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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.types
import org.jetbrains.kotlin.types.AbstractTypeCheckerContext.LowerCapturedTypePolicy.*
import org.jetbrains.kotlin.types.AbstractTypeCheckerContext.SupertypesPolicy
import org.jetbrains.kotlin.types.model.*
import org.jetbrains.kotlin.utils.SmartList
import org.jetbrains.kotlin.utils.SmartSet
import java.util.*
abstract class AbstractTypeCheckerContext : TypeSystemContext {
abstract fun substitutionSupertypePolicy(type: SimpleTypeMarker): SupertypesPolicy
abstract fun areEqualTypeConstructors(a: TypeConstructorMarker, b: TypeConstructorMarker): Boolean
override fun prepareType(type: KotlinTypeMarker): KotlinTypeMarker {
return type
}
open fun refineType(type: KotlinTypeMarker): KotlinTypeMarker {
return type
}
open fun customIsSubtypeOf(subType: KotlinTypeMarker, superType: KotlinTypeMarker): Boolean = true
abstract val isErrorTypeEqualsToAnything: Boolean
abstract val isStubTypeEqualsToAnything: Boolean
protected var argumentsDepth = 0
internal inline fun runWithArgumentsSettings(subArgument: KotlinTypeMarker, f: AbstractTypeCheckerContext.() -> T): T {
if (argumentsDepth > 100) {
error("Arguments depth is too high. Some related argument: $subArgument")
}
argumentsDepth++
val result = f()
argumentsDepth--
return result
}
open fun getLowerCapturedTypePolicy(subType: SimpleTypeMarker, superType: CapturedTypeMarker): LowerCapturedTypePolicy = CHECK_SUBTYPE_AND_LOWER
open fun addSubtypeConstraint(
subType: KotlinTypeMarker,
superType: KotlinTypeMarker,
isFromNullabilityConstraint: Boolean = false
): Boolean? = null
enum class LowerCapturedTypePolicy {
CHECK_ONLY_LOWER,
CHECK_SUBTYPE_AND_LOWER,
SKIP_LOWER
}
private var supertypesLocked = false
var supertypesDeque: ArrayDeque? = null
private set
var supertypesSet: MutableSet? = null
private set
fun initialize() {
assert(!supertypesLocked)
supertypesLocked = true
if (supertypesDeque == null) {
supertypesDeque = ArrayDeque(4)
}
if (supertypesSet == null) {
supertypesSet = SmartSet.create()
}
}
fun clear() {
supertypesDeque!!.clear()
supertypesSet!!.clear()
supertypesLocked = false
}
inline fun anySupertype(
start: SimpleTypeMarker,
predicate: (SimpleTypeMarker) -> Boolean,
supertypesPolicy: (SimpleTypeMarker) -> SupertypesPolicy
): Boolean {
if (predicate(start)) return true
initialize()
val deque = supertypesDeque!!
val visitedSupertypes = supertypesSet!!
deque.push(start)
while (deque.isNotEmpty()) {
if (visitedSupertypes.size > 1000) {
error("Too many supertypes for type: $start. Supertypes = ${visitedSupertypes.joinToString()}")
}
val current = deque.pop()
if (!visitedSupertypes.add(current)) continue
val policy = supertypesPolicy(current).takeIf { it != SupertypesPolicy.None } ?: continue
for (supertype in current.typeConstructor().supertypes()) {
val newType = policy.transformType(this, supertype)
if (predicate(newType)) {
clear()
return true
}
deque.add(newType)
}
}
clear()
return false
}
sealed class SupertypesPolicy {
abstract fun transformType(context: AbstractTypeCheckerContext, type: KotlinTypeMarker): SimpleTypeMarker
object None : SupertypesPolicy() {
override fun transformType(context: AbstractTypeCheckerContext, type: KotlinTypeMarker) =
throw UnsupportedOperationException("Should not be called")
}
object UpperIfFlexible : SupertypesPolicy() {
override fun transformType(context: AbstractTypeCheckerContext, type: KotlinTypeMarker) =
with(context) { type.upperBoundIfFlexible() }
}
object LowerIfFlexible : SupertypesPolicy() {
override fun transformType(context: AbstractTypeCheckerContext, type: KotlinTypeMarker) =
with(context) { type.lowerBoundIfFlexible() }
}
abstract class DoCustomTransform : SupertypesPolicy()
}
abstract val KotlinTypeMarker.isAllowedTypeVariable: Boolean
}
object AbstractTypeChecker {
@JvmField
var RUN_SLOW_ASSERTIONS = false
fun isSubtypeOf(
context: TypeCheckerProviderContext,
subType: KotlinTypeMarker,
superType: KotlinTypeMarker,
stubTypesEqualToAnything: Boolean = true
): Boolean {
return AbstractTypeChecker.isSubtypeOf(context.newBaseTypeCheckerContext(true, stubTypesEqualToAnything), subType, superType)
}
fun isSubtypeOfClass(
context: AbstractTypeCheckerContext,
typeConstructor: TypeConstructorMarker,
superConstructor: TypeConstructorMarker
): Boolean {
if (typeConstructor == superConstructor) return true
with(context) {
for (superType in typeConstructor.supertypes()) {
if (isSubtypeOfClass(context, superType.typeConstructor(), superConstructor)) {
return true
}
}
}
return false
}
fun equalTypes(
context: TypeCheckerProviderContext,
a: KotlinTypeMarker,
b: KotlinTypeMarker,
stubTypesEqualToAnything: Boolean = true
): Boolean {
return AbstractTypeChecker.equalTypes(context.newBaseTypeCheckerContext(false, stubTypesEqualToAnything), a, b)
}
fun isSubtypeOf(
context: AbstractTypeCheckerContext,
subType: KotlinTypeMarker,
superType: KotlinTypeMarker,
isFromNullabilityConstraint: Boolean = false
): Boolean {
if (subType === superType) return true
if (!context.customIsSubtypeOf(subType, superType)) return false
return with(context) {
completeIsSubTypeOf(prepareType(refineType(subType)), prepareType(refineType(superType)), isFromNullabilityConstraint)
}
}
fun equalTypes(context: AbstractTypeCheckerContext, a: KotlinTypeMarker, b: KotlinTypeMarker): Boolean = with(context) {
if (a === b) return true
if (isCommonDenotableType(a) && isCommonDenotableType(b)) {
val refinedA = refineType(a)
val refinedB = refineType(b)
val simpleA = refinedA.lowerBoundIfFlexible()
if (!areEqualTypeConstructors(refinedA.typeConstructor(), refinedB.typeConstructor())) return false
if (simpleA.argumentsCount() == 0) {
if (refinedA.hasFlexibleNullability() || refinedB.hasFlexibleNullability()) return true
return simpleA.isMarkedNullable() == refinedB.lowerBoundIfFlexible().isMarkedNullable()
}
}
return isSubtypeOf(context, a, b) && isSubtypeOf(context, b, a)
}
private fun AbstractTypeCheckerContext.completeIsSubTypeOf(
subType: KotlinTypeMarker,
superType: KotlinTypeMarker,
isFromNullabilityConstraint: Boolean
): Boolean {
checkSubtypeForSpecialCases(subType.lowerBoundIfFlexible(), superType.upperBoundIfFlexible())?.let {
addSubtypeConstraint(subType, superType, isFromNullabilityConstraint)
return it
}
// we should add constraints with flexible types, otherwise we never get flexible type as answer in constraint system
addSubtypeConstraint(subType, superType, isFromNullabilityConstraint)?.let { return it }
return isSubtypeOfForSingleClassifierType(subType.lowerBoundIfFlexible(), superType.upperBoundIfFlexible())
}
private fun AbstractTypeCheckerContext.checkSubtypeForIntegerLiteralType(
subType: SimpleTypeMarker,
superType: SimpleTypeMarker
): Boolean? {
if (!subType.isIntegerLiteralType() && !superType.isIntegerLiteralType()) return null
fun isTypeInIntegerLiteralType(integerLiteralType: SimpleTypeMarker, type: SimpleTypeMarker, checkSupertypes: Boolean): Boolean =
integerLiteralType.possibleIntegerTypes().any { possibleType ->
(possibleType.typeConstructor() == type.typeConstructor()) || (checkSupertypes && isSubtypeOf(this, type, possibleType))
}
fun isIntegerLiteralTypeInIntersectionComponents(type: SimpleTypeMarker): Boolean {
val typeConstructor = type.typeConstructor()
return typeConstructor is IntersectionTypeConstructorMarker
&& typeConstructor.supertypes().any { it.asSimpleType()?.isIntegerLiteralType() == true }
}
when {
subType.isIntegerLiteralType() && superType.isIntegerLiteralType() -> {
return true
}
subType.isIntegerLiteralType() -> {
if (isTypeInIntegerLiteralType(subType, superType, checkSupertypes = false)) {
return true
}
}
superType.isIntegerLiteralType() -> {
// Here we also have to check supertypes for intersection types: { Int & String } <: IntegerLiteralTypes
if (isIntegerLiteralTypeInIntersectionComponents(subType)
|| isTypeInIntegerLiteralType(superType, subType, checkSupertypes = true)
) {
return true
}
}
}
return null
}
private fun AbstractTypeCheckerContext.hasNothingSupertype(type: SimpleTypeMarker): Boolean {
val typeConstructor = type.typeConstructor()
if (typeConstructor.isClassTypeConstructor()) {
return typeConstructor.isNothingConstructor()
}
return anySupertype(type, { it.typeConstructor().isNothingConstructor() }) {
if (it.isClassType()) {
SupertypesPolicy.None
} else {
SupertypesPolicy.LowerIfFlexible
}
}
}
private fun AbstractTypeCheckerContext.isSubtypeOfForSingleClassifierType(subType: SimpleTypeMarker, superType: SimpleTypeMarker): Boolean {
if (AbstractTypeChecker.RUN_SLOW_ASSERTIONS) {
assert(subType.isSingleClassifierType() || subType.typeConstructor().isIntersection() || subType.isAllowedTypeVariable) {
"Not singleClassifierType and not intersection subType: $subType"
}
assert(superType.isSingleClassifierType() || superType.isAllowedTypeVariable) {
"Not singleClassifierType superType: $superType"
}
}
if (!AbstractNullabilityChecker.isPossibleSubtype(this, subType, superType)) return false
checkSubtypeForIntegerLiteralType(subType.lowerBoundIfFlexible(), superType.upperBoundIfFlexible())?.let {
addSubtypeConstraint(subType, superType)
return it
}
val superConstructor = superType.typeConstructor()
if (isEqualTypeConstructors(subType.typeConstructor(), superConstructor) && superConstructor.parametersCount() == 0) return true
if (superType.typeConstructor().isAnyConstructor()) return true
val supertypesWithSameConstructor = findCorrespondingSupertypes(subType, superConstructor)
when (supertypesWithSameConstructor.size) {
0 -> return hasNothingSupertype(subType) // todo Nothing & Array <: Array
1 -> return isSubtypeForSameConstructor(supertypesWithSameConstructor.first().asArgumentList(), superType)
else -> { // at least 2 supertypes with same constructors. Such case is rare
val newArguments = ArgumentList(superConstructor.parametersCount())
var anyNonOutParameter = false
for (index in 0 until superConstructor.parametersCount()) {
anyNonOutParameter = anyNonOutParameter || superConstructor.getParameter(index).getVariance() != TypeVariance.OUT
if (anyNonOutParameter) continue
val allProjections = supertypesWithSameConstructor.map {
it.getArgumentOrNull(index)?.takeIf { it.getVariance() == TypeVariance.INV }?.getType()
?: error("Incorrect type: $it, subType: $subType, superType: $superType")
}
// todo discuss
val intersection = intersectTypes(allProjections).asTypeArgument()
newArguments.add(intersection)
}
if (!anyNonOutParameter && isSubtypeForSameConstructor(newArguments, superType)) return true
// TODO: rethink this; now components order in intersection type affects semantic due to run subtyping (which can add constraints) only until the first successful candidate
return supertypesWithSameConstructor.any { isSubtypeForSameConstructor(it.asArgumentList(), superType) }
}
}
}
fun AbstractTypeCheckerContext.isSubtypeForSameConstructor(
capturedSubArguments: TypeArgumentListMarker,
superType: SimpleTypeMarker
): Boolean {
// No way to check, as no index sometimes
//if (capturedSubArguments === superType.arguments) return true
//val parameters = superType.constructor.parameters
val superTypeConstructor = superType.typeConstructor()
for (index in 0 until superTypeConstructor.parametersCount()) {
val superProjection = superType.getArgument(index) // todo error index
if (superProjection.isStarProjection()) continue // A <: A<*>
val superArgumentType = superProjection.getType()
val subArgumentType = capturedSubArguments[index].let {
assert(it.getVariance() == TypeVariance.INV) { "Incorrect sub argument: $it" }
it.getType()
}
val variance = effectiveVariance(superTypeConstructor.getParameter(index).getVariance(), superProjection.getVariance())
?: return isErrorTypeEqualsToAnything // todo exception?
val correctArgument = runWithArgumentsSettings(subArgumentType) {
when (variance) {
TypeVariance.INV -> equalTypes(this, subArgumentType, superArgumentType)
TypeVariance.OUT -> isSubtypeOf(this, subArgumentType, superArgumentType)
TypeVariance.IN -> isSubtypeOf(this, superArgumentType, subArgumentType)
}
}
if (!correctArgument) return false
}
return true
}
private fun AbstractTypeCheckerContext.isCommonDenotableType(type: KotlinTypeMarker): Boolean =
type.typeConstructor().isDenotable() &&
!type.isDynamic() && !type.isDefinitelyNotNullType() &&
type.lowerBoundIfFlexible().typeConstructor() == type.upperBoundIfFlexible().typeConstructor()
fun effectiveVariance(declared: TypeVariance, useSite: TypeVariance): TypeVariance? {
if (declared == TypeVariance.INV) return useSite
if (useSite == TypeVariance.INV) return declared
// both not INVARIANT
if (declared == useSite) return declared
// composite In with Out
return null
}
private fun AbstractTypeCheckerContext.checkSubtypeForSpecialCases(subType: SimpleTypeMarker, superType: SimpleTypeMarker): Boolean? {
if (subType.isError() || superType.isError()) {
if (isErrorTypeEqualsToAnything) return true
if (subType.isMarkedNullable() && !superType.isMarkedNullable()) return false
return AbstractStrictEqualityTypeChecker.strictEqualTypes(
this,
subType.withNullability(false),
superType.withNullability(false)
)
}
if (subType.isStubType() || superType.isStubType()) return isStubTypeEqualsToAnything
val superTypeCaptured = superType.asCapturedType()
val lowerType = superTypeCaptured?.lowerType()
if (superTypeCaptured != null && lowerType != null) {
when (getLowerCapturedTypePolicy(subType, superTypeCaptured)) {
CHECK_ONLY_LOWER -> return isSubtypeOf(this, subType, lowerType)
CHECK_SUBTYPE_AND_LOWER -> if (isSubtypeOf(this, subType, lowerType)) return true
SKIP_LOWER -> Unit
}
}
val superTypeConstructor = superType.typeConstructor()
if (superTypeConstructor.isIntersection()) {
assert(!superType.isMarkedNullable()) { "Intersection type should not be marked nullable!: $superType" }
return superTypeConstructor.supertypes().all { isSubtypeOf(this, subType, it) }
}
return null
}
private fun AbstractTypeCheckerContext.collectAllSupertypesWithGivenTypeConstructor(
subType: SimpleTypeMarker,
superConstructor: TypeConstructorMarker
): List {
subType.fastCorrespondingSupertypes(superConstructor)?.let {
return it
}
if (!superConstructor.isClassTypeConstructor() && subType.isClassType()) return emptyList()
if (superConstructor.isCommonFinalClassConstructor()) {
return if (areEqualTypeConstructors(subType.typeConstructor(), superConstructor))
listOf(captureFromArguments(subType, CaptureStatus.FOR_SUBTYPING) ?: subType)
else
emptyList()
}
val result: MutableList = SmartList()
anySupertype(subType, { false }) {
val current = captureFromArguments(it, CaptureStatus.FOR_SUBTYPING) ?: it
when {
areEqualTypeConstructors(current.typeConstructor(), superConstructor) -> {
result.add(current)
SupertypesPolicy.None
}
current.argumentsCount() == 0 -> {
SupertypesPolicy.LowerIfFlexible
}
else -> {
substitutionSupertypePolicy(current)
}
}
}
return result
}
private fun AbstractTypeCheckerContext.collectAndFilter(classType: SimpleTypeMarker, constructor: TypeConstructorMarker) =
selectOnlyPureKotlinSupertypes(collectAllSupertypesWithGivenTypeConstructor(classType, constructor))
/**
* If we have several paths to some interface, we should prefer pure kotlin path.
* Example:
*
* class MyList : AbstractList(), MutableList
*
* We should see `String` in `get` function and others, also MyList is not subtype of MutableList
*
* More tests: javaAndKotlinSuperType & purelyImplementedCollection folder
*/
private fun AbstractTypeCheckerContext.selectOnlyPureKotlinSupertypes(supertypes: List): List {
if (supertypes.size < 2) return supertypes
val allPureSupertypes = supertypes.filter {
it.asArgumentList().all(this) { it.getType().asFlexibleType() == null }
}
return if (allPureSupertypes.isNotEmpty()) allPureSupertypes else supertypes
}
// nullability was checked earlier via nullabilityChecker
// should be used only if you really sure that it is correct
fun AbstractTypeCheckerContext.findCorrespondingSupertypes(
subType: SimpleTypeMarker,
superConstructor: TypeConstructorMarker
): List {
if (subType.isClassType()) {
return collectAndFilter(subType, superConstructor)
}
// i.e. superType is not a classType
if (!superConstructor.isClassTypeConstructor() && !superConstructor.isIntegerLiteralTypeConstructor()) {
return collectAllSupertypesWithGivenTypeConstructor(subType, superConstructor)
}
// todo add tests
val classTypeSupertypes = SmartList()
anySupertype(subType, { false }) {
if (it.isClassType()) {
classTypeSupertypes.add(it)
SupertypesPolicy.None
} else {
SupertypesPolicy.LowerIfFlexible
}
}
return classTypeSupertypes.flatMap { collectAndFilter(it, superConstructor) }
}
}
object AbstractNullabilityChecker {
// this method checks only nullability
fun isPossibleSubtype(context: AbstractTypeCheckerContext, subType: SimpleTypeMarker, superType: SimpleTypeMarker): Boolean =
context.runIsPossibleSubtype(subType, superType)
fun isSubtypeOfAny(context: TypeCheckerProviderContext, type: KotlinTypeMarker): Boolean =
AbstractNullabilityChecker.isSubtypeOfAny(
context.newBaseTypeCheckerContext(
errorTypesEqualToAnything = false,
stubTypesEqualToAnything = true
),
type
)
fun isSubtypeOfAny(context: AbstractTypeCheckerContext, type: KotlinTypeMarker): Boolean =
with(context) {
hasNotNullSupertype(type.lowerBoundIfFlexible(), SupertypesPolicy.LowerIfFlexible)
}
private fun AbstractTypeCheckerContext.runIsPossibleSubtype(subType: SimpleTypeMarker, superType: SimpleTypeMarker): Boolean {
if (AbstractTypeChecker.RUN_SLOW_ASSERTIONS) {
// it makes for case String? & Any <: String
assert(subType.isSingleClassifierType() || subType.typeConstructor().isIntersection() || subType.isAllowedTypeVariable) {
"Not singleClassifierType and not intersection subType: $subType"
}
assert(superType.isSingleClassifierType() || superType.isAllowedTypeVariable) {
"Not singleClassifierType superType: $superType"
}
}
// superType is actually nullable
if (superType.isMarkedNullable()) return true
// i.e. subType is definitely not null
if (subType.isDefinitelyNotNullType()) return true
// i.e. subType is captured type, projection of which is marked not-null
if (subType is CapturedTypeMarker && subType.isProjectionNotNull()) return true
// i.e. subType is not-nullable
if (hasNotNullSupertype(subType, SupertypesPolicy.LowerIfFlexible)) return true
// i.e. subType hasn't not-null supertype and isn't definitely not-null, but superType is definitely not-null
if (superType.isDefinitelyNotNullType()) return false
// i.e subType hasn't not-null supertype, but superType has
if (hasNotNullSupertype(superType, SupertypesPolicy.UpperIfFlexible)) return false
// both superType and subType hasn't not-null supertype and are not definitely not null.
/**
* If we still don't know, it means, that superType is not classType, for example -- type parameter.
*
* For captured types with lower bound this function can give to you false result. Example:
* class A, A => \exist Q : Number <: Q. A
* isPossibleSubtype(Number, Q) = false.
* Such cases should be taken in to account in [NewKotlinTypeChecker.isSubtypeOf] (same for intersection types)
*/
// classType cannot has special type in supertype list
if (subType.isClassType()) return false
return hasPathByNotMarkedNullableNodes(subType, superType.typeConstructor())
}
fun AbstractTypeCheckerContext.hasNotNullSupertype(type: SimpleTypeMarker, supertypesPolicy: SupertypesPolicy) =
anySupertype(type, {
(it.isClassType() && !it.isMarkedNullable()) || it.isDefinitelyNotNullType()
}) {
if (it.isMarkedNullable()) SupertypesPolicy.None else supertypesPolicy
}
fun TypeCheckerProviderContext.hasPathByNotMarkedNullableNodes(start: SimpleTypeMarker, end: TypeConstructorMarker) =
newBaseTypeCheckerContext(errorTypesEqualToAnything = false, stubTypesEqualToAnything = true)
.hasPathByNotMarkedNullableNodes(start, end)
fun AbstractTypeCheckerContext.hasPathByNotMarkedNullableNodes(start: SimpleTypeMarker, end: TypeConstructorMarker) =
anySupertype(
start,
{ isApplicableAsEndNode(it, end) },
{ if (it.isMarkedNullable()) SupertypesPolicy.None else SupertypesPolicy.LowerIfFlexible }
)
private fun AbstractTypeCheckerContext.isApplicableAsEndNode(type: SimpleTypeMarker, end: TypeConstructorMarker): Boolean {
if (type.isNothing()) return true
if (type.isMarkedNullable()) return false
if (isStubTypeEqualsToAnything && type.isStubType()) return true
return isEqualTypeConstructors(type.typeConstructor(), end)
}
}
object AbstractFlexibilityChecker {
fun TypeSystemCommonSuperTypesContext.hasDifferentFlexibilityAtDepth(types: Collection): Boolean {
if (types.isEmpty()) return false
if (hasDifferentFlexibility(types)) return true
for (i in 0 until types.first().argumentsCount()) {
val typeArgumentForOtherTypes = types.mapNotNull {
if (it.argumentsCount() > i && !it.getArgument(i).isStarProjection()) it.getArgument(i).getType() else null
}
if (hasDifferentFlexibilityAtDepth(typeArgumentForOtherTypes)) return true
}
return false
}
private fun TypeSystemCommonSuperTypesContext.hasDifferentFlexibility(types: Collection): Boolean {
val firstType = types.first()
if (types.all { it === firstType }) return false
return !types.all { it.isFlexible() } && !types.all { !it.isFlexible() }
}
}
