--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/Log.java	Wed Jun 17 10:58:08 2015 +0200
@@ -0,0 +1,63 @@
+/*
+ * 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;
+
+import javax.annotation.processing.*;
+import javax.lang.model.element.*;
+import javax.tools.Diagnostic.Kind;
+
+import com.oracle.truffle.dsl.processor.java.model.*;
+
+/**
+ * THIS IS NOT PUBLIC API.
+ */
+public class Log {
+
+    public static boolean isDebug() {
+        return false;
+    }
+
+    private final ProcessingEnvironment processingEnv;
+
+    public Log(ProcessingEnvironment env) {
+        this.processingEnv = env;
+    }
+
+    public void message(Kind kind, Element element, AnnotationMirror mirror, AnnotationValue value, String format, Object... args) {
+        AnnotationMirror usedMirror = mirror;
+        Element usedElement = element;
+        AnnotationValue usedValue = value;
+        String message = String.format(format, args);
+
+        if (element instanceof GeneratedElement) {
+            usedMirror = ((GeneratedElement) element).getGeneratorAnnotationMirror();
+            usedElement = ((GeneratedElement) element).getGeneratorElement();
+            usedValue = null;
+            if (usedElement != null) {
+                message = String.format("Element %s: %s", element, message);
+            }
+        }
+        processingEnv.getMessager().printMessage(kind, message, usedElement, usedMirror, usedValue);
+    }
+
+}