[Webkit-unassigned] [Bug 254178] New: [Wasm-GC] Air assertion failure when casting to nullref
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Mar 20 13:23:01 PDT 2023
https://bugs.webkit.org/show_bug.cgi?id=254178
Bug ID: 254178
Summary: [Wasm-GC] Air assertion failure when casting to
nullref
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
An existing test, https://searchfox.org/wubkat/source/JSTests/wasm/gc/casts.js , fails in the wasm-simd, wasm-bbq, and wasm-air configurations when running the run-jsc-stress-tests script. I'm not sure why the test isn't being run with these configurations in CI.
The output is:
```
wasm.yaml/wasm/gc/casts.js.wasm-simd: ASSERTION FAILED: isSubtype(src.type(), dst.type())
wasm.yaml/wasm/gc/casts.js.wasm-simd: /home/tjc/WebKit/Source/JavaScriptCore/wasm/WasmAirIRGenerator64.cpp(701) : void JSC::Wasm::AirIRGenerator64::emitMove(const JSC::Wasm::TypedTmp&, const JSC::Wasm::TypedTmp&)
```
and the specific test case causing the error is the first one in `testNullCasts()`:
```
(func (param arrayref) (result nullref)
(ref.cast none (local.get 0)))
```
I'll submit a PR.
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