private static int GetMostDerivedDictionarySlot(ref TypeDesc nextTypeToExamineForDictionarySlot, out TypeDesc typeWithDictionary)
{
while (nextTypeToExamineForDictionarySlot != null)
{
if (nextTypeToExamineForDictionarySlot.GetOrCreateTypeBuilderState().HasDictionarySlotInVTable)
{
typeWithDictionary = nextTypeToExamineForDictionarySlot;
nextTypeToExamineForDictionarySlot = nextTypeToExamineForDictionarySlot.BaseType;
return GetDictionarySlotInVTable(typeWithDictionary);
}
nextTypeToExamineForDictionarySlot = nextTypeToExamineForDictionarySlot.BaseType;
}
typeWithDictionary = null;
return -1;
}
/// <summary>
/// Get the GC layout of a type when used as a field.
/// NOTE: if the fieldtype is a reference type, this function will return GCLayout.None
/// Consumers of the api must handle that special case.
/// </summary>
private unsafe TypeBuilder.GCLayout GetFieldGCLayout(TypeDesc fieldType)
{
if (!fieldType.IsValueType)
{
if (fieldType.IsPointer)
return TypeBuilder.GCLayout.None;
else
return TypeBuilder.GCLayout.SingleReference;
}
// Is this a type that already exists? If so, get its gclayout from the EEType directly
if (fieldType.RetrieveRuntimeTypeHandleIfPossible())
{
return new TypeBuilder.GCLayout(fieldType.RuntimeTypeHandle);
}
// The type of the field must be a valuetype that is dynamically being constructed
if (fieldType.IsTemplateCanonical())
{
// Pull the GC Desc from the canonical instantiation
TypeDesc templateType = fieldType.ComputeTemplate();
bool success = templateType.RetrieveRuntimeTypeHandleIfPossible();
Debug.Assert(success);
return new TypeBuilder.GCLayout(templateType.RuntimeTypeHandle);
}
else
{
// Use the type builder state's computed InstanceGCLayout
var instanceGCLayout = fieldType.GetOrCreateTypeBuilderState().InstanceGCLayout;
if (instanceGCLayout == null)
return TypeBuilder.GCLayout.None;
return new TypeBuilder.GCLayout(instanceGCLayout, false /* Always represents a valuetype as the reference type case
is handled above with the GCLayout.SingleReference return */);
}
}
// Get the GC layout of a type. Handles pre-created, universal template, and non-universal template cases
// Only to be used for getting the instance layout of non-valuetypes.
/// <summary>
/// Get the GC layout of a type. Handles pre-created, universal template, and non-universal template cases
/// Only to be used for getting the instance layout of non-valuetypes that are used as base types
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
private unsafe TypeBuilder.GCLayout GetInstanceGCLayout(TypeDesc type)
{
Debug.Assert(!type.IsCanonicalSubtype(CanonicalFormKind.Any));
Debug.Assert(!type.IsValueType);
if (type.RetrieveRuntimeTypeHandleIfPossible())
{
return new TypeBuilder.GCLayout(type.RuntimeTypeHandle);
}
if (type.IsTemplateCanonical())
{
var templateType = type.ComputeTemplate();
bool success = templateType.RetrieveRuntimeTypeHandleIfPossible();
Debug.Assert(success && !templateType.RuntimeTypeHandle.IsNull());
return new TypeBuilder.GCLayout(templateType.RuntimeTypeHandle);
}
else
{
TypeBuilderState state = type.GetOrCreateTypeBuilderState();
if (state.InstanceGCLayout == null)
return TypeBuilder.GCLayout.None;
else
return new TypeBuilder.GCLayout(state.InstanceGCLayout, true);
}
}
internal void GetFieldSizeAlignment(TypeDesc fieldType, out int size, out int alignment)
{
Debug.Assert(!fieldType.IsCanonicalSubtype(CanonicalFormKind.Any));
// All reference and array types are pointer-sized
if (!fieldType.IsValueType)
{
size = IntPtr.Size;
alignment = IntPtr.Size;
return;
}
// Is this a type that already exists? If so, get its size from the EEType directly
if (fieldType.RetrieveRuntimeTypeHandleIfPossible())
{
unsafe
{
EEType* eeType = fieldType.RuntimeTypeHandle.ToEETypePtr();
size = (int)eeType->ValueTypeSize;
alignment = eeType->FieldAlignmentRequirement;
return;
}
}
// The type of the field must be a generic valuetype that is dynamically being constructed
Debug.Assert(fieldType.IsValueType);
DefType fieldDefType = (DefType)fieldType;
TypeBuilderState state = fieldType.GetOrCreateTypeBuilderState();
size = fieldDefType.InstanceFieldSize;
alignment = fieldDefType.InstanceFieldAlignment;
}
private ComputedStaticFieldLayout ParseStaticRegionSizesFromNativeLayout(TypeDesc type)
{
int nonGcDataSize = 0;
int gcDataSize = 0;
int threadDataSize = 0;
TypeBuilderState state = type.GetOrCreateTypeBuilderState();
NativeParser typeInfoParser = state.GetParserForNativeLayoutInfo();
BagElementKind kind;
while ((kind = typeInfoParser.GetBagElementKind()) != BagElementKind.End)
{
switch (kind)
{
case BagElementKind.NonGcStaticDataSize:
TypeLoaderLogger.WriteLine("Found BagElementKind.NonGcStaticDataSize");
// Use checked typecast to int to ensure there aren't any overflows/truncations (size value used in allocation of memory later)
nonGcDataSize = checked((int)typeInfoParser.GetUnsigned());
break;
case BagElementKind.GcStaticDataSize:
TypeLoaderLogger.WriteLine("Found BagElementKind.GcStaticDataSize");
// Use checked typecast to int to ensure there aren't any overflows/truncations (size value used in allocation of memory later)
gcDataSize = checked((int)typeInfoParser.GetUnsigned());
break;
case BagElementKind.ThreadStaticDataSize:
TypeLoaderLogger.WriteLine("Found BagElementKind.ThreadStaticDataSize");
// Use checked typecast to int to ensure there aren't any overflows/truncations (size value used in allocation of memory later)
threadDataSize = checked((int)typeInfoParser.GetUnsigned());
break;
default:
typeInfoParser.SkipInteger();
break;
}
}
ComputedStaticFieldLayout staticLayout = new ComputedStaticFieldLayout()
{
GcStatics = new StaticsBlock() { Size = gcDataSize, LargestAlignment = DefType.MaximumAlignmentPossible },
NonGcStatics = new StaticsBlock() { Size = nonGcDataSize, LargestAlignment = DefType.MaximumAlignmentPossible },
Offsets = null, // We're not computing field offsets here, so return null
ThreadStatics = new StaticsBlock() { Size = threadDataSize, LargestAlignment = DefType.MaximumAlignmentPossible },
};
return staticLayout;
}
public override DefType[] ComputeRuntimeInterfaces(TypeDesc type)
{
TypeBuilderState state = type.GetOrCreateTypeBuilderState();
int totalInterfaces = RuntimeAugments.GetInterfaceCount(state.TemplateType.RuntimeTypeHandle);
TypeLoaderLogger.WriteLine("Building runtime interfaces for type " + type.ToString() + " (total interfaces = " + totalInterfaces.LowLevelToString() + ") ...");
DefType[] interfaces = new DefType[totalInterfaces];
int numInterfaces = 0;
//
// Copy over all interfaces from base class
//
if (type.BaseType != null)
{
foreach (var baseInterface in type.BaseType.RuntimeInterfaces)
{
// There should be no duplicates
Debug.Assert(!InterfaceInSet(interfaces, numInterfaces, baseInterface));
interfaces[numInterfaces++] = baseInterface;
TypeLoaderLogger.WriteLine(" -> Added basetype interface " + baseInterface.ToString() + " on type " + type.ToString());
}
}
NativeParser typeInfoParser = state.GetParserForNativeLayoutInfo();
NativeParser interfaceParser = typeInfoParser.GetParserForBagElementKind(BagElementKind.ImplementedInterfaces);
TypeDesc[] implementedInterfaces;
if (!interfaceParser.IsNull)
implementedInterfaces = state.NativeLayoutInfo.LoadContext.GetTypeSequence(ref interfaceParser);
else
implementedInterfaces = TypeDesc.EmptyTypes;
// Note that the order in which the interfaces are added to the list is same as the order in which the MDIL binder adds them.
// It is required for correctness
foreach (TypeDesc interfaceType in implementedInterfaces)
{
DefType interfaceTypeAsDefType = (DefType)interfaceType;
// Skip duplicates
if (InterfaceInSet(interfaces, numInterfaces, interfaceTypeAsDefType))
continue;
interfaces[numInterfaces++] = interfaceTypeAsDefType;
TypeLoaderLogger.WriteLine(" -> Added interface " + interfaceTypeAsDefType.ToString() + " on type " + type.ToString());
foreach (var inheritedInterface in interfaceTypeAsDefType.RuntimeInterfaces)
{
// Skip duplicates
if (InterfaceInSet(interfaces, numInterfaces, inheritedInterface))
continue;
interfaces[numInterfaces++] = inheritedInterface;
TypeLoaderLogger.WriteLine(" -> Added inherited interface " + inheritedInterface.ToString() + " on type " + type.ToString());
}
}
// TODO: Handle the screwy cases of generic interface folding
Debug.Assert(numInterfaces == totalInterfaces, "Unexpected number of interfaces");
return interfaces;
}
