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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /*
  27  * @test
  28  * @bug 8011181
  29  * @summary javac, empty UTF8 entry generated for inner class
  30  * @modules jdk.compiler/com.sun.tools.classfile
  31  *          jdk.compiler/com.sun.tools.javac.util
  32  */
  33 
  34 import java.io.BufferedInputStream;
  35 import java.nio.file.Files;
  36 import java.nio.file.Path;
  37 import java.nio.file.Paths;
  38 
  39 import com.sun.tools.javac.util.Assert;
  40 import com.sun.tools.classfile.ClassFile;
  41 
  42 import static com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8;
  43 import static com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8_info;
  44 import static com.sun.tools.classfile.ConstantPool.CPInfo;
  45 
  46 public class EmptyUTF8ForInnerClassNameTest {
  47 
  48     public static void main(String[] args) throws Exception {
  49         new EmptyUTF8ForInnerClassNameTest().run();
  50     }
  51 
  52     void run() throws Exception {
  53         checkClassFile(Paths.get(System.getProperty("test.classes"),
  54                 this.getClass().getName() + "$1.class"));
  55         checkClassFile(Paths.get(System.getProperty("test.classes"),
  56                 this.getClass().getName() + "$EnumPlusSwitch.class"));
  57     }
  58 
  59     void checkClassFile(final Path path) throws Exception {
  60         ClassFile classFile = ClassFile.read(
  61                 new BufferedInputStream(Files.newInputStream(path)));
  62         for (CPInfo cpInfo : classFile.constant_pool.entries()) {
  63             if (cpInfo.getTag() == CONSTANT_Utf8) {
  64                 CONSTANT_Utf8_info utf8Info = (CONSTANT_Utf8_info)cpInfo;
  65                 Assert.check(utf8Info.value.length() > 0,
  66                         "UTF8 with length 0 found at class " + classFile.getName());
  67             }
  68         }
  69     }
  70 
  71     static class EnumPlusSwitch {
  72         enum E {E1}
  73 
  74         public int m (E e) {
  75             switch (e) {
  76                 case E1:
  77                     return 0;
  78             }
  79             return -1;
  80         }
  81     }
  82 
  83 }