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    1   package org.apache.bcel.generic;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
    15   *
    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
    29   *    "Apache BCEL" must not be used to endorse or promote products
    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    "Apache BCEL", nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    48   * SUCH DAMAGE.
    49   * ====================================================================
    50   *
    51   * This software consists of voluntary contributions made by many
    52   * individuals on behalf of the Apache Software Foundation.  For more
    53   * information on the Apache Software Foundation, please see
    54   * <http://www.apache.org/>;.
    55   */
    56
    57  import org.apache.bcel.Constants;
    58  import org.apache.bcel.classfile.*;
    59
    60  /***
    61   * This class represents a line number within a method, i.e., give an instruction
    62   * a line number corresponding to the source code line.
    63   *
    64   * @version $Id: LineNumberGen.java,v 1.3 2002/07/11 19:39:04 mdahm Exp $
    65   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
    66   * @see     LineNumber
    67   * @see     MethodGen
    68   */
    69  public class LineNumberGen
    70    implements InstructionTargeter, Cloneable, java.io.Serializable
    71  {
    72    private InstructionHandle ih;
    73    private int               src_line;
    74
    75    /***
    76     * Create a line number.
    77     *
    78     * @param ih instruction handle to reference
    79     */
    80    public LineNumberGen(InstructionHandle ih, int src_line) {
    81      setInstruction(ih);
    82      setSourceLine(src_line);
    83    }
    84
    85    /***
    86     * @return true, if ih is target of this line number
    87     */
    88    public boolean containsTarget(InstructionHandle ih) {
    89      return this.ih == ih;
    90    }
    91
    92    /***
    93     * @param old_ih old target
    94     * @param new_ih new target
    95     */
    96    public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
    97      if(old_ih != ih)
    98        throw new ClassGenException("Not targeting " + old_ih + ", but " + ih + "}");
    99      else
    100       setInstruction(new_ih);
    101   }
    102
    103   /***
    104    * Get LineNumber attribute .
    105    *
    106    * This relies on that the instruction list has already been dumped to byte code or
    107    * or that the `setPositions' methods has been called for the instruction list.
    108    */
    109   public LineNumber getLineNumber() {
    110     return new LineNumber(ih.getPosition(), src_line);
    111   }
    112
    113   public void setInstruction(InstructionHandle ih) {
    114     BranchInstruction.notifyTarget(this.ih, ih, this);
    115
    116     this.ih = ih;
    117   }
    118
    119   public Object clone() {
    120     try {
    121       return super.clone();
    122     } catch(CloneNotSupportedException e) {
    123       System.err.println(e);
    124       return null;
    125     }
    126   }
    127
    128   public InstructionHandle getInstruction()               { return ih; }
    129   public void              setSourceLine(int src_line)    { this.src_line = src_line; }
    130   public int               getSourceLine()                { return src_line; }
    131 }

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