test/fuzz: enable lcov for llvm-fuzzing

mkdir -p $rootdir/../corpus/ $llvm_out

function lcov_start() {

	local out=$llvm_out

	local src=$rootdir

	if hash lcov; then

		export LCOV_OPTS="

			--rc lcov_branch_coverage=1

			--rc lcov_function_coverage=1

			--rc genhtml_branch_coverage=1

			--rc genhtml_function_coverage=1

			--rc genhtml_legend=1

			--rc geninfo_all_blocks=1

			--gcov-tool $rootdir/test/fuzz/llvm/llvm-gcov.sh

			"

		export LCOV="lcov $LCOV_OPTS --no-external"

		# Print lcov version to log

		$LCOV -v

		# zero out coverage data

		$LCOV -q -c -i -t "Baseline" -d $src -o $out/cov_base.info

	fi

}

function lcov_stop() {

	local out=$llvm_out

	local src=$rootdir

	if hash lcov; then

		# generate coverage data and combine with baseline

		$LCOV -q -c -d $src -t "$(hostname)" -o $out/cov_test.info

		$LCOV -q -a $out/cov_base.info -a $out/cov_test.info -o $out/cov_total.info

		$LCOV -q -r $out/cov_total.info '*/dpdk/*' -o $out/cov_total.info

		$LCOV -q -r $out/cov_total.info '/usr/*' -o $out/cov_total.info

		owner=$(stat -c "%U" .)

		sudo -u $owner git clean -f "*.gcda"

		rm -f cov_base.info cov_test.info OLD_STDOUT OLD_STDERR

	fi

}

# Collect coverage data when run fuzzers for longer period of time

# this allow to check coverage progression between runs, and grow of corpus files

if [[ $SPDK_TEST_FUZZER -eq 1 || $SPDK_TEST_FUZZER_SHORT -eq 0 ]]; then

	lcov_start

fi

for fuzzer in "${fuzzers[@]}"; do

	case "$fuzzer" in

		nvmf) run_test "nvmf_fuzz" "$testdir/llvm/$fuzzer/run.sh" ;;

		vfio) run_test "vfio_fuzz" "$testdir/llvm/$fuzzer/run.sh" ;;

	esac

done

if [[ $SPDK_TEST_FUZZER -eq 1 || $SPDK_TEST_FUZZER_SHORT -eq 0 ]]; then

	lcov_stop

	genhtml $llvm_out/cov_total.info --output-directory $llvm_out

fi

#!/bin/bash

#  SPDX-License-Identifier: BSD-3-Clause

#  All rights reserved.

# Wrapper for llvm gcov, --gcov-tool

exec llvm-cov gcov "$@"