public EXPRTHISPOINTER CreateThis(LocalVariableSymbol pLocal, bool fImplicit)
{
Debug.Assert(pLocal == null || pLocal.isThis);
CType type = null;
if (pLocal != null)
{
type = pLocal.GetType();
}
EXPRFLAG flags = EXPRFLAG.EXF_CANTBENULL;
if (fImplicit)
{
flags |= EXPRFLAG.EXF_IMPLICITTHIS;
}
if (type != null && type.isStructType())
{
flags |= EXPRFLAG.EXF_LVALUE;
}
EXPRTHISPOINTER rval = new EXPRTHISPOINTER();
rval.kind = ExpressionKind.EK_THISPOINTER;
rval.type = type;
rval.flags = flags;
rval.local = pLocal;
Debug.Assert(rval != null);
return(rval);
}
////////////////////////////////////////////////////////////////////////////////
private bool UpperBoundInterfaceInference(AggregateType pSource, CType pDest)
{
if (!pSource.isInterfaceType())
{
return false;
}
// SPEC: Otherwise, if U is an interface CType C<U1...Uk> and V is a class CType
// SPEC: or struct CType and there is a unique set V1...Vk such that V directly
// SPEC: or indirectly implements C<V1...Vk> then an exact ...
// SPEC: ... and U is an interface CType ...
if (!pDest.isStructType() && !pDest.isClassType() &&
!pDest.isInterfaceType())
{
return false;
}
var interfaces = pDest.AllPossibleInterfaces();
AggregateType pInterface = null;
foreach (AggregateType pCurrent in interfaces)
{
if (pCurrent.GetOwningAggregate() == pSource.GetOwningAggregate())
{
if (pInterface == null)
{
pInterface = pCurrent;
}
else if (pInterface != pCurrent)
{
// Not unique. Bail out.
return false;
}
}
}
if (pInterface == null)
{
return false;
}
UpperBoundTypeArgumentInference(pInterface, pDest.AsAggregateType());
return true;
}
////////////////////////////////////////////////////////////////////////////////
private bool LowerBoundInterfaceInference(CType pSource, AggregateType pDest)
{
if (!pDest.isInterfaceType())
{
return false;
}
// SPEC: Otherwise, if V is an interface CType C<V1...Vk> and U is a class CType
// SPEC: or struct CType and there is a unique set U1...Uk such that U directly
// SPEC: or indirectly implements C<U1...Uk> then an
// SPEC: exact, upper-bound, or lower-bound inference ...
// SPEC: ... and U is an interface CType ...
// SPEC: ... and U is a CType parameter ...
//TypeArray pInterfaces = null;
if (!pSource.isStructType() && !pSource.isClassType() &&
!pSource.isInterfaceType() && !pSource.IsTypeParameterType())
{
return false;
}
var interfaces = pSource.AllPossibleInterfaces();
AggregateType pInterface = null;
foreach (AggregateType pCurrent in interfaces)
{
if (pCurrent.GetOwningAggregate() == pDest.GetOwningAggregate())
{
if (pInterface == null)
{
pInterface = pCurrent;
}
else if (pInterface != pCurrent)
{
// Not unique. Bail out.
return false;
}
}
}
if (pInterface == null)
{
return false;
}
LowerBoundTypeArgumentInference(pInterface, pDest);
return true;
}
private AggregateType GetUserDefinedBinopArgumentType(CType type)
{
for (; ;)
{
switch (type.GetTypeKind())
{
case TypeKind.TK_NullableType:
type = type.StripNubs();
break;
case TypeKind.TK_TypeParameterType:
type = type.AsTypeParameterType().GetEffectiveBaseClass();
break;
case TypeKind.TK_AggregateType:
if ((type.isClassType() || type.isStructType()) && !type.AsAggregateType().getAggregate().IsSkipUDOps())
{
return type.AsAggregateType();
}
return null;
default:
return null;
}
}
}