/// <summary>
/// Gets a <see cref="Diagnostic"/>-s for invalid assembly-level <c>[D2D1CompileOptions]</c> attribute, if one is present.
/// </summary>
/// <param name="assemblySymbol">The input <see cref="IAssemblySymbol"/> instance to process.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
/// <returns>The diagnostic for the attribute, if invalid.</returns>
public static Diagnostic?GetAssemblyLevelCompileOptionsDiagnostics(IAssemblySymbol assemblySymbol, CancellationToken cancellationToken)
{
// In order to emit diagnostics for [D2D1CompileOptions] attributes at the assembly level, the following is needed:
// - The type symbol for the assembly, to get the AttributeData object for the [D2D1CompileOptions] attribute, if used.
// - The syntax node representing the attribute targeting the assembly, to get a location (this is retrieved from the AttributeData).
// - The input D2D1CompileOptions value, which can be retrieved from the constructor arguments of the AttributeData object.
if (assemblySymbol.TryGetAttributeWithFullMetadataName("ComputeSharp.D2D1.D2DCompileOptionsAttribute", out AttributeData? attributeData))
{
D2D1CompileOptions options = (D2D1CompileOptions)attributeData !.ConstructorArguments[0].Value !;
if ((options & D2D1CompileOptions.PackMatrixColumnMajor) != 0)
{
return(Diagnostic.Create(
InvalidPackMatrixColumnMajorOption,
attributeData.ApplicationSyntaxReference?.GetSyntax(cancellationToken).GetLocation(),
assemblySymbol));
}
}
return(null);
}