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