private bool IsWindowsAttributeUsageAttribute(EntityHandle targetType, CustomAttributeHandle attributeHandle)
{
// Check for Windows.Foundation.Metadata.AttributeUsageAttribute.
// WinMD rules:
// - The attribute is only applicable on TypeDefs.
// - Constructor must be a MemberRef with TypeRef.
if (targetType.Kind != HandleKind.TypeDefinition)
{
return(false);
}
var attributeCtor = CustomAttributeTable.GetConstructor(attributeHandle);
if (attributeCtor.Kind != HandleKind.MemberReference)
{
return(false);
}
var attributeType = MemberRefTable.GetClass((MemberReferenceHandle)attributeCtor);
if (attributeType.Kind != HandleKind.TypeReference)
{
return(false);
}
var attributeTypeRef = (TypeReferenceHandle)attributeType;
return(StringStream.EqualsRaw(TypeRefTable.GetName(attributeTypeRef), "AttributeUsageAttribute") &&
StringStream.EqualsRaw(TypeRefTable.GetNamespace(attributeTypeRef), "Windows.Foundation.Metadata"));
}
/// <summary>
/// Returns the type definition or reference handle of the attribute type.
/// </summary>
/// <returns><see cref="TypeDefinitionHandle"/> or <see cref="TypeReferenceHandle"/> or nil token if the metadata is invalid and the type can't be determined.</returns>
private EntityHandle GetAttributeTypeRaw(CustomAttributeHandle handle)
{
var ctor = CustomAttributeTable.GetConstructor(handle);
if (ctor.Kind == HandleKind.MethodDefinition)
{
return(GetDeclaringType((MethodDefinitionHandle)ctor));
}
if (ctor.Kind == HandleKind.MemberReference)
{
// In general the parent can be MethodDef, ModuleRef, TypeDef, TypeRef, or TypeSpec.
// For attributes only TypeDef and TypeRef are applicable.
EntityHandle typeDefOrRef = MemberRefTable.GetClass((MemberReferenceHandle)ctor);
HandleKind handleType = typeDefOrRef.Kind;
if (handleType == HandleKind.TypeReference || handleType == HandleKind.TypeDefinition)
{
return(typeDefOrRef);
}
}
return(default(EntityHandle));
}