// RUN: %clang_cc1 -fblocks -fsyntax-only -Wnullable-to-nonnull-conversion %s -verify
//
// Test the substitution of type arguments for type parameters when
// using parameterized classes in Objective-C.
@protocol NSObject
@end
__attribute__((objc_root_class))
@interface NSObject <NSObject>
+ (instancetype)alloc;
- (instancetype)init;
@end
@protocol NSCopying
@end
@interface NSString : NSObject <NSCopying>
@end
@interface NSMutableString : NSString
@end
@interface NSNumber : NSObject <NSCopying>
@end
@interface NSArray<T> : NSObject <NSCopying> {
@public
T *data; // don't try this at home
}
- (T)objectAtIndexedSubscript:(int)index;
+ (NSArray<T> *)array;
+ (void)setArray:(NSArray <T> *)array;
@property (copy,nonatomic) T lastObject;
@end
@interface NSMutableArray<T> : NSArray<T>
-(instancetype)initWithArray:(NSArray<T> *)array; // expected-note{{passing argument}}
- (void)setObject:(T)object atIndexedSubscript:(int)index; // expected-note 2{{passing argument to parameter 'object' here}}
@end
@interface NSStringArray : NSArray<NSString *>
@end
@interface NSSet<T> : NSObject <NSCopying>
- (T)firstObject;
@property (nonatomic, copy) NSArray<T> *allObjects;
@end
// Parameterized inheritance (simple case)
@interface NSMutableSet<U : id<NSCopying>> : NSSet<U>
- (void)addObject:(U)object; // expected-note 7{{passing argument to parameter 'object' here}}
@end
@interface Widget : NSObject <NSCopying>
@end
// Non-parameterized class inheriting from a specialization of a
// parameterized class.
@interface WidgetSet : NSMutableSet<Widget *>
@end
// Parameterized inheritance with a more interesting transformation in
// the specialization.
@interface MutableSetOfArrays<T> : NSMutableSet<NSArray<T>*>
@end
// Inheriting from an unspecialized form of a parameterized type.
@interface UntypedMutableSet : NSMutableSet
@end
@interface Window : NSObject
@end
@interface NSDictionary<K, V> : NSObject <NSCopying>
- (V)objectForKeyedSubscript:(K)key; // expected-note 2{{parameter 'key'}}
@end
@interface NSMutableDictionary<K : id<NSCopying>, V> : NSDictionary<K, V>
- (void)setObject:(V)object forKeyedSubscript:(K)key;
// expected-note@-1 {{parameter 'object' here}}
// expected-note@-2 {{parameter 'object' here}}
// expected-note@-3 {{parameter 'key' here}}
// expected-note@-4 {{parameter 'key' here}}
@property (strong) K someRandomKey;
@end
@interface WindowArray : NSArray<Window *>
@end
@interface NSSet<T> (Searching)
- (T)findObject:(T)object;
@end
@interface NSView : NSObject
@end
@interface NSControl : NSView
- (void)toggle;
@end
@interface NSViewController<ViewType : NSView *> : NSObject
@property (nonatomic,retain) ViewType view;
@end
@interface TypedefTypeParam<T> : NSObject
typedef T AliasT;
- (void)test:(AliasT)object;
// expected-note@-1 {{parameter 'object' here}}
@end
// --------------------------------------------------------------------------
// Nullability
// --------------------------------------------------------------------------
typedef NSControl * _Nonnull Nonnull_NSControl;
@interface NSNullableTest<ViewType : NSView *> : NSObject
- (ViewType)view;
- (nullable ViewType)maybeView;
@end
@interface NSNullableTest2<ViewType : NSView * _Nullable> : NSObject // expected-error{{type parameter 'ViewType' bound 'NSView * _Nullable' cannot explicitly specify nullability}}
@end
void test_nullability(void) {
NSControl * _Nonnull nonnull_NSControl;
// Nullability introduced by substitution.
NSNullableTest<NSControl *> *unspecifiedControl;
nonnull_NSControl = [unspecifiedControl view];
nonnull_NSControl = [unspecifiedControl maybeView]; // expected-warning{{from nullable pointer 'NSControl * _Nullable' to non-nullable pointer type 'NSControl * _Nonnull'}}
// Nullability overridden by substitution.
NSNullableTest<Nonnull_NSControl> *nonnullControl;
nonnull_NSControl = [nonnullControl view];
nonnull_NSControl = [nonnullControl maybeView]; // expected-warning{{from nullable pointer 'Nonnull_NSControl _Nullable' (aka 'NSControl *') to non-nullable pointer type 'NSControl * _Nonnull'}}
// Nullability cannot be specified directly on a type argument.
NSNullableTest<NSControl * _Nonnull> *nonnullControl2; // expected-error{{type argument 'NSControl *' cannot explicitly specify nullability}}
}
// --------------------------------------------------------------------------
// Message sends.
// --------------------------------------------------------------------------
void test_message_send_result(
NSSet<NSString *> *stringSet,
NSMutableSet<NSString *> *mutStringSet,
WidgetSet *widgetSet,
UntypedMutableSet *untypedMutSet,
MutableSetOfArrays<NSString *> *mutStringArraySet,
NSSet *set,
NSMutableSet *mutSet,
MutableSetOfArrays *mutArraySet,
NSArray<NSString *> *stringArray,
NSArray<__kindof NSString *> *kindofStringArray,
void (^block)(void)) {
int *ip;
ip = [stringSet firstObject]; // expected-warning{{from 'NSString *'}}
ip = [mutStringSet firstObject]; // expected-warning{{from 'NSString *'}}
ip = [widgetSet firstObject]; // expected-warning{{from 'Widget *'}}
ip = [untypedMutSet firstObject]; // expected-warning{{from 'id'}}
ip = [mutStringArraySet firstObject]; // expected-warning{{from 'NSArray<NSString *> *'}}
ip = [set firstObject]; // expected-warning{{from 'id'}}
ip = [mutSet firstObject]; // expected-warning{{from 'id'}}
ip = [mutArraySet firstObject]; // expected-warning{{from 'id'}}
ip = [block firstObject]; // expected-warning{{from 'id'}}
ip = [stringSet findObject:@"blah"]; // expected-warning{{from 'NSString *'}}
// Class messages.
ip = [NSSet<NSString *> alloc]; // expected-warning{{from 'NSSet<NSString *> *'}}
ip = [NSSet alloc]; // expected-warning{{from 'NSSet *'}}
ip = [MutableSetOfArrays<NSString *> alloc]; // expected-warning{{from 'MutableSetOfArrays<NSString *> *'}}
ip = [MutableSetOfArrays alloc]; // expected-warning{{from 'MutableSetOfArrays *'}}
ip = [NSArray<NSString *> array]; // expected-warning{{from 'NSArray<NSString *> *'}}
ip = [NSArray<NSString *><NSCopying> array]; // expected-warning{{from 'NSArray<NSString *> *'}}
ip = [[NSMutableArray<NSString *> alloc] init]; // expected-warning{{from 'NSMutableArray<NSString *> *'}}
[[NSMutableArray alloc] initWithArray: stringArray]; // okay
[[NSMutableArray<NSString *> alloc] initWithArray: stringArray]; // okay
[[NSMutableArray<NSNumber *> alloc] initWithArray: stringArray]; // expected-warning{{sending 'NSArray<NSString *> *' to parameter of type 'NSArray<NSNumber *> *'}}
ip = [[[NSViewController alloc] init] view]; // expected-warning{{from '__kindof NSView *'}}
[[[[NSViewController alloc] init] view] toggle];
NSMutableString *mutStr = kindofStringArray[0];
NSNumber *number = kindofStringArray[0]; // expected-warning{{of type '__kindof NSString *'}}
}
void test_message_send_param(
NSMutableSet<NSString *> *mutStringSet,
WidgetSet *widgetSet,
UntypedMutableSet *untypedMutSet,
MutableSetOfArrays<NSString *> *mutStringArraySet,
NSMutableSet *mutSet,
MutableSetOfArrays *mutArraySet,
TypedefTypeParam<NSString *> *typedefTypeParam,
void (^block)(void)) {
Window *window;
[mutStringSet addObject: window]; // expected-warning{{parameter of type 'NSString *'}}
[widgetSet addObject: window]; // expected-warning{{parameter of type 'Widget *'}}
[untypedMutSet addObject: window]; // expected-warning{{parameter of incompatible type 'id<NSCopying>'}}
[mutStringArraySet addObject: window]; // expected-warning{{parameter of type 'NSArray<NSString *> *'}}
[mutSet addObject: window]; // expected-warning{{parameter of incompatible type 'id<NSCopying>'}}
[mutArraySet addObject: window]; // expected-warning{{parameter of incompatible type 'id<NSCopying>'}}
[typedefTypeParam test: window]; // expected-warning{{parameter of type 'NSString *'}}
[block addObject: window]; // expected-warning{{parameter of incompatible type 'id<NSCopying>'}}
}
// --------------------------------------------------------------------------
// Property accesses.
// --------------------------------------------------------------------------
void test_property_read(
NSSet<NSString *> *stringSet,
NSMutableSet<NSString *> *mutStringSet,
WidgetSet *widgetSet,
UntypedMutableSet *untypedMutSet,
MutableSetOfArrays<NSString *> *mutStringArraySet,
NSSet *set,
NSMutableSet *mutSet,
MutableSetOfArrays *mutArraySet,
NSMutableDictionary *mutDict) {
int *ip;
ip = stringSet.allObjects; // expected-warning{{from 'NSArray<NSString *> *'}}
ip = mutStringSet.allObjects; // expected-warning{{from 'NSArray<NSString *> *'}}
ip = widgetSet.allObjects; // expected-warning{{from 'NSArray<Widget *> *'}}
ip = untypedMutSet.allObjects; // expected-warning{{from 'NSArray *'}}
ip = mutStringArraySet.allObjects; // expected-warning{{from 'NSArray<NSArray<NSString *> *> *'}}
ip = set.allObjects; // expected-warning{{from 'NSArray *'}}
ip = mutSet.allObjects; // expected-warning{{from 'NSArray *'}}
ip = mutArraySet.allObjects; // expected-warning{{from 'NSArray *'}}
ip = mutDict.someRandomKey; // expected-warning{{from '__kindof id<NSCopying>'}}
ip = [[NSViewController alloc] init].view; // expected-warning{{from '__kindof NSView *'}}
}
void test_property_write(
NSMutableSet<NSString *> *mutStringSet,
WidgetSet *widgetSet,
UntypedMutableSet *untypedMutSet,
MutableSetOfArrays<NSString *> *mutStringArraySet,
NSMutableSet *mutSet,
MutableSetOfArrays *mutArraySet,
NSMutableDictionary *mutDict) {
int *ip;
mutStringSet.allObjects = ip; // expected-warning{{to 'NSArray<NSString *> *'}}
widgetSet.allObjects = ip; // expected-warning{{to 'NSArray<Widget *> *'}}
untypedMutSet.allObjects = ip; // expected-warning{{to 'NSArray *'}}
mutStringArraySet.allObjects = ip; // expected-warning{{to 'NSArray<NSArray<NSString *> *> *'}}
mutSet.allObjects = ip; // expected-warning{{to 'NSArray *'}}
mutArraySet.allObjects = ip; // expected-warning{{to 'NSArray *'}}
mutDict.someRandomKey = ip; // expected-warning{{to 'id<NSCopying>'}}
}
// --------------------------------------------------------------------------
// Subscripting
// --------------------------------------------------------------------------
void test_subscripting(
NSArray<NSString *> *stringArray,
NSMutableArray<NSString *> *mutStringArray,
NSArray *array,
NSMutableArray *mutArray,
NSDictionary<NSString *, Widget *> *stringWidgetDict,
NSMutableDictionary<NSString *, Widget *> *mutStringWidgetDict,
NSDictionary *dict,
NSMutableDictionary *mutDict) {
int *ip;
NSString *string;
Widget *widget;
Window *window;
ip = stringArray[0]; // expected-warning{{from 'NSString *'}}
ip = mutStringArray[0]; // expected-warning{{from 'NSString *'}}
mutStringArray[0] = ip; // expected-warning{{parameter of type 'NSString *'}}
ip = array[0]; // expected-warning{{from 'id'}}
ip = mutArray[0]; // expected-warning{{from 'id'}}
mutArray[0] = ip; // expected-warning{{parameter of type 'id'}}
ip = stringWidgetDict[string]; // expected-warning{{from 'Widget *'}}
widget = stringWidgetDict[widget]; // expected-warning{{to parameter of type 'NSString *'}}
ip = mutStringWidgetDict[string]; // expected-warning{{from 'Widget *'}}
widget = mutStringWidgetDict[widget]; // expected-warning{{to parameter of type 'NSString *'}}
mutStringWidgetDict[string] = ip; // expected-warning{{to parameter of type 'Widget *'}}
mutStringWidgetDict[widget] = widget; // expected-warning{{to parameter of type 'NSString *'}}
ip = dict[string]; // expected-warning{{from 'id'}}
ip = mutDict[string]; // expected-warning{{from 'id'}}
mutDict[string] = ip; // expected-warning{{to parameter of type 'id'}}
widget = mutDict[window];
mutDict[window] = widget; // expected-warning{{parameter of incompatible type 'id<NSCopying>'}}
}
// --------------------------------------------------------------------------
// Instance variable access.
// --------------------------------------------------------------------------
void test_instance_variable(NSArray<NSString *> *stringArray,
NSArray *array) {
int *ip;
ip = stringArray->data; // expected-warning{{from 'NSString **'}}
ip = array->data; // expected-warning{{from 'id *'}}
}
@implementation WindowArray
- (void)testInstanceVariable {
int *ip;
ip = data; // expected-warning{{from 'Window **'}}
}
@end
// --------------------------------------------------------------------------
// Implicit conversions.
// --------------------------------------------------------------------------
void test_implicit_conversions(NSArray<NSString *> *stringArray,
NSArray<NSNumber *> *numberArray,
NSMutableArray<NSString *> *mutStringArray,
NSArray *array,
NSMutableArray *mutArray) {
// Specialized -> unspecialized (same level)
array = stringArray;
// Unspecialized -> specialized (same level)
stringArray = array;
// Specialized -> specialized failure (same level).
stringArray = numberArray; // expected-warning{{incompatible pointer types assigning to 'NSArray<NSString *> *' from 'NSArray<NSNumber *> *'}}
// Specialized -> specialized (different levels).
stringArray = mutStringArray;
// Specialized -> specialized failure (different levels).
numberArray = mutStringArray; // expected-warning{{incompatible pointer types assigning to 'NSArray<NSNumber *> *' from 'NSMutableArray<NSString *> *'}}
// Unspecialized -> specialized (different levels).
stringArray = mutArray;
// Specialized -> unspecialized (different levels).
array = mutStringArray;
}
@interface NSCovariant1<__covariant T>
@end
@interface NSContravariant1<__contravariant T>
@end
void test_variance(NSCovariant1<NSString *> *covariant1,
NSCovariant1<NSMutableString *> *covariant2,
NSCovariant1<NSString *(^)(void)> *covariant3,
NSCovariant1<NSMutableString *(^)(void)> *covariant4,
NSCovariant1<id> *covariant5,
NSCovariant1<id<NSCopying>> *covariant6,
NSContravariant1<NSString *> *contravariant1,
NSContravariant1<NSMutableString *> *contravariant2) {
covariant1 = covariant2; // okay
covariant2 = covariant1; // expected-warning{{incompatible pointer types assigning to 'NSCovariant1<NSMutableString *> *' from 'NSCovariant1<NSString *> *'}}
covariant3 = covariant4; // okay
covariant4 = covariant3; // expected-warning{{incompatible pointer types assigning to 'NSCovariant1<NSMutableString *(^)(void)> *' from 'NSCovariant1<NSString *(^)(void)> *'}}
covariant5 = covariant1; // okay
covariant1 = covariant5; // okay: id is promiscuous
covariant5 = covariant3; // okay
covariant3 = covariant5; // okay
contravariant1 = contravariant2; // expected-warning{{incompatible pointer types assigning to 'NSContravariant1<NSString *> *' from 'NSContravariant1<NSMutableString *> *'}}
contravariant2 = contravariant1; // okay
}
// --------------------------------------------------------------------------
// Ternary operator
// --------------------------------------------------------------------------
void test_ternary_operator(NSArray<NSString *> *stringArray,
NSArray<NSNumber *> *numberArray,
NSMutableArray<NSString *> *mutStringArray,
NSStringArray *stringArray2,
NSArray *array,
NSMutableArray *mutArray,
int cond) {
int *ip;
id object;
ip = cond ? stringArray : mutStringArray; // expected-warning{{from 'NSArray<NSString *> *'}}
ip = cond ? mutStringArray : stringArray; // expected-warning{{from 'NSArray<NSString *> *'}}
ip = cond ? stringArray2 : mutStringArray; // expected-warning{{from 'NSArray<NSString *> *'}}
ip = cond ? mutStringArray : stringArray2; // expected-warning{{from 'NSArray<NSString *> *'}}
ip = cond ? stringArray : mutArray; // expected-warning{{from 'NSArray *'}}
ip = cond ? stringArray2 : mutArray; // expected-warning{{from 'NSArray *'}}
ip = cond ? mutArray : stringArray; // expected-warning{{from 'NSArray *'}}
ip = cond ? mutArray : stringArray2; // expected-warning{{from 'NSArray *'}}
object = cond ? stringArray : numberArray; // expected-warning{{incompatible operand types ('NSArray<NSString *> *' and 'NSArray<NSNumber *> *')}}
}
// --------------------------------------------------------------------------
// super
// --------------------------------------------------------------------------
@implementation NSStringArray
- (void)useSuperMethod {
int *ip;
ip = super.lastObject; // expected-warning{{from 'NSString *'}}
super.lastObject = ip; // expected-warning{{to 'NSString *'}}
ip = [super objectAtIndexedSubscript:0]; // expected-warning{{from 'NSString *'}}
}
+ (void)useSuperMethod {
int *ip;
ip = super.array; // expected-warning{{from 'NSArray<NSString *> *'}}
super.array = ip; // expected-warning{{to 'NSArray<NSString *> *'}}
ip = [super array]; // expected-warning{{from 'NSArray<NSString *> *'}}
}
@end
// --------------------------------------------------------------------------
// warning about likely protocol/class name typos.
// --------------------------------------------------------------------------
typedef NSArray<NSObject> ArrayOfNSObjectWarning; // expected-warning{{parameterized class 'NSArray' already conforms to the protocols listed; did you forget a '*'?}}
@interface MyMutableDictionary<KeyType, ObjectType> : NSObject
- (void)setObject:(ObjectType)obj forKeyedSubscript:(KeyType <NSCopying>)key; // expected-note{{passing argument to parameter 'obj' here}} \
// expected-note{{passing argument to parameter 'key' here}}
@end
void bar(MyMutableDictionary<NSString *, NSString *> *stringsByString,
NSNumber *n1, NSNumber *n2) {
// We warn here when the key types do not match.
stringsByString[n1] = n2; // expected-warning{{incompatible pointer types sending 'NSNumber *' to parameter of type 'NSString *'}} \
// expected-warning{{incompatible pointer types sending 'NSNumber *' to parameter of type 'NSString<NSCopying> *'}}
}
@interface MyTest<K, V> : NSObject <NSCopying>
- (V)test:(K)key;
- (V)test2:(K)key; // expected-note{{previous definition is here}}
- (void)mapUsingBlock:(id (^)(V))block;
- (void)mapUsingBlock2:(id (^)(V))block; // expected-note{{previous definition is here}}
@end
@implementation MyTest
- (id)test:(id)key {
return key;
}
- (int)test2:(id)key{ // expected-warning{{conflicting return type in implementation}}
return 0;
}
- (void)mapUsingBlock:(id (^)(id))block {
}
- (void)mapUsingBlock2:(id)block { // expected-warning{{conflicting parameter types in implementation}}
}
@end
// --------------------------------------------------------------------------
// Use a type parameter as a type argument.
// --------------------------------------------------------------------------
// Type bounds in a category/extension are omitted.
@interface ParameterizedContainer<T : id<NSCopying>>
- (ParameterizedContainer<T> *)inInterface;
@end
@interface ParameterizedContainer<T> (Cat)
- (ParameterizedContainer<T> *)inCategory;
@end
@interface ParameterizedContainer<U> ()
- (ParameterizedContainer<U> *)inExtension;
@end
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