1 | // RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only |
2 | |
3 | // PR 8876 - don't warn about trivially unreachable null derefs. Note that |
4 | // we put this here because the reachability analysis only kicks in for |
5 | // suppressing false positives when code has no errors. |
6 | #define PR8876(err_ptr) do {\ |
7 | if (err_ptr) *(int*)(err_ptr) = 1;\ |
8 | } while (0) |
9 | |
10 | #define PR8876_pos(err_ptr) do {\ |
11 | if (!err_ptr) *(int*)(err_ptr) = 1;\ |
12 | } while (0) |
13 | |
14 | |
15 | // Test that we don't report divide-by-zero errors in unreachable code. |
16 | // This test should be left as is, as it also tests CFG functionality. |
17 | void radar9171946() { |
18 | if (0) { |
19 | 0 / (0 ? 1 : 0); // expected-warning {{expression result unused}} |
20 | } |
21 | } |
22 | |
23 | int test_pr8876() { |
24 | PR8876(0); // no-warning |
25 | PR8876_pos(0); // expected-warning{{indirection of non-volatile null pointer will be deleted, not trap}} expected-note{{consider using __builtin_trap() or qualifying pointer with 'volatile'}} |
26 | return 0; |
27 | } |
28 | |
29 | // PR 8183 - Handle null pointer constants on the left-side of the '&&', and reason about |
30 | // this when determining the reachability of the null pointer dereference on the right side. |
31 | void pr8183(unsigned long long test) |
32 | { |
33 | (void)((((void*)0)) && (*((unsigned long long*)(((void*)0))) = ((unsigned long long)((test)) % (unsigned long long)((1000000000))))); // no-warning |
34 | (*((unsigned long long*)(((void*)0))) = ((unsigned long long)((test)) % (unsigned long long)((1000000000)))); // expected-warning {{indirection of non-volatile null pointer will be deleted, not trap}} expected-note {{consider using __builtin_trap() or qualifying pointer with 'volatile'}} |
35 | } |
36 | |
37 | // PR1966 |
38 | _Complex double test1() { |
39 | return __extension__ 1.0if; |
40 | } |
41 | |
42 | _Complex double test2() { |
43 | return 1.0if; // expected-warning {{imaginary constants are a GNU extension}} |
44 | } |
45 | |
46 | // rdar://6097308 |
47 | void test3() { |
48 | int x; |
49 | (__extension__ x) = 10; |
50 | } |
51 | |
52 | // rdar://6162726 |
53 | void test4() { |
54 | static int var; |
55 | var =+ 5; // expected-warning {{use of unary operator that may be intended as compound assignment (+=)}} |
56 | var =- 5; // expected-warning {{use of unary operator that may be intended as compound assignment (-=)}} |
57 | var = +5; // no warning when space between the = and +. |
58 | var = -5; |
59 | |
60 | var =+5; // no warning when the subexpr of the unary op has no space before it. |
61 | var =-5; |
62 | |
63 | #define FIVE 5 |
64 | var=-FIVE; // no warning with macros. |
65 | var=-FIVE; |
66 | } |
67 | |
68 | // rdar://6319320 |
69 | void test5(int *X, float *P) { |
70 | (float*)X = P; // expected-error {{assignment to cast is illegal, lvalue casts are not supported}} |
71 | #define FOO ((float*) X) |
72 | FOO = P; // expected-error {{assignment to cast is illegal, lvalue casts are not supported}} |
73 | } |
74 | |
75 | void test6() { |
76 | int X; |
77 | X(); // expected-error {{called object type 'int' is not a function or function pointer}} |
78 | } |
79 | |
80 | void test7(int *P, _Complex float Gamma) { |
81 | P = (P-42) + Gamma*4; // expected-error {{invalid operands to binary expression ('int *' and '_Complex float')}} |
82 | } |
83 | |
84 | |
85 | // rdar://6095061 |
86 | int test8(void) { |
87 | int i; |
88 | __builtin_choose_expr (0, 42, i) = 10; |
89 | return i; |
90 | } |
91 | |
92 | |
93 | // PR3386 |
94 | struct f { int x : 4; float y[]; }; |
95 | int test9(struct f *P) { |
96 | int R; |
97 | R = __alignof(P->x); // expected-error {{invalid application of 'alignof' to bit-field}} |
98 | R = __alignof(P->y); // ok. |
99 | R = sizeof(P->x); // expected-error {{invalid application of 'sizeof' to bit-field}} |
100 | __extension__ ({ R = (__typeof__(P->x)) 2; }); // expected-error {{invalid application of 'typeof' to bit-field}} |
101 | return R; |
102 | } |
103 | |
104 | // PR3562 |
105 | void test10(int n,...) { |
106 | struct S { |
107 | double a[n]; // expected-error {{fields must have a constant size}} |
108 | } s; |
109 | double x = s.a[0]; // should not get another error here. |
110 | } |
111 | |
112 | |
113 | #define MYMAX(A,B) __extension__ ({ __typeof__(A) __a = (A); __typeof__(B) __b = (B); __a < __b ? __b : __a; }) |
114 | |
115 | struct mystruct {int A; }; |
116 | void test11(struct mystruct P, float F) { |
117 | MYMAX(P, F); // expected-error {{invalid operands to binary expression ('typeof (P)' (aka 'struct mystruct') and 'typeof (F)' (aka 'float'))}} |
118 | } |
119 | |
120 | // PR3753 |
121 | int test12(const char *X) { |
122 | return X == "foo"; // expected-warning {{comparison against a string literal is unspecified (use strncmp instead)}} |
123 | } |
124 | |
125 | int test12b(const char *X) { |
126 | return sizeof(X == "foo"); // no-warning |
127 | } |
128 | |
129 | // rdar://6719156 |
130 | void test13( |
131 | void (^P)()) { // expected-error {{blocks support disabled - compile with -fblocks}} |
132 | P(); |
133 | P = ^(){}; // expected-error {{blocks support disabled - compile with -fblocks}} |
134 | } |
135 | |
136 | void test14() { |
137 | typedef long long __m64 __attribute__((__vector_size__(8))); |
138 | typedef short __v4hi __attribute__((__vector_size__(8))); |
139 | |
140 | // Ok. |
141 | __v4hi a; |
142 | __m64 mask = (__m64)((__v4hi)a > (__v4hi)a); |
143 | } |
144 | |
145 | |
146 | // PR5242 |
147 | typedef unsigned long *test15_t; |
148 | |
149 | test15_t test15(void) { |
150 | return (test15_t)0 + (test15_t)0; // expected-error {{invalid operands to binary expression ('test15_t' (aka 'unsigned long *') and 'test15_t')}} |
151 | } |
152 | |
153 | // rdar://7446395 |
154 | void test16(float x) { x == ((void*) 0); } // expected-error {{invalid operands to binary expression}} |
155 | |
156 | // PR6004 |
157 | void test17(int x) { |
158 | x = x / 0; // expected-warning {{division by zero is undefined}} |
159 | x = x % 0; // expected-warning {{remainder by zero is undefined}} |
160 | x /= 0; // expected-warning {{division by zero is undefined}} |
161 | x %= 0; // expected-warning {{remainder by zero is undefined}} |
162 | |
163 | x = sizeof(x/0); // no warning. |
164 | } |
165 | |
166 | // PR6501 & PR11857 |
167 | void test18_a(int a); // expected-note 2 {{'test18_a' declared here}} |
168 | void test18_b(int); // expected-note {{'test18_b' declared here}} |
169 | void test18_c(int a, int b); // expected-note 2 {{'test18_c' declared here}} |
170 | void test18_d(int a, ...); // expected-note {{'test18_d' declared here}} |
171 | void test18_e(int a, int b, ...); // expected-note {{'test18_e' declared here}} |
172 | void test18(int b) { |
173 | test18_a(b, b); // expected-error {{too many arguments to function call, expected single argument 'a', have 2}} |
174 | test18_a(); // expected-error {{too few arguments to function call, single argument 'a' was not specified}} |
175 | test18_b(); // expected-error {{too few arguments to function call, expected 1, have 0}} |
176 | test18_c(b); // expected-error {{too few arguments to function call, expected 2, have 1}} |
177 | test18_c(b, b, b); // expected-error {{too many arguments to function call, expected 2, have 3}} |
178 | test18_d(); // expected-error {{too few arguments to function call, at least argument 'a' must be specified}} |
179 | test18_e(); // expected-error {{too few arguments to function call, expected at least 2, have 0}} |
180 | } |
181 | |
182 | // PR7569 |
183 | void test19() { |
184 | *(int*)0 = 0; // expected-warning {{indirection of non-volatile null pointer}} \ |
185 | // expected-note {{consider using __builtin_trap}} |
186 | *(volatile int*)0 = 0; // Ok. |
187 | |
188 | // rdar://9269271 |
189 | int x = *(int*)0; // expected-warning {{indirection of non-volatile null pointer}} \ |
190 | // expected-note {{consider using __builtin_trap}} |
191 | int x2 = *(volatile int*)0; // Ok. |
192 | int *p = &(*(int*)0); // Ok; |
193 | } |
194 | |
195 | int test20(int x) { |
196 | return x && 4; // expected-warning {{use of logical '&&' with constant operand}} \ |
197 | // expected-note {{use '&' for a bitwise operation}} \ |
198 | // expected-note {{remove constant to silence this warning}} |
199 | |
200 | return x && sizeof(int) == 4; // no warning, RHS is logical op. |
201 | |
202 | // no warning, this is an idiom for "true" in old C style. |
203 | return x && (signed char)1; |
204 | |
205 | return x || 0; |
206 | return x || 1; |
207 | return x || -1; // expected-warning {{use of logical '||' with constant operand}} \ |
208 | // expected-note {{use '|' for a bitwise operation}} |
209 | return x || 5; // expected-warning {{use of logical '||' with constant operand}} \ |
210 | // expected-note {{use '|' for a bitwise operation}} |
211 | return x && 0; |
212 | return x && 1; |
213 | return x && -1; // expected-warning {{use of logical '&&' with constant operand}} \ |
214 | // expected-note {{use '&' for a bitwise operation}} \ |
215 | // expected-note {{remove constant to silence this warning}} |
216 | return x && 5; // expected-warning {{use of logical '&&' with constant operand}} \ |
217 | // expected-note {{use '&' for a bitwise operation}} \ |
218 | // expected-note {{remove constant to silence this warning}} |
219 | return x || (0); |
220 | return x || (1); |
221 | return x || (-1); // expected-warning {{use of logical '||' with constant operand}} \ |
222 | // expected-note {{use '|' for a bitwise operation}} |
223 | return x || (5); // expected-warning {{use of logical '||' with constant operand}} \ |
224 | // expected-note {{use '|' for a bitwise operation}} |
225 | return x && (0); |
226 | return x && (1); |
227 | return x && (-1); // expected-warning {{use of logical '&&' with constant operand}} \ |
228 | // expected-note {{use '&' for a bitwise operation}} \ |
229 | // expected-note {{remove constant to silence this warning}} |
230 | return x && (5); // expected-warning {{use of logical '&&' with constant operand}} \ |
231 | // expected-note {{use '&' for a bitwise operation}} \ |
232 | // expected-note {{remove constant to silence this warning}} |
233 | |
234 | } |
235 | |
236 | struct Test21; // expected-note 2 {{forward declaration}} |
237 | void test21(volatile struct Test21 *ptr) { |
238 | void test21_help(void); |
239 | (test21_help(), *ptr); // expected-error {{incomplete type 'struct Test21' where a complete type is required}} |
240 | (*ptr, test21_help()); // expected-error {{incomplete type 'struct Test21' where a complete type is required}} |
241 | } |
242 | |
243 | // Make sure we do function/array decay. |
244 | void test22() { |
245 | if ("help") |
246 | (void) 0; |
247 | |
248 | if (test22) // expected-warning {{address of function 'test22' will always evaluate to 'true'}} \ |
249 | // expected-note {{prefix with the address-of operator to silence this warning}} |
250 | (void) 0; |
251 | |
252 | if (&test22) |
253 | (void) 0; |
254 | } |
255 | |