1// RUN: %clang_cc1 -fsyntax-only -verify -fblocks -Wno-objc-root-class %s 2// RUN: %clang_cc1 -fsyntax-only -verify -fblocks -Wno-objc-root-class \ 3// RUN: -fcompatibility-qualified-id-block-type-checking -DCOMPATIBILITY_QUALIFIED_ID_TYPE_CHECKING=1 %s 4// test for block type safety. 5 6@interface Super @end 7@interface Sub : Super @end 8 9void f2(void(^f)(Super *)) { // expected-note{{passing argument to parameter 'f' here}} 10 Super *o; 11 f(o); 12} 13 14void f3(void(^f)(Sub *)) { 15 Sub *o; 16 f(o); 17} 18 19void r0(Super* (^f)(void)) { 20 Super *o = f(); 21} 22 23void r1(Sub* (^f)(void)) { // expected-note{{passing argument to parameter 'f' here}} 24 Sub *o = f(); 25} 26 27@protocol NSObject; 28@class NSObject; 29 30void r2 (id<NSObject> (^f) (void)) { 31 id o = f(); 32} 33 34void test1(void) { 35 f2(^(Sub *o) { }); // expected-error {{incompatible block pointer types passing}} 36 f3(^(Super *o) { }); // OK, block taking Super* may be called with a Sub* 37 38 r0(^Super* (void) { return 0; }); // OK 39 r0(^Sub* (void) { return 0; }); // OK, variable of type Super* gets return value of type Sub* 40 r0(^id (void) { return 0; }); 41 42 r1(^Super* (void) { return 0; }); // expected-error {{incompatible block pointer types passing}} 43 r1(^Sub* (void) { return 0; }); // OK 44 r1(^id (void) { return 0; }); 45 46 r2(^id<NSObject>(void) { return 0; }); 47} 48 49 50@interface A @end 51@interface B @end 52 53void f0(void (^f)(A* x)) { 54 A* a; 55 f(a); 56} 57 58void f1(void (^f)(id x)) { 59 B *b; 60 f(b); 61} 62 63void test2(void) 64{ 65 f0(^(id a) { }); // OK 66 f1(^(A* a) { }); 67 f1(^(id<NSObject> a) { }); // OK 68} 69 70@interface NSArray 71 // Calls block() with every object in the array 72 -enumerateObjectsWithBlock:(void (^)(id obj))block; 73@end 74 75@interface MyThing 76-(void) printThing; 77@end 78 79@implementation MyThing 80 static NSArray* myThings; // array of MyThing* 81 82 -(void) printThing { } 83 84// programmer wants to write this: 85 -printMyThings1 { 86 [myThings enumerateObjectsWithBlock: ^(MyThing *obj) { 87 [obj printThing]; 88 }]; 89 } 90 91// strict type safety requires this: 92 -printMyThings { 93 [myThings enumerateObjectsWithBlock: ^(id obj) { 94 MyThing *obj2 = (MyThing *)obj; 95 [obj2 printThing]; 96 }]; 97 } 98@end 99 100@protocol P, P2; 101void f4(void (^f)(id<P> x)) { // expected-note{{passing argument to parameter 'f' here}} 102 NSArray<P2> *b; 103 f(b); // expected-warning {{passing 'NSArray<P2> *' to parameter of incompatible type 'id<P>'}} 104} 105 106void test3(void) { 107 f4(^(NSArray<P2>* a) { }); // expected-error {{incompatible block pointer types passing 'void (^)(NSArray<P2> *)' to parameter of type 'void (^)(id<P>)'}} 108} 109 110@protocol Foo @end 111 112@interface Baz @end 113 114@interface Baz(FooConformance) <Foo> 115@end 116 117@implementation Baz @end 118 119int test4 (void) { 120 id <Foo> (^b)(void) = ^{ // Doesn't work 121 return (Baz *)0; 122 }; 123 return 0; 124} 125 126@protocol NSCopying @end 127 128@interface NSAllArray <NSCopying> 129@end 130 131@interface NSAllArray (FooConformance) <Foo> 132@end 133 134#ifndef COMPATIBILITY_QUALIFIED_ID_TYPE_CHECKING 135int test5(void) { 136 // Returned value is used outside of a block, so error on changing 137 // a return type to a more general than expected. 138 NSAllArray *(^block)(id); 139 id <Foo> (^genericBlock)(id); 140 genericBlock = block; 141 block = genericBlock; // expected-error {{incompatible block pointer types assigning to 'NSAllArray *(^)(id)' from 'id<Foo> (^)(id)'}} 142 143 // A parameter is used inside a block, so error on changing a parameter type 144 // to a more specific than an argument type it will be called with. 145 void (^blockWithParam)(NSAllArray *); 146 void (^genericBlockWithParam)(id<Foo>); 147 genericBlockWithParam = blockWithParam; // expected-error {{incompatible block pointer types assigning to 'void (^)(id<Foo>)' from 'void (^)(NSAllArray *)'}} 148 blockWithParam = genericBlockWithParam; 149 return 0; 150} 151#else 152// In Apple SDK APIs using NSItemProviderCompletionHandler require to work with 153// blocks that have parameters more specific than in method signatures. As 154// explained in non-compatibility test above, it is not safe in general. But 155// to keep existing code working we support a compatibility mode that uses 156// previous type checking. 157int test5(void) { 158 NSAllArray *(^block)(id); 159 id <Foo> (^genericBlock)(id); 160 genericBlock = block; 161 block = genericBlock; // expected-error {{incompatible block pointer types assigning to 'NSAllArray *(^)(id)' from 'id<Foo> (^)(id)'}} 162 163 void (^blockWithParam)(NSAllArray *); 164 void (^genericBlockWithParam)(id<Foo>); 165 genericBlockWithParam = blockWithParam; 166 blockWithParam = genericBlockWithParam; 167 return 0; 168} 169#endif 170 171typedef int NSInteger; 172 173typedef enum : NSInteger {NSOrderedAscending = -1L, NSOrderedSame, NSOrderedDescending} NSComparisonResult; 174 175typedef NSComparisonResult (^NSComparator)(id obj1, id obj2); 176 177@interface radar10798770 178- (void)sortUsingComparator:(NSComparator)c; 179@end 180 181void f(void) { 182 radar10798770 *f; 183 [f sortUsingComparator:^(id a, id b) { 184 return NSOrderedSame; 185 }]; 186} 187 188@protocol P1 @end 189@protocol P2 @end 190 191void Test(void) { 192void (^aBlock)(void); 193id anId = aBlock; // OK 194 195id<P1,P2> anQualId = aBlock; // expected-error {{initializing 'id<P1,P2>' with an expression of incompatible type 'void (^)(void)'}} 196 197NSArray* anArray = aBlock; // expected-error {{initializing 'NSArray *' with an expression of incompatible type 'void (^)(void)'}} 198 199aBlock = anId; // OK 200 201id<P1,P2> anQualId1; 202aBlock = anQualId1; // expected-error {{assigning to 'void (^)(void)' from incompatible type 'id<P1,P2>'}} 203 204NSArray* anArray1; 205aBlock = anArray1; // expected-error {{assigning to 'void (^)(void)' from incompatible type 'NSArray *'}} 206} 207 208void Test2(void) { 209 void (^aBlock)(void); 210 id<NSObject> anQualId1 = aBlock; // Ok 211 id<NSObject, NSCopying> anQualId2 = aBlock; // Ok 212 id<NSObject, NSCopying, NSObject, NSCopying> anQualId3 = aBlock; // Ok 213 id <P1> anQualId4 = aBlock; // expected-error {{initializing 'id<P1>' with an expression of incompatible type 'void (^)(void)'}} 214 id<NSObject, P1, NSCopying> anQualId5 = aBlock; // expected-error {{initializing 'id<NSObject,P1,NSCopying>' with an expression of incompatible type 'void (^)(void)'}} 215 id<NSCopying> anQualId6 = aBlock; // Ok 216} 217 218void Test3(void) { 219 void (^aBlock)(void); 220 NSObject *NSO = aBlock; // Ok 221 NSObject<NSObject> *NSO1 = aBlock; // Ok 222 NSObject<NSObject, NSCopying> *NSO2 = aBlock; // Ok 223 NSObject<NSObject, NSCopying, NSObject, NSCopying> *NSO3 = aBlock; // Ok 224 NSObject <P1> *NSO4 = aBlock; // expected-error {{initializing 'NSObject<P1> *' with an expression of incompatible type 'void (^)(void)'}} 225 NSObject<NSObject, P1, NSCopying> *NSO5 = aBlock; // expected-error {{initializing 'NSObject<NSObject,P1,NSCopying> *' with an expression of incompatible type 'void (^)(void)'}} 226 NSObject<NSCopying> *NSO6 = aBlock; // Ok 227} 228 229typedef NSObject<P1> NSObject_P1; 230typedef NSObject_P1<P2> NSObject_P1_P2; 231 232void Test4(void (^handler)(NSObject_P1_P2 *p)) { 233 Test4(^(NSObject<P2> *p) { }); 234} 235