionDeclaration( |
| new jsAst.VariableDeclaration('defineClass'), defineClass) ]; |
| } |
| |
| /** Needs defineClass to be defined. */ |
| List buildInheritFrom() { |
| return [js(r''' |
| var inheritFrom = function() { |
| function tmp() {} |
| var hasOwnProperty = Object.prototype.hasOwnProperty; |
| return function (constructor, superConstructor) { |
| tmp.prototype = superConstructor.prototype; |
| var object = new tmp(); |
| var properties = constructor.prototype; |
| for (var member in properties) |
| if (hasOwnProperty.call(properties, member)) |
| object[member] = properties[member]; |
| object.constructor = constructor; |
| constructor.prototype = object; |
| return object; |
| }; |
| }() |
| ''')]; |
| } |
| |
| jsAst.Fun get finishClassesFunction { |
| // Class descriptions are collected in a JS object. |
| // 'finishClasses' takes all collected descriptions and sets up |
| // the prototype. |
| // Once set up, the constructors prototype field satisfy: |
| // - it contains all (local) members. |
| // - its internal prototype (__proto__) points to the superclass' |
| // prototype field. |
| // - the prototype's constructor field points to the JavaScript |
| // constructor. |
| // For engines where we have access to the '__proto__' we can manipulate |
| // the object literal directly. For other engines we have to create a new |
| // object and copy over the members. |
| |
| String reflectableField = namer.reflectableField; |
| |
| return js(''' |
| function(collectedClasses, isolateProperties, existingIsolateProperties) { |
| var pendingClasses = {}; |
| if (!init.allClasses) init.allClasses = {}; |
| var allClasses = init.allClasses; |
| |
| if (#) // DEBUG_FAST_OBJECTS |
| print("Number of classes: " + |
| Object.getOwnPropertyNames(\$\$).length); |
| |
| var hasOwnProperty = Object.prototype.hasOwnProperty; |
| |
| if (typeof dart_precompiled == "function") { |
| var constructors = dart_precompiled(collectedClasses); |
| } else { |
| var combinedConstructorFunction = |
| "function \$reflectable(fn){fn.$reflectableField=1;return fn};\\n"+ |
| "var \$desc;\\n"; |
| var constructorsList = []; |
| } |
| |
| for (var cls in collectedClasses) { |
| if (hasOwnProperty.call(collectedClasses, cls)) { |
| var desc = collectedClasses[cls]; |
| if (desc instanceof Array) desc = desc[1]; |
| |
| /* The 'fields' are either a constructor function or a |
| * string encoding fields, constructor and superclass. Get |
| * the superclass and the fields in the format |
| * '[name/]Super;field1,field2' |
| * from the CLASS_DESCRIPTOR_PROPERTY property on the descriptor. |
| * The 'name/' is optional and contains the name that should be used |
| * when printing the runtime type string. It is used, for example, |
| * to print the runtime type JSInt as 'int'. |
| */ |
| var classData = desc["${namer.classDescriptorProperty}"], |
| supr, name = cls, fields = classData; |
| if (#) // backend.hasRetainedMetadata |
| if (typeof classData == "object" && |
| classData instanceof Array) { |
| classData = fields = classData[0]; |
| } |
| if (typeof classData == "string") { |
| var split = classData.split("/"); |
| if (split.length == 2) { |
| name = split[0]; |
| fields = split[1]; |
| } |
| } |
| |
| var s = fields.split(";"); |
| fields = s[1] == "" ? [] : s[1].split(","); |
| supr = s[0]; |
| split = supr.split(":"); |
| if (split.length == 2) { |
| supr = split[0]; |
| var functionSignature = split[1]; |
| if (functionSignature) |
| desc.\$signature = (function(s) { |
| return function(){ return init.metadata[s]; }; |
| })(functionSignature); |
| } |
| |
| if (#) // needsMixinSupport |
| if (supr && supr.indexOf("+") > 0) { |
| s = supr.split("+"); |
| supr = s[0]; |
| var mixin = collectedClasses[s[1]]; |
| if (mixin instanceof Array) mixin = mixin[1]; |
| for(var d in mixin) { |
| if (hasOwnProperty.call(mixin, d) && |
| !hasOwnProperty.call(desc, d)) |
| desc[d] = mixin[d]; |
| } |
| } |
| |
| if (typeof dart_precompiled != "function") { |
| combinedConstructorFunction += defineClass(name, cls, fields); |
| constructorsList.push(cls); |
| } |
| if (supr) pendingClasses[cls] = supr; |
| } |
| } |
| |
| if (typeof dart_precompiled != "function") { |
| combinedConstructorFunction += |
| "return [\\n " + constructorsList.join(",\\n ") + "\\n]"; |
| var constructors = |
| new Function("\$collectedClasses", combinedConstructorFunction) |
| (collectedClasses); |
| combinedConstructorFunction = null; |
| } |
| |
| for (var i = 0; i < constructors.length; i++) { |
| var constructor = constructors[i]; |
| var cls = constructor.name; |
| var desc = collectedClasses[cls]; |
| var globalObject = isolateProperties; |
| if (desc instanceof Array) { |
| globalObject = desc[0] || isolateProperties; |
| desc = desc[1]; |
| } |
| if (#) //backend.isTreeShakingDisabled, |
| constructor["${namer.metadataField}"] = desc; |
| allClasses[cls] = constructor; |
| globalObject[cls] = constructor; |
| } |
| |
| constructors = null; |
| |
| var finishedClasses = {}; |
| init.interceptorsByTag = Object.create(null); |
| init.leafTags = {}; |
| |
| #; // buildFinishClass(), |
| |
| #; // buildTrivialNsmHandlers() |
| |
| for (var cls in pendingClasses) finishClass(cls); |
| }''', [ |
| DEBUG_FAST_OBJECTS, |
| backend.hasRetainedMetadata, |
| needsMixinSupport, |
| backend.isTreeShakingDisabled, |
| buildFinishClass(), |
| nsmEmitter.buildTrivialNsmHandlers()]); |
| } |
| |
| jsAst.Node optional(bool condition, jsAst.Node node) { |
| return condition ? node : new jsAst.EmptyStatement(); |
| } |
| |
| jsAst.FunctionDeclaration buildFinishClass() { |
| String specProperty = '"${namer.nativeSpecProperty}"'; // "%" |
| |
| return js.statement(''' |
| function finishClass(cls) { |
| |
| // TODO(8540): Remove this work around. |
| // Opera does not support 'getOwnPropertyNames'. Therefore we use |
| // hasOwnProperty instead. |
| var hasOwnProperty = Object.prototype.hasOwnProperty; |
| |
| if (hasOwnProperty.call(finishedClasses, cls)) return; |
| |
| finishedClasses[cls] = true; |
| |
| var superclass = pendingClasses[cls]; |
| |
| // The superclass is only false (empty string) for the Dart Object |
| // class. The minifier together with noSuchMethod can put methods on |
| // the Object.prototype object, and they show through here, so we check |
| // that we have a string. |
| if (!superclass || typeof superclass != "string") return; |
| finishClass(superclass); |
| var constructor = allClasses[cls]; |
| var superConstructor = allClasses[superclass]; |
| |
| if (!superConstructor) |
| superConstructor = existingIsolateProperties[superclass]; |
| |
| var prototype = inheritFrom(constructor, superConstructor); |
| |
| if (#) { // !nativeClasses.isEmpty, |
| // The property looks like this: |
| // |
| // HtmlElement: { |
| // "%": "HTMLDivElement|HTMLAnchorElement;HTMLElement;FancyButton" |
| // |
| // The first two semicolon-separated parts contain dispatch tags, the |
| // third contains the JavaScript names for classes. |
| // |
| // The tags indicate that JavaScript objects with the dispatch tags |
| // (usually constructor names) HTMLDivElement, HTMLAnchorElement and |
| // HTMLElement all map to the Dart native class named HtmlElement. |
| // The first set is for effective leaf nodes in the hierarchy, the |
| // second set is non-leaf nodes. |
| // |
| // The third part contains the JavaScript names of Dart classes that |
| // extend the native class. Here, FancyButton extends HtmlElement, so |
| // the runtime needs to know that window.HTMLElement.prototype is the |
| // prototype that needs to be extended in creating the custom element. |
| // |
| // The information is used to build tables referenced by |
| // getNativeInterceptor and custom element support. |
| if (hasOwnProperty.call(prototype, $specProperty)) { |
| var nativeSpec = prototype[$specProperty].split(";"); |
| if (nativeSpec[0]) { |
| var tags = nativeSpec[0].split("|"); |
| for (var i = 0; i < tags.length; i++) { |
| init.interceptorsByTag[tags[i]] = constructor; |
| init.leafTags[tags[i]] = true; |
| } |
| } |
| if (nativeSpec[1]) { |
| tags = nativeSpec[1].split("|"); |
| if (#) { // User subclassing of native classes? |
| if (nativeSpec[2]) { |
| var subclasses = nativeSpec[2].split("|"); |
| for (var i = 0; i < subclasses.length; i++) { |
| var subclass = allClasses[subclasses[i]]; |
| subclass.\$nativeSuperclassTag = tags[0]; |
| } |
| } |
| for (i = 0; i < tags.length; i++) { |
| init.interceptorsByTag[tags[i]] = constructor; |
| init.leafTags[tags[i]] = false; |
| } |
| } |
| } |
| } |
| } |
| }''', [!nativeClasses.isEmpty, true]); |
| } |
| |
| jsAst.Fun get finishIsolateConstructorFunction { |
| // We replace the old Isolate function with a new one that initializes |
| // all its fields with the initial (and often final) value of all globals. |
| // |
| // We also copy over old values like the prototype, and the |
| // isolateProperties themselves. |
| return js(''' |
| function (oldIsolate) { |
| var isolateProperties = oldIsolate.${namer.isolatePropertiesName}; |
| function Isolate() { |
| var hasOwnProperty = Object.prototype.hasOwnProperty; |
| for (var staticName in isolateProperties) |
| if (hasOwnProperty.call(isolateProperties, staticName)) |
| this[staticName] = isolateProperties[staticName]; |
| // Use the newly created object as prototype. In Chrome, |
| // this creates a hidden class for the object and makes |
| // sure it is fast to access. |
| function ForceEfficientMap() {} |
| ForceEfficientMap.prototype = this; |
| new ForceEfficientMap(); |
| } |
| Isolate.prototype = oldIsolate.prototype; |
| Isolate.prototype.constructor = Isolate; |
| Isolate.${namer.isolatePropertiesName} = isolateProperties; |
| if (#) |
| Isolate.$finishClassesProperty = oldIsolate.$finishClassesProperty; |
| if (#) |
| Isolate.$makeConstListProperty = oldIsolate.$makeConstListProperty; |
| return Isolate; |
| }''', |
| [ needsDefineClass, hasMakeConstantList ]); |
| } |
| |
| jsAst.Fun get lazyInitializerFunction { |
| String isolate = namer.currentIsolate; |
| jsAst.Expression cyclicThrow = |
| namer.elementAccess(backend.getCyclicThrowHelper()); |
| |
| return js(''' |
| function (prototype, staticName, fieldName, getterName, lazyValue) { |
| if (#) { |
| if (!init.lazies) init.lazies = {}; |
| init.lazies[fieldName] = getterName; |
| } |
| |
| var sentinelUndefined = {}; |
| var sentinelInProgress = {}; |
| prototype[fieldName] = sentinelUndefined; |
| |
| prototype[getterName] = function () { |
| var result = $isolate[fieldName]; |
| try { |
| if (result === sentinelUndefined) { |
| $isolate[fieldName] = sentinelInProgress; |
| |
| try { |
| result = $isolate[fieldName] = lazyValue(); |
| } finally { |
| // Use try-finally, not try-catch/throw as it destroys the |
| // stack trace. |
| if (result === sentinelUndefined) |
| if ($isolate[fieldName] === sentinelInProgress) |
| $isolate[fieldName] = null; |
| } |
| } else { |
| if (result === sentinelInProgress) |
| #(staticName); |
| } |
| |
| return result; |
| } finally { |
| $isolate[getterName] = function() { return this[fieldName]; }; |
| } |
| } |
| } |
| ''', [backend.rememberLazies, cyclicThrow]); |
| } |
| |
| List buildDefineClassAndFinishClassFunctionsIfNecessary() { |
| if (!needsDefineClass) return []; |
| return defineClassFunction |
| ..addAll(buildInheritFrom()) |
| ..addAll([ |
| js('$finishClassesName = #', finishClassesFunction) |
| ]); |
| } |
| |
| List buildLazyInitializerFunctionIfNecessary() { |
| if (!needsLazyInitializer) return []; |
| |
| return [js('# = #', [js(lazyInitializerName), lazyInitializerFunction])]; |
| } |
| |
| List buildFinishIsolateConstructor() { |
| return [ |
| js('$finishIsolateConstructorName = #', finishIsolateConstructorFunction) |
| ]; |
| } |
| |
| void emitFinishIsolateConstructorInvocation(CodeBuffer buffer) { |
| String isolate = namer.isolateName; |
| buffer.write("$isolate = $finishIsolateConstructorName($isolate)$N"); |
| } |
| |
| /// In minified mode we want to keep the name for the most common core types. |
| bool _isNativeTypeNeedingReflectionName(Element element) { |
| if (!element.isClass()) return false; |
| return (element == compiler.intClass || |
| element == compiler.doubleClass || |
| element == compiler.numClass || |
| element == compiler.stringClass || |
| element == compiler.boolClass || |
| element == compiler.nullClass || |
| element == compiler.listClass); |
| } |
| |
| /// Returns the "reflection name" of an [Element] or [Selector]. |
| /// The reflection name of a getter 'foo' is 'foo'. |
| /// The reflection name of a setter 'foo' is 'foo='. |
| /// The reflection name of a method 'foo' is 'foo:N:M:O', where N is the |
| /// number of required arguments, M is the number of optional arguments, and |
| /// O is the named arguments. |
| /// The reflection name of a constructor is similar to a regular method but |
| /// starts with 'new '. |
| /// The reflection name of class 'C' is 'C'. |
| /// An anonymous mixin application has no reflection name. |
| /// This is used by js_mirrors.dart. |
| String getReflectionName(elementOrSelector, String mangledName) { |
| String name = elementOrSelector.name; |
| if (backend.shouldRetainName(name) || |
| elementOrSelector is Element && |
| // Make sure to retain names of unnamed constructors, and |
| // for common native types. |
| (name == '' && backend.isNeededForReflection(elementOrSelector) || |
| _isNativeTypeNeedingReflectionName(elementOrSelector))) { |
| |
| // TODO(ahe): Enable the next line when I can tell the difference between |
| // an instance method and a global. They may have the same mangled name. |
| // if (recordedMangledNames.contains(mangledName)) return null; |
| recordedMangledNames.add(mangledName); |
| return getReflectionNameInternal(elementOrSelector, mangledName); |
| } |
| return null; |
| } |
| |
| String getReflectionNameInternal(elementOrSelector, String mangledName) { |
| String name = elementOrSelector.name; |
| if (elementOrSelector.isGetter()) return name; |
| if (elementOrSelector.isSetter()) { |
| if (!mangledName.startsWith(namer.setterPrefix)) return '$name='; |
| String base = mangledName.substring(namer.setterPrefix.length); |
| String getter = '${namer.getterPrefix}$base'; |
| mangledFieldNames[getter] = name; |
| recordedMangledNames.add(getter); |
| // TODO(karlklose,ahe): we do not actually need to store information |
| // about the name of this setter in the output, but it is needed for |
| // marking the function as invokable by reflection. |
| return '$name='; |
| } |
| if (elementOrSelector is Element && elementOrSelector.isClosure()) { |
| // Closures are synthesized and their name might conflict with existing |
| // globals. Assign an illegal name, and make sure they don't clash |
| // with each other. |
| return " $mangledName"; |
| } |
| if (elementOrSelector is Selector |
| || elementOrSelector.isFunction() |
| || elementOrSelector.isConstructor()) { |
| int requiredParameterCount; |
| int optionalParameterCount; |
| String namedArguments = ''; |
| bool isConstructor = false; |
| if (elementOrSelector is Selector) { |
| Selector selector = elementOrSelector; |
| requiredParameterCount = selector.argumentCount; |
| optionalParameterCount = 0; |
| namedArguments = namedParametersAsReflectionNames(selector); |
| } else { |
| FunctionElement function = elementOrSelector; |
| if (function.isConstructor()) { |
| isConstructor = true; |
| name = Elements.reconstructConstructorName(function); |
| } |
| FunctionSignature signature = function.functionSignature; |
| requiredParameterCount = signature.requiredParameterCount; |
| optionalParameterCount = signature.optionalParameterCount; |
| if (signature.optionalParametersAreNamed) { |
| var names = []; |
| for (Element e in signature.optionalParameters) { |
| names.add(e.name); |
| } |
| Selector selector = new Selector.call( |
| function.name, |
| function.getLibrary(), |
| requiredParameterCount, |
| names); |
| namedArguments = namedParametersAsReflectionNames(selector); |
| } else { |
| // Named parameters are handled differently by mirrors. For unnamed |
| // parameters, they are actually required if invoked |
| // reflectively. Also, if you have a method c(x) and c([x]) they both |
| // get the same mangled name, so they must have the same reflection |
| // name. |
| requiredParameterCount += optionalParameterCount; |
| optionalParameterCount = 0; |
| } |
| } |
| String suffix = |
| // TODO(ahe): We probably don't need optionalParameterCount in the |
| // reflection name. |
| '$name:$requiredParameterCount:$optionalParameterCount' |
| '$namedArguments'; |
| return (isConstructor) ? 'new $suffix' : suffix; |
| } |
| Element element = elementOrSelector; |
| if (element.isGenerativeConstructorBody()) { |
| return null; |
| } else if (element.isClass()) { |
| ClassElement cls = element; |
| if (cls.isUnnamedMixinApplication) return null; |
| return cls.name; |
| } |
| throw compiler.internalError(element, |
| 'Do not know how to reflect on this $element.'); |
| } |
| |
| String namedParametersAsReflectionNames(Selector selector) { |
| if (selector.getOrderedNamedArguments().isEmpty) return ''; |
| String names = selector.getOrderedNamedArguments().join(':'); |
| return ':$names'; |
| } |
| |
| jsAst.FunctionDeclaration buildPrecompiledFunction() { |
| // TODO(ahe): Compute a hash code. |
| return js.statement(''' |
| function dart_precompiled(\$collectedClasses) { |
| var \$desc; |
| #; |
| return #; |
| }''', [ |
| precompiledFunction, |
| new jsAst.ArrayInitializer.from(precompiledConstructorNames)]); |
| } |
| |
| void generateClass(ClassElement classElement, ClassBuilder properties) { |
| compiler.withCurrentElement(classElement, () { |
| classEmitter.generateClass( |
| classElement, properties, additionalProperties[classElement]); |
| }); |
| } |
| |
| /** |
| * Return a function that returns true if its argument is a class |
| * that needs to be emitted. |
| */ |
| Function computeClassFilter() { |
| if (backend.isTreeShakingDisabled) return (ClassElement cls) => true; |
| |
| Set<ClassElement> unneededClasses = new Set<ClassElement>(); |
| // The [Bool] class is not marked as abstract, but has a factory |
| // constructor that always throws. We never need to emit it. |
| unneededClasses.add(compiler.boolClass); |
| |
| // Go over specialized interceptors and then constants to know which |
| // interceptors are needed. |
| Set<ClassElement> needed = new Set<ClassElement>(); |
| backend.specializedGetInterceptors.forEach( |
| (_, Iterable<ClassElement> elements) { |
| needed.addAll(elements); |
| } |
| ); |
| |
| // Add interceptors referenced by constants. |
| needed.addAll(interceptorEmitter.interceptorsReferencedFromConstants()); |
| |
| // Add unneeded interceptors to the [unneededClasses] set. |
| for (ClassElement interceptor in backend.interceptedClasses) { |
| if (!needed.contains(interceptor) |
| && interceptor != compiler.objectClass) { |
| unneededClasses.add(interceptor); |
| } |
| } |
| |
| // These classes are just helpers for the backend's type system. |
| unneededClasses.add(backend.jsMutableArrayClass); |
| unneededClasses.add(backend.jsFixedArrayClass); |
| unneededClasses.add(backend.jsExtendableArrayClass); |
| unneededClasses.add(backend.jsUInt32Class); |
| unneededClasses.add(backend.jsUInt31Class); |
| unneededClasses.add(backend.jsPositiveIntClass); |
| unneededClasses.add(compiler.dynamicClass); |
| |
| return (ClassElement cls) => !unneededClasses.contains(cls); |
| } |
| |
| void emitFinishClassesInvocationIfNecessary(CodeBuffer buffer) { |
| if (needsDefineClass) { |
| buffer.write('$finishClassesName($classesCollector,' |
| '$_$isolateProperties,' |
| '${_}null)$N'); |
| |
| // Reset the map. |
| buffer.write("$classesCollector$_=${_}null$N$n"); |
| } |
| } |
| |
| void emitStaticFunctions() { |
| bool isStaticFunction(Element element) => |
| !element.isInstanceMember() && !element.isField(); |
| |
| Iterable<Element> elements = |
| backend.generatedCode.keys.where(isStaticFunction); |
| |
| for (Element element in Elements.sortedByPosition(elements)) { |
| ClassBuilder builder = new ClassBuilder(namer); |
| containerBuilder.addMember(element, builder); |
| getElementDecriptor(element).properties.addAll(builder.properties); |
| } |
| } |
| |
| void emitStaticNonFinalFieldInitializations(CodeBuffer buffer) { |
| JavaScriptConstantCompiler handler = backend.constants; |
| Iterable<VariableElement> staticNonFinalFields = |
| handler.getStaticNonFinalFieldsForEmission(); |
| for (Element element in Elements.sortedByPosition(staticNonFinalFields)) { |
| // [:interceptedNames:] is handled in [emitInterceptedNames]. |
| if (element == backend.interceptedNames) continue; |
| // `mapTypeToInterceptor` is handled in [emitMapTypeToInterceptor]. |
| if (element == backend.mapTypeToInterceptor) continue; |
| compiler.withCurrentElement(element, () { |
| Constant initialValue = handler.getInitialValueFor(element); |
| jsAst.Expression init = |
| js('$isolateProperties.# = #', |
| [namer.getNameOfGlobalField(element), |
| constantEmitter.referenceInInitializationContext(initialValue)]); |
| buffer.write(jsAst.prettyPrint(init, compiler)); |
| buffer.write('$N'); |
| }); |
| } |
| } |
| |
| void emitLazilyInitializedStaticFields(CodeBuffer buffer) { |
| JavaScriptConstantCompiler handler = backend.constants; |
| List<VariableElement> lazyFields = |
| handler.getLazilyInitializedFieldsForEmission(); |
| if (!lazyFields.isEmpty) { |
| needsLazyInitializer = true; |
| for (VariableElement element in Elements.sortedByPosition(lazyFields)) { |
| jsAst.Expression code = backend.generatedCode[element]; |
| // The code is null if we ended up not needing the lazily |
| // initialized field after all because of constant folding |
| // before code generation. |
| if (code == null) continue; |
| // The code only computes the initial value. We build the lazy-check |
| // here: |
| // lazyInitializer(prototype, 'name', fieldName, getterName, initial); |
| // The name is used for error reporting. The 'initial' must be a |
| // closure that constructs the initial value. |
| jsAst.Expression getter = buildLazyInitializedGetter(element); |
| jsAst.Expression init = js('#(#,#,#,#,#,#)', |
| [js(lazyInitializerName), |
| js(isolateProperties), |
| js.string(element.name), |
| js.string(namer.getNameX(element)), |
| js.string(namer.getLazyInitializerName(element)), |
| code, |
| getter == null ? [] : [getter]]); |
| buffer.write(jsAst.prettyPrint(init, compiler)); |
| buffer.write("$N"); |
| } |
| } |
| } |
| |
| jsAst.Expression buildLazyInitializedGetter(VariableElement element) { |
| // Nothing to do, the 'lazy' function will create the getter. |
| return null; |
| } |
| |
| void emitCompileTimeConstants(CodeBuffer buffer, OutputUnit outputUnit) { |
| JavaScriptConstantCompiler handler = backend.constants; |
| List<Constant> constants = handler.getConstantsForEmission( |
| compareConstants); |
| Set<Constant> outputUnitConstants = null; |
| // TODO(sigurdm): We shouldn't run through all constants for every |
| // outputUnit. |
| for (Constant constant in constants) { |
| if (isConstantInlinedOrAlreadyEmitted(constant)) continue; |
| OutputUnit constantUnit = |
| compiler.deferredLoadTask.outputUnitForConstant(constant); |
| if (constantUnit != outputUnit && constantUnit != null) continue; |
| if (outputUnit != compiler.deferredLoadTask.mainOutputUnit |
| && constantUnit == null) { |
| // The back-end introduces some constants, like "InterceptorConstant" or |
| // some list constants. They are emitted in the main output-unit, and |
| // ignored otherwise. |
| // TODO(sigurdm): We should track those constants. |
| continue; |
| } |
| |
| String name = namer.constantName(constant); |
| if (constant.isList) emitMakeConstantListIfNotEmitted(buffer); |
| jsAst.Expression init = js('#.# = #', |
| [namer.globalObjectForConstant(constant), name, |
| constantInitializerExpression(constant)]); |
| buffer.write(jsAst.prettyPrint(init, compiler)); |
| buffer.write('$N'); |
| } |
| } |
| |
| bool isConstantInlinedOrAlreadyEmitted(Constant constant) { |
| if (constant.isFunction) return true; // Already emitted. |
| if (constant.isPrimitive) return true; // Inlined. |
| if (constant.isDummy) return true; // Inlined. |
| // The name is null when the constant is already a JS constant. |
| // TODO(floitsch): every constant should be registered, so that we can |
| // share the ones that take up too much space (like some strings). |
| if (namer.constantName(constant) == null) return true; |
| return false; |
| } |
| |
| int compareConstants(Constant a, Constant b) { |
| // Inlined constants don't affect the order and sometimes don't even have |
| // names. |
| int cmp1 = isConstantInlinedOrAlreadyEmitted(a) ? 0 : 1; |
| int cmp2 = isConstantInlinedOrAlreadyEmitted(b) ? 0 : 1; |
| if (cmp1 + cmp2 < 2) return cmp1 - cmp2; |
| |
| // Emit constant interceptors first. Constant interceptors for primitives |
| // might be used by code that builds other constants. See Issue 18173. |
| if (a.isInterceptor != b.isInterceptor) { |
| return a.isInterceptor ? -1 : 1; |
| } |
| |
| // Sorting by the long name clusters constants with the same constructor |
| // which compresses a tiny bit better. |
| int r = namer.constantLongName(a).compareTo(namer.constantLongName(b)); |
| if (r != 0) return r; |
| // Resolve collisions in the long name by using the constant name (i.e. JS |
| // name) which is unique. |
| return namer.constantName(a).compareTo(namer.constantName(b)); |
| } |
| |
| void emitMakeConstantListIfNotEmitted(CodeBuffer buffer) { |
| if (hasMakeConstantList) return; |
| hasMakeConstantList = true; |
| jsAst.Statement value = new jsAst.ExpressionStatement(new jsAst.Assignment( |
| new jsAst.PropertyAccess.field( |
| new jsAst.VariableUse(namer.isolateName), |
| makeConstListProperty), |
| js('''function(list) { |
| list.immutable\$list = $initName; |
| list.fixed\$length = $initName; |
| return list; |
| }'''))); |
| buffer.write(jsAst.prettyPrint(value, compiler)); |
| } |
| |
| /// Returns the code equivalent to: |
| /// `function(args) { $.startRootIsolate(X.main$closure(), args); }` |
| String buildIsolateSetupClosure(CodeBuffer buffer, |
| Element appMain, |
| Element isolateMain) { |
| jsAst.Expression mainAccess = namer.isolateStaticClosureAccess(appMain); |
| // Since we pass the closurized version of the main method to |
| // the isolate method, we must make sure that it exists. |
| jsAst.Expression setup = js('function(a){ #(#, a); }', |
| [namer.elementAccess(isolateMain), mainAccess]); |
| |
| return '(' + jsAst.prettyPrint(setup, compiler).getText() + ')'; |
| } |
| |
| /** |
| * Emits code that sets `init.isolateTag` to a unique string. |
| */ |
| jsAst.Expression generateIsolateAffinityTagInitialization() { |
| return js(''' |
| !function() { |
| // On V8, the 'intern' function converts a string to a symbol, which |
| // makes property access much faster. |
| function intern(s) { |
| var o = {}; |
| o[s] = 1; |
| return Object.keys(convertToFastObject(o))[0]; |
| } |
| |
| init.getIsolateTag = function(name) { |
| return intern("___dart_" + name + init.isolateTag); |
| }; |
| |
| // To ensure that different programs loaded into the same context (page) |
| // use distinct dispatch properies, we place an object on `Object` to |
| // contain the names already in use. |
| var tableProperty = "___dart_isolate_tags_"; |
| var usedProperties = Object[tableProperty] || |
| (Object[tableProperty] = Object.create(null)); |
| |
| var rootProperty = "_${generateIsolateTagRoot()}"; |
| for (var i = 0; ; i++) { |
| var property = intern(rootProperty + "_" + i + "_"); |
| if (!(property in usedProperties)) { |
| usedProperties[property] = 1; |
| init.isolateTag = property; |
| break; |
| } |
| } |
| }() |
| '''); |
| } |
| |
| jsAst.Expression generateDispatchPropertyNameInitialization() { |
| return js( |
| 'init.dispatchPropertyName = init.getIsolateTag("dispatch_record")'); |
| } |
| |
| String generateIsolateTagRoot() { |
| // TODO(sra): MD5 of contributing source code or URIs? |
| return 'ZxYxX'; |
| } |
| |
| emitMain(CodeBuffer buffer) { |
| if (compiler.isMockCompilation) return; |
| Element main = compiler.mainFunction; |
| String mainCallClosure = null; |
| if (compiler.hasIsolateSupport()) { |
| Element isolateMain = |
| compiler.isolateHelperLibrary.find(Compiler.START_ROOT_ISOLATE); |
| mainCallClosure = buildIsolateSetupClosure(buffer, main, isolateMain); |
| } else { |
| // TODO(sra): Replace with AST. |
| mainCallClosure = '${namer.isolateAccess(main)}'; |
| } |
| |
| if (backend.needToInitializeIsolateAffinityTag) { |
| buffer.write( |
| jsAst.prettyPrint(generateIsolateAffinityTagInitialization(), |
| compiler)); |
| buffer.write(N); |
| } |
| if (backend.needToInitializeDispatchProperty) { |
| assert(backend.needToInitializeIsolateAffinityTag); |
| buffer.write( |
| jsAst.prettyPrint(generateDispatchPropertyNameInitialization(), |
| compiler)); |
| buffer.write(N); |
| } |
| |
| addComment('BEGIN invoke [main].', buffer); |
| // This code finds the currently executing script by listening to the |
| // onload event of all script tags and getting the first script which |
| // finishes. Since onload is called immediately after execution this should |
| // not substantially change execution order. |
| buffer.write(''' |
| ;(function (callback) { |
| if (typeof document === "undefined") { |
| callback(null); |
| return; |
| } |
| if (document.currentScript) { |
| callback(document.currentScript); |
| return; |
| } |
| |
| var scripts = document.scripts; |
| function onLoad(event) { |
| for (var i = 0; i < scripts.length; ++i) { |
| scripts[i].removeEventListener("load", onLoad, false); |
| } |
| callback(event.target); |
| } |
| for (var i = 0; i < scripts.length; ++i) { |
| scripts[i].addEventListener("load", onLoad, false); |
| } |
| })(function(currentScript) { |
| init.currentScript = currentScript; |
| |
| if (typeof dartMainRunner === "function") { |
| dartMainRunner(${mainCallClosure}, []); |
| } else { |
| ${mainCallClosure}([]); |
| } |
| })$N'''); |
| addComment('END invoke [main].', buffer); |
| } |
| |
| /** |
| * Compute all the classes that must be emitted. |
| */ |
| void computeNeededClasses() { |
| instantiatedClasses = |
| compiler.codegenWorld.instantiatedClasses.where(computeClassFilter()) |
| .toSet(); |
| |
| void addClassWithSuperclasses(ClassElement cls) { |
| neededClasses.add(cls); |
| for (ClassElement superclass = cls.superclass; |
| superclass != null; |
| superclass = superclass.superclass) { |
| neededClasses.add(superclass); |
| } |
| } |
| |
| void addClassesWithSuperclasses(Iterable<ClassElement> classes) { |
| for (ClassElement cls in classes) { |
| addClassWithSuperclasses(cls); |
| } |
| } |
| |
| // 1. We need to generate all classes that are instantiated. |
| addClassesWithSuperclasses(instantiatedClasses); |
| |
| // 2. Add all classes used as mixins. |
| Set<ClassElement> mixinClasses = neededClasses |
| .where((ClassElement element) => element.isMixinApplication) |
| .map(computeMixinClass) |
| .toSet(); |
| neededClasses.addAll(mixinClasses); |
| |
| // 3. If we need noSuchMethod support, we run through all needed |
| // classes to figure out if we need the support on any native |
| // class. If so, we let the native emitter deal with it. |
| if (compiler.enabledNoSuchMethod) { |
| String noSuchMethodName = Compiler.NO_SUCH_METHOD; |
| Selector noSuchMethodSelector = compiler.noSuchMethodSelector; |
| for (ClassElement element in neededClasses) { |
| if (!element.isNative()) continue; |
| Element member = element.lookupLocalMember(noSuchMethodName); |
| if (member == null) continue; |
| if (noSuchMethodSelector.applies(member, compiler)) { |
| nativeEmitter.handleNoSuchMethod = true; |
| break; |
| } |
| } |
| } |
| |
| // 4. Find all classes needed for rti. |
| // It is important that this is the penultimate step, at this point, |
| // neededClasses must only contain classes that have been resolved and |
| // codegen'd. The rtiNeededClasses may contain additional classes, but |
| // these are thought to not have been instantiated, so we neeed to be able |
| // to identify them later and make sure we only emit "empty shells" without |
| // fields, etc. |
| typeTestEmitter.computeRtiNeededClasses(); |
| typeTestEmitter.rtiNeededClasses.removeAll(neededClasses); |
| // rtiNeededClasses now contains only the "empty shells". |
| neededClasses.addAll(typeTestEmitter.rtiNeededClasses); |
| |
| // TODO(18175, floitsch): remove once issue 18175 is fixed. |
| if (neededClasses.contains(backend.jsIntClass)) { |
| neededClasses.add(compiler.intClass); |
| } |
| if (neededClasses.contains(backend.jsDoubleClass)) { |
| neededClasses.add(compiler.doubleClass); |
| } |
| if (neededClasses.contains(backend.jsNumberClass)) { |
| neededClasses.add(compiler.numClass); |
| } |
| if (neededClasses.contains(backend.jsStringClass)) { |
| neededClasses.add(compiler.stringClass); |
| } |
| if (neededClasses.contains(backend.jsBoolClass)) { |
| neededClasses.add(compiler.boolClass); |
| } |
| if (neededClasses.contains(backend.jsArrayClass)) { |
| neededClasses.add(compiler.listClass); |
| } |
| |
| // 5. Finally, sort the classes. |
| List<ClassElement> sortedClasses = Elements.sortedByPosition(neededClasses); |
| |
| for (ClassElement element in sortedClasses) { |
| if (typeTestEmitter.rtiNeededClasses.contains(element)) { |
| // TODO(sigurdm): We might be able to defer some of these. |
| outputClassLists.putIfAbsent(compiler.deferredLoadTask.mainOutputUnit, |
| () => new List<ClassElement>()).add(element); |
| } else if (Elements.isNativeOrExtendsNative(element)) { |
| // For now, native classes and related classes cannot be deferred. |
| nativeClasses.add(element); |
| if (!element.isNative()) { |
| assert(invariant(element, |
| !compiler.deferredLoadTask.isDeferred(element))); |
| outputClassLists.putIfAbsent(compiler.deferredLoadTask.mainOutputUnit, |
| () => new List<ClassElement>()).add(element); |
| } |
| } else { |
| outputClassLists.putIfAbsent( |
| compiler.deferredLoadTask.outputUnitForElement(element), |
| () => new List<ClassElement>()) |
| .add(element); |
| } |
| } |
| } |
| |
| void emitInitFunction(CodeBuffer buffer) { |
| jsAst.FunctionDeclaration decl = js.statement(''' |
| function init() { |
| $isolateProperties = {}; |
| #; #; #; |
| }''', [ |
| buildDefineClassAndFinishClassFunctionsIfNecessary(), |
| buildLazyInitializerFunctionIfNecessary(), |
| buildFinishIsolateConstructor()]); |
| |
| buffer.write(jsAst.prettyPrint(decl, compiler).getText()); |
| if (compiler.enableMinification) buffer.write('\n'); |
| } |
| |
| void emitConvertToFastObjectFunction() { |
| // Create an instance that uses 'properties' as prototype. This should make |
| // 'properties' a fast object. |
| mainBuffer.add(r'''function convertToFastObject(properties) { |
| function MyClass() {}; |
| MyClass.prototype = properties; |
| new MyClass(); |
| '''); |
| if (DEBUG_FAST_OBJECTS) { |
| ClassElement primitives = |
| compiler.findHelper('Primitives'); |
| FunctionElement printHelper = |
| compiler.lookupElementIn( |
| primitives, 'printString'); |
| // TODO(sra): Replace with AST. |
| String printHelperName = namer.isolateAccess(printHelper); |
| mainBuffer.add(''' |
| // The following only works on V8 when run with option "--allow-natives-syntax". |
| if (typeof $printHelperName === "function") { |
| $printHelperName("Size of global object: " |
| + String(Object.getOwnPropertyNames(properties).length) |
| + ", fast properties " + %HasFastProperties(properties)); |
| } |
| '''); |
| } |
| mainBuffer.add(r''' |
| return properties; |
| } |
| '''); |
| } |
| |
| void writeLibraryDescriptors(LibraryElement library) { |
| var uri = library.canonicalUri; |
| if (uri.scheme == 'file' && compiler.sourceMapUri != null) { |
| // TODO(ahe): It is a hack to use compiler.sourceMapUri |
| // here. It should be relative to the main JavaScript |
| // output file. |
| uri = relativize( |
| compiler.sourceMapUri, library.canonicalUri, false); |
| } |
| Map<OutputUnit, ClassBuilder> descriptors = |
| elementDescriptors[library]; |
| |
| for (OutputUnit outputUnit in compiler.deferredLoadTask.allOutputUnits) { |
| ClassBuilder descriptor = |
| descriptors.putIfAbsent(outputUnit, () => new ClassBuilder(namer)); |
| if (descriptor.properties.isEmpty) continue; |
| bool isDeferred = |
| outputUnit != compiler.deferredLoadTask.mainOutputUnit; |
| jsAst.Fun metadata = metadataEmitter.buildMetadataFunction(library); |
| |
| jsAst.ObjectInitializer initializers = |
| descriptor.toObjectInitializer(); |
| CodeBuffer outputBuffer = |
| outputBuffers.putIfAbsent(outputUnit, () => new CodeBuffer()); |
| int sizeBefore = outputBuffer.length; |
| outputBuffers[outputUnit] |
| ..write('["${library.getLibraryName()}",$_') |
| ..write('"${uri}",$_') |
| ..write(metadata == null ? "" : jsAst.prettyPrint(metadata, compiler)) |
| ..write(',$_') |
| ..write(namer.globalObjectFor(library)) |
| ..write(',$_') |
| ..write(jsAst.prettyPrint(initializers, compiler)) |
| ..write(library == compiler.mainApp ? ',${n}1' : "") |
| ..write('],$n'); |
| int sizeAfter = outputBuffer.length; |
| compiler.dumpInfoTask.codeSizeCounter |
| .countCode(library, sizeAfter - sizeBefore); |
| } |
| } |
| |
| String assembleProgram() { |
| measure(() { |
| // Compute the required type checks to know which classes need a |
| // 'is$' method. |
| typeTestEmitter.computeRequiredTypeChecks(); |
| |
| computeNeededClasses(); |
| |
| mainBuffer.add(buildGeneratedBy()); |
| addComment(HOOKS_API_USAGE, mainBuffer); |
| |
| if (!compiler.deferredLoadTask.splitProgram) { |
| mainBuffer.add('(function(${namer.currentIsolate})$_{$n'); |
| } |
| |
| // Using a named function here produces easier to read stack traces in |
| // Chrome/V8. |
| mainBuffer.add('function dart(){${_}this.x$_=${_}0$_}'); |
| for (String globalObject in Namer.reservedGlobalObjectNames) { |
| // The global objects start as so-called "slow objects". For V8, this |
| // means that it won't try to make map transitions as we add properties |
| // to these objects. Later on, we attempt to turn these objects into |
| // fast objects by calling "convertToFastObject" (see |
| // [emitConvertToFastObjectFunction]). |
| mainBuffer |
| ..write('var ${globalObject}$_=${_}new dart$N') |
| ..write('delete ${globalObject}.x$N'); |
| } |
| |
| mainBuffer.add('function ${namer.isolateName}()$_{}\n'); |
| mainBuffer.add('init()$N$n'); |
| // Shorten the code by using [namer.currentIsolate] as temporary. |
| isolateProperties = namer.currentIsolate; |
| mainBuffer.add( |
| '$isolateProperties$_=$_$isolatePropertiesName$N'); |
| |
| emitStaticFunctions(); |
| |
| // Only output the classesCollector if we actually have any classes. |
| if (!(nativeClasses.isEmpty && |
| compiler.codegenWorld.staticFunctionsNeedingGetter.isEmpty && |
| outputClassLists.values.every((classList) => classList.isEmpty))) { |
| // Shorten the code by using "$$" as temporary. |
| classesCollector = r"$$"; |
| mainBuffer.add('var $classesCollector$_=$_{}$N$n'); |
| } |
| |
| // Emit native classes on [nativeBuffer]. |
| // Might create methodClosures. |
| final CodeBuffer nativeBuffer = new CodeBuffer(); |
| if (!nativeClasses.isEmpty) { |
| addComment('Native classes', nativeBuffer); |
| addComment('Native classes', mainBuffer); |
| nativeEmitter.generateNativeClasses(nativeClasses, mainBuffer, |
| additionalProperties); |
| } |
| |
| // As a side-effect, emitting classes will produce "bound closures" in |
| // [methodClosures]. The bound closures are JS AST nodes that add |
| // properties to $$ [classesCollector]. The bound closures are not |
| // emitted until we have emitted all other classes (native or not). |
| |
| // Might create methodClosures. |
| for (List<ClassElement> outputClassList in outputClassLists.values) { |
| for (ClassElement element in outputClassList) { |
| generateClass(element, getElementDecriptor(element)); |
| } |
| } |
| |
| nativeEmitter.finishGenerateNativeClasses(); |
| nativeEmitter.assembleCode(nativeBuffer); |
| |
| |
| // After this assignment we will produce invalid JavaScript code if we use |
| // the classesCollector variable. |
| classesCollector = 'classesCollector should not be used from now on'; |
| |
| // TODO(sigurdm): Need to check this for each outputUnit. |
| if (!elementDescriptors.isEmpty) { |
| var oldClassesCollector = classesCollector; |
| classesCollector = r"$$"; |
| if (compiler.enableMinification) { |
| mainBuffer.write(';'); |
| } |
| |
| for (Element element in elementDescriptors.keys) { |
| // TODO(ahe): Should iterate over all libraries. Otherwise, we will |
| // not see libraries that only have fields. |
| if (element.isLibrary()) { |
| LibraryElement library = element; |
| ClassBuilder builder = new ClassBuilder(namer); |
| if (classEmitter.emitFields( |
| library, builder, null, emitStatics: true)) { |
| OutputUnit mainUnit = compiler.deferredLoadTask.mainOutputUnit; |
| getElementDescriptorForOutputUnit(library, mainUnit) |
| .properties.addAll(builder.toObjectInitializer().properties); |
| } |
| } |
| } |
| |
| if (!mangledFieldNames.isEmpty) { |
| var keys = mangledFieldNames.keys.toList(); |
| keys.sort(); |
| var properties = []; |
| for (String key in keys) { |
| var value = js.string('${mangledFieldNames[key]}'); |
| properties.add(new jsAst.Property(js.string(key), value)); |
| } |
| var map = new jsAst.ObjectInitializer(properties); |
| mainBuffer.write( |
| jsAst.prettyPrint( |
| js.statement('init.mangledNames = #', map), compiler)); |
| if (compiler.enableMinification) { |
| mainBuffer.write(';'); |
| } |
| } |
| if (!mangledGlobalFieldNames.isEmpty) { |
| var keys = mangledGlobalFieldNames.keys.toList(); |
| keys.sort(); |
| var properties = []; |
| for (String key in keys) { |
| var value = js.string('${mangledGlobalFieldNames[key]}'); |
| properties.add(new jsAst.Property(js.string(key), value)); |
| } |
| var map = new jsAst.ObjectInitializer(properties); |
| mainBuffer.write( |
| jsAst.prettyPrint( |
| js.statement('init.mangledGlobalNames = #', map), |
| compiler)); |
| if (compiler.enableMinification) { |
| mainBuffer.write(';'); |
| } |
| } |
| mainBuffer |
| ..write('(') |
| ..write( |
| jsAst.prettyPrint( |
| getReflectionDataParser(classesCollector, backend), |
| compiler)) |
| ..write(')') |
| ..write('([$n'); |
| |
| List<Element> sortedElements = |
| Elements.sortedByPosition(elementDescriptors.keys); |
| |
| Iterable<Element> pendingStatics = sortedElements.where((element) { |
| return !element.isLibrary() && |
| elementDescriptors[element].values.any((descriptor) => |
| descriptor != null); |
| }); |
| |
| pendingStatics.forEach((element) => |
| compiler.reportInfo( |
| element, MessageKind.GENERIC, {'text': 'Pending statics.'})); |
| |
| for (LibraryElement library in sortedElements.where((element) => |
| element.isLibrary())) { |
| writeLibraryDescriptors(library); |
| elementDescriptors[library] = const {}; |
| } |
| if (!pendingStatics.isEmpty) { |
| compiler.internalError(pendingStatics.first, |
| 'Pending statics (see above).'); |
| } |
| mainBuffer.write('])$N'); |
| |
| emitFinishClassesInvocationIfNecessary(mainBuffer); |
| classesCollector = oldClassesCollector; |
| } |
| OutputUnit mainOutputUnit = compiler.deferredLoadTask.mainOutputUnit; |
| typeTestEmitter.emitRuntimeTypeSupport(mainBuffer, mainOutputUnit); |
| interceptorEmitter.emitGetInterceptorMethods(mainBuffer); |
| interceptorEmitter.emitOneShotInterceptors(mainBuffer); |
| // Constants in checked mode call into RTI code to set type information |
| // which may need getInterceptor (and one-shot interceptor) methods, so |
| // we have to make sure that [emitGetInterceptorMethods] and |
| // [emitOneShotInterceptors] have been called. |
| emitCompileTimeConstants(mainBuffer, mainOutputUnit); |
| |
| // Write a javascript mapping from Deferred import load ids (derrived from |
| // the import prefix.) to a list of lists of js hunks to load. |
| // TODO(sigurdm): Create a syntax tree for this. |
| // TODO(sigurdm): Also find out where to place it. |
| mainBuffer.write("\$.libraries_to_load = {"); |
| for (String loadId in compiler.deferredLoadTask.hunksToLoad.keys) { |
| // TODO(sigurdm): Escape these strings. |
| mainBuffer.write('"$loadId":['); |
| for (List<OutputUnit> outputUnits in |
| compiler.deferredLoadTask.hunksToLoad[loadId]) { |
| mainBuffer.write("["); |
| for (OutputUnit outputUnit in outputUnits) { |
| mainBuffer |
| .write('"${outputUnit.partFileName(compiler)}.part.js", '); |
| } |
| mainBuffer.write("],"); |
| } |
| mainBuffer.write("],\n"); |
| } |
| mainBuffer.write("}$N"); |
| // Static field initializations require the classes and compile-time |
| // constants to be set up. |
| emitStaticNonFinalFieldInitializations(mainBuffer); |
| interceptorEmitter.emitInterceptedNames(mainBuffer); |
| interceptorEmitter.emitMapTypeToInterceptor(mainBuffer); |
| emitLazilyInitializedStaticFields(mainBuffer); |
| |
| mainBuffer.add(nativeBuffer); |
| |
| metadataEmitter.emitMetadata(mainBuffer); |
| |
| isolateProperties = isolatePropertiesName; |
| // The following code should not use the short-hand for the |
| // initialStatics. |
| mainBuffer.add('${namer.currentIsolate}$_=${_}null$N'); |
| |
| emitFinishIsolateConstructorInvocation(mainBuffer); |
| mainBuffer.add( |
| '${namer.currentIsolate}$_=${_}new ${namer.isolateName}()$N'); |
| |
| emitConvertToFastObjectFunction(); |
| for (String globalObject in Namer.reservedGlobalObjectNames) { |
| mainBuffer.add('$globalObject = convertToFastObject($globalObject)$N'); |
| } |
| if (DEBUG_FAST_OBJECTS) { |
| ClassElement primitives = |
| compiler.findHelper('Primitives'); |
| FunctionElement printHelper = |
| compiler.lookupElementIn( |
| primitives, 'printString'); |
| // TODO(sra): Replace with AST. |
| String printHelperName = namer.isolateAccess(printHelper); |
| |
| mainBuffer.add(''' |
| // The following only works on V8 when run with option "--allow-natives-syntax". |
| if (typeof $printHelperName === "function") { |
| $printHelperName("Size of global helper object: " |
| + String(Object.getOwnPropertyNames(H).length) |
| + ", fast properties " + %HasFastProperties(H)); |
| $printHelperName("Size of global platform object: " |
| + String(Object.getOwnPropertyNames(P).length) |
| + ", fast properties " + %HasFastProperties(P)); |
| $printHelperName("Size of global dart:html object: " |
| + String(Object.getOwnPropertyNames(W).length) |
| + ", fast properties " + %HasFastProperties(W)); |
| $printHelperName("Size of isolate properties object: " |
| + String(Object.getOwnPropertyNames(\$).length) |
| + ", fast properties " + %HasFastProperties(\$)); |
| $printHelperName("Size of constant object: " |
| + String(Object.getOwnPropertyNames(C).length) |
| + ", fast properties " + %HasFastProperties(C)); |
| var names = Object.getOwnPropertyNames(\$); |
| for (var i = 0; i < names.length; i++) { |
| $printHelperName("\$." + names[i]); |
| } |
| } |
| '''); |
| for (String object in Namer.userGlobalObjects) { |
| mainBuffer.add(''' |
| if (typeof $printHelperName === "function") { |
| $printHelperName("Size of $object: " |
| + String(Object.getOwnPropertyNames($object).length) |
| + ", fast properties " + %HasFastProperties($object)); |
| } |
| '''); |
| } |
| } |
| |
| emitMain(mainBuffer); |
| jsAst.FunctionDeclaration precompiledFunctionAst = |
| buildPrecompiledFunction(); |
| emitInitFunction(mainBuffer); |
| if (!compiler.deferredLoadTask.splitProgram) { |
| mainBuffer.add('})()\n'); |
| } else { |
| mainBuffer.add('\n'); |
| } |
| |
| if (compiler.useContentSecurityPolicy) { |
| mainBuffer.write( |
| jsAst.prettyPrint( |
| precompiledFunctionAst, compiler, |
| allowVariableMinification: false).getText()); |
| } |
| |
| String assembledCode = mainBuffer.getText(); |
| String sourceMapTags = ""; |
| if (generateSourceMap) { |
| outputSourceMap(assembledCode, mainBuffer, '', |
| compiler.sourceMapUri, compiler.outputUri); |
| sourceMapTags = |
| generateSourceMapTag(compiler.sourceMapUri, compiler.outputUri); |
| } |
| compiler.outputProvider('', 'js') |
| ..add(assembledCode) |
| ..add(sourceMapTags) |
| ..close(); |
| compiler.assembledCode = assembledCode; |
| |
| if (!compiler.useContentSecurityPolicy) { |
| mainBuffer.write(""" |
| { |
| var message = |
| 'Deprecation: Automatic generation of output for Content Security\\n' + |
| 'Policy is deprecated and will be removed with the next development\\n' + |
| 'release. Use the --csp option to generate CSP restricted output.'; |
| if (typeof dartPrint == "function") { |
| dartPrint(message); |
| } else if (typeof console == "object" && typeof console.log == "function") { |
| console.log(message); |
| } else if (typeof print == "function") { |
| print(message); |
| } |
| }\n"""); |
| |
| mainBuffer.write( |
| jsAst.prettyPrint( |
| precompiledFunctionAst, compiler, |
| allowVariableMinification: false).getText()); |
| |
| compiler.outputProvider('', 'precompiled.js') |
| ..add(mainBuffer.getText()) |
| ..close(); |
| } |
| emitDeferredCode(); |
| |
| }); |
| return compiler.assembledCode; |
| } |
| |
| String generateSourceMapTag(Uri sourceMapUri, Uri fileUri) { |
| if (sourceMapUri != null && fileUri != null) { |
| // Using # is the new proposed standard. @ caused problems in Internet |
| // Explorer due to "Conditional Compilation Statements" in JScript, |
| // see: |
| // http://msdn.microsoft.com/en-us/library/7kx09ct1(v=vs.80).aspx |
| // About source maps, see: |
| // https://docs.google.com/a/google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit |
| // TODO(http://dartbug.com/11914): Remove @ line. |
| String sourceMapFileName = relativize(fileUri, sourceMapUri, false); |
| return ''' |
| |
| //# sourceMappingURL=$sourceMapFileName |
| //@ sourceMappingURL=$sourceMapFileName |
| '''; |
| } |
| return ''; |
| } |
| |
| ClassBuilder getElementDescriptorForOutputUnit(Element element, |
| OutputUnit outputUnit) { |
| Map<OutputUnit, ClassBuilder> descriptors = |
| elementDescriptors.putIfAbsent( |
| element, () => new Map<OutputUnit, ClassBuilder>()); |
| return descriptors.putIfAbsent(outputUnit, |
| () => new ClassBuilder(namer)); |
| } |
| |
| ClassBuilder getElementDecriptor(Element element) { |
| Element owner = element.getLibrary(); |
| if (!element.isTopLevel() && !element.isNative()) { |
| // For static (not top level) elements, record their code in a buffer |
| // specific to the class. For now, not supported for native classes and |
| // native elements. |
| ClassElement cls = |
| element.getEnclosingClassOrCompilationUnit().declaration; |
| if (compiler.codegenWorld.instantiatedClasses.contains(cls) |
| && !cls.isNative()) { |
| owner = cls; |
| } |
| } |
| if (owner == null) { |
| compiler.internalError(element, 'Owner is null.'); |
| } |
| return getElementDescriptorForOutputUnit(owner, |
| compiler.deferredLoadTask.outputUnitForElement(element)); |
| } |
| |
| void emitDeferredCode() { |
| for (OutputUnit outputUnit in compiler.deferredLoadTask.allOutputUnits) { |
| if (outputUnit == compiler.deferredLoadTask.mainOutputUnit) continue; |
| CodeBuffer outputBuffer = outputBuffers.putIfAbsent(outputUnit, |
| () => new CodeBuffer()); |
| |
| var oldClassesCollector = classesCollector; |
| classesCollector = r"$$"; |
| |
| var buffer = new CodeBuffer() |
| ..write(buildGeneratedBy()) |
| ..write('var old${namer.currentIsolate}$_=' |
| '$_${namer.currentIsolate}$N' |
| // TODO(ahe): This defines a lot of properties on the |
| // Isolate.prototype object. We know this will turn it into a |
| // slow object in V8, so instead we should do something similar |
| // to Isolate.$finishIsolateConstructor. |
| '${namer.currentIsolate}$_=' |
| '$_${namer.isolateName}.prototype$N$n' |
| // The classesCollector object ($$). |
| '$classesCollector$_=$_{};$n') |
| ..write('(') |
| ..write( |
| jsAst.prettyPrint( |
| getReflectionDataParser(classesCollector, backend), |
| compiler)) |
| ..write(')') |
| ..write('([$n') |
| ..addBuffer(outputBuffer) |
| ..write('])$N'); |
| |
| if (outputClassLists.containsKey(outputUnit)) { |
| buffer.write( |
| '$finishClassesName($classesCollector,$_${namer.currentIsolate},' |
| '$_$isolatePropertiesName)$N'); |
| } |
| |
| buffer.write( |
| // Reset the classesCollector ($$). |
| '$classesCollector$_=${_}null$N$n' |
| '${namer.currentIsolate}$_=${_}old${namer.currentIsolate}$N'); |
| |
| classesCollector = oldClassesCollector; |
| |
| typeTestEmitter.emitRuntimeTypeSupport(buffer, outputUnit); |
| |
| emitCompileTimeConstants(buffer, outputUnit); |
| |
| String code = buffer.getText(); |
| compiler.outputProvider(outputUnit.partFileName(compiler), 'part.js') |
| ..add(code) |
| ..close(); |
| |
| // TODO(johnniwinther): Support source maps for deferred code. |
| } |
| } |
| |
| String buildGeneratedBy() { |
| var suffix = ''; |
| if (compiler.hasBuildId) suffix = ' version: ${compiler.buildId}'; |
| return '// Generated by dart2js, the Dart to JavaScript compiler$suffix.\n'; |
| } |
| |
| void outputSourceMap(String code, CodeBuffer buffer, String name, |
| [Uri sourceMapUri, Uri fileUri]) { |
| if (!generateSourceMap) return; |
| // Create a source file for the compilation output. This allows using |
| // [:getLine:] to transform offsets to line numbers in [SourceMapBuilder]. |
| SourceFile compiledFile = new StringSourceFile(null, code); |
| SourceMapBuilder sourceMapBuilder = |
| new SourceMapBuilder(sourceMapUri, fileUri, compiledFile); |
| buffer.forEachSourceLocation(sourceMapBuilder.addMapping); |
| String sourceMap = sourceMapBuilder.build(); |
| compiler.outputProvider(name, 'js.map') |
| ..add(sourceMap) |
| ..close(); |
| } |
| |
| void registerReadTypeVariable(TypeVariableElement element) { |
| readTypeVariables.add(element); |
| } |
| } |
