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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