/// <summary>
/// This function is called from the lazy vtable resolver thunks via the UniversalTransitionThunk to compute
/// the correct resolution of a virtual dispatch.
/// </summary>
/// <param name="callerTransitionBlockParam">pointer to the arguments of the called function</param>
/// <param name="eeTypePointerOffsetAsIntPtr">eeTypePointerOffsetAsIntPtr is the offset from the start of the EEType to the vtable slot</param>
/// <returns>function pointer of correct override of virtual function</returns>
unsafe private static IntPtr VTableResolveThunk(IntPtr callerTransitionBlockParam, IntPtr eeTypePointerOffsetAsIntPtr)
{
int eeTypePointerOffset = (int)eeTypePointerOffsetAsIntPtr;
int vtableSlotIndex = EETypeVTableOffsetToSlotIndex(eeTypePointerOffset);
Debug.Assert(eeTypePointerOffset == SlotIndexToEETypeVTableOffset(vtableSlotIndex)); // Assert that the round trip through the slot calculations is good
EEType **thisPointer = *((EEType ***)(((byte *)callerTransitionBlockParam) + ArgIterator.GetThisOffset()));
EEType * eeType = *thisPointer;
RuntimeTypeHandle rth = eeType->ToRuntimeTypeHandle();
TypeSystemContext context = TypeSystemContextFactory.Create();
TypeDesc type = context.ResolveRuntimeTypeHandle(rth);
IntPtr functionPointer = ResolveVirtualVTableFunction(type, vtableSlotIndex);
eeType->GetVTableStartAddress()[vtableSlotIndex] = functionPointer;
TypeSystemContextFactory.Recycle(context);
return(functionPointer);
}
internal CallConversionParameters(CallConversionInfo conversionInfo, IntPtr callerTransitionBlockParam)
{
// Make sure the thred static variable has been initialized for this thread
s_pinnedGCHandles = s_pinnedGCHandles ?? new GCHandleContainer();
_conversionInfo = conversionInfo;
_callerTransitionBlock = (byte *)callerTransitionBlockParam.ToPointer();
_functionPointerToCall = conversionInfo.TargetFunctionPointer;
_instantiatingStubArgument = conversionInfo.InstantiatingStubArgument;
_delegateData = default(DelegateData);
_calleeArgs = default(ArgIterator);
_invokeReturnValue = IntPtr.Zero;
_copyReturnValue = true;
_dynamicInvokeParams = null;
_dynamicInvokeByRefObjectArgs = null;
//
// Setup input argument iterator for the caller
//
ArgIteratorData callerIteratorData;
if (conversionInfo.IsDelegateDynamicInvokeThunk)
{
callerIteratorData = s_delegateDynamicInvokeImplArgIteratorData;
}
else if (conversionInfo.IsReflectionDynamicInvokerThunk)
{
callerIteratorData = s_reflectionDynamicInvokeImplArgIteratorData;
}
else
{
callerIteratorData = conversionInfo.ArgIteratorData;
}
_callerArgs = new ArgIterator(callerIteratorData,
callerIteratorData.HasThis() ?
CallingConvention.ManagedInstance :
CallingConvention.ManagedStatic,
conversionInfo.CallerHasParamType,
conversionInfo.CallerHasExtraParameterWhichIsFunctionTarget,
conversionInfo.CallerForcedByRefData,
false, false); // Setup input
bool forceCalleeHasParamType = false;
// If the callee MAY have a param type, we need to know before we create the callee arg iterator
// To do this we need to actually load the target address and see if it has the generic method pointer
// bit set.
if (conversionInfo.CalleeMayHaveParamType)
{
ArgIterator callerArgsLookupTargetFunctionPointer = new ArgIterator(conversionInfo.ArgIteratorData,
conversionInfo.ArgIteratorData.HasThis() ?
CallingConvention.ManagedInstance :
CallingConvention.ManagedStatic,
conversionInfo.CallerHasParamType,
conversionInfo.CallerHasExtraParameterWhichIsFunctionTarget,
conversionInfo.CallerForcedByRefData,
false, false);
// Find the last valid caller offset. That's the offset of the target function pointer.
int ofsCallerValid = TransitionBlock.InvalidOffset;
while (true)
{
// Setup argument offsets.
int ofsCallerTemp = callerArgsLookupTargetFunctionPointer.GetNextOffset();
// Check to see if we've handled all the arguments that we are to pass to the callee.
if (TransitionBlock.InvalidOffset == ofsCallerTemp)
{
break;
}
ofsCallerValid = ofsCallerTemp;
}
if (ofsCallerValid == TransitionBlock.InvalidOffset)
{
throw new InvalidProgramException();
}
int stackSizeCaller = callerArgsLookupTargetFunctionPointer.GetArgSize();
Debug.Assert(stackSizeCaller == IntPtr.Size);
void * pSrc = _callerTransitionBlock + ofsCallerValid;
IntPtr tempFunctionPointer = *((IntPtr *)pSrc);
forceCalleeHasParamType = UpdateCalleeFunctionPointer(tempFunctionPointer);
}
// Retrieve target function pointer and instantiation argument for delegate thunks
if (conversionInfo.IsDelegateThunk)
{
Debug.Assert(_callerArgs.HasThis() && !_conversionInfo.IsUnboxingThunk);
IntPtr locationOfThisPointer = (IntPtr)(_callerTransitionBlock + ArgIterator.GetThisOffset());
_delegateData._delegateObject = (Delegate)Unsafe.As <IntPtr, Object>(ref *(IntPtr *)locationOfThisPointer);
Debug.Assert(_delegateData._delegateObject != null);
RuntimeAugments.GetDelegateData(
_delegateData._delegateObject,
out _delegateData._firstParameter,
out _delegateData._helperObject,
out _delegateData._extraFunctionPointerOrData,
out _delegateData._functionPointer);
if (conversionInfo.TargetDelegateFunctionIsExtraFunctionPointerOrDataField)
{
if (conversionInfo.IsOpenInstanceDelegateThunk)
{
_delegateData._boxedFirstParameter = BoxedCallerFirstArgument;
_callerArgs.Reset();
IntPtr resolvedTargetFunctionPointer = OpenMethodResolver.ResolveMethod(_delegateData._extraFunctionPointerOrData, _delegateData._boxedFirstParameter);
forceCalleeHasParamType = UpdateCalleeFunctionPointer(resolvedTargetFunctionPointer);
}
else
{
forceCalleeHasParamType = UpdateCalleeFunctionPointer(_delegateData._extraFunctionPointerOrData);
}
}
else if (conversionInfo.IsMulticastDelegate)
{
_delegateData._multicastTargetCount = (int)_delegateData._extraFunctionPointerOrData;
}
}
//
// Setup output argument iterator for the callee
//
_calleeArgs = new ArgIterator(conversionInfo.ArgIteratorData,
(conversionInfo.ArgIteratorData.HasThis() && !conversionInfo.IsStaticDelegateThunk) ?
CallingConvention.ManagedInstance :
CallingConvention.ManagedStatic,
forceCalleeHasParamType || conversionInfo.CalleeHasParamType,
false,
conversionInfo.CalleeForcedByRefData,
conversionInfo.IsOpenInstanceDelegateThunk,
conversionInfo.IsClosedStaticDelegate);
// The function pointer, 'hasParamType', and 'hasThis' flags for the callee arg iterator need to be computed/read from the caller's
// input arguments in the case of a reflection invoker thunk (the target method pointer and 'hasThis' flags are
// passed in as parameters from the caller, not loaded from a static method signature in native layout)
if (conversionInfo.IsReflectionDynamicInvokerThunk)
{
ComputeCalleeFlagsAndFunctionPointerForReflectionInvokeThunk();
}
#if CALLINGCONVENTION_CALLEE_POPS
// Ensure that the count of bytes in the stack is available
_callerArgs.CbStackPop();
#endif
}
