1/* 2 * Copyright (c) 2013, 2016, 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 5053846 8011432 27 * @summary javac: MethodRef entries are duplicated in the constant pool 28 * @summary javac, compiler regression iterable + captured type 29 * @modules jdk.compiler 30 * jdk.jdeps/com.sun.tools.javap 31 */ 32 33import java.io.PrintWriter; 34import java.io.StringWriter; 35import java.nio.file.Paths; 36import java.util.*; 37 38public class MethodRefDupInConstantPoolTest { 39 40 private static final String methodToLookFor = 41 "java/util/Vector.iterator:()Ljava/util/Iterator;"; 42 43 public static void main(String[] args) { 44 new MethodRefDupInConstantPoolTest().run(); 45 } 46 47 void run() { 48 check("-v", Paths.get(System.getProperty("test.classes"), 49 this.getClass().getSimpleName() + "$TestHelper1.class").toString()); 50 check("-v", Paths.get(System.getProperty("test.classes"), 51 this.getClass().getSimpleName() + "$TestHelper2.class").toString()); 52 check("-v", Paths.get(System.getProperty("test.classes"), 53 this.getClass().getSimpleName() + "$TestHelper3.class").toString()); 54 check("-v", Paths.get(System.getProperty("test.classes"), 55 this.getClass().getSimpleName() + "$TestHelper4.class").toString()); 56 } 57 58 void check(String... params) { 59 StringWriter s; 60 String out; 61 try (PrintWriter pw = new PrintWriter(s = new StringWriter())) { 62 com.sun.tools.javap.Main.run(params, pw); 63 out = s.toString(); 64 } 65 String constantPool = getConstantPool(out); 66 if (constantPool.indexOf(methodToLookFor) != 67 constantPool.lastIndexOf(methodToLookFor)) { 68 throw new AssertionError("There is more than one entry for the method seek " + 69 methodToLookFor); 70 } 71 } 72 73 String getConstantPool(String out) { 74 int start = out.indexOf("Constant pool:"); 75 int end = out.indexOf("{"); 76 return out.substring(start, end); 77 } 78 79 class TestHelper1 { 80 void m() { 81 Vector v = new Vector(); 82 Iterator iter = v.iterator(); 83 while (iter.hasNext()) { 84 Object o = iter.next(); 85 Object o2 = o; 86 } 87 for (Object o: v) { 88 Object o2 = o; 89 } 90 } 91 } 92 93 class TestHelper2<X extends Number & Iterable<String>> { 94 void test(X x) { 95 for (String s : x) { } 96 } 97 } 98 99 interface Data extends Iterable<String> {} 100 101 class TestHelper3<X extends Number & Iterable<? extends Data>> { 102 void test(X x) { 103 for (Data s : x) { } 104 } 105 } 106 107 class TestHelper4 { 108 void test(Iterable<? extends Data> t) { 109 for(Object a: t.iterator().next()); 110 } 111 } 112} 113