1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
| // RUN: %clang_cc1 -verify -Wno-deprecated-declarations -Wno-objc-root-class %s
@interface Unrelated
@end
@interface NSObject
+ (id)new;
+ (id)alloc;
- (NSObject *)init;
- (id)retain; // expected-note{{instance method 'retain' is assumed to return an instance of its receiver type ('NSArray *')}}
- autorelease;
- (id)self;
- (id)copy;
- (id)mutableCopy;
// Do not infer when instance/class mismatches
- (id)newNotInferred;
- (id)alloc;
+ (id)initWithBlarg;
+ (id)self;
// Do not infer when the return types mismatch.
- (Unrelated *)initAsUnrelated;
@end
@interface NSString : NSObject
- (id)init;
- (id)initWithCString:(const char*)string;
@end
@interface NSArray : NSObject
- (unsigned)count;
@end
@interface NSBlah
@end
@interface NSMutableArray : NSArray
@end
@interface NSBlah ()
+ (Unrelated *)newUnrelated;
@end
void test_inference() {
// Inference based on method family
__typeof__(([[NSString alloc] init])) *str = (NSString**)0;
__typeof__(([[[[NSString new] self] retain] autorelease])) *str2 = (NSString **)0;
__typeof__(([[NSString alloc] initWithCString:"blah"])) *str3 = (NSString**)0;
// Not inferred
__typeof__(([[NSString new] copy])) *id1 = (id*)0;
// Not inferred due to instance/class mismatches
__typeof__(([[NSString new] newNotInferred])) *id2 = (id*)0;
__typeof__(([[NSString new] alloc])) *id3 = (id*)0;
__typeof__(([NSString self])) *id4 = (id*)0;
__typeof__(([NSString initWithBlarg])) *id5 = (id*)0;
// Not inferred due to return type mismatch
__typeof__(([[NSString alloc] initAsUnrelated])) *unrelated = (Unrelated**)0;
__typeof__(([NSBlah newUnrelated])) *unrelated2 = (Unrelated**)0;
NSArray *arr = [[NSMutableArray alloc] init];
NSMutableArray *marr = [arr retain]; // expected-warning{{incompatible pointer types initializing 'NSMutableArray *' with an expression of type 'NSArray *'}}
}
@implementation NSBlah
+ (Unrelated *)newUnrelated {
return (Unrelated *)0;
}
@end
@implementation NSBlah (Cat)
+ (Unrelated *)newUnrelated2 {
return (Unrelated *)0;
}
@end
@interface A
- (id)initBlah; // expected-note 2{{overridden method is part of the 'init' method family}}
@end
@interface B : A
- (Unrelated *)initBlah; // expected-warning{{method is expected to return an instance of its class type 'B', but is declared to return 'Unrelated *'}}
@end
@interface C : A
@end
@implementation C
- (Unrelated *)initBlah { // expected-warning{{method is expected to return an instance of its class type 'C', but is declared to return 'Unrelated *'}}
return (Unrelated *)0;
}
@end
@interface D
+ (id)newBlarg; // expected-note{{overridden method is part of the 'new' method family}}
@end
@interface D ()
+ alloc; // expected-note{{overridden method is part of the 'alloc' method family}}
@end
@implementation D
+ (Unrelated *)newBlarg { // expected-warning{{method is expected to return an instance of its class type 'D', but is declared to return 'Unrelated *'}}
return (Unrelated *)0;
}
+ (Unrelated *)alloc { // expected-warning{{method is expected to return an instance of its class type 'D', but is declared to return 'Unrelated *'}}
return (Unrelated *)0;
}
@end
@protocol P1
- (id)initBlah; // expected-note{{overridden method is part of the 'init' method family}}
- (int)initBlarg;
@end
@protocol P2 <P1>
- (int)initBlah; // expected-warning{{protocol method is expected to return an instance of the implementing class, but is declared to return 'int'}}
- (int)initBlarg;
- (int)initBlech;
@end
@interface E
- init;
@end
@implementation E
- init {
return self;
}
@end
@protocol P3
+ (NSString *)newString;
@end
@interface F<P3>
@end
@implementation F
+ (NSString *)newString { return @"blah"; }
@end
// <rdar://problem/9340699>
@interface G
- (id)_ABC_init __attribute__((objc_method_family(init))); // expected-note {{method '_ABC_init' declared here}}
@end
@interface G (Additions)
- (id)_ABC_init2 __attribute__((objc_method_family(init)));
@end
@implementation G (Additions)
- (id)_ABC_init { // expected-warning {{category is implementing a method which will also be implemented by its primary class}}
return 0;
}
- (id)_ABC_init2 {
return 0;
}
- (id)_ABC_init3 {
return 0;
}
@end
// PR12384
@interface Fail @end
@protocol X @end
@implementation Fail
- (id<X>) initWithX // expected-note {{compiler has implicitly changed method 'initWithX' return type}}
{
return (id)self; // expected-warning {{casting 'Fail *' to incompatible type 'id<X>'}}
}
@end
// <rdar://problem/11460990>
@interface WeirdNSString : NSString
- (id)initWithCString:(const char*)string, void *blah;
@end
// rdar://14121570
@protocol PMFilterManager
@end
@interface UIViewController : NSObject
@end
@implementation UIViewController
+ (UIViewController<PMFilterManager> *)newFilterViewControllerForType // expected-note {{compiler has implicitly changed method 'newFilterViewControllerForType' return type}}
{
UIViewController<PMFilterManager> *filterVC;
return filterVC; // expected-warning {{incompatible pointer types casting 'UIViewController *' to type 'UIViewController<PMFilterManager> *'}}
}
@end
|