KAPT+IR: support nullability for error types

#KT-49682

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/IrType.kt

@@ -29,7 +29,11 @@ abstract class IrType : KotlinTypeMarker, IrAnnotationContainer {
     abstract override fun hashCode(): Int
 }
 
-abstract class IrErrorType(kotlinType: KotlinType?, private val errorClassStubSymbol: IrClassSymbol) : IrTypeBase(kotlinType), SimpleTypeMarker {
+abstract class IrErrorType(
+    kotlinType: KotlinType?,
+    private val errorClassStubSymbol: IrClassSymbol,
+    val isMarkedNullable: Boolean = false
+) : IrTypeBase(kotlinType), SimpleTypeMarker {
     val symbol: IrClassSymbol
         get() = errorClassStubSymbol
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/IrTypeUtils.kt

@@ -47,6 +47,7 @@ fun IrType.isNullable(): Boolean =
             else -> error("Unsupported classifier: $classifier")
         }
         is IrDynamicType -> true
+        is IrErrorType -> this.isMarkedNullable
         else -> false
     }
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/impl/IrErrorClassImpl.kt

@@ -0,0 +1,55 @@
+/*
+ * 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.ir.types.impl
+
+import org.jetbrains.kotlin.descriptors.ClassKind
+import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
+import org.jetbrains.kotlin.descriptors.Modality
+import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
+import org.jetbrains.kotlin.ir.IrFileEntry
+import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
+import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
+import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.declarations.impl.IrClassImpl
+import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
+import org.jetbrains.kotlin.ir.symbols.IrFileSymbol
+import org.jetbrains.kotlin.ir.symbols.impl.IrClassSymbolImpl
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
+
+object IrErrorClassImpl : IrClassImpl(
+    UNDEFINED_OFFSET, UNDEFINED_OFFSET, IrDeclarationOrigin.ERROR_CLASS, IrClassSymbolImpl(),
+    Name.special("<error>"), ClassKind.CLASS, DescriptorVisibilities.DEFAULT_VISIBILITY, Modality.FINAL
+) {
+    override var parent: IrDeclarationParent
+        get() = object : IrFile() {
+            override val startOffset: Int
+                get() = TODO("Not yet implemented")
+            override val endOffset: Int
+                get() = TODO("Not yet implemented")
+            override var annotations: List<IrConstructorCall>
+                get() = TODO("Not yet implemented")
+                set(_) {}
+            override val declarations: MutableList<IrDeclaration>
+                get() = TODO("Not yet implemented")
+            override val symbol: IrFileSymbol
+                get() = TODO("Not yet implemented")
+            override val module: IrModuleFragment
+                get() = TODO("Not yet implemented")
+            override val fileEntry: IrFileEntry
+                get() = TODO("Not yet implemented")
+            override var metadata: MetadataSource?
+                get() = TODO("Not yet implemented")
+                set(_) {}
+
+            @ObsoleteDescriptorBasedAPI
+            override val packageFragmentDescriptor: PackageFragmentDescriptor
+                get() = TODO("Not yet implemented")
+            override val fqName: FqName
+                get() = FqName.ROOT
+        }
+        set(_) = TODO()
+}

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/impl/IrTypeBase.kt

@@ -5,26 +5,11 @@
 
 package org.jetbrains.kotlin.ir.types.impl
 
-import org.jetbrains.kotlin.descriptors.ClassKind
+import org.jetbrains.kotlin.ir.declarations.IrFunction
-import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
+import org.jetbrains.kotlin.ir.declarations.IrTypeParameter
-import org.jetbrains.kotlin.descriptors.Modality
-import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
-import org.jetbrains.kotlin.ir.IrFileEntry
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
-import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
-import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.declarations.impl.IrClassImpl
-import org.jetbrains.kotlin.ir.declarations.impl.IrValueParameterImpl
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
 import org.jetbrains.kotlin.ir.symbols.IrClassifierSymbol
-import org.jetbrains.kotlin.ir.symbols.IrFileSymbol
-import org.jetbrains.kotlin.ir.symbols.IrValueParameterSymbol
-import org.jetbrains.kotlin.ir.symbols.impl.IrClassSymbolImpl
-import org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl
 import org.jetbrains.kotlin.ir.types.*
-import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.name.Name
-import org.jetbrains.kotlin.name.SpecialNames
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.types.model.CaptureStatus
@@ -40,46 +25,13 @@ class IrErrorTypeImpl(
     kotlinType: KotlinType?,
     override val annotations: List<IrConstructorCall>,
     override val variance: Variance,
-) : IrErrorType(kotlinType, IrErrorClassImpl.symbol) {
+    isMarkedNullable: Boolean = false
+) : IrErrorType(kotlinType, IrErrorClassImpl.symbol, isMarkedNullable) {
     override fun equals(other: Any?): Boolean = other is IrErrorTypeImpl
 
     override fun hashCode(): Int = IrErrorTypeImpl::class.java.hashCode()
 }
 
-object IrErrorClassImpl : IrClassImpl(
-    UNDEFINED_OFFSET, UNDEFINED_OFFSET, IrDeclarationOrigin.ERROR_CLASS, IrClassSymbolImpl(),
-    Name.special("<error>"), ClassKind.CLASS, DescriptorVisibilities.DEFAULT_VISIBILITY, Modality.FINAL
-) {
-    override var parent: IrDeclarationParent
-        get() = object: IrFile() {
-            override val startOffset: Int
-                get() = TODO("Not yet implemented")
-            override val endOffset: Int
-                get() = TODO("Not yet implemented")
-            override var annotations: List<IrConstructorCall>
-                get() = TODO("Not yet implemented")
-                set(_) {}
-            override val declarations: MutableList<IrDeclaration>
-                get() = TODO("Not yet implemented")
-            override val symbol: IrFileSymbol
-                get() = TODO("Not yet implemented")
-            override val module: IrModuleFragment
-                get() = TODO("Not yet implemented")
-            override val fileEntry: IrFileEntry
-                get() = TODO("Not yet implemented")
-            override var metadata: MetadataSource?
-                get() = TODO("Not yet implemented")
-                set(_) {}
-
-            @ObsoleteDescriptorBasedAPI
-            override val packageFragmentDescriptor: PackageFragmentDescriptor
-                get() = TODO("Not yet implemented")
-            override val fqName: FqName
-                get() = FqName.ROOT
-        }
-        set(_) = TODO()
-}
-
 class IrDynamicTypeImpl(
     kotlinType: KotlinType?,
     override val annotations: List<IrConstructorCall>,
@@ -90,7 +42,6 @@ class IrDynamicTypeImpl(
     override fun hashCode(): Int = IrDynamicTypeImpl::class.java.hashCode()
 }
 
-
 val IrType.originalKotlinType: KotlinType?
     get() = safeAs<IrTypeBase>()?.kotlinType
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/TypeTranslator.kt

@@ -99,6 +99,7 @@ abstract class TypeTranslator(
                     approximatedType,
                     translateTypeAnnotations(approximatedType),
                     variance,
+                    isMarkedNullable = approximatedType.isMarkedNullable,
                 )
             approximatedType.isDynamic() ->
                 return IrDynamicTypeImpl(approximatedType, translateTypeAnnotations(approximatedType), variance)