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#!/bin/bash | ||
# Copyright (c) 2012 The Chromium Authors. All rights reserved. | ||
# Use of this source code is governed by a BSD-style license that can be | ||
# found in the LICENSE file. | ||
# | ||
# Saves the gdb index for a given binary and its shared library dependencies. | ||
# | ||
# This will run gdb index in parallel on a number of binaries using SIGUSR1 | ||
# as the communication mechanism to simulate a semaphore. Because of the | ||
# nature of this technique, using "set -e" is very difficult. The SIGUSR1 | ||
# terminates a "wait" with an error which we need to interpret. | ||
# | ||
# When modifying this code, most of the real logic is in the index_one_file | ||
# function. The rest is cleanup + sempahore plumbing. | ||
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function usage_exit { | ||
echo "Usage: $0 [-f] [-r] [-n] <paths-to-binaries>..." | ||
echo " -f forces replacement of an existing index." | ||
echo " -r removes the index section." | ||
echo " -n don't extract the dependencies of each binary with lld." | ||
echo " e.g., $0 -n out/Debug/lib.unstripped/lib*" | ||
echo | ||
echo " Set TOOLCHAIN_PREFIX to use a non-default set of binutils." | ||
exit 1 | ||
} | ||
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# Cleanup temp directory and ensure all child jobs are dead-dead. | ||
function on_exit { | ||
trap "" EXIT USR1 # Avoid reentrancy. | ||
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local jobs=$(jobs -p) | ||
if [ -n "$jobs" ]; then | ||
echo -n "Killing outstanding index jobs..." | ||
kill -KILL $(jobs -p) | ||
wait | ||
echo "done" | ||
fi | ||
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if [ -d "$directory" ]; then | ||
echo -n "Removing temp directory $directory..." | ||
rm -rf "$directory" | ||
echo done | ||
fi | ||
} | ||
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# Add index to one binary. | ||
function index_one_file { | ||
local file=$1 | ||
local basename=$(basename "$file") | ||
local should_index_this_file="${should_index}" | ||
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local readelf_out=$(${TOOLCHAIN_PREFIX}readelf -S "$file") | ||
if [[ $readelf_out =~ "gdb_index" ]]; then | ||
if $remove_index; then | ||
${TOOLCHAIN_PREFIX}objcopy --remove-section .gdb_index "$file" | ||
echo "Removed index from $basename." | ||
else | ||
echo "Skipped $basename -- already contains index." | ||
should_index_this_file=false | ||
fi | ||
fi | ||
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if $should_index_this_file; then | ||
local start=$(date +"%s%N") | ||
echo "Adding index to $basename..." | ||
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${TOOLCHAIN_PREFIX}gdb -batch "$file" -ex "save gdb-index $directory" \ | ||
-ex "quit" | ||
local index_file="$directory/$basename.gdb-index" | ||
if [ -f "$index_file" ]; then | ||
${TOOLCHAIN_PREFIX}objcopy --add-section .gdb_index="$index_file" \ | ||
--set-section-flags .gdb_index=readonly "$file" "$file" | ||
local finish=$(date +"%s%N") | ||
local elapsed=$(((finish - start) / 1000000)) | ||
echo " ...$basename indexed. [${elapsed}ms]" | ||
else | ||
echo " ...$basename unindexable." | ||
fi | ||
fi | ||
} | ||
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# Functions that when combined, concurrently index all files in FILES_TO_INDEX | ||
# array. The global FILES_TO_INDEX is declared in the main body of the script. | ||
function async_index { | ||
# Start a background subshell to run the index command. | ||
{ | ||
index_one_file $1 | ||
kill -SIGUSR1 $$ # $$ resolves to the parent script. | ||
exit 129 # See comment above wait loop at bottom. | ||
} & | ||
} | ||
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cur_file_num=0 | ||
function index_next { | ||
if ((cur_file_num >= ${#files_to_index[@]})); then | ||
return | ||
fi | ||
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async_index "${files_to_index[cur_file_num]}" | ||
((cur_file_num += 1)) || true | ||
} | ||
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######## | ||
### Main body of the script. | ||
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remove_index=false | ||
should_index=true | ||
should_index_deps=true | ||
files_to_index=() | ||
while (($# > 0)); do | ||
case "$1" in | ||
-h) | ||
usage_exit | ||
;; | ||
-f) | ||
remove_index=true | ||
;; | ||
-r) | ||
remove_index=true | ||
should_index=false | ||
;; | ||
-n) | ||
should_index_deps=false | ||
;; | ||
-*) | ||
echo "Invalid option: $1" >&2 | ||
usage_exit | ||
;; | ||
*) | ||
if [[ ! -f "$1" ]]; then | ||
echo "Path $1 does not exist." | ||
exit 1 | ||
fi | ||
files_to_index+=("$1") | ||
;; | ||
esac | ||
shift | ||
done | ||
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if ((${#files_to_index[@]} == 0)); then | ||
usage_exit | ||
fi | ||
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dependencies=() | ||
if $should_index_deps; then | ||
for file in "${files_to_index[@]}"; do | ||
# Append the shared library dependencies of this file that | ||
# have the same dirname. The dirname is a signal that these | ||
# shared libraries were part of the same build as the binary. | ||
dependencies+=( \ | ||
$(ldd "$file" 2>/dev/null \ | ||
| grep $(dirname "$file") \ | ||
| sed "s/.*[ \t]\(.*\) (.*/\1/") \ | ||
) | ||
done | ||
fi | ||
files_to_index+=("${dependencies[@]}") | ||
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# Ensure we cleanup on on exit. | ||
trap on_exit EXIT INT | ||
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# We're good to go! Create temp directory for index files. | ||
directory=$(mktemp -d) | ||
echo "Made temp directory $directory." | ||
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# Start concurrent indexing. | ||
trap index_next USR1 | ||
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# 4 is an arbitrary default. When changing, remember we are likely IO bound | ||
# so basing this off the number of cores is not sensible. | ||
index_tasks=${INDEX_TASKS:-4} | ||
for ((i = 0; i < index_tasks; i++)); do | ||
index_next | ||
done | ||
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# Do a wait loop. Bash waits that terminate due a trap have an exit | ||
# code > 128. We also ensure that our subshell's "normal" exit occurs with | ||
# an exit code > 128. This allows us to do consider a > 128 exit code as | ||
# an indication that the loop should continue. Unfortunately, it also means | ||
# we cannot use set -e since technically the "wait" is failing. | ||
wait | ||
while (($? > 128)); do | ||
wait | ||
done |
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#!/bin/bash | ||
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SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )" | ||
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function usage_exit { | ||
echo "Usage: $0 <directory-containing-binaries>..." | ||
echo | ||
echo " Set TOOLCHAIN_PREFIX to use a non-default set of binutils." | ||
exit 1 | ||
} | ||
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if (($# <= 0)); then | ||
echo "no directory to index provided." >&2 | ||
echo "aborting." >&2 | ||
exit 1 | ||
elif (($# > 1)); then | ||
echo "too many arguments." >&2 | ||
echo "aborting." >&2 | ||
exit 1 | ||
elif [ ! -d "$1" ]; then | ||
echo "$1 is not a directory." >&2 | ||
echo "aborting." >&2 | ||
exit 1 | ||
else | ||
dir_to_index=("$1") | ||
fi | ||
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export myodirs=$(find "$dir_to_index" -name "*.o" | sort | sed -e 's/^\(.*\)\/.*/\1/' | uniq) | ||
for odir in $myodirs; do | ||
files=($odir/*.o) | ||
echo "Indexing directory $odir" # , files: ${files[@]}" | ||
${SCRIPT_DIR}/gdb-add-index ${files[@]} | ||
done |