internal List <TypeRef> GetExtendindTypes(TypeDef type, CodedIndex ciForThisType)
{
List <TypeRef> inheritingTypes = new List <TypeRef>();
List <CodedIndex> ourIndexes = new List <CodedIndex>(); // our coded index in typedef and any that appear in the type spec metadata Signatures
ourIndexes.Add(ciForThisType);
// All types in this assembly that extend another use the TypeDef.Extends data in the metadata
// table.
if (type.IsGeneric)
{
MetadataRow[] typeSpecs = _metadataStream.Tables[MetadataTables.TypeSpec];
for (int i = 0; i < typeSpecs.Length; i++)
{
TypeSpecMetadataTableRow row = typeSpecs[i] as TypeSpecMetadataTableRow;
if (row != null)
{
// We need to find all of the TypeSpec references that point back to us, remember
// that as a generic type people can inherit from us in different ways - Type<int> or Type<string>
// for example. Each one of these will be a different type spec.
TypeSpec spec = _metadataMap.GetDefinition(MetadataTables.TypeSpec, row) as TypeSpec;
SignatureToken token = spec.Signiture.TypeToken.Tokens[0];
// First check if it is a GenericInstance as per the signiture spec in ECMA 23.2.14
if (token.TokenType == SignatureTokens.ElementType && ((ElementTypeSignatureToken)token).ElementType == ElementTypes.GenericInstance)
{
ElementTypeSignatureToken typeToken = spec.Signiture.TypeToken.Tokens[1] as ElementTypeSignatureToken;
TypeRef typeRef = typeToken.ResolveToken(Assembly);
if (typeRef == type)
{
ourIndexes.Add(new CodedIndex(MetadataTables.TypeSpec, (uint)i + 1));
}
}
}
}
}
MetadataRow[] typeDefs = _metadataStream.Tables[MetadataTables.TypeDef];
for (int i = 0; i < typeDefs.Length; i++)
{
for (int j = 0; j < ourIndexes.Count; j++)
{
TypeDefMetadataTableRow row = (TypeDefMetadataTableRow)typeDefs[i];
CodedIndex ourCi = ourIndexes[j];
if (row.Extends == ourCi)
{
inheritingTypes.Add(
(TypeDef)_metadataMap.GetDefinition(MetadataTables.TypeDef, _metadataStream.Tables[MetadataTables.TypeDef][i])
);
continue; // a type can only be extending once so if we find ourselves we are done
}
}
}
return(inheritingTypes);
}