    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 *   https://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.bcel.generic;
    020
    021import org.apache.bcel.Const;
    022
    023/**
    024 * Super class for the x2y family of instructions.
    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     * Constructs a ConversionInstruction.
    036     *
    037     * @param opcode opcode of instruction.
    038     */
    039    protected ConversionInstruction(final short opcode) {
    040        super(opcode, (short) 1);
    041    }
    042
    043    /**
    044     * @return type associated with the instruction.
    045     */
    046    @Override
    047    public Type getType(final ConstantPoolGen cp) {
    048        final short opcode = super.getOpcode();
    049        switch (opcode) {
    050        case Const.D2I:
    051        case Const.F2I:
    052        case Const.L2I:
    053            return Type.INT;
    054        case Const.D2F:
    055        case Const.I2F:
    056        case Const.L2F:
    057            return Type.FLOAT;
    058        case Const.D2L:
    059        case Const.F2L:
    060        case Const.I2L:
    061            return Type.LONG;
    062        case Const.F2D:
    063        case Const.I2D:
    064        case Const.L2D:
    065            return Type.DOUBLE;
    066        case Const.I2B:
    067            return Type.BYTE;
    068        case Const.I2C:
    069            return Type.CHAR;
    070        case Const.I2S:
    071            return Type.SHORT;
    072        default: // Never reached
    073            throw new ClassGenException("Unknown type " + opcode);
    074        }
    075    }
    076}