org.jetbrains.kotlin.resolve.jvm.checkers.UpperBoundViolatedInTypealiasConstructorChecker.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2022 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.resolve.jvm.checkers
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.descriptors.impl.TypeAliasConstructorDescriptor
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.psi.KtCallExpression
import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
import org.jetbrains.kotlin.resolve.calls.checkers.CallChecker
import org.jetbrains.kotlin.resolve.calls.checkers.CallCheckerContext
import org.jetbrains.kotlin.resolve.calls.inference.components.NewTypeSubstitutorByConstructorMap
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
import org.jetbrains.kotlin.types.AbstractTypeChecker
import org.jetbrains.kotlin.types.checker.ClassicTypeCheckerState
import org.jetbrains.kotlin.types.checker.ClassicTypeCheckerStateInternals
object UpperBoundViolatedInTypealiasConstructorChecker : CallChecker {
@OptIn(ClassicTypeCheckerStateInternals::class)
override fun check(resolvedCall: ResolvedCall<*>, reportOn: PsiElement, context: CallCheckerContext) {
val resultingDescriptor = resolvedCall.resultingDescriptor as? TypeAliasConstructorDescriptor ?: return
val callExpression = reportOn.getStrictParentOfType() ?: return
val underlyingConstructedType = resultingDescriptor.underlyingConstructorDescriptor.returnType
val underlyingTypeArguments = underlyingConstructedType.arguments
val underlyingTypeParameters = resultingDescriptor.underlyingConstructorDescriptor.returnType.constructor.parameters
val state = ClassicTypeCheckerState(isErrorTypeEqualsToAnything = false)
val substitutor = NewTypeSubstitutorByConstructorMap(
underlyingTypeParameters.withIndex().associate {
Pair(it.value.typeConstructor, underlyingTypeArguments[it.index].type.unwrap())
}
)
// Note: necessary only for diagnostic duplication check
val aliasTypeParameters = resolvedCall.candidateDescriptor.typeParameters
val originalTypes = resultingDescriptor.typeAliasDescriptor.underlyingType.arguments.map { it.type }
for ((index, argumentAndParameter) in underlyingTypeArguments.zip(underlyingTypeParameters).withIndex()) {
val (argument, parameter) = argumentAndParameter
// To remove duplication of UPPER_BOUND_VIOLATED
// See createToFreshVariableSubstitutorAndAddInitialConstraints in ResolutionParts.kt, citing:
// ... if (kotlinType == typeParameter.defaultType) i else null ...
if (aliasTypeParameters.getOrNull(index)?.defaultType == originalTypes.getOrNull(index)) continue
for (upperBound in parameter.upperBounds) {
if (!AbstractTypeChecker.isSubtypeOf(state, argument.type, substitutor.safeSubstitute(upperBound.unwrap()))) {
val typeReference = callExpression.typeArguments.getOrNull(index)?.typeReference ?: continue
context.trace.report(Errors.UPPER_BOUND_VIOLATED_WARNING.on(typeReference, upperBound, argument.type))
}
}
}
}
}