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guest-js-10-30-2024.md

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October 30, 2024 | JavaScript subgroup (BA Guest Languages SIG)

Agenda

N/A

Attendees

Attendee
Calvin Prewitt
Dirk Baeumer
Karthik Ganesharm
Luke Wagner
Till Schneidereit
Tomasz Andrzejak
Victor Adossi

Notes

JCO

ComponentizeJS

  • ComponentizeJS has some important bug fixes for supporting resources and the performance builtin worth noting
  • Debug build of ComponentizeJS still not carrying naming information, traced it down to a possible wasm-opt or toolchain bug with the RelWithDebInfo build in StarlingMonkey. Shame since we are so close to supporting proper traces
  • Great work by Victor on docs!
  • Great work by Calvin on async!
    • Draft PR into jco for JSPI & Asyncify
    • Allows for specifying which imports/exports should be async
    • Keeping this PR small, and will have another one for the WASI shims & web platform APIs
    • Need to sync with Guy and do a pair review, as impl has changed a bit since plumber summit
    • JSPI supports re-entrancy, but Asyncify does not. Looks like components will have to be re-instantiated in the Asyncify case
    • Some remaining work
  • Till: Work on piping multiple bodies into an outgoing body (from guest)
    • Opened PR bytecodealliance/StarlingMonkey#171
    • This PR contains a test case that takes in a request and turns it into multiple requests (one for each word in a sentence), and those get streamed back letter-by-letter & reconstructed.
      • Interesting to run w/ curl and seeing the streaming responses, since they come in parallel, makes for a good demo
    • This works and allows you to do things like combine chunks of video streams into one outgoing stream
    • Started working on this due to working with Joel on the append operation for wasi:http’s OutgoingBody
    • Right now you have to keep the component around during the splicing but the hope is that you can terminate the instance while the splicing finishes
    • Good demo might be sending 1000 requests to a wasmtime host and showing the memory usage w/ or w/out append
    • Not covered by Web Platform tests – didn’t encounter any failures, had to build our own test
  • Victor: Found a bug w/ unreachable fn in jco
    • Error:
 wasm://wasm/0288e6d6:1
RuntimeError: unreachable
	at wasm://wasm/0288e6d6:wasm-function[127]:0x24d91
	at wasm://wasm/0288e6d6:wasm-function[128]:0x24d9a
	at wasm://wasm/0288e6d6:wasm-function[4927]:0x224065
	at example:string-reverse-upper/[email protected]#reverse-and-uppercase (wasm://wasm/0288e6d6:wasm-function[12736]:0x79a5fe)
	at Object.reverseAndUppercase (file:///home/runner/work/jco/jco/examples/components/string-reverse-upper/dist/transpiled/string-reverse-upper.js:58:98)
	at file:///home/runner/work/jco/jco/examples/components/string-reverse-upper/run-transpiled.js:10:30

StarlingMonkey

  • Tomasz: Blob builtin support PR
    • Till: Looked at it, in-depth review is not done yet but it looks great
    • Tomasz: Passing 200 platform tests out of 230 right now, still some details left
    • Till: It may not make sense to wait for all the WPT tests to pass – some could be dependent on other parts that are not implemented (unrelated to Blob)
      • Tomasz: I do want to update the test harness (git revision), is that fine?
        • Till: Please do!