private static void RegisterType(TextWriter log, AssemblyScanRegistry assemblyScanRegistry, TypeDefinition type, TypeReference scanType)
{
// Nested type needs to be either public or internal otherwise we can't access them from other classes
if (type.IsNested && !type.IsNestedPublic && !type.IsNestedAssembly)
{
log.WriteLine($"{nameof(AssemblyScanProcessor)}: Can't register type [{type}] for scan type [{scanType}] because it is a nested private type");
return;
}
assemblyScanRegistry.Register(type, scanType);
}
private static void ScanAttributes(TextWriter log, AssemblyScanRegistry assemblyScanRegistry, TypeReference scanType, TypeDefinition type)
{
foreach (var attribute in scanType.Resolve().CustomAttributes)
{
// Check if scanned type has any AssemblyScanAttribute attribute
if (attribute.AttributeType.FullName == "Stride.Core.Reflection.AssemblyScanAttribute")
{
RegisterType(log, assemblyScanRegistry, type, scanType);
}
// Check if the attribute type has any AssemblyScanAttribute attribute
// This allows to create custom attributes and scan for them
foreach (var attributeAttribute in attribute.AttributeType.Resolve().CustomAttributes)
{
var hasAssemblyScanAttribute = false;
if (attributeAttribute.AttributeType.FullName == "Stride.Core.Reflection.AssemblyScanAttribute")
{
hasAssemblyScanAttribute = true;
}
else if (attributeAttribute.AttributeType.FullName == attributeUsageTypeName)
{
// If AttributeUsage has Inherited = false, let's skip right away if we are not processing main type
if (scanType != type && attributeAttribute.HasProperties &&
attributeAttribute.Properties.FirstOrDefault(x => x.Name == nameof(AttributeUsageAttribute.Inherited)).Argument.Value as bool? == false)
{
break;
}
}
if (hasAssemblyScanAttribute)
{
RegisterType(log, assemblyScanRegistry, type, attribute.AttributeType);
}
}
}
}
public bool Process(AssemblyProcessorContext context)
{
var registry = new AssemblyScanRegistry();
foreach (var type in context.Assembly.MainModule.GetAllTypes())
{
// Ignore interface types as well as types with generics
// Note: we could support generic types at some point but we probably need
// to get static generic instantiation type list from serializer code generator
if (type.IsInterface || type.HasGenericParameters)
{
continue;
}
var currentType = type;
// Scan type and parent types
while (currentType != null)
{
// Scan interfaces
foreach (var @interface in currentType.Interfaces)
{
ScanAttributes(context.Log, registry, @interface.InterfaceType, type);
}
ScanAttributes(context.Log, registry, currentType, type);
currentType = currentType.BaseType?.Resolve();
}
}
if (registry.HasScanTypes)
{
// This code should mirror what AssemblyScanCodeGenerator.tt generates
var assembly = context.Assembly;
var strideCoreModule = assembly.GetStrideCoreModule();
var assemblyRegistryType = strideCoreModule.GetType("Stride.Core.Reflection.AssemblyRegistry");
// Generate code
var assemblyScanType = new TypeDefinition("Stride.Core.Serialization.AssemblyScan",
Utilities.BuildValidClassName(assembly.Name.Name) + "AssemblyScan",
TypeAttributes.BeforeFieldInit | TypeAttributes.AnsiClass | TypeAttributes.AutoClass |
TypeAttributes.Public | TypeAttributes.Sealed | TypeAttributes.Abstract,
assembly.MainModule.TypeSystem.Object);
assembly.MainModule.Types.Add(assemblyScanType);
// Create Initialize method
var initializeMethod = new MethodDefinition("Initialize",
MethodAttributes.Assembly | MethodAttributes.HideBySig | MethodAttributes.Static,
assembly.MainModule.TypeSystem.Void);
assemblyScanType.Methods.Add(initializeMethod);
// Make sure it is called at module startup
initializeMethod.AddModuleInitializer(-2000);
var mscorlibAssembly = CecilExtensions.FindCorlibAssembly(assembly);
var collectionAssembly = CecilExtensions.FindCollectionsAssembly(assembly);
var reflectionAssembly = CecilExtensions.FindReflectionAssembly(assembly);
// Type
var typeType = mscorlibAssembly.MainModule.GetTypeResolved(typeof(Type).FullName);
var typeTypeRef = assembly.MainModule.ImportReference(typeType);
var getTypeFromHandleMethod = typeType.Methods.First(x => x.Name == nameof(Type.GetTypeFromHandle));
var getTokenInfoExMethod = reflectionAssembly.MainModule.GetTypeResolved("System.Reflection.IntrospectionExtensions").Resolve().Methods.First(x => x.Name == nameof(IntrospectionExtensions.GetTypeInfo));
var typeInfoType = reflectionAssembly.MainModule.GetTypeResolved(typeof(TypeInfo).FullName);
// Note: TypeInfo.Assembly/Module could be on the type itself or on its parent MemberInfo depending on runtime
var getTypeInfoAssembly = typeInfoType.Properties.Concat(typeInfoType.BaseType.Resolve().Properties).First(x => x.Name == nameof(TypeInfo.Assembly)).GetMethod;
// List<Type>
var listType = collectionAssembly.MainModule.GetTypeResolved(typeof(List <>).FullName);
var listTypeTypeRef = assembly.MainModule.ImportReference(listType).MakeGenericType(typeTypeRef);
// Dictionary<Type, List<Type>>
var dictionaryType = collectionAssembly.MainModule.GetType(typeof(Dictionary <,>).FullName);
var initializeMethodIL = initializeMethod.Body.GetILProcessor();
// AssemblyRegistry.RegisterScanTypes(typeof(AssemblyScanType).GetTypeInfo().Assembly, dictionary);
initializeMethodIL.Emit(OpCodes.Ldtoken, assemblyScanType);
initializeMethodIL.Emit(OpCodes.Call, assembly.MainModule.ImportReference(getTypeFromHandleMethod));
initializeMethodIL.Emit(OpCodes.Call, assembly.MainModule.ImportReference(getTokenInfoExMethod));
initializeMethodIL.Emit(OpCodes.Callvirt, assembly.MainModule.ImportReference(getTypeInfoAssembly));
// dictionary = new Dictionary<Type, List<Type>>();
initializeMethodIL.Emit(OpCodes.Newobj, assembly.MainModule.ImportReference(dictionaryType.GetEmptyConstructor()).MakeGeneric(typeTypeRef, listTypeTypeRef));
foreach (var scanTypeEntry in registry.ScanTypes)
{
initializeMethodIL.Emit(OpCodes.Dup);
// typeof(X)
initializeMethodIL.Emit(OpCodes.Ldtoken, assembly.MainModule.ImportReference(scanTypeEntry.Key.Resolve()));
initializeMethodIL.Emit(OpCodes.Call, assembly.MainModule.ImportReference(getTypeFromHandleMethod));
// new List<Type>();
initializeMethodIL.Emit(OpCodes.Newobj, assembly.MainModule.ImportReference(listType.GetEmptyConstructor()).MakeGeneric(typeTypeRef));
foreach (var scanType in scanTypeEntry.Value)
{
initializeMethodIL.Emit(OpCodes.Dup);
initializeMethodIL.Emit(OpCodes.Ldtoken, assembly.MainModule.ImportReference(scanType));
initializeMethodIL.Emit(OpCodes.Call, assembly.MainModule.ImportReference(getTypeFromHandleMethod));
initializeMethodIL.Emit(OpCodes.Callvirt, assembly.MainModule.ImportReference(listType.Methods.First(x => x.Name == "Add")).MakeGeneric(typeTypeRef));
}
initializeMethodIL.Emit(OpCodes.Callvirt, assembly.MainModule.ImportReference(dictionaryType.Methods.First(x => x.Name == "Add")).MakeGeneric(typeTypeRef, listTypeTypeRef));
}
initializeMethodIL.Emit(OpCodes.Newobj, assembly.MainModule.ImportReference(assemblyRegistryType.NestedTypes.First(x => x.Name == "ScanTypes").Methods.Single(x => x.IsConstructor && x.Parameters.Count == 1)));
initializeMethodIL.Emit(OpCodes.Call, assembly.MainModule.ImportReference(assemblyRegistryType.Methods.First(x => x.Name == "RegisterScanTypes")));
initializeMethodIL.Emit(OpCodes.Ret);
//var assemblyScanCodeGenerator = new AssemblyScanCodeGenerator(assembly, registry);
//sourceCodeRegisterAction(assemblyScanCodeGenerator.TransformText(), "AssemblyScan");
}
return(registry.HasScanTypes);
}