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Decouple TypeCheckerContext and TypeSystemContext

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This commit is contained in:
Simon Ogorodnik
2021-02-04 05:14:29 +03:00
committed by TeamCityServer
parent 53a7dc1126
commit 3909e3c54c
32 changed files with 483 additions and 416 deletions
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core/compiler.common/src/org/jetbrains/kotlin/types/AbstractTypeChecker.kt
+171 -136
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@@ -13,15 +13,12 @@ import org.jetbrains.kotlin.utils.SmartSet
import java.util.*
abstract class AbstractTypeCheckerContext : TypeSystemContext {
abstract class AbstractTypeCheckerContext() {
abstract val typeSystemContext: TypeSystemContext
abstract fun substitutionSupertypePolicy(type: SimpleTypeMarker): SupertypesPolicy
override fun prepareType(type: KotlinTypeMarker): KotlinTypeMarker {
return type
}
open fun refineType(type: KotlinTypeMarker): KotlinTypeMarker {
return type
}
@@ -34,7 +31,6 @@ abstract class AbstractTypeCheckerContext : TypeSystemContext {
protected var argumentsDepth = 0
internal inline fun <T> runWithArgumentsSettings(subArgument: KotlinTypeMarker, f: AbstractTypeCheckerContext.() -> T): T {
if (argumentsDepth > 100) {
error("Arguments depth is too high. Some related argument: $subArgument")
@@ -46,7 +42,8 @@ abstract class AbstractTypeCheckerContext : TypeSystemContext {
return result
}
open fun getLowerCapturedTypePolicy(subType: SimpleTypeMarker, superType: CapturedTypeMarker): LowerCapturedTypePolicy = CHECK_SUBTYPE_AND_LOWER
open fun getLowerCapturedTypePolicy(subType: SimpleTypeMarker, superType: CapturedTypeMarker): LowerCapturedTypePolicy =
CHECK_SUBTYPE_AND_LOWER
open fun addSubtypeConstraint(
subType: KotlinTypeMarker,
@@ -109,7 +106,8 @@ abstract class AbstractTypeCheckerContext : TypeSystemContext {
if (!visitedSupertypes.add(current)) continue
val policy = supertypesPolicy(current).takeIf { it != SupertypesPolicy.None } ?: continue
for (supertype in current.typeConstructor().supertypes()) {
val supertypes = with(typeSystemContext) { current.typeConstructor().supertypes() }
for (supertype in supertypes) {
val newType = policy.transformType(this, supertype)
if (predicate(newType)) {
clear()
@@ -133,18 +131,21 @@ abstract class AbstractTypeCheckerContext : TypeSystemContext {
object UpperIfFlexible : SupertypesPolicy() {
override fun transformType(context: AbstractTypeCheckerContext, type: KotlinTypeMarker) =
with(context) { type.upperBoundIfFlexible() }
with(context.typeSystemContext) { type.upperBoundIfFlexible() }
}
object LowerIfFlexible : SupertypesPolicy() {
override fun transformType(context: AbstractTypeCheckerContext, type: KotlinTypeMarker) =
with(context) { type.lowerBoundIfFlexible() }
with(context.typeSystemContext) { type.lowerBoundIfFlexible() }
}
abstract class DoCustomTransform : SupertypesPolicy()
}
abstract val KotlinTypeMarker.isAllowedTypeVariable: Boolean
@JvmName("isAllowedTypeVariableBridge")
fun isAllowedTypeVariable(type: KotlinTypeMarker): Boolean = type.isAllowedTypeVariable
}
object AbstractTypeChecker {
@@ -166,7 +167,7 @@ object AbstractTypeChecker {
superConstructor: TypeConstructorMarker
): Boolean {
if (typeConstructor == superConstructor) return true
with(context) {
with(context.typeSystemContext) {
for (superType in typeConstructor.supertypes()) {
if (isSubtypeOfClass(context, superType.typeConstructor(), superConstructor)) {
return true
@@ -182,7 +183,7 @@ object AbstractTypeChecker {
b: KotlinTypeMarker,
stubTypesEqualToAnything: Boolean = true
): Boolean {
return AbstractTypeChecker.equalTypes(context.newBaseTypeCheckerContext(false, stubTypesEqualToAnything), a, b)
return equalTypes(context.newBaseTypeCheckerContext(false, stubTypesEqualToAnything), a, b)
}
fun isSubtypeOf(
@@ -195,55 +196,61 @@ object AbstractTypeChecker {
if (!context.customIsSubtypeOf(subType, superType)) return false
return with(context) {
completeIsSubTypeOf(prepareType(refineType(subType)), prepareType(refineType(superType)), isFromNullabilityConstraint)
}
return completeIsSubTypeOf(
context,
context.typeSystemContext.prepareType(context.refineType(subType)),
context.typeSystemContext.prepareType(context.refineType(superType)),
isFromNullabilityConstraint
)
}
fun equalTypes(context: AbstractTypeCheckerContext, a: KotlinTypeMarker, b: KotlinTypeMarker): Boolean = with(context) {
if (a === b) return true
fun equalTypes(context: AbstractTypeCheckerContext, a: KotlinTypeMarker, b: KotlinTypeMarker): Boolean =
with(context.typeSystemContext) {
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
if (isCommonDenotableType(a) && isCommonDenotableType(b)) {
val refinedA = context.refineType(a)
val refinedB = context.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 simpleA.isMarkedNullable() == refinedB.lowerBoundIfFlexible().isMarkedNullable()
}
}
return isSubtypeOf(context, a, b) && isSubtypeOf(context, b, a)
}
return isSubtypeOf(context, a, b) && isSubtypeOf(context, b, a)
}
private fun AbstractTypeCheckerContext.completeIsSubTypeOf(
private fun completeIsSubTypeOf(
context: AbstractTypeCheckerContext,
subType: KotlinTypeMarker,
superType: KotlinTypeMarker,
isFromNullabilityConstraint: Boolean
): Boolean {
checkSubtypeForSpecialCases(subType.lowerBoundIfFlexible(), superType.upperBoundIfFlexible())?.let {
addSubtypeConstraint(subType, superType, isFromNullabilityConstraint)
): Boolean = with(context.typeSystemContext) {
checkSubtypeForSpecialCases(context, subType.lowerBoundIfFlexible(), superType.upperBoundIfFlexible())?.let {
context.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 }
context.addSubtypeConstraint(subType, superType, isFromNullabilityConstraint)?.let { return it }
return isSubtypeOfForSingleClassifierType(subType.lowerBoundIfFlexible(), superType.upperBoundIfFlexible())
return isSubtypeOfForSingleClassifierType(context, subType.lowerBoundIfFlexible(), superType.upperBoundIfFlexible())
}
private fun AbstractTypeCheckerContext.checkSubtypeForIntegerLiteralType(
private fun checkSubtypeForIntegerLiteralType(
context: AbstractTypeCheckerContext,
subType: SimpleTypeMarker,
superType: SimpleTypeMarker
): Boolean? {
): Boolean? = with(context.typeSystemContext) {
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))
(possibleType.typeConstructor() == type.typeConstructor()) || (checkSupertypes && isSubtypeOf(context, type, possibleType))
}
fun isIntegerLiteralTypeInIntersectionComponents(type: SimpleTypeMarker): Boolean {
@@ -276,12 +283,12 @@ object AbstractTypeChecker {
return null
}
private fun AbstractTypeCheckerContext.hasNothingSupertype(type: SimpleTypeMarker): Boolean {
private fun hasNothingSupertype(context: AbstractTypeCheckerContext, type: SimpleTypeMarker): Boolean = with(context.typeSystemContext) {
val typeConstructor = type.typeConstructor()
if (typeConstructor.isClassTypeConstructor()) {
return typeConstructor.isNothingConstructor()
}
return anySupertype(type, { it.typeConstructor().isNothingConstructor() }) {
return context.anySupertype(type, { it.typeConstructor().isNothingConstructor() }) {
if (it.isClassType()) {
SupertypesPolicy.None
} else {
@@ -290,20 +297,24 @@ object AbstractTypeChecker {
}
}
private fun AbstractTypeCheckerContext.isSubtypeOfForSingleClassifierType(subType: SimpleTypeMarker, superType: SimpleTypeMarker): Boolean {
private fun isSubtypeOfForSingleClassifierType(
context: AbstractTypeCheckerContext,
subType: SimpleTypeMarker,
superType: SimpleTypeMarker
): Boolean = with(context.typeSystemContext) {
if (AbstractTypeChecker.RUN_SLOW_ASSERTIONS) {
assert(subType.isSingleClassifierType() || subType.typeConstructor().isIntersection() || subType.isAllowedTypeVariable) {
assert(subType.isSingleClassifierType() || subType.typeConstructor().isIntersection() || context.isAllowedTypeVariable(subType)) {
"Not singleClassifierType and not intersection subType: $subType"
}
assert(superType.isSingleClassifierType() || superType.isAllowedTypeVariable) {
assert(superType.isSingleClassifierType() || context .isAllowedTypeVariable(superType)) {
"Not singleClassifierType superType: $superType"
}
}
if (!AbstractNullabilityChecker.isPossibleSubtype(this, subType, superType)) return false
if (!AbstractNullabilityChecker.isPossibleSubtype(context, subType, superType)) return false
checkSubtypeForIntegerLiteralType(subType.lowerBoundIfFlexible(), superType.upperBoundIfFlexible())?.let {
addSubtypeConstraint(subType, superType)
checkSubtypeForIntegerLiteralType(context, subType.lowerBoundIfFlexible(), superType.upperBoundIfFlexible())?.let {
context.addSubtypeConstraint(subType, superType)
return it
}
@@ -312,10 +323,10 @@ object AbstractTypeChecker {
if (areEqualTypeConstructors(subType.typeConstructor(), superConstructor) && superConstructor.parametersCount() == 0) return true
if (superType.typeConstructor().isAnyConstructor()) return true
val supertypesWithSameConstructor = findCorrespondingSupertypes(subType, superConstructor)
val supertypesWithSameConstructor = findCorrespondingSupertypes(context, subType, superConstructor)
when (supertypesWithSameConstructor.size) {
0 -> return hasNothingSupertype(subType) // todo Nothing & Array<Number> <: Array<String>
1 -> return isSubtypeForSameConstructor(supertypesWithSameConstructor.first().asArgumentList(), superType)
0 -> return hasNothingSupertype(context, subType) // todo Nothing & Array<Number> <: Array<String>
1 -> return context.isSubtypeForSameConstructor(supertypesWithSameConstructor.first().asArgumentList(), superType)
else -> { // at least 2 supertypes with same constructors. Such case is rare
val newArguments = ArgumentList(superConstructor.parametersCount())
@@ -333,10 +344,10 @@ object AbstractTypeChecker {
newArguments.add(intersection)
}
if (!anyNonOutParameter && isSubtypeForSameConstructor(newArguments, superType)) return true
if (!anyNonOutParameter && context.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) }
return supertypesWithSameConstructor.any { context.isSubtypeForSameConstructor(it.asArgumentList(), superType) }
}
}
}
@@ -344,7 +355,7 @@ object AbstractTypeChecker {
fun AbstractTypeCheckerContext.isSubtypeForSameConstructor(
capturedSubArguments: TypeArgumentListMarker,
superType: SimpleTypeMarker
): Boolean {
): Boolean = with(this.typeSystemContext) {
// No way to check, as no index sometimes
//if (capturedSubArguments === superType.arguments) return true
@@ -375,7 +386,7 @@ object AbstractTypeChecker {
return true
}
private fun AbstractTypeCheckerContext.isCommonDenotableType(type: KotlinTypeMarker): Boolean =
private fun TypeSystemContext.isCommonDenotableType(type: KotlinTypeMarker): Boolean =
type.typeConstructor().isDenotable() &&
!type.isDynamic() && !type.isDefinitelyNotNullType() &&
type.lowerBoundIfFlexible().typeConstructor() == type.upperBoundIfFlexible().typeConstructor()
@@ -391,9 +402,13 @@ object AbstractTypeChecker {
return null
}
private fun AbstractTypeCheckerContext.checkSubtypeForSpecialCases(subType: SimpleTypeMarker, superType: SimpleTypeMarker): Boolean? {
private fun checkSubtypeForSpecialCases(
context: AbstractTypeCheckerContext,
subType: SimpleTypeMarker,
superType: SimpleTypeMarker
): Boolean? = with(context.typeSystemContext) {
if (subType.isError() || superType.isError()) {
if (isErrorTypeEqualsToAnything) return true
if (context.isErrorTypeEqualsToAnything) return true
if (subType.isMarkedNullable() && !superType.isMarkedNullable()) return false
@@ -404,7 +419,7 @@ object AbstractTypeChecker {
)
}
if (subType.isStubType() || superType.isStubType()) return isStubTypeEqualsToAnything
if (subType.isStubType() || superType.isStubType()) return context.isStubTypeEqualsToAnything
// superType might be a definitely notNull type (see KT-42824)
val superOriginalType = superType.asDefinitelyNotNullType()?.original() ?: superType
@@ -418,9 +433,9 @@ object AbstractTypeChecker {
} else {
if (superType.isDefinitelyNotNullType()) lowerType.makeDefinitelyNotNullOrNotNull() else lowerType
}
when (getLowerCapturedTypePolicy(subType, superTypeCaptured)) {
CHECK_ONLY_LOWER -> return isSubtypeOf(this, subType, nullableLowerType)
CHECK_SUBTYPE_AND_LOWER -> if (isSubtypeOf(this, subType, nullableLowerType)) return true
when (context.getLowerCapturedTypePolicy(subType, superTypeCaptured)) {
CHECK_ONLY_LOWER -> return isSubtypeOf(context, subType, nullableLowerType)
CHECK_SUBTYPE_AND_LOWER -> if (isSubtypeOf(context, subType, nullableLowerType)) return true
SKIP_LOWER -> Unit
}
}
@@ -429,17 +444,18 @@ object AbstractTypeChecker {
if (superTypeConstructor.isIntersection()) {
assert(!superType.isMarkedNullable()) { "Intersection type should not be marked nullable!: $superType" }
return superTypeConstructor.supertypes().all { isSubtypeOf(this, subType, it) }
return superTypeConstructor.supertypes().all { isSubtypeOf(context, subType, it) }
}
return null
}
private fun AbstractTypeCheckerContext.collectAllSupertypesWithGivenTypeConstructor(
private fun collectAllSupertypesWithGivenTypeConstructor(
context: AbstractTypeCheckerContext,
subType: SimpleTypeMarker,
superConstructor: TypeConstructorMarker
): List<SimpleTypeMarker> {
): List<SimpleTypeMarker> = with(context.typeSystemContext) {
subType.fastCorrespondingSupertypes(superConstructor)?.let {
return it
}
@@ -455,7 +471,7 @@ object AbstractTypeChecker {
val result: MutableList<SimpleTypeMarker> = SmartList()
anySupertype(subType, { false }) {
context.anySupertype(subType, { false }) {
val current = captureFromArguments(it, CaptureStatus.FOR_SUBTYPING) ?: it
@@ -468,7 +484,7 @@ object AbstractTypeChecker {
SupertypesPolicy.LowerIfFlexible
}
else -> {
substitutionSupertypePolicy(current)
context.substitutionSupertypePolicy(current)
}
}
}
@@ -476,8 +492,12 @@ object AbstractTypeChecker {
return result
}
private fun AbstractTypeCheckerContext.collectAndFilter(classType: SimpleTypeMarker, constructor: TypeConstructorMarker) =
selectOnlyPureKotlinSupertypes(collectAllSupertypesWithGivenTypeConstructor(classType, constructor))
private fun collectAndFilter(
context: AbstractTypeCheckerContext,
classType: SimpleTypeMarker,
constructor: TypeConstructorMarker
) =
selectOnlyPureKotlinSupertypes(context, collectAllSupertypesWithGivenTypeConstructor(context, classType, constructor))
/**
@@ -490,7 +510,10 @@ object AbstractTypeChecker {
*
* More tests: javaAndKotlinSuperType & purelyImplementedCollection folder
*/
private fun AbstractTypeCheckerContext.selectOnlyPureKotlinSupertypes(supertypes: List<SimpleTypeMarker>): List<SimpleTypeMarker> {
private fun selectOnlyPureKotlinSupertypes(
context: AbstractTypeCheckerContext,
supertypes: List<SimpleTypeMarker>
): List<SimpleTypeMarker> = with(context.typeSystemContext) {
if (supertypes.size < 2) return supertypes
val allPureSupertypes = supertypes.filter {
@@ -502,22 +525,23 @@ object AbstractTypeChecker {
// nullability was checked earlier via nullabilityChecker
// should be used only if you really sure that it is correct
fun AbstractTypeCheckerContext.findCorrespondingSupertypes(
fun findCorrespondingSupertypes(
context: AbstractTypeCheckerContext,
subType: SimpleTypeMarker,
superConstructor: TypeConstructorMarker
): List<SimpleTypeMarker> {
): List<SimpleTypeMarker> = with(context.typeSystemContext) {
if (subType.isClassType()) {
return collectAndFilter(subType, superConstructor)
return collectAndFilter(context, subType, superConstructor)
}
// i.e. superType is not a classType
if (!superConstructor.isClassTypeConstructor() && !superConstructor.isIntegerLiteralTypeConstructor()) {
return collectAllSupertypesWithGivenTypeConstructor(subType, superConstructor)
return collectAllSupertypesWithGivenTypeConstructor(context, subType, superConstructor)
}
// todo add tests
val classTypeSupertypes = SmartList<SimpleTypeMarker>()
anySupertype(subType, { false }) {
context.anySupertype(subType, { false }) {
if (it.isClassType()) {
classTypeSupertypes.add(it)
SupertypesPolicy.None
@@ -526,7 +550,7 @@ object AbstractTypeChecker {
}
}
return classTypeSupertypes.flatMap { collectAndFilter(it, superConstructor) }
return classTypeSupertypes.flatMap { collectAndFilter(context, it, superConstructor) }
}
}
@@ -534,7 +558,7 @@ object AbstractTypeChecker {
object AbstractNullabilityChecker {
// this method checks only nullability
fun isPossibleSubtype(context: AbstractTypeCheckerContext, subType: SimpleTypeMarker, superType: SimpleTypeMarker): Boolean =
context.runIsPossibleSubtype(subType, superType)
runIsPossibleSubtype(context, subType, superType)
fun isSubtypeOfAny(context: TypeCheckerProviderContext, type: KotlinTypeMarker): Boolean =
AbstractNullabilityChecker.isSubtypeOfAny(
@@ -546,82 +570,93 @@ object AbstractNullabilityChecker {
)
fun isSubtypeOfAny(context: AbstractTypeCheckerContext, type: KotlinTypeMarker): Boolean =
with(context) {
hasNotNullSupertype(type.lowerBoundIfFlexible(), SupertypesPolicy.LowerIfFlexible)
with(context.typeSystemContext) {
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"
private fun runIsPossibleSubtype(context: AbstractTypeCheckerContext, subType: SimpleTypeMarker, superType: SimpleTypeMarker): Boolean =
with(context.typeSystemContext) {
if (AbstractTypeChecker.RUN_SLOW_ASSERTIONS) {
// it makes for case String? & Any <: String
assert(
subType.isSingleClassifierType() || subType.typeConstructor().isIntersection() || context.isAllowedTypeVariable(
subType
)
) {
"Not singleClassifierType and not intersection subType: $subType"
}
assert(superType.isSingleClassifierType() || context.isAllowedTypeVariable(superType)) {
"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 (context.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 (context.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<T>, A<in Number> => \exist Q : Number <: Q. A<Q>
* 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(context, subType, superType.typeConstructor())
}
// 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<T>, A<in Number> => \exist Q : Number <: Q. A<Q>
* 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
with(typeSystemContext) {
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 }
hasPathByNotMarkedNullableNodes(
newBaseTypeCheckerContext(errorTypesEqualToAnything = false, stubTypesEqualToAnything = true), start, end
)
private fun AbstractTypeCheckerContext.isApplicableAsEndNode(type: SimpleTypeMarker, end: TypeConstructorMarker): Boolean {
if (type.isNothing()) return true
if (type.isMarkedNullable()) return false
fun hasPathByNotMarkedNullableNodes(context: AbstractTypeCheckerContext, start: SimpleTypeMarker, end: TypeConstructorMarker) =
with(context.typeSystemContext) {
context.anySupertype(
start,
{ isApplicableAsEndNode(context, it, end) },
{ if (it.isMarkedNullable()) SupertypesPolicy.None else SupertypesPolicy.LowerIfFlexible }
)
}
if (isStubTypeEqualsToAnything && type.isStubType()) return true
private fun isApplicableAsEndNode(context: AbstractTypeCheckerContext, type: SimpleTypeMarker, end: TypeConstructorMarker): Boolean =
with(context.typeSystemContext) {
if (type.isNothing()) return true
if (type.isMarkedNullable()) return false
return areEqualTypeConstructors(type.typeConstructor(), end)
}
if (context.isStubTypeEqualsToAnything && type.isStubType()) return true
return areEqualTypeConstructors(type.typeConstructor(), end)
}
}