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
