[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v3] docs/misra: new rules addition
From: Stefano Stabellini <stefano.stabellini@xxxxxxx> For Dir 1.1, a document describing all implementation-defined behaviour (i.e. gcc-specific behavior) will be added to docs/misra, also including implementation-specific (gcc-specific) appropriate types for bit-field relevant to Rule 6.1. Rule 21.21 is lacking an example on gitlab but the rule is straightforward: we don't use stdlib at all in Xen. Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx> --- Changes in v3: - add all signed integer types to the Notes of 6.1 - clarify 7.2 in the Notes - not added: marking "inapplicable" rules, to be a separate patch Changes in v2: - drop 5.6 - specify additional appropriate types for 6.1 --- docs/misra/rules.rst | 51 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/docs/misra/rules.rst b/docs/misra/rules.rst index d5a6ee8cb6..f72a49c9c4 100644 --- a/docs/misra/rules.rst +++ b/docs/misra/rules.rst @@ -40,6 +40,12 @@ existing codebase are work-in-progress. - Summary - Notes + * - `Dir 1.1 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/D_01_01.c>`_ + - Required + - Any implementation-defined behaviour on which the output of the + program depends shall be documented and understood + - + * - `Dir 2.1 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/D_02_01.c>`_ - Required - All source files shall compile without any compilation errors @@ -57,6 +63,13 @@ existing codebase are work-in-progress. header file being included more than once - + * - `Dir 4.11 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/D_04_11.c>`_ + - Required + - The validity of values passed to library functions shall be checked + - We do not have libraries in Xen (libfdt and others are not + considered libraries from MISRA C point of view as they are + imported in source form) + * - `Dir 4.14 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/D_04_14.c>`_ - Required - The validity of values received from external sources shall be @@ -133,6 +146,13 @@ existing codebase are work-in-progress. headers (xen/include/public/) are allowed to retain longer identifiers for backward compatibility. + * - `Rule 6.1 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_06_01.c>`_ + - Required + - Bit-fields shall only be declared with an appropriate type + - In addition to the C99 types, we also consider appropriate types: + unsigned char, unsigned short, unsigned long, unsigned long long, + enum, and all explicitly signed integer types. + * - `Rule 6.2 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_06_02.c>`_ - Required - Single-bit named bit fields shall not be of a signed type @@ -143,6 +163,32 @@ existing codebase are work-in-progress. - Octal constants shall not be used - + * - `Rule 7.2 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_07_02.c>`_ + - Required + - A "u" or "U" suffix shall be applied to all integer constants + that are represented in an unsigned type + - The rule asks that any integer literal that is implicitly + unsigned is made explicitly unsigned by using one of the + indicated suffixes. As an example, on a machine where the int + type is 32-bit wide, 0x77777777 is signed whereas 0x80000000 is + (implicitly) unsigned. In order to comply with the rule, the + latter should be rewritten as either 0x80000000u or 0x80000000U. + Consistency considerations may suggest using the same suffix even + when not required by the rule. For instance, if one has: + + Original: f(0x77777777); f(0x80000000); + + one might prefer + + Solution 1: f(0x77777777U); f(0x80000000U); + + over + + Solution 2: f(0x77777777); f(0x80000000U); + + after having ascertained that "Solution 1" is compatible with the + intended semantics. + * - `Rule 7.3 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_07_03.c>`_ - Required - The lowercase character l shall not be used in a literal suffix @@ -314,6 +360,11 @@ existing codebase are work-in-progress. used following a subsequent call to the same function - + * - Rule 21.21 + - Required + - The Standard Library function system of <stdlib.h> shall not be used + - + * - `Rule 22.2 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_22_02.c>`_ - Mandatory - A block of memory shall only be freed if it was allocated by means of a -- 2.25.1
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