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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
import org.checkerframework.dataflow.qual.Deterministic;
import org.checkerframework.dataflow.qual.Pure;
import org.checkerframework.dataflow.qual.SideEffectFree;
import org.checkerframework.framework.test.*;
import testlib.util.*;
// various tests for the @Pure annotation
class Purity {
String f1, f2, f3;
String[] a;
// class with a (potentially) non-pure constructor
private static class NonPureClass {}
// class with a pure constructor
private static class PureClass {
@Pure
// :: warning: (purity.deterministic.constructor)
// :: error: (purity.not.deterministic.not.sideeffectfree.call.method)
public PureClass() {}
}
// class with a side-effect-free constructor
private static class SEClass {
@SideEffectFree
// :: error: (purity.not.sideeffectfree.call.method)
public SEClass() {}
}
// a method that is not pure (no annotation)
void nonpure() {}
@Pure
String pure() {
return "";
}
@Pure
// :: warning: (purity.deterministic.void.method)
void t1() {}
@SideEffectFree
void t1b() {}
@Deterministic
// :: warning: (purity.deterministic.void.method)
void t1c() {}
@Pure
String t2() {
return "";
}
@Pure
String t3() {
// :: error: (purity.not.deterministic.not.sideeffectfree.call.method)
nonpure();
// :: error: (purity.not.deterministic.call.method)
t16b(); // Calling a @SideEffectFree method
// :: error: (purity.not.sideeffectfree.call.method)
t16c(); // Calling a @Deterministic method
return "";
}
@Pure
String t4() {
pure();
return "";
}
@Pure
int t5() {
int i = 1;
return i;
}
@Pure
int t6() {
int j = 0;
for (int i = 0; i < 10; i++) {
j = j - i;
}
return j;
}
@Pure
String t7() {
if (true) {
return "a";
}
return "";
}
@Pure
int t8() {
return 1 - 2 / 3 * 2 % 2;
}
@Pure
String t9() {
return "b" + "a";
}
@Pure
String t10() {
// :: error: (purity.not.deterministic.not.sideeffectfree.assign.field)
f1 = "";
// :: error: (purity.not.deterministic.not.sideeffectfree.assign.field)
f2 = "";
return "";
}
@Pure
String t11(Purity l) {
// :: error: (purity.not.deterministic.not.sideeffectfree.assign.array)
l.a[0] = "";
return "";
}
@Pure
String t12(String[] s) {
// :: error: (purity.not.deterministic.not.sideeffectfree.assign.array)
s[0] = "";
return "";
}
@Pure
String t13() {
// :: error: (purity.not.deterministic.object.creation)
PureClass p = new PureClass();
return "";
}
@SideEffectFree
String t13b() {
PureClass p = new PureClass();
return "";
}
@SideEffectFree
String t13d() {
SEClass p = new SEClass();
return "";
}
@Deterministic
String t13c() {
// :: error: (purity.not.deterministic.object.creation)
PureClass p = new PureClass();
return "";
}
@Pure
String t14() {
String i = "";
i = "a";
return i;
}
@Pure
String t15() {
String[] s = new String[1];
return s[0];
}
@Pure
String t16() {
try {
int i = 1 / 0;
// :: error: (purity.not.deterministic.catch)
} catch (Throwable t) {
// ...
}
return "";
}
@SideEffectFree
String t16b() {
try {
int i = 1 / 0;
} catch (Throwable t) {
// ...
}
return "";
}
@Deterministic
String t16c() {
try {
int i = 1 / 0;
// :: error: (purity.not.deterministic.catch)
} catch (Throwable t) {
// ...
}
return "";
}
@Pure
String t12() {
// :: error: (purity.not.sideeffectfree.call.constructor)
// :: error: (purity.not.deterministic.object.creation)
NonPureClass p = new NonPureClass();
return "";
}
@Deterministic
String t17a(Purity l) {
// :: error: (purity.not.deterministic.assign.field)
f1 = "";
// :: error: (purity.not.deterministic.assign.array)
l.a[0] = "";
// :: error: (purity.not.deterministic.call.method)
nonpure();
// :: error: (purity.not.deterministic.call.method)
return t16b(); // Calling a @SideEffectFree method
}
@SideEffectFree
String t17b() {
// :: error: (purity.not.sideeffectfree.assign.field)
f1 = "";
// :: error: (purity.not.sideeffectfree.call.constructor)
NonPureClass p = new NonPureClass();
// :: error: (purity.not.sideeffectfree.call.method)
nonpure();
// :: error: (purity.not.sideeffectfree.call.method)
return t16c(); // Calling a @Deterministic method
}
// @Pure annotations on the overridden implementation.
class Super {
@Pure
int m1(int arg) {
return 0;
}
@Pure
int m2(int arg) {
return 0;
}
int m3(int arg) {
return 0;
}
int m4(int arg) {
return 0;
}
}
class Sub extends Super {
@Pure
int m1(int arg) {
return 0;
}
int m2(int arg) {
return 0;
}
@Pure
int m3(int arg) {
return 0;
}
int m4(int arg) {
return 0;
}
}
class MyClass extends Object {
public int hashCode() {
return 42;
}
}
}
|
