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#!/bin/sh

set -e

show_help () {
    cat <<EOF
Usage: $0 [FLAGS]...

Validate GHC source tree against testsuite; see
http://ghc.haskell.org/trac/ghc/wiki/TestingPatches for more
information.

Flags:
  --no-clean        don't make clean first, just carry on from
                    a previous interrupted validation run
  --testsuite-only  don't build the compiler, just run the test suite
  --hpc             build stage2 with -fhpc, and see how much of the
                    compiler the test suite covers.
                    2008-07-01: 63% slower than the default.
                    HTML generated here: testsuite/hpc_output/hpc_index.html
  --normal          Default settings
  --fast            Omit dyn way, omit binary distribution
  --slow            Build stage2 with -DDEBUG.
                    2008-07-01: 14% slower than the default.
  --dph:            Also build libraries/dph and run associated tests.
  --help            shows this usage help.

  Set environment variable 'CPUS' to number of cores, to exploit
  multiple cpu cores, e.g.

    CPUS=8 ./validate

EOF
}

no_clean=0
testsuite_only=0
hpc=NO
speed=NORMAL
use_dph=0

while [ $# -gt 0 ]
do
    case "$1" in
    --no-clean)
        no_clean=1
        ;;
    --testsuite-only)
        testsuite_only=1
        ;;
    --hpc)
        hpc=YES
        ;;
    --slow)
        speed=SLOW
        ;;
    --fast)
        speed=FAST
        ;;
    --normal)
        speed=NORMAL
        ;;
    --no-dph) # for backward compat
        use_dph=0
        ;;
    --dph)
        use_dph=1
        ;;
    --help)
        show_help
        exit 0;;
    *)
        echo "$0: unrecognized argument '$1'" >&2
        echo "Try '$0 --help' for more information." >&2
        exit 1;;
    esac
    shift
done

check_packages () {
    echo "== Start $1 package check"
    if [ "$bindistdir" = "" ]
    then
        inplace/bin/ghc-pkg check -v
    else
        "$bindistdir"/bin/ghc-pkg check -v
    fi
    echo "== End $1 package check"
}

detect_cpu_count () {
    if [ "$CPUS" = "" ]; then
        # Windows standard environment variable
        CPUS="$NUMBER_OF_PROCESSORS"
    fi

    if [ "$CPUS" = "" ]; then
        # Linux
        CPUS=`getconf _NPROCESSORS_ONLN 2>/dev/null`
    fi

    if [ "$CPUS" = "" ]; then
        # FreeBSD
        CPUS=`getconf NPROCESSORS_ONLN 2>/dev/null`
    fi

    if [ "$CPUS" = "" ]; then
        # nothing helped
        CPUS="1"
    fi

    echo "using ${CPUS} CPUs" >&2
}

detect_cpu_count

if ! [ -d testsuite ]
then
    echo 'Could not find the testsuite for validation' >&2
    exit 1
fi

if [ "$THREADS" = "" ]; then
    threads=$(($CPUS + 1)) # `expr $CPUS + 1`
else
    threads="$THREADS"
fi

if type gmake > /dev/null 2> /dev/null
then
    make="gmake"
else
    make="make"
fi

if [ $testsuite_only -eq 0 ]; then

if [ $no_clean -eq 0 ]; then
    $make maintainer-clean NO_CLEAN_GMP=YES

    INSTDIR=`pwd`/inst
    if [ "$OSTYPE" = "cygwin" ]
    then
        INSTDIR=`cygpath -m "$INSTDIR"`
    fi

    if [ $use_dph -eq 1 ]; then
        /usr/bin/perl -w boot --validate --required-tag=dph
    else
        /usr/bin/perl -w boot --validate
    fi
    ./configure --prefix="$INSTDIR" $config_args
fi

thisdir=`utils/ghc-pwd/dist-boot/ghc-pwd`

echo "Validating=YES"       >  mk/are-validating.mk
echo "ValidateSpeed=$speed" >> mk/are-validating.mk
echo "ValidateHpc=$hpc"     >> mk/are-validating.mk

if [ $use_dph -eq 1 ]; then
    echo "BUILD_DPH=YES"    >> mk/are-validating.mk
else
    echo "BUILD_DPH=NO"     >> mk/are-validating.mk
fi

$make -j$threads
# For a "debug make", add "--debug=b --debug=m"

check_packages post-build

# -----------------------------------------------------------------------------
# Build and test a binary distribution (not --fast)

if [ $speed != "FAST" ]; then

    $make binary-dist-prep
    $make test_bindist TEST_PREP=YES

    #
    # Install the xhtml package into the bindist.
    # This verifies that we can install a package into the
    # bindist with Cabal.
    #
    bindistdir="bindisttest/install   dir"

    check_packages post-install

    $make validate_build_xhtml BINDIST_PREFIX="$thisdir/$bindistdir"

    check_packages post-xhtml
fi

fi # testsuite-only

# -----------------------------------------------------------------------------
# Run the testsuite

if [ "$hpc" = YES ]
then
    # XXX With threads we'd need to give a different tix file to each thread
    #     and then sum them up at the end
    threads=1
    HPCTIXFILE=$thisdir/testsuite/hpc_output/ghc.tix
    export HPCTIXFILE
    rm -f $HPCTIXFILE
fi

case "$speed" in
SLOW)
        MAKE_TEST_TARGET=fulltest
        BINDIST="BINDIST=YES"
        ;;
NORMAL)
        MAKE_TEST_TARGET=test
        BINDIST="BINDIST=YES"
        ;;
FAST)
        MAKE_TEST_TARGET=test
        BINDIST="BINDIST=NO"
        ;;
esac

$make $MAKE_TEST_TARGET stage=2 $BINDIST THREADS=$threads 2>&1 | tee testlog

check_packages post-testsuite

if [ "$hpc" = YES ]
then
    utils/hpc/hpc markup --hpcdir=. --srcdir=compiler --srcdir=testsuite/hpc_output --destdir=testsuite/hpc_output testsuite/hpc_output/ghc.tix
fi

echo "-------------------------------------------------------------------"
if
    grep '\<0 caused framework failures' testlog >/dev/null 2>/dev/null &&
    grep '\<0 unexpected passes' testlog >/dev/null 2>/dev/null &&
    grep '\<0 unexpected failures' testlog >/dev/null 2>/dev/null &&
    ! grep 'Some files are written by multiple tests' testlog >/dev/null 2>/dev/null ; then
    if [ $testsuite_only -eq 0 ] && [ $no_clean -eq 0 ]
    then
        cat <<EOF
Congratulations!  This tree has passed minimal testing.

NOTE: If you have made changes that may cause failures not tested for by
the minimal testing procedure, please do further testing as necessary.

When you are satisfied that you haven't broken anything, go ahead and
push/send your patches.
EOF
        if [ -f mk/validate.mk ] && grep -q "^[^#]" mk/validate.mk
        then
            cat <<EOF

WARNING: You seem to have things set in mk/validate.mk. Please check
that it is OK before pushing.
EOF
        fi
        cat <<EOF
-------------------------------------------------------------------
EOF
    else
        cat <<EOF
I didn't find any problems, but this wasn't a complete validate run,
so be careful!

NOTE: If you have made changes that may cause failures not tested for by
the minimal testing procedure, please do further testing as necessary.
-------------------------------------------------------------------
EOF
   fi
else
    cat <<EOF
Oops!  Looks like you have some unexpected test results or framework failures.
Please fix them before pushing/sending patches.
-------------------------------------------------------------------
EOF
    exit 1
fi