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Java > Open Source Codes > com > sun > org > apache > bcel > internal > generic > MULTIANEWARRAY


1 package com.sun.org.apache.bcel.internal.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 com.sun.org.apache.bcel.internal.util.ByteSequence;
58 import com.sun.org.apache.bcel.internal.classfile.ConstantPool;
59 import com.sun.org.apache.bcel.internal.ExceptionConstants;
60
61 /**
62  * MULTIANEWARRAY - Create new mutidimensional array of references
63  * <PRE>Stack: ..., count1, [count2, ...] -&gt; ..., 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(com.sun.org.apache.bcel.internal.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 JavaDoc 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 JavaDoc 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 JavaDoc[] getExceptions() {
135     Class JavaDoc[] cs = new Class JavaDoc[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 }
173
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