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comparison test/runtime/8003720/VictimClassLoader.java @ 7179:d0aa87f04bd5

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8003720: NPG: Method in interpreter stack frame can be deallocated Summary: Pass down a closure during root scanning to keep the class of the method alive. Reviewed-by: coleenp, jcoomes
author stefank
date Tue, 27 Nov 2012 10:13:20 +0100
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7178:19c1bd641922 7179:d0aa87f04bd5
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 */
24
25 public class VictimClassLoader extends ClassLoader {
26 public static long counter = 0;
27
28 private int which = (int) ++counter;
29
30 protected VictimClassLoader() {
31 super(VictimClassLoader.class.getClassLoader());
32 }
33
34 protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
35 Class c;
36 if (!name.endsWith("Victim")) {
37 c = super.loadClass(name, resolve);
38 return c;
39 }
40
41 c = findLoadedClass(name);
42 if (c != null) {
43 return c;
44 }
45
46 byte[] buf = readClassFile(name);
47 c = defineClass(name, buf, 0, buf.length);
48 resolveClass(c);
49
50 if (c.getClassLoader() != this) {
51 throw new AssertionError();
52 }
53
54 Test8003720.println("loaded " + c + "#" + System.identityHashCode(c) + " in " + c.getClassLoader());
55 return c;
56 }
57
58 static byte[] readClassFile(String name) {
59 try {
60 String rname = name.substring(name.lastIndexOf('.') + 1) + ".class";
61 java.net.URL url = VictimClassLoader.class.getResource(rname);
62 Test8003720.println("found " + rname + " = " + url);
63
64 java.net.URLConnection connection = url.openConnection();
65 int contentLength = connection.getContentLength();
66 byte[] buf = readFully(connection.getInputStream(), contentLength);
67
68 return Asmator.fixup(buf);
69 } catch (java.io.IOException ex) {
70 throw new Error(ex);
71 }
72 }
73
74 static byte[] readFully(java.io.InputStream in, int len) throws java.io.IOException {
75 // Warning here:
76 return sun.misc.IOUtils.readFully(in, len, true);
77 }
78
79 public void finalize() {
80 Test8003720.println("Goodbye from " + this);
81 }
82
83 public String toString() {
84 return "VictimClassLoader#" + which;
85 }
86 }