Bug 198775 – [WHLSL] Code that accesses an undefined variable crashes

• Component: WebGPU
• Status: RESOLVED FIXED

[Saam Barati]

e.g:
```
vertex float4 vertexShader(float4 position : attribute(0), float i : attribute(1)) : SV_Position {
    return position;
}

fragment float4 fragmentShader(float4 position : SV_Position, constant float[] theBuffer : register(b0)) : SV_Target 0 {
    //float x;
    return float4(x, x, x, 1.0);
}

```

[Saam Barati]

Crashes in the Checker

[Saam Barati]

working on this next

[Saam Barati]

Created attachment 372593 [details]
patch

[Myles C. Maxfield]

Comment on attachment 372593 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=372593&action=review

> LayoutTests/webgpu/whlsl-use-undefined-variable.html:18
> +async function start() {

Where are the -expected.txts?

[Saam Barati]

Comment on attachment 372593 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=372593&action=review

> LayoutTests/ChangeLog:11
> +        Myles mostly fixed this in r246631 when he made NameResolver propagate
> +        its error to its parent NameResolver. However, there was still one bug
> +        where we ended up calling setError twice for an if statement. This patch
> +        fixes that and adds tests.

OOPS, This should go in WebCore's changelog

[Saam Barati]

Created attachment 372651 [details]
patch for landing

[WebKit Commit Bot]

Comment on attachment 372651 [details]
patch for landing

Clearing flags on attachment: 372651

Committed r246700: <https://trac.webkit.org/changeset/246700>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/52004615>