org.jetbrains.kotlin.resolve.checkers.TailrecFunctionChecker.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2019 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.checkers

import org.jetbrains.kotlin.config.LanguageFeature
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.psi.KtDeclaration
import org.jetbrains.kotlin.psi.KtNamedFunction
import org.jetbrains.kotlin.resolve.isEffectivelyFinal

object TailrecFunctionChecker : DeclarationChecker {
    override fun check(declaration: KtDeclaration, descriptor: DeclarationDescriptor, context: DeclarationCheckerContext) {
        if (declaration !is KtNamedFunction || descriptor !is FunctionDescriptor || !descriptor.isTailrec) return

        if (descriptor.isEffectivelyFinal(false)) return

        if (!context.languageVersionSettings.supportsFeature(LanguageFeature.ProhibitTailrecOnVirtualMember)) {
            context.trace.report(Errors.TAILREC_ON_VIRTUAL_MEMBER.on(declaration))
        } else {
            context.trace.report(Errors.TAILREC_ON_VIRTUAL_MEMBER_ERROR.on(declaration))
        }
    }
}