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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  package org.apache.bcel.generic;
18  
19  /**
20   * Denotes an unparameterized instruction to load a value from a local variable, e.g. ILOAD.
21   */
22  public abstract class LoadInstruction extends LocalVariableInstruction implements PushInstruction {
23  
24      /**
25       * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. tag and length are defined in
26       * readInstruction and initFromFile, respectively.
27       */
28      LoadInstruction(final short canonTag, final short cTag) {
29          super(canonTag, cTag);
30      }
31  
32      /**
33       * @param opcode Instruction opcode
34       * @param cTag Instruction number for compact version, ALOAD_0, e.g.
35       * @param n local variable index (unsigned short)
36       */
37      protected LoadInstruction(final short opcode, final short cTag, final int n) {
38          super(opcode, cTag, n);
39      }
40  
41      /**
42       * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
43       * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
44       *
45       * @param v Visitor object
46       */
47      @Override
48      public void accept(final Visitor v) {
49          v.visitStackProducer(this);
50          v.visitPushInstruction(this);
51          v.visitTypedInstruction(this);
52          v.visitLocalVariableInstruction(this);
53          v.visitLoadInstruction(this);
54      }
55  }