The State of AssemblyScript 2018

Transcript

1. The State of AssemblyScript 2018 Emscripten & WebAssembly Night #6 2018.12.14 @kazupon
2. Who am I ?

3. CTO
 Vue.js Core Team Vue.js japan users group organizer vue-i18n author WebAssembly Love ❤ @kazu_pon kazupon kazupon
4. Introduction
5. Last a year …
6. https://qiita.com/chikoski/items/d98ed0a98acfa896869f
7. https://qiita.com/kazupon/items/37e1ee9db0ca5419c517
8. One year has passed.
9. During this time, AssemblyScript evolves little by little.
10. Today Contents
 
 About recently updates of AssemblyScript
11. ATTENTION !! • AssemblyScript v5 is WIP
 (Not published in NPM) • It might be changed in future
12. What is AssemblyScript?
13. Compile a strictly-typed subset of TypeScript to WebAssembly
14. Recently updates from last year
15. Hot topics •Memory management •AssemblyScript loader •GC Implementation
16. Memory Management
17. Kind of allocators • allocator/arena • allocator/tlsf • allocator/buddy • allocator/system HEAP_BASE (the first 8 byte aligned offset after static) Static Heap Memory
18. • 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
19. • 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
20. • 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
21. allocate / free of memory
22. • You can use your custom memory allocator ! allocator/system
23. Memory Layout • String
 e.g. const str: string = ‘Hello’
24. Memory Layout • Arrays: All arrays store their contents in an ArrayBuffer behind the scenes.
25. Memory Layout • ArrayBuffer layout
26. AssemblyScript loader
27. 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
28. 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
29. How to use demangles module Static Heap Memory 32 64 0x00010000 p1 0x00010008 thisPtr 0x00010000 x y pass the pointer pass the pointer 0x00000000
30. Working with strings and arrays • ex: object path parser
31. 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
32. GC implementation
33. Experimental !! https://github.com/AssemblyScript/assemblyscript/pull/196
34. Manually GC release
35. GC related issues • GC experimentation • GitHub Issue Number: #89 • Implement reference counting and/or garbage collection • GitHub Issue Number: #16
36. In future …
37. Status / Roadmap • Standard library comatibility • TypeScript comatiplity • WASM features • Managed object runtime https://next.assemblyscript.org/#/development/roadmap
38. Closing
39. Closing •AssemblyScript is steadily evolving •Memory management •AssemblyScript loader •GC Implementation •It has a potential as WASM app implementation language!
40. Thanks!