1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 import java.lang.reflect.Method; 18 import java.lang.reflect.InvocationTargetException; 19 20 class DebugProxy implements java.lang.reflect.InvocationHandler { 21 private Object obj; 22 static Class<?>[] interfaces = {Foo.class}; 23 24 public static Object newInstance(Object obj) { 25 return java.lang.reflect.Proxy.newProxyInstance( 26 Foo.class.getClassLoader(), 27 interfaces, 28 new DebugProxy(obj)); 29 } 30 31 private DebugProxy(Object obj) { 32 this.obj = obj; 33 } 34 35 public Object invoke(Object proxy, Method m, Object[] args) throws Throwable { 36 Object result; 37 if (obj == null) { 38 return null; 39 } 40 try { 41 System.out.println("before invoking method " + m.getName()); 42 result = m.invoke(obj, args); 43 } catch (InvocationTargetException e) { 44 throw e.getTargetException(); 45 } catch (Exception e) { 46 throw new RuntimeException("unexpected invocation exception: " + e.getMessage()); 47 } finally { 48 System.out.println("after invoking method " + m.getName()); 49 } 50 return result; 51 } 52 } 53 54 public class Main { 55 public static void call(Foo foo) { 56 if (foo == null) { 57 return; 58 } 59 foo.bar(null); 60 } 61 62 public static void main(String[] args) { 63 System.loadLibrary(args[0]); 64 Foo foo = (Foo)DebugProxy.newInstance(null); 65 ensureJitCompiled(Main.class, "call"); 66 call(foo); 67 } 68 69 private static native void ensureJitCompiled(Class<?> itf, String method_name); 70 } 71
