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      1 /*
      2  * Copyright (C) 2016 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 import dalvik.system.PathClassLoader;
     21 
     22 // ClassLoader not delegating for non java. packages.
     23 class DelegateLastPathClassLoader extends PathClassLoader {
     24 
     25   public DelegateLastPathClassLoader(String dexPath, ClassLoader parent) {
     26     super(dexPath, parent);
     27   }
     28 
     29   @Override
     30   protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
     31     if (!name.startsWith("java.")) {
     32       try {
     33         return findClass(name);
     34       } catch (ClassNotFoundException ignore) {
     35         // Ignore and fall through to parent class loader.
     36       }
     37     }
     38     return super.loadClass(name, resolve);
     39   }
     40 }
     41 
     42 public class Main {
     43 
     44    private static Class<?> classFromDifferentLoader() throws Exception {
     45      final String DEX_FILE = System.getenv("DEX_LOCATION") + "/612-jit-dex-cache-ex.jar";
     46      ClassLoader loader = new DelegateLastPathClassLoader(DEX_FILE, Main.class.getClassLoader());
     47      return loader.loadClass("LoadedByAppClassLoader");
     48   }
     49 
     50   public static void main(String[] args) throws Exception {
     51     System.loadLibrary(args[0]);
     52     Class<?> cls = classFromDifferentLoader();
     53     Method m = cls.getDeclaredMethod("letMeInlineYou", A.class);
     54     B b = new B();
     55     // Invoke the method enough times to get an inline cache and get JITted.
     56     for (int i = 0; i < 10000; ++i) {
     57       m.invoke(null, b);
     58     }
     59     m = cls.getDeclaredMethod("areYouB", null);
     60     ClassLoader loader = (ClassLoader) m.invoke(null);
     61     if (loader != cls.getClassLoader()) {
     62       throw new Error("Wrong class loader");
     63     }
     64   }
     65 
     66   public static native void ensureJitCompiled(Class<?> cls, String method_name);
     67 }
     68