VictimClassLoader.java revision 12158:0fe2815ffa74 
1/*
2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24public class VictimClassLoader extends ClassLoader {
25    public static long counter = 0;
26
27    private int which = (int) ++counter;
28
29    protected VictimClassLoader() {
30        super(VictimClassLoader.class.getClassLoader());
31    }
32
33    protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
34        Class c;
35        if (!name.endsWith("Victim")) {
36            c = super.loadClass(name, resolve);
37            return c;
38        }
39
40        c = findLoadedClass(name);
41        if (c != null) {
42            return c;
43        }
44
45        byte[] buf = readClassFile(name);
46        c = defineClass(name, buf, 0, buf.length);
47        resolveClass(c);
48
49        if (c.getClassLoader() != this) {
50            throw new AssertionError();
51        }
52
53        Test8003720.println("loaded " + c + "#" + System.identityHashCode(c) + " in " + c.getClassLoader());
54        return c;
55    }
56
57    static byte[] readClassFile(String name) {
58        try {
59            String rname = name.substring(name.lastIndexOf('.') + 1) + ".class";
60            java.net.URL url = VictimClassLoader.class.getResource(rname);
61            Test8003720.println("found " + rname + " = " + url);
62
63            java.net.URLConnection connection = url.openConnection();
64            int contentLength = connection.getContentLength();
65            byte[] buf = readFully(connection.getInputStream(), contentLength);
66
67            return Asmator.fixup(buf);
68        } catch (java.io.IOException ex) {
69            throw new Error(ex);
70        }
71    }
72
73    static byte[] readFully(java.io.InputStream in, int len) throws java.io.IOException {
74        byte[] b = in.readAllBytes();
75        if (len != -1 && b.length != len)
76            throw new java.io.IOException("Expected:" + len + ", actual:" + b.length);
77        return b;
78    }
79
80    public void finalize() {
81        Test8003720.println("Goodbye from " + this);
82    }
83
84    public String toString() {
85        return "VictimClassLoader#" + which;
86    }
87}
88