From d20e5ce673ff0e35373bfed370565e1e765bcbb5 Mon Sep 17 00:00:00 2001
From: Denis Zharkov <denis.zharkov@jetbrains.com>
Date: Fri, 20 Jul 2018 16:27:08 +0300
Subject: [PATCH] Cache hashCode for DataFlowValue in another field

It's necessary because DataFlowValue instances are commonly
used as keys in maps

 #KT-24657 Fixed
---
 .../resolve/calls/smartcasts/DataFlowValue.kt       | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/smartcasts/DataFlowValue.kt b/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/smartcasts/DataFlowValue.kt
index 74aa99fe02c..ac3c8350d9d 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/smartcasts/DataFlowValue.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/smartcasts/DataFlowValue.kt
@@ -90,7 +90,18 @@ class DataFlowValue(
 
     override fun toString() = "$kind $identifierInfo $immanentNullability"
 
-    override fun hashCode() = type.hashCode() + 31 * identifierInfo.hashCode()
+    private var hashCode = 0
+
+    override fun hashCode(): Int {
+        var hashCode = hashCode
+
+        if (hashCode == 0) {
+            hashCode = type.hashCode() + 31 * identifierInfo.hashCode()
+            this.hashCode = hashCode
+        }
+
+        return hashCode
+    }
 
     companion object {