/// <summary>
/// Constructs a new instance of <see cref="DelegateCreationInfo"/> set up to construct a delegate of type
/// '<paramref name="delegateType"/>' pointing to '<paramref name="targetMethod"/>'.
/// </summary>
public static DelegateCreationInfo Create(TypeDesc delegateType, MethodDesc targetMethod, NodeFactory factory, bool followVirtualDispatch)
{
CompilerTypeSystemContext context = factory.TypeSystemContext;
DefType systemDelegate = context.GetWellKnownType(WellKnownType.MulticastDelegate).BaseType;
int paramCountTargetMethod = targetMethod.Signature.Length;
if (!targetMethod.Signature.IsStatic)
{
paramCountTargetMethod++;
}
DelegateInfo delegateInfo = context.GetDelegateInfo(delegateType.GetTypeDefinition());
int paramCountDelegateClosed = delegateInfo.Signature.Length + 1;
bool closed = false;
if (paramCountDelegateClosed == paramCountTargetMethod)
{
closed = true;
}
else
{
Debug.Assert(paramCountDelegateClosed == paramCountTargetMethod + 1);
}
if (targetMethod.Signature.IsStatic)
{
MethodDesc invokeThunk;
MethodDesc initMethod;
if (!closed)
{
initMethod = systemDelegate.GetKnownMethod("InitializeOpenStaticThunk", null);
invokeThunk = delegateInfo.Thunks[DelegateThunkKind.OpenStaticThunk];
}
else
{
// Closed delegate to a static method (i.e. delegate to an extension method that locks the first parameter)
invokeThunk = delegateInfo.Thunks[DelegateThunkKind.ClosedStaticThunk];
initMethod = systemDelegate.GetKnownMethod("InitializeClosedStaticThunk", null);
}
var instantiatedDelegateType = delegateType as InstantiatedType;
if (instantiatedDelegateType != null)
{
invokeThunk = context.GetMethodForInstantiatedType(invokeThunk, instantiatedDelegateType);
}
return(new DelegateCreationInfo(
factory.MethodEntrypoint(initMethod),
targetMethod,
TargetKind.ExactCallableAddress,
factory.MethodEntrypoint(invokeThunk)));
}
else
{
if (!closed)
{
throw new NotImplementedException("Open instance delegates");
}
string initializeMethodName = "InitializeClosedInstance";
MethodDesc targetCanonMethod = targetMethod.GetCanonMethodTarget(CanonicalFormKind.Specific);
TargetKind kind;
if (targetMethod.HasInstantiation)
{
if (followVirtualDispatch && targetMethod.IsVirtual)
{
initializeMethodName = "InitializeClosedInstanceWithGVMResolution";
kind = TargetKind.MethodHandle;
}
else
{
if (targetMethod != targetCanonMethod)
{
// Closed delegates to generic instance methods need to be constructed through a slow helper that
// checks for the fat function pointer case (function pointer + instantiation argument in a single
// pointer) and injects an invocation thunk to unwrap the fat function pointer as part of
// the invocation if necessary.
initializeMethodName = "InitializeClosedInstanceSlow";
}
kind = TargetKind.ExactCallableAddress;
}
}
else
{
if (followVirtualDispatch && targetMethod.IsVirtual)
{
if (targetMethod.OwningType.IsInterface)
{
kind = TargetKind.InterfaceDispatch;
initializeMethodName = "InitializeClosedInstanceToInterface";
}
else
{
kind = TargetKind.VTableLookup;
targetMethod = targetMethod.GetCanonMethodTarget(CanonicalFormKind.Specific);
}
}
else
{
kind = TargetKind.CanonicalEntrypoint;
targetMethod = targetMethod.GetCanonMethodTarget(CanonicalFormKind.Specific);
}
}
return(new DelegateCreationInfo(
factory.MethodEntrypoint(systemDelegate.GetKnownMethod(initializeMethodName, null)),
targetMethod,
kind));
}
}
/// <summary>
/// Constructs a new instance of <see cref="DelegateCreationInfo"/> set up to construct a delegate of type
/// '<paramref name="delegateType"/>' pointing to '<paramref name="targetMethod"/>'.
/// </summary>
public static DelegateCreationInfo Create(TypeDesc delegateType, MethodDesc targetMethod, NodeFactory factory)
{
CompilerTypeSystemContext context = factory.TypeSystemContext;
DefType systemDelegate = targetMethod.Context.GetWellKnownType(WellKnownType.MulticastDelegate).BaseType;
int paramCountTargetMethod = targetMethod.Signature.Length;
if (!targetMethod.Signature.IsStatic)
{
paramCountTargetMethod++;
}
DelegateInfo delegateInfo = context.GetDelegateInfo(delegateType.GetTypeDefinition());
int paramCountDelegateClosed = delegateInfo.Signature.Length + 1;
bool closed = false;
if (paramCountDelegateClosed == paramCountTargetMethod)
{
closed = true;
}
else
{
Debug.Assert(paramCountDelegateClosed == paramCountTargetMethod + 1);
}
if (targetMethod.Signature.IsStatic)
{
MethodDesc invokeThunk;
MethodDesc initMethod;
if (!closed)
{
// Open delegate to a static method
if (targetMethod.IsNativeCallable)
{
// If target method is native callable, create a reverse PInvoke delegate
initMethod = systemDelegate.GetKnownMethod("InitializeReversePInvokeThunk", null);
invokeThunk = delegateInfo.Thunks[DelegateThunkKind.ReversePinvokeThunk];
// You might hit this when the delegate is generic: you need to make the delegate non-generic.
// If the code works on Project N, it's because the delegate is used in connection with
// AddrOf intrinsic (please validate that). We don't have the necessary AddrOf expansion in
// the codegen to make this work without actually constructing the delegate. You can't construct
// the delegate if it's generic, even on Project N.
// TODO: Make this throw something like "TypeSystemException.InvalidProgramException"?
Debug.Assert(invokeThunk != null, "Delegate with a non-native signature for a NativeCallable method");
}
else
{
initMethod = systemDelegate.GetKnownMethod("InitializeOpenStaticThunk", null);
invokeThunk = delegateInfo.Thunks[DelegateThunkKind.OpenStaticThunk];
}
}
else
{
// Closed delegate to a static method (i.e. delegate to an extension method that locks the first parameter)
invokeThunk = delegateInfo.Thunks[DelegateThunkKind.ClosedStaticThunk];
initMethod = systemDelegate.GetKnownMethod("InitializeClosedStaticThunk", null);
}
var instantiatedDelegateType = delegateType as InstantiatedType;
if (instantiatedDelegateType != null)
{
invokeThunk = context.GetMethodForInstantiatedType(invokeThunk, instantiatedDelegateType);
}
return(new DelegateCreationInfo(
factory.MethodEntrypoint(initMethod),
factory.MethodEntrypoint(targetMethod),
factory.MethodEntrypoint(invokeThunk)));
}
else
{
if (!closed)
{
throw new NotImplementedException("Open instance delegates");
}
bool useUnboxingStub = targetMethod.OwningType.IsValueType;
IMethodNode targetMethodNode;
string initializeMethodName = "InitializeClosedInstance";
MethodDesc targetCanonMethod = targetMethod.GetCanonMethodTarget(CanonicalFormKind.Specific);
if (targetMethod.HasInstantiation)
{
Debug.Assert(!targetMethod.IsVirtual, "TODO: delegate to generic virtual method");
if (targetMethod != targetCanonMethod)
{
// Closed delegates to generic instance methods need to be constructed through a slow helper that
// checks for the fat function pointer case (function pointer + instantiation argument in a single
// pointer) and injects an invocation thunk to unwrap the fat function pointer as part of
// the invocation if necessary.
initializeMethodName = "InitializeClosedInstanceSlow";
targetMethodNode = factory.FatFunctionPointer(targetMethod, useUnboxingStub);
}
else
{
targetMethodNode = factory.MethodEntrypoint(targetMethod, useUnboxingStub);
}
}
else
{
// If the method can be canonicalized, point to the canon method body, but track the dependencies.
if (targetMethod != targetCanonMethod)
{
targetMethodNode = factory.ShadowConcreteMethod(targetMethod, useUnboxingStub);
}
else
{
targetMethodNode = factory.MethodEntrypoint(targetMethod, useUnboxingStub);
}
}
return(new DelegateCreationInfo(
factory.MethodEntrypoint(systemDelegate.GetKnownMethod(initializeMethodName, null)),
targetMethodNode));
}
}
