X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=macros.h;h=08aaa85c883289c987d573f2ea1e81551e0d1044;hb=0ae1a254c74788c7e22f22dcfe9be5a02ec6b270;hp=2d6cfb4f632de1250837e7d026a464e98cde7df2;hpb=ea4ef51b306fde6480c03f72e81c4b31d51660f6;p=bertos.git diff --git a/macros.h b/macros.h index 2d6cfb4f..08aaa85c 100755 --- a/macros.h +++ b/macros.h @@ -5,58 +5,111 @@ * This file is part of DevLib - See devlib/README for information. * --> * - * \version $Id$ + * \brief Common and handy function macros * + * \version $Id$ * \author Bernardo Innocenti * \author Giovanni Bajo - * - * \brief Common and handy function macros */ -/* - * $Log$ - * Revision 1.1 2004/08/14 19:37:57 rasky - * Merge da SC: macros.h, pool.h, BIT_CHANGE, nome dei processi, etc. - * - * Revision 1.4 2004/08/14 18:36:50 rasky - * Doxygen fix e un livello di parentesi aggiuntivi per la macro - * - * Revision 1.3 2004/08/12 20:01:32 rasky - * Aggiunte macro BIT_CHANGE e BIT_CHANGE_BV - * - * Revision 1.2 2004/08/10 21:36:14 rasky - * Aggiunto include macros.h dove serve - * Aggiunta dipendenza da compiler.h in macros.h - * - * Revision 1.1 2004/08/10 21:30:00 rasky - * Estratte le funzioni macro in macros.h - * - */ +/*#* + *#* $Log$ + *#* Revision 1.8 2004/10/19 07:14:20 bernie + *#* Add macros to test for specific compiler features. + *#* + *#* Revision 1.7 2004/09/20 03:30:45 bernie + *#* C++ also has variadic macros. + *#* + *#* Revision 1.6 2004/09/14 21:02:04 bernie + *#* SWAP(), MINMAX(): New macros. + *#* + *#* Revision 1.5 2004/08/29 21:57:58 bernie + *#* Move back STATIC_ASSERT() to compiler.h as it's needed in cpu.h; + *#* iptr_t, const_iptr_t: Replace IPTR macro with a real typedef. + *#* + *#* Revision 1.3 2004/08/24 14:13:48 bernie + *#* Restore a few macros that were lost in the way. + *#* + *#* Revision 1.2 2004/08/24 13:32:14 bernie + *#* PP_CAT(), PP_STRINGIZE(): Move back to compiler.h to break circular dependency between cpu.h/compiler.h/macros.h; + *#* offsetof(), countof(): Move back to compiler.h to avoid including macros.h almost everywhere; + *#* Trim CVS log; + *#* Rename header guards; + *#* Don't include arch_config.h in compiler.h as it's not needed there. + *#* + *#* Revision 1.1 2004/08/14 19:37:57 rasky + *#* Merge da SC: macros.h, pool.h, BIT_CHANGE, nome dei processi, etc. + *#* + *#* Revision 1.4 2004/08/14 18:36:50 rasky + *#* Doxygen fix e un livello di parentesi aggiuntivi per la macro + *#* + *#* Revision 1.3 2004/08/12 20:01:32 rasky + *#* Aggiunte macro BIT_CHANGE e BIT_CHANGE_BV + *#* + *#* Revision 1.2 2004/08/10 21:36:14 rasky + *#* Aggiunto include macros.h dove serve + *#* Aggiunta dipendenza da compiler.h in macros.h + *#* + *#* Revision 1.1 2004/08/10 21:30:00 rasky + *#* Estratte le funzioni macro in macros.h + *#* + *#*/ #ifndef MACROS_H #define MACROS_H #include -/* Quasi-ANSI macros */ -#ifndef offsetof - /*! offsetof(s,m) - Return the byte offset of the member \a m in struct \a s */ - #define offsetof(s,m) (size_t)&(((s *)0)->m) -#endif -#ifndef countof - /*! Count the number of elements in the static array \a a */ - #define countof(a) (sizeof(a) / sizeof(*(a))) -#endif - - -/* Simple macros */ -#define ABS(a) (((a) < 0) ? -(a) : (a)) -#define MIN(a,b) (((a) < (b)) ? (a) : (b)) -#define MAX(a,b) (((a) > (b)) ? (a) : (b)) +#if (COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF) + /* Type-generic macros */ + #define ABS(n) ({ \ + __typeof__(n) _n = (n); \ + (_n < 0) ? -_n : _n; \ + }) + #define MIN(a,b) ({ \ + __typeof__(a) _a = (a); \ + __typeof__(b) _b = (b); \ + (void)(&_a == &_b); /* ensure same type */ \ + (_a < _b) ? _a : _b; \ + }) + #define MAX(a,b) ({ \ + __typeof__(a) _a = (a); \ + __typeof__(b) _b = (b); \ + (void)(&_a == &_b); /* ensure same type */ \ + (_a > _b) ? _a : _b; \ + }) +#else /* !(COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF) */ + /* Buggy macros for inferior compilers. */ + #define ABS(a) (((a) < 0) ? -(a) : (a)) + #define MIN(a,b) (((a) < (b)) ? (a) : (b)) + #define MAX(a,b) (((a) > (b)) ? (a) : (b)) +#endif /* !(COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF) */ + +/*! Bound \a x between \a min and \a max. */ +#define MINMAX(min,x,max) (MIN(MAX(min, x), max)) + +#if COMPILER_TYPEOF + /*! + * Type-generic macro to swap \a a with \a b. + * + * \note Arguments are evaluated multiple times. + */ + #define SWAP(a, b) \ + do { \ + (void)(&(a) == &(b)); /* type check */ \ + typeof(a) tmp; \ + tmp = (a); \ + (a) = (b); \ + (b) = tmp; \ + } while (0) +#else /* !COMPILER_TYPEOF */ + /* Sub-optimal implementation that only works with integral types. */ + #define SWAP(a, b) ((a) ^= (b) ^= (a) ^= (b)) +#endif /* COMPILER_TYPEOF */ #ifndef BV -/*! Convert a bit value to a binary flag */ -#define BV(x) (1<<(x)) + /*! Convert a bit value to a binary flag. */ + #define BV(x) (1<<(x)) #endif /*! Round up \a x to an even multiple of the 2's power \a pad */ @@ -83,31 +136,15 @@ #define UINT32_LOG2(x) \ ((x < 65536UL) ? UINT16_LOG2(x) : UINT16_LOG2((x) >> 16) + 16) -/*! Concatenate two different preprocessor tokens (allowing macros to expand) */ -#define PP_CAT(x,y) PP_CAT__(x,y) -#define PP_CAT__(x,y) x ## y -#define PP_CAT3(x,y,z) PP_CAT(PP_CAT(x,y),z) -#define PP_CAT4(x,y,z,w) PP_CAT(PP_CAT3(x,y,z),w) -#define PP_CAT5(x,y,z,w,j) PP_CAT(PP_CAT4(x,y,z,w),j) - -/*! String-ize a token (allowing macros to expand) */ -#define PP_STRINGIZE(x) PP_STRINGIZE__(x) -#define PP_STRINGIZE__(x) #x - -#if COMPILER_C99 - /*! Count the number of arguments (up to 16) */ +#if COMPILER_VARIADIC_MACROS + /*! Count the number of arguments (up to 16). */ #define PP_COUNT(...) \ PP_COUNT__(__VA_ARGS__,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0) #define PP_COUNT__(a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,count,...) \ count #endif -/*! Issue a compilation error if the \a condition is false */ -#define STATIC_ASSERT(condition) \ - extern char CT_ASSERT___[(condition) ? 1 : -1] - - -#if COMPILER_C99 +#if COMPILER_VARIADIC_MACROS /*! * \def BIT_CHANGE(reg, (mask, value), ...) * @@ -145,7 +182,6 @@ * \note This macro is available only in C99 because it makes use of variadic macros. * It would be possible to make up an implementation with a slightly different syntax * for use with C90 compilers, through Boost Preprocessor. - * */ /*! @@ -153,7 +189,6 @@ * * Similar to BIT_CHANGE(), but get bits instead of masks (and applies BV() to convert * them to masks). - * */ #define BIT_EXTRACT_FLAG_0(bit, value) bit @@ -206,7 +241,7 @@ #define BIT_CHANGE(reg, ...) BIT_CHANGE__(reg, 0, __VA_ARGS__) #define BIT_CHANGE_BV(reg, ...) BIT_CHANGE__(reg, 1, __VA_ARGS__) -#endif /* COMPILER_C99 */ +#endif /* COMPILER_VARIADIC_MACROS */ #endif /* MACROS_H */