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.Constructor; 18 19 public class Main { 20 static final String DEX_FILE = 21 System.getenv("DEX_LOCATION") + "/661-classloader-allocator-ex.jar"; 22 static final String LIBRARY_SEARCH_PATH = System.getProperty("java.library.path"); 23 24 private static void doUnloading() { 25 // Stop the JIT to ensure its threads and work queue are not keeping classes 26 // artifically alive. 27 stopJit(); 28 // Do multiple GCs to prevent rare flakiness if some other thread is keeping the 29 // classloader live. 30 for (int i = 0; i < 5; ++i) { 31 Runtime.getRuntime().gc(); 32 } 33 startJit(); 34 } 35 36 public static void main(String[] args) throws Exception { 37 System.loadLibrary(args[0]); 38 loadClass(); 39 doUnloading(); 40 // fetchProfiles iterate over the ProfilingInfo, we used to crash in the presence 41 // of unloaded copied methods. 42 fetchProfiles(); 43 } 44 45 public static void loadClass() throws Exception { 46 Class<?> pathClassLoader = Class.forName("dalvik.system.PathClassLoader"); 47 if (pathClassLoader == null) { 48 throw new AssertionError("Couldn't find path class loader class"); 49 } 50 Constructor<?> constructor = 51 pathClassLoader.getDeclaredConstructor(String.class, String.class, ClassLoader.class); 52 ClassLoader loader = (ClassLoader) constructor.newInstance( 53 DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader()); 54 Class<?> otherClass = loader.loadClass("p1.OtherClass"); 55 ensureJitCompiled(otherClass, "foo"); 56 } 57 58 public static native void ensureJitCompiled(Class<?> cls, String methodName); 59 public static native void fetchProfiles(); 60 public static native void stopJit(); 61 public static native void startJit(); 62 } 63
