1 files changed, 232 insertions, 0 deletions
diff --git a/test/SemaObjC/nullability.m b/test/SemaObjC/nullability.m
new file mode 100644
index 000000000000..ca8c2fcd321e
--- /dev/null
+++ b/test/SemaObjC/nullability.m
@@ -0,0 +1,232 @@
+// RUN: %clang_cc1 -fsyntax-only -fblocks -Woverriding-method-mismatch -Wno-nullability-declspec %s -verify
+
+__attribute__((objc_root_class))
+@interface NSFoo
+- (void)methodTakingIntPtr:(__nonnull int *)ptr;
+- (__nonnull int *)methodReturningIntPtr;
+@end
+
+// Nullability applies to all pointer types.
+typedef NSFoo * __nonnull nonnull_NSFoo_ptr;
+typedef id __nonnull nonnull_id;
+typedef SEL __nonnull nonnull_SEL;
+
+// Nullability can move into Objective-C pointer types.
+typedef __nonnull NSFoo * nonnull_NSFoo_ptr_2;
+
+// Conflicts from nullability moving into Objective-C pointer type.
+typedef __nonnull NSFoo * __nullable conflict_NSFoo_ptr_2; // expected-error{{'__nonnull' cannot be applied to non-pointer type 'NSFoo'}}
+
+void testBlocksPrinting(NSFoo * __nullable (^bp)(int)) {
+  int *ip = bp; // expected-error{{'NSFoo * __nullable (^)(int)'}}
+}
+
+// Check returning nil from a __nonnull-returning method.
+@implementation NSFoo
+- (void)methodTakingIntPtr:(__nonnull int *)ptr { }
+- (__nonnull int *)methodReturningIntPtr {
+  return 0; // no warning
+}
+@end
+
+// Context-sensitive keywords and property attributes for nullability.
+__attribute__((objc_root_class))
+@interface NSBar
+- (nonnull NSFoo *)methodWithFoo:(nonnull NSFoo *)foo;
+
+- (nonnull NSFoo **)invalidMethod1; // expected-error{{nullability keyword 'nonnull' cannot be applied to multi-level pointer type 'NSFoo **'}}
+// expected-note@-1{{use nullability type specifier '__nonnull' to affect the innermost pointer type of 'NSFoo **'}}
+- (nonnull NSFoo * __nullable)conflictingMethod1; // expected-error{{nullability specifier '__nullable' conflicts with existing specifier '__nonnull'}}
+- (nonnull NSFoo * __nonnull)redundantMethod1; // expected-warning{{duplicate nullability specifier '__nonnull'}}
+
+@property(nonnull,retain) NSFoo *property1;
+@property(nullable,assign) NSFoo ** invalidProperty1; // expected-error{{nullability keyword 'nullable' cannot be applied to multi-level pointer type 'NSFoo **'}}
+// expected-note@-1{{use nullability type specifier '__nullable' to affect the innermost pointer type of 'NSFoo **'}}
+@property(null_unspecified,retain) NSFoo * __nullable conflictingProperty1; // expected-error{{nullability specifier '__nullable' conflicts with existing specifier '__null_unspecified'}}
+@property(retain,nonnull) NSFoo * __nonnull redundantProperty1; // expected-warning{{duplicate nullability specifier '__nonnull'}}
+
+@property(null_unspecified,retain,nullable) NSFoo *conflictingProperty3; // expected-error{{nullability specifier 'nullable' conflicts with existing specifier 'null_unspecified'}}
+@property(nullable,retain,nullable) NSFoo *redundantProperty3; // expected-warning{{duplicate nullability specifier 'nullable'}}
+@end
+
+@interface NSBar ()
+@property(nonnull,retain) NSFoo *property2;
+@property(nullable,assign) NSFoo ** invalidProperty2; // expected-error{{nullability keyword 'nullable' cannot be applied to multi-level pointer type 'NSFoo **'}}
+// expected-note@-1{{use nullability type specifier '__nullable' to affect the innermost pointer type of 'NSFoo **'}}
+@property(null_unspecified,retain) NSFoo * __nullable conflictingProperty2; // expected-error{{nullability specifier '__nullable' conflicts with existing specifier '__null_unspecified'}}
+@property(retain,nonnull) NSFoo * __nonnull redundantProperty2; // expected-warning{{duplicate nullability specifier '__nonnull'}}
+@end
+
+void test_accepts_nonnull_null_pointer_literal(NSFoo *foo, __nonnull NSBar *bar) {
+  [foo methodTakingIntPtr: 0]; // expected-warning{{null passed to a callee that requires a non-null argument}}
+  [bar methodWithFoo: 0]; // expected-warning{{null passed to a callee that requires a non-null argument}}
+  bar.property1 = 0; // expected-warning{{null passed to a callee that requires a non-null argument}}
+  bar.property2 = 0; // expected-warning{{null passed to a callee that requires a non-null argument}}
+  [bar setProperty1: 0]; // expected-warning{{null passed to a callee that requires a non-null argument}}
+  [bar setProperty2: 0]; // expected-warning{{null passed to a callee that requires a non-null argument}}
+  int *ptr = bar.property1; // expected-warning{{incompatible pointer types initializing 'int *' with an expression of type 'NSFoo * __nonnull'}}
+}
+
+// Check returning nil from a nonnull-returning method.
+@implementation NSBar
+- (nonnull NSFoo *)methodWithFoo:(nonnull NSFoo *)foo {
+  return 0; // no warning
+}
+
+- (NSFoo **)invalidMethod1 { 
+  return 0; 
+}
+
+- (NSFoo *)conflictingMethod1 { 
+  return 0; // no warning
+}
+- (NSFoo *)redundantMethod1 {
+  int *ip = 0;
+  return ip; // expected-warning{{result type 'NSFoo * __nonnull'}}
+}
+@end
+
+__attribute__((objc_root_class))
+@interface NSMerge
+- (nonnull NSFoo *)methodA:(nonnull NSFoo*)foo;
+- (nonnull NSFoo *)methodB:(nonnull NSFoo*)foo;
+- (NSFoo *)methodC:(NSFoo*)foo;
+@end
+
+@implementation NSMerge
+- (NSFoo *)methodA:(NSFoo*)foo {
+  int *ptr = foo; // expected-warning{{incompatible pointer types initializing 'int *' with an expression of type 'NSFoo * __nonnull'}}
+  return ptr; // expected-warning{{result type 'NSFoo * __nonnull'}}
+}
+
+- (nullable NSFoo *)methodB:(null_unspecified NSFoo*)foo { // expected-error{{nullability specifier 'nullable' conflicts with existing specifier 'nonnull'}} \
+  // expected-error{{nullability specifier 'null_unspecified' conflicts with existing specifier 'nonnull'}}
+  return 0;
+}
+
+- (nonnull NSFoo *)methodC:(nullable NSFoo*)foo {
+  int *ip = 0;
+  return ip; // expected-warning{{result type 'NSFoo * __nonnull'}}
+}
+@end
+
+// Checking merging of nullability when sending a message.
+@interface NSMergeReceiver
+- (id)returnsNone;
+- (nonnull id)returnsNonNull;
+- (nullable id)returnsNullable;
+- (null_unspecified id)returnsNullUnspecified;
+@end
+
+void test_receiver_merge(NSMergeReceiver *none,
+                         __nonnull NSMergeReceiver *nonnull,
+                         __nullable NSMergeReceiver *nullable,
+                         __null_unspecified NSMergeReceiver *null_unspecified) {
+  int *ptr;
+
+  ptr = [nullable returnsNullable]; // expected-warning{{'id __nullable'}}
+  ptr = [nullable returnsNullUnspecified]; // expected-warning{{'id __nullable'}}
+  ptr = [nullable returnsNonNull]; // expected-warning{{'id __nullable'}}
+  ptr = [nullable returnsNone]; // expected-warning{{'id __nullable'}}
+
+  ptr = [null_unspecified returnsNullable]; // expected-warning{{'id __nullable'}}
+  ptr = [null_unspecified returnsNullUnspecified]; // expected-warning{{'id __null_unspecified'}}
+  ptr = [null_unspecified returnsNonNull]; // expected-warning{{'id __null_unspecified'}}
+  ptr = [null_unspecified returnsNone]; // expected-warning{{'id'}}
+
+  ptr = [nonnull returnsNullable]; // expected-warning{{'id __nullable'}}
+  ptr = [nonnull returnsNullUnspecified]; // expected-warning{{'id __null_unspecified'}}
+  ptr = [nonnull returnsNonNull]; // expected-warning{{'id __nonnull'}}
+  ptr = [nonnull returnsNone]; // expected-warning{{'id'}}
+
+  ptr = [none returnsNullable]; // expected-warning{{'id __nullable'}}
+  ptr = [none returnsNullUnspecified]; // expected-warning{{'id'}}
+  ptr = [none returnsNonNull]; // expected-warning{{'id'}}
+  ptr = [none returnsNone]; // expected-warning{{'id'}}
+  
+}
+
+// instancetype
+@protocol Initializable
+- (instancetype)initWithBlah:(id)blah;
+@end
+
+__attribute__((objc_root_class))
+@interface InitializableClass <Initializable>
+- (nonnull instancetype)initWithBlah:(nonnull id)blah;
+- (nullable instancetype)returnMe;
++ (nullable instancetype)returnInstanceOfMe;
+
+- (nonnull instancetype __nullable)initWithBlah2:(nonnull id)blah; // expected-error {{nullability specifier '__nullable' conflicts with existing specifier '__nonnull'}}
+- (instancetype __nullable)returnMe2;
++ (__nonnull instancetype)returnInstanceOfMe2;
+@end
+
+void test_instancetype(InitializableClass * __nonnull ic, id __nonnull object) {
+  int *ip = [ic returnMe]; // expected-warning{{incompatible pointer types initializing 'int *' with an expression of type 'InitializableClass * __nullable'}}
+  ip = [InitializableClass returnMe]; // expected-warning{{incompatible pointer types assigning to 'int *' from 'id __nullable'}}
+  ip = [InitializableClass returnInstanceOfMe]; // expected-warning{{incompatible pointer types assigning to 'int *' from 'InitializableClass * __nullable'}}
+  ip = [object returnMe]; // expected-warning{{incompatible pointer types assigning to 'int *' from 'id __nullable'}}
+
+  ip = [ic returnMe2]; // expected-warning{{incompatible pointer types assigning to 'int *' from 'InitializableClass * __nullable'}}
+  ip = [InitializableClass returnInstanceOfMe2]; // expected-warning{{incompatible pointer types assigning to 'int *' from 'InitializableClass * __nonnull'}}
+}
+
+// Check null_resettable getters/setters.
+__attribute__((objc_root_class))
+@interface NSResettable
+@property(null_resettable,retain) NSResettable *resettable1; // expected-note{{passing argument to parameter 'resettable1' here}}
+@property(null_resettable,retain,nonatomic) NSResettable *resettable2;
+@property(null_resettable,retain,nonatomic) NSResettable *resettable3;
+@property(null_resettable,retain,nonatomic) NSResettable *resettable4;
+@property(null_resettable,retain,nonatomic) NSResettable *resettable5;
+@property(null_resettable,retain,nonatomic) NSResettable *resettable6;
+@end
+
+void test_null_resettable(NSResettable *r, int *ip) {
+  [r setResettable1:ip]; // expected-warning{{incompatible pointer types sending 'int *' to parameter of type 'NSResettable * __nullable'}}
+  r.resettable1 = ip; // expected-warning{{incompatible pointer types assigning to 'NSResettable * __nullable' from 'int *'}}
+}
+
+@implementation NSResettable // expected-warning{{synthesized setter 'setResettable4:' for null_resettable property 'resettable4' does not handle nil}}
+- (NSResettable *)resettable1 {
+  int *ip = 0;
+  return ip; // expected-warning{{result type 'NSResettable * __nonnull'}}
+}
+
+- (void)setResettable1:(NSResettable *)param {
+}
+
+@synthesize resettable2; // no warning; not synthesized
+@synthesize resettable3; // expected-warning{{synthesized setter 'setResettable3:' for null_resettable property 'resettable3' does not handle nil}}
+
+- (void)setResettable2:(NSResettable *)param {
+}
+
+@dynamic resettable5;
+
+- (NSResettable *)resettable6 {
+  return 0; // no warning
+}
+@end
+
+// rdar://problem/19814852
+@interface MultiProp
+@property (nullable, copy) id a, b, c;
+@property (nullable, copy) MultiProp *d, *(^e)(int);
+@end
+
+void testMultiProp(MultiProp *foo) {
+  int *ip;
+  ip = foo.a; // expected-warning{{from 'id __nullable'}}
+  ip = foo.d; // expected-warning{{from 'MultiProp * __nullable'}}
+  ip = foo.e; // expected-error{{incompatible type 'MultiProp *(^ __nullable)(int)'}}
+}
+
+void testBlockLiterals() {
+  (void)(^id(void) { return 0; });
+  (void)(^id __nullable (void) { return 0; });
+  (void)(^ __nullable id(void) { return 0; });
+
+  int *x = (^ __nullable id(void) { return 0; })(); // expected-warning{{incompatible pointer types initializing 'int *' with an expression of type 'id __nullable'}}
+}