mcs/mcs/typespec.cs

   1 //
   2 // typespec.cs: Type specification
   3 //
   4 // Authors: Marek Safar (marek.safar@gmail.com)
   5 //
   6 // Dual licensed under the terms of the MIT X11 or GNU GPL
   7 //
   8 // Copyright 2010 Novell, Inc
   9 // Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
  10 //
  11
  12 using System;
  13 using System.Collections.Generic;
  14 using System.Text;
  15 using System.Linq;
  16
  17 #if STATIC
  18 using MetaType = IKVM.Reflection.Type;
  19 using IKVM.Reflection;
  20 #else
  21 using MetaType = System.Type;
  22 using System.Reflection;
  23 #endif
  24
  25 namespace Mono.CSharp
  26 {
  27         //
  28         // Inflated or non-inflated representation of any type.
  29         //
  30         public class TypeSpec : MemberSpec
  31         {
  32                 protected MetaType info;
  33                 protected MemberCache cache;
  34                 protected IList<TypeSpec> ifaces;
  35                 TypeSpec base_type;
  36
  37                 Dictionary<TypeSpec[], InflatedTypeSpec> inflated_instances;
  38
  39                 public static readonly TypeSpec[] EmptyTypes = new TypeSpec[0];
  40
  41 #if !STATIC
  42                 // Reflection Emit hacking
  43                 static readonly Type TypeBuilder;
  44                 static readonly Type GenericTypeBuilder;
  45
  46                 static TypeSpec ()
  47                 {
  48                         var assembly = typeof (object).Assembly;
  49                         TypeBuilder = assembly.GetType ("System.Reflection.Emit.TypeBuilder");
  50                         GenericTypeBuilder = assembly.GetType ("System.Reflection.MonoGenericClass");
  51                         if (GenericTypeBuilder == null)
  52                                 GenericTypeBuilder = assembly.GetType ("System.Reflection.Emit.TypeBuilderInstantiation");
  53                 }
  54 #endif
  55
  56                 public TypeSpec (MemberKind kind, TypeSpec declaringType, ITypeDefinition definition, MetaType info, Modifiers modifiers)
  57                         : base (kind, declaringType, definition, modifiers)
  58                 {
  59                         this.declaringType = declaringType;
  60                         this.info = info;
  61
  62                         if (definition != null && definition.TypeParametersCount > 0)
  63                                 state |= StateFlags.IsGeneric;
  64                 }
  65
  66                 #region Properties
  67
  68                 public override int Arity {
  69                         get {
  70                                 return MemberDefinition.TypeParametersCount;
  71                         }
  72                 }
  73
  74                 public virtual TypeSpec BaseType {
  75                         get {
  76                                 return base_type;
  77                         }
  78                         set {
  79                                 base_type = value;
  80                         }
  81                 }
  82
  83                 public virtual BuiltinTypeSpec.Type BuiltinType {
  84                         get {
  85                                 return BuiltinTypeSpec.Type.None;
  86                         }
  87                 }
  88
  89                 public bool HasDynamicElement {
  90                         get {
  91                                 return (state & StateFlags.HasDynamicElement) != 0;
  92                         }
  93                 }
  94
  95                 //
  96                 // Returns a list of all interfaces including
  97                 // interfaces from base type or base interfaces
  98                 //
  99                 public virtual IList<TypeSpec> Interfaces {
 100                         get {
 101                                 if ((state & StateFlags.InterfacesImported) == 0) {
 102                                         state |= StateFlags.InterfacesImported;
 103
 104                                         //
 105                                         // Delay interfaces expansion to save memory and once all
 106                                         // base types has been imported to avoid problems where
 107                                         // interface references type before its base was imported
 108                                         //
 109                                         var imported = MemberDefinition as ImportedTypeDefinition;
 110                                         if (imported != null && Kind != MemberKind.MissingType)
 111                                                 imported.DefineInterfaces (this);
 112
 113                                 }
 114
 115                                 return ifaces;
 116                         }
 117                         set {
 118                                 ifaces = value;
 119                         }
 120                 }
 121
 122                 public bool IsArray {
 123                         get {
 124                                 return Kind == MemberKind.ArrayType;
 125                         }
 126                 }
 127
 128                 public bool IsAttribute {
 129                         get {
 130                                 if (!IsClass)
 131                                         return false;
 132
 133                                 var type = this;
 134                                 do {
 135                                         if (type.BuiltinType == BuiltinTypeSpec.Type.Attribute)
 136                                                 return true;
 137
 138                                         if (type.IsGeneric)
 139                                                 return false;
 140
 141                                         type = type.base_type;
 142                                 } while (type != null);
 143
 144                                 return false;
 145                         }
 146                 }
 147
 148                 public bool IsInterface {
 149                         get {
 150                                 return Kind == MemberKind.Interface;
 151                         }
 152                 }
 153
 154                 public bool IsClass {
 155                         get {
 156                                 return Kind == MemberKind.Class;
 157                         }
 158                 }
 159
 160                 public bool IsConstantCompatible {
 161                         get {
 162                                 if ((Kind & (MemberKind.Enum | MemberKind.Class | MemberKind.Interface | MemberKind.Delegate | MemberKind.ArrayType)) != 0)
 163                                         return true;
 164
 165                                 switch (BuiltinType) {
 166                                 case BuiltinTypeSpec.Type.Int:
 167                                 case BuiltinTypeSpec.Type.UInt:
 168                                 case BuiltinTypeSpec.Type.Long:
 169                                 case BuiltinTypeSpec.Type.ULong:
 170                                 case BuiltinTypeSpec.Type.Float:
 171                                 case BuiltinTypeSpec.Type.Double:
 172                                 case BuiltinTypeSpec.Type.Char:
 173                                 case BuiltinTypeSpec.Type.Short:
 174                                 case BuiltinTypeSpec.Type.Decimal:
 175                                 case BuiltinTypeSpec.Type.Bool:
 176                                 case BuiltinTypeSpec.Type.SByte:
 177                                 case BuiltinTypeSpec.Type.Byte:
 178                                 case BuiltinTypeSpec.Type.UShort:
 179                                 case BuiltinTypeSpec.Type.Dynamic:
 180                                         return true;
 181                                 }
 182
 183                                 return false;
 184                         }
 185                 }
 186
 187                 public bool IsDelegate {
 188                         get {
 189                                 return Kind == MemberKind.Delegate;
 190                         }
 191                 }
 192
 193                 //
 194                 // Returns true for instances of Expression<T>
 195                 //
 196                 public virtual bool IsExpressionTreeType {
 197                         get {
 198                                 return false;
 199                         }
 200                         set {
 201                                 state = value ? state | StateFlags.InflatedExpressionType : state & ~StateFlags.InflatedExpressionType;
 202                         }
 203                 }
 204
 205                 public bool IsEnum {
 206                         get {
 207                                 return Kind == MemberKind.Enum;
 208                         }
 209                 }
 210
 211                 //
 212                 // Returns true for instances of IList<T>, IEnumerable<T>, ICollection<T>
 213                 //
 214                 public virtual bool IsArrayGenericInterface {
 215                         get {
 216                                 return false;
 217                         }
 218                         set {
 219                                 state = value ? state | StateFlags.GenericIterateInterface : state & ~StateFlags.GenericIterateInterface;
 220                         }
 221                 }
 222
 223                 //
 224                 // Returns true for instances of System.Threading.Tasks.Task<T>
 225                 //
 226                 public virtual bool IsGenericTask {
 227                         get {
 228                                 return false;
 229                         }
 230                         set {
 231                                 state = value ? state | StateFlags.GenericTask : state & ~StateFlags.GenericTask;
 232                         }
 233                 }
 234
 235                 // TODO: Should probably do
 236                 // IsGenericType -- recursive
 237                 // HasTypeParameter -- non-recursive
 238                 public bool IsGenericOrParentIsGeneric {
 239                         get {
 240                                 var ts = this;
 241                                 do {
 242                                         if (ts.IsGeneric)
 243                                                 return true;
 244                                         ts = ts.declaringType;
 245                                 } while (ts != null);
 246
 247                                 return false;
 248                         }
 249                 }
 250
 251                 public bool IsGenericParameter {
 252                         get {
 253                                 return Kind == MemberKind.TypeParameter;
 254                         }
 255                 }
 256
 257                 //
 258                 // Returns true for instances of Nullable<T>
 259                 //
 260                 public virtual bool IsNullableType {
 261                         get {
 262                                 return false;
 263                         }
 264                         set {
 265                                 state = value ? state | StateFlags.InflatedNullableType : state & ~StateFlags.InflatedNullableType;
 266                         }
 267                 }
 268
 269                 public bool IsNested {
 270                         get { return declaringType != null && Kind != MemberKind.TypeParameter; }
 271                 }
 272
 273                 public bool IsPointer {
 274                         get {
 275                                 return Kind == MemberKind.PointerType;
 276                         }
 277                 }
 278
 279                 public bool IsSealed {
 280                         get { return (Modifiers & Modifiers.SEALED) != 0; }
 281                 }
 282
 283                 public bool IsSpecialRuntimeType {
 284                         get {
 285                                 return (state & StateFlags.SpecialRuntimeType) != 0;
 286                         }
 287                         set {
 288                                 state = value ? state | StateFlags.SpecialRuntimeType : state & ~StateFlags.SpecialRuntimeType;
 289                         }
 290                 }
 291
 292                 public bool IsStruct {
 293                         get {
 294                                 return Kind == MemberKind.Struct;
 295                         }
 296                 }
 297
 298                 public bool IsStructOrEnum {
 299                         get {
 300                                 return (Kind & (MemberKind.Struct | MemberKind.Enum)) != 0;
 301                         }
 302                 }
 303
 304                 public bool IsTypeBuilder {
 305                         get {
 306 #if STATIC
 307                                 return true;
 308 #else
 309                                 var meta = GetMetaInfo().GetType ();
 310                                 return meta == TypeBuilder || meta == GenericTypeBuilder;
 311 #endif
 312                         }
 313                 }
 314
 315                 //
 316                 // Whether a type is unmanaged. This is used by the unsafe code
 317                 //
 318                 public bool IsUnmanaged {
 319                         get {
 320                                 if (IsPointer)
 321                                         return ((ElementTypeSpec) this).Element.IsUnmanaged;
 322
 323                                 var ds = MemberDefinition as TypeDefinition;
 324                                 if (ds != null)
 325                                         return ds.IsUnmanagedType ();
 326
 327                                 if (Kind == MemberKind.Void)
 328                                         return true;
 329
 330                                 if (Kind == MemberKind.TypeParameter)
 331                                         return false;
 332
 333                                 if (IsNested && DeclaringType.IsGenericOrParentIsGeneric)
 334                                         return false;
 335
 336                                 return IsValueType (this);
 337                         }
 338                 }
 339
 340                 //
 341                 // A cache of all type members (including nested types)
 342                 //
 343                 public MemberCache MemberCache {
 344                         get {
 345                                 if (cache == null || (state & StateFlags.PendingMemberCacheMembers) != 0)
 346                                         InitializeMemberCache (false);
 347
 348                                 return cache;
 349                         }
 350                         set {
 351                                 if (cache != null)
 352                                         throw new InternalErrorException ("Membercache reset");
 353
 354                                 cache = value;
 355                         }
 356                 }
 357
 358                 public MemberCache MemberCacheTypes {
 359                         get {
 360                                 if (cache == null)
 361                                         InitializeMemberCache (true);
 362
 363                                 return cache;
 364                         }
 365                 }
 366
 367                 public new ITypeDefinition MemberDefinition {
 368                         get {
 369                                 return (ITypeDefinition) definition;
 370                         }
 371                 }
 372
 373                 // TODO: Wouldn't be better to rely on cast to InflatedTypeSpec and
 374                 // remove the property, YES IT WOULD !!!
 375                 public virtual TypeSpec[] TypeArguments {
 376                         get { return TypeSpec.EmptyTypes; }
 377                 }
 378
 379                 #endregion
 380
 381                 public virtual bool AddInterface (TypeSpec iface)
 382                 {
 383                         if ((state & StateFlags.InterfacesExpanded) != 0)
 384                                 throw new InternalErrorException ("Modifying expanded interface list");
 385
 386                         if (ifaces == null) {
 387                                 ifaces = new List<TypeSpec> { iface };
 388                                 return true;
 389                         }
 390
 391                         if (!ifaces.Contains (iface)) {
 392                                 ifaces.Add (iface);
 393                                 return true;
 394                         }
 395
 396                         return false;
 397                 }
 398
 399                 //
 400                 // Special version used during type definition
 401                 //
 402                 public bool AddInterfaceDefined (TypeSpec iface)
 403                 {
 404                         if (!AddInterface (iface))
 405                                 return false;
 406
 407                         //
 408                         // We can get into a situation where a type is inflated before
 409                         // its interfaces are resoved. Consider this situation
 410                         //
 411                         // class A<T> : X<A<int>>, IFoo {}
 412                         //
 413                         // When resolving base class of X`1 we inflate context type A`1
 414                         // All this happens before we even hit IFoo resolve. Without
 415                         // additional expansion any inside usage of A<T> would miss IFoo
 416                         // interface because it comes from early inflated A`1 definition.
 417                         //
 418                         if (inflated_instances != null) {
 419                                 //
 420                                 // Inflate only existing instances not any new instances added
 421                                 // during AddInterface
 422                                 //
 423                                 var inflated_existing = inflated_instances.Values.ToArray ();
 424                                 foreach (var inflated in inflated_existing) {
 425                                         inflated.AddInterface (iface);
 426                                 }
 427                         }
 428
 429                         return true;
 430                 }
 431
 432                 //
 433                 // Returns all type arguments, usefull for nested types
 434                 //
 435                 public static TypeSpec[] GetAllTypeArguments (TypeSpec type)
 436                 {
 437                         IList<TypeSpec> targs = TypeSpec.EmptyTypes;
 438
 439                         do {
 440                                 if (type.Arity > 0) {
 441                                         if (targs.Count == 0) {
 442                                                 targs = type.TypeArguments;
 443                                         } else {
 444                                                 var list = targs as List<TypeSpec> ?? new List<TypeSpec> (targs);
 445                                                 list.AddRange (type.TypeArguments);
 446                                                 targs = list;
 447                                         }
 448                                 }
 449
 450                                 type = type.declaringType;
 451                         } while (type != null);
 452
 453                         return targs as TypeSpec[] ?? ((List<TypeSpec>) targs).ToArray ();
 454                 }
 455
 456                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
 457                 {
 458                         if (Kind != MemberKind.Class)
 459                                 throw new InternalErrorException ();
 460
 461                         if (!pa.IsDefined)
 462                                 return Attribute.DefaultUsageAttribute;
 463
 464                         AttributeUsageAttribute aua = null;
 465                         var type = this;
 466                         while (type != null) {
 467                                 aua = type.MemberDefinition.GetAttributeUsage (pa);
 468                                 if (aua != null)
 469                                         break;
 470
 471                                 type = type.BaseType;
 472                         }
 473
 474                         return aua;
 475                 }
 476
 477                 //
 478                 // Return metadata information used during emit to describe the type
 479                 //
 480                 public virtual MetaType GetMetaInfo ()
 481                 {
 482                         return info;
 483                 }
 484
 485                 public virtual TypeSpec GetDefinition ()
 486                 {
 487                         return this;
 488                 }
 489
 490                 //
 491                 // Text representation of type used by documentation writer
 492                 //
 493                 public override string GetSignatureForDocumentation ()
 494                 {
 495                         StringBuilder sb = new StringBuilder ();
 496                         if (IsNested) {
 497                                 sb.Append (DeclaringType.GetSignatureForDocumentation ());
 498                         } else {
 499                                 sb.Append (MemberDefinition.Namespace);
 500                         }
 501
 502                         if (sb.Length != 0)
 503                                 sb.Append (".");
 504
 505                         sb.Append (Name);
 506                         if (Arity > 0) {
 507                                 if (this is InflatedTypeSpec) {
 508                                     sb.Append ("{");
 509                                     for (int i = 0; i < Arity; ++i) {
 510                                         if (i > 0)
 511                                             sb.Append (",");
 512
 513                                         sb.Append (TypeArguments[i].GetSignatureForDocumentation ());
 514                                     }
 515                                     sb.Append ("}");
 516                                 } else {
 517                                         sb.Append ("`");
 518                                         sb.Append (Arity.ToString ());
 519                                 }
 520                         }
 521
 522                         return sb.ToString ();
 523                 }
 524
 525                 public string GetExplicitNameSignatureForDocumentation ()
 526                 {
 527                         StringBuilder sb = new StringBuilder ();
 528                         if (IsNested) {
 529                                 sb.Append (DeclaringType.GetExplicitNameSignatureForDocumentation ());
 530                         } else if (MemberDefinition.Namespace != null) {
 531                                 sb.Append (MemberDefinition.Namespace.Replace ('.', '#'));
 532                         }
 533
 534                         if (sb.Length != 0)
 535                                 sb.Append ("#");
 536
 537                         sb.Append (Name);
 538                         if (Arity > 0) {
 539                                 sb.Append ("{");
 540                                 for (int i = 0; i < Arity; ++i) {
 541                                         if (i > 0)
 542                                                 sb.Append (",");
 543
 544                                         sb.Append (TypeArguments[i].GetExplicitNameSignatureForDocumentation ());
 545                                 }
 546                                 sb.Append ("}");
 547                         }
 548
 549                         return sb.ToString ();
 550                 }
 551
 552                 public override string GetSignatureForError ()
 553                 {
 554                         string s;
 555
 556                         if (IsNested) {
 557                                 s = DeclaringType.GetSignatureForError ();
 558                         } else if (MemberDefinition is AnonymousTypeClass) {
 559                                 return ((AnonymousTypeClass) MemberDefinition).GetSignatureForError ();
 560                         } else {
 561                                 s = MemberDefinition.Namespace;
 562                         }
 563
 564                         if (!string.IsNullOrEmpty (s))
 565                                 s += ".";
 566
 567                         return s + Name + GetTypeNameSignature ();
 568                 }
 569
 570                 public string GetSignatureForErrorIncludingAssemblyName ()
 571                 {
 572                         return string.Format ("{0} [{1}]", GetSignatureForError (), MemberDefinition.DeclaringAssembly.FullName);
 573                 }
 574
 575                 protected virtual string GetTypeNameSignature ()
 576                 {
 577                         if (!IsGeneric)
 578                                 return null;
 579
 580                         return "<" + TypeManager.CSharpName (MemberDefinition.TypeParameters) + ">";
 581                 }
 582
 583                 public bool ImplementsInterface (TypeSpec iface, bool variantly)
 584                 {
 585                         var ifaces = Interfaces;
 586                         if (ifaces != null) {
 587                                 for (int i = 0; i < ifaces.Count; ++i) {
 588                                         if (TypeSpecComparer.IsEqual (ifaces[i], iface))
 589                                                 return true;
 590
 591                                         if (variantly && TypeSpecComparer.Variant.IsEqual (ifaces[i], iface))
 592                                                 return true;
 593                                 }
 594                         }
 595
 596                         return false;
 597                 }
 598
 599                 protected virtual void InitializeMemberCache (bool onlyTypes)
 600                 {
 601                         try {
 602                                 MemberDefinition.LoadMembers (this, onlyTypes, ref cache);
 603                         } catch (Exception e) {
 604                                 throw new InternalErrorException (e, "Unexpected error when loading type `{0}'", GetSignatureForError ());
 605                         }
 606
 607                         if (onlyTypes)
 608                                 state |= StateFlags.PendingMemberCacheMembers;
 609                         else
 610                                 state &= ~StateFlags.PendingMemberCacheMembers;
 611                 }
 612
 613                 //
 614                 // Is @baseClass base implementation of @type. With enabled @dynamicIsEqual the slower
 615                 // comparison is used to hide differences between `object' and `dynamic' for generic
 616                 // types. Should not be used for comparisons where G<object> != G<dynamic>
 617                 //
 618                 public static bool IsBaseClass (TypeSpec type, TypeSpec baseClass, bool dynamicIsObject)
 619                 {
 620                         if (dynamicIsObject && baseClass.IsGeneric) {
 621                                 //
 622                                 // Returns true for a hierarchies like this when passing baseClass of A<dynamic>
 623                                 //
 624                                 // class B : A<object> {}
 625                                 //
 626                                 type = type.BaseType;
 627                                 while (type != null) {
 628                                         if (TypeSpecComparer.IsEqual (type, baseClass))
 629                                                 return true;
 630
 631                                         type = type.BaseType;
 632                                 }
 633
 634                                 return false;
 635                         }
 636
 637                         while (type != null) {
 638                                 type = type.BaseType;
 639                                 if (type == baseClass)
 640                                         return true;
 641                         }
 642
 643                         return false;
 644                 }
 645
 646                 public static bool IsReferenceType (TypeSpec t)
 647                 {
 648                         switch (t.Kind) {
 649                         case MemberKind.TypeParameter:
 650                                 return ((TypeParameterSpec) t).IsReferenceType;
 651                         case MemberKind.Struct:
 652                         case MemberKind.Enum:
 653                         case MemberKind.Void:
 654                                 return false;
 655                         case MemberKind.InternalCompilerType:
 656                                 //
 657                                 // Null is considered to be a reference type
 658                                 //
 659                                 return t == InternalType.NullLiteral || t.BuiltinType == BuiltinTypeSpec.Type.Dynamic;
 660                         default:
 661                                 return true;
 662                         }
 663                 }
 664
 665                 public static bool IsNonNullableValueType (TypeSpec t)
 666                 {
 667                         switch (t.Kind) {
 668                         case MemberKind.TypeParameter:
 669                                 return ((TypeParameterSpec) t).IsValueType;
 670                         case MemberKind.Struct:
 671                                 return !t.IsNullableType;
 672                         case MemberKind.Enum:
 673                                 return true;
 674                         default:
 675                                 return false;
 676                         }
 677                 }
 678
 679                 public static bool IsValueType (TypeSpec t)
 680                 {
 681                         switch (t.Kind) {
 682                         case MemberKind.TypeParameter:
 683                                 return ((TypeParameterSpec) t).IsValueType;
 684                         case MemberKind.Struct:
 685                         case MemberKind.Enum:
 686                                 return true;
 687                         default:
 688                                 return false;
 689                         }
 690                 }
 691
 692                 public override MemberSpec InflateMember (TypeParameterInflator inflator)
 693                 {
 694                         var targs = IsGeneric ? MemberDefinition.TypeParameters : TypeSpec.EmptyTypes;
 695
 696                         //
 697                         // When inflating nested type from inside the type instance will be same
 698                         // because type parameters are same for all nested types
 699                         //
 700                         if (DeclaringType == inflator.TypeInstance) {
 701                                 return MakeGenericType (inflator.Context, targs);
 702                         }
 703
 704                         return new InflatedTypeSpec (inflator.Context, this, inflator.TypeInstance, targs);
 705                 }
 706
 707                 //
 708                 // Inflates current type using specific type arguments
 709                 //
 710                 public InflatedTypeSpec MakeGenericType (IModuleContext context, TypeSpec[] targs)
 711                 {
 712                         if (targs.Length == 0 && !IsNested)
 713                                 throw new ArgumentException ("Empty type arguments for type " + GetSignatureForError ());
 714
 715                         InflatedTypeSpec instance;
 716
 717                         if (inflated_instances == null) {
 718                                 inflated_instances = new Dictionary<TypeSpec[], InflatedTypeSpec> (TypeSpecComparer.Default);
 719
 720                                 if (IsNested) {
 721                                         instance = this as InflatedTypeSpec;
 722                                         if (instance != null) {
 723                                                 //
 724                                                 // Nested types could be inflated on already inflated instances
 725                                                 // Caching this type ensured we are using same instance for
 726                                                 // inside/outside inflation using local type parameters
 727                                                 //
 728                                                 inflated_instances.Add (TypeArguments, instance);
 729                                         }
 730                                 }
 731                         }
 732
 733                         if (!inflated_instances.TryGetValue (targs, out instance)) {
 734                                 if (GetDefinition () != this && !IsNested)
 735                                         throw new InternalErrorException ("`{0}' must be type definition or nested non-inflated type to MakeGenericType",
 736                                                 GetSignatureForError ());
 737
 738                                 instance = new InflatedTypeSpec (context, this, declaringType, targs);
 739                                 inflated_instances.Add (targs, instance);
 740                         }
 741
 742                         return instance;
 743                 }
 744
 745                 public virtual TypeSpec Mutate (TypeParameterMutator mutator)
 746                 {
 747                         return this;
 748                 }
 749
 750                 public override List<MissingTypeSpecReference> ResolveMissingDependencies (MemberSpec caller)
 751                 {
 752                         List<MissingTypeSpecReference> missing = null;
 753
 754                         if (Kind == MemberKind.MissingType) {
 755                                 missing = new List<MissingTypeSpecReference> ();
 756                                 missing.Add (new MissingTypeSpecReference (this, caller));
 757                                 return missing;
 758                         }
 759
 760                         foreach (var targ in TypeArguments) {
 761                                 if (targ.Kind == MemberKind.MissingType) {
 762                                         if (missing == null)
 763                                                 missing = new List<MissingTypeSpecReference> ();
 764
 765                                         missing.Add (new MissingTypeSpecReference (targ, caller));
 766                                 }
 767                         }
 768
 769                         if (Interfaces != null) {
 770                                 foreach (var iface in Interfaces) {
 771                                         if (iface.Kind == MemberKind.MissingType) {
 772                                                 if (missing == null)
 773                                                         missing = new List<MissingTypeSpecReference> ();
 774
 775                                                 missing.Add (new MissingTypeSpecReference (iface, caller));
 776                                         }
 777                                 }
 778                         }
 779
 780                         if (MemberDefinition.TypeParametersCount > 0) {
 781                                 foreach (var tp in MemberDefinition.TypeParameters) {
 782                                         var tp_missing = tp.GetMissingDependencies (this);
 783                                         if (tp_missing != null) {
 784                                                 if (missing == null)
 785                                                         missing = new List<MissingTypeSpecReference> ();
 786
 787                                                 missing.AddRange (tp_missing);
 788                                         }
 789                                 }
 790                         }
 791
 792                         if (missing != null || BaseType == null)
 793                                 return missing;
 794
 795                         return BaseType.ResolveMissingDependencies (this);
 796                 }
 797
 798                 public void SetMetaInfo (MetaType info)
 799                 {
 800                         if (this.info != null)
 801                                 throw new InternalErrorException ("MetaInfo reset");
 802
 803                         this.info = info;
 804                 }
 805
 806                 public void SetExtensionMethodContainer ()
 807                 {
 808                         modifiers |= Modifiers.METHOD_EXTENSION;
 809                 }
 810
 811                 public void UpdateInflatedInstancesBaseType ()
 812                 {
 813                         //
 814                         // When nested class has a partial part the situation where parent type
 815                         // is inflated before its base type is defined can occur. In such case
 816                         // all inflated (should be only 1) instansted need to be updated
 817                         //
 818                         // partial class A<T> {
 819                         //   partial class B : A<int> { }
 820                         // }
 821                         //
 822                         // partial class A<T> : X {}
 823                         //
 824                         if (inflated_instances == null)
 825                                 return;
 826
 827                         foreach (var inflated in inflated_instances) {
 828                                 //
 829                                 // Don't need to inflate possible generic type because for now the method
 830                                 // is always used from within the nested type
 831                                 //
 832                                 inflated.Value.BaseType = base_type;
 833                         }
 834                 }
 835         }
 836
 837         //
 838         // Special version used for types which must exist in corlib or
 839         // the compiler cannot work
 840         //
 841         public sealed class BuiltinTypeSpec : TypeSpec
 842         {
 843                 public enum Type
 844                 {
 845                         None = 0,
 846
 847                         // Ordered carefully for fast compares
 848                         FirstPrimitive = 1,
 849                         Bool = 1,
 850                         Byte = 2,
 851                         SByte = 3,
 852                         Char = 4,
 853                         Short = 5,
 854                         UShort = 6,
 855                         Int = 7,
 856                         UInt = 8,
 857                         Long = 9,
 858                         ULong = 10,
 859                         Float = 11,
 860                         Double = 12,
 861                         LastPrimitive = 12,
 862                         Decimal = 13,
 863
 864                         IntPtr = 14,
 865                         UIntPtr = 15,
 866
 867                         Object = 16,
 868                         Dynamic = 17,
 869                         String = 18,
 870                         Type = 19,
 871
 872                         ValueType = 20,
 873                         Enum = 21,
 874                         Delegate = 22,
 875                         MulticastDelegate = 23,
 876                         Array = 24,
 877
 878                         IEnumerator,
 879                         IEnumerable,
 880                         IDisposable,
 881                         Exception,
 882                         Attribute,
 883                         Other,
 884                 }
 885
 886                 readonly Type type;
 887                 readonly string ns;
 888                 readonly string name;
 889
 890                 public BuiltinTypeSpec (MemberKind kind, string ns, string name, Type builtinKind)
 891                         : base (kind, null, null, null, Modifiers.PUBLIC)
 892                 {
 893                         this.type = builtinKind;
 894                         this.ns = ns;
 895                         this.name = name;
 896                 }
 897
 898                 public BuiltinTypeSpec (string name, Type builtinKind)
 899                         : this (MemberKind.InternalCompilerType, "", name, builtinKind)
 900                 {
 901                         // Make all internal types CLS-compliant, non-obsolete, compact
 902                         state = (state & ~(StateFlags.CLSCompliant_Undetected | StateFlags.Obsolete_Undetected | StateFlags.MissingDependency_Undetected)) | StateFlags.CLSCompliant;
 903                 }
 904
 905                 #region Properties
 906
 907                 public override int Arity {
 908                         get {
 909                                 return 0;
 910                         }
 911                 }
 912
 913                 public override BuiltinTypeSpec.Type BuiltinType {
 914                         get {
 915                                 return type;
 916                         }
 917                 }
 918
 919                 public string FullName {
 920                         get {
 921                                 return ns + '.' + name;
 922                         }
 923                 }
 924
 925                 public override string Name {
 926                         get {
 927                                 return name;
 928                         }
 929                 }
 930
 931                 public string Namespace {
 932                         get {
 933                                 return ns;
 934                         }
 935                 }
 936
 937                 #endregion
 938
 939                 public static bool IsPrimitiveType (TypeSpec type)
 940                 {
 941                         return type.BuiltinType >= Type.FirstPrimitive && type.BuiltinType <= Type.LastPrimitive;
 942                 }
 943
 944                 public static bool IsPrimitiveTypeOrDecimal (TypeSpec type)
 945                 {
 946                         return type.BuiltinType >= Type.FirstPrimitive && type.BuiltinType <= Type.Decimal;
 947                 }
 948
 949                 public override string GetSignatureForError ()
 950                 {
 951                         switch (Name) {
 952                         case "Int32": return "int";
 953                         case "Int64": return "long";
 954                         case "String": return "string";
 955                         case "Boolean": return "bool";
 956                         case "Void": return "void";
 957                         case "Object": return "object";
 958                         case "UInt32": return "uint";
 959                         case "Int16": return "short";
 960                         case "UInt16": return "ushort";
 961                         case "UInt64": return "ulong";
 962                         case "Single": return "float";
 963                         case "Double": return "double";
 964                         case "Decimal": return "decimal";
 965                         case "Char": return "char";
 966                         case "Byte": return "byte";
 967                         case "SByte": return "sbyte";
 968                         }
 969
 970                         if (ns.Length == 0)
 971                                 return name;
 972
 973                         return FullName;
 974                 }
 975
 976                 //
 977                 // Returns the size of type if known, otherwise, 0
 978                 //
 979                 public static int GetSize (TypeSpec type)
 980                 {
 981                         switch (type.BuiltinType) {
 982                         case Type.Int:
 983                         case Type.UInt:
 984                         case Type.Float:
 985                                 return 4;
 986                         case Type.Long:
 987                         case Type.ULong:
 988                         case Type.Double:
 989                                 return 8;
 990                         case Type.Byte:
 991                         case Type.SByte:
 992                         case Type.Bool:
 993                                 return 1;
 994                         case Type.Short:
 995                         case Type.Char:
 996                         case Type.UShort:
 997                                 return 2;
 998                         case Type.Decimal:
 999                                 return 16;
1000                         default:
1001                                 return 0;
1002                         }
1003                 }
1004
1005                 public void SetDefinition (ITypeDefinition td, MetaType type, Modifiers mod)
1006                 {
1007                         this.definition = td;
1008                         this.info = type;
1009                         this.modifiers |= (mod & ~Modifiers.AccessibilityMask);
1010                 }
1011
1012                 public void SetDefinition (TypeSpec ts)
1013                 {
1014                         this.definition = ts.MemberDefinition;
1015                         this.info = ts.GetMetaInfo ();
1016                         this.BaseType = ts.BaseType;
1017                         this.Interfaces = ts.Interfaces;
1018                         this.modifiers = ts.Modifiers;
1019                 }
1020         }
1021
1022         //
1023         // Various type comparers used by compiler
1024         //
1025         static class TypeSpecComparer
1026         {
1027                 //
1028                 // Does strict reference comparion only
1029                 //
1030                 public static readonly DefaultImpl Default = new DefaultImpl ();
1031
1032                 public class DefaultImpl : IEqualityComparer<TypeSpec[]>
1033                 {
1034                         #region IEqualityComparer<TypeSpec[]> Members
1035
1036                         bool IEqualityComparer<TypeSpec[]>.Equals (TypeSpec[] x, TypeSpec[] y)
1037                         {
1038                                 if (x == y)
1039                                         return true;
1040
1041                                 if (x.Length != y.Length)
1042                                         return false;
1043
1044                                 for (int i = 0; i < x.Length; ++i)
1045                                         if (x[i] != y[i])
1046                                                 return false;
1047
1048                                 return true;
1049                         }
1050
1051                         int IEqualityComparer<TypeSpec[]>.GetHashCode (TypeSpec[] obj)
1052                         {
1053                                 int hash = 0;
1054                                 for (int i = 0; i < obj.Length; ++i)
1055                                         hash = (hash << 5) - hash + obj[i].GetHashCode ();
1056
1057                                 return hash;
1058                         }
1059
1060                         #endregion
1061                 }
1062
1063                 //
1064                 // When comparing type signature of overrides or overloads
1065                 // this version tolerates different MVARs at same position
1066                 //
1067                 public static class Override
1068                 {
1069                         public static bool IsEqual (TypeSpec a, TypeSpec b)
1070                         {
1071                                 if (a == b)
1072                                         return true;
1073
1074                                 //
1075                                 // Consider the following example:
1076                                 //
1077                                 //     public abstract class A
1078                                 //     {
1079                                 //        public abstract T Foo<T>();
1080                                 //     }
1081                                 //
1082                                 //     public class B : A
1083                                 //     {
1084                                 //        public override U Foo<T>() { return default (U); }
1085                                 //     }
1086                                 //
1087                                 // Here, `T' and `U' are method type parameters from different methods
1088                                 // (A.Foo and B.Foo), so both `==' and Equals() will fail.
1089                                 //
1090                                 // However, since we're determining whether B.Foo() overrides A.Foo(),
1091                                 // we need to do a signature based comparision and consider them equal.
1092                                 //
1093
1094                                 var tp_a = a as TypeParameterSpec;
1095                                 if (tp_a != null) {
1096                                         var tp_b = b as TypeParameterSpec;
1097                                         return tp_b != null && tp_a.IsMethodOwned == tp_b.IsMethodOwned && tp_a.DeclaredPosition == tp_b.DeclaredPosition;
1098                                 }
1099
1100                                 var ac_a = a as ArrayContainer;
1101                                 if (ac_a != null) {
1102                                         var ac_b = b as ArrayContainer;
1103                                         return ac_b != null && ac_a.Rank == ac_b.Rank && IsEqual (ac_a.Element, ac_b.Element);
1104                                 }
1105
1106                                 if (a.BuiltinType == BuiltinTypeSpec.Type.Dynamic || b.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
1107                                         return b.BuiltinType == BuiltinTypeSpec.Type.Object || a.BuiltinType == BuiltinTypeSpec.Type.Object;
1108
1109                                 if (a.MemberDefinition != b.MemberDefinition)
1110                                         return false;
1111
1112                                 do {
1113                                         for (int i = 0; i < a.TypeArguments.Length; ++i) {
1114                                                 if (!IsEqual (a.TypeArguments[i], b.TypeArguments[i]))
1115                                                         return false;
1116                                         }
1117
1118                                         a = a.DeclaringType;
1119                                         b = b.DeclaringType;
1120                                 } while (a != null);
1121
1122                                 return true;
1123                         }
1124
1125                         public static bool IsEqual (TypeSpec[] a, TypeSpec[] b)
1126                         {
1127                                 if (a == b)
1128                                         return true;
1129
1130                                 if (a.Length != b.Length)
1131                                         return false;
1132
1133                                 for (int i = 0; i < a.Length; ++i) {
1134                                         if (!IsEqual (a[i], b[i]))
1135                                                 return false;
1136                                 }
1137
1138                                 return true;
1139                         }
1140
1141
1142                         //
1143                         // Compares unordered arrays
1144                         //
1145                         public static bool IsSame (TypeSpec[] a, TypeSpec[] b)
1146                         {
1147                                 if (a == b)
1148                                         return true;
1149
1150                                 if (a == null || b == null || a.Length != b.Length)
1151                                         return false;
1152
1153                                 for (int ai = 0; ai < a.Length; ++ai) {
1154                                         bool found = false;
1155                                         for (int bi = 0; bi < b.Length; ++bi) {
1156                                                 if (IsEqual (a[ai], b[bi])) {
1157                                                         found = true;
1158                                                         break;
1159                                                 }
1160                                         }
1161
1162                                         if (!found)
1163                                                 return false;
1164                                 }
1165
1166                                 return true;
1167                         }
1168
1169                         public static bool IsEqual (AParametersCollection a, AParametersCollection b)
1170                         {
1171                                 if (a == b)
1172                                         return true;
1173
1174                                 if (a.Count != b.Count)
1175                                         return false;
1176
1177                                 for (int i = 0; i < a.Count; ++i) {
1178                                         if (!IsEqual (a.Types[i], b.Types[i]))
1179                                                 return false;
1180
1181                                         if ((a.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask) != (b.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask))
1182                                                 return false;
1183                                 }
1184
1185                                 return true;
1186                         }
1187                 }
1188
1189                 //
1190                 // Type variance equality comparison
1191                 //
1192                 public static class Variant
1193                 {
1194                         public static bool IsEqual (TypeSpec type1, TypeSpec type2)
1195                         {
1196                                 if (!type1.IsGeneric || !type2.IsGeneric)
1197                                         return false;
1198
1199                                 var target_type_def = type2.MemberDefinition;
1200                                 if (type1.MemberDefinition != target_type_def)
1201                                         return false;
1202
1203                                 var t1_targs = type1.TypeArguments;
1204                                 var t2_targs = type2.TypeArguments;
1205                                 var targs_definition = target_type_def.TypeParameters;
1206
1207                                 if (!type1.IsInterface && !type1.IsDelegate) {
1208                                         return false;
1209                                 }
1210
1211                                 for (int i = 0; i < targs_definition.Length; ++i) {
1212                                         if (TypeSpecComparer.IsEqual (t1_targs[i], t2_targs[i]))
1213                                                 continue;
1214
1215                                         Variance v = targs_definition[i].Variance;
1216                                         if (v == Variance.None) {
1217                                                 return false;
1218                                         }
1219
1220                                         if (v == Variance.Covariant) {
1221                                                 if (!Convert.ImplicitReferenceConversionExists (t1_targs[i], t2_targs[i]))
1222                                                         return false;
1223                                         } else if (!Convert.ImplicitReferenceConversionExists (t2_targs[i], t1_targs[i])) {
1224                                                 return false;
1225                                         }
1226                                 }
1227
1228                                 return true;
1229                         }
1230                 }
1231
1232                 //
1233                 // Checks whether two generic instances may become equal for some
1234                 // particular instantiation (26.3.1).
1235                 //
1236                 public static class Unify
1237                 {
1238                         //
1239                         // Either @a or @b must be generic type
1240                         //
1241                         public static bool IsEqual (TypeSpec a, TypeSpec b)
1242                         {
1243                                 if (a.MemberDefinition != b.MemberDefinition) {
1244                                         var base_ifaces = a.Interfaces;
1245                                         if (base_ifaces != null) {
1246                                                 foreach (var base_iface in base_ifaces) {
1247                                                         if (base_iface.Arity > 0 && IsEqual (base_iface, b))
1248                                                                 return true;
1249                                                 }
1250                                         }
1251
1252                                         return false;
1253                                 }
1254
1255                                 var ta = a.TypeArguments;
1256                                 var tb = b.TypeArguments;
1257                                 for (int i = 0; i < ta.Length; i++) {
1258                                         if (!MayBecomeEqualGenericTypes (ta[i], tb[i]))
1259                                                 return false;
1260                                 }
1261
1262                                 if (a.IsNested && b.IsNested)
1263                                         return IsEqual (a.DeclaringType, b.DeclaringType);
1264
1265                                 return true;
1266                         }
1267
1268                         static bool ContainsTypeParameter (TypeSpec tparam, TypeSpec type)
1269                         {
1270                                 TypeSpec[] targs = type.TypeArguments;
1271                                 for (int i = 0; i < targs.Length; i++) {
1272                                         if (tparam == targs[i])
1273                                                 return true;
1274
1275                                         if (ContainsTypeParameter (tparam, targs[i]))
1276                                                 return true;
1277                                 }
1278
1279                                 return false;
1280                         }
1281
1282                         /// <summary>
1283                         ///   Check whether `a' and `b' may become equal generic types.
1284                         ///   The algorithm to do that is a little bit complicated.
1285                         /// </summary>
1286                         static bool MayBecomeEqualGenericTypes (TypeSpec a, TypeSpec b)
1287                         {
1288                                 if (a.IsGenericParameter) {
1289                                         //
1290                                         // If a is an array of a's type, they may never
1291                                         // become equal.
1292                                         //
1293                                         if (b.IsArray)
1294                                                 return false;
1295
1296                                         //
1297                                         // If b is a generic parameter or an actual type,
1298                                         // they may become equal:
1299                                         //
1300                                         //    class X<T,U> : I<T>, I<U>
1301                                         //    class X<T> : I<T>, I<float>
1302                                         //
1303                                         if (b.IsGenericParameter)
1304                                                 return a != b && a.DeclaringType == b.DeclaringType;
1305
1306                                         //
1307                                         // We're now comparing a type parameter with a
1308                                         // generic instance.  They may become equal unless
1309                                         // the type parameter appears anywhere in the
1310                                         // generic instance:
1311                                         //
1312                                         //    class X<T,U> : I<T>, I<X<U>>
1313                                         //        -> error because you could instanciate it as
1314                                         //           X<X<int>,int>
1315                                         //
1316                                         //    class X<T> : I<T>, I<X<T>> -> ok
1317                                         //
1318
1319                                         return !ContainsTypeParameter (a, b);
1320                                 }
1321
1322                                 if (b.IsGenericParameter)
1323                                         return MayBecomeEqualGenericTypes (b, a);
1324
1325                                 //
1326                                 // At this point, neither a nor b are a type parameter.
1327                                 //
1328                                 // If one of them is a generic instance, compare them (if the
1329                                 // other one is not a generic instance, they can never
1330                                 // become equal).
1331                                 //
1332                                 if (TypeManager.IsGenericType (a) || TypeManager.IsGenericType (b))
1333                                         return IsEqual (a, b);
1334
1335                                 //
1336                                 // If both of them are arrays.
1337                                 //
1338                                 var a_ac = a as ArrayContainer;
1339                                 if (a_ac != null) {
1340                                         var b_ac = b as ArrayContainer;
1341                                         if (b_ac == null || a_ac.Rank != b_ac.Rank)
1342                                                 return false;
1343
1344                                         return MayBecomeEqualGenericTypes (a_ac.Element, b_ac.Element);
1345                                 }
1346
1347                                 //
1348                                 // Ok, two ordinary types.
1349                                 //
1350                                 return false;
1351                         }
1352                 }
1353
1354                 public static bool Equals (TypeSpec[] x, TypeSpec[] y)
1355                 {
1356                         if (x == y)
1357                                 return true;
1358
1359                         if (x.Length != y.Length)
1360                                 return false;
1361
1362                         for (int i = 0; i < x.Length; ++i)
1363                                 if (!IsEqual (x[i], y[i]))
1364                                         return false;
1365
1366                         return true;
1367                 }
1368
1369                 //
1370                 // Identity type conversion
1371                 //
1372                 // Default reference comparison, it has to be used when comparing
1373                 // two possible dynamic/internal types
1374                 //
1375                 public static bool IsEqual (TypeSpec a, TypeSpec b)
1376                 {
1377                         if (a == b) {
1378                                 // This also rejects dynamic == dynamic
1379                                 return a.Kind != MemberKind.InternalCompilerType || a.BuiltinType == BuiltinTypeSpec.Type.Dynamic;
1380                         }
1381
1382                         if (a == null || b == null)
1383                                 return false;
1384
1385                         if (a.IsArray) {
1386                                 var a_a = (ArrayContainer) a;
1387                                 var b_a = b as ArrayContainer;
1388                                 if (b_a == null)
1389                                         return false;
1390
1391                                 return a_a.Rank == b_a.Rank && IsEqual (a_a.Element, b_a.Element);
1392                         }
1393
1394                         if (!a.IsGeneric || !b.IsGeneric) {
1395                                 //
1396                                 // object and dynamic are considered equivalent there is an identity conversion
1397                                 // between object and dynamic, and between constructed types that are the same
1398                                 // when replacing all occurences of dynamic with object.
1399                                 //
1400                                 if (a.BuiltinType == BuiltinTypeSpec.Type.Dynamic || b.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
1401                                         return b.BuiltinType == BuiltinTypeSpec.Type.Object || a.BuiltinType == BuiltinTypeSpec.Type.Object;
1402
1403                                 return false;
1404                         }
1405
1406                         if (a.MemberDefinition != b.MemberDefinition)
1407                                 return false;
1408
1409                         do {
1410                                 if (!Equals (a.TypeArguments, b.TypeArguments))
1411                                         return false;
1412
1413                                 a = a.DeclaringType;
1414                                 b = b.DeclaringType;
1415                         } while (a != null);
1416
1417                         return true;
1418                 }
1419         }
1420
1421         public interface ITypeDefinition : IMemberDefinition
1422         {
1423                 IAssemblyDefinition DeclaringAssembly { get; }
1424                 string Namespace { get; }
1425                 bool IsPartial { get; }
1426                 bool IsComImport { get; }
1427                 bool IsTypeForwarder { get; }
1428                 bool IsCyclicTypeForwarder { get; }
1429                 int TypeParametersCount { get; }
1430                 TypeParameterSpec[] TypeParameters { get; }
1431
1432                 TypeSpec GetAttributeCoClass ();
1433                 string GetAttributeDefaultMember ();
1434                 AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa);
1435                 bool IsInternalAsPublic (IAssemblyDefinition assembly);
1436                 void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache);
1437         }
1438
1439         class InternalType : TypeSpec, ITypeDefinition
1440         {
1441                 public static readonly InternalType AnonymousMethod = new InternalType ("anonymous method");
1442                 public static readonly InternalType Arglist = new InternalType ("__arglist");
1443                 public static readonly InternalType MethodGroup = new InternalType ("method group");
1444                 public static readonly InternalType NullLiteral = new InternalType ("null");
1445                 public static readonly InternalType FakeInternalType = new InternalType ("<fake$type>");
1446                 public static readonly InternalType Namespace = new InternalType ("<namespace>");
1447                 public static readonly InternalType ErrorType = new InternalType ("<error>");
1448
1449                 readonly string name;
1450
1451                 InternalType (string name)
1452                         : base (MemberKind.InternalCompilerType, null, null, null, Modifiers.PUBLIC)
1453                 {
1454                         this.name = name;
1455                         this.definition = this;
1456                         cache = MemberCache.Empty;
1457
1458                         // Make all internal types CLS-compliant, non-obsolete
1459                         state = (state & ~(StateFlags.CLSCompliant_Undetected | StateFlags.Obsolete_Undetected | StateFlags.MissingDependency_Undetected)) | StateFlags.CLSCompliant;
1460                 }
1461
1462                 #region Properties
1463
1464                 public override int Arity {
1465                         get {
1466                                 return 0;
1467                         }
1468                 }
1469
1470                 IAssemblyDefinition ITypeDefinition.DeclaringAssembly {
1471                         get {
1472                                 throw new NotImplementedException ();
1473                         }
1474                 }
1475
1476                 bool ITypeDefinition.IsComImport {
1477                         get {
1478                                 return false;
1479                         }
1480                 }
1481
1482                 bool IMemberDefinition.IsImported {
1483                         get {
1484                                 return false;
1485                         }
1486                 }
1487
1488                 bool ITypeDefinition.IsPartial {
1489                         get {
1490                                 return false;
1491                         }
1492                 }
1493
1494                 bool ITypeDefinition.IsTypeForwarder {
1495                         get {
1496                                 return false;
1497                         }
1498                 }
1499
1500                 bool ITypeDefinition.IsCyclicTypeForwarder {
1501                         get {
1502                                 return false;
1503                         }
1504                 }
1505
1506                 public override string Name {
1507                         get {
1508                                 return name;
1509                         }
1510                 }
1511
1512                 string ITypeDefinition.Namespace {
1513                         get {
1514                                 return null;
1515                         }
1516                 }
1517
1518                 int ITypeDefinition.TypeParametersCount {
1519                         get {
1520                                 return 0;
1521                         }
1522                 }
1523
1524                 TypeParameterSpec[] ITypeDefinition.TypeParameters {
1525                         get {
1526                                 return null;
1527                         }
1528                 }
1529
1530                 #endregion
1531
1532                 public override string GetSignatureForError ()
1533                 {
1534                         return name;
1535                 }
1536
1537                 #region ITypeDefinition Members
1538
1539                 TypeSpec ITypeDefinition.GetAttributeCoClass ()
1540                 {
1541                         return null;
1542                 }
1543
1544                 string ITypeDefinition.GetAttributeDefaultMember ()
1545                 {
1546                         return null;
1547                 }
1548
1549                 AttributeUsageAttribute ITypeDefinition.GetAttributeUsage (PredefinedAttribute pa)
1550                 {
1551                         return null;
1552                 }
1553
1554                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
1555                 {
1556                         throw new NotImplementedException ();
1557                 }
1558
1559                 void ITypeDefinition.LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
1560                 {
1561                         throw new NotImplementedException ();
1562                 }
1563
1564                 string[] IMemberDefinition.ConditionalConditions ()
1565                 {
1566                         return null;
1567                 }
1568
1569                 ObsoleteAttribute IMemberDefinition.GetAttributeObsolete ()
1570                 {
1571                         return null;
1572                 }
1573
1574                 bool? IMemberDefinition.CLSAttributeValue {
1575                         get {
1576                                 return null;
1577                         }
1578                 }
1579
1580                 void IMemberDefinition.SetIsAssigned ()
1581                 {
1582                 }
1583
1584                 void IMemberDefinition.SetIsUsed ()
1585                 {
1586                 }
1587
1588                 #endregion
1589         }
1590
1591         //
1592         // Common base class for composite types
1593         //
1594         public abstract class ElementTypeSpec : TypeSpec, ITypeDefinition
1595         {
1596                 protected ElementTypeSpec (MemberKind kind, TypeSpec element, MetaType info)
1597                         : base (kind, element.DeclaringType, null, info, element.Modifiers)
1598                 {
1599                         this.Element = element;
1600
1601                         state &= ~SharedStateFlags;
1602                         state |= (element.state & SharedStateFlags);
1603
1604                         if (element.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
1605                                 state |= StateFlags.HasDynamicElement;
1606
1607                         // Has to use its own type definition instead of just element definition to
1608                         // correctly identify itself for cases like x.MemberDefininition == predefined.MemberDefinition
1609                         this.definition = this;
1610
1611                         cache = MemberCache.Empty;
1612                 }
1613
1614                 #region Properties
1615
1616                 public TypeSpec Element { get; private set; }
1617
1618                 bool ITypeDefinition.IsComImport {
1619                         get {
1620                                 return false;
1621                         }
1622                 }
1623
1624                 bool ITypeDefinition.IsPartial {
1625                         get {
1626                                 return false;
1627                         }
1628                 }
1629
1630                 bool ITypeDefinition.IsTypeForwarder {
1631                         get {
1632                                 return false;
1633                         }
1634                 }
1635
1636                 bool ITypeDefinition.IsCyclicTypeForwarder {
1637                         get {
1638                                 return false;
1639                         }
1640                 }
1641
1642                 public override string Name {
1643                         get {
1644                                 throw new NotSupportedException ();
1645                         }
1646                 }
1647
1648                 #endregion
1649
1650                 public override ObsoleteAttribute GetAttributeObsolete ()
1651                 {
1652                         return Element.GetAttributeObsolete ();
1653                 }
1654
1655                 protected virtual string GetPostfixSignature ()
1656                 {
1657                         return null;
1658                 }
1659
1660                 public override string GetSignatureForDocumentation ()
1661                 {
1662                         return Element.GetSignatureForDocumentation () + GetPostfixSignature ();
1663                 }
1664
1665                 public override string GetSignatureForError ()
1666                 {
1667                         return Element.GetSignatureForError () + GetPostfixSignature ();
1668                 }
1669
1670                 public override TypeSpec Mutate (TypeParameterMutator mutator)
1671                 {
1672                         var me = Element.Mutate (mutator);
1673                         if (me == Element)
1674                                 return this;
1675
1676                         var mutated = (ElementTypeSpec) MemberwiseClone ();
1677                         mutated.Element = me;
1678                         mutated.info = null;
1679                         return mutated;
1680                 }
1681
1682                 #region ITypeDefinition Members
1683
1684                 IAssemblyDefinition ITypeDefinition.DeclaringAssembly {
1685                         get {
1686                                 return Element.MemberDefinition.DeclaringAssembly;
1687                         }
1688                 }
1689
1690                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
1691                 {
1692                         return Element.MemberDefinition.IsInternalAsPublic (assembly);
1693                 }
1694
1695                 public string Namespace {
1696                         get { throw new NotImplementedException (); }
1697                 }
1698
1699                 public int TypeParametersCount {
1700                         get {
1701                                 return 0;
1702                         }
1703                 }
1704
1705                 public TypeParameterSpec[] TypeParameters {
1706                         get {
1707                                 throw new NotSupportedException ();
1708                         }
1709                 }
1710
1711                 public TypeSpec GetAttributeCoClass ()
1712                 {
1713                         return Element.MemberDefinition.GetAttributeCoClass ();
1714                 }
1715
1716                 public string GetAttributeDefaultMember ()
1717                 {
1718                         return Element.MemberDefinition.GetAttributeDefaultMember ();
1719                 }
1720
1721                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
1722                 {
1723                         Element.MemberDefinition.LoadMembers (declaringType, onlyTypes, ref cache);
1724                 }
1725
1726                 public bool IsImported {
1727                         get {
1728                                 return Element.MemberDefinition.IsImported;
1729                         }
1730                 }
1731
1732                 public string[] ConditionalConditions ()
1733                 {
1734                         return Element.MemberDefinition.ConditionalConditions ();
1735                 }
1736
1737                 bool? IMemberDefinition.CLSAttributeValue {
1738                         get {
1739                                 return Element.MemberDefinition.CLSAttributeValue;
1740                         }
1741                 }
1742
1743                 public void SetIsAssigned ()
1744                 {
1745                         Element.MemberDefinition.SetIsAssigned ();
1746                 }
1747
1748                 public void SetIsUsed ()
1749                 {
1750                         Element.MemberDefinition.SetIsUsed ();
1751                 }
1752
1753                 #endregion
1754         }
1755
1756         public class ArrayContainer : ElementTypeSpec
1757         {
1758                 public struct TypeRankPair : IEquatable<TypeRankPair>
1759                 {
1760                         TypeSpec ts;
1761                         int rank;
1762
1763                         public TypeRankPair (TypeSpec ts, int rank)
1764                         {
1765                                 this.ts = ts;
1766                                 this.rank = rank;
1767                         }
1768
1769                         public override int GetHashCode ()
1770                         {
1771                                 return ts.GetHashCode () ^ rank.GetHashCode ();
1772                         }
1773
1774                         #region IEquatable<Tuple<T1,T2>> Members
1775
1776                         public bool Equals (TypeRankPair other)
1777                         {
1778                                 return other.ts == ts && other.rank == rank;
1779                         }
1780
1781                         #endregion
1782                 }
1783
1784                 readonly int rank;
1785                 readonly ModuleContainer module;
1786
1787                 private ArrayContainer (ModuleContainer module, TypeSpec element, int rank)
1788                         : base (MemberKind.ArrayType, element, null)
1789                 {
1790                         this.module = module;
1791                         this.rank = rank;
1792                 }
1793
1794                 public int Rank {
1795                         get {
1796                                 return rank;
1797                         }
1798                 }
1799
1800                 public MethodInfo GetConstructor ()
1801                 {
1802                         var mb = module.Builder;
1803
1804                         var arg_types = new MetaType[rank];
1805                         for (int i = 0; i < rank; i++)
1806                                 arg_types[i] = module.Compiler.BuiltinTypes.Int.GetMetaInfo ();
1807
1808                         var ctor = mb.GetArrayMethod (
1809                                 GetMetaInfo (), Constructor.ConstructorName,
1810                                 CallingConventions.HasThis,
1811                                 null, arg_types);
1812
1813                         return ctor;
1814                 }
1815
1816                 public MethodInfo GetAddressMethod ()
1817                 {
1818                         var mb = module.Builder;
1819
1820                         var arg_types = new MetaType[rank];
1821                         for (int i = 0; i < rank; i++)
1822                                 arg_types[i] = module.Compiler.BuiltinTypes.Int.GetMetaInfo ();
1823
1824                         var address = mb.GetArrayMethod (
1825                                 GetMetaInfo (), "Address",
1826                                 CallingConventions.HasThis | CallingConventions.Standard,
1827                                 ReferenceContainer.MakeType (module, Element).GetMetaInfo (), arg_types);
1828
1829                         return address;
1830                 }
1831
1832                 public MethodInfo GetGetMethod ()
1833                 {
1834                         var mb = module.Builder;
1835
1836                         var arg_types = new MetaType[rank];
1837                         for (int i = 0; i < rank; i++)
1838                                 arg_types[i] = module.Compiler.BuiltinTypes.Int.GetMetaInfo ();
1839
1840                         var get = mb.GetArrayMethod (
1841                                 GetMetaInfo (), "Get",
1842                                 CallingConventions.HasThis | CallingConventions.Standard,
1843                                 Element.GetMetaInfo (), arg_types);
1844
1845                         return get;
1846                 }
1847
1848                 public MethodInfo GetSetMethod ()
1849                 {
1850                         var mb = module.Builder;
1851
1852                         var arg_types = new MetaType[rank + 1];
1853                         for (int i = 0; i < rank; i++)
1854                                 arg_types[i] = module.Compiler.BuiltinTypes.Int.GetMetaInfo ();
1855
1856                         arg_types[rank] = Element.GetMetaInfo ();
1857
1858                         var set = mb.GetArrayMethod (
1859                                 GetMetaInfo (), "Set",
1860                                 CallingConventions.HasThis | CallingConventions.Standard,
1861                                 module.Compiler.BuiltinTypes.Void.GetMetaInfo (), arg_types);
1862
1863                         return set;
1864                 }
1865
1866                 public override MetaType GetMetaInfo ()
1867                 {
1868                         if (info == null) {
1869                                 if (rank == 1)
1870                                         info = Element.GetMetaInfo ().MakeArrayType ();
1871                                 else
1872                                         info = Element.GetMetaInfo ().MakeArrayType (rank);
1873                         }
1874
1875                         return info;
1876                 }
1877
1878                 protected override string GetPostfixSignature()
1879                 {
1880                         return GetPostfixSignature (rank);
1881                 }
1882
1883                 public static string GetPostfixSignature (int rank)
1884                 {
1885                         StringBuilder sb = new StringBuilder ();
1886                         sb.Append ("[");
1887                         for (int i = 1; i < rank; i++) {
1888                                 sb.Append (",");
1889                         }
1890                         sb.Append ("]");
1891
1892                         return sb.ToString ();
1893                 }
1894
1895                 public override string GetSignatureForDocumentation ()
1896                 {
1897                         StringBuilder sb = new StringBuilder ();
1898                         GetElementSignatureForDocumentation (sb);
1899                         return sb.ToString ();
1900                 }
1901
1902                 void GetElementSignatureForDocumentation (StringBuilder sb)
1903                 {
1904                         var ac = Element as ArrayContainer;
1905                         if (ac == null)
1906                                 sb.Append (Element.GetSignatureForDocumentation ());
1907                         else
1908                                 ac.GetElementSignatureForDocumentation (sb);
1909
1910                         sb.Append ("[");
1911                         for (int i = 1; i < rank; i++) {
1912                                 if (i == 1)
1913                                         sb.Append ("0:");
1914
1915                                 sb.Append (",0:");
1916                         }
1917                         sb.Append ("]");
1918                 }
1919
1920                 public static ArrayContainer MakeType (ModuleContainer module, TypeSpec element)
1921                 {
1922                         return MakeType (module, element, 1);
1923                 }
1924
1925                 public static ArrayContainer MakeType (ModuleContainer module, TypeSpec element, int rank)
1926                 {
1927                         ArrayContainer ac;
1928                         var key = new TypeRankPair (element, rank);
1929                         if (!module.ArrayTypesCache.TryGetValue (key, out ac)) {
1930                                 ac = new ArrayContainer (module, element, rank);
1931                                 ac.BaseType = module.Compiler.BuiltinTypes.Array;
1932                                 ac.Interfaces = ac.BaseType.Interfaces;
1933
1934                                 module.ArrayTypesCache.Add (key, ac);
1935                         }
1936
1937                         return ac;
1938                 }
1939         }
1940
1941         class ReferenceContainer : ElementTypeSpec
1942         {
1943                 private ReferenceContainer (TypeSpec element)
1944                         : base (MemberKind.Class, element, null)        // TODO: Kind.Class is most likely wrong
1945                 {
1946                 }
1947
1948                 public override MetaType GetMetaInfo ()
1949                 {
1950                         if (info == null) {
1951                                 info = Element.GetMetaInfo ().MakeByRefType ();
1952                         }
1953
1954                         return info;
1955                 }
1956
1957                 public static ReferenceContainer MakeType (ModuleContainer module, TypeSpec element)
1958                 {
1959                         ReferenceContainer pc;
1960                         if (!module.ReferenceTypesCache.TryGetValue (element, out pc)) {
1961                                 pc = new ReferenceContainer (element);
1962                                 module.ReferenceTypesCache.Add (element, pc);
1963                         }
1964
1965                         return pc;
1966                 }
1967         }
1968
1969         class PointerContainer : ElementTypeSpec
1970         {
1971                 private PointerContainer (TypeSpec element)
1972                         : base (MemberKind.PointerType, element, null)
1973                 {
1974                         // It's never CLS-Compliant
1975                         state &= ~StateFlags.CLSCompliant_Undetected;
1976                 }
1977
1978                 public override MetaType GetMetaInfo ()
1979                 {
1980                         if (info == null) {
1981                                 info = Element.GetMetaInfo ().MakePointerType ();
1982                         }
1983
1984                         return info;
1985                 }
1986
1987                 protected override string GetPostfixSignature()
1988                 {
1989                         return "*";
1990                 }
1991
1992                 public static PointerContainer MakeType (ModuleContainer module, TypeSpec element)
1993                 {
1994                         PointerContainer pc;
1995                         if (!module.PointerTypesCache.TryGetValue (element, out pc)) {
1996                                 pc = new PointerContainer (element);
1997                                 module.PointerTypesCache.Add (element, pc);
1998                         }
1999
2000                         return pc;
2001                 }
2002         }
2003
2004         public class MissingTypeSpecReference
2005         {
2006                 public MissingTypeSpecReference (TypeSpec type, MemberSpec caller)
2007                 {
2008                         Type = type;
2009                         Caller = caller;
2010                 }
2011
2012                 public TypeSpec Type { get; private set; }
2013                 public MemberSpec Caller { get; private set; }
2014         }
2015 }