    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 x2y family of instructions.
    024 *
    025 */
    026public abstract class ConversionInstruction extends Instruction implements TypedInstruction, StackProducer, StackConsumer {
    027
    028    /**
    029     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    030     */
    031    ConversionInstruction() {
    032    }
    033
    034    /**
    035     * @param opcode opcode of instruction
    036     */
    037    protected ConversionInstruction(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.D2I:
    049        case Const.F2I:
    050        case Const.L2I:
    051            return Type.INT;
    052        case Const.D2F:
    053        case Const.I2F:
    054        case Const.L2F:
    055            return Type.FLOAT;
    056        case Const.D2L:
    057        case Const.F2L:
    058        case Const.I2L:
    059            return Type.LONG;
    060        case Const.F2D:
    061        case Const.I2D:
    062        case Const.L2D:
    063            return Type.DOUBLE;
    064        case Const.I2B:
    065            return Type.BYTE;
    066        case Const.I2C:
    067            return Type.CHAR;
    068        case Const.I2S:
    069            return Type.SHORT;
    070        default: // Never reached
    071            throw new ClassGenException("Unknown type " + opcode);
    072        }
    073    }
    074}