[FIR] Set actual modifier on implicitly actual primary constructors

... of annotations and inline classes.

#KT-60139 Fixed

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

@@ -10,10 +10,7 @@ import org.jetbrains.kotlin.diagnostics.reportOn
 import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
 import org.jetbrains.kotlin.fir.analysis.checkers.getContainingClassSymbol
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
-import org.jetbrains.kotlin.fir.declarations.FirCallableDeclaration
-import org.jetbrains.kotlin.fir.declarations.FirFunction
-import org.jetbrains.kotlin.fir.declarations.expectForActual
-import org.jetbrains.kotlin.fir.declarations.getSingleExpectForActualOrNull
+import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.declarations.utils.isActual
 import org.jetbrains.kotlin.fir.symbols.FirBasedSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
@@ -32,6 +29,7 @@ object FirActualCallableDeclarationChecker : FirCallableDeclarationChecker() {
     }
 
     private fun checkActualFunctionWithDefaultArguments(function: FirFunction, reporter: DiagnosticReporter, context: CheckerContext) {
+        if (function.symbol.isAnnotationConstructor(context.session)) return
         for (valueParameter in function.valueParameters) {
             if (valueParameter.defaultValue != null) {
                 reporter.reportOn(valueParameter.source, FirErrors.ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS, context)

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

@@ -122,7 +122,6 @@ object FirExpectActualDeclarationChecker : FirBasicDeclarationChecker() {
     ) {
         val symbol = declaration.symbol
         val compatibilityToMembersMap = symbol.expectForActual ?: return
-        val session = context.session
 
         checkAmbiguousExpects(symbol, compatibilityToMembersMap, symbol, context, reporter)
 
@@ -131,7 +130,7 @@ object FirExpectActualDeclarationChecker : FirBasicDeclarationChecker() {
             if (compatibilityToMembersMap.allStrongIncompatibilities()) return
 
             if (Compatible in compatibilityToMembersMap) {
-                if (checkActual && requireActualModifier(symbol, session)) {
+                if (checkActual) {
                     reporter.reportOn(source, FirErrors.ACTUAL_MISSING, context)
                 }
                 return
@@ -168,13 +167,15 @@ object FirExpectActualDeclarationChecker : FirBasicDeclarationChecker() {
             }
 
             Compatible !in compatibilityToMembersMap -> {
-                reporter.reportOn(
-                    source,
-                    FirErrors.ACTUAL_WITHOUT_EXPECT,
-                    symbol,
-                    compatibilityToMembersMap,
-                    context
-                )
+                if (requireActualModifier(declaration.symbol, context.session)) {
+                    reporter.reportOn(
+                        source,
+                        FirErrors.ACTUAL_WITHOUT_EXPECT,
+                        symbol,
+                        compatibilityToMembersMap,
+                        context
+                    )
+                }
             }
 
             else -> {}

compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/converter/LightTreeRawFirDeclarationBuilder.kt

@@ -550,7 +550,8 @@ class LightTreeRawFirDeclarationBuilder(
                         selfType.source,
                         classWrapper,
                         delegatedConstructorSource,
-                        containingClassIsExpectClass = status.isExpect
+                        containingClassIsExpectClass = status.isExpect,
+                        isImplicitlyActual = status.isActual && (status.isInline || classKind == ClassKind.ANNOTATION_CLASS)
                     )
                     val firPrimaryConstructor = primaryConstructorWrapper?.firConstructor
                     firPrimaryConstructor?.let { declarations += it }
@@ -884,7 +885,8 @@ class LightTreeRawFirDeclarationBuilder(
         classWrapper: ClassWrapper,
         delegatedConstructorSource: KtLightSourceElement?,
         isEnumEntry: Boolean = false,
-        containingClassIsExpectClass: Boolean
+        containingClassIsExpectClass: Boolean,
+        isImplicitlyActual: Boolean = false,
     ): PrimaryConstructor? {
         fun ClassKind.isEnumRelated(): Boolean = this == ClassKind.ENUM_CLASS || this == ClassKind.ENUM_ENTRY
         val shouldGenerateImplicitConstructor =
@@ -955,7 +957,7 @@ class LightTreeRawFirDeclarationBuilder(
         }
         val status = FirDeclarationStatusImpl(explicitVisibility ?: defaultVisibility, Modality.FINAL).apply {
             isExpect = modifiers.hasExpect() || context.containerIsExpect
-            isActual = modifiers.hasActual()
+            isActual = modifiers.hasActual() || isImplicitlyActual
             isInner = classWrapper.isInner()
             isFromSealedClass = classWrapper.isSealed() && explicitVisibility !== Visibilities.Private
             isFromEnumClass = classWrapper.isEnum()

compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/PsiRawFirBuilder.kt

@@ -983,6 +983,7 @@ open class PsiRawFirBuilder(
                     containingClassIsExpectClass,
                     copyConstructedTypeRefWithImplicitSource = true,
                     isErrorConstructor = !hasPrimaryConstructor,
+                    isImplicitlyActual = container.status.isActual && (container.status.isInline || classKind == ClassKind.ANNOTATION_CLASS)
                 )
                 container.declarations += firPrimaryConstructor
             }
@@ -1003,6 +1004,7 @@ open class PsiRawFirBuilder(
             containingClassIsExpectClass: Boolean,
             copyConstructedTypeRefWithImplicitSource: Boolean,
             isErrorConstructor: Boolean = false,
+            isImplicitlyActual: Boolean = false,
         ): FirConstructor {
             val constructorSource = this?.toFirSourceElement()
                 ?: owner.toKtPsiSourceElement(KtFakeSourceElementKind.ImplicitConstructor)
@@ -1050,7 +1052,7 @@ open class PsiRawFirBuilder(
             val explicitVisibility = this?.visibility?.takeUnless { it == Visibilities.Unknown }
             val status = FirDeclarationStatusImpl(explicitVisibility ?: defaultVisibility(), Modality.FINAL).apply {
                 isExpect = this@toFirConstructor?.hasExpectModifier() == true || this@PsiRawFirBuilder.context.containerIsExpect
-                isActual = this@toFirConstructor?.hasActualModifier() == true
+                isActual = this@toFirConstructor?.hasActualModifier() == true || isImplicitlyActual
                 isInner = owner.parent.parent !is KtScript && owner.hasModifier(INNER_KEYWORD) // a warning about inner script class is reported on the class itself
                 isFromSealedClass = owner.hasModifier(SEALED_KEYWORD) && explicitVisibility !== Visibilities.Private
                 isFromEnumClass = owner.hasModifier(ENUM_KEYWORD)

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/mpp/FirExpectActualMatcherTransformer.kt

@@ -83,7 +83,7 @@ open class FirExpectActualMatcherTransformer(
     // ------------------------------------------------------
 
     fun transformMemberDeclaration(memberDeclaration: FirMemberDeclaration) {
-        if (!memberDeclaration.isActual && !memberDeclaration.isImplicitlyActual()) return
+        if (!memberDeclaration.isActual) return
         val actualSymbol = memberDeclaration.symbol
 
         // Regardless of whether any `expect` symbols are found for `memberDeclaration`, it must be assigned an `expectForActual` map.
@@ -97,11 +97,4 @@ open class FirExpectActualMatcherTransformer(
         ) ?: mapOf()
         memberDeclaration.expectForActual = expectForActualData
     }
-
-    // TODO KT-60139 Remove special handling when implicitly actual elements have the actual flag set.
-    private fun FirMemberDeclaration.isImplicitlyActual(): Boolean {
-        if (this !is FirPrimaryConstructor) return false
-        val klass = getContainingClass(session) ?: return false
-        return klass.isActual && (klass.isInline || klass.classKind == ClassKind.ANNOTATION_CLASS)
-    }
 }