public bool IsCanonicallyEquivalent(RuntimeTypeHandle other)
{
if (_defType != null)
{
TypeDesc typeToFindAsCanon = _defType.ConvertToCanonForm(_canonKind);
TypeDesc otherTypeAsTypeDesc = _defType.Context.ResolveRuntimeTypeHandle(other);
TypeDesc otherTypeAsCanon = otherTypeAsTypeDesc.ConvertToCanonForm(_canonKind);
return(typeToFindAsCanon == otherTypeAsCanon);
}
if (!_genericDefinition.IsNull())
{
if (RuntimeAugments.IsGenericType(other))
{
RuntimeTypeHandle otherGenericDefinition;
RuntimeTypeHandle[] otherGenericArgs;
otherGenericDefinition = RuntimeAugments.GetGenericInstantiation(other, out otherGenericArgs);
return(_genericDefinition.Equals(otherGenericDefinition) && TypeLoaderEnvironment.Instance.CanInstantiationsShareCode(_genericArgs, otherGenericArgs, _canonKind));
}
else
{
return(false);
}
}
else
{
return(_typeToFind.Equals(other));
}
}
protected override void GetDependenciesDueToEETypePresence(ref DependencyList dependencies, NodeFactory factory, TypeDesc type)
{
if (!ConstructedEETypeNode.CreationAllowed(type))
{
// Both EETypeNode and ConstructedEETypeNode call into this logic. EETypeNode will only call for unconstructable
// EETypes. We don't have templates for those.
return;
}
DefType closestDefType = type.GetClosestDefType();
// TODO-SIZE: this is overly generous in the templates we create
if (closestDefType.HasInstantiation)
{
TypeDesc canonType = type.ConvertToCanonForm(CanonicalFormKind.Specific);
TypeDesc canonClosestDefType = closestDefType.ConvertToCanonForm(CanonicalFormKind.Specific);
// Add a dependency on the template for this type, if the canonical type should be generated into this binary.
// If the type is an array type, the check should be on its underlying Array<T> type. This is because a copy of
// an array type gets placed into each module but the Array<T> type only exists in the defining module and only
// one template is needed for the Array<T> type by the dynamic type loader.
if (canonType.IsCanonicalSubtype(CanonicalFormKind.Any) && !factory.NecessaryTypeSymbol(canonClosestDefType).RepresentsIndirectionCell)
{
dependencies.Add(factory.NativeLayout.TemplateTypeLayout(canonType), "Template Type Layout");
}
}
}
protected virtual MethodDesc ResolveVirtualMethod(MethodDesc declMethod, DefType implType)
{
MethodDesc impl;
if (declMethod.OwningType.IsInterface)
{
if (declMethod.OwningType.IsCanonicalSubtype(CanonicalFormKind.Any) || implType.IsCanonicalSubtype(CanonicalFormKind.Any))
{
DefType[] implTypeRuntimeInterfaces = implType.RuntimeInterfaces;
int canonicallyMatchingInterfacesFound = 0;
DefType canonicalInterfaceType = (DefType)declMethod.OwningType.ConvertToCanonForm(CanonicalFormKind.Specific);
for (int i = 0; i < implTypeRuntimeInterfaces.Length; i++)
{
DefType runtimeInterface = implTypeRuntimeInterfaces[i];
if (canonicalInterfaceType.HasSameTypeDefinition(runtimeInterface) &&
runtimeInterface.ConvertToCanonForm(CanonicalFormKind.Specific) == canonicalInterfaceType)
{
canonicallyMatchingInterfacesFound++;
if (canonicallyMatchingInterfacesFound > 1)
{
// We cannot resolve the interface as we don't know with exact enough detail which interface
// of multiple possible interfaces is being called.
return(null);
}
}
}
}
impl = implType.ResolveInterfaceMethodTarget(declMethod);
if (impl != null)
{
impl = implType.FindVirtualFunctionTargetMethodOnObjectType(impl);
}
}
else
{
impl = implType.FindVirtualFunctionTargetMethodOnObjectType(declMethod);
if (impl != null && (impl != declMethod))
{
MethodDesc slotDefiningMethodImpl = MetadataVirtualMethodAlgorithm.FindSlotDefiningMethodForVirtualMethod(impl);
MethodDesc slotDefiningMethodDecl = MetadataVirtualMethodAlgorithm.FindSlotDefiningMethodForVirtualMethod(declMethod);
if (slotDefiningMethodImpl != slotDefiningMethodDecl)
{
// We cannot resolve virtual method in case the impl is a different slot from the declMethod
impl = null;
}
}
}
return(impl);
}
/// <summary>
/// Gets a fully canonicalized base type if base type is canonical, or unmodified base type otherwise.
/// </summary>
public static DefType NormalizedBaseType(this TypeDesc type)
{
// Base type for Foo<__Canon> where Foo is defined as
// class Foo<T> : Bar<T, string> { }
// is Bar<__Canon, string>. This method normalizes it to Bar<__Canon, __Canon>.
DefType baseType = type.BaseType;
if (baseType != null && baseType.IsCanonicalSubtype(CanonicalFormKind.Any))
{
baseType = (DefType)baseType.ConvertToCanonForm(CanonicalFormKind.Specific);
}
return(baseType);
}
protected virtual MethodDesc ResolveVirtualMethod(MethodDesc declMethod, DefType implType, out CORINFO_DEVIRTUALIZATION_DETAIL devirtualizationDetail)
{
devirtualizationDetail = CORINFO_DEVIRTUALIZATION_DETAIL.CORINFO_DEVIRTUALIZATION_UNKNOWN;
MethodDesc impl;
if (declMethod.OwningType.IsInterface)
{
if (declMethod.OwningType.IsCanonicalSubtype(CanonicalFormKind.Any) || implType.IsCanonicalSubtype(CanonicalFormKind.Any))
{
DefType[] implTypeRuntimeInterfaces = implType.RuntimeInterfaces;
int canonicallyMatchingInterfacesFound = 0;
DefType canonicalInterfaceType = (DefType)declMethod.OwningType.ConvertToCanonForm(CanonicalFormKind.Specific);
for (int i = 0; i < implTypeRuntimeInterfaces.Length; i++)
{
DefType runtimeInterface = implTypeRuntimeInterfaces[i];
if (canonicalInterfaceType.HasSameTypeDefinition(runtimeInterface) &&
runtimeInterface.ConvertToCanonForm(CanonicalFormKind.Specific) == canonicalInterfaceType)
{
canonicallyMatchingInterfacesFound++;
if (canonicallyMatchingInterfacesFound > 1)
{
// We cannot resolve the interface as we don't know with exact enough detail which interface
// of multiple possible interfaces is being called.
devirtualizationDetail = CORINFO_DEVIRTUALIZATION_DETAIL.CORINFO_DEVIRTUALIZATION_MULTIPLE_IMPL;
return(null);
}
}
}
}
if (!implType.CanCastTo(declMethod.OwningType))
{
devirtualizationDetail = CORINFO_DEVIRTUALIZATION_DETAIL.CORINFO_DEVIRTUALIZATION_FAILED_CAST;
return(null);
}
impl = implType.ResolveInterfaceMethodTargetWithVariance(declMethod);
if (impl != null)
{
impl = implType.FindVirtualFunctionTargetMethodOnObjectType(impl);
}
else
{
MethodDesc dimMethod = null;
// This isn't the correct lookup algorithm for variant default interface methods
// but as we will drop any results we find in any case, it doesn't matter much.
// Non-variant dispatch can simply use ResolveInterfaceMethodToDefaultImplementationOnType
// but that implementation currently cannot handle variance.
MethodDesc defaultInterfaceDispatchDeclMethod = null;
foreach (TypeDesc iface in implType.RuntimeInterfaces)
{
if (iface == declMethod.OwningType)
{
defaultInterfaceDispatchDeclMethod = declMethod;
break;
}
if (iface.HasSameTypeDefinition(declMethod.OwningType) && iface.CanCastTo(declMethod.OwningType))
{
defaultInterfaceDispatchDeclMethod = iface.FindMethodOnTypeWithMatchingTypicalMethod(declMethod);
// Prefer to find the exact match, so don't break immediately
}
}
if (defaultInterfaceDispatchDeclMethod != null)
{
switch (implType.ResolveInterfaceMethodToDefaultImplementationOnType(defaultInterfaceDispatchDeclMethod, out dimMethod))
{
case DefaultInterfaceMethodResolution.Diamond:
case DefaultInterfaceMethodResolution.Reabstraction:
devirtualizationDetail = CORINFO_DEVIRTUALIZATION_DETAIL.CORINFO_DEVIRTUALIZATION_FAILED_DIM;
return(null);
case DefaultInterfaceMethodResolution.DefaultImplementation:
if (dimMethod.OwningType.HasInstantiation || (declMethod != defaultInterfaceDispatchDeclMethod))
{
// If we devirtualized into a default interface method on a generic type, we should actually return an
// instantiating stub but this is not happening.
// Making this work is tracked by https://github.com/dotnet/runtime/issues/9588
// In addition, we fail here for variant default interface dispatch
devirtualizationDetail = CORINFO_DEVIRTUALIZATION_DETAIL.CORINFO_DEVIRTUALIZATION_FAILED_DIM;
return(null);
}
else
{
impl = dimMethod;
}
break;
}
}
}
}
else
{
// The derived class should be a subclass of the base class.
// this check is perfomed via typedef checking instead of casting, as we accept canon methods calling exact types
TypeDesc checkType;
for (checkType = implType; checkType != null && !checkType.HasSameTypeDefinition(declMethod.OwningType); checkType = checkType.BaseType)
{
}
if ((checkType == null) || (checkType.ConvertToCanonForm(CanonicalFormKind.Specific) != declMethod.OwningType.ConvertToCanonForm(CanonicalFormKind.Specific)))
{
// The derived class should be a subclass of the base class.
devirtualizationDetail = CORINFO_DEVIRTUALIZATION_DETAIL.CORINFO_DEVIRTUALIZATION_FAILED_SUBCLASS;
return(null);
}
else
{
// At this point, the decl method may be only canonically compatible, but not an exact match to a method in the type hierarchy
// Convert it to an exact match. (Or if it is an exact match, the FindMethodOnTypeWithMatchingTypicalMethod will be a no-op)
declMethod = checkType.FindMethodOnTypeWithMatchingTypicalMethod(declMethod);
}
impl = implType.FindVirtualFunctionTargetMethodOnObjectType(declMethod);
if (impl != null && (impl != declMethod))
{
MethodDesc slotDefiningMethodImpl = MetadataVirtualMethodAlgorithm.FindSlotDefiningMethodForVirtualMethod(impl);
MethodDesc slotDefiningMethodDecl = MetadataVirtualMethodAlgorithm.FindSlotDefiningMethodForVirtualMethod(declMethod);
if (slotDefiningMethodImpl != slotDefiningMethodDecl)
{
// If the derived method's slot does not match the vtable slot,
// bail on devirtualization, as the method was installed into
// the vtable slot via an explicit override and even if the
// method is final, the slot may not be.
//
// Note the jit could still safely devirtualize if it had an exact
// class, but such cases are likely rare.
devirtualizationDetail = CORINFO_DEVIRTUALIZATION_DETAIL.CORINFO_DEVIRTUALIZATION_FAILED_SLOT;
impl = null;
}
}
}
return(impl);
}
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 (InterfaceDispatchMapNode.MightHaveInterfaceDispatchMap(_type, factory))
{
dependencyList.Add(factory.InterfaceDispatchMap(_type), "Interface dispatch map");
}
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");
ArrayType arrayType = (ArrayType)_type;
if (arrayType.IsMdArray && arrayType.Rank == 1)
{
// Allocating an MDArray of Rank 1 with zero lower bounds results in allocating
// an SzArray instead. Make sure the type loader can find the SzArray type.
dependencyList.Add(factory.ConstructedTypeSymbol(arrayType.ElementType.MakeArrayType()), "Rank 1 array");
}
}
dependencyList.Add(factory.VTable(closestDefType), "VTable");
if (closestDefType.HasInstantiation && factory.MetadataManager.SupportsReflection)
{
TypeDesc canonType = _type.ConvertToCanonForm(CanonicalFormKind.Specific);
TypeDesc canonClosestDefType = closestDefType.ConvertToCanonForm(CanonicalFormKind.Specific);
// Add a dependency on the template for this type, if the canonical type should be generated into this binary.
// If the type is an array type, the check should be on its underlying Array<T> type. This is because a copy of
// an array type gets placed into each module but the Array<T> type only exists in the defining module and only
// one template is needed for the Array<T> type by the dynamic type loader.
if (canonType.IsCanonicalSubtype(CanonicalFormKind.Any) && !factory.NecessaryTypeSymbol(canonClosestDefType).RepresentsIndirectionCell)
{
dependencyList.Add(factory.NativeLayout.TemplateTypeLayout(canonType), "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"));
AddDependenciesForUniversalGVMSupport(factory, _type, ref dependencyList);
}
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"));
}
// Ask the metadata manager if we have any dependencies due to reflectability.
factory.MetadataManager.GetDependenciesDueToReflectability(ref dependencyList, factory, _type);
factory.InteropStubManager.AddInterestingInteropConstructedTypeDependencies(ref dependencyList, factory, _type);
return(dependencyList);
}