Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Goでバイナリを読む+α
Search
Atsushi Takayama
June 14, 2018
Technology
1
940
Goでバイナリを読む+α
Fukuoka.go #10 で話した内容です。
#golang #go #webassembly #wasm
Atsushi Takayama
June 14, 2018
Tweet
Share
More Decks by Atsushi Takayama
See All by Atsushi Takayama
最高の開発者体験の追求が開発生産性を改善し続ける文化を生み出した話
edvakf
3
1.2k
NeurIPS 2021 論文読み会: How Modular should Neural Module Networks Be for Systematic Generalization?
edvakf
0
160
8年物のJavaのシステムをKotlinに変えていく選択に至るまで
edvakf
2
1.1k
ピクシブ社内のImageFlux利用事例紹介
edvakf
1
2.8k
学びの文化を育む社内読書会のススメ
edvakf
0
270
フルCDNアーキテクチャでサービス設計した話
edvakf
5
3.9k
お前はこれまでに作ったAPIの数を覚えているのか?
edvakf
0
2.5k
「ふつうのRailsアプリケーション」についての考え方
edvakf
2
830
ggplot.galleryというお遊びウェブアプリケーションを作った話
edvakf
0
400
Other Decks in Technology
See All in Technology
ソフトウェアは捨てやすく作ろう/Let's make software easy to discard
sanogemaru
10
5.8k
Introduction to Bill One Development Engineer
sansan33
PRO
0
240
コードの考古学 〜労務システムから発掘した成長の糧〜
kenta_smarthr
1
1.2k
NW運用の工夫と発明
recuraki
1
800
“⾞が通れるほど⼤きな”セキュリティーホールを抑えながらログインしたい
taiseiue
0
160
KMP導⼊において、マネジャーとして考えた事
sansantech
PRO
1
210
GitHub Coding Agent 概要
kkamegawa
1
1.7k
データ戦略部門 紹介資料
sansan33
PRO
1
3.1k
やさしいClaude Code入門
minorun365
PRO
32
25k
新卒から4年間、20年もののWebサービスと向き合って学んだソフトウェア考古学 - PHPカンファレンス新潟2025 / new graduate 4year software archeology
oguri
2
360
libsyncrpcってなに?
uhyo
0
160
大事なのは、AIの精度だけじゃない!〜1円のズレも許されない経理領域とAI〜
jun_nemoto
11
5.2k
Featured
See All Featured
The Pragmatic Product Professional
lauravandoore
35
6.7k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
19
1.3k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
26k
What’s in a name? Adding method to the madness
productmarketing
PRO
22
3.5k
Code Review Best Practice
trishagee
68
18k
StorybookのUI Testing Handbookを読んだ
zakiyama
30
5.8k
Designing Experiences People Love
moore
142
24k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
42
2.3k
Raft: Consensus for Rubyists
vanstee
137
7k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
32
2.3k
Build The Right Thing And Hit Your Dates
maggiecrowley
35
2.7k
Transcript
GoͰόΠφϦΛಡΉ +α Fukuoka.go #10 pixiv.inc Atsushi Takayama
• ߴࢁԹ / edvakf ϐΫγϒגࣜձࣾ ࣥߦһCTO ݉ ԬΦϑΟεϚωʔδϟʔ • Go,
Ruby, JavaScript, Scala, PHP ࣗݾհ
func init() {
GoͰόΠφϦΛಡΉ ͱ͍͏ྫΛݩʹɺGoͷ͜ͱΛΖ͏
όΠφϦΛಡΊΔͱ
ΧοίΠΠ
% cat testdata/hello.wasm | xxd -g1 | head
-n 30 00000000: 00 61 73 6d 0d 00 00 00 01 ae 83 80 80 00 30 60 .asm..........0` 00000010: 01 7f 01 7f 60 03 7f 7f 7f 01 7f 60 01 7c 01 7f ....`......`.|.. 00000020: 60 02 7f 7f 01 7f 60 03 7f 7f 7f 00 60 05 7f 7f `.....`.....`... 00000030: 7f 7f 7f 01 7f 60 08 7f 7f 7f 7f 7f 7f 7f 7f 01 .....`.......... 00000040: 7f 60 01 7f 00 60 06 7f 7f 7f 7f 7f 7f 01 7f 60 .`...`.........` 00000050: 02 7f 7f 00 60 04 7f 7f 7f 7f 01 7f 60 00 00 60 ....`.......`..` 00000060: 04 7f 7f 7f 7f 00 60 06 7f 7f 7f 7f 7f 7f 00 60 ......`........` 00000070: 05 7f 7f 7f 7f 7f 00 60 07 7f 7f 7f 7f 7f 7f 7f .......`........ 00000080: 01 7f 60 06 7f 7f 7f 7f 7f 7c 01 7f 60 05 7f 7f ..`......|..`... 00000090: 7e 7f 7f 00 60 0b 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f ~...`........... 000000a0: 7f 01 7f 60 0f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f ...`............ 000000b0: 7f 7f 7f 7f 00 60 03 7f 7f 7f 01 7d 60 07 7f 7f .....`.....}`... 000000c0: 7f 7f 7f 7f 7f 00 60 0a 7f 7f 7f 7f 7f 7f 7f 7f ......`......... 000000d0: 7f 7f 00 60 03 7f 7f 7f 01 7c 60 00 01 7f 60 04 ...`.....|`...`. 000000e0: 7f 7f 7f 7f 01 7e 60 05 7f 7f 7f 7f 7e 01 7f 60 .....~`.....~..` 000000f0: 05 7f 7f 7f 7f 7c 01 7f 60 0c 7f 7f 7f 7f 7f 7f .....|..`....... 00000100: 7f 7f 7f 7f 7f 7f 01 7f 60 10 7f 7f 7f 7f 7f 7f ........`.......
;Ή;Ή
}
func main() {
͜͏ͬͯಡΉͷਏ͍ͷͰ
ߏମʹϚοϐϯά͠·͢
type Module struct { Header ModuleHeader Sections []Section
} type ModuleHeader struct { Magic [4]byte Version uint32 } type Section struct { ... }
ͪΖΜ͏ͷ
type Reader interface { Read(p []byte) (n int,
err error) } ετϦʔϜΛҙࣝ͢Δͱ͖ io.Reader Λ͏ io.Reader
// 4όΠτΛio.Reader͔ΒಡΈࠐΉ var buf [4]byte num, err :=
r.Read(buf[:]) [4]byte ʮྻʯ buf[0:4] ͱ͔ buf[:] ͰྻͷҰ෦ͷϙΠϯλʔΛؚΉʮεϥΠεʯ ReadʹͤΔͷʮεϥΠεʯ NόΠτಡΉ
import "encoding/binary" var num int64 err := binary.Read(r,
binary.LittleEndian, &num) binary.Read ͷୈࡾҾ interface{} ৭ΜͳܕͷϙΠϯλʔ͕ͤΔ int/floatΛಡΉ
int/float͚ͩͰͳ͘
b := []byte{0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21,
0x09, 0x40, 0xff, 0x01, 0x02, 0x03, 0xbe, 0xef} r := bytes.NewReader(b) var data struct { PI float64 Uate uint8 Mine [3]byte Too uint16 } err := binary.Read(r, binary.LittleEndian, &data) ߏମΛؙ͝ͱಡΉ
binary.Readศར
fmt.Printf("%v\n", data) // => {3.141592653589793 255 [1 2
3] 61374} fmt.Printf("%+v\n", data) // => {PI:3.141592653589793 Uate:255 Mine:[1 2 3] Too:61374} fmt.Printf("%#v\n", data) // => struct { PI float64; Uate uint8; Mine [3]uint8; Too uint16 }{PI: 3.141592653589793, Uate:0xff, Mine:[3]uint8{0x1, 0x2, 0x3}, Too:0xefbe} fmtͷ%v
LLฒͷ͍উख
Α͘ݴΘΕΔGoͷັྗ
ඪ४ϥΠϒϥϦ͕γϯϓϧ͔ͭڧྗ ͓Θ͔Γ͍͚ͨͩͨͩΖ͏͔ʁ
Α͘ݴΘΕΔGoͷܽ
Τϥʔॲཧ͕DRY͡Όͳ͍
var buf [4]byte num, err := r.Read(buf[:]) if
err != nil { // Τϥʔॲཧ } var num int64 err = binary.Read(r, binary.LittleEndian, &num) if err != nil { // Τϥʔॲཧ } err = binary.Read(r, binary.LittleEndian, &data) if err != nil { // Τϥʔॲཧ
type decoder struct { r io.Reader err error
} func (d *decoder) read(r io.Reader, buf []byte) { if d.err != nil || len(buf) == 0 { return } _, d.err = r.Read(buf) } // https://github.com/sbinet/wasm/blob/master/decoder.go
• Rob Pikeઌੜᐌ͘ɺ • Errors are values (ΤϥʔͨͩͷฦΓ)
• Τϥʔྫ֎ͱҧ͏ɻνΣοΫ͢ΔͷͰͳ͘ɺ దʹॲཧͤΑ • https://youtu.be/PAAkCSZUG1c?t=16m14s
}
ͦͦԿ࡞ͬͯΔͷʁ
WebAssemblyʹৄ͘͠ͳΓ͔ͨͬͨ
• CGoΛWasmʹίϯύΠϧ͢ΔͷطʹͰ͖Δ • ࠓޙͨ͘͞Μͷݴޠ͕WasmʹίϯύΠϧͰ͖ΔΑ͏ ʹͳΔͣ • Goͷ্ͰWasmΛ࣮ߦ͢ΔະདྷདྷΔͣ
Wasm→Ruby ISeqίϯύΠϥʔ mRuby→WasmίϯύΠϥʔ
Ӷҙ࡞த
• https://github.com/edvakf/wasm • https://github.com/edvakf/wagyu • ͠ͳͯ͘ɺ࣮༻త͡Όͳͯ͘ɺษڧ͢Δ͜ͱ ࣗମָ͕͚͠Ε͍͍ɻͦΜͳϓϩάϥϜΛॻ͜͏ͱ ࢥͬͯͬͯ·͢ɻ
os.Exit(0)