K2: drop TypeParameterAsCallable check for reified in ::class

Related to KT-63377

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/resolver/candidateInfoProviders.kt

@@ -48,6 +48,7 @@ abstract class AbstractCandidateInfoProvider(
             containingDeclarations = emptyList(), // TODO - maybe we should pass declarations from context here (no visible differences atm)
             containingFile = firFile,
             isImplicitInvoke = false,
+            isUsedAsGetClassReceiver = false,
             session = firSession,
         )
     }

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

@@ -143,8 +143,10 @@ class FirCallResolver(
     ): List<OverloadCandidate> {
         val collector = AllCandidatesCollector(components, components.resolutionStageRunner)
         val origin = (qualifiedAccess as? FirFunctionCall)?.origin ?: FirFunctionCallOrigin.Regular
-        val result =
+        val result = collectCandidates(
-            collectCandidates(qualifiedAccess, name, forceCallKind = null, origin, containingDeclarations, resolutionContext, collector)
+            qualifiedAccess, name, forceCallKind = null, isUsedAsGetClassReceiver = false,
+            origin, containingDeclarations, resolutionContext, collector
+        )
         return collector.allCandidates.map { OverloadCandidate(it, isInBestCandidates = it in result.candidates) }
     }
 
@@ -152,6 +154,7 @@ class FirCallResolver(
         qualifiedAccess: FirQualifiedAccessExpression,
         name: Name,
         forceCallKind: CallKind? = null,
+        isUsedAsGetClassReceiver: Boolean = false,
         origin: FirFunctionCallOrigin = FirFunctionCallOrigin.Regular,
         containingDeclarations: List<FirDeclaration> = transformer.components.containingDeclarations,
         resolutionContext: ResolutionContext = transformer.resolutionContext,
@@ -169,6 +172,7 @@ class FirCallResolver(
             explicitReceiver,
             argumentList,
             isImplicitInvoke = qualifiedAccess is FirImplicitInvokeCall,
+            isUsedAsGetClassReceiver = isUsedAsGetClassReceiver,
             typeArguments,
             session,
             components.file,
@@ -222,25 +226,17 @@ class FirCallResolver(
     fun resolveVariableAccessAndSelectCandidate(
         qualifiedAccess: FirQualifiedAccessExpression,
         isUsedAsReceiver: Boolean,
+        isUsedAsGetClassReceiver: Boolean,
         callSite: FirElement,
     ): FirStatement {
-        return resolveVariableAccessAndSelectCandidateImpl(qualifiedAccess, isUsedAsReceiver, callSite) { true }
+        return resolveVariableAccessAndSelectCandidateImpl(qualifiedAccess, isUsedAsReceiver, isUsedAsGetClassReceiver, callSite) { true }
-    }
-
-    fun resolveOnlyEnumOrQualifierAccessAndSelectCandidate(
-        qualifiedAccess: FirQualifiedAccessExpression,
-        isUsedAsReceiver: Boolean,
-    ): FirStatement {
-        return resolveVariableAccessAndSelectCandidateImpl(qualifiedAccess, isUsedAsReceiver) accept@{ candidates ->
-            val symbol = candidates.singleOrNull()?.symbol ?: return@accept false
-            symbol is FirEnumEntrySymbol || symbol is FirRegularClassSymbol
-        }
     }
 
     private fun resolveVariableAccessAndSelectCandidateImpl(
         qualifiedAccess: FirQualifiedAccessExpression,
         isUsedAsReceiver: Boolean,
-        callSite: FirElement = qualifiedAccess,
+        isUsedAsGetClassReceiver: Boolean,
+        callSite: FirElement,
         acceptCandidates: (Collection<Candidate>) -> Boolean,
     ): FirStatement {
         val callee = qualifiedAccess.calleeReference as? FirSimpleNamedReference ?: return qualifiedAccess
@@ -250,7 +246,7 @@ class FirCallResolver(
         val nonFatalDiagnosticFromExpression = (qualifiedAccess as? FirPropertyAccessExpression)?.nonFatalDiagnostics
 
         val basicResult by lazy(LazyThreadSafetyMode.NONE) {
-            collectCandidates(qualifiedAccess, callee.name, callSite = callSite)
+            collectCandidates(qualifiedAccess, callee.name, isUsedAsGetClassReceiver = isUsedAsGetClassReceiver, callSite = callSite)
         }
 
         // Even if it's not receiver, it makes sense to continue qualifier if resolution is unsuccessful
@@ -487,6 +483,7 @@ class FirCallResolver(
             explicitReceiver = null,
             delegatedConstructorCall.argumentList,
             isImplicitInvoke = false,
+            isUsedAsGetClassReceiver = false,
             typeArguments = typeArguments,
             session,
             components.file,
@@ -622,6 +619,7 @@ class FirCallResolver(
         explicitReceiver = null,
         annotation.argumentList,
         isImplicitInvoke = false,
+        isUsedAsGetClassReceiver = false,
         typeArguments = annotation.typeArguments,
         session,
         components.file,
@@ -695,6 +693,7 @@ class FirCallResolver(
             callableReferenceAccess.explicitReceiver,
             FirEmptyArgumentList,
             isImplicitInvoke = false,
+            isUsedAsGetClassReceiver = false,
             emptyList(),
             session,
             components.file,

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

@@ -28,6 +28,7 @@ data class CallInfo(
     override val explicitReceiver: FirExpression?,
     override val argumentList: FirArgumentList,
     override val isImplicitInvoke: Boolean,
+    val isUsedAsGetClassReceiver: Boolean,
 
     val typeArguments: List<FirTypeProjection>,
     val session: FirSession,

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

@@ -783,7 +783,8 @@ internal object ConstraintSystemForks : ResolutionStage() {
 
 internal object TypeParameterAsCallable : ResolutionStage() {
     override suspend fun check(candidate: Candidate, callInfo: CallInfo, sink: CheckerSink, context: ResolutionContext) {
-        if (candidate.symbol is FirTypeParameterSymbol) {
+        val symbol = candidate.symbol
+        if (symbol is FirTypeParameterSymbol && !(callInfo.isUsedAsGetClassReceiver && symbol.isReified)) {
             sink.yieldDiagnostic(TypeParameterAsExpression)
         }
     }

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

@@ -374,6 +374,7 @@ class FirSyntheticCallGenerator(
         explicitReceiver = null,
         argumentList = argumentList,
         isImplicitInvoke = false,
+        isUsedAsGetClassReceiver = false,
         typeArguments = emptyList(),
         session = session,
         containingFile = components.file,

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

@@ -12,7 +12,6 @@ import org.jetbrains.kotlin.fakeElement
 import org.jetbrains.kotlin.fir.*
 import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.declarations.utils.isExternal
-import org.jetbrains.kotlin.fir.declarations.utils.isInner
 import org.jetbrains.kotlin.fir.declarations.utils.isLocal
 import org.jetbrains.kotlin.fir.diagnostics.*
 import org.jetbrains.kotlin.fir.expressions.*
@@ -91,13 +90,14 @@ open class FirExpressionsResolveTransformer(transformer: FirAbstractBodyResolveT
         qualifiedAccessExpression: FirQualifiedAccessExpression,
         data: ResolutionMode,
     ): FirStatement = whileAnalysing(session, qualifiedAccessExpression) {
-        transformQualifiedAccessExpression(qualifiedAccessExpression, data, isUsedAsReceiver = false)
+        transformQualifiedAccessExpression(qualifiedAccessExpression, data, isUsedAsReceiver = false, isUsedAsGetClassReceiver = false)
     }
 
     fun transformQualifiedAccessExpression(
         qualifiedAccessExpression: FirQualifiedAccessExpression,
         data: ResolutionMode,
         isUsedAsReceiver: Boolean,
+        isUsedAsGetClassReceiver: Boolean,
     ): FirStatement {
         if (qualifiedAccessExpression.isResolved && qualifiedAccessExpression.calleeReference !is FirSimpleNamedReference) {
             return qualifiedAccessExpression
@@ -152,6 +152,7 @@ open class FirExpressionsResolveTransformer(transformer: FirAbstractBodyResolveT
                 val transformedCallee = resolveQualifiedAccessAndSelectCandidate(
                     qualifiedAccessExpression,
                     isUsedAsReceiver,
+                    isUsedAsGetClassReceiver,
                     // Set the correct call site. For assignment LHSs, it's the assignment, otherwise it's the qualified access itself.
                     callSite = when (data) {
                         is ResolutionMode.AssignmentLValue -> data.variableAssignment
@@ -202,7 +203,7 @@ open class FirExpressionsResolveTransformer(transformer: FirAbstractBodyResolveT
         if (explicitReceiver is FirPropertyAccessExpression) {
             qualifiedAccessExpression.replaceExplicitReceiver(
                 transformQualifiedAccessExpression(
-                    explicitReceiver, ResolutionMode.ReceiverResolution, isUsedAsReceiver = true
+                    explicitReceiver, ResolutionMode.ReceiverResolution, isUsedAsReceiver = true, isUsedAsGetClassReceiver = false
                 ) as FirExpression
             )
             return qualifiedAccessExpression
@@ -221,9 +222,12 @@ open class FirExpressionsResolveTransformer(transformer: FirAbstractBodyResolveT
     protected open fun resolveQualifiedAccessAndSelectCandidate(
         qualifiedAccessExpression: FirQualifiedAccessExpression,
         isUsedAsReceiver: Boolean,
+        isUsedAsGetClassReceiver: Boolean,
         callSite: FirElement,
     ): FirStatement {
-        return callResolver.resolveVariableAccessAndSelectCandidate(qualifiedAccessExpression, isUsedAsReceiver, callSite)
+        return callResolver.resolveVariableAccessAndSelectCandidate(
+            qualifiedAccessExpression, isUsedAsReceiver, isUsedAsGetClassReceiver, callSite
+        )
     }
 
     fun transformSuperReceiver(
@@ -1055,7 +1059,7 @@ open class FirExpressionsResolveTransformer(transformer: FirAbstractBodyResolveT
         val transformedLHS = when (explicitReceiver) {
             is FirPropertyAccessExpression ->
                 transformQualifiedAccessExpression(
-                    explicitReceiver, ResolutionMode.ContextIndependent, isUsedAsReceiver = true
+                    explicitReceiver, ResolutionMode.ContextIndependent, isUsedAsReceiver = true, isUsedAsGetClassReceiver = false
                 ) as FirExpression
             else ->
                 explicitReceiver?.transformSingle(this, ResolutionMode.ContextIndependent)
@@ -1096,7 +1100,9 @@ open class FirExpressionsResolveTransformer(transformer: FirAbstractBodyResolveT
             val argument = getClassCall.argument
             val replacedArgument: FirExpression =
                 if (argument is FirPropertyAccessExpression)
-                    transformQualifiedAccessExpression(argument, dataForLhs, isUsedAsReceiver = true) as FirExpression
+                    transformQualifiedAccessExpression(
+                        argument, dataForLhs, isUsedAsReceiver = true, isUsedAsGetClassReceiver = true
+                    ) as FirExpression
                 else
                     argument.transform(this, dataForLhs)
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/plugin/AbstractFirSpecificAnnotationResolveTransformer.kt

@@ -189,6 +189,7 @@ abstract class AbstractFirSpecificAnnotationResolveTransformer(
         override fun resolveQualifiedAccessAndSelectCandidate(
             qualifiedAccessExpression: FirQualifiedAccessExpression,
             isUsedAsReceiver: Boolean,
+            isUsedAsGetClassReceiver: Boolean,
             callSite: FirElement
         ): FirStatement {
             qualifiedAccessExpression.resolveFromImportScope()

compiler/testData/diagnostics/tests/typeParameters/memberTypeParameterVsNestedClass2.fir.txt

@@ -12,7 +12,7 @@ FILE: memberTypeParameterVsNestedClass2.fir.kt
         }
 
         public final inline fun <reified T> foo(): R|kotlin/Unit| {
-            <getClass>(Q|Outer.T|)
+            <getClass>(R|T|)
             lval x: R|T?| = Null(null)
             lval y: R|T?| = R|/Outer.T.T<CS errors: /Outer.T.T>#|()
         }