Linter Demo

Errors: 22

Warnings: 212

File: /home/fstrocco/Dart/dart/benchmark/compiler/lib/src/resolution/members.dart

// 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 resolution; abstract class TreeElements { AnalyzableElement get analyzedElement; Iterable<Node> get superUses; /// Iterables of the dependencies that this [TreeElement] records of /// [analyzedElement]. Iterable<Element> get allElements; void forEachConstantNode(f(Node n, ConstantExpression c)); /// A set of additional dependencies. See [registerDependency] below. Iterable<Element> get otherDependencies; Element operator[](Node node); // TODO(johnniwinther): Investigate whether [Node] could be a [Send]. Selector getSelector(Node node); Selector getGetterSelectorInComplexSendSet(SendSet node); Selector getOperatorSelectorInComplexSendSet(SendSet node); DartType getType(Node node); void setSelector(Node node, Selector selector); void setGetterSelectorInComplexSendSet(SendSet node, Selector selector); void setOperatorSelectorInComplexSendSet(SendSet node, Selector selector); /// Returns the for-in loop variable for [node]. Element getForInVariable(ForIn node); Selector getIteratorSelector(ForIn node); Selector getMoveNextSelector(ForIn node); Selector getCurrentSelector(ForIn node); void setIteratorSelector(ForIn node, Selector selector); void setMoveNextSelector(ForIn node, Selector selector); void setCurrentSelector(ForIn node, Selector selector); void setConstant(Node node, ConstantExpression constant); ConstantExpression getConstant(Node node); bool isAssert(Send send); /// Returns the [FunctionElement] defined by [node]. FunctionElement getFunctionDefinition(FunctionExpression node); /// Returns target constructor for the redirecting factory body [node]. ConstructorElement getRedirectingTargetConstructor( RedirectingFactoryBody node); /** * Returns [:true:] if [node] is a type literal. * * Resolution marks this by setting the type on the node to be the * type that the literal refers to. */ bool isTypeLiteral(Send node); /// Returns the type that the type literal [node] refers to. DartType getTypeLiteralType(Send node); /// Register additional dependencies required by [analyzedElement]. /// For example, elements that are used by a backend. void registerDependency(Element element); /// Returns a list of nodes that potentially mutate [element] anywhere in its /// scope. List<Node> getPotentialMutations(VariableElement element); /// Returns a list of nodes that potentially mutate [element] in [node]. List<Node> getPotentialMutationsIn(Node node, VariableElement element); /// Returns a list of nodes that potentially mutate [element] in a closure. List<Node> getPotentialMutationsInClosure(VariableElement element); /// Returns a list of nodes that access [element] within a closure in [node]. List<Node> getAccessesByClosureIn(Node node, VariableElement element); /// Returns the jump target defined by [node]. JumpTarget getTargetDefinition(Node node); /// Returns the jump target of the [node]. JumpTarget getTargetOf(GotoStatement node); /// Returns the label defined by [node]. LabelDefinition getLabelDefinition(Label node); /// Returns the label that [node] targets. LabelDefinition getTargetLabel(GotoStatement node); } class TreeElementMapping implements TreeElements { final AnalyzableElement analyzedElement; Map<Spannable, Selector> _selectors; Map<Node, DartType> _types; Setlet<Node> _superUses; Setlet<Element> _otherDependencies; Map<Node, ConstantExpression> _constants; Map<VariableElement, List<Node>> _potentiallyMutated; Map<Node, Map<VariableElement, List<Node>>> _potentiallyMutatedIn; Map<VariableElement, List<Node>> _potentiallyMutatedInClosure; Map<Node, Map<VariableElement, List<Node>>> _accessedByClosureIn; Setlet<Element> _elements; Setlet<Send> _asserts; /// Map from nodes to the targets they define. Map<Node, JumpTarget> _definedTargets; /// Map from goto statements to their targets. Map<GotoStatement, JumpTarget> _usedTargets; /// Map from labels to their label definition. Map<Label, LabelDefinition> _definedLabels; /// Map from labeled goto statements to the labels they target. Map<GotoStatement, LabelDefinition> _targetLabels; final int hashCode = ++_hashCodeCounter; static int _hashCodeCounter = 0; TreeElementMapping(this.analyzedElement); operator []=(Node node, Element element) { // TODO(johnniwinther): Simplify this invariant to use only declarations in // [TreeElements]. assert(invariant(node, () { if (!element.isErroneous && analyzedElement != null && element.isPatch) { return analyzedElement.implementationLibrary.isPatch; } return true; })); // TODO(ahe): Investigate why the invariant below doesn't hold. // assert(invariant(node, // getTreeElement(node) == element || // getTreeElement(node) == null, // message: '${getTreeElement(node)}; $element')); if (_elements == null) { _elements = new Setlet<Element>(); } _elements.add(element); setTreeElement(node, element); } operator [](Node node) => getTreeElement(node); void setType(Node node, DartType type) { if (_types == null) { _types = new Maplet<Node, DartType>(); } _types[node] = type; } DartType getType(Node node) => _types != null ? _types[node] : null; Iterable<Node> get superUses { return _superUses != null ? _superUses : const <Node>[]; } void addSuperUse(Node node) { if (_superUses == null) { _superUses = new Setlet<Node>(); } _superUses.add(node); } Selector _getSelector(Spannable node) { return _selectors != null ? _selectors[node] : null; } void _setSelector(Spannable node, Selector selector) { if (_selectors == null) { _selectors = new Maplet<Spannable, Selector>(); } _selectors[node] = selector; } void setSelector(Node node, Selector selector) { _setSelector(node, selector); } Selector getSelector(Node node) => _getSelector(node); int getSelectorCount() => _selectors == null ? 0 : _selectors.length; void setGetterSelectorInComplexSendSet(SendSet node, Selector selector) { _setSelector(node.selector, selector); } Selector getGetterSelectorInComplexSendSet(SendSet node) { return _getSelector(node.selector); } void setOperatorSelectorInComplexSendSet(SendSet node, Selector selector) { _setSelector(node.assignmentOperator, selector); } Selector getOperatorSelectorInComplexSendSet(SendSet node) { return _getSelector(node.assignmentOperator); } // The following methods set selectors on the "for in" node. Since // we're using three selectors, we need to use children of the node, // and we arbitrarily choose which ones. void setIteratorSelector(ForIn node, Selector selector) { _setSelector(node, selector); } Selector getIteratorSelector(ForIn node) { return _getSelector(node); } void setMoveNextSelector(ForIn node, Selector selector) { _setSelector(node.forToken, selector); } Selector getMoveNextSelector(ForIn node) { return _getSelector(node.forToken); } void setCurrentSelector(ForIn node, Selector selector) { _setSelector(node.inToken, selector); } Selector getCurrentSelector(ForIn node) { return _getSelector(node.inToken); } Element getForInVariable(ForIn node) { return this[node]; } void setConstant(Node node, ConstantExpression constant) { if (_constants == null) { _constants = new Maplet<Node, ConstantExpression>(); } _constants[node] = constant; } ConstantExpression getConstant(Node node) { return _constants != null ? _constants[node] : null; } bool isTypeLiteral(Send node) { return getType(node) != null; } DartType getTypeLiteralType(Send node) { return getType(node); } void registerDependency(Element element) { if (element == null) return; if (_otherDependencies == null) { _otherDependencies = new Setlet<Element>(); } _otherDependencies.add(element.implementation); } Iterable<Element> get otherDependencies { return _otherDependencies != null ? _otherDependencies : const <Element>[]; } List<Node> getPotentialMutations(VariableElement element) { if (_potentiallyMutated == null) return const <Node>[]; List<Node> mutations = _potentiallyMutated[element]; if (mutations == null) return const <Node>[]; return mutations; } void registerPotentialMutation(VariableElement element, Node mutationNode) { if (_potentiallyMutated == null) { _potentiallyMutated = new Maplet<VariableElement, List<Node>>(); } _potentiallyMutated.putIfAbsent(element, () => <Node>[]).add(mutationNode); } List<Node> getPotentialMutationsIn(Node node, VariableElement element) { if (_potentiallyMutatedIn == null) return const <Node>[]; Map<VariableElement, List<Node>> mutationsIn = _potentiallyMutatedIn[node]; if (mutationsIn == null) return const <Node>[]; List<Node> mutations = mutationsIn[element]; if (mutations == null) return const <Node>[]; return mutations; } void registerPotentialMutationIn(Node contextNode, VariableElement element, Node mutationNode) { if (_potentiallyMutatedIn == null) { _potentiallyMutatedIn = new Maplet<Node, Map<VariableElement, List<Node>>>(); } Map<VariableElement, List<Node>> mutationMap = _potentiallyMutatedIn.putIfAbsent(contextNode, () => new Maplet<VariableElement, List<Node>>()); mutationMap.putIfAbsent(element, () => <Node>[]).add(mutationNode); } List<Node> getPotentialMutationsInClosure(VariableElement element) { if (_potentiallyMutatedInClosure == null) return const <Node>[]; List<Node> mutations = _potentiallyMutatedInClosure[element]; if (mutations == null) return const <Node>[]; return mutations; } void registerPotentialMutationInClosure(VariableElement element, Node mutationNode) { if (_potentiallyMutatedInClosure == null) { _potentiallyMutatedInClosure = new Maplet<VariableElement, List<Node>>(); } _potentiallyMutatedInClosure.putIfAbsent( element, () => <Node>[]).add(mutationNode); } List<Node> getAccessesByClosureIn(Node node, VariableElement element) { if (_accessedByClosureIn == null) return const <Node>[]; Map<VariableElement, List<Node>> accessesIn = _accessedByClosureIn[node]; if (accessesIn == null) return const <Node>[]; List<Node> accesses = accessesIn[element]; if (accesses == null) return const <Node>[]; return accesses; } void setAccessedByClosureIn(Node contextNode, VariableElement element, Node accessNode) { if (_accessedByClosureIn == null) { _accessedByClosureIn = new Map<Node, Map<VariableElement, List<Node>>>(); } Map<VariableElement, List<Node>> accessMap = _accessedByClosureIn.putIfAbsent(contextNode, () => new Maplet<VariableElement, List<Node>>()); accessMap.putIfAbsent(element, () => <Node>[]).add(accessNode); } String toString() => 'TreeElementMapping($analyzedElement)'; Iterable<Element> get allElements { return _elements != null ? _elements : const <Element>[]; } void forEachConstantNode(f(Node n, ConstantExpression c)) { if (_constants != null) { _constants.forEach(f); } } void setAssert(Send node) { if (_asserts == null) { _asserts = new Setlet<Send>(); } _asserts.add(node); } bool isAssert(Send node) { return _asserts != null && _asserts.contains(node); } FunctionElement getFunctionDefinition(FunctionExpression node) { return this[node]; } ConstructorElement getRedirectingTargetConstructor( RedirectingFactoryBody node) { return this[node]; } void defineTarget(Node node, JumpTarget target) { if (_definedTargets == null) { _definedTargets = new Maplet<Node, JumpTarget>(); } _definedTargets[node] = target; } void undefineTarget(Node node) { if (_definedTargets != null) { _definedTargets.remove(node); if (_definedTargets.isEmpty) { _definedTargets = null; } } } JumpTarget getTargetDefinition(Node node) { return _definedTargets != null ? _definedTargets[node] : null; } void registerTargetOf(GotoStatement node, JumpTarget target) { if (_usedTargets == null) { _usedTargets = new Maplet<GotoStatement, JumpTarget>(); } _usedTargets[node] = target; } JumpTarget getTargetOf(GotoStatement node) { return _usedTargets != null ? _usedTargets[node] : null; } void defineLabel(Label label, LabelDefinition target) { if (_definedLabels == null) { _definedLabels = new Maplet<Label, LabelDefinition>(); } _definedLabels[label] = target; } void undefineLabel(Label label) { if (_definedLabels != null) { _definedLabels.remove(label); if (_definedLabels.isEmpty) { _definedLabels = null; } } } LabelDefinition getLabelDefinition(Label label) { return _definedLabels != null ? _definedLabels[label] : null; } void registerTargetLabel(GotoStatement node, LabelDefinition label) { assert(node.target != null); if (_targetLabels == null) { _targetLabels = new Maplet<GotoStatement, LabelDefinition>(); } _targetLabels[node] = label; } LabelDefinition getTargetLabel(GotoStatement node) { assert(node.target != null); return _targetLabels != null ? _targetLabels[node] : null; } } class ResolverTask extends CompilerTask { final ConstantCompiler constantCompiler; ResolverTask(Compiler compiler, this.constantCompiler) : super(compiler); String get name => 'Resolver'; TreeElements resolve(Element element) { return measure(() { if (Elements.isErroneous(element)) return null; processMetadata([result]) { for (MetadataAnnotation metadata in element.metadata) { metadata.ensureResolved(compiler); } return result; } ElementKind kind = element.kind; if (identical(kind, ElementKind.GENERATIVE_CONSTRUCTOR) || identical(kind, ElementKind.FUNCTION) || identical(kind, ElementKind.GETTER) || identical(kind, ElementKind.SETTER)) { return processMetadata(resolveMethodElement(element)); } if (identical(kind, ElementKind.FIELD)) { return processMetadata(resolveField(element)); } if (element.isClass) { ClassElement cls = element; cls.ensureResolved(compiler); return processMetadata(); } else if (element.isTypedef) { TypedefElement typdef = element; return processMetadata(resolveTypedef(typdef)); } compiler.unimplemented(element, "resolve($element)"); }); } void resolveRedirectingConstructor(InitializerResolver resolver, Node node, FunctionElement constructor, FunctionElement redirection) { assert(invariant(node, constructor.isImplementation, message: 'Redirecting constructors must be resolved on implementation ' 'elements.')); Setlet<FunctionElement> seen = new Setlet<FunctionElement>(); seen.add(constructor); while (redirection != null) { // Ensure that we follow redirections through implementation elements. redirection = redirection.implementation; if (seen.contains(redirection)) { resolver.visitor.error(node, MessageKind.REDIRECTING_CONSTRUCTOR_CYCLE); return; } seen.add(redirection); redirection = resolver.visitor.resolveConstructorRedirection(redirection); } } static void processAsyncMarker(Compiler compiler, BaseFunctionElementX element, Registry registry) { FunctionExpression functionExpression = element.node; AsyncModifier asyncModifier = functionExpression.asyncModifier; if (asyncModifier != null) { if (asyncModifier.isAsynchronous) { element.asyncMarker = asyncModifier.isYielding ? AsyncMarker.ASYNC_STAR : AsyncMarker.ASYNC; } else { element.asyncMarker = AsyncMarker.SYNC_STAR; } if (element.isAbstract) { compiler.reportError(asyncModifier, MessageKind.ASYNC_MODIFIER_ON_ABSTRACT_METHOD, {'modifier': element.asyncMarker}); } else if (element.isConstructor) { compiler.reportError(asyncModifier, MessageKind.ASYNC_MODIFIER_ON_CONSTRUCTOR, {'modifier': element.asyncMarker}); } else { if (element.isSetter) { compiler.reportError(asyncModifier, MessageKind.ASYNC_MODIFIER_ON_SETTER, {'modifier': element.asyncMarker}); } if (functionExpression.body.asReturn() != null && element.asyncMarker.isYielding) { compiler.reportError(asyncModifier, MessageKind.YIELDING_MODIFIER_ON_ARROW_BODY, {'modifier': element.asyncMarker}); } } registry.registerAsyncMarker(element); switch (element.asyncMarker) { case AsyncMarker.ASYNC: compiler.futureClass.ensureResolved(compiler); break; case AsyncMarker.ASYNC_STAR: compiler.streamClass.ensureResolved(compiler); break; case AsyncMarker.SYNC_STAR: compiler.iterableClass.ensureResolved(compiler); break; } } } bool _isNativeClassOrExtendsNativeClass(ClassElement classElement) { assert(classElement != null); while (classElement != null) { if (classElement.isNative) return true; classElement = classElement.superclass; } return false; } TreeElements resolveMethodElementImplementation( FunctionElement element, FunctionExpression tree) { return compiler.withCurrentElement(element, () { if (element.isExternal && tree.hasBody()) { error(element, MessageKind.EXTERNAL_WITH_BODY, {'functionName': element.name}); } if (element.isConstructor) { if (tree.returnType != null) { error(tree, MessageKind.CONSTRUCTOR_WITH_RETURN_TYPE); } if (element.isConst && tree.hasBody() && !tree.isRedirectingFactory) { error(tree, MessageKind.CONST_CONSTRUCTOR_HAS_BODY); } } ResolverVisitor visitor = visitorFor(element); ResolutionRegistry registry = visitor.registry; registry.defineFunction(tree, element); visitor.setupFunction(tree, element); processAsyncMarker(compiler, element, registry); if (element.isGenerativeConstructor) { // Even if there is no initializer list we still have to do the // resolution in case there is an implicit super constructor call. InitializerResolver resolver = new InitializerResolver(visitor); FunctionElement redirection = resolver.resolveInitializers(element, tree); if (redirection != null) { resolveRedirectingConstructor(resolver, tree, element, redirection); } } else if (tree.initializers != null) { error(tree, MessageKind.FUNCTION_WITH_INITIALIZER); } if (!compiler.analyzeSignaturesOnly || tree.isRedirectingFactory) { // We need to analyze the redirecting factory bodies to ensure that // we can analyze compile-time constants. visitor.visit(tree.body); } // Get the resolution tree and check that the resolved // function doesn't use 'super' if it is mixed into another // class. This is the part of the 'super' mixin check that // happens when a function is resolved after the mixin // application has been performed. TreeElements resolutionTree = registry.mapping; ClassElement enclosingClass = element.enclosingClass; if (enclosingClass != null) { // TODO(johnniwinther): Find another way to obtain mixin uses. Iterable<MixinApplicationElement> mixinUses = compiler.world.allMixinUsesOf(enclosingClass); ClassElement mixin = enclosingClass; for (MixinApplicationElement mixinApplication in mixinUses) { checkMixinSuperUses(resolutionTree, mixinApplication, mixin); } } // TODO(9631): support noSuchMethod on native classes. if (Elements.isInstanceMethod(element) && element.name == Compiler.NO_SUCH_METHOD && _isNativeClassOrExtendsNativeClass(enclosingClass)) { error(tree, MessageKind.NO_SUCH_METHOD_IN_NATIVE); } return resolutionTree; }); } TreeElements resolveMethodElement(FunctionElementX element) { assert(invariant(element, element.isDeclaration)); return compiler.withCurrentElement(element, () { if (compiler.enqueuer.resolution.hasBeenResolved(element)) { // TODO(karlklose): Remove the check for [isConstructor]. [elememts] // should never be non-null, not even for constructors. assert(invariant(element, element.isConstructor, message: 'Non-constructor element $element ' 'has already been analyzed.')); return element.resolvedAst.elements; } if (element.isSynthesized) { if (element.isGenerativeConstructor) { ResolutionRegistry registry = new ResolutionRegistry(compiler, element); ConstructorElement constructor = element.asFunctionElement(); ConstructorElement target = constructor.definingConstructor; // Ensure the signature of the synthesized element is // resolved. This is the only place where the resolver is // seeing this element. element.computeSignature(compiler); if (!target.isErroneous) { registry.registerStaticUse(target); registry.registerImplicitSuperCall(target); } return registry.mapping; } else { assert(element.isDeferredLoaderGetter || element.isErroneous); return _ensureTreeElements(element); } } else { element.parseNode(compiler); element.computeType(compiler); FunctionElementX implementation = element; if (element.isExternal) { implementation = compiler.backend.resolveExternalFunction(element); } return resolveMethodElementImplementation( implementation, implementation.node); } }); } /// Creates a [ResolverVisitor] for resolving an AST in context of [element]. /// If [useEnclosingScope] is `true` then the initial scope of the visitor /// does not include inner scope of [element]. /// /// This method should only be used by this library (or tests of /// this library). ResolverVisitor visitorFor(Element element, {bool useEnclosingScope: false}) { return new ResolverVisitor(compiler, element, new ResolutionRegistry(compiler, element), useEnclosingScope: useEnclosingScope); } TreeElements resolveField(FieldElementX element) { VariableDefinitions tree = element.parseNode(compiler); if(element.modifiers.isStatic && element.isTopLevel) { error(element.modifiers.getStatic(), MessageKind.TOP_LEVEL_VARIABLE_DECLARED_STATIC); } ResolverVisitor visitor = visitorFor(element); ResolutionRegistry registry = visitor.registry; // TODO(johnniwinther): Maybe remove this when placeholderCollector migrates // to the backend ast. registry.defineElement(tree.definitions.nodes.head, element); // TODO(johnniwinther): Share the resolved type between all variables // declared in the same declaration. if (tree.type != null) { element.variables.type = visitor.resolveTypeAnnotation(tree.type); } else { element.variables.type = const DynamicType(); } Expression initializer = element.initializer; Modifiers modifiers = element.modifiers; if (initializer != null) { // TODO(johnniwinther): Avoid analyzing initializers if // [Compiler.analyzeSignaturesOnly] is set. visitor.visit(initializer); } else if (modifiers.isConst) { compiler.reportError(element, MessageKind.CONST_WITHOUT_INITIALIZER); } else if (modifiers.isFinal && !element.isInstanceMember) { compiler.reportError(element, MessageKind.FINAL_WITHOUT_INITIALIZER); } else { registry.registerInstantiatedClass(compiler.nullClass); } if (Elements.isStaticOrTopLevelField(element)) { visitor.addDeferredAction(element, () { if (element.modifiers.isConst) { constantCompiler.compileConstant(element); } else { constantCompiler.compileVariable(element); } }); if (initializer != null) { if (!element.modifiers.isConst) { // TODO(johnniwinther): Determine the const-ness eagerly to avoid // unnecessary registrations. registry.registerLazyField(); } } } // Perform various checks as side effect of "computing" the type. element.computeType(compiler); return registry.mapping; } DartType resolveTypeAnnotation(Element element, TypeAnnotation annotation) { DartType type = resolveReturnType(element, annotation); if (type.isVoid) { error(annotation, MessageKind.VOID_NOT_ALLOWED); } return type; } DartType resolveReturnType(Element element, TypeAnnotation annotation) { if (annotation == null) return const DynamicType(); DartType result = visitorFor(element).resolveTypeAnnotation(annotation); if (result == null) { // TODO(karklose): warning. return const DynamicType(); } return result; } void resolveRedirectionChain(ConstructorElementX constructor, Spannable node) { ConstructorElementX target = constructor; InterfaceType targetType; List<Element> seen = new List<Element>(); // Follow the chain of redirections and check for cycles. while (target.isRedirectingFactory) { if (target.internalEffectiveTarget != null) { // We found a constructor that already has been processed. targetType = target.effectiveTargetType; assert(invariant(target, targetType != null, message: 'Redirection target type has not been computed for ' '$target')); target = target.internalEffectiveTarget; break; } Element nextTarget = target.immediateRedirectionTarget; if (seen.contains(nextTarget)) { error(node, MessageKind.CYCLIC_REDIRECTING_FACTORY); targetType = target.enclosingClass.thisType; break; } seen.add(target); target = nextTarget; } if (targetType == null) { assert(!target.isRedirectingFactory); targetType = target.enclosingClass.thisType; } // [target] is now the actual target of the redirections. Run through // the constructors again and set their [redirectionTarget], so that we // do not have to run the loop for these constructors again. Furthermore, // compute [redirectionTargetType] for each factory by computing the // substitution of the target type with respect to the factory type. while (!seen.isEmpty) { ConstructorElementX factory = seen.removeLast(); // [factory] must already be analyzed but the [TreeElements] might not // have been stored in the enqueuer cache yet. // TODO(johnniwinther): Store [TreeElements] in the cache before // resolution of the element. TreeElements treeElements = factory.treeElements; assert(invariant(node, treeElements != null, message: 'No TreeElements cached for $factory.')); FunctionExpression functionNode = factory.parseNode(compiler); RedirectingFactoryBody redirectionNode = functionNode.body; DartType factoryType = treeElements.getType(redirectionNode); if (!factoryType.isDynamic) { targetType = targetType.substByContext(factoryType); } factory.effectiveTarget = target; factory.effectiveTargetType = targetType; } } /** * Load and resolve the supertypes of [cls]. * * Warning: do not call this method directly. It should only be * called by [resolveClass] and [ClassSupertypeResolver]. */ void loadSupertypes(BaseClassElementX cls, Spannable from) { compiler.withCurrentElement(cls, () => measure(() { if (cls.supertypeLoadState == STATE_DONE) return; if (cls.supertypeLoadState == STATE_STARTED) { compiler.reportError(from, MessageKind.CYCLIC_CLASS_HIERARCHY, {'className': cls.name}); cls.supertypeLoadState = STATE_DONE; cls.hasIncompleteHierarchy = true; cls.allSupertypesAndSelf = compiler.objectClass.allSupertypesAndSelf.extendClass( cls.computeType(compiler)); cls.supertype = cls.allSupertypes.head; assert(invariant(from, cls.supertype != null, message: 'Missing supertype on cyclic class $cls.')); cls.interfaces = const Link<DartType>(); return; } cls.supertypeLoadState = STATE_STARTED; compiler.withCurrentElement(cls, () { // TODO(ahe): Cache the node in cls. cls.parseNode(compiler).accept( new ClassSupertypeResolver(compiler, cls)); if (cls.supertypeLoadState != STATE_DONE) { cls.supertypeLoadState = STATE_DONE; } }); })); } // TODO(johnniwinther): Remove this queue when resolution has been split into // syntax and semantic resolution. TypeDeclarationElement currentlyResolvedTypeDeclaration; Queue<ClassElement> pendingClassesToBeResolved = new Queue<ClassElement>(); Queue<ClassElement> pendingClassesToBePostProcessed = new Queue<ClassElement>(); /// Resolve [element] using [resolveTypeDeclaration]. /// /// This methods ensure that class declarations encountered through type /// annotations during the resolution of [element] are resolved after /// [element] has been resolved. // TODO(johnniwinther): Encapsulate this functionality in a // 'TypeDeclarationResolver'. _resolveTypeDeclaration(TypeDeclarationElement element, resolveTypeDeclaration()) { return compiler.withCurrentElement(element, () { return measure(() { TypeDeclarationElement previousResolvedTypeDeclaration = currentlyResolvedTypeDeclaration; currentlyResolvedTypeDeclaration = element; var result = resolveTypeDeclaration(); if (previousResolvedTypeDeclaration == null) { do { while (!pendingClassesToBeResolved.isEmpty) { pendingClassesToBeResolved.removeFirst().ensureResolved(compiler); } while (!pendingClassesToBePostProcessed.isEmpty) { _postProcessClassElement( pendingClassesToBePostProcessed.removeFirst()); } } while (!pendingClassesToBeResolved.isEmpty); assert(pendingClassesToBeResolved.isEmpty); assert(pendingClassesToBePostProcessed.isEmpty); } currentlyResolvedTypeDeclaration = previousResolvedTypeDeclaration; return result; }); }); } /** * Resolve the class [element]. * * Before calling this method, [element] was constructed by the * scanner and most fields are null or empty. This method fills in * these fields and also ensure that the supertypes of [element] are * resolved. * * Warning: Do not call this method directly. Instead use * [:element.ensureResolved(compiler):]. */ TreeElements resolveClass(BaseClassElementX element) { return _resolveTypeDeclaration(element, () { // TODO(johnniwinther): Store the mapping in the resolution enqueuer. ResolutionRegistry registry = new ResolutionRegistry(compiler, element); resolveClassInternal(element, registry); return element.treeElements; }); } void _ensureClassWillBeResolved(ClassElement element) { if (currentlyResolvedTypeDeclaration == null) { element.ensureResolved(compiler); } else { pendingClassesToBeResolved.add(element); } } void resolveClassInternal(BaseClassElementX element, ResolutionRegistry registry) { if (!element.isPatch) { compiler.withCurrentElement(element, () => measure(() { assert(element.resolutionState == STATE_NOT_STARTED); element.resolutionState = STATE_STARTED; Node tree = element.parseNode(compiler); loadSupertypes(element, tree); ClassResolverVisitor visitor = new ClassResolverVisitor(compiler, element, registry); visitor.visit(tree); element.resolutionState = STATE_DONE; compiler.onClassResolved(element); pendingClassesToBePostProcessed.add(element); })); if (element.isPatched) { // Ensure handling patch after origin. element.patch.ensureResolved(compiler); } } else { // Handle patch classes: element.resolutionState = STATE_STARTED; // Ensure handling origin before patch. element.origin.ensureResolved(compiler); // Ensure that the type is computed. element.computeType(compiler); // Copy class hierarchy from origin. element.supertype = element.origin.supertype; element.interfaces = element.origin.interfaces; element.allSupertypesAndSelf = element.origin.allSupertypesAndSelf; // Stepwise assignment to ensure invariant. element.supertypeLoadState = STATE_STARTED; element.supertypeLoadState = STATE_DONE; element.resolutionState = STATE_DONE; // TODO(johnniwinther): Check matching type variables and // empty extends/implements clauses. } } void _postProcessClassElement(BaseClassElementX element) { for (MetadataAnnotation metadata in element.metadata) { metadata.ensureResolved(compiler); if (!element.isProxy && metadata.constant.value == compiler.proxyConstant) { element.isProxy = true; } } // Force resolution of metadata on non-instance members since they may be // inspected by the backend while emitting. Metadata on instance members is // handled as a result of processing instantiated class members in the // enqueuer. // TODO(ahe): Avoid this eager resolution. element.forEachMember((_, Element member) { if (!member.isInstanceMember) { compiler.withCurrentElement(member, () { for (MetadataAnnotation metadata in member.metadata) { metadata.ensureResolved(compiler); } }); } }); computeClassMember(element, Compiler.CALL_OPERATOR_NAME); } void computeClassMembers(ClassElement element) { MembersCreator.computeAllClassMembers(compiler, element); } void computeClassMember(ClassElement element, String name) { MembersCreator.computeClassMembersByName(compiler, element, name); } void checkClass(ClassElement element) { computeClassMembers(element); if (element.isMixinApplication) { checkMixinApplication(element); } else { checkClassMembers(element); } } void checkMixinApplication(MixinApplicationElementX mixinApplication) { Modifiers modifiers = mixinApplication.modifiers; int illegalFlags = modifiers.flags & ~Modifiers.FLAG_ABSTRACT; if (illegalFlags != 0) { Modifiers illegalModifiers = new Modifiers.withFlags(null, illegalFlags); compiler.reportError( modifiers, MessageKind.ILLEGAL_MIXIN_APPLICATION_MODIFIERS, {'modifiers': illegalModifiers}); } // In case of cyclic mixin applications, the mixin chain will have // been cut. If so, we have already reported the error to the // user so we just return from here. ClassElement mixin = mixinApplication.mixin; if (mixin == null) return; // Check that we're not trying to use Object as a mixin. if (mixin.superclass == null) { compiler.reportError(mixinApplication, MessageKind.ILLEGAL_MIXIN_OBJECT); // Avoid reporting additional errors for the Object class. return; } if (mixin.isEnumClass) { // Mixing in an enum has already caused a compile-time error. return; } // Check that the mixed in class has Object as its superclass. if (!mixin.superclass.isObject) { compiler.reportError(mixin, MessageKind.ILLEGAL_MIXIN_SUPERCLASS); } // Check that the mixed in class doesn't have any constructors and // make sure we aren't mixing in methods that use 'super'. mixin.forEachLocalMember((AstElement member) { if (member.isGenerativeConstructor && !member.isSynthesized) { compiler.reportError(member, MessageKind.ILLEGAL_MIXIN_CONSTRUCTOR); } else { // Get the resolution tree and check that the resolved member // doesn't use 'super'. This is the part of the 'super' mixin // check that happens when a function is resolved before the // mixin application has been performed. // TODO(johnniwinther): Obtain the [TreeElements] for [member] // differently. if (compiler.enqueuer.resolution.hasBeenResolved(member)) { checkMixinSuperUses( member.resolvedAst.elements, mixinApplication, mixin); } } }); } void checkMixinSuperUses(TreeElements resolutionTree, MixinApplicationElement mixinApplication, ClassElement mixin) { // TODO(johnniwinther): Avoid the use of [TreeElements] here. if (resolutionTree == null) return; Iterable<Node> superUses = resolutionTree.superUses; if (superUses.isEmpty) return; compiler.reportError(mixinApplication, MessageKind.ILLEGAL_MIXIN_WITH_SUPER, {'className': mixin.name}); // Show the user the problematic uses of 'super' in the mixin. for (Node use in superUses) { compiler.reportInfo( use, MessageKind.ILLEGAL_MIXIN_SUPER_USE); } } void checkClassMembers(ClassElement cls) { assert(invariant(cls, cls.isDeclaration)); if (cls.isObject) return; // TODO(johnniwinther): Should this be done on the implementation element as // well? List<Element> constConstructors = <Element>[]; List<Element> nonFinalInstanceFields = <Element>[]; cls.forEachMember((holder, member) { compiler.withCurrentElement(member, () { // Perform various checks as side effect of "computing" the type. member.computeType(compiler); // Check modifiers. if (member.isFunction && member.modifiers.isFinal) { compiler.reportError( member, MessageKind.ILLEGAL_FINAL_METHOD_MODIFIER); } if (member.isConstructor) { final mismatchedFlagsBits = member.modifiers.flags & (Modifiers.FLAG_STATIC | Modifiers.FLAG_ABSTRACT); if (mismatchedFlagsBits != 0) { final mismatchedFlags = new Modifiers.withFlags(null, mismatchedFlagsBits); compiler.reportError( member, MessageKind.ILLEGAL_CONSTRUCTOR_MODIFIERS, {'modifiers': mismatchedFlags}); } if (member.modifiers.isConst) { constConstructors.add(member); } } if (member.isField) { if (member.modifiers.isConst && !member.modifiers.isStatic) { compiler.reportError( member, MessageKind.ILLEGAL_CONST_FIELD_MODIFIER); } if (!member.modifiers.isStatic && !member.modifiers.isFinal) { nonFinalInstanceFields.add(member); } } checkAbstractField(member); checkUserDefinableOperator(member); }); }); if (!constConstructors.isEmpty && !nonFinalInstanceFields.isEmpty) { Spannable span = constConstructors.length > 1 ? cls : constConstructors[0]; compiler.reportError(span, MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS, {'className': cls.name}); if (constConstructors.length > 1) { for (Element constructor in constConstructors) { compiler.reportInfo(constructor, MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR); } } for (Element field in nonFinalInstanceFields) { compiler.reportInfo(field, MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD); } } } void checkAbstractField(Element member) { // Only check for getters. The test can only fail if there is both a setter // and a getter with the same name, and we only need to check each abstract // field once, so we just ignore setters. if (!member.isGetter) return; // Find the associated abstract field. ClassElement classElement = member.enclosingClass; Element lookupElement = classElement.lookupLocalMember(member.name); if (lookupElement == null) { compiler.internalError(member, "No abstract field for accessor"); } else if (!identical(lookupElement.kind, ElementKind.ABSTRACT_FIELD)) { if (lookupElement.isErroneous || lookupElement.isAmbiguous) return; compiler.internalError(member, "Inaccessible abstract field for accessor"); } AbstractFieldElement field = lookupElement; FunctionElementX getter = field.getter; if (getter == null) return; FunctionElementX setter = field.setter; if (setter == null) return; int getterFlags = getter.modifiers.flags | Modifiers.FLAG_ABSTRACT; int setterFlags = setter.modifiers.flags | Modifiers.FLAG_ABSTRACT; if (!identical(getterFlags, setterFlags)) { final mismatchedFlags = new Modifiers.withFlags(null, getterFlags ^ setterFlags); compiler.reportError( field.getter, MessageKind.GETTER_MISMATCH, {'modifiers': mismatchedFlags}); compiler.reportError( field.setter, MessageKind.SETTER_MISMATCH, {'modifiers': mismatchedFlags}); } } void checkUserDefinableOperator(Element member) { FunctionElement function = member.asFunctionElement(); if (function == null) return; String value = member.name; if (value == null) return; if (!(isUserDefinableOperator(value) || identical(value, 'unary-'))) return; bool isMinus = false; int requiredParameterCount; MessageKind messageKind; if (identical(value, 'unary-')) { isMinus = true; messageKind = MessageKind.MINUS_OPERATOR_BAD_ARITY; requiredParameterCount = 0; } else if (isMinusOperator(value)) { isMinus = true; messageKind = MessageKind.MINUS_OPERATOR_BAD_ARITY; requiredParameterCount = 1; } else if (isUnaryOperator(value)) { messageKind = MessageKind.UNARY_OPERATOR_BAD_ARITY; requiredParameterCount = 0; } else if (isBinaryOperator(value)) { messageKind = MessageKind.BINARY_OPERATOR_BAD_ARITY; requiredParameterCount = 1; if (identical(value, '==')) checkOverrideHashCode(member); } else if (isTernaryOperator(value)) { messageKind = MessageKind.TERNARY_OPERATOR_BAD_ARITY; requiredParameterCount = 2; } else { compiler.internalError(function, 'Unexpected user defined operator $value'); } checkArity(function, requiredParameterCount, messageKind, isMinus); } void checkOverrideHashCode(FunctionElement operatorEquals) { if (operatorEquals.isAbstract) return; ClassElement cls = operatorEquals.enclosingClass; Element hashCodeImplementation = cls.lookupLocalMember('hashCode'); if (hashCodeImplementation != null) return; compiler.reportHint( operatorEquals, MessageKind.OVERRIDE_EQUALS_NOT_HASH_CODE, {'class': cls.name}); } void checkArity(FunctionElement function, int requiredParameterCount, MessageKind messageKind, bool isMinus) { FunctionExpression node = function.node; FunctionSignature signature = function.functionSignature; if (signature.requiredParameterCount != requiredParameterCount) { Node errorNode = node; if (node.parameters != null) { if (isMinus || signature.requiredParameterCount < requiredParameterCount) { // If there are too few parameters, point to the whole parameter list. // For instance // // int operator +() {} // ^^ // // int operator []=(value) {} // ^^^^^^^ // // For operator -, always point the whole parameter list, like // // int operator -(a, b) {} // ^^^^^^ // // instead of // // int operator -(a, b) {} // ^ // // since the correction might not be to remove 'b' but instead to // remove 'a, b'. errorNode = node.parameters; } else { errorNode = node.parameters.nodes.skip(requiredParameterCount).head; } } compiler.reportError( errorNode, messageKind, {'operatorName': function.name}); } if (signature.optionalParameterCount != 0) { Node errorNode = node.parameters.nodes.skip(signature.requiredParameterCount).head; if (signature.optionalParametersAreNamed) { compiler.reportError( errorNode, MessageKind.OPERATOR_NAMED_PARAMETERS, {'operatorName': function.name}); } else { compiler.reportError( errorNode, MessageKind.OPERATOR_OPTIONAL_PARAMETERS, {'operatorName': function.name}); } } } reportErrorWithContext(Element errorneousElement, MessageKind errorMessage, Element contextElement, MessageKind contextMessage) { compiler.reportError( errorneousElement, errorMessage, {'memberName': contextElement.name, 'className': contextElement.enclosingClass.name}); compiler.reportInfo(contextElement, contextMessage); } FunctionSignature resolveSignature(FunctionElementX element) { MessageKind defaultValuesError = null; if (element.isFactoryConstructor) { FunctionExpression body = element.parseNode(compiler); if (body.isRedirectingFactory) { defaultValuesError = MessageKind.REDIRECTING_FACTORY_WITH_DEFAULT; } } return compiler.withCurrentElement(element, () { FunctionExpression node = compiler.parser.measure(() => element.parseNode(compiler)); return measure(() => SignatureResolver.analyze( compiler, node.parameters, node.returnType, element, new ResolutionRegistry(compiler, element), defaultValuesError: defaultValuesError, createRealParameters: true)); }); } TreeElements resolveTypedef(TypedefElementX element) { if (element.isResolved) return element.treeElements; compiler.world.allTypedefs.add(element); return _resolveTypeDeclaration(element, () { ResolutionRegistry registry = new ResolutionRegistry(compiler, element); return compiler.withCurrentElement(element, () { return measure(() { assert(element.resolutionState == STATE_NOT_STARTED); element.resolutionState = STATE_STARTED; Typedef node = compiler.parser.measure(() => element.parseNode(compiler)); TypedefResolverVisitor visitor = new TypedefResolverVisitor(compiler, element, registry); visitor.visit(node); element.resolutionState = STATE_DONE; return registry.mapping; }); }); }); } void resolveMetadataAnnotation(MetadataAnnotationX annotation) { compiler.withCurrentElement(annotation.annotatedElement, () => measure(() { assert(annotation.resolutionState == STATE_NOT_STARTED); annotation.resolutionState = STATE_STARTED; Node node = annotation.parseNode(compiler); Element annotatedElement = annotation.annotatedElement; AnalyzableElement context = annotatedElement.analyzableElement; ClassElement classElement = annotatedElement.enclosingClass; if (classElement != null) { // The annotation is resolved in the scope of [classElement]. classElement.ensureResolved(compiler); } assert(invariant(node, context != null, message: "No context found for metadata annotation " "on $annotatedElement.")); ResolverVisitor visitor = visitorFor(context, useEnclosingScope: true); ResolutionRegistry registry = visitor.registry; node.accept(visitor); // TODO(johnniwinther): Avoid passing the [TreeElements] to // [compileMetadata]. annotation.constant = constantCompiler.compileMetadata(annotation, node, registry.mapping); // TODO(johnniwinther): Register the relation between the annotation // and the annotated element instead. This will allow the backend to // retrieve the backend constant and only register metadata on the // elements for which it is needed. (Issue 17732). registry.registerMetadataConstant(annotation, annotatedElement); annotation.resolutionState = STATE_DONE; })); } error(Spannable node, MessageKind kind, [arguments = const {}]) { compiler.reportError(node, kind, arguments); } Link<MetadataAnnotation> resolveMetadata(Element element, VariableDefinitions node) { LinkBuilder<MetadataAnnotation> metadata = new LinkBuilder<MetadataAnnotation>(); for (Metadata annotation in node.metadata.nodes) { ParameterMetadataAnnotation metadataAnnotation = new ParameterMetadataAnnotation(annotation); metadataAnnotation.annotatedElement = element; metadata.addLast(metadataAnnotation.ensureResolved(compiler)); } return metadata.toLink(); } } class InitializerResolver { final ResolverVisitor visitor; final Map<Element, Node> initialized; Link<Node> initializers; bool hasSuper; InitializerResolver(this.visitor) : initialized = new Map<Element, Node>(), hasSuper = false; ResolutionRegistry get registry => visitor.registry; error(Node node, MessageKind kind, [arguments = const {}]) { visitor.error(node, kind, arguments); } warning(Node node, MessageKind kind, [arguments = const {}]) { visitor.warning(node, kind, arguments); } bool isFieldInitializer(SendSet node) { if (node.selector.asIdentifier() == null) return false; if (node.receiver == null) return true; if (node.receiver.asIdentifier() == null) return false; return node.receiver.asIdentifier().isThis(); } reportDuplicateInitializerError(Element field, Node init, Node existing) { visitor.compiler.reportError( init, MessageKind.DUPLICATE_INITIALIZER, {'fieldName': field.name}); visitor.compiler.reportInfo( existing, MessageKind.ALREADY_INITIALIZED, {'fieldName': field.name}); } void checkForDuplicateInitializers(FieldElementX field, Node init) { // [field] can be null if it could not be resolved. if (field == null) return; String name = field.name; if (initialized.containsKey(field)) { reportDuplicateInitializerError(field, init, initialized[field]); } else if (field.isFinal) { field.parseNode(visitor.compiler); Expression initializer = field.initializer; if (initializer != null) { reportDuplicateInitializerError(field, init, initializer); } } initialized[field] = init; } void resolveFieldInitializer(FunctionElement constructor, SendSet init) { // init is of the form [this.]field = value. final Node selector = init.selector; final String name = selector.asIdentifier().source; // Lookup target field. Element target; if (isFieldInitializer(init)) { target = constructor.enclosingClass.lookupLocalMember(name); if (target == null) { error(selector, MessageKind.CANNOT_RESOLVE, {'name': name}); target = new ErroneousFieldElementX( selector.asIdentifier(), constructor.enclosingClass); } else if (target.kind != ElementKind.FIELD) { error(selector, MessageKind.NOT_A_FIELD, {'fieldName': name}); target = new ErroneousFieldElementX( selector.asIdentifier(), constructor.enclosingClass); } else if (!target.isInstanceMember) { error(selector, MessageKind.INIT_STATIC_FIELD, {'fieldName': name}); } } else { error(init, MessageKind.INVALID_RECEIVER_IN_INITIALIZER); } registry.useElement(init, target); registry.registerStaticUse(target); checkForDuplicateInitializers(target, init); // Resolve initializing value. visitor.visitInStaticContext(init.arguments.head); } ClassElement getSuperOrThisLookupTarget(FunctionElement constructor, bool isSuperCall, Node diagnosticNode) { ClassElement lookupTarget = constructor.enclosingClass; if (isSuperCall) { // Calculate correct lookup target and constructor name. if (identical(lookupTarget, visitor.compiler.objectClass)) { error(diagnosticNode, MessageKind.SUPER_INITIALIZER_IN_OBJECT); } else { return lookupTarget.supertype.element; } } return lookupTarget; } Element resolveSuperOrThisForSend(FunctionElement constructor, FunctionExpression functionNode, Send call) { // Resolve the selector and the arguments. ResolverTask resolver = visitor.compiler.resolver; visitor.inStaticContext(() { visitor.resolveSelector(call, null); visitor.resolveArguments(call.argumentsNode); }); Selector selector = registry.getSelector(call); bool isSuperCall = Initializers.isSuperConstructorCall(call); ClassElement lookupTarget = getSuperOrThisLookupTarget(constructor, isSuperCall, call); Selector constructorSelector = visitor.getRedirectingThisOrSuperConstructorSelector(call); FunctionElement calledConstructor = lookupTarget.lookupConstructor(constructorSelector.name); final bool isImplicitSuperCall = false; final String className = lookupTarget.name; verifyThatConstructorMatchesCall(constructor, calledConstructor, selector.callStructure, isImplicitSuperCall, call, className, constructorSelector); registry.useElement(call, calledConstructor); registry.registerStaticUse(calledConstructor); return calledConstructor; } void resolveImplicitSuperConstructorSend(FunctionElement constructor, FunctionExpression functionNode) { // If the class has a super resolve the implicit super call. ClassElement classElement = constructor.enclosingClass; ClassElement superClass = classElement.superclass; if (classElement != visitor.compiler.objectClass) { assert(superClass != null); assert(superClass.resolutionState == STATE_DONE); final bool isSuperCall = true; ClassElement lookupTarget = getSuperOrThisLookupTarget(constructor, isSuperCall, functionNode); Selector constructorSelector = new Selector.callDefaultConstructor(); Element calledConstructor = lookupTarget.lookupConstructor( constructorSelector.name); final String className = lookupTarget.name; final bool isImplicitSuperCall = true; verifyThatConstructorMatchesCall(constructor, calledConstructor, CallStructure.NO_ARGS, isImplicitSuperCall, functionNode, className, constructorSelector); registry.registerImplicitSuperCall(calledConstructor); registry.registerStaticUse(calledConstructor); } } void verifyThatConstructorMatchesCall( FunctionElement caller, ConstructorElementX lookedupConstructor, CallStructure call, bool isImplicitSuperCall, Node diagnosticNode, String className, Selector constructorSelector) { if (lookedupConstructor == null || !lookedupConstructor.isGenerativeConstructor) { String fullConstructorName = Elements.constructorNameForDiagnostics( className, constructorSelector.name); MessageKind kind = isImplicitSuperCall ? MessageKind.CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT : MessageKind.CANNOT_RESOLVE_CONSTRUCTOR; visitor.compiler.reportError( diagnosticNode, kind, {'constructorName': fullConstructorName}); } else { lookedupConstructor.computeSignature(visitor.compiler); if (!call.signatureApplies(lookedupConstructor)) { MessageKind kind = isImplicitSuperCall ? MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT : MessageKind.NO_MATCHING_CONSTRUCTOR; visitor.compiler.reportError(diagnosticNode, kind); } else if (caller.isConst && !lookedupConstructor.isConst) { visitor.compiler.reportError( diagnosticNode, MessageKind.CONST_CALLS_NON_CONST); } } } /** * Resolve all initializers of this constructor. In the case of a redirecting * constructor, the resolved constructor's function element is returned. */ ConstructorElement resolveInitializers(ConstructorElementX constructor, FunctionExpression functionNode) { // Keep track of all "this.param" parameters specified for constructor so // that we can ensure that fields are initialized only once. FunctionSignature functionParameters = constructor.functionSignature; functionParameters.forEachParameter((ParameterElement element) { if (element.isInitializingFormal) { InitializingFormalElement initializingFormal = element; checkForDuplicateInitializers(initializingFormal.fieldElement, element.initializer); } }); if (functionNode.initializers == null) { initializers = const Link<Node>(); } else { initializers = functionNode.initializers.nodes; } FunctionElement result; bool resolvedSuper = false; for (Link<Node> link = initializers; !link.isEmpty; link = link.tail) { if (link.head.asSendSet() != null) { final SendSet init = link.head.asSendSet(); resolveFieldInitializer(constructor, init); } else if (link.head.asSend() != null) { final Send call = link.head.asSend(); if (call.argumentsNode == null) { error(link.head, MessageKind.INVALID_INITIALIZER); continue; } if (Initializers.isSuperConstructorCall(call)) { if (resolvedSuper) { error(call, MessageKind.DUPLICATE_SUPER_INITIALIZER); } resolveSuperOrThisForSend(constructor, functionNode, call); resolvedSuper = true; } else if (Initializers.isConstructorRedirect(call)) { // Check that there is no body (Language specification 7.5.1). If the // constructor is also const, we already reported an error in // [resolveMethodElement]. if (functionNode.hasBody() && !constructor.isConst) { error(functionNode, MessageKind.REDIRECTING_CONSTRUCTOR_HAS_BODY); } // Check that there are no other initializers. if (!initializers.tail.isEmpty) { error(call, MessageKind.REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER); } else { constructor.isRedirectingGenerative = true; } // Check that there are no field initializing parameters. Compiler compiler = visitor.compiler; FunctionSignature signature = constructor.functionSignature; signature.forEachParameter((ParameterElement parameter) { if (parameter.isInitializingFormal) { Node node = parameter.node; error(node, MessageKind.INITIALIZING_FORMAL_NOT_ALLOWED); } }); return resolveSuperOrThisForSend(constructor, functionNode, call); } else { visitor.error(call, MessageKind.CONSTRUCTOR_CALL_EXPECTED); return null; } } else { error(link.head, MessageKind.INVALID_INITIALIZER); } } if (!resolvedSuper) { resolveImplicitSuperConstructorSend(constructor, functionNode); } return null; // If there was no redirection always return null. } } class CommonResolverVisitor<R> extends Visitor<R> { final Compiler compiler; CommonResolverVisitor(Compiler this.compiler); R visitNode(Node node) { internalError(node, 'internal error: Unhandled node: ${node.getObjectDescription()}'); return null; } R visitEmptyStatement(Node node) => null; /** Convenience method for visiting nodes that may be null. */ R visit(Node node) => (node == null) ? null : node.accept(this); void error(Spannable node, MessageKind kind, [Map arguments = const {}]) { compiler.reportError(node, kind, arguments); } void warning(Spannable node, MessageKind kind, [Map arguments = const {}]) { compiler.reportWarning(node, kind, arguments); } void internalError(Spannable node, message) { compiler.internalError(node, message); } void addDeferredAction(Element element, DeferredAction action) { compiler.enqueuer.resolution.addDeferredAction(element, action); } } abstract class LabelScope { LabelScope get outer; LabelDefinition lookup(String label); } class LabeledStatementLabelScope implements LabelScope { final LabelScope outer; final Map<String, LabelDefinition> labels; LabeledStatementLabelScope(this.outer, this.labels); LabelDefinition lookup(String labelName) { LabelDefinition label = labels[labelName]; if (label != null) return label; return outer.lookup(labelName); } } class SwitchLabelScope implements LabelScope { final LabelScope outer; final Map<String, LabelDefinition> caseLabels; SwitchLabelScope(this.outer, this.caseLabels); LabelDefinition lookup(String labelName) { LabelDefinition result = caseLabels[labelName]; if (result != null) return result; return outer.lookup(labelName); } } class EmptyLabelScope implements LabelScope { const EmptyLabelScope(); LabelDefinition lookup(String label) => null; LabelScope get outer { throw 'internal error: empty label scope has no outer'; } } class StatementScope { LabelScope labels; Link<JumpTarget> breakTargetStack; Link<JumpTarget> continueTargetStack; // Used to provide different numbers to statements if one is inside the other. // Can be used to make otherwise duplicate labels unique. int nestingLevel = 0; StatementScope() : labels = const EmptyLabelScope(), breakTargetStack = const Link<JumpTarget>(), continueTargetStack = const Link<JumpTarget>(); LabelDefinition lookupLabel(String label) { return labels.lookup(label); } JumpTarget currentBreakTarget() => breakTargetStack.isEmpty ? null : breakTargetStack.head; JumpTarget currentContinueTarget() => continueTargetStack.isEmpty ? null : continueTargetStack.head; void enterLabelScope(Map<String, LabelDefinition> elements) { labels = new LabeledStatementLabelScope(labels, elements); nestingLevel++; } void exitLabelScope() { nestingLevel--; labels = labels.outer; } void enterLoop(JumpTarget element) { breakTargetStack = breakTargetStack.prepend(element); continueTargetStack = continueTargetStack.prepend(element); nestingLevel++; } void exitLoop() { nestingLevel--; breakTargetStack = breakTargetStack.tail; continueTargetStack = continueTargetStack.tail; } void enterSwitch(JumpTarget breakElement, Map<String, LabelDefinition> continueElements) { breakTargetStack = breakTargetStack.prepend(breakElement); labels = new SwitchLabelScope(labels, continueElements); nestingLevel++; } void exitSwitch() { nestingLevel--; breakTargetStack = breakTargetStack.tail; labels = labels.outer; } } class TypeResolver { final Compiler compiler; TypeResolver(this.compiler); /// Tries to resolve the type name as an element. Element resolveTypeName(Identifier prefixName, Identifier typeName, Scope scope, {bool deferredIsMalformed: true}) { Element element; bool deferredTypeAnnotation = false; if (prefixName != null) { Element prefixElement = lookupInScope(compiler, prefixName, scope, prefixName.source); if (prefixElement != null && prefixElement.isPrefix) { // The receiver is a prefix. Lookup in the imported members. PrefixElement prefix = prefixElement; element = prefix.lookupLocalMember(typeName.source); // TODO(17260, sigurdm): The test for DartBackend is there because // dart2dart outputs malformed types with prefix. if (element != null && prefix.isDeferred && deferredIsMalformed && compiler.backend is! DartBackend) { element = new ErroneousElementX(MessageKind.DEFERRED_TYPE_ANNOTATION, {'node': typeName}, element.name, element); } } else { // The caller of this method will create the ErroneousElement for // the MalformedType. element = null; } } else { String stringValue = typeName.source; element = lookupInScope(compiler, typeName, scope, typeName.source); } return element; } DartType resolveTypeAnnotation(MappingVisitor visitor, TypeAnnotation node, {bool malformedIsError: false, bool deferredIsMalformed: true}) { ResolutionRegistry registry = visitor.registry; Identifier typeName; DartType type; DartType checkNoTypeArguments(DartType type) { List<DartType> arguments = new List<DartType>(); bool hasTypeArgumentMismatch = resolveTypeArguments( visitor, node, const <DartType>[], arguments); if (hasTypeArgumentMismatch) { return new MalformedType( new ErroneousElementX(MessageKind.TYPE_ARGUMENT_COUNT_MISMATCH, {'type': node}, typeName.source, visitor.enclosingElement), type, arguments); } return type; } Identifier prefixName; Send send = node.typeName.asSend(); if (send != null) { // The type name is of the form [: prefix . identifier :]. prefixName = send.receiver.asIdentifier(); typeName = send.selector.asIdentifier(); } else { typeName = node.typeName.asIdentifier(); if (identical(typeName.source, 'void')) { type = const VoidType(); checkNoTypeArguments(type); registry.useType(node, type); return type; } else if (identical(typeName.source, 'dynamic')) { type = const DynamicType(); checkNoTypeArguments(type); registry.useType(node, type); return type; } } Element element = resolveTypeName(prefixName, typeName, visitor.scope, deferredIsMalformed: deferredIsMalformed); DartType reportFailureAndCreateType(MessageKind messageKind, Map messageArguments, {DartType userProvidedBadType, Element erroneousElement}) { if (malformedIsError) { visitor.error(node, messageKind, messageArguments); } else { registry.registerThrowRuntimeError(); visitor.warning(node, messageKind, messageArguments); } if (erroneousElement == null) { registry.registerThrowRuntimeError(); erroneousElement = new ErroneousElementX( messageKind, messageArguments, typeName.source, visitor.enclosingElement); } List<DartType> arguments = <DartType>[]; resolveTypeArguments(visitor, node, const <DartType>[], arguments); return new MalformedType(erroneousElement, userProvidedBadType, arguments); } // Try to construct the type from the element. if (element == null) { type = reportFailureAndCreateType( MessageKind.CANNOT_RESOLVE_TYPE, {'typeName': node.typeName}); } else if (element.isAmbiguous) { AmbiguousElement ambiguous = element; type = reportFailureAndCreateType( ambiguous.messageKind, ambiguous.messageArguments); ambiguous.diagnose(registry.mapping.analyzedElement, compiler); } else if (element.isErroneous) { if (element is ErroneousElement) { type = reportFailureAndCreateType( element.messageKind, element.messageArguments, erroneousElement: element); } else { type = const DynamicType(); } } else if (!element.impliesType) { type = reportFailureAndCreateType( MessageKind.NOT_A_TYPE, {'node': node.typeName}); } else { bool addTypeVariableBoundsCheck = false; if (element.isClass) { ClassElement cls = element; // TODO(johnniwinther): [_ensureClassWillBeResolved] should imply // [computeType]. compiler.resolver._ensureClassWillBeResolved(cls); element.computeType(compiler); List<DartType> arguments = <DartType>[]; bool hasTypeArgumentMismatch = resolveTypeArguments( visitor, node, cls.typeVariables, arguments); if (hasTypeArgumentMismatch) { type = new BadInterfaceType(cls.declaration, new InterfaceType.forUserProvidedBadType(cls.declaration, arguments)); } else { if (arguments.isEmpty) { type = cls.rawType; } else { type = new InterfaceType(cls.declaration, arguments.toList(growable: false)); addTypeVariableBoundsCheck = true; } } } else if (element.isTypedef) { TypedefElement typdef = element; // TODO(johnniwinther): [ensureResolved] should imply [computeType]. typdef.ensureResolved(compiler); element.computeType(compiler); List<DartType> arguments = <DartType>[]; bool hasTypeArgumentMismatch = resolveTypeArguments( visitor, node, typdef.typeVariables, arguments); if (hasTypeArgumentMismatch) { type = new BadTypedefType(typdef, new TypedefType.forUserProvidedBadType(typdef, arguments)); } else { if (arguments.isEmpty) { type = typdef.rawType; } else { type = new TypedefType(typdef, arguments.toList(growable: false)); addTypeVariableBoundsCheck = true; } } } else if (element.isTypeVariable) { Element outer = visitor.enclosingElement.outermostEnclosingMemberOrTopLevel; bool isInFactoryConstructor = outer != null && outer.isFactoryConstructor; if (!outer.isClass && !outer.isTypedef && !isInFactoryConstructor && Elements.isInStaticContext(visitor.enclosingElement)) { registry.registerThrowRuntimeError(); type = reportFailureAndCreateType( MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER, {'typeVariableName': node}, userProvidedBadType: element.computeType(compiler)); } else { type = element.computeType(compiler); } type = checkNoTypeArguments(type); } else { compiler.internalError(node, "Unexpected element kind ${element.kind}."); } if (addTypeVariableBoundsCheck) { registry.registerTypeVariableBoundCheck(); visitor.addDeferredAction( visitor.enclosingElement, () => checkTypeVariableBounds(node, type)); } } registry.useType(node, type); return type; } /// Checks the type arguments of [type] against the type variable bounds. void checkTypeVariableBounds(TypeAnnotation node, GenericType type) { void checkTypeVariableBound(_, DartType typeArgument, TypeVariableType typeVariable, DartType bound) { if (!compiler.types.isSubtype(typeArgument, bound)) { compiler.reportWarning(node, MessageKind.INVALID_TYPE_VARIABLE_BOUND, {'typeVariable': typeVariable, 'bound': bound, 'typeArgument': typeArgument, 'thisType': type.element.thisType}); } }; compiler.types.checkTypeVariableBounds(type, checkTypeVariableBound); } /** * Resolves the type arguments of [node] and adds these to [arguments]. * * Returns [: true :] if the number of type arguments did not match the * number of type variables. */ bool resolveTypeArguments(MappingVisitor visitor, TypeAnnotation node, List<DartType> typeVariables, List<DartType> arguments) { if (node.typeArguments == null) { return false; } int expectedVariables = typeVariables.length; int index = 0; bool typeArgumentCountMismatch = false; for (Link<Node> typeArguments = node.typeArguments.nodes; !typeArguments.isEmpty; typeArguments = typeArguments.tail, index++) { if (index > expectedVariables - 1) { visitor.warning( typeArguments.head, MessageKind.ADDITIONAL_TYPE_ARGUMENT); typeArgumentCountMismatch = true; } DartType argType = resolveTypeAnnotation(visitor, typeArguments.head); // TODO(karlklose): rewrite to not modify [arguments]. arguments.add(argType); } if (index < expectedVariables) { visitor.warning(node.typeArguments, MessageKind.MISSING_TYPE_ARGUMENT); typeArgumentCountMismatch = true; } return typeArgumentCountMismatch; } } /** * Common supertype for resolver visitors that record resolutions in a * [ResolutionRegistry]. */ abstract class MappingVisitor<T> extends CommonResolverVisitor<T> { final ResolutionRegistry registry; final TypeResolver typeResolver; /// The current enclosing element for the visited AST nodes. Element get enclosingElement; /// The current scope of the visitor. Scope get scope; MappingVisitor(Compiler compiler, ResolutionRegistry this.registry) : typeResolver = new TypeResolver(compiler), super(compiler); AsyncMarker get currentAsyncMarker => AsyncMarker.SYNC; /// Add [element] to the current scope and check for duplicate definitions. void addToScope(Element element) { Element existing = scope.add(element); if (existing != element) { reportDuplicateDefinition(element.name, element, existing); } } void checkLocalDefinitionName(Node node, Element element) { if (currentAsyncMarker != AsyncMarker.SYNC) { if (element.name == 'yield' || element.name == 'async' || element.name == 'await') { compiler.reportError( node, MessageKind.ASYNC_KEYWORD_AS_IDENTIFIER, {'keyword': element.name, 'modifier': currentAsyncMarker}); } } } /// Register [node] as the definition of [element]. void defineLocalVariable(Node node, LocalVariableElement element) { if (element == null) { throw compiler.internalError(node, 'element is null'); } checkLocalDefinitionName(node, element); registry.defineElement(node, element); } void reportDuplicateDefinition(String name, Spannable definition, Spannable existing) { compiler.reportError(definition, MessageKind.DUPLICATE_DEFINITION, {'name': name}); compiler.reportInfo(existing, MessageKind.EXISTING_DEFINITION, {'name': name}); } } /** * Core implementation of resolution. * * Do not subclass or instantiate this class outside this library * except for testing. */ class ResolverVisitor extends MappingVisitor<ResolutionResult> { /** * The current enclosing element for the visited AST nodes. * * This field is updated when nested closures are visited. */ Element enclosingElement; bool inInstanceContext; bool inCheckContext; bool inCatchBlock; Scope scope; ClassElement currentClass; ExpressionStatement currentExpressionStatement; bool sendIsMemberAccess = false; StatementScope statementScope; int allowedCategory = ElementCategory.VARIABLE | ElementCategory.FUNCTION | ElementCategory.IMPLIES_TYPE; /** * Record of argument nodes to JS_INTERCEPTOR_CONSTANT for deferred * processing. */ Set<Node> argumentsToJsInterceptorConstant = null; /// When visiting the type declaration of the variable in a [ForIn] loop, /// the initializer of the variable is implicit and we should not emit an /// error when verifying that all final variables are initialized. bool allowFinalWithoutInitializer = false; /// The nodes for which variable access and mutation must be registered in /// order to determine when the static type of variables types is promoted. Link<Node> promotionScope = const Link<Node>(); bool isPotentiallyMutableTarget(Element target) { if (target == null) return false; return (target.isVariable || target.isParameter) && !(target.isFinal || target.isConst); } // TODO(ahe): Find a way to share this with runtime implementation. static final RegExp symbolValidationPattern = new RegExp(r'^(?:[a-zA-Z$][a-zA-Z$0-9_]*\.)*(?:[a-zA-Z$][a-zA-Z$0-9_]*=?|' r'-|' r'unary-|' r'\[\]=|' r'~|' r'==|' r'\[\]|' r'\*|' r'/|' r'%|' r'~/|' r'\+|' r'<<|' r'>>|' r'>=|' r'>|' r'<=|' r'<|' r'&|' r'\^|' r'\|' r')$'); ResolverVisitor(Compiler compiler, Element element, ResolutionRegistry registry, {bool useEnclosingScope: false}) : this.enclosingElement = element, // When the element is a field, we are actually resolving its // initial value, which should not have access to instance // fields. inInstanceContext = (element.isInstanceMember && !element.isField) || element.isGenerativeConstructor, this.currentClass = element.isClassMember ? element.enclosingClass : null, this.statementScope = new StatementScope(), scope = useEnclosingScope ? Scope.buildEnclosingScope(element) : element.buildScope(), // The type annotations on a typedef do not imply type checks. // TODO(karlklose): clean this up (dartbug.com/8870). inCheckContext = compiler.enableTypeAssertions && !element.isLibrary && !element.isTypedef && !element.enclosingElement.isTypedef, inCatchBlock = false, super(compiler, registry); AsyncMarker get currentAsyncMarker { if (enclosingElement is FunctionElement) { FunctionElement function = enclosingElement; return function.asyncMarker; } return AsyncMarker.SYNC; } Element reportLookupErrorIfAny(Element result, Node node, String name) { if (!Elements.isUnresolved(result)) { if (!inInstanceContext && result.isInstanceMember) { compiler.reportError( node, MessageKind.NO_INSTANCE_AVAILABLE, {'name': name}); return new ErroneousElementX(MessageKind.NO_INSTANCE_AVAILABLE, {'name': name}, name, enclosingElement); } else if (result.isAmbiguous) { AmbiguousElement ambiguous = result; compiler.reportError( node, ambiguous.messageKind, ambiguous.messageArguments); ambiguous.diagnose(enclosingElement, compiler); return new ErroneousElementX(ambiguous.messageKind, ambiguous.messageArguments, name, enclosingElement); } } return result; } // Create, or reuse an already created, target element for a statement. JumpTarget getOrDefineTarget(Node statement) { JumpTarget element = registry.getTargetDefinition(statement); if (element == null) { element = new JumpTargetX(statement, statementScope.nestingLevel, enclosingElement); registry.defineTarget(statement, element); } return element; } doInCheckContext(action()) { bool wasInCheckContext = inCheckContext; inCheckContext = true; var result = action(); inCheckContext = wasInCheckContext; return result; } inStaticContext(action()) { bool wasInstanceContext = inInstanceContext; inInstanceContext = false; var result = action(); inInstanceContext = wasInstanceContext; return result; } doInPromotionScope(Node node, action()) { promotionScope = promotionScope.prepend(node); var result = action(); promotionScope = promotionScope.tail; return result; } visitInStaticContext(Node node) { inStaticContext(() => visit(node)); } ErroneousElement warnAndCreateErroneousElement(Node node, String name, MessageKind kind, [Map arguments = const {}]) { compiler.reportWarning(node, kind, arguments); // TODO(ahe): Use [allowedCategory] to synthesize a more precise subclass // of [ErroneousElementX]. For example, [ErroneousFieldElementX], // [ErroneousConstructorElementX], etc. return new ErroneousElementX(kind, arguments, name, enclosingElement); } ResolutionResult visitIdentifier(Identifier node) { if (node.isThis()) { if (!inInstanceContext) { error(node, MessageKind.NO_INSTANCE_AVAILABLE, {'name': node}); } return null; } else if (node.isSuper()) { if (!inInstanceContext) { error(node, MessageKind.NO_SUPER_IN_STATIC); } if ((ElementCategory.SUPER & allowedCategory) == 0) { error(node, MessageKind.INVALID_USE_OF_SUPER); } return null; } else { String name = node.source; Element element = lookupInScope(compiler, node, scope, name); if (Elements.isUnresolved(element) && name == 'dynamic') { // TODO(johnniwinther): Remove this hack when we can return more complex // objects than [Element] from this method. element = compiler.typeClass; // Set the type to be `dynamic` to mark that this is a type literal. registry.setType(node, const DynamicType()); } element = reportLookupErrorIfAny(element, node, node.source); if (element == null) { if (!inInstanceContext) { element = warnAndCreateErroneousElement( node, node.source, MessageKind.CANNOT_RESOLVE, {'name': node}); registry.registerThrowNoSuchMethod(); } } else if (element.isErroneous) { // Use the erroneous element. } else { if ((element.kind.category & allowedCategory) == 0) { element = warnAndCreateErroneousElement( node, name, MessageKind.GENERIC, // TODO(ahe): Improve error message. Need UX input. {'text': "is not an expression $element"}); } } if (!Elements.isUnresolved(element) && element.isClass) { ClassElement classElement = element; classElement.ensureResolved(compiler); } return new ElementResult(registry.useElement(node, element)); } } ResolutionResult visitTypeAnnotation(TypeAnnotation node) { DartType type = resolveTypeAnnotation(node); if (inCheckContext) { registry.registerIsCheck(type); } return new TypeResult(type); } bool isNamedConstructor(Send node) => node.receiver != null; Selector getRedirectingThisOrSuperConstructorSelector(Send node) { if (isNamedConstructor(node)) { String constructorName = node.selector.asIdentifier().source; return new Selector.callConstructor( constructorName, enclosingElement.library); } else { return new Selector.callDefaultConstructor(); } } FunctionElement resolveConstructorRedirection(FunctionElementX constructor) { FunctionExpression node = constructor.parseNode(compiler); // A synthetic constructor does not have a node. if (node == null) return null; if (node.initializers == null) return null; Link<Node> initializers = node.initializers.nodes; if (!initializers.isEmpty && Initializers.isConstructorRedirect(initializers.head)) { Selector selector = getRedirectingThisOrSuperConstructorSelector(initializers.head); final ClassElement classElement = constructor.enclosingClass; return classElement.lookupConstructor(selector.name); } return null; } void setupFunction(FunctionExpression node, FunctionElement function) { Element enclosingElement = function.enclosingElement; if (node.modifiers.isStatic && enclosingElement.kind != ElementKind.CLASS) { compiler.reportError(node, MessageKind.ILLEGAL_STATIC); } scope = new MethodScope(scope, function); // Put the parameters in scope. FunctionSignature functionParameters = function.functionSignature; Link<Node> parameterNodes = (node.parameters == null) ? const Link<Node>() : node.parameters.nodes; functionParameters.forEachParameter((ParameterElement element) { // TODO(karlklose): should be a list of [FormalElement]s, but the actual // implementation uses [Element]. Link<Element> optionals = functionParameters.optionalParameters; if (!optionals.isEmpty && element == optionals.head) { NodeList nodes = parameterNodes.head; parameterNodes = nodes.nodes; } visit(element.initializer); VariableDefinitions variableDefinitions = parameterNodes.head; Node parameterNode = variableDefinitions.definitions.nodes.head; // Field parameters (this.x) are not visible inside the constructor. The // fields they reference are visible, but must be resolved independently. if (element.isInitializingFormal) { registry.useElement(parameterNode, element); } else { LocalParameterElement parameterElement = element; defineLocalVariable(parameterNode, parameterElement); addToScope(parameterElement); } parameterNodes = parameterNodes.tail; }); addDeferredAction(enclosingElement, () { functionParameters.forEachOptionalParameter((Element parameter) { compiler.resolver.constantCompiler.compileConstant(parameter); }); }); if (inCheckContext) { functionParameters.forEachParameter((ParameterElement element) { registry.registerIsCheck(element.type); }); } } visitCascade(Cascade node) { visit(node.expression); } visitCascadeReceiver(CascadeReceiver node) { visit(node.expression); } visitClassNode(ClassNode node) { internalError(node, "shouldn't be called"); } visitIn(Node node, Scope nestedScope) { Scope oldScope = scope; scope = nestedScope; ResolutionResult result = visit(node); scope = oldScope; return result; } /** * Introduces new default targets for break and continue * before visiting the body of the loop */ visitLoopBodyIn(Loop loop, Node body, Scope bodyScope) { JumpTarget element = getOrDefineTarget(loop); statementScope.enterLoop(element); visitIn(body, bodyScope); statementScope.exitLoop(); if (!element.isTarget) { registry.undefineTarget(loop); } } visitBlock(Block node) { visitIn(node.statements, new BlockScope(scope)); } visitDoWhile(DoWhile node) { visitLoopBodyIn(node, node.body, new BlockScope(scope)); visit(node.condition); } visitEmptyStatement(EmptyStatement node) { } visitExpressionStatement(ExpressionStatement node) { ExpressionStatement oldExpressionStatement = currentExpressionStatement; currentExpressionStatement = node; visit(node.expression); currentExpressionStatement = oldExpressionStatement; } visitFor(For node) { Scope blockScope = new BlockScope(scope); visitIn(node.initializer, blockScope); visitIn(node.condition, blockScope); visitIn(node.update, blockScope); visitLoopBodyIn(node, node.body, blockScope); } visitFunctionDeclaration(FunctionDeclaration node) { assert(node.function.name != null); visitFunctionExpression(node.function, inFunctionDeclaration: true); } /// Process a local function declaration or an anonymous function expression. /// /// [inFunctionDeclaration] is `true` when the current node is the immediate /// child of a function declaration. /// /// This is used to distinguish local function declarations from anonymous /// function expressions. visitFunctionExpression(FunctionExpression node, {bool inFunctionDeclaration: false}) { bool doAddToScope = inFunctionDeclaration; if (!inFunctionDeclaration && node.name != null) { compiler.reportError( node.name, MessageKind.NAMED_FUNCTION_EXPRESSION, {'name': node.name}); } visit(node.returnType); String name; if (node.name == null) { name = ""; } else { name = node.name.asIdentifier().source; } LocalFunctionElementX function = new LocalFunctionElementX( name, node, ElementKind.FUNCTION, Modifiers.EMPTY, enclosingElement); ResolverTask.processAsyncMarker(compiler, function, registry); function.functionSignatureCache = SignatureResolver.analyze( compiler, node.parameters, node.returnType, function, registry, createRealParameters: true, isFunctionExpression: !inFunctionDeclaration); checkLocalDefinitionName(node, function); registry.defineFunction(node, function); if (doAddToScope) { addToScope(function); } Scope oldScope = scope; // The scope is modified by [setupFunction]. setupFunction(node, function); Element previousEnclosingElement = enclosingElement; enclosingElement = function; // Run the body in a fresh statement scope. StatementScope oldStatementScope = statementScope; statementScope = new StatementScope(); visit(node.body); statementScope = oldStatementScope; scope = oldScope; enclosingElement = previousEnclosingElement; registry.registerClosure(function); registry.registerInstantiatedClass(compiler.functionClass); } visitIf(If node) { doInPromotionScope(node.condition.expression, () => visit(node.condition)); doInPromotionScope(node.thenPart, () => visitIn(node.thenPart, new BlockScope(scope))); visitIn(node.elsePart, new BlockScope(scope)); } ResolutionResult resolveSend(Send node) { Selector selector = resolveSelector(node, null); if (node.isSuperCall) registry.registerSuperUse(node); if (node.receiver == null) { // If this send is of the form "assert(expr);", then // this is an assertion. if (selector.isAssert) { if (selector.argumentCount != 1) { error(node.selector, MessageKind.WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT, {'argumentCount': selector.argumentCount}); } else if (selector.namedArgumentCount != 0) { error(node.selector, MessageKind.ASSERT_IS_GIVEN_NAMED_ARGUMENTS, {'argumentCount': selector.namedArgumentCount}); } registry.registerAssert(node); return const AssertResult(); } return node.selector.accept(this); } var oldCategory = allowedCategory; allowedCategory |= ElementCategory.PREFIX | ElementCategory.SUPER; ResolutionResult resolvedReceiver = visit(node.receiver); allowedCategory = oldCategory; Element target; String name = node.selector.asIdentifier().source; if (identical(name, 'this')) { // TODO(ahe): Why is this using GENERIC? error(node.selector, MessageKind.GENERIC, {'text': "expected an identifier"}); return null; } else if (node.isSuperCall) { if (node.isOperator) { if (isUserDefinableOperator(name)) { name = selector.name; } else { error(node.selector, MessageKind.ILLEGAL_SUPER_SEND, {'name': name}); return null; } } if (!inInstanceContext) { error(node.receiver, MessageKind.NO_INSTANCE_AVAILABLE, {'name': name}); return null; } if (currentClass.supertype == null) { // This is just to guard against internal errors, so no need // for a real error message. error(node.receiver, MessageKind.GENERIC, {'text': "Object has no superclass"}); return null; } // TODO(johnniwinther): Ensure correct behavior if currentClass is a // patch. target = currentClass.lookupSuperSelector(selector); // [target] may be null which means invoking noSuchMethod on // super. if (target == null) { target = warnAndCreateErroneousElement( node, name, MessageKind.NO_SUCH_SUPER_MEMBER, {'className': currentClass, 'memberName': name}); // We still need to register the invocation, because we might // call [:super.noSuchMethod:] which calls // [JSInvocationMirror._invokeOn]. registry.registerDynamicInvocation(selector); registry.registerSuperNoSuchMethod(); } } else if (resolvedReceiver == null || Elements.isUnresolved(resolvedReceiver.element)) { return null; } else if (resolvedReceiver.element.isClass) { ClassElement receiverClass = resolvedReceiver.element; receiverClass.ensureResolved(compiler); if (node.isOperator) { // When the resolved receiver is a class, we can have two cases: // 1) a static send: C.foo, or // 2) an operator send, where the receiver is a class literal: 'C + 1'. // The following code that looks up the selector on the resolved // receiver will treat the second as the invocation of a static operator // if the resolved receiver is not null. return null; } MembersCreator.computeClassMembersByName( compiler, receiverClass.declaration, name); target = receiverClass.lookupLocalMember(name); if (target == null || target.isInstanceMember) { registry.registerThrowNoSuchMethod(); // TODO(johnniwinther): With the simplified [TreeElements] invariant, // try to resolve injected elements if [currentClass] is in the patch // library of [receiverClass]. // TODO(karlklose): this should be reported by the caller of // [resolveSend] to select better warning messages for getters and // setters. MessageKind kind = (target == null) ? MessageKind.MEMBER_NOT_FOUND : MessageKind.MEMBER_NOT_STATIC; return new ElementResult(warnAndCreateErroneousElement( node, name, kind, {'className': receiverClass.name, 'memberName': name})); } else if (isPrivateName(name) && target.library != enclosingElement.library) { registry.registerThrowNoSuchMethod(); return new ElementResult(warnAndCreateErroneousElement( node, name, MessageKind.PRIVATE_ACCESS, {'libraryName': target.library.getLibraryOrScriptName(), 'name': name})); } } else if (resolvedReceiver.element.isPrefix) { PrefixElement prefix = resolvedReceiver.element; target = prefix.lookupLocalMember(name); if (Elements.isUnresolved(target)) { registry.registerThrowNoSuchMethod(); return new ElementResult(warnAndCreateErroneousElement( node, name, MessageKind.NO_SUCH_LIBRARY_MEMBER, {'libraryName': prefix.name, 'memberName': name})); } else if (target.isAmbiguous) { registry.registerThrowNoSuchMethod(); AmbiguousElement ambiguous = target; target = warnAndCreateErroneousElement(node, name, ambiguous.messageKind, ambiguous.messageArguments); ambiguous.diagnose(enclosingElement, compiler); return new ElementResult(target); } else if (target.kind == ElementKind.CLASS) { ClassElement classElement = target; classElement.ensureResolved(compiler); } } return new ElementResult(target); } static Selector computeSendSelector(Send node, LibraryElement library, Element element) { // First determine if this is part of an assignment. bool isSet = node.asSendSet() != null; if (node.isIndex) { return isSet ? new Selector.indexSet() : new Selector.index(); } if (node.isOperator) { String source = node.selector.asOperator().source; String string = source; if (identical(string, '!') || identical(string, '&&') || identical(string, '||') || identical(string, 'is') || identical(string, 'as') || identical(string, '?') || identical(string, '>>>')) { return null; } String op = source; if (!isUserDefinableOperator(source)) { op = Elements.mapToUserOperatorOrNull(source); } if (op == null) { // Unsupported operator. An error has been reported during parsing. return new Selector.call( source, library, node.argumentsNode.slowLength(), []); } return node.arguments.isEmpty ? new Selector.unaryOperator(op) : new Selector.binaryOperator(op); } Identifier identifier = node.selector.asIdentifier(); if (node.isPropertyAccess) { assert(!isSet); return new Selector.getter(identifier.source, library); } else if (isSet) { return new Selector.setter(identifier.source, library); } // Compute the arity and the list of named arguments. int arity = 0; List<String> named = <String>[]; for (Link<Node> link = node.argumentsNode.nodes; !link.isEmpty; link = link.tail) { Expression argument = link.head; NamedArgument namedArgument = argument.asNamedArgument(); if (namedArgument != null) { named.add(namedArgument.name.source); } arity++; } if (element != null && element.isConstructor) { return new Selector.callConstructor( element.name, library, arity, named); } // If we're invoking a closure, we do not have an identifier. return (identifier == null) ? new Selector.callClosure(arity, named) : new Selector.call(identifier.source, library, arity, named); } Selector resolveSelector(Send node, Element element) { LibraryElement library = enclosingElement.library; Selector selector = computeSendSelector(node, library, element); if (selector != null) registry.setSelector(node, selector); return selector; } void resolveArguments(NodeList list) { if (list == null) return; bool oldSendIsMemberAccess = sendIsMemberAccess; sendIsMemberAccess = false; Map<String, Node> seenNamedArguments = new Map<String, Node>(); for (Link<Node> link = list.nodes; !link.isEmpty; link = link.tail) { Expression argument = link.head; visit(argument); NamedArgument namedArgument = argument.asNamedArgument(); if (namedArgument != null) { String source = namedArgument.name.source; if (seenNamedArguments.containsKey(source)) { reportDuplicateDefinition( source, argument, seenNamedArguments[source]); } else { seenNamedArguments[source] = namedArgument; } } else if (!seenNamedArguments.isEmpty) { error(argument, MessageKind.INVALID_ARGUMENT_AFTER_NAMED); } } sendIsMemberAccess = oldSendIsMemberAccess; } ResolutionResult visitSend(Send node) { bool oldSendIsMemberAccess = sendIsMemberAccess; sendIsMemberAccess = node.isPropertyAccess || node.isCall; ResolutionResult result; if (node.isLogicalAnd) { result = doInPromotionScope(node.receiver, () => resolveSend(node)); } else { result = resolveSend(node); } sendIsMemberAccess = oldSendIsMemberAccess; Element target = result != null ? result.element : null; if (target != null && target == compiler.mirrorSystemGetNameFunction && !compiler.mirrorUsageAnalyzerTask.hasMirrorUsage(enclosingElement)) { compiler.reportHint( node.selector, MessageKind.STATIC_FUNCTION_BLOAT, {'class': compiler.mirrorSystemClass.name, 'name': compiler.mirrorSystemGetNameFunction.name}); } if (target != null) { if (target.isErroneous) { registry.registerThrowNoSuchMethod(); } else if (target.isAbstractField) { AbstractFieldElement field = target; target = field.getter; if (target == null && !inInstanceContext) { registry.registerThrowNoSuchMethod(); target = warnAndCreateErroneousElement(node.selector, field.name, MessageKind.CANNOT_RESOLVE_GETTER); } } else if (target.isTypeVariable) { ClassElement cls = target.enclosingClass; assert(enclosingElement.enclosingClass == cls); if (Elements.isInStaticContext(enclosingElement)) { compiler.reportError(node, MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER, {'typeVariableName': node.selector}); } registry.registerClassUsingVariableExpression(cls); registry.registerTypeVariableExpression(); // Set the type of the node to [Type] to mark this send as a // type variable expression. registry.registerTypeLiteral(node, target.computeType(compiler)); } else if (target.impliesType && (!sendIsMemberAccess || node.isCall)) { // Set the type of the node to [Type] to mark this send as a // type literal. DartType type; // TODO(johnniwinther): Remove this hack when we can pass more complex // information between methods than resolved elements. if (target == compiler.typeClass && node.receiver == null) { // Potentially a 'dynamic' type literal. type = registry.getType(node.selector); } if (type == null) { type = target.computeType(compiler); } registry.registerTypeLiteral(node, type); // Don't try to make constants of calls to type literals. if (!node.isCall) { analyzeConstantDeferred(node); } else { // The node itself is not a constant but we register the selector (the // identifier that refers to the class/typedef) as a constant. if (node.receiver != null) { // This is a hack for the case of prefix.Type, we need to store // the element on the selector, so [analyzeConstant] can build // the type literal from the selector. registry.useElement(node.selector, target); } analyzeConstantDeferred(node.selector); } } if (isPotentiallyMutableTarget(target)) { if (enclosingElement != target.enclosingElement) { for (Node scope in promotionScope) { registry.setAccessedByClosureIn(scope, target, node); } } } } bool resolvedArguments = false; if (node.isOperator) { String operatorString = node.selector.asOperator().source; if (identical(operatorString, 'is')) { // TODO(johnniwinther): Use seen type tests to avoid registration of // mutation/access to unpromoted variables. DartType type = resolveTypeAnnotation(node.typeAnnotationFromIsCheckOrCast); if (type != null) { registry.registerIsCheck(type); } resolvedArguments = true; } else if (identical(operatorString, 'as')) { DartType type = resolveTypeAnnotation(node.arguments.head); if (type != null) { registry.registerAsCheck(type); } resolvedArguments = true; } else if (identical(operatorString, '&&')) { doInPromotionScope(node.arguments.head, () => resolveArguments(node.argumentsNode)); resolvedArguments = true; } } if (!resolvedArguments) { resolveArguments(node.argumentsNode); } // If the selector is null, it means that we will not be generating // code for this as a send. Selector selector = registry.getSelector(node); if (selector == null) return null; if (node.isCall) { if (Elements.isUnresolved(target) || target.isGetter || target.isField || Elements.isClosureSend(node, target)) { // If we don't know what we're calling or if we are calling a getter, // we need to register that fact that we may be calling a closure // with the same arguments. Selector call = new Selector.callClosureFrom(selector); registry.registerDynamicInvocation(call); } else if (target.impliesType) { // We call 'call()' on a Type instance returned from the reference to a // class or typedef literal. We do not need to register this call as a // dynamic invocation, because we statically know what the target is. } else { if (target is FunctionElement) { FunctionElement function = target; function.computeSignature(compiler); } if (!selector.applies(target, compiler.world)) { registry.registerThrowNoSuchMethod(); if (node.isSuperCall) { // Similar to what we do when we can't find super via selector // in [resolveSend] above, we still need to register the invocation, // because we might call [:super.noSuchMethod:] which calls // [JSInvocationMirror._invokeOn]. registry.registerDynamicInvocation(selector); registry.registerSuperNoSuchMethod(); } } } if (target != null && target.isForeign(compiler.backend)) { if (selector.name == 'JS') { registry.registerJsCall(node, this); } else if (selector.name == 'JS_EMBEDDED_GLOBAL') { registry.registerJsEmbeddedGlobalCall(node, this); } else if (selector.name == 'JS_INTERCEPTOR_CONSTANT') { if (!node.argumentsNode.isEmpty) { Node argument = node.argumentsNode.nodes.head; if (argumentsToJsInterceptorConstant == null) { argumentsToJsInterceptorConstant = new Set<Node>(); } argumentsToJsInterceptorConstant.add(argument); } } } } registry.useElement(node, target); registerSend(selector, target); if (node.isPropertyAccess && Elements.isStaticOrTopLevelFunction(target)) { registry.registerGetOfStaticFunction(target.declaration); } return node.isPropertyAccess ? new ElementResult(target) : null; } /// Callback for native enqueuer to parse a type. Returns [:null:] on error. DartType resolveTypeFromString(Node node, String typeName) { Element element = lookupInScope(compiler, node, scope, typeName); if (element == null) return null; if (element is! ClassElement) return null; ClassElement cls = element; cls.ensureResolved(compiler); return cls.computeType(compiler); } ResolutionResult visitSendSet(SendSet node) { bool oldSendIsMemberAccess = sendIsMemberAccess; sendIsMemberAccess = node.isPropertyAccess || node.isCall; ResolutionResult result = resolveSend(node); sendIsMemberAccess = oldSendIsMemberAccess; Element target = result != null ? result.element : null; Element setter = target; Element getter = target; String operatorName = node.assignmentOperator.source; String source = operatorName; bool isComplex = !identical(source, '='); if (!(result is AssertResult || Elements.isUnresolved(target))) { if (target.isAbstractField) { AbstractFieldElement field = target; setter = field.setter; getter = field.getter; if (setter == null && !inInstanceContext) { setter = warnAndCreateErroneousElement( node.selector, field.name, MessageKind.CANNOT_RESOLVE_SETTER); registry.registerThrowNoSuchMethod(); } if (isComplex && getter == null && !inInstanceContext) { getter = warnAndCreateErroneousElement( node.selector, field.name, MessageKind.CANNOT_RESOLVE_GETTER); registry.registerThrowNoSuchMethod(); } } else if (target.impliesType) { setter = warnAndCreateErroneousElement( node.selector, target.name, MessageKind.ASSIGNING_TYPE); registry.registerThrowNoSuchMethod(); } else if (target.isFinal || target.isConst || (target.isFunction && Elements.isStaticOrTopLevelFunction(target) && !target.isSetter)) { if (target.isFunction) { setter = warnAndCreateErroneousElement( node.selector, target.name, MessageKind.ASSIGNING_METHOD); } else { setter = warnAndCreateErroneousElement( node.selector, target.name, MessageKind.CANNOT_RESOLVE_SETTER); } registry.registerThrowNoSuchMethod(); } if (isPotentiallyMutableTarget(target)) { registry.registerPotentialMutation(target, node); if (enclosingElement != target.enclosingElement) { registry.registerPotentialMutationInClosure(target, node); } for (Node scope in promotionScope) { registry.registerPotentialMutationIn(scope, target, node); } } } resolveArguments(node.argumentsNode); Selector selector = registry.getSelector(node); if (isComplex) { Selector getterSelector; if (selector.isSetter) { getterSelector = new Selector.getterFrom(selector); } else { assert(selector.isIndexSet); getterSelector = new Selector.index(); } registerSend(getterSelector, getter); registry.setGetterSelectorInComplexSendSet(node, getterSelector); if (node.isSuperCall) { getter = currentClass.lookupSuperSelector(getterSelector); if (getter == null) { target = warnAndCreateErroneousElement( node, selector.name, MessageKind.NO_SUCH_SUPER_MEMBER, {'className': currentClass, 'memberName': selector.name}); registry.registerSuperNoSuchMethod(); } } registry.useElement(node.selector, getter); // Make sure we include the + and - operators if we are using // the ++ and -- ones. Also, if op= form is used, include op itself. void registerBinaryOperator(String name) { Selector binop = new Selector.binaryOperator(name); registry.registerDynamicInvocation(binop); registry.setOperatorSelectorInComplexSendSet(node, binop); } if (identical(source, '++')) { registerBinaryOperator('+'); registry.registerInstantiatedClass(compiler.intClass); } else if (identical(source, '--')) { registerBinaryOperator('-'); registry.registerInstantiatedClass(compiler.intClass); } else if (source.endsWith('=')) { registerBinaryOperator(Elements.mapToUserOperator(operatorName)); } } registerSend(selector, setter); return new ElementResult(registry.useElement(node, setter)); } void registerSend(Selector selector, Element target) { if (target == null || target.isInstanceMember) { if (selector.isGetter) { registry.registerDynamicGetter(selector); } else if (selector.isSetter) { registry.registerDynamicSetter(selector); } else { registry.registerDynamicInvocation(selector); } } else if (Elements.isStaticOrTopLevel(target)) { // Avoid registration of type variables since they are not analyzable but // instead resolved through their enclosing type declaration. if (!target.isTypeVariable) { // [target] might be the implementation element and only declaration // elements may be registered. registry.registerStaticUse(target.declaration); } } } visitLiteralInt(LiteralInt node) { registry.registerInstantiatedClass(compiler.intClass); } visitLiteralDouble(LiteralDouble node) { registry.registerInstantiatedClass(compiler.doubleClass); } visitLiteralBool(LiteralBool node) { registry.registerInstantiatedClass(compiler.boolClass); } visitLiteralString(LiteralString node) { registry.registerInstantiatedClass(compiler.stringClass); } visitLiteralNull(LiteralNull node) { registry.registerInstantiatedClass(compiler.nullClass); } visitLiteralSymbol(LiteralSymbol node) { registry.registerInstantiatedClass(compiler.symbolClass); registry.registerStaticUse(compiler.symbolConstructor.declaration); registry.registerConstSymbol(node.slowNameString); if (!validateSymbol(node, node.slowNameString, reportError: false)) { compiler.reportError(node, MessageKind.UNSUPPORTED_LITERAL_SYMBOL, {'value': node.slowNameString}); } analyzeConstantDeferred(node); } visitStringJuxtaposition(StringJuxtaposition node) { registry.registerInstantiatedClass(compiler.stringClass); node.visitChildren(this); } visitNodeList(NodeList node) { for (Link<Node> link = node.nodes; !link.isEmpty; link = link.tail) { visit(link.head); } } visitOperator(Operator node) { internalError(node, 'operator'); } visitRethrow(Rethrow node) { if (!inCatchBlock) { error(node, MessageKind.THROW_WITHOUT_EXPRESSION); } } visitReturn(Return node) { Node expression = node.expression; if (expression != null) { if (enclosingElement.isGenerativeConstructor) { // It is a compile-time error if a return statement of the form // `return e;` appears in a generative constructor. (Dart Language // Specification 13.12.) compiler.reportError(expression, MessageKind.CANNOT_RETURN_FROM_CONSTRUCTOR); } else if (!node.isArrowBody && currentAsyncMarker.isYielding) { compiler.reportError( node, MessageKind.RETURN_IN_GENERATOR, {'modifier': currentAsyncMarker}); } } visit(node.expression); } visitYield(Yield node) { compiler.streamClass.ensureResolved(compiler); compiler.iterableClass.ensureResolved(compiler); visit(node.expression); } visitRedirectingFactoryBody(RedirectingFactoryBody node) { final isSymbolConstructor = enclosingElement == compiler.symbolConstructor; if (!enclosingElement.isFactoryConstructor) { compiler.reportError( node, MessageKind.FACTORY_REDIRECTION_IN_NON_FACTORY); compiler.reportHint( enclosingElement, MessageKind.MISSING_FACTORY_KEYWORD); } ConstructorElementX constructor = enclosingElement; bool isConstConstructor = constructor.isConst; ConstructorElement redirectionTarget = resolveRedirectingFactory( node, inConstContext: isConstConstructor); constructor.immediateRedirectionTarget = redirectionTarget; registry.setRedirectingTargetConstructor(node, redirectionTarget); if (Elements.isUnresolved(redirectionTarget)) { registry.registerThrowNoSuchMethod(); return; } else { if (isConstConstructor && !redirectionTarget.isConst) { compiler.reportError(node, MessageKind.CONSTRUCTOR_IS_NOT_CONST); } if (redirectionTarget == constructor) { compiler.reportError(node, MessageKind.CYCLIC_REDIRECTING_FACTORY); } } // Check that the target constructor is type compatible with the // redirecting constructor. ClassElement targetClass = redirectionTarget.enclosingClass; InterfaceType type = registry.getType(node); FunctionType targetType = redirectionTarget.computeType(compiler) .subst(type.typeArguments, targetClass.typeVariables); FunctionType constructorType = constructor.computeType(compiler); bool isSubtype = compiler.types.isSubtype(targetType, constructorType); if (!isSubtype) { warning(node, MessageKind.NOT_ASSIGNABLE, {'fromType': targetType, 'toType': constructorType}); } FunctionSignature targetSignature = redirectionTarget.computeSignature(compiler); FunctionSignature constructorSignature = constructor.computeSignature(compiler); if (!targetSignature.isCompatibleWith(constructorSignature)) { assert(!isSubtype); registry.registerThrowNoSuchMethod(); } // Register a post process to check for cycles in the redirection chain and // set the actual generative constructor at the end of the chain. addDeferredAction(constructor, () { compiler.resolver.resolveRedirectionChain(constructor, node); }); registry.registerStaticUse(redirectionTarget); // TODO(johnniwinther): Register the effective target type instead. registry.registerInstantiatedClass( redirectionTarget.enclosingClass.declaration); if (isSymbolConstructor) { registry.registerSymbolConstructor(); } } visitThrow(Throw node) { registry.registerThrowExpression(); visit(node.expression); } visitAwait(Await node) { compiler.futureClass.ensureResolved(compiler); visit(node.expression); } visitVariableDefinitions(VariableDefinitions node) { DartType type; if (node.type != null) { type = resolveTypeAnnotation(node.type); } else { type = const DynamicType(); } VariableList variables = new VariableList.node(node, type); VariableDefinitionsVisitor visitor = new VariableDefinitionsVisitor(compiler, node, this, variables); Modifiers modifiers = node.modifiers; void reportExtraModifier(String modifier) { Node modifierNode; for (Link<Node> nodes = modifiers.nodes.nodes; !nodes.isEmpty; nodes = nodes.tail) { if (modifier == nodes.head.asIdentifier().source) { modifierNode = nodes.head; break; } } assert(modifierNode != null); compiler.reportError(modifierNode, MessageKind.EXTRANEOUS_MODIFIER, {'modifier': modifier}); } if (modifiers.isFinal && (modifiers.isConst || modifiers.isVar)) { reportExtraModifier('final'); } if (modifiers.isVar && (modifiers.isConst || node.type != null)) { reportExtraModifier('var'); } if (enclosingElement.isFunction) { if (modifiers.isAbstract) { reportExtraModifier('abstract'); } if (modifiers.isStatic) { reportExtraModifier('static'); } } if (node.metadata != null) { variables.metadata = compiler.resolver.resolveMetadata(enclosingElement, node); } visitor.visit(node.definitions); } visitWhile(While node) { visit(node.condition); visitLoopBodyIn(node, node.body, new BlockScope(scope)); } visitParenthesizedExpression(ParenthesizedExpression node) { bool oldSendIsMemberAccess = sendIsMemberAccess; sendIsMemberAccess = false; visit(node.expression); sendIsMemberAccess = oldSendIsMemberAccess; } ResolutionResult visitNewExpression(NewExpression node) { Node selector = node.send.selector; FunctionElement constructor = resolveConstructor(node); final bool isSymbolConstructor = constructor == compiler.symbolConstructor; final bool isMirrorsUsedConstant = node.isConst && (constructor == compiler.mirrorsUsedConstructor); Selector callSelector = resolveSelector(node.send, constructor); resolveArguments(node.send.argumentsNode); registry.useElement(node.send, constructor); if (Elements.isUnresolved(constructor)) { return new ElementResult(constructor); } constructor.computeSignature(compiler); if (!callSelector.applies(constructor, compiler.world)) { registry.registerThrowNoSuchMethod(); } // [constructor] might be the implementation element // and only declaration elements may be registered. registry.registerStaticUse(constructor.declaration); ClassElement cls = constructor.enclosingClass; if (cls.isEnumClass && currentClass != cls) { compiler.reportError(node, MessageKind.CANNOT_INSTANTIATE_ENUM, {'enumName': cls.name}); } InterfaceType type = registry.getType(node); if (node.isConst && type.containsTypeVariables) { compiler.reportError(node.send.selector, MessageKind.TYPE_VARIABLE_IN_CONSTANT); } // TODO(johniwinther): Avoid registration of `type` in face of redirecting // factory constructors. registry.registerInstantiatedType(type); if (constructor.isGenerativeConstructor && cls.isAbstract) { warning(node, MessageKind.ABSTRACT_CLASS_INSTANTIATION); registry.registerAbstractClassInstantiation(); } if (isSymbolConstructor) { if (node.isConst) { Node argumentNode = node.send.arguments.head; ConstantExpression constant = compiler.resolver.constantCompiler.compileNode( argumentNode, registry.mapping); ConstantValue name = constant.value; if (!name.isString) { DartType type = name.getType(compiler.coreTypes); compiler.reportError(argumentNode, MessageKind.STRING_EXPECTED, {'type': type}); } else { StringConstantValue stringConstant = name; String nameString = stringConstant.toDartString().slowToString(); if (validateSymbol(argumentNode, nameString)) { registry.registerConstSymbol(nameString); } } } else { if (!compiler.mirrorUsageAnalyzerTask.hasMirrorUsage( enclosingElement)) { compiler.reportHint( node.newToken, MessageKind.NON_CONST_BLOAT, {'name': compiler.symbolClass.name}); } registry.registerNewSymbol(); } } else if (isMirrorsUsedConstant) { compiler.mirrorUsageAnalyzerTask.validate(node, registry.mapping); } if (node.isConst) { analyzeConstantDeferred(node); } return null; } void checkConstMapKeysDontOverrideEquals(Spannable spannable, MapConstantValue map) { for (ConstantValue key in map.keys) { if (!key.isObject) continue; ObjectConstantValue objectConstant = key; DartType keyType = objectConstant.type; ClassElement cls = keyType.element; if (cls == compiler.stringClass) continue; Element equals = cls.lookupMember('=='); if (equals.enclosingClass != compiler.objectClass) { compiler.reportError(spannable, MessageKind.CONST_MAP_KEY_OVERRIDES_EQUALS, {'type': keyType}); } } } void analyzeConstant(Node node) { ConstantExpression constant = compiler.resolver.constantCompiler.compileNode( node, registry.mapping); if (constant == null) { assert(invariant(node, compiler.compilationFailed)); return; } ConstantValue value = constant.value; if (value.isMap) { checkConstMapKeysDontOverrideEquals(node, value); } // The type constant that is an argument to JS_INTERCEPTOR_CONSTANT names // a class that will be instantiated outside the program by attaching a // native class dispatch record referencing the interceptor. if (argumentsToJsInterceptorConstant != null && argumentsToJsInterceptorConstant.contains(node)) { if (value.isType) { TypeConstantValue typeConstant = value; if (typeConstant.representedType is InterfaceType) { registry.registerInstantiatedType(typeConstant.representedType); } else { compiler.reportError(node, MessageKind.WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT); } } else { compiler.reportError(node, MessageKind.WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT); } } } void analyzeConstantDeferred(Node node) { addDeferredAction(enclosingElement, () { analyzeConstant(node); }); } bool validateSymbol(Node node, String name, {bool reportError: true}) { if (name.isEmpty) return true; if (name.startsWith('_')) { if (reportError) { compiler.reportError(node, MessageKind.PRIVATE_IDENTIFIER, {'value': name}); } return false; } if (!symbolValidationPattern.hasMatch(name)) { if (reportError) { compiler.reportError(node, MessageKind.INVALID_SYMBOL, {'value': name}); } return false; } return true; } /** * Try to resolve the constructor that is referred to by [node]. * Note: this function may return an ErroneousFunctionElement instead of * [:null:], if there is no corresponding constructor, class or library. */ ConstructorElement resolveConstructor(NewExpression node) { return node.accept(new ConstructorResolver(compiler, this)); } ConstructorElement resolveRedirectingFactory(RedirectingFactoryBody node, {bool inConstContext: false}) { return node.accept(new ConstructorResolver(compiler, this, inConstContext: inConstContext)); } DartType resolveTypeAnnotation(TypeAnnotation node, {bool malformedIsError: false, bool deferredIsMalformed: true}) { DartType type = typeResolver.resolveTypeAnnotation( this, node, malformedIsError: malformedIsError, deferredIsMalformed: deferredIsMalformed); if (inCheckContext) { registry.registerIsCheck(type); registry.registerRequiredType(type, enclosingElement); } return type; } visitModifiers(Modifiers node) { internalError(node, 'modifiers'); } visitLiteralList(LiteralList node) { bool oldSendIsMemberAccess = sendIsMemberAccess; sendIsMemberAccess = false; NodeList arguments = node.typeArguments; DartType typeArgument; if (arguments != null) { Link<Node> nodes = arguments.nodes; if (nodes.isEmpty) { // The syntax [: <>[] :] is not allowed. error(arguments, MessageKind.MISSING_TYPE_ARGUMENT); } else { typeArgument = resolveTypeAnnotation(nodes.head); for (nodes = nodes.tail; !nodes.isEmpty; nodes = nodes.tail) { warning(nodes.head, MessageKind.ADDITIONAL_TYPE_ARGUMENT); resolveTypeAnnotation(nodes.head); } } } DartType listType; if (typeArgument != null) { if (node.isConst && typeArgument.containsTypeVariables) { compiler.reportError(arguments.nodes.head, MessageKind.TYPE_VARIABLE_IN_CONSTANT); } listType = new InterfaceType(compiler.listClass, [typeArgument]); } else { compiler.listClass.computeType(compiler); listType = compiler.listClass.rawType; } registry.setType(node, listType); registry.registerInstantiatedType(listType); registry.registerRequiredType(listType, enclosingElement); visit(node.elements); if (node.isConst) { analyzeConstantDeferred(node); } sendIsMemberAccess = false; } visitConditional(Conditional node) { doInPromotionScope(node.condition, () => visit(node.condition)); doInPromotionScope(node.thenExpression, () => visit(node.thenExpression)); visit(node.elseExpression); } visitStringInterpolation(StringInterpolation node) { registry.registerInstantiatedClass(compiler.stringClass); registry.registerStringInterpolation(); node.visitChildren(this); } visitStringInterpolationPart(StringInterpolationPart node) { registerImplicitInvocation('toString', 0); node.visitChildren(this); } visitBreakStatement(BreakStatement node) { JumpTarget target; if (node.target == null) { target = statementScope.currentBreakTarget(); if (target == null) { error(node, MessageKind.NO_BREAK_TARGET); return; } target.isBreakTarget = true; } else { String labelName = node.target.source; LabelDefinition label = statementScope.lookupLabel(labelName); if (label == null) { error(node.target, MessageKind.UNBOUND_LABEL, {'labelName': labelName}); return; } target = label.target; if (!target.statement.isValidBreakTarget()) { error(node.target, MessageKind.INVALID_BREAK); return; } label.setBreakTarget(); registry.useLabel(node, label); } registry.registerTargetOf(node, target); } visitContinueStatement(ContinueStatement node) { JumpTarget target; if (node.target == null) { target = statementScope.currentContinueTarget(); if (target == null) { error(node, MessageKind.NO_CONTINUE_TARGET); return; } target.isContinueTarget = true; } else { String labelName = node.target.source; LabelDefinition label = statementScope.lookupLabel(labelName); if (label == null) { error(node.target, MessageKind.UNBOUND_LABEL, {'labelName': labelName}); return; } target = label.target; if (!target.statement.isValidContinueTarget()) { error(node.target, MessageKind.INVALID_CONTINUE); } label.setContinueTarget(); registry.useLabel(node, label); } registry.registerTargetOf(node, target); } registerImplicitInvocation(String name, int arity) { Selector selector = new Selector.call(name, null, arity); registry.registerDynamicInvocation(selector); } visitForIn(ForIn node) { LibraryElement library = enclosingElement.library; registry.setIteratorSelector(node, compiler.iteratorSelector); registry.registerDynamicGetter(compiler.iteratorSelector); registry.setCurrentSelector(node, compiler.currentSelector); registry.registerDynamicGetter(compiler.currentSelector); registry.setMoveNextSelector(node, compiler.moveNextSelector); registry.registerDynamicInvocation(compiler.moveNextSelector); visit(node.expression); Scope blockScope = new BlockScope(scope); Node declaration = node.declaredIdentifier; bool oldAllowFinalWithoutInitializer = allowFinalWithoutInitializer; allowFinalWithoutInitializer = true; visitIn(declaration, blockScope); allowFinalWithoutInitializer = oldAllowFinalWithoutInitializer; Send send = declaration.asSend(); VariableDefinitions variableDefinitions = declaration.asVariableDefinitions(); Element loopVariable; Selector loopVariableSelector; if (send != null) { loopVariable = registry.getDefinition(send); Identifier identifier = send.selector.asIdentifier(); if (identifier == null) { compiler.reportError(send.selector, MessageKind.INVALID_FOR_IN); } else { loopVariableSelector = new Selector.setter(identifier.source, library); } if (send.receiver != null) { compiler.reportError(send.receiver, MessageKind.INVALID_FOR_IN); } } else if (variableDefinitions != null) { Link<Node> nodes = variableDefinitions.definitions.nodes; if (!nodes.tail.isEmpty) { compiler.reportError(nodes.tail.head, MessageKind.INVALID_FOR_IN); } Node first = nodes.head; Identifier identifier = first.asIdentifier(); if (identifier == null) { compiler.reportError(first, MessageKind.INVALID_FOR_IN); } else { loopVariableSelector = new Selector.setter(identifier.source, library); loopVariable = registry.getDefinition(identifier); } } else { compiler.reportError(declaration, MessageKind.INVALID_FOR_IN); } if (loopVariableSelector != null) { registry.setSelector(declaration, loopVariableSelector); registerSend(loopVariableSelector, loopVariable); } else { // The selector may only be null if we reported an error. assert(invariant(declaration, compiler.compilationFailed)); } if (loopVariable != null) { // loopVariable may be null if it could not be resolved. registry.setForInVariable(node, loopVariable); } visitLoopBodyIn(node, node.body, blockScope); } visitLabel(Label node) { // Labels are handled by their containing statements/cases. } visitLabeledStatement(LabeledStatement node) { Statement body = node.statement; JumpTarget targetElement = getOrDefineTarget(body); Map<String, LabelDefinition> labelElements = <String, LabelDefinition>{}; for (Label label in node.labels) { String labelName = label.labelName; if (labelElements.containsKey(labelName)) continue; LabelDefinition element = targetElement.addLabel(label, labelName); labelElements[labelName] = element; } statementScope.enterLabelScope(labelElements); visit(node.statement); statementScope.exitLabelScope(); labelElements.forEach((String labelName, LabelDefinition element) { if (element.isTarget) { registry.defineLabel(element.label, element); } else { warning(element.label, MessageKind.UNUSED_LABEL, {'labelName': labelName}); } }); if (!targetElement.isTarget) { registry.undefineTarget(body); } } visitLiteralMap(LiteralMap node) { bool oldSendIsMemberAccess = sendIsMemberAccess; sendIsMemberAccess = false; NodeList arguments = node.typeArguments; DartType keyTypeArgument; DartType valueTypeArgument; if (arguments != null) { Link<Node> nodes = arguments.nodes; if (nodes.isEmpty) { // The syntax [: <>{} :] is not allowed. error(arguments, MessageKind.MISSING_TYPE_ARGUMENT); } else { keyTypeArgument = resolveTypeAnnotation(nodes.head); nodes = nodes.tail; if (nodes.isEmpty) { warning(arguments, MessageKind.MISSING_TYPE_ARGUMENT); } else { valueTypeArgument = resolveTypeAnnotation(nodes.head); for (nodes = nodes.tail; !nodes.isEmpty; nodes = nodes.tail) { warning(nodes.head, MessageKind.ADDITIONAL_TYPE_ARGUMENT); resolveTypeAnnotation(nodes.head); } } } } DartType mapType; if (valueTypeArgument != null) { mapType = new InterfaceType(compiler.mapClass, [keyTypeArgument, valueTypeArgument]); } else { compiler.mapClass.computeType(compiler); mapType = compiler.mapClass.rawType; } if (node.isConst && mapType.containsTypeVariables) { compiler.reportError(arguments, MessageKind.TYPE_VARIABLE_IN_CONSTANT); } registry.registerMapLiteral(node, mapType, node.isConst); registry.registerRequiredType(mapType, enclosingElement); node.visitChildren(this); if (node.isConst) { analyzeConstantDeferred(node); } sendIsMemberAccess = false; } visitLiteralMapEntry(LiteralMapEntry node) { node.visitChildren(this); } visitNamedArgument(NamedArgument node) { visit(node.expression); } DartType typeOfConstant(ConstantValue constant) { if (constant.isInt) return compiler.intClass.rawType; if (constant.isBool) return compiler.boolClass.rawType; if (constant.isDouble) return compiler.doubleClass.rawType; if (constant.isString) return compiler.stringClass.rawType; if (constant.isNull) return compiler.nullClass.rawType; if (constant.isFunction) return compiler.functionClass.rawType; assert(constant.isObject); ObjectConstantValue objectConstant = constant; return objectConstant.type; } bool overridesEquals(DartType type) { ClassElement cls = type.element; Element equals = cls.lookupMember('=='); return equals.enclosingClass != compiler.objectClass; } void checkCaseExpressions(SwitchStatement node) { JumpTarget breakElement = getOrDefineTarget(node); Map<String, LabelDefinition> continueLabels = <String, LabelDefinition>{}; Link<Node> cases = node.cases.nodes; CaseMatch firstCase = null; DartType firstCaseType = null; bool hasReportedProblem = false; for (Link<Node> cases = node.cases.nodes; !cases.isEmpty; cases = cases.tail) { SwitchCase switchCase = cases.head; for (Node labelOrCase in switchCase.labelsAndCases) { CaseMatch caseMatch = labelOrCase.asCaseMatch(); if (caseMatch == null) continue; // Analyze the constant. ConstantExpression constant = registry.getConstant(caseMatch.expression); assert(invariant(node, constant != null, message: 'No constant computed for $node')); DartType caseType = typeOfConstant(constant.value); if (firstCaseType == null) { firstCase = caseMatch; firstCaseType = caseType; // We only report the bad type on the first class element. All others // get a "type differs" error. if (caseType.element == compiler.doubleClass) { compiler.reportError(node, MessageKind.SWITCH_CASE_VALUE_OVERRIDES_EQUALS, {'type': "double"}); } else if (caseType.element == compiler.functionClass) { compiler.reportError(node, MessageKind.SWITCH_CASE_FORBIDDEN, {'type': "Function"}); } else if (constant.value.isObject && overridesEquals(caseType)) { compiler.reportError(firstCase.expression, MessageKind.SWITCH_CASE_VALUE_OVERRIDES_EQUALS, {'type': caseType}); } } else { if (caseType != firstCaseType) { if (!hasReportedProblem) { compiler.reportError( node, MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL, {'type': firstCaseType}); compiler.reportInfo( firstCase.expression, MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL_CASE, {'type': firstCaseType}); hasReportedProblem = true; } compiler.reportInfo( caseMatch.expression, MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL_CASE, {'type': caseType}); } } } } } visitSwitchStatement(SwitchStatement node) { node.expression.accept(this); JumpTarget breakElement = getOrDefineTarget(node); Map<String, LabelDefinition> continueLabels = <String, LabelDefinition>{}; Link<Node> cases = node.cases.nodes; while (!cases.isEmpty) { SwitchCase switchCase = cases.head; for (Node labelOrCase in switchCase.labelsAndCases) { CaseMatch caseMatch = labelOrCase.asCaseMatch(); if (caseMatch != null) { analyzeConstantDeferred(caseMatch.expression); continue; } Label label = labelOrCase; String labelName = label.labelName; LabelDefinition existingElement = continueLabels[labelName]; if (existingElement != null) { // It's an error if the same label occurs twice in the same switch. compiler.reportError( label, MessageKind.DUPLICATE_LABEL, {'labelName': labelName}); compiler.reportInfo( existingElement.label, MessageKind.EXISTING_LABEL, {'labelName': labelName}); } else { // It's only a warning if it shadows another label. existingElement = statementScope.lookupLabel(labelName); if (existingElement != null) { compiler.reportWarning( label, MessageKind.DUPLICATE_LABEL, {'labelName': labelName}); compiler.reportInfo( existingElement.label, MessageKind.EXISTING_LABEL, {'labelName': labelName}); } } JumpTarget targetElement = getOrDefineTarget(switchCase); LabelDefinition labelElement = targetElement.addLabel(label, labelName); registry.defineLabel(label, labelElement); continueLabels[labelName] = labelElement; } cases = cases.tail; // Test that only the last case, if any, is a default case. if (switchCase.defaultKeyword != null && !cases.isEmpty) { error(switchCase, MessageKind.INVALID_CASE_DEFAULT); } } addDeferredAction(enclosingElement, () { checkCaseExpressions(node); }); statementScope.enterSwitch(breakElement, continueLabels); node.cases.accept(this); statementScope.exitSwitch(); // Clean-up unused labels. continueLabels.forEach((String key, LabelDefinition label) { if (!label.isContinueTarget) { JumpTarget targetElement = label.target; SwitchCase switchCase = targetElement.statement; registry.undefineTarget(switchCase); registry.undefineLabel(label.label); } }); // TODO(15575): We should warn if we can detect a fall through // error. registry.registerFallThroughError(); } visitSwitchCase(SwitchCase node) { node.labelsAndCases.accept(this); visitIn(node.statements, new BlockScope(scope)); } visitCaseMatch(CaseMatch node) { visit(node.expression); } visitTryStatement(TryStatement node) { visit(node.tryBlock); if (node.catchBlocks.isEmpty && node.finallyBlock == null) { error(node.getEndToken().next, MessageKind.NO_CATCH_NOR_FINALLY); } visit(node.catchBlocks); visit(node.finallyBlock); } visitCatchBlock(CatchBlock node) { registry.registerCatchStatement(); // Check that if catch part is present, then // it has one or two formal parameters. VariableDefinitions exceptionDefinition; VariableDefinitions stackTraceDefinition; if (node.formals != null) { Link<Node> formalsToProcess = node.formals.nodes; if (formalsToProcess.isEmpty) { error(node, MessageKind.EMPTY_CATCH_DECLARATION); } else { exceptionDefinition = formalsToProcess.head.asVariableDefinitions(); formalsToProcess = formalsToProcess.tail; if (!formalsToProcess.isEmpty) { stackTraceDefinition = formalsToProcess.head.asVariableDefinitions(); formalsToProcess = formalsToProcess.tail; if (!formalsToProcess.isEmpty) { for (Node extra in formalsToProcess) { error(extra, MessageKind.EXTRA_CATCH_DECLARATION); } } registry.registerStackTraceInCatch(); } } // Check that the formals aren't optional and that they have no // modifiers or type. for (Link<Node> link = node.formals.nodes; !link.isEmpty; link = link.tail) { // If the formal parameter is a node list, it means that it is a // sequence of optional parameters. NodeList nodeList = link.head.asNodeList(); if (nodeList != null) { error(nodeList, MessageKind.OPTIONAL_PARAMETER_IN_CATCH); } else { VariableDefinitions declaration = link.head; for (Node modifier in declaration.modifiers.nodes) { error(modifier, MessageKind.PARAMETER_WITH_MODIFIER_IN_CATCH); } TypeAnnotation type = declaration.type; if (type != null) { error(type, MessageKind.PARAMETER_WITH_TYPE_IN_CATCH); } } } } Scope blockScope = new BlockScope(scope); doInCheckContext(() => visitIn(node.type, blockScope)); visitIn(node.formals, blockScope); var oldInCatchBlock = inCatchBlock; inCatchBlock = true; visitIn(node.block, blockScope); inCatchBlock = oldInCatchBlock; if (node.type != null && exceptionDefinition != null) { DartType exceptionType = registry.getType(node.type); Node exceptionVariable = exceptionDefinition.definitions.nodes.head; VariableElementX exceptionElement = registry.getDefinition(exceptionVariable); exceptionElement.variables.type = exceptionType; } if (stackTraceDefinition != null) { Node stackTraceVariable = stackTraceDefinition.definitions.nodes.head; VariableElementX stackTraceElement = registry.getDefinition(stackTraceVariable); registry.registerInstantiatedClass(compiler.stackTraceClass); stackTraceElement.variables.type = compiler.stackTraceClass.rawType; } } visitTypedef(Typedef node) { internalError(node, 'typedef'); } } class TypeDefinitionVisitor extends MappingVisitor<DartType> { Scope scope; final TypeDeclarationElement enclosingElement; TypeDeclarationElement get element => enclosingElement; TypeDefinitionVisitor(Compiler compiler, TypeDeclarationElement element, ResolutionRegistry registry) : this.enclosingElement = element, scope = Scope.buildEnclosingScope(element), super(compiler, registry); DartType get objectType => compiler.objectClass.rawType; void resolveTypeVariableBounds(NodeList node) { if (node == null) return; Setlet<String> nameSet = new Setlet<String>(); // Resolve the bounds of type variables. Iterator<DartType> types = element.typeVariables.iterator; Link<Node> nodeLink = node.nodes; while (!nodeLink.isEmpty) { types.moveNext(); TypeVariableType typeVariable = types.current; String typeName = typeVariable.name; TypeVariable typeNode = nodeLink.head; registry.useType(typeNode, typeVariable); if (nameSet.contains(typeName)) { error(typeNode, MessageKind.DUPLICATE_TYPE_VARIABLE_NAME, {'typeVariableName': typeName}); } nameSet.add(typeName); TypeVariableElementX variableElement = typeVariable.element; if (typeNode.bound != null) { DartType boundType = typeResolver.resolveTypeAnnotation( this, typeNode.bound); variableElement.boundCache = boundType; void checkTypeVariableBound() { Link<TypeVariableElement> seenTypeVariables = const Link<TypeVariableElement>(); seenTypeVariables = seenTypeVariables.prepend(variableElement); DartType bound = boundType; while (bound.isTypeVariable) { TypeVariableElement element = bound.element; if (seenTypeVariables.contains(element)) { if (identical(element, variableElement)) { // Only report an error on the checked type variable to avoid // generating multiple errors for the same cyclicity. warning(typeNode.name, MessageKind.CYCLIC_TYPE_VARIABLE, {'typeVariableName': variableElement.name}); } break; } seenTypeVariables = seenTypeVariables.prepend(element); bound = element.bound; } } addDeferredAction(element, checkTypeVariableBound); } else { variableElement.boundCache = objectType; } nodeLink = nodeLink.tail; } assert(!types.moveNext()); } } class TypedefResolverVisitor extends TypeDefinitionVisitor { TypedefElementX get element => enclosingElement; TypedefResolverVisitor(Compiler compiler, TypedefElement typedefElement, ResolutionRegistry registry) : super(compiler, typedefElement, registry); visitTypedef(Typedef node) { TypedefType type = element.computeType(compiler); scope = new TypeDeclarationScope(scope, element); resolveTypeVariableBounds(node.typeParameters); FunctionSignature signature = SignatureResolver.analyze( compiler, node.formals, node.returnType, element, registry, defaultValuesError: MessageKind.TYPEDEF_FORMAL_WITH_DEFAULT); element.functionSignature = signature; scope = new MethodScope(scope, element); signature.forEachParameter(addToScope); element.alias = signature.type; void checkCyclicReference() { element.checkCyclicReference(compiler); } addDeferredAction(element, checkCyclicReference); } } // TODO(johnniwinther): Replace with a traversal on the AST when the type // annotations in typedef alias are stored in a [TreeElements] mapping. class TypedefCyclicVisitor extends DartTypeVisitor { final Compiler compiler; final TypedefElementX element; bool hasCyclicReference = false; Link<TypedefElement> seenTypedefs = const Link<TypedefElement>(); int seenTypedefsCount = 0; Link<TypeVariableElement> seenTypeVariables = const Link<TypeVariableElement>(); TypedefCyclicVisitor(Compiler this.compiler, TypedefElement this.element); visitType(DartType type, _) { // Do nothing. } visitTypedefType(TypedefType type, _) { TypedefElementX typedefElement = type.element; if (seenTypedefs.contains(typedefElement)) { if (!hasCyclicReference && identical(element, typedefElement)) { // Only report an error on the checked typedef to avoid generating // multiple errors for the same cyclicity. hasCyclicReference = true; if (seenTypedefsCount == 1) { // Direct cyclicity. compiler.reportError(element, MessageKind.CYCLIC_TYPEDEF, {'typedefName': element.name}); } else if (seenTypedefsCount == 2) { // Cyclicity through one other typedef. compiler.reportError(element, MessageKind.CYCLIC_TYPEDEF_ONE, {'typedefName': element.name, 'otherTypedefName': seenTypedefs.head.name}); } else { // Cyclicity through more than one other typedef. for (TypedefElement cycle in seenTypedefs) { if (!identical(typedefElement, cycle)) { compiler.reportError(element, MessageKind.CYCLIC_TYPEDEF_ONE, {'typedefName': element.name, 'otherTypedefName': cycle.name}); } } } ErroneousElementX erroneousElement = new ErroneousElementX( MessageKind.CYCLIC_TYPEDEF, {'typedefName': element.name}, element.name, element); element.alias = new MalformedType(erroneousElement, typedefElement.alias); element.hasBeenCheckedForCycles = true; } } else { seenTypedefs = seenTypedefs.prepend(typedefElement); seenTypedefsCount++; type.visitChildren(this, null); typedefElement.alias.accept(this, null); seenTypedefs = seenTypedefs.tail; seenTypedefsCount--; } } visitFunctionType(FunctionType type, _) { type.visitChildren(this, null); } visitInterfaceType(InterfaceType type, _) { type.visitChildren(this, null); } visitTypeVariableType(TypeVariableType type, _) { TypeVariableElement typeVariableElement = type.element; if (seenTypeVariables.contains(typeVariableElement)) { // Avoid running in cycles on cyclic type variable bounds. // Cyclicity is reported elsewhere. return; } seenTypeVariables = seenTypeVariables.prepend(typeVariableElement); typeVariableElement.bound.accept(this, null); seenTypeVariables = seenTypeVariables.tail; } } /** * The implementation of [ResolverTask.resolveClass]. * * This visitor has to be extra careful as it is building the basic * element information, and cannot safely look at other elements as * this may lead to cycles. * * This visitor can assume that the supertypes have already been * resolved, but it cannot call [ResolverTask.resolveClass] directly * or indirectly (through [ClassElement.ensureResolved]) for any other * types. */ class ClassResolverVisitor extends TypeDefinitionVisitor { BaseClassElementX get element => enclosingElement; ClassResolverVisitor(Compiler compiler, ClassElement classElement, ResolutionRegistry registry) : super(compiler, classElement, registry); DartType visitClassNode(ClassNode node) { if (element == null) { throw compiler.internalError(node, 'element is null'); } if (element.resolutionState != STATE_STARTED) { throw compiler.internalError(element, 'cyclic resolution of class $element'); } InterfaceType type = element.computeType(compiler); scope = new TypeDeclarationScope(scope, element); // TODO(ahe): It is not safe to call resolveTypeVariableBounds yet. // As a side-effect, this may get us back here trying to // resolve this class again. resolveTypeVariableBounds(node.typeParameters); // Setup the supertype for the element (if there is a cycle in the // class hierarchy, it has already been set to Object). if (element.supertype == null && node.superclass != null) { MixinApplication superMixin = node.superclass.asMixinApplication(); if (superMixin != null) { DartType supertype = resolveSupertype(element, superMixin.superclass); Link<Node> link = superMixin.mixins.nodes; while (!link.isEmpty) { supertype = applyMixin(supertype, checkMixinType(link.head), link.head); link = link.tail; } element.supertype = supertype; } else { element.supertype = resolveSupertype(element, node.superclass); } } // If the super type isn't specified, we provide a default. The language // specifies [Object] but the backend can pick a specific 'implementation' // of Object - the JavaScript backend chooses between Object and // Interceptor. if (element.supertype == null) { ClassElement superElement = registry.defaultSuperclass(element); // Avoid making the superclass (usually Object) extend itself. if (element != superElement) { if (superElement == null) { compiler.internalError(node, "Cannot resolve default superclass for $element."); } else { superElement.ensureResolved(compiler); } element.supertype = superElement.computeType(compiler); } } if (element.interfaces == null) { element.interfaces = resolveInterfaces(node.interfaces, node.superclass); } else { assert(invariant(element, element.hasIncompleteHierarchy)); } calculateAllSupertypes(element); if (!element.hasConstructor) { Element superMember = element.superclass.localLookup(''); if (superMember == null || !superMember.isGenerativeConstructor) { MessageKind kind = MessageKind.CANNOT_FIND_CONSTRUCTOR; Map arguments = {'constructorName': ''}; // TODO(ahe): Why is this a compile-time error? Or if it is an error, // why do we bother to registerThrowNoSuchMethod below? compiler.reportError(node, kind, arguments); superMember = new ErroneousElementX( kind, arguments, '', element); registry.registerThrowNoSuchMethod(); } else { ConstructorElement superConstructor = superMember; Selector callToMatch = new Selector.call("", element.library, 0); superConstructor.computeSignature(compiler); if (!callToMatch.applies(superConstructor, compiler.world)) { MessageKind kind = MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT; compiler.reportError(node, kind); superMember = new ErroneousElementX(kind, {}, '', element); } } FunctionElement constructor = new SynthesizedConstructorElementX.forDefault(superMember, element); if (superMember.isErroneous) { compiler.elementsWithCompileTimeErrors.add(constructor); } element.setDefaultConstructor(constructor, compiler); } return element.computeType(compiler); } @override DartType visitEnum(Enum node) { if (element == null) { throw compiler.internalError(node, 'element is null'); } if (element.resolutionState != STATE_STARTED) { throw compiler.internalError(element, 'cyclic resolution of class $element'); } InterfaceType enumType = element.computeType(compiler); element.supertype = compiler.objectClass.computeType(compiler); element.interfaces = const Link<DartType>(); calculateAllSupertypes(element); if (node.names.nodes.isEmpty) { compiler.reportError(node, MessageKind.EMPTY_ENUM_DECLARATION, {'enumName': element.name}); } EnumCreator creator = new EnumCreator(compiler, element); creator.createMembers(); return enumType; } /// Resolves the mixed type for [mixinNode] and checks that the the mixin type /// is a valid, non-blacklisted interface type. The mixin type is returned. DartType checkMixinType(TypeAnnotation mixinNode) { DartType mixinType = resolveType(mixinNode); if (isBlackListed(mixinType)) { compiler.reportError(mixinNode, MessageKind.CANNOT_MIXIN, {'type': mixinType}); } else if (mixinType.isTypeVariable) { compiler.reportError(mixinNode, MessageKind.CLASS_NAME_EXPECTED); } else if (mixinType.isMalformed) { compiler.reportError(mixinNode, MessageKind.CANNOT_MIXIN_MALFORMED, {'className': element.name, 'malformedType': mixinType}); } else if (mixinType.isEnumType) { compiler.reportError(mixinNode, MessageKind.CANNOT_MIXIN_ENUM, {'className': element.name, 'enumType': mixinType}); } return mixinType; } DartType visitNamedMixinApplication(NamedMixinApplication node) { if (element == null) { throw compiler.internalError(node, 'element is null'); } if (element.resolutionState != STATE_STARTED) { throw compiler.internalError(element, 'cyclic resolution of class $element'); } if (identical(node.classKeyword.stringValue, 'typedef')) { // TODO(aprelev@gmail.com): Remove this deprecation diagnostic // together with corresponding TODO in parser.dart. compiler.reportWarning(node.classKeyword, MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX); } InterfaceType type = element.computeType(compiler); scope = new TypeDeclarationScope(scope, element); resolveTypeVariableBounds(node.typeParameters); // Generate anonymous mixin application elements for the // intermediate mixin applications (excluding the last). DartType supertype = resolveSupertype(element, node.superclass); Link<Node> link = node.mixins.nodes; while (!link.tail.isEmpty) { supertype = applyMixin(supertype, checkMixinType(link.head), link.head); link = link.tail; } doApplyMixinTo(element, supertype, checkMixinType(link.head)); return element.computeType(compiler); } DartType applyMixin(DartType supertype, DartType mixinType, Node node) { String superName = supertype.name; String mixinName = mixinType.name; MixinApplicationElementX mixinApplication = new MixinApplicationElementX( "${superName}+${mixinName}", element.compilationUnit, compiler.getNextFreeClassId(), node, new Modifiers.withFlags(new NodeList.empty(), Modifiers.FLAG_ABSTRACT)); // Create synthetic type variables for the mixin application. List<DartType> typeVariables = <DartType>[]; element.typeVariables.forEach((TypeVariableType type) { TypeVariableElementX typeVariableElement = new TypeVariableElementX( type.name, mixinApplication, type.element.node); TypeVariableType typeVariable = new TypeVariableType(typeVariableElement); typeVariables.add(typeVariable); }); // Setup bounds on the synthetic type variables. List<DartType> link = typeVariables; int index = 0; element.typeVariables.forEach((TypeVariableType type) { TypeVariableType typeVariable = typeVariables[index++]; TypeVariableElementX typeVariableElement = typeVariable.element; typeVariableElement.typeCache = typeVariable; typeVariableElement.boundCache = type.element.bound.subst(typeVariables, element.typeVariables); }); // Setup this and raw type for the mixin application. mixinApplication.computeThisAndRawType(compiler, typeVariables); // Substitute in synthetic type variables in super and mixin types. supertype = supertype.subst(typeVariables, element.typeVariables); mixinType = mixinType.subst(typeVariables, element.typeVariables); doApplyMixinTo(mixinApplication, supertype, mixinType); mixinApplication.resolutionState = STATE_DONE; mixinApplication.supertypeLoadState = STATE_DONE; // Replace the synthetic type variables by the original type variables in // the returned type (which should be the type actually extended). InterfaceType mixinThisType = mixinApplication.computeType(compiler); return mixinThisType.subst(element.typeVariables, mixinThisType.typeArguments); } bool isDefaultConstructor(FunctionElement constructor) { return constructor.name == '' && constructor.computeSignature(compiler).parameterCount == 0; } FunctionElement createForwardingConstructor(ConstructorElement target, ClassElement enclosing) { return new SynthesizedConstructorElementX( target.name, target, enclosing, false); } void doApplyMixinTo(MixinApplicationElementX mixinApplication, DartType supertype, DartType mixinType) { Node node = mixinApplication.parseNode(compiler); if (mixinApplication.supertype != null) { // [supertype] is not null if there was a cycle. assert(invariant(node, compiler.compilationFailed)); supertype = mixinApplication.supertype; assert(invariant(node, supertype.element == compiler.objectClass)); } else { mixinApplication.supertype = supertype; } // Named mixin application may have an 'implements' clause. NamedMixinApplication namedMixinApplication = node.asNamedMixinApplication(); Link<DartType> interfaces = (namedMixinApplication != null) ? resolveInterfaces(namedMixinApplication.interfaces, namedMixinApplication.superclass) : const Link<DartType>(); // The class that is the result of a mixin application implements // the interface of the class that was mixed in so always prepend // that to the interface list. if (mixinApplication.interfaces == null) { if (mixinType.isInterfaceType) { // Avoid malformed types in the interfaces. interfaces = interfaces.prepend(mixinType); } mixinApplication.interfaces = interfaces; } else { assert(invariant(mixinApplication, mixinApplication.hasIncompleteHierarchy)); } ClassElement superclass = supertype.element; if (mixinType.kind != TypeKind.INTERFACE) { mixinApplication.hasIncompleteHierarchy = true; mixinApplication.allSupertypesAndSelf = superclass.allSupertypesAndSelf; return; } assert(mixinApplication.mixinType == null); mixinApplication.mixinType = resolveMixinFor(mixinApplication, mixinType); // Create forwarding constructors for constructor defined in the superclass // because they are now hidden by the mixin application. superclass.forEachLocalMember((Element member) { if (!member.isGenerativeConstructor) return; FunctionElement forwarder = createForwardingConstructor(member, mixinApplication); if (isPrivateName(member.name) && mixinApplication.library != superclass.library) { // Do not create a forwarder to the super constructor, because the mixin // application is in a different library than the constructor in the // super class and it is not possible to call that constructor from the // library using the mixin application. return; } mixinApplication.addConstructor(forwarder); }); calculateAllSupertypes(mixinApplication); } InterfaceType resolveMixinFor(MixinApplicationElement mixinApplication, DartType mixinType) { ClassElement mixin = mixinType.element; mixin.ensureResolved(compiler); // Check for cycles in the mixin chain. ClassElement previous = mixinApplication; // For better error messages. ClassElement current = mixin; while (current != null && current.isMixinApplication) { MixinApplicationElement currentMixinApplication = current; if (currentMixinApplication == mixinApplication) { compiler.reportError( mixinApplication, MessageKind.ILLEGAL_MIXIN_CYCLE, {'mixinName1': current.name, 'mixinName2': previous.name}); // We have found a cycle in the mixin chain. Return null as // the mixin for this application to avoid getting into // infinite recursion when traversing members. return null; } previous = current; current = currentMixinApplication.mixin; } registry.registerMixinUse(mixinApplication, mixin); return mixinType; } DartType resolveType(TypeAnnotation node) { return typeResolver.resolveTypeAnnotation(this, node); } DartType resolveSupertype(ClassElement cls, TypeAnnotation superclass) { DartType supertype = resolveType(superclass); if (supertype != null) { if (supertype.isMalformed) { compiler.reportError(superclass, MessageKind.CANNOT_EXTEND_MALFORMED, {'className': element.name, 'malformedType': supertype}); return objectType; } else if (supertype.isEnumType) { compiler.reportError(superclass, MessageKind.CANNOT_EXTEND_ENUM, {'className': element.name, 'enumType': supertype}); return objectType; } else if (!supertype.isInterfaceType) { compiler.reportError(superclass.typeName, MessageKind.CLASS_NAME_EXPECTED); return objectType; } else if (isBlackListed(supertype)) { compiler.reportError(superclass, MessageKind.CANNOT_EXTEND, {'type': supertype}); return objectType; } } return supertype; } Link<DartType> resolveInterfaces(NodeList interfaces, Node superclass) { Link<DartType> result = const Link<DartType>(); if (interfaces == null) return result; for (Link<Node> link = interfaces.nodes; !link.isEmpty; link = link.tail) { DartType interfaceType = resolveType(link.head); if (interfaceType != null) { if (interfaceType.isMalformed) { compiler.reportError(superclass, MessageKind.CANNOT_IMPLEMENT_MALFORMED, {'className': element.name, 'malformedType': interfaceType}); } else if (interfaceType.isEnumType) { compiler.reportError(superclass, MessageKind.CANNOT_IMPLEMENT_ENUM, {'className': element.name, 'enumType': interfaceType}); } else if (!interfaceType.isInterfaceType) { // TODO(johnniwinther): Handle dynamic. TypeAnnotation typeAnnotation = link.head; error(typeAnnotation.typeName, MessageKind.CLASS_NAME_EXPECTED); } else { if (interfaceType == element.supertype) { compiler.reportError( superclass, MessageKind.DUPLICATE_EXTENDS_IMPLEMENTS, {'type': interfaceType}); compiler.reportError( link.head, MessageKind.DUPLICATE_EXTENDS_IMPLEMENTS, {'type': interfaceType}); } if (result.contains(interfaceType)) { compiler.reportError( link.head, MessageKind.DUPLICATE_IMPLEMENTS, {'type': interfaceType}); } result = result.prepend(interfaceType); if (isBlackListed(interfaceType)) { error(link.head, MessageKind.CANNOT_IMPLEMENT, {'type': interfaceType}); } } } } return result; } /** * Compute the list of all supertypes. * * The elements of this list are ordered as follows: first the supertype that * the class extends, then the implemented interfaces, and then the supertypes * of these. The class [Object] appears only once, at the end of the list. * * For example, for a class `class C extends S implements I1, I2`, we compute * supertypes(C) = [S, I1, I2] ++ supertypes(S) ++ supertypes(I1) * ++ supertypes(I2), * where ++ stands for list concatenation. * * This order makes sure that if a class implements an interface twice with * different type arguments, the type used in the most specific class comes * first. */ void calculateAllSupertypes(BaseClassElementX cls) { if (cls.allSupertypesAndSelf != null) return; final DartType supertype = cls.supertype; if (supertype != null) { OrderedTypeSetBuilder allSupertypes = new OrderedTypeSetBuilder(cls); // TODO(15296): Collapse these iterations to one when the order is not // needed. allSupertypes.add(compiler, supertype); for (Link<DartType> interfaces = cls.interfaces; !interfaces.isEmpty; interfaces = interfaces.tail) { allSupertypes.add(compiler, interfaces.head); } addAllSupertypes(allSupertypes, supertype); for (Link<DartType> interfaces = cls.interfaces; !interfaces.isEmpty; interfaces = interfaces.tail) { addAllSupertypes(allSupertypes, interfaces.head); } allSupertypes.add(compiler, cls.computeType(compiler)); cls.allSupertypesAndSelf = allSupertypes.toTypeSet(); } else { assert(identical(cls, compiler.objectClass)); cls.allSupertypesAndSelf = new OrderedTypeSet.singleton(cls.computeType(compiler)); } } /** * Adds [type] and all supertypes of [type] to [allSupertypes] while * substituting type variables. */ void addAllSupertypes(OrderedTypeSetBuilder allSupertypes, InterfaceType type) { ClassElement classElement = type.element; Link<DartType> supertypes = classElement.allSupertypes; assert(invariant(element, supertypes != null, message: "Supertypes not computed on $classElement " "during resolution of $element")); while (!supertypes.isEmpty) { DartType supertype = supertypes.head; allSupertypes.add(compiler, supertype.substByContext(type)); supertypes = supertypes.tail; } } isBlackListed(DartType type) { LibraryElement lib = element.library; return !identical(lib, compiler.coreLibrary) && !compiler.backend.isBackendLibrary(lib) && (type.isDynamic || identical(type.element, compiler.boolClass) || identical(type.element, compiler.numClass) || identical(type.element, compiler.intClass) || identical(type.element, compiler.doubleClass) || identical(type.element, compiler.stringClass) || identical(type.element, compiler.nullClass)); } } class ClassSupertypeResolver extends CommonResolverVisitor { Scope context; ClassElement classElement; ClassSupertypeResolver(Compiler compiler, ClassElement cls) : context = Scope.buildEnclosingScope(cls), this.classElement = cls, super(compiler); void loadSupertype(ClassElement element, Node from) { compiler.resolver.loadSupertypes(element, from); element.ensureResolved(compiler); } void visitNodeList(NodeList node) { if (node != null) { for (Link<Node> link = node.nodes; !link.isEmpty; link = link.tail) { link.head.accept(this); } } } void visitClassNode(ClassNode node) { if (node.superclass == null) { if (!identical(classElement, compiler.objectClass)) { loadSupertype(compiler.objectClass, node); } } else { node.superclass.accept(this); } visitNodeList(node.interfaces); } void visitEnum(Enum node) { loadSupertype(compiler.objectClass, node); } void visitMixinApplication(MixinApplication node) { node.superclass.accept(this); visitNodeList(node.mixins); } void visitNamedMixinApplication(NamedMixinApplication node) { node.superclass.accept(this); visitNodeList(node.mixins); visitNodeList(node.interfaces); } void visitTypeAnnotation(TypeAnnotation node) { node.typeName.accept(this); } void visitIdentifier(Identifier node) { Element element = lookupInScope(compiler, node, context, node.source); if (element != null && element.isClass) { loadSupertype(element, node); } } void visitSend(Send node) { Identifier prefix = node.receiver.asIdentifier(); if (prefix == null) { error(node.receiver, MessageKind.NOT_A_PREFIX, {'node': node.receiver}); return; } Element element = lookupInScope(compiler, prefix, context, prefix.source); if (element == null || !identical(element.kind, ElementKind.PREFIX)) { error(node.receiver, MessageKind.NOT_A_PREFIX, {'node': node.receiver}); return; } PrefixElement prefixElement = element; Identifier selector = node.selector.asIdentifier(); var e = prefixElement.lookupLocalMember(selector.source); if (e == null || !e.impliesType) { error(node.selector, MessageKind.CANNOT_RESOLVE_TYPE, {'typeName': node.selector}); return; } loadSupertype(e, node); } } class VariableDefinitionsVisitor extends CommonResolverVisitor<Identifier> { VariableDefinitions definitions; ResolverVisitor resolver; VariableList variables; VariableDefinitionsVisitor(Compiler compiler, this.definitions, this.resolver, this.variables) : super(compiler) { } ResolutionRegistry get registry => resolver.registry; Identifier visitSendSet(SendSet node) { assert(node.arguments.tail.isEmpty); // Sanity check Identifier identifier = node.selector; String name = identifier.source; VariableDefinitionScope scope = new VariableDefinitionScope(resolver.scope, name); resolver.visitIn(node.arguments.head, scope); if (scope.variableReferencedInInitializer) { compiler.reportError( identifier, MessageKind.REFERENCE_IN_INITIALIZATION, {'variableName': name}); } return identifier; } Identifier visitIdentifier(Identifier node) { // The variable is initialized to null. registry.registerInstantiatedClass(compiler.nullClass); if (definitions.modifiers.isConst) { compiler.reportError(node, MessageKind.CONST_WITHOUT_INITIALIZER); } if (definitions.modifiers.isFinal && !resolver.allowFinalWithoutInitializer) { compiler.reportError(node, MessageKind.FINAL_WITHOUT_INITIALIZER); } return node; } visitNodeList(NodeList node) { for (Link<Node> link = node.nodes; !link.isEmpty; link = link.tail) { Identifier name = visit(link.head); LocalVariableElement element = new LocalVariableElementX( name.source, resolver.enclosingElement, variables, name.token); resolver.defineLocalVariable(link.head, element); resolver.addToScope(element); if (definitions.modifiers.isConst) { compiler.enqueuer.resolution.addDeferredAction(element, () { compiler.resolver.constantCompiler.compileConstant(element); }); } } } } class ConstructorResolver extends CommonResolverVisitor<Element> { final ResolverVisitor resolver; bool inConstContext; DartType type; ConstructorResolver(Compiler compiler, this.resolver, {bool this.inConstContext: false}) : super(compiler); ResolutionRegistry get registry => resolver.registry; visitNode(Node node) { throw 'not supported'; } ErroneousConstructorElementX failOrReturnErroneousConstructorElement( Spannable diagnosticNode, Element enclosing, String name, MessageKind kind, Map arguments, {bool isError: false, bool missingConstructor: false}) { if (missingConstructor) { registry.registerThrowNoSuchMethod(); } else { registry.registerThrowRuntimeError(); } if (isError || inConstContext) { compiler.reportError(diagnosticNode, kind, arguments); } else { compiler.reportWarning(diagnosticNode, kind, arguments); } return new ErroneousConstructorElementX( kind, arguments, name, enclosing); } FunctionElement resolveConstructor(ClassElement cls, Node diagnosticNode, String constructorName) { cls.ensureResolved(compiler); Element result = cls.lookupConstructor(constructorName); // TODO(johnniwinther): Use [Name] for lookup. if (isPrivateName(constructorName) && resolver.enclosingElement.library != cls.library) { result = null; } if (result == null) { String fullConstructorName = Elements.constructorNameForDiagnostics( cls.name, constructorName); return failOrReturnErroneousConstructorElement( diagnosticNode, cls, constructorName, MessageKind.CANNOT_FIND_CONSTRUCTOR, {'constructorName': fullConstructorName}, missingConstructor: true); } else if (inConstContext && !result.isConst) { error(diagnosticNode, MessageKind.CONSTRUCTOR_IS_NOT_CONST); } return result; } Element visitNewExpression(NewExpression node) { inConstContext = node.isConst; Node selector = node.send.selector; Element element = visit(selector); assert(invariant(selector, element != null, message: 'No element return for $selector.')); return finishConstructorReference(element, node.send.selector, node); } /// Finishes resolution of a constructor reference and records the /// type of the constructed instance on [expression]. FunctionElement finishConstructorReference(Element element, Node diagnosticNode, Node expression) { assert(invariant(diagnosticNode, element != null, message: 'No element return for $diagnosticNode.')); // Find the unnamed constructor if the reference resolved to a // class. if (!Elements.isUnresolved(element) && !element.isConstructor) { if (element.isClass) { ClassElement cls = element; cls.ensureResolved(compiler); // The unnamed constructor may not exist, so [e] may become unresolved. element = resolveConstructor(cls, diagnosticNode, ''); } else { element = failOrReturnErroneousConstructorElement( diagnosticNode, element, element.name, MessageKind.NOT_A_TYPE, {'node': diagnosticNode}); } } else if (element.isErroneous && element is! ErroneousElementX) { // Parser error. The error has already been reported. element = new ErroneousConstructorElementX( MessageKind.NOT_A_TYPE, {'node': diagnosticNode}, element.name, element); registry.registerThrowRuntimeError(); } if (type == null) { if (Elements.isUnresolved(element)) { type = const DynamicType(); } else { type = element.enclosingClass.rawType; } } resolver.registry.setType(expression, type); return element; } Element visitTypeAnnotation(TypeAnnotation node) { assert(invariant(node, type == null)); // This is not really resolving a type-annotation, but the name of the // constructor. Therefore we allow deferred types. type = resolver.resolveTypeAnnotation(node, malformedIsError: inConstContext, deferredIsMalformed: false); registry.registerRequiredType(type, resolver.enclosingElement); return type.element; } Element visitSend(Send node) { Element element = visit(node.receiver); assert(invariant(node.receiver, element != null, message: 'No element return for $node.receiver.')); if (Elements.isUnresolved(element)) return element; Identifier name = node.selector.asIdentifier(); if (name == null) internalError(node.selector, 'unexpected node'); if (element.isClass) { ClassElement cls = element; cls.ensureResolved(compiler); return resolveConstructor(cls, name, name.source); } else if (element.isPrefix) { PrefixElement prefix = element; element = prefix.lookupLocalMember(name.source); element = Elements.unwrap(element, compiler, node); if (element == null) { return failOrReturnErroneousConstructorElement( name, resolver.enclosingElement, name.source, MessageKind.CANNOT_RESOLVE, {'name': name}); } else if (!element.isClass) { return failOrReturnErroneousConstructorElement( name, resolver.enclosingElement, name.source, MessageKind.NOT_A_TYPE, {'node': name}, isError: true); } } else { internalError(node.receiver, 'unexpected element $element'); } return element; } Element visitIdentifier(Identifier node) { String name = node.source; Element element = resolver.reportLookupErrorIfAny( lookupInScope(compiler, node, resolver.scope, name), node, name); registry.useElement(node, element); // TODO(johnniwinther): Change errors to warnings, cf. 11.11.1. if (element == null) { return failOrReturnErroneousConstructorElement( node, resolver.enclosingElement, name, MessageKind.CANNOT_RESOLVE, {'name': name}); } else if (element.isErroneous) { return element; } else if (element.isTypedef) { element = failOrReturnErroneousConstructorElement( node, resolver.enclosingElement, name, MessageKind.CANNOT_INSTANTIATE_TYPEDEF, {'typedefName': name}, isError: true); } else if (element.isTypeVariable) { element = failOrReturnErroneousConstructorElement( node, resolver.enclosingElement, name, MessageKind.CANNOT_INSTANTIATE_TYPE_VARIABLE, {'typeVariableName': name}, isError: true); } else if (!element.isClass && !element.isPrefix) { element = failOrReturnErroneousConstructorElement( node, resolver.enclosingElement, name, MessageKind.NOT_A_TYPE, {'node': name}, isError: true); } return element; } /// Assumed to be called by [resolveRedirectingFactory]. Element visitRedirectingFactoryBody(RedirectingFactoryBody node) { Node constructorReference = node.constructorReference; return finishConstructorReference(visit(constructorReference), constructorReference, node); } } /// Looks up [name] in [scope] and unwraps the result. Element lookupInScope(Compiler compiler, Node node, Scope scope, String name) { return Elements.unwrap(scope.lookup(name), compiler, node); } TreeElements _ensureTreeElements(AnalyzableElementX element) { if (element._treeElements == null) { element._treeElements = new TreeElementMapping(element); } return element._treeElements; } abstract class AnalyzableElementX implements AnalyzableElement { TreeElements _treeElements; bool get hasTreeElements => _treeElements != null; TreeElements get treeElements { assert(invariant(this, _treeElements !=null, message: "TreeElements have not been computed for $this.")); return _treeElements; } void reuseElement() { _treeElements = null; } } /// The result of resolving a node. abstract class ResolutionResult { Element get element; } /// The result for the resolution of a node that points to an [Element]. class ElementResult implements ResolutionResult { final Element element; // TODO(johnniwinther): Remove this factory constructor when `null` is never // passed as an element result. factory ElementResult(Element element) { return element != null ? new ElementResult.internal(element) : null; } ElementResult.internal(this.element); String toString() => 'ElementResult($element)'; } /// The result for the resolution of a node that points to an [DartType]. class TypeResult implements ResolutionResult { final DartType type; TypeResult(this.type) { assert(type != null); } Element get element => type.element; String toString() => 'TypeResult($type)'; } /// The result for the resolution of the `assert` method. class AssertResult implements ResolutionResult { const AssertResult(); Element get element => null; String toString() => 'AssertResult()'; }