1 /* 2 * Copyright (C) 2024 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.invoke.MethodType; 18 import java.lang.ref.Reference; 19 import java.lang.ref.WeakReference; 20 import java.lang.reflect.Constructor; 21 import java.lang.reflect.Method; 22 23 public class Main { 24 private static final String DEX_FILE = 25 System.getenv("DEX_LOCATION") + "/2276-const-method-type-gc-cleanup-ex.jar"; 26 private static final String LIBRARY_SEARCH_PATH = System.getProperty("java.library.path"); 27 main(String[] args)28 public static void main(String[] args) throws Throwable { 29 System.loadLibrary(args[0]); 30 31 Class<?> pathClassLoader = Class.forName("dalvik.system.PathClassLoader"); 32 if (pathClassLoader == null) { 33 throw new AssertionError("Couldn't find path class loader class"); 34 } 35 Constructor<?> constructor = 36 pathClassLoader.getDeclaredConstructor(String.class, String.class, ClassLoader.class); 37 38 // Identical to Worker.returnStringMethodType() and is captured by JIT-ed code. 39 MethodType returnStringMethodType = MethodType.methodType(String.class); 40 41 for (int i = 0; i < 10; ++i) { 42 callDoWork(constructor); 43 } 44 45 Reference.reachabilityFence(returnStringMethodType); 46 } 47 callDoWork(Constructor constructor)48 private static void callDoWork(Constructor constructor) throws Throwable { 49 WeakReference loaderRef = $noinline$doRealWork(constructor); 50 51 doUnload(); 52 53 if (loaderRef.refersTo(null)) { 54 System.out.println("ClassLoader was unloaded"); 55 } 56 } 57 $noinline$doRealWork(Constructor constructor)58 private static WeakReference $noinline$doRealWork(Constructor constructor) throws Throwable { 59 ClassLoader loader = (ClassLoader) constructor.newInstance( 60 DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader()); 61 62 Class workerClass = loader.loadClass("Worker"); 63 64 if (workerClass.getClassLoader() != loader) { 65 throw new AssertionError("The class was loaded by a wrong ClassLoader"); 66 } 67 68 ensureJitCompiled(workerClass, "doWork"); 69 70 Method m = workerClass.getDeclaredMethod("doWork"); 71 m.invoke(null); 72 73 WeakReference loaderRef = new WeakReference(loader); 74 75 m = null; 76 workerClass = null; 77 loader = null; 78 79 return loaderRef; 80 } 81 doUnload()82 private static void doUnload() { 83 for (int i = 0; i < 3; ++i) { 84 Runtime.getRuntime().gc(); 85 System.runFinalization(); 86 } 87 } 88 ensureJitCompiled(Class<?> cls, String methodName)89 public static native void ensureJitCompiled(Class<?> cls, String methodName); 90 } 91