* 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 1.1 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 1.9 2004/12/08 08:51:34 bernie
+ *#* Add type-generic macros for C++.
+ *#*
+ *#* 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>
-/* 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
+/* avr-gcc does not seem to support libstdc++ */
+#if defined(__cplusplus) && !CPU_AVR
+ /* Type-generic macros implemented with template functions. */
+ #include <algorithm>
+
+ template<class T> inline T ABS(T n) { return n >= 0 ? n : -n; }
+ #define MIN(a,b) std::min(a, b)
+ #define MAX(a,b) std::max(a, b)
+ #define SWAP(a,b) std::swap(a, b)
+#elif (COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF)
+ /* Type-generic macros implemented with statement expressions. */
+ #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))
-/* 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))
+#ifdef __cplusplus
+ /* Use standard implementation from <algorithm> */
+ #define SWAP(a,b) std::swap(a, b)
+#elif 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)
-/*! 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), ...)
*
* \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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