1 // RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s 2 3 #define nil (void *)0; 4 #define Nil (void *)0; 5 6 extern void foo(); 7 8 @protocol MyProtocol 9 - (void) foo; 10 @end 11 12 @interface MyClass 13 @end 14 15 @interface MyOtherClass <MyProtocol> 16 - (void) foo; 17 @end 18 19 int main() 20 { 21 id obj = nil; 22 id<MyProtocol> obj_p = nil; 23 MyClass *obj_c = nil; 24 MyOtherClass *obj_cp = nil; 25 Class obj_C = Nil; 26 27 /* Assigning to an 'id' variable should never 28 generate a warning. */ 29 obj = obj_p; /* Ok */ 30 obj = obj_c; /* Ok */ 31 obj = obj_cp; /* Ok */ 32 obj = obj_C; /* Ok */ 33 34 /* Assigning to a 'MyClass *' variable should always generate a 35 warning, unless done from an 'id'. */ 36 obj_c = obj; /* Ok */ 37 obj_c = obj_cp; // // expected-warning {{incompatible pointer types assigning to 'MyClass *' from 'MyOtherClass *'}} 38 obj_c = obj_C; // expected-warning {{incompatible pointer types assigning to 'MyClass *' from 'Class'}} 39 40 /* Assigning to an 'id<MyProtocol>' variable should generate a 41 warning if done from a 'MyClass *' (which doesn't implement 42 MyProtocol), but not from an 'id' or from a 'MyOtherClass *' 43 (which implements MyProtocol). */ 44 obj_p = obj; /* Ok */ 45 obj_p = obj_c; // expected-warning {{assigning to 'id<MyProtocol>' from incompatible type 'MyClass *'}} 46 obj_p = obj_cp; /* Ok */ 47 obj_p = obj_C; // expected-warning {{incompatible pointer types assigning to 'id<MyProtocol>' from 'Class'}} 48 49 /* Assigning to a 'MyOtherClass *' variable should always generate 50 a warning, unless done from an 'id' or an 'id<MyProtocol>' (since 51 MyOtherClass implements MyProtocol). */ 52 obj_cp = obj; /* Ok */ 53 obj_cp = obj_c; // expected-warning {{incompatible pointer types assigning to 'MyOtherClass *' from 'MyClass *'}} 54 obj_cp = obj_p; /* Ok */ 55 obj_cp = obj_C; // expected-warning {{incompatible pointer types assigning to 'MyOtherClass *' from 'Class'}} 56 57 /* Any comparison involving an 'id' must be without warnings. */ 58 if (obj == obj_p) foo() ; /* Ok */ /*Bogus warning here in 2.95.4*/ 59 if (obj_p == obj) foo() ; /* Ok */ 60 if (obj == obj_c) foo() ; /* Ok */ 61 if (obj_c == obj) foo() ; /* Ok */ 62 if (obj == obj_cp) foo() ; /* Ok */ 63 if (obj_cp == obj) foo() ; /* Ok */ 64 if (obj == obj_C) foo() ; /* Ok */ 65 if (obj_C == obj) foo() ; /* Ok */ 66 67 /* Any comparison between 'MyClass *' and anything which is not an 'id' 68 must generate a warning. */ 69 if (obj_p == obj_c) foo() ; // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'MyClass *')}} 70 71 if (obj_c == obj_cp) foo() ; // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'MyOtherClass *')}} 72 if (obj_cp == obj_c) foo() ; // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'MyClass *')}} 73 74 if (obj_c == obj_C) foo() ; 75 if (obj_C == obj_c) foo() ; 76 77 /* Any comparison between 'MyOtherClass *' (which implements 78 MyProtocol) and an 'id' implementing MyProtocol are Ok. */ 79 if (obj_cp == obj_p) foo() ; /* Ok */ 80 if (obj_p == obj_cp) foo() ; /* Ok */ 81 82 83 if (obj_p == obj_C) foo() ; 84 if (obj_C == obj_p) foo() ; 85 if (obj_cp == obj_C) foo() ; 86 if (obj_C == obj_cp) foo() ; 87 88 return 0; 89 } 90
