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,
027        StackProducer, StackConsumer {
028
029    /**
030     * Empty constructor needed for Instruction.readInstruction.
031     * Not to be used otherwise.
032     */
033    ConversionInstruction() {
034    }
035
036
037    /**
038     * @param opcode opcode of instruction
039     */
040    protected ConversionInstruction(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.D2I:
052            case Const.F2I:
053            case Const.L2I:
054                return Type.INT;
055            case Const.D2F:
056            case Const.I2F:
057            case Const.L2F:
058                return Type.FLOAT;
059            case Const.D2L:
060            case Const.F2L:
061            case Const.I2L:
062                return Type.LONG;
063            case Const.F2D:
064            case Const.I2D:
065            case Const.L2D:
066                return Type.DOUBLE;
067            case Const.I2B:
068                return Type.BYTE;
069            case Const.I2C:
070                return Type.CHAR;
071            case Const.I2S:
072                return Type.SHORT;
073            default: // Never reached
074                throw new ClassGenException("Unknown type " + _opcode);
075        }
076    }
077}