The state of Swift for WebAssembly in 2022

https://fortee.jp/iosdc-japan-2022/proposal/fa87f700-1483-456b-9b28-ba7c119cfa69

Transcript

1. The state of Swift for WebAssembly in 2022
   iOSDC 2022
   @kateinoigakukun
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2. About Me
   • @kateinoigakukun
   • Working at GoodNotes
   • SwiftWasm ͷϝϯςφ
   • ৽ถ Swift / CRuby / LLVM
   ίϛολ
   • Love Swift
   !
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3. About this talk
   1. Ϟνϕʔγϣϯ
   2. SwiftWasm ͷϢʔεέʔε & σϞ
   3. աڈ2೥ͷਐḿ
   4. Future Work
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4. Ϟνϕʔγϣϯ
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5. Swiftͷ޷͖ͳͱ͜Ζ
   • ίϯύΠϧ͕௨Ε͹େମಈ͘
   • ਖ਼͍͠ίʔυΛ؆୯ʹॻͨ͘ΊͷIDEࢧԉ
   • ॊೈͳܕγεςϜ
   • ஋ܕࢦ޲
   • ConcurrencyͰਅՁΛൃش
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6. SwiftͰ΍Γ͍ͨ͜ͱ
   Run Swift anywhere
   • Webϒϥ΢βͰಈ͘Swift
   • AndroidͰಈ͘Swift
   • Ϋϥ΢υϓϥοτϑΥʔϜͰಈ͘Swift
   • SwiftͰॻ͚ΔϢʔβϓϥάΠϯ (e.g. VSCode Extension)
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7. WebAssembly is a game changer
   A binary instruction format for a stack-based machine
   Designed to be
   • Portable
   • Size- and Load-time efficient
   • Secure by Sandbox
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8. WebAssemblyͷ࣮ߦϑϩʔ
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9. SwiftWasm Project
   https://swiftwasm.org
   SwiftͷWebAssemblyରԠΛਐΊΔϓϩδΣΫτ
   • ίϯύΠϥΛ௚ͯ͠ύονΛૹͬͨΓɺ
   • WebAssembly޲͚ͷπʔϧνΣΠϯΛ഑෍ͨ͠Γɺ
   • JavaScriptKitͳͲͷपลϥΠϒϥϦͷ։ൃ
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10. Demo: Run Swift on browser
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13. ϓϩμΫγϣϯͰͷSwiftWasmͷϢʔεέʔε
    • GoodNotes1
    • Note-taking app
    • Web Viewer for sharing
    • Luminal2
    • Python notebook on
    browser
    2 https://getluminal.com/
    1 https://www.goodnotes.com/
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14. GoodNotesͷϨϯμϥ͕Web
    Ͱಈ͍ͯΔ༷ࢠ
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15. WebAssembly is not only for Web
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16. WebAssembly is not only for Web
    • αϯυϘοΫεʹΑΔ҆શੑɺϙʔλϒϧͳΞʔΩςΫνϟɺ
    ଟݴޠαϙʔτ͸ଞͷ෼໺Ͱ΋خ͍͠
    • ServerlessϓϥοτϑΥʔϜ
    • ϓϥάΠϯγεςϜ
    • and more…
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17. WASI (WebAssembly System Interface)
    WebҎ֎Ͱ΋WasmΛಈ͔ͨ͢Ίͷඪ४γεςϜίʔϧن໿
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18. https://hacks.mozilla.org/2019/03/standardizing-wasi-a-webassembly-system-interface/ 18
    

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19. https://hacks.mozilla.org/2019/03/standardizing-wasi-a-webassembly-system-interface/ 19
    

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20. WASI compatible things
    Platforms
    • Node.js / Deno / Wasmtime
    • Fastly Compute@Edge
    • Cloudflare Workers
    • VSCode Extensions
    • Fluent Bit
    • Etc…
    Languages
    • C / C++
    • Rust
    • Swift
    • Ruby
    • Etc…
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21. Wasm͸ಈ͔͢؀ڥ΋ίϯύΠϥ΋خ͍͠
    • ಈ͔͢ଆ: WebAssemblyϥϯλΠϜ͑͋͞Ε͹ɺ༷ʑͳݴޠΛ
    αϙʔτ͢Δ͜ͱ͕Ͱ͖Δ
    • ίϯύΠϥଆ: WebAssemblyʹίϯύΠϧͰ͖Ε͹ɺ༷ʑͳ؀
    ڥͰಈ͔ͤΔ
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22. Demo: Swift CLI on WebAssembly
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24. Web Ҏ֎ͷSwiftWasmͷϢʔεέʔε
    • Fastly Compute@Edge3
    • Serverless platform based on WebAssembly
    • Enarx4
    • WebAssembly + Confidential Computing on TEE
    (Trusted Execution Environment)
    4 https://enarx.dev/docs/webassembly/swift
    3 https://www.fastly.com/jp/blog/introducing-serverless-swift-building-on-compute-edge-with-andrew-barba
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25. Demo: Swift at Compute@Edge
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27. For more info
    https://swift.cloud/blog/deploy-server-side-swift-to-fastly
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28. ٕज़తͳਐḿ (2020~2022)
    • Relative PointerαϙʔτΛWasmʹ௥Ճ
    • 70Ҏ্ͷύονΛΞοϓετϦʔϜʹϚʔδ
    • Swift ConcurrencyʹରԠ
    • Tokamak Fiber Renderer
    • μWASI
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29. Relative Pointer
    SwiftͰ࢖ΘΕ͍ͯΔϙΠϯλදݱͷςΫχοΫ
    • 64bit؀ڥͰ΋32bitʹऩ·Δ
    • → όΠφϦαΠζخ͍͠
    • Ґஔಠཱ
    • → ʢେࡶ೺ʹݴ͏ͱʣ
    ΞϓϦىಈ͕଎ͯ͘خ͠
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30. Relative Pointer
    • Wasmͷ࢓༷Ͱ͸දݱͰ͖ͳ͔ͬͨ
    template
    uintptr_t applyRelativeOffset(BasePtrTy *basePtr, Offset offset) {
    #ifdef __wasm__
    // WebAssembly: hack: disable relative pointers
    return (uintptr_t)(intptr_t)offset;
    #endif
    auto base = reinterpret_cast(basePtr);
    auto extendOffset = (uintptr_t)(intptr_t)offset;
    return base + extendOffset;
    }
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31. Relative Pointer
    ϋοΫ͸ਏ͍
    • ίϯύΠϥͱϥϯλΠϜ྆ํʹେྔͷมߋ͕ඞཁ
    • ΞοϓετϦʔϜͰ৽͘͠Relative Pointerͷ࢖༻͕૿͑Δͨͼ
    ʹέΞ͕ඞཁ
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32. WasmʹRelative PointerαϙʔτΛ௥Ճ
    • WasmଆʹRelative Pointer
    ʹඞཁͳػೳΛఏҊ&࣮૷
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33. WebAssemblyͷͨΊʹSwiftΛ௚͢
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34. WebAssemblyͷͨΊʹSwiftΛ௚͢
    SwiftͷͨΊʹWebAssemblyΛ௚͢
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35. ϋοΫ͕ফͤͯϋοϐʔ
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36. Upstreaming patches
    • 44 patches for apple/swift
    • 16 patches for apple/swift-corelibs-foundation
    • 14 patches for apple/swift-package-manager
    • 4 patches for LLVM
    They are made by only 2 people!
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37. Swift Concurrency on Wasm
    JavaScriptKit provides a global executor implementation based on
    JS event-loop
    import JavaScriptEventLoop
    import JavaScriptKit
    JavaScriptEventLoop.installGlobalExecutor()
    func printZen() async throws {
    let fetch = JSObject.global.fetch.function!
    let response = try await JSPromise(fetch("https://api.github.com/zen").object!)!.value
    let text = try await JSPromise(response.text().object!)!.value
    print(text)
    }
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38. Tokamak Fiber Renderer
    • React 16Ҏ߱ͱಉ౳ͷΞϧΰϦζϜ
    • ਂ͘ωετͨ͠ViewͰ΋ελοΫΦʔόʔϑϩʔ͕ى͖ͳ͍
    • ͜Ε·ͰͷStack Reconciler͸30 viewsͷωετͰ
    ελοΫΦʔόʔϑϩʔ͍ͯͨ͠
    • Fiber ReconcilerͰ͸700·ͰOK
    https://github.com/TokamakUI/Tokamak/pull/471 38
    

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39. μWASI (swiftwasm/uwasi)
    • ܰྔWASI࣮૷ for ϒϥ΢β & Node.js
    • ैདྷͷ3rd-partyͷ࣮૷͸େ͖͗ͨ͢… (65.6 KB)
    • େ൒ͷػೳ͸࢖ͬͯͳ͔ͬͨ
    • SwiftWasmͰ৽͍͠ϞϊΛఏڙ:
    • Minimal: 3 KB
    • All features enabled: 6 KB
    https://github.com/swiftwasm/uwasi 39
    

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40. Help wanted!
    • ·ͩ·ͩ΍Δ͜ͱ୔ࢁ
    • ଟछଟ༷ͳ೉қ౓/ϨΠϠ
    • ॿ͚͍ͯͩ͘͞
    λεΫͷྖҬ
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41. Future Work
    • KeyPathݺͼग़͠ن໿ΛSIL্ʹ੍ఆ
    • LLVM LTOʹΑΔίʔυ࡟ݮΛnon-AppleϓϥοτϑΥʔϜʹҠ
    ২
    • LLVMʹllvm.linker.usedΛ௥Ճͯ͠ɺϦϯΫ࣌GCΛ༗ޮԽ
    • Web APIϕʔεͷFoundationNetworkingޓ׵࣮૷
    • ܕ෇͖ͷJS SwiftϒϦοδίʔυੜ੒ث
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42. GoodNotes is hiring!
    https://www.goodnotes.com/careers
    • Senior Software Engineer, Cross Platform (Swift, Wasm)
    • Senior Software Engineer, iOS
    • etc...
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43. Thank you :)
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