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.ExceptionConst;
22
23 /**
24 * Super class for instructions dealing with array access such as IALOAD.
25 */
26 public abstract class ArrayInstruction extends Instruction implements ExceptionThrower, TypedInstruction {
27
28 /**
29 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
30 */
31 ArrayInstruction() {
32 }
33
34 /**
35 * Constructs an ArrayInstruction.
36 *
37 * @param opcode of instruction.
38 */
39 protected ArrayInstruction(final short opcode) {
40 super(opcode, (short) 1);
41 }
42
43 @Override
44 public Class<?>[] getExceptions() {
45 return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_ARRAY_EXCEPTION);
46 }
47
48 /**
49 * @return type associated with the instruction.
50 */
51 @Override
52 public Type getType(final ConstantPoolGen cp) {
53 final short opcode = super.getOpcode();
54 switch (opcode) {
55 case org.apache.bcel.Const.IALOAD:
56 case org.apache.bcel.Const.IASTORE:
57 return Type.INT;
58 case org.apache.bcel.Const.CALOAD:
59 case org.apache.bcel.Const.CASTORE:
60 return Type.CHAR;
61 case org.apache.bcel.Const.BALOAD:
62 case org.apache.bcel.Const.BASTORE:
63 return Type.BYTE;
64 case org.apache.bcel.Const.SALOAD:
65 case org.apache.bcel.Const.SASTORE:
66 return Type.SHORT;
67 case org.apache.bcel.Const.LALOAD:
68 case org.apache.bcel.Const.LASTORE:
69 return Type.LONG;
70 case org.apache.bcel.Const.DALOAD:
71 case org.apache.bcel.Const.DASTORE:
72 return Type.DOUBLE;
73 case org.apache.bcel.Const.FALOAD:
74 case org.apache.bcel.Const.FASTORE:
75 return Type.FLOAT;
76 case org.apache.bcel.Const.AALOAD:
77 case org.apache.bcel.Const.AASTORE:
78 return Type.OBJECT;
79 default:
80 throw new ClassGenException("Unknown case in switch" + opcode);
81 }
82 }
83 }