#!/bin/sh
# build id cache operations
# SPDX-License-Identifier: GPL-2.0

# skip if there's no readelf
if ! [ -x "$(command -v readelf)" ]; then
	echo "failed: no readelf, install binutils"
	exit 2
fi

# skip if there's no compiler
if ! [ -x "$(command -v cc)" ]; then
	echo "failed: no compiler, install gcc"
	exit 2
fi

# check what we need to test windows binaries
add_pe=1
run_pe=1
if ! perf version --build-options | grep -q 'libbfd: .* on '; then
	echo "WARNING: perf not built with libbfd. PE binaries will not be tested."
	add_pe=0
	run_pe=0
fi
if ! which wine > /dev/null; then
	echo "WARNING: wine not found. PE binaries will not be run."
	run_pe=0
fi

# set up wine
if [ ${run_pe} -eq 1 ]; then
	wineprefix=$(mktemp -d /tmp/perf.wineprefix.XXX)
	export WINEPREFIX=${wineprefix}
	# clear display variables to prevent wine from popping up dialogs
	unset DISPLAY
	unset WAYLAND_DISPLAY
fi

ex_md5=$(mktemp /tmp/perf.ex.MD5.XXX)
ex_sha1=$(mktemp /tmp/perf.ex.SHA1.XXX)
ex_pe=$(dirname $0)/../pe-file.exe

echo 'int main(void) { return 0; }' | cc -Wl,--build-id=sha1 -o ${ex_sha1} -x c -
echo 'int main(void) { return 0; }' | cc -Wl,--build-id=md5 -o ${ex_md5} -x c -

echo "test binaries: ${ex_sha1} ${ex_md5} ${ex_pe}"

check()
{
	case $1 in
	*.exe)
		# We don't have a tool that can pull a nicely formatted build-id out of
		# a PE file, but we can extract the whole section with objcopy and
		# format it ourselves. The .buildid section is a Debug Directory
		# containing a CodeView entry:
		#     https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#debug-directory-image-only
		#     https://github.com/dotnet/runtime/blob/da94c022576a5c3bbc0e896f006565905eb137f9/docs/design/specs/PE-COFF.md
		# The build-id starts at byte 33 and must be rearranged into a GUID.
		id=`objcopy -O binary --only-section=.buildid $1 /dev/stdout | \
			cut -c 33-48 | hexdump -ve '/1 "%02x"' | \
			sed 's@^\(..\)\(..\)\(..\)\(..\)\(..\)\(..\)\(..\)\(..\)\(.*\)0a$@\4\3\2\1\6\5\8\7\9@'`
		;;
	*)
		id=`readelf -n ${1} 2>/dev/null | grep 'Build ID' | awk '{print $3}'`
		;;
	esac
	echo "build id: ${id}"

	link=${build_id_dir}/.build-id/${id:0:2}/${id:2}
	echo "link: ${link}"

	if [ ! -h $link ]; then
		echo "failed: link ${link} does not exist"
		exit 1
	fi

	file=${build_id_dir}/.build-id/${id:0:2}/`readlink ${link}`/elf
	echo "file: ${file}"

	if [ ! -x $file ]; then
		echo "failed: file ${file} does not exist"
		exit 1
	fi

	diff ${file} ${1}
	if [ $? -ne 0 ]; then
		echo "failed: ${file} do not match"
		exit 1
	fi

	${perf} buildid-cache -l | grep ${id}
	if [ $? -ne 0 ]; then
		echo "failed: ${id} is not reported by \"perf buildid-cache -l\""
		exit 1
	fi

	echo "OK for ${1}"
}

test_add()
{
	build_id_dir=$(mktemp -d /tmp/perf.debug.XXX)
	perf="perf --buildid-dir ${build_id_dir}"

	${perf} buildid-cache -v -a ${1}
	if [ $? -ne 0 ]; then
		echo "failed: add ${1} to build id cache"
		exit 1
	fi

	check ${1}

	rm -rf ${build_id_dir}
}

test_record()
{
	data=$(mktemp /tmp/perf.data.XXX)
	build_id_dir=$(mktemp -d /tmp/perf.debug.XXX)
	log=$(mktemp /tmp/perf.log.XXX)
	perf="perf --buildid-dir ${build_id_dir}"

	echo "running: perf record $@"
	${perf} record --buildid-all -o ${data} $@ &> ${log}
	if [ $? -ne 0 ]; then
		echo "failed: record $@"
		echo "see log: ${log}"
		exit 1
	fi

	check ${@: -1}

	rm -f ${log}
	rm -rf ${build_id_dir}
	rm -rf ${data}
}

# add binaries manual via perf buildid-cache -a
test_add ${ex_sha1}
test_add ${ex_md5}
if [ ${add_pe} -eq 1 ]; then
	test_add ${ex_pe}
fi

# add binaries via perf record post processing
test_record ${ex_sha1}
test_record ${ex_md5}
if [ ${run_pe} -eq 1 ]; then
	test_record wine ${ex_pe}
fi

# cleanup
rm ${ex_sha1} ${ex_md5}
if [ ${run_pe} -eq 1 ]; then
	rm -r ${wineprefix}
fi

exit ${err}