Source code

    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 java.io.DataOutputStream;
    020import java.io.IOException;
    021
    022import org.apache.bcel.ExceptionConst;
    023import org.apache.bcel.util.ByteSequence;
    024
    025/**
    026 * NEWARRAY - Create new array of basic type (int, short, ...)
    027 *
    028 * <PRE>
    029 * Stack: ..., count -&gt; ..., arrayref
    030 * </PRE>
    031 *
    032 * type must be one of T_INT, T_SHORT, ...
    033 */
    034public class NEWARRAY extends Instruction implements AllocationInstruction, ExceptionThrower, StackProducer {
    035
    036    private byte type;
    037
    038    /**
    039     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    040     */
    041    NEWARRAY() {
    042    }
    043
    044    public NEWARRAY(final BasicType type) {
    045        this(type.getType());
    046    }
    047
    048    public NEWARRAY(final byte type) {
    049        super(org.apache.bcel.Const.NEWARRAY, (short) 2);
    050        this.type = type;
    051    }
    052
    053    /**
    054     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    055     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
    056     *
    057     * @param v Visitor object
    058     */
    059    @Override
    060    public void accept(final Visitor v) {
    061        v.visitAllocationInstruction(this);
    062        v.visitExceptionThrower(this);
    063        v.visitStackProducer(this);
    064        v.visitNEWARRAY(this);
    065    }
    066
    067    /**
    068     * Dump instruction as byte code to stream out.
    069     *
    070     * @param out Output stream
    071     */
    072    @Override
    073    public void dump(final DataOutputStream out) throws IOException {
    074        out.writeByte(super.getOpcode());
    075        out.writeByte(type);
    076    }
    077
    078    @Override
    079    public Class<?>[] getExceptions() {
    080        return new Class[] {ExceptionConst.NEGATIVE_ARRAY_SIZE_EXCEPTION};
    081    }
    082
    083    /**
    084     * @return type of constructed array
    085     */
    086    public final Type getType() {
    087        return new ArrayType(BasicType.getType(type), 1);
    088    }
    089
    090    /**
    091     * @return numeric code for basic element type
    092     */
    093    public final byte getTypecode() {
    094        return type;
    095    }
    096
    097    /**
    098     * Read needed data (e.g. index) from file.
    099     */
    100    @Override
    101    protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
    102        type = bytes.readByte();
    103        super.setLength(2);
    104    }
    105
    106    /**
    107     * @return mnemonic for instruction
    108     */
    109    @Override
    110    public String toString(final boolean verbose) {
    111        return super.toString(verbose) + " " + org.apache.bcel.Const.getTypeName(type);
    112    }
    113}