diff --git a/jode/jode/flow/SlotSet.java b/jode/jode/flow/SlotSet.java
new file mode 100644
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+++ b/jode/jode/flow/SlotSet.java
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+/* SlotSet Copyright (C) 1998-1999 Jochen Hoenicke.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id$
+ */
+
+package jode.flow;
+import jode.decompiler.LocalInfo;
+import jode.util.ArrayEnum;
+
+///#ifdef JDK12
+///import java.util.Collection;
+///import java.util.AbstractSet;
+///import java.util.Iterator;
+///#else
+import jode.util.Collection;
+import jode.util.AbstractSet;
+import jode.util.Iterator;
+///#endif
+
+/**
+ * This class represents a set of local info, all having different
+ * slots.  It is used for representing the in sets of flow block. <p>
+ *
+ * Its add method will automatically merge any localinfo that have
+ * the same slot and is in the method. <p>
+ */
+public final class SlotSet extends AbstractSet implements Cloneable {
+    LocalInfo[] locals;
+    int count;
+
+    /**
+     * Creates a new empty variable set
+     */
+    public SlotSet() {
+        locals = null;
+        count = 0;
+    }
+
+    /**
+     * Creates a new pre initialized variable set
+     */
+    public SlotSet(LocalInfo[] locals) {
+        count = locals.length;
+        this.locals = locals;
+    }
+
+    public final void grow(int size) {
+        if (locals != null) {
+            size += count;
+            if (size > locals.length) {
+                int nextSize = locals.length * 2;
+//              GlobalOptions.err.println("wanted: "+size+" next: "+nextSize);
+                LocalInfo[] newLocals
+                    = new LocalInfo[nextSize > size ? nextSize : size];
+                System.arraycopy(locals, 0, newLocals, 0, count);
+                locals = newLocals;
+            }
+        } else if (size > 0)
+            locals = new LocalInfo[size];
+    }
+
+    /**
+     * Adds a local info to this variable set.
+     */
+    public boolean add(Object o) {
+	LocalInfo li = (LocalInfo) o;
+	LocalInfo contained = findSlot(li.getSlot());
+	if (contained != null) {
+	    li.combineWith(contained);
+	    return false;
+	} else {
+	    grow(1);
+	    locals[count++] = li;
+	    return true;
+	}
+    }
+
+    public final boolean contains(Object o) {
+	return containsSlot(((LocalInfo)o).getSlot());
+    }
+    
+    /**
+     * Checks if the variable set contains a local with the given name.
+     */
+    public final boolean containsSlot(int slot) {
+	return findSlot(slot) != null;
+    }
+
+    /**
+     * Checks if the variable set contains a local with the given slot.
+     */
+    public LocalInfo findSlot(int slot) {
+        for (int i=0; i<count;i++)
+            if (locals[i].getSlot() == slot)
+                return locals[i];
+        return null;
+    }
+
+    /**
+     * Removes a local info from this variable set.  
+     */
+    public boolean remove(Object li) {
+        li = ((LocalInfo) li).getLocalInfo();
+        for (int i=0; i<count;i++) {
+            if (locals[i].getLocalInfo() == li) {
+                locals[i] = locals[--count];
+		return true;
+	    }
+	}
+	return false;
+    }
+
+    public int size() {
+	return count;
+    }
+
+    public Iterator iterator() {
+	return new Iterator() {
+	    int pos = 0;
+
+	    public boolean hasNext() {
+		return pos < count;
+	    }
+	    
+	    public Object next() {
+		return locals[pos++];
+	    }
+	  
+	    public void remove() {
+		if (pos < count)
+		    System.arraycopy(locals, pos, 
+				     locals, pos-1, count - pos);
+		count--;
+		pos--;
+	    }
+	};
+    }
+    
+    /**
+     * Removes everything from this variable set.  
+     */
+    public void clear() {
+        locals = null;
+        count = 0;
+    }
+
+    public Object clone() {
+        try {
+            SlotSet other = (SlotSet) super.clone();
+            if (count > 0) {
+                other.locals = new LocalInfo[count];
+                System.arraycopy(locals, 0, other.locals, 0, count);
+            }
+            return other;
+        } catch (CloneNotSupportedException ex) {
+            throw new jode.AssertError("Clone?");
+        }
+    }
+
+    /**
+     * Merges this SlotSet with another.  For all slots occuring
+     * in both variable sets, all corresponding LocalInfos are merged.
+     * The variable sets are not changed (use union for this).
+     * @return The merged variables.
+     * @param vs the other variable set.  */
+    public void merge(VariableSet vs) {
+        for (int i=0; i<count; i++) {
+            LocalInfo li = locals[i];
+            int slot = li.getSlot();
+	    for (int j=0; j<vs.count; j++) {
+		if (li.getSlot() == vs.locals[j].getSlot())
+		    li.combineWith(vs.locals[j]);
+	    }
+	}
+    }
+}