From 03afc1f2d8be05fa4ffe953cd94670fcdd311db3 Mon Sep 17 00:00:00 2001
From: Mikhail Glukhikh <Mikhail.Glukhikh@jetbrains.com>
Date: Thu, 15 Dec 2022 15:30:40 +0100
Subject: [PATCH] K2: don't create so large arrays in each CFGNode

---
 .../src/org/jetbrains/kotlin/fir/resolve/dfa/cfg/CFGNode.kt  | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/dfa/cfg/CFGNode.kt b/compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/dfa/cfg/CFGNode.kt
index 82a3c44ce4c..126d9a95e81 100644
--- a/compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/dfa/cfg/CFGNode.kt
+++ b/compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/dfa/cfg/CFGNode.kt
@@ -15,6 +15,7 @@ import org.jetbrains.kotlin.fir.resolve.dfa.PersistentFlow
 import org.jetbrains.kotlin.fir.resolve.dfa.controlFlowGraph
 import org.jetbrains.kotlin.fir.visitors.FirTransformer
 import org.jetbrains.kotlin.fir.visitors.FirVisitor
+import org.jetbrains.kotlin.utils.SmartList
 import org.jetbrains.kotlin.utils.addToStdlib.runIf
 
 @RequiresOptIn
@@ -112,8 +113,8 @@ sealed class CFGNode<out E : FirElement>(val owner: ControlFlowGraph, val level:
         owner.addNode(this)
     }
 
-    private val _previousNodes: MutableList<CFGNode<*>> = mutableListOf()
-    private val _followingNodes: MutableList<CFGNode<*>> = mutableListOf()
+    private val _previousNodes: MutableList<CFGNode<*>> = SmartList()
+    private val _followingNodes: MutableList<CFGNode<*>> = SmartList()
 
     val previousNodes: List<CFGNode<*>> get() = _previousNodes
     val followingNodes: List<CFGNode<*>> get() = _followingNodes