--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/Runtime/src/com/sun/hotspot/c1x/logging/LoggingProxy.java	Fri Apr 22 15:08:53 2011 +0200
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2010 Sun Microsystems, Inc.  All rights reserved.
+ *
+ * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
+ * that is described in this document. In particular, and without limitation, these intellectual property
+ * rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
+ * more additional patents or pending patent applications in the U.S. and in other countries.
+ *
+ * U.S. Government Rights - Commercial software. Government users are subject to the Sun
+ * Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
+ * supplements.
+ *
+ * Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
+ * registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
+ * are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
+ * U.S. and other countries.
+ *
+ * UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
+ * Company, Ltd.
+ */
+package com.sun.hotspot.c1x.logging;
+
+import java.lang.reflect.*;
+
+import com.sun.hotspot.c1x.server.*;
+
+/**
+ * A java.lang.reflect proxy that hierarchically logs all method invocations along with their parameters and return values.
+ *
+ * @author Lukas Stadler
+ */
+public class LoggingProxy<T> implements InvocationHandler {
+
+    private T delegate;
+
+    public LoggingProxy(T delegate) {
+        this.delegate = delegate;
+    }
+
+    @Override
+    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+        int argCount = args == null ? 0 : args.length;
+        if (method.getParameterTypes().length != argCount) {
+            throw new RuntimeException("wrong parameter count");
+        }
+        StringBuilder str = new StringBuilder();
+        str.append(method.getReturnType().getSimpleName() + " " + method.getDeclaringClass().getSimpleName() + "." + method.getName() + "(");
+        for (int i = 0; i < argCount; i++) {
+            str.append(i == 0 ? "" : ", ");
+            str.append(Logger.pretty(args[i]));
+        }
+        str.append(")");
+        Logger.startScope(str.toString());
+        final Object result;
+        try {
+            if (args == null) {
+                result = method.invoke(delegate);
+            } else {
+                result = method.invoke(delegate, args);
+            }
+        } catch (InvocationTargetException e) {
+            Logger.endScope(" = Exception " + e.getMessage());
+            throw e.getCause();
+        }
+        Logger.endScope(" = " + Logger.pretty(result));
+        return result;
+    }
+
+    /**
+     * The object returned by this method will implement all interfaces that are implemented by delegate.
+     */
+    public static <T> T getProxy(Class<T> interf, T delegate) {
+        Class<?>[] interfaces = ReplacingStreams.getAllInterfaces(delegate.getClass());
+        Object obj = Proxy.newProxyInstance(interf.getClassLoader(), interfaces, new LoggingProxy<T>(delegate));
+        return interf.cast(obj);
+    }
+}