public sealed override unsafe bool TryGetGenericVirtualTargetForTypeAndSlot(RuntimeTypeHandle targetHandle, ref RuntimeTypeHandle declaringType, RuntimeTypeHandle[] genericArguments, ref string methodName, ref IntPtr methodSignature, out IntPtr methodPointer, out IntPtr dictionaryPointer, out bool slotUpdated)
{
MethodNameAndSignature methodNameAndSignature = new MethodNameAndSignature(methodName, methodSignature);
#if REFLECTION_EXECUTION_TRACE
ReflectionExecutionLogger.WriteLine("GVM resolution starting for " + GetTypeNameDebug(declaringType) + "." + methodNameAndSignature.Name + "(...) on a target of type " + GetTypeNameDebug(targetHandle) + " ...");
#endif
if (RuntimeAugments.IsInterface(declaringType))
{
methodPointer = IntPtr.Zero;
dictionaryPointer = IntPtr.Zero;
slotUpdated = ResolveInterfaceGenericVirtualMethodSlot(targetHandle, ref declaringType, ref methodNameAndSignature);
methodName = methodNameAndSignature.Name;
methodSignature = methodNameAndSignature.Signature;
return(slotUpdated);
}
else
{
slotUpdated = false;
return(ResolveGenericVirtualMethodTarget(targetHandle, declaringType, genericArguments, methodNameAndSignature, out methodPointer, out dictionaryPointer));
}
}
private bool FindMatchingInterfaceSlot(IntPtr moduleHandle, NativeReader nativeLayoutReader, ref NativeParser entryParser, ref ExternalReferencesTable extRefs, ref RuntimeTypeHandle declaringType, ref MethodNameAndSignature methodNameAndSignature, RuntimeTypeHandle openTargetTypeHandle, RuntimeTypeHandle[] targetTypeInstantiation, bool variantDispatch)
{
uint numTargetImplementations = entryParser.GetUnsigned();
for (uint j = 0; j < numTargetImplementations; j++)
{
uint nameAndSigToken = extRefs.GetRvaFromIndex(entryParser.GetUnsigned());
MethodNameAndSignature targetMethodNameAndSignature = GetMethodNameAndSignatureFromNativeReader(nativeLayoutReader, nameAndSigToken);
RuntimeTypeHandle targetTypeHandle = extRefs.GetRuntimeTypeHandleFromIndex(entryParser.GetUnsigned());
#if REFLECTION_EXECUTION_TRACE
ReflectionExecutionLogger.WriteLine(" Searching for GVM implementation on targe type = " + GetTypeNameDebug(targetTypeHandle));
#endif
uint numIfaceImpls = entryParser.GetUnsigned();
for (uint k = 0; k < numIfaceImpls; k++)
{
RuntimeTypeHandle implementingTypeHandle = extRefs.GetRuntimeTypeHandleFromIndex(entryParser.GetUnsigned());
uint numIfaceSigs = entryParser.GetUnsigned();
if (!openTargetTypeHandle.Equals(implementingTypeHandle))
{
// Skip over signatures data
for (uint l = 0; l < numIfaceSigs; l++)
{
entryParser.GetUnsigned();
}
continue;
}
for (uint l = 0; l < numIfaceSigs; l++)
{
RuntimeTypeHandle currentIfaceTypeHandle = default(RuntimeTypeHandle);
NativeParser ifaceSigParser = new NativeParser(nativeLayoutReader, extRefs.GetRvaFromIndex(entryParser.GetUnsigned()));
IntPtr currentIfaceSigPtr = ifaceSigParser.Reader.OffsetToAddress(ifaceSigParser.Offset);
if (TypeLoaderEnvironment.Instance.GetTypeFromSignatureAndContext(currentIfaceSigPtr, targetTypeInstantiation, null, out currentIfaceTypeHandle, out currentIfaceSigPtr))
{
Debug.Assert(!currentIfaceTypeHandle.IsNull());
if ((!variantDispatch && declaringType.Equals(currentIfaceTypeHandle)) ||
(variantDispatch && RuntimeAugments.IsAssignableFrom(declaringType, currentIfaceTypeHandle)))
{
#if REFLECTION_EXECUTION_TRACE
ReflectionExecutionLogger.WriteLine(" " + (declaringType.Equals(currentIfaceTypeHandle) ? "Exact" : "Variant-compatible") + " match found on this target type!");
#endif
// We found the GVM slot target for the input interface GVM call, so let's update the interface GVM slot and return success to the caller
declaringType = targetTypeHandle;
methodNameAndSignature = targetMethodNameAndSignature;
return(true);
}
}
}
}
}
return(false);
}
private unsafe bool ResolveGenericVirtualMethodTarget(RuntimeTypeHandle targetTypeHandle, RuntimeTypeHandle declaringType, RuntimeTypeHandle[] genericArguments, MethodNameAndSignature callingMethodNameAndSignature, out IntPtr methodPointer, out IntPtr dictionaryPointer)
{
methodPointer = dictionaryPointer = IntPtr.Zero;
// Get the open type definition of the containing type of the generic virtual method being resolved
RuntimeTypeHandle openCallingTypeHandle;
RuntimeTypeHandle[] callingTypeInstantiation;
if (!TryGetOpenTypeDefinition(declaringType, out openCallingTypeHandle, out callingTypeInstantiation))
{
return(false);
}
// Get the open type definition of the current type of the object instance on which the GVM is being resolved
RuntimeTypeHandle openTargetTypeHandle;
RuntimeTypeHandle[] targetTypeInstantiation;
if (!TryGetOpenTypeDefinition(targetTypeHandle, out openTargetTypeHandle, out targetTypeInstantiation))
{
return(false);
}
int hashCode = openCallingTypeHandle.GetHashCode();
hashCode = ((hashCode << 13) ^ hashCode) ^ openTargetTypeHandle.GetHashCode();
#if REFLECTION_EXECUTION_TRACE
ReflectionExecutionLogger.WriteLine("GVM Target Resolution = " + GetTypeNameDebug(targetTypeHandle) + "." + callingMethodNameAndSignature.Name);
#endif
foreach (IntPtr moduleHandle in ModuleList.Enumerate(RuntimeAugments.GetModuleFromTypeHandle(openTargetTypeHandle)))
{
NativeReader gvmTableReader;
if (!TryGetNativeReaderForBlob(moduleHandle, ReflectionMapBlob.GenericVirtualMethodTable, out gvmTableReader))
{
continue;
}
NativeReader nativeLayoutReader;
if (!TryGetNativeReaderForBlob(moduleHandle, ReflectionMapBlob.NativeLayoutInfo, out nativeLayoutReader))
{
continue;
}
NativeParser gvmTableParser = new NativeParser(gvmTableReader, 0);
NativeHashtable gvmHashtable = new NativeHashtable(gvmTableParser);
ExternalReferencesTable extRefs = default(ExternalReferencesTable);
extRefs.InitializeCommonFixupsTable(moduleHandle);
var lookup = gvmHashtable.Lookup(hashCode);
NativeParser entryParser;
while (!(entryParser = lookup.GetNext()).IsNull)
{
RuntimeTypeHandle parsedCallingTypeHandle = extRefs.GetRuntimeTypeHandleFromIndex(entryParser.GetUnsigned());
if (!parsedCallingTypeHandle.Equals(openCallingTypeHandle))
{
continue;
}
RuntimeTypeHandle parsedTargetTypeHandle = extRefs.GetRuntimeTypeHandleFromIndex(entryParser.GetUnsigned());
if (!parsedTargetTypeHandle.Equals(openTargetTypeHandle))
{
continue;
}
uint parsedCallingNameAndSigToken = extRefs.GetRvaFromIndex(entryParser.GetUnsigned());
MethodNameAndSignature parsedCallingNameAndSignature = GetMethodNameAndSignatureFromNativeReader(nativeLayoutReader, parsedCallingNameAndSigToken);
if (!parsedCallingNameAndSignature.Equals(callingMethodNameAndSignature))
{
continue;
}
uint parsedTargetMethodNameAndSigToken = extRefs.GetRvaFromIndex(entryParser.GetUnsigned());
MethodNameAndSignature targetMethodNameAndSignature = GetMethodNameAndSignatureFromNativeReader(nativeLayoutReader, parsedTargetMethodNameAndSigToken);
Debug.Assert(targetMethodNameAndSignature != null);
return(TypeLoaderEnvironment.Instance.TryGetGenericVirtualMethodPointer(targetTypeHandle, targetMethodNameAndSignature, genericArguments, out methodPointer, out dictionaryPointer));
}
}
return(false);
}
private bool ResolveInterfaceGenericVirtualMethodSlot(RuntimeTypeHandle targetTypeHandle, ref RuntimeTypeHandle declaringType, ref MethodNameAndSignature methodNameAndSignature)
{
// Get the open type definition of the containing type of the generic virtual method being resolved
RuntimeTypeHandle openCallingTypeHandle;
RuntimeTypeHandle[] callingTypeInstantiation;
if (!TryGetOpenTypeDefinition(declaringType, out openCallingTypeHandle, out callingTypeInstantiation))
{
return(false);
}
// Get the open type definition of the current type of the object instance on which the GVM is being resolved
RuntimeTypeHandle openTargetTypeHandle;
RuntimeTypeHandle[] targetTypeInstantiation;
if (!TryGetOpenTypeDefinition(targetTypeHandle, out openTargetTypeHandle, out targetTypeInstantiation))
{
return(false);
}
#if REFLECTION_EXECUTION_TRACE
ReflectionExecutionLogger.WriteLine("INTERFACE GVM call = " + GetTypeNameDebug(declaringType) + "." + methodNameAndSignature.Name);
#endif
foreach (IntPtr moduleHandle in ModuleList.Enumerate(RuntimeAugments.GetModuleFromTypeHandle(openTargetTypeHandle)))
{
NativeReader gvmTableReader;
if (!TryGetNativeReaderForBlob(moduleHandle, ReflectionMapBlob.InterfaceGenericVirtualMethodTable, out gvmTableReader))
{
continue;
}
NativeReader nativeLayoutReader;
if (!TryGetNativeReaderForBlob(moduleHandle, ReflectionMapBlob.NativeLayoutInfo, out nativeLayoutReader))
{
continue;
}
NativeParser gvmTableParser = new NativeParser(gvmTableReader, 0);
NativeHashtable gvmHashtable = new NativeHashtable(gvmTableParser);
ExternalReferencesTable extRefs = default(ExternalReferencesTable);
extRefs.InitializeCommonFixupsTable(moduleHandle);
var lookup = gvmHashtable.Lookup(openCallingTypeHandle.GetHashCode());
NativeParser entryParser;
while (!(entryParser = lookup.GetNext()).IsNull)
{
RuntimeTypeHandle interfaceTypeHandle = extRefs.GetRuntimeTypeHandleFromIndex(entryParser.GetUnsigned());
if (!openCallingTypeHandle.Equals(interfaceTypeHandle))
{
continue;
}
uint nameAndSigToken = extRefs.GetRvaFromIndex(entryParser.GetUnsigned());
MethodNameAndSignature interfaceMethodNameAndSignature = GetMethodNameAndSignatureFromNativeReader(nativeLayoutReader, nameAndSigToken);
if (!interfaceMethodNameAndSignature.Equals(methodNameAndSignature))
{
continue;
}
// For each of the possible GVM slot targets for the current interface call, we will do the following:
//
// Step 1: Scan the types that currently provide implementations for the current GVM slot target, and look
// for ones that match the target object's type.
//
// Step 2: For each type that we find in step #1, get a list of all the interfaces that the current GVM target
// provides an implementation for
//
// Step 3: For each interface in the list in step #2, parse the signature of that interface, do the generic argument
// substitution (in case of a generic interface), and check if this interface signature is assignable from the
// calling interface signature (from the name and sig input). if there is an exact match based on
// interface type, then we've found the right slot. Otherwise, re-scan the entry again and see if some interface
// type is compatible with the initial slots interface by means of variance.
// This is done by calling the TypeLoaderEnvironment helper function.
//
// Example:
// public interface IFoo<out T, out U>
// {
// string M1<V>();
// }
// public class Foo1<T, U> : IFoo<T, U>, IFoo<Kvp<T, string>, U>
// {
// string IFoo<T, U>.M1<V>() { ... }
// public virtual string M1<V>() { ... }
// }
// public class Foo2<T, U> : Foo1<object, U>, IFoo<U, T>
// {
// string IFoo<U, T>.M1<V>() { ... }
// }
//
// GVM Table layout for IFoo<T, U>.M1<V>:
// {
// InterfaceTypeHandle = IFoo<T, U>
// InterfaceMethodNameAndSignature = { "M1", SigOf(string M1) }
// GVMTargetSlots[] =
// {
// {
// TargetMethodNameAndSignature = { "M1", SigOf(M1) }
// TargetTypeHandle = Foo1<T, U>
// ImplementingTypes[] = {
// ImplementingTypeHandle = Foo1<T, U>
// ImplementedInterfacesSignatures[] = { SigOf(IFoo<!0, !1>) }
// }
// },
//
// {
// TargetMethodNameAndSignature = { "M1", SigOf(M1) }
// TargetTypeHandle = Foo1<T, U>
// ImplementingTypes[] = {
// ImplementingTypeHandle = Foo1<T, U>
// ImplementedInterfacesSignatures[] = { SigOf(IFoo<Kvp<!0, string>, !1>) }
// }
// },
//
// {
// TargetMethodNameAndSignature = { "M1", SigOf(M1) }
// TargetTypeHandle = Foo2<T, U>
// ImplementingTypes = {
// ImplementingTypeHandle = Foo2<T, U>
// ImplementedInterfacesSignatures[] = { SigOf(IFoo<!1, !0>) }
// }
// },
// }
// }
//
uint currentOffset = entryParser.Offset;
// Non-variant dispatch of a variant generic interface generic virtual method.
if (FindMatchingInterfaceSlot(moduleHandle, nativeLayoutReader, ref entryParser, ref extRefs, ref declaringType, ref methodNameAndSignature, openTargetTypeHandle, targetTypeInstantiation, false))
{
return(true);
}
entryParser.Offset = currentOffset;
// Variant dispatch of a variant generic interface generic virtual method.
if (FindMatchingInterfaceSlot(moduleHandle, nativeLayoutReader, ref entryParser, ref extRefs, ref declaringType, ref methodNameAndSignature, openTargetTypeHandle, targetTypeInstantiation, true))
{
return(true);
}
}
}
return(false);
}