blob: dc855aaada256f5bba37d72ff69cb1d0b96c4ebb (
plain)
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
|
// RUN: %clang_cc1 -analyze -analyzer-checker=core,osx.cocoa.Loops,debug.ExprInspection -verify %s
void clang_analyzer_eval(int);
#define nil ((id)0)
typedef unsigned long NSUInteger;
@protocol NSFastEnumeration
- (int)countByEnumeratingWithState:(void *)state objects:(id *)objects count:(unsigned)count;
@end
@interface NSObject
+ (instancetype)testObject;
@end
@interface NSEnumerator <NSFastEnumeration>
@end
@interface NSArray : NSObject <NSFastEnumeration>
- (NSUInteger)count;
- (NSEnumerator *)objectEnumerator;
@end
@interface NSDictionary : NSObject <NSFastEnumeration>
- (NSUInteger)count;
@end
@interface NSMutableDictionary : NSDictionary
@end
@interface NSSet : NSObject <NSFastEnumeration>
- (NSUInteger)count;
@end
@interface NSPointerArray : NSObject <NSFastEnumeration>
@end
@interface NSString : NSObject
@end
void test() {
id x;
for (x in [NSArray testObject])
clang_analyzer_eval(x != nil); // expected-warning{{TRUE}}
for (x in [NSMutableDictionary testObject])
clang_analyzer_eval(x != nil); // expected-warning{{TRUE}}
for (x in [NSSet testObject])
clang_analyzer_eval(x != nil); // expected-warning{{TRUE}}
for (x in [[NSArray testObject] objectEnumerator])
clang_analyzer_eval(x != nil); // expected-warning{{TRUE}}
for (x in [NSPointerArray testObject])
clang_analyzer_eval(x != nil); // expected-warning{{UNKNOWN}}
}
void testWithVarInFor() {
for (id x in [NSArray testObject])
clang_analyzer_eval(x != nil); // expected-warning{{TRUE}}
for (id x in [NSPointerArray testObject])
clang_analyzer_eval(x != nil); // expected-warning{{UNKNOWN}}
}
void testNonNil(id a, id b) {
clang_analyzer_eval(a != nil); // expected-warning{{UNKNOWN}}
for (id x in a)
clang_analyzer_eval(a != nil); // expected-warning{{TRUE}}
if (b != nil)
return;
for (id x in b)
*(volatile int *)0 = 1; // no-warning
clang_analyzer_eval(b != nil); // expected-warning{{FALSE}}
}
void collectionIsEmpty(NSMutableDictionary *D){
if ([D count] == 0) { // Count is zero.
NSString *s = 0;
for (NSString *key in D) {
s = key; // Loop is never entered.
}
clang_analyzer_eval(s == 0); //expected-warning{{TRUE}}
}
}
void processCollection(NSMutableDictionary *D);
void collectionIsEmptyCollectionIsModified(NSMutableDictionary *D){
if ([D count] == 0) { // Count is zero.
NSString *s = 0;
processCollection(D); // However, the collection has changed.
for (NSString *key in D) {
s = key; // Loop might be entered.
}
clang_analyzer_eval(s == 0); //expected-warning{{FALSE}} //expected-warning{{TRUE}}
}
}
int collectionIsEmptyNSSet(NSSet *S){
if ([S count] == 2) { // Count is non zero.
int tapCounts[2];
int i = 0;
for (NSString *elem in S) {
tapCounts[i]= 1; // Loop is entered.
i++;
}
return (tapCounts[0]); //no warning
}
return 0;
}
int collectionIsNotEmptyNSArray(NSArray *A) {
int count = [A count];
if (count > 0) {
int i;
int j;
for (NSString *a in A) {
i = 1;
j++;
}
clang_analyzer_eval(i == 1); // expected-warning {{TRUE}}
}
return 0;
}
void onlySuppressExitAfterZeroIterations(NSMutableDictionary *D) {
if (D.count > 0) {
int *x;
int i;
for (NSString *key in D) {
x = 0;
i++;
}
// Test that this is reachable.
int y = *x; // expected-warning {{Dereference of null pointer}}
y++;
}
}
void onlySuppressLoopExitAfterZeroIterations_WithContinue(NSMutableDictionary *D) {
if (D.count > 0) {
int *x;
int i;
for (NSString *key in D) {
x = 0;
i++;
continue;
}
// Test that this is reachable.
int y = *x; // expected-warning {{Dereference of null pointer}}
y++;
}
}
int* getPtr();
void onlySuppressLoopExitAfterZeroIterations_WithBreak(NSMutableDictionary *D) {
if (D.count > 0) {
int *x;
int i;
for (NSString *key in D) {
x = 0;
break;
x = getPtr();
i++;
}
int y = *x; // expected-warning {{Dereference of null pointer}}
y++;
}
}
int consistencyBetweenLoopsWhenCountIsUnconstrained(NSMutableDictionary *D) {
// Note, The current limitation is that we need to have a count.
// TODO: This should work even when we do not call count.
int count = [D count];
int i;
int j = 0;
for (NSString *key in D) {
i = 5;
j++;
}
for (NSString *key in D) {
return i; // no-warning
}
return 0;
}
int consistencyBetweenLoopsWhenCountIsUnconstrained_dual(NSMutableDictionary *D) {
int count = [D count];
int i = 8;
int j = 1;
for (NSString *key in D) {
i = 0;
j++;
}
for (NSString *key in D) {
i = 5;
j++;
}
return 5/i;
}
|
