optimization: less ArrayList garbage creation!

diff --git a/weaver/src/org/aspectj/weaver/Shadow.java b/weaver/src/org/aspectj/weaver/Shadow.java
index 2436a6c0e47dacf0bd1cbd644b60ee05af179770..e9b2560271579075f3a47083738f0094bb214972 100644 (file)
--- a/weaver/src/org/aspectj/weaver/Shadow.java
+++ b/weaver/src/org/aspectj/weaver/Shadow.java
@@ -16,6 +16,7 @@ package org.aspectj.weaver;
 import java.io.DataInputStream;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
@@ -49,7 +50,7 @@ public abstract class Shadow {
     private Member matchingSignature;
     private ResolvedMember resolvedSignature;
        protected final Shadow enclosingShadow;
-    protected List mungers = new ArrayList(1);
+    protected List mungers = Collections.EMPTY_LIST;
 
     public int shadowId = nextShadowID++;  // every time we build a shadow, it gets a new id
 
@@ -442,7 +443,10 @@ public abstract class Shadow {
        
        
     public void addMunger(ShadowMunger munger) {
-       if (checkMunger(munger)) this.mungers.add(munger);
+       if (checkMunger(munger)) {
+               if (mungers==Collections.EMPTY_LIST) mungers = new ArrayList();
+               this.mungers.add(munger);
+       }
     }
  
     public final void implement() {