commit 556885a762c590bea0adade1a5d2bed25046548a
author Søren Gjesse <sgjesse@google.com> Mon Aug 03 09:32:22 2020 +0200
committer Søren Gjesse <sgjesse@google.com> Mon Aug 03 07:50:19 2020 +0000
tree fa371369b9da30704a4d8ac057a5c66e200cb76f
parent f7f75babade8fc06bf0ed9d045f2527058524439

Fix a race when creating the Reference singleton

Bug: 162704041
Change-Id: I964e43f47534ccd5395581213de61a51b4cd5f4b

src/main/java/com/android/tools/r8/references/Reference.java

diff --git a/src/main/java/com/android/tools/r8/references/Reference.java b/src/main/java/com/android/tools/r8/references/Reference.java
index f2c5442..444eee3 100644
--- a/src/main/java/com/android/tools/r8/references/Reference.java
+++ b/src/main/java/com/android/tools/r8/references/Reference.java
@@ -60,7 +60,11 @@
 
   private static Reference getInstance() {
     if (instance == null) {
-      instance = new Reference();
+      synchronized (Reference.class) {
+        if (instance == null) {
+          instance = new Reference();
+        }
+      }
     }
     return instance;
   }