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
162
163
164
165
166
167
168
169
|
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.evaluation.value;
/**
* This abstract class represents a partially evaluated value.
*
* @author Eric Lafortune
*/
public abstract class Value
{
public static final int NEVER = -1;
public static final int MAYBE = 0;
public static final int ALWAYS = 1;
public static final int TYPE_INTEGER = 1;
public static final int TYPE_LONG = 2;
public static final int TYPE_FLOAT = 3;
public static final int TYPE_DOUBLE = 4;
public static final int TYPE_REFERENCE = 5;
public static final int TYPE_INSTRUCTION_OFFSET = 6;
public static final int TYPE_TOP = 7;
/**
* Returns this Value as a Category1Value.
*/
public Category1Value category1Value()
{
throw new IllegalArgumentException("Value is not a Category 1 value [" + this.getClass().getName() + "]");
}
/**
* Returns this Value as a Category2Value.
*/
public Category2Value category2Value()
{
throw new IllegalArgumentException("Value is not a Category 2 value [" + this.getClass().getName() + "]");
}
/**
* Returns this Value as an IntegerValue.
*/
public IntegerValue integerValue()
{
throw new IllegalArgumentException("Value is not an integer value [" + this.getClass().getName() + "]");
}
/**
* Returns this Value as a LongValue.
*/
public LongValue longValue()
{
throw new IllegalArgumentException("Value is not a long value [" + this.getClass().getName() + "]");
}
/**
* Returns this Value as a FloatValue.
*/
public FloatValue floatValue()
{
throw new IllegalArgumentException("Value is not a float value [" + this.getClass().getName() + "]");
}
/**
* Returns this Value as a DoubleValue.
*/
public DoubleValue doubleValue()
{
throw new IllegalArgumentException("Value is not a double value [" + this.getClass().getName() + "]");
}
/**
* Returns this Value as a ReferenceValue.
*/
public ReferenceValue referenceValue()
{
throw new IllegalArgumentException("Value is not a reference value [" + this.getClass().getName() + "]");
}
/**
* Returns this Value as an InstructionOffsetValue.
*/
public InstructionOffsetValue instructionOffsetValue()
{
throw new IllegalArgumentException("Value is not an instruction offset value [" + this.getClass().getName() + "]");
}
/**
* Returns whether this Value represents a single specific (but possibly
* unknown) value.
*/
public boolean isSpecific()
{
return false;
}
/**
* Returns whether this Value represents a single particular (known)
* value.
*/
public boolean isParticular()
{
return false;
}
/**
* Returns the generalization of this Value and the given other Value.
*/
public abstract Value generalize(Value other);
/**
* Returns whether the computational type of this Value is a category 2 type.
* This means that it takes up the space of two category 1 types on the
* stack, for instance.
*/
public abstract boolean isCategory2();
/**
* Returns the computational type of this Value.
* @return <code>TYPE_INTEGER</code>,
* <code>TYPE_LONG</code>,
* <code>TYPE_FLOAT</code>,
* <code>TYPE_DOUBLE</code>,
* <code>TYPE_REFERENCE</code>, or
* <code>TYPE_INSTRUCTION_OFFSET</code>.
*/
public abstract int computationalType();
/**
* Returns the internal type of this Value.
* @return <code>ClassConstants.INTERNAL_TYPE_BOOLEAN</code>,
* <code>ClassConstants.INTERNAL_TYPE_BYTE</code>,
* <code>ClassConstants.INTERNAL_TYPE_CHAR</code>,
* <code>ClassConstants.INTERNAL_TYPE_SHORT</code>,
* <code>ClassConstants.INTERNAL_TYPE_INT</code>,
* <code>ClassConstants.INTERNAL_TYPE_LONG</code>,
* <code>ClassConstants.INTERNAL_TYPE_FLOAT</code>,
* <code>ClassConstants.INTERNAL_TYPE_DOUBLE</code>,
* <code>ClassConstants.INTERNAL_TYPE_CLASS_START ... ClassConstants.INTERNAL_TYPE_CLASS_END</code>, or
* an array type containing any of these types (always as String).
*/
public abstract String internalType();
}
|
