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 /***
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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