From f7d12efc24071bff8273d7a44a3988bc99ed3f06 Mon Sep 17 00:00:00 2001
From: Mikhail Glukhikh <mikhail.glukhikh@jetbrains.com>
Date: Thu, 3 Oct 2019 17:01:49 +0300
Subject: [PATCH] Memoize absent classifier names in FIR star importing scopes

---
 .../fir/scopes/impl/FirAbstractStarImportingScope.kt   | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirAbstractStarImportingScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirAbstractStarImportingScope.kt
index e98995566d6..f8ef4da817a 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirAbstractStarImportingScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirAbstractStarImportingScope.kt
@@ -24,11 +24,17 @@ abstract class FirAbstractStarImportingScope(
 
     protected abstract val starImports: List<FirResolvedImport>
 
+    private val absentClassifierNames = mutableSetOf<Name>()
+
     override fun processClassifiersByName(
         name: Name,
         position: FirPosition,
         processor: (FirClassifierSymbol<*>) -> Boolean
     ): Boolean {
+        if (starImports.isEmpty() || name in absentClassifierNames) {
+            return true
+        }
+        var empty = true
         for (import in starImports) {
             val relativeClassName = import.relativeClassName
             val classId = when {
@@ -37,10 +43,14 @@ abstract class FirAbstractStarImportingScope(
                 else -> ClassId(import.packageFqName, relativeClassName.child(name), false)
             }
             val symbol = provider.getClassLikeSymbolByFqName(classId) ?: continue
+            empty = false
             if (!processor(symbol)) {
                 return false
             }
         }
+        if (empty) {
+            absentClassifierNames += name
+        }
         return true
     }