Source code

    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 */
    017package org.apache.bcel.generic;
    018
    019import org.apache.bcel.Const;
    020
    021/**
    022 * Super class for the family of arithmetic instructions.
    023 */
    024public abstract class ArithmeticInstruction extends Instruction implements TypedInstruction, StackProducer, StackConsumer {
    025
    026    /**
    027     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    028     */
    029    ArithmeticInstruction() {
    030    }
    031
    032    /**
    033     * @param opcode of instruction
    034     */
    035    protected ArithmeticInstruction(final short opcode) {
    036        super(opcode, (short) 1);
    037    }
    038
    039    /**
    040     * @return type associated with the instruction
    041     */
    042    @Override
    043    public Type getType(final ConstantPoolGen cp) {
    044        final short opcode = super.getOpcode();
    045        switch (opcode) {
    046        case Const.DADD:
    047        case Const.DDIV:
    048        case Const.DMUL:
    049        case Const.DNEG:
    050        case Const.DREM:
    051        case Const.DSUB:
    052            return Type.DOUBLE;
    053        case Const.FADD:
    054        case Const.FDIV:
    055        case Const.FMUL:
    056        case Const.FNEG:
    057        case Const.FREM:
    058        case Const.FSUB:
    059            return Type.FLOAT;
    060        case Const.IADD:
    061        case Const.IAND:
    062        case Const.IDIV:
    063        case Const.IMUL:
    064        case Const.INEG:
    065        case Const.IOR:
    066        case Const.IREM:
    067        case Const.ISHL:
    068        case Const.ISHR:
    069        case Const.ISUB:
    070        case Const.IUSHR:
    071        case Const.IXOR:
    072            return Type.INT;
    073        case Const.LADD:
    074        case Const.LAND:
    075        case Const.LDIV:
    076        case Const.LMUL:
    077        case Const.LNEG:
    078        case Const.LOR:
    079        case Const.LREM:
    080        case Const.LSHL:
    081        case Const.LSHR:
    082        case Const.LSUB:
    083        case Const.LUSHR:
    084        case Const.LXOR:
    085            return Type.LONG;
    086        default: // Never reached
    087            throw new ClassGenException("Unknown type " + opcode);
    088        }
    089    }
    090}