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      1 /* Copyright (C) 2003 Vladimir Roubtsov. All rights reserved.
      2  *
      3  * This program and the accompanying materials are made available under
      4  * the terms of the Common Public License v1.0 which accompanies this distribution,
      5  * and is available at http://www.eclipse.org/legal/cpl-v10.html
      6  *
      7  * $Id: LineNumber_info.java,v 1.1.1.1 2004/05/09 16:57:48 vlad_r Exp $
      8  */
      9 package com.vladium.jcd.cls.attribute;
     10 
     11 import java.io.IOException;
     12 
     13 import com.vladium.jcd.compiler.IClassFormatOutput;
     14 import com.vladium.jcd.lib.UDataInputStream;
     15 import com.vladium.jcd.lib.UDataOutputStream;
     16 
     17 // ----------------------------------------------------------------------------
     18 /**
     19  * This class represents a line_number_table entry contained by
     20  * {@link LineNumberTableAttribute_info} attribute. Each entry contains the
     21  * following items:
     22  * <PRE>
     23  *    start_pc
     24  * </PRE>
     25  * The value of the start_pc item must indicate the index into the code array
     26  * at which the code for a new line in the original source file begins. The
     27  * value of start_pc must be less than the value of the code_length item of
     28  * the {@link CodeAttribute_info} attribute of which this LineNumberTable
     29  * is an attribute.<P>
     30  * <PRE>
     31  *    line_number
     32  * </PRE>
     33  * The value of the line_number item must give the corresponding line number
     34  * in the original source file.
     35  *
     36  * @author Vlad Roubtsov, (C) 2003
     37  */
     38 public
     39 final class LineNumber_info implements Cloneable, IClassFormatOutput
     40 {
     41     // public: ................................................................
     42 
     43     public int m_start_pc, m_line_number;
     44 
     45 
     46     public LineNumber_info (final int start_pc, final int line_number)
     47     {
     48         m_start_pc = start_pc;
     49         m_line_number = line_number;
     50     }
     51 
     52     public String toString ()
     53     {
     54         return "line_number_info: [start_pc = " + m_start_pc + ", line_number = " + m_line_number + "]";
     55     }
     56 
     57     // Cloneable:
     58 
     59     /**
     60      * Performs a deep copy.
     61      */
     62     public Object clone ()
     63     {
     64         try
     65         {
     66             return super.clone ();
     67         }
     68         catch (CloneNotSupportedException e)
     69         {
     70             throw new InternalError (e.toString ());
     71         }
     72     }
     73 
     74     // IClassFormatOutput:
     75 
     76     public void writeInClassFormat (final UDataOutputStream out) throws IOException
     77     {
     78         out.writeU2 (m_start_pc);
     79         out.writeU2 (m_line_number);
     80     }
     81 
     82     // protected: .............................................................
     83 
     84     // package: ...............................................................
     85 
     86 
     87     LineNumber_info (final UDataInputStream bytes) throws IOException
     88     {
     89         m_start_pc = bytes.readU2 ();
     90         m_line_number = bytes.readU2 ();
     91     }
     92 
     93     // private: ...............................................................
     94 
     95 } // end of class
     96 // ----------------------------------------------------------------------------