/**************************************************************************************************
  Filename:       hal_assert.h
  Revised:        $Date: 2009-02-16 18:03:22 -0800 (Mon, 16 Feb 2009) $
  Revision:       $Revision: 19172 $

  Description:    Describe the purpose and contents of the file.


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**************************************************************************************************/

#ifndef HAL_ASSERT_H
#define HAL_ASSERT_H

/* ------------------------------------------------------------------------------------------------
 *                                           Macros
 * ------------------------------------------------------------------------------------------------
 */

/*
 *  HAL_ASSERT( expression ) - The given expression must evaluate as "true" or else the assert
 *  handler is called.  From here, the call stack feature of the debugger can pinpoint where
 * the problem occurred.
 *
 *  HAL_ASSERT_FORCED( ) - If asserts are in use, immediately calls the assert handler.
 *
 *  HAL_ASSERT_STATEMENT( statement ) - Inserts the given C statement but only when asserts
 *  are in use.  This macros allows debug code that is not part of an expression.
 *
 *  HAL_ASSERT_DECLARATION( declaration ) - Inserts the given C declaration but only when asserts
 *  are in use.  This macros allows debug code that is not part of an expression.
 *
 *  Asserts can be disabled for optimum performance and minimum code size (ideal for
 *  finalized, debugged production code).  To disable, define the preprocessor
 *  symbol HALNODEBUG at the project level.
 */


#ifdef HALNODEBUG
#define HAL_ASSERT(expr)
#define HAL_ASSERT_FORCED()
#define HAL_ASSERT_STATEMENT(statement)
#define HAL_ASSERT_DECLARATION(declaration)
#else
#define HAL_ASSERT(expr)                        st( if (!( expr )) halAssertHandler(); )
#define HAL_ASSERT_FORCED()                     halAssertHandler()
#define HAL_ASSERT_STATEMENT(statement)         st( statement )
#define HAL_ASSERT_DECLARATION(declaration)     declaration
#endif


/*
 *  This macro compares the size of the first parameter to the integer value
 *  of the second parameter.  If they do not match, a compile time error for
 *  negative array size occurs (even gnu chokes on negative array size).
 *
 *  This compare is done by creating a typedef for an array.  No variables are
 *  created and no memory is consumed with this check.  The created type is
 *  used for checking only and is not for use by any other code.  The value
 *  of 10 in this macro is arbitrary, it just needs to be a value larger
 *  than one to result in a positive number for the array size.
 */
#define HAL_ASSERT_SIZE(x,y) typedef char x ## _assert_size_t[-1+10*(sizeof(x) == (y))]


/* ------------------------------------------------------------------------------------------------
 *                                          Prototypes
 * ------------------------------------------------------------------------------------------------
 */
void halAssertHandler(void);


/**************************************************************************************************
 */

/**************************************************************************************************
 *                                        FUNCTIONS - API
 **************************************************************************************************/


extern void halAssertHazardLights(void);
#endif
