K2 checkers: extract retrieveDirectOverriddenOf to FirTypeScope.kt

compiler/fir/checkers/checkers.native/src/org/jetbrains/kotlin/fir/analysis/native/checkers/FirNativeObjCNameOverridesChecker.kt

@@ -19,8 +19,6 @@ import org.jetbrains.kotlin.fir.isIntersectionOverride
 import org.jetbrains.kotlin.fir.resolve.toFirRegularClassSymbol
 import org.jetbrains.kotlin.fir.scopes.*
 import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
-import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
-import org.jetbrains.kotlin.fir.symbols.impl.FirPropertySymbol
 
 object FirNativeObjCNameOverridesChecker : FirClassChecker() {
 
@@ -44,7 +42,7 @@ object FirNativeObjCNameOverridesChecker : FirClassChecker() {
         context: CheckerContext,
         reporter: DiagnosticReporter
     ) {
-        val overriddenSymbols = firTypeScope.getDirectOverriddenSymbols(memberSymbol)
+        val overriddenSymbols = firTypeScope.retrieveDirectOverriddenOf(memberSymbol)
         if (overriddenSymbols.isEmpty()) return
         val objCNames = overriddenSymbols.map { it.getFirstBaseSymbol(firTypeScope).getObjCNames() }
         if (!objCNames.allNamesEquals()) {
@@ -59,24 +57,8 @@ object FirNativeObjCNameOverridesChecker : FirClassChecker() {
         }
     }
 
-    private fun FirTypeScope.getDirectOverriddenSymbols(memberSymbol: FirCallableSymbol<*>): List<FirCallableSymbol<*>> {
-        return when (memberSymbol) {
-            is FirNamedFunctionSymbol -> {
-                processFunctionsByName(memberSymbol.name) {}
-                getDirectOverriddenFunctions(memberSymbol)
-            }
-
-            is FirPropertySymbol -> {
-                processPropertiesByName(memberSymbol.name) {}
-                getDirectOverriddenProperties(memberSymbol)
-            }
-
-            else -> error("unexpected member kind $memberSymbol")
-        }
-    }
-
     private fun FirCallableSymbol<*>.getFirstBaseSymbol(firTypeScope: FirTypeScope): FirCallableSymbol<*> {
-        val overriddenMemberSymbols = firTypeScope.getDirectOverriddenSymbols(this)
+        val overriddenMemberSymbols = firTypeScope.retrieveDirectOverriddenOf(this)
         return if (overriddenMemberSymbols.isEmpty()) this else overriddenMemberSymbols.first().getFirstBaseSymbol(firTypeScope)
     }
 

compiler/fir/checkers/checkers.native/src/org/jetbrains/kotlin/fir/analysis/native/checkers/FirNativeObjCRefinementOverridesChecker.kt

@@ -25,8 +25,6 @@ import org.jetbrains.kotlin.fir.resolve.toFirRegularClassSymbol
 import org.jetbrains.kotlin.fir.resolve.toSymbol
 import org.jetbrains.kotlin.fir.scopes.*
 import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
-import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
-import org.jetbrains.kotlin.fir.symbols.impl.FirPropertySymbol
 
 object FirNativeObjCRefinementOverridesChecker : FirClassChecker() {
 
@@ -52,7 +50,7 @@ object FirNativeObjCRefinementOverridesChecker : FirClassChecker() {
         objCAnnotations: List<FirAnnotation>,
         swiftAnnotations: List<FirAnnotation>
     ) {
-        val overriddenMemberSymbols = firTypeScope.getDirectOverriddenSymbols(memberSymbol)
+        val overriddenMemberSymbols = firTypeScope.retrieveDirectOverriddenOf(memberSymbol)
         if (overriddenMemberSymbols.isEmpty()) return
         var isHiddenFromObjC = objCAnnotations.isNotEmpty()
         var isRefinedInSwift = swiftAnnotations.isNotEmpty()
@@ -71,27 +69,11 @@ object FirNativeObjCRefinementOverridesChecker : FirClassChecker() {
         }
     }
 
-    private fun FirTypeScope.getDirectOverriddenSymbols(memberSymbol: FirCallableSymbol<*>): List<FirCallableSymbol<*>> {
-        return when (memberSymbol) {
-            is FirNamedFunctionSymbol -> {
-                processFunctionsByName(memberSymbol.name) {}
-                getDirectOverriddenFunctions(memberSymbol)
-            }
-
-            is FirPropertySymbol -> {
-                processPropertiesByName(memberSymbol.name) {}
-                getDirectOverriddenProperties(memberSymbol)
-            }
-
-            else -> error("unexpected member kind $memberSymbol")
-        }
-    }
-
     private fun FirCallableSymbol<*>.inheritsRefinedAnnotations(session: FirSession, firTypeScope: FirTypeScope): Pair<Boolean, Boolean> {
         val (hasObjC, hasSwift) = hasRefinedAnnotations(session)
         if (hasObjC && hasSwift) return true to true
         // Note: `checkMember` requires all overridden symbols to be either refined or not refined.
-        val overriddenMemberSymbol = firTypeScope.getDirectOverriddenSymbols(this).firstOrNull()
+        val overriddenMemberSymbol = firTypeScope.retrieveDirectOverriddenOf(this).firstOrNull()
             ?: return hasObjC to hasSwift
         val (inheritsObjC, inheritsSwift) = overriddenMemberSymbol.inheritsRefinedAnnotations(session, firTypeScope)
         return (hasObjC || inheritsObjC) to (hasSwift || inheritsSwift)

compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirTypeScope.kt

@@ -254,6 +254,22 @@ fun FirTypeScope.getDirectOverriddenProperties(
     return overriddenProperties.toList()
 }
 
+fun FirTypeScope.retrieveDirectOverriddenOf(memberSymbol: FirCallableSymbol<*>): List<FirCallableSymbol<*>> {
+    return when (memberSymbol) {
+        is FirNamedFunctionSymbol -> {
+            processFunctionsByName(memberSymbol.name) {}
+            getDirectOverriddenFunctions(memberSymbol)
+        }
+
+        is FirPropertySymbol -> {
+            processPropertiesByName(memberSymbol.name) {}
+            getDirectOverriddenProperties(memberSymbol)
+        }
+
+        else -> throw IllegalArgumentException("unexpected member kind $memberSymbol")
+    }
+}
+
 private inline fun <reified D : FirCallableSymbol<*>> MutableCollection<D>.addOverridden(
     symbol: D,
     unwrapIntersectionAndSubstitutionOverride: Boolean