Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(222)

Side by Side Diff: build/gdb-add-index

Issue 2101243005: Add a snapshot of flutter/engine/src/build to our sdk (Closed) Base URL: git@github.com:dart-lang/sdk.git@master
Patch Set: add README.dart Created 4 years, 5 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View unified diff | Download patch
« no previous file with comments | « build/find_isolated_tests.py ('k') | build/get_landmines.py » ('j') | no next file with comments »
Toggle Intra-line Diffs ('i') | Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
OLDNEW
(Empty)
1 #!/bin/bash
2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
5 #
6 # Saves the gdb index for a given binary and its shared library dependencies.
7 #
8 # This will run gdb index in parallel on a number of binaries using SIGUSR1
9 # as the communication mechanism to simulate a semaphore. Because of the
10 # nature of this technique, using "set -e" is very difficult. The SIGUSR1
11 # terminates a "wait" with an error which we need to interpret.
12 #
13 # When modifying this code, most of the real logic is in the index_one_file
14 # function. The rest is cleanup + sempahore plumbing.
15
16 # Cleanup temp directory and ensure all child jobs are dead-dead.
17 function on_exit {
18 trap "" EXIT USR1 # Avoid reentrancy.
19
20 local jobs=$(jobs -p)
21 if [ -n "$jobs" ]; then
22 echo -n "Killing outstanding index jobs..."
23 kill -KILL $(jobs -p)
24 wait
25 echo "done"
26 fi
27
28 if [ -f "$DIRECTORY" ]; then
29 echo -n "Removing temp directory $DIRECTORY..."
30 rm -rf $DIRECTORY
31 echo done
32 fi
33 }
34
35 # Add index to one binary.
36 function index_one_file {
37 local file=$1
38 local basename=$(basename "$file")
39 local should_index="${SHOULD_INDEX}"
40
41 local readelf_out=$(${TOOLCHAIN_PREFIX}readelf -S "$file")
42 if [[ $readelf_out =~ "gdb_index" ]]; then
43 if [ "${REMOVE_INDEX}" = 1 ]; then
44 ${TOOLCHAIN_PREFIX}objcopy --remove-section .gdb_index "$file"
45 echo "Removed index from $basename."
46 else
47 echo "Skipped $basename -- already contains index."
48 should_index=0
49 fi
50 fi
51
52 if [ "${should_index}" = 1 ]; then
53 local start=$(date +"%s%N")
54 echo "Adding index to $basename..."
55
56 ${TOOLCHAIN_PREFIX}gdb -batch "$file" -ex "save gdb-index $DIRECTORY" \
57 -ex "quit"
58 local index_file="$DIRECTORY/$basename.gdb-index"
59 if [ -f "$index_file" ]; then
60 ${TOOLCHAIN_PREFIX}objcopy --add-section .gdb_index="$index_file" \
61 --set-section-flags .gdb_index=readonly "$file" "$file"
62 local finish=$(date +"%s%N")
63 local elapsed=$(((finish - start)/1000000))
64 echo " ...$basename indexed. [${elapsed}ms]"
65 else
66 echo " ...$basename unindexable."
67 fi
68 fi
69 }
70
71 # Functions that when combined, concurrently index all files in FILES_TO_INDEX
72 # array. The global FILES_TO_INDEX is declared in the main body of the script.
73 function async_index {
74 # Start a background subshell to run the index command.
75 {
76 index_one_file $1
77 kill -SIGUSR1 $$ # $$ resolves to the parent script.
78 exit 129 # See comment above wait loop at bottom.
79 } &
80 }
81
82 CUR_FILE_NUM=0
83 function index_next {
84 if (( CUR_FILE_NUM >= ${#FILES_TO_INDEX[@]} )); then
85 return
86 fi
87
88 async_index "${FILES_TO_INDEX[CUR_FILE_NUM]}"
89 ((CUR_FILE_NUM += 1)) || true
90 }
91
92
93 ########
94 ### Main body of the script.
95
96 REMOVE_INDEX=0
97 SHOULD_INDEX=1
98 while getopts ":f:r" opt; do
99 case $opt in
100 f)
101 REMOVE_INDEX=1
102 shift
103 ;;
104 r)
105 REMOVE_INDEX=1
106 SHOULD_INDEX=0
107 shift
108 ;;
109 *)
110 echo "Invalid option: -$OPTARG" >&2
111 ;;
112 esac
113 done
114
115 if [[ ! $# == 1 ]]; then
116 echo "Usage: $0 [-f] [-r] path-to-binary"
117 echo " -f forces replacement of an existing index."
118 echo " -r removes the index section."
119 exit 1
120 fi
121
122 FILENAME="$1"
123 if [[ ! -f "$FILENAME" ]]; then
124 echo "Path $FILENAME does not exist."
125 exit 1
126 fi
127
128 # Ensure we cleanup on on exit.
129 trap on_exit EXIT
130
131 # We're good to go! Create temp directory for index files.
132 DIRECTORY=$(mktemp -d)
133 echo "Made temp directory $DIRECTORY."
134
135 # Create array with the filename and all shared libraries that
136 # have the same dirname. The dirname is a signal that these
137 # shared libraries were part of the same build as the binary.
138 declare -a FILES_TO_INDEX=($FILENAME
139 $(ldd "$FILENAME" 2>/dev/null \
140 | grep $(dirname "$FILENAME") \
141 | sed "s/.*[ \t]\(.*\) (.*/\1/")
142 )
143
144 # Start concurrent indexing.
145 trap index_next USR1
146
147 # 4 is an arbitrary default. When changing, remember we are likely IO bound
148 # so basing this off the number of cores is not sensible.
149 INDEX_TASKS=${INDEX_TASKS:-4}
150 for ((i=0;i<${INDEX_TASKS};i++)); do
151 index_next
152 done
153
154 # Do a wait loop. Bash waits that terminate due a trap have an exit
155 # code > 128. We also ensure that our subshell's "normal" exit occurs with
156 # an exit code > 128. This allows us to do consider a > 128 exit code as
157 # an indication that the loop should continue. Unfortunately, it also means
158 # we cannot use set -e since technically the "wait" is failing.
159 wait
160 while (( $? > 128 )); do
161 wait
162 done
OLDNEW
« no previous file with comments | « build/find_isolated_tests.py ('k') | build/get_landmines.py » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698