--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/logging/CountingProxy.java	Tue May 26 17:13:37 2015 +0200
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2011, 2015, 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.jvmci.hotspot.logging;
+
+import java.lang.reflect.*;
+import java.util.*;
+import java.util.concurrent.*;
+import java.util.concurrent.atomic.*;
+
+import com.oracle.graal.debug.*;
+
+/**
+ * A java.lang.reflect proxy that hierarchically logs all method invocations along with their
+ * parameters and return values.
+ */
+public class CountingProxy<T> implements InvocationHandler {
+
+    public static final boolean ENABLED = Boolean.valueOf(System.getProperty("graal.countcalls"));
+
+    private T delegate;
+
+    private ConcurrentHashMap<Method, AtomicLong> calls = new ConcurrentHashMap<>();
+
+    public CountingProxy(T delegate) {
+        assert ENABLED;
+        TTY.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;
+        if (!calls.containsKey(method)) {
+            calls.putIfAbsent(method, new AtomicLong(0));
+        }
+        AtomicLong count = calls.get(method);
+        count.incrementAndGet();
+        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) {
+        Class<?>[] interfaces = ProxyUtil.getAllInterfaces(delegate.getClass());
+        Object obj = Proxy.newProxyInstance(interf.getClassLoader(), interfaces, new CountingProxy<>(delegate));
+        return interf.cast(obj);
+    }
+
+    private static ArrayList<CountingProxy<?>> proxies = new ArrayList<>();
+
+    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, AtomicLong> entry : calls.entrySet()) {
+            Method method = entry.getKey();
+            long count = entry.getValue().get();
+            sum += count;
+            TTY.println(delegate.getClass().getSimpleName() + "." + method.getName() + ": " + count);
+        }
+        TTY.println(delegate.getClass().getSimpleName() + " calls: " + sum);
+    }
+}