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.Collections.Generic;
  16 using System.Reflection.Emit;
  17 using System.Reflection;
  18
  19 #if NET_2_1
  20 using XmlElement = System.Object;
  21 #else
  22 using System.Xml;
  23 #endif
  24
  25 namespace Mono.CSharp {
  26
  27         //
  28         // Better name would be DottenName
  29         //
  30         public class MemberName {
  31                 public readonly string Name;
  32                 public TypeArguments TypeArguments;
  33
  34                 public readonly MemberName Left;
  35                 public readonly Location Location;
  36
  37                 public static readonly MemberName Null = new MemberName ("");
  38
  39                 bool is_double_colon;
  40
  41                 private MemberName (MemberName left, string name, bool is_double_colon,
  42                                     Location loc)
  43                 {
  44                         this.Name = name;
  45                         this.Location = loc;
  46                         this.is_double_colon = is_double_colon;
  47                         this.Left = left;
  48                 }
  49
  50                 private MemberName (MemberName left, string name, bool is_double_colon,
  51                                     TypeArguments args, Location loc)
  52                         : this (left, name, is_double_colon, loc)
  53                 {
  54                         if (args != null && args.Count > 0)
  55                                 this.TypeArguments = args;
  56                 }
  57
  58                 public MemberName (string name)
  59                         : this (name, Location.Null)
  60                 { }
  61
  62                 public MemberName (string name, Location loc)
  63                         : this (null, name, false, loc)
  64                 { }
  65
  66                 public MemberName (string name, TypeArguments args, Location loc)
  67                         : this (null, name, false, args, loc)
  68                 { }
  69
  70                 public MemberName (MemberName left, string name)
  71                         : this (left, name, left != null ? left.Location : Location.Null)
  72                 { }
  73
  74                 public MemberName (MemberName left, string name, Location loc)
  75                         : this (left, name, false, loc)
  76                 { }
  77
  78                 public MemberName (MemberName left, string name, TypeArguments args, Location loc)
  79                         : this (left, name, false, args, loc)
  80                 { }
  81
  82                 public MemberName (string alias, string name, TypeArguments args, Location loc)
  83                         : this (new MemberName (alias, loc), name, true, args, loc)
  84                 { }
  85
  86                 public MemberName (MemberName left, MemberName right)
  87                         : this (left, right, right.Location)
  88                 { }
  89
  90                 public MemberName (MemberName left, MemberName right, Location loc)
  91                         : this (null, right.Name, false, right.TypeArguments, loc)
  92                 {
  93                         if (right.is_double_colon)
  94                                 throw new InternalErrorException ("Cannot append double_colon member name");
  95                         this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  96                 }
  97
  98                 // TODO: Remove
  99                 public string GetName ()
 100                 {
 101                         return GetName (false);
 102                 }
 103
 104                 public int Arity {
 105                         get {
 106                                 return TypeArguments == null ? 0 : TypeArguments.Count;
 107                         }
 108                 }
 109
 110                 public bool IsGeneric {
 111                         get {
 112                                 if (TypeArguments != null)
 113                                         return true;
 114                                 else if (Left != null)
 115                                         return Left.IsGeneric;
 116                                 else
 117                                         return false;
 118                         }
 119                 }
 120
 121                 public string GetName (bool is_generic)
 122                 {
 123                         string name = is_generic ? Basename : Name;
 124                         if (Left != null)
 125                                 return Left.GetName (is_generic) + (is_double_colon ? "::" : ".") + name;
 126
 127                         return name;
 128                 }
 129
 130                 public ATypeNameExpression GetTypeExpression ()
 131                 {
 132                         if (Left == null) {
 133                                 if (TypeArguments != null)
 134                                         return new SimpleName (Name, TypeArguments, Location);
 135
 136                                 return new SimpleName (Name, Location);
 137                         }
 138
 139                         if (is_double_colon) {
 140                                 if (Left.Left != null)
 141                                         throw new InternalErrorException ("The left side of a :: should be an identifier");
 142                                 return new QualifiedAliasMember (Left.Name, Name, TypeArguments, Location);
 143                         }
 144
 145                         Expression lexpr = Left.GetTypeExpression ();
 146                         return new MemberAccess (lexpr, Name, TypeArguments, Location);
 147                 }
 148
 149                 public MemberName Clone ()
 150                 {
 151                         MemberName left_clone = Left == null ? null : Left.Clone ();
 152                         return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
 153                 }
 154
 155                 public string Basename {
 156                         get {
 157                                 if (TypeArguments != null)
 158                                         return MakeName (Name, TypeArguments);
 159                                 return Name;
 160                         }
 161                 }
 162
 163                 public string GetSignatureForError ()
 164                 {
 165                         string append = TypeArguments == null ? "" : "<" + TypeArguments.GetSignatureForError () + ">";
 166                         if (Left == null)
 167                                 return Name + append;
 168                         string connect = is_double_colon ? "::" : ".";
 169                         return Left.GetSignatureForError () + connect + Name + append;
 170                 }
 171
 172                 public override bool Equals (object other)
 173                 {
 174                         return Equals (other as MemberName);
 175                 }
 176
 177                 public bool Equals (MemberName other)
 178                 {
 179                         if (this == other)
 180                                 return true;
 181                         if (other == null || Name != other.Name)
 182                                 return false;
 183                         if (is_double_colon != other.is_double_colon)
 184                                 return false;
 185
 186                         if ((TypeArguments != null) &&
 187                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 188                                 return false;
 189
 190                         if ((TypeArguments == null) && (other.TypeArguments != null))
 191                                 return false;
 192
 193                         if (Left == null)
 194                                 return other.Left == null;
 195
 196                         return Left.Equals (other.Left);
 197                 }
 198
 199                 public override int GetHashCode ()
 200                 {
 201                         int hash = Name.GetHashCode ();
 202                         for (MemberName n = Left; n != null; n = n.Left)
 203                                 hash ^= n.Name.GetHashCode ();
 204                         if (is_double_colon)
 205                                 hash ^= 0xbadc01d;
 206
 207                         if (TypeArguments != null)
 208                                 hash ^= TypeArguments.Count << 5;
 209
 210                         return hash & 0x7FFFFFFF;
 211                 }
 212
 213                 public int CountTypeArguments {
 214                         get {
 215                                 if (TypeArguments != null)
 216                                         return TypeArguments.Count;
 217                                 else if (Left != null)
 218                                         return Left.CountTypeArguments;
 219                                 else
 220                                         return 0;
 221                         }
 222                 }
 223
 224                 public static string MakeName (string name, TypeArguments args)
 225                 {
 226                         if (args == null)
 227                                 return name;
 228
 229                         return name + "`" + args.Count;
 230                 }
 231
 232                 public static string MakeName (string name, int count)
 233                 {
 234                         return name + "`" + count;
 235                 }
 236         }
 237
 238         public class SimpleMemberName
 239         {
 240                 public string Value;
 241                 public Location Location;
 242
 243                 public SimpleMemberName (string name, Location loc)
 244                 {
 245                         this.Value = name;
 246                         this.Location = loc;
 247                 }
 248         }
 249
 250         /// <summary>
 251         ///   Base representation for members.  This is used to keep track
 252         ///   of Name, Location and Modifier flags, and handling Attributes.
 253         /// </summary>
 254         [System.Diagnostics.DebuggerDisplay ("{GetSignatureForError()}")]
 255         public abstract class MemberCore : Attributable, IMemberContext, IMemberDefinition
 256         {
 257                 /// <summary>
 258                 ///   Public name
 259                 /// </summary>
 260
 261                 protected string cached_name;
 262                 // TODO: Remove in favor of MemberName
 263                 public string Name {
 264                         get {
 265                                 if (cached_name == null)
 266                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 267                                 return cached_name;
 268                         }
 269                 }
 270
 271                 string IMemberDefinition.Name {
 272                         get {
 273                                 return member_name.Name;
 274                         }
 275                 }
 276
 277                 // Is not readonly because of IndexerName attribute
 278                 private MemberName member_name;
 279                 public MemberName MemberName {
 280                         get { return member_name; }
 281                 }
 282
 283                 /// <summary>
 284                 ///   Modifier flags that the user specified in the source code
 285                 /// </summary>
 286                 private Modifiers mod_flags;
 287                 public Modifiers ModFlags {
 288                         set {
 289                                 mod_flags = value;
 290                                 if ((value & Modifiers.COMPILER_GENERATED) != 0)
 291                                         caching_flags = Flags.IsUsed | Flags.IsAssigned;
 292                         }
 293                         get {
 294                                 return mod_flags;
 295                         }
 296                 }
 297
 298                 public virtual ModuleContainer Module {
 299                         get {
 300                                 return Parent.Module;
 301                         }
 302                 }
 303
 304                 public /*readonly*/ TypeContainer Parent;
 305
 306                 /// <summary>
 307                 ///   Location where this declaration happens
 308                 /// </summary>
 309                 public Location Location {
 310                         get { return member_name.Location; }
 311                 }
 312
 313                 /// <summary>
 314                 ///   XML documentation comment
 315                 /// </summary>
 316                 protected string comment;
 317
 318                 /// <summary>
 319                 ///   Represents header string for documentation comment
 320                 ///   for each member types.
 321                 /// </summary>
 322                 public abstract string DocCommentHeader { get; }
 323
 324                 [Flags]
 325                 public enum Flags {
 326                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 327                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 328                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 329                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 330                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 331                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 332                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 333                         ClsCompliantAttributeFalse = 1 << 7,                    // Member has CLSCompliant(false)
 334                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 335                         Excluded = 1 << 9,                                      // Method is conditional
 336                         MethodOverloadsExist = 1 << 10,         // Test for duplication must be performed
 337                         IsUsed = 1 << 11,
 338                         IsAssigned = 1 << 12,                           // Field is assigned
 339                         HasExplicitLayout       = 1 << 13,
 340                         PartialDefinitionExists = 1 << 14,      // Set when corresponding partial method definition exists
 341                         HasStructLayout         = 1 << 15                       // Has StructLayoutAttribute
 342                 }
 343
 344                 /// <summary>
 345                 ///   MemberCore flags at first detected then cached
 346                 /// </summary>
 347                 internal Flags caching_flags;
 348
 349                 public MemberCore (DeclSpace parent, MemberName name, Attributes attrs)
 350                 {
 351                         this.Parent = parent as TypeContainer;
 352                         member_name = name;
 353                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 354                         AddAttributes (attrs, this);
 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 = p.MemberDefinition.IsInternalAsPublic (mc.Module.DeclaringAssembly);
 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 = p.MemberDefinition.IsInternalAsPublic (mc.Module.DeclaringAssembly);
 601                                                 else if (al == (Modifiers.PROTECTED | Modifiers.INTERNAL))
 602                                                         same_access_restrictions = mc.Parent.IsBaseTypeDefinition (p_parent) && p.MemberDefinition.IsInternalAsPublic (mc.Module.DeclaringAssembly);
 603                                                 else
 604                                                         goto case Modifiers.PROTECTED;
 605
 606                                                 break;
 607
 608                                         case Modifiers.PRIVATE:
 609                                                 //
 610                                                 // Both are private and share same parent
 611                                                 //
 612                                                 if (al == Modifiers.PRIVATE) {
 613                                                         var decl = mc.Parent;
 614                                                         do {
 615                                                                 same_access_restrictions = decl.CurrentType == p_parent;
 616                                                         } while (!same_access_restrictions && !decl.IsTopLevel && (decl = decl.Parent) != null);
 617                                                 }
 618
 619                                                 break;
 620
 621                                         default:
 622                                                 throw new InternalErrorException (al.ToString ());
 623                                         }
 624                                 }
 625
 626                                 if (!same_access_restrictions)
 627                                         return false;
 628                         }
 629
 630                         return true;
 631                 }
 632
 633                 /// <summary>
 634                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 635                 /// </summary>
 636                 public override bool IsClsComplianceRequired ()
 637                 {
 638                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 639                                 return (caching_flags & Flags.ClsCompliant) != 0;
 640
 641                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 642
 643                         if (HasClsCompliantAttribute) {
 644                                 if ((caching_flags & Flags.ClsCompliantAttributeFalse) != 0)
 645                                         return false;
 646
 647                                 caching_flags |= Flags.ClsCompliant;
 648                                 return true;
 649                         }
 650
 651                         if (Parent.PartialContainer.IsClsComplianceRequired ()) {
 652                                 caching_flags |= Flags.ClsCompliant;
 653                                 return true;
 654                         }
 655
 656                         return false;
 657                 }
 658
 659                 public virtual string[] ConditionalConditions ()
 660                 {
 661                         return null;
 662                 }
 663
 664                 /// <summary>
 665                 /// Returns true when MemberCore is exposed from assembly.
 666                 /// </summary>
 667                 public bool IsExposedFromAssembly ()
 668                 {
 669                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 670                                 return false;
 671
 672                         DeclSpace parentContainer = Parent.PartialContainer;
 673                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 674                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 675                                         return false;
 676                                 parentContainer = parentContainer.Parent;
 677                         }
 678                         return true;
 679                 }
 680
 681                 public virtual IList<MethodSpec> LookupExtensionMethod (TypeSpec extensionType, string name, int arity, ref NamespaceEntry scope)
 682                 {
 683                         return Parent.LookupExtensionMethod (extensionType, name, arity, ref scope);
 684                 }
 685
 686                 public virtual FullNamedExpression LookupNamespaceAlias (string name)
 687                 {
 688                         return Parent.NamespaceEntry.LookupNamespaceAlias (name);
 689                 }
 690
 691                 public virtual FullNamedExpression LookupNamespaceOrType (string name, int arity, Location loc, bool ignore_cs0104)
 692                 {
 693                         return Parent.LookupNamespaceOrType (name, arity, loc, ignore_cs0104);
 694                 }
 695
 696                 /// <summary>
 697                 /// Goes through class hierarchy and gets value of first found CLSCompliantAttribute.
 698                 /// If no is attribute exists then assembly CLSCompliantAttribute is returned.
 699                 /// </summary>
 700                 public bool IsNotCLSCompliant ()
 701                 {
 702                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 703                                 return (caching_flags & Flags.ClsCompliantAttributeFalse) != 0;
 704
 705                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 706
 707                         if (OptAttributes != null) {
 708                                 Attribute cls_attribute = OptAttributes.Search (Compiler.PredefinedAttributes.CLSCompliant);
 709                                 if (cls_attribute != null) {
 710                                         caching_flags |= Flags.HasClsCompliantAttribute;
 711                                         if (cls_attribute.GetClsCompliantAttributeValue ())
 712                                                 return false;
 713
 714                                         caching_flags |= Flags.ClsCompliantAttributeFalse;
 715                                         return true;
 716                                 }
 717                         }
 718
 719                         return false;
 720                 }
 721
 722                 /// <summary>
 723                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 724                 /// </summary>
 725                 protected bool HasClsCompliantAttribute {
 726                         get {
 727                                 if ((caching_flags & Flags.HasCompliantAttribute_Undetected) != 0)
 728                                         IsNotCLSCompliant ();
 729
 730                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 731                         }
 732                 }
 733
 734                 /// <summary>
 735                 /// Returns true when a member supports multiple overloads (methods, indexers, etc)
 736                 /// </summary>
 737                 public virtual bool EnableOverloadChecks (MemberCore overload)
 738                 {
 739                         return false;
 740                 }
 741
 742                 /// <summary>
 743                 /// The main virtual method for CLS-Compliant verifications.
 744                 /// The method returns true if member is CLS-Compliant and false if member is not
 745                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 746                 /// and add their extra verifications.
 747                 /// </summary>
 748                 protected virtual bool VerifyClsCompliance ()
 749                 {
 750                         if (HasClsCompliantAttribute) {
 751                                 if (!Module.DeclaringAssembly.HasCLSCompliantAttribute) {
 752                                         Attribute a = OptAttributes.Search (Compiler.PredefinedAttributes.CLSCompliant);
 753                                         if ((caching_flags & Flags.ClsCompliantAttributeFalse) != 0) {
 754                                                 Report.Warning (3021, 2, a.Location,
 755                                                         "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant",
 756                                                         GetSignatureForError ());
 757                                         } else {
 758                                                 Report.Warning (3014, 1, a.Location,
 759                                                         "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 760                                                         GetSignatureForError ());
 761                                         }
 762                                         return false;
 763                                 }
 764
 765                                 if (!IsExposedFromAssembly ()) {
 766                                         Attribute a = OptAttributes.Search (Compiler.PredefinedAttributes.CLSCompliant);
 767                                         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 ());
 768                                         return false;
 769                                 }
 770
 771                                 if ((caching_flags & Flags.ClsCompliantAttributeFalse) != 0) {
 772                                         if (Parent.Kind == MemberKind.Interface && Parent.IsClsComplianceRequired ()) {
 773                                                 Report.Warning (3010, 1, Location, "`{0}': CLS-compliant interfaces must have only CLS-compliant members", GetSignatureForError ());
 774                                         } else if (Parent.Kind == MemberKind.Class && (ModFlags & Modifiers.ABSTRACT) != 0 && Parent.IsClsComplianceRequired ()) {
 775                                                 Report.Warning (3011, 1, Location, "`{0}': only CLS-compliant members can be abstract", GetSignatureForError ());
 776                                         }
 777
 778                                         return false;
 779                                 }
 780
 781                                 if (Parent.Parent != null && !Parent.IsClsComplianceRequired ()) {
 782                                         Attribute a = OptAttributes.Search (Compiler.PredefinedAttributes.CLSCompliant);
 783                                         Report.Warning (3018, 1, a.Location, "`{0}' cannot be marked as CLS-compliant because it is a member of non CLS-compliant type `{1}'",
 784                                                 GetSignatureForError (), Parent.GetSignatureForError ());
 785                                         return false;
 786                                 }
 787                         } else {
 788                                 if (!IsExposedFromAssembly ())
 789                                         return false;
 790
 791                                 if (!Parent.PartialContainer.IsClsComplianceRequired ())
 792                                         return false;
 793                         }
 794
 795                         if (member_name.Name [0] == '_') {
 796                                 Report.Warning (3008, 1, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 797                         }
 798
 799                         return true;
 800                 }
 801
 802                 //
 803                 // Raised (and passed an XmlElement that contains the comment)
 804                 // when GenerateDocComment is writing documentation expectedly.
 805                 //
 806                 internal virtual void OnGenerateDocComment (XmlElement intermediateNode)
 807                 {
 808                 }
 809
 810                 //
 811                 // Returns a string that represents the signature for this
 812                 // member which should be used in XML documentation.
 813                 //
 814                 public virtual string GetDocCommentName (DeclSpace ds)
 815                 {
 816                         if (ds == null || this is DeclSpace)
 817                                 return DocCommentHeader + Name;
 818                         else
 819                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 820                 }
 821
 822                 //
 823                 // Generates xml doc comments (if any), and if required,
 824                 // handle warning report.
 825                 //
 826                 internal virtual void GenerateDocComment (DeclSpace ds)
 827                 {
 828                         try {
 829                                 DocUtil.GenerateDocComment (this, ds, Report);
 830                         } catch (Exception e) {
 831                                 throw new InternalErrorException (this, e);
 832                         }
 833                 }
 834
 835                 #region IMemberContext Members
 836
 837                 public virtual CompilerContext Compiler {
 838                         get { return Parent.Compiler; }
 839                 }
 840
 841                 public virtual TypeSpec CurrentType {
 842                         get { return Parent.CurrentType; }
 843                 }
 844
 845                 public MemberCore CurrentMemberDefinition {
 846                         get { return this; }
 847                 }
 848
 849                 public virtual TypeParameter[] CurrentTypeParameters {
 850                         get { return null; }
 851                 }
 852
 853                 public virtual bool HasUnresolvedConstraints {
 854                         get { return false; }
 855                 }
 856
 857                 public bool IsObsolete {
 858                         get {
 859                                 if (GetAttributeObsolete () != null)
 860                                         return true;
 861
 862                                 return Parent == null ? false : Parent.IsObsolete;
 863                         }
 864                 }
 865
 866                 public bool IsUnsafe {
 867                         get {
 868                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 869                                         return true;
 870
 871                                 return Parent == null ? false : Parent.IsUnsafe;
 872                         }
 873                 }
 874
 875                 public bool IsStatic {
 876                         get {
 877                                 return (ModFlags & Modifiers.STATIC) != 0;
 878                         }
 879                 }
 880
 881                 #endregion
 882         }
 883
 884         //
 885         // Base member specification. A member specification contains
 886         // member details which can alter in the context (e.g. generic instances)
 887         //
 888         public abstract class MemberSpec
 889         {
 890                 [Flags]
 891                 public enum StateFlags
 892                 {
 893                         Obsolete_Undetected = 1,        // Obsolete attribute has not been detected yet
 894                         Obsolete = 1 << 1,                      // Member has obsolete attribute
 895                         CLSCompliant_Undetected = 1 << 3,       // CLSCompliant attribute has not been detected yet
 896                         CLSCompliant = 1 << 4,          // Member is CLS Compliant
 897                         HasDynamicElement = 1 << 5,
 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                 public 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 virtual int Arity {
 934                         get {
 935                                 return 0;
 936                         }
 937                 }
 938
 939                 public TypeSpec DeclaringType {
 940                         get {
 941                                 return declaringType;
 942                         }
 943                         set {
 944                                 declaringType = value;
 945                         }
 946                 }
 947
 948                 public IMemberDefinition MemberDefinition {
 949                         get {
 950                                 return definition;
 951                         }
 952                 }
 953
 954                 public Modifiers Modifiers {
 955                         get {
 956                                 return modifiers;
 957                         }
 958                         set {
 959                                 modifiers = value;
 960                         }
 961                 }
 962
 963                 public virtual string Name {
 964                         get {
 965                                 return definition.Name;
 966                         }
 967                 }
 968
 969                 public bool IsAbstract {
 970                         get { return (modifiers & Modifiers.ABSTRACT) != 0; }
 971                 }
 972
 973                 public bool IsAccessor {
 974                         get {
 975                                 return (state & StateFlags.IsAccessor) != 0;
 976                         }
 977                         set {
 978                                 state = value ? state | StateFlags.IsAccessor : state & ~StateFlags.IsAccessor;
 979                         }
 980                 }
 981
 982                 //
 983                 // Return true when this member is a generic in C# terms
 984                 // A nested non-generic type of generic type will return false
 985                 //
 986                 public bool IsGeneric {
 987                         get {
 988                                 return (state & StateFlags.IsGeneric) != 0;
 989                         }
 990                         set {
 991                                 state = value ? state | StateFlags.IsGeneric : state & ~StateFlags.IsGeneric;
 992                         }
 993                 }
 994
 995                 public bool IsPrivate {
 996                         get { return (modifiers & Modifiers.PRIVATE) != 0; }
 997                 }
 998
 999                 public bool IsPublic {
1000                         get { return (modifiers & Modifiers.PUBLIC) != 0; }
1001                 }
1002
1003                 public bool IsStatic {
1004                         get {
1005                                 return (modifiers & Modifiers.STATIC) != 0;
1006                         }
1007                 }
1008
1009                 #endregion
1010
1011                 public virtual ObsoleteAttribute GetAttributeObsolete ()
1012                 {
1013                         if ((state & (StateFlags.Obsolete | StateFlags.Obsolete_Undetected)) == 0)
1014                                 return null;
1015
1016                         state &= ~StateFlags.Obsolete_Undetected;
1017
1018                         var oa = definition.GetAttributeObsolete ();
1019                         if (oa != null)
1020                                 state |= StateFlags.Obsolete;
1021
1022                         return oa;
1023                 }
1024
1025                 protected virtual bool IsNotCLSCompliant ()
1026                 {
1027                         return MemberDefinition.IsNotCLSCompliant ();
1028                 }
1029
1030                 public virtual string GetSignatureForError ()
1031                 {
1032                         var bf = MemberDefinition as Property.BackingField;
1033                         var name = bf == null ? Name : bf.OriginalName;
1034                         return DeclaringType.GetSignatureForError () + "." + name;
1035                 }
1036
1037                 public virtual MemberSpec InflateMember (TypeParameterInflator inflator)
1038                 {
1039                         var inflated = (MemberSpec) MemberwiseClone ();
1040                         inflated.declaringType = inflator.TypeInstance;
1041                         inflated.state |= StateFlags.PendingMetaInflate;
1042 #if DEBUG
1043                         if (inflated.ID > 0)
1044                                 inflated.ID = -inflated.ID;
1045 #endif
1046                         return inflated;
1047                 }
1048
1049                 //
1050                 // Is this member accessible from invocationType
1051                 //
1052                 public bool IsAccessible (TypeSpec invocationType)
1053                 {
1054                         var ma = Modifiers & Modifiers.AccessibilityMask;
1055                         if (ma == Modifiers.PUBLIC)
1056                                 return true;
1057
1058                         var parentType = /* this as TypeSpec ?? */ DeclaringType;
1059
1060                         // It's null for module context
1061                         if (invocationType == null)
1062                                 invocationType = InternalType.FakeInternalType;
1063
1064                         //
1065                         // If only accessible to the current class or children
1066                         //
1067                         if (ma == Modifiers.PRIVATE)
1068                                 return invocationType.MemberDefinition == parentType.MemberDefinition ||
1069                                         TypeManager.IsNestedChildOf (invocationType, parentType);
1070
1071                         if ((ma & Modifiers.INTERNAL) != 0) {
1072                                 bool b;
1073                                 var assembly = invocationType == InternalType.FakeInternalType ?
1074                                         RootContext.ToplevelTypes.DeclaringAssembly :
1075                                         invocationType.MemberDefinition.DeclaringAssembly;
1076
1077                                 if (parentType == null) {
1078                                         b = ((ITypeDefinition) MemberDefinition).IsInternalAsPublic (assembly);
1079                                 } else {
1080                                         b = DeclaringType.MemberDefinition.IsInternalAsPublic (assembly);
1081                                 }
1082
1083                                 if (b || ma == Modifiers.INTERNAL)
1084                                         return b;
1085                         }
1086
1087                         // PROTECTED
1088                         if (!TypeManager.IsNestedFamilyAccessible (invocationType, parentType))
1089                                 return false;
1090
1091                         return true;
1092                 }
1093
1094                 //
1095                 // Returns member CLS compliance based on full member hierarchy
1096                 //
1097                 public bool IsCLSCompliant ()
1098                 {
1099                         if ((state & StateFlags.CLSCompliant_Undetected) != 0) {
1100                                 state &= ~StateFlags.CLSCompliant_Undetected;
1101
1102                                 if (IsNotCLSCompliant ())
1103                                         return false;
1104
1105                                 bool compliant;
1106                                 if (DeclaringType != null) {
1107                                         compliant = DeclaringType.IsCLSCompliant ();
1108                                 } else {
1109                                         compliant = ((ITypeDefinition) MemberDefinition).DeclaringAssembly.IsCLSCompliant;
1110                                 }
1111
1112                                 if (compliant)
1113                                         state |= StateFlags.CLSCompliant;
1114                         }
1115
1116                         return (state & StateFlags.CLSCompliant) != 0;
1117                 }
1118
1119                 public bool IsConditionallyExcluded (Location loc)
1120                 {
1121                         if ((Kind & (MemberKind.Class | MemberKind.Method)) == 0)
1122                                 return false;
1123
1124                         var conditions = MemberDefinition.ConditionalConditions ();
1125                         if (conditions == null)
1126                                 return false;
1127
1128                         foreach (var condition in conditions) {
1129                                 if (loc.CompilationUnit.IsConditionalDefined (condition))
1130                                         return false;
1131                         }
1132
1133                         return true;
1134                 }
1135
1136                 public override string ToString ()
1137                 {
1138                         return GetSignatureForError ();
1139                 }
1140         }
1141
1142         //
1143         // Member details which are same between all member
1144         // specifications
1145         //
1146         public interface IMemberDefinition
1147         {
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                 public readonly string Basename;
1187
1188                 protected Dictionary<string, MemberCore> defined_names;
1189
1190                 public TypeContainer PartialContainer;
1191
1192                 protected readonly bool is_generic;
1193                 readonly int count_type_params;
1194                 protected TypeParameter[] type_params;
1195                 TypeParameter[] type_param_list;
1196
1197                 //
1198                 // Whether we are Generic
1199                 //
1200                 public bool IsGeneric {
1201                         get {
1202                                 if (is_generic)
1203                                         return true;
1204                                 else if (Parent != null)
1205                                         return Parent.IsGeneric;
1206                                 else
1207                                         return false;
1208                         }
1209                 }
1210
1211                 static string[] attribute_targets = new string [] { "type" };
1212
1213                 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
1214                                   Attributes attrs)
1215                         : base (parent, name, attrs)
1216                 {
1217                         NamespaceEntry = ns;
1218                         Basename = name.Basename;
1219                         defined_names = new Dictionary<string, MemberCore> ();
1220                         PartialContainer = null;
1221                         if (name.TypeArguments != null) {
1222                                 is_generic = true;
1223                                 count_type_params = name.TypeArguments.Count;
1224                         }
1225                         if (parent != null)
1226                                 count_type_params += parent.count_type_params;
1227                 }
1228
1229                 /// <summary>
1230                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
1231                 /// </summary>
1232                 protected virtual bool AddToContainer (MemberCore symbol, string name)
1233                 {
1234                         MemberCore mc;
1235                         if (!defined_names.TryGetValue (name, out mc)) {
1236                                 defined_names.Add (name, symbol);
1237                                 return true;
1238                         }
1239
1240                         if (((mc.ModFlags | symbol.ModFlags) & Modifiers.COMPILER_GENERATED) != 0)
1241                                 return true;
1242
1243                         if (symbol.EnableOverloadChecks (mc))
1244                                 return true;
1245
1246                         InterfaceMemberBase im = mc as InterfaceMemberBase;
1247                         if (im != null && im.IsExplicitImpl)
1248                                 return true;
1249
1250                         Report.SymbolRelatedToPreviousError (mc);
1251                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
1252                                 Error_MissingPartialModifier (symbol);
1253                                 return false;
1254                         }
1255
1256                         if (this is ModuleContainer) {
1257                                 Report.Error (101, symbol.Location,
1258                                         "The namespace `{0}' already contains a definition for `{1}'",
1259                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
1260                         } else if (symbol is TypeParameter) {
1261                                 Report.Error (692, symbol.Location,
1262                                         "Duplicate type parameter `{0}'", symbol.GetSignatureForError ());
1263                         } else {
1264                                 Report.Error (102, symbol.Location,
1265                                               "The type `{0}' already contains a definition for `{1}'",
1266                                               GetSignatureForError (), symbol.MemberName.Name);
1267                         }
1268
1269                         return false;
1270                 }
1271
1272                 protected void RemoveFromContainer (string name)
1273                 {
1274                         defined_names.Remove (name);
1275                 }
1276
1277                 /// <summary>
1278                 ///   Returns the MemberCore associated with a given name in the declaration
1279                 ///   space. It doesn't return method based symbols !!
1280                 /// </summary>
1281                 ///
1282                 public MemberCore GetDefinition (string name)
1283                 {
1284                         MemberCore mc = null;
1285                         defined_names.TryGetValue (name, out mc);
1286                         return mc;
1287                 }
1288
1289                 //
1290                 // root_types contains all the types.  All TopLevel types
1291                 // hence have a parent that points to `root_types', that is
1292                 // why there is a non-obvious test down here.
1293                 //
1294                 public bool IsTopLevel {
1295                         get { return (Parent != null && Parent.Parent == null); }
1296                 }
1297
1298                 public virtual bool IsUnmanagedType ()
1299                 {
1300                         return false;
1301                 }
1302
1303                 protected virtual TypeAttributes TypeAttr {
1304                         get { return Module.DefaultCharSetType; }
1305                 }
1306
1307                 /// <remarks>
1308                 ///  Should be overriten by the appropriate declaration space
1309                 /// </remarks>
1310                 public abstract void DefineType ();
1311
1312                 protected void Error_MissingPartialModifier (MemberCore type)
1313                 {
1314                         Report.Error (260, type.Location,
1315                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
1316                                 type.GetSignatureForError ());
1317                 }
1318
1319                 public override string GetSignatureForError ()
1320                 {
1321                         return MemberName.GetSignatureForError ();
1322                 }
1323
1324                 TypeParameter[] initialize_type_params ()
1325                 {
1326                         if (type_param_list != null)
1327                                 return type_param_list;
1328
1329                         DeclSpace the_parent = Parent;
1330                         if (this is GenericMethod)
1331                                 the_parent = null;
1332
1333                         var list = new List<TypeParameter> ();
1334                         if (the_parent != null && the_parent.IsGeneric) {
1335                                 // FIXME: move generics info out of DeclSpace
1336                                 TypeParameter[] parent_params = the_parent.TypeParameters;
1337                                 list.AddRange (parent_params);
1338                         }
1339
1340                         int count = type_params != null ? type_params.Length : 0;
1341                         for (int i = 0; i < count; i++) {
1342                                 TypeParameter param = type_params [i];
1343                                 list.Add (param);
1344                                 if (Parent.CurrentTypeParameters != null) {
1345                                         foreach (TypeParameter tp in Parent.CurrentTypeParameters) {
1346                                                 if (tp.Name != param.Name)
1347                                                         continue;
1348
1349                                                 Report.SymbolRelatedToPreviousError (tp.Location, null);
1350                                                 Report.Warning (693, 3, param.Location,
1351                                                         "Type parameter `{0}' has the same name as the type parameter from outer type `{1}'",
1352                                                         param.Name, Parent.GetSignatureForError ());
1353                                         }
1354                                 }
1355                         }
1356
1357                         type_param_list = new TypeParameter [list.Count];
1358                         list.CopyTo (type_param_list, 0);
1359                         return type_param_list;
1360                 }
1361
1362                 public virtual void SetParameterInfo (List<Constraints> constraints_list)
1363                 {
1364                         if (!is_generic) {
1365                                 if (constraints_list != null) {
1366                                         Report.Error (
1367                                                 80, Location, "Constraints are not allowed " +
1368                                                 "on non-generic declarations");
1369                                 }
1370
1371                                 return;
1372                         }
1373
1374                         TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1375                         type_params = new TypeParameter [names.Length];
1376
1377                         //
1378                         // Register all the names
1379                         //
1380                         for (int i = 0; i < type_params.Length; i++) {
1381                                 TypeParameterName name = names [i];
1382
1383                                 Constraints constraints = null;
1384                                 if (constraints_list != null) {
1385                                         int total = constraints_list.Count;
1386                                         for (int ii = 0; ii < total; ++ii) {
1387                                                 Constraints constraints_at = (Constraints)constraints_list[ii];
1388                                                 // TODO: it is used by iterators only
1389                                                 if (constraints_at == null) {
1390                                                         constraints_list.RemoveAt (ii);
1391                                                         --total;
1392                                                         continue;
1393                                                 }
1394                                                 if (constraints_at.TypeParameter.Value == name.Name) {
1395                                                         constraints = constraints_at;
1396                                                         constraints_list.RemoveAt(ii);
1397                                                         break;
1398                                                 }
1399                                         }
1400                                 }
1401
1402                                 Variance variance = name.Variance;
1403                                 if (name.Variance != Variance.None && !(this is Delegate || this is Interface)) {
1404                                         Report.Error (1960, name.Location, "Variant type parameters can only be used with interfaces and delegates");
1405                                         variance = Variance.None;
1406                                 }
1407
1408                                 type_params [i] = new TypeParameter (
1409                                         Parent, i, new MemberName (name.Name, Location), constraints, name.OptAttributes, variance);
1410
1411                                 AddToContainer (type_params [i], name.Name);
1412                         }
1413
1414                         if (constraints_list != null && constraints_list.Count > 0) {
1415                                 foreach (Constraints constraint in constraints_list) {
1416                                         Report.Error(699, constraint.Location, "`{0}': A constraint references nonexistent type parameter `{1}'",
1417                                                 GetSignatureForError (), constraint.TypeParameter.Value);
1418                                 }
1419                         }
1420                 }
1421
1422                 protected TypeParameter[] TypeParameters {
1423                         get {
1424                                 if (!IsGeneric)
1425                                         throw new InvalidOperationException ();
1426                                 if ((PartialContainer != null) && (PartialContainer != this))
1427                                         return PartialContainer.TypeParameters;
1428                                 if (type_param_list == null)
1429                                         initialize_type_params ();
1430
1431                                 return type_param_list;
1432                         }
1433                 }
1434
1435                 public int CountTypeParameters {
1436                         get {
1437                                 return count_type_params;
1438                         }
1439                 }
1440
1441                 public override string[] ValidAttributeTargets {
1442                         get { return attribute_targets; }
1443                 }
1444
1445                 protected override bool VerifyClsCompliance ()
1446                 {
1447                         if (!base.VerifyClsCompliance ()) {
1448                                 return false;
1449                         }
1450
1451                         if (type_params != null) {
1452                                 foreach (TypeParameter tp in type_params) {
1453                                         tp.VerifyClsCompliance ();
1454                                 }
1455                         }
1456
1457                         return true;
1458                 }
1459         }
1460 }