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 * @version $Id: ConversionInstruction.java 1747278 2016-06-07 17:28:43Z britter $
026 */
027public abstract class ConversionInstruction extends Instruction implements TypedInstruction,
028        StackProducer, StackConsumer {
029
030    /**
031     * Empty constructor needed for the Class.newInstance() statement in
032     * Instruction.readInstruction(). Not to be used otherwise.
033     */
034    ConversionInstruction() {
035    }
036
037
038    /**
039     * @param opcode opcode of instruction
040     */
041    protected ConversionInstruction(final short opcode) {
042        super(opcode, (short) 1);
043    }
044
045
046    /** @return type associated with the instruction
047     */
048    @Override
049    public Type getType( final ConstantPoolGen cp ) {
050        final short _opcode = super.getOpcode();
051        switch (_opcode) {
052            case Const.D2I:
053            case Const.F2I:
054            case Const.L2I:
055                return Type.INT;
056            case Const.D2F:
057            case Const.I2F:
058            case Const.L2F:
059                return Type.FLOAT;
060            case Const.D2L:
061            case Const.F2L:
062            case Const.I2L:
063                return Type.LONG;
064            case Const.F2D:
065            case Const.I2D:
066            case Const.L2D:
067                return Type.DOUBLE;
068            case Const.I2B:
069                return Type.BYTE;
070            case Const.I2C:
071                return Type.CHAR;
072            case Const.I2S:
073                return Type.SHORT;
074            default: // Never reached
075                throw new ClassGenException("Unknown type " + _opcode);
076        }
077    }
078}