Linter Demo Errors: 6Warnings: 56File: /home/fstrocco/Dart/dart/benchmark/compiler/lib/src/js_emitter/old_emitter/emitter.dart // Copyright (c) 2014, 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; class OldEmitter implements Emitter { final Compiler compiler; final CodeEmitterTask task; final ContainerBuilder containerBuilder = new ContainerBuilder(); final ClassEmitter classEmitter = new ClassEmitter(); final NsmEmitter nsmEmitter = new NsmEmitter(); final InterceptorEmitter interceptorEmitter = new InterceptorEmitter(); // TODO(johnniwinther): Wrap these fields in a caching strategy. final Set<ConstantValue> cachedEmittedConstants; final CodeBuffer cachedEmittedConstantsBuffer = new CodeBuffer(); final Map<Element, ClassBuilder> cachedClassBuilders; final Set<Element> cachedElements; bool needsClassSupport = false; bool needsMixinSupport = false; bool needsLazyInitializer = false; /// True if [ContainerBuilder.addMemberMethodFromInfo] used "structured info", /// that is, some function was needed for reflection, had stubs, or had a /// super alias. bool needsStructuredMemberInfo = false; final Namer namer; ConstantEmitter constantEmitter; NativeEmitter get nativeEmitter => task.nativeEmitter; TypeTestRegistry get typeTestRegistry => task.typeTestRegistry; // The full code that is written to each hunk part-file. Map<OutputUnit, CodeOutput> outputBuffers = new Map<OutputUnit, CodeOutput>(); /** Shorter access to [isolatePropertiesName]. Both here in the code, as well as in the generated code. */ String isolateProperties; String classesCollector; Set<ClassElement> get neededClasses => task.neededClasses; Map<OutputUnit, List<ClassElement>> get outputClassLists => task.outputClassLists; Map<OutputUnit, List<ConstantValue>> get outputConstantLists => task.outputConstantLists; final Map<String, String> mangledFieldNames = <String, String>{}; final Map<String, String> mangledGlobalFieldNames = <String, String>{}; final Set<String> recordedMangledNames = new Set<String>(); List<TypedefElement> get typedefsNeededForReflection => task.typedefsNeededForReflection; 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"; /** * 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, so dart2js emits them directly * when in CSP mode. */ Map<OutputUnit, List<jsAst.Node>> _cspPrecompiledFunctions = new Map<OutputUnit, List<jsAst.Node>>(); Map<OutputUnit, List<jsAst.Expression>> _cspPrecompiledConstructorNames = new Map<OutputUnit, List<jsAst.Expression>>(); /** * Accumulate properties for classes and libraries, describing their * static/top-level members. * Later, these members are emitted when the class or library is emitted. * * See [getElementDescriptor]. */ // TODO(ahe): Generate statics with their class, and store only libraries in // this map. final Map<Element, ClassBuilder> elementDescriptors = new Map<Element, ClassBuilder>(); final bool generateSourceMap; OldEmitter(Compiler compiler, Namer namer, this.generateSourceMap, this.task) : this.compiler = compiler, this.namer = namer, cachedEmittedConstants = compiler.cacheStrategy.newSet(), cachedClassBuilders = compiler.cacheStrategy.newMap(), cachedElements = compiler.cacheStrategy.newSet() { constantEmitter = new ConstantEmitter( compiler, namer, this.constantReference, makeConstantListTemplate); containerBuilder.emitter = this; classEmitter.emitter = this; nsmEmitter.emitter = this; interceptorEmitter.emitter = this; } List<jsAst.Node> cspPrecompiledFunctionFor(OutputUnit outputUnit) { return _cspPrecompiledFunctions.putIfAbsent( outputUnit, () => new List<jsAst.Node>()); } List<jsAst.Expression> cspPrecompiledConstructorNamesFor( OutputUnit outputUnit) { return _cspPrecompiledConstructorNames.putIfAbsent( outputUnit, () => new List<jsAst.Expression>()); } /// Erases the precompiled information for csp mode for all output units. /// Used by the incremental compiler. void clearCspPrecompiledNodes() { _cspPrecompiledFunctions.clear(); _cspPrecompiledConstructorNames.clear(); } void addComment(String comment, CodeOutput output) { output.addBuffer(jsAst.prettyPrint(js.comment(comment), compiler)); } @override bool isConstantInlinedOrAlreadyEmitted(ConstantValue 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; } @override int compareConstants(ConstantValue a, ConstantValue 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)); } @override jsAst.Expression constantReference(ConstantValue value) { if (value.isFunction) { FunctionConstantValue functionConstant = value; return isolateStaticClosureAccess(functionConstant.element); } // We are only interested in the "isInlined" part, but it does not hurt to // test for the other predicates. if (isConstantInlinedOrAlreadyEmitted(value)) { return constantEmitter.generate(value); } return js('#.#', [namer.globalObjectForConstant(value), namer.constantName(value)]); } jsAst.Expression constantInitializerExpression(ConstantValue value) { return constantEmitter.generate(value); } String get name => 'CodeEmitter'; String get finishIsolateConstructorName => '${namer.isolateName}.\$finishIsolateConstructor'; String get isolatePropertiesName => '${namer.isolateName}.${namer.isolatePropertiesName}'; String get lazyInitializerProperty => r'$lazy'; String get lazyInitializerName => '${namer.isolateName}.${lazyInitializerProperty}'; String get initName => 'init'; String get makeConstListProperty => namer.internalGlobal('makeConstantList'); /// The name of the property that contains all field names. /// /// This property is added to constructors when isolate support is enabled. static const String FIELD_NAMES_PROPERTY_NAME = r"$__fields__"; /// For deferred loading we communicate the initializers via this global var. final String deferredInitializers = r"$dart_deferred_initializers"; /// Contains the global state that is needed to initialize and load a /// deferred library. String get globalsHolder => namer.internalGlobal("globalsHolder"); @override jsAst.Expression generateEmbeddedGlobalAccess(String global) { return js(generateEmbeddedGlobalAccessString(global)); } String generateEmbeddedGlobalAccessString(String global) { // TODO(floitsch): don't use 'init' as global embedder storage. return '$initName.$global'; } jsAst.PropertyAccess globalPropertyAccess(Element element) { String name = namer.globalPropertyName(element); jsAst.PropertyAccess pa = new jsAst.PropertyAccess.field( new jsAst.VariableUse(namer.globalObjectFor(element)), name); return pa; } @override jsAst.Expression isolateLazyInitializerAccess(FieldElement element) { return jsAst.js('#.#', [namer.globalObjectFor(element), namer.lazyInitializerName(element)]); } @override jsAst.Expression isolateStaticClosureAccess(FunctionElement element) { return jsAst.js('#.#()', [namer.globalObjectFor(element), namer.staticClosureName(element)]); } @override jsAst.PropertyAccess staticFieldAccess(FieldElement element) { return globalPropertyAccess(element); } @override jsAst.PropertyAccess staticFunctionAccess(FunctionElement element) { return globalPropertyAccess(element); } @override jsAst.PropertyAccess constructorAccess(ClassElement element) { return globalPropertyAccess(element); } @override jsAst.PropertyAccess prototypeAccess(ClassElement element, bool hasBeenInstantiated) { return jsAst.js('#.prototype', constructorAccess(element)); } @override jsAst.PropertyAccess interceptorClassAccess(ClassElement element) { return globalPropertyAccess(element); } @override jsAst.PropertyAccess typeAccess(Element element) { return globalPropertyAccess(element); } List<jsAst.Statement> buildTrivialNsmHandlers(){ return nsmEmitter.buildTrivialNsmHandlers(); } jsAst.Statement buildNativeInfoHandler( jsAst.Expression infoAccess, jsAst.Expression constructorAccess, jsAst.Expression subclassReadGenerator(jsAst.Expression subclass), jsAst.Expression interceptorsByTagAccess, jsAst.Expression leafTagsAccess) { return nativeEmitter.buildNativeInfoHandler(infoAccess, constructorAccess, subclassReadGenerator, interceptorsByTagAccess, leafTagsAccess); } jsAst.ObjectInitializer generateInterceptedNamesSet() { return interceptorEmitter.generateInterceptedNamesSet(); } void emitFinishIsolateConstructorInvocation(CodeOutput output) { String isolate = namer.isolateName; output.add("$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.isAccessibleByReflection(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 = namer.privateName(elementOrSelector.memberName); 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.putIfAbsent(getter, () => name); assert(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 " $mangledName"; } if (elementOrSelector is Selector || elementOrSelector.isFunction || elementOrSelector.isConstructor) { int positionalParameterCount; String namedArguments = ''; bool isConstructor = false; if (elementOrSelector is Selector) { CallStructure callStructure = elementOrSelector.callStructure; positionalParameterCount = callStructure.positionalArgumentCount; namedArguments = namedParametersAsReflectionNames(callStructure); } else { FunctionElement function = elementOrSelector; if (function.isConstructor) { isConstructor = true; name = Elements.reconstructConstructorName(function); } FunctionSignature signature = function.functionSignature; positionalParameterCount = signature.requiredParameterCount; if (signature.optionalParametersAreNamed) { var names = []; for (Element e in signature.optionalParameters) { names.add(e.name); } CallStructure callStructure = new CallStructure(positionalParameterCount, names); namedArguments = namedParametersAsReflectionNames(callStructure); } else { // Named parameters are handled differently by mirrors. For unnamed // parameters, they are actually required if invoked // reflectively. Also, if you have a method c(x) and c([x]) they both // get the same mangled name, so they must have the same reflection // name. positionalParameterCount += signature.optionalParameterCount; } } String suffix = '$name:$positionalParameterCount$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; } else if (element.isTypedef) { return element.name; } throw compiler.internalError(element, 'Do not know how to reflect on this $element.'); } String namedParametersAsReflectionNames(CallStructure structure) { if (structure.isUnnamed) return ''; String names = structure.getOrderedNamedArguments().join(':'); return ':$names'; } jsAst.Statement buildCspPrecompiledFunctionFor( OutputUnit outputUnit) { // TODO(ahe): Compute a hash code. // TODO(sigurdm): Avoid this precompiled function. Generated // constructor-functions and getter/setter functions can be stored in the // library-description table. Setting properties on these can be moved to // finishClasses. return js.statement(''' # = function (\$collectedClasses) { var \$desc; #; return #; };''', [generateEmbeddedGlobalAccess(embeddedNames.PRECOMPILED), cspPrecompiledFunctionFor(outputUnit), new jsAst.ArrayInitializer( cspPrecompiledConstructorNamesFor(outputUnit))]); } void emitClass(Class cls, ClassBuilder enclosingBuilder) { ClassElement classElement = cls.element; compiler.withCurrentElement(classElement, () { if (compiler.hasIncrementalSupport) { ClassBuilder cachedBuilder = cachedClassBuilders.putIfAbsent(classElement, () { ClassBuilder builder = new ClassBuilder(classElement, namer); classEmitter.emitClass(cls, builder); return builder; }); invariant(classElement, cachedBuilder.fields.isEmpty); invariant(classElement, cachedBuilder.superName == null); invariant(classElement, cachedBuilder.functionType == null); invariant(classElement, cachedBuilder.fieldMetadata == null); enclosingBuilder.properties.addAll(cachedBuilder.properties); } else { classEmitter.emitClass(cls, enclosingBuilder); } }); } void emitStaticFunctions(Iterable<Method> staticFunctions) { if (staticFunctions == null) return; for (Method method in staticFunctions) { Element element = method.element; // We need to filter out null-elements for the interceptors. // TODO(floitsch): use the precomputed interceptors here. if (element == null) continue; ClassBuilder builder = new ClassBuilder(element, namer); containerBuilder.addMemberMethod(method, builder); getElementDescriptor(element).properties.addAll(builder.properties); } } void emitStaticNonFinalFieldInitializations(CodeOutput output, OutputUnit outputUnit) { void emitInitialization(Element element, jsAst.Expression initialValue) { jsAst.Expression init = js('$isolateProperties.# = #', [namer.globalPropertyName(element), initialValue]); output.addBuffer(jsAst.prettyPrint(init, compiler, monitor: compiler.dumpInfoTask)); output.add('$N'); } bool inMainUnit = (outputUnit == compiler.deferredLoadTask.mainOutputUnit); JavaScriptConstantCompiler handler = backend.constants; Iterable<Element> fields = task.outputStaticNonFinalFieldLists[outputUnit]; // If the outputUnit does not contain any static non-final fields, then // [fields] is `null`. if (fields != null) { for (Element element in fields) { compiler.withCurrentElement(element, () { ConstantValue constant = handler.getInitialValueFor(element).value; emitInitialization(element, constantReference(constant)); }); } } if (inMainUnit && task.outputStaticNonFinalFieldLists.length > 1) { // In the main output-unit we output a stub initializer for deferred // variables, so that `isolateProperties` stays a fast object. task.outputStaticNonFinalFieldLists.forEach( (OutputUnit fieldsOutputUnit, Iterable<VariableElement> fields) { if (fieldsOutputUnit == outputUnit) return; // Skip the main unit. for (Element element in fields) { compiler.withCurrentElement(element, () { emitInitialization(element, jsAst.number(0)); }); } }); } } void emitLazilyInitializedStaticFields(CodeOutput output) { JavaScriptConstantCompiler handler = backend.constants; List<VariableElement> lazyFields = handler.getLazilyInitializedFieldsForEmission(); if (!lazyFields.isEmpty) { needsLazyInitializer = true; List<jsAst.Expression> laziesInfo = buildLaziesInfo(lazyFields); jsAst.Statement code = js.statement(''' (function(lazies) { if (#notInMinifiedMode) { var descriptorLength = 4; } else { var descriptorLength = 3; } for (var i = 0; i < lazies.length; i += descriptorLength) { var fieldName = lazies [i]; var getterName = lazies[i + 1]; var lazyValue = lazies[i + 2]; if (#notInMinifiedMode) { var staticName = lazies[i + 3]; } // We build the lazy-check here: // lazyInitializer(fieldName, getterName, lazyValue, staticName); // 'staticName' is used for error reporting in non-minified mode. // 'lazyValue' must be a closure that constructs the initial value. if (#notInMinifiedMode) { #lazy(fieldName, getterName, lazyValue, staticName); } else { #lazy(fieldName, getterName, lazyValue); } } })(#laziesInfo) ''', {'notInMinifiedMode': !compiler.enableMinification, 'laziesInfo': new jsAst.ArrayInitializer(laziesInfo), 'lazy': js(lazyInitializerName)}); output.addBuffer( jsAst.prettyPrint(code, compiler, monitor: compiler.dumpInfoTask)); output.add("$N"); } } List<jsAst.Expression> buildLaziesInfo(List<VariableElement> lazies) { List<jsAst.Expression> laziesInfo = <jsAst.Expression>[]; for (VariableElement element in Elements.sortedByPosition(lazies)) { 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; if (compiler.enableMinification) { laziesInfo.addAll([js.string(namer.globalPropertyName(element)), js.string(namer.lazyInitializerName(element)), code]); } else { laziesInfo.addAll([js.string(namer.globalPropertyName(element)), js.string(namer.lazyInitializerName(element)), code, js.string(element.name)]); } } return laziesInfo; } jsAst.Expression buildLazilyInitializedStaticField( VariableElement element, {String isolateProperties}) { 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) return null; // The code only computes the initial value. We build the lazy-check // here: // lazyInitializer(fieldName, getterName, initial, name, prototype); // The name is used for error reporting. The 'initial' must be a // closure that constructs the initial value. if (isolateProperties != null) { // This is currently only used in incremental compilation to patch // in new lazy values. return js('#(#,#,#,#,#)', [js(lazyInitializerName), js.string(namer.globalPropertyName(element)), js.string(namer.lazyInitializerName(element)), code, js.string(element.name), isolateProperties]); } if (compiler.enableMinification) { return js('#(#,#,#)', [js(lazyInitializerName), js.string(namer.globalPropertyName(element)), js.string(namer.lazyInitializerName(element)), code]); } else { return js('#(#,#,#,#)', [js(lazyInitializerName), js.string(namer.globalPropertyName(element)), js.string(namer.lazyInitializerName(element)), code, js.string(element.name)]); } } void emitMetadata(Program program, CodeOutput output) { addMetadataGlobal(List<String> list, String global) { String globalAccess = generateEmbeddedGlobalAccessString(global); output.add('$globalAccess$_=$_['); for (String data in list) { if (data is String) { if (data != 'null') { output.add(data); } } else { throw 'Unexpected value in ${global}: ${Error.safeToString(data)}'; } output.add(',$n'); } output.add('];$n'); } addMetadataGlobal(program.metadata, embeddedNames.METADATA); addMetadataGlobal(program.metadataTypes, embeddedNames.TYPES); } void emitCompileTimeConstants(CodeOutput output, List<Constant> constants, {bool isMainFragment}) { assert(isMainFragment != null); if (constants.isEmpty) return; CodeOutput constantOutput = output; if (compiler.hasIncrementalSupport && isMainFragment) { constantOutput = cachedEmittedConstantsBuffer; } for (Constant constant in constants) { ConstantValue constantValue = constant.value; if (compiler.hasIncrementalSupport && isMainFragment) { if (cachedEmittedConstants.contains(constantValue)) continue; cachedEmittedConstants.add(constantValue); } jsAst.Expression init = buildConstantInitializer(constantValue); constantOutput.addBuffer( jsAst.prettyPrint(init, compiler, monitor: compiler.dumpInfoTask)); constantOutput.add('$N'); } if (compiler.hasIncrementalSupport && isMainFragment) { output.addBuffer(constantOutput); } } jsAst.Expression buildConstantInitializer(ConstantValue constant) { String name = namer.constantName(constant); return js('#.# = #', [namer.globalObjectForConstant(constant), name, constantInitializerExpression(constant)]); } jsAst.Template get makeConstantListTemplate { // TODO(floitsch): there is no harm in caching the template. return jsAst.js.uncachedExpressionTemplate( '${namer.isolateName}.$makeConstListProperty(#)'); } void emitMakeConstantList(CodeOutput output) { output.addBuffer( jsAst.prettyPrint( // Functions are stored in the hidden class and not as properties in // the object. We never actually look at the value, but only want // to know if the property exists. js.statement(r'''#.# = function(list) { list.immutable$list = Array; list.fixed$length = Array; return list; }''', [namer.isolateName, makeConstListProperty]), compiler, monitor: compiler.dumpInfoTask)); output.add(N); } void emitFunctionThatReturnsNull(CodeOutput output) { output.addBuffer( jsAst.prettyPrint( js.statement('#.# = function() {}', [backend.namer.currentIsolate, backend.rti.getFunctionThatReturnsNullName]), compiler, monitor: compiler.dumpInfoTask)); output.add(N); } jsAst.Expression generateFunctionThatReturnsNull() { return js("#.#", [backend.namer.currentIsolate, backend.rti.getFunctionThatReturnsNullName]); } emitMain(CodeOutput output, jsAst.Statement invokeMain) { if (compiler.isMockCompilation) return; if (NativeGenerator.needsIsolateAffinityTagInitialization(backend)) { jsAst.Statement nativeBoilerPlate = NativeGenerator.generateIsolateAffinityTagInitialization( backend, generateEmbeddedGlobalAccess, js("convertToFastObject", [])); output.addBuffer(jsAst.prettyPrint( nativeBoilerPlate, compiler, monitor: compiler.dumpInfoTask)); } output.add(';'); addComment('BEGIN invoke [main].', output); output.addBuffer(jsAst.prettyPrint(invokeMain, compiler, monitor: compiler.dumpInfoTask)); output.add(N); addComment('END invoke [main].', output); } void emitInitFunction(CodeOutput output) { jsAst.Expression allClassesAccess = generateEmbeddedGlobalAccess(embeddedNames.ALL_CLASSES); jsAst.Expression getTypeFromNameAccess = generateEmbeddedGlobalAccess(embeddedNames.GET_TYPE_FROM_NAME); jsAst.Expression interceptorsByTagAccess = generateEmbeddedGlobalAccess(embeddedNames.INTERCEPTORS_BY_TAG); jsAst.Expression leafTagsAccess = generateEmbeddedGlobalAccess(embeddedNames.LEAF_TAGS); jsAst.Expression finishedClassesAccess = generateEmbeddedGlobalAccess(embeddedNames.FINISHED_CLASSES); jsAst.Expression cyclicThrow = staticFunctionAccess(backend.getCyclicThrowHelper()); jsAst.Expression laziesAccess = generateEmbeddedGlobalAccess(embeddedNames.LAZIES); jsAst.FunctionDeclaration decl = js.statement(''' function init() { $isolateProperties = Object.create(null); #allClasses = Object.create(null); #getTypeFromName = function(name) {return #allClasses[name];}; #interceptorsByTag = Object.create(null); #leafTags = Object.create(null); #finishedClasses = Object.create(null); if (#needsLazyInitializer) { // [staticName] is only provided in non-minified mode. If missing, we // fall back to [fieldName]. Likewise, [prototype] is optional and // defaults to the isolateProperties object. $lazyInitializerName = function (fieldName, getterName, lazyValue, staticName, prototype) { if (!#lazies) #lazies = Object.create(null); #lazies[fieldName] = getterName; // 'prototype' will be undefined except if we are doing an update // during incremental compilation. In this case we put the lazy // field directly on the isolate instead of the isolateProperties. prototype = prototype || $isolateProperties; var sentinelUndefined = {}; var sentinelInProgress = {}; prototype[fieldName] = sentinelUndefined; prototype[getterName] = function () { var result = this[fieldName]; try { if (result === sentinelUndefined) { this[fieldName] = sentinelInProgress; try { result = this[fieldName] = lazyValue(); } finally { // Use try-finally, not try-catch/throw as it destroys the // stack trace. if (result === sentinelUndefined) this[fieldName] = null; } } else { if (result === sentinelInProgress) // In minified mode, static name is not provided, so fall // back to the minified fieldName. #cyclicThrow(staticName || fieldName); } return result; } finally { this[getterName] = function() { return this[fieldName]; }; } } } } // 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. $finishIsolateConstructorName = function (oldIsolate) { var isolateProperties = oldIsolate.#isolatePropertiesName; function Isolate() { var staticNames = Object.keys(isolateProperties); for (var i = 0; i < staticNames.length; i++) { var staticName = staticNames[i]; this[staticName] = isolateProperties[staticName]; } // Reset lazy initializers to null. // When forcing the object to fast mode (below) v8 will consider // functions as part the object's map. Since we will change them // (after the first call to the getter), we would have a map // transition. var lazies = init.lazies; var lazyInitializers = lazies ? Object.keys(lazies) : []; for (var i = 0; i < lazyInitializers.length; i++) { this[lazies[lazyInitializers[i]]] = null; } // 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(); // Now, after being a fast map we can set the lazies again. for (var i = 0; i < lazyInitializers.length; i++) { var lazyInitName = lazies[lazyInitializers[i]]; this[lazyInitName] = isolateProperties[lazyInitName]; } } Isolate.prototype = oldIsolate.prototype; Isolate.prototype.constructor = Isolate; Isolate.#isolatePropertiesName = isolateProperties; if (#outputContainsConstantList) { Isolate.#makeConstListProperty = oldIsolate.#makeConstListProperty; } if (#hasIncrementalSupport) { Isolate.#lazyInitializerProperty = oldIsolate.#lazyInitializerProperty; } return Isolate; } }''', {'allClasses': allClassesAccess, 'getTypeFromName': getTypeFromNameAccess, 'interceptorsByTag': interceptorsByTagAccess, 'leafTags': leafTagsAccess, 'finishedClasses': finishedClassesAccess, 'needsLazyInitializer': needsLazyInitializer, 'lazies': laziesAccess, 'cyclicThrow': cyclicThrow, 'isolatePropertiesName': namer.isolatePropertiesName, 'outputContainsConstantList': task.outputContainsConstantList, 'makeConstListProperty': makeConstListProperty, 'hasIncrementalSupport': compiler.hasIncrementalSupport, 'lazyInitializerProperty': lazyInitializerProperty,}); output.addBuffer( jsAst.prettyPrint(decl, compiler, monitor: compiler.dumpInfoTask)); if (compiler.enableMinification) { output.add('\n'); } } void emitConvertToFastObjectFunction(CodeOutput output) { List<jsAst.Statement> debugCode = <jsAst.Statement>[]; if (DEBUG_FAST_OBJECTS) { debugCode.add(js.statement(r''' // The following only works on V8 when run with option // "--allow-natives-syntax". We use'new Function' because the // miniparser does not understand V8 native syntax. if (typeof print === "function") { var HasFastProperties = new Function("a", "return %HasFastProperties(a)"); print("Size of global object: " + String(Object.getOwnPropertyNames(properties).length) + ", fast properties " + HasFastProperties(properties)); }''')); } jsAst.Statement convertToFastObject = js.statement(r''' function convertToFastObject(properties) { // Create an instance that uses 'properties' as prototype. This should // make 'properties' a fast object. function MyClass() {}; MyClass.prototype = properties; new MyClass(); #; return properties; }''', [debugCode]); output.addBuffer(jsAst.prettyPrint(convertToFastObject, compiler)); output.add(N); } void emitConvertToSlowObjectFunction(CodeOutput output) { jsAst.Statement convertToSlowObject = js.statement(r''' function convertToSlowObject(properties) { // Add and remove a property to make the object transition into hashmap // mode. properties.__MAGIC_SLOW_PROPERTY = 1; delete properties.__MAGIC_SLOW_PROPERTY; return properties; }'''); output.addBuffer(jsAst.prettyPrint(convertToSlowObject, compiler)); output.add(N); } void emitSupportsDirectProtoAccess(CodeOutput output) { jsAst.Statement supportsDirectProtoAccess; if (compiler.hasIncrementalSupport) { supportsDirectProtoAccess = js.statement(r''' var supportsDirectProtoAccess = false; '''); } else { supportsDirectProtoAccess = js.statement(r''' var supportsDirectProtoAccess = (function () { var cls = function () {}; cls.prototype = {'p': {}}; var object = new cls(); return object.__proto__ && object.__proto__.p === cls.prototype.p; })(); '''); } output.addBuffer(jsAst.prettyPrint(supportsDirectProtoAccess, compiler)); output.add(N); } void writeLibraryDescriptor(CodeOutput output, LibraryElement library) { var uri = ""; if (!compiler.enableMinification || backend.mustPreserveUris) { uri = library.canonicalUri; if (uri.scheme == 'file' && compiler.outputUri != null) { uri = relativize(compiler.outputUri, library.canonicalUri, false); } } ClassBuilder descriptor = elementDescriptors[library]; if (descriptor == null) { // Nothing of the library was emitted. // TODO(floitsch): this should not happen. We currently have an example // with language/prefix6_negative_test.dart where we have an instance // method without its corresponding class. return; } String libraryName = (!compiler.enableMinification || backend.mustRetainLibraryNames) ? library.getLibraryName() : ""; jsAst.Fun metadata = task.metadataCollector.buildMetadataFunction(library); jsAst.ObjectInitializer initializers = descriptor.toObjectInitializer(); compiler.dumpInfoTask.registerElementAst(library, metadata); compiler.dumpInfoTask.registerElementAst(library, initializers); output ..add('["$libraryName",$_') ..add('"${uri}",$_'); if (metadata != null) { output.addBuffer(jsAst.prettyPrint(metadata, compiler, monitor: compiler.dumpInfoTask)); } output ..add(',$_') ..add(namer.globalObjectFor(library)) ..add(',$_') ..addBuffer(jsAst.prettyPrint(initializers, compiler, monitor: compiler.dumpInfoTask)) ..add(library == compiler.mainApp ? ',${n}1' : "") ..add('],$n'); } void emitPrecompiledConstructor(OutputUnit outputUnit, String constructorName, jsAst.Expression constructorAst, List<String> fields) { cspPrecompiledFunctionFor(outputUnit).add( new jsAst.FunctionDeclaration( new jsAst.VariableDeclaration(constructorName), constructorAst)); String fieldNamesProperty = FIELD_NAMES_PROPERTY_NAME; bool hasIsolateSupport = compiler.hasIsolateSupport; jsAst.Node fieldNamesArray = hasIsolateSupport ? js.stringArray(fields) : new jsAst.LiteralNull(); cspPrecompiledFunctionFor(outputUnit).add(js.statement(r''' { #constructorName.builtin$cls = #constructorNameString; if (!"name" in #constructorName) #constructorName.name = #constructorNameString; $desc = $collectedClasses.#constructorName[1]; #constructorName.prototype = $desc; ''' /* next string is not a raw string */ ''' if (#hasIsolateSupport) { #constructorName.$fieldNamesProperty = #fieldNamesArray; } }''', {"constructorName": constructorName, "constructorNameString": js.string(constructorName), "hasIsolateSupport": hasIsolateSupport, "fieldNamesArray": fieldNamesArray})); cspPrecompiledConstructorNamesFor(outputUnit).add(js('#', constructorName)); } void emitTypedefs() { OutputUnit mainOutputUnit = compiler.deferredLoadTask.mainOutputUnit; // Emit all required typedef declarations into the main output unit. // TODO(karlklose): unify required classes and typedefs to declarations // and have builders for each kind. for (TypedefElement typedef in typedefsNeededForReflection) { LibraryElement library = typedef.library; // TODO(karlklose): add a TypedefBuilder and move this code there. DartType type = typedef.alias; int typeIndex = task.metadataCollector.reifyType(type); ClassBuilder builder = new ClassBuilder(typedef, namer); builder.addProperty(embeddedNames.TYPEDEF_TYPE_PROPERTY_NAME, js.number(typeIndex)); builder.addProperty(embeddedNames.TYPEDEF_PREDICATE_PROPERTY_NAME, js.boolean(true)); // We can be pretty sure that the objectClass is initialized, since // typedefs are only emitted with reflection, which requires lots of // classes. assert(compiler.objectClass != null); builder.superName = namer.className(compiler.objectClass); jsAst.Node declaration = builder.toObjectInitializer(); String mangledName = namer.globalPropertyName(typedef); String reflectionName = getReflectionName(typedef, mangledName); getElementDescriptor(library) ..addProperty(mangledName, declaration) ..addProperty("+$reflectionName", js.string('')); // Also emit a trivial constructor for CSP mode. String constructorName = mangledName; jsAst.Expression constructorAst = js('function() {}'); List<String> fieldNames = []; emitPrecompiledConstructor(mainOutputUnit, constructorName, constructorAst, fieldNames); } } void emitMangledNames(CodeOutput output) { if (!mangledFieldNames.isEmpty) { var keys = mangledFieldNames.keys.toList(); keys.sort(); var properties = []; for (String key in keys) { var value = js.string('${mangledFieldNames[key]}'); properties.add(new jsAst.Property(js.string(key), value)); } jsAst.Expression mangledNamesAccess = generateEmbeddedGlobalAccess(embeddedNames.MANGLED_NAMES); var map = new jsAst.ObjectInitializer(properties); output.addBuffer( jsAst.prettyPrint( js.statement('# = #', [mangledNamesAccess, map]), compiler, monitor: compiler.dumpInfoTask)); if (compiler.enableMinification) { output.add(';'); } } 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)); } jsAst.Expression mangledGlobalNamesAccess = generateEmbeddedGlobalAccess(embeddedNames.MANGLED_GLOBAL_NAMES); var map = new jsAst.ObjectInitializer(properties); output.addBuffer( jsAst.prettyPrint( js.statement('# = #', [mangledGlobalNamesAccess, map]), compiler, monitor: compiler.dumpInfoTask)); if (compiler.enableMinification) { output.add(';'); } } } void checkEverythingEmitted(Iterable<Element> elements) { List<Element> pendingStatics; if (!compiler.hasIncrementalSupport) { pendingStatics = Elements.sortedByPosition(elements.where((e) => !e.isLibrary)); pendingStatics.forEach((element) => compiler.reportInfo( element, MessageKind.GENERIC, {'text': 'Pending statics.'})); } if (pendingStatics != null && !pendingStatics.isEmpty) { compiler.internalError(pendingStatics.first, 'Pending statics (see above).'); } } void emitLibrary(Library library) { LibraryElement libraryElement = library.element; emitStaticFunctions(library.statics); ClassBuilder libraryBuilder = getElementDescriptor(libraryElement); for (Class cls in library.classes) { emitClass(cls, libraryBuilder); } classEmitter.emitFields(library, libraryBuilder, emitStatics: true); } void emitMainOutputUnit(Program program, Map<OutputUnit, String> deferredLoadHashes) { MainFragment mainFragment = program.fragments.first; OutputUnit mainOutputUnit = mainFragment.outputUnit; LineColumnCollector lineColumnCollector; List<CodeOutputListener> codeOutputListeners; if (generateSourceMap) { lineColumnCollector = new LineColumnCollector(); codeOutputListeners = <CodeOutputListener>[lineColumnCollector]; } CodeOutput mainOutput = new StreamCodeOutput(compiler.outputProvider('', 'js'), codeOutputListeners); outputBuffers[mainOutputUnit] = mainOutput; bool isProgramSplit = program.isSplit; mainOutput.add(buildGeneratedBy()); addComment(HOOKS_API_USAGE, mainOutput); if (isProgramSplit) { /// For deferred loading we communicate the initializers via this global /// variable. The deferred hunks will add their initialization to this. /// The semicolon is important in minified mode, without it the /// following parenthesis looks like a call to the object literal. mainOutput.add( 'self.${deferredInitializers} = self.${deferredInitializers} || ' 'Object.create(null);$n'); } // Using a named function here produces easier to read stack traces in // Chrome/V8. mainOutput.add('(function(${namer.currentIsolate})$_{\n'); emitSupportsDirectProtoAccess(mainOutput); if (compiler.hasIncrementalSupport) { mainOutput.addBuffer(jsAst.prettyPrint(js.statement( """ { #helper = #helper || Object.create(null); #helper.patch = function(a) { eval(a)}; #helper.schemaChange = #schemaChange; #helper.addMethod = #addMethod; #helper.extractStubs = function(array, name, isStatic, originalDescriptor) { var descriptor = Object.create(null); this.addStubs(descriptor, array, name, isStatic, []); return descriptor; }; }""", { 'helper': js('this.#', [namer.incrementalHelperName]), 'schemaChange': buildSchemaChangeFunction(), 'addMethod': buildIncrementalAddMethod() }), compiler)); } if (isProgramSplit) { /// We collect all the global state, so it can be passed to the /// initializer of deferred files. mainOutput.add('var ${globalsHolder}$_=${_}Object.create(null)$N'); } jsAst.Statement mapFunction = js.statement(''' // [map] returns an object that V8 shouldn't try to optimize with a hidden // class. This prevents a potential performance problem where V8 tries to build // a hidden class for an object used as a hashMap. // It requires fewer characters to declare a variable as a parameter than // with `var`. function map(x) { x = Object.create(null); x.x = 0; delete x.x; return x; } '''); mainOutput.addBuffer(jsAst.prettyPrint(mapFunction, compiler)); 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]). mainOutput.add('var ${globalObject}$_=${_}'); if(isProgramSplit) { mainOutput.add('${globalsHolder}.$globalObject$_=${_}'); } mainOutput.add('map()$N'); } mainOutput.add('function ${namer.isolateName}()$_{}\n'); if (isProgramSplit) { mainOutput.add( '${globalsHolder}.${namer.isolateName}$_=$_${namer.isolateName}$N' '${globalsHolder}.$initName$_=${_}$initName$N' '${globalsHolder}.$setupProgramName$_=$_' '$setupProgramName$N'); } mainOutput.add('init()$N$n'); mainOutput.add('$isolateProperties$_=$_$isolatePropertiesName$N'); emitFunctionThatReturnsNull(mainOutput); mainFragment.libraries.forEach(emitLibrary); Iterable<LibraryElement> libraries = task.outputLibraryLists[mainOutputUnit]; if (libraries == null) libraries = []; emitTypedefs(); emitMangledNames(mainOutput); checkEverythingEmitted(elementDescriptors.keys); CodeBuffer libraryBuffer = new CodeBuffer(); for (LibraryElement library in Elements.sortedByPosition(libraries)) { writeLibraryDescriptor(libraryBuffer, library); elementDescriptors.remove(library); } if (elementDescriptors.isNotEmpty) { List<Element> remainingLibraries = elementDescriptors.keys .where((Element e) => e is LibraryElement) .toList(); // The remaining descriptors are only accessible through reflection. // The program builder does not collect libraries that only // contain typedefs that are used for reflection. for (LibraryElement element in remainingLibraries) { assert(element is LibraryElement || compiler.hasIncrementalSupport); if (element is LibraryElement) { writeLibraryDescriptor(libraryBuffer, element); elementDescriptors.remove(element); } } } bool needsNativeSupport = program.needsNativeSupport; mainOutput.addBuffer( jsAst.prettyPrint( buildSetupProgram(program, compiler, backend, namer, this), compiler)); // The argument to reflectionDataParser is assigned to a temporary 'dart' // so that 'dart.' will appear as the prefix to dart methods in stack // traces and profile entries. mainOutput..add('var dart = [$n') ..addBuffer(libraryBuffer) ..add(']$N'); if (compiler.useContentSecurityPolicy) { jsAst.Statement precompiledFunctionAst = buildCspPrecompiledFunctionFor(mainOutputUnit); mainOutput.addBuffer( jsAst.prettyPrint( precompiledFunctionAst, compiler, monitor: compiler.dumpInfoTask, allowVariableMinification: false)); mainOutput.add(N); } mainOutput.add('$setupProgramName(dart)$N'); interceptorEmitter.emitGetInterceptorMethods(mainOutput); interceptorEmitter.emitOneShotInterceptors(mainOutput); if (task.outputContainsConstantList) { emitMakeConstantList(mainOutput); } // Constants in checked mode call into RTI code to set type information // which may need getInterceptor (and one-shot interceptor) methods, so // we have to make sure that [emitGetInterceptorMethods] and // [emitOneShotInterceptors] have been called. emitCompileTimeConstants( mainOutput, mainFragment.constants, isMainFragment: true); emitDeferredBoilerPlate(mainOutput, deferredLoadHashes); if (compiler.deferredMapUri != null) { outputDeferredMap(); } // Static field initializations require the classes and compile-time // constants to be set up. emitStaticNonFinalFieldInitializations(mainOutput, mainOutputUnit); interceptorEmitter.emitTypeToInterceptorMap(program, mainOutput); if (compiler.enableMinification) { mainOutput.add(';'); } emitLazilyInitializedStaticFields(mainOutput); mainOutput.add('\n'); emitMetadata(program, mainOutput); isolateProperties = isolatePropertiesName; // The following code should not use the short-hand for the // initialStatics. mainOutput.add('${namer.currentIsolate}$_=${_}null$N'); emitFinishIsolateConstructorInvocation(mainOutput); mainOutput.add( '${namer.currentIsolate}$_=${_}new ${namer.isolateName}()$N'); emitConvertToFastObjectFunction(mainOutput); emitConvertToSlowObjectFunction(mainOutput); for (String globalObject in Namer.reservedGlobalObjectNames) { mainOutput.add('$globalObject = convertToFastObject($globalObject)$N'); } if (DEBUG_FAST_OBJECTS) { mainOutput.add(r''' // The following only works on V8 when run with option // "--allow-natives-syntax". We use'new Function' because the // miniparser does not understand V8 native syntax. if (typeof print === "function") { var HasFastProperties = new Function("a", "return %HasFastProperties(a)"); print("Size of global helper object: " + String(Object.getOwnPropertyNames(H).length) + ", fast properties " + HasFastProperties(H)); print("Size of global platform object: " + String(Object.getOwnPropertyNames(P).length) + ", fast properties " + HasFastProperties(P)); print("Size of global dart:html object: " + String(Object.getOwnPropertyNames(W).length) + ", fast properties " + HasFastProperties(W)); print("Size of isolate properties object: " + String(Object.getOwnPropertyNames($).length) + ", fast properties " + HasFastProperties($)); print("Size of constant object: " + String(Object.getOwnPropertyNames(C).length) + ", fast properties " + HasFastProperties(C)); var names = Object.getOwnPropertyNames($); for (var i = 0; i < names.length; i++) { print("$." + names[i]); } } '''); for (String object in Namer.userGlobalObjects) { mainOutput.add(''' if (typeof print === "function") { print("Size of $object: " + String(Object.getOwnPropertyNames($object).length) + ", fast properties " + HasFastProperties($object)); } '''); } } emitInitFunction(mainOutput); emitMain(mainOutput, mainFragment.invokeMain); mainOutput.add('})()\n'); if (generateSourceMap) { mainOutput.add( generateSourceMapTag(compiler.sourceMapUri, compiler.outputUri)); } mainOutput.close(); if (generateSourceMap) { outputSourceMap(mainOutput, lineColumnCollector, '', compiler.sourceMapUri, compiler.outputUri); } } /// Used by incremental compilation to patch up the prototype of /// [oldConstructor] for use as prototype of [newConstructor]. jsAst.Fun buildSchemaChangeFunction() { return js(''' function(newConstructor, oldConstructor, superclass) { // Invariant: newConstructor.prototype has no interesting properties besides // generated accessors. These are copied to oldPrototype which will be // updated by other incremental changes. if (superclass != null) { this.inheritFrom(newConstructor, superclass); } var oldPrototype = oldConstructor.prototype; var newPrototype = newConstructor.prototype; var hasOwnProperty = Object.prototype.hasOwnProperty; for (var property in newPrototype) { if (hasOwnProperty.call(newPrototype, property)) { // Copy generated accessors. oldPrototype[property] = newPrototype[property]; } } oldPrototype.__proto__ = newConstructor.prototype.__proto__; oldPrototype.constructor = newConstructor; newConstructor.prototype = oldPrototype; return newConstructor; }'''); } /// Used by incremental compilation to patch up an object ([holder]) with a /// new (or updated) method. [arrayOrFunction] is either the new method, or /// an array containing the method (see /// [ContainerBuilder.addMemberMethodFromInfo]). [name] is the name of the /// new method. [isStatic] tells if method is static (or /// top-level). [globalFunctionsAccess] is a reference to /// [embeddedNames.GLOBAL_FUNCTIONS]. jsAst.Fun buildIncrementalAddMethod() { return js(r""" function(originalDescriptor, name, holder, isStatic, globalFunctionsAccess) { var arrayOrFunction = originalDescriptor[name]; var method; if (arrayOrFunction.constructor === Array) { var existing = holder[name]; var array = arrayOrFunction; // Each method may have a number of stubs associated. For example, if an // instance method supports multiple arguments, a stub for each matching // selector. There is also a getter stub for tear-off getters. For example, // an instance method foo([a]) may have the following stubs: foo$0, foo$1, // and get$foo (here exemplified using unminified names). // [extractStubs] returns a JavaScript object whose own properties // corresponds to the stubs. var descriptor = this.extractStubs(array, name, isStatic, originalDescriptor); method = descriptor[name]; // Iterate through the properties of descriptor and copy the stubs to the // existing holder (for instance methods, a prototype). for (var property in descriptor) { if (!Object.prototype.hasOwnProperty.call(descriptor, property)) continue; var stub = descriptor[property]; var existingStub = holder[property]; if (stub === method || !existingStub || !stub.$getterStub) { // Not replacing an existing getter stub. holder[property] = stub; continue; } if (!stub.$getterStub) { var error = new Error('Unexpected stub.'); error.stub = stub; throw error; } // Existing getter stubs need special treatment as they may already have // been called and produced a closure. this.pendingStubs = this.pendingStubs || []; // It isn't safe to invoke the stub yet. this.pendingStubs.push((function(holder, stub, existingStub, existing, method) { return function() { var receiver = isStatic ? holder : new holder.constructor(); // Invoke the existing stub to obtain the tear-off closure. existingStub = existingStub.call(receiver); // Invoke the new stub to create a tear-off closure we can use as a // prototype. stub = stub.call(receiver); // Copy the properties from the new tear-off's prototype to the // prototype of the existing tear-off. var newProto = stub.constructor.prototype; var existingProto = existingStub.constructor.prototype; for (var stubProperty in newProto) { if (!Object.prototype.hasOwnProperty.call(newProto, stubProperty)) continue; existingProto[stubProperty] = newProto[stubProperty]; } // Update all the existing stub's references to [existing] to // [method]. Instance tear-offs are call-by-name, so this isn't // necessary for those. if (!isStatic) return; for (var reference in existingStub) { if (existingStub[reference] === existing) { existingStub[reference] = method; } } } })(holder, stub, existingStub, existing, method)); } } else { method = arrayOrFunction; holder[name] = method; } if (isStatic) globalFunctionsAccess[name] = method; }"""); } /// Returns a map from OutputUnit to a hash of its content. The hash uniquely /// identifies the code of the output-unit. It does not include /// boilerplate JS code, like the sourcemap directives or the hash /// itself. Map<OutputUnit, String> emitDeferredOutputUnits(Program program) { if (!program.isSplit) return const {}; Map<OutputUnit, CodeBuffer> outputBuffers = new Map<OutputUnit, CodeBuffer>(); for (Fragment fragment in program.deferredFragments) { OutputUnit outputUnit = fragment.outputUnit; fragment.libraries.forEach(emitLibrary); if (elementDescriptors.isNotEmpty) { Iterable<LibraryElement> libraries = task.outputLibraryLists[outputUnit]; if (libraries == null) libraries = []; // TODO(johnniwinther): Avoid creating [CodeBuffer]s. CodeBuffer buffer = new CodeBuffer(); outputBuffers[outputUnit] = buffer; for (LibraryElement library in Elements.sortedByPosition(libraries)) { writeLibraryDescriptor(buffer, library); elementDescriptors.remove(library); } } } return emitDeferredCode(program, outputBuffers); } int emitProgram(ProgramBuilder programBuilder) { Program program = programBuilder.buildProgram( storeFunctionTypesInMetadata: true); // Shorten the code by using [namer.currentIsolate] as temporary. isolateProperties = namer.currentIsolate; // Emit deferred units first, so we have their hashes. // Map from OutputUnit to a hash of its content. The hash uniquely // identifies the code of the output-unit. It does not include // boilerplate JS code, like the sourcemap directives or the hash // itself. Map<OutputUnit, String> deferredLoadHashes = emitDeferredOutputUnits(program); emitMainOutputUnit(program, deferredLoadHashes); if (backend.requiresPreamble && !backend.htmlLibraryIsLoaded) { compiler.reportHint(NO_LOCATION_SPANNABLE, MessageKind.PREAMBLE); } // Return the total program size. return outputBuffers.values.fold(0, (a, b) => a + b.length); } String generateSourceMapTag(Uri sourceMapUri, Uri fileUri) { if (sourceMapUri != null && fileUri != null) { String sourceMapFileName = relativize(fileUri, sourceMapUri, false); return ''' //# sourceMappingURL=$sourceMapFileName '''; } return ''; } ClassBuilder getElementDescriptor(Element element) { Element owner = element.library; if (!element.isLibrary && !element.isTopLevel && !element.isNative) { // For static (not top level) elements, record their code in a buffer // specific to the class. For now, not supported for native classes and // native elements. ClassElement cls = element.enclosingClassOrCompilationUnit.declaration; if (compiler.codegenWorld.directlyInstantiatedClasses.contains(cls) && !cls.isNative && compiler.deferredLoadTask.outputUnitForElement(element) == compiler.deferredLoadTask.outputUnitForElement(cls)) { owner = cls; } } if (owner == null) { compiler.internalError(element, 'Owner is null.'); } return elementDescriptors.putIfAbsent( owner, () => new ClassBuilder(owner, namer)); } /// Emits support-code for deferred loading into [output]. void emitDeferredBoilerPlate(CodeOutput output, Map<OutputUnit, String> deferredLoadHashes) { jsAst.Statement functions = js.statement(''' { // Function for checking if a hunk is loaded given its hash. #isHunkLoaded = function(hunkHash) { return !!$deferredInitializers[hunkHash]; }; #deferredInitialized = new Object(null); // Function for checking if a hunk is initialized given its hash. #isHunkInitialized = function(hunkHash) { return #deferredInitialized[hunkHash]; }; // Function for initializing a loaded hunk, given its hash. #initializeLoadedHunk = function(hunkHash) { $deferredInitializers[hunkHash]( $globalsHolder, ${namer.currentIsolate}); #deferredInitialized[hunkHash] = true; }; } ''', {"isHunkLoaded": generateEmbeddedGlobalAccess( embeddedNames.IS_HUNK_LOADED), "isHunkInitialized": generateEmbeddedGlobalAccess( embeddedNames.IS_HUNK_INITIALIZED), "initializeLoadedHunk": generateEmbeddedGlobalAccess( embeddedNames.INITIALIZE_LOADED_HUNK), "deferredInitialized": generateEmbeddedGlobalAccess( embeddedNames.DEFERRED_INITIALIZED)}); output.addBuffer(jsAst.prettyPrint(functions, compiler, monitor: compiler.dumpInfoTask)); // Write a javascript mapping from Deferred import load ids (derrived // from the import prefix.) to a list of lists of uris of hunks to load, // and a corresponding mapping to a list of hashes used by // INITIALIZE_LOADED_HUNK and IS_HUNK_LOADED. Map<String, List<String>> deferredLibraryUris = new Map<String, List<String>>(); Map<String, List<String>> deferredLibraryHashes = new Map<String, List<String>>(); compiler.deferredLoadTask.hunksToLoad.forEach( (String loadId, List<OutputUnit>outputUnits) { List<String> uris = new List<String>(); List<String> hashes = new List<String>(); deferredLibraryHashes[loadId] = new List<String>(); for (OutputUnit outputUnit in outputUnits) { uris.add(backend.deferredPartFileName(outputUnit.name)); hashes.add(deferredLoadHashes[outputUnit]); } deferredLibraryUris[loadId] = uris; deferredLibraryHashes[loadId] = hashes; }); void emitMapping(String name, Map<String, List<String>> mapping) { List<jsAst.Property> properties = new List<jsAst.Property>(); mapping.forEach((String key, List<String> values) { properties.add(new jsAst.Property(js.escapedString(key), new jsAst.ArrayInitializer( values.map(js.escapedString).toList()))); }); jsAst.Node initializer = new jsAst.ObjectInitializer(properties, isOneLiner: true); jsAst.Node globalName = generateEmbeddedGlobalAccess(name); output.addBuffer(jsAst.prettyPrint( js("# = #", [globalName, initializer]), compiler, monitor: compiler.dumpInfoTask)); output.add('$N'); } emitMapping(embeddedNames.DEFERRED_LIBRARY_URIS, deferredLibraryUris); emitMapping(embeddedNames.DEFERRED_LIBRARY_HASHES, deferredLibraryHashes); } /// Emits code for all output units except the main. /// Returns a mapping from outputUnit to a hash of the corresponding hunk that /// can be used for calling the initializer. Map<OutputUnit, String> emitDeferredCode( Program program, Map<OutputUnit, CodeBuffer> deferredBuffers) { Map<OutputUnit, String> hunkHashes = new Map<OutputUnit, String>(); for (Fragment fragment in program.deferredFragments) { OutputUnit outputUnit = fragment.outputUnit; CodeOutput libraryDescriptorBuffer = deferredBuffers[outputUnit]; List<CodeOutputListener> outputListeners = <CodeOutputListener>[]; Hasher hasher = new Hasher(); outputListeners.add(hasher); LineColumnCollector lineColumnCollector; if (generateSourceMap) { lineColumnCollector = new LineColumnCollector(); outputListeners.add(lineColumnCollector); } String partPrefix = backend.deferredPartFileName(outputUnit.name, addExtension: false); CodeOutput output = new StreamCodeOutput( compiler.outputProvider(partPrefix, 'part.js'), outputListeners); outputBuffers[outputUnit] = output; output ..add(buildGeneratedBy()) ..add('${deferredInitializers}.current$_=$_' 'function$_(${globalsHolder}) {$N'); for (String globalObject in Namer.reservedGlobalObjectNames) { output .add('var $globalObject$_=$_' '${globalsHolder}.$globalObject$N'); } output ..add('var init$_=$_${globalsHolder}.init$N') ..add('var $setupProgramName$_=$_' '$globalsHolder.$setupProgramName$N') ..add('var ${namer.isolateName}$_=$_' '${globalsHolder}.${namer.isolateName}$N'); if (libraryDescriptorBuffer != null) { // 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. output ..add('var ${namer.currentIsolate}$_=$_$isolatePropertiesName$N') // The argument to reflectionDataParser is assigned to a temporary // 'dart' so that 'dart.' will appear as the prefix to dart methods // in stack traces and profile entries. ..add('var dart = [$n ') ..addBuffer(libraryDescriptorBuffer) ..add(']$N'); if (compiler.useContentSecurityPolicy) { jsAst.Statement precompiledFunctionAst = buildCspPrecompiledFunctionFor(outputUnit); output.addBuffer( jsAst.prettyPrint( precompiledFunctionAst, compiler, monitor: compiler.dumpInfoTask, allowVariableMinification: false)); output.add(N); } output.add('$setupProgramName(dart)$N'); } // Set the currentIsolate variable to the current isolate (which is // provided as second argument). // We need to do this, because we use the same variable for setting up // the isolate-properties and for storing the current isolate. During // the setup (the code above this lines) we must set the variable to // the isolate-properties. // After we have done the setup it must point to the current Isolate. // Otherwise all methods/functions accessing isolate variables will // access the wrong object. output.add("${namer.currentIsolate}$_=${_}arguments[1]$N"); emitCompileTimeConstants( output, fragment.constants, isMainFragment: false); emitStaticNonFinalFieldInitializations(output, outputUnit); output.add('}$N'); // Make a unique hash of the code (before the sourcemaps are added) // This will be used to retrieve the initializing function from the global // variable. String hash = hasher.getHash(); output.add('${deferredInitializers}["$hash"]$_=$_' '${deferredInitializers}.current$N'); if (generateSourceMap) { Uri mapUri, partUri; Uri sourceMapUri = compiler.sourceMapUri; Uri outputUri = compiler.outputUri; String partName = "$partPrefix.part"; if (sourceMapUri != null) { String mapFileName = partName + ".js.map"; List<String> mapSegments = sourceMapUri.pathSegments.toList(); mapSegments[mapSegments.length - 1] = mapFileName; mapUri = compiler.sourceMapUri.replace(pathSegments: mapSegments); } if (outputUri != null) { String partFileName = partName + ".js"; List<String> partSegments = outputUri.pathSegments.toList(); partSegments[partSegments.length - 1] = partFileName; partUri = compiler.outputUri.replace(pathSegments: partSegments); } output.add(generateSourceMapTag(mapUri, partUri)); output.close(); outputSourceMap(output, lineColumnCollector, partName, mapUri, partUri); } else { output.close(); } hunkHashes[outputUnit] = hash; } return hunkHashes; } String buildGeneratedBy() { var suffix = ''; if (compiler.hasBuildId) suffix = ' version: ${compiler.buildId}'; return '// Generated by dart2js, the Dart to JavaScript compiler$suffix.\n'; } void outputSourceMap(CodeOutput output, LineColumnProvider lineColumnProvider, 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]. SourceMapBuilder sourceMapBuilder = new SourceMapBuilder(sourceMapUri, fileUri, lineColumnProvider); output.forEachSourceLocation(sourceMapBuilder.addMapping); String sourceMap = sourceMapBuilder.build(); compiler.outputProvider(name, 'js.map') ..add(sourceMap) ..close(); } void outputDeferredMap() { Map<String, dynamic> mapping = new Map<String, dynamic>(); // Json does not support comments, so we embed the explanation in the // data. mapping["_comment"] = "This mapping shows which compiled `.js` files are " "needed for a given deferred library import."; mapping.addAll(compiler.deferredLoadTask.computeDeferredMap()); compiler.outputProvider(compiler.deferredMapUri.path, 'deferred_map') ..add(const JsonEncoder.withIndent(" ").convert(mapping)) ..close(); } void invalidateCaches() { if (!compiler.hasIncrementalSupport) return; if (cachedElements.isEmpty) return; for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) { if (element.isInstanceMember) { cachedClassBuilders.remove(element.enclosingClass); nativeEmitter.cachedBuilders.remove(element.enclosingClass); } } } }