* This file is part of DevLib - See devlib/README for information.
* -->
*
- * \version $Id$
+ * \brief Common and handy function macros
*
+ * \version $Id$
* \author Bernardo Innocenti <bernie@develer.com>
* \author Giovanni Bajo <rasky@develer.com>
- *
- * \brief Common and handy function macros
*/
-/*
- * $Log$
- * 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
- *
- */
+/*#*
+ *#* $Log$
+ *#* 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 <compiler.h>
-/* Type-generic macros */
-#if GNUC_PREREQ(2,0)
+#if (COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF)
+ /* Type-generic macros */
#define ABS(n) ({ \
__typeof__(n) _n = (n); \
(_n < 0) ? -_n : _n; \
(void)(&_a == &_b); /* ensure same type */ \
(_a > _b) ? _a : _b; \
})
-#else /* !GNUC */
+#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 /* !GNUC */
+#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 */
#define UINT32_LOG2(x) \
((x < 65536UL) ? UINT16_LOG2(x) : UINT16_LOG2((x) >> 16) + 16)
-#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 PP_CAT(CT_ASSERT___, __LINE__)[(condition) ? 1 : -1]
-
-#if COMPILER_C99
+#if COMPILER_VARIADIC_MACROS
/*!
* \def BIT_CHANGE(reg, (mask, value), ...)
*
* \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.
- *
*/
/*!
*
* 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
#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 */
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