public static bool IsVariantMethodCall(NodeFactory factory, MethodDesc calledMethod)
{
Debug.Assert(calledMethod.IsVirtual);
TypeDesc owningType = calledMethod.OwningType;
if (!owningType.IsInterface)
{
return(false);
}
bool result = false;
if (owningType.HasVariance)
{
TypeDesc owningTypeDefinition = owningType.GetTypeDefinition();
for (int i = 0; i < owningTypeDefinition.Instantiation.Length; i++)
{
var variantParameter = (GenericParameterDesc)owningTypeDefinition.Instantiation[i];
if (variantParameter.Variance != 0)
{
// Variant interface parameters that are instantiated over valuetypes are
// not actually variant. Neither are contravariant parameters instantiated
// over sealed types (there won't be another interface castable to it
// through variance on that parameter).
TypeDesc variantArgument = owningType.Instantiation[i];
if (!variantArgument.IsValueType &&
(!variantArgument.IsSealed() || variantParameter.IsCovariant))
{
result = true;
break;
}
}
}
}
if (!result && factory.TypeSystemContext.IsGenericArrayInterfaceType(owningType))
{
// We need to also do this for generic interfaces on arrays because they have a weird casting rule
// that doesn't require the implemented interface to be variant to consider it castable.
// For value types, we only need this when the array is castable by size (int[] and ICollection<uint>),
// or it's a reference type (Derived[] and ICollection<Base>).
TypeDesc elementType = owningType.Instantiation[0];
result =
CastingHelper.IsArrayElementTypeCastableBySize(elementType) ||
(elementType.IsDefType && !elementType.IsValueType);
}
return(result);
}
public static bool IsVariantInterfaceImplementation(NodeFactory factory, TypeDesc providingType, DefType implementedInterface)
{
Debug.Assert(implementedInterface.IsInterface);
Debug.Assert(!implementedInterface.IsGenericDefinition);
// If any of the implemented interfaces have variance, calls against compatible interface methods
// could result in interface methods of this type being used (e.g. IEnumerable<object>.GetEnumerator()
// can dispatch to an implementation of IEnumerable<string>.GetEnumerator()).
bool result = false;
if (implementedInterface.HasVariance)
{
TypeDesc interfaceDefinition = implementedInterface.GetTypeDefinition();
for (int i = 0; i < interfaceDefinition.Instantiation.Length; i++)
{
var variantParameter = (GenericParameterDesc)interfaceDefinition.Instantiation[i];
if (variantParameter.Variance != 0)
{
// Variant interface parameters that are instantiated over valuetypes are
// not actually variant. Neither are contravariant parameters instantiated
// over sealed types (there won't be another interface castable to it
// through variance on that parameter).
TypeDesc variantArgument = implementedInterface.Instantiation[i];
if (!variantArgument.IsValueType &&
(!variantArgument.IsSealed() || variantParameter.IsCovariant))
{
result = true;
break;
}
}
}
}
if (!result &&
(providingType.IsArray || providingType.GetTypeDefinition() == factory.ArrayOfTEnumeratorType) &&
implementedInterface.HasInstantiation)
{
// We need to also do this for generic interfaces on arrays because they have a weird casting rule
// that doesn't require the implemented interface to be variant to consider it castable.
// For value types, we only need this when the array is castable by size (int[] and ICollection<uint>),
// or it's a reference type (Derived[] and ICollection<Base>).
TypeDesc elementType = providingType.IsArray ? ((ArrayType)providingType).ElementType : providingType.Instantiation[0];
result =
CastingHelper.IsArrayElementTypeCastableBySize(elementType) ||
(elementType.IsDefType && !elementType.IsValueType);
}
return(result);
}
private void AddVirtualMethodUseDependencies(DependencyList dependencyList, NodeFactory factory)
{
if (_type.RuntimeInterfaces.Length > 0 && !factory.VTable(_type).HasFixedSlots)
{
DefType closestDefType = _type.GetClosestDefType();
foreach (var implementedInterface in _type.RuntimeInterfaces)
{
// If the type implements ICastable, the methods are implicitly necessary
if (implementedInterface == factory.ICastableInterface)
{
MethodDesc isInstDecl = implementedInterface.GetKnownMethod("IsInstanceOfInterface", null);
MethodDesc getImplTypeDecl = implementedInterface.GetKnownMethod("GetImplType", null);
MethodDesc isInstMethodImpl = _type.ResolveInterfaceMethodTarget(isInstDecl);
MethodDesc getImplTypeMethodImpl = _type.ResolveInterfaceMethodTarget(getImplTypeDecl);
if (isInstMethodImpl != null)
{
dependencyList.Add(factory.VirtualMethodUse(isInstMethodImpl), "ICastable IsInst");
}
if (getImplTypeMethodImpl != null)
{
dependencyList.Add(factory.VirtualMethodUse(getImplTypeMethodImpl), "ICastable GetImplType");
}
}
// If any of the implemented interfaces have variance, calls against compatible interface methods
// could result in interface methods of this type being used (e.g. IEnumberable<object>.GetEnumerator()
// can dispatch to an implementation of IEnumerable<string>.GetEnumerator()).
// For now, we will not try to optimize this and we will pretend all interface methods are necessary.
bool allInterfaceMethodsAreImplicitlyUsed = false;
if (implementedInterface.HasVariance)
{
TypeDesc interfaceDefinition = implementedInterface.GetTypeDefinition();
for (int i = 0; i < interfaceDefinition.Instantiation.Length; i++)
{
if (((GenericParameterDesc)interfaceDefinition.Instantiation[i]).Variance != 0 &&
!implementedInterface.Instantiation[i].IsValueType)
{
allInterfaceMethodsAreImplicitlyUsed = true;
break;
}
}
}
if (!allInterfaceMethodsAreImplicitlyUsed &&
(_type.IsArray || _type.GetTypeDefinition() == factory.ArrayOfTEnumeratorType) &&
implementedInterface.HasInstantiation)
{
// NOTE: we need to also do this for generic interfaces on arrays because they have a weird casting rule
// that doesn't require the implemented interface to be variant to consider it castable.
// For value types, we only need this when the array is castable by size (int[] and ICollection<uint>),
// or it's a reference type (Derived[] and ICollection<Base>).
TypeDesc elementType = _type.IsArray ? ((ArrayType)_type).ElementType : _type.Instantiation[0];
allInterfaceMethodsAreImplicitlyUsed =
CastingHelper.IsArrayElementTypeCastableBySize(elementType) ||
(elementType.IsDefType && !elementType.IsValueType);
}
if (allInterfaceMethodsAreImplicitlyUsed)
{
foreach (var interfaceMethod in implementedInterface.GetAllMethods())
{
if (interfaceMethod.Signature.IsStatic)
{
continue;
}
// Generic virtual methods are tracked by an orthogonal mechanism.
if (interfaceMethod.HasInstantiation)
{
continue;
}
MethodDesc implMethod = closestDefType.ResolveInterfaceMethodToVirtualMethodOnType(interfaceMethod);
if (implMethod != null)
{
dependencyList.Add(factory.VirtualMethodUse(interfaceMethod), "Variant interface method");
dependencyList.Add(factory.VirtualMethodUse(implMethod), "Variant interface method");
}
}
}
}
}
}
protected override DependencyList ComputeNonRelocationBasedDependencies(NodeFactory factory)
{
DependencyList dependencyList = base.ComputeNonRelocationBasedDependencies(factory);
// Ensure that we track the necessary type symbol if we are working with a constructed type symbol.
// The emitter will ensure we don't emit both, but this allows us assert that we only generate
// relocs to nodes we emit.
dependencyList.Add(factory.NecessaryTypeSymbol(_type), "NecessaryType for constructed type");
DefType closestDefType = _type.GetClosestDefType();
if (TrackInterfaceDispatchMapDepenendency && _type.RuntimeInterfaces.Length > 0)
{
dependencyList.Add(factory.InterfaceDispatchMap(_type), "Interface dispatch map");
}
if (_type.RuntimeInterfaces.Length > 0 && !factory.CompilationModuleGroup.ShouldProduceFullVTable(_type))
{
foreach (var implementedInterface in _type.RuntimeInterfaces)
{
// If the type implements ICastable, the methods are implicitly necessary
if (implementedInterface == factory.ICastableInterface)
{
MethodDesc isInstDecl = implementedInterface.GetKnownMethod("IsInstanceOfInterface", null);
MethodDesc getImplTypeDecl = implementedInterface.GetKnownMethod("GetImplType", null);
MethodDesc isInstMethodImpl = _type.ResolveInterfaceMethodTarget(isInstDecl);
MethodDesc getImplTypeMethodImpl = _type.ResolveInterfaceMethodTarget(getImplTypeDecl);
if (isInstMethodImpl != null)
{
dependencyList.Add(factory.VirtualMethodUse(isInstMethodImpl), "ICastable IsInst");
}
if (getImplTypeMethodImpl != null)
{
dependencyList.Add(factory.VirtualMethodUse(getImplTypeMethodImpl), "ICastable GetImplType");
}
}
// If any of the implemented interfaces have variance, calls against compatible interface methods
// could result in interface methods of this type being used (e.g. IEnumberable<object>.GetEnumerator()
// can dispatch to an implementation of IEnumerable<string>.GetEnumerator()).
// For now, we will not try to optimize this and we will pretend all interface methods are necessary.
bool allInterfaceMethodsAreImplicitlyUsed = false;
if (implementedInterface.HasVariance)
{
TypeDesc interfaceDefinition = implementedInterface.GetTypeDefinition();
for (int i = 0; i < interfaceDefinition.Instantiation.Length; i++)
{
if (((GenericParameterDesc)interfaceDefinition.Instantiation[i]).Variance != 0 &&
!implementedInterface.Instantiation[i].IsValueType)
{
allInterfaceMethodsAreImplicitlyUsed = true;
break;
}
}
}
if (!allInterfaceMethodsAreImplicitlyUsed &&
(_type.IsArray || _type.GetTypeDefinition() == factory.ArrayOfTEnumeratorType) &&
implementedInterface.HasInstantiation)
{
// NOTE: we need to also do this for generic interfaces on arrays because they have a weird casting rule
// that doesn't require the implemented interface to be variant to consider it castable.
// For value types, we only need this when the array is castable by size (int[] and ICollection<uint>),
// or it's a reference type (Derived[] and ICollection<Base>).
TypeDesc elementType = _type.IsArray ? ((ArrayType)_type).ElementType : _type.Instantiation[0];
allInterfaceMethodsAreImplicitlyUsed =
CastingHelper.IsArrayElementTypeCastableBySize(elementType) ||
(elementType.IsDefType && !elementType.IsValueType);
}
if (allInterfaceMethodsAreImplicitlyUsed)
{
foreach (var interfaceMethod in implementedInterface.GetAllMethods())
{
if (interfaceMethod.Signature.IsStatic)
{
continue;
}
// Generic virtual methods are tracked by an orthogonal mechanism.
if (interfaceMethod.HasInstantiation)
{
continue;
}
MethodDesc implMethod = closestDefType.ResolveInterfaceMethodToVirtualMethodOnType(interfaceMethod);
if (implMethod != null)
{
dependencyList.Add(factory.VirtualMethodUse(interfaceMethod), "Variant interface method");
dependencyList.Add(factory.VirtualMethodUse(implMethod), "Variant interface method");
}
}
}
}
}
if (_type.IsArray)
{
// Array EEType depends on System.Array's virtuals. Array EETypes don't point to
// their base type (i.e. there's no reloc based dependency making this "just work").
dependencyList.Add(factory.ConstructedTypeSymbol(_type.BaseType), "Array base type");
}
dependencyList.Add(factory.VTable(_type), "VTable");
if (closestDefType.HasGenericDictionarySlot())
{
// Add a dependency on the template for this type, if the canonical type should be generated into this binary.
DefType templateType = GenericTypesTemplateMap.GetActualTemplateTypeForType(factory, _type.ConvertToCanonForm(CanonicalFormKind.Specific));
if (templateType.IsCanonicalSubtype(CanonicalFormKind.Any) && !factory.NecessaryTypeSymbol(templateType).RepresentsIndirectionCell)
{
dependencyList.Add(factory.NativeLayout.TemplateTypeLayout(templateType), "Template Type Layout");
}
}
// Generated type contains generic virtual methods that will get added to the GVM tables
if (TypeGVMEntriesNode.TypeNeedsGVMTableEntries(_type))
{
dependencyList.Add(new DependencyListEntry(factory.TypeGVMEntries(_type), "Type with generic virtual methods"));
}
if (factory.TypeSystemContext.HasLazyStaticConstructor(_type))
{
// The fact that we generated an EEType means that someone can call RuntimeHelpers.RunClassConstructor.
// We need to make sure this is possible.
dependencyList.Add(new DependencyListEntry(factory.TypeNonGCStaticsSymbol((MetadataType)_type), "Class constructor"));
}
return(dependencyList);
}