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.classfile.ConstantPool;
    024import org.apache.bcel.util.ByteSequence;
    025
    026/**
    027 * MULTIANEWARRAY - Create new mutidimensional array of references
    028 *
    029 * <PRE>
    030 * Stack: ..., count1, [count2, ...] -&gt; ..., arrayref
    031 * </PRE>
    032 */
    033public class MULTIANEWARRAY extends CPInstruction implements LoadClass, AllocationInstruction, ExceptionThrower {
    034
    035    private short dimensions;
    036
    037    /**
    038     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    039     */
    040    MULTIANEWARRAY() {
    041    }
    042
    043    public MULTIANEWARRAY(final int index, final short dimensions) {
    044        super(org.apache.bcel.Const.MULTIANEWARRAY, index);
    045        if (dimensions < 1) {
    046            throw new ClassGenException("Invalid dimensions value: " + dimensions);
    047        }
    048        this.dimensions = dimensions;
    049        super.setLength(4);
    050    }
    051
    052    /**
    053     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    054     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
    055     *
    056     * @param v Visitor object
    057     */
    058    @Override
    059    public void accept(final Visitor v) {
    060        v.visitLoadClass(this);
    061        v.visitAllocationInstruction(this);
    062        v.visitExceptionThrower(this);
    063        v.visitTypedInstruction(this);
    064        v.visitCPInstruction(this);
    065        v.visitMULTIANEWARRAY(this);
    066    }
    067
    068    /**
    069     * Also works for instructions whose stack effect depends on the constant pool entry they reference.
    070     *
    071     * @return Number of words consumed from stack by this instruction
    072     */
    073    @Override
    074    public int consumeStack(final ConstantPoolGen cpg) {
    075        return dimensions;
    076    }
    077
    078    /**
    079     * Dump instruction as byte code to stream out.
    080     *
    081     * @param out Output stream
    082     */
    083    @Override
    084    public void dump(final DataOutputStream out) throws IOException {
    085        out.writeByte(super.getOpcode());
    086        out.writeShort(super.getIndex());
    087        out.writeByte(dimensions);
    088    }
    089
    090    /**
    091     * @return number of dimensions to be created
    092     */
    093    public final short getDimensions() {
    094        return dimensions;
    095    }
    096
    097    @Override
    098    public Class<?>[] getExceptions() {
    099        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_CLASS_AND_INTERFACE_RESOLUTION, ExceptionConst.ILLEGAL_ACCESS_ERROR,
    100            ExceptionConst.NEGATIVE_ARRAY_SIZE_EXCEPTION);
    101    }
    102
    103    @Override
    104    public ObjectType getLoadClassType(final ConstantPoolGen cpg) {
    105        Type t = getType(cpg);
    106        if (t instanceof ArrayType) {
    107            t = ((ArrayType) t).getBasicType();
    108        }
    109        return t instanceof ObjectType ? (ObjectType) t : null;
    110    }
    111
    112    /**
    113     * Read needed data (i.e., no. dimension) from file.
    114     */
    115    @Override
    116    protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
    117        super.initFromFile(bytes, wide);
    118        dimensions = bytes.readByte();
    119        super.setLength(4);
    120    }
    121
    122    /**
    123     * @return mnemonic for instruction
    124     */
    125    @Override
    126    public String toString(final boolean verbose) {
    127        return super.toString(verbose) + " " + super.getIndex() + " " + dimensions;
    128    }
    129
    130    /**
    131     * @return mnemonic for instruction with symbolic references resolved
    132     */
    133    @Override
    134    public String toString(final ConstantPool cp) {
    135        return super.toString(cp) + " " + dimensions;
    136    }
    137}