org.jetbrains.kotlin.fir.analysis.checkers.declaration.FirPrimaryConstructorSuperTypeChecker.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.fir.analysis.checkers.declaration
import org.jetbrains.kotlin.KtFakeSourceElementKind
import org.jetbrains.kotlin.KtNodeTypes
import org.jetbrains.kotlin.fir.analysis.checkers.SourceNavigator
import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
import org.jetbrains.kotlin.fir.analysis.checkers.toRegularClassSymbol
import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
import org.jetbrains.kotlin.diagnostics.reportOn
import org.jetbrains.kotlin.fir.declarations.FirRegularClass
import org.jetbrains.kotlin.fir.declarations.utils.isInterface
import org.jetbrains.kotlin.fir.declarations.primaryConstructorIfAny
import org.jetbrains.kotlin.fir.symbols.impl.FirConstructorSymbol
import org.jetbrains.kotlin.fir.types.*
import org.jetbrains.kotlin.fir.types.impl.FirImplicitAnyTypeRef
import org.jetbrains.kotlin.name.StandardClassIds
import org.jetbrains.kotlin.utils.addToStdlib.lastIsInstanceOrNull
/** Checker on super type declarations in the primary constructor of a class declaration. */
object FirPrimaryConstructorSuperTypeChecker : FirRegularClassChecker() {
override fun check(declaration: FirRegularClass, context: CheckerContext, reporter: DiagnosticReporter) {
if (declaration.isInterface) {
with(SourceNavigator.forElement(declaration)) {
for (superTypeRef in declaration.superTypeRefs) {
if (superTypeRef.isInConstructorCallee()) {
reporter.reportOn(superTypeRef.source, FirErrors.SUPERTYPE_INITIALIZED_IN_INTERFACE, context)
}
}
}
return
}
val primaryConstructorSymbol = declaration.primaryConstructorIfAny(context.session)
if (primaryConstructorSymbol == null) {
checkSupertypeInitializedWithoutPrimaryConstructor(declaration, reporter, context)
} else {
checkSuperTypeNotInitialized(primaryConstructorSymbol, declaration, context, reporter)
}
}
/**
* SUPERTYPE_NOT_INITIALIZED is reported on code like the following. It's skipped if `A` has `()` after it, in which case any
* diagnostics for that constructor call will be reported, if applicable.
*
* ```
* open class A
* class B : A
* ```
*/
private fun checkSuperTypeNotInitialized(
primaryConstructorSymbol: FirConstructorSymbol,
regularClass: FirRegularClass,
context: CheckerContext,
reporter: DiagnosticReporter
) {
val containingClass = context.containingDeclarations.lastIsInstanceOrNull()
val delegatedConstructorCall = primaryConstructorSymbol.resolvedDelegatedConstructorCall ?: return
// No need to check implicit call to the constructor of `kotlin.Any`.
val constructedTypeRef = delegatedConstructorCall.constructedTypeRef
if (constructedTypeRef is FirImplicitAnyTypeRef) return
val superClassSymbol = constructedTypeRef.coneType.toRegularClassSymbol(context.session) ?: return
// Subclassing a singleton should be reported as SINGLETON_IN_SUPERTYPE
if (superClassSymbol.classKind.isSingleton) return
if (regularClass.isEffectivelyExpect(containingClass, context) ||
regularClass.isEffectivelyExternal(containingClass, context)
) {
return
}
val delegatedCallSource = delegatedConstructorCall.source ?: return
if (delegatedCallSource.kind !is KtFakeSourceElementKind) return
if (superClassSymbol.classId == StandardClassIds.Enum) return
if (delegatedCallSource.elementType != KtNodeTypes.SUPER_TYPE_CALL_ENTRY) {
reporter.reportOn(constructedTypeRef.source, FirErrors.SUPERTYPE_NOT_INITIALIZED, context)
}
}
/**
* SUPERTYPE_INITIALIZED_WITHOUT_PRIMARY_CONSTRUCTOR is reported on code like the following, where `B` does not have a primary
* constructor, in which case, one can not call the delegated constructor of `A` in the super type list. `B` doesn't have a primary
* constructor because it doesn't declare it, nor is it implicitly created in presence of a explicitly declared constructor inside the
* class body.
*
* ```
* open class A
* class B : A() {
* constructor()
* }
* ```
*/
private fun checkSupertypeInitializedWithoutPrimaryConstructor(
regularClass: FirRegularClass,
reporter: DiagnosticReporter,
context: CheckerContext
) {
with(SourceNavigator.forElement(regularClass)) {
for (superTypeRef in regularClass.superTypeRefs) {
if (superTypeRef.isInConstructorCallee()) {
reporter.reportOn(regularClass.source, FirErrors.SUPERTYPE_INITIALIZED_WITHOUT_PRIMARY_CONSTRUCTOR, context)
}
}
}
}
}