Pchp.CodeAnalysis.Symbols.AssemblySymbol.GetDeclaredSpecialTypeMember C# (CSharp) Method

        internal Symbol GetDeclaredSpecialTypeMember(SpecialMember member)
        {
            if (_lazySpecialTypeMembers == null || ReferenceEquals(_lazySpecialTypeMembers[(int)member], ErrorTypeSymbol.UnknownResultType))
            {
                if (_lazySpecialTypeMembers == null)
                {
                    var specialTypeMembers = new Symbol[(int)SpecialMember.Count];

                    for (int i = 0; i < specialTypeMembers.Length; i++)
                    {
                        specialTypeMembers[i] = ErrorTypeSymbol.UnknownResultType;
                    }

                    Interlocked.CompareExchange(ref _lazySpecialTypeMembers, specialTypeMembers, null);
                }

                var descriptor = SpecialMembers.GetDescriptor(member);
                NamedTypeSymbol type = GetDeclaredSpecialType((SpecialType)descriptor.DeclaringTypeId);
                Symbol result = null;

                if (!type.IsErrorType())
                {
                    result = PhpCompilation.GetRuntimeMember(type, ref descriptor, PhpCompilation.SpecialMembersSignatureComparer.Instance, null);
                }

                Interlocked.CompareExchange(ref _lazySpecialTypeMembers[(int)member], result, ErrorTypeSymbol.UnknownResultType);
            }

            return _lazySpecialTypeMembers[(int)member];
        }