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.compiler/com.sun.tools.classfile 29 * @clean ClassRefDupInConstantPoolTest$Duplicates.class 30 * @run main ClassRefDupInConstantPoolTest 31 */ 32 33 import java.util.TreeSet; 34 35 import com.sun.tools.classfile.*; 36 import com.sun.tools.classfile.ConstantPool.*; 37 38 public class ClassRefDupInConstantPoolTest { 39 public static void main(String[] args) throws Exception { 40 ClassFile cls = ClassFile.read(ClassRefDupInConstantPoolTest.class. 41 getResourceAsStream("ClassRefDupInConstantPoolTest$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 }