    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 x2y family of instructions.
    023 */
    024public abstract class ConversionInstruction extends Instruction implements TypedInstruction, StackProducer, StackConsumer {
    025
    026    /**
    027     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    028     */
    029    ConversionInstruction() {
    030    }
    031
    032    /**
    033     * @param opcode opcode of instruction
    034     */
    035    protected ConversionInstruction(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.D2I:
    047        case Const.F2I:
    048        case Const.L2I:
    049            return Type.INT;
    050        case Const.D2F:
    051        case Const.I2F:
    052        case Const.L2F:
    053            return Type.FLOAT;
    054        case Const.D2L:
    055        case Const.F2L:
    056        case Const.I2L:
    057            return Type.LONG;
    058        case Const.F2D:
    059        case Const.I2D:
    060        case Const.L2D:
    061            return Type.DOUBLE;
    062        case Const.I2B:
    063            return Type.BYTE;
    064        case Const.I2C:
    065            return Type.CHAR;
    066        case Const.I2S:
    067            return Type.SHORT;
    068        default: // Never reached
    069            throw new ClassGenException("Unknown type " + opcode);
    070        }
    071    }
    072}