WebAssembly & Syscalls: A Story in Tool-Building
Lightningat Cloud Native Wasm Day Europe 2023 · on Tuesday, 2023-04-18· at 12:05· Hall 7, Room C | Ground Floor | Europe Complex·
summary
A small toolchain that discovers and virtualizes syscalls in arbitrary Wasm binaries: wazenTrace statically and dynamically finds which POSIX-like calls a module will invoke (it works even without WASI), Marcotte wasm generates libsys interfaces and an optional virtual VFS when run with --full, and the scale function runtime runs a Rust example doing open/read/close as a serverless function on localhost:8080 and deploys to a global edge in under 50 ms. Claim: VFS layers can avoid kernel context switches and may outperform native I/O in some cases.
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chapters (10)
- 0:00Introduction
- 1:02Syscalls in WebAssembly
- 2:28Handling syscalls approaches
- 3:31Tracing syscalls tooling
- 4:35Marquette and virtual layers
- 6:40Demo: File ops in serverless
- 8:30Virtual platform futures
- 10:38Tooling and standards evolution
- 10:59Closing remarks
- 11:19Q&A
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