1/* 2 * Copyright (c) 2013, 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 8011181 27 * @summary javac, empty UTF8 entry generated for inner class 28 * @modules jdk.jdeps/com.sun.tools.classfile 29 * jdk.compiler/com.sun.tools.javac.util 30 */ 31 32import java.io.BufferedInputStream; 33import java.nio.file.Files; 34import java.nio.file.Path; 35import java.nio.file.Paths; 36 37import com.sun.tools.javac.util.Assert; 38import com.sun.tools.classfile.ClassFile; 39 40import static com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8; 41import static com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8_info; 42import static com.sun.tools.classfile.ConstantPool.CPInfo; 43 44public class EmptyUTF8ForInnerClassNameTest { 45 46 public static void main(String[] args) throws Exception { 47 new EmptyUTF8ForInnerClassNameTest().run(); 48 } 49 50 void run() throws Exception { 51 checkClassFile(Paths.get(System.getProperty("test.classes"), 52 this.getClass().getName() + "$1.class")); 53 checkClassFile(Paths.get(System.getProperty("test.classes"), 54 this.getClass().getName() + "$EnumPlusSwitch.class")); 55 } 56 57 void checkClassFile(final Path path) throws Exception { 58 ClassFile classFile = ClassFile.read( 59 new BufferedInputStream(Files.newInputStream(path))); 60 for (CPInfo cpInfo : classFile.constant_pool.entries()) { 61 if (cpInfo.getTag() == CONSTANT_Utf8) { 62 CONSTANT_Utf8_info utf8Info = (CONSTANT_Utf8_info)cpInfo; 63 Assert.check(utf8Info.value.length() > 0, 64 "UTF8 with length 0 found at class " + classFile.getName()); 65 } 66 } 67 } 68 69 static class EnumPlusSwitch { 70 enum E {E1} 71 72 public int m (E e) { 73 switch (e) { 74 case E1: 75 return 0; 76 } 77 return -1; 78 } 79 } 80 81} 82