1 // RUN: %clang_cc1 -std=c99 -Dbool=_Bool -analyze -analyzer-checker=core,alpha.core.TestAfterDivZero -analyzer-output=text -verify %s
2 // RUN: %clang_cc1 -x c++ -analyze -analyzer-checker=core,alpha.core.TestAfterDivZero -analyzer-output=text -verify %s
3
4 int var;
5
err_eq(int x)6 void err_eq(int x) {
7 var = 77 / x; // expected-note {{Division with compared value made here}}
8 if (x == 0) { } // expected-warning {{Value being compared against zero has already been used for division}}
9 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
10
err_eq2(int x)11 void err_eq2(int x) {
12 var = 77 / x; // expected-note {{Division with compared value made here}}
13 if (0 == x) { } // expected-warning {{Value being compared against zero has already been used for division}}
14 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
15
err_ne(int x)16 void err_ne(int x) {
17 var = 77 / x; // expected-note {{Division with compared value made here}}
18 if (x != 0) { } // expected-warning {{Value being compared against zero has already been used for division}}
19 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
20
err_ge(int x)21 void err_ge(int x) {
22 var = 77 / x; // expected-note {{Division with compared value made here}}
23 if (x >= 0) { } // expected-warning {{Value being compared against zero has already been used for division}}
24 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
25
err_le(int x)26 void err_le(int x) {
27 var = 77 / x; // expected-note {{Division with compared value made here}}
28 if (x <= 0) {} // expected-warning {{Value being compared against zero has already been used for division}}
29 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
30
err_yes(int x)31 void err_yes(int x) {
32 var = 77 / x; // expected-note {{Division with compared value made here}}
33 if (x) {} // expected-warning {{Value being compared against zero has already been used for division}}
34 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
err_not(int x)35 void err_not(int x) {
36 var = 77 / x; // expected-note {{Division with compared value made here}}
37 if (!x) {} // expected-warning {{Value being compared against zero has already been used for division}}
38 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
39
err_pnot(int x)40 void err_pnot(int x) {
41 int *y = &x;
42 var = 77 / *y; // expected-note {{Division with compared value made here}}
43 if (!x) {} // expected-warning {{Value being compared against zero has already been used for division}}
44 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
45
err_pnot2(int x)46 void err_pnot2(int x) {
47 int *y = &x;
48 var = 77 / x; // expected-note {{Division with compared value made here}}
49 if (!*y) {} // expected-warning {{Value being compared against zero has already been used for division}}
50 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
51
err_ppnot(int x)52 void err_ppnot(int x) {
53 int *y = &x;
54 int **z = &y;
55 var = 77 / **z; // expected-note {{Division with compared value made here}}
56 if (!x) {} // expected-warning {{Value being compared against zero has already been used for division}}
57 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
58
err_orig_checker(int x)59 void err_orig_checker(int x) {
60 if (x != 0) // expected-note {{Assuming 'x' is equal to 0}} expected-note {{Taking false branch}}
61 return;
62 var = 77 / x; // expected-warning {{Division by zero}} expected-note {{Division by zero}}
63 if (!x) {} // no-warning
64 }
65
ok_other(int x,int y)66 void ok_other(int x, int y) {
67 var = 77 / y;
68 if (x == 0) {
69 }
70 }
71
ok_assign(int x)72 void ok_assign(int x) {
73 var = 77 / x;
74 x = var / 77; // <- assignment => don't warn
75 if (x == 0) {
76 }
77 }
78
ok_assign2(int x)79 void ok_assign2(int x) {
80 var = 77 / x;
81 x = var / 77; // <- assignment => don't warn
82 if (0 == x) {
83 }
84 }
85
ok_dec(int x)86 void ok_dec(int x) {
87 var = 77 / x;
88 x--; // <- assignment => don't warn
89 if (x == 0) {
90 }
91 }
92
ok_inc(int x)93 void ok_inc(int x) {
94 var = 77 / x;
95 x++; // <- assignment => don't warn
96 if (x == 0) {
97 }
98 }
99
100 void do_something_ptr(int *x);
ok_callfunc_ptr(int x)101 void ok_callfunc_ptr(int x) {
102 var = 77 / x;
103 do_something_ptr(&x); // <- pass address of x to function => don't warn
104 if (x == 0) {
105 }
106 }
107
108 void do_something(int x);
nok_callfunc(int x)109 void nok_callfunc(int x) {
110 var = 77 / x; // expected-note {{Division with compared value made here}}
111 do_something(x);
112 if (x == 0) {} // expected-warning {{Value being compared against zero has already been used for division}}
113 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
114
ok_if(int x)115 void ok_if(int x) {
116 if (x > 3)
117 var = 77 / x;
118 if (x == 0) {
119 }
120 }
121
ok_if2(int x)122 void ok_if2(int x) {
123 if (x < 3)
124 var = 77 / x;
125 if (x == 0) {
126 } // TODO warn here
127 }
128
ok_pif(int x)129 void ok_pif(int x) {
130 int *y = &x;
131 if (x < 3)
132 var = 77 / *y;
133 if (x == 0) {
134 } // TODO warn here
135 }
136
137 int getValue(bool *isPositive);
138 void use(int a);
foo()139 void foo() {
140 bool isPositive;
141 int x = getValue(&isPositive);
142 if (isPositive) {
143 use(5 / x);
144 }
145
146 if (x == 0) {
147 }
148 }
149
150 int getValue2();
foo2()151 void foo2() {
152 int x = getValue2();
153 int y = x;
154
155 use(5 / x); // expected-note {{Division with compared value made here}}
156 if (y == 0) {} // expected-warning {{Value being compared against zero has already been used for division}}
157 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
158
ok_while(int x)159 void ok_while(int x) {
160 int n = 100 / x;
161 while (x != 0) { // <- do not warn
162 x--;
163 }
164 }
165
err_not2(int x,int y)166 void err_not2(int x, int y) {
167 int v;
168 var = 77 / x;
169
170 if (y)
171 v = 0;
172
173 if (!x) {
174 } // TODO warn here
175 }
176
inline_func(int x)177 inline void inline_func(int x) {
178 var = 77 / x; // expected-note {{Division with compared value made here}}
179 if (x == 0) {} // expected-warning {{Value being compared against zero has already been used for division}}
180 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
181
err_inline(int x)182 void err_inline(int x) {
183 var = 77 / x;
184 inline_func(x); // expected-note {{Calling 'inline_func'}}
185 if (x == 0) {
186 }
187 }
188
inline_func2(int x)189 inline void inline_func2(int x) {}
190
err_inline2(int x)191 void err_inline2(int x) {
192 var = 77 / x; // expected-note {{Division with compared value made here}}
193 inline_func2(x);
194 if (x == 0) {} // expected-warning {{Value being compared against zero has already been used for division}}
195 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
196
inline_func3(int x)197 inline void inline_func3(int x) {
198 var = 77 / x;
199 }
ok_inline(int x)200 void ok_inline(int x) {
201 var = 77 / x; // expected-note {{Division with compared value made here}}
202 inline_func3(x);
203 if (x == 0) {} // expected-warning {{Value being compared against zero has already been used for division}}
204 } // expected-note@-1 {{Value being compared against zero has already been used for division}}
205