# HG changeset patch
# User Stefan Anzinger <stefan.anzinger@oracle.com>
# Date 1430759570 -7200
# Node ID 0028ab94d268ebca7edb4dc6b0416853c0760018
# Parent  9a7125f0eedad9d0f9e20d0c38d6a4cb163541fb
Make cache in HotSpotConstantPool.lookupType thread safe.

diff -r 9a7125f0eeda -r 0028ab94d268 graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotConstantPool.java
--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotConstantPool.java	Mon May 04 09:10:52 2015 +0200
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotConstantPool.java	Mon May 04 19:12:50 2015 +0200
@@ -489,8 +489,10 @@
 
     @Override
     public JavaType lookupType(int cpi, int opcode) {
-        if (cpi == this.lastTypeCpi) {
-            return this.lastType;
+        synchronized (this) {
+            if (cpi == this.lastTypeCpi) {
+                return this.lastType;
+            }
         }
         final long metaspacePointer = runtime().getCompilerToVM().lookupKlassInPool(metaspaceConstantPool, cpi);
         JavaType result = getJavaType(metaspacePointer);