linux-yocto/scripts/coccicheck

#!/usr/bin/env bash

SPDX-License-Identifier: GPL-2.0

Linux kernel coccicheck

Read Documentation/dev-tools/coccinelle.rst

This script requires at least spatch

version 1.0.0-rc11.

DIR="$(dirname $(readlink -f $0))/.." SPATCH="which ${SPATCH:=spatch}"

if [ ! -x "$SPATCH" ]; then echo 'spatch is part of the Coccinelle project and is available at http://coccinelle.lip6.fr/' exit 1 fi

SPATCH_VERSION=$($SPATCH --version | head -1 | awk '{print $3}')

USE_JOBS="no" $SPATCH --help | grep -e "--jobs" > /dev/null && USE_JOBS="yes"

The verbosity may be set by the environmental parameter V=

as for example with 'make V=1 coccicheck'

if [ -n "$V" -a "$V" != "0" ]; then VERBOSE="$V" else VERBOSE=0 fi

FLAGS="--very-quiet"

You can use SPFLAGS to append extra arguments to coccicheck or override any

heuristics done in this file as Coccinelle accepts the last options when

options conflict.

A good example for use of SPFLAGS is if you want to debug your cocci script,

you can for instance use the following:

$ export COCCI=scripts/coccinelle/misc/irqf_oneshot.cocci

$ make coccicheck MODE=report DEBUG_FILE="all.err" SPFLAGS="--profile --show-trying" M=./drivers/mfd/arizona-irq.c

"--show-trying" should show you what rule is being processed as it goes to

stdout, you do not need a debug file for that. The profile output will be

be sent to stdout, if you provide a DEBUG_FILE the profiling data can be

inspected there.

--profile will not output if --very-quiet is used, so avoid it.

echo $SPFLAGS | grep -E -e "--profile|--show-trying" 2>&1 > /dev/null if [ $? -eq 0 ]; then FLAGS="--quiet" fi

spatch only allows include directories with the syntax "-I include"

while gcc also allows "-Iinclude" and "-include include"

COCCIINCLUDE=${LINUXINCLUDE//-I/-I } COCCIINCLUDE=${COCCIINCLUDE// -include/ --include}

if [ "$C" = "1" -o "$C" = "2" ]; then ONLINE=1

if [[ $# -le 0 ]]; then
    echo ''
    echo 'Specifying both the variable "C" and rule "coccicheck" in the make

command results in a shift count error.' echo '' echo 'Try specifying "scripts/coccicheck" as a value for the CHECK variable instead.' echo '' echo 'Example: make C=2 CHECK=scripts/coccicheck drivers/net/ethernet/ethoc.o' echo '' exit 1 fi

# Take only the last argument, which is the C file to test
shift $(( $# - 1 ))
OPTIONS="$COCCIINCLUDE $1"

# No need to parallelize Coccinelle since this mode takes one input file.
NPROC=1

else ONLINE=0 OPTIONS="--dir $srcroot $COCCIINCLUDE"

# Use only one thread per core by default if hyperthreading is enabled
THREADS_PER_CORE=$(LANG=C lscpu | grep "Thread(s) per core: " | tr -cd "[:digit:]")
if [ -z "$J" ]; then
    NPROC=$(getconf _NPROCESSORS_ONLN)
if [ $THREADS_PER_CORE -gt 1 -a $NPROC -gt 4 ] ; then
	NPROC=$((NPROC/2))
fi
else
    NPROC="$J"
fi

fi

if [ "$KBUILD_EXTMOD" != "" ] ; then OPTIONS="--patch $srctree $OPTIONS" fi

You can override by using SPFLAGS

if [ "$USE_JOBS" = "no" ]; then trap kill_running SIGTERM SIGINT declare -a SPATCH_PID elif [ "$NPROC" != "1" ]; then # Using 0 should work as well, refer to _SC_NPROCESSORS_ONLN use on # https://github.com/rdicosmo/parmap/blob/master/setcore_stubs.c OPTIONS="$OPTIONS --jobs $NPROC --chunksize 1" fi

if [ "$MODE" = "" ] ; then if [ "$ONLINE" = "0" ] ; then echo 'You have not explicitly specified the mode to use. Using default "report" mode.' echo 'Available modes are the following: patch, report, context, org, chain' echo 'You can specify the mode with "make coccicheck MODE="' echo 'Note however that some modes are not implemented by some semantic patches.' fi MODE="report" fi

if [ "$MODE" = "chain" ] ; then if [ "$ONLINE" = "0" ] ; then echo 'You have selected the "chain" mode.' echo 'All available modes will be tried (in that order): patch, report, context, org' fi elif [ "$MODE" = "report" -o "$MODE" = "org" ] ; then FLAGS="--no-show-diff $FLAGS" fi

if [ "$ONLINE" = "0" ] ; then echo '' echo 'Please check for false positives in the output before submitting a patch.' echo 'When using "patch" mode, carefully review the patch before submitting it.' echo '' fi

run_cmd_parmap() { if [ $VERBOSE -ne 0 ] ; then echo "Running ($NPROC in parallel): $@" fi if [ "$DEBUG_FILE" != "/dev/null" -a "$DEBUG_FILE" != "" ]; then echo $@>>$DEBUG_FILE $@ 2>>$DEBUG_FILE else echo $@ $@ 2>&1 fi

err=$?
if [[ $err -ne 0 ]]; then
	echo "coccicheck failed"
	exit $err
fi

}

run_cmd_old() { local i if [ $VERBOSE -ne 0 ] ; then echo "Running ($NPROC in parallel): $@" fi for i in $(seq 0 $(( NPROC - 1)) ); do eval "$@ --max $NPROC --index $i &" SPATCH_PID[i]=! if [ $VERBOSE -eq 2 ] ; then echo "${SPATCH_PID[$i]} running" fi done wait }

run_cmd() { if [ "$USE_JOBS" = "yes" ]; then run_cmd_parmap $@ else run_cmd_old $@ fi }

kill_running() { for i in $(seq 0 $(( NPROC - 1 )) ); do if [ $VERBOSE -eq 2 ] ; then echo "Killing ${SPATCH_PID[$i]}" fi kill ${SPATCH_PID[$i]} 2>/dev/null done }

You can override heuristics with SPFLAGS, these must always go last

OPTIONS="$OPTIONS $SPFLAGS"

coccinelle () { COCCI="$1"

OPT=`grep "Options:" $COCCI | cut -d':' -f2`
REQ=`grep "Requires:" $COCCI | cut -d':' -f2 | sed "s| ||"`
if [ -n "$REQ" ] && ! { echo "$REQ"; echo "$SPATCH_VERSION"; } | sort -CV ; then
    echo "Skipping coccinelle SmPL patch: $COCCI"
    echo "You have coccinelle:           $SPATCH_VERSION"
    echo "This SmPL patch requires:      $REQ"
    return
fi

The option '--parse-cocci' can be used to syntactically check the SmPL files.

$SPATCH -D $MODE $FLAGS -parse_cocci $COCCI $OPT > /dev/null

if [ $VERBOSE -ne 0 -a $ONLINE -eq 0 ] ; then

FILE=${COCCI#$srctree/}

echo "Processing `basename $COCCI`"
echo "with option(s) \"$OPT\""
echo ''
echo 'Message example to submit a patch:'

sed -ne 's|^///||p' $COCCI

if [ "$MODE" = "patch" ] ; then
    echo ' The semantic patch that makes this change is available'
elif [ "$MODE" = "report" ] ; then
    echo ' The semantic patch that makes this report is available'
elif [ "$MODE" = "context" ] ; then
    echo ' The semantic patch that spots this code is available'
elif [ "$MODE" = "org" ] ; then
    echo ' The semantic patch that makes this Org report is available'
else
    echo ' The semantic patch that makes this output is available'
fi
echo " in $FILE."
echo ''
echo ' More information about semantic patching is available at'
echo ' http://coccinelle.lip6.fr/'
echo ''

if [ "`sed -ne 's|^//#||p' $COCCI`" ] ; then
    echo 'Semantic patch information:'
    sed -ne 's|^//#||p' $COCCI
    echo ''
fi
fi

if [ "$MODE" = "chain" ] ; then
run_cmd $SPATCH -D patch   \
	$FLAGS --cocci-file $COCCI $OPT $OPTIONS               || \
run_cmd $SPATCH -D report  \
	$FLAGS --cocci-file $COCCI $OPT $OPTIONS --no-show-diff || \
run_cmd $SPATCH -D context \
	$FLAGS --cocci-file $COCCI $OPT $OPTIONS               || \
run_cmd $SPATCH -D org     \
	$FLAGS --cocci-file $COCCI $OPT $OPTIONS --no-show-diff || exit 1
elif [ "$MODE" = "rep+ctxt" ] ; then
run_cmd $SPATCH -D report  \
	$FLAGS --cocci-file $COCCI $OPT $OPTIONS --no-show-diff && \
run_cmd $SPATCH -D context \
	$FLAGS --cocci-file $COCCI $OPT $OPTIONS || exit 1
else
run_cmd $SPATCH -D $MODE   $FLAGS --cocci-file $COCCI $OPT $OPTIONS || exit 1
fi

}

if [ "$DEBUG_FILE" != "/dev/null" -a "$DEBUG_FILE" != "" ]; then if [ -f $DEBUG_FILE ]; then echo "Debug file $DEBUG_FILE exists, bailing" exit fi else DEBUG_FILE="/dev/null" fi

if [ "$COCCI" = "" ] ; then for f in find $srctree/scripts/coccinelle/ -name '*.cocci' -type f | sort; do coccinelle $f done else coccinelle $COCCI fi