#!/bin/sh

EV_PROFILE_DIR_NAME="profiling"
EV_PROFDATA_OUTPUT_FILE_NAME="z3.profdata"
EV_PROFDATA_ARCHIVE_NAME="${EV_PROFDATA_OUTPUT_FILE_NAME}.tar.xz"

elog() {
	echo "$@" >/dev/stderr
}

# Search for a required binary
req_bin() {
	local name="$1"
	local path

	if ! /usr/bin/which -s realpath; then
		elog 'realpath not found; try "sudo port install realpath"'
		return 1
	fi

	if ! path=$(/usr/bin/which "${name}" 2>/dev/null) || [ ! -x "${path}" ]; then
		elog "${name} not found"
		return 1
	fi

	realpath "${path}" || return $?
	return 0
}

# Parse arguments
EV_PROFDATA_ARCHIVE=""
EV_LLVM_PROFDATA="llvm-profdata-mp-10"
EV_Z3="z3-fstar"
EV_JOBS=1
EV_QLOG=0
EV_RLIMIT_FACTOR=""
EV_SKIP_BUILD=0
EV_SKIP_MERGE=0

print_usage() {
	local arg0="$1"
	elog "Usage: $arg0 [-hqnm] [-l <llvm-profdata>] [-z <z3>] [-j <jobs>] [-r <rlimit_factor>] [-o <output archive>] <everest src>"
	elog "  -h                  print this help"
	elog "  -q                  enable SMT query logging"
	elog "  -n                  skip build (only perform merge and archiving)"
	elog "  -m                  skip build and merge (only perform archiving)"
	elog "  -j <jobs>           maximum number of parallel build jobs (default 1)"
	elog "  -r <rlimit_factor>  z3rlimit_factor to be passed to F*"
	elog "  -o <output archive> output archive path [default: <everest src>/${EV_PROFILE_DIR_NAME}/${EV_PROFDATA_ARCHIVE_NAME}]"
	elog "  -l <llvm-profdata>  llvm-profdata tool to be used to merge profile data [default: $EV_LLVM_PROFDATA]"
	elog "  -z <z3>             z3 path [default: $EV_Z3]"
}

args=`getopt hqnmj:r:z:l:o: $*`
if [ $? -ne 0 ]; then
	print_usage "$0"
	exit 2
fi
set -- $args

while :; do
	case "$1" in
		-h)
			print_usage "$0"
			exit 0
			;;
		-j)
			EV_JOBS="$2"
			shift; shift
			;;
		-r)
			EV_RLIMIT_FACTOR="$2"
			shift; shift
			;;
		-z)
			EV_Z3="$2"
			shift; shift
			;;
		-l)
			EV_LLVM_PROFDATA="$2"
			shift; shift
			;;
		-o)
			EV_PROFDATA_ARCHIVE="$2"
			shift; shift
			;;
		-q)
			EV_QLOG="1"
			shift
			;;
		-n)
			EV_SKIP_BUILD="1"
			shift
			;;
		-m)
			EV_SKIP_BUILD="1"
			EV_SKIP_MERGE="1"
			shift
			;;
		--)
			shift; break
			;;
		esac
done

if [ $# -lt 1 ]; then
	print_usage "$0"
	exit 1
fi

EV_SRC="$(realpath "$1")" || exit $?
if [ ! -d "${EV_SRC}" ]; then
	elog "No such directory: ${EV_SRC}"
	exit 1
fi

EV_SH="${EV_SRC}/everest"

EV_SH=$(req_bin "${EV_SH}") || exit $?
EV_Z3=$(req_bin "${EV_Z3}") || exit $?
EV_LLVM_PROFDATA=$(req_bin "${EV_LLVM_PROFDATA}") || exit $?

EV_PROFILE_DIR="${EV_SRC}/${EV_PROFILE_DIR_NAME}"
EV_LOG="${EV_PROFILE_DIR}/build.log"
EV_PROFILE_BIN_DIR="${EV_PROFILE_DIR}/bin"
EV_PROFILE_BIN_Z3="${EV_PROFILE_BIN_DIR}/z3"
EV_PROFRAW_OUTPUT_FILE="${EV_PROFILE_DIR}/z3-fstar-%m-%p.profraw"
EV_PROFDATA_OUTPUT_FILE="${EV_PROFILE_DIR}/${EV_PROFDATA_OUTPUT_FILE_NAME}"

if [ -z "${EV_PROFDATA_ARCHIVE}" ]; then
	EV_PROFDATA_ARCHIVE="${EV_PROFDATA_OUTPUT_FILE}.tar.xz"
fi

EV_PROFDATA_ARCHIVE=$(realpath "${EV_PROFDATA_ARCHIVE}") || exit $?

elog "Configuration:"
elog "  everest:        ${EV_SRC}"
elog "  llvm-profdata:  ${EV_LLVM_PROFDATA}"
elog "  z3:             ${EV_Z3}"
elog "  archive output: ${EV_PROFDATA_ARCHIVE}"
elog "  build log:      ${EV_LOG}"
elog "  build jobs:     ${EV_JOBS}"

mkdir -p "${EV_PROFILE_BIN_DIR}"     || exit $?
rm -f "${EV_PROFILE_BIN_Z3}" 		 || exit $?
cp "${EV_Z3}" "${EV_PROFILE_BIN_Z3}" || exit $?

if [ "${EV_SKIP_BUILD}" -eq 1 ]; then
	elog "\nSkipping build..."
else
	EV_OTHERFLAGS="--smt \"${EV_PROFILE_BIN_Z3}\""

	if [ ${EV_QLOG} -eq 1 ]; then
		EV_OTHERFLAGS="${EV_OTHERFLAGS} --log_queries"
	fi

	if [ ! -z "${EV_RLIMIT_FACTOR}" ]; then
		EV_OTHERFLAGS="${EV_OTHERFLAGS} --z3rlimit_factor \"${EV_RLIMIT_FACTOR}\""
	fi

	elog "\nBuilding ..."
	env \
		PATH="${EV_PROFILE_BIN_DIR}:$PATH" \
		LLVM_PROFILE_FILE="${EV_PROFRAW_OUTPUT_FILE}" \
		OTHERFLAGS="${EV_OTHERFLAGS}" \
		"${EV_SH}" \
		-j "${EV_JOBS}" \
		make >"${EV_LOG}" 2>&1

	if [ $? -ne 0 ]; then
		elog "Build failed; see ${EV_LOG}"
		exit 1
	fi
fi

if [ "${EV_SKIP_MERGE}" -eq 1 ]; then
	elog "Skipping merge..."
else
	elog "Merging profiles..."
	"${EV_LLVM_PROFDATA}" \
		merge \
		--failure-mode=all \
		--output="${EV_PROFDATA_OUTPUT_FILE}" \
		"${EV_PROFILE_DIR}"/z3-fstar-*.profraw || exit $?
fi

elog "Generating ${EV_PROFDATA_ARCHIVE}..."

tar \
	-Jcf "${EV_PROFDATA_ARCHIVE}" \
	-C "$(dirname "${EV_PROFDATA_OUTPUT_FILE}")" \
	"$(basename "${EV_PROFDATA_OUTPUT_FILE}")" || exit $?