--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/GraalCompiler/src/com/sun/c1x/debug/GraphvizPrinterObserver.java	Wed May 11 14:45:32 2011 +0200
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 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.c1x.debug;
+
+import java.io.*;
+
+import com.oracle.graal.graph.*;
+import com.oracle.graal.graph.vis.*;
+import com.sun.c1x.observer.*;
+
+/**
+ * Observes compilation events and uses {@link GraphvizPrinter} to produce a control flow graph in the DOT language
+ * which can be visualized with Graphviz.
+ *
+ * @author Peter Hofer
+ */
+public class GraphvizPrinterObserver implements CompilationObserver {
+
+    private int n;
+
+    public GraphvizPrinterObserver() {
+    }
+
+    public void compilationStarted(CompilationEvent event) {
+        n = 0;
+    }
+
+    public void compilationFinished(CompilationEvent event) {
+    }
+
+    public void compilationEvent(CompilationEvent event) {
+        if (event.getStartBlock() != null && !TTY.isSuppressed()) {
+            Graph graph = event.getStartBlock().graph();
+
+            String name = event.getMethod().holder().name();
+            name = name.substring(1, name.length() - 1).replace('/', '.');
+            name = name + "." + event.getMethod().name();
+            try {
+                FileOutputStream stream = new FileOutputStream(name + "_" + n + "_" + event.getLabel() + ".gv");
+                n++;
+
+                GraphvizPrinter printer = new GraphvizPrinter(stream);
+                printer.begin(name);
+                printer.print(graph, true);
+                printer.end();
+
+                stream.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}