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source_class_builder.dart
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source_class_builder.dart
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// Copyright (c) 2016, 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.
// @dart = 2.9
library fasta.source_class_builder;
import 'package:front_end/src/fasta/kernel/combined_member_signature.dart';
import 'package:kernel/ast.dart';
import 'package:kernel/class_hierarchy.dart' show ClassHierarchy;
import 'package:kernel/reference_from_index.dart' show IndexedClass;
import 'package:kernel/src/bounds_checks.dart';
import 'package:kernel/src/legacy_erasure.dart';
import 'package:kernel/src/types.dart' show Types;
import 'package:kernel/type_algebra.dart' show Substitution;
import 'package:kernel/type_environment.dart';
import '../builder/builder.dart';
import '../builder/class_builder.dart';
import '../builder/constructor_builder.dart';
import '../builder/constructor_reference_builder.dart';
import '../builder/field_builder.dart';
import '../builder/function_builder.dart';
import '../builder/invalid_type_declaration_builder.dart';
import '../builder/library_builder.dart';
import '../builder/member_builder.dart';
import '../builder/metadata_builder.dart';
import '../builder/named_type_builder.dart';
import '../builder/nullability_builder.dart';
import '../builder/procedure_builder.dart';
import '../builder/type_alias_builder.dart';
import '../builder/type_builder.dart';
import '../builder/type_declaration_builder.dart';
import '../builder/type_variable_builder.dart';
import '../dill/dill_member_builder.dart';
import '../fasta_codes.dart';
import '../kernel/kernel_builder.dart' show compareProcedures;
import '../kernel/kernel_target.dart' show KernelTarget;
import '../kernel/redirecting_factory_body.dart' show RedirectingFactoryBody;
import '../kernel/redirecting_factory_body.dart' show redirectingName;
import '../kernel/type_algorithms.dart'
show Variance, computeTypeVariableBuilderVariance;
import '../names.dart' show equalsName, noSuchMethodName;
import '../problems.dart' show unexpected, unhandled, unimplemented;
import '../scope.dart';
import '../type_inference/type_schema.dart';
import 'source_library_builder.dart' show SourceLibraryBuilder;
Class initializeClass(
Class cls,
List<TypeVariableBuilder> typeVariables,
String name,
SourceLibraryBuilder parent,
int startCharOffset,
int charOffset,
int charEndOffset,
Class referencesFrom) {
cls ??= new Class(
name: name,
typeParameters:
TypeVariableBuilder.typeParametersFromBuilders(typeVariables),
reference: referencesFrom?.reference);
cls.fileUri ??= parent.fileUri;
if (cls.startFileOffset == TreeNode.noOffset) {
cls.startFileOffset = startCharOffset;
}
if (cls.fileOffset == TreeNode.noOffset) {
cls.fileOffset = charOffset;
}
if (cls.fileEndOffset == TreeNode.noOffset) {
cls.fileEndOffset = charEndOffset;
}
return cls;
}
class SourceClassBuilder extends ClassBuilderImpl
implements Comparable<SourceClassBuilder> {
@override
final Class actualCls;
final List<ConstructorReferenceBuilder> constructorReferences;
TypeBuilder mixedInTypeBuilder;
bool isMixinDeclaration;
final Class referencesFrom;
final IndexedClass referencesFromIndexed;
SourceClassBuilder(
List<MetadataBuilder> metadata,
int modifiers,
String name,
List<TypeVariableBuilder> typeVariables,
TypeBuilder supertype,
List<TypeBuilder> interfaces,
List<TypeBuilder> onTypes,
Scope scope,
ConstructorScope constructors,
LibraryBuilder parent,
this.constructorReferences,
int startCharOffset,
int nameOffset,
int charEndOffset,
Class referencesFrom,
IndexedClass referencesFromIndexed, {
Class cls,
this.mixedInTypeBuilder,
this.isMixinDeclaration = false,
}) : actualCls = initializeClass(cls, typeVariables, name, parent,
startCharOffset, nameOffset, charEndOffset, referencesFrom),
referencesFrom = referencesFrom,
referencesFromIndexed = referencesFromIndexed,
super(metadata, modifiers, name, typeVariables, supertype, interfaces,
onTypes, scope, constructors, parent, nameOffset) {
actualCls.hasConstConstructor = declaresConstConstructor;
}
@override
Class get cls => origin.actualCls;
@override
SourceLibraryBuilder get library => super.library;
Class build(SourceLibraryBuilder library, LibraryBuilder coreLibrary) {
SourceLibraryBuilder.checkMemberConflicts(library, scope,
// These checks are performed as part of the class hierarchy
// computation.
checkForInstanceVsStaticConflict: false,
checkForMethodVsSetterConflict: false);
void buildBuilders(String name, Builder declaration) {
do {
if (declaration.parent != this) {
if (fileUri != declaration.parent.fileUri) {
unexpected("$fileUri", "${declaration.parent.fileUri}", charOffset,
fileUri);
} else {
unexpected(fullNameForErrors, declaration.parent?.fullNameForErrors,
charOffset, fileUri);
}
} else if (declaration is MemberBuilderImpl) {
MemberBuilderImpl memberBuilder = declaration;
memberBuilder.buildMembers(library,
(Member member, BuiltMemberKind memberKind) {
member.parent = cls;
if (!memberBuilder.isPatch &&
!memberBuilder.isDuplicate &&
!memberBuilder.isConflictingSetter) {
if (member is Procedure) {
cls.addProcedure(member);
} else if (member is Field) {
cls.addField(member);
} else if (member is Constructor) {
cls.addConstructor(member);
} else if (member is RedirectingFactoryConstructor) {
cls.addRedirectingFactoryConstructor(member);
} else {
unhandled("${member.runtimeType}", "getMember",
member.fileOffset, member.fileUri);
}
}
});
} else {
unhandled("${declaration.runtimeType}", "buildBuilders",
declaration.charOffset, declaration.fileUri);
}
declaration = declaration.next;
} while (declaration != null);
}
scope.forEach(buildBuilders);
constructors.forEach(buildBuilders);
supertypeBuilder = checkSupertype(supertypeBuilder);
Supertype supertype =
supertypeBuilder?.buildSupertype(library, charOffset, fileUri);
if (supertype != null) {
Class superclass = supertype.classNode;
if (superclass.name == 'Function' &&
superclass.enclosingLibrary == coreLibrary.library) {
library.addProblem(
messageExtendFunction, charOffset, noLength, fileUri);
supertype = null;
supertypeBuilder = null;
}
}
if (!isMixinDeclaration &&
actualCls.supertype != null &&
actualCls.superclass.isMixinDeclaration) {
// Declared mixins have interfaces that can be implemented, but they
// cannot be extended. However, a mixin declaration with a single
// superclass constraint is encoded with the constraint as the supertype,
// and that is allowed to be a mixin's interface.
library.addProblem(
templateSupertypeIsIllegal.withArguments(actualCls.superclass.name),
charOffset,
noLength,
fileUri);
supertype = null;
}
if (supertype == null && supertypeBuilder is! NamedTypeBuilder) {
supertypeBuilder = null;
}
actualCls.supertype = supertype;
mixedInTypeBuilder = checkSupertype(mixedInTypeBuilder);
Supertype mixedInType =
mixedInTypeBuilder?.buildMixedInType(library, charOffset, fileUri);
if (mixedInType != null) {
Class superclass = mixedInType.classNode;
if (superclass.name == 'Function' &&
superclass.enclosingLibrary == coreLibrary.library) {
library.addProblem(messageMixinFunction, charOffset, noLength, fileUri);
mixedInType = null;
mixedInTypeBuilder = null;
actualCls.isAnonymousMixin = false;
isMixinDeclaration = false;
}
}
if (mixedInType == null && mixedInTypeBuilder is! NamedTypeBuilder) {
mixedInTypeBuilder = null;
}
actualCls.isMixinDeclaration = isMixinDeclaration;
actualCls.mixedInType = mixedInType;
// TODO(ahe): If `cls.supertype` is null, and this isn't Object, report a
// compile-time error.
cls.isAbstract = isAbstract;
if (interfaceBuilders != null) {
for (int i = 0; i < interfaceBuilders.length; ++i) {
interfaceBuilders[i] = checkSupertype(interfaceBuilders[i]);
Supertype supertype =
interfaceBuilders[i].buildSupertype(library, charOffset, fileUri);
if (supertype != null) {
Class superclass = supertype.classNode;
if (superclass.name == 'Function' &&
superclass.enclosingLibrary == coreLibrary.library) {
library.addProblem(
messageImplementFunction, charOffset, noLength, fileUri);
continue;
}
// TODO(ahe): Report an error if supertype is null.
actualCls.implementedTypes.add(supertype);
}
}
}
constructors.forEach((String name, Builder constructor) {
Builder member = scopeBuilder[name];
if (member == null) return;
if (!member.isStatic) return;
// TODO(ahe): Revisit these messages. It seems like the last two should
// be `context` parameter to this message.
addProblem(templateConflictsWithMember.withArguments(name),
constructor.charOffset, noLength);
if (constructor.isFactory) {
addProblem(
templateConflictsWithFactory.withArguments("${this.name}.${name}"),
member.charOffset,
noLength);
} else {
addProblem(
templateConflictsWithConstructor
.withArguments("${this.name}.${name}"),
member.charOffset,
noLength);
}
});
scope.forEachLocalSetter((String name, Builder setter) {
Builder constructor = constructorScopeBuilder[name];
if (constructor == null || !setter.isStatic) return;
addProblem(templateConflictsWithConstructor.withArguments(name),
setter.charOffset, noLength);
addProblem(templateConflictsWithSetter.withArguments(name),
constructor.charOffset, noLength);
});
cls.procedures.sort(compareProcedures);
return cls;
}
TypeBuilder checkSupertype(TypeBuilder supertype) {
if (typeVariables == null || supertype == null) return supertype;
Message message;
for (int i = 0; i < typeVariables.length; ++i) {
int variance = computeTypeVariableBuilderVariance(
typeVariables[i], supertype, library);
if (!Variance.greaterThanOrEqual(variance, typeVariables[i].variance)) {
if (typeVariables[i].parameter.isLegacyCovariant) {
message = templateInvalidTypeVariableInSupertype.withArguments(
typeVariables[i].name,
Variance.keywordString(variance),
supertype.name);
} else {
message =
templateInvalidTypeVariableInSupertypeWithVariance.withArguments(
Variance.keywordString(typeVariables[i].variance),
typeVariables[i].name,
Variance.keywordString(variance),
supertype.name);
}
library.addProblem(message, charOffset, noLength, fileUri);
}
}
if (message != null) {
return new NamedTypeBuilder(
supertype.name,
const NullabilityBuilder.omitted(),
/* arguments = */ null,
fileUri,
charOffset)
..bind(new InvalidTypeDeclarationBuilder(supertype.name,
message.withLocation(fileUri, charOffset, noLength)));
}
return supertype;
}
void checkVarianceInField(SourceFieldBuilder fieldBuilder,
TypeEnvironment typeEnvironment, List<TypeParameter> typeParameters) {
for (TypeParameter typeParameter in typeParameters) {
int fieldVariance =
computeVariance(typeParameter, fieldBuilder.fieldType);
if (fieldBuilder.isClassInstanceMember) {
reportVariancePositionIfInvalid(fieldVariance, typeParameter,
fieldBuilder.fileUri, fieldBuilder.charOffset);
}
if (fieldBuilder.isClassInstanceMember &&
fieldBuilder.isAssignable &&
!fieldBuilder.isCovariant) {
fieldVariance = Variance.combine(Variance.contravariant, fieldVariance);
reportVariancePositionIfInvalid(fieldVariance, typeParameter,
fieldBuilder.fileUri, fieldBuilder.charOffset);
}
}
}
void checkVarianceInFunction(Procedure procedure,
TypeEnvironment typeEnvironment, List<TypeParameter> typeParameters) {
List<TypeParameter> functionTypeParameters =
procedure.function.typeParameters;
List<VariableDeclaration> positionalParameters =
procedure.function.positionalParameters;
List<VariableDeclaration> namedParameters =
procedure.function.namedParameters;
DartType returnType = procedure.function.returnType;
if (functionTypeParameters != null) {
for (TypeParameter functionParameter in functionTypeParameters) {
for (TypeParameter typeParameter in typeParameters) {
int typeVariance = Variance.combine(Variance.invariant,
computeVariance(typeParameter, functionParameter.bound));
reportVariancePositionIfInvalid(typeVariance, typeParameter, fileUri,
functionParameter.fileOffset);
}
}
}
if (positionalParameters != null) {
for (VariableDeclaration formal in positionalParameters) {
if (!formal.isCovariant) {
for (TypeParameter typeParameter in typeParameters) {
int formalVariance = Variance.combine(Variance.contravariant,
computeVariance(typeParameter, formal.type));
reportVariancePositionIfInvalid(
formalVariance, typeParameter, fileUri, formal.fileOffset);
}
}
}
}
if (namedParameters != null) {
for (VariableDeclaration named in namedParameters) {
for (TypeParameter typeParameter in typeParameters) {
int namedVariance = Variance.combine(Variance.contravariant,
computeVariance(typeParameter, named.type));
reportVariancePositionIfInvalid(
namedVariance, typeParameter, fileUri, named.fileOffset);
}
}
}
if (returnType != null) {
for (TypeParameter typeParameter in typeParameters) {
int returnTypeVariance = computeVariance(typeParameter, returnType);
reportVariancePositionIfInvalid(returnTypeVariance, typeParameter,
fileUri, procedure.function.fileOffset,
isReturnType: true);
}
}
}
void reportVariancePositionIfInvalid(
int variance, TypeParameter typeParameter, Uri fileUri, int fileOffset,
{bool isReturnType: false}) {
SourceLibraryBuilder library = this.library;
if (!typeParameter.isLegacyCovariant &&
!Variance.greaterThanOrEqual(variance, typeParameter.variance)) {
Message message;
if (isReturnType) {
message = templateInvalidTypeVariableVariancePositionInReturnType
.withArguments(Variance.keywordString(typeParameter.variance),
typeParameter.name, Variance.keywordString(variance));
} else {
message = templateInvalidTypeVariableVariancePosition.withArguments(
Variance.keywordString(typeParameter.variance),
typeParameter.name,
Variance.keywordString(variance));
}
library.reportTypeArgumentIssue(message, fileUri, fileOffset,
typeParameter: typeParameter);
}
}
void checkBoundsInSupertype(
Supertype supertype, TypeEnvironment typeEnvironment) {
SourceLibraryBuilder libraryBuilder = this.library;
Library library = libraryBuilder.library;
List<TypeArgumentIssue> issues = findTypeArgumentIssues(
new InterfaceType(
supertype.classNode, library.nonNullable, supertype.typeArguments),
typeEnvironment,
libraryBuilder.isNonNullableByDefault
? SubtypeCheckMode.withNullabilities
: SubtypeCheckMode.ignoringNullabilities,
allowSuperBounded: false,
isNonNullableByDefault: library.isNonNullableByDefault,
areGenericArgumentsAllowed:
libraryBuilder.enableGenericMetadataInLibrary);
for (TypeArgumentIssue issue in issues) {
DartType argument = issue.argument;
TypeParameter typeParameter = issue.typeParameter;
bool inferred = libraryBuilder.inferredTypes.contains(argument);
if (issue.isGenericTypeAsArgumentIssue) {
if (inferred) {
// Supertype can't be or contain super-bounded types, so null is
// passed for super-bounded hint here.
libraryBuilder.reportTypeArgumentIssue(
templateGenericFunctionTypeInferredAsActualTypeArgument
.withArguments(argument, library.isNonNullableByDefault),
fileUri,
charOffset,
typeParameter: null,
superBoundedAttempt: null,
superBoundedAttemptInverted: null);
} else {
// Supertype can't be or contain super-bounded types, so null is
// passed for super-bounded hint here.
libraryBuilder.reportTypeArgumentIssue(
messageGenericFunctionTypeUsedAsActualTypeArgument,
fileUri,
charOffset,
typeParameter: null,
superBoundedAttempt: null,
superBoundedAttemptInverted: null);
}
} else {
void reportProblem(
Template<
Message Function(DartType, DartType, String, String, String,
String, bool)>
template) {
// Supertype can't be or contain super-bounded types, so null is
// passed for super-bounded hint here.
libraryBuilder.reportTypeArgumentIssue(
template.withArguments(
argument,
typeParameter.bound,
typeParameter.name,
getGenericTypeName(issue.enclosingType),
supertype.classNode.name,
name,
library.isNonNullableByDefault),
fileUri,
charOffset,
typeParameter: typeParameter,
superBoundedAttempt: null,
superBoundedAttemptInverted: null);
}
if (inferred) {
reportProblem(templateIncorrectTypeArgumentInSupertypeInferred);
} else {
reportProblem(templateIncorrectTypeArgumentInSupertype);
}
}
}
}
void checkTypesInOutline(TypeEnvironment typeEnvironment) {
library.checkBoundsInTypeParameters(
typeEnvironment, cls.typeParameters, fileUri);
// Check in supers.
if (cls.supertype != null) {
checkBoundsInSupertype(cls.supertype, typeEnvironment);
}
if (cls.mixedInType != null) {
checkBoundsInSupertype(cls.mixedInType, typeEnvironment);
}
if (cls.implementedTypes != null) {
for (Supertype supertype in cls.implementedTypes) {
checkBoundsInSupertype(supertype, typeEnvironment);
}
}
forEach((String name, Builder builder) {
if (builder is SourceFieldBuilder) {
// Check fields.
checkVarianceInField(builder, typeEnvironment, cls.typeParameters);
library.checkTypesInField(builder, typeEnvironment);
} else if (builder is ProcedureBuilder) {
// Check procedures
checkVarianceInFunction(
builder.procedure, typeEnvironment, cls.typeParameters);
library.checkTypesInProcedureBuilder(builder, typeEnvironment);
} else {
assert(builder is DillFieldBuilder && builder.name == redirectingName,
"Unexpected member: $builder.");
}
});
forEachConstructor((String name, MemberBuilder builder) {
if (builder is ConstructorBuilder) {
library.checkTypesInConstructorBuilder(builder, typeEnvironment);
} else if (builder is RedirectingFactoryBuilder) {
library.checkTypesInRedirectingFactoryBuilder(builder, typeEnvironment);
} else if (builder is ProcedureBuilder) {
assert(builder.isFactory, "Unexpected constructor $builder.");
library.checkTypesInProcedureBuilder(builder, typeEnvironment);
} else {
assert(
// This is a synthesized constructor.
builder is DillConstructorBuilder && builder.member is Constructor,
"Unexpected constructor: $builder.");
}
}, includeInjectedConstructors: true);
}
void addSyntheticConstructor(SyntheticConstructorBuilder constructorBuilder) {
String name = constructorBuilder.name;
constructorBuilder.next = constructorScopeBuilder[name];
constructorScopeBuilder.addMember(name, constructorBuilder);
// Synthetic constructors are created after the component has been built
// so we need to add the constructor to the class.
cls.addConstructor(constructorBuilder.member);
if (constructorBuilder.isConst) {
cls.hasConstConstructor = true;
}
}
@override
int finishPatch() {
if (!isPatch) return 0;
// TODO(ahe): restore file-offset once we track both origin and patch file
// URIs. See https://github.com/dart-lang/sdk/issues/31579
cls.annotations.forEach((m) => m.fileOffset = origin.cls.fileOffset);
int count = 0;
scope.forEach((String name, Builder declaration) {
count += declaration.finishPatch();
});
constructors.forEach((String name, Builder declaration) {
count += declaration.finishPatch();
});
return count;
}
/// Return a map whose keys are the supertypes of this [SourceClassBuilder]
/// after expansion of type aliases, if any. For each supertype key, the
/// corresponding value is the type alias which was unaliased in order to
/// find the supertype, or null if the supertype was not aliased.
Map<TypeDeclarationBuilder, TypeAliasBuilder> computeDirectSupertypes(
ClassBuilder objectClass) {
final Map<TypeDeclarationBuilder, TypeAliasBuilder> result =
<TypeDeclarationBuilder, TypeAliasBuilder>{};
final TypeBuilder supertype = this.supertypeBuilder;
if (supertype != null) {
TypeDeclarationBuilder declarationBuilder = supertype.declaration;
if (declarationBuilder is TypeAliasBuilder) {
TypeAliasBuilder aliasBuilder = declarationBuilder;
NamedTypeBuilder namedBuilder = supertype;
declarationBuilder =
aliasBuilder.unaliasDeclaration(namedBuilder.arguments);
result[declarationBuilder] = aliasBuilder;
} else {
result[declarationBuilder] = null;
}
} else if (objectClass != this) {
result[objectClass] = null;
}
final List<TypeBuilder> interfaces = this.interfaceBuilders;
if (interfaces != null) {
for (int i = 0; i < interfaces.length; i++) {
TypeBuilder interface = interfaces[i];
TypeDeclarationBuilder declarationBuilder = interface.declaration;
if (declarationBuilder is TypeAliasBuilder) {
TypeAliasBuilder aliasBuilder = declarationBuilder;
NamedTypeBuilder namedBuilder = interface;
declarationBuilder =
aliasBuilder.unaliasDeclaration(namedBuilder.arguments);
result[declarationBuilder] = aliasBuilder;
} else {
result[declarationBuilder] = null;
}
}
}
final TypeBuilder mixedInTypeBuilder = this.mixedInTypeBuilder;
if (mixedInTypeBuilder != null) {
TypeDeclarationBuilder declarationBuilder =
mixedInTypeBuilder.declaration;
if (declarationBuilder is TypeAliasBuilder) {
TypeAliasBuilder aliasBuilder = declarationBuilder;
NamedTypeBuilder namedBuilder = mixedInTypeBuilder;
declarationBuilder =
aliasBuilder.unaliasDeclaration(namedBuilder.arguments);
result[declarationBuilder] = aliasBuilder;
} else {
result[declarationBuilder] = null;
}
}
return result;
}
@override
int compareTo(SourceClassBuilder other) {
int result = "$fileUri".compareTo("${other.fileUri}");
if (result != 0) return result;
return charOffset.compareTo(other.charOffset);
}
bool _addMissingNoSuchMethodForwarders(
KernelTarget target, Set<Member> existingForwarders,
{bool forSetters}) {
assert(forSetters != null);
ClassHierarchy hierarchy = target.loader.hierarchy;
List<Member> allMembers =
hierarchy.getInterfaceMembers(cls, setters: forSetters);
List<Member> concreteMembers =
hierarchy.getDispatchTargets(cls, setters: forSetters);
List<Member> declaredMembers =
hierarchy.getDeclaredMembers(cls, setters: forSetters);
Member noSuchMethod = ClassHierarchy.findMemberByName(
hierarchy.getInterfaceMembers(cls), noSuchMethodName);
bool clsHasUserDefinedNoSuchMethod =
hasUserDefinedNoSuchMethod(cls, hierarchy, target.objectClass);
bool changed = false;
// It's possible to have multiple abstract members with the same name -- as
// long as there's one with function type that's a subtype of function types
// of all other members. Such member is called "best" in the code below.
// Members with the same name are put into groups, and "best" is searched
// for in each group.
Map<Name, List<Member>> sameNameMembers = {};
for (Member member in allMembers) {
(sameNameMembers[member.name] ??= []).add(member);
}
for (Name name in sameNameMembers.keys) {
List<Member> members = sameNameMembers[name];
assert(members.isNotEmpty);
CombinedMemberSignatureBuilder combinedMemberSignature =
new CombinedMemberSignatureBuilder(hierarchy, this, members,
forSetter: forSetters);
Member member = combinedMemberSignature.canonicalMember;
if (member != null) {
if (_isForwarderRequired(
clsHasUserDefinedNoSuchMethod, member, cls, concreteMembers,
isPatch: member.fileUri != member.enclosingClass.fileUri) &&
!existingForwarders.contains(member)) {
assert(!combinedMemberSignature.needsCovarianceMerging,
"Needed covariant merging for ${members}");
if (ClassHierarchy.findMemberByName(declaredMembers, member.name) !=
null) {
_transformProcedureToNoSuchMethodForwarder(
noSuchMethod, target, member);
} else {
Procedure memberSignature =
combinedMemberSignature.createMemberFromSignature();
_transformProcedureToNoSuchMethodForwarder(
noSuchMethod, target, memberSignature);
cls.procedures.add(memberSignature);
memberSignature.parent = cls;
if (member is Procedure) {
library.forwardersOrigins.add(memberSignature);
library.forwardersOrigins.add(member);
}
}
changed = true;
}
}
}
return changed;
}
/// Adds noSuchMethod forwarding stubs to this class.
///
/// Returns `true` if the class was modified.
bool addNoSuchMethodForwarders(
KernelTarget target, ClassHierarchy hierarchy) {
// Don't install forwarders in superclasses.
if (cls.isAbstract) return false;
// Compute signatures of existing noSuchMethod forwarders in superclasses.
Set<Member> existingForwarders = new Set<Member>.identity();
Set<Member> existingSetterForwarders = new Set<Member>.identity();
{
Class nearestConcreteSuperclass = cls.superclass;
while (nearestConcreteSuperclass != null &&
nearestConcreteSuperclass.isAbstract) {
nearestConcreteSuperclass = nearestConcreteSuperclass.superclass;
}
if (nearestConcreteSuperclass != null) {
bool superHasUserDefinedNoSuchMethod = hasUserDefinedNoSuchMethod(
nearestConcreteSuperclass, hierarchy, target.objectClass);
{
List<Member> concrete =
hierarchy.getDispatchTargets(nearestConcreteSuperclass);
for (Member member
in hierarchy.getInterfaceMembers(nearestConcreteSuperclass)) {
if (_isForwarderRequired(superHasUserDefinedNoSuchMethod, member,
nearestConcreteSuperclass, concrete,
isPatch: member.fileUri != member.enclosingClass.fileUri)) {
existingForwarders.add(member);
}
}
}
{
List<Member> concreteSetters = hierarchy
.getDispatchTargets(nearestConcreteSuperclass, setters: true);
for (Member member in hierarchy
.getInterfaceMembers(nearestConcreteSuperclass, setters: true)) {
if (_isForwarderRequired(superHasUserDefinedNoSuchMethod, member,
nearestConcreteSuperclass, concreteSetters)) {
existingSetterForwarders.add(member);
}
}
}
}
}
bool changed = false;
// Install noSuchMethod forwarders for methods and getters.
changed = _addMissingNoSuchMethodForwarders(target, existingForwarders,
forSetters: false) ||
changed;
// Install noSuchMethod forwarders for setters.
changed = _addMissingNoSuchMethodForwarders(
target, existingSetterForwarders,
forSetters: true) ||
changed;
return changed;
}
/// Tells if a noSuchMethod forwarder is required for [member] in [cls].
bool _isForwarderRequired(bool hasUserDefinedNoSuchMethod, Member member,
Class cls, List<Member> concreteMembers,
{bool isPatch = false}) {
// A noSuchMethod forwarder is allowed for an abstract member if the class
// has a user-defined noSuchMethod or if the member is private and is
// defined in a different library. Private members in patches are assumed
// to be visible only to patches, so they are treated as if they were from
// another library.
bool isForwarderAllowed = hasUserDefinedNoSuchMethod ||
(member.name.isPrivate &&
cls.enclosingLibrary.compareTo(member.enclosingLibrary) != 0) ||
(member.name.isPrivate && isPatch);
// A noSuchMethod forwarder is required if it's allowed and if there's no
// concrete implementation or a forwarder already.
bool isForwarderRequired = isForwarderAllowed &&
ClassHierarchy.findMemberByName(concreteMembers, member.name) == null;
return isForwarderRequired;
}
void _transformProcedureToNoSuchMethodForwarder(
Member noSuchMethodInterface, KernelTarget target, Procedure procedure) {
String prefix = procedure.isGetter
? 'get:'
: procedure.isSetter
? 'set:'
: '';
String invocationName = prefix + procedure.name.text;
if (procedure.isSetter) invocationName += '=';
Expression invocation = target.backendTarget.instantiateInvocation(
target.loader.coreTypes,
new ThisExpression(),
invocationName,
new Arguments.forwarded(procedure.function, library.library),
procedure.fileOffset,
/*isSuper=*/ false);
Expression result;
if (library
.loader.target.backendTarget.supportsNewMethodInvocationEncoding) {
result = new InstanceInvocation(InstanceAccessKind.Instance,
new ThisExpression(), noSuchMethodName, new Arguments([invocation]),
functionType: noSuchMethodInterface.getterType,
interfaceTarget: noSuchMethodInterface)
..fileOffset = procedure.fileOffset;
} else {
result = new MethodInvocation(new ThisExpression(), noSuchMethodName,
new Arguments([invocation]), noSuchMethodInterface)
..fileOffset = procedure.fileOffset;
}
if (procedure.function.returnType is! VoidType) {
result = new AsExpression(result, procedure.function.returnType)
..isTypeError = true
..isForDynamic = true
..isForNonNullableByDefault = library.isNonNullableByDefault
..fileOffset = procedure.fileOffset;
}
procedure.function.body = new ReturnStatement(result)
..fileOffset = procedure.fileOffset;
procedure.function.body.parent = procedure.function;
procedure.function.asyncMarker = AsyncMarker.Sync;
procedure.function.dartAsyncMarker = AsyncMarker.Sync;
procedure.isAbstract = false;
procedure.stubKind = ProcedureStubKind.NoSuchMethodForwarder;
procedure.stubTarget = null;
}
void _addRedirectingConstructor(ProcedureBuilder constructorBuilder,
SourceLibraryBuilder library, Reference getterReference) {
// Add a new synthetic field to this class for representing factory
// constructors. This is used to support resolving such constructors in
// source code.
//
// The synthetic field looks like this:
//
// final _redirecting# = [c1, ..., cn];
//
// Where each c1 ... cn are an instance of [StaticGet] whose target is
// [constructor.target].
//
// TODO(ahe): Add a kernel node to represent redirecting factory bodies.
DillFieldBuilder constructorsField =
origin.scope.lookupLocalMember(redirectingName, setter: false);
if (constructorsField == null) {
ListLiteral literal = new ListLiteral(<Expression>[]);
Name name = new Name(redirectingName, library.library);
Field field = new Field.immutable(name,
isStatic: true,
isFinal: true,
initializer: literal,
fileUri: cls.fileUri,
getterReference: getterReference)
..fileOffset = cls.fileOffset;
cls.addField(field);
constructorsField = new DillFieldBuilder(field, this);
origin.scope
.addLocalMember(redirectingName, constructorsField, setter: false);
}
Field field = constructorsField.member;
ListLiteral literal = field.initializer;
literal.expressions
.add(new StaticGet(constructorBuilder.procedure)..parent = literal);
}
@override
int resolveConstructors(LibraryBuilder library) {
if (constructorReferences == null) return 0;
for (ConstructorReferenceBuilder ref in constructorReferences) {
ref.resolveIn(scope, library);
}
int count = constructorReferences.length;
if (count != 0) {
Map<String, MemberBuilder> constructors = this.constructors.local;
// Copy keys to avoid concurrent modification error.
List<String> names = constructors.keys.toList();
for (String name in names) {
Builder declaration = constructors[name];
do {
if (declaration.parent != this) {
unexpected("$fileUri", "${declaration.parent.fileUri}", charOffset,
fileUri);
}
if (declaration is RedirectingFactoryBuilder) {
// Compute the immediate redirection target, not the effective.
ConstructorReferenceBuilder redirectionTarget =
declaration.redirectionTarget;
if (redirectionTarget != null) {
Builder targetBuilder = redirectionTarget.target;
if (declaration.next == null) {
// Only the first one (that is, the last on in the linked list)
// is actually in the kernel tree. This call creates a StaticGet
// to [declaration.target] in a field `_redirecting#` which is
// only legal to do to things in the kernel tree.
Reference getterReference =
referencesFromIndexed?.lookupGetterReference(new Name(
"_redirecting#", referencesFromIndexed.library));
_addRedirectingConstructor(
declaration, library, getterReference);
}
if (targetBuilder is FunctionBuilder) {
List<DartType> typeArguments = declaration.typeArguments ??
new List<DartType>.filled(
targetBuilder
.member.enclosingClass.typeParameters.length,
const UnknownType());
declaration.setRedirectingFactoryBody(
targetBuilder.member, typeArguments);
} else if (targetBuilder is DillMemberBuilder) {
List<DartType> typeArguments = declaration.typeArguments ??
new List<DartType>.filled(
targetBuilder
.member.enclosingClass.typeParameters.length,
const UnknownType());
declaration.setRedirectingFactoryBody(
targetBuilder.member, typeArguments);
} else if (targetBuilder is AmbiguousBuilder) {
addProblem(
templateDuplicatedDeclarationUse
.withArguments(redirectionTarget.fullNameForErrors),
redirectionTarget.charOffset,
noLength);
// CoreTypes aren't computed yet, and this is the outline
// phase. So we can't and shouldn't create a method body.
declaration.body = new RedirectingFactoryBody.unresolved(
redirectionTarget.fullNameForErrors);
} else {
addProblem(
templateRedirectionTargetNotFound
.withArguments(redirectionTarget.fullNameForErrors),
redirectionTarget.charOffset,
noLength);
// CoreTypes aren't computed yet, and this is the outline
// phase. So we can't and shouldn't create a method body.
declaration.body = new RedirectingFactoryBody.unresolved(
redirectionTarget.fullNameForErrors);
}
}
}
declaration = declaration.next;
} while (declaration != null);
}
}
return count;
}
void checkOverride(Types types, Member declaredMember, Member interfaceMember,
bool isSetter, callback(Member interfaceMember, bool isSetter),
{bool isInterfaceCheck, bool declaredNeedsLegacyErasure}) {
assert(isInterfaceCheck != null);
assert(declaredNeedsLegacyErasure != null);
if (declaredMember == interfaceMember) {
return;
}
Member interfaceMemberOrigin =
interfaceMember.memberSignatureOrigin ?? interfaceMember;
if (declaredMember is Constructor || interfaceMember is Constructor) {
unimplemented(
"Constructor in override check.", declaredMember.fileOffset, fileUri);
}
if (declaredMember is Procedure && interfaceMember is Procedure) {
if (declaredMember.kind == interfaceMember.kind) {
if (declaredMember.kind == ProcedureKind.Method ||
declaredMember.kind == ProcedureKind.Operator) {
bool seenCovariant = checkMethodOverride(
types,
declaredMember,
interfaceMember,
interfaceMemberOrigin,
isInterfaceCheck,
declaredNeedsLegacyErasure);
if (seenCovariant) {
handleSeenCovariant(types, interfaceMember, isSetter, callback);
}
} else if (declaredMember.kind == ProcedureKind.Getter) {
checkGetterOverride(
types,
declaredMember,
interfaceMember,
interfaceMemberOrigin,
isInterfaceCheck,
declaredNeedsLegacyErasure);
} else if (declaredMember.kind == ProcedureKind.Setter) {
bool seenCovariant = checkSetterOverride(
types,
declaredMember,
interfaceMember,
interfaceMemberOrigin,
isInterfaceCheck,