--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/logging/CountingProxy.java	Thu Sep 30 17:19:48 2010 -0700
@@ -0,0 +1,95 @@
+/*
+ * 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 java.util.*;
+
+/**
+ * A java.lang.reflect proxy that hierarchically logs all method invocations along with their parameters and return
+ * values.
+ *
+ * @author Lukas Stadler
+ */
+public class CountingProxy<T> implements InvocationHandler {
+
+    public static final boolean ENABLED = Boolean.valueOf(System.getProperty("c1x.countcalls"));
+
+    private T delegate;
+
+    private Map<Method, Long> calls = new HashMap<Method, Long>();
+
+    public CountingProxy(T delegate) {
+        assert ENABLED;
+        System.out.println("Counting proxy for " + delegate.getClass().getSimpleName() + " created");
+        this.delegate = delegate;
+        proxies.add(this);
+    }
+
+    @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");
+        final Object result;
+        long count = calls.containsKey(method) ? calls.get(method) : 0;
+        calls.put(method, count + 1);
+        try {
+            if (args == null) {
+                result = method.invoke(delegate);
+            } else {
+                result = method.invoke(delegate, args);
+            }
+        } catch (InvocationTargetException e) {
+            throw e.getCause();
+        }
+        return result;
+    }
+
+    public static <T> T getProxy(Class<T> interf, T delegate) {
+        Object obj = Proxy.newProxyInstance(interf.getClassLoader(), new Class[] { interf}, new CountingProxy<T>(delegate));
+        return interf.cast(obj);
+    }
+
+    private static ArrayList<CountingProxy> proxies = new ArrayList<CountingProxy>();
+
+    static {
+        if (ENABLED) {
+            Runtime.getRuntime().addShutdownHook(new Thread() {
+
+                @Override
+                public void run() {
+                    for (CountingProxy proxy : proxies) {
+                        proxy.print();
+                    }
+                }
+            });
+        }
+    }
+
+    protected void print() {
+        long sum = 0;
+        for (Map.Entry<Method, Long> entry : calls.entrySet()) {
+            Method method = entry.getKey();
+            long count = entry.getValue();
+            sum += count;
+            System.out.println(delegate.getClass().getSimpleName() + "." + method.getName() + ": " + count);
+        }
+        System.out.println(delegate.getClass().getSimpleName() + " calls: " + sum);
+    }
+}