1// RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s
2
3#define nil (void *)0;
4
5extern void foo();
6
7@protocol MyProtocol
8- (void) foo;
9+ (void) bar;
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  Class<MyProtocol> obj_CP = nil;
27
28  /* Assigning to an 'id' variable should never
29     generate a warning.  */
30  obj = obj_p;  /* Ok  */
31  obj = obj_c;  /* Ok  */
32  obj = obj_cp; /* Ok  */
33  obj = obj_C;  /* Ok  */
34  obj = obj_CP;  /* Ok  */
35
36  /* Assigning to a 'MyClass *' variable should always generate a
37     warning, unless done from an 'id'.  */
38  obj_c = obj;    /* Ok */
39  obj_c = obj_p;  // expected-warning {{assigning to 'MyClass *' from incompatible type 'id<MyProtocol>'}}
40  obj_c = obj_cp; // expected-warning {{incompatible pointer types assigning to 'MyClass *' from 'MyOtherClass *'}}
41  obj_c = obj_C;  // expected-warning {{incompatible pointer types assigning to 'MyClass *' from 'Class'}}
42  obj_c = obj_CP; // expected-warning {{incompatible pointer types assigning to 'MyClass *' from 'Class<MyProtocol>'}}
43
44  /* Assigning to an 'id<MyProtocol>' variable should generate a
45     warning if done from a 'MyClass *' (which doesn't implement
46     MyProtocol), but not from an 'id' or from a 'MyOtherClass *'
47     (which implements MyProtocol).  */
48  obj_p = obj;    /* Ok */
49  obj_p = obj_c;  // expected-warning {{assigning to 'id<MyProtocol>' from incompatible type 'MyClass *'}}
50  obj_p = obj_cp; /* Ok  */
51  obj_p = obj_C;  // expected-warning {{incompatible pointer types assigning to 'id<MyProtocol>' from 'Class'}}
52  obj_p = obj_CP; // expected-warning {{assigning to 'id<MyProtocol>' from incompatible type 'Class<MyProtocol>'}}
53
54  /* Assigning to a 'MyOtherClass *' variable should always generate
55     a warning, unless done from an 'id' or an 'id<MyProtocol>' (since
56     MyOtherClass implements MyProtocol).  */
57  obj_cp = obj;    /* Ok */
58  obj_cp = obj_c;  // expected-warning {{incompatible pointer types assigning to 'MyOtherClass *' from 'MyClass *'}}
59  obj_cp = obj_p;  /* Ok */
60  obj_cp = obj_C;  // expected-warning {{incompatible pointer types assigning to 'MyOtherClass *' from 'Class'}}
61  obj_cp = obj_CP; // expected-warning {{incompatible pointer types assigning to 'MyOtherClass *' from 'Class<MyProtocol>'}}
62
63  obj_C = obj;     // Ok
64  obj_C = obj_p;   // expected-warning {{incompatible pointer types assigning to 'Class' from 'id<MyProtocol>'}}
65  obj_C = obj_c;   // expected-warning {{incompatible pointer types assigning to 'Class' from 'MyClass *'}}
66  obj_C = obj_cp;  // expected-warning {{incompatible pointer types assigning to 'Class' from 'MyOtherClass *'}}
67  obj_C = obj_CP;  // Ok
68
69  obj_CP = obj;     // Ok
70  obj_CP = obj_p;   // expected-warning {{assigning to 'Class<MyProtocol>' from incompatible type 'id<MyProtocol>'}}
71  obj_CP = obj_c;   // expected-warning {{incompatible pointer types assigning to 'Class<MyProtocol>' from 'MyClass *}}
72  obj_CP = obj_cp;  // expected-warning {{incompatible pointer types assigning to 'Class<MyProtocol>' from 'MyOtherClass *'}}
73  obj_CP = obj_C;   // Ok
74
75  /* Any comparison involving an 'id' must be without warnings.  */
76  if (obj == obj_p) foo();  /* Ok  */ /*Bogus warning here in 2.95.4*/
77  if (obj_p == obj) foo();  /* Ok  */
78  if (obj == obj_c) foo();  /* Ok  */
79  if (obj_c == obj) foo();  /* Ok  */
80  if (obj == obj_cp) foo(); /* Ok  */
81  if (obj_cp == obj) foo(); /* Ok  */
82  if (obj == obj_C) foo();  /* Ok  */
83  if (obj_C == obj) foo();  /* Ok  */
84  if (obj == obj_CP) foo(); /* Ok  */
85  if (obj_CP == obj) foo(); /* Ok  */
86
87  /* Any comparison between 'MyClass *' and anything which is not an 'id'
88     must generate a warning.  */
89  if (obj_c == obj_p) foo();  // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'id<MyProtocol>')}}
90  if (obj_p == obj_c) foo();  // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'MyClass *')}}
91
92  if (obj_c == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'MyOtherClass *')}}
93  if (obj_cp == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'MyClass *')}}
94
95  if (obj_c == obj_C) foo();  // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'Class')}}
96  if (obj_C == obj_c) foo();  // expected-warning {{comparison of distinct pointer types ('Class' and 'MyClass *')}}
97
98  if (obj_c == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'Class<MyProtocol>')}}
99  if (obj_CP == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'MyClass *')}}
100
101  /* Any comparison between 'MyOtherClass *' (which implements
102     MyProtocol) and an 'id' implementing MyProtocol are Ok.  */
103  if (obj_p == obj_cp) foo();  /* Ok */
104  if (obj_cp == obj_p) foo();  /* Ok */
105
106  if (obj_p == obj_C) foo();   // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class')}}
107  if (obj_C == obj_p) foo();   // expected-warning {{comparison of distinct pointer types ('Class' and 'id<MyProtocol>')}}
108
109  if (obj_p == obj_CP) foo();  // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class<MyProtocol>')}}
110  if (obj_CP == obj_p) foo();  // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'id<MyProtocol>')}}
111
112  /* Comparisons between MyOtherClass * and Class types is a warning */
113  if (obj_cp == obj_C) foo();  // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'Class')}}
114  if (obj_C == obj_cp) foo();  // expected-warning {{comparison of distinct pointer types ('Class' and 'MyOtherClass *')}}
115
116  if (obj_cp == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'Class<MyProtocol>')}}
117  if (obj_CP == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'MyOtherClass *')}}
118
119  /* Comparisons between a Class and a Class<MyProtocol> are ok */
120  if (obj_C == obj_CP) foo(); /* Ok */
121  if (obj_CP == obj_C) foo(); /* Ok */
122
123  return 0;
124}
125