[Webkit-unassigned] [Bug 254696] New: [Wasm-GC] Add support for new constant expressions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=254696

            Bug ID: 254696
           Summary: [Wasm-GC] Add support for new constant expressions
           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 Wasm GC proposal adds several new instructions that are constant expressions and can appear in global initializers (https://github.com/WebAssembly/gc/blob/main/proposals/gc/MVP.md#constant-expressions).

The instructions are i31, struct, and array allocation, and extern.externalize/internalize.

The proposal also generalizes global.get use in constant expressions.

It would probably make sense to implement this along with extended const expressions: https://bugs.webkit.org/show_bug.cgi?id=252483

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