1 /* 2 * Copyright (C) 2015 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.Field; 18 import java.lang.reflect.Method; 19 import java.util.List; 20 import p1.InP1; 21 import p1.PlaceHolder; 22 23 24 // Custom class loader to prevent loading while verifying. 25 class MyClassLoader extends ClassLoader { 26 MyClassLoader() throws Exception { 27 super(MyClassLoader.class.getClassLoader()); 28 29 // Some magic to get access to the pathList field of BaseDexClassLoader. 30 ClassLoader loader = getClass().getClassLoader(); 31 Class<?> baseDexClassLoader = loader.getClass().getSuperclass(); 32 Field f = baseDexClassLoader.getDeclaredField("pathList"); 33 f.setAccessible(true); 34 Object pathList = f.get(loader); 35 36 // Some magic to get access to the dexField field of pathList. 37 f = pathList.getClass().getDeclaredField("dexElements"); 38 f.setAccessible(true); 39 dexElements = (Object[]) f.get(pathList); 40 dexFileField = dexElements[0].getClass().getDeclaredField("dexFile"); 41 dexFileField.setAccessible(true); 42 } 43 44 Object[] dexElements; 45 Field dexFileField; 46 47 protected Class<?> loadClass(String className, boolean resolve) throws ClassNotFoundException { 48 if (className.equals("p1.OtherInP1") && !p1.PlaceHolder.entered) { 49 // The request comes from the verifier. Return null to get the access check entry 50 // point in the compiled code. 51 return null; 52 } 53 // Mimic what DexPathList.findClass is doing. 54 try { 55 for (Object element : dexElements) { 56 Object dex = dexFileField.get(element); 57 Method method = dex.getClass().getDeclaredMethod( 58 "loadClassBinaryName", String.class, ClassLoader.class, List.class); 59 60 if (dex != null) { 61 Class<?> clazz = (Class<?>)method.invoke(dex, className, this, null); 62 if (clazz != null) { 63 return clazz; 64 } 65 } 66 } 67 } catch (Exception e) { /* Ignore */ } 68 return getParent().loadClass(className); 69 } 70 } 71 72 public class Main { 73 public static void main(String[] args) throws Exception { 74 MyClassLoader o = new MyClassLoader(); 75 Class<?> foo = o.loadClass("LoadedByMyClassLoader"); 76 Method m = foo.getDeclaredMethod("main"); 77 m.invoke(null); 78 } 79 } 80 81 class LoadedByMyClassLoader { 82 public static void main() throws Exception { 83 for (int i = 0; i < 10000; ++i) { 84 // Warm up the JIT. 85 doTheCall(i); 86 } 87 // Sleep a while to let the JIT compile things. 88 // TODO(ngeoffray): Remove the sleep. b/25414532 89 Thread.sleep(2000); 90 doTheCall(10001); 91 } 92 93 public static void doTheCall(int i) { 94 InP1.$inline$AllocateOtherInP1(i); 95 InP1.$inline$AllocateArrayOtherInP1(i); 96 InP1.$inline$UseStaticFieldOtherInP1(i); 97 InP1.$inline$SetStaticFieldOtherInP1(i); 98 InP1.$inline$UseInstanceFieldOtherInP1(i); 99 InP1.$inline$SetInstanceFieldOtherInP1(i); 100 InP1.$inline$LoadOtherInP1(i); 101 InP1.$inline$StaticCallOtherInP1(i); 102 InP1.$inline$InstanceCallOtherInP1(i); 103 } 104 } 105
