--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/tools/IdealGraphVisualizer/Graal/src/com/sun/hotspot/igv/graal/filters/GraalSlotFilter.java	Wed Jun 29 12:22:46 2011 +0200
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+package com.sun.hotspot.igv.graal.filters;
+
+import com.sun.hotspot.igv.filter.AbstractFilter;
+import com.sun.hotspot.igv.graph.Diagram;
+import com.sun.hotspot.igv.graph.Figure;
+import com.sun.hotspot.igv.graph.InputSlot;
+import com.sun.hotspot.igv.graph.OutputSlot;
+import com.sun.hotspot.igv.graph.Slot;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Filter that hides slots with no connections.
+ */
+public class GraalSlotFilter extends AbstractFilter {
+
+    public GraalSlotFilter() {
+    }
+
+    public String getName() {
+        return "Graal Slot Filter";
+    }
+
+    public void apply(Diagram d) {
+        List<Figure> figures = d.getFigures();
+        for (Figure f : figures) {
+            List<Slot> remove = new ArrayList<Slot>();
+            for (InputSlot is : f.getInputSlots()) {
+                if (is.getConnections().isEmpty()) {
+                    remove.add(is);
+                }
+            }
+            for (OutputSlot os : f.getOutputSlots()) {
+                if (os.getConnections().isEmpty()) {
+                    remove.add(os);
+                }
+            }
+            for (Slot s : remove) {
+                f.removeSlot(s);
+            }
+        }
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/tools/IdealGraphVisualizer/Graal/src/com/sun/hotspot/igv/graal/filters/slots.filter	Wed Jun 29 12:22:46 2011 +0200
@@ -0,0 +1,2 @@
+var f = new com.sun.hotspot.igv.graal.filters.GraalSlotFilter();
+f.apply(graph);

--- a/src/share/tools/IdealGraphVisualizer/Graal/src/com/sun/hotspot/igv/graal/layer.xml	Tue Jun 28 19:54:51 2011 +0200
+++ b/src/share/tools/IdealGraphVisualizer/Graal/src/com/sun/hotspot/igv/graal/layer.xml	Wed Jun 29 12:22:46 2011 +0200
@@ -9,5 +9,9 @@
         <file name="Graal Edge Coloring" url="filters/edgeColor.filter">
             <attr name="enabled" boolvalue="false"/>
         </file>
+        
+        <file name="Graal Slot Filter" url="filters/slots.filter">
+            <attr name="enabled" boolvalue="false"/>
+        </file>
     </folder>
 </filesystem>