public static IntPtr ConvertUnboxingFunctionPointerToUnderlyingNonUnboxingPointer(IntPtr unboxingFunctionPointer, RuntimeTypeHandle declaringType)
{
if (FunctionPointerOps.IsGenericMethodPointer(unboxingFunctionPointer))
{
// Handle shared generic methods
unsafe
{
GenericMethodDescriptor *functionPointerDescriptor = FunctionPointerOps.ConvertToGenericDescriptor(unboxingFunctionPointer);
IntPtr nonUnboxingTarget = RuntimeAugments.GetCodeTarget(functionPointerDescriptor->MethodFunctionPointer);
Debug.Assert(nonUnboxingTarget != functionPointerDescriptor->MethodFunctionPointer);
Debug.Assert(nonUnboxingTarget == RuntimeAugments.GetCodeTarget(nonUnboxingTarget));
return(FunctionPointerOps.GetGenericMethodFunctionPointer(nonUnboxingTarget, functionPointerDescriptor->InstantiationArgument));
}
}
// GetCodeTarget will look through simple unboxing stubs (ones that consist of adjusting the this pointer and then
// jumping to the target.
IntPtr exactTarget = RuntimeAugments.GetCodeTarget(unboxingFunctionPointer);
if (RuntimeAugments.IsGenericType(declaringType))
{
IntPtr fatFunctionPointerTarget;
// This check looks for unboxing and instantiating stubs generated via the compiler backend
if (TypeLoaderEnvironment.TryGetTargetOfUnboxingAndInstantiatingStub(exactTarget, out fatFunctionPointerTarget))
{
// If this is an unboxing and instantiating stub, use separate table, find target, and create fat function pointer
exactTarget = FunctionPointerOps.GetGenericMethodFunctionPointer(fatFunctionPointerTarget,
declaringType.ToIntPtr());
}
#if FEATURE_UNIVERSAL_GENERICS
else
{
IntPtr newExactTarget;
// This check looks for unboxing and instantiating stubs generated dynamically as thunks in the calling convention converter
if (CallConverterThunk.TryGetNonUnboxingFunctionPointerFromUnboxingAndInstantiatingStub(exactTarget,
declaringType, out newExactTarget))
{
// CallingConventionConverter determined non-unboxing stub
exactTarget = newExactTarget;
}
else
{
// Target method was a method on a generic, but it wasn't a shared generic, and thus none of the above
// complex unboxing stub digging logic was necessary. Do nothing, and use exactTarget as discovered
// from GetCodeTarget
}
}
#endif
}
return(exactTarget);
}
private unsafe static IntPtr ResolveCallOnValueType(IntPtr unused, IntPtr callDescIntPtr)
#endif
{
GenericConstrainedCallDesc *callDesc = (GenericConstrainedCallDesc *)callDescIntPtr;
IntPtr targetAsVirtualCall = RuntimeAugments.GVMLookupForSlot(callDesc->_constraintType, callDesc->_constrainedMethod);
IntPtr exactTarget = IntPtr.Zero;
if (FunctionPointerOps.IsGenericMethodPointer(targetAsVirtualCall))
{
GenericMethodDescriptor *genMethodDesc = FunctionPointerOps.ConvertToGenericDescriptor(targetAsVirtualCall);
IntPtr actualCodeTarget = RuntimeAugments.GetCodeTarget(genMethodDesc->MethodFunctionPointer);
exactTarget = FunctionPointerOps.GetGenericMethodFunctionPointer(actualCodeTarget, genMethodDesc->InstantiationArgument);
}
else
{
IntPtr actualCodeTarget = RuntimeAugments.GetCodeTarget(targetAsVirtualCall);
IntPtr callConverterThunk;
if (CallConverterThunk.TryGetNonUnboxingFunctionPointerFromUnboxingAndInstantiatingStub(actualCodeTarget, callDesc->_constraintType, out callConverterThunk))
{
actualCodeTarget = callConverterThunk;
}
exactTarget = actualCodeTarget;
}
// Ensure that all threads will have their function pointers completely published before updating callDesc.
// as the ExactTarget is read from callDesc by binder generated code without a barrier, we need a barrier here
// to ensure that the new function pointer data is valid on all threads
Interlocked.MemoryBarrier();
// Its possible for multiple threads to race to set exact target. Check to see we always set the same value
if (callDesc->_exactTarget != IntPtr.Zero)
{
Debug.Assert(callDesc->_exactTarget == exactTarget);
}
callDesc->_exactTarget = exactTarget;
return(exactTarget);
}
public override IntPtr GetDelegateThunk(Delegate delegateObject, int thunkKind)
{
return CallConverterThunk.GetDelegateThunk(delegateObject, thunkKind);
}
//
// Lazily parse the method signature, and construct the call converter data
//
private void EnsureCallConversionInfoLoaded()
{
if (_signatureParsed)
{
return;
}
lock (this)
{
// Check if race was won by another thread and the signature got parsed
if (_signatureParsed)
{
return;
}
TypeSystemContext context = TypeSystemContextFactory.Create();
{
Instantiation typeInstantiation = Instantiation.Empty;
Instantiation methodInstantiation = Instantiation.Empty;
if (_typeArgs != null && _typeArgs.Length > 0)
{
typeInstantiation = context.ResolveRuntimeTypeHandles(_typeArgs);
}
if (_methodArgs != null && _methodArgs.Length > 0)
{
methodInstantiation = context.ResolveRuntimeTypeHandles(_methodArgs);
}
bool hasThis;
TypeDesc[] parameters;
bool[] paramsByRefForced;
if (!TypeLoaderEnvironment.Instance.GetCallingConverterDataFromMethodSignature(context, _methodSignature, typeInstantiation, methodInstantiation, out hasThis, out parameters, out paramsByRefForced))
{
Debug.Assert(false);
Environment.FailFast("Failed to get type handles for parameters in method signature");
}
Debug.Assert(parameters != null && parameters.Length >= 1);
bool[] byRefParameters = new bool[parameters.Length];
RuntimeTypeHandle[] parameterHandles = new RuntimeTypeHandle[parameters.Length];
for (int j = 0; j < parameters.Length; j++)
{
ByRefType parameterAsByRefType = parameters[j] as ByRefType;
if (parameterAsByRefType != null)
{
parameterAsByRefType.ParameterType.RetrieveRuntimeTypeHandleIfPossible();
parameterHandles[j] = parameterAsByRefType.ParameterType.RuntimeTypeHandle;
byRefParameters[j] = true;
}
else
{
parameters[j].RetrieveRuntimeTypeHandleIfPossible();
parameterHandles[j] = parameters[j].RuntimeTypeHandle;
byRefParameters[j] = false;
}
Debug.Assert(!parameterHandles[j].IsNull());
}
// Build thunk data
TypeHandle thReturnType = new TypeHandle(CallConverterThunk.GetByRefIndicatorAtIndex(0, byRefParameters), parameterHandles[0]);
TypeHandle[] thParameters = null;
if (parameters.Length > 1)
{
thParameters = new TypeHandle[parameters.Length - 1];
for (int i = 1; i < parameters.Length; i++)
{
thParameters[i - 1] = new TypeHandle(CallConverterThunk.GetByRefIndicatorAtIndex(i, byRefParameters), parameterHandles[i]);
}
}
_argIteratorData = new ArgIteratorData(hasThis, false, thParameters, thReturnType);
// StandardToStandard thunks don't actually need any parameters to change their ABI
// so don't force any params to be adjusted
if (!StandardToStandardThunk)
{
_paramsByRefForced = paramsByRefForced;
}
}
TypeSystemContextFactory.Recycle(context);
_signatureParsed = true;
}
}
private unsafe static IntPtr ResolveCallOnValueType(IntPtr unused, IntPtr callDescIntPtr)
#endif
{
NonGenericConstrainedCallDesc *callDesc = (NonGenericConstrainedCallDesc *)callDescIntPtr;
IntPtr exactTarget = IntPtr.Zero;
IntPtr targetOnTypeVtable = RuntimeAugments.ResolveDispatchOnType(callDesc->_constraintType, callDesc->_constrainedMethodType, callDesc->_constrainedMethodSlot);
bool decodeUnboxing = true;
if (!RuntimeAugments.IsInterface(callDesc->_constrainedMethodType))
{
// Non-interface constrained call on a valuetype to a method that isn't GetHashCode/Equals/ToString?!?!
if (callDesc->_constrainedMethodSlot > s_MaxObjectVTableSlot)
{
throw new NotSupportedException();
}
RuntimeTypeHandle baseTypeHandle;
bool gotBaseType = RuntimeAugments.TryGetBaseType(callDesc->_constraintType, out baseTypeHandle);
Debug.Assert(gotBaseType);
if (targetOnTypeVtable == RuntimeAugments.ResolveDispatchOnType(baseTypeHandle, callDesc->_constrainedMethodType, callDesc->_constrainedMethodSlot))
{
// In this case, the valuetype does not override the base types implementation of ToString(), GetHashCode(), or Equals(object)
decodeUnboxing = false;
}
}
if (decodeUnboxing)
{
exactTarget = RuntimeAugments.GetCodeTarget(targetOnTypeVtable);
if (RuntimeAugments.IsGenericType(callDesc->_constraintType))
{
IntPtr fatFunctionPointerTarget;
if (TypeLoaderEnvironment.TryGetTargetOfUnboxingAndInstantiatingStub(exactTarget, out fatFunctionPointerTarget))
{
// If this is an unboxing and instantiating stub, use seperate table, find target, and create fat function pointer
exactTarget = FunctionPointerOps.GetGenericMethodFunctionPointer(fatFunctionPointerTarget,
callDesc->_constraintType.ToIntPtr());
}
else
{
IntPtr newExactTarget;
if (CallConverterThunk.TryGetNonUnboxingFunctionPointerFromUnboxingAndInstantiatingStub(exactTarget,
callDesc->_constraintType, out newExactTarget))
{
// CallingConventionConverter determined non-unboxing stub
exactTarget = newExactTarget;
}
else
{
// Target method was a method on a generic, but it wasn't a shared generic, and thus none of the above
// complex unboxing stub digging logic was necessary. Do nothing, and use exactTarget as discovered
// from GetCodeTarget
}
}
}
}
else
{
// Create a fat function pointer, where the instantiation argument is ConstraintType, and the target is BoxAndToString, BoxAndGetHashCode, or BoxAndEquals
IntPtr realTarget;
switch (callDesc->_constrainedMethodSlot)
{
case s_ToStringSlot:
realTarget = s_boxAndToStringFuncPtr;
break;
case s_GetHashCodeSlot:
realTarget = s_boxAndGetHashCodeFuncPtr;
break;
case s_EqualsSlot:
realTarget = s_boxAndEqualsFuncPtr;
break;
default:
throw new NotSupportedException();
}
exactTarget = FunctionPointerOps.GetGenericMethodFunctionPointer(realTarget, callDesc->_constraintType.ToIntPtr());
}
// Ensure that all threads will have their function pointers completely published before updating callDesc.
// as the ExactTarget is read from callDesc by binder generated code without a barrier, we need a barrier here
// to ensure that the new function pointer data is valid on all threads
Interlocked.MemoryBarrier();
// Its possible for multiple threads to race to set exact target. Check to see we always set the same value
if (callDesc->_exactTarget != IntPtr.Zero)
{
Debug.Assert(callDesc->_exactTarget == exactTarget);
}
callDesc->_exactTarget = exactTarget;
return(exactTarget);
}
// This method computes the method pointer and dictionary pointer for a GVM.
// Inputs:
// - targetTypeHanlde: target type on which the GVM is implemented
// - nameAndSignature: name and signature of the GVM method
// - genericMethodArgumentHandles: GVM instantiation arguments
// Outputs:
// - methodPointer: pointer to the GVM's implementation
// - dictionaryPointer: (if applicable) pointer to the dictionary to be used with the GVM call
public bool TryGetGenericVirtualMethodPointer(RuntimeTypeHandle targetTypeHandle, MethodNameAndSignature nameAndSignature, RuntimeTypeHandle[] genericMethodArgumentHandles, out IntPtr methodPointer, out IntPtr dictionaryPointer)
{
methodPointer = dictionaryPointer = IntPtr.Zero;
TypeSystemContext context = TypeSystemContextFactory.Create();
DefType targetType = (DefType)context.ResolveRuntimeTypeHandle(targetTypeHandle);
Instantiation methodInstantiation = context.ResolveRuntimeTypeHandles(genericMethodArgumentHandles);
InstantiatedMethod method = (InstantiatedMethod)context.ResolveGenericMethodInstantiation(false, targetType, nameAndSignature, methodInstantiation, IntPtr.Zero, false);
if (!method.CanShareNormalGenericCode())
{
// First see if we can find an exact method implementation for the GVM (avoid using USG implementations if we can,
// because USG code is much slower).
if (TryLookupExactMethodPointerForComponents(targetTypeHandle, nameAndSignature, genericMethodArgumentHandles, out methodPointer))
{
Debug.Assert(methodPointer != IntPtr.Zero);
TypeSystemContextFactory.Recycle(context);
return(true);
}
}
// If we cannot find an exact method entry point, look for an equivalent template and compute the generic dictinoary
TemplateLocator templateLocator = new TemplateLocator();
NativeLayoutInfo nativeLayoutInfo = new NativeLayoutInfo();
InstantiatedMethod templateMethod = templateLocator.TryGetGenericMethodTemplate(method, out nativeLayoutInfo.Module, out nativeLayoutInfo.Token);
if (templateMethod == null)
{
return(false);
}
methodPointer = templateMethod.IsCanonicalMethod(CanonicalFormKind.Universal) ?
templateMethod.UsgFunctionPointer :
templateMethod.FunctionPointer;
if (!TryLookupGenericMethodDictionaryForComponents(targetTypeHandle, nameAndSignature, genericMethodArgumentHandles, out dictionaryPointer))
{
using (LockHolder.Hold(_typeLoaderLock))
{
// Now that we hold the lock, we may find that existing types can now find
// their associated RuntimeTypeHandle. Flush the type builder states as a way
// to force the reresolution of RuntimeTypeHandles which couldn't be found before.
context.FlushTypeBuilderStates();
if (!TypeBuilder.TryBuildGenericMethod(method, out dictionaryPointer))
{
return(false);
}
}
}
Debug.Assert(methodPointer != IntPtr.Zero && dictionaryPointer != IntPtr.Zero);
if (templateMethod.IsCanonicalMethod(CanonicalFormKind.Universal))
{
// Check if we need to wrap the method pointer into a calling convention converter thunk
if (!TypeLoaderEnvironment.Instance.MethodSignatureHasVarsNeedingCallingConventionConverter(context, nameAndSignature.Signature))
{
TypeSystemContextFactory.Recycle(context);
return(true);
}
RuntimeTypeHandle[] typeArgs = Array.Empty <RuntimeTypeHandle>();
if (RuntimeAugments.IsGenericType(targetTypeHandle))
{
RuntimeAugments.GetGenericInstantiation(targetTypeHandle, out typeArgs);
}
// Create a CallingConventionConverter to call the method correctly
IntPtr thunkPtr = CallConverterThunk.MakeThunk(
CallConverterThunk.ThunkKind.StandardToGenericInstantiating,
methodPointer,
nameAndSignature.Signature,
dictionaryPointer,
typeArgs,
genericMethodArgumentHandles);
Debug.Assert(thunkPtr != IntPtr.Zero);
methodPointer = thunkPtr;
// Set dictionaryPointer to null so we don't make a fat function pointer around the whole thing.
dictionaryPointer = IntPtr.Zero;
// TODO! add a new call converter thunk that will pass the instantiating arg through and use a fat function pointer.
// should allow us to make fewer thunks.
}
TypeSystemContextFactory.Recycle(context);
return(true);
}
