void CheckBaseTypes(ClassDefinition node)
{
IType baseClass = null;
foreach (TypeReference baseTypeRef in node.BaseTypes)
{
IType baseType = GetType(baseTypeRef);
if (baseType.IsInterface)
{
continue;
}
if (null != baseClass)
{
Error(CompilerErrorFactory.ClassAlreadyHasBaseType(baseTypeRef, node.Name, baseClass));
continue;
}
baseClass = baseType;
if (baseClass.IsFinal && !TypeSystemServices.IsError(baseClass))
{
Error(CompilerErrorFactory.CannotExtendFinalType(baseTypeRef, baseClass));
}
}
if (null == baseClass)
{
node.BaseTypes.Insert(0, CodeBuilder.CreateTypeReference(TypeSystemServices.ObjectType));
}
}
public void ResolveArrayTypeReference(ArrayTypeReference node)
{
if (null != node.Entity)
{
return;
}
ResolveTypeReference(node.ElementType);
IType elementType = TypeSystemServices.GetType(node.ElementType);
if (TypeSystemServices.IsError(elementType))
{
node.Entity = TypeSystemServices.ErrorEntity;
}
else
{
int rank = null == node.Rank ? 1 : (int)node.Rank.Value;
node.Entity = elementType.MakeArrayType(rank);
}
}
/// <summary>
/// Constructs an entity from a generic definition and arguments, after ensuring the construction is valid.
/// </summary>
/// <param name="definition">The generic definition entity.</param>
/// <param name="constructionNode">The node in which construction occurs.</param>
/// <param name="typeArguments">The generic type arguments to substitute for generic parameters.</param>
/// <returns>The constructed entity.</returns>
public IEntity ConstructEntity(Node constructionNode, IEntity definition, IType[] typeArguments)
{
// Ensure definition is a valid entity
if (definition == null || TypeSystemServices.IsError(definition))
{
return(TypeSystemServices.ErrorEntity);
}
// Ambiguous generic constructions are handled separately
if (definition.EntityType == EntityType.Ambiguous)
{
return(ConstructAmbiguousEntity(constructionNode, (Ambiguous)definition, typeArguments));
}
// Check that the construction is valid
if (!CheckGenericConstruction(constructionNode, definition, typeArguments, true))
{
return(TypeSystemServices.ErrorEntity);
}
return(MakeGenericEntity(definition, typeArguments));
}
private bool MaintainsParameterConstraints(IGenericParameter parameter, IType argument)
{
if (argument == null || TypeSystemServices.IsError(argument))
{
return(true);
}
if (argument == parameter)
{
return(true);
}
if (argument == _typeSystemServices.VoidType)
{
Errors.Add(CompilerErrorFactory.InvalidGenericParameterType(ConstructionNode, argument));
return(false);
}
bool valid = true;
// Check type semantics constraints
if (parameter.IsClass && !(argument.IsClass || argument.IsInterface))
{
Errors.Add(CompilerErrorFactory.GenericArgumentMustBeReferenceType(ConstructionNode, parameter, argument));
valid = false;
}
if (parameter.IsValueType && !argument.IsValueType)
{
Errors.Add(CompilerErrorFactory.GenericArgumentMustBeValueType(ConstructionNode, parameter, argument));
valid = false;
}
// Don't check for default constructor constraint if value type constraint failed
else if (parameter.MustHaveDefaultConstructor && !HasDefaultConstructor(argument))
{
Errors.Add(CompilerErrorFactory.GenericArgumentMustHaveDefaultConstructor(ConstructionNode, parameter, argument));
valid = false;
}
// Check base type constraints
IType[] baseTypes = parameter.GetTypeConstraints();
if (baseTypes != null)
{
foreach (IType baseType in baseTypes)
{
// Foo<T> where T : Foo<T>
if (null != _definition &&
TypeCompatibilityRules.IsAssignableFrom(baseType, _definition) &&
argument == _constructionNode.ParentNode.Entity)
{
continue;
}
// Don't check for System.ValueType supertype constraint
// if parameter also has explicit value type constraint
if (baseType == _typeSystemServices.ValueTypeType && parameter.IsValueType)
{
continue;
}
if (!TypeCompatibilityRules.IsAssignableFrom(baseType, argument))
{
Errors.Add(CompilerErrorFactory.GenericArgumentMustHaveBaseType(ConstructionNode, parameter, argument, baseType));
valid = false;
}
}
}
return(valid);
}
private static bool IsError(IEntity entity)
{
return(TypeSystemServices.IsError(entity));
}