public virtual bool CheckTypeAccess(CType type, Symbol symWhere)
{
Debug.Assert(type != null);
// Array, Ptr, Nub, etc don't matter.
type = type.GetNakedType(true);
if (!type.IsAggregateType())
{
Debug.Assert(type.IsVoidType() || type.IsErrorType() || type.IsTypeParameterType());
return(true);
}
for (AggregateType ats = type.AsAggregateType(); ats != null; ats = ats.outerType)
{
if (ACCESSERROR.ACCESSERROR_NOERROR != CheckAccessCore(ats.GetOwningAggregate(), ats.outerType, symWhere, null))
{
return(false);
}
}
TypeArray typeArgs = type.AsAggregateType().GetTypeArgsAll();
for (int i = 0; i < typeArgs.size; i++)
{
if (!CheckTypeAccess(typeArgs.Item(i), symWhere))
{
return(false);
}
}
return(true);
}
private AggCastResult bindExplicitConversionToAggregate(AggregateType aggTypeDest)
{
Debug.Assert(_typeSrc != null);
Debug.Assert(aggTypeDest != null);
// TypeReference and ArgIterator can't be boxed (or converted to anything else)
if (_typeSrc.isSpecialByRefType())
{
return(AggCastResult.Abort);
}
AggCastResult result;
result = bindExplicitConversionFromEnumToAggregate(aggTypeDest);
if (result != AggCastResult.Failure)
{
return(result);
}
result = bindExplicitConversionToEnum(aggTypeDest);
if (result != AggCastResult.Failure)
{
return(result);
}
result = bindExplicitConversionBetweenSimpleTypes(aggTypeDest);
if (result != AggCastResult.Failure)
{
return(result);
}
result = bindExplicitConversionBetweenAggregates(aggTypeDest);
if (result != AggCastResult.Failure)
{
return(result);
}
result = bindExplicitConversionFromPointerToInt(aggTypeDest);
if (result != AggCastResult.Failure)
{
return(result);
}
if (_typeSrc.IsVoidType())
{
// No conversion is allowed to or from a void type (user defined or otherwise)
// This is most likely the result of a failed anonymous method or member group conversion
return(AggCastResult.Abort);
}
result = bindExplicitConversionFromTypeVarToAggregate(aggTypeDest);
if (result != AggCastResult.Failure)
{
return(result);
}
return(AggCastResult.Failure);
}
public virtual bool CheckTypeAccess(CType type, Symbol symWhere)
{
Debug.Assert(type != null);
// Array, Ptr, Nub, etc don't matter.
type = type.GetNakedType(true);
if (!type.IsAggregateType())
{
Debug.Assert(type.IsVoidType() || type.IsErrorType() || type.IsTypeParameterType());
return true;
}
for (AggregateType ats = type.AsAggregateType(); ats != null; ats = ats.outerType)
{
if (ACCESSERROR.ACCESSERROR_NOERROR != CheckAccessCore(ats.GetOwningAggregate(), ats.outerType, symWhere, null))
{
return false;
}
}
TypeArray typeArgs = type.AsAggregateType().GetTypeArgsAll();
for (int i = 0; i < typeArgs.size; i++)
{
if (!CheckTypeAccess(typeArgs.Item(i), symWhere))
return false;
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
private static bool IsReallyAType(CType pType)
{
if (pType.IsNullType() || pType.IsBoundLambdaType() ||
pType.IsVoidType() ||
pType.IsMethodGroupType())
{
return false;
}
return true;
}
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
// RUNTIME BINDER ONLY CHANGE
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
internal bool GetBestAccessibleType(CSemanticChecker semanticChecker, BindingContext bindingContext, CType typeSrc, out CType typeDst)
{
// This method implements the "best accessible type" algorithm for determining the type
// of untyped arguments in the runtime binder. It is also used in method type inference
// to fix type arguments to types that are accessible.
// The new type is returned in an out parameter. The result will be true (and the out param
// non-null) only when the algorithm could find a suitable accessible type.
Debug.Assert(semanticChecker != null);
Debug.Assert(bindingContext != null);
Debug.Assert(typeSrc != null);
typeDst = null;
if (semanticChecker.CheckTypeAccess(typeSrc, bindingContext.ContextForMemberLookup()))
{
// If we already have an accessible type, then use it. This is the terminal point of the recursion.
typeDst = typeSrc;
return true;
}
// These guys have no accessibility concerns.
Debug.Assert(!typeSrc.IsVoidType() && !typeSrc.IsErrorType() && !typeSrc.IsTypeParameterType());
if (typeSrc.IsParameterModifierType() || typeSrc.IsPointerType())
{
// We cannot vary these.
return false;
}
CType intermediateType;
if ((typeSrc.isInterfaceType() || typeSrc.isDelegateType()) && TryVarianceAdjustmentToGetAccessibleType(semanticChecker, bindingContext, typeSrc.AsAggregateType(), out intermediateType))
{
// If we have an interface or delegate type, then it can potentially be varied by its type arguments
// to produce an accessible type, and if that's the case, then return that.
// Example: IEnumerable<PrivateConcreteFoo> --> IEnumerable<PublicAbstractFoo>
typeDst = intermediateType;
Debug.Assert(semanticChecker.CheckTypeAccess(typeDst, bindingContext.ContextForMemberLookup()));
return true;
}
if (typeSrc.IsArrayType() && TryArrayVarianceAdjustmentToGetAccessibleType(semanticChecker, bindingContext, typeSrc.AsArrayType(), out intermediateType))
{
// Similarly to the interface and delegate case, arrays are covariant in their element type and
// so we can potentially produce an array type that is accessible.
// Example: PrivateConcreteFoo[] --> PublicAbstractFoo[]
typeDst = intermediateType;
Debug.Assert(semanticChecker.CheckTypeAccess(typeDst, bindingContext.ContextForMemberLookup()));
return true;
}
if (typeSrc.IsNullableType())
{
// We have an inaccessible nullable type, which means that the best we can do is System.ValueType.
typeDst = this.GetOptPredefAgg(PredefinedType.PT_VALUE).getThisType();
Debug.Assert(semanticChecker.CheckTypeAccess(typeDst, bindingContext.ContextForMemberLookup()));
return true;
}
if (typeSrc.IsArrayType())
{
// We have an inaccessible array type for which we could not earlier find a better array type
// with a covariant conversion, so the best we can do is System.Array.
typeDst = this.GetReqPredefAgg(PredefinedType.PT_ARRAY).getThisType();
Debug.Assert(semanticChecker.CheckTypeAccess(typeDst, bindingContext.ContextForMemberLookup()));
return true;
}
Debug.Assert(typeSrc.IsAggregateType());
if (typeSrc.IsAggregateType())
{
// We have an AggregateType, so recurse on its base class.
AggregateType aggType = typeSrc.AsAggregateType();
AggregateType baseType = aggType.GetBaseClass();
if (baseType == null)
{
// This happens with interfaces, for instance. But in that case, the
// conversion to object does exist, is an implicit reference conversion,
// and so we will use it.
baseType = this.GetReqPredefAgg(PredefinedType.PT_OBJECT).getThisType();
}
return GetBestAccessibleType(semanticChecker, bindingContext, baseType, out typeDst);
}
return false;
}