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
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43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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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  /***
58   * Denotes an unparameterized instruction to load a value from a local
59   * variable, e.g. ILOAD.
60   *
61   * @version $Id: LoadInstruction.java,v 1.1.1.1 2001/10/29 20:00:23 jvanzyl Exp $
62   * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
63   */
64  public abstract class LoadInstruction extends LocalVariableInstruction
65    implements PushInstruction
66  {
67    /***
68     * Empty constructor needed for the Class.newInstance() statement in
69     * Instruction.readInstruction(). Not to be used otherwise.
70     * tag and length are defined in readInstruction and initFromFile, respectively.
71     */
72    LoadInstruction(short canon_tag, short c_tag) {
73      super(canon_tag, c_tag);
74    }
75  
76    /***
77     * @param opcode Instruction opcode
78     * @param c_tag Instruction number for compact version, ALOAD_0, e.g.
79     * @param n local variable index (unsigned short)
80     */
81    protected LoadInstruction(short opcode, short c_tag, int n) {
82      super(opcode, c_tag, n);
83    }
84  
85    /***
86     * Call corresponding visitor method(s). The order is:
87     * Call visitor methods of implemented interfaces first, then
88     * call methods according to the class hierarchy in descending order,
89     * i.e., the most specific visitXXX() call comes last.
90     *
91     * @param v Visitor object
92     */
93    public void accept(Visitor v) {
94      v.visitStackProducer(this);
95      v.visitPushInstruction(this);
96      v.visitTypedInstruction(this);
97      v.visitLocalVariableInstruction(this);
98      v.visitLoadInstruction(this);
99    }
100 }
101 
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