[Webkit-unassigned] [Bug 252299] New: [Wasm-GC] Uninitialized locals with GC types are not initialized to jsNull()
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Tue Feb 14 22:49:33 PST 2023
https://bugs.webkit.org/show_bug.cgi?id=252299
Bug ID: 252299
Summary: [Wasm-GC] Uninitialized locals with GC types are not
initialized to jsNull()
Product: WebKit
Version: WebKit Local Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: WebAssembly
Assignee: webkit-unassigned at lists.webkit.org
Reporter: tjc at igalia.com
The following test:
```
//@ runWebAssemblySuite("--useWebAssemblyTypedFunctionReferences=true", "--useWebAssemblyGC=true")
import * as assert from "../assert.js";
import { compile, instantiate } from "./wast-wrapper.js";
function module(bytes, valid = true) {
let buffer = new ArrayBuffer(bytes.length);
let view = new Uint8Array(buffer);
for (let i = 0; i < bytes.length; ++i) {
print(bytes.charCodeAt(i));
view[i] = bytes.charCodeAt(i);
}
return new WebAssembly.Module(buffer);
}
function arrayGetUninitializedLocal() {
let m = instantiate(`(module
(type $a (array (mut i32)))
(type $s (struct (field $x (mut i32)) (field $y (mut i64))))
(func (export "arrayGetNull")
(local (ref null $a)) (drop (array.get $a (local.get 0) (i32.const 0)))
))`);
assert.throws(() => m.exports.arrayGetNull(), WebAssembly.RuntimeError, "array.get to a null reference");
}
arrayGetUninitializedLocal();
```
causes a segfault. This is because of the `LLIntGenerator::addLocal()` method, which only initializes funcref-typed and extern-ref typed locals to the JS null value; not those with struct or array types. It should handle all ref types in the same way.
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