*Contact emails* [email protected], [email protected], [email protected]
*Explainer* https://github.com/WebAssembly/custom-descriptors/blob/main/proposals/custom-descriptors/Overview.md *Specification* https://github.com/WebAssembly/custom-descriptors/blob/main/proposals/custom-descriptors/Overview.md *Summary* Allows WebAssembly to store data associated with source-level types more efficiently in new "custom descriptor" objects. These custom descriptors can be configured with prototypes for the WebAssembly objects of that source-level type. This allows methods to be installed on a WebAssembly object's prototype chain and called directly from JS using normal method call syntax. The prototypes and methods can be configured declaratively using an imported builtin function. *Blink component* Blink>JavaScript>WebAssembly <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EJavaScript%3EWebAssembly%22> *Web Feature ID* *No information provided* *TAG review* *No information provided* *TAG review status* Pending *Origin Trial Name* WebAssembly Custom Descriptors V2 *Goals for experimentation* Initially we are looking to measure real-world performance, heap usage, and OOM rate impact of just the core Wasm part of the proposal. We want to verify that heap usage and OOM rates will decrease as expected and that the performance impact is negligible. If we do measure a performance impact, that will inform additional optimization work we would need to do in the implementation. Notably, the JS interop features of the proposal are out of scope for this initial experimentation. They will likely be evaluated in follow-on experiments. *Chromium Trial Name* WebAssemblyCustomDescriptorsV2 *Origin Trial documentation link* https://github.com/WebAssembly/custom-descriptors/blob/main/proposals/custom-descriptors/Overview.md *WebFeature UseCounter name* kV8WasmCustomDescriptors *Risks* *Interoperability and Compatibility* *No information provided* *Gecko*: No signal *WebKit*: No signal *Web developers*: No signals *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? *No information provided* *Reason this experiment is being extended* We need more time to validate the feature with real-world users, especially because we will soon land a new optimization that will hopefully bring measurable performance improvements. Besides the new optimization, we have made progress toward shipping by working with the WebAssembly community on burning down the remaining issues before achieving phase 4, which gates our shipping. *Ongoing technical constraints* None. *Debuggability* *No information provided* *Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?* Yes Standard WebAssembly feature, will be available wherever we ship V8 as the WebAssembly engine. *Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?* No *Flag name on about://flags* *No information provided* *Finch feature name* *No information provided* *Non-finch justification* *No information provided* *Requires code in //chrome?* False *Tracking bug* https://g-issues.chromium.org/issues/403372470 *Estimated milestones* Origin trial desktop first 149 Origin trial desktop last 155 Origin trial desktop first 141 Origin trial desktop last 147 Origin trial extension 1 end milestone 161 Origin trial Android first 149 Origin trial Android last 155 Origin trial Android first 141 Origin trial Android last 147 Origin trial WebView first 149 Origin trial WebView last 155 Origin trial WebView first 141 Origin trial WebView last 147 *Link to entry on the Chrome Platform Status* https://chromestatus.com/feature/6024844719947776?gate=5215600703045632 *Links to previous Intent discussions* Intent to Experiment: https://groups.google.com/a/chromium.org/g/blink-dev/c/_uPKlWwz_Lw/m/8qu70HJPCgAJ Intent to Experiment: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAJZD_EWidxA-LogDRBnDVM9cOMbu3OX3_3onqCZcSLVJm7%3DnvA%40mail.gmail.com This intent message was generated by Chrome Platform Status <https://chromestatus.com/>. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAJZD_EVqTx553fvVyFG%3DZQcX8JsGJpo-SFkgHUUqVhQpPNeLmQ%40mail.gmail.com.
