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diff --git a/src/proguard/obfuscate/NameAndTypeUsageMarker.java b/src/proguard/obfuscate/NameAndTypeUsageMarker.java
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+++ b/src/proguard/obfuscate/NameAndTypeUsageMarker.java
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+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
+ *
+ * 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 of the License, 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; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package proguard.obfuscate;
+
+import proguard.classfile.*;
+import proguard.classfile.attribute.*;
+import proguard.classfile.attribute.visitor.AttributeVisitor;
+import proguard.classfile.constant.*;
+import proguard.classfile.constant.visitor.ConstantVisitor;
+import proguard.classfile.util.SimplifiedVisitor;
+import proguard.classfile.visitor.ClassVisitor;
+
+/**
+ * This ClassVisitor marks all NameAndType constant pool entries that are
+ * being used in the program classes it visits.
+ *
+ * @see NameAndTypeShrinker
+ *
+ * @author Eric Lafortune
+ */
+public class NameAndTypeUsageMarker
+extends      SimplifiedVisitor
+implements   ClassVisitor,
+             ConstantVisitor,
+             AttributeVisitor
+{
+    // A visitor info flag to indicate the NameAndType constant pool entry is being used.
+    private static final Object USED = new Object();
+
+
+    // Implementations for ClassVisitor.
+
+    public void visitProgramClass(ProgramClass programClass)
+    {
+        // Mark the NameAndType entries referenced by all other constant pool
+        // entries.
+        programClass.constantPoolEntriesAccept(this);
+
+        // Mark the NameAndType entries referenced by all EnclosingMethod
+        // attributes.
+        programClass.attributesAccept(this);
+    }
+
+
+    // Implementations for ConstantVisitor.
+
+    public void visitAnyConstant(Clazz clazz, Constant constant) {}
+
+
+    public void visitFieldrefConstant(Clazz clazz, FieldrefConstant fieldrefConstant)
+    {
+        visitRefConstant(clazz, fieldrefConstant);
+    }
+
+
+    public void visitInterfaceMethodrefConstant(Clazz clazz, InterfaceMethodrefConstant interfaceMethodrefConstant)
+    {
+        visitRefConstant(clazz, interfaceMethodrefConstant);
+    }
+
+
+    public void visitMethodrefConstant(Clazz clazz, MethodrefConstant methodrefConstant)
+    {
+        visitRefConstant(clazz, methodrefConstant);
+    }
+
+
+    private void visitRefConstant(Clazz clazz, RefConstant refConstant)
+    {
+        markNameAndTypeConstant(clazz, refConstant.u2nameAndTypeIndex);
+    }
+
+
+    // Implementations for AttributeVisitor.
+
+    public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
+
+
+    public void visitEnclosingMethodAttribute(Clazz clazz, EnclosingMethodAttribute enclosingMethodAttribute)
+    {
+        if (enclosingMethodAttribute.u2nameAndTypeIndex != 0)
+        {
+            markNameAndTypeConstant(clazz, enclosingMethodAttribute.u2nameAndTypeIndex);
+        }
+    }
+
+
+    // Small utility methods.
+
+    /**
+     * Marks the given UTF-8 constant pool entry of the given class.
+     */
+    private void markNameAndTypeConstant(Clazz clazz, int index)
+    {
+         markAsUsed((NameAndTypeConstant)((ProgramClass)clazz).getConstant(index));
+    }
+
+
+    /**
+     * Marks the given VisitorAccepter as being used.
+     * In this context, the VisitorAccepter will be a NameAndTypeConstant object.
+     */
+    private static void markAsUsed(VisitorAccepter visitorAccepter)
+    {
+        visitorAccepter.setVisitorInfo(USED);
+    }
+
+
+    /**
+     * Returns whether the given VisitorAccepter has been marked as being used.
+     * In this context, the VisitorAccepter will be a NameAndTypeConstant object.
+     */
+    static boolean isUsed(VisitorAccepter visitorAccepter)
+    {
+        return visitorAccepter.getVisitorInfo() == USED;
+    }
+}