001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 *
017 */
018package org.apache.bcel.generic;
019
020import org.apache.bcel.ExceptionConst;
021
022/**
023 * Super class for instructions dealing with array access such as IALOAD.
024 *
025 */
026public abstract class ArrayInstruction extends Instruction implements ExceptionThrower, TypedInstruction {
027
028    /**
029     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
030     */
031    ArrayInstruction() {
032    }
033
034    /**
035     * @param opcode of instruction
036     */
037    protected ArrayInstruction(final short opcode) {
038        super(opcode, (short) 1);
039    }
040
041    @Override
042    public Class<?>[] getExceptions() {
043        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_ARRAY_EXCEPTION);
044    }
045
046    /**
047     * @return type associated with the instruction
048     */
049    @Override
050    public Type getType(final ConstantPoolGen cp) {
051        final short opcode = super.getOpcode();
052        switch (opcode) {
053        case org.apache.bcel.Const.IALOAD:
054        case org.apache.bcel.Const.IASTORE:
055            return Type.INT;
056        case org.apache.bcel.Const.CALOAD:
057        case org.apache.bcel.Const.CASTORE:
058            return Type.CHAR;
059        case org.apache.bcel.Const.BALOAD:
060        case org.apache.bcel.Const.BASTORE:
061            return Type.BYTE;
062        case org.apache.bcel.Const.SALOAD:
063        case org.apache.bcel.Const.SASTORE:
064            return Type.SHORT;
065        case org.apache.bcel.Const.LALOAD:
066        case org.apache.bcel.Const.LASTORE:
067            return Type.LONG;
068        case org.apache.bcel.Const.DALOAD:
069        case org.apache.bcel.Const.DASTORE:
070            return Type.DOUBLE;
071        case org.apache.bcel.Const.FALOAD:
072        case org.apache.bcel.Const.FASTORE:
073            return Type.FLOAT;
074        case org.apache.bcel.Const.AALOAD:
075        case org.apache.bcel.Const.AASTORE:
076            return Type.OBJECT;
077        default:
078            throw new ClassGenException("Unknown case in switch" + opcode);
079        }
080    }
081}