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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