private TypeWithAnnotations GetConstraintTypeOrDefault(PEModuleSymbol moduleSymbol, MetadataReader metadataReader, MetadataDecoder tokenDecoder, GenericParameterConstraintHandle constraintHandle, ref bool hasUnmanagedModreqPattern)
{
var constraint = metadataReader.GetGenericParameterConstraint(constraintHandle);
var typeSymbol = tokenDecoder.DecodeGenericParameterConstraint(constraint.Type, out ImmutableArray <ModifierInfo <TypeSymbol> > modifiers);
if (!modifiers.IsDefaultOrEmpty && modifiers.Length > 1)
{
typeSymbol = new UnsupportedMetadataTypeSymbol();
}
else if (typeSymbol.SpecialType == SpecialType.System_ValueType)
{
// recognize "(class [mscorlib]System.ValueType modreq([mscorlib]System.Runtime.InteropServices.UnmanagedType" pattern as "unmanaged"
if (!modifiers.IsDefaultOrEmpty)
{
ModifierInfo <TypeSymbol> m = modifiers.Single();
if (!m.IsOptional && m.Modifier.IsWellKnownTypeUnmanagedType())
{
hasUnmanagedModreqPattern = true;
}
else
{
// Any other modifiers, optional or not, are not allowed: http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/528856
typeSymbol = new UnsupportedMetadataTypeSymbol();
}
}
// Drop 'System.ValueType' constraint type if the 'valuetype' constraint was also specified.
if (typeSymbol.SpecialType == SpecialType.System_ValueType && ((_flags & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0))
{
return(default);
private TypeWithAnnotations GetConstraintTypeOrDefault(PEModuleSymbol moduleSymbol, MetadataReader metadataReader, MetadataDecoder tokenDecoder, GenericParameterConstraintHandle constraintHandle, ref bool hasUnmanagedModreqPattern)
{
var constraint = metadataReader.GetGenericParameterConstraint(constraintHandle);
var typeSymbol = tokenDecoder.DecodeGenericParameterConstraint(constraint.Type, out bool hasUnmanagedModreq);
if (typeSymbol.SpecialType == SpecialType.System_ValueType)
{
// recognize "(class [mscorlib]System.ValueType modreq([mscorlib]System.Runtime.InteropServices.UnmanagedType" pattern as "unmanaged"
if (hasUnmanagedModreq)
{
hasUnmanagedModreqPattern = true;
}
// Drop 'System.ValueType' constraint type if the 'valuetype' constraint was also specified.
if (((_flags & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0))
{
return(default);