FIR: add classifiers to local scopes, process local class symbols correctly

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

@@ -15,7 +15,7 @@ import org.jetbrains.kotlin.name.FqName
 class Context {
     lateinit var packageFqName: FqName
     var className: FqName = FqName.ROOT
-    val currentClassId get() = ClassId(packageFqName, className, false)
+    val currentClassId get() = ClassId(packageFqName, className, firFunctions.isNotEmpty())
 
     val firFunctions = mutableListOf<FirFunction<*>>()
     val firFunctionCalls = mutableListOf<FirFunctionCall>()

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/FirCallResolver.kt

@@ -27,7 +27,9 @@ import org.jetbrains.kotlin.fir.resolve.transformers.phasedFir
 import org.jetbrains.kotlin.fir.scopes.FirScope
 import org.jetbrains.kotlin.fir.scopes.impl.FirLocalScope
 import org.jetbrains.kotlin.fir.symbols.AbstractFirBasedSymbol
+import org.jetbrains.kotlin.fir.symbols.StandardClassIds
 import org.jetbrains.kotlin.fir.symbols.impl.*
+import org.jetbrains.kotlin.fir.symbols.invoke
 import org.jetbrains.kotlin.fir.types.ConeKotlinErrorType
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.FirTypeRef
@@ -204,7 +206,14 @@ class FirCallResolver(
         if (referencedSymbol is FirClassLikeSymbol<*>) {
             val classId = referencedSymbol.classId
             return FirResolvedQualifierImpl(nameReference.source, classId.packageFqName, classId.relativeClassName).apply {
-                resultType = typeForQualifier(this)
+                resultType = if (classId.isLocal) {
+                    typeForQualifierByDeclaration(referencedSymbol.fir, resultType)
+                        ?: resultType.resolvedTypeFromPrototype(
+                            StandardClassIds.Unit(symbolProvider).constructType(emptyArray(), isNullable = false)
+                        )
+                } else {
+                    typeForQualifier(this)
+                }
             }
         }
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/FirProvider.kt

@@ -15,7 +15,7 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 
 abstract class FirProvider : FirSymbolProvider() {
-    abstract fun getFirClassifierByFqName(fqName: ClassId): FirClassLikeDeclaration<*>?
+    abstract fun getFirClassifierByFqName(classId: ClassId): FirClassLikeDeclaration<*>?
 
     abstract override fun getClassLikeSymbolByFqName(classId: ClassId): FirClassLikeSymbol<*>?
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/ResolveUtils.kt

@@ -242,26 +242,12 @@ fun BodyResolveComponents.typeForQualifier(resolvedQualifier: FirResolvedQualifi
     if (classId != null) {
         val classSymbol = symbolProvider.getClassLikeSymbolByFqName(classId)!!
         val declaration = classSymbol.phasedFir
-        if (declaration is FirClass) {
-            if (declaration.classKind == ClassKind.OBJECT) {
-                return resultType.resolvedTypeFromPrototype(
-                    classSymbol.constructType(emptyArray(), false)
-                )
-            } else if (declaration.classKind == ClassKind.ENUM_ENTRY) {
-                val enumClassSymbol = symbolProvider.getClassLikeSymbolByFqName(classSymbol.classId.outerClassId!!)!!
-                return resultType.resolvedTypeFromPrototype(
-                    enumClassSymbol.constructType(emptyArray(), false)
-                )
-            } else {
-                if (declaration is FirRegularClass) {
-                    val companionObject = declaration.companionObject
-                    if (companionObject != null) {
-                        return resultType.resolvedTypeFromPrototype(
-                            companionObject.symbol.constructType(emptyArray(), false)
-                        )
-                    }
-                }
-            }
+        typeForQualifierByDeclaration(declaration, resultType)?.let { return it }
+        if (declaration is FirRegularClass && declaration.classKind == ClassKind.ENUM_ENTRY) {
+            val enumClassSymbol = symbolProvider.getClassLikeSymbolByFqName(classSymbol.classId.outerClassId!!)!!
+            return resultType.resolvedTypeFromPrototype(
+                enumClassSymbol.constructType(emptyArray(), false)
+            )
         }
     }
     // TODO: Handle no value type here
@@ -270,6 +256,24 @@ fun BodyResolveComponents.typeForQualifier(resolvedQualifier: FirResolvedQualifi
     )
 }
 
+internal fun typeForQualifierByDeclaration(declaration: FirDeclaration, resultType: FirTypeRef): FirTypeRef? {
+    if (declaration is FirRegularClass) {
+        if (declaration.classKind == ClassKind.OBJECT) {
+            return resultType.resolvedTypeFromPrototype(
+                declaration.symbol.constructType(emptyArray(), false)
+            )
+        } else {
+            val companionObject = declaration.companionObject
+            if (companionObject != null) {
+                return resultType.resolvedTypeFromPrototype(
+                    companionObject.symbol.constructType(emptyArray(), false)
+                )
+            }
+        }
+    }
+    return null
+}
+
 fun <T : FirResolvable> BodyResolveComponents.typeFromCallee(access: T): FirResolvedTypeRef {
     val makeNullable: Boolean by lazy {
         if (access is FirQualifiedAccess && access.safe) {

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/SupertypeUtils.kt

@@ -52,8 +52,12 @@ val USE_SITE = scopeSessionKey<FirScope>()
 data class SubstitutionScopeKey(val type: ConeClassLikeType) : ScopeSessionKey<FirClassSubstitutionScope>() {}
 
 fun FirRegularClass.buildUseSiteMemberScope(useSiteSession: FirSession, builder: ScopeSession): FirScope? {
+    if (classId.isLocal) {
+        // It's not possible to find local class by symbol
+        return buildDefaultUseSiteMemberScope(useSiteSession, builder)
+    }
     val symbolProvider = useSiteSession.firSymbolProvider
-    return symbolProvider.getClassUseSiteMemberScope(this.classId, useSiteSession, builder)
+    return symbolProvider.getClassUseSiteMemberScope(classId, useSiteSession, builder)
 }
 
 fun FirTypeAlias.buildUseSiteMemberScope(useSiteSession: FirSession, builder: ScopeSession): FirScope? {

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/FirReceivers.kt

@@ -13,6 +13,7 @@ import org.jetbrains.kotlin.fir.references.impl.FirImplicitThisReference
 import org.jetbrains.kotlin.fir.renderWithType
 import org.jetbrains.kotlin.fir.resolve.FirSymbolProvider
 import org.jetbrains.kotlin.fir.resolve.ScopeSession
+import org.jetbrains.kotlin.fir.resolve.buildDefaultUseSiteMemberScope
 import org.jetbrains.kotlin.fir.resolve.scope
 import org.jetbrains.kotlin.fir.scopes.FirScope
 import org.jetbrains.kotlin.fir.symbols.AbstractFirBasedSymbol
@@ -92,7 +93,12 @@ class ImplicitDispatchReceiverValue(
     scopeSession: ScopeSession
 ) : ImplicitReceiverValue<FirClassSymbol>(boundSymbol, type, useSiteSession, scopeSession) {
     val implicitCompanionScope: FirScope? = boundSymbol.fir.companionObject?.let { companionObject ->
-        symbolProvider.getClassUseSiteMemberScope(companionObject.classId, useSiteSession, scopeSession)
+        val companionId = companionObject.classId
+        if (companionId.isLocal) {
+            companionObject.buildDefaultUseSiteMemberScope(useSiteSession, scopeSession)
+        } else {
+            symbolProvider.getClassUseSiteMemberScope(companionId, useSiteSession, scopeSession)
+        }
     }
 }
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/impl/FirProviderImpl.kt

@@ -136,8 +136,11 @@ class FirProviderImpl(val session: FirSession) : FirProvider() {
         return state.fileMap[fqName].orEmpty()
     }
 
-    override fun getFirClassifierByFqName(fqName: ClassId): FirClassLikeDeclaration<*>? {
-        return state.classifierMap[fqName]
+    override fun getFirClassifierByFqName(classId: ClassId): FirClassLikeDeclaration<*>? {
+        require(!classId.isLocal) {
+            "Local $classId should never be used to find its corresponding classifier"
+        }
+        return state.classifierMap[classId]
     }
 
     @TestOnly

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/FirDeclarationsResolveTransformer.kt

@@ -134,6 +134,7 @@ class FirDeclarationsResolveTransformer(transformer: FirBodyResolveTransformer)
     }
 
     override fun transformRegularClass(regularClass: FirRegularClass, data: Any?): CompositeTransformResult<FirStatement> {
+        localScopes.lastOrNull()?.storeDeclaration(regularClass)
         val oldConstructorScope = primaryConstructorParametersScope
         primaryConstructorParametersScope = null
         val type = regularClass.defaultType()

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirLocalScope.kt

@@ -9,21 +9,20 @@ import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.NAME_FOR_BACKING_FIELD
 import org.jetbrains.kotlin.fir.scopes.FirScope
 import org.jetbrains.kotlin.fir.scopes.ProcessorAction
-import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
-import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
-import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
-import org.jetbrains.kotlin.fir.symbols.impl.FirVariableSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.*
 import org.jetbrains.kotlin.name.Name
 
 class FirLocalScope : FirScope() {
 
     val properties = mutableMapOf<Name, FirVariableSymbol<*>>()
     val functions = mutableMapOf<Name, FirFunctionSymbol<*>>()
+    val classes = mutableMapOf<Name, FirClassSymbol>()
 
     fun storeDeclaration(declaration: FirNamedDeclaration) {
         when (declaration) {
             is FirVariable<*> -> properties[declaration.name] = declaration.symbol
             is FirSimpleFunction -> functions[declaration.name] = declaration.symbol as FirNamedFunctionSymbol
+            is FirRegularClass -> classes[declaration.name] = declaration.symbol
         }
     }
 
@@ -32,17 +31,25 @@ class FirLocalScope : FirScope() {
     }
 
     override fun processFunctionsByName(name: Name, processor: (FirFunctionSymbol<*>) -> ProcessorAction): ProcessorAction {
-        val prop = functions[name]
-        if (prop != null) {
-            return processor(prop)
+        val function = functions[name]
+        if (function != null) {
+            return processor(function)
         }
         return ProcessorAction.NONE
     }
 
     override fun processPropertiesByName(name: Name, processor: (FirCallableSymbol<*>) -> ProcessorAction): ProcessorAction {
-        val prop = properties[name]
-        if (prop != null) {
-            return processor(prop)
+        val property = properties[name]
+        if (property != null) {
+            return processor(property)
+        }
+        return ProcessorAction.NONE
+    }
+
+    override fun processClassifiersByName(name: Name, processor: (FirClassifierSymbol<*>) -> ProcessorAction): ProcessorAction {
+        val klass = classes[name]
+        if (klass != null) {
+            return processor(klass)
         }
         return ProcessorAction.NONE
     }

compiler/fir/resolve/testData/resolve/expresssions/localConstructor.kt

@@ -0,0 +1,5 @@
+fun test() {
+    class Local
+
+    val l = Local()
+}

compiler/fir/resolve/testData/resolve/expresssions/localConstructor.txt

@@ -0,0 +1,11 @@
+FILE: localConstructor.kt
+    public final fun test(): R|kotlin/Unit| {
+        local final class Local : R|kotlin/Any| {
+            public constructor(): R|Local| {
+                super<R|kotlin/Any|>()
+            }
+
+        }
+
+        lval l: R|Local| = R|/Local.Local|()
+    }

compiler/fir/resolve/testData/resolve/stdlib/problems.txt

@@ -24,7 +24,7 @@ FILE: problems.kt
 
         }
 
-        <Unresolved name: Local>#()
+        R|/Local.Local|()
     }
     public final val R|kotlin/Any|.bar: R|kotlin/String|
         public get(): R|kotlin/String| {

compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirResolveTestCaseGenerated.java

@@ -326,6 +326,11 @@ public class FirResolveTestCaseGenerated extends AbstractFirResolveTestCase {
             runTest("compiler/fir/resolve/testData/resolve/expresssions/lambda.kt");
         }
 
+        @TestMetadata("localConstructor.kt")
+        public void testLocalConstructor() throws Exception {
+            runTest("compiler/fir/resolve/testData/resolve/expresssions/localConstructor.kt");
+        }
+
         @TestMetadata("localExtension.kt")
         public void testLocalExtension() throws Exception {
             runTest("compiler/fir/resolve/testData/resolve/expresssions/localExtension.kt");

compiler/testData/ir/irText/declarations/localClassWithOverrides.fir.txt

@@ -3,7 +3,7 @@ FILE fqName:<root> fileName:/localClassWithOverrides.kt
     BLOCK_BODY
       CLASS CLASS name:ALocal modality:ABSTRACT visibility:local superTypes:[kotlin.Any]
         $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.outer.ALocal
-        CONSTRUCTOR visibility:public <> () returnType:IrErrorType [primary]
+        CONSTRUCTOR visibility:public <> () returnType:<root>.outer.ALocal [primary]
           BLOCK_BODY
             DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
             INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:ALocal modality:ABSTRACT visibility:local superTypes:[kotlin.Any]'
@@ -21,11 +21,24 @@ FILE fqName:<root> fileName:/localClassWithOverrides.kt
             correspondingProperty: PROPERTY name:avar visibility:public modality:ABSTRACT [var]
             $this: VALUE_PARAMETER name:<this> type:<root>.outer.ALocal
             VALUE_PARAMETER name:<set-?> index:0 type:kotlin.Int
+        FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean
+          overridden:
+            public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+          VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+        FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int
+          overridden:
+            public open fun hashCode (): kotlin.Int declared in kotlin.Any
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+        FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String
+          overridden:
+            public open fun toString (): kotlin.String declared in kotlin.Any
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Any
       CLASS CLASS name:Local modality:FINAL visibility:local superTypes:[IrErrorType]
         $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.outer.Local
-        CONSTRUCTOR visibility:public <> () returnType:IrErrorType [primary]
+        CONSTRUCTOR visibility:public <> () returnType:<root>.outer.Local [primary]
           BLOCK_BODY
-            ERROR_CALL 'Cannot find delegated constructor call' type=IrErrorType
+            ERROR_CALL 'Cannot find delegated constructor call' type=<root>.outer.Local
             INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Local modality:FINAL visibility:local superTypes:[IrErrorType]'
         FUN name:afun visibility:public modality:FINAL <> ($this:<root>.outer.Local) returnType:kotlin.Unit
           $this: VALUE_PARAMETER name:<this> type:<root>.outer.Local

idea/idea-analysis/src/org/jetbrains/kotlin/idea/fir/IdeFirProvider.kt

@@ -33,18 +33,18 @@ class IdeFirProvider(
     // TODO: invalidation?
     private val files = mutableMapOf<KtFile, FirFile>()
 
-    override fun getFirClassifierByFqName(fqName: ClassId): FirClassLikeDeclaration<*>? {
-        return cacheProvider.getFirClassifierByFqName(fqName) ?: run {
+    override fun getFirClassifierByFqName(classId: ClassId): FirClassLikeDeclaration<*>? {
+        return cacheProvider.getFirClassifierByFqName(classId) ?: run {
 
-            val classes = KotlinFullClassNameIndex.getInstance().get(fqName.asSingleFqName().asString(), project, scope)
+            val classes = KotlinFullClassNameIndex.getInstance().get(classId.asSingleFqName().asString(), project, scope)
             val ktClass = classes.firstOrNull {
-                fqName.packageFqName == it.containingKtFile.packageFqName
+                classId.packageFqName == it.containingKtFile.packageFqName
             } ?: return null // TODO: what if two of them?
             val ktFile = ktClass.containingKtFile
 
             getOrBuildFile(ktFile)
 
-            cacheProvider.getFirClassifierByFqName(fqName)
+            cacheProvider.getFirClassifierByFqName(classId)
         }
     }