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 return R; 101 } 102 103 // PR3562 104 void test10(int n,...) { 105 struct S { 106 double a[n]; // expected-error {{fields must have a constant size}} 107 } s; 108 double x = s.a[0]; // should not get another error here. 109 } 110 111 112 #define MYMAX(A,B) __extension__ ({ __typeof__(A) __a = (A); __typeof__(B) __b = (B); __a < __b ? __b : __a; }) 113 114 struct mystruct {int A; }; 115 void test11(struct mystruct P, float F) { 116 MYMAX(P, F); // expected-error {{invalid operands to binary expression ('typeof (P)' (aka 'struct mystruct') and 'typeof (F)' (aka 'float'))}} 117 } 118 119 // PR3753 120 int test12(const char *X) { 121 return X == "foo"; // expected-warning {{comparison against a string literal is unspecified (use strncmp instead)}} 122 } 123 124 int test12b(const char *X) { 125 return sizeof(X == "foo"); // no-warning 126 } 127 128 // rdar://6719156 129 void test13( 130 void (^P)()) { // expected-error {{blocks support disabled - compile with -fblocks}} 131 P(); 132 P = ^(){}; // expected-error {{blocks support disabled - compile with -fblocks}} 133 } 134 135 void test14() { 136 typedef long long __m64 __attribute__((__vector_size__(8))); 137 typedef short __v4hi __attribute__((__vector_size__(8))); 138 139 // Ok. 140 __v4hi a; 141 __m64 mask = (__m64)((__v4hi)a > (__v4hi)a); 142 } 143 144 145 // PR5242 146 typedef unsigned long *test15_t; 147 148 test15_t test15(void) { 149 return (test15_t)0 + (test15_t)0; // expected-error {{invalid operands to binary expression ('test15_t' (aka 'unsigned long *') and 'test15_t')}} 150 } 151 152 // rdar://7446395 153 void test16(float x) { x == ((void*) 0); } // expected-error {{invalid operands to binary expression}} 154 155 // PR6004 156 void test17(int x) { 157 x = x / 0; // expected-warning {{division by zero is undefined}} 158 x = x % 0; // expected-warning {{remainder by zero is undefined}} 159 x /= 0; // expected-warning {{division by zero is undefined}} 160 x %= 0; // expected-warning {{remainder by zero is undefined}} 161 162 x = sizeof(x/0); // no warning. 163 } 164 165 // PR6501 & PR11857 166 void test18_a(int a); // expected-note 2 {{'test18_a' declared here}} 167 void test18_b(int); // expected-note {{'test18_b' declared here}} 168 void test18_c(int a, int b); // expected-note 2 {{'test18_c' declared here}} 169 void test18_d(int a, ...); // expected-note {{'test18_d' declared here}} 170 void test18_e(int a, int b, ...); // expected-note {{'test18_e' declared here}} 171 void test18(int b) { 172 test18_a(b, b); // expected-error {{too many arguments to function call, expected single argument 'a', have 2}} 173 test18_a(); // expected-error {{too few arguments to function call, single argument 'a' was not specified}} 174 test18_b(); // expected-error {{too few arguments to function call, expected 1, have 0}} 175 test18_c(b); // expected-error {{too few arguments to function call, expected 2, have 1}} 176 test18_c(b, b, b); // expected-error {{too many arguments to function call, expected 2, have 3}} 177 test18_d(); // expected-error {{too few arguments to function call, at least argument 'a' must be specified}} 178 test18_e(); // expected-error {{too few arguments to function call, expected at least 2, have 0}} 179 } 180 181 // PR7569 182 void test19() { 183 *(int*)0 = 0; // expected-warning {{indirection of non-volatile null pointer}} \ 184 // expected-note {{consider using __builtin_trap}} 185 *(volatile int*)0 = 0; // Ok. 186 187 // rdar://9269271 188 int x = *(int*)0; // expected-warning {{indirection of non-volatile null pointer}} \ 189 // expected-note {{consider using __builtin_trap}} 190 int x2 = *(volatile int*)0; // Ok. 191 int *p = &(*(int*)0); // Ok; 192 } 193 194 int test20(int x) { 195 return x && 4; // expected-warning {{use of logical '&&' with constant operand}} \ 196 // expected-note {{use '&' for a bitwise operation}} \ 197 // expected-note {{remove constant to silence this warning}} 198 199 return x && sizeof(int) == 4; // no warning, RHS is logical op. 200 201 // no warning, this is an idiom for "true" in old C style. 202 return x && (signed char)1; 203 204 return x || 0; 205 return x || 1; 206 return x || -1; // expected-warning {{use of logical '||' with constant operand}} \ 207 // expected-note {{use '|' for a bitwise operation}} 208 return x || 5; // expected-warning {{use of logical '||' with constant operand}} \ 209 // expected-note {{use '|' for a bitwise operation}} 210 return x && 0; 211 return x && 1; 212 return x && -1; // expected-warning {{use of logical '&&' with constant operand}} \ 213 // expected-note {{use '&' for a bitwise operation}} \ 214 // expected-note {{remove constant to silence this warning}} 215 return x && 5; // expected-warning {{use of logical '&&' with constant operand}} \ 216 // expected-note {{use '&' for a bitwise operation}} \ 217 // expected-note {{remove constant to silence this warning}} 218 return x || (0); 219 return x || (1); 220 return x || (-1); // expected-warning {{use of logical '||' with constant operand}} \ 221 // expected-note {{use '|' for a bitwise operation}} 222 return x || (5); // expected-warning {{use of logical '||' with constant operand}} \ 223 // expected-note {{use '|' for a bitwise operation}} 224 return x && (0); 225 return x && (1); 226 return x && (-1); // expected-warning {{use of logical '&&' with constant operand}} \ 227 // expected-note {{use '&' for a bitwise operation}} \ 228 // expected-note {{remove constant to silence this warning}} 229 return x && (5); // expected-warning {{use of logical '&&' with constant operand}} \ 230 // expected-note {{use '&' for a bitwise operation}} \ 231 // expected-note {{remove constant to silence this warning}} 232 233 } 234 235 struct Test21; // expected-note 2 {{forward declaration}} 236 void test21(volatile struct Test21 *ptr) { 237 void test21_help(void); 238 (test21_help(), *ptr); // expected-error {{incomplete type 'struct Test21' where a complete type is required}} 239 (*ptr, test21_help()); // expected-error {{incomplete type 'struct Test21' where a complete type is required}} 240 } 241 242 // Make sure we do function/array decay. 243 void test22() { 244 if ("help") 245 (void) 0; 246 247 if (test22) 248 (void) 0; 249 } 250