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 
doUnloading()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 
main(String[] args)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 
loadClass()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 
ensureJitCompiled(Class<?> cls, String methodName)58   public static native void ensureJitCompiled(Class<?> cls, String methodName);
fetchProfiles()59   public static native void fetchProfiles();
stopJit()60   public static native void stopJit();
startJit()61   public static native void startJit();
62 }
63