private static (bool definitelyManaged, bool hasGenerics) DependsOnDefinitelyManagedType(NamedTypeSymbol type, HashSet <Symbol> partialClosure, ref HashSet <DiagnosticInfo> useSiteDiagnostics)
{
Debug.Assert((object)type != null);
var hasGenerics = false;
if (partialClosure.Add(type))
{
foreach (var member in type.GetInstanceFieldsAndEvents())
{
// Only instance fields (including field-like events) affect the outcome.
FieldSymbol field;
switch (member.Kind)
{
case SymbolKind.Field:
field = (FieldSymbol)member;
Debug.Assert((object)(field.AssociatedSymbol as EventSymbol) == null,
"Didn't expect to find a field-like event backing field in the member list.");
break;
case SymbolKind.Event:
field = ((EventSymbol)member).AssociatedField;
break;
default:
throw ExceptionUtilities.UnexpectedValue(member.Kind);
}
if ((object)field == null)
{
continue;
}
TypeSymbol fieldType = field.NonPointerType();
if (fieldType is null)
{
// pointers are unmanaged
continue;
}
fieldType.AddUseSiteDiagnostics(ref useSiteDiagnostics);
NamedTypeSymbol fieldNamedType = fieldType as NamedTypeSymbol;
if ((object)fieldNamedType == null)
{
if (fieldType.IsManagedType(ref useSiteDiagnostics))
{
return(true, hasGenerics);
}
}
else
{
var result = IsManagedTypeHelper(fieldNamedType);
hasGenerics = hasGenerics || result.hasGenerics;
// NOTE: don't use ManagedKind.get on a NamedTypeSymbol - that could lead
// to infinite recursion.
switch (result.isManaged)
{
case ThreeState.True:
return(true, hasGenerics);
case ThreeState.False:
continue;
case ThreeState.Unknown:
if (!fieldNamedType.OriginalDefinition.KnownCircularStruct)
{
var(definitelyManaged, childHasGenerics) = DependsOnDefinitelyManagedType(fieldNamedType, partialClosure, ref useSiteDiagnostics);
hasGenerics = hasGenerics || childHasGenerics;
if (definitelyManaged)
{
return(true, hasGenerics);
}
}
continue;
}
}
}
}
return(false, hasGenerics);
}
