obfuz/Plugins/dnlib/DotNet/ModuleRef.cs

// dnlib: See LICENSE.txt for more info

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using dnlib.DotNet.MD;
using dnlib.DotNet.Pdb;

namespace dnlib.DotNet {
	/// <summary>
	/// A high-level representation of a row in the ModuleRef table
	/// </summary>
	public abstract class ModuleRef : IHasCustomAttribute, IMemberRefParent, IHasCustomDebugInformation, IResolutionScope, IModule, IOwnerModule {
		/// <summary>
		/// The row id in its table
		/// </summary>
		protected uint rid;

		/// <summary>
		/// The owner module
		/// </summary>
		protected ModuleDef module;

		/// <inheritdoc/>
		public MDToken MDToken => new MDToken(Table.ModuleRef, rid);

		/// <inheritdoc/>
		public uint Rid {
			get => rid;
			set => rid = value;
		}

		/// <inheritdoc/>
		public int HasCustomAttributeTag => 12;

		/// <inheritdoc/>
		public int MemberRefParentTag => 2;

		/// <inheritdoc/>
		public int ResolutionScopeTag => 1;

		/// <inheritdoc/>
		public ScopeType ScopeType => ScopeType.ModuleRef;

		/// <inheritdoc/>
		public string ScopeName => FullName;

		/// <summary>
		/// From column ModuleRef.Name
		/// </summary>
		public UTF8String Name {
			get => name;
			set => name = value;
		}
		/// <summary>Name</summary>
		protected UTF8String name;

		/// <summary>
		/// Gets all custom attributes
		/// </summary>
		public CustomAttributeCollection CustomAttributes {
			get {
				if (customAttributes is null)
					InitializeCustomAttributes();
				return customAttributes;
			}
		}
		/// <summary/>
		protected CustomAttributeCollection customAttributes;
		/// <summary>Initializes <see cref="customAttributes"/></summary>
		protected virtual void InitializeCustomAttributes() =>
			Interlocked.CompareExchange(ref customAttributes, new CustomAttributeCollection(), null);

		/// <inheritdoc/>
		public bool HasCustomAttributes => CustomAttributes.Count > 0;

		/// <inheritdoc/>
		public int HasCustomDebugInformationTag => 12;

		/// <inheritdoc/>
		public bool HasCustomDebugInfos => CustomDebugInfos.Count > 0;

		/// <summary>
		/// Gets all custom debug infos
		/// </summary>
		public IList<PdbCustomDebugInfo> CustomDebugInfos {
			get {
				if (customDebugInfos is null)
					InitializeCustomDebugInfos();
				return customDebugInfos;
			}
		}
		/// <summary/>
		protected IList<PdbCustomDebugInfo> customDebugInfos;
		/// <summary>Initializes <see cref="customDebugInfos"/></summary>
		protected virtual void InitializeCustomDebugInfos() =>
			Interlocked.CompareExchange(ref customDebugInfos, new List<PdbCustomDebugInfo>(), null);

		/// <inheritdoc/>
		public ModuleDef Module => module;

		/// <summary>
		/// Gets the definition module, i.e., the module which it references, or <c>null</c>
		/// if the module can't be found.
		/// </summary>
		public ModuleDef DefinitionModule {
			get {
				if (module is null)
					return null;
				var n = name;
				if (UTF8String.CaseInsensitiveEquals(n, module.Name))
					return module;
				return DefinitionAssembly?.FindModule(n);
			}
		}

		/// <summary>
		/// Gets the definition assembly, i.e., the assembly of the module it references, or
		/// <c>null</c> if the assembly can't be found.
		/// </summary>
		public AssemblyDef DefinitionAssembly => module?.Assembly;

		/// <inheritdoc/>
		public string FullName => UTF8String.ToSystemStringOrEmpty(name);

		/// <inheritdoc/>
		public override string ToString() => FullName;
	}

	/// <summary>
	/// A ModuleRef row created by the user and not present in the original .NET file
	/// </summary>
	public class ModuleRefUser : ModuleRef {
		/// <summary>
		/// Constructor
		/// </summary>
		/// <param name="module">Owner module</param>
		public ModuleRefUser(ModuleDef module)
			: this(module, UTF8String.Empty) {
		}

		/// <summary>
		/// Constructor
		/// </summary>
		/// <param name="module">Owner module</param>
		/// <param name="name">Module name</param>
		public ModuleRefUser(ModuleDef module, UTF8String name) {
			this.module = module;
			this.name = name;
		}
	}

	/// <summary>
	/// Created from a row in the ModuleRef table
	/// </summary>
	sealed class ModuleRefMD : ModuleRef, IMDTokenProviderMD {
		/// <summary>The module where this instance is located</summary>
		readonly ModuleDefMD readerModule;

		readonly uint origRid;

		/// <inheritdoc/>
		public uint OrigRid => origRid;

		/// <inheritdoc/>
		protected override void InitializeCustomAttributes() {
			var list = readerModule.Metadata.GetCustomAttributeRidList(Table.ModuleRef, origRid);
			var tmp = new CustomAttributeCollection(list.Count, list, (list2, index) => readerModule.ReadCustomAttribute(list[index]));
			Interlocked.CompareExchange(ref customAttributes, tmp, null);
		}

		/// <inheritdoc/>
		protected override void InitializeCustomDebugInfos() {
			var list = new List<PdbCustomDebugInfo>();
			readerModule.InitializeCustomDebugInfos(new MDToken(MDToken.Table, origRid), new GenericParamContext(), list);
			Interlocked.CompareExchange(ref customDebugInfos, list, null);
		}

		/// <summary>
		/// Constructor
		/// </summary>
		/// <param name="readerModule">The module which contains this <c>ModuleRef</c> row</param>
		/// <param name="rid">Row ID</param>
		/// <exception cref="ArgumentNullException">If <paramref name="readerModule"/> is <c>null</c></exception>
		/// <exception cref="ArgumentException">If <paramref name="rid"/> is invalid</exception>
		public ModuleRefMD(ModuleDefMD readerModule, uint rid) {
#if DEBUG
			if (readerModule is null)
				throw new ArgumentNullException("readerModule");
			if (readerModule.TablesStream.ModuleRefTable.IsInvalidRID(rid))
				throw new BadImageFormatException($"ModuleRef rid {rid} does not exist");
#endif
			origRid = rid;
			this.rid = rid;
			this.readerModule = readerModule;
			module = readerModule;
			bool b = readerModule.TablesStream.TryReadModuleRefRow(origRid, out var row);
			Debug.Assert(b);
			name = readerModule.StringsStream.ReadNoNull(row.Name);
		}
	}
}