121 lines
3.3 KiB
Plaintext
121 lines
3.3 KiB
Plaintext
$NetBSD: STYLE,v 1.5 2001/07/22 13:34:02 wiz Exp $
|
|
|
|
Style guide for NetBSD/alpha kernel files.
|
|
|
|
This file is meant to supplement the NetBSD KNF style guide (which covers
|
|
most of the rest of the system, and can be found in /usr/share/misc/style).
|
|
|
|
|
|
SECTIONS
|
|
|
|
* INCLUDE FILES
|
|
* RCS IDS
|
|
* COMPILATION FLAGS
|
|
* MACRO DEFINITIONS
|
|
* BLOCKS AND EXPRESSIONS
|
|
|
|
|
|
INCLUDE FILES
|
|
|
|
(1) All option headers should be included first, and sorted, like:
|
|
|
|
#include "opt_dec_3000_300.h"
|
|
#include "opt_dec_3000_500.h"
|
|
|
|
(2) All C sources should include <sys/cdefs.h> as the first header to
|
|
be included after any option headers, with a line like:
|
|
|
|
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
|
|
|
|
(3) Nothing should include <sys/conf.h> directly. Instead, <machine/conf.h>
|
|
should be included. It includes <sys/conf.h> and provides appropriate
|
|
definitions for the machine-dependent devices and macros used by the Alpha
|
|
port.
|
|
|
|
|
|
RCS IDS
|
|
|
|
(1) NetBSD RCS ID tags ($NetBSD: STYLE,v 1.5 2001/07/22 13:34:02 wiz Exp $ tags) in C sources and headers should
|
|
appear at the top of the file in a single-line comment of the form
|
|
|
|
/*<space>$NetBSD: STYLE,v 1.5 2001/07/22 13:34:02 wiz Exp $<space>*/
|
|
|
|
which differs from the normal NetBSD style, in that it uses spaces
|
|
rather than tabs to separate the tag from the comment start and end
|
|
delimiters.
|
|
|
|
(2) All C and assembler sources should include an RCS ID tag which can
|
|
be compiled into the binary, with a line like:
|
|
|
|
__KERNEL_RCSID(0, "$NetBSD: STYLE,v 1.5 2001/07/22 13:34:02 wiz Exp $");
|
|
|
|
after the inclusion of cdefs.h. Source files which include other source
|
|
files should change the number '0' to a different number, so that it
|
|
doesn't conflict with the RCS ID definitios in included sources.
|
|
Generation of these RCS IDs is disabled if the kernel option
|
|
NO_KERNEL_RCSIDS is defined. (In some cases, picking the number to use
|
|
may not be so straightforward, but the rule above usually works.)
|
|
|
|
|
|
COMPILATION FLAGS
|
|
|
|
By default, NetBSD/alpha kernel files are compiled with the following gcc
|
|
warning flags:
|
|
|
|
-Werror
|
|
-Wall
|
|
-Wstrict-prototypes
|
|
-Wmissing-prototypes
|
|
-Wno-format
|
|
|
|
NetBSD/alpha kernel code should compile cleanly with those flags. At some
|
|
point in the future (when the nonstandard extensions have been removed
|
|
from the kernel printf() function), -Wformat will be re-enabled, so sources
|
|
should be able to compile with it enabled as well.
|
|
|
|
|
|
MACRO DEFINITIONS
|
|
|
|
(1) Macros which use C blocks (i.e. are of the form "{ ... expressions
|
|
... }") should always be defined like:
|
|
|
|
#define MACRO(arg1, arg2, argN) \
|
|
do { \
|
|
... \
|
|
expressions \
|
|
... \
|
|
} while (0)
|
|
|
|
so that they behave like functions or macros which don't use blocks (e.g.
|
|
for the purpose of "if (foo) MACRO(); else ...").
|
|
|
|
|
|
BLOCKS AND EXPRESSIONS
|
|
|
|
(1) Surround blocks with { and } more often than is absolutely necessary.
|
|
For instance:
|
|
|
|
if (foo)
|
|
bar();
|
|
|
|
is acceptable, but:
|
|
|
|
if (foo) {
|
|
bar();
|
|
}
|
|
|
|
is preferred. (In contrast, NetBSD KNF says that no braces are to be
|
|
used for control statements with zero or one statements.)
|
|
|
|
(2) Use extra parentheses when it makes expressions clearer. For instance,
|
|
|
|
(foo == 10 && bar == 20)
|
|
|
|
is acceptable, but:
|
|
|
|
((foo == 10) && (bar == 20))
|
|
|
|
is preferred. (In contrast, NetBSD KNF says to avoid using parentheses
|
|
except where necessary unless the expression is very confusing without
|
|
them.)
|