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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   */
30  public class GETSTATIC extends FieldInstruction implements PushInstruction, ExceptionThrower {
31  
32      /**
33       * Empty constructor needed for Instruction.readInstruction.
34       * Not to be used otherwise.
35       */
36      GETSTATIC() {
37      }
38  
39  
40      public GETSTATIC(final int index) {
41          super(Const.GETSTATIC, index);
42      }
43  
44  
45      @Override
46      public int produceStack( final ConstantPoolGen cpg ) {
47          return getFieldSize(cpg);
48      }
49  
50  
51      @Override
52      public Class<?>[] getExceptions() {
53          return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_FIELD_AND_METHOD_RESOLUTION,
54              ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR);
55      }
56  
57  
58      /**
59       * Call corresponding visitor method(s). The order is:
60       * Call visitor methods of implemented interfaces first, then
61       * call methods according to the class hierarchy in descending order,
62       * i.e., the most specific visitXXX() call comes last.
63       *
64       * @param v Visitor object
65       */
66      @Override
67      public void accept( final Visitor v ) {
68          v.visitStackProducer(this);
69          v.visitPushInstruction(this);
70          v.visitExceptionThrower(this);
71          v.visitTypedInstruction(this);
72          v.visitLoadClass(this);
73          v.visitCPInstruction(this);
74          v.visitFieldOrMethod(this);
75          v.visitFieldInstruction(this);
76          v.visitGETSTATIC(this);
77      }
78  }