jdk

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/*
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 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/*
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 * @test
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 * @bug 8015927
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 * @summary Class reference duplicates in constant pool
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 * @enablePreview
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 * @clean ClassRefDupInConstantPoolTest$Duplicates
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 * @run main ClassRefDupInConstantPoolTest
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 */
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import java.util.TreeSet;
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import java.lang.classfile.*;
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import java.lang.classfile.constantpool.*;
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public class ClassRefDupInConstantPoolTest {
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    public static void main(String[] args) throws Exception {
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        ClassModel cls = ClassFile.of().parse(ClassRefDupInConstantPoolTest.class.
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                                       getResourceAsStream("ClassRefDupInConstantPoolTest$Duplicates.class").readAllBytes());
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        ConstantPool pool = cls.constantPool();
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        int duplicates = 0;
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        TreeSet<String> set = new TreeSet<>();
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        for (PoolEntry pe : pool) {
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            if (pe instanceof ClassEntry ce) {
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                if (!set.add(ce.asInternalName())) {
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                    duplicates++;
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                    System.out.println("DUPLICATE CLASS REF " + ce.asInternalName());
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                }
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            }
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        }
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        if (duplicates > 0)
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            throw new Exception("Test Failed");
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    }
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    class Duplicates {
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        String concat(String s1, String s2) {
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            return s1 + (s2 == s1 ? " " : s2);
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        }
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    }
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}
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