Commit 3e9fd4e9 authored by Vincent Dagonneau's avatar Vincent Dagonneau Committed by Paul E. McKenney
Browse files

tools/nolibc: add integer types and integer limit macros 

This commit adds some of the missing integer types to stdint.h and adds
limit macros (e.g. INTN_{MIN,MAX}).

The reference used for adding these types is
https://pubs.opengroup.org/onlinepubs/009695399/basedefs/stdint.h.html

.

We rely on the compiler-defined __LONG_MAX__ to get the right limits for
size_t, intptr_t, uintptr_t and ptrdiff_t. This compiler constant seem
to have been defined at least since GCC 4.1.2 and clang
3.0.0 on x86_64. It is also defined on ARM (32&64), mips and RISC-V.

Note that the maximum size of size_t is implementation-defined (>65535),
in this case I chose to go with unsigned long on all platforms since
unsigned long == unsigned int on all the platforms we care about. Note
that the kernel uses either unsigned int or unsigned long in
linux/include/uapi/asm-generic/posix_types.h. These should be equivalent
for the plaforms we are targeting.

Also note that the 'fast*' flavor of the types have been chosen to be
always 1 byte for '*fast8*' and always long (a.k.a. intptr_t/uintptr_t) for
the other variants. I have never seen the 'fast*' types in use in the wild
but that seems to be what glibc does.

Signed-off-by: default avatarVincent Dagonneau <v@vda.io>
Reviewed-by: default avatarThomas Weißschuh <linux@weissschuh.net>
Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent c34da317

tools/include/nolibc/stdint.h

+75 −0
Original line number Diff line number Diff line
@@ -21,4 +21,79 @@ typedef unsigned long uintptr_t; 
typedef   signed long      intptr_t;

typedef   signed long     ptrdiff_t;



typedef   int8_t       int_least8_t;

typedef  uint8_t      uint_least8_t;

typedef  int16_t      int_least16_t;

typedef uint16_t     uint_least16_t;

typedef  int32_t      int_least32_t;

typedef uint32_t     uint_least32_t;

typedef  int64_t      int_least64_t;

typedef uint64_t     uint_least64_t;



typedef   int8_t        int_fast8_t;

typedef  uint8_t       uint_fast8_t;

typedef  ssize_t       int_fast16_t;

typedef   size_t      uint_fast16_t;

typedef  ssize_t       int_fast32_t;

typedef   size_t      uint_fast32_t;

typedef  ssize_t       int_fast64_t;

typedef   size_t      uint_fast64_t;



typedef  int64_t           intmax_t;

typedef uint64_t          uintmax_t;



/* limits of integral types */



#define        INT8_MIN  (-128)

#define       INT16_MIN  (-32767-1)

#define       INT32_MIN  (-2147483647-1)

#define       INT64_MIN  (-9223372036854775807LL-1)



#define        INT8_MAX  (127)

#define       INT16_MAX  (32767)

#define       INT32_MAX  (2147483647)

#define       INT64_MAX  (9223372036854775807LL)



#define       UINT8_MAX  (255)

#define      UINT16_MAX  (65535)

#define      UINT32_MAX  (4294967295U)

#define      UINT64_MAX  (18446744073709551615ULL)



#define  INT_LEAST8_MIN  INT8_MIN

#define INT_LEAST16_MIN  INT16_MIN

#define INT_LEAST32_MIN  INT32_MIN

#define INT_LEAST64_MIN  INT64_MIN



#define  INT_LEAST8_MAX  INT8_MAX

#define INT_LEAST16_MAX  INT16_MAX

#define INT_LEAST32_MAX  INT32_MAX

#define INT_LEAST64_MAX  INT64_MAX



#define  UINT_LEAST8_MAX UINT8_MAX

#define UINT_LEAST16_MAX UINT16_MAX

#define UINT_LEAST32_MAX UINT32_MAX

#define UINT_LEAST64_MAX UINT64_MAX



#define SIZE_MAX         ((size_t)(__LONG_MAX__) * 2 + 1)

#define INTPTR_MIN       (-__LONG_MAX__ - 1)

#define INTPTR_MAX       __LONG_MAX__

#define PTRDIFF_MIN      INTPTR_MIN

#define PTRDIFF_MAX      INTPTR_MAX

#define UINTPTR_MAX      SIZE_MAX



#define  INT_FAST8_MIN   INT8_MIN

#define INT_FAST16_MIN   INTPTR_MIN

#define INT_FAST32_MIN   INTPTR_MIN

#define INT_FAST64_MIN   INTPTR_MIN



#define  INT_FAST8_MAX   INT8_MAX

#define INT_FAST16_MAX   INTPTR_MAX

#define INT_FAST32_MAX   INTPTR_MAX

#define INT_FAST64_MAX   INTPTR_MAX



#define  UINT_FAST8_MAX  UINT8_MAX

#define UINT_FAST16_MAX  SIZE_MAX

#define UINT_FAST32_MAX  SIZE_MAX

#define UINT_FAST64_MAX  SIZE_MAX



#endif /* _NOLIBC_STDINT_H */