--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/java/transform/FixWarningsVisitor.java	Mon Aug 11 15:57:14 2014 +0200
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2012, 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.oracle.truffle.dsl.processor.java.transform;
+
+import static com.oracle.truffle.dsl.processor.java.ElementUtils.*;
+import static javax.lang.model.element.Modifier.*;
+
+import java.io.*;
+import java.util.*;
+
+import javax.lang.model.element.*;
+import javax.lang.model.type.*;
+
+import com.oracle.truffle.dsl.processor.*;
+import com.oracle.truffle.dsl.processor.java.*;
+import com.oracle.truffle.dsl.processor.java.model.*;
+
+public class FixWarningsVisitor extends CodeElementScanner<Void, Void> {
+
+    private final Set<String> symbolsUsed = new HashSet<>();
+
+    private final ProcessorContext context;
+    private final DeclaredType unusedAnnotation;
+    private final DeclaredType overrideType;
+
+    public FixWarningsVisitor(ProcessorContext context, DeclaredType unusedAnnotation, DeclaredType overrideType) {
+        this.context = context;
+        this.unusedAnnotation = unusedAnnotation;
+        this.overrideType = overrideType;
+    }
+
+    @Override
+    public Void visitType(CodeTypeElement e, Void p) {
+        List<TypeElement> superTypes = ElementUtils.getSuperTypes(e);
+        for (TypeElement type : superTypes) {
+            String qualifiedName = ElementUtils.getQualifiedName(type);
+            if (qualifiedName.equals(Serializable.class.getCanonicalName())) {
+                if (!e.containsField("serialVersionUID")) {
+                    e.add(new CodeVariableElement(modifiers(PRIVATE, STATIC, FINAL), context.getType(long.class), "serialVersionUID", "1L"));
+                }
+                break;
+            }
+        }
+
+        return super.visitType(e, p);
+    }
+
+    @Override
+    public Void visitExecutable(CodeExecutableElement e, Void p) {
+        if (e.getParameters().isEmpty()) {
+            return null;
+        } else if (e.getModifiers().contains(Modifier.ABSTRACT)) {
+            return null;
+        } else if (containsOverride(e)) {
+            return null;
+        }
+
+        symbolsUsed.clear();
+        super.visitExecutable(e, p);
+
+        for (VariableElement parameter : e.getParameters()) {
+            if (!symbolsUsed.contains(parameter.getSimpleName().toString())) {
+                e.getAnnotationMirrors().add(createUnusedAnnotationMirror());
+                break;
+            }
+        }
+        return null;
+    }
+
+    private boolean containsOverride(CodeExecutableElement e) {
+        for (AnnotationMirror mirror : e.getAnnotationMirrors()) {
+            if (ElementUtils.typeEquals(overrideType, mirror.getAnnotationType())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private CodeAnnotationMirror createUnusedAnnotationMirror() {
+        CodeAnnotationMirror mirror = new CodeAnnotationMirror(unusedAnnotation);
+        mirror.setElementValue(mirror.findExecutableElement("value"), new CodeAnnotationValue("unused"));
+        return mirror;
+    }
+
+    @Override
+    public void visitTree(CodeTree e, Void p) {
+        if (e.getString() != null) {
+            computeSymbols(e.getString());
+        }
+        super.visitTree(e, p);
+    }
+
+    private void computeSymbols(String s) {
+        // TODO there should not be any need for a StringTokenizer if we have a real AST for
+        // method bodies. Also the current solution is not perfect. What if one token
+        // is spread across multiple CodeTree instances? But for now that works.
+        StringTokenizer tokenizer = new StringTokenizer(s, ".= :,()[];{}\"\"'' ", false);
+        while (tokenizer.hasMoreElements()) {
+            String token = tokenizer.nextToken().trim();
+            if (token.length() > 0) {
+                symbolsUsed.add(token);
+            }
+        }
+    }
+
+}