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 * @version $Id: ArithmeticInstruction.java 1812166 2017-10-13 23:48:11Z ggregory $
026 */
027public abstract class ArithmeticInstruction extends Instruction implements TypedInstruction,
028        StackProducer, StackConsumer {
029
030    /**
031     * Empty constructor needed for Instruction.readInstruction.
032     * Not to be used otherwise.
033     */
034    ArithmeticInstruction() {
035    }
036
037
038    /**
039     * @param opcode of instruction
040     */
041    protected ArithmeticInstruction(final short opcode) {
042        super(opcode, (short) 1);
043    }
044
045
046    /** @return type associated with the instruction
047     */
048    @Override
049    public Type getType( final ConstantPoolGen cp ) {
050        final short _opcode = super.getOpcode();
051        switch (_opcode) {
052            case Const.DADD:
053            case Const.DDIV:
054            case Const.DMUL:
055            case Const.DNEG:
056            case Const.DREM:
057            case Const.DSUB:
058                return Type.DOUBLE;
059            case Const.FADD:
060            case Const.FDIV:
061            case Const.FMUL:
062            case Const.FNEG:
063            case Const.FREM:
064            case Const.FSUB:
065                return Type.FLOAT;
066            case Const.IADD:
067            case Const.IAND:
068            case Const.IDIV:
069            case Const.IMUL:
070            case Const.INEG:
071            case Const.IOR:
072            case Const.IREM:
073            case Const.ISHL:
074            case Const.ISHR:
075            case Const.ISUB:
076            case Const.IUSHR:
077            case Const.IXOR:
078                return Type.INT;
079            case Const.LADD:
080            case Const.LAND:
081            case Const.LDIV:
082            case Const.LMUL:
083            case Const.LNEG:
084            case Const.LOR:
085            case Const.LREM:
086            case Const.LSHL:
087            case Const.LSHR:
088            case Const.LSUB:
089            case Const.LUSHR:
090            case Const.LXOR:
091                return Type.LONG;
092            default: // Never reached
093                throw new ClassGenException("Unknown type " + _opcode);
094        }
095    }
096}