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
はじめてのconsole.log
Search
Edward Fox
February 07, 2017
Technology
4
4.3k
はじめてのconsole.log
20170207
Meguro.es #8 発表資料
Edward Fox
February 07, 2017
Tweet
Share
More Decks by Edward Fox
See All by Edward Fox
Priorityを制するものはローディングを制す
edwardkenfox
4
460
Lambda@Edgeを利用したサードパーティJavaScriptのカナリアリリース / Canary release using Lamdba@Edge
edwardkenfox
0
50
AWS re:Invent 2019 / Hackathon for Good 参加録
edwardkenfox
2
440
Repro basketball club
edwardkenfox
0
170
Introduction to UX Optimizer
edwardkenfox
0
69
フロントエンド開発の落とし穴 / Fallacies of Client Side Programming (2019ver)
edwardkenfox
0
230
僕とprototypeとJSONで / Me and prototype down by the JSON
edwardkenfox
0
96
クライアントサイド開発の落とし穴 / Fallacies of Client Side Programming
edwardkenfox
0
290
Beacon API ことはじめ 〜そしてkeepalive fetchへ〜 / Beacon API The Basics
edwardkenfox
0
960
Other Decks in Technology
See All in Technology
チームでロジカルシンキングに改めて向き合っている話 〜学習環境と実践⽅法〜
sansantech
PRO
3
2.4k
検証を通して見えてきたTiDBの性能特性
lycorptech_jp
PRO
6
3.8k
Next'24 事例セッションの紹介とクラウド資格を活用したキャリア形成について語りMuscle
yasumuusan
1
440
Java EE/Jakarta EEの現状と将来―クラウドネイティブ時代にJava EEは対応できるのか?―
takakiyo
1
150
エンジニア候補者向け資料2024.04.24.pdf
macloud
0
3.3k
Building Dashboards as a Hobby
egmc
0
140
UIコンポーネント Vue3マイグレーション体験記
lycorptech_jp
PRO
0
110
Reducing Cross-Zone Egress at Spotify with Custom gRPC Load Balancing Recap
koh_naga
0
200
いつか使うかも貯金してたらめちゃめちゃ機能が増えてた話
riyaamemiya
0
130
家族アルバム みてねにおけるGrafana活用術 / Grafana Meetup Japan Vol.1 LT
isaoshimizu
1
670
EMとして2023年度に頑張ったこと / What we did well in FY2023 as a EM
pauli
1
170
Azure犬駆動開発の記録/GlobalAzureFukuoka2024_20240420
nina01
1
210
Featured
See All Featured
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
221
21k
Embracing the Ebb and Flow
colly
80
4.1k
Pencils Down: Stop Designing & Start Developing
hursman
117
11k
Debugging Ruby Performance
tmm1
70
11k
Build The Right Thing And Hit Your Dates
maggiecrowley
24
2k
Put a Button on it: Removing Barriers to Going Fast.
kastner
58
3k
The Cost Of JavaScript in 2023
addyosmani
16
3.9k
Code Reviewing Like a Champion
maltzj
514
39k
A Philosophy of Restraint
colly
197
16k
Building Effective Engineering Teams - LeadDev
addyosmani
28
1.8k
Bootstrapping a Software Product
garrettdimon
PRO
302
110k
Navigating Team Friction
lara
178
13k
Transcript
͡Ίͯͷconsole.log EDWARD FOX @Meguro.es 2017/02/07
Edward Fox - Developer @ Repro Inc. - RoR, JavaScript,
AWS - Vue.js, HTTP/2, WebAssembly
ಥવͰ͕͢Έͳ͞Μ
console.logɺͯ͠·͔͢ʁ
JSΛॻ͘ਓͰ console.logΛ࣮ߦͨ͜͠ͱ ͕ͳ͍ਓ͍ͳ͍Ͱ͢ΑͶ
ࠓ͢͜ͱ
consoleΦϒδΣΫτͷ ศརؔʹ͍ͭͯ
- console.tableͱ͔ - console.profileͱ͔
৭ʑ͋ΔͷͰάά͍ͬͯͩ͘͞
͓ΘΓ
Ͱͳ͘
ϒϥβͷΠϯεϖΫλʹ console.log(‘foo’)ͱೖྗͯ͠ ͔Βɺfooͱग़ྗ͞ΕΔ·Ͱ
None
None
ௐΔํ๏
1.ϒϥβͷιʔείʔυಡΉ 2. ϒϥβΛࣗલͰίϯύΠϧ ͯ͠ɺεςοϓ࣮ߦͯ͠͏
1.ϒϥβͷιʔείʔυಡΉ 2. ϒϥβΛࣗલͰίϯύΠϧ ͯ͠ɺεςοϓ࣮ߦͯ͠͏
ରWebKit ʢͷϛϥʔϦϙδτϦʣ https://github.com/WebKit/ webkit
C++ॳ৺ऀ͕งғؾͰಡΜ ͩͷͰɺؒҧ͍ͬͯͨΒڭ ͍͑ͯͩ͘͞ && ͍ͩͿં͍ͬͯΔͷ Ͱɺͦͷล͝צหΛ
ۦ͚Ͱ͍͖·͢
Ͳ͔͜ΒಡΉ͖͔ Θ͔Βͳ͍
ೖྗΛड͚औΔʹ ΠϯεϖΫλͷUI͕ඞཁ
WebInspectorUI
jsͰॻ͔Ε͍ͯΔ͔Β ׂͱαΫαΫಡΊΔ
ConsoleObserver͕ ϢʔβʔͷೖྗΛ ࢹ͍ͯ͠Δ
ೖྗΛؔ͢Δͱ LogManagerʹॲཧΛҕৡ
LogManager.messageWasAdded()
͜ͷmessageΛड͚औΔ ΠϯλʔϓϦλʔ͕͍Δ ͦͷ໊Interpreter
Interpreter͔Βઌ C++Ͱॻ͔Εͨ ϒϥβͷωΠςΟϒ࣮
Interpreter UI͔ΒͷೖྗΛ callFrameͱͯͬͯ͠Δ
callFrame = InterpreterΛ ίʔϧͨ͠ɺJSͷίʔυ ͦͷ࣮ߦڥͳͲ
InterpreterͰɺeval͕ؔ callFrameΛड͚औͬͯධՁ JSValueܕͷΛฦ͢
͜ͷͱ͖ ࣮ߦڥͷείʔϓʹͱ͍ͮͨ LexicalGlobalObjectͳͲੜ strict modeͰͷ࣮ߦͱ͔ ͜ͷ࣌Ͱผͯ͠ॲཧΛม͑Δ
console.logͱ͍͏ JSͷίʔυΛC++ͷؔʹ Ϛοϐϯάͯ͠ ࣮ߦ͢Δඞཁ͕͋Δ
େྔͷϚΫϩ
None
None
None
putDirectNativeFunction- WithoutTransition()
JSίʔυͷ࣮ߦঢ়ଶΛࣔ͢ ExecStateΛͱʹ࣮ߦ
JSC_HOST_CALLͱ͍͏ ϚΫϩ͕͋Δ if CPU(X86) && COMPILER(GCC_OR_CLANG) Έ͍ͨͳίʔυ͋ͬͯ ຯΘ͍ਂ͍
͔͜͜Βઌ ConsoleObjectΫϥε ͷίʔυΛ͍·͢
͞Βʹۦ͚Ͱ
consoleProtoFuncLog()
consoleLogWithLevel()
logWithLevel()
messageWithTypeAndLevel()
WTFLogAlways()
vprintf_stderr_with_trailing_ newline()
ʢϝιου໊ͷงғؾ͕ มΘͬͨ…ʁʣ
vprintf_stderr_common()
logToStderr()
fputs()
…!!!
ʹ͡Έग़Δ ϨΠϠʔײ
͕͜͜࠷ਂ෦͔ʁ
fputs()ͷ࣮ WebKitʹͳ͍
C++ʹ༻ҙ͞Ε͍ͯΔؔ
> ϑΝΠϧϙΠϯλfpʹ จࣈྻstrΛग़ྗͯ͠ ޭ͢ΕෛͰແ͍Λ ΤϥʔͰ͋ΕEOF(-1)Λฦ͢
ͭ·Γ
fputs()͢Δͱ ϑΝΠϧʢ͔Կ͔ʣͷ ग़ྗ৭Μͳͱ͜ΖΛ ܦ༝ͯ͠Χʔωϧͷ γεςϜίʔϧΛ࣮ߦ͢Δ
ग़ྗ͞Εͨ༰ ίʔϧ͞ΕͨؔΛ ͔͞ͷ΅ͬͯΛฦ͢
None
console.log(‘foo’) —— ೖྗͱೖྗΛड͚औΔڥք WebInspector ConsoleObserver LogManager messageWasAdded —— JSͱC++ͷڥք Interpreter#eval
JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION JSFunction::Create consoleProtoFuncLog consoleLogWithLevel logWithLevel messageWithTypeAndLevel printConsoleMessageWithArguments WTFLogAlways vprintf_stderr_with_trailing_newline vprintf_stderr_common logToStderr fputs —— C++ͱCͷڥք? many C++ & C implementations —— CͱΧʔωϧͷڥք? Kernel system call
console.log(‘foo’) —— ೖྗͱೖྗΛड͚औΔڥք WebInspector ConsoleObserver LogManager messageWasAdded —— JSͱC++ͷڥք Interpreter#eval
JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION JSFunction::Create consoleProtoFuncLog consoleLogWithLevel logWithLevel messageWithTypeAndLevel printConsoleMessageWithArguments WTFLogAlways vprintf_stderr_with_trailing_newline vprintf_stderr_common logToStderr fputs —— C++ͱCͷڥք? many C++ & C implementations —— CͱΧʔωϧͷڥք? Kernel system call
None
None
Θ͔ͬͨ͜ͱ
ϒϥβڊେͳ ϥϯλΠϜ+ίϯύΠϥ
[native code] ා͘ͳ͍
None
None
͓·͚ ʢ࣌ؒ͋ͬͨΒʣ
WebKitͷ δϫδϫ͘Δͱ͜Ζ
1. UIͷ෦͕es6Ͱ ॻ͔Ε͍ͯΔ
= 1ͭͷϦϙδτϦʹ es6ࣗମͷ࣮ͱ es6ͷίʔυͱ es6ͷlintϑΝΠϧ͕͋Δ
2. UIͷ෦ͷjsίʔυ͕ ͚ͬ͜͏console.assertΛ ͍ͬͯΔ
= ΫϥΠΞϯτͰى͖Δࣄ ৴༻Ͱ͖ͳ͍͠ ҉తͳܕมා͍͠ = ͦ͏ͩconsoleʹ ศརͳؔ͋Δ͔Β ͬͪΌ͓͏ͥ
3. rubyͱ͔pythonͷ εΫϦϓτ͕ͨ·ʹ͍Δ
= ։ൃऀ͕༻ҙͨ͠ Ϗϧυσόοά༻ͷ εΫϦϓτͳͲ = ͨͿΜ։ൃऀͷΈʹΑͬͯ rubyͱ͔pythonͰॻ͔Ε͍ͯΔ
͓͠·͍