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
I finally understand instance_eval
Search
Sponsored
·
Your Podcast. Everywhere. Effortlessly.
Share. Educate. Inspire. Entertain. You do you. We'll handle the rest.
→
Masafumi Okura
February 01, 2020
Programming
390
1
Share
Embed
Copy iframe code
Copy JS code
Copy link
Start on current slide
I finally understand instance_eval
Masafumi Okura
February 01, 2020
More Decks by Masafumi Okura
See All by Masafumi Okura
Conference as a communication hub for all of us
okuramasafumi
0
68
Metaprogramming isn't real, it can't hurt you
okuramasafumi
0
170
Developing static sites with Ruby
okuramasafumi
1
450
Why doesn't Ruby have Boolean class - final version
okuramasafumi
0
420
Reading Rails 1.0 Source Code
okuramasafumi
0
380
RDoc meets YARD
okuramasafumi
4
280
Why doesn't Ruby have Boolean class?
okuramasafumi
0
65
My KaigiEffect at RubyKaigi 2025, part 1
okuramasafumi
1
120
Writing documentation can be fun with plugin system
okuramasafumi
0
280
Other Decks in Programming
See All in Programming
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
380
act2-costs.pdf
sumedhbala
0
120
地域 SRE コミュニティ最前線 - ホンマでっかSRE勉強会
tk3fftk
0
270
『コードを書く以外の』エンジニアリング〜課金基盤移行プロジェクト推進のためのTips4選
yuriko1211
0
540
【やさしく解説 設計編・中級 #6】良いアーキテクチャとは ~ 一本の登り道の、行き先 ~
panda728
PRO
0
180
Lean は証明の正しさを確認するためだけのツールって思ってませんか?
inoueasei
1
110
2年かけて Deno に DOMMatrix を実装した話 / How I implemented DOMMatrix in Deno over two years
petamoriken
0
120
はてなアカウント基盤 State of the Union
cockscomb
1
1.3k
数百円から始めるRuby電子工作
tarosay
0
100
ルールを書いて終わらせないハーネスエンジニアリング
yug1224
4
1.7k
使用 Meilisearch 建立新聞搜尋工具
johnroyer
0
170
GitHubCopilotCLIのスラッシュコマンドを自作してみる
htkym
0
100
Featured
See All Featured
Evolving SEO for Evolving Search Engines
ryanjones
0
240
Context Engineering - Making Every Token Count
addyosmani
9
1k
Crafting Experiences
bethany
1
230
Building a Scalable Design System with Sketch
lauravandoore
463
34k
Making Projects Easy
brettharned
120
6.7k
Mind Mapping
helmedeiros
PRO
1
290
DBのスキルで生き残る技術 - AI時代におけるテーブル設計の勘所
soudai
PRO
67
56k
Why Our Code Smells
bkeepers
PRO
340
58k
We Analyzed 250 Million AI Search Results: Here's What I Found
joshbly
1
1.6k
Lessons Learnt from Crawling 1000+ Websites
charlesmeaden
PRO
1
1.4k
Visual Storytelling: How to be a Superhuman Communicator
reverentgeek
2
590
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
287
14k
Transcript
instance_evalશʹཧ ղͨ͠ɿinstance_exec ΕΔͳฤ Speaker: େխ࢙ Event: Burikaigi2020 Date: 2020-02-01
self.inspect • ໊લɿେխ࢙ • ॴଐɿϑϦʔϥϯε • Rubyྺɿ7 • ͖ͳΤσΟλɿVim
self.inspect • ࠷ۙͷ՝ɿ໊ͱϚελεϥΠυͷσβΠ ϯΛͲ͏͢Δ͔ • झຯɿᘖᘣΛᔸΕΔʢࠓϑϨϯνϓϨεʣ • ͖ͳϝιουɿinstance_eval <- ࠓͷ
͡Ίʹ
͜ͷτʔΫʹ͍ͭͯʢϝλʣ • εϥΠυຕɿ29ຕ • ࣌ؒɿ25 • ओͳλʔήοτɿϝλϓϩάϥϛϯάॳ৺ऀ ͔Βதڃऀ • σϞ༗Γ
·͓ͣ͞Β͍
instance_eval ͱ • evalͷ1ͭͰɺҙͷΦϒδΣΫτ ʢBasicObjectؚΉʣͷίϯςΩετͰจࣈྻ ͷධՁ·ͨϒϩοΫͷ࣮ߦ͕Մೳ • DSLͷߏஙͳͲʹଟ༻͞ΕΔ • RubyͷॊೈੑΛࢧ͍͑ͯΔʢݸਓͷݟղʣ
ॳֶऀ͚ิɿධՁͬͯʁ • evalจࣈྻΛRubyͷίʔυʹݟཱ࣮ͯͯ ߦ͢Δ • irb͕͍ͬͯΔ͜ͱɺͱ͍͏ͱΠϝʔδ͠ ͍͔͢ • ධՁӳޠͰevaluationͳͷͰॖΊͯeval
ॳֶऀ͚ิɿϒϩοΫ • ϒϩοΫͷதͷίʔυ͙͢ʹ࣮ߦ͞Εͳ ͍ʢίʔϧόοΫ͞ΕΔɺͱݴ͏ʣ • ϒϩοΫͦͷ··ͰมೖͰ͖ͳ͍ ͕ɺ&blockͳͲͰड͚ͨͷೖՄೳ • ϒϩοΫΛݺͼग़͢ʢcallͱ͔yieldͱ͔ʣͱ ͖ɺҾΛ͢ͱͦΕ͕ϒϩοΫҾʹͳΔ
instance_evalͱଞͷeval Ͳ͏ҧ͏ͷ͔ • evalจࣈྻ͔͠ධՁͰ͖ͳ͍ʢϒϩοΫΛ࣮ ߦͰ͖ͳ͍ʣ • class_evalධՁͷίϯςΩετ͕ҧ͏ • ʢevalͰͳ͍͚Ͳʣinstance_execจࣈྻ ͷධՁ͕Ͱ͖ͳ͍ʢϒϩοΫͷ࣮ߦ͔͠Ͱ͖ͳ
͍ʣɺϒϩοΫҾ͕ͤΔ
σϞͱ͍͏͔؆୯ͳ͍ํ
σϞ͔ΒΘ͔Δ͜ͱ • instance_evalʹͨ͠ϒϩοΫͰselfϨ γʔόΛࢦ͍ͯ͠Δ • ͳͷͰɺϒϩοΫͰselfΛলུ͢ΔͱϨγʔό ͷϝιου͕ݺΔ • self͕লུͰ͖ΔͷͰϓϥΠϕʔτϝιουΠ ϯελϯεมΞΫηε͠์
ެࣜυΩϡϝϯτΛಡΉ
ެࣜυΩϡϝϯτΛಡΉ • https://docs.ruby-lang.org/en/2.7.0/ BasicObject.html#method-i-instance_eval • https://docs.ruby-lang.org/ja/2.7.0/class/ BasicObject.html#I_INSTANCE_EVAL • ༨ஊͳ͕Βɺinstance_evalBasicObjectʹੜ ͍͑ͯΔ
ཁ͢ΔʹԿ͕ॻ͍ͯ͋Δͷ͔ • จࣈྻΛड͚Δͱ͖ͱϒϩοΫΛड͚Δͱ͖ ͱͰڍಈ͕ҧ͏ʢͨΓલʣ • จࣈྻΛड͚Δͱ͖جຊతʹevalͱಉ͡ಈ ͖Λ͢Δ • ϒϩοΫΛड͚Δͱ͖ϒϩοΫΛ࣮ߦ͢Δ ࡍʹϒϩοΫҾʹϨγʔόΛ͢
ॏཁͳ͜ͱ • ϒϩοΫʹҾΛͤͳ͍ • ϒϩοΫʹҾΛͤͳ͍ <-େࣄͳ͜ͱ • DSLΛߏங͢Δࡍʹ͍ͮΒ͍ͱ͖͕͋Δ
࣮ྫ
࣮ྫσϞ͔ΒΘ͔ͬͨ͜ͱ • instance_evalͱinstance_execڍಈ͕ҟͳ Γɺ༻్·ͨҟͳΔ • instance_execड͚ͨϒϩοΫͷҾʹҙͷ ΦϒδΣΫτΛͤΔ • ϒϩοΫΛ࣮ߦ͢Δ͚ͩͳΒinstance_execͷ΄ ͏͕͍͍ͷ͔ʁ
ͪΐͬͱ͓͠Ζ͍
ಛҟʢγϯάϧτϯʣϝιου • Πϯελϯεʹ͔͠ఆٛ͞Ε͍ͯͳ͍ϝιο υ • instance_evalΛ͏ͱେྔੜ͕؆୯ • ࣮ΫϥεϝιουͱݺΕ͍ͯΔͷ͜ ͷҰछ
ಛҟϝιουΛੜͯ͠ΈΔ
instance_evalͰdef͕ݺΔ • Կ͕ى͖͍ͯΔͷͩΖ͏͔ • ͦͷṖΛ໌Β͔ʹ͘͢ɺզʑRubyͷԞ ʢιʔείʔυʣͱཱཱྀͬͨ…
RubyͷιʔείʔυΛಡΉ
ιʔείʔυ͔ΒΘ͔Δ͜ͱ • CݴޠͰॻ͍ͯ͋ΔʢͦΕͦ͏ʣ • vm_eval.cͱ͍͏ϑΝΠϧʹinstance_evalͷ࣮ ͕͋Δ • execution_contextͱ͍͏ͷ͕ॏཁͦ͏
͍͠
RubiniusΛಡΜͰΈΔ
Rubiniusͷinstance_evalΑΓ • RubyͷϒϩοΫ࣮ߦʹ͓͍ͯείʔϓඇৗ ʹॏཁʢʰϝλϓϩάϥϛϯάRubyʱಡ ͏ʣ • CRubyͱಡΈൺΔͱ͍͍͔
·ͱΊ
instance_evalָ͍͠