busybox/include
James Byrne 6937487be7 libbb: reduce the overhead of single parameter bb_error_msg() calls
Back in 2007, commit 0c97c9d437 ("'simple' error message functions by
Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower
overhead call to bb_perror_msg() when only a string was being printed
with no parameters. This saves space for some CPU architectures because
it avoids the overhead of a call to a variadic function. However there
has never been a simple version of bb_error_msg(), and since 2007 many
new calls to bb_perror_msg() have been added that only take a single
parameter and so could have been using bb_simple_perror_message().

This changeset introduces 'simple' versions of bb_info_msg(),
bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and
bb_herror_msg_and_die(), and replaces all calls that only take a
single parameter, or use something like ("%s", arg), with calls to the
corresponding 'simple' version.

Since it is likely that single parameter calls to the variadic functions
may be accidentally reintroduced in the future a new debugging config
option WARN_SIMPLE_MSG has been introduced. This uses some macro magic
which will cause any such calls to generate a warning, but this is
turned off by default to avoid use of the unpleasant macros in normal
circumstances.

This is a large changeset due to the number of calls that have been
replaced. The only files that contain changes other than simple
substitution of function calls are libbb.h, libbb/herror_msg.c,
libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c,
networking/udhcp/common.h and util-linux/mdev.c additonal macros have
been added for logging so that single parameter and multiple parameter
logging variants exist.

The amount of space saved varies considerably by architecture, and was
found to be as follows (for 'defconfig' using GCC 7.4):

Arm:     -92 bytes
MIPS:    -52 bytes
PPC:   -1836 bytes
x86_64: -938 bytes

Note that for the MIPS architecture only an exception had to be made
disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h)
because it made these files larger on MIPS.

Signed-off-by: James Byrne <james.byrne@origamienergy.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 11:35:03 +02:00
..
.gitignore ash: allow shell scripts to be embedded in the binary 2018-11-01 10:15:13 +01:00
applet_metadata.h applet_tables: do not include libbb.h, that header ir for target builds 2011-03-28 01:23:38 +02:00
applets.h.sh modprobe-small: make applets individually selectable 2016-12-23 15:13:16 +01:00
applets.src.h Tweaks to build process for embedded scripts 2018-11-27 10:38:10 +01:00
ar.h *: make GNU licensing statement forms more regular 2010-08-16 20:14:46 +02:00
bb_archive.h libarchive: treat one "FIXME: avoid seek" 2019-05-24 17:03:28 +02:00
bb_e2fs_defs.h Whitespace fixes 2013-07-30 11:52:58 +02:00
busybox.h config: disentangle PREFER_APPLETS from SH_STANDALONE and SH_NOFORK 2016-07-22 18:48:38 +02:00
dump.h *: whitespace fixes 2010-10-28 18:57:19 +02:00
fix_u32.h *: make GNU licensing statement forms more regular 2010-08-16 20:14:46 +02:00
grp_.h libpwdgrp: use FAST_FUNC to make "matching ABI" optimization more likely to succeed 2015-01-02 22:31:07 +01:00
inet_common.h
libbb.h libbb: reduce the overhead of single parameter bb_error_msg() calls 2019-07-02 11:35:03 +02:00
liblzo_interface.h lzop: code shrink 2018-02-01 01:41:31 +01:00
platform.h tls: code shrink 2018-11-23 18:48:20 +01:00
pwd_.h libpwdgrp: use getpwent() instead of getpwent_r() 2015-02-07 21:21:02 +01:00
rtc_.h whitespace cleanup 2010-10-29 11:46:52 +02:00
shadow_.h libpwdgrp: use FAST_FUNC to make "matching ABI" optimization more likely to succeed 2015-01-02 22:31:07 +01:00
unicode.h ash,hush: recheck LANG before every line input 2011-03-23 17:59:27 +01:00
usage.src.h Tweaks to build process for embedded scripts 2018-11-27 10:38:10 +01:00
volume_id.h blkid: if parameters are given, do not scan /dev 2012-03-03 15:09:07 +01:00
xatonum.h udhcp: finish support of classless static routes 2011-12-16 17:05:52 +01:00
xregex.h *: make GNU licensing statement forms more regular 2010-08-16 20:14:46 +02:00