public override Conversion GetStackAllocConversion(BoundStackAllocArrayCreation sourceExpression, TypeSymbol destination, ref HashSet <DiagnosticInfo> useSiteDiagnostics)
{
if (sourceExpression.Syntax.IsVariableDeclarationInitialization())
{
Debug.Assert((object)sourceExpression.Type == null);
Debug.Assert(sourceExpression.ElementType != null);
var sourceAsPointer = new PointerTypeSymbol(TypeSymbolWithAnnotations.Create(sourceExpression.ElementType));
var pointerConversion = ClassifyImplicitConversionFromType(sourceAsPointer, destination, ref useSiteDiagnostics);
if (pointerConversion.IsValid)
{
return(Conversion.MakeStackAllocToPointerType(pointerConversion));
}
else
{
var spanType = _binder.GetWellKnownType(WellKnownType.System_Span_T, ref useSiteDiagnostics);
if (spanType.TypeKind == TypeKind.Struct && spanType.IsByRefLikeType)
{
var spanType_T = spanType.Construct(sourceExpression.ElementType);
var spanConversion = ClassifyImplicitConversionFromType(spanType_T, destination, ref useSiteDiagnostics);
if (spanConversion.Exists)
{
return(Conversion.MakeStackAllocToSpanType(spanConversion));
}
}
}
}
return(Conversion.NoConversion);
}
public override Conversion GetStackAllocConversion(BoundStackAllocArrayCreation sourceExpression, TypeSymbol destination, ref HashSet <DiagnosticInfo> useSiteDiagnostics)
{
if (sourceExpression.Syntax.IsVariableDeclarationInitialization())
{
Debug.Assert((object)sourceExpression.Type == null);
Debug.Assert(sourceExpression.ElementType != null);
var pointerConversion = default(Conversion);
var sourceAsPointer = new PointerTypeSymbol(sourceExpression.ElementType);
pointerConversion = ClassifyImplicitConversionFromType(sourceAsPointer, destination, ref useSiteDiagnostics);
if (pointerConversion.IsValid)
{
// Report unsafe errors
_binder.ReportUnsafeIfNotAllowed(sourceExpression.Syntax.Location, ref useSiteDiagnostics);
return(Conversion.MakeStackAllocToPointerType(pointerConversion));
}
else
{
var spanType = _binder.GetWellKnownType(WellKnownType.System_Span_T, ref useSiteDiagnostics);
if (spanType.TypeKind == TypeKind.Struct && spanType.IsByRefLikeType)
{
var spanType_T = spanType.Construct(sourceExpression.ElementType);
var spanConversion = ClassifyImplicitConversionFromType(spanType_T, destination, ref useSiteDiagnostics);
if (spanConversion.Exists)
{
// Report errors if Span ctor is missing, or using an older C# version
Binder.CheckFeatureAvailability(sourceExpression.Syntax, MessageID.IDS_FeatureRefStructs, ref useSiteDiagnostics);
Binder.GetWellKnownTypeMember(_binder.Compilation, WellKnownMember.System_Span_T__ctor, out DiagnosticInfo memberDiagnosticInfo);
HashSetExtensions.InitializeAndAdd(ref useSiteDiagnostics, memberDiagnosticInfo);
return(Conversion.MakeStackAllocToSpanType(spanConversion));
}
}
}
}
return(Conversion.NoConversion);
}