// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
using System;
using Mono.Cecil;
 
namespace Mono.Linker
{
    public static class TypeDefinitionExtensions
    {
        public static TypeReference GetEnumUnderlyingType(this TypeDefinition enumType)
        {
            foreach (var field in enumType.Fields)
            {
                if (!field.IsStatic)
                {
                    return field.FieldType;
                }
            }
 
            throw new MissingFieldException($"Enum type '{enumType.FullName}' is missing instance field");
        }
 
        public static bool IsMulticastDelegate(this TypeDefinition td)
        {
            return td.BaseType?.Name == "MulticastDelegate" && td.BaseType.Namespace == "System";
        }
 
        public static bool IsSerializable(this TypeDefinition td)
        {
            return (td.Attributes & TypeAttributes.Serializable) != 0;
        }
    }
}