Use FirNamedFunctionSymbol in FirSimpleFunction & its inheritors

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/FirHelpers.kt

@@ -200,7 +200,6 @@ fun FirSimpleFunction.overriddenFunctions(
     containingClass: FirClass<*>,
     context: CheckerContext
 ): List<FirFunctionSymbol<*>> {
-    val symbol = symbol as? FirNamedFunctionSymbol ?: return emptyList()
     val firTypeScope = containingClass.unsubstitutedScope(
         context.sessionHolder.session,
         context.sessionHolder.scopeSession,

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirTypeMismatchOnOverrideChecker.kt

@@ -51,7 +51,7 @@ object FirTypeMismatchOnOverrideChecker : FirRegularClassChecker() {
     private fun FirTypeScope.retrieveDirectOverriddenOf(function: FirSimpleFunction): List<FirFunctionSymbol<*>> {
         processFunctionsByName(function.name) {}
 
-        return getDirectOverriddenFunctions(function.symbol as FirNamedFunctionSymbol)
+        return getDirectOverriddenFunctions(function.symbol)
     }
 
     private fun FirTypeScope.retrieveDirectOverriddenOf(property: FirProperty): List<FirPropertySymbol> {

compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/resolve/providers/impl/FirBuiltinSymbolProvider.kt

@@ -233,7 +233,7 @@ class FirBuiltinSymbolProvider(session: FirSession, val kotlinScopeProvider: Kot
         val functionClass = getClassLikeSymbolByFqName(classId(arity)) ?: return null
         val invoke =
             functionClass.fir.declarations.find { it is FirSimpleFunction && it.name == OperatorNameConventions.INVOKE } ?: return null
-        return (invoke as FirSimpleFunction).symbol as? FirNamedFunctionSymbol
+        return (invoke as FirSimpleFunction).symbol
     }
 
     private fun FunctionClassKind.classId(arity: Int) = ClassId(packageFqName, numberedClassName(arity))

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt

@@ -250,7 +250,6 @@ internal fun FirSimpleFunction.generateOverriddenFunctionSymbols(
     val scope = containingClass.unsubstitutedScope(session, scopeSession, withForcedTypeCalculator = true)
     scope.processFunctionsByName(name) {}
     val overriddenSet = mutableSetOf<IrSimpleFunctionSymbol>()
-    val symbol = symbol as? FirNamedFunctionSymbol ?: return emptyList()
     scope.processDirectlyOverriddenFunctions(symbol) {
         if (it.fir.visibility == Visibilities.Private) {
             return@processDirectlyOverriddenFunctions ProcessorAction.NEXT

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/declarations/FirJavaMethod.kt

@@ -17,7 +17,7 @@ import org.jetbrains.kotlin.fir.declarations.builder.FirSimpleFunctionBuilder
 import org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl
 import org.jetbrains.kotlin.fir.expressions.FirAnnotationCall
 import org.jetbrains.kotlin.fir.expressions.FirBlock
-import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.fir.types.jvm.FirJavaTypeRef
@@ -52,7 +52,7 @@ class FirJavaMethod @FirImplementationDetail constructor(
     name: Name,
     status: FirDeclarationStatus,
     containerSource: DeserializedContainerSource?,
-    symbol: FirFunctionSymbol<FirSimpleFunction>,
+    symbol: FirNamedFunctionSymbol,
     annotations: MutableList<FirAnnotationCall>,
     dispatchReceiverType: ConeKotlinType?,
 ) : FirSimpleFunctionImpl(

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

@@ -12,7 +12,6 @@ import org.jetbrains.kotlin.fir.resolve.inference.inferenceComponents
 import org.jetbrains.kotlin.fir.scopes.ProcessorAction
 import org.jetbrains.kotlin.fir.scopes.processOverriddenFunctions
 import org.jetbrains.kotlin.fir.scopes.unsubstitutedScope
-import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.types.ConeInferenceContext
 import org.jetbrains.kotlin.fir.types.ConeTypeCheckerContext
 
@@ -30,7 +29,6 @@ fun FirSimpleFunction.lowestVisibilityAmongOverrides(
     session: FirSession,
     scopeSession: ScopeSession
 ): Visibility {
-    val symbol = symbol as? FirNamedFunctionSymbol ?: return visibility
     val firTypeScope = containingClass.unsubstitutedScope(session, scopeSession, withForcedTypeCalculator = false)
     var visibility = visibility
 

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

@@ -117,7 +117,7 @@ private fun FirTypeAliasSymbol.findSAMConstructorForTypeAlias(
 
     if (type.typeArguments.isEmpty()) return samConstructorForClass
 
-    val namedSymbol = samConstructorForClass.symbol as? FirNamedFunctionSymbol ?: return null
+    val namedSymbol = samConstructorForClass.symbol
 
     val substitutor = prepareSubstitutorForTypeAliasConstructors(
         type,

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirStatusResolver.kt

@@ -75,12 +75,10 @@ class FirStatusResolver(
             buildList<FirCallableMemberDeclaration<*>> {
                 val scope = containingClass.unsubstitutedScope(session, scopeSession, withForcedTypeCalculator = false)
                 val symbol = function.symbol
-                if (symbol is FirNamedFunctionSymbol) {
-                    scope.processFunctionsByName(function.name) {}
-                    scope.processDirectOverriddenFunctionsWithBaseScope(symbol) { overriddenSymbol, _ ->
-                        this += overriddenSymbol.fir
-                        ProcessorAction.NEXT
-                    }
+                scope.processFunctionsByName(function.name) {}
+                scope.processDirectOverriddenFunctionsWithBaseScope(symbol) { overriddenSymbol, _ ->
+                    this += overriddenSymbol.fir
+                    ProcessorAction.NEXT
                 }
             }.mapNotNull {
                 it.status as? FirResolvedDeclarationStatus

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

@@ -64,7 +64,7 @@ class FirDelegatedMemberScope(
                     newModality = Modality.OPEN,
                 ).apply {
                     delegatedWrapperData = DelegatedWrapperData(functionSymbol.fir, containingClass.symbol.toLookupTag(), delegateField)
-                }.symbol as FirNamedFunctionSymbol
+                }.symbol
             }
             processor(delegatedSymbol)
         }

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

@@ -54,7 +54,7 @@ object FirFakeOverrideGenerator {
     }
 
     private fun createSubstitutionOverrideFunction(
-        fakeOverrideSymbol: FirFunctionSymbol<FirSimpleFunction>,
+        fakeOverrideSymbol: FirNamedFunctionSymbol,
         session: FirSession,
         baseFunction: FirSimpleFunction,
         newDispatchReceiverType: ConeKotlinType?,
@@ -85,7 +85,7 @@ object FirFakeOverrideGenerator {
     }
 
     fun createCopyForFirFunction(
-        newSymbol: FirFunctionSymbol<FirSimpleFunction>,
+        newSymbol: FirNamedFunctionSymbol,
         baseFunction: FirSimpleFunction,
         session: FirSession,
         origin: FirDeclarationOrigin,

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

@@ -34,7 +34,7 @@ class FirLocalScope private constructor(
 
     fun storeFunction(function: FirSimpleFunction): FirLocalScope {
         return FirLocalScope(
-            properties, functions.put(function.name, function.symbol as FirNamedFunctionSymbol), classes
+            properties, functions.put(function.name, function.symbol), classes
         )
     }
 

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/FirSimpleFunction.kt

@@ -12,7 +12,7 @@ import org.jetbrains.kotlin.fir.contracts.FirContractDescription
 import org.jetbrains.kotlin.fir.expressions.FirAnnotationCall
 import org.jetbrains.kotlin.fir.expressions.FirBlock
 import org.jetbrains.kotlin.fir.references.FirControlFlowGraphReference
-import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.name.Name
@@ -40,7 +40,7 @@ abstract class FirSimpleFunction : FirPureAbstractElement(), FirFunction<FirSimp
     abstract override val dispatchReceiverType: ConeKotlinType?
     abstract override val contractDescription: FirContractDescription
     abstract val name: Name
-    abstract override val symbol: FirFunctionSymbol<FirSimpleFunction>
+    abstract override val symbol: FirNamedFunctionSymbol
     abstract override val annotations: List<FirAnnotationCall>
     abstract override val typeParameters: List<FirTypeParameter>
 

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/builder/FirSimpleFunctionBuilder.kt

@@ -26,7 +26,7 @@ import org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl
 import org.jetbrains.kotlin.fir.expressions.FirAnnotationCall
 import org.jetbrains.kotlin.fir.expressions.FirBlock
 import org.jetbrains.kotlin.fir.references.FirControlFlowGraphReference
-import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.fir.visitors.*
@@ -54,7 +54,7 @@ open class FirSimpleFunctionBuilder : FirFunctionBuilder, FirTypeParametersOwner
     open var dispatchReceiverType: ConeKotlinType? = null
     open var contractDescription: FirContractDescription = FirEmptyContractDescription
     open lateinit var name: Name
-    open lateinit var symbol: FirFunctionSymbol<FirSimpleFunction>
+    open lateinit var symbol: FirNamedFunctionSymbol
     override val annotations: MutableList<FirAnnotationCall> = mutableListOf()
     override val typeParameters: MutableList<FirTypeParameter> = mutableListOf()
 

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/impl/FirSimpleFunctionImpl.kt

@@ -19,7 +19,7 @@ import org.jetbrains.kotlin.fir.declarations.FirValueParameter
 import org.jetbrains.kotlin.fir.expressions.FirAnnotationCall
 import org.jetbrains.kotlin.fir.expressions.FirBlock
 import org.jetbrains.kotlin.fir.references.FirControlFlowGraphReference
-import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.name.Name
@@ -46,7 +46,7 @@ open class FirSimpleFunctionImpl @FirImplementationDetail constructor(
     override val dispatchReceiverType: ConeKotlinType?,
     override var contractDescription: FirContractDescription,
     override val name: Name,
-    override val symbol: FirFunctionSymbol<FirSimpleFunction>,
+    override val symbol: FirNamedFunctionSymbol,
     override val annotations: MutableList<FirAnnotationCall>,
     override val typeParameters: MutableList<FirTypeParameter>,
 ) : FirSimpleFunction() {

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/NodeConfigurator.kt

@@ -299,7 +299,7 @@ object NodeConfigurator : AbstractFieldConfigurator<FirTreeBuilder>(FirTreeBuild
             parentArg(function, "F", simpleFunction)
             parentArg(callableMemberDeclaration, "F", simpleFunction)
             +name
-            +symbol("FirFunctionSymbol<FirSimpleFunction>")
+            +symbol("FirNamedFunctionSymbol")
             +annotations
             +typeParameters
         }