| // Copyright (c) 2017, 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. |
| |
| import 'package:kernel/ast.dart' as ir; |
| |
| import '../closure.dart'; |
| import '../common.dart'; |
| import '../common/names.dart'; |
| import '../constants/constant_system.dart' as constant_system; |
| import '../constants/values.dart'; |
| import '../elements/entities.dart'; |
| import '../elements/jumps.dart'; |
| import '../elements/types.dart'; |
| import '../inferrer/abstract_value_domain.dart'; |
| import '../inferrer/types.dart'; |
| import '../ir/constants.dart'; |
| import '../ir/static_type_provider.dart'; |
| import '../ir/util.dart'; |
| import '../js_backend/field_analysis.dart'; |
| import '../js_model/element_map.dart'; |
| import '../js_model/locals.dart' show JumpVisitor; |
| import '../js_model/js_world.dart'; |
| import '../native/behavior.dart'; |
| import '../options.dart'; |
| import '../universe/selector.dart'; |
| import '../universe/side_effects.dart'; |
| import '../util/util.dart'; |
| import 'inferrer_engine.dart'; |
| import 'locals_handler.dart'; |
| import 'type_graph_nodes.dart'; |
| import 'type_system.dart'; |
| |
| /// [KernelTypeGraphBuilder] constructs a type-inference graph for a particular |
| /// element. |
| /// |
| /// Calling [run] will start the work of visiting the body of the code to |
| /// construct a set of inference-nodes that abstractly represent what the code |
| /// is doing. |
| class KernelTypeGraphBuilder extends ir.Visitor<TypeInformation> { |
| final CompilerOptions _options; |
| final JsClosedWorld _closedWorld; |
| final InferrerEngine _inferrer; |
| final TypeSystem _types; |
| final MemberEntity _analyzedMember; |
| final ir.Node _analyzedNode; |
| final KernelToLocalsMap _localsMap; |
| final GlobalTypeInferenceElementData _memberData; |
| final bool _inGenerativeConstructor; |
| |
| LocalState _stateInternal; |
| LocalState _stateAfterWhenTrueInternal; |
| LocalState _stateAfterWhenFalseInternal; |
| |
| /// Returns the current local state for when the boolean value of the most |
| /// recently visited node is not taken into account |
| LocalState get _state { |
| return _stateInternal; |
| } |
| |
| /// Sets the current local state for when the boolean value of the most |
| /// recently visited node is not taken into account |
| /// |
| /// This used for when the most recently visited node is not a boolean |
| /// expression and there for also resets [_stateAfterWhenTrue] and |
| /// [_stateAfterWhenFalse] to the same value. |
| void set _state(LocalState value) { |
| _stateInternal = value; |
| _stateAfterWhenTrueInternal = _stateAfterWhenFalseInternal = null; |
| } |
| |
| /// Returns the current local state for when the most recently visited node |
| /// has evaluated to `true`. |
| /// |
| /// If the most recently visited node is not a boolean expression then this is |
| /// the same as [_state]. |
| LocalState get _stateAfterWhenTrue => |
| _stateAfterWhenTrueInternal ?? _stateInternal; |
| |
| /// Returns the current local state for when the most recently visited node |
| /// has evaluated to `false`. |
| /// |
| /// If the most recently visited node is not a boolean expression then this is |
| /// the same as [_state]. |
| LocalState get _stateAfterWhenFalse => |
| _stateAfterWhenFalseInternal ?? _stateInternal; |
| |
| /// Sets the current local state. [base] is the local state for when the |
| /// boolean value of the most recently visited node is not taken into account. |
| /// [whenTrue] and [whenFalse] are the local state for when the boolean value |
| /// of the most recently visited node is `true` or `false`, respectively. |
| void _setStateAfter( |
| LocalState base, LocalState whenTrue, LocalState whenFalse) { |
| _stateInternal = base; |
| _stateAfterWhenTrueInternal = whenTrue; |
| _stateAfterWhenFalseInternal = whenFalse; |
| } |
| |
| final SideEffectsBuilder _sideEffectsBuilder; |
| final Map<JumpTarget, List<LocalState>> _breaksFor = |
| <JumpTarget, List<LocalState>>{}; |
| final Map<JumpTarget, List<LocalState>> _continuesFor = |
| <JumpTarget, List<LocalState>>{}; |
| TypeInformation _returnType; |
| final Set<Local> _capturedVariables = new Set<Local>(); |
| final Map<Local, FieldEntity> _capturedAndBoxed; |
| |
| final StaticTypeProvider _staticTypeProvider; |
| |
| /// Whether we currently taken the boolean result of is-checks or null-checks |
| /// into account in the local state. |
| bool _accumulateIsChecks = false; |
| |
| KernelTypeGraphBuilder( |
| this._options, |
| this._closedWorld, |
| this._inferrer, |
| this._analyzedMember, |
| this._analyzedNode, |
| this._localsMap, |
| this._staticTypeProvider, |
| [this._stateInternal, |
| Map<Local, FieldEntity> capturedAndBoxed]) |
| : this._types = _inferrer.types, |
| this._memberData = _inferrer.dataOfMember(_analyzedMember), |
| // TODO(johnniwinther): Should side effects also be tracked for field |
| // initializers? |
| this._sideEffectsBuilder = _analyzedMember is FunctionEntity |
| ? _inferrer.inferredDataBuilder |
| .getSideEffectsBuilder(_analyzedMember) |
| : new SideEffectsBuilder.free(_analyzedMember), |
| this._inGenerativeConstructor = _analyzedNode is ir.Constructor, |
| this._capturedAndBoxed = capturedAndBoxed != null |
| ? new Map<Local, FieldEntity>.from(capturedAndBoxed) |
| : <Local, FieldEntity>{} { |
| if (_state != null) return; |
| |
| _state = new LocalState.initial( |
| inGenerativeConstructor: _inGenerativeConstructor); |
| } |
| |
| JsToElementMap get _elementMap => _closedWorld.elementMap; |
| |
| ClosureData get _closureDataLookup => _closedWorld.closureDataLookup; |
| |
| DartType _getStaticType(ir.Expression node) { |
| return _elementMap.getDartType(_staticTypeProvider.getStaticType(node)); |
| } |
| |
| int _loopLevel = 0; |
| |
| bool get inLoop => _loopLevel > 0; |
| |
| /// Returns `true` if [member] is defined in a subclass of the current this |
| /// type. |
| bool _isInClassOrSubclass(MemberEntity member) { |
| ClassEntity cls = _elementMap.getMemberThisType(_analyzedMember)?.element; |
| if (cls == null) return false; |
| return _closedWorld.classHierarchy.isSubclassOf(member.enclosingClass, cls); |
| } |
| |
| /// Checks whether the access or update of [selector] on [mask] potentially |
| /// exposes `this`. |
| /// |
| /// If all matching members are instance fields on the current `this` |
| /// class or subclasses, `this` is not considered to be exposed. |
| /// |
| /// If an instance field matched with a [selector] that is _not_ a setter, the |
| /// field is considered to have been read before initialization and the field |
| /// is assumed to be potentially `null`. |
| void _checkIfExposesThis(Selector selector, AbstractValue mask) { |
| if (_state.isThisExposed) { |
| // We already consider `this` to have been exposed. |
| return; |
| } |
| if (_inferrer.closedWorld.includesClosureCall(selector, mask)) { |
| // TODO(ngeoffray): We could do better here if we knew what we |
| // are calling does not expose this. |
| _state.markThisAsExposed(); |
| } else { |
| _inferrer.forEachElementMatching(selector, mask, (MemberEntity element) { |
| if (element != null && element.isField) { |
| FieldEntity field = element; |
| if (!selector.isSetter && |
| _isInClassOrSubclass(field) && |
| field.isAssignable && |
| _state.readField(field) == null && |
| getFieldInitializer(_elementMap, field) == null) { |
| // If the field is being used before this constructor |
| // actually had a chance to initialize it, say it can be |
| // null. |
| _inferrer.recordTypeOfField(field, _types.nullType); |
| } |
| // Accessing a field does not expose `this`. |
| return true; |
| } |
| // TODO(ngeoffray): We could do better here if we knew what we |
| // are calling does not expose this. |
| _state.markThisAsExposed(); |
| return false; |
| }); |
| } |
| } |
| |
| TypeInformation run() { |
| if (_analyzedMember.isField) { |
| if (_analyzedNode == null || _analyzedNode is ir.NullLiteral) { |
| // Eagerly bailout, because computing the closure data only |
| // works for functions and field assignments. |
| return _types.nullType; |
| } |
| } |
| |
| // Update the locals that are boxed in [locals]. These locals will |
| // be handled specially, in that we are computing their LUB at |
| // each update, and reading them yields the type that was found in a |
| // previous analysis of [outermostElement]. |
| ScopeInfo scopeInfo = _closureDataLookup.getScopeInfo(_analyzedMember); |
| scopeInfo.forEachBoxedVariable((variable, field) { |
| _capturedAndBoxed[variable] = field; |
| }); |
| |
| return visit(_analyzedNode); |
| } |
| |
| bool isIncompatibleInvoke(FunctionEntity function, ArgumentsTypes arguments) { |
| ParameterStructure parameterStructure = function.parameterStructure; |
| |
| return arguments.positional.length < |
| parameterStructure.requiredParameters || |
| arguments.positional.length > parameterStructure.positionalParameters || |
| arguments.named.keys |
| .any((name) => !parameterStructure.namedParameters.contains(name)); |
| } |
| |
| void recordReturnType(TypeInformation type) { |
| FunctionEntity analyzedMethod = _analyzedMember; |
| _returnType = |
| _inferrer.addReturnTypeForMethod(analyzedMethod, _returnType, type); |
| } |
| |
| TypeInformation _thisType; |
| TypeInformation get thisType { |
| if (_thisType != null) return _thisType; |
| ClassEntity cls = _elementMap.getMemberThisType(_analyzedMember)?.element; |
| if (_closedWorld.isUsedAsMixin(cls)) { |
| return _thisType = _types.nonNullSubtype(cls); |
| } else { |
| return _thisType = _types.nonNullSubclass(cls); |
| } |
| } |
| |
| TypeInformation visit(ir.Node node, {bool conditionContext: false}) { |
| var oldAccumulateIsChecks = _accumulateIsChecks; |
| _accumulateIsChecks = conditionContext; |
| var result = node?.accept(this); |
| _accumulateIsChecks = oldAccumulateIsChecks; |
| return result; |
| } |
| |
| void visitList(List<ir.Node> nodes) { |
| if (nodes == null) return; |
| nodes.forEach(visit); |
| } |
| |
| void handleParameter(ir.VariableDeclaration node, {bool isOptional}) { |
| Local local = _localsMap.getLocalVariable(node); |
| DartType type = _localsMap.getLocalType(_elementMap, local); |
| _state.updateLocal(_inferrer, _capturedAndBoxed, local, |
| _inferrer.typeOfParameter(local), node, type); |
| if (isOptional) { |
| TypeInformation type; |
| if (node.initializer != null) { |
| type = visit(node.initializer); |
| } else { |
| type = _types.nullType; |
| } |
| _inferrer.setDefaultTypeOfParameter(local, type, |
| isInstanceMember: _analyzedMember.isInstanceMember); |
| } |
| } |
| |
| @override |
| TypeInformation visitConstructor(ir.Constructor node) { |
| handleParameters(node.function); |
| node.initializers.forEach(visit); |
| visit(node.function.body); |
| |
| ClassEntity cls = _analyzedMember.enclosingClass; |
| if (!(node.initializers.isNotEmpty && |
| node.initializers.first is ir.RedirectingInitializer)) { |
| // Iterate over all instance fields, and give a null type to |
| // fields that we haven't initialized for sure. |
| _elementMap.elementEnvironment.forEachLocalClassMember(cls, |
| (MemberEntity member) { |
| if (member.isField && member.isInstanceMember && member.isAssignable) { |
| TypeInformation type = _state.readField(member); |
| MemberDefinition definition = _elementMap.getMemberDefinition(member); |
| assert(definition.kind == MemberKind.regular); |
| ir.Field node = definition.node; |
| if (type == null && |
| (node.initializer == null || |
| node.initializer is ir.NullLiteral)) { |
| _inferrer.recordTypeOfField(member, _types.nullType); |
| } |
| } |
| }); |
| } |
| _inferrer.recordExposesThis(_analyzedMember, _state.isThisExposed); |
| |
| if (cls.isAbstract) { |
| if (_closedWorld.classHierarchy.isInstantiated(cls)) { |
| _returnType = _types.nonNullSubclass(cls); |
| } else { |
| // TODO(johnniwinther): Avoid analyzing [_analyzedMember] in this |
| // case; it's never called. |
| _returnType = _types.nonNullEmpty(); |
| } |
| } else { |
| _returnType = _types.nonNullExact(cls); |
| } |
| assert(_breaksFor.isEmpty); |
| assert(_continuesFor.isEmpty); |
| return _returnType; |
| } |
| |
| @override |
| visitFieldInitializer(ir.FieldInitializer node) { |
| TypeInformation rhsType = visit(node.value); |
| FieldEntity field = _elementMap.getField(node.field); |
| _state.updateField(field, rhsType); |
| _inferrer.recordTypeOfField(field, rhsType); |
| return null; |
| } |
| |
| @override |
| visitSuperInitializer(ir.SuperInitializer node) { |
| ConstructorEntity constructor = _elementMap.getConstructor(node.target); |
| ArgumentsTypes arguments = analyzeArguments(node.arguments); |
| Selector selector = new Selector(SelectorKind.CALL, constructor.memberName, |
| _elementMap.getCallStructure(node.arguments)); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| handleConstructorInvoke( |
| node, node.arguments, selector, mask, constructor, arguments); |
| |
| _inferrer.analyze(constructor); |
| if (_inferrer.checkIfExposesThis(constructor)) { |
| _state.markThisAsExposed(); |
| } |
| return null; |
| } |
| |
| @override |
| visitRedirectingInitializer(ir.RedirectingInitializer node) { |
| ConstructorEntity constructor = _elementMap.getConstructor(node.target); |
| ArgumentsTypes arguments = analyzeArguments(node.arguments); |
| Selector selector = new Selector(SelectorKind.CALL, constructor.memberName, |
| _elementMap.getCallStructure(node.arguments)); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| handleConstructorInvoke( |
| node, node.arguments, selector, mask, constructor, arguments); |
| |
| _inferrer.analyze(constructor); |
| if (_inferrer.checkIfExposesThis(constructor)) { |
| _state.markThisAsExposed(); |
| } |
| return null; |
| } |
| |
| @override |
| visitLocalInitializer(ir.LocalInitializer node) { |
| visit(node.variable); |
| return null; |
| } |
| |
| void handleParameters(ir.FunctionNode node) { |
| int position = 0; |
| for (ir.VariableDeclaration parameter in node.positionalParameters) { |
| handleParameter(parameter, |
| isOptional: position >= node.requiredParameterCount); |
| position++; |
| } |
| for (ir.VariableDeclaration parameter in node.namedParameters) { |
| handleParameter(parameter, isOptional: true); |
| } |
| } |
| |
| @override |
| TypeInformation visitFunctionNode(ir.FunctionNode node) { |
| handleParameters(node); |
| |
| if (_closedWorld.nativeData.isNativeMember(_analyzedMember)) { |
| // Native methods do not have a body, and we currently just say |
| // they return dynamic. |
| return _types.dynamicType; |
| } |
| |
| visit(node.body); |
| switch (node.asyncMarker) { |
| case ir.AsyncMarker.Sync: |
| if (_returnType == null) { |
| // No return in the body. |
| _returnType = _state.seenReturnOrThrow |
| ? _types.nonNullEmpty() // Body always throws. |
| : _types.nullType; |
| } else if (!_state.seenReturnOrThrow) { |
| // We haven'TypeInformation seen returns on all branches. So the |
| // method may also return null. |
| recordReturnType(_types.nullType); |
| } |
| break; |
| |
| case ir.AsyncMarker.SyncStar: |
| // TODO(asgerf): Maybe make a ContainerTypeMask for these? The type |
| // contained is the method body's return type. |
| recordReturnType(_types.syncStarIterableType); |
| break; |
| |
| case ir.AsyncMarker.Async: |
| recordReturnType(_types.asyncFutureType); |
| break; |
| |
| case ir.AsyncMarker.AsyncStar: |
| recordReturnType(_types.asyncStarStreamType); |
| break; |
| case ir.AsyncMarker.SyncYielding: |
| failedAt( |
| _analyzedMember, "Unexpected async marker: ${node.asyncMarker}"); |
| break; |
| } |
| assert(_breaksFor.isEmpty); |
| assert(_continuesFor.isEmpty); |
| return _returnType; |
| } |
| |
| @override |
| TypeInformation visitInstantiation(ir.Instantiation node) { |
| return createInstantiationTypeInformation(visit(node.expression)); |
| } |
| |
| TypeInformation createInstantiationTypeInformation( |
| TypeInformation expressionType) { |
| // TODO(sra): Add a TypeInformation for Instantiations. Instantiated |
| // generic methods will need to be traced separately, and have the |
| // information gathered in tracing reflected back to the generic method. For |
| // now, pass along the uninstantiated method. |
| return expressionType; |
| } |
| |
| @override |
| TypeInformation defaultExpression(ir.Expression node) { |
| throw new UnimplementedError( |
| 'Unhandled expression: ${node} (${node.runtimeType})'); |
| } |
| |
| @override |
| defaultStatement(ir.Statement node) { |
| throw new UnimplementedError( |
| 'Unhandled statement: ${node} (${node.runtimeType})'); |
| } |
| |
| @override |
| TypeInformation visitNullLiteral(ir.NullLiteral literal) { |
| return createNullTypeInformation(); |
| } |
| |
| TypeInformation createNullTypeInformation() { |
| return _types.nullType; |
| } |
| |
| @override |
| visitBlock(ir.Block block) { |
| for (ir.Statement statement in block.statements) { |
| visit(statement); |
| if (_state.aborts) break; |
| } |
| return null; |
| } |
| |
| @override |
| visitExpressionStatement(ir.ExpressionStatement node) { |
| visit(node.expression); |
| return null; |
| } |
| |
| @override |
| visitEmptyStatement(ir.EmptyStatement node) { |
| // Nothing to do. |
| return null; |
| } |
| |
| @override |
| visitAssertStatement(ir.AssertStatement node) { |
| // Avoid pollution from assert statement unless enabled. |
| if (!_options.enableUserAssertions) { |
| return null; |
| } |
| // TODO(johnniwinther): Should assert be used with --trust-type-annotations? |
| // TODO(johnniwinther): Track reachable for assertions known to fail. |
| LocalState stateBefore = _state; |
| handleCondition(node.condition); |
| LocalState afterConditionWhenTrue = _stateAfterWhenTrue; |
| LocalState afterConditionWhenFalse = _stateAfterWhenFalse; |
| _state = new LocalState.childPath(afterConditionWhenFalse); |
| visit(node.message); |
| LocalState stateAfterMessage = _state; |
| stateAfterMessage.seenReturnOrThrow = true; |
| _state = stateBefore.mergeDiamondFlow( |
| _inferrer, afterConditionWhenTrue, stateAfterMessage); |
| return null; |
| } |
| |
| @override |
| visitBreakStatement(ir.BreakStatement node) { |
| JumpTarget target = _localsMap.getJumpTargetForBreak(node); |
| _state.seenBreakOrContinue = true; |
| // Do a deep-copy of the locals, because the code following the |
| // break will change them. |
| if (_localsMap.generateContinueForBreak(node)) { |
| _continuesFor[target].add(new LocalState.deepCopyOf(_state)); |
| } else { |
| _breaksFor[target].add(new LocalState.deepCopyOf(_state)); |
| } |
| return null; |
| } |
| |
| @override |
| visitLabeledStatement(ir.LabeledStatement node) { |
| ir.Statement body = node.body; |
| if (JumpVisitor.canBeBreakTarget(body)) { |
| // Loops and switches handle their own labels. |
| visit(body); |
| } else { |
| JumpTarget jumpTarget = _localsMap.getJumpTargetForLabel(node); |
| _setupBreaksAndContinues(jumpTarget); |
| visit(body); |
| _state.mergeAfterBreaks(_inferrer, _getBreaks(jumpTarget)); |
| _clearBreaksAndContinues(jumpTarget); |
| } |
| return null; |
| } |
| |
| @override |
| visitSwitchStatement(ir.SwitchStatement node) { |
| visit(node.expression); |
| |
| JumpTarget jumpTarget = _localsMap.getJumpTargetForSwitch(node); |
| _setupBreaksAndContinues(jumpTarget); |
| |
| List<JumpTarget> continueTargets = <JumpTarget>[]; |
| for (ir.SwitchCase switchCase in node.cases) { |
| JumpTarget continueTarget = |
| _localsMap.getJumpTargetForSwitchCase(switchCase); |
| if (continueTarget != null) { |
| continueTargets.add(continueTarget); |
| } |
| } |
| if (continueTargets.isNotEmpty) { |
| continueTargets.forEach(_setupBreaksAndContinues); |
| |
| // If the switch statement has a continue, we conservatively |
| // visit all cases and update [locals] until we have reached a |
| // fixed point. |
| bool changed; |
| _state.startLoop(_inferrer, node); |
| do { |
| changed = false; |
| for (ir.SwitchCase switchCase in node.cases) { |
| LocalState stateBeforeCase = _state; |
| _state = new LocalState.childPath(stateBeforeCase); |
| visit(switchCase); |
| LocalState stateAfterCase = _state; |
| changed = |
| stateBeforeCase.mergeAll(_inferrer, [stateAfterCase]) || changed; |
| _state = stateBeforeCase; |
| } |
| } while (changed); |
| _state.endLoop(_inferrer, node); |
| |
| continueTargets.forEach(_clearBreaksAndContinues); |
| } else { |
| LocalState stateBeforeCase = _state; |
| List<LocalState> statesToMerge = <LocalState>[]; |
| bool hasDefaultCase = false; |
| |
| for (ir.SwitchCase switchCase in node.cases) { |
| if (switchCase.isDefault) { |
| hasDefaultCase = true; |
| } |
| _state = new LocalState.childPath(stateBeforeCase); |
| visit(switchCase); |
| statesToMerge.add(_state); |
| } |
| stateBeforeCase.mergeAfterBreaks(_inferrer, statesToMerge, |
| keepOwnLocals: !hasDefaultCase); |
| _state = stateBeforeCase; |
| } |
| _clearBreaksAndContinues(jumpTarget); |
| return null; |
| } |
| |
| @override |
| visitSwitchCase(ir.SwitchCase node) { |
| visit(node.body); |
| return null; |
| } |
| |
| @override |
| visitContinueSwitchStatement(ir.ContinueSwitchStatement node) { |
| JumpTarget target = _localsMap.getJumpTargetForContinueSwitch(node); |
| _state.seenBreakOrContinue = true; |
| // Do a deep-copy of the locals, because the code following the |
| // break will change them. |
| _continuesFor[target].add(new LocalState.deepCopyOf(_state)); |
| return null; |
| } |
| |
| @override |
| TypeInformation visitListLiteral(ir.ListLiteral node) { |
| return createListTypeInformation( |
| node, node.expressions.map((e) => visit(e)), |
| isConst: node.isConst); |
| } |
| |
| TypeInformation createListTypeInformation( |
| ir.TreeNode node, Iterable<TypeInformation> elementTypes, |
| {bool isConst}) { |
| // We only set the type once. We don't need to re-visit the children |
| // when re-analyzing the node. |
| return _inferrer.concreteTypes.putIfAbsent(node, () { |
| TypeInformation elementType; |
| int length = 0; |
| for (TypeInformation type in elementTypes) { |
| elementType = elementType == null |
| ? _types.allocatePhi(null, null, type, isTry: false) |
| : _types.addPhiInput(null, elementType, type); |
| length++; |
| } |
| elementType = elementType == null |
| ? _types.nonNullEmpty() |
| : _types.simplifyPhi(null, null, elementType); |
| TypeInformation containerType = |
| isConst ? _types.constListType : _types.growableListType; |
| return _types.allocateList( |
| containerType, node, _analyzedMember, elementType, length); |
| }); |
| } |
| |
| @override |
| TypeInformation visitSetLiteral(ir.SetLiteral node) { |
| return createSetTypeInformation(node, node.expressions.map((e) => visit(e)), |
| isConst: node.isConst); |
| } |
| |
| TypeInformation createSetTypeInformation( |
| ir.TreeNode node, Iterable<TypeInformation> elementTypes, |
| {bool isConst}) { |
| return _inferrer.concreteTypes.putIfAbsent(node, () { |
| TypeInformation elementType; |
| for (TypeInformation type in elementTypes) { |
| elementType = elementType == null |
| ? _types.allocatePhi(null, null, type, isTry: false) |
| : _types.addPhiInput(null, elementType, type); |
| } |
| elementType = elementType == null |
| ? _types.nonNullEmpty() |
| : _types.simplifyPhi(null, null, elementType); |
| TypeInformation containerType = |
| isConst ? _types.constSetType : _types.setType; |
| return _types.allocateSet( |
| containerType, node, _analyzedMember, elementType); |
| }); |
| } |
| |
| @override |
| TypeInformation visitMapLiteral(ir.MapLiteral node) { |
| return createMapTypeInformation( |
| node, node.entries.map((e) => new Pair(visit(e.key), visit(e.value))), |
| isConst: node.isConst); |
| } |
| |
| TypeInformation createMapTypeInformation(ir.TreeNode node, |
| Iterable<Pair<TypeInformation, TypeInformation>> entryTypes, |
| {bool isConst}) { |
| return _inferrer.concreteTypes.putIfAbsent(node, () { |
| List keyTypes = <TypeInformation>[]; |
| List valueTypes = <TypeInformation>[]; |
| |
| for (Pair<TypeInformation, TypeInformation> entryType in entryTypes) { |
| keyTypes.add(entryType.a); |
| valueTypes.add(entryType.b); |
| } |
| |
| TypeInformation type = isConst ? _types.constMapType : _types.mapType; |
| return _types.allocateMap( |
| type, node, _analyzedMember, keyTypes, valueTypes); |
| }); |
| } |
| |
| @override |
| TypeInformation visitReturnStatement(ir.ReturnStatement node) { |
| ir.Node expression = node.expression; |
| recordReturnType(expression == null ? _types.nullType : visit(expression)); |
| _state.seenReturnOrThrow = true; |
| _state.markInitializationAsIndefinite(); |
| return null; |
| } |
| |
| @override |
| TypeInformation visitBoolLiteral(ir.BoolLiteral node) { |
| return createBoolTypeInformation(node.value); |
| } |
| |
| TypeInformation createBoolTypeInformation(bool value) { |
| return _types.boolLiteralType(value); |
| } |
| |
| @override |
| TypeInformation visitIntLiteral(ir.IntLiteral node) { |
| return createIntTypeInformation(node.value); |
| } |
| |
| TypeInformation createIntTypeInformation(int value) { |
| // The JavaScript backend may turn this literal into a double at |
| // runtime. |
| return _types.getConcreteTypeFor(_closedWorld.abstractValueDomain |
| .computeAbstractValueForConstant( |
| constant_system.createIntFromInt(value))); |
| } |
| |
| @override |
| TypeInformation visitDoubleLiteral(ir.DoubleLiteral node) { |
| return createDoubleTypeInformation(node.value); |
| } |
| |
| TypeInformation createDoubleTypeInformation(double value) { |
| // The JavaScript backend may turn this literal into a double at |
| // runtime. |
| return _types.getConcreteTypeFor(_closedWorld.abstractValueDomain |
| .computeAbstractValueForConstant(constant_system.createDouble(value))); |
| } |
| |
| @override |
| TypeInformation visitStringLiteral(ir.StringLiteral node) { |
| return createStringTypeInformation(node.value); |
| } |
| |
| TypeInformation createStringTypeInformation(String value) { |
| return _types.stringLiteralType(value); |
| } |
| |
| @override |
| TypeInformation visitStringConcatenation(ir.StringConcatenation node) { |
| // Interpolation could have any effects since it could call any toString() |
| // method. |
| // TODO(sra): This could be modelled by a call to toString() but with a |
| // guaranteed String return type. Interpolation of known types would get |
| // specialized effects. This would not currently be effective since the JS |
| // code in the toString methods for intercepted primitive types is assumed |
| // to have all effects. Effect annotations on JS code would be needed to |
| // get the benefit. |
| _sideEffectsBuilder.setAllSideEffects(); |
| |
| node.visitChildren(this); |
| return _types.stringType; |
| } |
| |
| @override |
| TypeInformation visitSymbolLiteral(ir.SymbolLiteral node) { |
| return createSymbolLiteralTypeInformation(); |
| } |
| |
| TypeInformation createSymbolLiteralTypeInformation() { |
| return _types |
| .nonNullSubtype(_closedWorld.commonElements.symbolImplementationClass); |
| } |
| |
| @override |
| TypeInformation visitTypeLiteral(ir.TypeLiteral node) { |
| return createTypeLiteralInformation(); |
| } |
| |
| TypeInformation createTypeLiteralInformation() { |
| return _types.typeType; |
| } |
| |
| @override |
| TypeInformation visitVariableDeclaration(ir.VariableDeclaration node) { |
| assert( |
| node.parent is! ir.FunctionNode, "Unexpected parameter declaration."); |
| Local local = _localsMap.getLocalVariable(node); |
| DartType type = _localsMap.getLocalType(_elementMap, local); |
| if (node.initializer == null) { |
| _state.updateLocal( |
| _inferrer, _capturedAndBoxed, local, _types.nullType, node, type); |
| } else { |
| _state.updateLocal(_inferrer, _capturedAndBoxed, local, |
| visit(node.initializer), node, type); |
| } |
| if (node.initializer is ir.ThisExpression) { |
| _state.markThisAsExposed(); |
| } |
| return null; |
| } |
| |
| @override |
| TypeInformation visitVariableGet(ir.VariableGet node) { |
| Local local = _localsMap.getLocalVariable(node.variable); |
| TypeInformation type = |
| _state.readLocal(_inferrer, _capturedAndBoxed, local); |
| assert(type != null, "Missing type information for $local."); |
| return type; |
| } |
| |
| @override |
| TypeInformation visitVariableSet(ir.VariableSet node) { |
| TypeInformation rhsType = visit(node.value); |
| if (node.value is ir.ThisExpression) { |
| _state.markThisAsExposed(); |
| } |
| Local local = _localsMap.getLocalVariable(node.variable); |
| DartType type = _localsMap.getLocalType(_elementMap, local); |
| _state.updateLocal( |
| _inferrer, _capturedAndBoxed, local, rhsType, node, type); |
| return rhsType; |
| } |
| |
| ArgumentsTypes analyzeArguments(ir.Arguments arguments) { |
| List<TypeInformation> positional = <TypeInformation>[]; |
| Map<String, TypeInformation> named; |
| for (ir.Expression argument in arguments.positional) { |
| // TODO(ngeoffray): We could do better here if we knew what we |
| // are calling does not expose this. |
| if (argument is ir.ThisExpression) { |
| _state.markThisAsExposed(); |
| } |
| positional.add(visit(argument)); |
| } |
| for (ir.NamedExpression argument in arguments.named) { |
| named ??= <String, TypeInformation>{}; |
| ir.Expression value = argument.value; |
| // TODO(ngeoffray): We could do better here if we knew what we |
| // are calling does not expose this. |
| if (value is ir.ThisExpression) { |
| _state.markThisAsExposed(); |
| } |
| named[argument.name] = visit(value); |
| } |
| |
| return new ArgumentsTypes(positional, named); |
| } |
| |
| @override |
| TypeInformation visitMethodInvocation(ir.MethodInvocation node) { |
| Selector selector = _elementMap.getSelector(node); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| |
| ir.TreeNode receiver = node.receiver; |
| if (receiver is ir.VariableGet && |
| receiver.variable.parent is ir.FunctionDeclaration) { |
| // This is an invocation of a named local function. |
| ArgumentsTypes arguments = analyzeArguments(node.arguments); |
| ClosureRepresentationInfo info = |
| _closureDataLookup.getClosureInfo(receiver.variable.parent); |
| if (isIncompatibleInvoke(info.callMethod, arguments)) { |
| return _types.dynamicType; |
| } |
| |
| TypeInformation type = |
| handleStaticInvoke(node, selector, mask, info.callMethod, arguments); |
| FunctionType functionType = |
| _elementMap.elementEnvironment.getFunctionType(info.callMethod); |
| if (functionType.returnType.containsFreeTypeVariables) { |
| // The return type varies with the call site so we narrow the static |
| // return type. |
| type = _types.narrowType(type, _getStaticType(node)); |
| } |
| return type; |
| } |
| |
| TypeInformation receiverType = visit(receiver); |
| ArgumentsTypes arguments = analyzeArguments(node.arguments); |
| if (selector.name == '==') { |
| if (_types.isNull(receiverType)) { |
| // null == o |
| _potentiallyAddNullCheck(node, node.arguments.positional.first); |
| return _types.boolType; |
| } else if (_types.isNull(arguments.positional[0])) { |
| // o == null |
| _potentiallyAddNullCheck(node, node.receiver); |
| return _types.boolType; |
| } |
| } |
| if (node.receiver is ir.ThisExpression) { |
| _checkIfExposesThis( |
| selector, _types.newTypedSelector(receiverType, mask)); |
| } |
| TypeInformation type = handleDynamicInvoke( |
| CallType.access, node, selector, mask, receiverType, arguments); |
| ir.Member interfaceTarget = node.interfaceTarget; |
| if (interfaceTarget != null) { |
| if (interfaceTarget is ir.Procedure && |
| (interfaceTarget.kind == ir.ProcedureKind.Method || |
| interfaceTarget.kind == ir.ProcedureKind.Operator)) { |
| // Pull the type from kernel (instead of from the J-model) because the |
| // interface target might be abstract and therefore not part of the |
| // J-model. |
| ir.DartType returnType = interfaceTarget.function.returnType; |
| // The return type varies with the call site so we narrow the static |
| // return type. |
| if (containsFreeVariables(returnType)) { |
| type = _types.narrowType(type, _getStaticType(node)); |
| } |
| } else { |
| // The return type is thrown away when using [TypeMask]s; narrow to the |
| // static return type. |
| type = _types.narrowType(type, _getStaticType(node)); |
| } |
| } else { |
| // We don't have a known target but the static type hold some information |
| // if it is a function type. |
| type = _types.narrowType(type, _getStaticType(node)); |
| } |
| return type; |
| } |
| |
| TypeInformation _handleDynamic( |
| CallType callType, |
| ir.Node node, |
| Selector selector, |
| AbstractValue mask, |
| TypeInformation receiverType, |
| ArgumentsTypes arguments) { |
| assert(receiverType != null); |
| if (_types.selectorNeedsUpdate(receiverType, mask)) { |
| mask = receiverType == _types.dynamicType |
| ? null |
| : _types.newTypedSelector(receiverType, mask); |
| _inferrer.updateSelectorInMember( |
| _analyzedMember, callType, node, selector, mask); |
| } |
| |
| ir.VariableDeclaration variable; |
| if (node is ir.MethodInvocation && node.receiver is ir.VariableGet) { |
| ir.VariableGet get = node.receiver; |
| variable = get.variable; |
| } else if (node is ir.PropertyGet && node.receiver is ir.VariableGet) { |
| ir.VariableGet get = node.receiver; |
| variable = get.variable; |
| } else if (node is ir.PropertySet && node.receiver is ir.VariableGet) { |
| ir.VariableGet get = node.receiver; |
| variable = get.variable; |
| } |
| |
| if (variable != null) { |
| Local local = _localsMap.getLocalVariable(variable); |
| if (!_capturedVariables.contains(local)) { |
| DartType type = _localsMap.getLocalType(_elementMap, local); |
| _state.updateLocal( |
| _inferrer, _capturedAndBoxed, local, receiverType, node, type, |
| isNullable: selector.appliesToNullWithoutThrow()); |
| } |
| } |
| |
| return _inferrer.registerCalledSelector(callType, node, selector, mask, |
| receiverType, _analyzedMember, arguments, _sideEffectsBuilder, |
| inLoop: inLoop, isConditional: false); |
| } |
| |
| TypeInformation handleDynamicGet(ir.Node node, Selector selector, |
| AbstractValue mask, TypeInformation receiverType) { |
| return _handleDynamic( |
| CallType.access, node, selector, mask, receiverType, null); |
| } |
| |
| TypeInformation handleDynamicSet( |
| ir.Node node, |
| Selector selector, |
| AbstractValue mask, |
| TypeInformation receiverType, |
| TypeInformation rhsType) { |
| ArgumentsTypes arguments = new ArgumentsTypes([rhsType], null); |
| return _handleDynamic( |
| CallType.access, node, selector, mask, receiverType, arguments); |
| } |
| |
| TypeInformation handleDynamicInvoke( |
| CallType callType, |
| ir.Node node, |
| Selector selector, |
| AbstractValue mask, |
| TypeInformation receiverType, |
| ArgumentsTypes arguments) { |
| return _handleDynamic( |
| callType, node, selector, mask, receiverType, arguments); |
| } |
| |
| @override |
| TypeInformation visitLet(ir.Let node) { |
| visit(node.variable); |
| return visit(node.body); |
| } |
| |
| @override |
| TypeInformation visitBlockExpression(ir.BlockExpression node) { |
| visit(node.body); |
| return visit(node.value); |
| } |
| |
| @override |
| TypeInformation visitForInStatement(ir.ForInStatement node) { |
| if (node.iterable is ir.ThisExpression) { |
| // Any reasonable implementation of an iterator would expose |
| // this, so we play it safe and assume it will. |
| _state.markThisAsExposed(); |
| } |
| |
| AbstractValue currentMask; |
| AbstractValue moveNextMask; |
| TypeInformation iteratorType; |
| if (node.isAsync) { |
| TypeInformation expressionType = visit(node.iterable); |
| |
| currentMask = _memberData.typeOfIteratorCurrent(node); |
| moveNextMask = _memberData.typeOfIteratorMoveNext(node); |
| |
| ConstructorEntity constructor = |
| _closedWorld.commonElements.streamIteratorConstructor; |
| |
| /// Synthesize a call to the [StreamIterator] constructor. |
| iteratorType = handleStaticInvoke(node, null, null, constructor, |
| new ArgumentsTypes([expressionType], null)); |
| } else { |
| TypeInformation expressionType = visit(node.iterable); |
| Selector iteratorSelector = Selectors.iterator; |
| AbstractValue iteratorMask = _memberData.typeOfIterator(node); |
| currentMask = _memberData.typeOfIteratorCurrent(node); |
| moveNextMask = _memberData.typeOfIteratorMoveNext(node); |
| |
| iteratorType = handleDynamicInvoke(CallType.forIn, node, iteratorSelector, |
| iteratorMask, expressionType, new ArgumentsTypes.empty()); |
| } |
| |
| handleDynamicInvoke(CallType.forIn, node, Selectors.moveNext, moveNextMask, |
| iteratorType, new ArgumentsTypes.empty()); |
| TypeInformation currentType = handleDynamicInvoke( |
| CallType.forIn, |
| node, |
| Selectors.current, |
| currentMask, |
| iteratorType, |
| new ArgumentsTypes.empty()); |
| |
| Local variable = _localsMap.getLocalVariable(node.variable); |
| DartType variableType = _localsMap.getLocalType(_elementMap, variable); |
| _state.updateLocal(_inferrer, _capturedAndBoxed, variable, currentType, |
| node.variable, variableType); |
| |
| JumpTarget target = _localsMap.getJumpTargetForForIn(node); |
| return handleLoop(node, target, () { |
| visit(node.body); |
| }); |
| } |
| |
| void _setupBreaksAndContinues(JumpTarget target) { |
| if (target == null) return; |
| if (target.isContinueTarget) { |
| _continuesFor[target] = <LocalState>[]; |
| } |
| if (target.isBreakTarget) { |
| _breaksFor[target] = <LocalState>[]; |
| } |
| } |
| |
| void _clearBreaksAndContinues(JumpTarget element) { |
| _continuesFor.remove(element); |
| _breaksFor.remove(element); |
| } |
| |
| List<LocalState> _getBreaks(JumpTarget target) { |
| List<LocalState> list = <LocalState>[_state]; |
| if (target == null) return list; |
| if (!target.isBreakTarget) return list; |
| return list..addAll(_breaksFor[target]); |
| } |
| |
| List<LocalState> _getLoopBackEdges(JumpTarget target) { |
| List<LocalState> list = <LocalState>[_state]; |
| if (target == null) return list; |
| if (!target.isContinueTarget) return list; |
| return list..addAll(_continuesFor[target]); |
| } |
| |
| TypeInformation handleLoop(ir.Node node, JumpTarget target, void logic()) { |
| _loopLevel++; |
| bool changed = false; |
| LocalState stateBefore = _state; |
| stateBefore.startLoop(_inferrer, node); |
| do { |
| // Setup (and clear in case of multiple iterations of the loop) |
| // the lists of breaks and continues seen in the loop. |
| _setupBreaksAndContinues(target); |
| _state = new LocalState.childPath(stateBefore); |
| logic(); |
| changed = stateBefore.mergeAll(_inferrer, _getLoopBackEdges(target)); |
| } while (changed); |
| _loopLevel--; |
| stateBefore.endLoop(_inferrer, node); |
| bool keepOwnLocals = node is! ir.DoStatement; |
| _state = stateBefore.mergeAfterBreaks(_inferrer, _getBreaks(target), |
| keepOwnLocals: keepOwnLocals); |
| _clearBreaksAndContinues(target); |
| return null; |
| } |
| |
| @override |
| TypeInformation visitConstructorInvocation(ir.ConstructorInvocation node) { |
| ConstructorEntity constructor = _elementMap.getConstructor(node.target); |
| ArgumentsTypes arguments = analyzeArguments(node.arguments); |
| Selector selector = _elementMap.getSelector(node); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| return handleConstructorInvoke( |
| node, node.arguments, selector, mask, constructor, arguments); |
| } |
| |
| /// Try to find the length given to a fixed array constructor call. |
| int _findLength(ir.Arguments arguments) { |
| int finish(int length) { |
| // Filter out lengths that should not be tracked. |
| if (length < 0) return null; |
| // Serialization limit. |
| if (length >= (1 << 30)) return null; |
| return length; |
| } |
| |
| ir.Expression firstArgument = arguments.positional.first; |
| if (firstArgument is ir.ConstantExpression && |
| firstArgument.constant is ir.DoubleConstant) { |
| ir.DoubleConstant constant = firstArgument.constant; |
| double doubleValue = constant.value; |
| int truncatedValue = doubleValue.truncate(); |
| if (doubleValue == truncatedValue) { |
| return finish(truncatedValue); |
| } |
| } else if (firstArgument is ir.IntLiteral) { |
| return finish(firstArgument.value); |
| } else if (firstArgument is ir.StaticGet) { |
| MemberEntity member = _elementMap.getMember(firstArgument.target); |
| if (member.isField) { |
| FieldAnalysisData fieldData = |
| _closedWorld.fieldAnalysis.getFieldData(member); |
| if (fieldData.isEffectivelyConstant && fieldData.constantValue.isInt) { |
| IntConstantValue intValue = fieldData.constantValue; |
| if (intValue.intValue.isValidInt) { |
| return finish(intValue.intValue.toInt()); |
| } |
| } |
| } |
| } |
| return null; |
| } |
| |
| /// Returns `true` if |
| bool _isConstructorOfTypedArraySubclass(ConstructorEntity constructor) { |
| ClassEntity cls = constructor.enclosingClass; |
| return cls.library.canonicalUri == Uris.dart__native_typed_data && |
| _closedWorld.nativeData.isNativeClass(cls) && |
| _closedWorld.classHierarchy |
| .isSubtypeOf(cls, _closedWorld.commonElements.typedDataClass) && |
| _closedWorld.classHierarchy |
| .isSubtypeOf(cls, _closedWorld.commonElements.listClass) && |
| constructor.name == ''; |
| } |
| |
| TypeInformation handleConstructorInvoke( |
| ir.Node node, |
| ir.Arguments arguments, |
| Selector selector, |
| AbstractValue mask, |
| ConstructorEntity constructor, |
| ArgumentsTypes argumentsTypes) { |
| TypeInformation returnType = |
| handleStaticInvoke(node, selector, mask, constructor, argumentsTypes); |
| if (_elementMap.commonElements.isUnnamedListConstructor(constructor)) { |
| // We have `new List(...)`. |
| if (arguments.positional.isEmpty && arguments.named.isEmpty) { |
| // We have `new List()`. |
| return _inferrer.concreteTypes.putIfAbsent( |
| node, |
| () => _types.allocateList(_types.growableListType, node, |
| _analyzedMember, _types.nonNullEmpty(), 0)); |
| } else { |
| // We have `new List(len)`. |
| int length = _findLength(arguments); |
| return _inferrer.concreteTypes.putIfAbsent( |
| node, |
| () => _types.allocateList(_types.fixedListType, node, |
| _analyzedMember, _types.nullType, length)); |
| } |
| } else if (_elementMap.commonElements |
| .isFilledListConstructor(constructor)) { |
| // We have `new Uint32List(len, fill)`. |
| int length = _findLength(arguments); |
| TypeInformation elementType = argumentsTypes.positional[1]; |
| |
| return _inferrer.concreteTypes.putIfAbsent( |
| node, |
| () => _types.allocateList(_types.fixedListType, node, _analyzedMember, |
| elementType, length)); |
| } else if (_isConstructorOfTypedArraySubclass(constructor)) { |
| // We have something like `new List.filled(len, fill)`. |
| int length = _findLength(arguments); |
| MemberEntity member = _elementMap.elementEnvironment |
| .lookupClassMember(constructor.enclosingClass, '[]'); |
| TypeInformation elementType = _inferrer.returnTypeOfMember(member); |
| return _inferrer.concreteTypes.putIfAbsent( |
| node, |
| () => _types.allocateList( |
| _types.nonNullExact(constructor.enclosingClass), |
| node, |
| _analyzedMember, |
| elementType, |
| length)); |
| } else { |
| return returnType; |
| } |
| } |
| |
| TypeInformation handleStaticInvoke(ir.Node node, Selector selector, |
| AbstractValue mask, MemberEntity element, ArgumentsTypes arguments) { |
| return _inferrer.registerCalledMember(node, selector, mask, _analyzedMember, |
| element, arguments, _sideEffectsBuilder, inLoop); |
| } |
| |
| TypeInformation handleClosureCall(ir.Node node, Selector selector, |
| AbstractValue mask, MemberEntity member, ArgumentsTypes arguments) { |
| return _inferrer.registerCalledClosure( |
| node, |
| selector, |
| mask, |
| _inferrer.typeOfMember(member), |
| _analyzedMember, |
| arguments, |
| _sideEffectsBuilder, |
| inLoop: inLoop); |
| } |
| |
| TypeInformation handleForeignInvoke( |
| ir.StaticInvocation node, |
| FunctionEntity function, |
| ArgumentsTypes arguments, |
| Selector selector, |
| AbstractValue mask) { |
| String name = function.name; |
| handleStaticInvoke(node, selector, mask, function, arguments); |
| if (name == Identifiers.JS) { |
| NativeBehavior nativeBehavior = |
| _elementMap.getNativeBehaviorForJsCall(node); |
| _sideEffectsBuilder.add(nativeBehavior.sideEffects); |
| return _inferrer.typeOfNativeBehavior(nativeBehavior); |
| } else if (name == Identifiers.JS_EMBEDDED_GLOBAL) { |
| NativeBehavior nativeBehavior = |
| _elementMap.getNativeBehaviorForJsEmbeddedGlobalCall(node); |
| _sideEffectsBuilder.add(nativeBehavior.sideEffects); |
| return _inferrer.typeOfNativeBehavior(nativeBehavior); |
| } else if (name == Identifiers.JS_BUILTIN) { |
| NativeBehavior nativeBehavior = |
| _elementMap.getNativeBehaviorForJsBuiltinCall(node); |
| _sideEffectsBuilder.add(nativeBehavior.sideEffects); |
| return _inferrer.typeOfNativeBehavior(nativeBehavior); |
| } else if (name == Identifiers.JS_STRING_CONCAT) { |
| return _types.stringType; |
| } else { |
| _sideEffectsBuilder.setAllSideEffects(); |
| return _types.dynamicType; |
| } |
| } |
| |
| @override |
| TypeInformation visitStaticInvocation(ir.StaticInvocation node) { |
| MemberEntity member = _elementMap.getMember(node.target); |
| ArgumentsTypes arguments = analyzeArguments(node.arguments); |
| Selector selector = _elementMap.getSelector(node); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| if (_closedWorld.commonElements.isForeign(member)) { |
| return handleForeignInvoke(node, member, arguments, selector, mask); |
| } else if (member.isConstructor) { |
| return handleConstructorInvoke( |
| node, node.arguments, selector, mask, member, arguments); |
| } else { |
| assert(member.isFunction, "Unexpected static invocation target: $member"); |
| TypeInformation type = |
| handleStaticInvoke(node, selector, mask, member, arguments); |
| FunctionType functionType = |
| _elementMap.elementEnvironment.getFunctionType(member); |
| if (functionType.returnType.containsFreeTypeVariables) { |
| // The return type varies with the call site so we narrow the static |
| // return type. |
| type = _types.narrowType(type, _getStaticType(node)); |
| } |
| return type; |
| } |
| } |
| |
| @override |
| TypeInformation visitLoadLibrary(ir.LoadLibrary node) { |
| // TODO(johnniwinther): Improve this by returning a Future type instead. |
| return _types.dynamicType; |
| } |
| |
| @override |
| TypeInformation visitStaticGet(ir.StaticGet node) { |
| AbstractValue mask = _memberData.typeOfSend(node); |
| assert(mask == null); |
| return createStaticGetTypeInformation(node, node.target, mask: mask); |
| } |
| |
| TypeInformation createStaticGetTypeInformation(ir.Node node, ir.Member target, |
| {AbstractValue mask}) { |
| MemberEntity member = _elementMap.getMember(target); |
| return handleStaticInvoke( |
| node, new Selector.getter(member.memberName), mask, member, null); |
| } |
| |
| @override |
| TypeInformation visitStaticSet(ir.StaticSet node) { |
| TypeInformation rhsType = visit(node.value); |
| if (node.value is ir.ThisExpression) { |
| _state.markThisAsExposed(); |
| } |
| MemberEntity member = _elementMap.getMember(node.target); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| handleStaticInvoke(node, new Selector.setter(member.memberName), mask, |
| member, new ArgumentsTypes([rhsType], null)); |
| return rhsType; |
| } |
| |
| TypeInformation handlePropertyGet( |
| ir.TreeNode node, TypeInformation receiverType, ir.Member interfaceTarget, |
| {bool isThis}) { |
| Selector selector = _elementMap.getSelector(node); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| if (isThis) { |
| _checkIfExposesThis( |
| selector, _types.newTypedSelector(receiverType, mask)); |
| } |
| TypeInformation type = handleDynamicGet(node, selector, mask, receiverType); |
| if (interfaceTarget != null) { |
| // Pull the type from kernel (instead of from the J-model) because the |
| // interface target might be abstract and therefore not part of the |
| // J-model. |
| ir.DartType resultType = interfaceTarget.getterType; |
| // The result type varies with the call site so we narrow the static |
| // result type. |
| if (containsFreeVariables(resultType)) { |
| type = _types.narrowType(type, _getStaticType(node)); |
| } |
| } |
| return type; |
| } |
| |
| @override |
| TypeInformation visitPropertyGet(ir.PropertyGet node) { |
| TypeInformation receiverType = visit(node.receiver); |
| return handlePropertyGet(node, receiverType, node.interfaceTarget, |
| isThis: node.receiver is ir.ThisExpression); |
| } |
| |
| @override |
| TypeInformation visitDirectPropertyGet(ir.DirectPropertyGet node) { |
| TypeInformation receiverType = thisType; |
| return handlePropertyGet(node, receiverType, node.target, isThis: true); |
| } |
| |
| @override |
| TypeInformation visitPropertySet(ir.PropertySet node) { |
| TypeInformation receiverType = visit(node.receiver); |
| Selector selector = _elementMap.getSelector(node); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| |
| TypeInformation rhsType = visit(node.value); |
| if (node.value is ir.ThisExpression) { |
| _state.markThisAsExposed(); |
| } |
| |
| if (_inGenerativeConstructor && node.receiver is ir.ThisExpression) { |
| AbstractValue typedMask = _types.newTypedSelector(receiverType, mask); |
| if (!_closedWorld.includesClosureCall(selector, typedMask)) { |
| Iterable<MemberEntity> targets = |
| _closedWorld.locateMembers(selector, typedMask); |
| // We just recognized a field initialization of the form: |
| // `this.foo = 42`. If there is only one target, we can update |
| // its type. |
| if (targets.length == 1) { |
| MemberEntity single = targets.first; |
| if (single.isField) { |
| FieldEntity field = single; |
| _state.updateField(field, rhsType); |
| } |
| } |
| } |
| } |
| if (node.receiver is ir.ThisExpression) { |
| _checkIfExposesThis( |
| selector, _types.newTypedSelector(receiverType, mask)); |
| } |
| handleDynamicSet(node, selector, mask, receiverType, rhsType); |
| return rhsType; |
| } |
| |
| @override |
| TypeInformation visitThisExpression(ir.ThisExpression node) { |
| return thisType; |
| } |
| |
| void handleCondition(ir.Node node) { |
| bool oldAccumulateIsChecks = _accumulateIsChecks; |
| _accumulateIsChecks = true; |
| visit(node, conditionContext: true); |
| _accumulateIsChecks = oldAccumulateIsChecks; |
| } |
| |
| void _potentiallyAddIsCheck(ir.IsExpression node) { |
| if (!_accumulateIsChecks) return; |
| ir.Expression operand = node.operand; |
| if (operand is ir.VariableGet) { |
| Local local = _localsMap.getLocalVariable(operand.variable); |
| DartType type = _elementMap.getDartType(node.type); |
| LocalState stateAfterCheckWhenTrue = new LocalState.childPath(_state); |
| LocalState stateAfterCheckWhenFalse = new LocalState.childPath(_state); |
| stateAfterCheckWhenTrue.narrowLocal( |
| _inferrer, _capturedAndBoxed, local, type, node); |
| _setStateAfter(_state, stateAfterCheckWhenTrue, stateAfterCheckWhenFalse); |
| } |
| } |
| |
| void _potentiallyAddNullCheck( |
| ir.MethodInvocation node, ir.Expression receiver) { |
| if (!_accumulateIsChecks) return; |
| if (receiver is ir.VariableGet) { |
| Local local = _localsMap.getLocalVariable(receiver.variable); |
| DartType localType = _localsMap.getLocalType(_elementMap, local); |
| LocalState stateAfterCheckWhenTrue = new LocalState.childPath(_state); |
| LocalState stateAfterCheckWhenFalse = new LocalState.childPath(_state); |
| stateAfterCheckWhenTrue.updateLocal(_inferrer, _capturedAndBoxed, local, |
| _types.nullType, node, localType); |
| stateAfterCheckWhenFalse.narrowLocal(_inferrer, _capturedAndBoxed, local, |
| _closedWorld.commonElements.objectType, node); |
| _setStateAfter(_state, stateAfterCheckWhenTrue, stateAfterCheckWhenFalse); |
| } |
| } |
| |
| @override |
| TypeInformation visitIfStatement(ir.IfStatement node) { |
| LocalState stateBefore = _state; |
| handleCondition(node.condition); |
| LocalState stateAfterConditionWhenTrue = _stateAfterWhenTrue; |
| LocalState stateAfterConditionWhenFalse = _stateAfterWhenFalse; |
| _state = new LocalState.childPath(stateAfterConditionWhenTrue); |
| visit(node.then); |
| LocalState stateAfterThen = _state; |
| _state = new LocalState.childPath(stateAfterConditionWhenFalse); |
| visit(node.otherwise); |
| LocalState stateAfterElse = _state; |
| _state = |
| stateBefore.mergeDiamondFlow(_inferrer, stateAfterThen, stateAfterElse); |
| return null; |
| } |
| |
| @override |
| TypeInformation visitIsExpression(ir.IsExpression node) { |
| visit(node.operand); |
| _potentiallyAddIsCheck(node); |
| return _types.boolType; |
| } |
| |
| @override |
| TypeInformation visitNot(ir.Not node) { |
| visit(node.operand, conditionContext: _accumulateIsChecks); |
| LocalState stateAfterOperandWhenTrue = _stateAfterWhenTrue; |
| LocalState stateAfterOperandWhenFalse = _stateAfterWhenFalse; |
| _setStateAfter( |
| _state, stateAfterOperandWhenFalse, stateAfterOperandWhenTrue); |
| return _types.boolType; |
| } |
| |
| @override |
| TypeInformation visitLogicalExpression(ir.LogicalExpression node) { |
| if (node.operator == '&&') { |
| LocalState stateBefore = _state; |
| _state = new LocalState.childPath(stateBefore); |
| handleCondition(node.left); |
| LocalState stateAfterLeftWhenTrue = _stateAfterWhenTrue; |
| LocalState stateAfterLeftWhenFalse = _stateAfterWhenFalse; |
| _state = new LocalState.childPath(stateAfterLeftWhenTrue); |
| handleCondition(node.right); |
| LocalState stateAfterRightWhenTrue = _stateAfterWhenTrue; |
| LocalState stateAfterRightWhenFalse = _stateAfterWhenFalse; |
| LocalState stateAfterWhenTrue = stateAfterRightWhenTrue; |
| LocalState stateAfterWhenFalse = new LocalState.childPath(stateBefore) |
| .mergeDiamondFlow( |
| _inferrer, stateAfterLeftWhenFalse, stateAfterRightWhenFalse); |
| LocalState after = stateBefore.mergeDiamondFlow( |
| _inferrer, stateAfterWhenTrue, stateAfterWhenFalse); |
| _setStateAfter(after, stateAfterWhenTrue, stateAfterWhenFalse); |
| return _types.boolType; |
| } else if (node.operator == '||') { |
| LocalState stateBefore = _state; |
| _state = new LocalState.childPath(stateBefore); |
| handleCondition(node.left); |
| LocalState stateAfterLeftWhenTrue = _stateAfterWhenTrue; |
| LocalState stateAfterLeftWhenFalse = _stateAfterWhenFalse; |
| _state = new LocalState.childPath(stateAfterLeftWhenFalse); |
| handleCondition(node.right); |
| LocalState stateAfterRightWhenTrue = _stateAfterWhenTrue; |
| LocalState stateAfterRightWhenFalse = _stateAfterWhenFalse; |
| LocalState stateAfterWhenTrue = new LocalState.childPath(stateBefore) |
| .mergeDiamondFlow( |
| _inferrer, stateAfterLeftWhenTrue, stateAfterRightWhenTrue); |
| LocalState stateAfterWhenFalse = stateAfterRightWhenFalse; |
| LocalState stateAfter = stateBefore.mergeDiamondFlow( |
| _inferrer, stateAfterWhenTrue, stateAfterWhenFalse); |
| _setStateAfter(stateAfter, stateAfterWhenTrue, stateAfterWhenFalse); |
| return _types.boolType; |
| } |
| failedAt(CURRENT_ELEMENT_SPANNABLE, |
| "Unexpected logical operator '${node.operator}'."); |
| return null; |
| } |
| |
| @override |
| TypeInformation visitConditionalExpression(ir.ConditionalExpression node) { |
| LocalState stateBefore = _state; |
| handleCondition(node.condition); |
| LocalState stateAfterWhenTrue = _stateAfterWhenTrue; |
| LocalState stateAfterWhenFalse = _stateAfterWhenFalse; |
| _state = new LocalState.childPath(stateAfterWhenTrue); |
| TypeInformation firstType = visit(node.then); |
| LocalState stateAfterThen = _state; |
| _state = new LocalState.childPath(stateAfterWhenFalse); |
| TypeInformation secondType = visit(node.otherwise); |
| LocalState stateAfterElse = _state; |
| _state = |
| stateBefore.mergeDiamondFlow(_inferrer, stateAfterThen, stateAfterElse); |
| return _types.allocateDiamondPhi(firstType, secondType); |
| } |
| |
| TypeInformation handleLocalFunction( |
| ir.TreeNode node, ir.FunctionNode functionNode, |
| [ir.VariableDeclaration variable]) { |
| // We loose track of [this] in closures (see issue 20840). To be on |
| // the safe side, we mark [this] as exposed here. We could do better by |
| // analyzing the closure. |
| // TODO(herhut): Analyze whether closure exposes this. Possibly using |
| // whether the created closure as a `thisLocal`. |
| _state.markThisAsExposed(); |
| |
| ClosureRepresentationInfo info = _closureDataLookup.getClosureInfo(node); |
| |
| // Record the types of captured non-boxed variables. Types of |
| // these variables may already be there, because of an analysis of |
| // a previous closure. |
| info.forEachFreeVariable((Local variable, FieldEntity field) { |
| if (!info.isBoxedVariable(variable)) { |
| if (variable == info.thisLocal) { |
| _inferrer.recordTypeOfField(field, thisType); |
| } |
| TypeInformation localType = |
| _state.readLocal(_inferrer, _capturedAndBoxed, variable); |
| // The type is null for type parameters. |
| if (localType != null) { |
| _inferrer.recordTypeOfField(field, localType); |
| } |
| } |
| _capturedVariables.add(variable); |
| }); |
| |
| TypeInformation localFunctionType = |
| _inferrer.concreteTypes.putIfAbsent(node, () { |
| return _types.allocateClosure(info.callMethod); |
| }); |
| if (variable != null) { |
| Local local = _localsMap.getLocalVariable(variable); |
| DartType type = _localsMap.getLocalType(_elementMap, local); |
| _state.updateLocal( |
| _inferrer, _capturedAndBoxed, local, localFunctionType, node, type, |
| isNullable: false); |
| } |
| |
| // We don't put the closure in the work queue of the |
| // inferrer, because it will share information with its enclosing |
| // method, like for example the types of local variables. |
| LocalState closureState = new LocalState.closure(_state); |
| KernelTypeGraphBuilder visitor = new KernelTypeGraphBuilder( |
| _options, |
| _closedWorld, |
| _inferrer, |
| info.callMethod, |
| functionNode, |
| _localsMap, |
| _staticTypeProvider, |
| closureState, |
| _capturedAndBoxed); |
| visitor.run(); |
| _inferrer.recordReturnType(info.callMethod, visitor._returnType); |
| |
| return localFunctionType; |
| } |
| |
| @override |
| TypeInformation visitFunctionDeclaration(ir.FunctionDeclaration node) { |
| return handleLocalFunction(node, node.function, node.variable); |
| } |
| |
| @override |
| TypeInformation visitFunctionExpression(ir.FunctionExpression node) { |
| return handleLocalFunction(node, node.function); |
| } |
| |
| @override |
| visitWhileStatement(ir.WhileStatement node) { |
| return handleLoop(node, _localsMap.getJumpTargetForWhile(node), () { |
| handleCondition(node.condition); |
| _state = new LocalState.childPath(_stateAfterWhenTrue); |
| visit(node.body); |
| }); |
| } |
| |
| @override |
| visitDoStatement(ir.DoStatement node) { |
| return handleLoop(node, _localsMap.getJumpTargetForDo(node), () { |
| visit(node.body); |
| handleCondition(node.condition); |
| // TODO(29309): This condition appears to strengthen both the back-edge |
| // and exit-edge. For now, avoid strengthening on the condition until the |
| // proper fix is found. |
| // |
| // _state = new LocalState.childPath(_stateAfterWhenTrue, node.body); |
| }); |
| } |
| |
| @override |
| visitForStatement(ir.ForStatement node) { |
| for (ir.VariableDeclaration variable in node.variables) { |
| visit(variable); |
| } |
| return handleLoop(node, _localsMap.getJumpTargetForFor(node), () { |
| handleCondition(node.condition); |
| _state = new LocalState.childPath(_stateAfterWhenTrue); |
| visit(node.body); |
| for (ir.Expression update in node.updates) { |
| visit(update); |
| } |
| }); |
| } |
| |
| @override |
| visitTryCatch(ir.TryCatch node) { |
| LocalState stateBefore = _state; |
| _state = new LocalState.tryBlock(stateBefore, node); |
| _state.markInitializationAsIndefinite(); |
| visit(node.body); |
| LocalState stateAfterBody = _state; |
| _state = stateBefore.mergeFlow(_inferrer, stateAfterBody); |
| for (ir.Catch catchBlock in node.catches) { |
| LocalState stateBeforeCatch = _state; |
| _state = new LocalState.childPath(stateBeforeCatch); |
| visit(catchBlock); |
| LocalState stateAfterCatch = _state; |
| _state = stateBeforeCatch.mergeFlow(_inferrer, stateAfterCatch); |
| } |
| return null; |
| } |
| |
| @override |
| visitTryFinally(ir.TryFinally node) { |
| LocalState stateBefore = _state; |
| _state = new LocalState.tryBlock(stateBefore, node); |
| _state.markInitializationAsIndefinite(); |
| visit(node.body); |
| LocalState stateAfterBody = _state; |
| _state = stateBefore.mergeFlow(_inferrer, stateAfterBody); |
| visit(node.finalizer); |
| return null; |
| } |
| |
| @override |
| visitCatch(ir.Catch node) { |
| ir.VariableDeclaration exception = node.exception; |
| if (exception != null) { |
| TypeInformation mask; |
| DartType type = node.guard != null |
| ? _elementMap.getDartType(node.guard) |
| : const DynamicType(); |
| if (type.isInterfaceType) { |
| InterfaceType interfaceType = type; |
| mask = _types.nonNullSubtype(interfaceType.element); |
| } else { |
| mask = _types.dynamicType; |
| } |
| Local local = _localsMap.getLocalVariable(exception); |
| _state.updateLocal( |
| _inferrer, _capturedAndBoxed, local, mask, node, const DynamicType(), |
| isNullable: false /* `throw null` produces a NullThrownError */); |
| } |
| ir.VariableDeclaration stackTrace = node.stackTrace; |
| if (stackTrace != null) { |
| Local local = _localsMap.getLocalVariable(stackTrace); |
| // TODO(johnniwinther): Use a mask based on [StackTrace]. |
| // Note: stack trace may be null if users omit a stack in |
| // `completer.completeError`. |
| _state.updateLocal(_inferrer, _capturedAndBoxed, local, |
| _types.dynamicType, node, const DynamicType()); |
| } |
| visit(node.body); |
| return null; |
| } |
| |
| @override |
| TypeInformation visitThrow(ir.Throw node) { |
| visit(node.expression); |
| _state.seenReturnOrThrow = true; |
| return _types.nonNullEmpty(); |
| } |
| |
| @override |
| TypeInformation visitRethrow(ir.Rethrow node) { |
| _state.seenReturnOrThrow = true; |
| return _types.nonNullEmpty(); |
| } |
| |
| TypeInformation handleSuperNoSuchMethod(ir.Node node, Selector selector, |
| AbstractValue mask, ArgumentsTypes arguments) { |
| // Ensure we create a node, to make explicit the call to the |
| // `noSuchMethod` handler. |
| FunctionEntity noSuchMethod = |
| _elementMap.getSuperNoSuchMethod(_analyzedMember.enclosingClass); |
| return handleStaticInvoke(node, selector, mask, noSuchMethod, arguments); |
| } |
| |
| @override |
| TypeInformation visitSuperPropertyGet(ir.SuperPropertyGet node) { |
| // TODO(herhut): We could do better here if we knew what we |
| // are calling does not expose this. |
| _state.markThisAsExposed(); |
| |
| MemberEntity member = |
| _elementMap.getSuperMember(_analyzedMember, node.name); |
| assert(member != null, "No member found for super property get: $node"); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| Selector selector = new Selector.getter(_elementMap.getName(node.name)); |
| TypeInformation type = |
| handleStaticInvoke(node, selector, mask, member, null); |
| if (member.isGetter) { |
| FunctionType functionType = |
| _elementMap.elementEnvironment.getFunctionType(member); |
| if (functionType.returnType.containsFreeTypeVariables) { |
| // The result type varies with the call site so we narrow the static |
| // result type. |
| type = _types.narrowType(type, _getStaticType(node)); |
| } |
| } else if (member.isField) { |
| DartType fieldType = _elementMap.elementEnvironment.getFieldType(member); |
| if (fieldType.containsFreeTypeVariables) { |
| // The result type varies with the call site so we narrow the static |
| // result type. |
| type = _types.narrowType(type, _getStaticType(node)); |
| } |
| } |
| return type; |
| } |
| |
| @override |
| TypeInformation visitSuperPropertySet(ir.SuperPropertySet node) { |
| // TODO(herhut): We could do better here if we knew what we |
| // are calling does not expose this. |
| _state.markThisAsExposed(); |
| |
| TypeInformation rhsType = visit(node.value); |
| MemberEntity member = |
| _elementMap.getSuperMember(_analyzedMember, node.name, setter: true); |
| assert(member != null, "No member found for super property set: $node"); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| Selector selector = new Selector.setter(_elementMap.getName(node.name)); |
| ArgumentsTypes arguments = new ArgumentsTypes([rhsType], null); |
| handleStaticInvoke(node, selector, mask, member, arguments); |
| return rhsType; |
| } |
| |
| @override |
| TypeInformation visitSuperMethodInvocation(ir.SuperMethodInvocation node) { |
| // TODO(herhut): We could do better here if we knew what we |
| // are calling does not expose this. |
| _state.markThisAsExposed(); |
| |
| MemberEntity member = |
| _elementMap.getSuperMember(_analyzedMember, node.name); |
| ArgumentsTypes arguments = analyzeArguments(node.arguments); |
| Selector selector = _elementMap.getSelector(node); |
| AbstractValue mask = _memberData.typeOfSend(node); |
| if (member == null) { |
| // TODO(johnniwinther): This shouldn't be necessary. |
| return handleSuperNoSuchMethod(node, selector, mask, arguments); |
| } else { |
| assert(member.isFunction, "Unexpected super invocation target: $member"); |
| if (isIncompatibleInvoke(member, arguments)) { |
| return handleSuperNoSuchMethod(node, selector, mask, arguments); |
| } else { |
| TypeInformation type = |
| handleStaticInvoke(node, selector, mask, member, arguments); |
| FunctionType functionType = |
| _elementMap.elementEnvironment.getFunctionType(member); |
| if (functionType.returnType.containsFreeTypeVariables) { |
| // The return type varies with the call site so we narrow the static |
| // return type. |
| type = _types.narrowType(type, _getStaticType(node)); |
| } |
| return type; |
| } |
| } |
| } |
| |
| @override |
| TypeInformation visitAsExpression(ir.AsExpression node) { |
| TypeInformation operandType = visit(node.operand); |
| return _types.narrowType(operandType, _elementMap.getDartType(node.type)); |
| } |
| |
| @override |
| TypeInformation visitAwaitExpression(ir.AwaitExpression node) { |
| TypeInformation futureType = visit(node.operand); |
| return _inferrer.registerAwait(node, futureType); |
| } |
| |
| @override |
| TypeInformation visitYieldStatement(ir.YieldStatement node) { |
| TypeInformation operandType = visit(node.expression); |
| return _inferrer.registerYield(node, operandType); |
| } |
| |
| @override |
| TypeInformation visitCheckLibraryIsLoaded(ir.CheckLibraryIsLoaded node) { |
| return _types.nonNullEmpty(); |
| } |
| |
| @override |
| TypeInformation visitInvalidExpression(ir.InvalidExpression node) { |
| // TODO(johnniwinther): Maybe this should be [empty] instead? |
| return _types.dynamicType; |
| } |
| |
| @override |
| TypeInformation visitConstantExpression(ir.ConstantExpression node) { |
| return new TypeInformationConstantVisitor(this, node) |
| .visitConstant(node.constant); |
| } |
| } |
| |
| class TypeInformationConstantVisitor |
| extends ir.ComputeOnceConstantVisitor<TypeInformation> { |
| final KernelTypeGraphBuilder builder; |
| final ir.ConstantExpression expression; |
| |
| TypeInformationConstantVisitor(this.builder, this.expression); |
| |
| @override |
| TypeInformation defaultConstant(ir.Constant node) { |
| throw new UnsupportedError("Unexpected constant: " |
| "${node} (${node.runtimeType})"); |
| } |
| |
| @override |
| TypeInformation visitNullConstant(ir.NullConstant node) { |
| return builder.createNullTypeInformation(); |
| } |
| |
| @override |
| TypeInformation visitBoolConstant(ir.BoolConstant node) { |
| return builder.createBoolTypeInformation(node.value); |
| } |
| |
| @override |
| TypeInformation visitIntConstant(ir.IntConstant node) { |
| return builder.createIntTypeInformation(node.value); |
| } |
| |
| @override |
| TypeInformation visitDoubleConstant(ir.DoubleConstant node) { |
| return builder.createDoubleTypeInformation(node.value); |
| } |
| |
| @override |
| TypeInformation visitStringConstant(ir.StringConstant node) { |
| return builder.createStringTypeInformation(node.value); |
| } |
| |
| @override |
| TypeInformation visitSymbolConstant(ir.SymbolConstant node) { |
| return builder.createSymbolLiteralTypeInformation(); |
| } |
| |
| @override |
| TypeInformation visitMapConstant(ir.MapConstant node) { |
| return builder.createMapTypeInformation( |
| new ConstantReference(expression, node), |
| node.entries |
| .map((e) => new Pair(visitConstant(e.key), visitConstant(e.value))), |
| isConst: true); |
| } |
| |
| @override |
| TypeInformation visitListConstant(ir.ListConstant node) { |
| return builder.createListTypeInformation( |
| new ConstantReference(expression, node), |
| node.entries.map((e) => visitConstant(e)), |
| isConst: true); |
| } |
| |
| @override |
| TypeInformation visitSetConstant(ir.SetConstant node) { |
| return builder.createSetTypeInformation( |
| new ConstantReference(expression, node), |
| node.entries.map((e) => visitConstant(e)), |
| isConst: true); |
| } |
| |
| @override |
| TypeInformation visitInstanceConstant(ir.InstanceConstant node) { |
| node.fieldValues.forEach((ir.Reference reference, ir.Constant value) { |
| builder._inferrer.recordTypeOfField( |
| builder._elementMap.getField(reference.asField), |
| visitConstant(value)); |
| }); |
| return builder._types.getConcreteTypeFor(builder |
| ._closedWorld.abstractValueDomain |
| .createNonNullExact(builder._elementMap.getClass(node.classNode))); |
| } |
| |
| @override |
| TypeInformation visitPartialInstantiationConstant( |
| ir.PartialInstantiationConstant node) { |
| return builder.createInstantiationTypeInformation( |
| visitConstant(node.tearOffConstant)); |
| } |
| |
| @override |
| TypeInformation visitTearOffConstant(ir.TearOffConstant node) { |
| return builder.createStaticGetTypeInformation(node, node.procedure); |
| } |
| |
| @override |
| TypeInformation visitTypeLiteralConstant(ir.TypeLiteralConstant node) { |
| return builder.createTypeLiteralInformation(); |
| } |
| |
| @override |
| TypeInformation visitUnevaluatedConstant(ir.UnevaluatedConstant node) { |
| assert(false, "Unexpected unevaluated constant: $node"); |
| return builder._types.dynamicType; |
| } |
| } |
| |
| class Refinement { |
| final Selector selector; |
| final AbstractValue mask; |
| |
| Refinement(this.selector, this.mask); |
| } |
| |
| class LocalState { |
| final LocalsHandler _locals; |
| final FieldInitializationScope _fields; |
| bool seenReturnOrThrow = false; |
| bool seenBreakOrContinue = false; |
| LocalsHandler _tryBlock; |
| |
| LocalState.initial({bool inGenerativeConstructor}) |
| : this.internal( |
| new LocalsHandler(), |
| inGenerativeConstructor ? new FieldInitializationScope() : null, |
| null, |
| seenReturnOrThrow: false, |
| seenBreakOrContinue: false); |
| |
| LocalState.childPath(LocalState other) |
| : this.internal(new LocalsHandler.from(other._locals), |
| new FieldInitializationScope.from(other._fields), other._tryBlock, |
| seenReturnOrThrow: false, seenBreakOrContinue: false); |
| |
| LocalState.closure(LocalState other) |
| : this.internal(new LocalsHandler.from(other._locals), |
| new FieldInitializationScope.from(other._fields), null, |
| seenReturnOrThrow: false, seenBreakOrContinue: false); |
| |
| factory LocalState.tryBlock(LocalState other, ir.TreeNode node) { |
| LocalsHandler locals = new LocalsHandler.tryBlock(other._locals, node); |
| FieldInitializationScope fieldScope = |
| new FieldInitializationScope.from(other._fields); |
| LocalsHandler tryBlock = locals; |
| return new LocalState.internal(locals, fieldScope, tryBlock, |
| seenReturnOrThrow: false, seenBreakOrContinue: false); |
| } |
| |
| LocalState.deepCopyOf(LocalState other) |
| : _locals = new LocalsHandler.deepCopyOf(other._locals), |
| _tryBlock = other._tryBlock, |
| _fields = other._fields; |
| |
| LocalState.internal(this._locals, this._fields, this._tryBlock, |
| {this.seenReturnOrThrow, this.seenBreakOrContinue}); |
| |
| bool get aborts { |
| return seenReturnOrThrow || seenBreakOrContinue; |
| } |
| |
| bool get isThisExposed { |
| return _fields == null || _fields.isThisExposed; |
| } |
| |
| void markThisAsExposed() { |
| _fields?.isThisExposed = true; |
| } |
| |
| void markInitializationAsIndefinite() { |
| _fields?.isIndefinite = true; |
| } |
| |
| TypeInformation readField(FieldEntity field) { |
| return _fields.readField(field); |
| } |
| |
| void updateField(FieldEntity field, TypeInformation type) { |
| _fields.updateField(field, type); |
| } |
| |
| TypeInformation readLocal(InferrerEngine inferrer, |
| Map<Local, FieldEntity> capturedAndBoxed, Local local) { |
| FieldEntity field = capturedAndBoxed[local]; |
| if (field != null) { |
| return inferrer.typeOfMember(field); |
| } else { |
| return _locals.use(inferrer, local); |
| } |
| } |
| |
| void updateLocal( |
| InferrerEngine inferrer, |
| Map<Local, FieldEntity> capturedAndBoxed, |
| Local local, |
| TypeInformation type, |
| ir.Node node, |
| DartType staticType, |
| {isNullable: true}) { |
| assert(type != null); |
| type = inferrer.types.narrowType(type, staticType, isNullable: isNullable); |
| |
| FieldEntity field = capturedAndBoxed[local]; |
| if (field != null) { |
| inferrer.recordTypeOfField(field, type); |
| } else { |
| _locals.update(inferrer, local, type, node, staticType, _tryBlock); |
| } |
| } |
| |
| void narrowLocal( |
| InferrerEngine inferrer, |
| Map<Local, FieldEntity> capturedAndBoxed, |
| Local local, |
| DartType type, |
| ir.Node node) { |
| TypeInformation currentType = readLocal(inferrer, capturedAndBoxed, local); |
| updateLocal(inferrer, capturedAndBoxed, local, currentType, node, type, |
| isNullable: false); |
| } |
| |
| LocalState mergeFlow(InferrerEngine inferrer, LocalState other) { |
| seenReturnOrThrow = false; |
| seenBreakOrContinue = false; |
| |
| if (other.aborts) { |
| return this; |
| } |
| LocalsHandler locals = _locals.mergeFlow(inferrer, other._locals); |
| return new LocalState.internal(locals, _fields, _tryBlock, |
| seenReturnOrThrow: seenReturnOrThrow, |
| seenBreakOrContinue: seenBreakOrContinue); |
| } |
| |
| LocalState mergeDiamondFlow( |
| InferrerEngine inferrer, LocalState thenBranch, LocalState elseBranch) { |
| seenReturnOrThrow = |
| thenBranch.seenReturnOrThrow && elseBranch.seenReturnOrThrow; |
| seenBreakOrContinue = |
| thenBranch.seenBreakOrContinue && elseBranch.seenBreakOrContinue; |
| |
| LocalsHandler locals; |
| if (aborts) { |
| locals = _locals; |
| } else if (thenBranch.aborts) { |
| locals = _locals.mergeFlow(inferrer, elseBranch._locals, inPlace: true); |
| } else if (elseBranch.aborts) { |
| locals = _locals.mergeFlow(inferrer, thenBranch._locals, inPlace: true); |
| } else { |
| locals = _locals.mergeDiamondFlow( |
| inferrer, thenBranch._locals, elseBranch._locals); |
| } |
| |
| FieldInitializationScope fieldScope = _fields?.mergeDiamondFlow( |
| inferrer, thenBranch._fields, elseBranch._fields); |
| return new LocalState.internal(locals, fieldScope, _tryBlock, |
| seenReturnOrThrow: seenReturnOrThrow, |
| seenBreakOrContinue: seenBreakOrContinue); |
| } |
| |
| LocalState mergeAfterBreaks(InferrerEngine inferrer, List<LocalState> states, |
| {bool keepOwnLocals: true}) { |
| bool allBranchesAbort = true; |
| for (LocalState state in states) { |
| allBranchesAbort = allBranchesAbort && state.seenReturnOrThrow; |
| } |
| |
| keepOwnLocals = keepOwnLocals && !seenReturnOrThrow; |
| |
| LocalsHandler locals = _locals.mergeAfterBreaks( |
| inferrer, |
| states |
| .where((LocalState state) => !state.seenReturnOrThrow) |
| .map((LocalState state) => state._locals), |
| keepOwnLocals: keepOwnLocals); |
| seenReturnOrThrow = allBranchesAbort && !keepOwnLocals; |
| return new LocalState.internal(locals, _fields, _tryBlock, |
| seenReturnOrThrow: seenReturnOrThrow, |
| seenBreakOrContinue: seenBreakOrContinue); |
| } |
| |
| bool mergeAll(InferrerEngine inferrer, List<LocalState> states) { |
| assert(!seenReturnOrThrow); |
| return _locals.mergeAll( |
| inferrer, |
| states |
| .where((LocalState state) => !state.seenReturnOrThrow) |
| .map((LocalState state) => state._locals)); |
| } |
| |
| void startLoop(InferrerEngine inferrer, ir.Node loop) { |
| _locals.startLoop(inferrer, loop); |
| } |
| |
| void endLoop(InferrerEngine inferrer, ir.Node loop) { |
| _locals.endLoop(inferrer, loop); |
| } |
| |
| String toStructuredText(String indent) { |
| StringBuffer sb = new StringBuffer(); |
| _toStructuredText(sb, indent); |
| return sb.toString(); |
| } |
| |
| void _toStructuredText(StringBuffer sb, String indent) { |
| sb.write('LocalState($hashCode) ['); |
| sb.write('\n${indent} locals:'); |
| sb.write(_locals.toStructuredText('${indent} ')); |
| sb.write('\n]'); |
| } |
| |
| @override |
| String toString() { |
| StringBuffer sb = new StringBuffer(); |
| sb.write('LocalState('); |
| sb.write('locals=$_locals'); |
| if (_fields != null) { |
| sb.write(',fields=$_fields'); |
| } |
| if (seenReturnOrThrow) { |
| sb.write(',seenReturnOrThrow'); |
| } |
| if (seenBreakOrContinue) { |
| sb.write(',seenBreakOrContinue'); |
| } |
| sb.write(')'); |
| return sb.toString(); |
| } |
| } |
