#!/bin/bash

  #
  # This script requires at least spatch
  # version 1.0.0-rc11.
  #

  SPATCH="`which ${SPATCH:=spatch}`"

  trap kill_running SIGTERM SIGINT
  declare -a SPATCH_PID

  # 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

  if [ -z "$J" ]; then
  	NPROC=$(getconf _NPROCESSORS_ONLN)
  else
  	NPROC="$J"
  fi

  FLAGS="$SPFLAGS --very-quiet"

  
  # 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/-I}

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

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

  else
      ONLINE=0

      if [ "$KBUILD_EXTMOD" = "" ] ; then

          OPTIONS="--dir $srctree $COCCIINCLUDE"

      else

          OPTIONS="--dir $KBUILD_EXTMOD $COCCIINCLUDE"

      fi

  fi

  if [ "$KBUILD_EXTMOD" != "" ] ; then

      OPTIONS="--patch $srctree $OPTIONS"

  fi

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

  	echo 'You can specify the mode with "make coccicheck MODE=<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="$FLAGS --no-show-diff"

  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() {

  	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

  }

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

  coccinelle () {

      COCCI="$1"

  
      OPT=`grep "Option" $COCCI | cut -d':' -f2`

  #   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=`echo $COCCI | sed "s|$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 [ "$COCCI" = "" ] ; then
      for f in `find $srctree/scripts/coccinelle/ -name '*.cocci' -type f | sort`; do

  	coccinelle $f

      done
  else

      coccinelle $COCCI

  fi