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