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org.jetbrains.kotlin.resolve.DeclarationsChecker.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2017 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.resolve
import com.google.common.collect.ImmutableSet
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.builtins.KotlinBuiltIns
import org.jetbrains.kotlin.config.LanguageFeature
import org.jetbrains.kotlin.config.LanguageVersionSettings
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
import org.jetbrains.kotlin.descriptors.annotations.Annotations
import org.jetbrains.kotlin.diagnostics.DiagnosticFactory0
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.diagnostics.Errors.*
import org.jetbrains.kotlin.lexer.KtTokens
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.psi.psiUtil.visibilityModifier
import org.jetbrains.kotlin.resolve.BindingContext.*
import org.jetbrains.kotlin.resolve.DescriptorUtils.classCanHaveAbstractMembers
import org.jetbrains.kotlin.resolve.DescriptorUtils.classCanHaveOpenMembers
import org.jetbrains.kotlin.resolve.calls.results.TypeSpecificityComparator
import org.jetbrains.kotlin.resolve.descriptorUtil.builtIns
import org.jetbrains.kotlin.resolve.descriptorUtil.isEffectivelyExternal
import org.jetbrains.kotlin.resolve.source.KotlinSourceElement
import org.jetbrains.kotlin.types.*
import org.jetbrains.kotlin.types.checker.KotlinTypeChecker
import org.jetbrains.kotlin.types.typeUtil.*
import java.util.*
internal class DeclarationsCheckerBuilder(
private val descriptorResolver: DescriptorResolver,
private val originalModifiersChecker: ModifiersChecker,
private val annotationChecker: AnnotationChecker,
private val identifierChecker: IdentifierChecker,
private val languageVersionSettings: LanguageVersionSettings,
private val typeSpecificityComparator: TypeSpecificityComparator
) {
fun withTrace(trace: BindingTrace) =
DeclarationsChecker(descriptorResolver, originalModifiersChecker, annotationChecker, identifierChecker, trace, languageVersionSettings, typeSpecificityComparator)
}
class DeclarationsChecker(
private val descriptorResolver: DescriptorResolver,
modifiersChecker: ModifiersChecker,
private val annotationChecker: AnnotationChecker,
private val identifierChecker: IdentifierChecker,
private val trace: BindingTrace,
private val languageVersionSettings: LanguageVersionSettings,
typeSpecificityComparator: TypeSpecificityComparator
) {
private val modifiersChecker = modifiersChecker.withTrace(trace)
private val exposedChecker = ExposedVisibilityChecker(trace)
private val shadowedExtensionChecker = ShadowedExtensionChecker(typeSpecificityComparator, trace)
fun process(bodiesResolveContext: BodiesResolveContext) {
for (file in bodiesResolveContext.files) {
checkModifiersAndAnnotationsInPackageDirective(file)
annotationChecker.check(file, trace, null)
}
for ((classOrObject, classDescriptor) in bodiesResolveContext.declaredClasses.entries) {
checkSupertypesForConsistency(classDescriptor, classOrObject)
checkTypesInClassHeader(classOrObject)
when (classOrObject) {
is KtClass -> {
checkClassButNotObject(classOrObject, classDescriptor)
descriptorResolver.checkNamesInConstraints(
classOrObject, classDescriptor, classDescriptor.scopeForClassHeaderResolution, trace)
}
is KtObjectDeclaration -> {
checkObject(classOrObject, classDescriptor)
}
}
checkPrimaryConstructor(classOrObject, classDescriptor)
modifiersChecker.checkModifiersForDeclaration(classOrObject, classDescriptor)
identifierChecker.checkDeclaration(classOrObject, trace)
exposedChecker.checkClassHeader(classOrObject, classDescriptor)
}
for ((function, functionDescriptor) in bodiesResolveContext.functions.entries) {
checkFunction(function, functionDescriptor)
modifiersChecker.checkModifiersForDeclaration(function, functionDescriptor)
identifierChecker.checkDeclaration(function, trace)
}
for ((property, propertyDescriptor) in bodiesResolveContext.properties.entries) {
checkProperty(property, propertyDescriptor)
modifiersChecker.checkModifiersForDeclaration(property, propertyDescriptor)
identifierChecker.checkDeclaration(property, trace)
}
val destructuringDeclarations = bodiesResolveContext.destructuringDeclarationEntries.entries
.map { (entry, _) -> entry.parent }
.filterIsInstance()
.distinct()
for (multiDeclaration in destructuringDeclarations) {
modifiersChecker.checkModifiersForDestructuringDeclaration(multiDeclaration)
identifierChecker.checkDeclaration(multiDeclaration, trace)
}
for ((declaration, constructorDescriptor) in bodiesResolveContext.secondaryConstructors.entries) {
checkConstructorDeclaration(constructorDescriptor, declaration)
exposedChecker.checkFunction(declaration, constructorDescriptor)
}
for ((declaration, typeAliasDescriptor) in bodiesResolveContext.typeAliases.entries) {
checkTypeAliasDeclaration(declaration, typeAliasDescriptor)
modifiersChecker.checkModifiersForDeclaration(declaration, typeAliasDescriptor)
exposedChecker.checkTypeAlias(declaration, typeAliasDescriptor)
}
}
fun checkLocalTypeAliasDeclaration(declaration: KtTypeAlias, typeAliasDescriptor: TypeAliasDescriptor) {
checkTypeAliasDeclaration(declaration, typeAliasDescriptor)
modifiersChecker.checkModifiersForDeclaration(declaration, typeAliasDescriptor)
exposedChecker.checkTypeAlias(declaration, typeAliasDescriptor)
}
private fun checkTypeAliasDeclaration(declaration: KtTypeAlias, typeAliasDescriptor: TypeAliasDescriptor) {
val typeReference = declaration.getTypeReference() ?: return
checkTypeAliasExpansion(declaration, typeAliasDescriptor)
val expandedType = typeAliasDescriptor.expandedType
if (expandedType.isError) return
val expandedClassifier = expandedType.constructor.declarationDescriptor
if (expandedType.isDynamic() || expandedClassifier is TypeParameterDescriptor) {
trace.report(TYPEALIAS_SHOULD_EXPAND_TO_CLASS.on(typeReference, expandedType))
}
if (TypeUtils.contains(expandedType) { it.isArrayOfNothing()} ) {
trace.report(TYPEALIAS_EXPANDED_TO_MALFORMED_TYPE.on(typeReference, expandedType, "Array is illegal"))
}
val usedTypeAliasParameters: Set = getUsedTypeAliasParameters(expandedType, typeAliasDescriptor)
for (typeParameter in typeAliasDescriptor.declaredTypeParameters) {
if (typeParameter !in usedTypeAliasParameters) {
val source = DescriptorToSourceUtils.descriptorToDeclaration(typeParameter) as? KtTypeParameter
?: throw AssertionError("No source element for type parameter $typeParameter of $typeAliasDescriptor")
trace.report(UNUSED_TYPEALIAS_PARAMETER.on(source, typeParameter, expandedType))
}
}
if (declaration.hasModifier(KtTokens.IMPL_KEYWORD)) {
checkImplTypeAlias(declaration, typeAliasDescriptor)
}
}
private fun checkImplTypeAlias(declaration: KtTypeAlias, typeAliasDescriptor: TypeAliasDescriptor) {
val rhs = typeAliasDescriptor.underlyingType
val classDescriptor = rhs.constructor.declarationDescriptor
if (classDescriptor !is ClassDescriptor) {
trace.report(IMPL_TYPE_ALIAS_NOT_TO_CLASS.on(declaration))
return
}
if (classDescriptor.declaredTypeParameters.any { it.variance != Variance.INVARIANT }) {
trace.report(IMPL_TYPE_ALIAS_TO_CLASS_WITH_DECLARATION_SITE_VARIANCE.on(declaration))
return
}
if (rhs.arguments.any { it.projectionKind != Variance.INVARIANT || it.isStarProjection }) {
trace.report(IMPL_TYPE_ALIAS_WITH_USE_SITE_VARIANCE.on(declaration))
return
}
if (rhs.arguments.map { it.type.constructor.declarationDescriptor as? TypeParameterDescriptor } !=
typeAliasDescriptor.declaredTypeParameters) {
trace.report(IMPL_TYPE_ALIAS_WITH_COMPLEX_SUBSTITUTION.on(declaration))
return
}
}
private fun getUsedTypeAliasParameters(type: KotlinType, typeAlias: TypeAliasDescriptor): Set =
type.constituentTypes().mapNotNullTo(HashSet()) {
val descriptor = it.constructor.declarationDescriptor as? TypeParameterDescriptor
descriptor?.takeIf { it.containingDeclaration == typeAlias }
}
private class TypeAliasDeclarationCheckingReportStrategy(
private val trace: BindingTrace,
typeAliasDescriptor: TypeAliasDescriptor,
declaration: KtTypeAlias
) : TypeAliasExpansionReportStrategy {
private val typeReference = declaration.getTypeReference()
?: throw AssertionError("Incorrect type alias declaration for $typeAliasDescriptor")
override fun wrongNumberOfTypeArguments(typeAlias: TypeAliasDescriptor, numberOfParameters: Int) {
// Do nothing: this should've been reported during type resolution.
}
override fun conflictingProjection(typeAlias: TypeAliasDescriptor, typeParameter: TypeParameterDescriptor?, substitutedArgument: KotlinType) {
trace.report(CONFLICTING_PROJECTION_IN_TYPEALIAS_EXPANSION.on(typeReference, substitutedArgument))
}
override fun recursiveTypeAlias(typeAlias: TypeAliasDescriptor) {
trace.report(RECURSIVE_TYPEALIAS_EXPANSION.on(typeReference, typeAlias))
}
override fun boundsViolationInSubstitution(bound: KotlinType, unsubstitutedArgument: KotlinType, argument: KotlinType, typeParameter: TypeParameterDescriptor) {
// TODO more precise diagnostics
if (!argument.containsTypeAliasParameters() && !bound.containsTypeAliasParameters()) {
trace.report(UPPER_BOUND_VIOLATED_IN_TYPEALIAS_EXPANSION.on(typeReference, bound, argument, typeParameter))
}
}
override fun repeatedAnnotation(annotation: AnnotationDescriptor) {
val annotationEntry = (annotation.source as? KotlinSourceElement)?.psi as? KtAnnotationEntry ?: return
trace.report(REPEATED_ANNOTATION.on(annotationEntry))
}
}
private fun checkTypeAliasExpansion(declaration: KtTypeAlias, typeAliasDescriptor: TypeAliasDescriptor) {
val typeAliasExpansion = TypeAliasExpansion.createWithFormalArguments(typeAliasDescriptor)
val reportStrategy = TypeAliasDeclarationCheckingReportStrategy(trace, typeAliasDescriptor, declaration)
TypeAliasExpander(reportStrategy).expandWithoutAbbreviation(typeAliasExpansion, Annotations.EMPTY)
}
private fun checkConstructorDeclaration(constructorDescriptor: ClassConstructorDescriptor, declaration: KtConstructor<*>) {
modifiersChecker.checkModifiersForDeclaration(declaration, constructorDescriptor)
identifierChecker.checkDeclaration(declaration, trace)
checkVarargParameters(trace, constructorDescriptor)
checkConstructorVisibility(constructorDescriptor, declaration)
checkHeaderClassConstructor(constructorDescriptor, declaration)
}
private fun checkHeaderClassConstructor(constructorDescriptor: ClassConstructorDescriptor, declaration: KtConstructor<*>) {
if (!constructorDescriptor.isHeader) return
if (declaration.hasBody()) {
trace.report(HEADER_DECLARATION_WITH_BODY.on(declaration))
}
if (constructorDescriptor.containingDeclaration.kind == ClassKind.ENUM_CLASS) {
trace.report(HEADER_ENUM_CONSTRUCTOR.on(declaration))
}
if (declaration is KtPrimaryConstructor && !DescriptorUtils.isAnnotationClass(constructorDescriptor.constructedClass)) {
for (parameter in declaration.valueParameters) {
if (parameter.hasValOrVar()) {
trace.report(HEADER_CLASS_CONSTRUCTOR_PROPERTY_PARAMETER.on(parameter))
}
}
}
if (declaration is KtSecondaryConstructor) {
val delegationCall = declaration.getDelegationCall()
if (!delegationCall.isImplicit) {
trace.report(HEADER_CLASS_CONSTRUCTOR_DELEGATION_CALL.on(delegationCall))
}
}
}
private fun checkConstructorVisibility(constructorDescriptor: ClassConstructorDescriptor, declaration: KtDeclaration) {
val visibilityModifier = declaration.visibilityModifier()
if (visibilityModifier != null && visibilityModifier.node?.elementType != KtTokens.PRIVATE_KEYWORD) {
val classDescriptor = constructorDescriptor.containingDeclaration
if (classDescriptor.kind == ClassKind.ENUM_CLASS) {
trace.report(NON_PRIVATE_CONSTRUCTOR_IN_ENUM.on(visibilityModifier))
}
else if (classDescriptor.modality == Modality.SEALED) {
trace.report(NON_PRIVATE_CONSTRUCTOR_IN_SEALED.on(visibilityModifier))
}
}
}
private fun checkModifiersAndAnnotationsInPackageDirective(file: KtFile) {
val packageDirective = file.packageDirective ?: return
val modifierList = packageDirective.modifierList ?: return
for (annotationEntry in modifierList.annotationEntries) {
val calleeExpression = annotationEntry.calleeExpression
if (calleeExpression != null) {
calleeExpression.constructorReferenceExpression?.let { trace.report(UNRESOLVED_REFERENCE.on(it, it)) }
}
}
annotationChecker.check(packageDirective, trace, null)
ModifierCheckerCore.check(packageDirective, trace, descriptor = null, languageVersionSettings = languageVersionSettings)
}
private fun checkTypesInClassHeader(classOrObject: KtClassOrObject) {
fun KtTypeReference.type(): KotlinType? = trace.bindingContext.get(TYPE, this)
for (delegationSpecifier in classOrObject.superTypeListEntries) {
val typeReference = delegationSpecifier.typeReference ?: continue
typeReference.type()?.let { DescriptorResolver.checkBounds(typeReference, it, trace) }
}
if (classOrObject !is KtClass) return
val upperBoundCheckRequests = ArrayList()
for (typeParameter in classOrObject.typeParameters) {
val typeReference = typeParameter.extendsBound ?: continue
val type = typeReference.type() ?: continue
upperBoundCheckRequests.add(DescriptorResolver.UpperBoundCheckRequest(typeParameter.nameAsName, typeReference, type))
}
for (constraint in classOrObject.typeConstraints) {
val typeReference = constraint.boundTypeReference ?: continue
val type = typeReference.type() ?: continue
val name = constraint.subjectTypeParameterName?.getReferencedNameAsName() ?: continue
upperBoundCheckRequests.add(DescriptorResolver.UpperBoundCheckRequest(name, typeReference, type))
}
DescriptorResolver.checkUpperBoundTypes(trace, upperBoundCheckRequests)
for (request in upperBoundCheckRequests) {
DescriptorResolver.checkBounds(request.upperBound, request.upperBoundType, trace)
}
}
private fun checkOnlyOneTypeParameterBound(
descriptor: TypeParameterDescriptor, declaration: KtTypeParameter, owner: KtTypeParameterListOwner
) {
val upperBounds = descriptor.upperBounds
val (boundsWhichAreTypeParameters, otherBounds) = upperBounds
.map(KotlinType::constructor)
.partition { constructor -> constructor.declarationDescriptor is TypeParameterDescriptor }
.let { pair -> pair.first.toSet() to pair.second.toSet() }
if (boundsWhichAreTypeParameters.size > 1 || (boundsWhichAreTypeParameters.size == 1 && otherBounds.isNotEmpty())) {
val reportOn = if (boundsWhichAreTypeParameters.size + otherBounds.size == 2) {
// If there's only one problematic bound (either 2 type parameter bounds, or 1 type parameter bound + 1 other bound),
// report the diagnostic on that bound
val allBounds: List> =
owner.typeConstraints
.filter { constraint ->
constraint.subjectTypeParameterName?.getReferencedNameAsName() == declaration.nameAsName
}
.mapNotNull { constraint -> constraint.boundTypeReference }
.map { typeReference -> typeReference to trace.bindingContext.get(TYPE, typeReference) }
val problematicBound =
allBounds.firstOrNull { bound -> bound.second?.constructor != boundsWhichAreTypeParameters.first() }
problematicBound?.first ?: declaration
}
else {
// Otherwise report the diagnostic on the type parameter declaration
declaration
}
trace.report(BOUNDS_NOT_ALLOWED_IF_BOUNDED_BY_TYPE_PARAMETER.on(reportOn))
}
}
private fun checkSupertypesForConsistency(classifier: ClassifierDescriptor, sourceElement: PsiElement) {
if (classifier is TypeParameterDescriptor) {
val immediateUpperBounds = classifier.upperBounds.map { it.constructor }
if (immediateUpperBounds.size != immediateUpperBounds.toSet().size) {
// If there are duplicate type constructors among the _immediate_ upper bounds,
// then the REPEATED_BOUNDS diagnostic would be already reported for those bounds of this type parameter
return
}
}
val multiMap = SubstitutionUtils.buildDeepSubstitutionMultimap(classifier.defaultType)
for ((typeParameterDescriptor, projections) in multiMap.asMap()) {
if (projections.size <= 1) continue
// Immediate arguments of supertypes cannot be projected
val conflictingTypes = projections.map { it.type }.toMutableSet()
removeDuplicateTypes(conflictingTypes)
if (conflictingTypes.size <= 1) continue
val containingDeclaration = typeParameterDescriptor.containingDeclaration as? ClassDescriptor
?: throw AssertionError("Not a class descriptor: " + typeParameterDescriptor.containingDeclaration)
if (sourceElement is KtClassOrObject) {
val delegationSpecifierList = sourceElement.getSuperTypeList() ?: continue
trace.report(INCONSISTENT_TYPE_PARAMETER_VALUES.on(
delegationSpecifierList, typeParameterDescriptor, containingDeclaration, conflictingTypes
))
}
else if (sourceElement is KtTypeParameter) {
trace.report(INCONSISTENT_TYPE_PARAMETER_BOUNDS.on(
sourceElement, typeParameterDescriptor, containingDeclaration, conflictingTypes
))
}
}
}
private fun checkObject(declaration: KtObjectDeclaration, classDescriptor: ClassDescriptorWithResolutionScopes) {
checkOpenMembers(classDescriptor)
if (declaration.isLocal && !declaration.isCompanion() && !declaration.isObjectLiteral()) {
trace.report(LOCAL_OBJECT_NOT_ALLOWED.on(declaration, classDescriptor))
}
}
private fun checkClassButNotObject(aClass: KtClass, classDescriptor: ClassDescriptorWithResolutionScopes) {
checkOpenMembers(classDescriptor)
checkTypeParameters(aClass)
checkTypeParameterConstraints(aClass)
FiniteBoundRestrictionChecker.check(aClass, classDescriptor, trace)
NonExpansiveInheritanceRestrictionChecker.check(aClass, classDescriptor, trace)
when {
aClass.isInterface() -> {
checkConstructorInInterface(aClass)
checkMethodsOfAnyInInterface(classDescriptor)
if (aClass.isLocal && classDescriptor.containingDeclaration !is ClassDescriptor) {
trace.report(LOCAL_INTERFACE_NOT_ALLOWED.on(aClass, classDescriptor))
}
}
classDescriptor.kind == ClassKind.ANNOTATION_CLASS -> {
checkAnnotationClassWithBody(aClass)
checkValOnAnnotationParameter(aClass)
}
aClass is KtEnumEntry -> checkEnumEntry(aClass, classDescriptor)
}
}
private fun checkPrimaryConstructor(classOrObject: KtClassOrObject, classDescriptor: ClassDescriptor) {
val primaryConstructor = classDescriptor.unsubstitutedPrimaryConstructor ?: return
val declaration = classOrObject.primaryConstructor ?: return
for (parameter in declaration.valueParameters) {
trace.get(BindingContext.PRIMARY_CONSTRUCTOR_PARAMETER, parameter)?.let {
modifiersChecker.checkModifiersForDeclaration(parameter, it)
checkPropertyLateInit(parameter, it)
}
}
if (!declaration.hasConstructorKeyword()) {
declaration.modifierList?.let { trace.report(MISSING_CONSTRUCTOR_KEYWORD.on(it)) }
}
if (declaration.valueParameterList == null) {
declaration.getConstructorKeyword()?.let { trace.report(MISSING_CONSTRUCTOR_BRACKETS.on(it)) }
}
if (classOrObject !is KtClass) {
trace.report(CONSTRUCTOR_IN_OBJECT.on(declaration))
}
checkConstructorDeclaration(primaryConstructor, declaration)
}
private fun checkTypeParameters(typeParameterListOwner: KtTypeParameterListOwner) {
// TODO: Support annotation for type parameters
for (jetTypeParameter in typeParameterListOwner.typeParameters) {
AnnotationResolverImpl.reportUnsupportedAnnotationForTypeParameter(jetTypeParameter, trace)
trace.get(TYPE_PARAMETER, jetTypeParameter)?.let { DescriptorResolver.checkConflictingUpperBounds(trace, it, jetTypeParameter) }
}
}
private fun checkTypeParameterConstraints(typeParameterListOwner: KtTypeParameterListOwner) {
val constraints = typeParameterListOwner.typeConstraints
if (constraints.isEmpty()) return
for (typeParameter in typeParameterListOwner.typeParameters) {
if (typeParameter.extendsBound != null && hasConstraints(typeParameter, constraints)) {
trace.report(MISPLACED_TYPE_PARAMETER_CONSTRAINTS.on(typeParameter))
}
val typeParameterDescriptor = trace.get(TYPE_PARAMETER, typeParameter) ?: continue
checkSupertypesForConsistency(typeParameterDescriptor, typeParameter)
checkOnlyOneTypeParameterBound(typeParameterDescriptor, typeParameter, typeParameterListOwner)
}
}
private fun checkConstructorInInterface(klass: KtClass) {
klass.primaryConstructor?.let { trace.report(CONSTRUCTOR_IN_INTERFACE.on(it)) }
}
private fun checkMethodsOfAnyInInterface(classDescriptor: ClassDescriptorWithResolutionScopes) {
for (declaredCallableMember in classDescriptor.declaredCallableMembers) {
if (declaredCallableMember !is FunctionDescriptor) continue
val declaration = DescriptorToSourceUtils.descriptorToDeclaration(declaredCallableMember)
if (declaration !is KtNamedFunction) continue
if (isHidingParentMemberIfPresent(declaredCallableMember)) continue
if (isImplementingMethodOfAny(declaredCallableMember)) {
trace.report(METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE.on(declaration))
}
}
}
private fun checkAnnotationClassWithBody(classOrObject: KtClassOrObject) {
classOrObject.getBody()?.let { trace.report(ANNOTATION_CLASS_WITH_BODY.on(it)) }
}
private fun checkValOnAnnotationParameter(aClass: KtClass) {
for (parameter in aClass.primaryConstructorParameters) {
if (!parameter.hasValOrVar()) {
trace.report(MISSING_VAL_ON_ANNOTATION_PARAMETER.on(parameter))
}
else if (parameter.isMutable) {
trace.report(VAR_ANNOTATION_PARAMETER.on(parameter))
}
}
}
private fun checkOpenMembers(classDescriptor: ClassDescriptorWithResolutionScopes) {
if (classCanHaveOpenMembers(classDescriptor)) return
for (memberDescriptor in classDescriptor.declaredCallableMembers) {
if (memberDescriptor.kind != CallableMemberDescriptor.Kind.DECLARATION) continue
val member = DescriptorToSourceUtils.descriptorToDeclaration(memberDescriptor) as? KtNamedDeclaration
if (member != null && member.hasModifier(KtTokens.OPEN_KEYWORD)) {
if (classDescriptor.kind == ClassKind.OBJECT) {
trace.report(NON_FINAL_MEMBER_IN_OBJECT.on(member))
}
else {
trace.report(NON_FINAL_MEMBER_IN_FINAL_CLASS.on(member))
}
}
}
}
private fun checkProperty(property: KtProperty, propertyDescriptor: PropertyDescriptor) {
val containingDeclaration = propertyDescriptor.containingDeclaration
if (containingDeclaration is ClassDescriptor) {
checkMemberProperty(property, propertyDescriptor, containingDeclaration)
}
checkPropertyLateInit(property, propertyDescriptor)
checkPropertyInitializer(property, propertyDescriptor)
checkAccessors(property, propertyDescriptor)
checkTypeParameterConstraints(property)
exposedChecker.checkProperty(property, propertyDescriptor)
shadowedExtensionChecker.checkDeclaration(property, propertyDescriptor)
checkPropertyTypeParametersAreUsedInReceiverType(propertyDescriptor)
checkImplicitCallableType(property, propertyDescriptor)
}
private fun checkPropertyTypeParametersAreUsedInReceiverType(descriptor: PropertyDescriptor) {
val allTypeParameters = descriptor.typeParameters.toSet()
val allAccessibleTypeParameters = HashSet()
fun addAccessibleTypeParametersFromType(type: KotlinType?) {
TypeUtils.contains(type) {
val declarationDescriptor = it.constructor.declarationDescriptor
if (declarationDescriptor is TypeParameterDescriptor && declarationDescriptor in allTypeParameters) {
if (allAccessibleTypeParameters.add(declarationDescriptor)) {
declarationDescriptor.upperBounds.forEach(::addAccessibleTypeParametersFromType)
}
}
false
}
}
addAccessibleTypeParametersFromType(descriptor.extensionReceiverParameter?.type)
val typeParametersInaccessibleFromReceiver = allTypeParameters - allAccessibleTypeParameters
for (typeParameter in typeParametersInaccessibleFromReceiver) {
val typeParameterPsi = DescriptorToSourceUtils.getSourceFromDescriptor(typeParameter)
if (typeParameterPsi is KtTypeParameter) {
trace.report(TYPE_PARAMETER_OF_PROPERTY_NOT_USED_IN_RECEIVER.on(typeParameterPsi))
}
}
}
private fun checkPropertyLateInit(property: KtCallableDeclaration, propertyDescriptor: PropertyDescriptor) {
val modifierList = property.modifierList ?: return
val modifier = modifierList.getModifier(KtTokens.LATEINIT_KEYWORD) ?: return
if (!propertyDescriptor.isVar) {
trace.report(INAPPLICABLE_LATEINIT_MODIFIER.on(modifier, "is allowed only on mutable properties"))
}
var returnTypeIsNullable = true
var returnTypeIsPrimitive = true
val returnType = propertyDescriptor.returnType
if (returnType != null) {
returnTypeIsNullable = TypeUtils.isNullableType(returnType)
returnTypeIsPrimitive = KotlinBuiltIns.isPrimitiveType(returnType)
}
if (returnTypeIsNullable) {
trace.report(INAPPLICABLE_LATEINIT_MODIFIER.on(modifier, "is not allowed on nullable properties"))
}
if (returnTypeIsPrimitive) {
trace.report(INAPPLICABLE_LATEINIT_MODIFIER.on(modifier, "is not allowed on primitive type properties"))
}
val isAbstract = propertyDescriptor.modality == Modality.ABSTRACT
if (isAbstract) {
trace.report(INAPPLICABLE_LATEINIT_MODIFIER.on(modifier, "is not allowed on abstract properties"))
}
if (property is KtParameter) {
trace.report(INAPPLICABLE_LATEINIT_MODIFIER.on(modifier, "is not allowed on primary constructor parameters"))
}
var hasDelegateExpressionOrInitializer = false
if (property is KtProperty && property.hasDelegateExpressionOrInitializer()) {
hasDelegateExpressionOrInitializer = true
trace.report(INAPPLICABLE_LATEINIT_MODIFIER.on(modifier,
"is not allowed on properties with initializer or on delegated properties"))
}
val hasAccessorImplementation = propertyDescriptor.hasAccessorImplementation()
if (!hasDelegateExpressionOrInitializer && hasAccessorImplementation) {
trace.report(INAPPLICABLE_LATEINIT_MODIFIER.on(modifier, "is not allowed on properties with a custom getter or setter"))
}
val hasBackingField = trace.bindingContext.get(BindingContext.BACKING_FIELD_REQUIRED, propertyDescriptor) ?: false
if (!isAbstract && !hasAccessorImplementation && !hasDelegateExpressionOrInitializer && !hasBackingField) {
trace.report(INAPPLICABLE_LATEINIT_MODIFIER.on(modifier, "is not allowed on properties without backing field"))
}
if (propertyDescriptor.extensionReceiverParameter != null) {
trace.report(INAPPLICABLE_LATEINIT_MODIFIER.on(modifier, "is not allowed on extension properties"))
}
}
private fun checkMemberProperty(
property: KtProperty,
propertyDescriptor: PropertyDescriptor,
classDescriptor: ClassDescriptor) {
val modifierList = property.modifierList
if (modifierList != null) {
if (modifierList.hasModifier(KtTokens.ABSTRACT_KEYWORD)) {
//has abstract modifier
if (!classCanHaveAbstractMembers(classDescriptor)) {
trace.report(ABSTRACT_PROPERTY_IN_NON_ABSTRACT_CLASS.on(property, property.name ?: "", classDescriptor))
return
}
}
else if (classDescriptor.kind == ClassKind.INTERFACE &&
modifierList.hasModifier(KtTokens.OPEN_KEYWORD) &&
propertyDescriptor.modality == Modality.ABSTRACT) {
trace.report(REDUNDANT_OPEN_IN_INTERFACE.on(property))
}
}
if (propertyDescriptor.modality == Modality.ABSTRACT) {
property.initializer?.let { trace.report(ABSTRACT_PROPERTY_WITH_INITIALIZER.on(it)) }
property.delegate?.let { trace.report(ABSTRACT_DELEGATED_PROPERTY.on(it)) }
val getter = property.getter
if (getter != null && getter.hasBody()) {
trace.report(ABSTRACT_PROPERTY_WITH_GETTER.on(getter))
}
val setter = property.setter
if (setter != null && setter.hasBody()) {
trace.report(ABSTRACT_PROPERTY_WITH_SETTER.on(setter))
}
}
}
private fun checkPropertyInitializer(property: KtProperty, propertyDescriptor: PropertyDescriptor) {
val hasAccessorImplementation = propertyDescriptor.hasAccessorImplementation()
val containingDeclaration = propertyDescriptor.containingDeclaration
val inInterface = DescriptorUtils.isInterface(containingDeclaration)
if (propertyDescriptor.modality == Modality.ABSTRACT) {
if (!property.hasDelegateExpressionOrInitializer() && property.typeReference == null) {
trace.report(PROPERTY_WITH_NO_TYPE_NO_INITIALIZER.on(property))
}
if (inInterface && property.hasModifier(KtTokens.PRIVATE_KEYWORD) && !property.hasModifier(KtTokens.ABSTRACT_KEYWORD)) {
trace.report(PRIVATE_PROPERTY_IN_INTERFACE.on(property))
}
return
}
val backingFieldRequired = trace.bindingContext.get(BindingContext.BACKING_FIELD_REQUIRED, propertyDescriptor) ?: false
if (inInterface && backingFieldRequired && hasAccessorImplementation) {
trace.report(BACKING_FIELD_IN_INTERFACE.on(property))
}
val initializer = property.initializer
val delegate = property.delegate
val isHeader = propertyDescriptor.isHeader
if (initializer != null) {
when {
inInterface -> trace.report(PROPERTY_INITIALIZER_IN_INTERFACE.on(initializer))
isHeader -> trace.report(HEADER_PROPERTY_INITIALIZER.on(initializer))
!backingFieldRequired -> trace.report(PROPERTY_INITIALIZER_NO_BACKING_FIELD.on(initializer))
property.receiverTypeReference != null -> trace.report(EXTENSION_PROPERTY_WITH_BACKING_FIELD.on(initializer))
}
}
else if (delegate != null) {
if (inInterface) {
trace.report(DELEGATED_PROPERTY_IN_INTERFACE.on(delegate))
}
}
else {
val isUninitialized = trace.bindingContext.get(BindingContext.IS_UNINITIALIZED, propertyDescriptor) ?: false
val isExternal = propertyDescriptor.isEffectivelyExternal()
if (backingFieldRequired && !inInterface && !propertyDescriptor.isLateInit && !isHeader && isUninitialized && !isExternal) {
if (propertyDescriptor.extensionReceiverParameter != null && !hasAccessorImplementation) {
trace.report(EXTENSION_PROPERTY_MUST_HAVE_ACCESSORS_OR_BE_ABSTRACT.on(property))
}
else if (containingDeclaration !is ClassDescriptor || hasAccessorImplementation) {
trace.report(MUST_BE_INITIALIZED.on(property))
}
else {
trace.report(MUST_BE_INITIALIZED_OR_BE_ABSTRACT.on(property))
}
}
else if (property.typeReference == null && !languageVersionSettings.supportsFeature(LanguageFeature.ShortSyntaxForPropertyGetters)) {
trace.report(Errors.UNSUPPORTED_FEATURE.on(property, LanguageFeature.ShortSyntaxForPropertyGetters to languageVersionSettings))
}
else if (noExplicitTypeOrGetterType(property)) {
trace.report(PROPERTY_WITH_NO_TYPE_NO_INITIALIZER.on(property))
}
if (backingFieldRequired && !inInterface && propertyDescriptor.isLateInit && !isUninitialized &&
trace[MUST_BE_LATEINIT, propertyDescriptor] != true) {
trace.report(UNNECESSARY_LATEINIT.on(property))
}
}
}
private fun noExplicitTypeOrGetterType(property: KtProperty) =
property.typeReference == null
&& (property.getter == null || (property.getter!!.hasBlockBody() && property.getter!!.returnTypeReference == null))
fun checkFunction(function: KtNamedFunction, functionDescriptor: SimpleFunctionDescriptor) {
val typeParameterList = function.typeParameterList
val nameIdentifier = function.nameIdentifier
if (typeParameterList != null && nameIdentifier != null &&
typeParameterList.textRange.startOffset > nameIdentifier.textRange.startOffset) {
trace.report(DEPRECATED_TYPE_PARAMETER_SYNTAX.on(typeParameterList))
}
checkTypeParameterConstraints(function)
checkImplicitCallableType(function, functionDescriptor)
exposedChecker.checkFunction(function, functionDescriptor)
checkVarargParameters(trace, functionDescriptor)
val containingDescriptor = functionDescriptor.containingDeclaration
val hasAbstractModifier = function.hasModifier(KtTokens.ABSTRACT_KEYWORD)
val hasExternalModifier = functionDescriptor.isEffectivelyExternal()
if (containingDescriptor is ClassDescriptor) {
val inInterface = containingDescriptor.kind == ClassKind.INTERFACE
val isHeaderClass = containingDescriptor.isHeader
if (hasAbstractModifier && !classCanHaveAbstractMembers(containingDescriptor)) {
trace.report(ABSTRACT_FUNCTION_IN_NON_ABSTRACT_CLASS.on(function, functionDescriptor.name.asString(), containingDescriptor))
}
val hasBody = function.hasBody()
if (hasBody && hasAbstractModifier) {
trace.report(ABSTRACT_FUNCTION_WITH_BODY.on(function, functionDescriptor))
}
if (!hasBody && inInterface) {
if (function.hasModifier(KtTokens.PRIVATE_KEYWORD)) {
trace.report(PRIVATE_FUNCTION_WITH_NO_BODY.on(function, functionDescriptor))
}
if (!hasAbstractModifier && function.hasModifier(KtTokens.OPEN_KEYWORD)) {
trace.report(REDUNDANT_OPEN_IN_INTERFACE.on(function))
}
}
if (!hasBody && !hasAbstractModifier && !hasExternalModifier && !inInterface && !isHeaderClass) {
trace.report(NON_ABSTRACT_FUNCTION_WITH_NO_BODY.on(function, functionDescriptor))
}
}
else /* top-level only */ {
if (!function.hasBody() && !hasAbstractModifier && !hasExternalModifier && !functionDescriptor.isHeader) {
trace.report(NON_MEMBER_FUNCTION_NO_BODY.on(function, functionDescriptor))
}
}
if (functionDescriptor.isHeader) {
checkHeaderFunction(function)
}
shadowedExtensionChecker.checkDeclaration(function, functionDescriptor)
}
private fun checkHeaderFunction(function: KtNamedFunction) {
if (function.hasBody()) {
trace.report(HEADER_DECLARATION_WITH_BODY.on(function))
}
for (parameter in function.valueParameters) {
if (parameter.hasDefaultValue()) {
trace.report(HEADER_DECLARATION_WITH_DEFAULT_PARAMETER.on(parameter))
}
}
}
private fun checkImplicitCallableType(declaration: KtCallableDeclaration, descriptor: CallableDescriptor) {
descriptor.returnType?.unwrap()?.let {
val target = declaration.nameIdentifier ?: declaration
if (declaration.typeReference == null) {
if (it.isNothing() && !declaration.hasModifier(KtTokens.OVERRIDE_KEYWORD)) {
trace.report(
(if (declaration is KtProperty) IMPLICIT_NOTHING_PROPERTY_TYPE else IMPLICIT_NOTHING_RETURN_TYPE).on(target)
)
}
if (it.contains { type -> type.constructor is IntersectionTypeConstructor }) {
trace.report(IMPLICIT_INTERSECTION_TYPE.on(target, it))
}
}
else if (it.isNothing() && it is AbbreviatedType) {
trace.report(
(if (declaration is KtProperty) ABBREVIATED_NOTHING_PROPERTY_TYPE else ABBREVIATED_NOTHING_RETURN_TYPE).on(target)
)
}
}
}
private fun checkAccessors(property: KtProperty, propertyDescriptor: PropertyDescriptor) {
for (accessorDescriptor in propertyDescriptor.accessors) {
val accessor = if (accessorDescriptor is PropertyGetterDescriptor) property.getter else property.setter
if (accessor != null) {
modifiersChecker.checkModifiersForDeclaration(accessor, accessorDescriptor)
identifierChecker.checkDeclaration(accessor, trace)
}
else {
modifiersChecker.runDeclarationCheckers(property, accessorDescriptor)
}
}
checkAccessor(propertyDescriptor, property.getter, propertyDescriptor.getter)
checkAccessor(propertyDescriptor, property.setter, propertyDescriptor.setter)
}
private fun reportVisibilityModifierDiagnostics(tokens: Collection, diagnostic: DiagnosticFactory0) {
for (token in tokens) {
trace.report(diagnostic.on(token))
}
}
private fun checkAccessor(
propertyDescriptor: PropertyDescriptor,
accessor: KtPropertyAccessor?,
accessorDescriptor: PropertyAccessorDescriptor?
) {
if (accessor == null || accessorDescriptor == null) return
if (propertyDescriptor.isHeader && accessor.hasBody()) {
trace.report(HEADER_DECLARATION_WITH_BODY.on(accessor))
}
val accessorModifierList = accessor.modifierList ?: return
val tokens = modifiersChecker.getTokensCorrespondingToModifiers(
accessorModifierList,
setOf(KtTokens.PUBLIC_KEYWORD, KtTokens.PROTECTED_KEYWORD, KtTokens.PRIVATE_KEYWORD, KtTokens.INTERNAL_KEYWORD)
)
if (accessor.isGetter) {
if (accessorDescriptor.visibility != propertyDescriptor.visibility) {
reportVisibilityModifierDiagnostics(tokens.values, Errors.GETTER_VISIBILITY_DIFFERS_FROM_PROPERTY_VISIBILITY)
}
else {
reportVisibilityModifierDiagnostics(tokens.values, Errors.REDUNDANT_MODIFIER_IN_GETTER)
}
}
else {
if (propertyDescriptor.isOverridable
&& accessorDescriptor.visibility == Visibilities.PRIVATE
&& propertyDescriptor.visibility != Visibilities.PRIVATE) {
if (propertyDescriptor.modality == Modality.ABSTRACT) {
reportVisibilityModifierDiagnostics(tokens.values, Errors.PRIVATE_SETTER_FOR_ABSTRACT_PROPERTY)
}
else {
reportVisibilityModifierDiagnostics(tokens.values, Errors.PRIVATE_SETTER_FOR_OPEN_PROPERTY)
}
}
else {
val compare = Visibilities.compare(accessorDescriptor.visibility, propertyDescriptor.visibility)
if (compare == null || compare > 0) {
reportVisibilityModifierDiagnostics(tokens.values, Errors.SETTER_VISIBILITY_INCONSISTENT_WITH_PROPERTY_VISIBILITY)
}
}
}
}
private fun checkEnumEntry(enumEntry: KtEnumEntry, enumEntryClass: ClassDescriptor) {
val enumClass = enumEntryClass.containingDeclaration as ClassDescriptor
if (DescriptorUtils.isEnumClass(enumClass)) {
if (enumClass.isHeader) {
if (enumEntry.getBody() != null) {
trace.report(HEADER_ENUM_ENTRY_WITH_BODY.on(enumEntry))
}
}
}
else {
assert(DescriptorUtils.isInterface(enumClass)) { "Enum entry should be declared in enum class: " + enumEntryClass }
}
}
private fun checkVarargParameters(trace: BindingTrace, callableDescriptor: CallableDescriptor) {
val varargParameters = callableDescriptor.valueParameters.filter { it.varargElementType != null }
if (varargParameters.size > 1) {
for (parameter in varargParameters) {
val parameterDeclaration = DescriptorToSourceUtils.descriptorToDeclaration(parameter) as? KtParameter ?: continue
trace.report(MULTIPLE_VARARG_PARAMETERS.on(parameterDeclaration))
}
}
val nullableNothing = callableDescriptor.builtIns.nullableNothingType
for (parameter in varargParameters) {
val varargElementType = parameter.varargElementType!!.upperIfFlexible()
if (KotlinTypeChecker.DEFAULT.isSubtypeOf(varargElementType, nullableNothing)) {
val parameterDeclaration = DescriptorToSourceUtils.descriptorToDeclaration(parameter) as? KtParameter ?: continue
trace.report(FORBIDDEN_VARARG_PARAMETER_TYPE.on(parameterDeclaration, varargElementType))
}
}
}
companion object {
private fun removeDuplicateTypes(conflictingTypes: MutableSet) {
val iterator = conflictingTypes.iterator()
while (iterator.hasNext()) {
val type = iterator.next()
for (otherType in conflictingTypes) {
val subtypeOf = KotlinTypeChecker.DEFAULT.equalTypes(type, otherType)
if (type !== otherType && subtypeOf) {
iterator.remove()
break
}
}
}
}
private fun hasConstraints(typeParameter: KtTypeParameter, constraints: List): Boolean {
if (typeParameter.name == null) return false
return constraints.any { it.subjectTypeParameterName?.text == typeParameter.name }
}
private val METHOD_OF_ANY_NAMES = ImmutableSet.of("toString", "hashCode", "equals")
private fun isImplementingMethodOfAny(member: CallableMemberDescriptor): Boolean {
if (!METHOD_OF_ANY_NAMES.contains(member.name.asString())) return false
if (member.modality == Modality.ABSTRACT) return false
return isImplementingMethodOfAnyInternal(member, HashSet())
}
private fun isImplementingMethodOfAnyInternal(member: CallableMemberDescriptor, visitedClasses: MutableSet): Boolean {
for (overridden in member.overriddenDescriptors) {
val containingDeclaration = overridden.containingDeclaration
if (containingDeclaration !is ClassDescriptor) continue
if (visitedClasses.contains(containingDeclaration)) continue
if (DescriptorUtils.getFqName(containingDeclaration) == KotlinBuiltIns.FQ_NAMES.any) {
return true
}
if (isHidingParentMemberIfPresent(overridden)) continue
visitedClasses.add(containingDeclaration)
if (isImplementingMethodOfAnyInternal(overridden, visitedClasses)) {
return true
}
}
return false
}
private fun isHidingParentMemberIfPresent(member: CallableMemberDescriptor): Boolean {
val declaration = DescriptorToSourceUtils.descriptorToDeclaration(member) as? KtNamedDeclaration ?: return false
val modifierList = declaration.modifierList ?: return true
return !modifierList.hasModifier(KtTokens.OVERRIDE_KEYWORD)
}
private fun PropertyDescriptor.hasAccessorImplementation(): Boolean {
getter?.let { if (it.hasBody()) return true }
setter?.let { if (it.hasBody()) return true }
return false
}
}
}
