src/Common/src/TypeSystem/Common/FieldDesc.cs


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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.Runtime.CompilerServices;

using Debug = System.Diagnostics.Debug;

namespace Internal.TypeSystem
{
    public abstract partial class FieldDesc
    {
        public readonly static FieldDesc[] EmptyFields = new FieldDesc[0];

        public override int GetHashCode()
        {
            // Inherited types are expected to override
            return RuntimeHelpers.GetHashCode(this);
        }

        public override bool Equals(Object o)
        {
            // Its only valid to compare two FieldDescs in the same context
            Debug.Assert(Object.ReferenceEquals(o, null) || !(o is FieldDesc) || Object.ReferenceEquals(((FieldDesc)o).Context, this.Context));
            return Object.ReferenceEquals(this, o);
        }

        public virtual string Name
        {
            get
            {
                return null;
            }
        }

        public abstract TypeSystemContext Context
        {
            get;
        }

        public abstract DefType OwningType
        {
            get;
        }

        public abstract TypeDesc FieldType
        {
            get;
        }

        public abstract bool IsStatic
        {
            get;
        }

        public abstract bool IsInitOnly
        {
            get;
        }

        public abstract bool IsThreadStatic
        {
            get;
        }

        public abstract bool HasRva
        {
            get;
        }

        public abstract bool IsLiteral
        {
            get;
        }

        public abstract bool HasCustomAttribute(string attributeNamespace, string attributeName);

        public virtual FieldDesc GetTypicalFieldDefinition()
        {
            return this;
        }

        public virtual FieldDesc InstantiateSignature(Instantiation typeInstantiation, Instantiation methodInstantiation)
        {
            FieldDesc field = this;

            TypeDesc owningType = field.OwningType;
            TypeDesc instantiatedOwningType = owningType.InstantiateSignature(typeInstantiation, methodInstantiation);
            if (owningType != instantiatedOwningType)
                field = instantiatedOwningType.Context.GetFieldForInstantiatedType(field.GetTypicalFieldDefinition(), (InstantiatedType)instantiatedOwningType);

            return field;
        }
    }
}