On 9/12/23 9:22 PM, 'Emanuel Ziegler' via blink-dev wrote:
Dear API owners,
Following the continued experiment for Garbage Collected
WebAssembly (WasmGC), we plan to ship the feature in M119
after the positive vote to phase 4 by the WebAssembly
Community Group today.
The feature has shown very good performance with reasonable
compromises. The findings from the origin trial are summarized
in a public document
<https://docs.google.com/document/d/1KsbQLh_RzM9ixF6bzmJwyRMQLE-rSFlz_zNoGv-EITY/edit?usp=sharing>.
This feature is tied to the Function References
<https://github.com/WebAssembly/function-references>proposal
which is a de-facto part of WasmGC (no current use outside of
the proposal, hard requirement for WasmGC) and only listed as
a separate proposal for historic reasons. The Function
References proposal has therefore also been voted to phase 4
on the same day as WasmGC.
We plan to launch the feature in the following manner:
1.
End the current origin trial with M118 as its last milestone
2.
Refactor the binary instruction representation to match
the final spec (incompatible change)
3.
Ship the feature with M119
This plan sounds good. Thx.
Our data from the trial has shown that there is a need for
fast string interoperability with JS that this proposal does
not address. We plan to launch a new experiment investigating
different approaches to this problem (see separate I2E mail).
Contact emails
[email protected], [email protected]
Explainer
https://github.com/WebAssembly/gc/blob/master/proposals/gc/Overview.md
https://github.com/WebAssembly/function-references/blob/main/proposals/function-references/Overview.md
Specification
https://github.com/WebAssembly/gc/tree/main/proposals/gc
Summary
The GC proposal adds efficient support for high-level managed
languages to WebAssembly, via struct and array types that enable
language compilers targeting Wasm to integrate with a garbage
collector in the host VM. In Chrome, enabling this feature implies
enabling Typed Function References, which allow function references to
be stored in the aforementioned structs and arrays.
Blink component
Blink>JavaScript>WebAssembly
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EJavaScript%3EWebAssembly>
Search tags
wasm <https://chromestatus.com/features#tags:wasm>, webassembly
<https://chromestatus.com/features#tags:webassembly>, gc
<https://chromestatus.com/features#tags:gc>, managed objects
<https://chromestatus.com/features#tags:managed%20objects>, wasmgc
<https://chromestatus.com/features#tags:wasmgc>
TAG review
https://github.com/w3ctag/design-reviews/issues/814
TAG review status
Issues addressed
Risks
Interoperability and Compatibility
/Gecko/: Positive
/WebKit/: No signal
Can we request a signal?
https://github.com/WebKit/standards-positions/issues/new/choose
/Web developers/: Positive Google Sheets, which is currently compiling
Java to JavaScript, is experimenting with using WasmGC to speed up
their calculation engine. JetBrains is working on a Kotlin -> WasmGC
compiler. Dart is working on a Dart -> WasmGC compiler, in
collaboration with Flutter.
/Other signals/:
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?
Debuggability
Can you say more about this?
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
No
Can you say more about this?
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No
In this case, is this new feature covered by existing wasm test suites?
Flag name on chrome://flags
Finch feature name
None
Presumably this is behind a feature, if an Origin Trial occured, right?
Non-finch justification
The feature does not enable any functionality without the module being
explicitly compiled for that feature. We therefore chose to use an
origin trial to evaluate its suitability and stability. This allowed
websites that want to try this feature to opt in and do their own A/B
comparisons.
Requires code in //chrome?
False
Tracking bug
https://bugs.chromium.org/p/v8/issues/detail?id=7748
Launch bug
https://launch.corp.google.com/launch/4231622
Estimated milestones
OriginTrial desktop last 120
OriginTrial desktop first 112
OriginTrial Android last 120
OriginTrial Android first 112
Anticipated spec changes
Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github
issues in the project for the feature specification) whose resolution
may introduce web compat/interop risk (e.g., changing to naming or
structure of the API in a non-backward-compatible way).
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/6062715726462976
Links to previous Intent discussions
Intent to Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/HDbvHCVFSW0
Intent to Extend Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/7F_daEqGQAY
Intent to Ship:
https://groups.google.com/a/chromium.org/g/blink-dev/c/7F_daEqGQAY
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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