public override void ResolveWithCurrentContext(ResolveContext rc)
{
base.ResolveWithCurrentContext(rc);
// modifiers check
if (ResolvedTypeDefinition.IsSealed && ResolvedTypeDefinition.IsAbstract)
{
rc.Report.Error(152, Location, "`{0}': an abstract class cannot be sealed or static", GetSignatureForError());
}
if ((mod_flags & Modifiers.STATIC) == Modifiers.STATIC && (mod_flags & Modifiers.SEALED) == Modifiers.SEALED)
{
rc.Report.Error(153, Location, "`{0}': a class cannot be both static and sealed", GetSignatureForError());
}
// classes cannot derive from a special type
if (ResolvedBaseType.IsKnownType(KnownTypeCode.Delegate) || ResolvedBaseType.IsKnownType(KnownTypeCode.MulticastDelegate) || ResolvedBaseType.IsKnownType(KnownTypeCode.Enum) || ResolvedBaseType.IsKnownType(KnownTypeCode.ValueType))
{
rc.Report.Error(195, Location, "`{0}' cannot derive from special class `{1}'",
GetSignatureForError(), ResolvedBaseType.ToString());
}
// members check
if (IsStatic)
{
if (PrimaryConstructorParameters != null)
{
rc.Report.Error(154, Location, "`{0}': Static classes cannot have primary constructor", GetSignatureForError());
PrimaryConstructorParameters = null;
}
}
}
void ResolveBaseTypes(ResolveContext rc)
{
int i = 0;
List <IType> checked_types = new List <IType>();
if (Kind == TypeKind.Class || Kind == TypeKind.Interface || Kind == TypeKind.Struct)
{
foreach (var bt in rc.CurrentTypeDefinition.DirectBaseTypes)
{
// duplicate check
if (checked_types.Contains(bt))
{
rc.Report.Error(158, Location,
"Duplicate base class `{0}' for type definition `{1}'", bt.ToString(),
ResolvedTypeDefinition.ToString());
continue;
}
checked_types.Add(bt);
// type parameter check
if (bt is TypeParameterSpec)
{
rc.Report.Error(193, Location, "`{0}': Cannot derive from type parameter `{1}'",
GetSignatureForError(), bt.Name);
continue;
}
// static class derive only from object
if (IsStatic && !bt.IsKnownType(KnownTypeCode.Object))
{
rc.Report.Error(194, Location, "Static class `{0}' cannot derive from type `{1}'. Static classes must derive from object",
GetSignatureForError(), bt.ToString());
}
// multiple inheritance check
if (bt.Kind == TypeKind.Class)
{
if (ResolvedBaseType != null && ResolvedBaseType != bt)
{
rc.Report.Error(159, Location,
"`{0}': Classes cannot have multiple base classes (`{1}' and `{2}')",
GetSignatureForError(), bt.ToString(), ResolvedBaseType.ToString());
}
// base class is first check
else if (i > 0 && Kind == TypeKind.Class && (!bt.IsKnownType(KnownTypeCode.Object) && !bt.IsKnownType(KnownTypeCode.ValueType)))
{
rc.Report.Error(160, Location,
"`{0}': Base class must be specified as first, `{1}' is not a the first base class",
GetSignatureForError(), bt.ToString());
}
ResolvedBaseType = bt;
}
else if (bt.Kind != TypeKind.Interface) // not an interface check
{
rc.Report.Error(161, Location, "Type `{0}' is not an interface", bt.ToString());
}
// if its an interface check the base interfaces
if (Kind == TypeKind.Interface && !ResolvedTypeDefinition.IsAccessibleAs(bt))
{
rc.Report.Error(162, Location,
"Inconsistent accessibility: base interface `{0}' is less accessible than interface `{1}'",
bt.ToString(), GetSignatureForError());
}
// circular dependency check
CheckCircular(ResolvedTypeDefinition, ResolvedTypeDefinition, bt, rc);
// sealed or static check
if ((bt as IEntity).IsSealed)
{
rc.Report.Error(163, Location,
"`{0}' is a sealed or a static class.",
bt.ToString());
}
// Type parameter unification check
if (bt.IsParameterized)
{
var unify = checked_types.Where(x => (x.IsParameterized && x.FullName == bt.FullName)).FirstOrDefault();
if (CanBeUnified(unify, bt))
{
rc.Report.Error(183, Location,
"`{0}' cannot implement both `{1}' and `{2}' because they may unify for some type parameter substitutions",
GetSignatureForError(), bt.ToString(), unify.ToString());
}
}
i++;
}
// check class accessibility
if (Kind == TypeKind.Class && ResolvedBaseType != null && !ResolvedTypeDefinition.IsAccessibleAs(ResolvedBaseType))
{
rc.Report.Error(162, Location,
"Inconsistent accessibility: base class `{0}' is less accessible than class `{1}'",
ResolvedBaseType.ToString(), ResolvedTypeDefinition.ToString());
}
// cannot derive from an attribute
if (ResolvedBaseType != null && ResolvedBaseType.IsKnownType(KnownTypeCode.Attribute) && ResolvedTypeDefinition.IsParameterized)
{
rc.Report.Error(155, Location,
"A generic type cannot derive from `{0}' because it is an attribute class",
ResolvedBaseType.ToString());
}
}
else if (Kind == TypeKind.Enum)
{
// only primitive integral types
ResolvedBaseType = rc.CurrentTypeDefinition.DirectBaseTypes.FirstOrDefault();
if (ResolvedBaseType != null && !ResolvedBaseType.IsKnownType(KnownTypeCode.Enum))
{
if (!ResolvedBaseType.IsKnownType(KnownTypeCode.Byte) && !ResolvedBaseType.IsKnownType(KnownTypeCode.SByte) &&
!ResolvedBaseType.IsKnownType(KnownTypeCode.Int16) && !ResolvedBaseType.IsKnownType(KnownTypeCode.UInt16) &&
!ResolvedBaseType.IsKnownType(KnownTypeCode.Int32) && !ResolvedBaseType.IsKnownType(KnownTypeCode.UInt32) &&
!ResolvedBaseType.IsKnownType(KnownTypeCode.Int64) && !ResolvedBaseType.IsKnownType(KnownTypeCode.UInt64))
{
rc.Report.Error(164, Location, "Type `{0}' is not sbyte,byte,short,ushort,int,uint,long,ulong", ResolvedBaseType.ToString());
}
}
}
if (ResolvedBaseType == null)
{
if (Kind == TypeKind.Class)
{
ResolvedBaseType = KnownTypeReference.Object.Resolve(rc.CurrentTypeResolveContext);
}
else if (Kind == TypeKind.Struct)
{
ResolvedBaseType = KnownTypeReference.ValueType.Resolve(rc.CurrentTypeResolveContext);
}
else if (Kind == TypeKind.Enum)
{
ResolvedBaseType = KnownTypeReference.Enum.Resolve(rc.CurrentTypeResolveContext);
}
else if (Kind == TypeKind.Delegate)
{
ResolvedBaseType = KnownTypeReference.MulticastDelegate.Resolve(rc.CurrentTypeResolveContext);
}
}
}