scripts/coccicheck

   1 #!/usr/bin/env bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Linux kernel coccicheck
   4 #
   5 # Read Documentation/dev-tools/coccinelle.rst
   6 #
   7 # This script requires at least spatch
   8 # version 1.0.0-rc11.
   9
  10 DIR="$(dirname $(readlink -f $0))/.."
  11 SPATCH="`which ${SPATCH:=spatch}`"
  12
  13 if [ ! -x "$SPATCH" ]; then
  14     echo 'spatch is part of the Coccinelle project and is available at http://coccinelle.lip6.fr/'
  15     exit 1
  16 fi
  17
  18 SPATCH_VERSION=$($SPATCH --version | head -1 | awk '{print $3}')
  19
  20 USE_JOBS="no"
  21 $SPATCH --help | grep -e "--jobs" > /dev/null && USE_JOBS="yes"
  22
  23 # The verbosity may be set by the environmental parameter V=
  24 # as for example with 'make V=1 coccicheck'
  25
  26 if [ -n "$V" -a "$V" != "0" ]; then
  27         VERBOSE="$V"
  28 else
  29         VERBOSE=0
  30 fi
  31
  32 FLAGS="--very-quiet"
  33
  34 # You can use SPFLAGS to append extra arguments to coccicheck or override any
  35 # heuristics done in this file as Coccinelle accepts the last options when
  36 # options conflict.
  37 #
  38 # A good example for use of SPFLAGS is if you want to debug your cocci script,
  39 # you can for instance use the following:
  40 #
  41 # $ export COCCI=scripts/coccinelle/misc/irqf_oneshot.cocci
  42 # $ make coccicheck MODE=report DEBUG_FILE="all.err" SPFLAGS="--profile --show-trying" M=./drivers/mfd/arizona-irq.c
  43 #
  44 # "--show-trying" should show you what rule is being processed as it goes to
  45 # stdout, you do not need a debug file for that. The profile output will be
  46 # be sent to stdout, if you provide a DEBUG_FILE the profiling data can be
  47 # inspected there.
  48 #
  49 # --profile will not output if --very-quiet is used, so avoid it.
  50 echo $SPFLAGS | grep -E -e "--profile|--show-trying" 2>&1 > /dev/null
  51 if [ $? -eq 0 ]; then
  52         FLAGS="--quiet"
  53 fi
  54
  55 # spatch only allows include directories with the syntax "-I include"
  56 # while gcc also allows "-Iinclude" and "-include include"
  57 COCCIINCLUDE=${LINUXINCLUDE//-I/-I }
  58 COCCIINCLUDE=${COCCIINCLUDE// -include/ --include}
  59
  60 if [ "$C" = "1" -o "$C" = "2" ]; then
  61     ONLINE=1
  62
  63     if [[ $# -le 0 ]]; then
  64             echo ''
  65             echo 'Specifying both the variable "C" and rule "coccicheck" in the make
  66 command results in a shift count error.'
  67             echo ''
  68             echo 'Try specifying "scripts/coccicheck" as a value for the CHECK variable instead.'
  69             echo ''
  70             echo 'Example:      make C=2 CHECK=scripts/coccicheck drivers/net/ethernet/ethoc.o'
  71             echo ''
  72             exit 1
  73     fi
  74
  75     # Take only the last argument, which is the C file to test
  76     shift $(( $# - 1 ))
  77     OPTIONS="$COCCIINCLUDE $1"
  78
  79     # No need to parallelize Coccinelle since this mode takes one input file.
  80     NPROC=1
  81 else
  82     ONLINE=0
  83     OPTIONS="--dir $srcroot $COCCIINCLUDE"
  84
  85     # Use only one thread per core by default if hyperthreading is enabled
  86     THREADS_PER_CORE=$(LANG=C lscpu | grep "Thread(s) per core: " | tr -cd "[:digit:]")
  87     if [ -z "$J" ]; then
  88         NPROC=$(getconf _NPROCESSORS_ONLN)
  89         if [ $THREADS_PER_CORE -gt 1 -a $NPROC -gt 4 ] ; then
  90                 NPROC=$((NPROC/2))
  91         fi
  92     else
  93         NPROC="$J"
  94     fi
  95 fi
  96
  97 if [ "$KBUILD_EXTMOD" != "" ] ; then
  98     OPTIONS="--patch $srctree $OPTIONS"
  99 fi
 100
 101 # You can override by using SPFLAGS
 102 if [ "$USE_JOBS" = "no" ]; then
 103         trap kill_running SIGTERM SIGINT
 104         declare -a SPATCH_PID
 105 elif [ "$NPROC" != "1" ]; then
 106         # Using 0 should work as well, refer to _SC_NPROCESSORS_ONLN use on
 107         # https://github.com/rdicosmo/parmap/blob/master/setcore_stubs.c
 108         OPTIONS="$OPTIONS --jobs $NPROC --chunksize 1"
 109 fi
 110
 111 if [ "$MODE" = "" ] ; then
 112     if [ "$ONLINE" = "0" ] ; then
 113         echo 'You have not explicitly specified the mode to use. Using default "report" mode.'
 114         echo 'Available modes are the following: patch, report, context, org, chain'
 115         echo 'You can specify the mode with "make coccicheck MODE=<mode>"'
 116         echo 'Note however that some modes are not implemented by some semantic patches.'
 117     fi
 118     MODE="report"
 119 fi
 120
 121 if [ "$MODE" = "chain" ] ; then
 122     if [ "$ONLINE" = "0" ] ; then
 123         echo 'You have selected the "chain" mode.'
 124         echo 'All available modes will be tried (in that order): patch, report, context, org'
 125     fi
 126 elif [ "$MODE" = "report" -o "$MODE" = "org" ] ; then
 127     FLAGS="--no-show-diff $FLAGS"
 128 fi
 129
 130 if [ "$ONLINE" = "0" ] ; then
 131     echo ''
 132     echo 'Please check for false positives in the output before submitting a patch.'
 133     echo 'When using "patch" mode, carefully review the patch before submitting it.'
 134     echo ''
 135 fi
 136
 137 run_cmd_parmap() {
 138         if [ $VERBOSE -ne 0 ] ; then
 139                 echo "Running ($NPROC in parallel): $@"
 140         fi
 141         if [ "$DEBUG_FILE" != "/dev/null" -a "$DEBUG_FILE" != "" ]; then
 142                 echo $@>>$DEBUG_FILE
 143                 $@ 2>>$DEBUG_FILE
 144         else
 145                 echo $@
 146                 $@ 2>&1
 147         fi
 148
 149         err=$?
 150         if [[ $err -ne 0 ]]; then
 151                 echo "coccicheck failed"
 152                 exit $err
 153         fi
 154 }
 155
 156 run_cmd_old() {
 157         local i
 158         if [ $VERBOSE -ne 0 ] ; then
 159                 echo "Running ($NPROC in parallel): $@"
 160         fi
 161         for i in $(seq 0 $(( NPROC - 1)) ); do
 162                 eval "$@ --max $NPROC --index $i &"
 163                 SPATCH_PID[$i]=$!
 164                 if [ $VERBOSE -eq 2 ] ; then
 165                         echo "${SPATCH_PID[$i]} running"
 166                 fi
 167         done
 168         wait
 169 }
 170
 171 run_cmd() {
 172         if [ "$USE_JOBS" = "yes" ]; then
 173                 run_cmd_parmap $@
 174         else
 175                 run_cmd_old $@
 176         fi
 177 }
 178
 179 kill_running() {
 180         for i in $(seq 0 $(( NPROC - 1 )) ); do
 181                 if [ $VERBOSE -eq 2 ] ; then
 182                         echo "Killing ${SPATCH_PID[$i]}"
 183                 fi
 184                 kill ${SPATCH_PID[$i]} 2>/dev/null
 185         done
 186 }
 187
 188 # You can override heuristics with SPFLAGS, these must always go last
 189 OPTIONS="$OPTIONS $SPFLAGS"
 190
 191 coccinelle () {
 192     COCCI="$1"
 193
 194     OPT=`grep "Options:" $COCCI | cut -d':' -f2`
 195     REQ=`grep "Requires:" $COCCI | cut -d':' -f2 | sed "s| ||"`
 196     if [ -n "$REQ" ] && ! { echo "$REQ"; echo "$SPATCH_VERSION"; } | sort -CV ; then
 197             echo "Skipping coccinelle SmPL patch: $COCCI"
 198             echo "You have coccinelle:           $SPATCH_VERSION"
 199             echo "This SmPL patch requires:      $REQ"
 200             return
 201     fi
 202
 203 #   The option '--parse-cocci' can be used to syntactically check the SmPL files.
 204 #
 205 #    $SPATCH -D $MODE $FLAGS -parse_cocci $COCCI $OPT > /dev/null
 206
 207     if [ $VERBOSE -ne 0 -a $ONLINE -eq 0 ] ; then
 208
 209         FILE=${COCCI#$srctree/}
 210
 211         echo "Processing `basename $COCCI`"
 212         echo "with option(s) \"$OPT\""
 213         echo ''
 214         echo 'Message example to submit a patch:'
 215
 216         sed -ne 's|^///||p' $COCCI
 217
 218         if [ "$MODE" = "patch" ] ; then
 219             echo ' The semantic patch that makes this change is available'
 220         elif [ "$MODE" = "report" ] ; then
 221             echo ' The semantic patch that makes this report is available'
 222         elif [ "$MODE" = "context" ] ; then
 223             echo ' The semantic patch that spots this code is available'
 224         elif [ "$MODE" = "org" ] ; then
 225             echo ' The semantic patch that makes this Org report is available'
 226         else
 227             echo ' The semantic patch that makes this output is available'
 228         fi
 229         echo " in $FILE."
 230         echo ''
 231         echo ' More information about semantic patching is available at'
 232         echo ' http://coccinelle.lip6.fr/'
 233         echo ''
 234
 235         if [ "`sed -ne 's|^//#||p' $COCCI`" ] ; then
 236             echo 'Semantic patch information:'
 237             sed -ne 's|^//#||p' $COCCI
 238             echo ''
 239         fi
 240     fi
 241
 242     if [ "$MODE" = "chain" ] ; then
 243         run_cmd $SPATCH -D patch   \
 244                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS               || \
 245         run_cmd $SPATCH -D report  \
 246                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS --no-show-diff || \
 247         run_cmd $SPATCH -D context \
 248                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS               || \
 249         run_cmd $SPATCH -D org     \
 250                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS --no-show-diff || exit 1
 251     elif [ "$MODE" = "rep+ctxt" ] ; then
 252         run_cmd $SPATCH -D report  \
 253                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS --no-show-diff && \
 254         run_cmd $SPATCH -D context \
 255                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS || exit 1
 256     else
 257         run_cmd $SPATCH -D $MODE   $FLAGS --cocci-file $COCCI $OPT $OPTIONS || exit 1
 258     fi
 259
 260 }
 261
 262 if [ "$DEBUG_FILE" != "/dev/null" -a "$DEBUG_FILE" != "" ]; then
 263         if [ -f $DEBUG_FILE ]; then
 264                 echo "Debug file $DEBUG_FILE exists, bailing"
 265                 exit
 266         fi
 267 else
 268         DEBUG_FILE="/dev/null"
 269 fi
 270
 271 if [ "$COCCI" = "" ] ; then
 272     for f in `find $srctree/scripts/coccinelle/ -name '*.cocci' -type f | sort`; do
 273         coccinelle $f
 274     done
 275 else
 276     coccinelle $COCCI
 277 fi