| // Copyright (c) 2025, 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 '../../base/identifiers.dart'; |
| import '../../base/problems.dart' show unexpected, unhandled; |
| import '../../base/scope.dart'; |
| import '../../builder/builder.dart'; |
| import '../../builder/constructor_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/member_builder.dart'; |
| import '../../builder/omitted_type_builder.dart'; |
| import '../../builder/type_builder.dart'; |
| import '../../codes/cfe_codes.dart'; |
| import '../../dill/dill_extension_type_member_builder.dart'; |
| import '../../dill/dill_member_builder.dart'; |
| import '../../fragment/fragment.dart'; |
| import '../../kernel/body_builder_context.dart'; |
| import '../../kernel/constructor_tearoff_lowering.dart'; |
| import '../../kernel/kernel_helper.dart'; |
| import '../../source/name_scheme.dart'; |
| import '../../source/redirecting_factory_body.dart'; |
| import '../../source/source_factory_builder.dart'; |
| import '../../source/source_function_builder.dart'; |
| import '../../source/source_library_builder.dart' show SourceLibraryBuilder; |
| import '../../source/source_loader.dart' |
| show CompilationPhaseForProblemReporting, SourceLoader; |
| import '../../source/source_member_builder.dart'; |
| import '../../source/source_type_parameter_builder.dart'; |
| import '../../type_inference/inference_helper.dart'; |
| import '../../type_inference/type_inferrer.dart'; |
| import '../../type_inference/type_schema.dart'; |
| |
| class FactoryEncoding implements InferredTypeListener { |
| late final Procedure _procedure; |
| late final Procedure? _tearOff; |
| |
| final FactoryFragment _fragment; |
| |
| AsyncMarker _asyncModifier; |
| |
| final List<SourceNominalParameterBuilder>? typeParameters; |
| |
| final TypeBuilder returnType; |
| |
| DelayedDefaultValueCloner? _delayedDefaultValueCloner; |
| |
| List<DartType>? _redirectionTypeArguments; |
| |
| FreshTypeParameters? _tearOffTypeParameters; |
| |
| final ConstructorReferenceBuilder? _redirectionTarget; |
| |
| FactoryEncoding( |
| this._fragment, { |
| required this.typeParameters, |
| required this.returnType, |
| required ConstructorReferenceBuilder? redirectionTarget, |
| }) : _redirectionTarget = redirectionTarget, |
| _asyncModifier = redirectionTarget != null |
| ? AsyncMarker.Sync |
| : _fragment.asyncModifier; |
| |
| void createNode({ |
| required String name, |
| required SourceLibraryBuilder libraryBuilder, |
| required NameScheme nameScheme, |
| required Reference? procedureReference, |
| required Reference? tearOffReference, |
| }) { |
| _procedure = new Procedure( |
| dummyName, |
| nameScheme.isExtensionTypeMember |
| ? ProcedureKind.Method |
| : ProcedureKind.Factory, |
| new FunctionNode(null) |
| ..asyncMarker = _asyncModifier |
| ..dartAsyncMarker = _asyncModifier, |
| fileUri: _fragment.fileUri, |
| reference: procedureReference) |
| ..fileStartOffset = _fragment.startOffset |
| ..fileOffset = _fragment.fullNameOffset |
| ..fileEndOffset = _fragment.endOffset |
| ..isExtensionTypeMember = nameScheme.isExtensionTypeMember; |
| nameScheme |
| .getConstructorMemberName(name, isTearOff: false) |
| .attachMember(_procedure); |
| _tearOff = createFactoryTearOffProcedure( |
| nameScheme.getConstructorMemberName(name, isTearOff: true), |
| libraryBuilder, |
| _fragment.fileUri, |
| _fragment.fullNameOffset, |
| tearOffReference, |
| forceCreateLowering: nameScheme.isExtensionTypeMember) |
| ?..isExtensionTypeMember = nameScheme.isExtensionTypeMember; |
| returnType.registerInferredTypeListener(this); |
| } |
| |
| Procedure get procedure => _procedure; |
| |
| Procedure? get tearOff => _tearOff; |
| |
| @override |
| // Coverage-ignore(suite): Not run. |
| void onInferredType(DartType type) { |
| _procedure.function.returnType = type; |
| } |
| |
| void set asyncModifier(AsyncMarker newModifier) { |
| _asyncModifier = newModifier; |
| _procedure.function.asyncMarker = _asyncModifier; |
| _procedure.function.dartAsyncMarker = _asyncModifier; |
| } |
| |
| List<DartType>? get redirectionTypeArguments { |
| assert(_redirectionTarget != null); |
| return _redirectionTypeArguments; |
| } |
| |
| void set redirectionTypeArguments(List<DartType>? value) { |
| assert(_redirectionTarget != null); |
| _redirectionTypeArguments = value; |
| } |
| |
| void buildOutlineNodes( |
| {required SourceLibraryBuilder libraryBuilder, |
| required SourceFactoryBuilder factoryBuilder, |
| required BuildNodesCallback f, |
| required bool isConst}) { |
| _procedure.function.asyncMarker = _asyncModifier; |
| if (_redirectionTarget == null && |
| !_fragment.modifiers.isAbstract && |
| !_fragment.modifiers.isExternal) { |
| _procedure.function.body = new EmptyStatement() |
| ..parent = _procedure.function; |
| } |
| buildTypeParametersAndFormals( |
| libraryBuilder, _procedure.function, typeParameters, _fragment.formals, |
| classTypeParameters: null, supportsTypeParameters: true); |
| if (returnType is! InferableTypeBuilder) { |
| _procedure.function.returnType = |
| returnType.build(libraryBuilder, TypeUse.returnType); |
| } |
| _procedure.function.fileOffset = _fragment.formalsOffset; |
| _procedure.function.fileEndOffset = _procedure.fileEndOffset; |
| _procedure.isAbstract = _fragment.modifiers.isAbstract; |
| _procedure.isExternal = _fragment.modifiers.isExternal; |
| // TODO(johnniwinther): DDC platform currently relies on the ability to |
| // patch a const constructor with a non-const patch. Remove this and enforce |
| // equal constness on origin and patch. |
| _procedure.isConst = isConst; |
| _procedure.isStatic = _fragment.modifiers.isStatic; |
| |
| if (_redirectionTarget != null) { |
| if (_redirectionTarget.typeArguments != null) { |
| redirectionTypeArguments = new List<DartType>.generate( |
| _redirectionTarget.typeArguments!.length, |
| (int i) => _redirectionTarget.typeArguments![i] |
| .build(libraryBuilder, TypeUse.redirectionTypeArgument), |
| growable: false); |
| } |
| if (_tearOff != null) { |
| _tearOffTypeParameters = |
| buildRedirectingFactoryTearOffProcedureParameters( |
| tearOff: _tearOff, |
| implementationConstructor: _procedure, |
| libraryBuilder: libraryBuilder); |
| } |
| } else { |
| if (_tearOff != null) { |
| _delayedDefaultValueCloner = buildConstructorTearOffProcedure( |
| tearOff: _tearOff, |
| declarationConstructor: _procedure, |
| implementationConstructor: _procedure, |
| libraryBuilder: libraryBuilder); |
| } |
| } |
| f( |
| member: _procedure, |
| tearOff: _tearOff, |
| kind: factoryBuilder.isExtensionTypeMember |
| ? (_redirectionTarget != null |
| ? BuiltMemberKind.ExtensionTypeRedirectingFactory |
| : BuiltMemberKind.ExtensionTypeFactory) |
| : (_redirectionTarget != null |
| ? BuiltMemberKind.RedirectingFactory |
| : BuiltMemberKind.Factory)); |
| } |
| |
| void buildOutlineExpressions( |
| {required List<DelayedDefaultValueCloner> delayedDefaultValueCloners}) { |
| if (_delayedDefaultValueCloner != null) { |
| delayedDefaultValueCloners.add(_delayedDefaultValueCloner!); |
| } |
| } |
| |
| void inferRedirectionTarget( |
| {required SourceLibraryBuilder libraryBuilder, |
| required DeclarationBuilder declarationBuilder, |
| required BodyBuilderContext bodyBuilderContext, |
| required ClassHierarchy classHierarchy, |
| required List<DelayedDefaultValueCloner> delayedDefaultValueCloners}) { |
| if (_redirectionTarget == null) { |
| return; |
| } |
| |
| RedirectingFactoryTarget? redirectingFactoryTarget = |
| _procedure.function.redirectingFactoryTarget; |
| if (redirectingFactoryTarget == null) { |
| // The error is reported elsewhere. |
| return; |
| } |
| List<DartType>? typeArguments = redirectingFactoryTarget.typeArguments; |
| Member? target = redirectingFactoryTarget.target; |
| if (typeArguments != null && typeArguments.any((t) => t is UnknownType)) { |
| TypeInferrer inferrer = libraryBuilder.loader.typeInferenceEngine |
| .createLocalTypeInferrer( |
| _fragment.fileUri, |
| declarationBuilder.thisType, |
| libraryBuilder, |
| _fragment.typeParameterScope, |
| null); |
| InferenceHelper helper = libraryBuilder.loader |
| .createBodyBuilderForOutlineExpression(libraryBuilder, |
| bodyBuilderContext, _fragment.enclosingScope, _fragment.fileUri); |
| Builder? targetBuilder = _redirectionTarget.target; |
| |
| if (targetBuilder is SourceMemberBuilder) { |
| // Ensure that target has been built. |
| targetBuilder.buildOutlineExpressions( |
| classHierarchy, delayedDefaultValueCloners); |
| } |
| if (targetBuilder is FunctionBuilder) { |
| target = targetBuilder.invokeTarget!; |
| } |
| // Coverage-ignore(suite): Not run. |
| else if (targetBuilder is DillMemberBuilder) { |
| target = targetBuilder.invokeTarget!; |
| } else { |
| unhandled("${targetBuilder.runtimeType}", "buildOutlineExpressions", |
| _fragment.fullNameOffset, _fragment.fileUri); |
| } |
| |
| typeArguments = inferrer.inferRedirectingFactoryTypeArguments( |
| helper, |
| _procedure.function.returnType, |
| _procedure.function, |
| _fragment.fullNameOffset, |
| target, |
| target.function!.computeFunctionType(Nullability.nonNullable)); |
| if (typeArguments == null) { |
| assert(libraryBuilder.loader.assertProblemReportedElsewhere( |
| "RedirectingFactoryTarget.buildOutlineExpressions", |
| expectedPhase: CompilationPhaseForProblemReporting.outline)); |
| // Use 'dynamic' for recovery. |
| typeArguments = new List<DartType>.filled( |
| declarationBuilder.typeParametersCount, const DynamicType(), |
| growable: true); |
| } |
| |
| _procedure.function.body = createRedirectingFactoryBody( |
| target, typeArguments, _procedure.function); |
| _procedure.function.body!.parent = _procedure.function; |
| _procedure.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 { |
| // Coverage-ignore-block(suite): Not run. |
| typeArguments = redirectingFactoryTarget.typeArguments; |
| } |
| target = redirectingFactoryTarget.target; |
| } |
| |
| if (target is Constructor || |
| target is Procedure && |
| (target.isFactory || target.isExtensionTypeMember)) { |
| // Coverage-ignore(suite): Not run. |
| typeArguments ??= []; |
| if (_tearOff != null) { |
| delayedDefaultValueCloners.add(buildRedirectingFactoryTearOffBody( |
| _tearOff, |
| target!, |
| typeArguments, |
| _tearOffTypeParameters!, |
| libraryBuilder)); |
| } |
| delayedDefaultValueCloners.add(new DelayedDefaultValueCloner( |
| target!, _procedure, |
| libraryBuilder: libraryBuilder, identicalSignatures: false)); |
| } |
| } |
| |
| void resolveRedirectingFactory( |
| {required SourceLibraryBuilder libraryBuilder}) { |
| ConstructorReferenceBuilder? redirectionTarget = _redirectionTarget; |
| if (redirectionTarget != null) { |
| // Compute the immediate redirection target, not the effective. |
| List<TypeBuilder>? typeArguments = redirectionTarget.typeArguments; |
| Builder? target = redirectionTarget.target; |
| if (typeArguments != null && target is MemberBuilder) { |
| TypeName redirectionTargetName = redirectionTarget.typeName; |
| if (redirectionTargetName.qualifier == null) { |
| // Do nothing. This is the case of an identifier followed by |
| // type arguments, such as the following: |
| // B<T> |
| // B<T>.named |
| } else { |
| if (target.name.isEmpty) { |
| // Do nothing. This is the case of a qualified |
| // non-constructor prefix (for example, with a library |
| // qualifier) followed by type arguments, such as the |
| // following: |
| // lib.B<T> |
| } else if (target.name != redirectionTargetName.name) { |
| // Do nothing. This is the case of a qualified |
| // non-constructor prefix followed by type arguments followed |
| // by a constructor name, such as the following: |
| // lib.B<T>.named |
| } else { |
| // TODO(cstefantsova,johnniwinther): Handle this in case in |
| // ConstructorReferenceBuilder.resolveIn and unify with other |
| // cases of handling of type arguments after constructor |
| // names. |
| libraryBuilder.addProblem( |
| messageConstructorWithTypeArguments, |
| redirectionTargetName.nameOffset, |
| redirectionTargetName.nameLength, |
| _fragment.fileUri); |
| } |
| } |
| } |
| |
| Builder? targetBuilder = redirectionTarget.target; |
| Member? targetNode; |
| if (targetBuilder is FunctionBuilder) { |
| targetNode = targetBuilder.invokeTarget!; |
| } else if (targetBuilder is DillMemberBuilder) { |
| // Coverage-ignore-block(suite): Not run. |
| targetNode = targetBuilder.invokeTarget!; |
| } else if (targetBuilder is AmbiguousBuilder) { |
| _addProblemForRedirectingFactory( |
| libraryBuilder: libraryBuilder, |
| message: templateDuplicatedDeclarationUse |
| .withArguments(redirectionTarget.fullNameForErrors), |
| fileOffset: redirectionTarget.charOffset, |
| length: noLength, |
| fileUri: redirectionTarget.fileUri); |
| } else { |
| _addProblemForRedirectingFactory( |
| libraryBuilder: libraryBuilder, |
| message: templateRedirectionTargetNotFound |
| .withArguments(redirectionTarget.fullNameForErrors), |
| fileOffset: redirectionTarget.charOffset, |
| length: noLength, |
| fileUri: redirectionTarget.fileUri); |
| } |
| if (targetNode != null && |
| targetNode is Constructor && |
| targetNode.enclosingClass.isAbstract) { |
| _addProblemForRedirectingFactory( |
| libraryBuilder: libraryBuilder, |
| message: templateAbstractRedirectedClassInstantiation |
| .withArguments(redirectionTarget.fullNameForErrors), |
| fileOffset: redirectionTarget.charOffset, |
| length: noLength, |
| fileUri: redirectionTarget.fileUri); |
| targetNode = null; |
| } |
| if (targetNode != null && |
| targetNode is Constructor && |
| targetNode.enclosingClass.isEnum) { |
| _addProblemForRedirectingFactory( |
| libraryBuilder: libraryBuilder, |
| message: messageEnumFactoryRedirectsToConstructor, |
| fileOffset: redirectionTarget.charOffset, |
| length: noLength, |
| fileUri: redirectionTarget.fileUri); |
| targetNode = null; |
| } |
| if (targetNode != null) { |
| List<DartType>? typeArguments = redirectionTypeArguments; |
| if (typeArguments == null) { |
| int typeArgumentCount; |
| if (targetBuilder!.isExtensionTypeMember) { |
| ExtensionTypeDeclarationBuilder extensionTypeDeclarationBuilder = |
| targetBuilder.parent as ExtensionTypeDeclarationBuilder; |
| typeArgumentCount = |
| extensionTypeDeclarationBuilder.typeParametersCount; |
| } else { |
| typeArgumentCount = |
| targetNode.enclosingClass!.typeParameters.length; |
| } |
| typeArguments = |
| new List<DartType>.filled(typeArgumentCount, const UnknownType()); |
| } |
| _setRedirectingFactoryBody( |
| libraryBuilder: libraryBuilder, |
| target: targetNode, |
| typeArguments: typeArguments); |
| } |
| } |
| } |
| |
| void _setRedirectingFactoryBody( |
| {required SourceLibraryBuilder libraryBuilder, |
| required Member target, |
| required List<DartType> typeArguments}) { |
| if (_procedure.function.body != null) { |
| unexpected("null", "${_procedure.function.body.runtimeType}", |
| _fragment.fullNameOffset, _fragment.fileUri); |
| } |
| |
| // Ensure that constant factories only have constant targets/bodies. |
| if (_fragment.modifiers.isConst && !target.isConst) { |
| // Coverage-ignore-block(suite): Not run. |
| libraryBuilder.addProblem(messageConstFactoryRedirectionToNonConst, |
| _fragment.fullNameOffset, noLength, _fragment.fileUri); |
| } |
| |
| _procedure.function.body = |
| createRedirectingFactoryBody(target, typeArguments, _procedure.function) |
| ..parent = _procedure.function; |
| _procedure.function.redirectingFactoryTarget = |
| new RedirectingFactoryTarget(target, typeArguments); |
| } |
| |
| void _addProblemForRedirectingFactory( |
| {required SourceLibraryBuilder libraryBuilder, |
| required Message message, |
| required int fileOffset, |
| required int length, |
| required Uri fileUri}) { |
| libraryBuilder.addProblem(message, fileOffset, length, fileUri); |
| String text = libraryBuilder.loader.target.context |
| .format( |
| message.withLocation(fileUri, fileOffset, length), Severity.error) |
| .plain; |
| _setRedirectingFactoryError(message: text); |
| } |
| |
| void _setRedirectingFactoryError({required String message}) { |
| assert(_redirectionTarget != null); |
| |
| setBody(createRedirectingFactoryErrorBody(message)); |
| _procedure.function.redirectingFactoryTarget = |
| new RedirectingFactoryTarget.error(message); |
| if (_tearOff != null) { |
| _tearOff.function.body = createRedirectingFactoryErrorBody(message) |
| ..parent = _tearOff.function; |
| } |
| } |
| |
| /// Checks this factory builder if it is for a redirecting factory. |
| void checkRedirectingFactory( |
| {required SourceLibraryBuilder libraryBuilder, |
| required SourceFactoryBuilder factoryBuilder, |
| required TypeEnvironment typeEnvironment}) { |
| assert(_redirectionTarget != null); |
| |
| // Check that factory declaration is not cyclic. |
| if (_isCyclicRedirectingFactory(factoryBuilder)) { |
| _addProblemForRedirectingFactory( |
| libraryBuilder: libraryBuilder, |
| message: templateCyclicRedirectingFactoryConstructors |
| .withArguments("${factoryBuilder.declarationBuilder.name}" |
| "${_fragment.name == '' ? '' : '.${_fragment.name}'}"), |
| fileOffset: _fragment.fullNameOffset, |
| length: noLength, |
| fileUri: _fragment.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 = |
| _procedure.function.computeThisFunctionType(Nullability.nonNullable); |
| FunctionType? redirecteeType = _computeRedirecteeType( |
| libraryBuilder: libraryBuilder, typeEnvironment: typeEnvironment); |
| Map<TypeParameter, DartType> substitutionMap = {}; |
| for (int i = 0; i < factoryType.typeParameters.length; i++) { |
| TypeParameter functionTypeParameter = |
| _procedure.function.typeParameters[i]; |
| substitutionMap[functionTypeParameter] = |
| new StructuralParameterType.withDefaultNullability( |
| 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 SourceFactoryBuilder && |
| redirectionTargetBuilder.redirectionTarget != null) { |
| redirectionTargetBuilder.checkRedirectingFactories(typeEnvironment); |
| String? errorMessage = redirectionTargetBuilder |
| .function.redirectingFactoryTarget?.errorMessage; |
| if (errorMessage != null) { |
| _setRedirectingFactoryError(message: errorMessage); |
| } |
| } |
| |
| Builder? redirectionTargetParent = _redirectionTarget.target?.parent; |
| bool redirectingTargetParentIsEnum = redirectionTargetParent is ClassBuilder |
| ? redirectionTargetParent.isEnum |
| : false; |
| if (!((factoryBuilder.classBuilder?.cls.isEnum ?? false) && |
| (_redirectionTarget.target is ConstructorBuilder) && |
| redirectingTargetParentIsEnum)) { |
| // Check whether [redirecteeType] <: [factoryType]. |
| FunctionType factoryTypeWithoutTypeParameters = |
| factoryType.withoutTypeParameters; |
| if (!typeEnvironment.isSubtypeOf( |
| redirecteeType, |
| factoryTypeWithoutTypeParameters, |
| SubtypeCheckMode.withNullabilities)) { |
| _addProblemForRedirectingFactory( |
| libraryBuilder: libraryBuilder, |
| message: templateIncompatibleRedirecteeFunctionType.withArguments( |
| redirecteeType, factoryTypeWithoutTypeParameters), |
| fileOffset: _redirectionTarget.charOffset, |
| length: noLength, |
| fileUri: _redirectionTarget.fileUri); |
| } |
| } else { |
| // Redirection to generative enum constructors is forbidden. |
| assert(libraryBuilder.loader.assertProblemReportedElsewhere( |
| "RedirectingFactoryBuilder._checkRedirectingFactory: " |
| "Redirection to generative enum constructor.", |
| expectedPhase: CompilationPhaseForProblemReporting.bodyBuilding)); |
| } |
| } |
| |
| // Computes the function type of a given redirection target. Returns [null] if |
| // the type of the target could not be computed. |
| FunctionType? _computeRedirecteeType( |
| {required SourceLibraryBuilder libraryBuilder, |
| required TypeEnvironment typeEnvironment}) { |
| assert(_redirectionTarget != null); |
| ConstructorReferenceBuilder redirectionTarget = _redirectionTarget!; |
| Builder? targetBuilder = redirectionTarget.target; |
| FunctionNode targetNode; |
| if (targetBuilder == null) return null; |
| if (targetBuilder is FunctionBuilder) { |
| targetNode = targetBuilder.function; |
| } else if (targetBuilder is DillExtensionTypeFactoryBuilder) { |
| // Coverage-ignore-block(suite): Not run. |
| 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", |
| _fragment.fullNameOffset, _fragment.fileUri); |
| } |
| |
| List<DartType>? typeArguments = |
| _procedure.function.redirectingFactoryTarget!.typeArguments; |
| FunctionType targetFunctionType = |
| targetNode.computeFunctionType(Nullability.nonNullable); |
| if (typeArguments != null && |
| targetFunctionType.typeParameters.length != typeArguments.length) { |
| _addProblemForRedirectingFactory( |
| libraryBuilder: libraryBuilder, |
| message: templateTypeArgumentMismatch |
| .withArguments(targetFunctionType.typeParameters.length), |
| fileOffset: redirectionTarget.charOffset, |
| length: noLength, |
| fileUri: 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)) { |
| // Coverage-ignore-block(suite): Not run. |
| _addProblemForRedirectingFactory( |
| libraryBuilder: libraryBuilder, |
| message: templateRedirectingFactoryIncompatibleTypeArgument |
| .withArguments(typeArgument, typeParameterBound), |
| fileOffset: redirectionTarget.charOffset, |
| length: noLength, |
| fileUri: redirectionTarget.fileUri); |
| hasProblem = true; |
| } else { |
| if (!typeEnvironment.isSubtypeOf(typeArgument, typeParameterBound, |
| SubtypeCheckMode.withNullabilities)) { |
| _addProblemForRedirectingFactory( |
| libraryBuilder: libraryBuilder, |
| message: templateRedirectingFactoryIncompatibleTypeArgument |
| .withArguments(typeArgument, typeParameterBound), |
| fileOffset: redirectionTarget.charOffset, |
| length: noLength, |
| fileUri: 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; |
| } |
| |
| static bool _isCyclicRedirectingFactory(SourceFactoryBuilder factory) { |
| assert(factory.redirectionTarget != null); |
| // 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! SourceFactoryBuilder || hare.redirectionTarget == null) { |
| return false; |
| } |
| hare = hare.redirectionTarget!.target; |
| if (hare == factory) { |
| return true; |
| } |
| if (hare is! SourceFactoryBuilder || hare.redirectionTarget == null) { |
| 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 SourceFactoryBuilder).redirectionTarget!.target; |
| } |
| // Cycle found, but original factory doesn't belong to a cycle. |
| return false; |
| } |
| |
| void setBody(Statement value) { |
| _procedure.function.body = value..parent = _procedure.function; |
| } |
| |
| void becomeNative(SourceLoader loader) { |
| _procedure.isExternal = true; |
| } |
| |
| // Coverage-ignore(suite): Not run. |
| bool get isNative => _fragment.nativeMethodName != null; |
| |
| FunctionNode get function => _procedure.function; |
| |
| FormalParameterBuilder? getFormal(Identifier identifier) { |
| if (_fragment.formals != null) { |
| for (FormalParameterBuilder formal in _fragment.formals!) { |
| if (formal.isWildcard && |
| identifier.name == '_' && |
| formal.fileOffset == identifier.nameOffset) { |
| return formal; |
| } |
| if (formal.name == identifier.name && |
| formal.fileOffset == identifier.nameOffset) { |
| return formal; |
| } |
| } |
| // Coverage-ignore(suite): Not run. |
| // If we have any formals we should find the one we're looking for. |
| assert(false, "$identifier not found in ${_fragment.formals}"); |
| } |
| return null; |
| } |
| |
| VariableDeclaration? getTearOffParameter(int index) { |
| if (_tearOff != null) { |
| if (index < _tearOff.function.positionalParameters.length) { |
| return _tearOff.function.positionalParameters[index]; |
| } else { |
| index -= _tearOff.function.positionalParameters.length; |
| if (index < _tearOff.function.namedParameters.length) { |
| return _tearOff.function.namedParameters[index]; |
| } |
| } |
| } |
| return null; |
| } |
| } |
