Linter Demo

Errors: 52

Warnings: 43

File: /home/fstrocco/Dart/dart/benchmark/compiler/lib/src/inferrer/type_graph_inferrer.dart

// Copyright (c) 2013, 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. library type_graph_inferrer; import 'dart:collection' show Queue, IterableBase; /*@@@EXTENSION import modelx for element types*/ import '../elements/modelx.dart'; import '../types/types.dart'; import '../scanner/scannerlib.dart'; /*@@@END EXTENSION*/ import '../constants/expressions.dart'; import '../constants/values.dart'; import '../cps_ir/cps_ir_nodes.dart' as cps_ir show Node; import '../dart_types.dart' show DartType, FunctionType, InterfaceType, TypeKind; import '../dart2jslib.dart' show ClassWorld, Compiler, Constant, FunctionConstant, invariant, TreeElementMapping; import '../elements/elements.dart'; import '../native/native.dart' as native; import '../tree/tree.dart' as ast show DartString, Node, TryStatement; import '../types/types.dart' show ContainerTypeMask, DictionaryTypeMask, MapTypeMask, TypeMask, TypesInferrer, ValueTypeMask; import '../types/constants.dart' show computeTypeMask; import '../universe/universe.dart' show Selector, SideEffects, TypedSelector; import '../util/util.dart' show ImmutableEmptySet, Setlet, Spannable; import '../js_backend/js_backend.dart' show Annotations, JavaScriptBackend; import 'inferrer_visitor.dart' show ArgumentsTypes, TypeSystem; import 'simple_types_inferrer.dart'; part 'closure_tracer.dart'; part 'list_tracer.dart'; part 'map_tracer.dart'; part 'node_tracer.dart'; part 'type_graph_nodes.dart'; bool _VERBOSE = false; bool _PRINT_SUMMARY = false; final _ANOMALY_WARN = false; class TypeInformationSystem extends TypeSystem<TypeInformation> { final Compiler compiler; final ClassWorld classWorld; /// [ElementTypeInformation]s for elements. final Map<Element, TypeInformation> typeInformations = new Map<Element, TypeInformation>(); /// [ListTypeInformation] for allocated lists. final Map<ast.Node, TypeInformation> allocatedLists = new Map<ast.Node, TypeInformation>(); /// [MapTypeInformation] for allocated Maps. final Map<ast.Node, TypeInformation> allocatedMaps = new Map<ast.Node, TypeInformation>(); /// Closures found during the analysis. final Set<TypeInformation> allocatedClosures = new Set<TypeInformation>(); /// Cache of [ConcreteTypeInformation]. final Map<TypeMask, TypeInformation> concreteTypes = new Map<TypeMask, TypeInformation>(); /// List of [TypeInformation]s allocated inside method bodies (calls, /// narrowing, phis, and containers). final List<TypeInformation> allocatedTypes = <TypeInformation>[]; TypeInformationSystem(Compiler compiler) : this.compiler = compiler, this.classWorld = compiler.world { nonNullEmptyType = getConcreteTypeFor(const TypeMask.nonNullEmpty()); } /// Used to group [TypeInformation] nodes by the element that triggered their /// creation. MemberTypeInformation _currentMember = null; MemberTypeInformation get currentMember => _currentMember; void withMember(MemberElement element, action) { assert(invariant(element, _currentMember == null, message: "Already constructing graph for $_currentMember.")); _currentMember = getInferredTypeOf(element); action(); _currentMember = null; } TypeInformation nullTypeCache; TypeInformation get nullType { if (nullTypeCache != null) return nullTypeCache; return nullTypeCache = getConcreteTypeFor(compiler.typesTask.nullType); } TypeInformation intTypeCache; TypeInformation get intType { if (intTypeCache != null) return intTypeCache; return intTypeCache = getConcreteTypeFor(compiler.typesTask.intType); } TypeInformation uint32TypeCache; TypeInformation get uint32Type { if (uint32TypeCache != null) return uint32TypeCache; return uint32TypeCache = getConcreteTypeFor(compiler.typesTask.uint32Type); } TypeInformation uint31TypeCache; TypeInformation get uint31Type { if (uint31TypeCache != null) return uint31TypeCache; return uint31TypeCache = getConcreteTypeFor(compiler.typesTask.uint31Type); } TypeInformation positiveIntTypeCache; TypeInformation get positiveIntType { if (positiveIntTypeCache != null) return positiveIntTypeCache; return positiveIntTypeCache = getConcreteTypeFor(compiler.typesTask.positiveIntType); } TypeInformation doubleTypeCache; TypeInformation get doubleType { if (doubleTypeCache != null) return doubleTypeCache; return doubleTypeCache = getConcreteTypeFor(compiler.typesTask.doubleType); } TypeInformation numTypeCache; TypeInformation get numType { if (numTypeCache != null) return numTypeCache; return numTypeCache = getConcreteTypeFor(compiler.typesTask.numType); } TypeInformation boolTypeCache; TypeInformation get boolType { if (boolTypeCache != null) return boolTypeCache; return boolTypeCache = getConcreteTypeFor(compiler.typesTask.boolType); } TypeInformation functionTypeCache; TypeInformation get functionType { if (functionTypeCache != null) return functionTypeCache; return functionTypeCache = getConcreteTypeFor(compiler.typesTask.functionType); } TypeInformation listTypeCache; TypeInformation get listType { if (listTypeCache != null) return listTypeCache; return listTypeCache = getConcreteTypeFor(compiler.typesTask.listType); } TypeInformation constListTypeCache; TypeInformation get constListType { if (constListTypeCache != null) return constListTypeCache; return constListTypeCache = getConcreteTypeFor(compiler.typesTask.constListType); } TypeInformation fixedListTypeCache; TypeInformation get fixedListType { if (fixedListTypeCache != null) return fixedListTypeCache; return fixedListTypeCache = getConcreteTypeFor(compiler.typesTask.fixedListType); } TypeInformation growableListTypeCache; TypeInformation get growableListType { if (growableListTypeCache != null) return growableListTypeCache; return growableListTypeCache = getConcreteTypeFor(compiler.typesTask.growableListType); } TypeInformation mapTypeCache; TypeInformation get mapType { if (mapTypeCache != null) return mapTypeCache; return mapTypeCache = getConcreteTypeFor(compiler.typesTask.mapType); } TypeInformation constMapTypeCache; TypeInformation get constMapType { if (constMapTypeCache != null) return constMapTypeCache; return constMapTypeCache = getConcreteTypeFor(compiler.typesTask.constMapType); } TypeInformation stringTypeCache; TypeInformation get stringType { if (stringTypeCache != null) return stringTypeCache; return stringTypeCache = getConcreteTypeFor(compiler.typesTask.stringType); } TypeInformation typeTypeCache; TypeInformation get typeType { if (typeTypeCache != null) return typeTypeCache; return typeTypeCache = getConcreteTypeFor(compiler.typesTask.typeType); } TypeInformation dynamicTypeCache; TypeInformation get dynamicType { if (dynamicTypeCache != null) return dynamicTypeCache; return dynamicTypeCache = getConcreteTypeFor(compiler.typesTask.dynamicType); } TypeInformation nonNullEmptyType; TypeInformation stringLiteralType(ast.DartString value) { return new StringLiteralTypeInformation( value, compiler.typesTask.stringType); } TypeInformation computeLUB(TypeInformation firstType, TypeInformation secondType) { if (firstType == null) return secondType; if (firstType == secondType) return firstType; if (firstType == nonNullEmptyType) return secondType; if (secondType == nonNullEmptyType) return firstType; if (firstType == dynamicType || secondType == dynamicType) { return dynamicType; } return getConcreteTypeFor( firstType.type.union(secondType.type, classWorld)); } bool selectorNeedsUpdate(TypeInformation info, Selector selector) { return info.type != selector.mask; } TypeInformation refineReceiver(Selector selector, TypeInformation receiver) { if (receiver.type.isExact) return receiver; TypeMask otherType = compiler.world.allFunctions.receiverType(selector); // If this is refining to nullable subtype of `Object` just return // the receiver. We know the narrowing is useless. if (otherType.isNullable && otherType.containsAll(classWorld)) { return receiver; } assert(TypeMask.assertIsNormalized(otherType, classWorld)); TypeInformation newType = new NarrowTypeInformation(receiver, otherType); allocatedTypes.add(newType); return newType; } TypeInformation narrowType(TypeInformation type, DartType annotation, {bool isNullable: true}) { if (annotation.treatAsDynamic) return type; if (annotation.isVoid) return nullType; if (annotation.element == classWorld.objectClass && isNullable) return type; TypeMask otherType; if (annotation.isTypedef || annotation.isFunctionType) { otherType = functionType.type; } else if (annotation.isTypeVariable) { // TODO(ngeoffray): Narrow to bound. return type; } else { assert(annotation.isInterfaceType); otherType = annotation.element == classWorld.objectClass ? dynamicType.type.nonNullable() : new TypeMask.nonNullSubtype(annotation.element, classWorld); } if (isNullable) otherType = otherType.nullable(); if (type.type.isExact) { return type; } else { assert(TypeMask.assertIsNormalized(otherType, classWorld)); TypeInformation newType = new NarrowTypeInformation(type, otherType); allocatedTypes.add(newType); return newType; } } ElementTypeInformation getInferredTypeOf(Element element) { element = element.implementation; return typeInformations.putIfAbsent(element, () { return new ElementTypeInformation(element, this); }); } ConcreteTypeInformation getConcreteTypeFor(TypeMask mask) { assert(mask != null); return concreteTypes.putIfAbsent(mask, () { return new ConcreteTypeInformation(mask); }); } String getInferredSignatureOf(FunctionElement function) { ElementTypeInformation info = getInferredTypeOf(function); FunctionElement impl = function.implementation; FunctionSignature signature = impl.functionSignature; var res = ""; signature.forEachParameter((Element parameter) { TypeInformation type = getInferredTypeOf(parameter); res += "${res.isEmpty ? '(' : ', '}${type.type} ${parameter.name}"; }); res += ") -> ${info.type}"; return res; } TypeInformation nonNullSubtype(ClassElement type) { return getConcreteTypeFor( new TypeMask.nonNullSubtype(type.declaration, classWorld)); } TypeInformation nonNullSubclass(ClassElement type) { return getConcreteTypeFor( new TypeMask.nonNullSubclass(type.declaration, classWorld)); } TypeInformation nonNullExact(ClassElement type) { return getConcreteTypeFor( new TypeMask.nonNullExact(type.declaration, classWorld)); } TypeInformation nonNullEmpty() { return nonNullEmptyType; } bool isNull(TypeInformation type) { return type == nullType; } TypeInformation allocateList(TypeInformation type, ast.Node node, Element enclosing, [TypeInformation elementType, int length]) { bool isTypedArray = compiler.typedDataClass != null && classWorld.isInstantiated(compiler.typedDataClass) && type.type.satisfies(compiler.typedDataClass, classWorld); bool isConst = (type.type == compiler.typesTask.constListType); bool isFixed = (type.type == compiler.typesTask.fixedListType) || isConst || isTypedArray; bool isElementInferred = isConst || isTypedArray; int inferredLength = isFixed ? length : null; TypeMask elementTypeMask = isElementInferred ? elementType.type : dynamicType.type; ContainerTypeMask mask = new ContainerTypeMask( type.type, node, enclosing, elementTypeMask, inferredLength); ElementInContainerTypeInformation element = new ElementInContainerTypeInformation(currentMember, elementType); element.inferred = isElementInferred; allocatedTypes.add(element); return allocatedLists[node] = new ListTypeInformation(currentMember, mask, element, length); } TypeInformation allocateClosure(ast.Node node, Element element) { TypeInformation result = new ClosureTypeInformation(currentMember, node, element); allocatedClosures.add(result); return result; } TypeInformation allocateMap(ConcreteTypeInformation type, ast.Node node, Element element, [List<TypeInformation> keyTypes, List<TypeInformation> valueTypes]) { assert(keyTypes.length == valueTypes.length); bool isFixed = (type.type == compiler.typesTask.constMapType); TypeMask keyType, valueType; if (isFixed) { keyType = keyTypes.fold(nonNullEmptyType.type, (type, info) => type.union(info.type, classWorld)); valueType = valueTypes.fold(nonNullEmptyType.type, (type, info) => type.union(info.type, classWorld)); } else { keyType = valueType = dynamicType.type; } MapTypeMask mask = new MapTypeMask(type.type, node, element, keyType, valueType); TypeInformation keyTypeInfo = new KeyInMapTypeInformation(currentMember, null); TypeInformation valueTypeInfo = new ValueInMapTypeInformation(currentMember, null); allocatedTypes.add(keyTypeInfo); allocatedTypes.add(valueTypeInfo); MapTypeInformation map = new MapTypeInformation(currentMember, mask, keyTypeInfo, valueTypeInfo); for (int i = 0; i < keyTypes.length; ++i) { TypeInformation newType = map.addEntryAssignment(keyTypes[i], valueTypes[i], true); if (newType != null) allocatedTypes.add(newType); } // Shortcut: If we already have a first approximation of the key/value type, // start propagating it early. if (isFixed) map.markAsInferred(); allocatedMaps[node] = map; return map; } Selector newTypedSelector(TypeInformation info, Selector selector) { // Only type the selector if [info] is concrete, because the other // kinds of [TypeInformation] have the empty type at this point of // analysis. return info.isConcrete ? new TypedSelector(info.type, selector, classWorld) : selector; } TypeInformation allocateDiamondPhi(TypeInformation firstInput, TypeInformation secondInput) { PhiElementTypeInformation result = new PhiElementTypeInformation(currentMember, null, false, null); result.addAssignment(firstInput); result.addAssignment(secondInput); allocatedTypes.add(result); return result; } PhiElementTypeInformation _addPhi(ast.Node node, Local variable, inputType, bool isLoop) { PhiElementTypeInformation result = new PhiElementTypeInformation(currentMember, node, isLoop, variable); allocatedTypes.add(result); result.addAssignment(inputType); return result; } PhiElementTypeInformation allocatePhi(ast.Node node, Local variable, inputType) { // Check if [inputType] is a phi for a local updated in // the try/catch block [node]. If it is, no need to allocate a new // phi. if (inputType is PhiElementTypeInformation && inputType.branchNode == node && inputType.branchNode is ast.TryStatement) { return inputType; } return _addPhi(node, variable, inputType, false); } PhiElementTypeInformation allocateLoopPhi(ast.Node node, Local variable, inputType) { return _addPhi(node, variable, inputType, true); } TypeInformation simplifyPhi(ast.Node node, Local variable, PhiElementTypeInformation phiType) { assert(phiType.branchNode == node); if (phiType.assignments.length == 1) return phiType.assignments.first; return phiType; } PhiElementTypeInformation addPhiInput(Local variable, PhiElementTypeInformation phiType, TypeInformation newType) { phiType.addAssignment(newType); return phiType; } TypeMask computeTypeMask(Iterable<TypeInformation> assignments) { return joinTypeMasks(assignments.map((e) => e.type)); } TypeMask joinTypeMasks(Iterable<TypeMask> masks) { TypeMask newType = const TypeMask.nonNullEmpty(); for (TypeMask mask in masks) { newType = newType.union(mask, classWorld); } return newType.containsAll(classWorld) ? dynamicType.type : newType; } } /** * A work queue for the inferrer. It filters out nodes that are tagged as * [TypeInformation.doNotEnqueue], as well as ensures through * [TypeInformation.inQueue] that a node is in the queue only once at * a time. */ class WorkQueue { final Queue<TypeInformation> queue = new Queue<TypeInformation>(); void add(TypeInformation element) { if (element.doNotEnqueue) return; if (element.inQueue) return; queue.addLast(element); element.inQueue = true; } void addAll(Iterable<TypeInformation> all) { all.forEach(add); } TypeInformation remove() { TypeInformation element = queue.removeFirst(); element.inQueue = false; return element; } bool get isEmpty => queue.isEmpty; int get length => queue.length; } /** * An inferencing engine that computes a call graph of * [TypeInformation] nodes by visiting the AST of the application, and * then does the inferencing on the graph. * */ class TypeGraphInferrerEngine extends InferrerEngine<TypeInformation, TypeInformationSystem> { final Map<Element, TypeInformation> defaultTypeOfParameter = new Map<Element, TypeInformation>(); final List<CallSiteTypeInformation> allocatedCalls = <CallSiteTypeInformation>[]; final WorkQueue workQueue = new WorkQueue(); final Element mainElement; final Set<Element> analyzedElements = new Set<Element>(); /// The maximum number of times we allow a node in the graph to /// change types. If a node reaches that limit, we give up /// inferencing on it and give it the dynamic type. final int MAX_CHANGE_COUNT = 6; int overallRefineCount = 0; int addedInGraph = 0; TypeGraphInferrerEngine(Compiler compiler, this.mainElement) : super(compiler, new TypeInformationSystem(compiler)); JavaScriptBackend get backend => compiler.backend; Annotations get annotations => backend.annotations; /** * A set of selector names that [List] implements, that we know return * their element type. */ final Set<Selector> _returnsListElementTypeSet = new Set<Selector>.from( <Selector>[ new Selector.getter('first', null), new Selector.getter('last', null), new Selector.getter('single', null), new Selector.call('singleWhere', null, 1), new Selector.call('elementAt', null, 1), new Selector.index(), new Selector.call('removeAt', null, 1), new Selector.call('removeLast', null, 0) ]); bool returnsListElementType(Selector selector) { return (selector.mask != null) && selector.mask.isContainer && _returnsListElementTypeSet.contains(selector.asUntyped); } bool returnsMapValueType(Selector selector) { return (selector.mask != null) && selector.mask.isMap && selector.isIndex; } void analyzeListAndEnqueue(ListTypeInformation info) { if (info.analyzed) return; info.analyzed = true; ListTracerVisitor tracer = new ListTracerVisitor(info, this); bool succeeded = tracer.run(); if (!succeeded) return; info.bailedOut = false; info.elementType.inferred = true; TypeMask fixedListType = compiler.typesTask.fixedListType; if (info.originalType.forwardTo == fixedListType) { info.checksGrowable = tracer.callsGrowableMethod; } tracer.assignments.forEach(info.elementType.addAssignment); // Enqueue the list for later refinement workQueue.add(info); workQueue.add(info.elementType); } void analyzeMapAndEnqueue(MapTypeInformation info) { if (info.analyzed) return; info.analyzed = true; MapTracerVisitor tracer = new MapTracerVisitor(info, this); bool succeeded = tracer.run(); if (!succeeded) return; info.bailedOut = false; for (int i = 0; i < tracer.keyAssignments.length; ++i) { TypeInformation newType = info.addEntryAssignment( tracer.keyAssignments[i], tracer.valueAssignments[i]); if (newType != null) workQueue.add(newType); } for (TypeInformation map in tracer.mapAssignments) { workQueue.addAll(info.addMapAssignment(map)); } info.markAsInferred(); workQueue.add(info.keyType); workQueue.add(info.valueType); workQueue.addAll(info.typeInfoMap.values); workQueue.add(info); } void runOverAllElements() { if (compiler.disableTypeInference) return; if (compiler.verbose) { compiler.progress.reset(); } sortResolvedElements().forEach((Element element) { if (compiler.shouldPrintProgress) { compiler.log('Added $addedInGraph elements in inferencing graph.'); compiler.progress.reset(); } // This also forces the creation of the [ElementTypeInformation] to ensure // it is in the graph. types.withMember(element, () => analyze(element, null)); }); compiler.log('Added $addedInGraph elements in inferencing graph.'); buildWorkQueue(); refine(); // Try to infer element types of lists and compute their escape information. types.allocatedLists.values.forEach((ListTypeInformation info) { analyzeListAndEnqueue(info); }); // Try to infer the key and value types for maps and compute the values' // escape information. types.allocatedMaps.values.forEach((MapTypeInformation info) { analyzeMapAndEnqueue(info); }); Set<FunctionElement> bailedOutOn = new Set<FunctionElement>(); // Trace closures to potentially infer argument types. types.allocatedClosures.forEach((info) { void trace(Iterable<FunctionElement> elements, ClosureTracerVisitor tracer) { tracer.run(); if (!tracer.continueAnalyzing) { elements.forEach((FunctionElement e) { compiler.world.registerMightBePassedToApply(e); if (_VERBOSE) print("traced closure $e as ${true} (bail)"); e.functionSignature.forEachParameter((parameter) { types.getInferredTypeOf(parameter).giveUp( this, clearAssignments: false); }); }); bailedOutOn.addAll(elements); return; } elements .where((e) => !bailedOutOn.contains(e)) .forEach((FunctionElement e) { e.functionSignature.forEachParameter((parameter) { var info = types.getInferredTypeOf(parameter); info.maybeResume(); workQueue.add(info); }); if (tracer.tracedType.mightBePassedToFunctionApply) { compiler.world.registerMightBePassedToApply(e); }; if (_VERBOSE) { print("traced closure $e as " "${compiler.world.getMightBePassedToApply(e)}"); } }); } if (info is ClosureTypeInformation) { Iterable<FunctionElement> elements = [info.element]; trace(elements, new ClosureTracerVisitor(elements, info, this)); } else if (info is CallSiteTypeInformation) { // We only are interested in functions here, as other targets // of this closure call are not a root to trace but an intermediate // for some other function. Iterable<FunctionElement> elements = info.callees .where((e) => e.isFunction); trace(elements, new ClosureTracerVisitor(elements, info, this)); } else { assert(info is ElementTypeInformation); trace([info.element], new StaticTearOffClosureTracerVisitor(info.element, info, this)); } }); // Reset all nodes that use lists/maps that have been inferred, as well // as nodes that use elements fetched from these lists/maps. The // workset for a new run of the analysis will be these nodes. Set<TypeInformation> seenTypes = new Set<TypeInformation>(); while (!workQueue.isEmpty) { TypeInformation info = workQueue.remove(); if (seenTypes.contains(info)) continue; // If the node cannot be reset, we do not need to update its users either. if (!info.reset(this)) continue; seenTypes.add(info); workQueue.addAll(info.users); } workQueue.addAll(seenTypes); refine(); if (_PRINT_SUMMARY) { types.allocatedLists.values.forEach((ListTypeInformation info) { print('${info.type} ' 'for ${info.originalType.allocationNode} ' 'at ${info.originalType.allocationElement} ' 'after ${info.refineCount}'); }); types.allocatedMaps.values.forEach((MapTypeInformation info) { print('${info.type} ' 'for ${info.originalType.allocationNode} ' 'at ${info.originalType.allocationElement} ' 'after ${info.refineCount}'); }); types.allocatedClosures.forEach((TypeInformation info) { if (info is ElementTypeInformation) { print('${types.getInferredSignatureOf(info.element)} for ' '${info.element}'); } else if (info is ClosureTypeInformation) { print('${types.getInferredSignatureOf(info.element)} for ' '${info.element}'); } else if (info is DynamicCallSiteTypeInformation) { for (Element target in info.targets) { if (target is FunctionElement) { print('${types.getInferredSignatureOf(target)} for ${target}'); } else { print('${types.getInferredTypeOf(target).type} for ${target}'); } } } else { print('${info.type} for some unknown kind of closure'); } }); analyzedElements.forEach((Element elem) { TypeInformation type = types.getInferredTypeOf(elem); print('${elem} :: ${type} from ${type.assignments} '); }); } compiler.log('Inferred $overallRefineCount types.'); processLoopInformation(); } void analyze(Element element, ArgumentsTypes arguments) { element = element.implementation; if (analyzedElements.contains(element)) return; analyzedElements.add(element); SimpleTypeInferrerVisitor visitor = new SimpleTypeInferrerVisitor(element, compiler, this); TypeInformation type; compiler.withCurrentElement(element, () { type = visitor.run(); }); addedInGraph++; if (element.isField) { VariableElement fieldElement = element; ast.Node node = fieldElement.node; if (element.isFinal || element.isConst) { // If [element] is final and has an initializer, we record // the inferred type. if (fieldElement.initializer != null) { if (type is! ListTypeInformation && type is! MapTypeInformation) { // For non-container types, the constant handler does // constant folding that could give more precise results. ConstantExpression constant = compiler.backend.constants .getConstantForVariable(element); if (constant != null) { ConstantValue value = constant.value; if (value.isFunction) { FunctionConstantValue functionConstant = value; type = types.allocateClosure(node, functionConstant.element); } else { // Although we might find a better type, we have to keep // the old type around to ensure that we get a complete view // of the type graph and do not drop any flow edges. TypeMask refinedType = computeTypeMask(compiler, value); assert(TypeMask.assertIsNormalized(refinedType, classWorld)); type = new NarrowTypeInformation(type, refinedType); types.allocatedTypes.add(type); } } } recordType(element, type); } else if (!element.isInstanceMember) { recordType(element, types.nullType); } } else if (fieldElement.initializer == null) { // Only update types of static fields if there is no // assignment. Instance fields are dealt with in the constructor. if (Elements.isStaticOrTopLevelField(element)) { recordTypeOfNonFinalField(node, element, type); } } else { recordTypeOfNonFinalField(node, element, type); } if (Elements.isStaticOrTopLevelField(element) && fieldElement.initializer != null && !element.isConst) { var argument = fieldElement.initializer; // TODO(13429): We could do better here by using the // constant handler to figure out if it's a lazy field or not. if (argument.asSend() != null || (argument.asNewExpression() != null && !argument.isConst)) { recordType(element, types.nullType); } } } else { recordReturnType(element, type); } } void processLoopInformation() { allocatedCalls.forEach((info) { if (!info.inLoop) return; if (info is StaticCallSiteTypeInformation) { compiler.world.addFunctionCalledInLoop(info.calledElement); } else if (info.selector.mask != null && !info.selector.mask.containsAll(compiler.world)) { // For instance methods, we only register a selector called in a // loop if it is a typed selector, to avoid marking too many // methods as being called from within a loop. This cuts down // on the code bloat. info.targets.forEach(compiler.world.addFunctionCalledInLoop); } }); } void refine() { while (!workQueue.isEmpty) { if (compiler.shouldPrintProgress) { compiler.log('Inferred $overallRefineCount types.'); compiler.progress.reset(); } TypeInformation info = workQueue.remove(); TypeMask oldType = info.type; TypeMask newType = info.refine(this); // Check that refinement has not accidentially changed the type. assert(oldType == info.type); if (info.abandonInferencing) info.doNotEnqueue = true; if ((info.type = newType) != oldType) { overallRefineCount++; info.refineCount++; if (info.refineCount > MAX_CHANGE_COUNT) { if (_ANOMALY_WARN) { print("ANOMALY WARNING: max refinement reached for $info"); } info.giveUp(this); info.type = info.refine(this); info.doNotEnqueue = true; } workQueue.addAll(info.users); if (info.hasStableType(this)) { info.stabilize(this); } } } } void buildWorkQueue() { workQueue.addAll(types.typeInformations.values); workQueue.addAll(types.allocatedTypes); workQueue.addAll(types.allocatedClosures); workQueue.addAll(allocatedCalls); } /** * Update the assignments to parameters in the graph. [remove] tells * wheter assignments must be added or removed. If [init] is false, * parameters are added to the work queue. */ void updateParameterAssignments(TypeInformation caller, Element callee, ArgumentsTypes arguments, Selector selector, {bool remove, bool addToQueue: true}) { if (callee.name == Compiler.NO_SUCH_METHOD) return; if (callee.isField) { if (selector.isSetter) { ElementTypeInformation info = types.getInferredTypeOf(callee); if (remove) { info.removeAssignment(arguments.positional[0]); } else { info.addAssignment(arguments.positional[0]); } if (addToQueue) workQueue.add(info); } } else if (callee.isGetter) { return; } else if (selector != null && selector.isGetter) { // We are tearing a function off and thus create a closure. assert(callee.isFunction); MemberTypeInformation info = types.getInferredTypeOf(callee); if (remove) { info.closurizedCount--; } else { info.closurizedCount++; if (Elements.isStaticOrTopLevel(callee)) { types.allocatedClosures.add(info); } else { // We add the call-site type information here so that we // can benefit from further refinement of the selector. types.allocatedClosures.add(caller); } FunctionElement function = callee.implementation; FunctionSignature signature = function.functionSignature; signature.forEachParameter((Element parameter) { ParameterTypeInformation info = types.getInferredTypeOf(parameter); info.tagAsTearOffClosureParameter(this); if (addToQueue) workQueue.add(info); }); } } else { FunctionElement function = callee.implementation; FunctionSignature signature = function.functionSignature; int parameterIndex = 0; bool visitingRequiredParameter = true; signature.forEachParameter((Element parameter) { if (signature.hasOptionalParameters && parameter == signature.firstOptionalParameter) { visitingRequiredParameter = false; } TypeInformation type = visitingRequiredParameter ? arguments.positional[parameterIndex] : signature.optionalParametersAreNamed ? arguments.named[parameter.name] : parameterIndex < arguments.positional.length ? arguments.positional[parameterIndex] : null; if (type == null) type = getDefaultTypeOfParameter(parameter); TypeInformation info = types.getInferredTypeOf(parameter); if (remove) { info.removeAssignment(type); } else { info.addAssignment(type); } parameterIndex++; if (addToQueue) workQueue.add(info); }); } } /** * Sets the type of a parameter's default value to [type]. If the global * mapping in [defaultTypeOfParameter] already contains a type, it must be * a [PlaceholderTypeInformation], which will be replaced. All its uses are * updated. */ void setDefaultTypeOfParameter(ParameterElement parameter, TypeInformation type) { assert(parameter.functionDeclaration.isImplementation); TypeInformation existing = defaultTypeOfParameter[parameter]; defaultTypeOfParameter[parameter] = type; TypeInformation info = types.getInferredTypeOf(parameter); if (existing != null && existing is PlaceholderTypeInformation) { // Replace references to [existing] to use [type] instead. if (parameter.functionDeclaration.isInstanceMember) { ParameterAssignments assignments = info.assignments; assignments.replace(existing, type); type.addUser(info); } else { List<TypeInformation> assignments = info.assignments; for (int i = 0; i < assignments.length; i++) { if (assignments[i] == existing) { assignments[i] = type; type.addUser(info); } } } } else { assert(existing == null); } } /** * Returns the [TypeInformation] node for the default value of a parameter. * If this is queried before it is set by [setDefaultTypeOfParameter], a * [PlaceholderTypeInformation] is returned, which will later be replaced * by the actual node when [setDefaultTypeOfParameter] is called. * * Invariant: After graph construction, no [PlaceholderTypeInformation] nodes * should be present and a default type for each parameter should * exist. */ TypeInformation getDefaultTypeOfParameter(Element parameter) { return defaultTypeOfParameter.putIfAbsent(parameter, () { return new PlaceholderTypeInformation(types.currentMember); }); } /** * Helper to inspect the [TypeGraphInferrer]'s state. To be removed by * TODO(johnniwinther) once synthetic parameters get their own default * values. */ bool hasAlreadyComputedTypeOfParameterDefault(Element parameter) { TypeInformation seen = defaultTypeOfParameter[parameter]; return (seen != null && seen is! PlaceholderTypeInformation); } TypeInformation typeOfElement(Element element) { if (element is FunctionElement) return types.functionType; return types.getInferredTypeOf(element); } TypeInformation returnTypeOfElement(Element element) { if (element is !FunctionElement) return types.dynamicType; return types.getInferredTypeOf(element); } void recordTypeOfFinalField(Spannable node, Element analyzed, Element element, TypeInformation type) { types.getInferredTypeOf(element).addAssignment(type); } void recordTypeOfNonFinalField(Spannable node, Element element, TypeInformation type) { types.getInferredTypeOf(element).addAssignment(type); } void recordType(Element element, TypeInformation type) { types.getInferredTypeOf(element).addAssignment(type); } void recordReturnType(Element element, TypeInformation type) { TypeInformation info = types.getInferredTypeOf(element); if (element.name == '==') { // Even if x.== doesn't return a bool, 'x == null' evaluates to 'false'. info.addAssignment(types.boolType); } // TODO(ngeoffray): Clean up. We do these checks because // [SimpleTypesInferrer] deals with two different inferrers. if (type == null) return; if (info.assignments.isEmpty) info.addAssignment(type); } TypeInformation addReturnTypeFor(Element element, TypeInformation unused, TypeInformation newType) { TypeInformation type = types.getInferredTypeOf(element); // TODO(ngeoffray): Clean up. We do this check because // [SimpleTypesInferrer] deals with two different inferrers. if (element.isGenerativeConstructor) return type; type.addAssignment(newType); return type; } TypeInformation registerCalledElement(Spannable node, Selector selector, Element caller, Element callee, ArgumentsTypes arguments, SideEffects sideEffects, bool inLoop) { CallSiteTypeInformation info = new StaticCallSiteTypeInformation( types.currentMember, node, caller, callee, selector, arguments, inLoop); info.addToGraph(this); allocatedCalls.add(info); updateSideEffects(sideEffects, selector, callee); return info; } TypeInformation registerCalledSelector(ast.Node node, Selector selector, TypeInformation receiverType, Element caller, ArgumentsTypes arguments, SideEffects sideEffects, bool inLoop) { if (selector.isClosureCall) { return registerCalledClosure( node, selector, receiverType, caller, arguments, sideEffects, inLoop); } compiler.world.allFunctions.filter(selector).forEach((callee) { updateSideEffects(sideEffects, selector, callee); }); CallSiteTypeInformation info = new DynamicCallSiteTypeInformation( types.currentMember, node, caller, selector, receiverType, arguments, inLoop); info.addToGraph(this); allocatedCalls.add(info); return info; } TypeInformation registerAwait(ast.Node node, TypeInformation argument) { AwaitTypeInformation info = new AwaitTypeInformation(types.currentMember, node); info.addAssignment(argument); types.allocatedTypes.add(info); return info; } TypeInformation registerCalledClosure(ast.Node node, Selector selector, TypeInformation closure, Element caller, ArgumentsTypes arguments, SideEffects sideEffects, bool inLoop) { sideEffects.setDependsOnSomething(); sideEffects.setAllSideEffects(); CallSiteTypeInformation info = new ClosureCallSiteTypeInformation( types.currentMember, node, caller, selector, closure, arguments, inLoop); info.addToGraph(this); allocatedCalls.add(info); return info; } // Sorts the resolved elements by size. We do this for this inferrer // to get the same results for [ListTracer] compared to the // [SimpleTypesInferrer]. Iterable<Element> sortResolvedElements() { int max = 0; Map<int, Setlet<Element>> methodSizes = new Map<int, Setlet<Element>>(); compiler.enqueuer.resolution.resolvedElements.forEach((AstElement element) { // TODO(ngeoffray): Not sure why the resolver would put a null // mapping. if (!compiler.enqueuer.resolution.hasBeenResolved(element)) return; TreeElementMapping mapping = element.resolvedAst.elements; element = element.implementation; if (element.impliesType) return; assert(invariant(element, element.isField || element.isFunction || element.isGenerativeConstructor || element.isGetter || element.isSetter, message: 'Unexpected element kind: ${element.kind}')); if (element.isAbstract) return; // Put the other operators in buckets by length, later to be added in // length order. int length = mapping.getSelectorCount(); max = length > max ? length : max; Setlet<Element> set = methodSizes.putIfAbsent( length, () => new Setlet<Element>()); set.add(element); }); List<Element> result = <Element>[]; for (int i = 0; i <= max; i++) { Setlet<Element> set = methodSizes[i]; if (set != null) result.addAll(set); } return result; } void clear() { allocatedCalls.clear(); defaultTypeOfParameter.clear(); types.typeInformations.values.forEach((info) => info.clear()); types.allocatedTypes.clear(); types.concreteTypes.clear(); types.allocatedClosures.clear(); analyzedElements.clear(); generativeConstructorsExposingThis.clear(); } Iterable<Element> getCallersOf(Element element) { if (compiler.disableTypeInference) { throw new UnsupportedError( "Cannot query the type inferrer when type inference is disabled."); } MemberTypeInformation info = types.getInferredTypeOf(element); return info.callers; } /** * Returns the type of [element] when being called with [selector]. */ TypeInformation typeOfElementWithSelector(Element element, Selector selector) { if (element.name == Compiler.NO_SUCH_METHOD && selector.name != element.name) { // An invocation can resolve to a [noSuchMethod], in which case // we get the return type of [noSuchMethod]. return returnTypeOfElement(element); } else if (selector.isGetter) { if (element.isFunction) { // [functionType] is null if the inferrer did not run. return types.functionType == null ? types.dynamicType : types.functionType; } else if (element.isField) { return typeOfElement(element); } else if (Elements.isUnresolved(element)) { return types.dynamicType; } else { assert(element.isGetter); return returnTypeOfElement(element); } } else if (element.isGetter || element.isField) { assert(selector.isCall || selector.isSetter); return types.dynamicType; } else { return returnTypeOfElement(element); } } void recordCapturedLocalRead(Local local) {} void recordLocalUpdate(Local local, TypeInformation type) {} } class TypeGraphInferrer implements TypesInferrer { TypeGraphInferrerEngine inferrer; final Compiler compiler; TypeGraphInferrer(Compiler this.compiler); String get name => 'Graph inferrer'; void analyzeMain(Element main) { inferrer = new TypeGraphInferrerEngine(compiler, main); inferrer.runOverAllElements(); /*@@@EXTENSION: Experiment, dump compiler types*/ //JSON begin if(compiler.verbose) { print("JSON Start"); print("{"); String result = ""; for(Element el in inferrer.types.typeInformations.keys) { String key = ""; String values = ""; if(el is FieldElementX) { String className = (el.enclosingClass != null ? el.enclosingClass.name : ''); String fieldName = el.name; if(className != null && className != "") { key = "field::$className::$fieldName"; } else { key = "field::$fieldName"; } } else if(el is LocalParameterElementX) { String className = (el.enclosingClass != null ? el.enclosingClass.name : ''); String functionName = (el.enclosingElement != null ? el.enclosingElement.name : ''); String paramName = el.name; if(className != null && className != "") { key = "param::$className::$functionName::$paramName"; } else { key = "param::$functionName::$paramName"; } } else if(el is PartialFunctionElement) { if(el.isSetter) continue;//We do not care about setter return type String className = (el.enclosingClass != null ? el.enclosingClass.name : ''); String functionName = el.name; if(className != null && className != "") { key = "fun::$className::$functionName"; } else { key = "fun::$functionName"; } } else { //result += "\"OTHER:$el \": \"${inferrer.types.typeInformations[el].type}\",\n"; continue; } TypeMask type = inferrer.types.typeInformations[el].type; values = _resolveTypes(type, el); if(key != "") { result += "\"${el.library.name}::$key\" : [$values],\n"; } } //JSON end print(result.substring(0, result.length - 2)); print("}"); print("JSON End"); } /*@@@END EXTENSION*/ } /*@@@EXTENSION: Experiment, dump compiler types*/ String _resolveTypes(TypeMask type, var el, [String acc = ""]) { if(type is FlatTypeMask) { return "\"${_typeMaskToString(type)}\""; } else if(type is UnionTypeMask) { for(FlatTypeMask t in type.disjointMasks) { acc += "\"${_typeMaskToString(t)}\","; } if(acc.length >= 1) acc = acc.substring(0, acc.length - 1); return acc; } else if(type is ForwardingTypeMask) { return _resolveTypes(type.forwardTo, el, acc); } else { print("ERROR: $el : ${type.runtimeType} ---> $type"); } return ""; } String _typeMaskToString(FlatTypeMask type){ String name = (type.base != null ? type.base.name : "void"); String lib; if(type.base != null && type.base.library != null) { if(type.base.library.isDartCore) { lib = "core::"; } else { lib = type.base.library.name + "::"; } } else { if(type.base != null) { lib = "empty_library::"; } else { lib = ""; } } switch(name) { case 'JSInt' : return "core::int"; case 'JSInt32' : return "core::int"; case 'JSInt31' : return "core::int"; case 'JSUInt' : return "core::int"; case 'JSUInt31' : return "core::int"; case 'JSUInt32' : return "core::int"; case 'JSPositiveInt' : return "core::int"; case 'JSString' : return "core::String"; case 'JSBool' : return "core::bool"; case 'JSArray' : return "core::List"; case 'JSNumber' : return "core::num"; case 'JSDouble' : return "core::double"; case 'JSFixedArray' : return "core::List"; case 'void' : return "void"; default : return "$lib$name"; } } /*@@@END EXTENSION*/ TypeMask getReturnTypeOfElement(Element element) { if (compiler.disableTypeInference) return compiler.typesTask.dynamicType; // Currently, closure calls return dynamic. if (element is! FunctionElement) return compiler.typesTask.dynamicType; return inferrer.types.getInferredTypeOf(element).type; } TypeMask getTypeOfElement(Element element) { if (compiler.disableTypeInference) return compiler.typesTask.dynamicType; // The inferrer stores the return type for a function, so we have to // be careful to not return it here. if (element is FunctionElement) return compiler.typesTask.functionType; return inferrer.types.getInferredTypeOf(element).type; } TypeMask getTypeOfNode(Element owner, ast.Node node) { if (compiler.disableTypeInference) return compiler.typesTask.dynamicType; return inferrer.types.allocatedLists[node].type; } bool isFixedArrayCheckedForGrowable(ast.Node node) { if (compiler.disableTypeInference) return true; ListTypeInformation info = inferrer.types.allocatedLists[node]; return info.checksGrowable; } TypeMask getTypeOfSelector(Selector selector) { if (compiler.disableTypeInference) return compiler.typesTask.dynamicType; // Bailout for closure calls. We're not tracking types of // closures. if (selector.isClosureCall) return compiler.typesTask.dynamicType; if (selector.isSetter || selector.isIndexSet) { return compiler.typesTask.dynamicType; } if (inferrer.returnsListElementType(selector)) { ContainerTypeMask mask = selector.mask; TypeMask elementType = mask.elementType; return elementType == null ? compiler.typesTask.dynamicType : elementType; } if (inferrer.returnsMapValueType(selector)) { MapTypeMask mask = selector.mask; TypeMask valueType = mask.valueType; return valueType == null ? compiler.typesTask.dynamicType : valueType; } TypeMask result = const TypeMask.nonNullEmpty(); Iterable<Element> elements = compiler.world.allFunctions.filter(selector); for (Element element in elements) { TypeMask type = inferrer.typeOfElementWithSelector(element, selector).type; result = result.union(type, compiler.world); } return result; } Iterable<Element> getCallersOf(Element element) { if (compiler.disableTypeInference) { throw new UnsupportedError( "Cannot query the type inferrer when type inference is disabled."); } return inferrer.getCallersOf(element); } bool isCalledOnce(Element element) { if (compiler.disableTypeInference) return false; MemberTypeInformation info = inferrer.types.getInferredTypeOf(element); return info.isCalledOnce(); } void clear() { inferrer.clear(); } }