#!/bin/sh
# This script finds miscompiled procedures.
#
# Given a stage2 directory that works (stage2.ok) and one that doesn't
# (stage2.bad), this script uses binary search to try to find in stage2.bad
# first the C source file and then the module within that C source file that
# when put together with everthing else from the stage2.ok directory, still
# causes the compiler to fail.
#
# If the bad C source file has different numbers of modules in the bad and ok
# versions, then the script stops after identifying only the file.
#
# The test for the composite stage2 compiler is either bootstrap checking
# (the default, or the successful execution of the all the test cases in
# one or more dubdirectories of the tests directory.

usage="\
Usage: $0 [options]
Options:
	-b, --no-bootcheck
		Do not perform a bootcheck; check only the tests directory.
	-c, --compile-only
		Compile only. Do not compare stage2.ok and stage3.
	-d <dirname>, --dir <dirname>
		Confine the search to one directory, library or compiler.
		(Usually useful only after a previous search.)
	-f <modulename>, --file <modulename>
		Confine the search to the named file(s).
		(Usually useful only after a previous search.)
	-h, --help
		Display this usage message.
	-j <num-jobs>, --jobs <num-jobs>
		Run using <num-jobs> different parallel processes.
	-m <mmake-args>, --mmake-args <mmake-args>
		Pass <mmake-args> as options to \`mmake'.
	-n, --negative-search
		Look for the module that suppresses the bug, not causes it.
	-o <filename>, --output-file <filename>
		Output results to <filename>.
	-r, --copy-runtime
		Copy the runtime directory instead of linking it.
		This is necessary if the test uses a compilation model option
		that differs from the one used in the main runtime directory.
	-t <testdir>, --test-dir <testdir>
		Execute runtests from the named subdirectory of tests.
"

set -x

bootcheck=""
compile_only=""
jfactor=
mmake_opts=""
outfile=""
copy_runtime=false
testdirs=""
negative=false
alldirs=""
allmodules=""

while [ $# -gt 0 ]; do
	case "$1" in

	-b|--no-bootcheck)
		bootcheck="-b" ;;

	-c|--compile-only)
		compile_only="-c" ;;

	-d|--dir)
		alldirs="$2"; shift ;;
	-d*)
		alldirs="` expr $1 : '-d\(.*\)' `"; ;;

	-f|--file)
		allmodules="$allmodules $2"; shift ;;
	-f*)
		allmodules="$allmodules ` expr $1 : '-f\(.*\)' `"; ;;

	-h|--help)
		echo "$usage"
		exit 0 ;;

	-j|--jobs)
		jfactor="-j$2"; shift ;;
	-j*)
		jfactor="-j` expr $1 : '-j\(.*\)' `" ;;
	--jobs*)
		jfactor="--jobs` expr $1 : '--jobs\(.*\)' `" ;;

	-m|--mmake)
		mmake_opts="$mmake_opts $2"; shift ;;

	-n|--negative-search)
		negative=true ;;

	-o|--output-file)
		outfile="-o $2"; shift ;;
	-o*)
		outfile="-o ` expr $1 : '-o\(.*\)' `"; ;;

	-r|--copy-runtime)
		copy_runtime=true ;;

	-t|--test-dir)
		testdirs="$testdirs -t$2"; shift ;;
	-t*)
		testdirs="$testdirs ` expr $1 : '-t\(.*\)' `" ;;

	-*)
		echo "$0: unknown option \`$1'" 1>&2
		echo "$usage" 1>&2
		exit 1 ;;

	*)
		echo "$usage" 1>&2
		exit 1 ;;
	esac
	shift
done

if test "$negative" = true
then
	base=bad
	trial=ok
	expected=failure
else
	base=ok
	trial=bad
	expected=success
fi

if test -d stage2.ok -a -d stage2.bad
then
	echo "stage2.ok and stage2.bad both present"
else
	echo "at least one of stage2.ok and stage2.bad is missing"
	exit 1
fi

echo "starting at `date`"

root=`/bin/pwd`
PATH=$root/tools:$PATH
export PATH

[ -d stage2 ] || mkdir stage2
/bin/rm -fr stage2/*
set +x
echo linking stage 2... 1>&2
cd stage2
mkdir compiler
cd compiler
ln -s $root/compiler/*.m .
cp $root/compiler/Mmake* .
cd $root/stage2
mkdir library
cd library
ln -s $root/library/*.m .
# ln -s $root/library/*.nl .
ln -s $root/library/library.init .
cp $root/library/Mmake* .
cd $root/stage2
if test "$copy_runtime" = "true"
then
	mkdir runtime
	cd runtime
	ln -s $root/runtime/*.h .
	ln -s $root/runtime/*.c .
	ln -s $root/runtime/*.mod .
	ln -s $root/runtime/*.in .
	ln -s $root/runtime/machdeps .
	cp $root/runtime/Mmake* .
	cd $root/stage2
else
	ln -s $root/runtime .
fi
ln -s $root/boehm_gc .
ln -s $root/doc .
ln -s $root/scripts .
ln -s $root/util .
ln -s $root/profiler .
ln -s $root/conf* .
rm -f config*.log
cp $root/stage2.ok/Mmake* .
cd $root

# We don't copy the .d files. This prevents mmake from trying to remake any
# of the .c and .o files, which we provide in the form they should be used.

# cp stage2.ok/library/*.d stage2/library
cp stage2.ok/library/*.dep stage2/library
cp stage2.ok/library/*.int stage2/library
cp stage2.ok/library/*.int2 stage2/library
cp stage2.ok/library/*.date stage2/library
# cp stage2.ok/compiler/*.d stage2/compiler
cp stage2.ok/compiler/*.dep stage2/compiler
cp stage2.ok/compiler/*.int stage2/compiler
cp stage2.ok/compiler/*.int2 stage2/compiler
cp stage2.ok/compiler/*.date stage2/compiler

set -x

if test "$copy_runtime" = "true"
then
	if (cd stage2 ; mmake $mmake_opts $jfactor runtime)
	then
		echo "building of stage 2 runtime successful"
	else
		echo "building of stage 2 runtime not successful"
		exit 1
	fi
fi

/bin/rm -f stage3/Mmake*
cp $root/stage2.ok/Mmake* stage3

if test "$alldirs" = ""
then
	echo testing whether the stage2.bad library works

	set +x
	echo linking stage2/library from stage2.bad/library 1>&2
	cp stage2.bad/library/*.[co] stage2/library
	echo linking stage2/compiler from stage2.ok/compiler 1>&2
	cp stage2.ok/compiler/*.[co] stage2/compiler
	set -x

	if test "$negative" = true
	then
		if binary_step $bootcheck $compile_only $jfactor -m "$mmake_opts" $outfile $testdirs
		then
			testeddir=library
		else
			testeddir=compiler
		fi
		echo "solution seems to be in the $testeddir directory"
	else
		if binary_step $bootcheck $compile_only $jfactor -m "$mmake_opts" $outfile $testdirs
		then
			testeddir=compiler
		else
			testeddir=library
		fi
		echo "problem seems to be in the $testeddir directory"
	fi
else
	testeddir=$alldirs
	if test ! -d stage2/$testeddir
	then
		echo $stage2/$testeddir does not exist
		exit 1
	fi
fi

# start out with all files in stage2 coming from stage2.$base

set +x
echo linking stage2 from stage2.$base 1>&2
cp stage2.$base/library/*.[co] stage2/library
cp stage2.$base/compiler/*.[co] stage2/compiler
set -x

# find the set of candidate modules

if test "$allmodules" = ""
then
	cd stage2/$testeddir
	allmodules=`sub X.c X *.c`
	cd $root
else
	for module in $allmodules
	do
		if test ! -f stage2/$testeddir/$module.c
		then
			echo $stage2/$testeddir/$module.c does not exist
			exit 1
		fi
	done
fi

doubtful="$allmodules"
tested=`half $doubtful`
knowngood=

while test "$tested" != ""
do
	# at this point, all the files in stage2 should be from stage2.$base

	echo "doubtful modules: $doubtful"
	echo "testing modules:  $tested"

	for module in $tested
	do
		cp stage2.$trial/$testeddir/$module.[co] stage2/$testeddir
	done

	if test "$negative" = true
	then
		if binary_step $bootcheck $compile_only $jfactor -m "$mmake_opts" $outfile $testdirs
		then
			echo "test succeeded"
			lasttest=success
			doubtful="$tested"
		else
			echo "test failed"
			lasttest=failure
			newdoubtful=""
			for module in $doubtful
			do
				if not appears $module $tested
				then
					newdoubtful="$newdoubtful $module"
				fi
			done
			doubtful="$newdoubtful"
		fi
	else
		if binary_step $bootcheck $compile_only $jfactor -m "$mmake_opts" $outfile $testdirs
		then
			echo "test succeeded"
			lasttest=success
			knowngood="$knowngood $tested"
			newdoubtful=""
			for module in $doubtful
			do
				if not appears $module $tested
				then
					newdoubtful="$newdoubtful $module"
				fi
			done
			doubtful="$newdoubtful"
		else
			echo "test failed"
			lasttest=failure
			doubtful="$tested"
		fi
	fi

	for module in $tested
	do
		cp stage2.$base/$testeddir/$module.[co] stage2/$testeddir
	done

	tested=`half $doubtful`
	if test "$tested" = "" -a "$lasttest" = "$expected"
	then
		tested="$doubtful"
	fi
done

if test "$doubtful" = ""
then
	echo "cannot find the problem; all modules behave as expected"
	exit 1
fi

module=`echo $doubtful | tr -d ' '`

if test "$negative" = false
then
	echo "the modules known to be ok are: $knowngood"
fi
echo "there is a problem in $testeddir/$module"
echo

basecnt=`egrep '^END_MODULE' stage2.$base/$testeddir/$module.c | wc -l`
trialcnt=`egrep '^END_MODULE' stage2.$trial/$testeddir/$module.c | wc -l`

if test $basecnt -ne $trialcnt
then
	basecnt=`echo $basecnt | tr -d ' '`
	trialcnt=`echo $trialcnt | tr -d ' '`

	echo "the two versions of the problem module"
	echo "differ in the number of C modules they have"
	echo "$base version: $basecnt vs $trial version: $trialcnt"
	exit 1
fi

for dir in $base $trial
do
	cd stage2.$dir/$testeddir
	divide $module.c $basecnt
	cd $root
done

doubtful=
i=0
while test $i -le $basecnt
do
	doubtful="$doubtful $i"
	i=`expr $i + 1`
done

tested=`half $doubtful`
knowngood=

while test "$tested" != ""
do
	echo "doubtful: $doubtful"
	echo "testing:  $tested"

	assemble $base $trial $testeddir $module $basecnt $tested
	cd stage2/$testeddir
	/bin/rm $module.o
	mmake $module.o
	cd $root

	if test "$negative" = true
	then
		if binary_step $bootcheck $compile_only $jfactor -m "$mmake_opts" $outfile $testdirs
		then
			echo "test succeeded"
			lasttest=success
			doubtful="$tested"
		else
			echo "test failed"
			lasttest=failure
			newdoubtful=""
			for part in $doubtful
			do
				if not appears $part $tested
				then
					newdoubtful="$newdoubtful $part"
				fi
			done
			doubtful="$newdoubtful"
		fi
	else
		if binary_step $bootcheck $compile_only $jfactor -m "$mmake_opts" $outfile $testdirs
		then
			echo "test succeeded"
			lasttest=success
			knowngood="$knowngood $tested"
			newdoubtful=""
			for part in $doubtful
			do
				if not appears $part $tested
				then
					newdoubtful="$newdoubtful $part"
				fi
			done
			doubtful="$newdoubtful"
		else
			echo "test failed"
			lasttest=failure
			doubtful="$tested"
		fi
	fi

	tested=`half $doubtful`
	if test "$tested" = "" -a "$lasttest" = "$expected"
	then
		tested="$doubtful"
	fi
done

if test "$doubtful" = ""
then
	echo "cannot find the problem; all parts behave as expected"
	exit 1
fi

doubtful=`echo $doubtful | tr -d ' '`

if test "$negative" = false
then
	echo "the parts known to be ok are: $knowngood"
fi
echo "there is a problem in $testeddir/$module.c.part.$doubtful"
echo "the difference is:"
echo

diff -u stage2.$base/$testeddir/$module.c.part.$doubtful stage2.$trial/$testeddir/$module.c.part.$doubtful

echo
echo "finishing at `date`"
exit 0