ClassRefDupInConstantPoolTest.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 8015927
27 * @summary Class reference duplicates in constant pool
28 * @modules jdk.jdeps/com.sun.tools.classfile
29 * @clean ClassRefDupInConstantPoolTest$Duplicates.class
30 * @run main ClassRefDupInConstantPoolTest
31 */
32
33import java.util.TreeSet;
34
35import com.sun.tools.classfile.*;
36import com.sun.tools.classfile.ConstantPool.*;
37
38public class ClassRefDupInConstantPoolTest {
39    public static void main(String[] args) throws Exception {
40        ClassFile cls = ClassFile.read(ClassRefDupInConstantPoolTest.class.
41                                       getResourceAsStream("ClassRefDupInConstantPoolTest$Duplicates.class"));
42        ConstantPool pool = cls.constant_pool;
43
44        int duplicates = 0;
45        TreeSet<Integer> set = new TreeSet<>();
46        for (CPInfo i : pool.entries()) {
47            if (i.getTag() == ConstantPool.CONSTANT_Class) {
48                CONSTANT_Class_info ci = (CONSTANT_Class_info)i;
49                if (!set.add(ci.name_index)) {
50                    duplicates++;
51                    System.out.println("DUPLICATE CLASS REF " + ci.getName());
52                }
53            }
54        }
55        if (duplicates > 0)
56            throw new Exception("Test Failed");
57    }
58
59    class Duplicates {
60        String concat(String s1, String s2) {
61            return s1 + (s2 == s1 ? " " : s2);
62        }
63    }
64}
65