/**
* \file
* <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
* Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
- * This file is part of DevLib - See README.devlib for information.
+ *
* -->
*
* \brief Common and handy function macros
* \author Bernardo Innocenti <bernie@develer.com>
* \author Giovanni Bajo <rasky@develer.com>
*/
-
-/*#*
- *#* $Log$
- *#* Revision 1.11 2007/02/06 15:22:12 asterix
- *#* Add ROTL and ROTR macros for bit rotating.
- *#*
- *#* Revision 1.10 2006/09/13 18:31:37 bernie
- *#* BV8(), BV16(), BV32(): New macros for CPUs with small word size; SWAP_T(): New macro to support old compilers.
- *#*
- *#* Revision 1.9 2006/07/19 12:56:25 bernie
- *#* Convert to new Doxygen style.
- *#*
- *#* Revision 1.8 2006/03/13 02:06:55 bernie
- *#* ROUND_UP2: Rename from ROUND2.
- *#*
- *#* Revision 1.7 2006/02/20 14:34:58 bernie
- *#* Use portable type checking.
- *#*
- *#* Revision 1.6 2006/02/10 12:36:57 bernie
- *#* Pacify IAR warnings for side-effects.
- *#*
- *#* Revision 1.5 2005/11/04 16:20:01 bernie
- *#* Fix reference to README.devlib in header.
- *#*
- *#* Revision 1.4 2005/07/03 15:19:09 bernie
- *#* Doxygen fix.
- *#*
- *#* Revision 1.3 2005/06/27 21:23:32 bernie
- *#* ROUND_DOWN, ROUND_UP, ROUND_NEAREST: New macros.
- *#*
- *#* Revision 1.2 2005/04/11 19:10:27 bernie
- *#* Include top-level headers from cfg/ subdir.
- *#*
- *#* Revision 1.1 2005/04/11 19:04:13 bernie
- *#* Move top-level headers to cfg/ subdir.
- *#*
- *#* Revision 1.10 2005/01/22 04:19:50 bernie
- *#* Use non-uglified typeof().
- *#*
- *#* 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
+#ifndef CFG_MACROS_H
+#define CFG_MACROS_H
#include <cfg/compiler.h>
typeof(a) _a = (a); \
typeof(b) _b = (b); \
ASSERT_TYPE_EQUAL(_a, _b); \
- (_a < _b) ? _a : _b; \
+ /** \
+ * The (typeof(_a)) cast in necessary: \
+ * result type of conditional expressions is \
+ * *NOT* the type of the value returned but \
+ * the type that would be produced if _a and _b \
+ * were mixed in an expression. \
+ * Even in _a and _b are of the same type, \
+ * if mixed in an expression the type will be \
+ * promoted to int! \
+ */ \
+ ((typeof(_a))((_a < _b) ? _a : _b)); \
})
#define MAX(a,b) ({ \
typeof(a) _a = (a); \
typeof(b) _b = (b); \
ASSERT_TYPE_EQUAL(_a, _b); \
- (_a > _b) ? _a : _b; \
+ /** \
+ * The (typeof(_a)) cast in necessary: \
+ * result type of conditional expressions is \
+ * *NOT* the type of the value returned but \
+ * the type that would be produced if _a and _b \
+ * were mixed in an expression. \
+ * Even in _a and _b are of the same type, \
+ * if mixed in an expression the type will be \
+ * promoted to int! \
+ */ \
+ ((typeof(_a))((_a > _b) ? _a : _b)); \
})
#else /* !(COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF) */
/* Buggy macros for inferior compilers. */
/** Same as BV() but with 8 bit result */
#define BV8(x) ((uint8_t)1<<(x))
-
+/**
+ * Perform an integer division rounding the result to the nearest int value.
+ * \note \a divisor should preferibly be a costant, otherwise this macro generates
+ * 2 division. Also divisor is evaluated twice.
+ */
+#define DIV_ROUND(dividend, divisor) (((dividend) + (divisor) / 2) / (divisor))
/** Round up \a x to an even multiple of the 2's power \a pad. */
#define ROUND_UP2(x, pad) (((x) + ((pad) - 1)) & ~((pad) - 1))
#define ROTL(var, rot) (((var) << (rot)) | ((var) >> ((sizeof(var) * 8) - (rot))))
/*\}*/
+/**
+ * Make an id from 4 letters, useful for
+ * file formats and kfile ids.
+ */
+#define MAKE_ID(a,b,c,d) \
+ ( ((uint32_t)(a) << 24) \
+ | ((uint32_t)(b) << 16) \
+ | ((uint32_t)(c) << 8) \
+ | ((uint32_t)(d) << 0) )
+
+/**
+ * Type for id generated by MAKE_ID().
+ */
+typedef uint32_t id_t;
+
#endif /* MACROS_H */
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