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
| // RUN: %clang_analyze_cc1 -analyzer-checker=core,unix.Malloc,debug.ExprInspection -analyzer-max-loop 4 -analyzer-config widen-loops=true -verify -analyzer-config eagerly-assume=false %s
// RUN: %clang_analyze_cc1 -DTEST_NULL_TERM -analyzer-checker=core,unix.Malloc,debug.ExprInspection,alpha.cplusplus.IteratorRange -analyzer-max-loop 4 -analyzer-config widen-loops=true -verify -analyzer-config eagerly-assume=false %s
void clang_analyzer_eval(int);
void clang_analyzer_warnIfReached();
typedef __typeof(sizeof(int)) size_t;
void *malloc(size_t);
void free(void *);
void loop_which_iterates_limit_times_not_widened() {
int i;
int x = 1;
// Check loop isn't widened by checking x isn't invalidated
for (i = 0; i < 1; ++i) {}
clang_analyzer_eval(x == 1); // expected-warning {{TRUE}}
for (i = 0; i < 2; ++i) {}
clang_analyzer_eval(x == 1); // expected-warning {{TRUE}}
for (i = 0; i < 3; ++i) {}
// FIXME loss of precision as a result of evaluating the widened loop body
// *instead* of the last iteration.
clang_analyzer_eval(x == 1); // expected-warning {{UNKNOWN}}
}
int a_global;
void loop_evaluated_before_widening() {
int i;
a_global = 1;
for (i = 0; i < 10; ++i) {
if (i == 2) {
// True before widening then unknown after.
clang_analyzer_eval(a_global == 1); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}}
}
}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void warnings_after_loop() {
int i;
for (i = 0; i < 10; ++i) {}
char *m = (char*)malloc(12);
} // expected-warning {{Potential leak of memory pointed to by 'm'}}
void for_loop_exits() {
int i;
for (i = 0; i < 10; ++i) {}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void while_loop_exits() {
int i = 0;
while (i < 10) {++i;}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void do_while_loop_exits() {
int i = 0;
do {++i;} while (i < 10);
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void loop_body_is_widened() {
int i = 0;
while (i < 100) {
if (i > 10) {
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
++i;
}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void invariably_infinite_loop() {
int i = 0;
while (1) { ++i; }
clang_analyzer_warnIfReached(); // no-warning
}
void invariably_infinite_break_loop() {
int i = 0;
while (1) {
++i;
int x = 1;
if (!x) break;
}
clang_analyzer_warnIfReached(); // no-warning
}
void reachable_break_loop() {
int i = 0;
while (1) {
++i;
if (i == 100) break;
}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void condition_constrained_true_in_loop() {
int i = 0;
while (i < 50) {
clang_analyzer_eval(i < 50); // expected-warning {{TRUE}}
++i;
}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void condition_constrained_false_after_loop() {
int i = 0;
while (i < 50) {
++i;
}
clang_analyzer_eval(i >= 50); // expected-warning {{TRUE}}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void multiple_exit_test() {
int x = 0;
int i = 0;
while (i < 50) {
if (x) {
i = 10;
break;
}
++i;
}
// Reachable by 'normal' exit
if (i == 50) clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
// Reachable by break point
if (i == 10) clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
// Not reachable
if (i < 10) clang_analyzer_warnIfReached(); // no-warning
if (i > 10 && i < 50) clang_analyzer_warnIfReached(); // no-warning
}
void pointer_doesnt_leak_from_loop() {
int *h_ptr = (int *) malloc(sizeof(int));
for (int i = 0; i < 2; ++i) {}
for (int i = 0; i < 10; ++i) {} // no-warning
free(h_ptr);
}
int g_global;
void unknown_after_loop(int s_arg) {
g_global = 0;
s_arg = 1;
int s_local = 2;
int *h_ptr = malloc(sizeof(int));
for (int i = 0; i < 10; ++i) {}
clang_analyzer_eval(g_global); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(s_arg); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(s_local); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(h_ptr == 0); // expected-warning {{UNKNOWN}}
free(h_ptr);
}
void variable_bound_exiting_loops_widened(int x) {
int i = 0;
int t = 1;
while (i < x) {
++i;
}
clang_analyzer_eval(t == 1); // expected-warning {{TRUE}} // expected-warning {{UNKNOWN}}
}
void nested_loop_outer_widen() {
int i = 0, j = 0;
for (i = 0; i < 10; i++) {
clang_analyzer_eval(i < 10); // expected-warning {{TRUE}}
for (j = 0; j < 2; j++) {
clang_analyzer_eval(j < 2); // expected-warning {{TRUE}}
}
clang_analyzer_eval(j >= 2); // expected-warning {{TRUE}}
}
clang_analyzer_eval(i >= 10); // expected-warning {{TRUE}}
}
void nested_loop_inner_widen() {
int i = 0, j = 0;
for (i = 0; i < 2; i++) {
clang_analyzer_eval(i < 2); // expected-warning {{TRUE}}
for (j = 0; j < 10; j++) {
clang_analyzer_eval(j < 10); // expected-warning {{TRUE}}
}
clang_analyzer_eval(j >= 10); // expected-warning {{TRUE}}
}
clang_analyzer_eval(i >= 2); // expected-warning {{TRUE}}
}
#ifdef TEST_NULL_TERM
void null_terminator_loop_widen(int *a) {
int c;
// Loop widening will call 'invalidateRegions()' and 'invalidateRegions()'
// will construct the SymbolConjured with null Stmt because of the null
// terminator statement. Accessing the null Stmt will cause a crash.
for (;;) {
c = *a; // no-crash
a++;
}
}
#endif
|