# HG changeset patch
# User Doug Simon <doug.simon@oracle.com>
# Date 1418560982 -3600
# Node ID 72d0cd2eeca455b65dde29d5b3c203c14e4471eb
# Parent  ecb9d0cedbab850ea3f4ab0fd8943036c8469c06
handle null in HotSpotzreferenceMap.getFrameMap()|getRegisterMap()

diff -r ecb9d0cedbab -r 72d0cd2eeca4 graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/HotSpotReferenceMap.java
--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/HotSpotReferenceMap.java	Sat Dec 13 15:03:20 2014 +0100
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/HotSpotReferenceMap.java	Sun Dec 14 13:43:02 2014 +0100
@@ -168,11 +168,11 @@
     }
 
     public BitSet getFrameMap() {
-        return (BitSet) frameRefMap.clone();
+        return frameRefMap == null ? null : (BitSet) frameRefMap.clone();
     }
 
     public BitSet getRegisterMap() {
-        return (BitSet) registerRefMap.clone();
+        return registerRefMap == null ? null : (BitSet) registerRefMap.clone();
     }
 
     // clear