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>
/// We want to know if a given method implements a redirected interface.
/// For example, if we are given the method RemoveAt on a class "A"
/// which implements the IVector interface (which is redirected
/// to IList in .NET) then this method would return true. The most
/// likely reason why we would want to know this is that we wish to hide
/// (mark private) all methods which implement methods on a redirected
/// interface.
/// </summary>
/// <param name="memberRef">The declaration token for the method</param>
/// <param name="isIDisposable">
/// Returns true if the redirected interface is <see cref="IDisposable"/>.
/// </param>
/// <returns>True if the method implements a method on a redirected interface.
/// False otherwise.</returns>
private bool ImplementsRedirectedInterface(MemberReferenceHandle memberRef, out bool isIDisposable)
{
isIDisposable = false;
EntityHandle parent = MemberRefTable.GetClass(memberRef);
TypeReferenceHandle typeRef;
if (parent.Kind == HandleKind.TypeReference)
{
typeRef = (TypeReferenceHandle)parent;
}
else if (parent.Kind == HandleKind.TypeSpecification)
{
BlobHandle blob = TypeSpecTable.GetSignature((TypeSpecificationHandle)parent);
BlobReader sig = new BlobReader(BlobStream.GetMemoryBlock(blob));
if (sig.Length < 2 ||
sig.ReadByte() != (byte)CorElementType.ELEMENT_TYPE_GENERICINST ||
sig.ReadByte() != (byte)CorElementType.ELEMENT_TYPE_CLASS)
{
return(false);
}
EntityHandle token = sig.ReadTypeHandle();
if (token.Kind != HandleKind.TypeReference)
{
return(false);
}
typeRef = (TypeReferenceHandle)token;
}
else
{
return(false);
}
return(GetProjectionIndexForTypeReference(typeRef, out isIDisposable) >= 0);
}
/// <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));
}