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llvm-project/clang/test/SemaCXX/nullability-declspec.cpp

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Introduce type nullability specifiers for C/C++. Introduces the type specifiers __nonnull, __nullable, and __null_unspecified that describe the nullability of the pointer type to which the specifier appertains. Nullability type specifiers improve on the existing nonnull attributes in a few ways: - They apply to types, so one can represent a pointer to a non-null pointer, use them in function pointer types, etc. - As type specifiers, they are syntactically more lightweight than __attribute__s or [[attribute]]s. - They can express both the notion of 'should never be null' and also 'it makes sense for this to be null', and therefore can more easily catch errors of omission where one forgot to annotate the nullability of a particular pointer (this will come in a subsequent patch). Nullability type specifiers are maintained as type sugar, and therefore have no effect on mangling, encoding, overloading, etc. Nonetheless, they will be used for warnings about, e.g., passing 'null' to a method that does not accept it. This is the C/C++ part of rdar://problem/18868820. llvm-svn: 240146
2015-06-20 01:51:05 +08:00
// RUN: %clang_cc1 -fblocks -Werror=nullability-declspec -verify %s
struct X { };
Replace __double_underscored type nullability qualifiers with _Uppercase_underscored Addresses a conflict with glibc's __nonnull macro by renaming the type nullability qualifiers as follows: __nonnull -> _Nonnull __nullable -> _Nullable __null_unspecified -> _Null_unspecified This is the major part of rdar://problem/21530726, but does not yet provide the Darwin-specific behavior for the old names. llvm-svn: 240596
2015-06-25 06:02:08 +08:00
_Nullable int *ip1; // expected-error{{nullability specifier '_Nullable' cannot be applied to non-pointer type 'int'; did you mean to apply the specifier to the pointer?}}
_Nullable int (*fp1)(int); // expected-error{{nullability specifier '_Nullable' cannot be applied to non-pointer type 'int'; did you mean to apply the specifier to the function pointer?}}
_Nonnull int (^bp1)(int); // expected-error{{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int'; did you mean to apply the specifier to the block pointer?}}
_Nonnull int X::*pmd1; // expected-error{{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int'; did you mean to apply the specifier to the member pointer?}}
_Nonnull int (X::*pmf1)(int); // expected-error{{nullability specifier '_Nonnull' cannot be applied to non-pointer type 'int'; did you mean to apply the specifier to the member function pointer?}}