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 111 <div class="title">MISRA-C:2004 Compliance Exceptions </div>  </div>
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 113 <div class="contents">
 114 <div class="textblock"><p>CMSIS-CORE uses the common coding rules for CMSIS components that are documented under <a href="../../General/html/index.html"><b>Introduction</b></a>.</p>
 115 <p>CMSIS-CORE violates the following MISRA-C:2004 rules:</p>
 116 <ul>
 117 <li>Required Rule 8.5, object/function definition in header file.<br/>
 118  Violated since function definitions in header files are used for function inlining'.</li>
 119 <li>Advisory Rule 12.4, Side effects on right hand side of logical operator.<br/>
 120  Violated because volatile is used for core register definitions.</li>
 121 <li>Advisory Rule 14.7, Return statement before end of function.<br/>
 122  Violated to simplify code logic.</li>
 123 <li>Required Rule 18.4, declaration of union type or object of union type: '{...}'.<br/>
 124  Violated since unions are used for effective representation of core registers.</li>
 125 <li>Advisory Rule 19.4, Disallowed definition for macro.<br/>
 126  Violated since macros are used for assembler keywords.</li>
 127 <li>Advisory Rule 19.7, Function-like macro defined.<br/>
 128  Violated since function-like macros are used to generate more efficient code.</li>
 129 <li>Advisory Rule 19.16, all preprocessing directives must be valid.<br/>
 130  Violated to set default settings for macros.</li>
 131 </ul>
 132 <p>CMSIS-CORE violates the following MISRA-C:2012 rules:</p>
 133 <ul>
 134 <li>Directive 4.9, function-like macro defined.<br/>
 135  Violated since function-like macros are used to generate more efficient code.</li>
 136 <li>Rule 1.3, multiple use of '#/##' operators in macro definition.<br/>
 137  Violated since function-like macros are used to generate more efficient code.</li>
 138 <li>Rule 11.4, conversion between a pointer and integer type.<br/>
 139  Violated because of core register access.</li>
 140 <li>Rule 11.6, cast from unsigned long to pointer.<br/>
 141  Violated because of core register access.</li>
 142 <li>Rule 13.5, side effects on right hand side of logical operator.<br/>
 143  Violated because of shift operand is used in macros and functions.</li>
 144 <li>Rule 14.4, conditional expression should have essentially Boolean type.<br/>
 145  Violated since macros with several instructions are used.</li>
 146 <li>Rule 15.5, return statement before end of function.<br/>
 147  Violated to simplify code logic.</li>
 148 <li>Rule 20.10, '#/##' operators used.<br/>
 149  Violated since function-like macros are used to generate more efficient code.</li>
 150 <li>Rule 21.1, reserved to the compiler.<br/>
 151  Violated since macros with leading underscores are used.</li>
 152 </ul>
 153 <p>&lt;device&gt;.h files generated by <b>SVDConv.exe</b> violate the following MISRA-C:2004 rules:</p>
 154 <ul>
 155 <li>Advisory Rule 20.2, Re-use of C90 identifier pattern.<br/>
 156  Violated since CMSIS macros begin with '__'. Since CMSIS is developed and verified with various compilers this approach is acceptable and avoids conflicts with user symbols.</li>
 157 <li>Advisory Rule 19.1, Declaration before #include.<br/>
 158  Violated since Interrupt Number Definition Type (IRQn_Type) must be defined before including the core header file. </li>
 159 </ul>
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