FIR LL: fix searching logic for enum entry

KtEnumEntry, a subtype of KtClass, has been handled by
findNonLocalClass. Since KtEnumEntry doesn't have class id, that util
always throws an error while retrieving class id.

Instead, we should use containing class (i.e., enum class) id.
Also, once the enum class is resolved, we should search for matching
enum entry inside the enum class.

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

@@ -129,6 +129,7 @@ internal class FirModuleResolveStateImpl(
         val searcher = FirDeclarationForCompiledElementSearcher(rootModuleSession.symbolProvider)
 
         return when (ktDeclaration) {
+            is KtEnumEntry -> searcher.findNonLocalEnumEntry(ktDeclaration)
             is KtClassOrObject -> searcher.findNonLocalClass(ktDeclaration)
             is KtConstructor<*> -> searcher.findConstructorOfNonLocalClass(ktDeclaration)
             is KtNamedFunction -> searcher.findNonLocalFunction(ktDeclaration)

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/util/FirDeclarationForCompiledElementSearcher.kt

@@ -6,10 +6,7 @@
 package org.jetbrains.kotlin.analysis.low.level.api.fir.util
 
 import org.jetbrains.kotlin.analysis.low.level.api.fir.api.KtDeclarationAndFirDeclarationEqualityChecker
-import org.jetbrains.kotlin.fir.declarations.FirClassLikeDeclaration
-import org.jetbrains.kotlin.fir.declarations.FirConstructor
-import org.jetbrains.kotlin.fir.declarations.FirFunction
-import org.jetbrains.kotlin.fir.declarations.FirProperty
+import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.resolve.providers.FirSymbolProvider
 import org.jetbrains.kotlin.fir.resolve.providers.getClassDeclaredConstructors
 import org.jetbrains.kotlin.fir.resolve.providers.getClassDeclaredFunctionSymbols
@@ -24,6 +21,20 @@ import org.jetbrains.kotlin.psi.psiUtil.containingClassOrObject
  * Allows to search for FIR declarations by compiled [KtDeclaration]s.
  */
 internal class FirDeclarationForCompiledElementSearcher(private val symbolProvider: FirSymbolProvider) {
+
+    fun findNonLocalEnumEntry(declaration: KtEnumEntry): FirEnumEntry {
+        require(!declaration.isLocal)
+        val classId = declaration.containingClassOrObject?.getClassId()
+            ?: error("Non-local class should have classId. The class is ${declaration.getElementTextInContext()}")
+
+        val classCandidate = symbolProvider.getClassLikeSymbolByClassId(classId)
+            ?: error("We should be able to find a symbol for $classId")
+
+        return (classCandidate.fir as? FirRegularClass)?.declarations?.first {
+            it is FirEnumEntry && it.name == declaration.nameAsName
+        } as FirEnumEntry
+    }
+
     fun findNonLocalClass(declaration: KtClassOrObject): FirClassLikeDeclaration {
         require(!declaration.isLocal)
         val classId = declaration.getClassId()

analysis/low-level-api-fir/testdata/getOrBuildFir/annotations/retentionValue.kt

@@ -0,0 +1,2 @@
+@Retention(AnnotationRetention.<expr>SOURCE</expr>)
+annotation class Anno

analysis/low-level-api-fir/testdata/getOrBuildFir/annotations/retentionValue.txt

@@ -0,0 +1,5 @@
+KT element: KtNameReferenceExpression
+FIR element: FirResolvedNamedReferenceImpl
+
+FIR element rendered:
+R|kotlin/annotation/AnnotationRetention.SOURCE|

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/GetOrBuildFirTestGenerated.java

@@ -68,6 +68,12 @@ public class GetOrBuildFirTestGenerated extends AbstractGetOrBuildFirTest {
         public void testFileAnnotation() throws Exception {
             runTest("analysis/low-level-api-fir/testdata/getOrBuildFir/annotations/fileAnnotation.kt");
         }
+
+        @Test
+        @TestMetadata("retentionValue.kt")
+        public void testRetentionValue() throws Exception {
+            runTest("analysis/low-level-api-fir/testdata/getOrBuildFir/annotations/retentionValue.kt");
+        }
     }
 
     @Nested