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    1   package org.apache.bcel.generic;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
    15   *
    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
    29   *    "Apache BCEL" must not be used to endorse or promote products
    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    "Apache BCEL", nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    48   * SUCH DAMAGE.
    49   * ====================================================================
    50   *
    51   * This software consists of voluntary contributions made by many
    52   * individuals on behalf of the Apache Software Foundation.  For more
    53   * information on the Apache Software Foundation, please see
    54   * <http://www.apache.org/>;.
    55   */
    56  import java.io.*;
    57  import org.apache.bcel.util.ByteSequence;
    58  import org.apache.bcel.classfile.ConstantPool;
    59  import org.apache.bcel.ExceptionConstants;
    60
    61  /***
    62   * MULTIANEWARRAY - Create new mutidimensional array of references
    63   * <PRE>Stack: ..., count1, [count2, ...] -> ..., arrayref</PRE>
    64   *
    65   * @version $Id: MULTIANEWARRAY.java,v 1.1.1.1 2001/10/29 20:00:24 jvanzyl Exp $
    66   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
    67   */
    68  public class MULTIANEWARRAY extends CPInstruction implements LoadClass, AllocationInstruction, ExceptionThrower {
    69    private short dimensions;
    70
    71    /***
    72     * Empty constructor needed for the Class.newInstance() statement in
    73     * Instruction.readInstruction(). Not to be used otherwise.
    74     */
    75    MULTIANEWARRAY() {}
    76
    77    public MULTIANEWARRAY(int index, short dimensions) {
    78      super(org.apache.bcel.Constants.MULTIANEWARRAY, index);
    79
    80      if(dimensions < 1)
    81        throw new ClassGenException("Invalid dimensions value: " + dimensions);
    82
    83      this.dimensions = dimensions;
    84      length = 4;
    85    }
    86
    87    /***
    88     * Dump instruction as byte code to stream out.
    89     * @param out Output stream
    90     */
    91    public void dump(DataOutputStream out) throws IOException {
    92      out.writeByte(opcode);
    93      out.writeShort(index);
    94      out.writeByte(dimensions);
    95    }
    96
    97    /***
    98     * Read needed data (i.e., no. dimension) from file.
    99     */
    100   protected void initFromFile(ByteSequence bytes, boolean wide)
    101        throws IOException
    102   {
    103     super.initFromFile(bytes, wide);
    104     dimensions = bytes.readByte();
    105     length     = 4;
    106   }
    107
    108   /***
    109    * @return number of dimensions to be created
    110    */
    111   public final short getDimensions() { return dimensions; }
    112
    113   /***
    114    * @return mnemonic for instruction
    115    */
    116   public String toString(boolean verbose) {
    117     return super.toString(verbose) + " " + index + " " + dimensions;
    118   }
    119
    120   /***
    121    * @return mnemonic for instruction with symbolic references resolved
    122    */
    123   public String toString(ConstantPool cp) {
    124     return super.toString(cp) + " " + dimensions;
    125   }
    126
    127   /***
    128    * Also works for instructions whose stack effect depends on the
    129    * constant pool entry they reference.
    130    * @return Number of words consumed from stack by this instruction
    131    */
    132   public int consumeStack(ConstantPoolGen cpg) { return dimensions; }
    133
    134   public Class[] getExceptions() {
    135     Class[] cs = new Class[2 + ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length];
    136
    137     System.arraycopy(ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION, 0,
    138 		     cs, 0, ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length);
    139
    140     cs[ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length+1] = ExceptionConstants.NEGATIVE_ARRAY_SIZE_EXCEPTION;
    141     cs[ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length]   = ExceptionConstants.ILLEGAL_ACCESS_ERROR;
    142
    143     return cs;
    144   }
    145
    146   public ObjectType getLoadClassType(ConstantPoolGen cpg) {
    147     Type t = getType(cpg);
    148
    149     if (t instanceof ArrayType){
    150       t = ((ArrayType) t).getBasicType();
    151     }
    152
    153     return (t instanceof ObjectType)? (ObjectType) t : null;
    154   }
    155
    156   /***
    157    * Call corresponding visitor method(s). The order is:
    158    * Call visitor methods of implemented interfaces first, then
    159    * call methods according to the class hierarchy in descending order,
    160    * i.e., the most specific visitXXX() call comes last.
    161    *
    162    * @param v Visitor object
    163    */
    164   public void accept(Visitor v) {
    165     v.visitLoadClass(this);
    166     v.visitAllocationInstruction(this);
    167     v.visitExceptionThrower(this);
    168     v.visitTypedInstruction(this);
    169     v.visitCPInstruction(this);
    170     v.visitMULTIANEWARRAY(this);
    171   }
    172 }

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