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