From 988226a90e91e9a6998e8c687749cf5011bf69d1 Mon Sep 17 00:00:00 2001
From: Alexander Udalov <alexander.udalov@jetbrains.com>
Date: Mon, 15 Jun 2020 21:44:55 +0200
Subject: [PATCH] IR: optimize FqNameEqualityChecker.checkViaDeclarations

---
 .../ir/symbols/IrClassifierEqualityChecker.kt      | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrClassifierEqualityChecker.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrClassifierEqualityChecker.kt
index 42afadb8437..9b8e16bdda0 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrClassifierEqualityChecker.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrClassifierEqualityChecker.kt
@@ -59,12 +59,24 @@ object FqNameEqualityChecker : IrClassifierEqualityChecker {
             return parentFqName?.child(name)
         }
 
+    private fun areFqNamesEqual(c1: IrDeclarationWithName, c2: IrDeclarationWithName): Boolean {
+        if (c1.name != c2.name) return false
+
+        val parent1 = c1.parent
+        val parent2 = c2.parent
+        return when (parent1) {
+            is IrPackageFragment -> parent2 is IrPackageFragment && parent1.fqName == parent2.fqName
+            is IrDeclarationWithName -> parent2 is IrDeclarationWithName && areFqNamesEqual(parent1, parent2)
+            else -> false
+        }
+    }
+
     private fun checkViaDeclarations(c1: IrSymbolOwner, c2: IrSymbolOwner): Boolean {
         if (c1 is IrClass && c2 is IrClass) {
             if (c1.isLocalClass() || c2.isLocalClass())
                 return c1 === c2 // Local declarations should be identical
 
-            return c1.fqName == c2.fqName
+            return areFqNamesEqual(c1, c2)
         }
 
         return c1 == c2