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.  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 8061778
  29  * @summary  Wrong LineNumberTable for default constructors
  30  * @modules jdk.jdeps/com.sun.tools.classfile
  31  */
  32 
  33 import com.sun.tools.classfile.ClassFile;
  34 import com.sun.tools.classfile.ConstantPoolException;
  35 import com.sun.tools.classfile.Method;
  36 import com.sun.tools.classfile.Attribute;
  37 import com.sun.tools.classfile.Code_attribute;
  38 import com.sun.tools.classfile.LineNumberTable_attribute;
  39 import com.sun.tools.classfile.LineNumberTable_attribute.Entry;
  40 
  41 import java.io.IOException;
  42 
  43 public class NestedLineNumberTest {
  44 
  45     public static void main(String[] args) throws Exception {
  46         Entry[] lines = findEntries();
  47         if (lines == null || lines.length != 1) {
  48             int found = lines == null ? 0 : lines.length;
  49             error(String.format("LineNumberTable contains wrong number of entries - expected %d, found %d", 1, found));
  50         }
  51 
  52         int line = lines[0].line_number;
  53         if (line != 79) {
  54             error(String.format("LineNumberTable contains wrong line number - expected %d, found %d", 79, line));
  55         }
  56     }
  57 
  58     static Entry[] findEntries() throws IOException, ConstantPoolException {
  59         ClassFile self = ClassFile.read(NestedLineNumberTest.Test.class.getResourceAsStream("NestedLineNumberTest$Test.class"));
  60         for (Method m : self.methods) {
  61             if ("<init>".equals(m.getName(self.constant_pool))) {
  62                 Code_attribute code_attribute = (Code_attribute)m.attributes.get(Attribute.Code);
  63                 for (Attribute at : code_attribute.attributes) {
  64                     if (Attribute.LineNumberTable.equals(at.getName(self.constant_pool))) {
  65                         return ((LineNumberTable_attribute)at).line_number_table;
  66                     }
  67                 }
  68             }
  69         }
  70         return null;
  71     }
  72 
  73     static void error(String msg) {
  74         throw new AssertionError(msg);
  75     }
  76 
  77     // The default constructor in this class should get only one LineNumberTable entry,
  78     // pointing to the first line of the declaration of class Test.
  79     static class Test {
  80         static class Empty { }
  81     }
  82 }