static void Inherits(VTableConstruction vTbl, VTable baseVTbl)
{
foreach (VTableSlot slot in baseVTbl.Slots)
{
vTbl.AllSlots.Add(slot);
// It's possible to have same signature in multiple slots,
// when a derived type shadow the base type using newslot.
// In this case, use the derived type's slot in SlotsMap.
// The derived type's slots are always at a later position
// than the base type, so it would naturally 'override'
// their position in SlotsMap.
vTbl.SlotsMap[slot.Signature] = slot;
}
// This is the step 1 of 12.2 algorithm -- copy the base interface implementation.
foreach (var iface in baseVTbl.InterfaceSlots)
{
Debug.Assert(!vTbl.InterfaceSlots.ContainsKey(iface.Key));
vTbl.InterfaceSlots.Add(iface.Key, iface.Value.ToDictionary(slot => slot.Signature, slot => slot));
}
}
static VTable ResolveGenericArgument(TypeDef openType, GenericInstSig genInst, VTable vTable)
{
Debug.Assert(new SigComparer().Equals(openType, vTable.Type));
var ret = new VTable(genInst);
foreach (VTableSlot slot in vTable.Slots)
{
ret.Slots.Add(ResolveSlot(openType, slot, genInst.GenericArguments));
}
foreach (var iface in vTable.InterfaceSlots)
{
ret.InterfaceSlots.Add(GenericArgumentResolver.Resolve(iface.Key, genInst.GenericArguments),
iface.Value.Select(slot => ResolveSlot(openType, slot, genInst.GenericArguments)).ToList());
}
return(ret);
}
static void Implements(VTableConstruction vTbl, Dictionary <VTableSignature, MethodDef> virtualMethods, VTable ifaceVTbl, TypeSig iface)
{
// This is the step 2 of 12.2 algorithm -- use virtual newslot methods for explicit implementation.
Func <VTableSlot, VTableSlot> implLookup = slot => {
MethodDef impl;
if (virtualMethods.TryGetValue(slot.Signature, out impl) &&
impl.IsNewSlot && !impl.DeclaringType.IsInterface)
{
// Interface methods cannot implements base interface methods.
// The Overrides of interface slots should directly points to the root interface slot
var targetSlot = slot;
while (targetSlot.Overrides != null && !targetSlot.MethodDef.DeclaringType.IsInterface)
{
targetSlot = targetSlot.Overrides;
}
Debug.Assert(targetSlot.MethodDef.DeclaringType.IsInterface);
return(targetSlot.OverridedBy(impl));
}
return(slot);
};
if (vTbl.InterfaceSlots.ContainsKey(iface))
{
vTbl.InterfaceSlots[iface] = vTbl.InterfaceSlots[iface].Values.ToDictionary(
slot => slot.Signature, implLookup);
}
else
{
vTbl.InterfaceSlots.Add(iface, ifaceVTbl.Slots.ToDictionary(
slot => slot.Signature, implLookup));
}
foreach (var baseIface in ifaceVTbl.InterfaceSlots)
{
if (vTbl.InterfaceSlots.ContainsKey(baseIface.Key))
{
vTbl.InterfaceSlots[baseIface.Key] = vTbl.InterfaceSlots[baseIface.Key].Values.ToDictionary(
slot => slot.Signature, implLookup);
}
else
{
vTbl.InterfaceSlots.Add(baseIface.Key, baseIface.Value.ToDictionary(
slot => slot.Signature, implLookup));
}
}
}
public static VTable ConstructVTable(TypeDef typeDef, VTableStorage storage)
{
var ret = new VTable(typeDef.ToTypeSig());
var virtualMethods = typeDef.Methods
.Where(method => method.IsVirtual)
.ToDictionary(
method => VTableSignature.FromMethod(method),
method => method
);
// See Partition II 12.2 for implementation algorithm
VTableConstruction vTbl = new VTableConstruction();
// Inherits base type's slots
VTable baseVTbl = storage.GetVTable(typeDef.GetBaseTypeThrow());
if (baseVTbl != null)
{
Inherits(vTbl, baseVTbl);
}
// Explicit interface implementation
foreach (InterfaceImpl iface in typeDef.Interfaces)
{
VTable ifaceVTbl = storage.GetVTable(iface.Interface);
if (ifaceVTbl != null)
{
Implements(vTbl, virtualMethods, ifaceVTbl, iface.Interface.ToTypeSig());
}
}
// Normal interface implementation
if (!typeDef.IsInterface)
{
// Interface methods cannot implements base interface methods.
foreach (var iface in vTbl.InterfaceSlots.Values)
{
foreach (var entry in iface.ToList())
{
if (!entry.Value.MethodDef.DeclaringType.IsInterface)
{
continue;
}
// This is the step 1 of 12.2 algorithm -- find implementation for still empty slots.
// Note that it seems we should include newslot methods as well, despite what the standard said.
MethodDef impl;
VTableSlot implSlot;
if (virtualMethods.TryGetValue(entry.Key, out impl))
{
iface[entry.Key] = entry.Value.OverridedBy(impl);
}
else if (vTbl.SlotsMap.TryGetValue(entry.Key, out implSlot))
{
iface[entry.Key] = entry.Value.OverridedBy(implSlot.MethodDef);
}
}
}
}
// Normal overrides
foreach (var method in virtualMethods)
{
VTableSlot slot;
if (method.Value.IsNewSlot)
{
slot = new VTableSlot(method.Value, typeDef.ToTypeSig(), method.Key);
}
else
{
if (vTbl.SlotsMap.TryGetValue(method.Key, out slot))
{
Debug.Assert(!slot.MethodDef.IsFinal);
slot = slot.OverridedBy(method.Value);
}
else
{
slot = new VTableSlot(method.Value, typeDef.ToTypeSig(), method.Key);
}
}
vTbl.SlotsMap[method.Key] = slot;
vTbl.AllSlots.Add(slot);
}
// MethodImpls
foreach (var method in virtualMethods)
{
foreach (var impl in method.Value.Overrides)
{
Debug.Assert(impl.MethodBody == method.Value);
MethodDef targetMethod = impl.MethodDeclaration.ResolveThrow();
if (targetMethod.DeclaringType.IsInterface)
{
var iface = impl.MethodDeclaration.DeclaringType.ToTypeSig();
CheckKeyExist(storage, vTbl.InterfaceSlots, iface, "MethodImpl Iface");
var ifaceVTbl = vTbl.InterfaceSlots[iface];
var signature = VTableSignature.FromMethod(impl.MethodDeclaration);
CheckKeyExist(storage, ifaceVTbl, signature, "MethodImpl Iface Sig");
var targetSlot = ifaceVTbl[signature];
// The Overrides of interface slots should directly points to the root interface slot
while (targetSlot.Overrides != null)
{
targetSlot = targetSlot.Overrides;
}
Debug.Assert(targetSlot.MethodDef.DeclaringType.IsInterface);
ifaceVTbl[targetSlot.Signature] = targetSlot.OverridedBy(method.Value);
}
else
{
var targetSlot = vTbl.AllSlots.Single(slot => slot.MethodDef == targetMethod);
CheckKeyExist(storage, vTbl.SlotsMap, targetSlot.Signature, "MethodImpl Normal Sig");
targetSlot = vTbl.SlotsMap[targetSlot.Signature]; // Use the most derived slot
// Maybe implemented by above processes --- this process should take priority
while (targetSlot.MethodDef.DeclaringType == typeDef)
{
targetSlot = targetSlot.Overrides;
}
vTbl.SlotsMap[targetSlot.Signature] = targetSlot.OverridedBy(method.Value);
}
}
}
// Populate result V-table
ret.InterfaceSlots = vTbl.InterfaceSlots.ToDictionary(
kvp => kvp.Key, kvp => (IList <VTableSlot>)kvp.Value.Values.ToList());
foreach (var slot in vTbl.AllSlots)
{
ret.Slots.Add(slot);
}
return(ret);
}