Intent to Ship: WebAssembly Multi-Memory

[Clemens Backes]

Contact emails

clem...@google.com

Explainer

We are ready for shipping the Multi-Memory proposal for WebAssembly, which recently moved to phase 4 according to the WebAssembly W3C process.

Specification

https://github.com/WebAssembly/multi-memory/blob/main/proposals/multi-memory/Overview.md

Design docs

https://github.com/WebAssembly/multi-memory/blob/main/proposals/multi-memory/Overview.md

Summary

Add support for more than one memory per WebAssembly module as specified in the WebAssembly Multi-Memory proposal: https://github.com/WebAssembly/multi-memory/blob/main/proposals/multi-memory/Overview.md

Blink component

Blink>JavaScript>WebAssembly

Search tags

Wasm, WebAssembly, Multi-Memory

TAG review

Not required as per: https://v8.dev/docs/feature-launch-process.

TAG review status

Not applicable

Risks

Interoperability and Compatibility

None

Gecko: Positive

WebKit: Positive

Web developers: Strongly positive (https://github.com/WebAssembly/proposals)

Other signals: This was voted to phase 4 (standardization) at the October 2023 WebAssembly Community Group meeting. 38 of 43 votes were "strongly for".

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

None

Debuggability

All memories are inspectable from DevTools, just like the first memory.

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?

Yes

Is this feature fully tested by web-platform-tests?

The WebAssembly proposal comes with all relevant tests; we pass them.

Flag name on chrome://flags

enable-experimental-webassembly-features

Finch feature name

None

Non-finch justification

None

Requires code in //chrome?

False

Tracking bug

https://crbug.com/v8/13918

Estimated milestones

Shipping on desktop	120
DevTrial on desktop	117

Shipping on Android	120
DevTrial on Android	117

Shipping on WebView

120

Shipping on WebView	120
DevTrial on iOS	117

Anticipated spec changes

None.

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5106389887746048

This intent message was generated by Chrome Platform Status.

[Alex Russell]

It's unclear why the TAG is not being informed or consulted. This has deep architectural implications for DOM integration and I'd expect to see those explained and worked.

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[Clemens Backes]

On Tue, Oct 17, 2023 at 7:42 PM Alex Russell <sligh...@chromium.org> wrote:

It's unclear why the TAG is not being informed or consulted. This has deep architectural implications for DOM integration and I'd expect to see those explained and worked.

As written in the ITS, a TAG review is not required as per https://v8.dev/docs/feature-launch-process#tag. The changes to the WebAssembly JS API are actually very minimal: Instead of one exported memory, you can now have multiple.

I don't see any implication for anything DOM related (but I am also not entirely sure what you mean by "DOM integration", there is nothing like this planned in WebAssembly). Can you elaborate on that?

[Clemens Backes]

There has not been an update on this ITS in 8 days. What's the expected timeline to get the LGTMs?

As the M120 branch cut is around the corner, I'll go ahead and prepare the launch, given that this is a feature voted to phase 4 in the W3C WebAssembly Community Group and all other approvals are there.

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Clemens Backes

Software Engineer

clem...@google.com

Google Germany GmbH

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80636 München

Geschäftsführer: Paul Manicle, Liana Sebastian   

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[Yoav Weiss]

LGTM1

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[Chris Harrelson]

LGTM2

On Wed, Oct 25, 2023 at 8:23 AM Yoav Weiss <yoav...@chromium.org> wrote:

LGTM1

On Wednesday, October 25, 2023 at 4:24:04 PM UTC+2 Clemens Backes wrote:

There has not been an update on this ITS in 8 days. What's the expected timeline to get the LGTMs?

Last week was BlinkOn and we do most reviews in our weekly meeting on Wednesdays.

 

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Clemens Backes

Software Engineer

clem...@google.com

Google Germany GmbH

Erika-Mann-Straße 33

80636 München

Geschäftsführer: Paul Manicle, Liana Sebastian   

Registergericht und -nummer: Hamburg, HRB 86891

Sitz der Gesellschaft: Hamburg

Diese E-Mail ist vertraulich. Falls sie diese fälschlicherweise erhalten haben sollten, leiten Sie diese bitte nicht an jemand anderes weiter, löschen Sie alle Kopien und Anhänge davon und lassen Sie mich bitte wissen, dass die E-Mail an die falsche Person gesendet wurde.

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[Mike Taylor]

LGTM3

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