org.jetbrains.kotlin.resolve.jvm.checkers.JvmSyntheticAssignmentChecker.kt Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of kotlin-compiler Show documentation
the Kotlin compiler
There is a newer version: 2.1.0-RC
/*
 * 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 org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.psi.KtBinaryExpression
import org.jetbrains.kotlin.resolve.calls.checkers.AssignmentChecker
import org.jetbrains.kotlin.resolve.calls.checkers.CallCheckerContext
import org.jetbrains.kotlin.resolve.calls.checkers.isAssignmentCorrectWithDataFlowInfo
import org.jetbrains.kotlin.resolve.calls.tower.isSynthesized
import org.jetbrains.kotlin.resolve.calls.util.getResolvedCall
import org.jetbrains.kotlin.resolve.calls.util.getType
import org.jetbrains.kotlin.resolve.jvm.diagnostics.ErrorsJvm
import org.jetbrains.kotlin.synthetic.SyntheticJavaPropertyDescriptor
import org.jetbrains.kotlin.types.IndexedParametersSubstitution
import org.jetbrains.kotlin.types.TypeProjection
import org.jetbrains.kotlin.types.TypeSubstitutor
import org.jetbrains.kotlin.types.Variance
import org.jetbrains.kotlin.types.typeUtil.isNothing

object JvmSyntheticAssignmentChecker : AssignmentChecker {

    private val TYPE_MISMATCH_ERRORS = setOf(Errors.TYPE_MISMATCH, Errors.CONSTANT_EXPECTED_TYPE_MISMATCH, Errors.NULL_FOR_NONNULL_TYPE)

    override fun check(assignmentExpression: KtBinaryExpression, context: CallCheckerContext) {
        val left = assignmentExpression.left ?: return
        val resolvedCall = left.getResolvedCall(context.trace.bindingContext) ?: return
        val resultingDescriptor = resolvedCall.resultingDescriptor
        if (!resultingDescriptor.isSynthesized) return
        if (resultingDescriptor !is SyntheticJavaPropertyDescriptor) return
        val receiverType = resolvedCall.extensionReceiver?.type ?: return
        val unsubstitutedReceiverType = resolvedCall.candidateDescriptor.extensionReceiverParameter?.type ?: return
        if (receiverType.constructor !== unsubstitutedReceiverType.constructor) return
        val propertyType = resolvedCall.candidateDescriptor.returnType ?: return

        val substitutionParameters = mutableListOf()
        val substitutionArguments = mutableListOf()
        for ((unsubstitutedArgument, substitutedArgument) in unsubstitutedReceiverType.arguments.zip(receiverType.arguments)) {
            val typeParameter = unsubstitutedArgument.type.constructor.declarationDescriptor as? TypeParameterDescriptor ?: continue
            substitutionParameters += typeParameter
            substitutionArguments += substitutedArgument
        }
        val substitutor = TypeSubstitutor.create(
            IndexedParametersSubstitution(
                substitutionParameters.toTypedArray(), substitutionArguments.toTypedArray(), approximateContravariantCapturedTypes = true
            )
        )
        val substitutedPropertyType = substitutor.substitute(propertyType.unwrap(), Variance.IN_VARIANCE) ?: return
        if (substitutedPropertyType.isNothing()) {
            context.trace.report(ErrorsJvm.SYNTHETIC_SETTER_PROJECTED_OUT.on(left, resultingDescriptor))
            return
        }
        val rValue = assignmentExpression.right ?: return
        val rValueType = rValue.getType(context.trace.bindingContext) ?: return
        if (isAssignmentCorrectWithDataFlowInfo(substitutedPropertyType, rValue, rValueType, context)) return
        if (context.trace.bindingContext.diagnostics.forElement(rValue).none { it.factory in TYPE_MISMATCH_ERRORS }) {
            context.trace.report(Errors.TYPE_MISMATCH_WARNING.on(rValue, substitutedPropertyType, rValueType))
        }
    }
}