[Webkit-unassigned] [Bug 226296] New: [WASM-Function-References] Add support for (ref null? $t) type constructor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226296

            Bug ID: 226296
           Summary: [WASM-Function-References] Add support for (ref null?
                    $t) type constructor
           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

This is a bug for adding the `(ref null? $t)` type constructor, which is part of the typed function references proposal (https://github.com/WebAssembly/function-references) and also needed for GC and type imports proposals.

The internal representation for such types was mostly already added in https://bugs.webkit.org/show_bug.cgi?id=222779. What's needed in addition is the ability to parse such types from Wasm binaries, and to represent nullability in the type. Adding nullability requires some additional checks in the Wasm/JS boundary in case the type is marked non-null (before typed function references, all reference types are nullable).

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