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
The State of AssemblyScript 2018
Search
kazupon
December 14, 2018
Programming
2
1k
The State of AssemblyScript 2018
kazupon
December 14, 2018
Tweet
Share
More Decks by kazupon
See All by kazupon
わたしのOSS活動
kazupon
3
510
Vapor Revolution
kazupon
3
3.6k
Vue.js最新動向
kazupon
3
1.6k
Vue 3.4
kazupon
13
4.7k
Vue & Vite Rustify
kazupon
4
2.3k
Vue.jsエコシステム動向2023
kazupon
17
7.9k
Reactivity Transform
kazupon
1
1.4k
わたしのOSS活動
kazupon
1
1k
Vue with Vite
kazupon
2
2.6k
Other Decks in Programming
See All in Programming
Vibe coding コードレビュー
kinopeee
0
460
マイコンでもRustのtestがしたい その2/KernelVM Tokyo 18
tnishinaga
2
2.3k
AIレビュアーをスケールさせるには / Scaling AI Reviewers
technuma
2
230
モバイルアプリからWebへの横展開を加速した話_Claude_Code_実践術.pdf
kazuyasakamoto
0
250
実践!App Intents対応
yuukiw00w
1
340
レガシープロジェクトで最大限AIの恩恵を受けられるようClaude Codeを利用する
tk1351
2
730
TDD 実践ミニトーク
contour_gara
0
140
🔨 小さなビルドシステムを作る
momeemt
1
390
CEDEC 2025 『ゲームにおけるリアルタイム通信への QUIC導入事例の紹介』
segadevtech
3
960
Claude Code と OpenAI o3 で メタデータ情報を作る
laket
0
140
画像コンペでのベースラインモデルの育て方
tattaka
3
1.8k
「リーダーは意思決定する人」って本当?~ 学びを現場で活かす、リーダー4ヶ月目の試行錯誤 ~
marina1017
0
240
Featured
See All Featured
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
48
9.6k
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.6k
Building Better People: How to give real-time feedback that sticks.
wjessup
367
19k
Building a Modern Day E-commerce SEO Strategy
aleyda
43
7.5k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
Build your cross-platform service in a week with App Engine
jlugia
231
18k
The World Runs on Bad Software
bkeepers
PRO
70
11k
Documentation Writing (for coders)
carmenintech
73
5k
How STYLIGHT went responsive
nonsquared
100
5.7k
The Pragmatic Product Professional
lauravandoore
36
6.8k
Designing for humans not robots
tammielis
253
25k
Transcript
The State of AssemblyScript 2018 Emscripten & WebAssembly Night #6
2018.12.14 @kazupon
Who am I ?
CTO Vue.js Core Team Vue.js japan users group organizer vue-i18n
author WebAssembly Love ❤ @kazu_pon kazupon kazupon
Introduction
Last a year …
https://qiita.com/chikoski/items/d98ed0a98acfa896869f
https://qiita.com/kazupon/items/37e1ee9db0ca5419c517
One year has passed.
During this time, AssemblyScript evolves little by little.
Today Contents About recently updates of AssemblyScript
ATTENTION !! • AssemblyScript v5 is WIP (Not published in
NPM) • It might be changed in future
What is AssemblyScript?
Compile a strictly-typed subset of TypeScript to WebAssembly
Recently updates from last year
Hot topics •Memory management •AssemblyScript loader •GC Implementation
Memory Management
Kind of allocators • allocator/arena • allocator/tlsf • allocator/buddy •
allocator/system HEAP_BASE (the first 8 byte aligned offset after static) Static Heap Memory
• Accumulates memory with no mechanism to free specific segments
allocator/arena Static Allocated memory.allocate(1024) startOffset offset 64KB (page x) Allocatable Heap region Memory
• Simply increase the memory size, when memory size will
be about to fill. allocator/arena Static Allocated memory.allocate(1024) startOffset offset 64KB Memory memory.grow(2) 128KB
• when memory.reset, resets the counting memory offset to its
initial value and starts all over again. allocator/arena Static Heap memory.reset() startOffset offset 128KB Memory 64KB
allocate / free of memory
• You can use your custom memory allocator ! allocator/system
Memory Layout • String e.g. const str: string = ‘Hello’
Memory Layout • Arrays: All arrays store their contents in
an ArrayBuffer behind the scenes.
Memory Layout • ArrayBuffer layout
AssemblyScript loader
What is it? • Provide some APIs of convenient AssemblyScript
modules loading • Demangles module • Exports to a friendly object structure compatible WebIDL and TypeScript definitions for JS env • Some useful utilities as helper API, to read/write data from/to memory
Demangles module structure add Point thisPtr x (getter/setter) y (getter/setter)
add (method) I8 U8 I16 U16 I32 U32 I64 U64 F32 F64 Static Heap WASM module Demangles module Wrap Wrap Return the pointer Memory Ref newString getString … Utilities
How to use demangles module Static Heap Memory 32 64
0x00010000 p1 0x00010008 thisPtr 0x00010000 x y pass the pointer pass the pointer 0x00000000
Working with strings and arrays • ex: object path parser
Reading/writing basic values to/from memory https://github.com/AssemblyScript/assemblyscript/tree/master/lib/loader#readingwriting-basic-values-tofrom-memory Static Heap Memory FF
FF 0x00010000 ptr: 0x00010000 0x00010001 U8 0x00000000 U16
GC implementation
Experimental !! https://github.com/AssemblyScript/assemblyscript/pull/196
Manually GC release
GC related issues • GC experimentation • GitHub Issue Number:
#89 • Implement reference counting and/or garbage collection • GitHub Issue Number: #16
In future …
Status / Roadmap • Standard library comatibility • TypeScript comatiplity
• WASM features • Managed object runtime https://next.assemblyscript.org/#/development/roadmap
Closing
Closing •AssemblyScript is steadily evolving •Memory management •AssemblyScript loader •GC
Implementation •It has a potential as WASM app implementation language!
Thanks!