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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