[Webkit-unassigned] [Bug 247383] New: [WASM-Function-References] Fix block signature parsing for reftypes
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Wed Nov 2 15:23:05 PDT 2022
https://bugs.webkit.org/show_bug.cgi?id=247383
Bug ID: 247383
Summary: [WASM-Function-References] Fix block signature parsing
for reftypes
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
Parsing of block signatures currently does not correctly account for ref types with type indices. Here is an example that illustrates the problem:
```
// Run this in JSTests/wasm/gc
import * as assert from "../assert.js";
import { compile, instantiate } from "./wast-wrapper.js";
instantiate(`
(module
(type (func))
(func (export "run")
(block (result (ref null func)) (ref.null 0)) ;; (ref null 0) <: (ref null func)
(br 0)
)
)
`).exports.run();
```
This program should validate (and does in the reference interpreter) but currently doesn't in JSC. The problem is that `(ref null func)` in the block signature is not parsed correctly; it gets turned into a ref type with an invalid 0 index.
This can be fixed by adding a special case to `parseBlockSignature` for ref types.
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