1// RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s
2
3#define nil (void *)0;
4#define Nil (void *)0;
5
6extern 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
19int 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