MISRA C:2012  Rule-20.7:  (Required)			Expressions resulting from the expansion of macro parameters shall be enclosed in parentheses

Amplification:

If the expansion of any macro parameter produces a token, or sequence of tokens, that form an expression then that expression, in the fully-expanded macro, shall either:

• Be a parenthesized expression itself; or
• Be enclosed in parentheses.

Note: this does not necessarily require that all macro parameters are parenthesised; it is acceptable for parentheses to be provided in macro arguments.

Example Code:

#include "misra.h"
#include "m3cmex.h"

#define  MAXCONST     5                                    /*           */
#define  MAX1( A,B )  ((( A ) > ( B )) ? ( A ) : ( B ))    /*      3453 */
#define  MAX2( A,B )  ((( A > B ) ? A : B ))               /* 3410 3453 */

extern int16_t rule_2007( void )
{
    int16_t i;
    int16_t j;
    int16_t k = MAXCONST;

    i = MAX1( s16a, s16b );
    j = MAX2( s16a, s16b );

    return i + j + k;
}

QAC messages that encompass this guideline:

3410	Macro parameter not enclosed in ().

(c) The Motor Industry Research Association, 2012

QA C Source Code Analyser 8.1.2 MISRA C:2012 Compliance Module 1.0 © 2013 Programming Research www.programmingresearch.com

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