1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.bcel.classfile;
import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.bcel.Const;
/**
* This class represents a stack map attribute used for
* preverification of Java classes for the <a
* href="http://java.sun.com/j2me/"> Java 2 Micro Edition</a>
* (J2ME). This attribute is used by the <a
* href="http://java.sun.com/products/cldc/">KVM</a> and contained
* within the Code attribute of a method. See CLDC specification
* �5.3.1.2
*
* @version $Id$
* @see Code
* @see StackMapEntry
* @see StackMapType
*/
public final class StackMap extends Attribute {
private StackMapEntry[] map; // Table of stack map entries
/*
* @param name_index Index of name
* @param length Content length in bytes
* @param map Table of stack map entries
* @param constant_pool Array of constants
*/
public StackMap(final int name_index, final int length, final StackMapEntry[] map, final ConstantPool constant_pool) {
super(Const.ATTR_STACK_MAP, name_index, length, constant_pool);
this.map = map;
}
/**
* Construct object from input stream.
*
* @param name_index Index of name
* @param length Content length in bytes
* @param input Input stream
* @param constant_pool Array of constants
* @throws IOException
*/
StackMap(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool) throws IOException {
this(name_index, length, (StackMapEntry[]) null, constant_pool);
final int map_length = input.readUnsignedShort();
map = new StackMapEntry[map_length];
for (int i = 0; i < map_length; i++) {
map[i] = new StackMapEntry(input, constant_pool);
}
}
/**
* Dump line number table attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
@Override
public final void dump( final DataOutputStream file ) throws IOException {
super.dump(file);
file.writeShort(map.length);
for (final StackMapEntry entry : map) {
entry.dump(file);
}
}
/**
* @return Array of stack map entries
*/
public final StackMapEntry[] getStackMap() {
return map;
}
/**
* @param map Array of stack map entries
*/
public final void setStackMap( final StackMapEntry[] map ) {
this.map = map;
int len = 2; // Length of 'number_of_entries' field prior to the array of stack maps
for (final StackMapEntry element : map) {
len += element.getMapEntrySize();
}
setLength(len);
}
/**
* @return String representation.
*/
@Override
public final String toString() {
final StringBuilder buf = new StringBuilder("StackMap(");
for (int i = 0; i < map.length; i++) {
buf.append(map[i]);
if (i < map.length - 1) {
buf.append(", ");
}
}
buf.append(')');
return buf.toString();
}
/**
* @return deep copy of this attribute
*/
@Override
public Attribute copy( final ConstantPool _constant_pool ) {
final StackMap c = (StackMap) clone();
c.map = new StackMapEntry[map.length];
for (int i = 0; i < map.length; i++) {
c.map[i] = map[i].copy();
}
c.setConstantPool(_constant_pool);
return c;
}
/**
* Called by objects that are traversing the nodes of the tree implicitely
* defined by the contents of a Java class. I.e., the hierarchy of methods,
* fields, attributes, etc. spawns a tree of objects.
*
* @param v Visitor object
*/
@Override
public void accept( final Visitor v ) {
v.visitStackMap(this);
}
public final int getMapLength() {
return map == null ? 0 : map.length;
}
}
|
