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