1/* Contributed by Nicola Pero <nicola.pero@meta-innovation.com>, June 2011.  */
2/* { dg-do compile } */
3
4@class NotKnown;
5
6@protocol MyProtocol
7+ (id) classMethod;
8- (id) instanceMethod;
9@end
10
11@protocol MyProtocol2
12+ (id) classMethod2;
13- (id) instanceMethod2;
14@end
15
16void test (Class x, Class <MyProtocol> y, id w, id <MyProtocol> z, NotKnown *a, NotKnown <MyProtocol> *b)
17{
18  /* "Class x" means that "x" responds to any class methods, and may
19     also respond to instance methods because instance methods of the
20     root class are class methods.  */
21  [x classMethod]; /* No warning here.  */
22
23  [x instanceMethod]; /* No warning here.  */
24
25
26  /* "Class <MyProtocol> y" means that "y" responds to any class
27     methods specified in the protocol MyProtocol, but not to other
28     class or instance methods.  If a class method is not found, an
29     instance method from the protocol may be used instead but that is
30     suspicious and gets a warning.  */
31  [y classMethod]; /* No warning here.  */
32
33  [y instanceMethod]; /* { dg-warning "found .\\-instanceMethod. instead of .\\+instanceMethod. in protocol" } */
34
35  [y classMethod2]; /* { dg-warning ".\\+classMethod2. not found in protocol" } */
36
37  [y instanceMethod2]; /* { dg-warning ".\\+instanceMethod2. not found in protocol" } */
38
39
40  /* If a class is specified by name, the @interface must be available
41     to check what it responds to.  */
42  [NotKnown classMethod]; /* { dg-warning ".interface of class .NotKnown. not found" } */
43
44
45  /* "id w" means that "w" responds to anything, both class and
46     instance methods.  */
47  [w instanceMethod]; /* No warning here.  */
48
49  [w instanceMethod2]; /* No warning here.  */
50
51  [w classMethod]; /* No warning here.  */
52
53  [w classMethod2]; /* No warning here.  */
54
55
56  /* "id <MyProtocol> z" means that "z" responds to any instance
57     methods in the protocol, but not class methods.  To select class
58     methods, you use "Class <MyProtocol> z".  */
59  [z instanceMethod]; /* No warning here.  */
60
61  [z instanceMethod2]; /* { dg-warning ".\\-instanceMethod2. not found in protocol" } */
62
63  [z classMethod];     /* { dg-warning ".\\-classMethod. not found in protocol" } */
64
65  [z classMethod2];    /* { dg-warning ".\\-classMethod2. not found in protocol" } */
66
67
68  /* "NotKnown *a" means that "a" is an instance of NotKnown.  Since
69     the programmer explicitly specified the class name, it must be
70     because they expect the compiler to do type-checking; the
71     @interface must be available to do this check, otherwise the
72     compiler does not know what "a" responds to.  */
73  [a instanceMethod];  /* { dg-warning ".interface of class .NotKnown. not found" } */
74
75  /* But, if you cast it to "id", then you're disabling type-checking
76     and the warnings should go away.  */
77  [(id)a instanceMethod]; /* No warning here.  */
78
79
80  /* "NotKnown <MyProtocol> *b" means that "a" is an instance of
81     NotKnown, and also implements protocol <MyProtocol>.  If you send
82     a message that is part of the protocol, then the compiler can do
83     type-checking and all is fine.  */
84  [b instanceMethod];
85
86  /* But if you send a message that is not part of the protocol, then
87     you'll get a warning that the method can not be found in the
88     protocol.  */
89  [b instanceMethod2]; /* { dg-warning ".\\-instanceMethod2. not found in protocol" } */
90
91  /* But, if you cast it to "id", then you're disabling type-checking
92     and the warnings should go away.  */
93  [(id)b instanceMethod2]; /* No warning here.  */
94}
95