The State of AssemblyScript 2018

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The State of AssemblyScript 2018 Emscripten & WebAssembly Night #6 2018.12.14 @kazupon

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Who am I ? 

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CTO  Vue.js Core Team Vue.js japan users group organizer vue-i18n author WebAssembly Love ❤ @kazu_pon kazupon kazupon

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Introduction

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Last a year …

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https://qiita.com/chikoski/items/d98ed0a98acfa896869f

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https://qiita.com/kazupon/items/37e1ee9db0ca5419c517

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One year has passed.

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During this time, AssemblyScript evolves little by little.

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Today Contents    About recently updates of AssemblyScript

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ATTENTION !! • AssemblyScript v5 is WIP  (Not published in NPM) • It might be changed in future

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What is AssemblyScript?

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Compile a strictly-typed subset of TypeScript to WebAssembly

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Recently updates from last year

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Hot topics •Memory management •AssemblyScript loader •GC Implementation

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Memory Management

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Kind of allocators • allocator/arena • allocator/tlsf • allocator/buddy • allocator/system HEAP_BASE (the ﬁrst 8 byte aligned offset after static) Static Heap Memory

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• 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

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• 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

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• 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

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allocate / free of memory

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• You can use your custom memory allocator ! allocator/system

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Memory Layout • String  e.g. const str: string = ‘Hello’

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Memory Layout • Arrays: All arrays store their contents in an ArrayBuffer behind the scenes.

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Memory Layout • ArrayBuffer layout

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AssemblyScript loader

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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

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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

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How to use demangles module Static Heap Memory 32 64 0x00010000 p1 0x00010008 thisPtr 0x00010000 x y pass the pointer pass the pointer 0x00000000

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Working with strings and arrays • ex: object path parser

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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

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GC implementation

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Experimental !! https://github.com/AssemblyScript/assemblyscript/pull/196

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Manually GC release

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GC related issues • GC experimentation • GitHub Issue Number: #89 • Implement reference counting and/or garbage collection • GitHub Issue Number: #16

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In future …

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Status / Roadmap • Standard library comatibility • TypeScript comatiplity • WASM features • Managed object runtime https://next.assemblyscript.org/#/development/roadmap

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Closing

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Closing •AssemblyScript is steadily evolving •Memory management •AssemblyScript loader •GC Implementation •It has a potential as WASM app implementation language!

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Thanks!