[Webkit-unassigned] [Bug 251039] New: [Wasm-GC] Add extern.internalize/externalize

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251039

            Bug ID: 251039
           Summary: [Wasm-GC] Add extern.internalize/externalize
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: asumu at igalia.com

The extern.internalize/externalize instructions are used to explicitly convert between the externref type and values in the anyref hierarchy. https://github.com/WebAssembly/gc/blob/main/proposals/gc/MVP.md#external-conversion

Currently this isn't implemented, so no anyref values can be exported externally. The conversions done by these instructions will also be implicitly used at the Wasm-JS boundary, whenever a conversion is needed by the JS API (e.g., for function calls between the languages).

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