private static unsafe 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;
}
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);
}
