[Webkit-unassigned] [Bug 254693] New: [Wasm-GC] Implement casts at Wasm-JS function call boundaries

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=254693

            Bug ID: 254693
           Summary: [Wasm-GC] Implement casts at Wasm-JS function call
                    boundaries
           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

When calling into Wasm from JS, `ToWebAssemblyValue` needs to be called on JS values to convert them to Wasm values. For GC types, this is currently not implemented.

In general, it's necessary to add a `extern.internalize` and `ref.cast` to the target Wasm type on such a call.

In the other direction, `ToJSValue` is typically a no-op for Wasm GC values, but it still needs to be enabled.

The machinery to do these casts is already in JSC, but it needs to be hooked up to code in JSToWasm.cpp and WasmToJS.cpp to do the right thing.

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