commit a704dc1bd454b42c73de63111e0e19d1cb9b97b1
author Ilya Kirillov <ilya.kirillov@jetbrains.com> Tue Jan 18 12:23:56 2022 +0300
committer Ilya Kirillov <ilya.kirillov@jetbrains.com> Thu Jan 20 19:12:06 2022 +0100
tree deed0a0fca3045c14589e295b1f5e9a0ef9dafc6
parent b22190ccc1534d34d9e27e58d982148838267d9f

FIR: make transformInplace to be thread safe if no transformation was done

^KT-50822 fixed

compiler/fir/tree/src/org/jetbrains/kotlin/fir/visitors/FirTransformerUtil.kt

diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/visitors/FirTransformerUtil.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/visitors/FirTransformerUtil.kt
index cb5f3b9..fcd1d9e 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/visitors/FirTransformerUtil.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/visitors/FirTransformerUtil.kt
@@ -17,7 +17,9 @@
     while (iterator.hasNext()) {
         val next = iterator.next() as FirPureAbstractElement
         val result = next.transform<T, D>(transformer, data)
-        iterator.set(result)
+        if (result !== next) {
+            iterator.set(result)
+        }
     }
 }
 
@@ -36,7 +38,9 @@
             TransformData.Nothing -> continue
         }
         val result = next.transform<T, D>(transformer, data)
-        iterator.set(result)
+        if (result !== next) {
+            iterator.set(result)
+        }
     }
 }