--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.base/src/com/sun/max/program/ProgramWarning.java	Sat Dec 17 19:59:18 2011 +0100
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2007, 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.max.program;
+
+/**
+ * A collection of static methods for reporting a warning when an unexpected, non-fatal condition is encountered.
+ */
+public final class ProgramWarning {
+
+    /**
+     * Implemented by a client that can {@linkplain ProgramWarning#setHandler(Handler) register}
+     * itself to handle program warnings instead of having them printed to {@link System#err}.
+     */
+    public interface Handler {
+
+        /**
+         * Handles display a given warning message.
+         *
+         * @param message a warning message
+         */
+        void handle(String message);
+    }
+
+    /**
+     * Registers a handler to which warnings are redirected. Any previously registered handler
+     * is overwritten and discarded.
+     *
+     * @param h if non-null, this object's {@link Handler#handle(String)} method is messaged instead of
+     *            printing the warning to {@link System#err} a ProgramError.
+     */
+    public static void setHandler(Handler h) {
+        handler = h;
+    }
+
+    private static Handler handler;
+
+    private ProgramWarning() {
+    }
+
+    /**
+     * Prints a given warning message.
+     *
+     * @param warning the warning message to print
+     */
+    public static void message(String warning) {
+        if (handler != null) {
+            handler.handle(warning);
+        } else {
+            System.err.println("WARNING: " + warning);
+        }
+    }
+
+    /**
+     * Checks a given condition and if it's {@code false}, the appropriate warning message is printed.
+     *
+     * @param condition a condition to test
+     * @param message the warning message to be printed if {@code condition == false}
+     */
+    public static void check(boolean condition, String warning) {
+        if (!condition) {
+            message(warning);
+        }
+    }
+}