forked from OSchip/llvm-project
131 lines
6.2 KiB
C
131 lines
6.2 KiB
C
// RUN: %clang_cc1 -fsyntax-only -fblocks -Wnullable-to-nonnull-conversion -Wno-nullability-declspec %s -verify
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#if __has_feature(nullability)
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#else
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# error nullability feature should be defined
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#endif
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typedef int * int_ptr;
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// Parse nullability type specifiers.
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// This note requires C11.
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#if __STDC_VERSION__ > 199901L
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// expected-note@+2{{'_Nonnull' specified here}}
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#endif
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typedef int * _Nonnull nonnull_int_ptr;
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typedef int * _Nullable nullable_int_ptr;
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typedef int * _Null_unspecified null_unspecified_int_ptr;
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// Redundant nullability type specifiers.
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typedef int * _Nonnull _Nonnull redundant_1; // expected-warning{{duplicate nullability specifier '_Nonnull'}}
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// Conflicting nullability type specifiers.
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typedef int * _Nonnull _Nullable conflicting_1; // expected-error{{nullability specifier '_Nonnull' conflicts with existing specifier '_Nullable'}}
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typedef int * _Null_unspecified _Nonnull conflicting_2; // expected-error{{nullability specifier '_Null_unspecified' conflicts with existing specifier '_Nonnull'}}
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// Redundant nullability specifiers via a typedef are okay.
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typedef nonnull_int_ptr _Nonnull redundant_okay_1;
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// Conflicting nullability specifiers via a typedef are not.
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// Some of these errors require C11.
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#if __STDC_VERSION__ > 199901L
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typedef nonnull_int_ptr _Nullable conflicting_2; // expected-error{{nullability specifier '_Nullable' conflicts with existing specifier '_Nonnull'}}
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#endif
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typedef nonnull_int_ptr nonnull_int_ptr_typedef;
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#if __STDC_VERSION__ > 199901L
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typedef nonnull_int_ptr_typedef _Nullable conflicting_2; // expected-error{{nullability specifier '_Nullable' conflicts with existing specifier '_Nonnull'}}
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#endif
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typedef nonnull_int_ptr_typedef nonnull_int_ptr_typedef_typedef;
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typedef nonnull_int_ptr_typedef_typedef _Null_unspecified conflicting_3; // expected-error{{nullability specifier '_Null_unspecified' conflicts with existing specifier '_Nonnull'}}
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// Nullability applies to all pointer types.
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typedef int (* _Nonnull function_pointer_type_1)(int, int);
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typedef int (^ _Nonnull block_type_1)(int, int);
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// Nullability must be on a pointer type.
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typedef int _Nonnull int_type_1; // expected-error{{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int'}}
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// Nullability can move out to a pointer/block pointer declarator
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// (with a suppressed warning).
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typedef _Nonnull int * nonnull_int_ptr_2;
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typedef int _Nullable * nullable_int_ptr_2;
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typedef _Nonnull int (* function_pointer_type_2)(int, int);
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typedef _Nonnull int (^ block_type_2)(int, int);
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typedef _Nonnull int * * _Nullable nonnull_int_ptr_ptr_1;
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typedef _Nonnull int *(^ block_type_3)(int, int);
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typedef _Nonnull int *(* function_pointer_type_3)(int, int);
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typedef _Nonnull int_ptr (^ block_type_4)(int, int);
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typedef _Nonnull int_ptr (* function_pointer_type_4)(int, int);
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typedef void (* function_pointer_type_5)(int_ptr _Nonnull);
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void acceptFunctionPtr(_Nonnull int *(*)(void));
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void acceptBlockPtr(_Nonnull int *(^)(void));
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void testBlockFunctionPtrNullability() {
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float *fp;
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fp = (function_pointer_type_3)0; // expected-warning{{from 'function_pointer_type_3' (aka 'int * _Nonnull (*)(int, int)')}}
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fp = (block_type_3)0; // expected-error{{from incompatible type 'block_type_3' (aka 'int * _Nonnull (^)(int, int)')}}
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fp = (function_pointer_type_4)0; // expected-warning{{from 'function_pointer_type_4' (aka 'int * _Nonnull (*)(int, int)')}}
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fp = (function_pointer_type_5)0; // expected-warning{{from 'function_pointer_type_5' (aka 'void (*)(int * _Nonnull)')}}
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fp = (block_type_4)0; // expected-error{{from incompatible type 'block_type_4' (aka 'int_ptr _Nonnull (^)(int, int)')}}
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acceptFunctionPtr(0); // no-warning
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acceptBlockPtr(0); // no-warning
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}
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// Moving nullability where it creates a conflict.
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typedef _Nonnull int * _Nullable * conflict_int_ptr_ptr_2; // expected-error{{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int'}}
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// Nullability is not part of the canonical type.
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typedef int * _Nonnull ambiguous_int_ptr;
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// Redefining a typedef is a C11 feature.
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#if __STDC_VERSION__ > 199901L
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typedef int * ambiguous_int_ptr;
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typedef int * _Nullable ambiguous_int_ptr;
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#endif
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// Printing of nullability.
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float f;
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int * _Nonnull ip_1 = &f; // expected-warning{{incompatible pointer types initializing 'int * _Nonnull' with an expression of type 'float *'}}
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// Check printing of nullability specifiers.
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void printing_nullability(void) {
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int * _Nonnull iptr;
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float *fptr = iptr; // expected-warning{{incompatible pointer types initializing 'float *' with an expression of type 'int * _Nonnull'}}
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int * * _Nonnull iptrptr;
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float **fptrptr = iptrptr; // expected-warning{{incompatible pointer types initializing 'float **' with an expression of type 'int ** _Nonnull'}}
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int * _Nullable * _Nonnull iptrptr2;
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float * *fptrptr2 = iptrptr2; // expected-warning{{incompatible pointer types initializing 'float **' with an expression of type 'int * _Nullable * _Nonnull'}}
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}
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// Check passing null to a _Nonnull argument.
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void accepts_nonnull_1(_Nonnull int *ptr);
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void (*accepts_nonnull_2)(_Nonnull int *ptr);
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void (^accepts_nonnull_3)(_Nonnull int *ptr);
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void test_accepts_nonnull_null_pointer_literal() {
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accepts_nonnull_1(0); // expected-warning{{null passed to a callee that requires a non-null argument}}
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accepts_nonnull_2(0); // expected-warning{{null passed to a callee that requires a non-null argument}}
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accepts_nonnull_3(0); // expected-warning{{null passed to a callee that requires a non-null argument}}
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}
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// Check returning nil from a _Nonnull-returning function.
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_Nonnull int *returns_int_ptr(int x) {
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if (x) {
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return 0; // expected-warning{{null returned from function that requires a non-null return value}}
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}
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return (_Nonnull int *)0;
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}
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// Check nullable-to-nonnull conversions.
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void nullable_to_nonnull(_Nullable int *ptr) {
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int *a = ptr; // okay
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_Nonnull int *b = ptr; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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b = ptr; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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accepts_nonnull_1(ptr); // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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}
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