cenv.h File Reference

Environment macros introduced for portability This file must be kept C compliant. More...

#include <stdarg.h>

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Macros
#define	SPS_LIKELY(x)   (x)
#define	SPS_UNLIKELY(x)   (x)
#define	SPS_ASS_ALIGNED(x, y)   (x)
#define	__BEGIN__   {
#define	__END__   goto exit; exit: ; }
#define	STR_HELPER(x)   #x
#define	STR(x)   STR_HELPER(x)
#define	NUMARGS(...)    SELECT_5TH(__VA_ARGS__, 4, 3, 2, 1, 0, throwaway, throwaway)
#define	SELECT_5TH(a1, a2, a3, a4, a5, ...)   a5
#define	RETURN_FIRST(...)   RETURN_FIRST_HELPER(__VA_ARGS__, throwaway)
#define	RETURN_FIRST_HELPER(first, ...)   return first;
#define	FIRST(...)   FIRST_HELPER(__VA_ARGS__, throwaway)
#define	FIRST_HELPER(first, ...)   first
#define	REST(...)   REST_HELPER(NNUM(__VA_ARGS__), __VA_ARGS__)
#define	REST_HELPER(qty, ...)   REST_HELPER2(qty, __VA_ARGS__)
#define	REST_HELPER2(qty, ...)   REST_HELPER_##qty(__VA_ARGS__)
#define	REST_HELPER_ONE(first)
#define	REST_HELPER_TWOORMORE(first, ...)   , __VA_ARGS__
#define	NNUM(...)
#define	SELECT_10TH(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, ...)   a10
#define	CONCATENATE(arg1, arg2)   CONCATENATE1(arg1, arg2)
#define	CONCATENATE1(arg1, arg2)   CONCATENATE2(arg1, arg2)
#define	CONCATENATE2(arg1, arg2)   arg1##arg2
#define	FOR_EACH_1(what, x)    what(x)
#define	FOR_EACH_2(what, x, ...)
#define	FOR_EACH_3(what, x, ...)
#define	FOR_EACH_4(what, x, ...)
#define	FOR_EACH_5(what, x, ...)
#define	FOR_EACH_6(what, x, ...)
#define	FOR_EACH_7(what, x, ...)
#define	FOR_EACH_8(what, x, ...)
#define	FOR_EACH_9(what, x, ...)
#define	FOR_EACH_10(what, x, ...)
#define	FOR_EACH_11(what, x, ...)
#define	FOR_EACH_12(what, x, ...)
#define	FOR_EACH_13(what, x, ...)
#define	FOR_EACH_NARG(...)   FOR_EACH_NARG_(__VA_ARGS__, FOR_EACH_RSEQ_N())
#define	FOR_EACH_NARG_(...)   FOR_EACH_ARG_N(__VA_ARGS__)
#define	FOR_EACH_ARG_N(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, N, ...)   N
#define	FOR_EACH_RSEQ_N()   12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
#define	FOR_EACH_(N, what, ...)   CONCATENATE(FOR_EACH_, N)(what, __VA_ARGS__)
#define	FOR_EACH(what, ...)   FOR_EACH_(FOR_EACH_NARG(__VA_ARGS__), what, __VA_ARGS__)
#define	SPS_UNREFERENCED_PARAMETER(x)   ((void)(x))
#define	SPS_UNREFERENCED_PARAMETERS(...)   FOR_EACH( SPS_UNREFERENCED_PARAMETER, __VA_ARGS__)
#define	SPS_ATTR_DESTRUCTOR   __attribute__((destructor(101)))

Detailed Description

Environment macros introduced for portability This file must be kept C compliant.

Author

Jens Munk Hansen jens..nosp@m.munk.nosp@m..hans.nosp@m.en@g.nosp@m.mail..nosp@m.com

Date

Sat Nov 29 17:48:45 2014

Macro Definition Documentation

__BEGIN__

#define __BEGIN__   {

__END__

#define __END__   goto exit; exit: ; }

CONCATENATE

#define CONCATENATE	(		arg1,
			arg2
	)		CONCATENATE1(arg1, arg2)

CONCATENATE1

#define CONCATENATE1	(		arg1,
			arg2
	)		CONCATENATE2(arg1, arg2)

CONCATENATE2

#define CONCATENATE2	(		arg1,
			arg2
	)		arg1##arg2

FIRST

#define FIRST

(

...

)

FIRST_HELPER(__VA_ARGS__, throwaway)

FIRST_HELPER

#define FIRST_HELPER	(		first,
			...
	)		first

FOR_EACH

#define FOR_EACH	(		what,
			...
	)		FOR_EACH_(FOR_EACH_NARG(__VA_ARGS__), what, __VA_ARGS__)

FOR_EACH_

#define FOR_EACH_	(		N,
			what,
			...
	)		CONCATENATE(FOR_EACH_, N)(what, __VA_ARGS__)

FOR_EACH_1

#define FOR_EACH_1	(		what,
			x
	)		what(x)

FOR_EACH_10

#define FOR_EACH_10	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_9(what,  __VA_ARGS__);

FOR_EACH_11

#define FOR_EACH_11	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_10(what,  __VA_ARGS__);

FOR_EACH_12

#define FOR_EACH_12	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_11(what,  __VA_ARGS__);

FOR_EACH_13

#define FOR_EACH_13	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_12(what,  __VA_ARGS__);

FOR_EACH_2

#define FOR_EACH_2	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_1(what, __VA_ARGS__);

FOR_EACH_3

#define FOR_EACH_3	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_2(what, __VA_ARGS__);

FOR_EACH_4

#define FOR_EACH_4	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_3(what,  __VA_ARGS__);

FOR_EACH_5

#define FOR_EACH_5	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_4(what,  __VA_ARGS__);

FOR_EACH_6

#define FOR_EACH_6	(		what,
			x,
			...
	)

Value:

  what(x);                          \
  FOR_EACH_5(what,  __VA_ARGS__);

FOR_EACH_7

#define FOR_EACH_7	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_6(what,  __VA_ARGS__);

FOR_EACH_8

#define FOR_EACH_8	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_7(what,  __VA_ARGS__);

FOR_EACH_9

#define FOR_EACH_9	(		what,
			x,
			...
	)

Value:

    what(x);                        \
    FOR_EACH_8(what,  __VA_ARGS__);

FOR_EACH_ARG_N

#define FOR_EACH_ARG_N	(		_1,
			_2,
			_3,
			_4,
			_5,
			_6,
			_7,
			_8,
			_9,
			_10,
			_11,
			_12,
			N,
			...
	)		N

FOR_EACH_NARG

#define FOR_EACH_NARG

(

...

)

FOR_EACH_NARG_(__VA_ARGS__, FOR_EACH_RSEQ_N())

FOR_EACH_NARG_

#define FOR_EACH_NARG_

(

...

)

FOR_EACH_ARG_N(__VA_ARGS__)

FOR_EACH_RSEQ_N

#define FOR_EACH_RSEQ_N

(

)

12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0

NNUM

#define NNUM

(

...

)

Value:

    SELECT_10TH(__VA_ARGS__, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE,\
                TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, ONE, throwaway)

NUMARGS

#define NUMARGS

(

...

)

SELECT_5TH(__VA_ARGS__, 4, 3, 2, 1, 0, throwaway, throwaway)

REST

#define REST

(

...

)

REST_HELPER(NNUM(__VA_ARGS__), __VA_ARGS__)

REST_HELPER

#define REST_HELPER	(		qty,
			...
	)		REST_HELPER2(qty, __VA_ARGS__)

REST_HELPER2

#define REST_HELPER2	(		qty,
			...
	)		REST_HELPER_##qty(__VA_ARGS__)

REST_HELPER_ONE

#define REST_HELPER_ONE

(

first

)

REST_HELPER_TWOORMORE

#define REST_HELPER_TWOORMORE	(		first,
			...
	)		, __VA_ARGS__

RETURN_FIRST

#define RETURN_FIRST

(

...

)

RETURN_FIRST_HELPER(__VA_ARGS__, throwaway)

RETURN_FIRST_HELPER

#define RETURN_FIRST_HELPER	(		first,
			...
	)		return first;

SELECT_10TH

#define SELECT_10TH	(		a1,
			a2,
			a3,
			a4,
			a5,
			a6,
			a7,
			a8,
			a9,
			a10,
			...
	)		a10

SELECT_5TH

#define SELECT_5TH	(		a1,
			a2,
			a3,
			a4,
			a5,
			...
	)		a5

SPS_ASS_ALIGNED

#define SPS_ASS_ALIGNED	(		x,
			y
	)		(x)

SPS_ATTR_DESTRUCTOR

#define SPS_ATTR_DESTRUCTOR   __attribute__((destructor(101)))

SPS_LIKELY

#define SPS_LIKELY

(

x

)

(x)

Todo:

: Add other OS'es

Todo:

: Use alignas if present

SPS_UNLIKELY

#define SPS_UNLIKELY

(

x

)

(x)

SPS_UNREFERENCED_PARAMETER

#define SPS_UNREFERENCED_PARAMETER

(

x

)

((void)(x))

SPS_UNREFERENCED_PARAMETERS

#define SPS_UNREFERENCED_PARAMETERS

(

...

)

FOR_EACH( SPS_UNREFERENCED_PARAMETER, __VA_ARGS__)

STR

#define STR

(

x

)

STR_HELPER(x)

STR_HELPER

#define STR_HELPER

(

x

)

#x

Todo:

: Make file with helper macros