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KtFirImportOptimizer.kt
585 lines (483 loc) · 24.9 KB
/
KtFirImportOptimizer.kt
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/*
* Copyright 2010-2023 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.analysis.api.fir.components
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.KtFakeSourceElementKind
import org.jetbrains.kotlin.KtRealSourceElementKind
import org.jetbrains.kotlin.analysis.api.components.KtImportOptimizer
import org.jetbrains.kotlin.analysis.api.components.KtImportOptimizerResult
import org.jetbrains.kotlin.analysis.api.fir.KtFirAnalysisSession
import org.jetbrains.kotlin.analysis.api.fir.getCandidateSymbols
import org.jetbrains.kotlin.analysis.api.fir.isImplicitDispatchReceiver
import org.jetbrains.kotlin.analysis.api.fir.references.KDocReferenceResolver
import org.jetbrains.kotlin.analysis.api.fir.utils.computeImportableName
import org.jetbrains.kotlin.analysis.api.fir.utils.firSymbol
import org.jetbrains.kotlin.analysis.api.lifetime.KtLifetimeToken
import org.jetbrains.kotlin.analysis.api.symbols.KtCallableSymbol
import org.jetbrains.kotlin.analysis.api.symbols.KtClassLikeSymbol
import org.jetbrains.kotlin.analysis.api.symbols.KtSymbol
import org.jetbrains.kotlin.analysis.api.types.KtNonErrorClassType
import org.jetbrains.kotlin.analysis.low.level.api.fir.api.LLFirResolveSession
import org.jetbrains.kotlin.analysis.low.level.api.fir.api.getOrBuildFirFile
import org.jetbrains.kotlin.fir.FirElement
import org.jetbrains.kotlin.fir.FirSession
import org.jetbrains.kotlin.fir.declarations.FirResolvePhase
import org.jetbrains.kotlin.fir.expressions.*
import org.jetbrains.kotlin.fir.psi
import org.jetbrains.kotlin.fir.realPsi
import org.jetbrains.kotlin.fir.references.FirErrorNamedReference
import org.jetbrains.kotlin.fir.resolve.diagnostics.ConeAmbiguityError
import org.jetbrains.kotlin.fir.resolve.diagnostics.ConeUnresolvedError
import org.jetbrains.kotlin.fir.resolve.diagnostics.ConeUnresolvedNameError
import org.jetbrains.kotlin.fir.resolve.diagnostics.ConeUnresolvedReferenceError
import org.jetbrains.kotlin.fir.resolve.diagnostics.ConeUnresolvedSymbolError
import org.jetbrains.kotlin.fir.resolve.diagnostics.ConeUnresolvedTypeQualifierError
import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
import org.jetbrains.kotlin.fir.symbols.impl.FirClassLikeSymbol
import org.jetbrains.kotlin.fir.symbols.lazyResolveToPhaseRecursively
import org.jetbrains.kotlin.fir.types.FirErrorTypeRef
import org.jetbrains.kotlin.fir.types.FirResolvedTypeRef
import org.jetbrains.kotlin.fir.types.classId
import org.jetbrains.kotlin.fir.types.lowerBoundIfFlexible
import org.jetbrains.kotlin.fir.visitors.FirVisitorVoid
import org.jetbrains.kotlin.kdoc.psi.impl.KDocLink
import org.jetbrains.kotlin.kdoc.psi.impl.KDocName
import org.jetbrains.kotlin.name.*
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.psi.psiUtil.getCallNameExpression
import org.jetbrains.kotlin.psi.psiUtil.getChildOfType
import org.jetbrains.kotlin.psi.psiUtil.getPossiblyQualifiedCallExpression
import org.jetbrains.kotlin.psi.psiUtil.unwrapNullability
import org.jetbrains.kotlin.resolve.calls.util.getCalleeExpressionIfAny
import org.jetbrains.kotlin.util.OperatorNameConventions
import org.jetbrains.kotlin.utils.exceptions.errorWithAttachment
import org.jetbrains.kotlin.utils.exceptions.withPsiEntry
internal class KtFirImportOptimizer(
private val analysisSession: KtFirAnalysisSession,
override val token: KtLifetimeToken,
private val firResolveSession: LLFirResolveSession
) : KtImportOptimizer() {
private val firSession: FirSession
get() = firResolveSession.useSiteFirSession
override fun analyseImports(file: KtFile): KtImportOptimizerResult {
val existingImports = file.importDirectives
if (existingImports.isEmpty()) return KtImportOptimizerResult()
val (usedDeclarations, unresolvedNames) = collectReferencedEntities(file)
return KtImportOptimizerResult(usedDeclarations, unresolvedNames)
}
override fun getImportableName(symbol: KtSymbol): FqName? = when (symbol) {
is KtClassLikeSymbol -> symbol.classIdIfNonLocal?.asSingleFqName()
is KtCallableSymbol -> symbol.firSymbol.computeImportableName(firSession)
else -> null
}
private data class ReferencedEntitiesResult(
val usedImports: Map<FqName, Set<Name>>,
val unresolvedNames: Set<Name>,
)
private fun collectReferencedEntities(file: KtFile): ReferencedEntitiesResult {
val firFile = file.getOrBuildFirFile(firResolveSession).apply { lazyResolveToPhaseRecursively(FirResolvePhase.BODY_RESOLVE) }
val usedImports = mutableMapOf<FqName, MutableSet<Name>>()
val unresolvedNames = mutableSetOf<Name>()
fun saveReferencedItem(importableName: FqName, referencedByName: Name) {
usedImports.getOrPut(importableName) { hashSetOf() } += referencedByName
}
firFile.accept(object : FirVisitorVoid() {
override fun visitElement(element: FirElement) {
element.acceptChildren(this)
}
override fun visitFunctionCall(functionCall: FirFunctionCall) {
processFunctionCall(functionCall)
super.visitFunctionCall(functionCall)
}
override fun visitImplicitInvokeCall(implicitInvokeCall: FirImplicitInvokeCall) {
processImplicitFunctionCall(implicitInvokeCall)
super.visitImplicitInvokeCall(implicitInvokeCall)
}
override fun visitComponentCall(componentCall: FirComponentCall) {
processFunctionCall(componentCall)
super.visitComponentCall(componentCall)
}
override fun visitPropertyAccessExpression(propertyAccessExpression: FirPropertyAccessExpression) {
processPropertyAccessExpression(propertyAccessExpression)
super.visitPropertyAccessExpression(propertyAccessExpression)
}
override fun visitResolvedTypeRef(resolvedTypeRef: FirResolvedTypeRef) {
processTypeRef(resolvedTypeRef)
resolvedTypeRef.delegatedTypeRef?.accept(this)
super.visitTypeRef(resolvedTypeRef)
}
override fun visitErrorTypeRef(errorTypeRef: FirErrorTypeRef) {
processTypeRef(errorTypeRef)
processErrorTypeRef(errorTypeRef)
errorTypeRef.delegatedTypeRef?.accept(this)
super.visitErrorTypeRef(errorTypeRef)
}
override fun visitCallableReferenceAccess(callableReferenceAccess: FirCallableReferenceAccess) {
processCallableReferenceAccess(callableReferenceAccess)
super.visitCallableReferenceAccess(callableReferenceAccess)
}
override fun visitResolvedQualifier(resolvedQualifier: FirResolvedQualifier) {
processResolvedQualifier(resolvedQualifier)
super.visitResolvedQualifier(resolvedQualifier)
}
override fun visitErrorResolvedQualifier(errorResolvedQualifier: FirErrorResolvedQualifier) {
processResolvedQualifier(errorResolvedQualifier)
super.visitErrorResolvedQualifier(errorResolvedQualifier)
}
private fun processErrorNameReference(resolvable: FirResolvable) {
val nameReference = resolvable.calleeReference as? FirErrorNamedReference ?: return
val name = nameReference.unresolvedName ?: return
unresolvedNames += name
}
private fun processErrorTypeRef(typeRef: FirErrorTypeRef) {
val diagnostic = typeRef.diagnostic as? ConeUnresolvedError ?: return
val name = diagnostic.unresolvedName ?: return
unresolvedNames += name
}
private fun processFunctionCall(functionCall: FirFunctionCall) {
if (functionCall.dispatchedWithoutImport) return
processErrorNameReference(functionCall)
val referencesByName = functionCall.functionReferenceName ?: return
saveCallable(functionCall, referencesByName)
}
private fun processImplicitFunctionCall(implicitInvokeCall: FirImplicitInvokeCall) {
processErrorNameReference(implicitInvokeCall)
saveCallable(implicitInvokeCall, OperatorNameConventions.INVOKE)
}
private fun processPropertyAccessExpression(propertyAccessExpression: FirPropertyAccessExpression) {
if (propertyAccessExpression.dispatchedWithoutImport) return
processErrorNameReference(propertyAccessExpression)
val referencedByName = propertyAccessExpression.propertyReferenceName ?: return
saveCallable(propertyAccessExpression, referencedByName)
}
private fun processTypeRef(resolvedTypeRef: FirResolvedTypeRef) {
val wholeQualifier = TypeQualifier.createFor(resolvedTypeRef) ?: return
processTypeQualifier(wholeQualifier)
}
private fun processCallableReferenceAccess(callableReferenceAccess: FirCallableReferenceAccess) {
if (callableReferenceAccess.dispatchedWithoutImport) return
processErrorNameReference(callableReferenceAccess)
val referencedByName = callableReferenceAccess.callableReferenceName ?: return
saveCallable(callableReferenceAccess, referencedByName)
}
private fun processResolvedQualifier(resolvedQualifier: FirResolvedQualifier) {
val wholeQualifier = TypeQualifier.createFor(resolvedQualifier) ?: return
processTypeQualifier(wholeQualifier)
}
private fun processTypeQualifier(qualifier: TypeQualifier) {
val mostOuterTypeQualifier = generateSequence(qualifier) { it.outerTypeQualifier }.last()
if (mostOuterTypeQualifier.isQualified) return
saveType(mostOuterTypeQualifier)
}
private fun saveType(qualifier: TypeQualifier) {
val importableName = qualifier.referencedClassId.asSingleFqName()
val referencedByName = qualifier.referencedByName
saveReferencedItem(importableName, referencedByName)
}
private fun saveCallable(qualifiedCall: FirQualifiedAccessExpression, referencedByName: Name) {
val importableName = importableNameForReferencedSymbol(qualifiedCall) ?: return
saveReferencedItem(importableName, referencedByName)
}
private fun importableNameForReferencedSymbol(qualifiedCall: FirQualifiedAccessExpression): FqName? {
return qualifiedCall.importableNameForImplicitlyDispatchedCallable()
?: qualifiedCall.referencedCallableSymbol?.computeImportableName(firSession)
}
/**
* Returns correct importable name for implicitly dispatched callable - that is, a callable
* which has a dispatch receiver, but whose dispatch receiver is present implicitly. The most
* important case for that is the following:
*
* ```kt
* import MyObject.bar
*
* open class Base { fun bar() {} }
*
* object MyObject : Base()
*
* fun test() {
* bar()
* }
* ```
*
* For the `bar()` call, `MyObject` instance is an implicit dispatch receiver.
*
* In such case, [FirQualifiedAccessExpression] representing the call references
* the original `Base.bar` callable symbol instead of `MyObject.bar`, because there are
* no separate symbol for that case.
*
* Java statics present a similar case - they can be imported not only from the declaring class,
* but also from any subclass.
*/
private fun FirQualifiedAccessExpression.importableNameForImplicitlyDispatchedCallable(): FqName? {
val dispatchReceiver = dispatchReceiver
if (
dispatchReceiver !is FirResolvedQualifier ||
!dispatchReceiver.isImplicitDispatchReceiver
) {
return null
}
val dispatcherClass = dispatchReceiver.classId ?: return null
val referencedSymbolName = referencedCallableSymbol?.name ?: return null
return CallableId(dispatcherClass, referencedSymbolName).asSingleFqName()
}
})
file.accept(object : KtTreeVisitorVoid() {
override fun visitElement(element: PsiElement) {
super.visitElement(element)
if (element is KDocLink) {
visitKDocLink(element)
}
}
private fun visitKDocLink(docLink: KDocLink) {
val docName = docLink.getChildOfType<KDocName>() ?: return
val qualifiedNameAsFqName = docName.getQualifiedNameAsFqName()
val importableNames = with(analysisSession) {
val resolvedSymbols = KDocReferenceResolver
.resolveKdocFqName(analysisSession, qualifiedNameAsFqName, qualifiedNameAsFqName, docLink)
if (resolvedSymbols.isEmpty()) {
unresolvedNames += qualifiedNameAsFqName.shortName()
emptyList()
} else {
resolvedSymbols.flatMap { toImportableFqNames(it, qualifiedNameAsFqName) }
}
}
importableNames.forEach { importableName ->
saveReferencedItem(importableName, importableName.shortName())
}
}
private fun toImportableFqNames(symbol: KtSymbol, qualifiedNameAsFqName: FqName): List<FqName> =
buildList {
when (symbol) {
is KtCallableSymbol -> {
val callableId = symbol.callableIdIfNonLocal ?: return emptyList()
val fqName = callableId.asSingleFqName()
val classFqName = callableId.classId?.asSingleFqName()
// either it is a member declaration
if (classFqName != null) {
if (classFqName != qualifiedNameAsFqName) {
this += classFqName
}
} else if (fqName != qualifiedNameAsFqName) {
// or some kind of top level declaration with potential receiver
this += fqName
val receiverClassType = symbol.receiverParameter?.type as? KtNonErrorClassType
val receiverFqName = receiverClassType?.classId?.asSingleFqName()
// import has no receiver for receiver kdoc declaration:
// for receiver case kdoc like `[Foo.bar]`
// import looks like `import a.b.bar`
if (receiverFqName != null && qualifiedNameAsFqName.pathSegments().size > 1) {
this += receiverFqName
}
}
}
is KtClassLikeSymbol -> {
val fqName = symbol.classIdIfNonLocal?.asSingleFqName()
if (fqName != null && fqName != qualifiedNameAsFqName) {
this += fqName
}
}
}
}
})
return ReferencedEntitiesResult(usedImports, unresolvedNames)
}
}
private val FirErrorNamedReference.unresolvedName: Name?
get() = when (val diagnostic = diagnostic) {
is ConeUnresolvedError -> diagnostic.unresolvedName
is ConeAmbiguityError -> diagnostic.name
else -> null
}
private val ConeUnresolvedError.unresolvedName: Name?
get() = when (this) {
is ConeUnresolvedNameError -> name
is ConeUnresolvedReferenceError -> name
is ConeUnresolvedSymbolError -> classId.shortClassName
is ConeUnresolvedTypeQualifierError -> {
// we take the first qualifier part because only the first one can be imported
qualifiers.firstOrNull()?.name
}
}
/**
* An actual name by which this callable reference was used.
*/
private val FirCallableReferenceAccess.callableReferenceName: Name?
get() {
toResolvedCallableReference()?.let { return it.name }
val wholeCallableReferenceExpression = realPsi as? KtCallableReferenceExpression
return wholeCallableReferenceExpression?.callableReference?.getReferencedNameAsName()
}
/**
* A name by which referenced functions was called.
*/
private val FirFunctionCall.functionReferenceName: Name?
get() {
toResolvedCallableReference()?.let { return it.name }
// unresolved reference has incorrect name, so we have to retrieve it by PSI
val wholeCallExpression = realPsi as? KtExpression
val callExpression = wholeCallExpression?.getPossiblyQualifiedCallExpression()
return callExpression?.getCallNameExpression()?.getReferencedNameAsName()
}
/**
* A name by which referenced property is used.
*/
private val FirPropertyAccessExpression.propertyReferenceName: Name?
get() {
toResolvedCallableReference()?.let { return it.name }
// unresolved reference has incorrect name, so we have to retrieve it by PSI
val wholePropertyAccessExpression = realPsi as? KtExpression
val propertyNameExpression = wholePropertyAccessExpression?.getPossiblyQualifiedSimpleNameExpression()
return propertyNameExpression?.getReferencedNameAsName()
}
/**
* Referenced callable symbol, even if it not completely correctly resolved.
*/
private val FirQualifiedAccessExpression.referencedCallableSymbol: FirCallableSymbol<*>?
get() {
return toResolvedCallableSymbol()
}
/**
* Referenced [ClassId], even if it is not completely correctly resolved.
*/
private val FirResolvedTypeRef.resolvedClassId: ClassId?
get() {
if (this !is FirErrorTypeRef) {
// When you call a method from Java with type arguments, in FIR they are currently represented as flexible types.
// TODO Consider handling other non-ConeLookupTagBasedType types here (see KT-66418)
return type.lowerBoundIfFlexible().classId
}
val candidateSymbols = diagnostic.getCandidateSymbols()
val singleClassSymbol = candidateSymbols.singleOrNull() as? FirClassLikeSymbol
return singleClassSymbol?.classId
}
private val FirQualifiedAccessExpression.dispatchedWithoutImport: Boolean
get() = when {
isQualifiedWithPackage -> true
dispatchReceiver is FirThisReceiverExpression -> true
explicitReceiver != null && dispatchReceiver == explicitReceiver -> true
else -> false
}
/**
* Returns `true` if [this] expression is fully-qualified with package name.
* Such expressions definitely do not need any kind of imports.
*
* Examples:
* - `pkg.foo()` - `true`
* - `foo()` - `false`
* - `Obj.foo()` - `false`
* - `pkg.Obj.foo()` - `false`
*/
private val FirQualifiedAccessExpression.isQualifiedWithPackage: Boolean
get() {
val receiver = explicitReceiver
return receiver is FirResolvedQualifier && receiver.relativeClassFqName == null
}
private fun KtExpression.getPossiblyQualifiedSimpleNameExpression(): KtSimpleNameExpression? {
return ((this as? KtQualifiedExpression)?.selectorExpression ?: this) as? KtSimpleNameExpression?
}
/**
* Helper abstraction to navigate through qualified FIR elements - we have to match [ClassId] and PSI qualifier pair
* to correctly reason about long qualifiers.
*/
private sealed interface TypeQualifier {
val referencedClassId: ClassId
/**
* Type can be imported with alias, and thus can be referenced by the name different from its actual name.
*
* We cannot use [ClassId.getShortClassName] for this, since it is not affected by the alias.
*/
val referencedByName: Name
/**
* Must be `true` if the PSI qualifier is itself qualified with the package or some other type, and `false` otherwise.
*
* ```
* foo.bar.Baz -> true
* Baz.Type -> true
* Baz -> false
* ```
*/
val isQualified: Boolean
val outerTypeQualifier: TypeQualifier?
private class KtDotExpressionTypeQualifier(
override val referencedClassId: ClassId,
qualifier: KtElement,
) : TypeQualifier {
private val dotQualifier: KtDotQualifiedExpression? = qualifier as? KtDotQualifiedExpression
private val typeNameReference: KtNameReferenceExpression = run {
require(qualifier is KtNameReferenceExpression || qualifier is KtDotQualifiedExpression || qualifier is KtCallExpression) {
"Unexpected qualifier '${qualifier.text}' of type '${qualifier::class}'"
}
qualifier.getCalleeExpressionIfAny() as? KtNameReferenceExpression
?: errorWithAttachment("Cannot get referenced name from '${qualifier::class}'") {
withPsiEntry("qualifier", qualifier)
}
}
override val referencedByName: Name
get() = typeNameReference.getReferencedNameAsName()
override val isQualified: Boolean
get() = dotQualifier != null
override val outerTypeQualifier: TypeQualifier?
get() {
val outerClassId = referencedClassId.outerClassId ?: return null
val outerQualifier = dotQualifier?.receiverExpression ?: return null
return KtDotExpressionTypeQualifier(outerClassId, outerQualifier)
}
}
private class KtUserTypeQualifier(
override val referencedClassId: ClassId,
private val qualifier: KtUserType,
) : TypeQualifier {
override val referencedByName: Name
get() = qualifier.referenceExpression?.getReferencedNameAsName()
?: errorWithAttachment("Cannot get referenced name from '${qualifier::class}'") {
withPsiEntry("qualifier", qualifier)
}
override val isQualified: Boolean
get() = qualifier.qualifier != null
override val outerTypeQualifier: TypeQualifier?
get() {
val outerClassId = referencedClassId.outerClassId ?: return null
val outerQualifier = qualifier.qualifier ?: return null
return KtUserTypeQualifier(outerClassId, outerQualifier)
}
}
companion object {
val FirResolvedQualifier.isPresentInSource: Boolean
get() = when (source?.kind) {
is KtRealSourceElementKind -> true
is KtFakeSourceElementKind.ImplicitInvokeCall -> true
else -> false
}
fun createFor(qualifier: FirResolvedQualifier): TypeQualifier? {
if (!qualifier.isPresentInSource) return null
val wholeClassId = qualifier.classId ?: return null
val psi = qualifier.psi as? KtExpression ?: return null
val wholeQualifier = when (psi) {
is KtDotQualifiedExpression -> psi
is KtNameReferenceExpression -> psi.getDotQualifiedExpressionForSelector() ?: psi
else -> psi
}
return KtDotExpressionTypeQualifier(wholeClassId, wholeQualifier)
}
private val FirResolvedTypeRef.isPresentInSource: Boolean
get() = when (source?.kind) {
is KtRealSourceElementKind -> {
val isArrayFromVararg = delegatedTypeRef?.source?.kind is KtFakeSourceElementKind.ArrayTypeFromVarargParameter;
// type ref with delegated type ref with such source kind is NOT directly present in the source, so we ignore it
!isArrayFromVararg
}
// type ref with such source kind is explicitly present in the source, so we want to see it
is KtFakeSourceElementKind.ArrayTypeFromVarargParameter -> true
else -> false
}
fun createFor(typeRef: FirResolvedTypeRef): TypeQualifier? {
if (!typeRef.isPresentInSource) return null
val wholeClassId = typeRef.resolvedClassId ?: return null
val psi = typeRef.psi as? KtTypeReference ?: return null
val wholeUserType = psi.typeElement?.unwrapNullability() as? KtUserType ?: return null
return KtUserTypeQualifier(wholeClassId, wholeUserType)
}
}
}