250 lines
13 KiB
C
250 lines
13 KiB
C
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// 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 '_Nullable' conflicts with existing specifier '_Nonnull'}}
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typedef int * _Null_unspecified _Nonnull conflicting_2; // expected-error{{nullability specifier '_Nonnull' conflicts with existing specifier '_Null_unspecified'}}
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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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// Check nullability of conditional expressions.
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void conditional_expr(int c) {
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int * _Nonnull p;
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int * _Nonnull nonnullP;
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int * _Nullable nullableP;
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int * _Null_unspecified unspecifiedP;
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int *noneP;
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p = c ? nonnullP : nonnullP;
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p = c ? nonnullP : nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = c ? nonnullP : unspecifiedP;
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p = c ? nonnullP : noneP;
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p = c ? nullableP : nonnullP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = c ? nullableP : nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = c ? nullableP : unspecifiedP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = c ? nullableP : noneP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = c ? unspecifiedP : nonnullP;
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p = c ? unspecifiedP : nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = c ? unspecifiedP : unspecifiedP;
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p = c ? unspecifiedP : noneP;
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p = c ? noneP : nonnullP;
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p = c ? noneP : nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = c ? noneP : unspecifiedP;
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p = c ? noneP : noneP;
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// Check that we don't remove all sugar when creating a new QualType for the
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// conditional expression.
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typedef int *IntP;
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typedef IntP _Nonnull NonnullIntP0;
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typedef NonnullIntP0 _Nonnull NonnullIntP1;
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typedef IntP _Nullable NullableIntP0;
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typedef NullableIntP0 _Nullable NullableIntP1;
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NonnullIntP1 nonnullP2;
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NullableIntP1 nullableP2;
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p = c ? nonnullP2 : nonnullP2;
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p = c ? nonnullP2 : nullableP2; // expected-warning{{implicit conversion from nullable pointer 'IntP _Nullable' (aka 'int *') to non-nullable pointer type 'int * _Nonnull'}}
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p = c ? nullableP2 : nonnullP2; // expected-warning{{implicit conversion from nullable pointer 'NullableIntP1' (aka 'int *') to non-nullable pointer type 'int * _Nonnull'}}
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p = c ? nullableP2 : nullableP2; // expected-warning{{implicit conversion from nullable pointer 'NullableIntP1' (aka 'int *') to non-nullable pointer type 'int * _Nonnull'}}
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}
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// Check nullability of binary conditional expressions.
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void binary_conditional_expr() {
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int * _Nonnull p;
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int * _Nonnull nonnullP;
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int * _Nullable nullableP;
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int * _Null_unspecified unspecifiedP;
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int *noneP;
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p = nonnullP ?: nonnullP;
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p = nonnullP ?: nullableP;
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p = nonnullP ?: unspecifiedP;
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p = nonnullP ?: noneP;
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p = nullableP ?: nonnullP;
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p = nullableP ?: nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = nullableP ?: unspecifiedP;
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p = nullableP ?: noneP;
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p = unspecifiedP ?: nonnullP;
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p = unspecifiedP ?: nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = unspecifiedP ?: unspecifiedP;
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p = unspecifiedP ?: noneP;
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p = noneP ?: nonnullP;
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p = noneP ?: nullableP; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
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p = noneP ?: unspecifiedP;
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p = noneP ?: noneP;
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}
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extern int GLOBAL_LENGTH;
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// Nullability can appear on arrays when the arrays are in parameter lists.
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void arrays(int ints[_Nonnull],
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void *ptrs[_Nullable],
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void **nestedPtrs[_Nullable],
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void * _Null_unspecified * _Nonnull nestedPtrs2[_Nullable],
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int fixedSize[_Nonnull 2],
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int staticSize[_Nonnull static 2],
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int staticSize2[static _Nonnull 2],
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int starSize[_Nonnull *],
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int vla[_Nonnull GLOBAL_LENGTH],
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void ** _Nullable reference);
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void testDecayedType() {
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int produceAnErrorMessage = arrays; // expected-warning {{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)'}}
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}
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int notInFunction[_Nullable 3]; // expected-error {{nullability specifier '_Nullable' cannot be applied to non-pointer type 'int [3]'}}
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void nestedArrays(int x[5][_Nonnull 1]) {} // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int [1]'}}
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void nestedArrays2(int x[5][_Nonnull 1][2]) {} // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int [1][2]'}}
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void nestedArraysOK(int x[_Nonnull 5][1]) {} // ok
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void nullabilityOnBase(_Nonnull int x[1], // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int'}}
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int _Nonnull y[1]); // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int'}}
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typedef int INTS[4];
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typedef int BAD_INTS[_Nonnull 4]; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int [4]'}}
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void typedefTest(INTS _Nonnull x,
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_Nonnull INTS xx,
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INTS _Nonnull y[2], // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int [4]')}}
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INTS z[_Nonnull 2]);
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INTS _Nonnull x; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int [4]')}}
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_Nonnull INTS x; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int [4]')}}
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void arraysInBlocks() {
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typedef int INTS[4];
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void (^simple)(int [_Nonnull 2]) = ^(int x[_Nonnull 2]) {};
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simple(0); // expected-warning {{null passed to a callee that requires a non-null argument}}
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void (^nested)(void *_Nullable x[_Nonnull 2]) = ^(void *_Nullable x[_Nonnull 2]) {};
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nested(0); // expected-warning {{null passed to a callee that requires a non-null argument}}
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void (^nestedBad)(int x[2][_Nonnull 2]) = // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int [2]'}}
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^(int x[2][_Nonnull 2]) {}; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int [2]'}}
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void (^withTypedef)(INTS _Nonnull) = ^(INTS _Nonnull x) {};
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withTypedef(0); // expected-warning {{null passed to a callee that requires a non-null argument}}
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void (^withTypedefBad)(INTS _Nonnull [2]) = // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int [4]')}}
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^(INTS _Nonnull x[2]) {}; // expected-error {{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'INTS' (aka 'int [4]')}}
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}
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