private static ParameterSymbol GetThisParameter(TypeSymbol typeOfThis, NamedTypeSymbol containingType, Symbol containingMember, out LookupResultKind resultKind)
{
if ((object)containingMember == null || (object)containingType == null)
{
// not in a member of a type (can happen when speculating)
resultKind = LookupResultKind.NotReferencable;
return new ThisParameterSymbol(containingMember as MethodSymbol, typeOfThis);
}
ParameterSymbol thisParam;
switch (containingMember.Kind)
{
case SymbolKind.Method:
case SymbolKind.Field:
case SymbolKind.Property:
if (containingMember.IsStatic)
{
// in a static member
resultKind = LookupResultKind.StaticInstanceMismatch;
thisParam = new ThisParameterSymbol(containingMember as MethodSymbol, containingType);
}
else
{
if ((object)typeOfThis == ErrorTypeSymbol.UnknownResultType)
{
// in an instance member, but binder considered this/base unreferenceable
thisParam = new ThisParameterSymbol(containingMember as MethodSymbol, containingType);
resultKind = LookupResultKind.NotReferencable;
}
else
{
switch (containingMember.Kind)
{
case SymbolKind.Method:
resultKind = LookupResultKind.Viable;
thisParam = containingMember.EnclosingThisSymbol();
break;
// Fields and properties can't access 'this' since
// initializers are run in the constructor
case SymbolKind.Field:
case SymbolKind.Property:
resultKind = LookupResultKind.NotReferencable;
thisParam = containingMember.EnclosingThisSymbol() ?? new ThisParameterSymbol(null, containingType);
break;
default:
throw ExceptionUtilities.UnexpectedValue(containingMember.Kind);
}
}
}
break;
default:
thisParam = new ThisParameterSymbol(containingMember as MethodSymbol, typeOfThis);
resultKind = LookupResultKind.NotReferencable;
break;
}
return thisParam;
}