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- #!/bin/bash -e
- # Copyright 2017 Google Inc. All rights reserved.
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- # Script to handle the various ways soong may need to strip binaries
- # Inputs:
- # Environment:
- # CLANG_BIN: path to the clang bin directory
- # XZ: path to the xz binary
- # Arguments:
- # -i ${file}: input file (required)
- # -o ${file}: output file (required)
- # -d ${file}: deps file (required)
- # -k symbols: Symbols to keep (optional)
- # --add-gnu-debuglink
- # --keep-mini-debug-info
- # --keep-symbols
- # --keep-symbols-and-debug-frame
- # --remove-build-id
- set -o pipefail
- OPTSTRING=d:i:o:k:-:
- usage() {
- cat <<EOF
- Usage: strip.sh [options] -k symbols -i in-file -o out-file -d deps-file
- Options:
- --add-gnu-debuglink Add a gnu-debuglink section to out-file
- --keep-mini-debug-info Keep compressed debug info in out-file
- --keep-symbols Keep symbols in out-file
- --keep-symbols-and-debug-frame Keep symbols and .debug_frame in out-file
- --remove-build-id Remove the gnu build-id section in out-file
- EOF
- exit 1
- }
- do_strip() {
- # GNU strip --strip-all does not strip .ARM.attributes,
- # so we tell llvm-strip to keep it too.
- "${CLANG_BIN}/llvm-strip" --strip-all --keep-section=.ARM.attributes "${infile}" -o "${outfile}.tmp"
- }
- do_strip_keep_symbols_and_debug_frame() {
- REMOVE_SECTIONS=`"${CLANG_BIN}/llvm-readelf" -S "${infile}" | awk '/.debug_/ {if ($2 != ".debug_frame") {print "--remove-section " $2}}' | xargs`
- "${CLANG_BIN}/llvm-objcopy" "${infile}" "${outfile}.tmp" ${REMOVE_SECTIONS}
- }
- do_strip_keep_symbols() {
- REMOVE_SECTIONS=`"${CLANG_BIN}/llvm-readelf" -S "${infile}" | awk '/.debug_/ {print "--remove-section " $2}' | xargs`
- "${CLANG_BIN}/llvm-objcopy" "${infile}" "${outfile}.tmp" ${REMOVE_SECTIONS}
- }
- do_strip_keep_symbol_list() {
- echo "${symbols_to_keep}" | tr ',' '\n' > "${outfile}.symbolList"
- KEEP_SYMBOLS="--strip-unneeded-symbol=* --keep-symbols="
- KEEP_SYMBOLS+="${outfile}.symbolList"
- "${CLANG_BIN}/llvm-objcopy" -w "${infile}" "${outfile}.tmp" ${KEEP_SYMBOLS}
- }
- do_strip_keep_mini_debug_info_darwin() {
- rm -f "${outfile}.dynsyms" "${outfile}.funcsyms" "${outfile}.keep_symbols" "${outfile}.debug" "${outfile}.mini_debuginfo" "${outfile}.mini_debuginfo.xz"
- local fail=
- "${CLANG_BIN}/llvm-strip" --strip-all --keep-section=.ARM.attributes --remove-section=.comment "${infile}" -o "${outfile}.tmp" || fail=true
- if [ -z $fail ]; then
- "${CLANG_BIN}/llvm-objcopy" --only-keep-debug "${infile}" "${outfile}.debug"
- "${CLANG_BIN}/llvm-nm" -D "${infile}" --format=posix --defined-only 2> /dev/null | awk '{ print $1 }' | sort >"${outfile}.dynsyms"
- "${CLANG_BIN}/llvm-nm" "${infile}" --format=posix --defined-only | awk '{ if ($2 == "T" || $2 == "t" || $2 == "D") print $1 }' | sort > "${outfile}.funcsyms"
- comm -13 "${outfile}.dynsyms" "${outfile}.funcsyms" > "${outfile}.keep_symbols"
- echo >> "${outfile}.keep_symbols" # Ensure that the keep_symbols file is not empty.
- "${CLANG_BIN}/llvm-objcopy" -S --keep-section .debug_frame --keep-symbols="${outfile}.keep_symbols" "${outfile}.debug" "${outfile}.mini_debuginfo"
- "${XZ}" --keep --block-size=64k --threads=0 "${outfile}.mini_debuginfo"
- "${CLANG_BIN}/llvm-objcopy" --add-section .gnu_debugdata="${outfile}.mini_debuginfo.xz" "${outfile}.tmp"
- rm -f "${outfile}.dynsyms" "${outfile}.funcsyms" "${outfile}.keep_symbols" "${outfile}.debug" "${outfile}.mini_debuginfo" "${outfile}.mini_debuginfo.xz"
- else
- cp -f "${infile}" "${outfile}.tmp"
- fi
- }
- do_strip_keep_mini_debug_info_linux() {
- rm -f "${outfile}.mini_debuginfo.xz"
- local fail=
- "${CLANG_BIN}/llvm-strip" --strip-all --keep-section=.ARM.attributes --remove-section=.comment "${infile}" -o "${outfile}.tmp" || fail=true
- if [ -z $fail ]; then
- "${CREATE_MINIDEBUGINFO}" "${infile}" "${outfile}.mini_debuginfo.xz"
- "${CLANG_BIN}/llvm-objcopy" --add-section .gnu_debugdata="${outfile}.mini_debuginfo.xz" "${outfile}.tmp"
- rm -f "${outfile}.mini_debuginfo.xz"
- else
- cp -f "${infile}" "${outfile}.tmp"
- fi
- }
- do_strip_keep_mini_debug_info() {
- case $(uname) in
- Linux)
- do_strip_keep_mini_debug_info_linux
- ;;
- Darwin)
- do_strip_keep_mini_debug_info_darwin
- ;;
- *) echo "unknown OS:" $(uname) >&2 && exit 1;;
- esac
- }
- do_add_gnu_debuglink() {
- "${CLANG_BIN}/llvm-objcopy" --add-gnu-debuglink="${infile}" "${outfile}.tmp"
- }
- do_remove_build_id() {
- "${CLANG_BIN}/llvm-strip" --remove-section=.note.gnu.build-id "${outfile}.tmp" -o "${outfile}.tmp.no-build-id"
- rm -f "${outfile}.tmp"
- mv "${outfile}.tmp.no-build-id" "${outfile}.tmp"
- }
- while getopts $OPTSTRING opt; do
- case "$opt" in
- d) depsfile="${OPTARG}" ;;
- i) infile="${OPTARG}" ;;
- o) outfile="${OPTARG}" ;;
- k) symbols_to_keep="${OPTARG}" ;;
- -)
- case "${OPTARG}" in
- add-gnu-debuglink) add_gnu_debuglink=true ;;
- keep-mini-debug-info) keep_mini_debug_info=true ;;
- keep-symbols) keep_symbols=true ;;
- keep-symbols-and-debug-frame) keep_symbols_and_debug_frame=true ;;
- remove-build-id) remove_build_id=true ;;
- *) echo "Unknown option --${OPTARG}"; usage ;;
- esac;;
- ?) usage ;;
- *) echo "'${opt}' '${OPTARG}'"
- esac
- done
- if [ -z "${infile}" ]; then
- echo "-i argument is required"
- usage
- fi
- if [ -z "${outfile}" ]; then
- echo "-o argument is required"
- usage
- fi
- if [ -z "${depsfile}" ]; then
- echo "-d argument is required"
- usage
- fi
- if [ ! -z "${keep_symbols}" -a ! -z "${keep_mini_debug_info}" ]; then
- echo "--keep-symbols and --keep-mini-debug-info cannot be used together"
- usage
- fi
- if [ ! -z "${keep_symbols}" -a ! -z "${keep_symbols_and_debug_frame}" ]; then
- echo "--keep-symbols and --keep-symbols-and-debug-frame cannot be used together"
- usage
- fi
- if [ ! -z "${keep_mini_debug_info}" -a ! -z "${keep_symbols_and_debug_frame}" ]; then
- echo "--keep-symbols-mini-debug-info and --keep-symbols-and-debug-frame cannot be used together"
- usage
- fi
- if [ ! -z "${symbols_to_keep}" -a ! -z "${keep_symbols}" ]; then
- echo "--keep-symbols and -k cannot be used together"
- usage
- fi
- if [ ! -z "${add_gnu_debuglink}" -a ! -z "${keep_mini_debug_info}" ]; then
- echo "--add-gnu-debuglink cannot be used with --keep-mini-debug-info"
- usage
- fi
- rm -f "${outfile}.tmp"
- if [ ! -z "${keep_symbols}" ]; then
- do_strip_keep_symbols
- elif [ ! -z "${symbols_to_keep}" ]; then
- do_strip_keep_symbol_list
- elif [ ! -z "${keep_mini_debug_info}" ]; then
- do_strip_keep_mini_debug_info
- elif [ ! -z "${keep_symbols_and_debug_frame}" ]; then
- do_strip_keep_symbols_and_debug_frame
- else
- do_strip
- fi
- if [ ! -z "${add_gnu_debuglink}" ]; then
- do_add_gnu_debuglink
- fi
- if [ ! -z "${remove_build_id}" ]; then
- do_remove_build_id
- fi
- rm -f "${outfile}"
- mv "${outfile}.tmp" "${outfile}"
- cat <<EOF > "${depsfile}"
- ${outfile}: \
- ${infile} \
- ${CLANG_BIN}/llvm-nm \
- ${CLANG_BIN}/llvm-objcopy \
- ${CLANG_BIN}/llvm-readelf \
- ${CLANG_BIN}/llvm-strip
- EOF
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