internal ExtendedErrorTypeSymbol(NamespaceOrTypeSymbol containingSymbol, string name, string metadataName, DiagnosticInfo errorInfo, bool unreported = false, bool variableUsedBeforeDeclaration = false)
{
Debug.Assert(((object)containingSymbol == null) ||
(containingSymbol.Kind == LanguageSymbolKind.Namespace) ||
(containingSymbol.Kind == LanguageSymbolKind.NamedType) ||
(containingSymbol.Kind == LanguageSymbolKind.ErrorType));
Debug.Assert(name != null);
Debug.Assert(unreported == false || errorInfo != null);
_name = name;
_errorInfo = errorInfo;
_containingSymbol = containingSymbol;
_metadataName = metadataName;
_unreported = unreported;
this.VariableUsedBeforeDeclaration = variableUsedBeforeDeclaration;
_resultKind = LookupResultKind.Empty;
}
/// <summary>
/// Finds types or namespaces described by a qualified name.
/// </summary>
/// <param name="qualifiedName">Sequence of simple plain names.</param>
/// <returns>
/// A set of namespace or type symbols with given qualified name (might comprise of types with multiple generic arities),
/// or an empty set if the member can't be found (the qualified name is ambiguous or the symbol doesn't exist).
/// </returns>
/// <remarks>
/// "C.D" matches C.D, C{T}.D, C{S,T}.D{U}, etc.
/// </remarks>
internal IEnumerable <NamespaceOrTypeSymbol> GetNamespaceOrTypeByQualifiedName(IEnumerable <string> qualifiedName)
{
IEnumerable <NamespaceOrTypeSymbol> namespacesOrTypes = new NamespaceOrTypeSymbol[] { this };
IEnumerable <NamespaceOrTypeSymbol> symbols = null;
foreach (string name in qualifiedName)
{
if (symbols != null)
{
// there might be multiple types of different arity, prefer a non-generic type:
namespacesOrTypes = symbols;
}
symbols = namespacesOrTypes.SelectMany(nt => nt.GetMembers(name)).OfType <NamespaceOrTypeSymbol>();
}
return(symbols);
}
internal ExtendedErrorTypeSymbol(NamespaceOrTypeSymbol containingSymbol, Symbol guessSymbol, LookupResultKind resultKind, DiagnosticInfo errorInfo, bool unreported = false)
: this(containingSymbol, ImmutableArray.Create <Symbol>(guessSymbol), resultKind, errorInfo, guessSymbol.MetadataName, unreported)
{
}
internal ExtendedErrorTypeSymbol(NamespaceOrTypeSymbol guessSymbol, LookupResultKind resultKind, DiagnosticInfo errorInfo, bool unreported = false)
: this(guessSymbol.ContainingNamespaceOrType(), guessSymbol, resultKind, errorInfo, unreported)
{
}
/// <summary>
/// Lookup an immediately nested type referenced from metadata, names should be
/// compared case-sensitively.
/// </summary>
/// <param name="emittedTypeName">
/// Simple type name, possibly with generic name mangling.
/// </param>
/// <returns>
/// Symbol for the type, or MissingMetadataSymbol if the type isn't found.
/// </returns>
internal virtual NamedTypeSymbol LookupMetadataType(ref MetadataTypeName emittedTypeName)
{
Debug.Assert(!emittedTypeName.IsNull);
NamespaceOrTypeSymbol scope = this;
if (scope.Kind == LanguageSymbolKind.ErrorType)
{
return(new MissingMetadataTypeSymbol.Nested((NamedTypeSymbol)scope, ref emittedTypeName));
}
NamedTypeSymbol namedType = null;
ImmutableArray <NamedTypeSymbol> namespaceOrTypeMembers;
bool isTopLevel = scope.IsNamespace;
Debug.Assert(!isTopLevel || scope.ToDisplayString(SymbolDisplayFormat.QualifiedNameOnlyFormat) == emittedTypeName.NamespaceName);
if (emittedTypeName.IsMangled)
{
Debug.Assert(!emittedTypeName.UnmangledTypeName.Equals(emittedTypeName.TypeName) && emittedTypeName.InferredArity > 0);
if (emittedTypeName.ForcedArity == -1 || emittedTypeName.ForcedArity == emittedTypeName.InferredArity)
{
// Let's handle mangling case first.
namespaceOrTypeMembers = scope.GetTypeMembers(emittedTypeName.UnmangledTypeName);
foreach (var named in namespaceOrTypeMembers)
{
if (emittedTypeName.InferredArity == named.Arity && named.MangleName)
{
if ((object)namedType != null)
{
namedType = null;
break;
}
namedType = named;
}
}
}
}
else
{
Debug.Assert(ReferenceEquals(emittedTypeName.UnmangledTypeName, emittedTypeName.TypeName) && emittedTypeName.InferredArity == 0);
}
// Now try lookup without removing generic arity mangling.
int forcedArity = emittedTypeName.ForcedArity;
if (emittedTypeName.UseCLSCompliantNameArityEncoding)
{
// Only types with arity 0 are acceptable, we already examined types with mangled names.
if (emittedTypeName.InferredArity > 0)
{
goto Done;
}
else if (forcedArity == -1)
{
forcedArity = 0;
}
else if (forcedArity != 0)
{
goto Done;
}
else
{
Debug.Assert(forcedArity == emittedTypeName.InferredArity);
}
}
namespaceOrTypeMembers = scope.GetTypeMembers(emittedTypeName.TypeName);
foreach (var named in namespaceOrTypeMembers)
{
if (!named.MangleName && (forcedArity == -1 || forcedArity == named.Arity))
{
if ((object)namedType != null)
{
namedType = null;
break;
}
namedType = named;
}
}
Done:
if ((object)namedType == null)
{
if (isTopLevel)
{
return(new MissingMetadataTypeSymbol.TopLevel(scope.ContainingModule, ref emittedTypeName));
}
else
{
return(new MissingMetadataTypeSymbol.Nested((NamedTypeSymbol)scope, ref emittedTypeName));
}
}
return(namedType);
}