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// RUN: %clang_cc1 -fsyntax-only -fblocks -Wnullable-to-nonnull-conversion -Wno-nullability-declspec %s -verify
#if __has_feature(nullability)
#else
# error nullability feature should be defined
#endif
typedef int * int_ptr;
// Parse nullability type specifiers.
typedef int * __nonnull nonnull_int_ptr; // expected-note{{'__nonnull' specified here}}
typedef int * __nullable nullable_int_ptr;
typedef int * __null_unspecified null_unspecified_int_ptr;
// Redundant nullability type specifiers.
typedef int * __nonnull __nonnull redundant_1; // expected-warning{{duplicate nullability specifier '__nonnull'}}
// Conflicting nullability type specifiers.
typedef int * __nonnull __nullable conflicting_1; // expected-error{{nullability specifier '__nonnull' conflicts with existing specifier '__nullable'}}
typedef int * __null_unspecified __nonnull conflicting_2; // expected-error{{nullability specifier '__null_unspecified' conflicts with existing specifier '__nonnull'}}
// Redundant nullability specifiers via a typedef are okay.
typedef nonnull_int_ptr __nonnull redundant_okay_1;
// Conflicting nullability specifiers via a typedef are not.
typedef nonnull_int_ptr __nullable conflicting_2; // expected-error{{nullability specifier '__nullable' conflicts with existing specifier '__nonnull'}}
typedef nonnull_int_ptr nonnull_int_ptr_typedef;
typedef nonnull_int_ptr_typedef __nullable conflicting_2; // expected-error{{nullability specifier '__nullable' conflicts with existing specifier '__nonnull'}}
typedef nonnull_int_ptr_typedef nonnull_int_ptr_typedef_typedef;
typedef nonnull_int_ptr_typedef_typedef __null_unspecified conflicting_3; // expected-error{{nullability specifier '__null_unspecified' conflicts with existing specifier '__nonnull'}}
// Nullability applies to all pointer types.
typedef int (* __nonnull function_pointer_type_1)(int, int);
typedef int (^ __nonnull block_type_1)(int, int);
// Nullability must be on a pointer type.
typedef int __nonnull int_type_1; // expected-error{{nullability specifier '__nonnull' cannot be applied to non-pointer type 'int'}}
// Nullability can move out to a pointer/block pointer declarator
// (with a suppressed warning).
typedef __nonnull int * nonnull_int_ptr_2;
typedef int __nullable * nullable_int_ptr_2;
typedef __nonnull int (* function_pointer_type_2)(int, int);
typedef __nonnull int (^ block_type_2)(int, int);
typedef __nonnull int * * __nullable nonnull_int_ptr_ptr_1;
typedef __nonnull int *(^ block_type_3)(int, int);
typedef __nonnull int *(* function_pointer_type_3)(int, int);
typedef __nonnull int_ptr (^ block_type_4)(int, int);
typedef __nonnull int_ptr (* function_pointer_type_4)(int, int);
void acceptFunctionPtr(__nonnull int *(*)(void));
void acceptBlockPtr(__nonnull int *(^)(void));
void testBlockFunctionPtrNullability() {
float *fp;
fp = (function_pointer_type_3)0; // expected-warning{{from 'function_pointer_type_3' (aka 'int * __nonnull (*)(int, int)')}}
fp = (block_type_3)0; // expected-error{{from incompatible type 'block_type_3' (aka 'int * __nonnull (^)(int, int)')}}
fp = (function_pointer_type_4)0; // expected-warning{{from 'function_pointer_type_4' (aka 'int_ptr __nonnull (*)(int, int)')}}
fp = (block_type_4)0; // expected-error{{from incompatible type 'block_type_4' (aka 'int_ptr __nonnull (^)(int, int)')}}
acceptFunctionPtr(0); // no-warning
acceptBlockPtr(0); // no-warning
}
// Moving nullability where it creates a conflict.
typedef __nonnull int * __nullable * conflict_int_ptr_ptr_2; // expected-error{{nullability specifier '__nonnull' cannot be applied to non-pointer type 'int'}}
// Nullability is not part of the canonical type.
typedef int * __nonnull ambiguous_int_ptr;
typedef int * ambiguous_int_ptr;
typedef int * __nullable ambiguous_int_ptr;
// Printing of nullability.
float f;
int * __nonnull ip_1 = &f; // expected-warning{{incompatible pointer types initializing 'int * __nonnull' with an expression of type 'float *'}}
// Check printing of nullability specifiers.
void printing_nullability(void) {
int * __nonnull iptr;
float *fptr = iptr; // expected-warning{{incompatible pointer types initializing 'float *' with an expression of type 'int * __nonnull'}}
int * * __nonnull iptrptr;
float **fptrptr = iptrptr; // expected-warning{{incompatible pointer types initializing 'float **' with an expression of type 'int ** __nonnull'}}
int * __nullable * __nonnull iptrptr2;
float * *fptrptr2 = iptrptr2; // expected-warning{{incompatible pointer types initializing 'float **' with an expression of type 'int * __nullable * __nonnull'}}
}
// Check passing null to a __nonnull argument.
void accepts_nonnull_1(__nonnull int *ptr);
void (*accepts_nonnull_2)(__nonnull int *ptr);
void (^accepts_nonnull_3)(__nonnull int *ptr);
void test_accepts_nonnull_null_pointer_literal() {
accepts_nonnull_1(0); // expected-warning{{null passed to a callee that requires a non-null argument}}
accepts_nonnull_2(0); // expected-warning{{null passed to a callee that requires a non-null argument}}
accepts_nonnull_3(0); // expected-warning{{null passed to a callee that requires a non-null argument}}
}
// Check returning nil from a __nonnull-returning function.
__nonnull int *returns_int_ptr(int x) {
if (x) {
return 0; // expected-warning{{null returned from function that requires a non-null return value}}
}
return (__nonnull int *)0;
}
// Check nullable-to-nonnull conversions.
void nullable_to_nonnull(__nullable int *ptr) {
int *a = ptr; // okay
__nonnull int *b = ptr; // expected-warning{{implicit conversion from nullable pointer 'int * __nullable' to non-nullable pointer type 'int * __nonnull'}}
}
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