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      1 /*
      2  * Copyright (C) 2010 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 import java.lang.reflect.Method;
     19 import java.lang.reflect.InvocationTargetException;
     20 
     21 /**
     22  * Class loader test.
     23  */
     24 public class Main {
     25     /**
     26      * Thrown when an unexpected Exception is caught internally.
     27      */
     28     static class TestFailed extends Exception {
     29         public TestFailed(Throwable cause) {
     30             super(cause);
     31         }
     32     }
     33 
     34     /**
     35      * A class loader which loads classes from the dex file
     36      * "test.jar". However, it will return null when asked to load the
     37      * class InaccessibleSuper.
     38      *
     39      * When testing code calls BrokenDexLoader's findBrokenClass(),
     40      * a BrokenDexLoader will be the defining loader for the class
     41      * Inaccessible.  The VM will call the defining loader for
     42      * "InaccessibleSuper", which will return null, which the VM
     43      * should be able to deal with gracefully.
     44      *
     45      * Note that this depends heavily on the Dalvik test harness.
     46      */
     47     static class BrokenDexLoader extends ClassLoader {
     48 
     49         /** We return null when asked to load InaccessibleSuper. */
     50         private static class InaccessibleSuper {}
     51         private static class Inaccessible extends InaccessibleSuper {}
     52 
     53         private static final String SUPERCLASS_NAME =
     54                 "Main$BrokenDexLoader$InaccessibleSuper";
     55         private static final String CLASS_NAME =
     56                 "Main$BrokenDexLoader$Inaccessible";
     57 
     58         private static final String DEX_FILE = "test.jar";
     59 
     60         public BrokenDexLoader(ClassLoader parent) {
     61             super(parent);
     62         }
     63 
     64         /**
     65          * Finds the class with the specified binary name, from DEX_FILE.
     66          *
     67          * If we don't find a match, we throw an exception.
     68          */
     69         private Class<?> findDexClass(String name)
     70                 throws TestFailed, InvocationTargetException
     71         {
     72 
     73             try {
     74                 /*
     75                  * Find the DexFile class, and construct a DexFile object
     76                  * through reflection, then call loadCLass on it.
     77                  */
     78                 Class mDexClass = ClassLoader.getSystemClassLoader().
     79                         loadClass("dalvik/system/DexFile");
     80                 Constructor ctor = mDexClass.
     81                         getConstructor(new Class[] {String.class});
     82                 Object mDexFile = ctor.newInstance(DEX_FILE);
     83                 Method meth = mDexClass.
     84                         getMethod("loadClass",
     85                             new Class[] { String.class, ClassLoader.class });
     86                 /*
     87                  * Invoking loadClass on CLASS_NAME is expected to
     88                  * throw an InvocationTargetException. Anything else
     89                  * is an error we can't recover from.
     90                  */
     91                 meth.invoke(mDexFile, name, this);
     92             } catch (NoSuchMethodException nsme) {
     93                 throw new TestFailed(nsme);
     94             } catch (InstantiationException ie) {
     95                 throw new TestFailed(ie);
     96             } catch (IllegalAccessException iae) {
     97                 throw new TestFailed(iae);
     98             } catch (ClassNotFoundException cnfe) {
     99                 throw new TestFailed(cnfe);
    100             }
    101 
    102             return null;
    103         }
    104 
    105         /**
    106          * Load a class.
    107          *
    108          * Return null if the class's name is SUPERCLASS_NAME;
    109          * otherwise invoke the super's loadClass method.
    110          */
    111         public Class<?> loadClass(String name, boolean resolve)
    112                 throws ClassNotFoundException
    113         {
    114             if (SUPERCLASS_NAME.equals(name)) {
    115                 return null;
    116             }
    117 
    118             return super.loadClass(name, resolve);
    119         }
    120 
    121         /**
    122          * Attempt to find the class with the superclass we refuse to
    123          * load.  This is expected to throw an
    124          * InvocationTargetException, with a NullPointerException as
    125          * its cause.
    126          */
    127         public void findBrokenClass()
    128                 throws TestFailed, InvocationTargetException
    129         {
    130             findDexClass(CLASS_NAME);
    131         }
    132     }
    133 
    134     /**
    135      * Main entry point.
    136      */
    137     public static void main(String[] args)
    138             throws TestFailed, ClassNotFoundException {
    139         /*
    140          * Run test.
    141          */
    142         testFailLoadAndGc();
    143     }
    144 
    145     /**
    146      * See if we can GC after a failed load.
    147      */
    148     static void testFailLoadAndGc() throws TestFailed {
    149         try {
    150             BrokenDexLoader loader;
    151 
    152             loader = new BrokenDexLoader(ClassLoader.getSystemClassLoader());
    153             loader.findBrokenClass();
    154             System.err.println("ERROR: Inaccessible was accessible");
    155         } catch (InvocationTargetException ite) {
    156             Throwable cause = ite.getCause();
    157             if (cause instanceof NullPointerException) {
    158                 System.err.println("Got expected ITE/NPE");
    159             } else {
    160                 System.err.println("Got unexpected ITE");
    161                 ite.printStackTrace();
    162             }
    163         }
    164     }
    165 }
    166