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Refactor _LIBCPP_<LITTLE|BIG>_ENDIAN 

Previously this macro used 0/1 to indicate if it was set.
This is unlike all other libc++ configuration macros which
use ifdef/ifndef.

This patch makes this macro consistent with everything else.

llvm-svn: 315995
This commit is contained in:
Eric Fiselier 2017-10-17 13:16:01 +00:00
parent 1c0cedccb6
commit da0183947f
2 changed files with 22 additions and 35 deletions
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43
libcxx/include/__config
View File

@ -184,36 +184,30 @@
#ifdef __LITTLE_ENDIAN__
#if __LITTLE_ENDIAN__
#define _LIBCPP_LITTLE_ENDIAN 1
#define _LIBCPP_BIG_ENDIAN 0
#define _LIBCPP_LITTLE_ENDIAN
#endif // __LITTLE_ENDIAN__
#endif // __LITTLE_ENDIAN__
#ifdef __BIG_ENDIAN__
#if __BIG_ENDIAN__
#define _LIBCPP_LITTLE_ENDIAN 0
#define _LIBCPP_BIG_ENDIAN 1
#define _LIBCPP_BIG_ENDIAN
#endif // __BIG_ENDIAN__
#endif // __BIG_ENDIAN__
#ifdef __BYTE_ORDER__
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define _LIBCPP_LITTLE_ENDIAN 1
#define _LIBCPP_BIG_ENDIAN 0
#define _LIBCPP_LITTLE_ENDIAN
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define _LIBCPP_LITTLE_ENDIAN 0
#define _LIBCPP_BIG_ENDIAN 1
#define _LIBCPP_BIG_ENDIAN
#endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#endif // __BYTE_ORDER__
#ifdef __FreeBSD__
# include <sys/endian.h>
# if _BYTE_ORDER == _LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN 0
# define _LIBCPP_LITTLE_ENDIAN
# else // _BYTE_ORDER == _LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN 0
# define _LIBCPP_BIG_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN
# endif // _BYTE_ORDER == _LITTLE_ENDIAN
# ifndef __LONG_LONG_SUPPORTED
# define _LIBCPP_HAS_NO_LONG_LONG
@ -223,19 +217,16 @@
#ifdef __NetBSD__
# include <sys/endian.h>
# if _BYTE_ORDER == _LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN 0
# define _LIBCPP_LITTLE_ENDIAN
# else // _BYTE_ORDER == _LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN 0
# define _LIBCPP_BIG_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN
# endif // _BYTE_ORDER == _LITTLE_ENDIAN
# define _LIBCPP_HAS_QUICK_EXIT
#endif // __NetBSD__
#if defined(_WIN32)
# define _LIBCPP_WIN32API
# define _LIBCPP_LITTLE_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN 0
# define _LIBCPP_LITTLE_ENDIAN
# define _LIBCPP_SHORT_WCHAR 1
// Both MinGW and native MSVC provide a "MSVC"-like enviroment
# define _LIBCPP_MSVCRT_LIKE
@ -265,11 +256,9 @@
#ifdef __sun__
# include <sys/isa_defs.h>
# ifdef _LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN 0
# define _LIBCPP_LITTLE_ENDIAN
# else
# define _LIBCPP_LITTLE_ENDIAN 0
# define _LIBCPP_BIG_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN
# endif
#endif // __sun__
@ -290,18 +279,16 @@
# define _LIBCPP_USING_DEV_RANDOM
#endif
#if !defined(_LIBCPP_LITTLE_ENDIAN) || !defined(_LIBCPP_BIG_ENDIAN)
#if !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN)
# include <endian.h>
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN 0
# define _LIBCPP_LITTLE_ENDIAN
# elif __BYTE_ORDER == __BIG_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN 0
# define _LIBCPP_BIG_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN
# else // __BYTE_ORDER == __BIG_ENDIAN
# error unable to determine endian
# endif
#endif // !defined(_LIBCPP_LITTLE_ENDIAN) || !defined(_LIBCPP_BIG_ENDIAN)
#endif // !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN)
#if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC)
#define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi")))

14
libcxx/include/string
View File

@ -670,7 +670,7 @@ private:
size_type __cap_;
};
#if _LIBCPP_BIG_ENDIAN
#ifdef _LIBCPP_BIG_ENDIAN
static const size_type __short_mask = 0x01;
static const size_type __long_mask = 0x1ul;
#else // _LIBCPP_BIG_ENDIAN
@ -700,7 +700,7 @@ private:
pointer __data_;
};
#if _LIBCPP_BIG_ENDIAN
#ifdef _LIBCPP_BIG_ENDIAN
static const size_type __short_mask = 0x80;
static const size_type __long_mask = ~(size_type(~0) >> 1);
#else // _LIBCPP_BIG_ENDIAN
@ -1241,7 +1241,7 @@ private:
_LIBCPP_INLINE_VISIBILITY
void __set_short_size(size_type __s) _NOEXCEPT
# if _LIBCPP_BIG_ENDIAN
# ifdef _LIBCPP_BIG_ENDIAN
{__r_.first().__s.__size_ = (unsigned char)(__s << 1);}
# else
{__r_.first().__s.__size_ = (unsigned char)(__s);}
@ -1249,7 +1249,7 @@ private:
_LIBCPP_INLINE_VISIBILITY
size_type __get_short_size() const _NOEXCEPT
# if _LIBCPP_BIG_ENDIAN
# ifdef _LIBCPP_BIG_ENDIAN
{return __r_.first().__s.__size_ >> 1;}
# else
{return __r_.first().__s.__size_;}
@ -1259,7 +1259,7 @@ private:
_LIBCPP_INLINE_VISIBILITY
void __set_short_size(size_type __s) _NOEXCEPT
# if _LIBCPP_BIG_ENDIAN
# ifdef _LIBCPP_BIG_ENDIAN
{__r_.first().__s.__size_ = (unsigned char)(__s);}
# else
{__r_.first().__s.__size_ = (unsigned char)(__s << 1);}
@ -1267,7 +1267,7 @@ private:
_LIBCPP_INLINE_VISIBILITY
size_type __get_short_size() const _NOEXCEPT
# if _LIBCPP_BIG_ENDIAN
# ifdef _LIBCPP_BIG_ENDIAN
{return __r_.first().__s.__size_;}
# else
{return __r_.first().__s.__size_ >> 1;}
@ -2870,7 +2870,7 @@ typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::max_size() const _NOEXCEPT
{
size_type __m = __alloc_traits::max_size(__alloc());
#if _LIBCPP_BIG_ENDIAN
#ifdef _LIBCPP_BIG_ENDIAN
return (__m <= ~__long_mask ? __m : __m/2) - __alignment;
#else
return __m - __alignment;