1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements.  See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License.  You may obtain a copy of the License at
8  *
9  *      http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  */
18 package org.apache.bcel.generic;
19 
20 import org.apache.bcel.Const;
21 import org.apache.bcel.ExceptionConst;
22 
23 /**
24  * GETSTATIC - Fetch static field from class
25  * <PRE>Stack: ..., -&gt; ..., value</PRE>
26  * OR
27  * <PRE>Stack: ..., -&gt; ..., value.word1, value.word2</PRE>
28  *
29  * @version $Id$
30  */
31 public class GETSTATIC extends FieldInstruction implements PushInstruction, ExceptionThrower {
32 
33     /**
34      * Empty constructor needed for Instruction.readInstruction.
35      * Not to be used otherwise.
36      */
GETSTATIC()37     GETSTATIC() {
38     }
39 
40 
GETSTATIC(final int index)41     public GETSTATIC(final int index) {
42         super(Const.GETSTATIC, index);
43     }
44 
45 
46     @Override
produceStack( final ConstantPoolGen cpg )47     public int produceStack( final ConstantPoolGen cpg ) {
48         return getFieldSize(cpg);
49     }
50 
51 
52     @Override
getExceptions()53     public Class<?>[] getExceptions() {
54         return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_FIELD_AND_METHOD_RESOLUTION,
55             ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR);
56     }
57 
58 
59     /**
60      * Call corresponding visitor method(s). The order is:
61      * Call visitor methods of implemented interfaces first, then
62      * call methods according to the class hierarchy in descending order,
63      * i.e., the most specific visitXXX() call comes last.
64      *
65      * @param v Visitor object
66      */
67     @Override
accept( final Visitor v )68     public void accept( final Visitor v ) {
69         v.visitStackProducer(this);
70         v.visitPushInstruction(this);
71         v.visitExceptionThrower(this);
72         v.visitTypedInstruction(this);
73         v.visitLoadClass(this);
74         v.visitCPInstruction(this);
75         v.visitFieldOrMethod(this);
76         v.visitFieldInstruction(this);
77         v.visitGETSTATIC(this);
78     }
79 }
80