private unsafe static IntPtr ResolveCallOnReferenceTypeCacheMiss(IntPtr context, IntPtr callDescIntPtr, object contextObject, out IntPtr auxResult)
{
auxResult = IntPtr.Zero;
// Perform a normal GVM dispatch, then change the function pointer to dereference the this pointer.
GenericConstrainedCallDesc *callDesc = (GenericConstrainedCallDesc *)callDescIntPtr;
IntPtr target = RuntimeAugments.GVMLookupForSlot(contextObject.GetType().TypeHandle, callDesc->_constrainedMethod);
if (FunctionPointerOps.IsGenericMethodPointer(target))
{
GenericMethodDescriptor *genMethodDesc = FunctionPointerOps.ConvertToGenericDescriptor(target);
IntPtr actualCodeTarget = GetThunkThatDereferencesThisPointerAndTailCallsTarget(genMethodDesc->MethodFunctionPointer);
return(FunctionPointerOps.GetGenericMethodFunctionPointer(actualCodeTarget, genMethodDesc->InstantiationArgument));
}
else
{
return(GetThunkThatDereferencesThisPointerAndTailCallsTarget(target));
}
}
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);
}