Main.java revision a5a184892e60a89b564ca7c74e50b2ecb27d9f80 
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
17import java.lang.reflect.Constructor;
18import java.lang.reflect.Method;
19import java.lang.reflect.InvocationTargetException;
20
21/**
22 * Class loader test.
23 */
24public 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