FIR: handle unresolved modality as questionable

compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -45,7 +45,7 @@ class RawFirBuilder(val session: FirSession) {
             }
         }
 
-    private val KtDeclaration.modality: Modality
+    private val KtDeclaration.modality: Modality?
         get() {
             val modifierType = modalityModifierType()
             return when (modifierType) {
@@ -53,7 +53,7 @@ class RawFirBuilder(val session: FirSession) {
                 KtTokens.SEALED_KEYWORD -> Modality.SEALED
                 KtTokens.ABSTRACT_KEYWORD -> Modality.ABSTRACT
                 KtTokens.OPEN_KEYWORD -> Modality.OPEN
-                else -> Modality.FINAL // FIX ME
+                else -> null
             }
         }
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt

@@ -106,6 +106,16 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
             else -> toString()
         }
 
+    private fun FirMemberDeclaration.modalityAsString(): String {
+        return modality?.name?.toLowerCase() ?: run {
+            if (this is FirCallableMember && this.isOverride) {
+                "open?"
+            } else {
+                "final?"
+            }
+        }
+    }
+
     override fun visitMemberDeclaration(memberDeclaration: FirMemberDeclaration) {
         memberDeclaration.annotations.renderAnnotations()
         if (memberDeclaration.typeParameters.isNotEmpty()) {
@@ -113,7 +123,7 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
             memberDeclaration.typeParameters.renderSeparated()
             print("> ")
         }
-        print(memberDeclaration.visibility.asString() + " " + memberDeclaration.modality.name.toLowerCase() + " ")
+        print(memberDeclaration.visibility.asString() + " " + memberDeclaration.modalityAsString() + " ")
         if (memberDeclaration is FirCallableMember && memberDeclaration.isOverride) {
             print("override ")
         }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirMemberDeclaration.kt

@@ -13,7 +13,7 @@ import org.jetbrains.kotlin.fir.visitors.FirVisitor
 interface FirMemberDeclaration : FirTypeParameterContainer, FirNamedDeclaration, FirAnnotationContainer {
     val visibility: Visibility
 
-    val modality: Modality
+    val modality: Modality?
 
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
         visitor.visitMemberDeclaration(this, data)

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirResolvedClass.kt

@@ -5,10 +5,13 @@
 
 package org.jetbrains.kotlin.fir.declarations
 
+import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.fir.FirDescriptorOwner
 import org.jetbrains.kotlin.fir.visitors.FirVisitor
 
 interface FirResolvedClass : FirClass, FirDescriptorOwner<FirResolvedClass> {
+    override val modality: Modality
+
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
         visitor.visitResolvedClass(this, data)
 }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirResolvedTypeAlias.kt

@@ -5,10 +5,13 @@
 
 package org.jetbrains.kotlin.fir.declarations
 
+import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.fir.FirDescriptorOwner
 import org.jetbrains.kotlin.fir.visitors.FirVisitor
 
 interface FirResolvedTypeAlias : FirTypeAlias, FirDescriptorOwner<FirResolvedTypeAlias> {
+    override val modality: Modality
+
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
         visitor.visitResolvedTypeAlias(this, data)
 }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractCallableMember.kt

@@ -21,7 +21,7 @@ abstract class FirAbstractCallableMember(
     psi: PsiElement?,
     name: Name,
     visibility: Visibility,
-    modality: Modality,
+    modality: Modality?,
     final override val isOverride: Boolean,
     final override var receiverType: FirType?,
     final override var returnType: FirType

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractMemberDeclaration.kt

@@ -18,7 +18,7 @@ abstract class FirAbstractMemberDeclaration(
     psi: PsiElement?,
     name: Name,
     final override val visibility: Visibility,
-    final override val modality: Modality
+    final override val modality: Modality?
 ) : FirAbstractNamedAnnotatedDeclaration(session, psi, name), FirMemberDeclaration {
     final override val typeParameters = mutableListOf<FirTypeParameter>()
 }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirClassImpl.kt

@@ -22,7 +22,7 @@ open class FirClassImpl(
     psi: PsiElement?,
     name: Name,
     visibility: Visibility,
-    modality: Modality,
+    modality: Modality?,
     final override val classKind: ClassKind,
     final override val isInner: Boolean,
     final override val isCompanion: Boolean,

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberFunctionImpl.kt

@@ -23,7 +23,7 @@ class FirMemberFunctionImpl(
     psi: PsiElement?,
     name: Name,
     visibility: Visibility,
-    modality: Modality,
+    modality: Modality?,
     isOverride: Boolean,
     override val isOperator: Boolean,
     override val isInfix: Boolean,

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberPropertyImpl.kt

@@ -23,7 +23,7 @@ class FirMemberPropertyImpl(
     psi: PsiElement?,
     name: Name,
     visibility: Visibility,
-    modality: Modality,
+    modality: Modality?,
     isOverride: Boolean,
     override val isConst: Boolean,
     receiverType: FirType?,

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirResolvedClassImpl.kt

@@ -5,6 +5,8 @@
 
 package org.jetbrains.kotlin.fir.declarations.impl
 
+import org.jetbrains.kotlin.descriptors.ClassKind
+import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.fir.FirBasedDescriptor
 import org.jetbrains.kotlin.fir.declarations.FirClass
 import org.jetbrains.kotlin.fir.declarations.FirResolvedClass
@@ -17,6 +19,9 @@ class FirResolvedClassImpl(val delegate: FirClass, override val descriptor: FirB
         descriptor.bind(this)
     }
 
+    override val modality: Modality
+        get() = delegate.modality ?: if (classKind == ClassKind.INTERFACE) Modality.ABSTRACT else Modality.FINAL
+
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R {
         return super<FirResolvedClass>.accept(visitor, data)
     }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirResolvedTypeAliasImpl.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.fir.declarations.impl
 
+import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.fir.FirBasedDescriptor
 import org.jetbrains.kotlin.fir.declarations.FirResolvedTypeAlias
 import org.jetbrains.kotlin.fir.declarations.FirTypeAlias
@@ -13,6 +14,9 @@ import org.jetbrains.kotlin.fir.visitors.FirVisitor
 class FirResolvedTypeAliasImpl(val delegate: FirTypeAlias, override val descriptor: FirBasedDescriptor<FirResolvedTypeAlias>) :
     FirResolvedTypeAlias, FirTypeAlias by delegate {
 
+    override val modality: Modality
+        get() = delegate.modality ?: Modality.FINAL
+
     init {
         descriptor.bind(this)
     }

compiler/testData/fir/rawBuilder/declarations/F.txt

@@ -1,5 +1,5 @@
 FILE: F.kt
     public? open class A() {
     }
-    public? final class B() : A {
+    public? final? class B() : A {
     }

compiler/testData/fir/rawBuilder/declarations/NestedOfAliasedType.txt

@@ -5,8 +5,8 @@ FILE: NestedOfAliasedType.kt
 
     }
     public? final typealias TA = A
-    public? final class B() : TA {
-        public? final class NestedInB() : Nested {
+    public? final? class B() : TA {
+        public? final? class NestedInB() : Nested {
         }
 
     }

compiler/testData/fir/rawBuilder/declarations/NestedSuperType.txt

@@ -7,8 +7,8 @@ FILE: NestedSuperType.kt
         }
 
     }
-    public? final class Your() : My {
-        public? final class NestedThree() : NestedOne {
+    public? final? class Your() : My {
+        public? final? class NestedThree() : NestedOne {
         }
 
     }

compiler/testData/fir/rawBuilder/declarations/complexTypes.txt

@@ -1,11 +1,11 @@
 FILE: complexTypes.kt
-    <T, out S> public? final class C() {
-        <R, in P> public? final class D(inner) {
+    <T, out S> public? final? class C() {
+        <R, in P> public? final? class D(inner) {
         }
 
     }
-    public? final interface Test() {
-        public? final property x(val): a.b.C<out CharSequence, *>.D<in List<*>, *>
+    public? final? interface Test() {
+        public? final? property x(val): a.b.C<out CharSequence, *>.D<in List<*>, *>
             public? get(): a.b.C<out CharSequence, *>.D<in List<*>, *>
 
     }

compiler/testData/fir/rawBuilder/declarations/derivedClass.txt

@@ -3,10 +3,10 @@ FILE: derivedClass.kt
         public? constructor(x: T)
 
     }
-    <T : Any> public? final class Derived() : Base<T> {
+    <T : Any> public? final? class Derived() : Base<T> {
         public? constructor(x: T)STUB
 
     }
-    <T : Any> public? final function create(x: T): Derived<T> {
+    <T : Any> public? final? function create(x: T): Derived<T> {
         STUB
     }

compiler/testData/fir/rawBuilder/declarations/enums.txt

@@ -1,5 +1,5 @@
 FILE: enums.kt
-    public? final enum class Order() {
+    public? final? enum class Order() {
         public? final enum entry FIRST() {
         }
 
@@ -10,34 +10,34 @@ FILE: enums.kt
         }
 
     }
-    public? final enum class Planet() {
+    public? final? enum class Planet() {
         public? constructor(m: Double, r: Double)
 
         public? final enum entry MERCURY() : Planet {
-            public? final override function sayHello(): <implicit> {
+            public? open? override function sayHello(): <implicit> {
             }
 
         }
 
         public? final enum entry VENERA() : Planet {
-            public? final override function sayHello(): <implicit> {
+            public? open? override function sayHello(): <implicit> {
             }
 
         }
 
         public? final enum entry EARTH() : Planet {
-            public? final override function sayHello(): <implicit> {
+            public? open? override function sayHello(): <implicit> {
             }
 
         }
 
-        public? final property g(val): Double = STUB
+        public? final? property g(val): Double = STUB
             public? get(): Double
 
         public? abstract function sayHello(): <implicit>
 
-        public? final object Companion(companion) {
-            public? final const property G(val): <implicit> = STUB
+        public? final? object Companion(companion) {
+            public? final? const property G(val): <implicit> = STUB
                 public? get(): <implicit>
 
         }

compiler/testData/fir/rawBuilder/declarations/enums2.txt

@@ -1,22 +1,22 @@
 FILE: enums2.kt
-    public? final interface Some() {
+    public? final? interface Some() {
     }
-    public? final object O1() : Some {
+    public? final? object O1() : Some {
     }
-    public? final object O2() : Some {
+    public? final? object O2() : Some {
     }
-    public? final enum class SomeEnum() {
+    public? final? enum class SomeEnum() {
         public? constructor(x: Some)
 
         public? final enum entry FIRST() : SomeEnum {
-            public? final override function check(y: Some): Boolean {
+            public? open? override function check(y: Some): Boolean {
                 STUB
             }
 
         }
 
         public? final enum entry SECOND() : SomeEnum {
-            public? final override function check(y: Some): Boolean {
+            public? open? override function check(y: Some): Boolean {
                 STUB
             }
 

compiler/testData/fir/rawBuilder/declarations/functionTypes.txt

@@ -1,9 +1,9 @@
 FILE: functionTypes.kt
-    <T> public? final function simpleRun(f: ( (<no name provided>: T): Unit )): Unit {
+    <T> public? final? function simpleRun(f: ( (<no name provided>: T): Unit )): Unit {
         STUB
     }
-    <T, R> public? final function simpleMapList<T>.(f: ( (<no name provided>: T): R )): R {
+    <T, R> public? final? function simpleMapList<T>.(f: ( (<no name provided>: T): R )): R {
     }
-    <T> public? final function simpleWith(t: T, f: ( T.(): Unit )): Unit {
+    <T> public? final? function simpleWith(t: T, f: ( T.(): Unit )): Unit {
         STUB
     }

compiler/testData/fir/rawBuilder/declarations/genericFunctions.txt

@@ -1,7 +1,7 @@
 FILE: genericFunctions.kt
-    public? final interface Any() {
+    public? final? interface Any() {
     }
-    <T : Any> public? final inline function safeAsAny.(): T? {
+    <T : Any> public? final? inline function safeAsAny.(): T? {
         STUB
     }
     public? abstract class Summator() {

compiler/testData/fir/rawBuilder/declarations/nestedClass.txt

@@ -3,13 +3,13 @@ FILE: nestedClass.kt
         public? constructor(s: String)
 
     }
-    public? final class Outer() {
-        public? final class Derived() : Base {
+    public? final? class Outer() {
+        public? final? class Derived() : Base {
             public? constructor(s: String)STUB
 
         }
 
-        public? final object Obj() : Base {
+        public? final? object Obj() : Base {
         }
 
     }

compiler/testData/fir/rawBuilder/declarations/simpleClass.txt

@@ -1,26 +1,26 @@
 FILE: simpleClass.kt
-    public? final interface SomeInterface() {
-        public? final function foo(x: Int, y: String): String
+    public? final? interface SomeInterface() {
+        public? final? function foo(x: Int, y: String): String
 
-        public? final property bar(val): Boolean
+        public? final? property bar(val): Boolean
             public? get(): Boolean
 
     }
-    public? final class SomeClass() : SomeInterface {
-        private final property baz(val): <implicit> = STUB
+    public? final? class SomeClass() : SomeInterface {
+        private final? property baz(val): <implicit> = STUB
             public? get(): <implicit>
 
-        public? final override function foo(x: Int, y: String): String {
+        public? open? override function foo(x: Int, y: String): String {
         }
 
-        public? final override property bar(var): Boolean
+        public? open? override property bar(var): Boolean
             public? get(): <implicit> {
                 STUB
             }
             public? set(value: Boolean): <implicit> {
             }
 
-        public? final property fau(var): Double
+        public? final? property fau(var): Double
             public? get(): Double
             public? set(value: Double): R/kotlin.Unit/
 

compiler/testData/fir/rawBuilder/declarations/simpleFun.txt

@@ -1,3 +1,3 @@
 FILE: simpleFun.kt
-    public? final function foo(): <implicit> {
+    public? final? function foo(): <implicit> {
     }

compiler/testData/fir/rawBuilder/declarations/simpleTypeAlias.txt

@@ -1,6 +1,6 @@
 FILE: simpleTypeAlias.kt
-    public? final interface B() {
+    public? final? interface B() {
     }
     public? final typealias C = B
-    public? final class D() : C {
+    public? final? class D() : C {
     }

compiler/testData/fir/rawBuilder/declarations/typeAliasWithGeneric.txt

@@ -1,8 +1,8 @@
 FILE: typeAliasWithGeneric.kt
     public? open class A() {
     }
-    <S, T : A> public? final interface B() {
+    <S, T : A> public? final? interface B() {
     }
     public? final typealias C = B<T, A>
-    public? final class D() : C<A> {
+    public? final? class D() : C<A> {
     }

compiler/testData/fir/rawBuilder/declarations/typeParameterVsNested.txt

@@ -1,8 +1,8 @@
 FILE: typeParameterVsNested.kt
-    public? final interface Some() {
+    public? final? interface Some() {
     }
     <T : Some> public? abstract class My() {
-        public? final class T(inner) {
+        public? final? class T(inner) {
         }
 
         public? abstract property x(val): T
@@ -16,7 +16,7 @@ FILE: typeParameterVsNested.kt
         public? abstract property z(val): test.My.T
             public? get(): test.My.T
 
-        public? final class Some() : T {
+        public? final? class Some() : T {
         }
 
     }

compiler/testData/fir/rawBuilder/declarations/typeParameters.txt

@@ -1,20 +1,20 @@
 FILE: typeParameters.kt
-    <out T : Any> public? final interface List() {
-        public? final operator function get(index: Int): T
+    <out T : Any> public? final? interface List() {
+        public? final? operator function get(index: Int): T
 
-        public? final infix function concat(other: List<T>): List<T>
+        public? final? infix function concat(other: List<T>): List<T>
 
     }
     public? final typealias StringList = List<out String>
     public? final typealias AnyList = List<*>
     <out T : Any> public? abstract class AbstractList() : List<T> {
     }
-    public? final class SomeList() : AbstractList<Int> {
-        public? final override function get(index: Int): Int {
+    public? final? class SomeList() : AbstractList<Int> {
+        public? open? override function get(index: Int): Int {
             STUB
         }
 
-        public? final override function concat(other: List<Int>): List<Int> {
+        public? open? override function concat(other: List<Int>): List<Int> {
             STUB
         }
 

compiler/testData/fir/resolve/NestedOfAliasedType.txt

@@ -6,7 +6,7 @@ FILE: NestedOfAliasedType.kt
     }
     (resolved) public? final typealias TA = R/<root>.A/
     (resolved) public? final class B() : R/<root>.TA = <root>.A/ {
-        public? final class NestedInB() : R/<root>.A.Nested/ {
+        public? final? class NestedInB() : R/<root>.A.Nested/ {
         }
 
     }

compiler/testData/fir/resolve/NestedSuperType.txt

@@ -8,7 +8,7 @@ FILE: NestedSuperType.kt
 
     }
     (resolved) public? final class Your() : R/p.My/ {
-        public? final class NestedThree() : R/p.My.NestedOne/ {
+        public? final? class NestedThree() : R/p.My.NestedOne/ {
         }
 
     }

compiler/testData/fir/resolve/multifile/NestedSuperType.txt

@@ -1,9 +1,9 @@
 FILE: NestedSuperType.kt
     (resolved) public? final class A() : R/b.B/ {
-        public? final class NestedInA1() : R/b.B.NestedInB/ {
+        public? final? class NestedInA1() : R/b.B.NestedInB/ {
         }
 
-        public? final class NestedInA2() : R/c.C.NestedInC/ {
+        public? final? class NestedInA2() : R/c.C.NestedInC/ {
         }
 
     }

compiler/testData/fir/resolve/simpleClass.txt

@@ -1,26 +1,26 @@
 FILE: simpleClass.kt
-    (resolved) public? final interface SomeInterface() {
-        public? final function foo(x: R/error: Failed to resolve qualified type/, y: R/error: Failed to resolve qualified type/): R/error: Failed to resolve qualified type/
+    (resolved) public? abstract interface SomeInterface() {
+        public? final? function foo(x: R/error: Failed to resolve qualified type/, y: R/error: Failed to resolve qualified type/): R/error: Failed to resolve qualified type/
 
-        public? final property bar(val): R/error: Failed to resolve qualified type/
+        public? final? property bar(val): R/error: Failed to resolve qualified type/
             public? get(): R/error: Failed to resolve qualified type/
 
     }
     (resolved) public? final class SomeClass() : R/<root>.SomeInterface/ {
-        private final property baz(val): R/error: Not supported: FirImplicitTypeImpl/ = STUB
+        private final? property baz(val): R/error: Not supported: FirImplicitTypeImpl/ = STUB
             public? get(): R/error: Not supported: FirImplicitTypeImpl/
 
-        public? final override function foo(x: R/error: Failed to resolve qualified type/, y: R/error: Failed to resolve qualified type/): R/error: Failed to resolve qualified type/ {
+        public? open? override function foo(x: R/error: Failed to resolve qualified type/, y: R/error: Failed to resolve qualified type/): R/error: Failed to resolve qualified type/ {
         }
 
-        public? final override property bar(var): R/error: Failed to resolve qualified type/
+        public? open? override property bar(var): R/error: Failed to resolve qualified type/
             public? get(): R/error: Not supported: FirImplicitTypeImpl/ {
                 STUB
             }
             public? set(value: R/error: Failed to resolve qualified type/): R/error: Not supported: FirImplicitTypeImpl/ {
             }
 
-        public? final property fau(var): R/error: Failed to resolve qualified type/
+        public? final? property fau(var): R/error: Failed to resolve qualified type/
             public? get(): R/error: Failed to resolve qualified type/
             public? set(value: R/error: Failed to resolve qualified type/): R/kotlin.Unit/
 

compiler/testData/fir/resolve/simpleTypeAlias.txt

@@ -1,5 +1,5 @@
 FILE: simpleTypeAlias.kt
-    (resolved) public? final interface B() {
+    (resolved) public? abstract interface B() {
     }
     (resolved) public? final typealias C = R/<root>.B/
     (resolved) public? final class D() : R/<root>.C = <root>.B/ {