| // Copyright (c) 2019, 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'; |
| import 'package:kernel/class_hierarchy.dart'; |
| import 'package:kernel/type_algebra.dart'; |
| import 'package:kernel/type_environment.dart'; |
| |
| import '../builder/builder.dart'; |
| import '../builder/constructor_reference_builder.dart'; |
| import '../builder/declaration_builders.dart'; |
| import '../builder/formal_parameter_builder.dart'; |
| import '../builder/function_builder.dart'; |
| import '../builder/metadata_builder.dart'; |
| import '../builder/type_builder.dart'; |
| import '../codes/fasta_codes.dart'; |
| import '../dill/dill_extension_type_member_builder.dart'; |
| import '../dill/dill_member_builder.dart'; |
| import '../identifiers.dart'; |
| import '../kernel/body_builder_context.dart'; |
| import '../kernel/constructor_tearoff_lowering.dart'; |
| import '../kernel/hierarchy/class_member.dart'; |
| import '../kernel/kernel_helper.dart'; |
| import '../messages.dart' |
| show |
| messageConstFactoryRedirectionToNonConst, |
| noLength, |
| templateCyclicRedirectingFactoryConstructors, |
| templateIncompatibleRedirecteeFunctionType, |
| templateRedirectingFactoryIncompatibleTypeArgument, |
| templateTypeArgumentMismatch; |
| import '../problems.dart' show unexpected, unhandled; |
| import '../scope.dart'; |
| import '../type_inference/inference_helper.dart'; |
| import '../type_inference/type_inferrer.dart'; |
| import '../type_inference/type_schema.dart'; |
| import '../util/helpers.dart'; |
| import 'name_scheme.dart'; |
| import 'redirecting_factory_body.dart'; |
| import 'source_class_builder.dart'; |
| import 'source_function_builder.dart'; |
| import 'source_library_builder.dart' show SourceLibraryBuilder; |
| import 'source_loader.dart' show SourceLoader; |
| import 'source_member_builder.dart'; |
| |
| class SourceFactoryBuilder extends SourceFunctionBuilderImpl { |
| final int charOpenParenOffset; |
| |
| AsyncMarker actualAsyncModifier = AsyncMarker.Sync; |
| |
| @override |
| final bool isExtensionInstanceMember = false; |
| |
| @override |
| final TypeBuilder returnType; |
| |
| late final Procedure _procedureInternal; |
| late final Procedure? _factoryTearOff; |
| |
| SourceFactoryBuilder? actualOrigin; |
| |
| List<SourceFactoryBuilder>? _augmentations; |
| |
| final MemberName _memberName; |
| |
| DelayedDefaultValueCloner? _delayedDefaultValueCloner; |
| |
| SourceFactoryBuilder( |
| List<MetadataBuilder>? metadata, |
| int modifiers, |
| this.returnType, |
| String name, |
| List<NominalVariableBuilder> typeVariables, |
| List<FormalParameterBuilder>? formals, |
| SourceLibraryBuilder libraryBuilder, |
| int startCharOffset, |
| int charOffset, |
| this.charOpenParenOffset, |
| int charEndOffset, |
| Reference? procedureReference, |
| Reference? tearOffReference, |
| AsyncMarker asyncModifier, |
| NameScheme nameScheme, |
| {String? nativeMethodName}) |
| : _memberName = nameScheme.getDeclaredName(name), |
| super(metadata, modifiers, name, typeVariables, formals, libraryBuilder, |
| charOffset, nativeMethodName) { |
| _procedureInternal = new Procedure( |
| dummyName, |
| nameScheme.isExtensionTypeMember |
| ? ProcedureKind.Method |
| : ProcedureKind.Factory, |
| new FunctionNode(null), |
| fileUri: libraryBuilder.fileUri, |
| reference: procedureReference) |
| ..fileStartOffset = startCharOffset |
| ..fileOffset = charOffset |
| ..fileEndOffset = charEndOffset |
| ..isNonNullableByDefault = libraryBuilder.isNonNullableByDefault |
| ..isExtensionTypeMember = nameScheme.isExtensionTypeMember; |
| nameScheme |
| .getConstructorMemberName(name, isTearOff: false) |
| .attachMember(_procedureInternal); |
| _factoryTearOff = createFactoryTearOffProcedure( |
| nameScheme.getConstructorMemberName(name, isTearOff: true), |
| libraryBuilder, |
| libraryBuilder.fileUri, |
| charOffset, |
| tearOffReference, |
| forceCreateLowering: nameScheme.isExtensionTypeMember) |
| ?..isExtensionTypeMember = nameScheme.isExtensionTypeMember; |
| this.asyncModifier = asyncModifier; |
| } |
| |
| @override |
| Name get memberName => _memberName.name; |
| |
| @override |
| DeclarationBuilder get declarationBuilder => super.declarationBuilder!; |
| |
| List<SourceFactoryBuilder>? get augmentationsForTesting => _augmentations; |
| |
| @override |
| AsyncMarker get asyncModifier => actualAsyncModifier; |
| |
| @override |
| Statement? get body { |
| if (bodyInternal == null && !isAbstract && !isExternal) { |
| bodyInternal = new EmptyStatement(); |
| } |
| return bodyInternal; |
| } |
| |
| void set asyncModifier(AsyncMarker newModifier) { |
| actualAsyncModifier = newModifier; |
| function.asyncMarker = actualAsyncModifier; |
| function.dartAsyncMarker = actualAsyncModifier; |
| } |
| |
| @override |
| Member get member => _procedure; |
| |
| @override |
| SourceFactoryBuilder get origin => actualOrigin ?? this; |
| |
| @override |
| ProcedureKind get kind => ProcedureKind.Factory; |
| |
| Procedure get _procedure => |
| isAugmenting ? origin._procedure : _procedureInternal; |
| |
| @override |
| FunctionNode get function => _procedureInternal.function; |
| |
| @override |
| Member? get readTarget => origin._factoryTearOff ?? _procedure; |
| |
| @override |
| Member? get writeTarget => null; |
| |
| @override |
| Member? get invokeTarget => _procedure; |
| |
| @override |
| Iterable<Member> get exportedMembers => [_procedure]; |
| |
| @override |
| void buildOutlineNodes(BuildNodesCallback f) { |
| _build(); |
| f( |
| member: _procedureInternal, |
| tearOff: _factoryTearOff, |
| kind: isExtensionTypeMember |
| ? BuiltMemberKind.ExtensionTypeFactory |
| : BuiltMemberKind.Factory); |
| } |
| |
| void _build() { |
| buildFunction(); |
| _procedureInternal.function.fileOffset = charOpenParenOffset; |
| _procedureInternal.function.fileEndOffset = |
| _procedureInternal.fileEndOffset; |
| _procedureInternal.isAbstract = isAbstract; |
| _procedureInternal.isExternal = isExternal; |
| _procedureInternal.isConst = isConst; |
| _procedureInternal.isStatic = isStatic; |
| |
| if (_factoryTearOff != null) { |
| _delayedDefaultValueCloner = buildConstructorTearOffProcedure( |
| tearOff: _factoryTearOff, |
| declarationConstructor: _procedure, |
| implementationConstructor: _procedureInternal, |
| libraryBuilder: libraryBuilder); |
| } |
| } |
| |
| bool _hasBuiltOutlines = false; |
| |
| @override |
| void buildOutlineExpressions( |
| ClassHierarchy classHierarchy, |
| List<DelayedActionPerformer> delayedActionPerformers, |
| List<DelayedDefaultValueCloner> delayedDefaultValueCloners) { |
| if (_hasBuiltOutlines) return; |
| if (_delayedDefaultValueCloner != null) { |
| delayedDefaultValueCloners.add(_delayedDefaultValueCloner!); |
| } |
| super.buildOutlineExpressions( |
| classHierarchy, delayedActionPerformers, delayedDefaultValueCloners); |
| _hasBuiltOutlines = true; |
| } |
| |
| @override |
| VariableDeclaration? getTearOffParameter(int index) { |
| if (_factoryTearOff != null) { |
| if (index < _factoryTearOff.function.positionalParameters.length) { |
| return _factoryTearOff.function.positionalParameters[index]; |
| } else { |
| index -= _factoryTearOff.function.positionalParameters.length; |
| if (index < _factoryTearOff.function.namedParameters.length) { |
| return _factoryTearOff.function.namedParameters[index]; |
| } |
| } |
| } |
| return null; |
| } |
| |
| @override |
| List<ClassMember> get localMembers => |
| throw new UnsupportedError('${runtimeType}.localMembers'); |
| |
| @override |
| List<ClassMember> get localSetters => |
| throw new UnsupportedError('${runtimeType}.localSetters'); |
| |
| @override |
| void becomeNative(SourceLoader loader) { |
| _procedureInternal.isExternal = true; |
| super.becomeNative(loader); |
| } |
| |
| void setRedirectingFactoryBody(Member target, List<DartType> typeArguments) { |
| if (bodyInternal != null) { |
| unexpected("null", "${bodyInternal.runtimeType}", charOffset, fileUri); |
| } |
| bodyInternal = |
| createRedirectingFactoryBody(target, typeArguments, function); |
| _procedureInternal.function.body = bodyInternal; |
| _procedureInternal.function.redirectingFactoryTarget = |
| new RedirectingFactoryTarget(target, typeArguments); |
| bodyInternal?.parent = function; |
| if (isAugmenting) { |
| actualOrigin!.setRedirectingFactoryBody(target, typeArguments); |
| } |
| } |
| |
| @override |
| void applyAugmentation(Builder augmentation) { |
| if (augmentation is SourceFactoryBuilder) { |
| if (checkAugmentation(augmentation)) { |
| augmentation.actualOrigin = this; |
| (_augmentations ??= []).add(augmentation); |
| } |
| } else { |
| reportAugmentationMismatch(augmentation); |
| } |
| } |
| |
| void _finishAugmentation() { |
| finishProcedureAugmentation(origin._procedure, _procedureInternal); |
| |
| if (_factoryTearOff != null) { |
| finishProcedureAugmentation(origin._factoryTearOff!, _factoryTearOff); |
| } |
| } |
| |
| @override |
| int buildBodyNodes(BuildNodesCallback f) { |
| if (!isAugmenting) return 0; |
| _finishAugmentation(); |
| return 1; |
| } |
| |
| @override |
| void checkVariance( |
| SourceClassBuilder sourceClassBuilder, TypeEnvironment typeEnvironment) {} |
| |
| @override |
| void checkTypes( |
| SourceLibraryBuilder library, TypeEnvironment typeEnvironment) { |
| library.checkTypesInFunctionBuilder(this, typeEnvironment); |
| List<SourceFactoryBuilder>? augmentations = _augmentations; |
| if (augmentations != null) { |
| for (SourceFactoryBuilder augmentation in augmentations) { |
| augmentation.checkTypes(library, typeEnvironment); |
| } |
| } |
| } |
| |
| /// Checks the redirecting factories of this factory builder and its |
| /// augmentations. |
| void checkRedirectingFactories(TypeEnvironment typeEnvironment) { |
| _checkRedirectingFactory(typeEnvironment); |
| List<SourceFactoryBuilder>? augmentations = _augmentations; |
| if (augmentations != null) { |
| for (SourceFactoryBuilder augmentation in augmentations) { |
| augmentation._checkRedirectingFactory(typeEnvironment); |
| } |
| } |
| } |
| |
| /// Checks this factory builder if it is for a redirecting factory. |
| void _checkRedirectingFactory(TypeEnvironment typeEnvironment) {} |
| |
| @override |
| BodyBuilderContext get bodyBuilderContext => |
| new FactoryBodyBuilderContext(this); |
| |
| @override |
| String get fullNameForErrors { |
| return "${flattenName(declarationBuilder.name, charOffset, fileUri)}" |
| "${name.isEmpty ? '' : '.$name'}"; |
| } |
| |
| // TODO(johnniwinther): Add annotations to tear-offs. |
| @override |
| Iterable<Annotatable> get annotatables => [_procedure]; |
| |
| @override |
| bool get isAugmented { |
| if (isAugmenting) { |
| return origin._augmentations!.last != this; |
| } else { |
| return _augmentations != null; |
| } |
| } |
| } |
| |
| class RedirectingFactoryBuilder extends SourceFactoryBuilder { |
| final ConstructorReferenceBuilder redirectionTarget; |
| List<DartType>? typeArguments; |
| |
| FreshTypeParameters? _tearOffTypeParameters; |
| |
| bool _hasBeenCheckedAsRedirectingFactory = false; |
| |
| RedirectingFactoryBuilder( |
| List<MetadataBuilder>? metadata, |
| int modifiers, |
| TypeBuilder returnType, |
| String name, |
| List<NominalVariableBuilder> typeVariables, |
| List<FormalParameterBuilder>? formals, |
| SourceLibraryBuilder libraryBuilder, |
| int startCharOffset, |
| int charOffset, |
| int charOpenParenOffset, |
| int charEndOffset, |
| Reference? procedureReference, |
| Reference? tearOffReference, |
| NameScheme nameScheme, |
| String? nativeMethodName, |
| this.redirectionTarget) |
| : super( |
| metadata, |
| modifiers, |
| returnType, |
| name, |
| typeVariables, |
| formals, |
| libraryBuilder, |
| startCharOffset, |
| charOffset, |
| charOpenParenOffset, |
| charEndOffset, |
| procedureReference, |
| tearOffReference, |
| AsyncMarker.Sync, |
| nameScheme, |
| nativeMethodName: nativeMethodName); |
| |
| @override |
| Statement? get body => bodyInternal; |
| |
| @override |
| void setRedirectingFactoryBody(Member target, List<DartType> typeArguments) { |
| if (bodyInternal != null) { |
| unexpected("null", "${bodyInternal.runtimeType}", charOffset, fileUri); |
| } |
| |
| // Ensure that constant factories only have constant targets/bodies. |
| if (isConst && !target.isConst) { |
| libraryBuilder.addProblem(messageConstFactoryRedirectionToNonConst, |
| charOffset, noLength, fileUri); |
| } |
| |
| bodyInternal = |
| createRedirectingFactoryBody(target, typeArguments, function); |
| _procedureInternal.function.body = bodyInternal; |
| _procedureInternal.function.redirectingFactoryTarget = |
| new RedirectingFactoryTarget(target, typeArguments); |
| bodyInternal?.parent = function; |
| if (isAugmenting) { |
| if (function.typeParameters.isNotEmpty) { |
| Map<TypeParameter, DartType> substitution = <TypeParameter, DartType>{}; |
| for (int i = 0; i < function.typeParameters.length; i++) { |
| substitution[function.typeParameters[i]] = |
| new TypeParameterType.withDefaultNullabilityForLibrary( |
| actualOrigin!.function.typeParameters[i], |
| libraryBuilder.library); |
| } |
| typeArguments = new List<DartType>.generate(typeArguments.length, |
| (int i) => substitute(typeArguments[i], substitution), |
| growable: false); |
| } |
| actualOrigin!.setRedirectingFactoryBody(target, typeArguments); |
| } |
| } |
| |
| void setRedirectingFactoryError(String message) { |
| body = createRedirectingFactoryErrorBody(message); |
| _procedure.function.redirectingFactoryTarget = |
| new RedirectingFactoryTarget.error(message); |
| if (_factoryTearOff != null) { |
| _factoryTearOff.function.body = createRedirectingFactoryErrorBody(message) |
| ..parent = _factoryTearOff.function; |
| } |
| } |
| |
| @override |
| void buildOutlineNodes(BuildNodesCallback f) { |
| _build(); |
| f( |
| member: _procedureInternal, |
| tearOff: _factoryTearOff, |
| kind: isExtensionTypeMember |
| ? BuiltMemberKind.ExtensionTypeRedirectingFactory |
| : BuiltMemberKind.RedirectingFactory); |
| } |
| |
| @override |
| void _build() { |
| buildFunction(); |
| _procedureInternal.function.fileOffset = charOpenParenOffset; |
| _procedureInternal.function.fileEndOffset = |
| _procedureInternal.fileEndOffset; |
| _procedureInternal.isAbstract = isAbstract; |
| _procedureInternal.isExternal = isExternal; |
| _procedureInternal.isConst = isConst; |
| _procedureInternal.isStatic = isStatic; |
| if (redirectionTarget.typeArguments != null) { |
| typeArguments = new List<DartType>.generate( |
| redirectionTarget.typeArguments!.length, |
| (int i) => redirectionTarget.typeArguments![i] |
| .build(libraryBuilder, TypeUse.redirectionTypeArgument), |
| growable: false); |
| } |
| if (_factoryTearOff != null) { |
| _tearOffTypeParameters = |
| buildRedirectingFactoryTearOffProcedureParameters( |
| tearOff: _factoryTearOff, |
| implementationConstructor: _procedureInternal, |
| libraryBuilder: libraryBuilder); |
| } |
| } |
| |
| @override |
| bool _hasBuiltOutlines = false; |
| |
| @override |
| void buildOutlineExpressions( |
| ClassHierarchy classHierarchy, |
| List<DelayedActionPerformer> delayedActionPerformers, |
| List<DelayedDefaultValueCloner> delayedDefaultValueCloners) { |
| if (_hasBuiltOutlines) return; |
| if (isConst && isAugmenting) { |
| origin.buildOutlineExpressions( |
| classHierarchy, delayedActionPerformers, delayedDefaultValueCloners); |
| } |
| super.buildOutlineExpressions( |
| classHierarchy, delayedActionPerformers, delayedDefaultValueCloners); |
| |
| RedirectingFactoryTarget redirectingFactoryTarget = |
| _procedureInternal.function.redirectingFactoryTarget!; |
| List<DartType>? typeArguments = redirectingFactoryTarget.typeArguments; |
| Member? target = redirectingFactoryTarget.target; |
| if (typeArguments != null && typeArguments.any((t) => t is UnknownType)) { |
| TypeInferrer inferrer = libraryBuilder.loader.typeInferenceEngine |
| .createLocalTypeInferrer( |
| fileUri, declarationBuilder.thisType, libraryBuilder, null); |
| InferenceHelper helper = libraryBuilder.loader |
| .createBodyBuilderForOutlineExpression(libraryBuilder, |
| bodyBuilderContext, declarationBuilder.scope, fileUri); |
| Builder? targetBuilder = redirectionTarget.target; |
| if (targetBuilder is SourceMemberBuilder) { |
| // Ensure that target has been built. |
| targetBuilder.buildOutlineExpressions(classHierarchy, |
| delayedActionPerformers, delayedDefaultValueCloners); |
| } |
| if (targetBuilder is FunctionBuilder) { |
| target = targetBuilder.member; |
| } else if (targetBuilder is DillMemberBuilder) { |
| target = targetBuilder.member; |
| } else { |
| unhandled("${targetBuilder.runtimeType}", "buildOutlineExpressions", |
| charOffset, fileUri); |
| } |
| typeArguments = inferrer.inferRedirectingFactoryTypeArguments( |
| helper, |
| _procedureInternal.function.returnType, |
| _procedure.function, |
| charOffset, |
| target, |
| target.function!.computeFunctionType(Nullability.nonNullable)); |
| if (typeArguments == null) { |
| // Assume that the error is reported elsewhere, use 'dynamic' for |
| // recovery. |
| typeArguments = new List<DartType>.filled( |
| declarationBuilder.typeVariablesCount, const DynamicType(), |
| growable: true); |
| } |
| |
| _procedureInternal.function.body = |
| createRedirectingFactoryBody(target, typeArguments, function); |
| assert(function == _procedureInternal.function); |
| _procedureInternal.function.body!.parent = function; |
| _procedureInternal.function.redirectingFactoryTarget = |
| new RedirectingFactoryTarget(target, typeArguments); |
| } |
| |
| Set<Procedure> seenTargets = {}; |
| while (target is Procedure && target.isRedirectingFactory) { |
| if (!seenTargets.add(target)) { |
| // Cyclic dependency. |
| target = null; |
| break; |
| } |
| RedirectingFactoryTarget redirectingFactoryTarget = |
| target.function.redirectingFactoryTarget!; |
| if (typeArguments != null) { |
| Substitution substitution = Substitution.fromPairs( |
| target.function.typeParameters, typeArguments); |
| typeArguments = redirectingFactoryTarget.typeArguments |
| ?.map(substitution.substituteType) |
| .toList(); |
| } else { |
| typeArguments = redirectingFactoryTarget.typeArguments; |
| } |
| target = redirectingFactoryTarget.target; |
| } |
| |
| if (target is Constructor || |
| target is Procedure && |
| (target.isFactory || target.isExtensionTypeMember)) { |
| typeArguments ??= []; |
| if (_factoryTearOff != null) { |
| delayedDefaultValueCloners.add(buildRedirectingFactoryTearOffBody( |
| _factoryTearOff, |
| target!, |
| typeArguments, |
| _tearOffTypeParameters!, |
| libraryBuilder)); |
| } |
| delayedDefaultValueCloners.add(new DelayedDefaultValueCloner( |
| target!, _procedure, |
| libraryBuilder: libraryBuilder, identicalSignatures: false)); |
| } |
| if (isConst && isAugmenting) { |
| _finishAugmentation(); |
| } |
| _hasBuiltOutlines = true; |
| } |
| |
| @override |
| void _finishAugmentation() { |
| super._finishAugmentation(); |
| |
| SourceFactoryBuilder redirectingOrigin = origin; |
| if (redirectingOrigin is RedirectingFactoryBuilder) { |
| redirectingOrigin.typeArguments = typeArguments; |
| } |
| } |
| |
| List<DartType>? getTypeArguments() { |
| return _procedure.function.redirectingFactoryTarget!.typeArguments; |
| } |
| |
| @override |
| void checkVariance( |
| SourceClassBuilder sourceClassBuilder, TypeEnvironment typeEnvironment) {} |
| |
| @override |
| void checkTypes( |
| SourceLibraryBuilder library, TypeEnvironment typeEnvironment) { |
| library.checkTypesInRedirectingFactoryBuilder(this, typeEnvironment); |
| } |
| |
| // Computes the function type of a given redirection target. Returns [null] if |
| // the type of the target could not be computed. |
| FunctionType? _computeRedirecteeType( |
| RedirectingFactoryBuilder factory, TypeEnvironment typeEnvironment) { |
| ConstructorReferenceBuilder redirectionTarget = factory.redirectionTarget; |
| Builder? targetBuilder = redirectionTarget.target; |
| FunctionNode targetNode; |
| if (targetBuilder == null) return null; |
| if (targetBuilder is FunctionBuilder) { |
| targetNode = targetBuilder.function; |
| } else if (targetBuilder is DillExtensionTypeFactoryBuilder) { |
| targetNode = targetBuilder.member.function!; |
| } else if (targetBuilder is AmbiguousBuilder) { |
| // Multiple definitions with the same name: An error has already been |
| // issued. |
| // TODO(http://dartbug.com/35294): Unfortunate error; see also |
| // https://dart-review.googlesource.com/c/sdk/+/85390/. |
| return null; |
| } else { |
| unhandled("${targetBuilder.runtimeType}", "computeRedirecteeType", |
| charOffset, fileUri); |
| } |
| |
| List<DartType>? typeArguments = factory.getTypeArguments(); |
| FunctionType targetFunctionType = |
| targetNode.computeFunctionType(libraryBuilder.nonNullable); |
| if (typeArguments != null && |
| targetFunctionType.typeParameters.length != typeArguments.length) { |
| libraryBuilder.addProblemForRedirectingFactory( |
| factory, |
| templateTypeArgumentMismatch |
| .withArguments(targetFunctionType.typeParameters.length), |
| redirectionTarget.charOffset, |
| noLength, |
| redirectionTarget.fileUri); |
| return null; |
| } |
| |
| // Compute the substitution of the target class type parameters if |
| // [redirectionTarget] has any type arguments. |
| FunctionTypeInstantiator? instantiator; |
| bool hasProblem = false; |
| if (typeArguments != null && typeArguments.length > 0) { |
| instantiator = new FunctionTypeInstantiator.fromIterables( |
| targetFunctionType.typeParameters, typeArguments); |
| for (int i = 0; i < targetFunctionType.typeParameters.length; i++) { |
| StructuralParameter typeParameter = |
| targetFunctionType.typeParameters[i]; |
| DartType typeParameterBound = |
| instantiator.substitute(typeParameter.bound); |
| DartType typeArgument = typeArguments[i]; |
| // Check whether the [typeArgument] respects the bounds of |
| // [typeParameter]. |
| if (!typeEnvironment.isSubtypeOf(typeArgument, typeParameterBound, |
| SubtypeCheckMode.ignoringNullabilities)) { |
| libraryBuilder.addProblemForRedirectingFactory( |
| factory, |
| templateRedirectingFactoryIncompatibleTypeArgument.withArguments( |
| typeArgument, |
| typeParameterBound, |
| libraryBuilder.isNonNullableByDefault), |
| redirectionTarget.charOffset, |
| noLength, |
| redirectionTarget.fileUri); |
| hasProblem = true; |
| } else if (libraryBuilder.isNonNullableByDefault) { |
| if (!typeEnvironment.isSubtypeOf(typeArgument, typeParameterBound, |
| SubtypeCheckMode.withNullabilities)) { |
| libraryBuilder.addProblemForRedirectingFactory( |
| factory, |
| templateRedirectingFactoryIncompatibleTypeArgument |
| .withArguments(typeArgument, typeParameterBound, |
| libraryBuilder.isNonNullableByDefault), |
| redirectionTarget.charOffset, |
| noLength, |
| redirectionTarget.fileUri); |
| hasProblem = true; |
| } |
| } |
| } |
| } else if (typeArguments == null && |
| targetFunctionType.typeParameters.length > 0) { |
| // TODO(hillerstrom): In this case, we need to perform type inference on |
| // the redirectee to obtain actual type arguments which would allow the |
| // following program to type check: |
| // |
| // class A<T> { |
| // factory A() = B; |
| // } |
| // class B<T> implements A<T> { |
| // B(); |
| // } |
| // |
| return null; |
| } |
| |
| // Substitute if necessary. |
| targetFunctionType = instantiator == null |
| ? targetFunctionType |
| : (instantiator.substitute(targetFunctionType.withoutTypeParameters) |
| as FunctionType); |
| |
| return hasProblem ? null : targetFunctionType; |
| } |
| |
| bool _isCyclicRedirectingFactory(RedirectingFactoryBuilder factory) { |
| // We use the [tortoise and hare algorithm] |
| // (https://en.wikipedia.org/wiki/Cycle_detection#Tortoise_and_hare) to |
| // handle cycles. |
| Builder? tortoise = factory; |
| Builder? hare = factory.redirectionTarget.target; |
| if (hare == factory) { |
| return true; |
| } |
| while (tortoise != hare) { |
| // Hare moves 2 steps forward. |
| if (hare is! RedirectingFactoryBuilder) { |
| return false; |
| } |
| hare = hare.redirectionTarget.target; |
| if (hare == factory) { |
| return true; |
| } |
| if (hare is! RedirectingFactoryBuilder) { |
| return false; |
| } |
| hare = hare.redirectionTarget.target; |
| if (hare == factory) { |
| return true; |
| } |
| // Tortoise moves one step forward. No need to test type of tortoise |
| // as it follows hare which already checked types. |
| tortoise = |
| (tortoise as RedirectingFactoryBuilder).redirectionTarget.target; |
| } |
| // Cycle found, but original factory doesn't belong to a cycle. |
| return false; |
| } |
| |
| @override |
| void _checkRedirectingFactory(TypeEnvironment typeEnvironment) { |
| if (_hasBeenCheckedAsRedirectingFactory) return; |
| _hasBeenCheckedAsRedirectingFactory = true; |
| |
| // Check that factory declaration is not cyclic. |
| if (_isCyclicRedirectingFactory(this)) { |
| libraryBuilder.addProblemForRedirectingFactory( |
| this, |
| templateCyclicRedirectingFactoryConstructors |
| .withArguments("${declarationBuilder.name}" |
| "${name == '' ? '' : '.${name}'}"), |
| charOffset, |
| noLength, |
| fileUri); |
| return; |
| } |
| |
| // The factory type cannot contain any type parameters other than those of |
| // its enclosing class, because constructors cannot specify type parameters |
| // of their own. |
| FunctionType factoryType = |
| function.computeThisFunctionType(libraryBuilder.nonNullable); |
| if (isAugmenting) { |
| // The redirection target type uses the origin type parameters so we must |
| // substitute augmentation type parameters before checking subtyping. |
| if (function.typeParameters.isNotEmpty) { |
| Map<TypeParameter, DartType> substitution = <TypeParameter, DartType>{}; |
| for (int i = 0; i < function.typeParameters.length; i++) { |
| substitution[function.typeParameters[i]] = |
| new TypeParameterType.withDefaultNullabilityForLibrary( |
| actualOrigin!.function.typeParameters[i], |
| libraryBuilder.library); |
| } |
| factoryType = substitute(factoryType, substitution) as FunctionType; |
| } |
| } |
| FunctionType? redirecteeType = |
| _computeRedirecteeType(this, typeEnvironment); |
| Map<TypeParameter, DartType> substitutionMap = {}; |
| for (int i = 0; i < factoryType.typeParameters.length; i++) { |
| TypeParameter functionTypeParameter = origin.function.typeParameters[i]; |
| substitutionMap[functionTypeParameter] = |
| new StructuralParameterType.forAlphaRenamingFromTypeParameters( |
| functionTypeParameter, factoryType.typeParameters[i]); |
| } |
| redirecteeType = redirecteeType != null |
| ? substitute(redirecteeType, substitutionMap) as FunctionType |
| : null; |
| |
| // TODO(hillerstrom): It would be preferable to know whether a failure |
| // happened during [_computeRedirecteeType]. |
| if (redirecteeType == null) { |
| return; |
| } |
| |
| Builder? redirectionTargetBuilder = redirectionTarget.target; |
| if (redirectionTargetBuilder is RedirectingFactoryBuilder) { |
| redirectionTargetBuilder._checkRedirectingFactory(typeEnvironment); |
| String? errorMessage = redirectionTargetBuilder |
| .function.redirectingFactoryTarget?.errorMessage; |
| if (errorMessage != null) { |
| setRedirectingFactoryError(errorMessage); |
| } |
| } |
| |
| // Redirection to generative enum constructors is forbidden and is reported |
| // as an error elsewhere. |
| Builder? redirectionTargetParent = redirectionTarget.target?.parent; |
| bool redirectingTargetParentIsEnum = redirectionTargetParent is ClassBuilder |
| ? redirectionTargetParent.isEnum |
| : false; |
| if (!((classBuilder?.cls.isEnum ?? false) && |
| (redirectionTarget.target?.isConstructor ?? false) && |
| redirectingTargetParentIsEnum)) { |
| // Check whether [redirecteeType] <: [factoryType]. |
| if (!typeEnvironment.isSubtypeOf( |
| redirecteeType, |
| factoryType.withoutTypeParameters, |
| SubtypeCheckMode.ignoringNullabilities)) { |
| libraryBuilder.addProblemForRedirectingFactory( |
| this, |
| templateIncompatibleRedirecteeFunctionType.withArguments( |
| redirecteeType, |
| factoryType.withoutTypeParameters, |
| libraryBuilder.isNonNullableByDefault), |
| redirectionTarget.charOffset, |
| noLength, |
| redirectionTarget.fileUri); |
| } else if (libraryBuilder.isNonNullableByDefault) { |
| if (!typeEnvironment.isSubtypeOf( |
| redirecteeType, |
| factoryType.withoutTypeParameters, |
| SubtypeCheckMode.withNullabilities)) { |
| libraryBuilder.addProblemForRedirectingFactory( |
| this, |
| templateIncompatibleRedirecteeFunctionType.withArguments( |
| redirecteeType, |
| factoryType.withoutTypeParameters, |
| libraryBuilder.isNonNullableByDefault), |
| redirectionTarget.charOffset, |
| noLength, |
| redirectionTarget.fileUri); |
| } |
| } |
| } |
| } |
| |
| @override |
| BodyBuilderContext get bodyBuilderContext => |
| new RedirectingFactoryBodyBuilderContext(this); |
| } |
