VimをSanitizer付きでビルドして、メモリリークを検出する
vim-jpでichizokさんに指南をいただきました。 ありがとうございます 😎
結
$ cd /path/to/vim
$ SANITIZER_CFLAGS="-g -O1 -DABORT_ON_INTERNAL_ERROR -DEXITFREE -fsanitize=address -fno-omit-frame-pointer"
$ ASAN_OPTIONS="print_stacktrace=1 log_path=asan"
$ make
Starting make in the src directory.
If there are problems, cd to the src directory and run make there
cd src && make first
make[1]: Entering directory '/path/to/vim/template-string/src'
ccache gcc -c -I. -Iproto -DHAVE_CONFIG_H -g3 -O0 -Wall -g -O1 -DABORT_ON_INTERNAL_ERROR -DEXITFREE -fsanitize=address -fno-omit-frame-pointer -o obj
ects/eval.o eval.c
make[2]: Entering directory '/path/to/vim/template-string/src/po'
make[2]: Nothing to be done for 'first'.
.
.
.
$ cd src/testdir
$ make test_template_string
rm -f test_template_string.res test.log messages
make -f Makefile test_template_string.res
make[1]: Entering directory '/path/to/vim/src/testdir'
make[1]: *** [Makefile:162: test_template_string.res] Error 1
make[1]: Leaving directory '/path/to/vim/src/testdir'
make: *** [Makefile:76: test_template_string] Error 2
$ ls asan.*
asan.12870
$ cat asan.12870結果
cat asan.12870
=================================================================
==35931==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 520 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590adfa521 (/usr/lib/libXt.so.6+0x13521)
Indirect leak of 21152 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590a88d291 (/usr/lib/libxcb.so.1+0xc291)
Indirect leak of 16384 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590acd7c13 (/usr/lib/libX11.so.6+0x30c13)
Indirect leak of 5040 byte(s) in 2 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590acd7f7d (/usr/lib/libX11.so.6+0x30f7d)
Indirect leak of 4688 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590acd78bf (/usr/lib/libX11.so.6+0x308bf)
#2 0x5631814de807 (/path/to/vim/template-string/src/vim+0x50e807)
#3 0x5631814af9ae (/path/to/vim/template-string/src/vim+0x4df9ae)
#4 0x563181718296 (/path/to/vim/template-string/src/vim+0x748296)
#5 0x563181714ff6 (/path/to/vim/template-string/src/vim+0x744ff6)
#6 0x7f590a8db152 (/usr/lib/libc.so.6+0x27152)
Indirect leak of 2372 byte(s) in 1 object(s) allocated from:
#0 0x563181203612 (/path/to/vim/template-string/src/vim+0x233612)
#1 0x7f590a88d47c (/usr/lib/libxcb.so.1+0xc47c)
Indirect leak of 628 byte(s) in 1 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590acd83f1 (/usr/lib/libX11.so.6+0x313f1)
Indirect leak of 168 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590acd81a0 (/usr/lib/libX11.so.6+0x311a0)
Indirect leak of 160 byte(s) in 1 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590acc67cc (/usr/lib/libX11.so.6+0x1f7cc)
Indirect leak of 152 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590ad3db8f (/usr/lib/libX11.so.6+0x96b8f)
Indirect leak of 132 byte(s) in 6 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590adfa2f5 (/usr/lib/libXt.so.6+0x132f5)
Indirect leak of 128 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590acd7e2c (/usr/lib/libX11.so.6+0x30e2c)
Indirect leak of 128 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590acd180c (/usr/lib/libX11.so.6+0x2a80c)
Indirect leak of 112 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590acd7efd (/usr/lib/libX11.so.6+0x30efd)
Indirect leak of 104 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590ace6f3f (/usr/lib/libX11.so.6+0x3ff3f)
Indirect leak of 72 byte(s) in 1 object(s) allocated from:
#0 0x563181203441 (/path/to/vim/template-string/src/vim+0x233441)
#1 0x7f590acd7c76 (/usr/lib/libX11.so.6+0x30c76)
Indirect leak of 48 byte(s) in 1 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590ace7055 (/usr/lib/libX11.so.6+0x40055)
Indirect leak of 48 byte(s) in 1 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590ace703e (/usr/lib/libX11.so.6+0x4003e)
Indirect leak of 40 byte(s) in 1 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590ace914e (/usr/lib/libX11.so.6+0x4214e)
Indirect leak of 32 byte(s) in 1 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590a88faa7 (/usr/lib/libxcb.so.1+0xeaa7)
Indirect leak of 32 byte(s) in 1 object(s) allocated from:
#0 0x563181203612 (/path/to/vim/template-string/src/vim+0x233612)
#1 0x7f590a89056f (/usr/lib/libxcb.so.1+0xf56f)
Indirect leak of 24 byte(s) in 1 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590ace7656 (/usr/lib/libX11.so.6+0x40656)
Indirect leak of 21 byte(s) in 1 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590acd7d95 (/usr/lib/libX11.so.6+0x30d95)
Indirect leak of 16 byte(s) in 1 object(s) allocated from:
#0 0x563181203289 (/path/to/vim/template-string/src/vim+0x233289)
#1 0x7f590a89092e (/usr/lib/libxcb.so.1+0xf92e)
Indirect leak of 10 byte(s) in 1 object(s) allocated from:
#0 0x563181180e99 (/path/to/vim/template-string/src/vim+0x1b0e99)
#1 0x7f590acd181d (/usr/lib/libX11.so.6+0x2a81d)
Indirect leak of 3 byte(s) in 1 object(s) allocated from:
#0 0x563181180e99 (/path/to/vim/template-string/src/vim+0x1b0e99)
#1 0x7f590acd78d4 (/usr/lib/libX11.so.6+0x308d4)
SUMMARY: AddressSanitizer: 52214 byte(s) leaked in 32 allocation(s).起
突然ですが現在、僕はVimにtemplate string対応を入れようと、活動しております。
- Proposal: the string interpolation (the template string) - Issue #4491 - vim/vim - GitHub
- Support 'template string' ('string interpolation') by aiya000 - Pull Request #4634 - vim/vim - GitHub
- Vim scriptにstring interpolation対応を入れる - 進捗ノート
具体的にはこんな感じ。
echo $'I have ${10}' " 'I have 10'
echo $'I like ${function("function")}' " I like function('function')
echo $'${[10, 20]}' " [10, 20]
echo $'${{"x": 10}}' " {'x': 10}
echo $'${42.1}' " 42.1ところでC言語はメモリリークがコワイですよね。
＼(・ω・＼)SAN値!(／・ω・)／ピンチ!
＼(・ω・＼)SAN値!(／・ω・)／ピンチ!
＼(・ω・＼)SAN値!(／・ω・)／ピンチ!
＼(・ω・＼)SAN値!(／・ω・)／ピン!
ということでSAN値チェックです。
- 以下のフラグ付きでmakeする
SANITIZER_CFLAGS="-g -O1 -DABORT_ON_INTERNAL_ERROR -DEXITFREE -fsanitize=address -fno-omit-frame-pointer"
- 以下のフラグ付きでVimを起動する
ASAN_OPTIONS="print_stacktrace=1 log_path=asan"ASan runtime does not come first in initial library list; you should either link runtime to your application or manually preload it with LD_PRELOAD.
って言われたら libasan.soがある場所を探して、LD_PRELOAD='/path/to/libasan.so'も付ける
- Vimを操作してみる
- 今回はtemplate string対応のデバッグなので、Vimで
:echo $'Hi ${"Vim"}'などしてみたり
- 今回はtemplate string対応のデバッグなので、Vimで
- カレントディレクトリに
asan\.[0-9]+なファイルができる- これが調査結果です！
完了！
なんでC言語を学ぶことが大切なのか？ 僕にはそれが答えられます。 Vim本体にコントリビュートできるようになるからです。
正しく検出できない？
結果が下記のように、明らかにVimへのチェックができていない感じになることがありました。
=================================================================
==12870==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 12 byte(s) in 1 object(s) allocated from:
#0 0x7f9b5fc79ada in __interceptor_malloc /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cc:144
#1 0x55fccd45ddde in xmalloc (/usr/bin/bash+0x80dde)
SUMMARY: AddressSanitizer: 12 byte(s) leaked in 1 allocation(s).僕の場合、gccではなくclangを使うようにしたら、うまくいきました。
$ export CC=${CC:-clang}
$ export CC_FOR_BUILD=${CC_FOR_BUILD:-clang}
$ make -j4 -e CFLAGS='-Wall'
$ cd src/testdir
$ make test_template_stringあるいは下記のissueのいずれかが参考になるかもしれません。
- Workarounds for #837 (Shadow memory range interleaves with an existing memory mapping. ASan cannot proceed correctly. ABORTING.) - Issue #856 - google/sanitizers - GitHub
- -fsanitize=address doesn't link libasan on Arch Linux - Issue #2488 - ldc-developers/ldc - GitHub
