1/* Test various ObjC types assignments and comparisons.  */
2/* Author: Nicola Pero <nicola@brainstorm.co.uk>.  */
3/* { dg-do compile } */
4
5#include <objc/objc.h>
6
7@protocol MyProtocol
8- (void) foo;
9@end
10
11@interface MyClass
12@end
13
14@interface MyOtherClass <MyProtocol>
15- (void) foo;
16@end
17
18int main()
19{
20  id obj = nil;
21  id<MyProtocol> obj_p = nil;
22  MyClass *obj_c = nil;
23  MyOtherClass *obj_cp = nil;
24  Class obj_C = Nil;
25
26  /* Assigning to an 'id' variable should never
27     generate a warning.  */
28  obj = obj_p;  /* Ok  */
29  obj = obj_c;  /* Ok  */
30  obj = obj_cp; /* Ok  */
31  obj = obj_C;  /* Ok  */
32
33  /* Assigning to a 'MyClass *' variable should always generate a
34     warning, unless done from an 'id'.  */
35  obj_c = obj;    /* Ok */
36  obj_c = obj_p;  /* { dg-warning "distinct Objective\\-C type" } */
37  obj_c = obj_cp; /* { dg-warning "distinct Objective\\-C type" } */
38  obj_c = obj_C;  /* { dg-warning "distinct Objective\\-C type" } */
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;  /* { dg-warning "does not implement" } */
46  obj_p = obj_cp; /* Ok  */
47  obj_p = obj_C;  /* { dg-warning "distinct Objective\\-C type" } */
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;  /* { dg-warning "distinct Objective\\-C type" } */
54  obj_cp = obj_p;  /* Ok */
55  obj_cp = obj_C;  /* { dg-warning "distinct Objective\\-C type" } */
56
57  /* Any comparison involving an 'id' must be without warnings.  */
58  if (obj == obj_p) ;  /* Ok  */ /*Bogus warning here in 2.95.4*/
59  if (obj_p == obj) ;  /* Ok  */
60  if (obj == obj_c) ;  /* Ok  */
61  if (obj_c == obj) ;  /* Ok  */
62  if (obj == obj_cp) ; /* Ok  */
63  if (obj_cp == obj) ; /* Ok  */
64  if (obj == obj_C) ;  /* Ok  */
65  if (obj_C == obj) ;  /* Ok  */
66
67  /* Any comparison between 'MyClass *' and anything which is not an 'id'
68     must generate a warning.  */
69  if (obj_c == obj_p) ; /* { dg-warning "lacks a cast" } */
70  if (obj_p == obj_c) ; /* { dg-warning "lacks a cast" } */
71  if (obj_c == obj_cp) ; /* { dg-warning "lacks a cast" } */
72  if (obj_cp == obj_c) ; /* { dg-warning "lacks a cast" } */
73  if (obj_c == obj_C) ;  /* { dg-warning "lacks a cast" } */
74  if (obj_C == obj_c) ;  /* { dg-warning "lacks a cast" } */
75
76  /* Any comparison between 'MyOtherClass *' (which implements
77     MyProtocol) and an 'id' implementing MyProtocol are Ok.  */
78  if (obj_cp == obj_p) ; /* Ok */
79  if (obj_p == obj_cp) ; /* Ok */
80
81
82  if (obj_p == obj_C) ; /* { dg-warning "lacks a cast" } */
83  if (obj_C == obj_p) ; /* { dg-warning "lacks a cast" } */
84  if (obj_cp == obj_C) ; /* { dg-warning "lacks a cast" } */
85  if (obj_C == obj_cp) ; /* { dg-warning "lacks a cast" } */
86
87  return 0;
88}
89