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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  import java.io.*;
    57  import org.apache.bcel.util.ByteSequence;
    58
    59  /***
    60   * TABLESWITCH - Switch within given range of values, i.e., low..high
    61   *
    62   * @version $Id: TABLESWITCH.java,v 1.1.1.1 2001/10/29 20:00:27 jvanzyl Exp $
    63   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
    64   * @see SWITCH
    65   */
    66  public class TABLESWITCH extends Select {
    67    /***
    68     * Empty constructor needed for the Class.newInstance() statement in
    69     * Instruction.readInstruction(). Not to be used otherwise.
    70     */
    71    TABLESWITCH() {}
    72
    73    /***
    74     * @param match sorted array of match values, match[0] must be low value,
    75     * match[match_length - 1] high value
    76     * @param targets where to branch for matched values
    77     * @param target default branch
    78     */
    79    public TABLESWITCH(int[] match, InstructionHandle[] targets,
    80  		     InstructionHandle target) {
    81      super(org.apache.bcel.Constants.TABLESWITCH, match, targets, target);
    82
    83      length = (short)(13 + match_length * 4); /* Alignment remainder assumed
    84  					      * 0 here, until dump time */
    85      fixed_length = length;
    86    }
    87
    88    /***
    89     * Dump instruction as byte code to stream out.
    90     * @param out Output stream
    91     */
    92    public void dump(DataOutputStream out) throws IOException {
    93      super.dump(out);
    94
    95      int low = (match_length > 0)? match[0] : 0;
    96      out.writeInt(low);
    97
    98      int high = (match_length > 0)? match[match_length - 1] : 0;
    99      out.writeInt(high);
    100
    101     for(int i=0; i < match_length; i++)     // jump offsets
    102       out.writeInt(indices[i] = getTargetOffset(targets[i]));
    103   }
    104
    105   /***
    106    * Read needed data (e.g. index) from file.
    107    */
    108   protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
    109   {
    110     super.initFromFile(bytes, wide);
    111
    112     int low    = bytes.readInt();
    113     int high   = bytes.readInt();
    114
    115     match_length = high - low + 1;
    116     fixed_length = (short)(13 + match_length * 4);
    117     length       = (short)(fixed_length + padding);
    118
    119     match   = new int[match_length];
    120     indices = new int[match_length];
    121     targets = new InstructionHandle[match_length];
    122
    123     for(int i=low; i <= high; i++)
    124       match[i - low] = i;
    125
    126     for(int i=0; i < match_length; i++) {
    127       indices[i] = bytes.readInt();
    128     }
    129   }
    130
    131
    132   /***
    133    * Call corresponding visitor method(s). The order is:
    134    * Call visitor methods of implemented interfaces first, then
    135    * call methods according to the class hierarchy in descending order,
    136    * i.e., the most specific visitXXX() call comes last.
    137    *
    138    * @param v Visitor object
    139    */
    140   public void accept(Visitor v) {
    141     v.visitVariableLengthInstruction(this);
    142     v.visitStackProducer(this);
    143     v.visitBranchInstruction(this);
    144     v.visitSelect(this);
    145     v.visitTABLESWITCH(this);
    146   }
    147 }

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