// 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.
// This note requires C11.
#if __STDC_VERSION__ > 199901L
// expected-note@+2{{'_Nonnull' specified here}}
#endif
typedef int * _Nonnull nonnull_int_ptr;
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 '_Nullable' conflicts with existing specifier '_Nonnull'}}
typedef int * _Null_unspecified _Nonnull conflicting_2; // expected-error{{nullability specifier '_Nonnull' conflicts with existing specifier '_Null_unspecified'}}
// Redundant nullability specifiers via a typedef are okay.
typedef nonnull_int_ptr _Nonnull redundant_okay_1;
// Conflicting nullability specifiers via a typedef are not.
// Some of these errors require C11.
#if __STDC_VERSION__ > 199901L
typedef nonnull_int_ptr _Nullable conflicting_2; // expected-error{{nullability specifier '_Nullable' conflicts with existing specifier '_Nonnull'}}
#endif
typedef nonnull_int_ptr nonnull_int_ptr_typedef;
#if __STDC_VERSION__ > 199901L
typedef nonnull_int_ptr_typedef _Nullable conflicting_2; // expected-error{{nullability specifier '_Nullable' conflicts with existing specifier '_Nonnull'}}
#endif
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);
typedef void (* function_pointer_type_5)(int_ptr _Nonnull);
void acceptFunctionPtr(_Nonnull int *(*)(void));
void acceptBlockPtr(_Nonnull int *(^)(void));
void testBlockFunctionPtrNullability(void) {
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 * _Nonnull (*)(int, int)')}}
fp = (function_pointer_type_5)0; // expected-warning{{from 'function_pointer_type_5' (aka 'void (*)(int * _Nonnull)')}}
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;
// Redefining a typedef is a C11 feature.
#if __STDC_VERSION__ > 199901L
typedef int * ambiguous_int_ptr;
typedef int * _Nullable ambiguous_int_ptr;
#endif
// 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(void) {
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'}}
b = ptr; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
__auto_type _Nonnull c = ptr; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nullable _Nonnull'}}
accepts_nonnull_1(ptr); // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
}
// Check nullability of conditional expressions.
void conditional_expr(int c) {
int * _Nonnull p;
int * _Nonnull nonnullP;
int * _Nullable nullableP;
int * _Null_unspecified unspecifiedP;
int *noneP;
p = c ? nonnullP : nonnullP;
p = c ? nonnullP : nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = c ? nonnullP : unspecifiedP;
p = c ? nonnullP : noneP;
p = c ? nullableP : nonnullP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = c ? nullableP : nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = c ? nullableP : unspecifiedP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = c ? nullableP : noneP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = c ? unspecifiedP : nonnullP;
p = c ? unspecifiedP : nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = c ? unspecifiedP : unspecifiedP;
p = c ? unspecifiedP : noneP;
p = c ? noneP : nonnullP;
p = c ? noneP : nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = c ? noneP : unspecifiedP;
p = c ? noneP : noneP;
// Check that we don't remove all sugar when creating a new QualType for the
// conditional expression.
typedef int *IntP;
typedef IntP _Nonnull NonnullIntP0;
typedef NonnullIntP0 _Nonnull NonnullIntP1;
typedef IntP _Nullable NullableIntP0;
typedef NullableIntP0 _Nullable NullableIntP1;
NonnullIntP1 nonnullP2;
NullableIntP1 nullableP2;
p = c ? nonnullP2 : nonnullP2;
p = c ? nonnullP2 : nullableP2; // expected-warning{{implicit conversion from nullable pointer 'IntP _Nullable' (aka 'int *') to non-nullable pointer type 'int * _Nonnull'}}
p = c ? nullableP2 : nonnullP2; // expected-warning{{implicit conversion from nullable pointer 'IntP _Nullable' (aka 'int *') to non-nullable pointer type 'int * _Nonnull'}}
p = c ? nullableP2 : nullableP2; // expected-warning{{implicit conversion from nullable pointer 'NullableIntP1' (aka 'int *') to non-nullable pointer type 'int * _Nonnull'}}
}
// Check nullability of binary conditional expressions.
void binary_conditional_expr(void) {
int * _Nonnull p;
int * _Nonnull nonnullP;
int * _Nullable nullableP;
int * _Null_unspecified unspecifiedP;
int *noneP;
p = nonnullP ?: nonnullP;
p = nonnullP ?: nullableP;
p = nonnullP ?: unspecifiedP;
p = nonnullP ?: noneP;
p = nullableP ?: nonnullP;
p = nullableP ?: nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = nullableP ?: unspecifiedP;
p = nullableP ?: noneP;
p = unspecifiedP ?: nonnullP;
p = unspecifiedP ?: nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = unspecifiedP ?: unspecifiedP;
p = unspecifiedP ?: noneP;
p = noneP ?: nonnullP;
p = noneP ?: nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
p = noneP ?: unspecifiedP;
p = noneP ?: noneP;
}
extern int GLOBAL_LENGTH;
// Nullability can appear on arrays when the arrays are in parameter lists.
void arrays(int ints[_Nonnull],
void *ptrs[_Nullable],
void **nestedPtrs[_Nullable],
void * _Null_unspecified * _Nonnull nestedPtrs2[_Nullable],
int fixedSize[_Nonnull 2],
int staticSize[_Nonnull static 2],
int staticSize2[static _Nonnull 2],
int starSize[_Nonnull *],
int vla[_Nonnull GLOBAL_LENGTH],
void ** _Nullable reference);
void testDecayedType(void) {
int produceAnErrorMessage = arrays; // expected-error {{incompatible pointer to integer conversion initializing 'int' with an expression of type 'void (int * _Nonnull, void ** _Nullable, void *** _Nullable, void * _Null_unspecified * _Nonnull * _Nullable, int * _Nonnull, int * _Nonnull, int * _Nonnull, int * _Nonnull, int * _Nonnull, void ** _Nullable)'}}
}
int notInFunction[_Nullable 3]; // expected-error {{nullability specifier '_Nullable' cannot be applied to non-pointer type 'int[3]'}}
void nestedArrays(int x[5][_Nonnull 1]) {} // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int[1]'}}
void nestedArrays2(int x[5][_Nonnull 1][2]) {} // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int[1][2]'}}
void nestedArraysOK(int x[_Nonnull 5][1]) {} // ok
void nullabilityOnBase(_Nonnull int x[1], // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int'}}
int _Nonnull y[1]); // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int'}}
typedef int INTS[4];
typedef int BAD_INTS[_Nonnull 4]; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int[4]'}}
void typedefTest(INTS _Nonnull x,
_Nonnull INTS xx,
INTS _Nonnull y[2], // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int[4]')}}
INTS z[_Nonnull 2]);
INTS _Nonnull x; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int[4]')}}
_Nonnull INTS x; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int[4]')}}
void arraysInBlocks(void) {
typedef int INTS[4];
void (^simple)(int [_Nonnull 2]) = ^(int x[_Nonnull 2]) {};
simple(0); // expected-warning {{null passed to a callee that requires a non-null argument}}
void (^nested)(void *_Nullable x[_Nonnull 2]) = ^(void *_Nullable x[_Nonnull 2]) {};
nested(0); // expected-warning {{null passed to a callee that requires a non-null argument}}
void (^nestedBad)(int x[2][_Nonnull 2]) = // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int[2]'}}
^(int x[2][_Nonnull 2]) {}; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int[2]'}}
void (^withTypedef)(INTS _Nonnull) = ^(INTS _Nonnull x) {};
withTypedef(0); // expected-warning {{null passed to a callee that requires a non-null argument}}
void (^withTypedefBad)(INTS _Nonnull [2]) = // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int[4]')}}
^(INTS _Nonnull x[2]) {}; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int[4]')}}
}
struct _Nullable NotCplusplusClass {}; // expected-error {{'_Nullable' attribute only applies to classes}}
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