--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.graal.debug/src/com/oracle/max/graal/debug/Debug.java	Tue Jan 10 20:13:56 2012 +0100
@@ -0,0 +1,81 @@
+/*
+ * 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.max.graal.debug;
+
+import java.io.*;
+
+
+public class Debug {
+    public static boolean ENABLED = false;
+
+    public static void log(String msg, Object... args) {
+        if (ENABLED) {
+            DebugContext.getInstance().log(msg, args);
+        }
+    }
+
+    public static Scope openScope(String name, Object... context) {
+        if (ENABLED) {
+            return new Scope(name, context);
+        } else {
+            return VOID_SCOPE;
+        }
+    }
+
+    private static final Scope VOID_SCOPE = new Scope(null);
+
+    public static final class Scope implements Closeable {
+        private String name;
+        private Object[] context;
+
+        private Scope(String name, Object... context) {
+            this.name = name;
+            this.context = context;
+        }
+
+        @Override
+        public void close() throws IOException {
+        }
+    }
+
+    private static class ScopeChild {
+        private String name;
+
+        protected ScopeChild(String name) {
+            this.name = name;
+        }
+    }
+
+    public static final class Metric extends ScopeChild {
+        private Metric(String name) {
+            super(name);
+        }
+
+    }
+
+    public static final class Timer extends ScopeChild {
+        private Timer(String name) {
+            super(name);
+        }
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.graal.debug/src/com/oracle/max/graal/debug/DebugContext.java	Tue Jan 10 20:13:56 2012 +0100
@@ -0,0 +1,43 @@
+/*
+ * 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.max.graal.debug;
+
+
+class DebugContext {
+
+    private static ThreadLocal<DebugContext> instance = new ThreadLocal<>();
+
+    static DebugContext getInstance() {
+        if (instance.get() == null) {
+            instance.set(new DebugContext());
+        }
+        return instance.get();
+    }
+
+    void log(String msg, Object... args) {
+    }
+
+    void scope(Runnable runnable, String name, Object... context) {
+        runnable.run();
+    }
+}