/// <summary>
/// Return the set of display class instances that can be reached
/// from the given local. A particular display class may be reachable
/// from multiple locals. In those cases, the instance from the
/// shortest path (fewest intermediate fields) is returned.
/// </summary>
private static int GetDisplayClassInstances(
HashSet<NamedTypeSymbol> displayClassTypes,
ArrayBuilder<DisplayClassInstanceAndFields> displayClassInstances,
int depth)
{
Debug.Assert(displayClassInstances.All(p => p.Depth <= depth));
var atDepth = ArrayBuilder<DisplayClassInstanceAndFields>.GetInstance();
atDepth.AddRange(displayClassInstances.Where(p => p.Depth == depth));
Debug.Assert(atDepth.Count > 0);
int n = 0;
foreach (var instance in atDepth)
{
n += GetDisplayClassInstances(displayClassTypes, displayClassInstances, instance);
}
atDepth.Free();
return n;
}
