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The State of AssemblyScript 2018
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kazupon
December 14, 2018
Programming
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The State of AssemblyScript 2018
kazupon
December 14, 2018
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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!