1 /*
   2  * Copyright (c) 2007, 2008, 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 package com.sun.tools.classfile;
  27 
  28 import java.io.IOException;
  29 
  30 /**
  31  * See JVMS, section 4.8.12.
  32  *
  33  *  <p><b>This is NOT part of any supported API.
  34  *  If you write code that depends on this, you do so at your own risk.
  35  *  This code and its internal interfaces are subject to change or
  36  *  deletion without notice.</b>
  37  */
  38 public class LineNumberTable_attribute extends Attribute {
  39     LineNumberTable_attribute(ClassReader cr, int name_index, int length) throws IOException {
  40         super(name_index, length);
  41         line_number_table_length = cr.readUnsignedShort();
  42         line_number_table = new Entry[line_number_table_length];
  43         for (int i = 0; i < line_number_table_length; i++)
  44             line_number_table[i] = new Entry(cr);
  45     }
  46 
  47     public LineNumberTable_attribute(ConstantPool constant_pool, Entry[] line_number_table)
  48             throws ConstantPoolException {
  49         this(constant_pool.getUTF8Index(Attribute.LineNumberTable), line_number_table);
  50     }
  51 
  52     public LineNumberTable_attribute(int name_index, Entry[] line_number_table) {
  53         super(name_index, 2 + line_number_table.length * Entry.length());
  54         this.line_number_table_length = line_number_table.length;
  55         this.line_number_table = line_number_table;
  56     }
  57 
  58     public <R, D> R accept(Visitor<R, D> visitor, D data) {
  59         return visitor.visitLineNumberTable(this, data);
  60     }
  61 
  62     public final int line_number_table_length;
  63     public final Entry[] line_number_table;
  64 
  65     public static class Entry {
  66         Entry(ClassReader cr) throws IOException {
  67             start_pc = cr.readUnsignedShort();
  68             line_number = cr.readUnsignedShort();
  69         }
  70 
  71         public static int length() {
  72             return 4;
  73         }
  74 
  75         public final int start_pc;
  76         public final int line_number;
  77     }
  78 }