private Tuple <NamedTypeSymbol, ImmutableArray <NamedTypeSymbol> > MakeDeclaredBases(ConsList <TypeSymbol> basesBeingResolved, DiagnosticBag diagnostics)
{
if (this.TypeKind == TypeKind.Enum)
{
// Handled by GetEnumUnderlyingType().
return(new Tuple <NamedTypeSymbol, ImmutableArray <NamedTypeSymbol> >(null, ImmutableArray <NamedTypeSymbol> .Empty));
}
var reportedPartialConflict = false;
Debug.Assert(basesBeingResolved == null || !basesBeingResolved.ContainsReference(this.OriginalDefinition));
var newBasesBeingResolved = basesBeingResolved.Prepend(this.OriginalDefinition);
var baseInterfaces = ArrayBuilder <NamedTypeSymbol> .GetInstance();
NamedTypeSymbol baseType = null;
SourceLocation baseTypeLocation = null;
var interfaceLocations = SpecializedCollections.GetPooledSymbolDictionaryInstance <NamedTypeSymbol, SourceLocation>();
foreach (var decl in this.declaration.Declarations)
{
Tuple <NamedTypeSymbol, ImmutableArray <NamedTypeSymbol> > one = MakeOneDeclaredBases(newBasesBeingResolved, decl, diagnostics);
if ((object)one == null)
{
continue;
}
var partBase = one.Item1;
var partInterfaces = one.Item2;
if (!reportedPartialConflict)
{
if ((object)baseType == null)
{
baseType = partBase;
baseTypeLocation = decl.NameLocation;
}
else if (baseType.TypeKind == TypeKind.Error && (object)partBase != null)
{
// if the old base was an error symbol, copy it to the interfaces list so it doesn't get lost
partInterfaces = partInterfaces.Add(baseType);
baseType = partBase;
baseTypeLocation = decl.NameLocation;
}
else if ((object)partBase != null && !TypeSymbol.Equals(partBase, baseType, TypeCompareKind.ConsiderEverything2) && partBase.TypeKind != TypeKind.Error)
{
// the parts do not agree
var info = diagnostics.Add(ErrorCode.ERR_PartialMultipleBases, Locations[0], this);
baseType = new ExtendedErrorTypeSymbol(baseType, LookupResultKind.Ambiguous, info);
baseTypeLocation = decl.NameLocation;
reportedPartialConflict = true;
}
}
foreach (var t in partInterfaces)
{
if (!interfaceLocations.ContainsKey(t))
{
baseInterfaces.Add(t);
interfaceLocations.Add(t, decl.NameLocation);
}
}
}
HashSet <DiagnosticInfo> useSiteDiagnostics = null;
if ((object)baseType != null)
{
Debug.Assert(baseTypeLocation != null);
if (baseType.IsStatic)
{
// '{1}': cannot derive from static class '{0}'
diagnostics.Add(ErrorCode.ERR_StaticBaseClass, baseTypeLocation, baseType, this);
}
if (!this.IsNoMoreVisibleThan(baseType, ref useSiteDiagnostics))
{
// Inconsistent accessibility: base class '{1}' is less accessible than class '{0}'
diagnostics.Add(ErrorCode.ERR_BadVisBaseClass, baseTypeLocation, this, baseType);
}
}
var baseInterfacesRO = baseInterfaces.ToImmutableAndFree();
if (DeclaredAccessibility != Accessibility.Private && IsInterface)
{
foreach (var i in baseInterfacesRO)
{
if (!i.IsAtLeastAsVisibleAs(this, ref useSiteDiagnostics))
{
// Inconsistent accessibility: base interface '{1}' is less accessible than interface '{0}'
diagnostics.Add(ErrorCode.ERR_BadVisBaseInterface, interfaceLocations[i], this, i);
}
}
}
interfaceLocations.Free();
diagnostics.Add(Locations[0], useSiteDiagnostics);
return(new Tuple <NamedTypeSymbol, ImmutableArray <NamedTypeSymbol> >(baseType, baseInterfacesRO));
}