[Webkit-unassigned] [Bug 249149] New: [Wasm-GC] Adjust struct.new opcode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249149

            Bug ID: 249149
           Summary: [Wasm-GC] Adjust struct.new opcode
           Product: WebKit
           Version: Other
          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 current implementation for Wasm GC struct operations is using an opcode for `struct.new` that is compatible with current V8 and Firefox (https://docs.google.com/document/d/14xWenN0lUoHa9TiDJd8yYR8ZKjgOhgO7iEmfrAuA1_M/edit#heading=h.9dwoku9340md), but not with the actual spec https://github.com/WebAssembly/gc/blob/main/proposals/gc/MVP.md.

The difference is using 0xfb01 or 0xfb07. The opcode numbers are likely to get renumbered eventually as part of a "cleanup" phase of the proposal.

I think we should potentially just support both opcode variations in the parser for now, which will allow us to run wasm programs produced with V8 in mind while also passing tests originating from the spec.

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