mcs/mcs/decl.cs

   1 //
   2 // decl.cs: Declaration base class for structs, classes, enums and interfaces.
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Dual licensed under the terms of the MIT X11 or GNU GPL
   8 //
   9 // Copyright 2001 Ximian, Inc (http://www.ximian.com)
  10 // Copyright 2004-2008 Novell, Inc
  11 //
  12 //
  13
  14 using System;
  15 using System.Text;
  16 using System.Collections.Generic;
  17 using System.Globalization;
  18 using System.Reflection.Emit;
  19 using System.Reflection;
  20
  21 #if NET_2_1
  22 using XmlElement = System.Object;
  23 #else
  24 using System.Xml;
  25 #endif
  26
  27 namespace Mono.CSharp {
  28
  29         //
  30         // Better name would be DottenName
  31         //
  32         public class MemberName {
  33                 public readonly string Name;
  34                 public TypeArguments TypeArguments;
  35
  36                 public readonly MemberName Left;
  37                 public readonly Location Location;
  38
  39                 public static readonly MemberName Null = new MemberName ("");
  40
  41                 bool is_double_colon;
  42
  43                 private MemberName (MemberName left, string name, bool is_double_colon,
  44                                     Location loc)
  45                 {
  46                         this.Name = name;
  47                         this.Location = loc;
  48                         this.is_double_colon = is_double_colon;
  49                         this.Left = left;
  50                 }
  51
  52                 private MemberName (MemberName left, string name, bool is_double_colon,
  53                                     TypeArguments args, Location loc)
  54                         : this (left, name, is_double_colon, loc)
  55                 {
  56                         if (args != null && args.Count > 0)
  57                                 this.TypeArguments = args;
  58                 }
  59
  60                 public MemberName (string name)
  61                         : this (name, Location.Null)
  62                 { }
  63
  64                 public MemberName (string name, Location loc)
  65                         : this (null, name, false, loc)
  66                 { }
  67
  68                 public MemberName (string name, TypeArguments args, Location loc)
  69                         : this (null, name, false, args, loc)
  70                 { }
  71
  72                 public MemberName (MemberName left, string name)
  73                         : this (left, name, left != null ? left.Location : Location.Null)
  74                 { }
  75
  76                 public MemberName (MemberName left, string name, Location loc)
  77                         : this (left, name, false, loc)
  78                 { }
  79
  80                 public MemberName (MemberName left, string name, TypeArguments args, Location loc)
  81                         : this (left, name, false, args, loc)
  82                 { }
  83
  84                 public MemberName (string alias, string name, TypeArguments args, Location loc)
  85                         : this (new MemberName (alias, loc), name, true, args, loc)
  86                 { }
  87
  88                 public MemberName (MemberName left, MemberName right)
  89                         : this (left, right, right.Location)
  90                 { }
  91
  92                 public MemberName (MemberName left, MemberName right, Location loc)
  93                         : this (null, right.Name, false, right.TypeArguments, loc)
  94                 {
  95                         if (right.is_double_colon)
  96                                 throw new InternalErrorException ("Cannot append double_colon member name");
  97                         this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  98                 }
  99
 100                 // TODO: Remove
 101                 public string GetName ()
 102                 {
 103                         return GetName (false);
 104                 }
 105
 106                 public int Arity {
 107                         get {
 108                                 return TypeArguments == null ? 0 : TypeArguments.Count;
 109                         }
 110                 }
 111
 112                 public bool IsGeneric {
 113                         get {
 114                                 if (TypeArguments != null)
 115                                         return true;
 116                                 else if (Left != null)
 117                                         return Left.IsGeneric;
 118                                 else
 119                                         return false;
 120                         }
 121                 }
 122
 123                 public string GetName (bool is_generic)
 124                 {
 125                         string name = is_generic ? Basename : Name;
 126                         if (Left != null)
 127                                 return Left.GetName (is_generic) + (is_double_colon ? "::" : ".") + name;
 128
 129                         return name;
 130                 }
 131
 132                 public ATypeNameExpression GetTypeExpression ()
 133                 {
 134                         if (Left == null) {
 135                                 if (TypeArguments != null)
 136                                         return new SimpleName (Name, TypeArguments, Location);
 137
 138                                 return new SimpleName (Name, Location);
 139                         }
 140
 141                         if (is_double_colon) {
 142                                 if (Left.Left != null)
 143                                         throw new InternalErrorException ("The left side of a :: should be an identifier");
 144                                 return new QualifiedAliasMember (Left.Name, Name, TypeArguments, Location);
 145                         }
 146
 147                         Expression lexpr = Left.GetTypeExpression ();
 148                         return new MemberAccess (lexpr, Name, TypeArguments, Location);
 149                 }
 150
 151                 public MemberName Clone ()
 152                 {
 153                         MemberName left_clone = Left == null ? null : Left.Clone ();
 154                         return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
 155                 }
 156
 157                 public string Basename {
 158                         get {
 159                                 if (TypeArguments != null)
 160                                         return MakeName (Name, TypeArguments);
 161                                 return Name;
 162                         }
 163                 }
 164
 165                 public string GetSignatureForError ()
 166                 {
 167                         string append = TypeArguments == null ? "" : "<" + TypeArguments.GetSignatureForError () + ">";
 168                         if (Left == null)
 169                                 return Name + append;
 170                         string connect = is_double_colon ? "::" : ".";
 171                         return Left.GetSignatureForError () + connect + Name + append;
 172                 }
 173
 174                 public override bool Equals (object other)
 175                 {
 176                         return Equals (other as MemberName);
 177                 }
 178
 179                 public bool Equals (MemberName other)
 180                 {
 181                         if (this == other)
 182                                 return true;
 183                         if (other == null || Name != other.Name)
 184                                 return false;
 185                         if (is_double_colon != other.is_double_colon)
 186                                 return false;
 187
 188                         if ((TypeArguments != null) &&
 189                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 190                                 return false;
 191
 192                         if ((TypeArguments == null) && (other.TypeArguments != null))
 193                                 return false;
 194
 195                         if (Left == null)
 196                                 return other.Left == null;
 197
 198                         return Left.Equals (other.Left);
 199                 }
 200
 201                 public override int GetHashCode ()
 202                 {
 203                         int hash = Name.GetHashCode ();
 204                         for (MemberName n = Left; n != null; n = n.Left)
 205                                 hash ^= n.Name.GetHashCode ();
 206                         if (is_double_colon)
 207                                 hash ^= 0xbadc01d;
 208
 209                         if (TypeArguments != null)
 210                                 hash ^= TypeArguments.Count << 5;
 211
 212                         return hash & 0x7FFFFFFF;
 213                 }
 214
 215                 public int CountTypeArguments {
 216                         get {
 217                                 if (TypeArguments != null)
 218                                         return TypeArguments.Count;
 219                                 else if (Left != null)
 220                                         return Left.CountTypeArguments;
 221                                 else
 222                                         return 0;
 223                         }
 224                 }
 225
 226                 public static string MakeName (string name, TypeArguments args)
 227                 {
 228                         if (args == null)
 229                                 return name;
 230
 231                         return name + "`" + args.Count;
 232                 }
 233
 234                 public static string MakeName (string name, int count)
 235                 {
 236                         return name + "`" + count;
 237                 }
 238         }
 239
 240         public class SimpleMemberName
 241         {
 242                 public string Value;
 243                 public Location Location;
 244
 245                 public SimpleMemberName (string name, Location loc)
 246                 {
 247                         this.Value = name;
 248                         this.Location = loc;
 249                 }
 250         }
 251
 252         /// <summary>
 253         ///   Base representation for members.  This is used to keep track
 254         ///   of Name, Location and Modifier flags, and handling Attributes.
 255         /// </summary>
 256         [System.Diagnostics.DebuggerDisplay ("{GetSignatureForError()}")]
 257         public abstract class MemberCore : Attributable, IMemberContext, IMemberDefinition
 258         {
 259                 /// <summary>
 260                 ///   Public name
 261                 /// </summary>
 262
 263                 protected string cached_name;
 264                 // TODO: Remove in favor of MemberName
 265                 public string Name {
 266                         get {
 267                                 if (cached_name == null)
 268                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 269                                 return cached_name;
 270                         }
 271                 }
 272
 273                 string IMemberDefinition.Name {
 274                         get {
 275                                 return member_name.Name;
 276                         }
 277                 }
 278
 279                 // Is not readonly because of IndexerName attribute
 280                 private MemberName member_name;
 281                 public MemberName MemberName {
 282                         get { return member_name; }
 283                 }
 284
 285                 /// <summary>
 286                 ///   Modifier flags that the user specified in the source code
 287                 /// </summary>
 288                 private Modifiers mod_flags;
 289                 public Modifiers ModFlags {
 290                         set {
 291                                 mod_flags = value;
 292                                 if ((value & Modifiers.COMPILER_GENERATED) != 0)
 293                                         caching_flags = Flags.IsUsed | Flags.IsAssigned;
 294                         }
 295                         get {
 296                                 return mod_flags;
 297                         }
 298                 }
 299
 300                 public /*readonly*/ TypeContainer Parent;
 301
 302                 /// <summary>
 303                 ///   Location where this declaration happens
 304                 /// </summary>
 305                 public Location Location {
 306                         get { return member_name.Location; }
 307                 }
 308
 309                 /// <summary>
 310                 ///   XML documentation comment
 311                 /// </summary>
 312                 protected string comment;
 313
 314                 /// <summary>
 315                 ///   Represents header string for documentation comment
 316                 ///   for each member types.
 317                 /// </summary>
 318                 public abstract string DocCommentHeader { get; }
 319
 320                 [Flags]
 321                 public enum Flags {
 322                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 323                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 324                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 325                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 326                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 327                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 328                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 329                         ClsCompliantAttributeFalse = 1 << 7,                    // Member has CLSCompliant(false)
 330                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 331                         Excluded = 1 << 9,                                      // Method is conditional
 332                         MethodOverloadsExist = 1 << 10,         // Test for duplication must be performed
 333                         IsUsed = 1 << 11,
 334                         IsAssigned = 1 << 12,                           // Field is assigned
 335                         HasExplicitLayout       = 1 << 13,
 336                         PartialDefinitionExists = 1 << 14,      // Set when corresponding partial method definition exists
 337                         HasStructLayout         = 1 << 15                       // Has StructLayoutAttribute
 338                 }
 339
 340                 /// <summary>
 341                 ///   MemberCore flags at first detected then cached
 342                 /// </summary>
 343                 internal Flags caching_flags;
 344
 345                 public MemberCore (DeclSpace parent, MemberName name, Attributes attrs)
 346                 {
 347                         this.Parent = parent as TypeContainer;
 348                         member_name = name;
 349                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 350                         AddAttributes (attrs, this);
 351                 }
 352
 353                 public virtual Assembly Assembly {
 354                         get { return Parent.Module.Assembly; }
 355                 }
 356
 357                 protected virtual void SetMemberName (MemberName new_name)
 358                 {
 359                         member_name = new_name;
 360                         cached_name = null;
 361                 }
 362
 363                 protected bool CheckAbstractAndExtern (bool has_block)
 364                 {
 365                         if (Parent.PartialContainer.Kind == MemberKind.Interface)
 366                                 return true;
 367
 368                         if (has_block) {
 369                                 if ((ModFlags & Modifiers.EXTERN) != 0) {
 370                                         Report.Error (179, Location, "`{0}' cannot declare a body because it is marked extern",
 371                                                 GetSignatureForError ());
 372                                         return false;
 373                                 }
 374
 375                                 if ((ModFlags & Modifiers.ABSTRACT) != 0) {
 376                                         Report.Error (500, Location, "`{0}' cannot declare a body because it is marked abstract",
 377                                                 GetSignatureForError ());
 378                                         return false;
 379                                 }
 380                         } else {
 381                                 if ((ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN | Modifiers.PARTIAL)) == 0 && !(Parent is Delegate)) {
 382                                         if (RootContext.Version >= LanguageVersion.V_3) {
 383                                                 Property.PropertyMethod pm = this as Property.PropertyMethod;
 384                                                 if (pm is Indexer.GetIndexerMethod || pm is Indexer.SetIndexerMethod)
 385                                                         pm = null;
 386
 387                                                 if (pm != null && pm.Property.AccessorSecond == null) {
 388                                                         Report.Error (840, Location,
 389                                                                 "`{0}' must have a body because it is not marked abstract or extern. The property can be automatically implemented when you define both accessors",
 390                                                                 GetSignatureForError ());
 391                                                         return false;
 392                                                 }
 393                                         }
 394
 395                                         Report.Error (501, Location, "`{0}' must have a body because it is not marked abstract, extern, or partial",
 396                                                       GetSignatureForError ());
 397                                         return false;
 398                                 }
 399                         }
 400
 401                         return true;
 402                 }
 403
 404                 protected void CheckProtectedModifier ()
 405                 {
 406                         if ((ModFlags & Modifiers.PROTECTED) == 0)
 407                                 return;
 408
 409                         if (Parent.PartialContainer.Kind == MemberKind.Struct) {
 410                                 Report.Error (666, Location, "`{0}': Structs cannot contain protected members",
 411                                         GetSignatureForError ());
 412                                 return;
 413                         }
 414
 415                         if ((Parent.ModFlags & Modifiers.STATIC) != 0) {
 416                                 Report.Error (1057, Location, "`{0}': Static classes cannot contain protected members",
 417                                         GetSignatureForError ());
 418                                 return;
 419                         }
 420
 421                         if ((Parent.ModFlags & Modifiers.SEALED) != 0 && (ModFlags & Modifiers.OVERRIDE) == 0 &&
 422                                 !(this is Destructor)) {
 423                                 Report.Warning (628, 4, Location, "`{0}': new protected member declared in sealed class",
 424                                         GetSignatureForError ());
 425                                 return;
 426                         }
 427                 }
 428
 429                 public abstract bool Define ();
 430
 431                 public virtual string DocComment {
 432                         get {
 433                                 return comment;
 434                         }
 435                         set {
 436                                 comment = value;
 437                         }
 438                 }
 439
 440                 //
 441                 // Returns full member name for error message
 442                 //
 443                 public virtual string GetSignatureForError ()
 444                 {
 445                         if (Parent == null || Parent.Parent == null)
 446                                 return member_name.GetSignatureForError ();
 447
 448                         return Parent.GetSignatureForError () + "." + member_name.GetSignatureForError ();
 449                 }
 450
 451                 /// <summary>
 452                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 453                 /// </summary>
 454                 public virtual void Emit ()
 455                 {
 456                         if (!RootContext.VerifyClsCompliance)
 457                                 return;
 458
 459                         VerifyClsCompliance ();
 460                 }
 461
 462                 public bool IsCompilerGenerated {
 463                         get     {
 464                                 if ((mod_flags & Modifiers.COMPILER_GENERATED) != 0)
 465                                         return true;
 466
 467                                 return Parent == null ? false : Parent.IsCompilerGenerated;
 468                         }
 469                 }
 470
 471                 public bool IsImported {
 472                         get {
 473                                 return false;
 474                         }
 475                 }
 476
 477                 public virtual bool IsUsed {
 478                         get {
 479                                 return (caching_flags & Flags.IsUsed) != 0;
 480                         }
 481                 }
 482
 483                 protected Report Report {
 484                         get {
 485                                 return Compiler.Report;
 486                         }
 487                 }
 488
 489                 public void SetIsUsed ()
 490                 {
 491                         caching_flags |= Flags.IsUsed;
 492                 }
 493
 494                 public void SetIsAssigned ()
 495                 {
 496                         caching_flags |= Flags.IsAssigned;
 497                 }
 498
 499                 /// <summary>
 500                 /// Returns instance of ObsoleteAttribute for this MemberCore
 501                 /// </summary>
 502                 public virtual ObsoleteAttribute GetAttributeObsolete ()
 503                 {
 504                         if ((caching_flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0)
 505                                 return null;
 506
 507                         caching_flags &= ~Flags.Obsolete_Undetected;
 508
 509                         if (OptAttributes == null)
 510                                 return null;
 511
 512                         Attribute obsolete_attr = OptAttributes.Search (Compiler.PredefinedAttributes.Obsolete);
 513                         if (obsolete_attr == null)
 514                                 return null;
 515
 516                         caching_flags |= Flags.Obsolete;
 517
 518                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute ();
 519                         if (obsolete == null)
 520                                 return null;
 521
 522                         return obsolete;
 523                 }
 524
 525                 /// <summary>
 526                 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
 527                 /// </summary>
 528                 public virtual void CheckObsoleteness (Location loc)
 529                 {
 530                         ObsoleteAttribute oa = GetAttributeObsolete ();
 531                         if (oa != null)
 532                                 AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc, Report);
 533                 }
 534
 535                 //
 536                 // Checks whether the type P is as accessible as this member
 537                 //
 538                 public bool IsAccessibleAs (TypeSpec p)
 539                 {
 540                         //
 541                         // if M is private, its accessibility is the same as this declspace.
 542                         // we already know that P is accessible to T before this method, so we
 543                         // may return true.
 544                         //
 545                         if ((mod_flags & Modifiers.PRIVATE) != 0)
 546                                 return true;
 547
 548                         while (TypeManager.HasElementType (p))
 549                                 p = TypeManager.GetElementType (p);
 550
 551                         if (p.IsGenericParameter)
 552                                 return true;
 553
 554                         for (TypeSpec p_parent; p != null; p = p_parent) {
 555                                 p_parent = p.DeclaringType;
 556
 557                                 if (p.IsGeneric) {
 558                                         foreach (TypeSpec t in p.TypeArguments) {
 559                                                 if (!IsAccessibleAs (t))
 560                                                         return false;
 561                                         }
 562                                 }
 563
 564                                 var pAccess = p.Modifiers & Modifiers.AccessibilityMask;
 565                                 if (pAccess == Modifiers.PUBLIC)
 566                                         continue;
 567
 568                                 bool same_access_restrictions = false;
 569                                 for (MemberCore mc = this; !same_access_restrictions && mc != null && mc.Parent != null; mc = mc.Parent) {
 570                                         var al = mc.ModFlags & Modifiers.AccessibilityMask;
 571                                         switch (pAccess) {
 572                                         case Modifiers.INTERNAL:
 573                                                 if (al == Modifiers.PRIVATE || al == Modifiers.INTERNAL)
 574                                                         same_access_restrictions = TypeManager.IsThisOrFriendAssembly (Parent.Module.Assembly, p.Assembly);
 575
 576                                                 break;
 577
 578                                         case Modifiers.PROTECTED:
 579                                                 if (al == Modifiers.PROTECTED) {
 580                                                         same_access_restrictions = mc.Parent.IsBaseTypeDefinition (p_parent);
 581                                                         break;
 582                                                 }
 583
 584                                                 if (al == Modifiers.PRIVATE) {
 585                                                         //
 586                                                         // When type is private and any of its parents derives from
 587                                                         // protected type then the type is accessible
 588                                                         //
 589                                                         while (mc.Parent != null) {
 590                                                                 if (mc.Parent.IsBaseTypeDefinition (p_parent))
 591                                                                         same_access_restrictions = true;
 592                                                                 mc = mc.Parent;
 593                                                         }
 594                                                 }
 595
 596                                                 break;
 597
 598                                         case Modifiers.PROTECTED | Modifiers.INTERNAL:
 599                                                 if (al == Modifiers.INTERNAL)
 600                                                         same_access_restrictions = TypeManager.IsThisOrFriendAssembly (Parent.Module.Assembly, p.Assembly);
 601                                                 else if (al == (Modifiers.PROTECTED | Modifiers.INTERNAL))
 602                                                         same_access_restrictions = mc.Parent.IsBaseTypeDefinition (p_parent) &&
 603                                                                 TypeManager.IsThisOrFriendAssembly (Parent.Module.Assembly, p.Assembly);
 604                                                 else
 605                                                         goto case Modifiers.PROTECTED;
 606
 607                                                 break;
 608
 609                                         case Modifiers.PRIVATE:
 610                                                 //
 611                                                 // Both are private and share same parent
 612                                                 //
 613                                                 if (al == Modifiers.PRIVATE) {
 614                                                         var decl = mc.Parent;
 615                                                         do {
 616                                                                 same_access_restrictions = decl.CurrentType == p_parent;
 617                                                         } while (!same_access_restrictions && !decl.IsTopLevel && (decl = decl.Parent) != null);
 618                                                 }
 619
 620                                                 break;
 621
 622                                         default:
 623                                                 throw new InternalErrorException (al.ToString ());
 624                                         }
 625                                 }
 626
 627                                 if (!same_access_restrictions)
 628                                         return false;
 629                         }
 630
 631                         return true;
 632                 }
 633
 634                 /// <summary>
 635                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 636                 /// </summary>
 637                 public override bool IsClsComplianceRequired ()
 638                 {
 639                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 640                                 return (caching_flags & Flags.ClsCompliant) != 0;
 641
 642                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 643
 644                         if (HasClsCompliantAttribute) {
 645                                 if ((caching_flags & Flags.ClsCompliantAttributeFalse) != 0)
 646                                         return false;
 647
 648                                 caching_flags |= Flags.ClsCompliant;
 649                                 return true;
 650                         }
 651
 652                         if (Parent.PartialContainer.IsClsComplianceRequired ()) {
 653                                 caching_flags |= Flags.ClsCompliant;
 654                                 return true;
 655                         }
 656
 657                         return false;
 658                 }
 659
 660                 public virtual string[] ConditionalConditions ()
 661                 {
 662                         return null;
 663                 }
 664
 665                 /// <summary>
 666                 /// Returns true when MemberCore is exposed from assembly.
 667                 /// </summary>
 668                 public bool IsExposedFromAssembly ()
 669                 {
 670                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 671                                 return false;
 672
 673                         DeclSpace parentContainer = Parent.PartialContainer;
 674                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 675                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 676                                         return false;
 677                                 parentContainer = parentContainer.Parent;
 678                         }
 679                         return true;
 680                 }
 681
 682                 public virtual IList<MethodSpec> LookupExtensionMethod (TypeSpec extensionType, string name, int arity, ref NamespaceEntry scope)
 683                 {
 684                         return Parent.LookupExtensionMethod (extensionType, name, arity, ref scope);
 685                 }
 686
 687                 public virtual FullNamedExpression LookupNamespaceAlias (string name)
 688                 {
 689                         return Parent.NamespaceEntry.LookupNamespaceAlias (name);
 690                 }
 691
 692                 public virtual FullNamedExpression LookupNamespaceOrType (string name, int arity, Location loc, bool ignore_cs0104)
 693                 {
 694                         return Parent.LookupNamespaceOrType (name, arity, loc, ignore_cs0104);
 695                 }
 696
 697                 /// <summary>
 698                 /// Goes through class hierarchy and gets value of first found CLSCompliantAttribute.
 699                 /// If no is attribute exists then assembly CLSCompliantAttribute is returned.
 700                 /// </summary>
 701                 public bool IsNotCLSCompliant ()
 702                 {
 703                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 704                                 return (caching_flags & Flags.ClsCompliantAttributeFalse) != 0;
 705
 706                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 707
 708                         if (OptAttributes != null) {
 709                                 Attribute cls_attribute = OptAttributes.Search (Compiler.PredefinedAttributes.CLSCompliant);
 710                                 if (cls_attribute != null) {
 711                                         caching_flags |= Flags.HasClsCompliantAttribute;
 712                                         if (cls_attribute.GetClsCompliantAttributeValue ())
 713                                                 return false;
 714
 715                                         caching_flags |= Flags.ClsCompliantAttributeFalse;
 716                                         return true;
 717                                 }
 718                         }
 719
 720                         return false;
 721                 }
 722
 723                 /// <summary>
 724                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 725                 /// </summary>
 726                 protected bool HasClsCompliantAttribute {
 727                         get {
 728                                 if ((caching_flags & Flags.HasCompliantAttribute_Undetected) != 0)
 729                                         IsNotCLSCompliant ();
 730
 731                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 732                         }
 733                 }
 734
 735                 /// <summary>
 736                 /// Returns true when a member supports multiple overloads (methods, indexers, etc)
 737                 /// </summary>
 738                 public virtual bool EnableOverloadChecks (MemberCore overload)
 739                 {
 740                         return false;
 741                 }
 742
 743                 /// <summary>
 744                 /// The main virtual method for CLS-Compliant verifications.
 745                 /// The method returns true if member is CLS-Compliant and false if member is not
 746                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 747                 /// and add their extra verifications.
 748                 /// </summary>
 749                 protected virtual bool VerifyClsCompliance ()
 750                 {
 751                         if (HasClsCompliantAttribute) {
 752                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
 753                                         Attribute a = OptAttributes.Search (Compiler.PredefinedAttributes.CLSCompliant);
 754                                         if ((caching_flags & Flags.ClsCompliantAttributeFalse) != 0) {
 755                                                 Report.Warning (3021, 2, a.Location,
 756                                                         "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant",
 757                                                         GetSignatureForError ());
 758                                         } else {
 759                                                 Report.Warning (3014, 1, a.Location,
 760                                                         "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 761                                                         GetSignatureForError ());
 762                                         }
 763                                         return false;
 764                                 }
 765
 766                                 if (!IsExposedFromAssembly ()) {
 767                                         Attribute a = OptAttributes.Search (Compiler.PredefinedAttributes.CLSCompliant);
 768                                         Report.Warning (3019, 2, a.Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
 769                                         return false;
 770                                 }
 771
 772                                 if ((caching_flags & Flags.ClsCompliantAttributeFalse) != 0) {
 773                                         if (Parent.Kind == MemberKind.Interface && Parent.IsClsComplianceRequired ()) {
 774                                                 Report.Warning (3010, 1, Location, "`{0}': CLS-compliant interfaces must have only CLS-compliant members", GetSignatureForError ());
 775                                         } else if (Parent.Kind == MemberKind.Class && (ModFlags & Modifiers.ABSTRACT) != 0 && Parent.IsClsComplianceRequired ()) {
 776                                                 Report.Warning (3011, 1, Location, "`{0}': only CLS-compliant members can be abstract", GetSignatureForError ());
 777                                         }
 778
 779                                         return false;
 780                                 }
 781
 782                                 if (Parent.Parent != null && !Parent.IsClsComplianceRequired ()) {
 783                                         Attribute a = OptAttributes.Search (Compiler.PredefinedAttributes.CLSCompliant);
 784                                         Report.Warning (3018, 1, a.Location, "`{0}' cannot be marked as CLS-compliant because it is a member of non CLS-compliant type `{1}'",
 785                                                 GetSignatureForError (), Parent.GetSignatureForError ());
 786                                         return false;
 787                                 }
 788                         } else {
 789                                 if (!IsExposedFromAssembly ())
 790                                         return false;
 791
 792                                 if (!Parent.PartialContainer.IsClsComplianceRequired ())
 793                                         return false;
 794                         }
 795
 796                         if (member_name.Name [0] == '_') {
 797                                 Report.Warning (3008, 1, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 798                         }
 799
 800                         return true;
 801                 }
 802
 803                 //
 804                 // Raised (and passed an XmlElement that contains the comment)
 805                 // when GenerateDocComment is writing documentation expectedly.
 806                 //
 807                 internal virtual void OnGenerateDocComment (XmlElement intermediateNode)
 808                 {
 809                 }
 810
 811                 //
 812                 // Returns a string that represents the signature for this
 813                 // member which should be used in XML documentation.
 814                 //
 815                 public virtual string GetDocCommentName (DeclSpace ds)
 816                 {
 817                         if (ds == null || this is DeclSpace)
 818                                 return DocCommentHeader + Name;
 819                         else
 820                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 821                 }
 822
 823                 //
 824                 // Generates xml doc comments (if any), and if required,
 825                 // handle warning report.
 826                 //
 827                 internal virtual void GenerateDocComment (DeclSpace ds)
 828                 {
 829                         try {
 830                                 DocUtil.GenerateDocComment (this, ds, Report);
 831                         } catch (Exception e) {
 832                                 throw new InternalErrorException (this, e);
 833                         }
 834                 }
 835
 836                 #region IMemberContext Members
 837
 838                 public virtual CompilerContext Compiler {
 839                         get { return Parent.Compiler; }
 840                 }
 841
 842                 public virtual TypeSpec CurrentType {
 843                         get { return Parent.CurrentType; }
 844                 }
 845
 846                 public MemberCore CurrentMemberDefinition {
 847                         get { return this; }
 848                 }
 849
 850                 public virtual TypeParameter[] CurrentTypeParameters {
 851                         get { return null; }
 852                 }
 853
 854                 public virtual bool HasUnresolvedConstraints {
 855                         get { return false; }
 856                 }
 857
 858                 public bool IsObsolete {
 859                         get {
 860                                 if (GetAttributeObsolete () != null)
 861                                         return true;
 862
 863                                 return Parent == null ? false : Parent.IsObsolete;
 864                         }
 865                 }
 866
 867                 public bool IsUnsafe {
 868                         get {
 869                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 870                                         return true;
 871
 872                                 return Parent == null ? false : Parent.IsUnsafe;
 873                         }
 874                 }
 875
 876                 public bool IsStatic {
 877                         get {
 878                                 return (ModFlags & Modifiers.STATIC) != 0;
 879                         }
 880                 }
 881
 882                 #endregion
 883         }
 884
 885         //
 886         // Base member specification. A member specification contains
 887         // member details which can alter in the context (e.g. generic instances)
 888         //
 889         public abstract class MemberSpec
 890         {
 891                 [Flags]
 892                 protected enum StateFlags
 893                 {
 894                         Obsolete_Undetected = 1,        // Obsolete attribute has not been detected yet
 895                         Obsolete = 1 << 1,                      // Member has obsolete attribute
 896                         CLSCompliant_Undetected = 1 << 3,       // CLSCompliant attribute has not been detected yet
 897                         CLSCompliant = 1 << 4,          // Member is CLS Compliant
 898
 899                         IsAccessor = 1 << 9,            // Method is an accessor
 900                         IsGeneric = 1 << 10,            // Member contains type arguments
 901
 902                         PendingMetaInflate = 1 << 12,
 903                         PendingMakeMethod = 1 << 13,
 904                         PendingMemberCacheMembers = 1 << 14,
 905                         PendingBaseTypeInflate = 1 << 15,
 906                         InterfacesExpanded = 1 << 16,
 907                         IsNotRealProperty = 1 << 17,
 908                 }
 909
 910                 protected Modifiers modifiers;
 911                 protected StateFlags state;
 912                 protected IMemberDefinition definition;
 913                 public readonly MemberKind Kind;
 914                 protected TypeSpec declaringType;
 915
 916 #if DEBUG
 917                 static int counter;
 918                 public int ID = counter++;
 919 #endif
 920
 921                 protected MemberSpec (MemberKind kind, TypeSpec declaringType, IMemberDefinition definition, Modifiers modifiers)
 922                 {
 923                         this.Kind = kind;
 924                         this.declaringType = declaringType;
 925                         this.definition = definition;
 926                         this.modifiers = modifiers;
 927
 928                         state = StateFlags.Obsolete_Undetected | StateFlags.CLSCompliant_Undetected;
 929                 }
 930
 931                 #region Properties
 932
 933                 public Assembly Assembly {
 934                         get {
 935                                 return definition.Assembly;
 936                         }
 937                 }
 938
 939                 public virtual int Arity {
 940                         get {
 941                                 return 0;
 942                         }
 943                 }
 944
 945                 public TypeSpec DeclaringType {
 946                         get {
 947                                 return declaringType;
 948                         }
 949                         set {
 950                                 declaringType = value;
 951                         }
 952                 }
 953
 954                 public IMemberDefinition MemberDefinition {
 955                         get {
 956                                 return definition;
 957                         }
 958                 }
 959
 960                 public Modifiers Modifiers {
 961                         get {
 962                                 return modifiers;
 963                         }
 964                         set {
 965                                 modifiers = value;
 966                         }
 967                 }
 968
 969                 public virtual string Name {
 970                         get {
 971                                 return definition.Name;
 972                         }
 973                 }
 974
 975                 public bool IsAbstract {
 976                         get { return (modifiers & Modifiers.ABSTRACT) != 0; }
 977                 }
 978
 979                 public bool IsAccessor {
 980                         get {
 981                                 return (state & StateFlags.IsAccessor) != 0;
 982                         }
 983                         set {
 984                                 state = value ? state | StateFlags.IsAccessor : state & ~StateFlags.IsAccessor;
 985                         }
 986                 }
 987
 988                 //
 989                 // Return true when this member is a generic in C# terms
 990                 // A nested non-generic type of generic type will return false
 991                 //
 992                 public bool IsGeneric {
 993                         get {
 994                                 return (state & StateFlags.IsGeneric) != 0;
 995                         }
 996                         set {
 997                                 state = value ? state | StateFlags.IsGeneric : state & ~StateFlags.IsGeneric;
 998                         }
 999                 }
1000
1001                 public bool IsPrivate {
1002                         get { return (modifiers & Modifiers.PRIVATE) != 0; }
1003                 }
1004
1005                 public bool IsPublic {
1006                         get { return (modifiers & Modifiers.PUBLIC) != 0; }
1007                 }
1008
1009                 public bool IsStatic {
1010                         get {
1011                                 return (modifiers & Modifiers.STATIC) != 0;
1012                         }
1013                 }
1014
1015                 #endregion
1016
1017                 public virtual ObsoleteAttribute GetAttributeObsolete ()
1018                 {
1019                         if ((state & (StateFlags.Obsolete | StateFlags.Obsolete_Undetected)) == 0)
1020                                 return null;
1021
1022                         state &= ~StateFlags.Obsolete_Undetected;
1023
1024                         var oa = definition.GetAttributeObsolete ();
1025                         if (oa != null)
1026                                 state |= StateFlags.Obsolete;
1027
1028                         return oa;
1029                 }
1030
1031                 protected virtual bool IsNotCLSCompliant ()
1032                 {
1033                         return MemberDefinition.IsNotCLSCompliant ();
1034                 }
1035
1036                 public virtual string GetSignatureForError ()
1037                 {
1038                         var bf = MemberDefinition as Property.BackingField;
1039                         var name = bf == null ? Name : bf.OriginalName;
1040                         return DeclaringType.GetSignatureForError () + "." + name;
1041                 }
1042
1043                 public virtual MemberSpec InflateMember (TypeParameterInflator inflator)
1044                 {
1045                         var inflated = (MemberSpec) MemberwiseClone ();
1046                         inflated.declaringType = inflator.TypeInstance;
1047                         inflated.state |= StateFlags.PendingMetaInflate;
1048 #if DEBUG
1049                         if (inflated.ID > 0)
1050                                 inflated.ID = -inflated.ID;
1051 #endif
1052                         return inflated;
1053                 }
1054
1055                 //
1056                 // Is this member accessible from invocationType
1057                 //
1058                 public bool IsAccessible (TypeSpec invocationType)
1059                 {
1060                         var ma = Modifiers & Modifiers.AccessibilityMask;
1061                         if (ma == Modifiers.PUBLIC)
1062                                 return true;
1063
1064                         var parentType = /* this as TypeSpec ?? */ DeclaringType;
1065
1066                         //
1067                         // If only accessible to the current class or children
1068                         //
1069                         if (ma == Modifiers.PRIVATE)
1070                                 return invocationType.MemberDefinition == parentType.MemberDefinition ||
1071                                         TypeManager.IsNestedChildOf (invocationType, parentType);
1072
1073                         if ((ma & Modifiers.INTERNAL) != 0) {
1074                                 var b = TypeManager.IsThisOrFriendAssembly (invocationType == InternalType.FakeInternalType ?
1075                                          CodeGen.Assembly.Builder : invocationType.Assembly, Assembly);
1076                                 if (b || ma == Modifiers.INTERNAL)
1077                                         return b;
1078                         }
1079
1080                         // PROTECTED
1081                         if (!TypeManager.IsNestedFamilyAccessible (invocationType, parentType))
1082                                 return false;
1083
1084                         return true;
1085                 }
1086
1087                 //
1088                 // Returns member CLS compliance based on full member hierarchy
1089                 //
1090                 public bool IsCLSCompliant ()
1091                 {
1092                         if ((state & StateFlags.CLSCompliant_Undetected) != 0) {
1093                                 state &= ~StateFlags.CLSCompliant_Undetected;
1094
1095                                 if (IsNotCLSCompliant ())
1096                                         return false;
1097
1098                                 bool compliant;
1099                                 if (DeclaringType != null) {
1100                                         compliant = DeclaringType.IsCLSCompliant ();
1101                                 } else {
1102                                         // TODO: NEED AssemblySpec
1103                                         if (MemberDefinition.IsImported) {
1104                                                 var attr = MemberDefinition.Assembly.GetCustomAttributes (typeof (CLSCompliantAttribute), false);
1105                                                 compliant = attr.Length > 0 && ((CLSCompliantAttribute) attr[0]).IsCompliant;
1106                                         } else {
1107                                                 compliant = CodeGen.Assembly.IsClsCompliant;
1108                                         }
1109                                 }
1110
1111                                 if (compliant)
1112                                         state |= StateFlags.CLSCompliant;
1113                         }
1114
1115                         return (state & StateFlags.CLSCompliant) != 0;
1116                 }
1117
1118                 public bool IsConditionallyExcluded (Location loc)
1119                 {
1120                         if ((Kind & (MemberKind.Class | MemberKind.Method)) == 0)
1121                                 return false;
1122
1123                         var conditions = MemberDefinition.ConditionalConditions ();
1124                         if (conditions == null)
1125                                 return false;
1126
1127                         foreach (var condition in conditions) {
1128                                 if (loc.CompilationUnit.IsConditionalDefined (condition))
1129                                         return false;
1130                         }
1131
1132                         return true;
1133                 }
1134
1135                 public override string ToString ()
1136                 {
1137                         return GetSignatureForError ();
1138                 }
1139         }
1140
1141         //
1142         // Member details which are same between all member
1143         // specifications
1144         //
1145         public interface IMemberDefinition
1146         {
1147                 Assembly Assembly { get; }
1148                 string Name { get; }
1149                 bool IsImported { get; }
1150
1151                 string[] ConditionalConditions ();
1152                 ObsoleteAttribute GetAttributeObsolete ();
1153                 bool IsNotCLSCompliant ();
1154                 void SetIsAssigned ();
1155                 void SetIsUsed ();
1156         }
1157
1158         public interface IParametersMember : IInterfaceMemberSpec
1159         {
1160                 AParametersCollection Parameters { get; }
1161         }
1162
1163         public interface IInterfaceMemberSpec
1164         {
1165                 TypeSpec MemberType { get; }
1166         }
1167
1168         //
1169         // Base type container declaration. It exists to handle partial types
1170         // which share same definition (PartialContainer) but have different
1171         // resolve scopes
1172         //
1173         public abstract class DeclSpace : MemberCore {
1174                 /// <summary>
1175                 ///   This points to the actual definition that is being
1176                 ///   created with System.Reflection.Emit
1177                 /// </summary>
1178                 public TypeBuilder TypeBuilder;
1179
1180                 //
1181                 // This is the namespace in which this typecontainer
1182                 // was declared.  We use this to resolve names.
1183                 //
1184                 public NamespaceEntry NamespaceEntry;
1185
1186                 private Dictionary<string, FullNamedExpression> Cache = new Dictionary<string, FullNamedExpression> ();
1187
1188                 public readonly string Basename;
1189
1190                 protected Dictionary<string, MemberCore> defined_names;
1191
1192                 public TypeContainer PartialContainer;
1193
1194                 protected readonly bool is_generic;
1195                 readonly int count_type_params;
1196                 protected TypeParameter[] type_params;
1197                 TypeParameter[] type_param_list;
1198
1199                 //
1200                 // Whether we are Generic
1201                 //
1202                 public bool IsGeneric {
1203                         get {
1204                                 if (is_generic)
1205                                         return true;
1206                                 else if (Parent != null)
1207                                         return Parent.IsGeneric;
1208                                 else
1209                                         return false;
1210                         }
1211                 }
1212
1213                 static string[] attribute_targets = new string [] { "type" };
1214
1215                 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
1216                                   Attributes attrs)
1217                         : base (parent, name, attrs)
1218                 {
1219                         NamespaceEntry = ns;
1220                         Basename = name.Basename;
1221                         defined_names = new Dictionary<string, MemberCore> ();
1222                         PartialContainer = null;
1223                         if (name.TypeArguments != null) {
1224                                 is_generic = true;
1225                                 count_type_params = name.TypeArguments.Count;
1226                         }
1227                         if (parent != null)
1228                                 count_type_params += parent.count_type_params;
1229                 }
1230
1231                 /// <summary>
1232                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
1233                 /// </summary>
1234                 protected virtual bool AddToContainer (MemberCore symbol, string name)
1235                 {
1236                         MemberCore mc;
1237                         if (!defined_names.TryGetValue (name, out mc)) {
1238                                 defined_names.Add (name, symbol);
1239                                 return true;
1240                         }
1241
1242                         if (((mc.ModFlags | symbol.ModFlags) & Modifiers.COMPILER_GENERATED) != 0)
1243                                 return true;
1244
1245                         if (symbol.EnableOverloadChecks (mc))
1246                                 return true;
1247
1248                         InterfaceMemberBase im = mc as InterfaceMemberBase;
1249                         if (im != null && im.IsExplicitImpl)
1250                                 return true;
1251
1252                         Report.SymbolRelatedToPreviousError (mc);
1253                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
1254                                 Error_MissingPartialModifier (symbol);
1255                                 return false;
1256                         }
1257
1258                         if (this is ModuleContainer) {
1259                                 Report.Error (101, symbol.Location,
1260                                         "The namespace `{0}' already contains a definition for `{1}'",
1261                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
1262                         } else if (symbol is TypeParameter) {
1263                                 Report.Error (692, symbol.Location,
1264                                         "Duplicate type parameter `{0}'", symbol.GetSignatureForError ());
1265                         } else {
1266                                 Report.Error (102, symbol.Location,
1267                                               "The type `{0}' already contains a definition for `{1}'",
1268                                               GetSignatureForError (), symbol.MemberName.Name);
1269                         }
1270
1271                         return false;
1272                 }
1273
1274                 protected void RemoveFromContainer (string name)
1275                 {
1276                         defined_names.Remove (name);
1277                 }
1278
1279                 /// <summary>
1280                 ///   Returns the MemberCore associated with a given name in the declaration
1281                 ///   space. It doesn't return method based symbols !!
1282                 /// </summary>
1283                 ///
1284                 public MemberCore GetDefinition (string name)
1285                 {
1286                         MemberCore mc = null;
1287                         defined_names.TryGetValue (name, out mc);
1288                         return mc;
1289                 }
1290
1291                 //
1292                 // root_types contains all the types.  All TopLevel types
1293                 // hence have a parent that points to `root_types', that is
1294                 // why there is a non-obvious test down here.
1295                 //
1296                 public bool IsTopLevel {
1297                         get { return (Parent != null && Parent.Parent == null); }
1298                 }
1299
1300                 public virtual bool IsUnmanagedType ()
1301                 {
1302                         return false;
1303                 }
1304
1305                 protected virtual TypeAttributes TypeAttr {
1306                         get { return Module.DefaultCharSetType; }
1307                 }
1308
1309                 /// <remarks>
1310                 ///  Should be overriten by the appropriate declaration space
1311                 /// </remarks>
1312                 public abstract TypeBuilder DefineType ();
1313
1314                 protected void Error_MissingPartialModifier (MemberCore type)
1315                 {
1316                         Report.Error (260, type.Location,
1317                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
1318                                 type.GetSignatureForError ());
1319                 }
1320
1321                 public override string GetSignatureForError ()
1322                 {
1323                         return MemberName.GetSignatureForError ();
1324                 }
1325
1326                 public bool CheckAccessLevel (TypeSpec check_type)
1327                 {
1328 // TODO: Use this instead
1329 //                      return PartialContainer.Definition.IsAccessible (check_type);
1330
1331                         TypeSpec tb = PartialContainer.Definition;
1332                         check_type = check_type.GetDefinition ();
1333
1334                         var check_attr = check_type.Modifiers & Modifiers.AccessibilityMask;
1335
1336                         switch (check_attr){
1337                         case Modifiers.PUBLIC:
1338                                 return true;
1339
1340                         case Modifiers.INTERNAL:
1341                                 return TypeManager.IsThisOrFriendAssembly (Assembly, check_type.Assembly);
1342
1343                         case Modifiers.PRIVATE:
1344                                 TypeSpec declaring = check_type.DeclaringType;
1345                                 return tb == declaring.GetDefinition () || TypeManager.IsNestedChildOf (tb, declaring);
1346
1347                         case Modifiers.PROTECTED:
1348                                 //
1349                                 // Only accessible to methods in current type or any subtypes
1350                                 //
1351                                 return TypeManager.IsNestedFamilyAccessible (tb, check_type.DeclaringType);
1352
1353                         case Modifiers.PROTECTED | Modifiers.INTERNAL:
1354                                 if (TypeManager.IsThisOrFriendAssembly (Assembly, check_type.Assembly))
1355                                         return true;
1356
1357                                 goto case Modifiers.PROTECTED;
1358                         }
1359
1360                         throw new NotImplementedException (check_attr.ToString ());
1361                 }
1362
1363                 private TypeSpec LookupNestedTypeInHierarchy (string name, int arity)
1364                 {
1365                         // TODO: GenericMethod only
1366                         if (PartialContainer == null)
1367                                 return null;
1368
1369                         // Has any nested type
1370                         // Does not work, because base type can have
1371                         //if (PartialContainer.Types == null)
1372                         //      return null;
1373
1374                         var container = PartialContainer.CurrentType;
1375
1376                         // Is not Root container
1377                         if (container == null)
1378                                 return null;
1379
1380                         var     t = MemberCache.FindNestedType (container, name, arity);
1381                         if (t == null)
1382                                 return null;
1383
1384                         // FIXME: Breaks error reporting
1385                         if (!t.IsAccessible (CurrentType))
1386                                 return null;
1387
1388                         return t;
1389                 }
1390
1391                 //
1392                 // Public function used to locate types.
1393                 //
1394                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1395                 //
1396                 // Returns: Type or null if they type can not be found.
1397                 //
1398                 public override FullNamedExpression LookupNamespaceOrType (string name, int arity, Location loc, bool ignore_cs0104)
1399                 {
1400                         FullNamedExpression e;
1401                         if (arity == 0 && Cache.TryGetValue (name, out e))
1402                                 return e;
1403
1404                         e = null;
1405                         int errors = Report.Errors;
1406
1407                         if (arity == 0) {
1408                                 TypeParameter[] tp = CurrentTypeParameters;
1409                                 if (tp != null) {
1410                                         TypeParameter tparam = TypeParameter.FindTypeParameter (tp, name);
1411                                         if (tparam != null)
1412                                                 e = new TypeParameterExpr (tparam, Location.Null);
1413                                 }
1414                         }
1415
1416                         if (e == null) {
1417                                 TypeSpec t = LookupNestedTypeInHierarchy (name, arity);
1418
1419                                 if (t != null)
1420                                         e = new TypeExpression (t, Location.Null);
1421                                 else if (Parent != null)
1422                                         e = Parent.LookupNamespaceOrType (name, arity, loc, ignore_cs0104);
1423                                 else
1424                                         e = NamespaceEntry.LookupNamespaceOrType (name, arity, loc, ignore_cs0104);
1425                         }
1426
1427                         // TODO MemberCache: How to cache arity stuff ?
1428                         if (errors == Report.Errors && arity == 0)
1429                                 Cache [name] = e;
1430
1431                         return e;
1432                 }
1433
1434                 public override Assembly Assembly {
1435                         get { return Module.Assembly; }
1436                 }
1437
1438                 public virtual ModuleContainer Module {
1439                         get { return Parent.Module; }
1440                 }
1441
1442                 TypeParameter[] initialize_type_params ()
1443                 {
1444                         if (type_param_list != null)
1445                                 return type_param_list;
1446
1447                         DeclSpace the_parent = Parent;
1448                         if (this is GenericMethod)
1449                                 the_parent = null;
1450
1451                         var list = new List<TypeParameter> ();
1452                         if (the_parent != null && the_parent.IsGeneric) {
1453                                 // FIXME: move generics info out of DeclSpace
1454                                 TypeParameter[] parent_params = the_parent.TypeParameters;
1455                                 list.AddRange (parent_params);
1456                         }
1457
1458                         int count = type_params != null ? type_params.Length : 0;
1459                         for (int i = 0; i < count; i++) {
1460                                 TypeParameter param = type_params [i];
1461                                 list.Add (param);
1462                                 if (Parent.CurrentTypeParameters != null) {
1463                                         foreach (TypeParameter tp in Parent.CurrentTypeParameters) {
1464                                                 if (tp.Name != param.Name)
1465                                                         continue;
1466
1467                                                 Report.SymbolRelatedToPreviousError (tp.Location, null);
1468                                                 Report.Warning (693, 3, param.Location,
1469                                                         "Type parameter `{0}' has the same name as the type parameter from outer type `{1}'",
1470                                                         param.Name, Parent.GetSignatureForError ());
1471                                         }
1472                                 }
1473                         }
1474
1475                         type_param_list = new TypeParameter [list.Count];
1476                         list.CopyTo (type_param_list, 0);
1477                         return type_param_list;
1478                 }
1479
1480                 public virtual void SetParameterInfo (List<Constraints> constraints_list)
1481                 {
1482                         if (!is_generic) {
1483                                 if (constraints_list != null) {
1484                                         Report.Error (
1485                                                 80, Location, "Constraints are not allowed " +
1486                                                 "on non-generic declarations");
1487                                 }
1488
1489                                 return;
1490                         }
1491
1492                         TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1493                         type_params = new TypeParameter [names.Length];
1494
1495                         //
1496                         // Register all the names
1497                         //
1498                         for (int i = 0; i < type_params.Length; i++) {
1499                                 TypeParameterName name = names [i];
1500
1501                                 Constraints constraints = null;
1502                                 if (constraints_list != null) {
1503                                         int total = constraints_list.Count;
1504                                         for (int ii = 0; ii < total; ++ii) {
1505                                                 Constraints constraints_at = (Constraints)constraints_list[ii];
1506                                                 // TODO: it is used by iterators only
1507                                                 if (constraints_at == null) {
1508                                                         constraints_list.RemoveAt (ii);
1509                                                         --total;
1510                                                         continue;
1511                                                 }
1512                                                 if (constraints_at.TypeParameter.Value == name.Name) {
1513                                                         constraints = constraints_at;
1514                                                         constraints_list.RemoveAt(ii);
1515                                                         break;
1516                                                 }
1517                                         }
1518                                 }
1519
1520                                 Variance variance = name.Variance;
1521                                 if (name.Variance != Variance.None && !(this is Delegate || this is Interface)) {
1522                                         Report.Error (1960, name.Location, "Variant type parameters can only be used with interfaces and delegates");
1523                                         variance = Variance.None;
1524                                 }
1525
1526                                 type_params [i] = new TypeParameter (
1527                                         Parent, i, new MemberName (name.Name, Location), constraints, name.OptAttributes, variance);
1528
1529                                 AddToContainer (type_params [i], name.Name);
1530                         }
1531
1532                         if (constraints_list != null && constraints_list.Count > 0) {
1533                                 foreach (Constraints constraint in constraints_list) {
1534                                         Report.Error(699, constraint.Location, "`{0}': A constraint references nonexistent type parameter `{1}'",
1535                                                 GetSignatureForError (), constraint.TypeParameter.Value);
1536                                 }
1537                         }
1538                 }
1539
1540                 protected TypeParameter[] TypeParameters {
1541                         get {
1542                                 if (!IsGeneric)
1543                                         throw new InvalidOperationException ();
1544                                 if ((PartialContainer != null) && (PartialContainer != this))
1545                                         return PartialContainer.TypeParameters;
1546                                 if (type_param_list == null)
1547                                         initialize_type_params ();
1548
1549                                 return type_param_list;
1550                         }
1551                 }
1552
1553                 public int CountTypeParameters {
1554                         get {
1555                                 return count_type_params;
1556                         }
1557                 }
1558
1559                 public override string[] ValidAttributeTargets {
1560                         get { return attribute_targets; }
1561                 }
1562
1563                 protected override bool VerifyClsCompliance ()
1564                 {
1565                         if (!base.VerifyClsCompliance ()) {
1566                                 return false;
1567                         }
1568
1569                         if (type_params != null) {
1570                                 foreach (TypeParameter tp in type_params) {
1571                                         tp.VerifyClsCompliance ();
1572                                 }
1573                         }
1574
1575                         return true;
1576                 }
1577         }
1578 }