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 $1"
  78
  79     # No need to parallelize Coccinelle since this mode takes one input file.
  80     NPROC=1
  81 else
  82     ONLINE=0
  83     if [ "$KBUILD_EXTMOD" = "" ] ; then
  84         OPTIONS="--dir $srctree $COCCIINCLUDE"
  85     else
  86         OPTIONS="--dir $KBUILD_EXTMOD $COCCIINCLUDE"
  87     fi
  88
  89     # Use only one thread per core by default if hyperthreading is enabled
  90     THREADS_PER_CORE=$(LANG=C lscpu | grep "Thread(s) per core: " | tr -cd "[:digit:]")
  91     if [ -z "$J" ]; then
  92         NPROC=$(getconf _NPROCESSORS_ONLN)
  93         if [ $THREADS_PER_CORE -gt 1 -a $NPROC -gt 4 ] ; then
  94                 NPROC=$((NPROC/2))
  95         fi
  96     else
  97         NPROC="$J"
  98     fi
  99 fi
 100
 101 if [ "$KBUILD_EXTMOD" != "" ] ; then
 102     OPTIONS="--patch $srctree $OPTIONS"
 103 fi
 104
 105 # You can override by using SPFLAGS
 106 if [ "$USE_JOBS" = "no" ]; then
 107         trap kill_running SIGTERM SIGINT
 108         declare -a SPATCH_PID
 109 elif [ "$NPROC" != "1" ]; then
 110         # Using 0 should work as well, refer to _SC_NPROCESSORS_ONLN use on
 111         # https://github.com/rdicosmo/parmap/blob/master/setcore_stubs.c
 112         OPTIONS="$OPTIONS --jobs $NPROC --chunksize 1"
 113 fi
 114
 115 if [ "$MODE" = "" ] ; then
 116     if [ "$ONLINE" = "0" ] ; then
 117         echo 'You have not explicitly specified the mode to use. Using default "report" mode.'
 118         echo 'Available modes are the following: patch, report, context, org, chain'
 119         echo 'You can specify the mode with "make coccicheck MODE=<mode>"'
 120         echo 'Note however that some modes are not implemented by some semantic patches.'
 121     fi
 122     MODE="report"
 123 fi
 124
 125 if [ "$MODE" = "chain" ] ; then
 126     if [ "$ONLINE" = "0" ] ; then
 127         echo 'You have selected the "chain" mode.'
 128         echo 'All available modes will be tried (in that order): patch, report, context, org'
 129     fi
 130 elif [ "$MODE" = "report" -o "$MODE" = "org" ] ; then
 131     FLAGS="--no-show-diff $FLAGS"
 132 fi
 133
 134 if [ "$ONLINE" = "0" ] ; then
 135     echo ''
 136     echo 'Please check for false positives in the output before submitting a patch.'
 137     echo 'When using "patch" mode, carefully review the patch before submitting it.'
 138     echo ''
 139 fi
 140
 141 run_cmd_parmap() {
 142         if [ $VERBOSE -ne 0 ] ; then
 143                 echo "Running ($NPROC in parallel): $@"
 144         fi
 145         if [ "$DEBUG_FILE" != "/dev/null" -a "$DEBUG_FILE" != "" ]; then
 146                 echo $@>>$DEBUG_FILE
 147                 $@ 2>>$DEBUG_FILE
 148         else
 149                 echo $@
 150                 $@ 2>&1
 151         fi
 152
 153         err=$?
 154         if [[ $err -ne 0 ]]; then
 155                 echo "coccicheck failed"
 156                 exit $err
 157         fi
 158 }
 159
 160 run_cmd_old() {
 161         local i
 162         if [ $VERBOSE -ne 0 ] ; then
 163                 echo "Running ($NPROC in parallel): $@"
 164         fi
 165         for i in $(seq 0 $(( NPROC - 1)) ); do
 166                 eval "$@ --max $NPROC --index $i &"
 167                 SPATCH_PID[$i]=$!
 168                 if [ $VERBOSE -eq 2 ] ; then
 169                         echo "${SPATCH_PID[$i]} running"
 170                 fi
 171         done
 172         wait
 173 }
 174
 175 run_cmd() {
 176         if [ "$USE_JOBS" = "yes" ]; then
 177                 run_cmd_parmap $@
 178         else
 179                 run_cmd_old $@
 180         fi
 181 }
 182
 183 kill_running() {
 184         for i in $(seq 0 $(( NPROC - 1 )) ); do
 185                 if [ $VERBOSE -eq 2 ] ; then
 186                         echo "Killing ${SPATCH_PID[$i]}"
 187                 fi
 188                 kill ${SPATCH_PID[$i]} 2>/dev/null
 189         done
 190 }
 191
 192 # You can override heuristics with SPFLAGS, these must always go last
 193 OPTIONS="$OPTIONS $SPFLAGS"
 194
 195 coccinelle () {
 196     COCCI="$1"
 197
 198     OPT=`grep "Options:" $COCCI | cut -d':' -f2`
 199     REQ=`grep "Requires:" $COCCI | cut -d':' -f2 | sed "s| ||"`
 200     if [ -n "$REQ" ] && ! { echo "$REQ"; echo "$SPATCH_VERSION"; } | sort -CV ; then
 201             echo "Skipping coccinelle SmPL patch: $COCCI"
 202             echo "You have coccinelle:           $SPATCH_VERSION"
 203             echo "This SmPL patch requires:      $REQ"
 204             return
 205     fi
 206
 207 #   The option '--parse-cocci' can be used to syntactically check the SmPL files.
 208 #
 209 #    $SPATCH -D $MODE $FLAGS -parse_cocci $COCCI $OPT > /dev/null
 210
 211     if [ $VERBOSE -ne 0 -a $ONLINE -eq 0 ] ; then
 212
 213         FILE=${COCCI#$srctree/}
 214
 215         echo "Processing `basename $COCCI`"
 216         echo "with option(s) \"$OPT\""
 217         echo ''
 218         echo 'Message example to submit a patch:'
 219
 220         sed -ne 's|^///||p' $COCCI
 221
 222         if [ "$MODE" = "patch" ] ; then
 223             echo ' The semantic patch that makes this change is available'
 224         elif [ "$MODE" = "report" ] ; then
 225             echo ' The semantic patch that makes this report is available'
 226         elif [ "$MODE" = "context" ] ; then
 227             echo ' The semantic patch that spots this code is available'
 228         elif [ "$MODE" = "org" ] ; then
 229             echo ' The semantic patch that makes this Org report is available'
 230         else
 231             echo ' The semantic patch that makes this output is available'
 232         fi
 233         echo " in $FILE."
 234         echo ''
 235         echo ' More information about semantic patching is available at'
 236         echo ' http://coccinelle.lip6.fr/'
 237         echo ''
 238
 239         if [ "`sed -ne 's|^//#||p' $COCCI`" ] ; then
 240             echo 'Semantic patch information:'
 241             sed -ne 's|^//#||p' $COCCI
 242             echo ''
 243         fi
 244     fi
 245
 246     if [ "$MODE" = "chain" ] ; then
 247         run_cmd $SPATCH -D patch   \
 248                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS               || \
 249         run_cmd $SPATCH -D report  \
 250                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS --no-show-diff || \
 251         run_cmd $SPATCH -D context \
 252                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS               || \
 253         run_cmd $SPATCH -D org     \
 254                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS --no-show-diff || exit 1
 255     elif [ "$MODE" = "rep+ctxt" ] ; then
 256         run_cmd $SPATCH -D report  \
 257                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS --no-show-diff && \
 258         run_cmd $SPATCH -D context \
 259                 $FLAGS --cocci-file $COCCI $OPT $OPTIONS || exit 1
 260     else
 261         run_cmd $SPATCH -D $MODE   $FLAGS --cocci-file $COCCI $OPT $OPTIONS || exit 1
 262     fi
 263
 264 }
 265
 266 if [ "$DEBUG_FILE" != "/dev/null" -a "$DEBUG_FILE" != "" ]; then
 267         if [ -f $DEBUG_FILE ]; then
 268                 echo "Debug file $DEBUG_FILE exists, bailing"
 269                 exit
 270         fi
 271 else
 272         DEBUG_FILE="/dev/null"
 273 fi
 274
 275 if [ "$COCCI" = "" ] ; then
 276     for f in `find $srctree/scripts/coccinelle/ -name '*.cocci' -type f | sort`; do
 277         coccinelle $f
 278     done
 279 else
 280     coccinelle $COCCI
 281 fi