1 // RUN: %clang_cc1 -fsyntax-only -verify %s -Wincompatible-pointer-types 2 3 int var __attribute__((overloadable)); // expected-error{{'overloadable' attribute only applies to functions}} 4 void params(void) __attribute__((overloadable(12))); // expected-error {{'overloadable' attribute takes no arguments}} 5 6 int *f(int) __attribute__((overloadable)); // expected-note{{previous overload of function is here}} 7 float *f(float); 8 int *f(int); // expected-error{{redeclaration of 'f' must have the 'overloadable' attribute}} \ 9 // expected-note{{previous declaration is here}} 10 double *f(double) __attribute__((overloadable)); // okay, new 11 12 // Ensure we don't complain about overloadable on implicitly declared functions. 13 int isdigit(int) __attribute__((overloadable)); 14 15 void test_f(int iv, float fv, double dv) { 16 int *ip = f(iv); 17 float *fp = f(fv); 18 double *dp = f(dv); 19 } 20 21 int *accept_funcptr(int (*)()) __attribute__((overloadable)); // \ 22 // expected-note{{candidate function}} 23 float *accept_funcptr(int (*)(int, double)) __attribute__((overloadable)); // \ 24 // expected-note{{candidate function}} 25 26 void test_funcptr(int (*f1)(int, double), 27 int (*f2)(int, float)) { 28 float *fp = accept_funcptr(f1); 29 accept_funcptr(f2); // expected-error{{call to 'accept_funcptr' is ambiguous}} 30 } 31 32 struct X { int x; float y; }; 33 struct Y { int x; float y; }; 34 int* accept_struct(struct X x) __attribute__((__overloadable__)); 35 float* accept_struct(struct Y y) __attribute__((overloadable)); 36 37 void test_struct(struct X x, struct Y y) { 38 int *ip = accept_struct(x); 39 float *fp = accept_struct(y); 40 } 41 42 double *f(int) __attribute__((overloadable)); // expected-error{{conflicting types for 'f'}} 43 44 double promote(float) __attribute__((__overloadable__)); // expected-note {{candidate}} 45 double promote(double) __attribute__((__overloadable__)); // expected-note {{candidate}} 46 long double promote(long double) __attribute__((__overloadable__)); // expected-note {{candidate}} 47 48 void promote(...) __attribute__((__overloadable__, __unavailable__)); // \ 49 // expected-note{{candidate function}} 50 51 void test_promote(short* sp) { 52 promote(1.0); 53 promote(sp); // expected-error{{call to unavailable function 'promote'}} 54 } 55 56 // PR6600 57 typedef double Double; 58 typedef Double DoubleVec __attribute__((vector_size(16))); 59 typedef int Int; 60 typedef Int IntVec __attribute__((vector_size(16))); 61 double magnitude(DoubleVec) __attribute__((__overloadable__)); 62 double magnitude(IntVec) __attribute__((__overloadable__)); 63 double test_p6600(DoubleVec d) { 64 return magnitude(d) * magnitude(d); 65 } 66 67 // PR7738 68 extern int __attribute__((overloadable)) f0(); // expected-error{{'overloadable' function 'f0' must have a prototype}} 69 typedef int f1_type(); 70 f1_type __attribute__((overloadable)) f1; // expected-error{{'overloadable' function 'f1' must have a prototype}} 71 72 void test() { 73 f0(); 74 f1(); 75 } 76 77 void before_local_1(int) __attribute__((overloadable)); 78 void before_local_2(int); // expected-note {{here}} 79 void before_local_3(int) __attribute__((overloadable)); 80 void local() { 81 void before_local_1(char); 82 void before_local_2(char); // expected-error {{conflicting types}} 83 void before_local_3(char) __attribute__((overloadable)); 84 void after_local_1(char); 85 void after_local_2(char) __attribute__((overloadable)); 86 void after_local_3(char) __attribute__((overloadable)); 87 } 88 void after_local_1(int) __attribute__((overloadable)); 89 void after_local_2(int); 90 void after_local_3(int) __attribute__((overloadable)); 91 92 // Make sure we allow C-specific conversions in C. 93 void conversions() { 94 void foo(char *c) __attribute__((overloadable)); 95 void foo(char *c) __attribute__((overloadable, enable_if(c, "nope.jpg"))); 96 97 void *ptr; 98 foo(ptr); 99 100 void multi_type(unsigned char *c) __attribute__((overloadable)); 101 void multi_type(signed char *c) __attribute__((overloadable)); 102 unsigned char *c; 103 multi_type(c); 104 } 105 106 // Ensure that we allow C-specific type conversions in C 107 void fn_type_conversions() { 108 void foo(void *c) __attribute__((overloadable)); 109 void foo(char *c) __attribute__((overloadable)); 110 void (*ptr1)(void *) = &foo; 111 void (*ptr2)(char *) = &foo; 112 void (*ambiguous)(int *) = &foo; // expected-error{{initializing 'void (*)(int *)' with an expression of incompatible type '<overloaded function type>'}} expected-note@-4{{candidate function}} expected-note@-3{{candidate function}} 113 void *vp_ambiguous = &foo; // expected-error{{initializing 'void *' with an expression of incompatible type '<overloaded function type>'}} expected-note@-5{{candidate function}} expected-note@-4{{candidate function}} 114 115 void (*specific1)(int *) = (void (*)(void *))&foo; // expected-warning{{incompatible function pointer types initializing 'void (*)(int *)' with an expression of type 'void (*)(void *)'}} 116 void *specific2 = (void (*)(void *))&foo; 117 118 void disabled(void *c) __attribute__((overloadable, enable_if(0, ""))); 119 void disabled(int *c) __attribute__((overloadable, enable_if(c, ""))); 120 void disabled(char *c) __attribute__((overloadable, enable_if(1, "The function name lies."))); 121 // To be clear, these should all point to the last overload of 'disabled' 122 void (*dptr1)(char *c) = &disabled; 123 void (*dptr2)(void *c) = &disabled; // expected-warning{{incompatible pointer types initializing 'void (*)(void *)' with an expression of type '<overloaded function type>'}} expected-note@-5{{candidate function made ineligible by enable_if}} expected-note@-4{{candidate function made ineligible by enable_if}} expected-note@-3{{candidate function has type mismatch at 1st parameter (expected 'void *' but has 'char *')}} 124 void (*dptr3)(int *c) = &disabled; // expected-warning{{incompatible pointer types initializing 'void (*)(int *)' with an expression of type '<overloaded function type>'}} expected-note@-6{{candidate function made ineligible by enable_if}} expected-note@-5{{candidate function made ineligible by enable_if}} expected-note@-4{{candidate function has type mismatch at 1st parameter (expected 'int *' but has 'char *')}} 125 126 void *specific_disabled = &disabled; 127 } 128 129 void incompatible_pointer_type_conversions() { 130 char charbuf[1]; 131 unsigned char ucharbuf[1]; 132 int intbuf[1]; 133 134 void foo(char *c) __attribute__((overloadable)); 135 void foo(short *c) __attribute__((overloadable)); 136 foo(charbuf); 137 foo(ucharbuf); // expected-error{{call to 'foo' is ambiguous}} expected-note@-3{{candidate function}} expected-note@-2{{candidate function}} 138 foo(intbuf); // expected-error{{call to 'foo' is ambiguous}} expected-note@-4{{candidate function}} expected-note@-3{{candidate function}} 139 140 void bar(unsigned char *c) __attribute__((overloadable)); 141 void bar(signed char *c) __attribute__((overloadable)); 142 bar(charbuf); // expected-error{{call to 'bar' is ambiguous}} expected-note@-2{{candidate function}} expected-note@-1{{candidate function}} 143 bar(ucharbuf); 144 bar(intbuf); // expected-error{{call to 'bar' is ambiguous}} expected-note@-4{{candidate function}} expected-note@-3{{candidate function}} 145 } 146 147 void dropping_qualifiers_is_incompatible() { 148 const char ccharbuf[1]; 149 volatile char vcharbuf[1]; 150 151 void foo(char *c) __attribute__((overloadable)); 152 void foo(const volatile unsigned char *c) __attribute__((overloadable)); 153 154 foo(ccharbuf); // expected-error{{call to 'foo' is ambiguous}} expected-note@-3{{candidate function}} expected-note@-2{{candidate function}} 155 foo(vcharbuf); // expected-error{{call to 'foo' is ambiguous}} expected-note@-4{{candidate function}} expected-note@-3{{candidate function}} 156 } 157 158 void overloadable_with_global() { 159 void wg_foo(void) __attribute__((overloadable)); // expected-note{{previous}} 160 void wg_foo(int) __attribute__((overloadable)); 161 } 162 163 int wg_foo; // expected-error{{redefinition of 'wg_foo' as different kind of symbol}} 164 165 #if !__has_extension(overloadable_unmarked) 166 #error "We should have unmarked overload support" 167 #endif 168 169 void to_foo0(int); 170 void to_foo0(double) __attribute__((overloadable)); // expected-note{{previous overload}} 171 void to_foo0(int); 172 void to_foo0(double); // expected-error{{must have the 'overloadable' attribute}} 173 void to_foo0(int); 174 175 void to_foo1(int) __attribute__((overloadable)); // expected-note 2{{previous overload}} 176 void to_foo1(double); 177 void to_foo1(int); // expected-error{{must have the 'overloadable' attribute}} 178 void to_foo1(double); 179 void to_foo1(int); // expected-error{{must have the 'overloadable' attribute}} 180 181 void to_foo2(int); // expected-note{{previous unmarked overload}} 182 void to_foo2(double) __attribute__((overloadable)); // expected-note 2{{previous overload}} 183 void to_foo2(int) __attribute__((overloadable)); // expected-error {{must not have the 'overloadable' attribute}} 184 void to_foo2(double); // expected-error{{must have the 'overloadable' attribute}} 185 void to_foo2(int); 186 void to_foo2(double); // expected-error{{must have the 'overloadable' attribute}} 187 void to_foo2(int); 188 189 void to_foo3(int); 190 void to_foo3(double) __attribute__((overloadable)); // expected-note{{previous overload}} 191 void to_foo3(int); 192 void to_foo3(double); // expected-error{{must have the 'overloadable' attribute}} 193 194 void to_foo4(int) __attribute__((overloadable)); // expected-note{{previous overload}} 195 void to_foo4(int); // expected-error{{must have the 'overloadable' attribute}} 196 void to_foo4(double) __attribute__((overloadable)); 197 198 void to_foo5(int); 199 void to_foo5(int); // expected-note 3{{previous unmarked overload}} 200 void to_foo5(float) __attribute__((overloadable)); 201 void to_foo5(double); // expected-error{{at most one overload for a given name may lack the 'overloadable' attribute}} 202 void to_foo5(float) __attribute__((overloadable)); 203 void to_foo5(short); // expected-error{{at most one overload for a given name may lack the 'overloadable' attribute}} 204 void to_foo5(long); // expected-error{{at most one overload for a given name may lack the 'overloadable' attribute}} 205 void to_foo5(double) __attribute__((overloadable)); 206 207 void to_foo6(int) __attribute__((enable_if(1, ""), overloadable)); // expected-note{{previous overload}} 208 void to_foo6(int) __attribute__((enable_if(1, ""))); // expected-error{{must have the 'overloadable' attribute}} 209 void to_foo6(int) __attribute__((enable_if(1, ""), overloadable)); 210 211 void to_foo7(int) __attribute__((enable_if(1, ""))); // expected-note{{previous unmarked overload}} 212 void to_foo7(int) __attribute__((enable_if(1, ""), overloadable)); // expected-error{{must not have the 'overloadable' attribute}} 213 void to_foo7(int) __attribute__((enable_if(1, ""))); 214 215 void to_foo8(char *__attribute__((pass_object_size(0)))) 216 __attribute__((enable_if(1, ""))); 217 void to_foo8(char *__attribute__((pass_object_size(0)))) 218 __attribute__((overloadable)); 219 220 void to_foo9(int); // expected-note{{previous unmarked overload}} 221 // FIXME: It would be nice if we did better with the "previous unmarked 222 // overload" diag. 223 void to_foo9(int) __attribute__((overloadable)); // expected-error{{must not have the 'overloadable' attribute}} expected-note{{previous declaration}} expected-note{{previous unmarked overload}} 224 void to_foo9(float); // expected-error{{conflicting types for 'to_foo9'}} 225 void to_foo9(float) __attribute__((overloadable)); 226 void to_foo9(double); // expected-error{{at most one overload for a given name may lack the 'overloadable' attribute}} 227 void to_foo9(double) __attribute__((overloadable)); 228 229 void to_foo10(int) __attribute__((overloadable)); 230 void to_foo10(double); // expected-note{{previous unmarked overload}} 231 // no "note: previous redecl" if no previous decl has `overloadable` 232 // spelled out 233 void to_foo10(float); // expected-error{{at most one overload for a given name may lack the 'overloadable' attribute}} 234 void to_foo10(float); // expected-error{{must have the 'overloadable' attribute}} 235 void to_foo10(float); // expected-error{{must have the 'overloadable' attribute}} 236 237 // Bug: we used to treat `__typeof__(foo)` as though it was `__typeof__(&foo)` 238 // if `foo` was overloaded with only one function that could have its address 239 // taken. 240 void typeof_function_is_not_a_pointer() { 241 void not_a_pointer(void *) __attribute__((overloadable)); 242 void not_a_pointer(char *__attribute__((pass_object_size(1)))) 243 __attribute__((overloadable)); 244 245 __typeof__(not_a_pointer) *fn; 246 247 void take_fn(void (*)(void *)); 248 // if take_fn is passed a void (**)(void *), we'll get a warning. 249 take_fn(fn); 250 } 251