[Webkit-unassigned] [Bug 247396] New: [WASM-Function-References] Add support for local initialization tracking

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247396

            Bug ID: 247396
           Summary: [WASM-Function-References] Add support for local
                    initialization tracking
           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 typed function references proposal introduces non-defaultable types such as `(ref $t)`. References that inhabit those types must be initialized, and can't be used in an uninitialized state (like null).

As a result, it's necessary to track local initialization state somehow so that `local.get` can be disallowed on uninitialized references, and have a defined result on initialized locals.

The issue tracking the spec algorithm: https://github.com/WebAssembly/function-references/pull/63

The chosen algorithm for this is "1a" from here: https://github.com/WebAssembly/function-references/issues/44#issuecomment-1136373660 (initialization state is reset after each block)

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