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1// RUN: %clang_cc1 -fblocks %s -verify
2
3#if !__has_feature(objc_generics)
4#  error Compiler does not support Objective-C generics?
5#endif
6
7#if !__has_feature(objc_generics_variance)
8#  error Compiler does not support co- and contr-variance?
9#endif
10
11@protocol NSObject // expected-note{{'NSObject' declared here}}
12@end
13
14@protocol NSCopying // expected-note{{'NSCopying' declared here}}
15@end
16
17__attribute__((objc_root_class))
18@interface NSObject <NSObject> // expected-note{{'NSObject' defined here}}
19@end
20
21@interface NSString : NSObject <NSCopying>
22@end
23
24// --------------------------------------------------------------------------
25// Parsing parameterized classes.
26// --------------------------------------------------------------------------
27
28// Parse type parameters with a bound
29@interface PC1<T, U : NSObject*> : NSObject // expected-note{{'PC1' declared here}}
30// expected-note@-1{{type parameter 'T' declared here}}
31// expected-note@-2{{type parameter 'U' declared here}}
32// expected-note@-3{{type parameter 'U' declared here}}
33@end
34
35// Parse a type parameter with a bound that terminates in '>>'.
36@interface PC2<T : id<NSObject>> : NSObject
37@end
38
39// Parse multiple type parameters.
40@interface PC3<T, U : id> : NSObject
41@end
42
43// Parse multiple type parameters--grammatically ambiguous with protocol refs.
44@interface PC4<T, U, V> : NSObject // expected-note 2{{'PC4' declared here}}
45@end
46
47// Parse a type parameter list without a superclass.
48@interface PC5<T : id>
49@end
50
51// Parse a type parameter with name conflicts.
52@interface PC6<T, U,
53               T> : NSObject // expected-error{{redeclaration of type parameter 'T'}}
54@end
55
56// Parse Objective-C protocol references.
57@interface PC7<T> // expected-error{{cannot find protocol declaration for 'T'}}
58@end
59
60// Parse both type parameters and protocol references.
61@interface PC8<T> : NSObject <NSObject>
62@end
63
64// Type parameters with improper bounds.
65@interface PC9<T : int, // expected-error{{type bound 'int' for type parameter 'T' is not an Objective-C pointer type}}
66               U : NSString> : NSObject // expected-error{{missing '*' in type bound 'NSString' for type parameter 'U'}}
67@end
68
69// --------------------------------------------------------------------------
70// Parsing parameterized forward declarations classes.
71// --------------------------------------------------------------------------
72
73// Okay: forward declaration without type parameters.
74@class PC10;
75
76// Okay: forward declarations with type parameters.
77@class PC10<T, U : NSObject *>, PC11<T : NSObject *, U : id>; // expected-note{{type parameter 'T' declared here}}
78
79// Okay: forward declaration without type parameters following ones
80// with type parameters.
81@class PC10, PC11;
82
83// Okay: definition of class with type parameters that was formerly
84// declared with the same type parameters.
85@interface PC10<T, U : NSObject *> : NSObject
86@end
87
88// Mismatched parameters in declaration of @interface following @class.
89@interface PC11<T, U> : NSObject // expected-error{{missing type bound 'NSObject *' for type parameter 'T' in @interface}}
90@end
91
92@interface PC12<T : NSObject *> : NSObject  // expected-note{{type parameter 'T' declared here}}
93@end
94
95@class PC12;
96
97// Mismatched parameters in subsequent forward declarations.
98@class PC13<T : NSObject *>; // expected-note{{type parameter 'T' declared here}}
99@class PC13;
100@class PC13<U>; // expected-error{{missing type bound 'NSObject *' for type parameter 'U' in @class}}
101
102// Mismatch parameters in declaration of @class following @interface.
103@class PC12<T>; // expected-error{{missing type bound 'NSObject *' for type parameter 'T' in @class}}
104
105// Parameterized forward declaration a class that is not parameterized.
106@class NSObject<T>; // expected-error{{forward declaration of non-parameterized class 'NSObject' cannot have type parameters}}
107// expected-note@-1{{'NSObject' declared here}}
108
109// Parameterized forward declaration preceding the definition (that is
110// not parameterized).
111@class NSNumber<T : NSObject *>; // expected-note{{'NSNumber' declared here}}
112@interface NSNumber : NSObject // expected-error{{class 'NSNumber' previously declared with type parameters}}
113@end
114
115@class PC14;
116
117// Okay: definition of class with type parameters that was formerly
118// declared without type parameters.
119@interface PC14<T, U : NSObject *> : NSObject
120@end
121
122// --------------------------------------------------------------------------
123// Parsing parameterized categories and extensions.
124// --------------------------------------------------------------------------
125
126// Inferring type bounds
127@interface PC1<T, U> (Cat1) <NSObject>
128@end
129
130// Matching type bounds
131@interface PC1<T : id, U : NSObject *> (Cat2) <NSObject>
132@end
133
134// Inferring type bounds
135@interface PC1<T, U> () <NSObject>
136@end
137
138// Matching type bounds
139@interface PC1<T : id, U : NSObject *> () <NSObject>
140@end
141
142// Missing type parameters.
143@interface PC1<T> () // expected-error{{extension has too few type parameters (expected 2, have 1)}}
144@end
145
146// Extra type parameters.
147@interface PC1<T, U, V> (Cat3) // expected-error{{category has too many type parameters (expected 2, have 3)}}
148@end
149
150// Mismatched bounds.
151@interface PC1<T : NSObject *, // expected-error{{type bound 'NSObject *' for type parameter 'T' conflicts with implicit bound 'id'}}
152               X : id> () // expected-error{{type bound 'id' for type parameter 'X' conflicts with previous bound 'NSObject *'for type parameter 'U'}}
153@end
154
155// Parameterized category/extension of non-parameterized class.
156@interface NSObject<T> (Cat1) // expected-error{{category of non-parameterized class 'NSObject' cannot have type parameters}}
157@end
158
159@interface NSObject<T> () // expected-error{{extension of non-parameterized class 'NSObject' cannot have type parameters}}
160@end
161
162// --------------------------------------------------------------------------
163// @implementations cannot have type parameters
164// --------------------------------------------------------------------------
165@implementation PC1<T : id> // expected-error{{@implementation cannot have type parameters}}
166@end
167
168@implementation PC2<T> // expected-error{{@implementation declaration cannot be protocol qualified}}
169@end
170
171@implementation PC1<T> (Cat1) // expected-error{{@implementation cannot have type parameters}}
172@end
173
174@implementation PC1<T : id> (Cat2) // expected-error{{@implementation cannot have type parameters}}
175@end
176
177typedef T undeclaredT; // expected-error{{unknown type name 'T'}}
178
179// --------------------------------------------------------------------------
180// Interfaces involving type parameters
181// --------------------------------------------------------------------------
182@interface PC20<T : id, U : NSObject *, V : NSString *> : NSObject {
183  T object;
184}
185
186- (U)method:(V)param;
187@end
188
189@interface PC20<T, U, V> (Cat1)
190- (U)catMethod:(V)param;
191@end
192
193@interface PC20<X, Y, Z>()
194- (X)extMethod:(Y)param;
195@end
196
197// --------------------------------------------------------------------------
198// Parsing type arguments.
199// --------------------------------------------------------------------------
200
201typedef NSString * ObjCStringRef; // expected-note{{'ObjCStringRef' declared here}}
202
203// Type arguments with a mix of identifiers and type-names.
204typedef PC4<id, NSObject *, NSString *> typeArgs1;
205
206// Type arguments with only identifiers.
207typedef PC4<id, id, id> typeArgs2;
208
209// Type arguments with only identifiers; one is ambiguous (resolved as
210// types).
211typedef PC4<NSObject, id, id> typeArgs3; // expected-error{{type argument 'NSObject' must be a pointer (requires a '*')}}
212
213// Type arguments with only identifiers; one is ambiguous (resolved as
214// protocol qualifiers).
215typedef PC4<NSObject, NSCopying> protocolQuals1;
216
217// Type arguments and protocol qualifiers.
218typedef PC4<id, NSObject *, id><NSObject, NSCopying> typeArgsAndProtocolQuals1;
219
220// Type arguments and protocol qualifiers in the wrong order.
221typedef PC4<NSObject, NSCopying><id, NSObject *, id> typeArgsAndProtocolQuals2; // expected-error{{protocol qualifiers must precede type arguments}}
222
223// Type arguments and protocol qualifiers (identifiers).
224typedef PC4<id, NSObject, id><NSObject, NSCopying> typeArgsAndProtocolQuals3; // expected-error{{type argument 'NSObject' must be a pointer (requires a '*')}}
225
226// Typo correction: protocol bias.
227typedef PC4<NSCopying, NSObjec> protocolQuals2; // expected-error{{cannot find protocol declaration for 'NSObjec'; did you mean 'NSObject'?}}
228
229// Typo correction: type bias.
230typedef PC4<id, id, NSObjec> typeArgs4; // expected-error{{unknown class name 'NSObjec'; did you mean 'NSObject'?}}
231// expected-error@-1{{type argument 'NSObject' must be a pointer (requires a '*')}}
232
233// Typo correction: bias set by correction itself to a protocol.
234typedef PC4<NSObject, NSObject, NSCopyin> protocolQuals3; // expected-error{{cannot find protocol declaration for 'NSCopyin'; did you mean 'NSCopying'?}}
235
236// Typo correction: bias set by correction itself to a type.
237typedef PC4<NSObject, NSObject, ObjCStringref> typeArgs5; // expected-error{{unknown type name 'ObjCStringref'; did you mean 'ObjCStringRef'?}}
238// expected-error@-1{{type argument 'NSObject' must be a pointer (requires a '*')}}
239// expected-error@-2{{type argument 'NSObject' must be a pointer (requires a '*')}}
240
241// Type/protocol conflict.
242typedef PC4<NSCopying, ObjCStringRef> typeArgsProtocolQualsConflict1; // expected-error{{angle brackets contain both a type ('ObjCStringRef') and a protocol ('NSCopying')}}
243typedef PC4<NSCopying, NSString *> typeArgsProtocolQualsConflict2; // expected-error{{angle brackets contain both a type ('NSString') and a protocol ('NSCopying')}}
244typedef PC4<NSCopying, UnknownType, NSString *> typeArgsProtocolQualsConflict3; // expected-error{{angle brackets contain both a type ('NSString') and a protocol ('NSCopying')}} expected-error{{unknown type name 'UnknownType'}}
245typedef PC4<UnknownType, NSString *> typeArgsProtocolQualsConflict4; // expected-error{{unknown type name 'UnknownType'}}
246typedef PC4<NSString, NSCopying, NSString *> typeArgsProtocolQualsConflict5; // expected-error{{angle brackets contain both a type ('NSString') and a protocol ('NSCopying')}}
247
248// Handling the '>>' in type argument lists.
249typedef PC4<id<NSCopying>, NSObject *, id<NSObject>> typeArgs6;
250
251// --------------------------------------------------------------------------
252// Checking type arguments.
253// --------------------------------------------------------------------------
254
255@interface PC15<T : id, U : NSObject *, V : id<NSCopying>> : NSObject
256// expected-note@-1{{type parameter 'V' declared here}}
257// expected-note@-2{{type parameter 'V' declared here}}
258// expected-note@-3{{type parameter 'U' declared here}}
259@end
260
261typedef PC4<NSString *> tooFewTypeArgs1; // expected-error{{too few type arguments for class 'PC4' (have 1, expected 3)}}
262
263typedef PC4<NSString *, NSString *, NSString *, NSString *> tooManyTypeArgs1; // expected-error{{too many type arguments for class 'PC4' (have 4, expected 3)}}
264
265typedef PC15<int (^)(int, int), // block pointers as 'id'
266             NSString *, // subclass
267             NSString *> typeArgs7; // class that conforms to the protocol
268
269typedef PC15<NSObject *, NSObject *, id<NSCopying>> typeArgs8;
270
271typedef PC15<NSObject *, NSObject *,
272             NSObject *> typeArgs8b; // expected-error{{type argument 'NSObject *' does not satisfy the bound ('id<NSCopying>') of type parameter 'V'}}
273
274typedef PC15<id,
275             id,  // expected-error{{type argument 'id' does not satisfy the bound ('NSObject *') of type parameter 'U'}}
276             id> typeArgs9;
277
278typedef PC15<id, NSObject *,
279             id> typeArgs10; // expected-error{{type argument 'id' does not satisfy the bound ('id<NSCopying>') of type parameter 'V'}}
280
281typedef PC15<id,
282             int (^)(int, int), // okay
283             id<NSCopying, NSObject>> typeArgs11;
284
285typedef PC15<id, NSString *, int (^)(int, int)> typeArgs12; // okay
286
287typedef NSObject<id, id> typeArgs13; // expected-error{{type arguments cannot be applied to non-parameterized class 'NSObject'}}
288
289typedef id<id, id> typeArgs14; // expected-error{{type arguments cannot be applied to non-class type 'id'}}
290
291typedef PC1<NSObject *, NSString *> typeArgs15;
292
293typedef PC1<NSObject *, NSString *><NSCopying> typeArgsAndProtocolQuals4;
294
295typedef typeArgs15<NSCopying> typeArgsAndProtocolQuals5;
296
297typedef typeArgs15<NSObject *, NSString *> typeArgs16; // expected-error{{type arguments cannot be applied to already-specialized class type 'typeArgs15' (aka 'PC1<NSObject *,NSString *>')}}
298
299typedef typeArgs15<NSObject> typeArgsAndProtocolQuals6;
300
301void testSpecializedTypePrinting() {
302  int *ip;
303
304  ip = (typeArgs15*)0; // expected-warning{{'typeArgs15 *' (aka 'PC1<NSObject *,NSString *> *')}}
305  ip = (typeArgsAndProtocolQuals4*)0; // expected-warning{{'typeArgsAndProtocolQuals4 *' (aka 'PC1<NSObject *,NSString *><NSCopying> *')}}
306  ip = (typeArgsAndProtocolQuals5*)0; // expected-warning{{'typeArgsAndProtocolQuals5 *' (aka 'typeArgs15<NSCopying> *')}}
307  ip = (typeArgsAndProtocolQuals6)0; // expected-error{{used type 'typeArgsAndProtocolQuals6' (aka 'typeArgs15<NSObject>')}}
308  ip = (typeArgsAndProtocolQuals6*)0;// expected-warning{{'typeArgsAndProtocolQuals6 *' (aka 'typeArgs15<NSObject> *')}}
309}
310
311// --------------------------------------------------------------------------
312// Specialized superclasses
313// --------------------------------------------------------------------------
314@interface PC21<T : NSObject *> : PC1<T, T>
315@end
316
317@interface PC22<T : NSObject *> : PC1<T> // expected-error{{too few type arguments for class 'PC1' (have 1, expected 2)}}
318@end
319
320@interface PC23<T : NSObject *> : PC1<T, U> // expected-error{{unknown type name 'U'}}
321@end
322
323@interface PC24<T> : PC1<T, T> // expected-error{{type argument 'T' (aka 'id') does not satisfy the bound ('NSObject *') of type parameter 'U'}}
324@end
325
326@interface NSFoo : PC1<NSObject *, NSObject *> // okay
327@end
328
329// --------------------------------------------------------------------------
330// Co- and contra-variance.
331// --------------------------------------------------------------------------
332@class Variance1<T, U>;
333
334@class Variance1<__covariant T, __contravariant U>;
335
336@interface Variance1<__covariant T, __contravariant U> : NSObject // expected-note 2{{declared here}}
337@end
338
339@interface Variance1<T, U> () // okay, inferred
340@end
341
342@interface Variance1<T, U> (Cat1) // okay, inferred
343@end
344
345@class Variance1<T, U>; // okay, inferred
346
347@interface Variance1<__covariant T, __contravariant U> () // okay, matches
348@end
349
350@interface Variance1<__covariant T, __contravariant U> (Cat2) // okay, matches
351@end
352
353@class Variance1<__covariant T, __contravariant U>; // okay, matches
354
355@interface Variance1<__contravariant X, // expected-error{{contravariant type parameter 'X' conflicts with previous covariant type parameter 'T'}}
356                     __covariant Y> () // expected-error{{covariant type parameter 'Y' conflicts with previous contravariant type parameter 'U'}}
357@end
358
359@class Variance2<__covariant T, __contravariant U>; // expected-note 2{{declared here}}
360
361@interface Variance2<__contravariant T, // expected-error{{contravariant type parameter 'T' conflicts with previous covariant type parameter 'T'}}
362                     U> : NSObject // expected-error{{invariant type parameter 'U' conflicts with previous contravariant type parameter 'U'}}
363@end
364