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Java > Open Source Codes > org > apache > bcel > generic > LoadInstruction


1 /*
2  * Copyright 2000-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.bcel.generic;
18
19 /**
20  * Denotes an unparameterized instruction to load a value from a local
21  * variable, e.g. ILOAD.
22  *
23  * @version $Id: LoadInstruction.java 386056 2006-03-15 11:31:56Z tcurdt $
24  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
25  */
26 public abstract class LoadInstruction extends LocalVariableInstruction implements PushInstruction {
27
28     /**
29      * Empty constructor needed for the Class.newInstance() statement in
30      * Instruction.readInstruction(). Not to be used otherwise.
31      * tag and length are defined in readInstruction and initFromFile, respectively.
32      */
33     LoadInstruction(short canon_tag, short c_tag) {
34         super(canon_tag, c_tag);
35     }
36
37
38     /**
39      * @param opcode Instruction opcode
40      * @param c_tag Instruction number for compact version, ALOAD_0, e.g.
41      * @param n local variable index (unsigned short)
42      */
43     protected LoadInstruction(short opcode, short c_tag, int n) {
44         super(opcode, c_tag, n);
45     }
46
47
48     /**
49      * Call corresponding visitor method(s). The order is:
50      * Call visitor methods of implemented interfaces first, then
51      * call methods according to the class hierarchy in descending order,
52      * i.e., the most specific visitXXX() call comes last.
53      *
54      * @param v Visitor object
55      */
56     public void accept( Visitor v ) {
57         v.visitStackProducer(this);
58         v.visitPushInstruction(this);
59         v.visitTypedInstruction(this);
60         v.visitLocalVariableInstruction(this);
61         v.visitLoadInstruction(this);
62     }
63 }
64
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