BadClass.java revision 2942:08092deced3f 
1/*
2 * Copyright (c) 2014, 2015, 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 * @test
26 * @bug 6898851
27 * @summary Compiling against this corrupt class file causes a stacktrace from javac
28 * @modules jdk.jdeps/com.sun.tools.classfile
29 */
30
31import java.io.File;
32import java.io.FileWriter;
33import java.io.StringWriter;
34import java.io.PrintWriter;
35import java.io.IOException;
36
37import com.sun.tools.classfile.ClassFile;
38import com.sun.tools.classfile.ClassWriter;
39import com.sun.tools.javac.Main;
40
41public class BadClass {
42    // Create and compile file containing body; return compiler output
43    static String makeClass(String dir, String filename, String body) throws IOException {
44        File file = new File(dir, filename);
45        try (FileWriter fw = new FileWriter(file)) {
46            fw.write(body);
47        }
48
49        StringWriter sw = new StringWriter();
50        PrintWriter pw = new PrintWriter(sw);
51        String args[] = { "-cp", dir, "-d", dir, "-XDrawDiagnostics", file.getPath() };
52        Main.compile(args, pw);
53        pw.close();
54        return sw.toString();
55    }
56
57    public static void main(String... args) throws Exception {
58        new File("d1").mkdir();
59        new File("d2").mkdir();
60
61        // Step 1. build an empty class with an interface
62        makeClass("d1", "Empty.java", "abstract class Empty implements Readable {}");
63
64        // Step 2. Modify classfile to have invalid constant pool index
65        ClassFile cf = ClassFile.read(new File("d1","Empty.class"));
66        cf.interfaces[0] = cf.constant_pool.size() + 10;
67        ClassWriter cw = new ClassWriter();
68        cw.write(cf, new File("d2","Empty.class"));
69
70        // Step 3. Compile use of invalid class
71        String result = makeClass("d2", "EmptyUse.java", "class EmptyUse { Empty e; }");
72        if (!result.contains("compiler.misc.bad.class.file")) {
73            System.out.println(result);
74            throw new Exception("test failed");
75        }
76    }
77}
78