internal NamedTypeSymbol GetTopLevelTypeByMetadataName(
ref MetadataTypeName metadataName,
AssemblyIdentity assemblyOpt,
bool includeReferences,
bool isWellKnownType,
out (AssemblySymbol, AssemblySymbol) conflicts,
DiagnosticBag warnings = null,
bool ignoreCorLibraryDuplicatedTypes = false)
{
conflicts = default;
NamedTypeSymbol result;
// First try this assembly
result = GetTopLevelTypeByMetadataName(this, ref metadataName, assemblyOpt);
if (isWellKnownType && !IsValidWellKnownType(result))
{
result = null;
}
// ignore any types of the same name that might be in referenced assemblies (prefer the current assembly):
if ((object)result != null || !includeReferences)
{
return(result);
}
Debug.Assert(this is SourceAssemblySymbol,
"Never include references for a non-source assembly, because they don't know about aliases.");
var assemblies = ArrayBuilder <AssemblySymbol> .GetInstance();
// ignore reference aliases if searching for a type from a specific assembly:
if (assemblyOpt != null)
{
assemblies.AddRange(DeclaringCompilation.GetBoundReferenceManager().ReferencedAssemblies);
}
else
{
DeclaringCompilation.GetUnaliasedReferencedAssemblies(assemblies);
}
// Lookup in references
foreach (var assembly in assemblies)
{
Debug.Assert(!(this is SourceAssemblySymbol && assembly.IsMissing)); // Non-source assemblies can have missing references
NamedTypeSymbol candidate = GetTopLevelTypeByMetadataName(assembly, ref metadataName, assemblyOpt);
if (isWellKnownType && !IsValidWellKnownType(candidate))
{
candidate = null;
}
if ((object)candidate == null)
{
continue;
}
if (candidate.IsHiddenByCodeAnalysisEmbeddedAttribute())
{
continue;
}
Debug.Assert(!TypeSymbol.Equals(candidate, result, TypeCompareKind.ConsiderEverything2));
if ((object)result != null)
{
// duplicate
if (ignoreCorLibraryDuplicatedTypes)
{
if (IsInCorLib(candidate))
{
// ignore candidate
continue;
}
if (IsInCorLib(result))
{
// drop previous result
result = candidate;
continue;
}
}
if (warnings == null)
{
conflicts = (result.ContainingAssembly, candidate.ContainingAssembly);
result = null;
}
else
{
// The predefined type '{0}' is defined in multiple assemblies in the global alias; using definition from '{1}'
warnings.Add(ErrorCode.WRN_MultiplePredefTypes, NoLocation.Singleton, result, result.ContainingAssembly);
}
break;
}
result = candidate;
}
assemblies.Free();
return(result);
}