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doc: add some rules related to function documentation

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This patch adds some rules related to function documentation.

Tracked-On: #1844
Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>
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Shiqing Gao 2019-03-27 16:08:05 +08:00 committed by David Kinder
parent e8dda1e914
commit 1da23415a9
1 changed files with 94 additions and 0 deletions
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doc/developer-guides/coding_guidelines.rst
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@ -3141,6 +3141,100 @@ Compliant example::
// This is a comment
CS-18: Function information shall be documented with doxygen-style comments
===========================================================================
Some detailed rules are listed below to illustrate the comments format for each
function:
1) The comments block shall start with '/\*\*' (slash-asterisk-asterisk) in a
single line.
2) The comments block shall end with ' \*/' (space-asterisk-slash) in a single
line.
3) Other than the first line and the last line, every line inside the comments
block shall start with ' \*' (space-asterisk). It also applies to the line which
is used to separate different paragraphs. We'll call it a blank line for
simplicity.
4) For each function, the information shall be documented with the following
order: brief description, detailed description, parameters description,
pre-conditions, post-conditions, return value description, and comments
explaining the actual return values. We'll call each block of information a
paragraph for simplicity. A paragraph may be removed from the list if it is not
applicable for that function.
5) Each line shall only contain the description for one parameter, or one
pre-condition, or one post-condition, or one actual return value. We'll call
each of these an element for simplicity.
6) A blank line shall separate different paragraphs. Inside each paragraph, a
blank line is not required to separate each element.
7) The brief description of the function shall be documented with the format
'@brief <brief description>'.
8) No specific format is required for the detailed description of the function.
9) The description of the function parameter shall be documented with the format
'@param <parameter name> <parameter description>'.
10) The pre-condition of the function shall be documented with the format '@pre
<pre-condition description>'.
11) The post-condition of the function shall be documented with the format
'@post <post-condition description>'.
12) The brief description of the function return value shall be documented with
the format '@return <brief description of return value>'.
13) A void-returning function shall be documented with the format '@return
None'.
14) The comments explaining the actual return values shall be documented with
the format '@retval <return value> <return value explanation>'.
15) If the description of one element needs to span multiple lines, each line
shall be aligned to the start of the description in the first line for that
element.
16) The comments block shall appear immediately before the function
definition/declaration in the C source file or header file.
Compliant example::
/**
* @brief Brief description of the function.
*
* Detailed description of the function. Detailed description of the function. Detailed description of the
* function. Detailed description of the function.
*
* @param param_1 Parameter description for param_1.
* @param param_2 Parameter description for param_2.
* @param param_3 Parameter description for param_3. Parameter description for param_3. Parameter description
* for param_3. Parameter description for param_3. Parameter description for param_3. Parameter
* description for param_3.
*
* @pre param_1 != NULL
* @pre param_2 <= 255U
*
* @post retval <= 0
*
* @return Brief description of the return value.
*
* @retval 0 Success to handle specific case.
* @retval -EINVAL Fail to handle specific case because the argument is invalid.
* @retval -EBUSY Fail to handle specific case because the target is busy.
*
*/
int32_t func_showcase(uint32_t *param_1, uint32_t param_2, uint32_t param_3);
.. rst-class:: non-compliant-code
Non-compliant example::
/* Brief description of the function.
Detailed description of the function. Detailed description of the function. Detailed description of the
function. Detailed description of the function.
@param param_1 Parameter description for param_1. @param param_2 Parameter description for param_2.
@param param_3 Parameter description for param_3. Parameter description for param_3. Parameter description
for param_3. Parameter description for param_3. Parameter description for param_3. Parameter
description for param_3.
pre-conditions: param_1 != NULL, param_2 <= 255U
post-conditions: retval <= 0
Brief description of the return value. */
int32_t func_showcase(uint32_t *param_1, uint32_t param_2, uint32_t param_3);
Naming Convention
*****************