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# aea7afdc 24-Jun-2015 Douglas Gregor <[email protected]>

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:

__no

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

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Revision tags: llvmorg-3.6.2, llvmorg-3.6.2-rc1
# 261a89b0 19-Jun-2015 Douglas Gregor <[email protected]>

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

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

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