/******************************************************************************
 * The MIT License
 *
 * Copyright (c) 2010 Perry Hung.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *****************************************************************************/

/**
 * @file libmaple/include/libmaple/util.h
 * @brief Miscellaneous utility macros and procedures.
 */

#ifndef _LIBMAPLE_UTIL_H_
#define _LIBMAPLE_UTIL_H_

#ifdef __cplusplus
extern "C"{
#endif

#include <libmaple/libmaple_types.h>

/*
 * Bit manipulation
 */

/** 1UL shifted left by 'shift' */
#define BIT(shift)                     (1UL << (shift))
/** 'Mask' shifted left by 'shift' */
#define BIT_MASK_SHIFT(mask, shift)    ((mask) << (shift))
/** Bits m to n of x */
#define GET_BITS(x, m, n) ((((uint32)x) << (31 - (n))) >> ((31 - (n)) + (m)))
/** True iff v is a power of two (1, 2, 4, 8, ...) */
#define IS_POWER_OF_TWO(v)  ((v) && !((v) & ((v) - 1)))

/*
 * Failure routines
 */

void __error(void);
void _fail(const char*, int, const char*);
void throb(void);

/*
 * Asserts and debug levels
 */

#define DEBUG_NONE      0
#define DEBUG_FAULT     1
#define DEBUG_ALL       2

/**
 * \def DEBUG_LEVEL
 *
 * Controls the level of assertion checking.
 *
 * The higher the debug level, the more assertions will be compiled
 * in.  This increases the amount of debugging information, but slows
 * down (and increases the size of) the binary.
 *
 * The debug levels, from lowest to highest, are DEBUG_NONE,
 * DEBUG_FAULT, and DEBUG_ALL.  The default level is DEBUG_ALL.
 */

#ifndef DEBUG_LEVEL
#define DEBUG_LEVEL DEBUG_ALL
#endif

#if DEBUG_LEVEL >= DEBUG_ALL
#define ASSERT(exp)                              \
    if (exp) {                                   \
    } else {                                     \
        _fail(__FILE__, __LINE__, #exp);         \
    }
#else
#define ASSERT(exp) (void)((0))
#endif

#if DEBUG_LEVEL >= DEBUG_FAULT
#define ASSERT_FAULT(exp)                       \
    if (exp) {                                  \
    } else {                                    \
        _fail(__FILE__, __LINE__, #exp);        \
    }
#else
#define ASSERT_FAULT(exp) (void)((0))
#endif

#ifdef __cplusplus
} // extern "C"
#endif

#endif