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.Const;
021
022/**
023 * Super class for the family of arithmetic instructions.
024 *
025 */
026public abstract class ArithmeticInstruction extends Instruction implements TypedInstruction, StackProducer, StackConsumer {
027
028    /**
029     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
030     */
031    ArithmeticInstruction() {
032    }
033
034    /**
035     * @param opcode of instruction
036     */
037    protected ArithmeticInstruction(final short opcode) {
038        super(opcode, (short) 1);
039    }
040
041    /**
042     * @return type associated with the instruction
043     */
044    @Override
045    public Type getType(final ConstantPoolGen cp) {
046        final short opcode = super.getOpcode();
047        switch (opcode) {
048        case Const.DADD:
049        case Const.DDIV:
050        case Const.DMUL:
051        case Const.DNEG:
052        case Const.DREM:
053        case Const.DSUB:
054            return Type.DOUBLE;
055        case Const.FADD:
056        case Const.FDIV:
057        case Const.FMUL:
058        case Const.FNEG:
059        case Const.FREM:
060        case Const.FSUB:
061            return Type.FLOAT;
062        case Const.IADD:
063        case Const.IAND:
064        case Const.IDIV:
065        case Const.IMUL:
066        case Const.INEG:
067        case Const.IOR:
068        case Const.IREM:
069        case Const.ISHL:
070        case Const.ISHR:
071        case Const.ISUB:
072        case Const.IUSHR:
073        case Const.IXOR:
074            return Type.INT;
075        case Const.LADD:
076        case Const.LAND:
077        case Const.LDIV:
078        case Const.LMUL:
079        case Const.LNEG:
080        case Const.LOR:
081        case Const.LREM:
082        case Const.LSHL:
083        case Const.LSHR:
084        case Const.LSUB:
085        case Const.LUSHR:
086        case Const.LXOR:
087            return Type.LONG;
088        default: // Never reached
089            throw new ClassGenException("Unknown type " + opcode);
090        }
091    }
092}