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 /**
22 * Denotes an unparameterized instruction to load a value from a local variable, for example ILOAD.
23 */
24 public abstract class LoadInstruction extends LocalVariableInstruction implements PushInstruction {
25
26 /**
27 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. tag and length are defined in
28 * readInstruction and initFromFile, respectively.
29 */
30 LoadInstruction(final short canonTag, final short cTag) {
31 super(canonTag, cTag);
32 }
33
34 /**
35 * Constructs a LoadInstruction.
36 *
37 * @param opcode Instruction opcode.
38 * @param cTag Instruction number for compact version, ALOAD_0, for example.
39 * @param n local variable index (unsigned short).
40 */
41 protected LoadInstruction(final short opcode, final short cTag, final int n) {
42 super(opcode, cTag, n);
43 }
44
45 /**
46 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
47 * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
48 *
49 * @param v Visitor object.
50 */
51 @Override
52 public void accept(final Visitor v) {
53 v.visitStackProducer(this);
54 v.visitPushInstruction(this);
55 v.visitTypedInstruction(this);
56 v.visitLocalVariableInstruction(this);
57 v.visitLoadInstruction(this);
58 }
59 }