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                         HasDynamicElement = 1 << 8,
 900                         IsAccessor = 1 << 9,            // Method is an accessor
 901                         IsGeneric = 1 << 10,            // Member contains type arguments
 902
 903                         PendingMetaInflate = 1 << 12,
 904                         PendingMakeMethod = 1 << 13,
 905                         PendingMemberCacheMembers = 1 << 14,
 906                         PendingBaseTypeInflate = 1 << 15,
 907                         InterfacesExpanded = 1 << 16,
 908                         IsNotRealProperty = 1 << 17,
 909                 }
 910
 911                 protected Modifiers modifiers;
 912                 protected StateFlags state;
 913                 protected IMemberDefinition definition;
 914                 public readonly MemberKind Kind;
 915                 protected TypeSpec declaringType;
 916
 917 #if DEBUG
 918                 static int counter;
 919                 public int ID = counter++;
 920 #endif
 921
 922                 protected MemberSpec (MemberKind kind, TypeSpec declaringType, IMemberDefinition definition, Modifiers modifiers)
 923                 {
 924                         this.Kind = kind;
 925                         this.declaringType = declaringType;
 926                         this.definition = definition;
 927                         this.modifiers = modifiers;
 928
 929                         state = StateFlags.Obsolete_Undetected | StateFlags.CLSCompliant_Undetected;
 930                 }
 931
 932                 #region Properties
 933
 934                 public Assembly Assembly {
 935                         get {
 936                                 return definition.Assembly;
 937                         }
 938                 }
 939
 940                 public virtual int Arity {
 941                         get {
 942                                 return 0;
 943                         }
 944                 }
 945
 946                 public TypeSpec DeclaringType {
 947                         get {
 948                                 return declaringType;
 949                         }
 950                         set {
 951                                 declaringType = value;
 952                         }
 953                 }
 954
 955                 public IMemberDefinition MemberDefinition {
 956                         get {
 957                                 return definition;
 958                         }
 959                 }
 960
 961                 public Modifiers Modifiers {
 962                         get {
 963                                 return modifiers;
 964                         }
 965                         set {
 966                                 modifiers = value;
 967                         }
 968                 }
 969
 970                 public virtual string Name {
 971                         get {
 972                                 return definition.Name;
 973                         }
 974                 }
 975
 976                 public bool IsAbstract {
 977                         get { return (modifiers & Modifiers.ABSTRACT) != 0; }
 978                 }
 979
 980                 public bool IsAccessor {
 981                         get {
 982                                 return (state & StateFlags.IsAccessor) != 0;
 983                         }
 984                         set {
 985                                 state = value ? state | StateFlags.IsAccessor : state & ~StateFlags.IsAccessor;
 986                         }
 987                 }
 988
 989                 //
 990                 // Return true when this member is a generic in C# terms
 991                 // A nested non-generic type of generic type will return false
 992                 //
 993                 public bool IsGeneric {
 994                         get {
 995                                 return (state & StateFlags.IsGeneric) != 0;
 996                         }
 997                         set {
 998                                 state = value ? state | StateFlags.IsGeneric : state & ~StateFlags.IsGeneric;
 999                         }
1000                 }
1001
1002                 public bool IsPrivate {
1003                         get { return (modifiers & Modifiers.PRIVATE) != 0; }
1004                 }
1005
1006                 public bool IsPublic {
1007                         get { return (modifiers & Modifiers.PUBLIC) != 0; }
1008                 }
1009
1010                 public bool IsStatic {
1011                         get {
1012                                 return (modifiers & Modifiers.STATIC) != 0;
1013                         }
1014                 }
1015
1016                 #endregion
1017
1018                 public virtual ObsoleteAttribute GetAttributeObsolete ()
1019                 {
1020                         if ((state & (StateFlags.Obsolete | StateFlags.Obsolete_Undetected)) == 0)
1021                                 return null;
1022
1023                         state &= ~StateFlags.Obsolete_Undetected;
1024
1025                         var oa = definition.GetAttributeObsolete ();
1026                         if (oa != null)
1027                                 state |= StateFlags.Obsolete;
1028
1029                         return oa;
1030                 }
1031
1032                 protected virtual bool IsNotCLSCompliant ()
1033                 {
1034                         return MemberDefinition.IsNotCLSCompliant ();
1035                 }
1036
1037                 public virtual string GetSignatureForError ()
1038                 {
1039                         var bf = MemberDefinition as Property.BackingField;
1040                         var name = bf == null ? Name : bf.OriginalName;
1041                         return DeclaringType.GetSignatureForError () + "." + name;
1042                 }
1043
1044                 public virtual MemberSpec InflateMember (TypeParameterInflator inflator)
1045                 {
1046                         var inflated = (MemberSpec) MemberwiseClone ();
1047                         inflated.declaringType = inflator.TypeInstance;
1048                         inflated.state |= StateFlags.PendingMetaInflate;
1049 #if DEBUG
1050                         if (inflated.ID > 0)
1051                                 inflated.ID = -inflated.ID;
1052 #endif
1053                         return inflated;
1054                 }
1055
1056                 //
1057                 // Is this member accessible from invocationType
1058                 //
1059                 public bool IsAccessible (TypeSpec invocationType)
1060                 {
1061                         var ma = Modifiers & Modifiers.AccessibilityMask;
1062                         if (ma == Modifiers.PUBLIC)
1063                                 return true;
1064
1065                         var parentType = /* this as TypeSpec ?? */ DeclaringType;
1066
1067                         //
1068                         // If only accessible to the current class or children
1069                         //
1070                         if (ma == Modifiers.PRIVATE)
1071                                 return invocationType.MemberDefinition == parentType.MemberDefinition ||
1072                                         TypeManager.IsNestedChildOf (invocationType, parentType);
1073
1074                         if ((ma & Modifiers.INTERNAL) != 0) {
1075                                 var b = TypeManager.IsThisOrFriendAssembly (invocationType == InternalType.FakeInternalType ?
1076                                          CodeGen.Assembly.Builder : invocationType.Assembly, Assembly);
1077                                 if (b || ma == Modifiers.INTERNAL)
1078                                         return b;
1079                         }
1080
1081                         // PROTECTED
1082                         if (!TypeManager.IsNestedFamilyAccessible (invocationType, parentType))
1083                                 return false;
1084
1085                         return true;
1086                 }
1087
1088                 //
1089                 // Returns member CLS compliance based on full member hierarchy
1090                 //
1091                 public bool IsCLSCompliant ()
1092                 {
1093                         if ((state & StateFlags.CLSCompliant_Undetected) != 0) {
1094                                 state &= ~StateFlags.CLSCompliant_Undetected;
1095
1096                                 if (IsNotCLSCompliant ())
1097                                         return false;
1098
1099                                 bool compliant;
1100                                 if (DeclaringType != null) {
1101                                         compliant = DeclaringType.IsCLSCompliant ();
1102                                 } else {
1103                                         // TODO: NEED AssemblySpec
1104                                         if (MemberDefinition.IsImported) {
1105                                                 var attr = MemberDefinition.Assembly.GetCustomAttributes (typeof (CLSCompliantAttribute), false);
1106                                                 compliant = attr.Length > 0 && ((CLSCompliantAttribute) attr[0]).IsCompliant;
1107                                         } else {
1108                                                 compliant = CodeGen.Assembly.IsClsCompliant;
1109                                         }
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                 Assembly Assembly { get; }
1149                 string Name { get; }
1150                 bool IsImported { get; }
1151
1152                 string[] ConditionalConditions ();
1153                 ObsoleteAttribute GetAttributeObsolete ();
1154                 bool IsNotCLSCompliant ();
1155                 void SetIsAssigned ();
1156                 void SetIsUsed ();
1157         }
1158
1159         public interface IParametersMember : IInterfaceMemberSpec
1160         {
1161                 AParametersCollection Parameters { get; }
1162         }
1163
1164         public interface IInterfaceMemberSpec
1165         {
1166                 TypeSpec MemberType { get; }
1167         }
1168
1169         //
1170         // Base type container declaration. It exists to handle partial types
1171         // which share same definition (PartialContainer) but have different
1172         // resolve scopes
1173         //
1174         public abstract class DeclSpace : MemberCore {
1175                 /// <summary>
1176                 ///   This points to the actual definition that is being
1177                 ///   created with System.Reflection.Emit
1178                 /// </summary>
1179                 public TypeBuilder TypeBuilder;
1180
1181                 //
1182                 // This is the namespace in which this typecontainer
1183                 // was declared.  We use this to resolve names.
1184                 //
1185                 public NamespaceEntry NamespaceEntry;
1186
1187                 public readonly string Basename;
1188
1189                 protected Dictionary<string, MemberCore> defined_names;
1190
1191                 public TypeContainer PartialContainer;
1192
1193                 protected readonly bool is_generic;
1194                 readonly int count_type_params;
1195                 protected TypeParameter[] type_params;
1196                 TypeParameter[] type_param_list;
1197
1198                 //
1199                 // Whether we are Generic
1200                 //
1201                 public bool IsGeneric {
1202                         get {
1203                                 if (is_generic)
1204                                         return true;
1205                                 else if (Parent != null)
1206                                         return Parent.IsGeneric;
1207                                 else
1208                                         return false;
1209                         }
1210                 }
1211
1212                 static string[] attribute_targets = new string [] { "type" };
1213
1214                 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
1215                                   Attributes attrs)
1216                         : base (parent, name, attrs)
1217                 {
1218                         NamespaceEntry = ns;
1219                         Basename = name.Basename;
1220                         defined_names = new Dictionary<string, MemberCore> ();
1221                         PartialContainer = null;
1222                         if (name.TypeArguments != null) {
1223                                 is_generic = true;
1224                                 count_type_params = name.TypeArguments.Count;
1225                         }
1226                         if (parent != null)
1227                                 count_type_params += parent.count_type_params;
1228                 }
1229
1230                 /// <summary>
1231                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
1232                 /// </summary>
1233                 protected virtual bool AddToContainer (MemberCore symbol, string name)
1234                 {
1235                         MemberCore mc;
1236                         if (!defined_names.TryGetValue (name, out mc)) {
1237                                 defined_names.Add (name, symbol);
1238                                 return true;
1239                         }
1240
1241                         if (((mc.ModFlags | symbol.ModFlags) & Modifiers.COMPILER_GENERATED) != 0)
1242                                 return true;
1243
1244                         if (symbol.EnableOverloadChecks (mc))
1245                                 return true;
1246
1247                         InterfaceMemberBase im = mc as InterfaceMemberBase;
1248                         if (im != null && im.IsExplicitImpl)
1249                                 return true;
1250
1251                         Report.SymbolRelatedToPreviousError (mc);
1252                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
1253                                 Error_MissingPartialModifier (symbol);
1254                                 return false;
1255                         }
1256
1257                         if (this is ModuleContainer) {
1258                                 Report.Error (101, symbol.Location,
1259                                         "The namespace `{0}' already contains a definition for `{1}'",
1260                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
1261                         } else if (symbol is TypeParameter) {
1262                                 Report.Error (692, symbol.Location,
1263                                         "Duplicate type parameter `{0}'", symbol.GetSignatureForError ());
1264                         } else {
1265                                 Report.Error (102, symbol.Location,
1266                                               "The type `{0}' already contains a definition for `{1}'",
1267                                               GetSignatureForError (), symbol.MemberName.Name);
1268                         }
1269
1270                         return false;
1271                 }
1272
1273                 protected void RemoveFromContainer (string name)
1274                 {
1275                         defined_names.Remove (name);
1276                 }
1277
1278                 /// <summary>
1279                 ///   Returns the MemberCore associated with a given name in the declaration
1280                 ///   space. It doesn't return method based symbols !!
1281                 /// </summary>
1282                 ///
1283                 public MemberCore GetDefinition (string name)
1284                 {
1285                         MemberCore mc = null;
1286                         defined_names.TryGetValue (name, out mc);
1287                         return mc;
1288                 }
1289
1290                 //
1291                 // root_types contains all the types.  All TopLevel types
1292                 // hence have a parent that points to `root_types', that is
1293                 // why there is a non-obvious test down here.
1294                 //
1295                 public bool IsTopLevel {
1296                         get { return (Parent != null && Parent.Parent == null); }
1297                 }
1298
1299                 public virtual bool IsUnmanagedType ()
1300                 {
1301                         return false;
1302                 }
1303
1304                 protected virtual TypeAttributes TypeAttr {
1305                         get { return Module.DefaultCharSetType; }
1306                 }
1307
1308                 /// <remarks>
1309                 ///  Should be overriten by the appropriate declaration space
1310                 /// </remarks>
1311                 public abstract TypeBuilder DefineType ();
1312
1313                 protected void Error_MissingPartialModifier (MemberCore type)
1314                 {
1315                         Report.Error (260, type.Location,
1316                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
1317                                 type.GetSignatureForError ());
1318                 }
1319
1320                 public override string GetSignatureForError ()
1321                 {
1322                         return MemberName.GetSignatureForError ();
1323                 }
1324
1325                 public bool CheckAccessLevel (TypeSpec check_type)
1326                 {
1327 // TODO: Use this instead
1328 //                      return PartialContainer.Definition.IsAccessible (check_type);
1329
1330                         TypeSpec tb = PartialContainer.Definition;
1331                         check_type = check_type.GetDefinition ();
1332
1333                         var check_attr = check_type.Modifiers & Modifiers.AccessibilityMask;
1334
1335                         switch (check_attr){
1336                         case Modifiers.PUBLIC:
1337                                 return true;
1338
1339                         case Modifiers.INTERNAL:
1340                                 return TypeManager.IsThisOrFriendAssembly (Assembly, check_type.Assembly);
1341
1342                         case Modifiers.PRIVATE:
1343                                 TypeSpec declaring = check_type.DeclaringType;
1344                                 return tb == declaring.GetDefinition () || TypeManager.IsNestedChildOf (tb, declaring);
1345
1346                         case Modifiers.PROTECTED:
1347                                 //
1348                                 // Only accessible to methods in current type or any subtypes
1349                                 //
1350                                 return TypeManager.IsNestedFamilyAccessible (tb, check_type.DeclaringType);
1351
1352                         case Modifiers.PROTECTED | Modifiers.INTERNAL:
1353                                 if (TypeManager.IsThisOrFriendAssembly (Assembly, check_type.Assembly))
1354                                         return true;
1355
1356                                 goto case Modifiers.PROTECTED;
1357                         }
1358
1359                         throw new NotImplementedException (check_attr.ToString ());
1360                 }
1361
1362                 public override Assembly Assembly {
1363                         get { return Module.Assembly; }
1364                 }
1365
1366                 public virtual ModuleContainer Module {
1367                         get { return Parent.Module; }
1368                 }
1369
1370                 TypeParameter[] initialize_type_params ()
1371                 {
1372                         if (type_param_list != null)
1373                                 return type_param_list;
1374
1375                         DeclSpace the_parent = Parent;
1376                         if (this is GenericMethod)
1377                                 the_parent = null;
1378
1379                         var list = new List<TypeParameter> ();
1380                         if (the_parent != null && the_parent.IsGeneric) {
1381                                 // FIXME: move generics info out of DeclSpace
1382                                 TypeParameter[] parent_params = the_parent.TypeParameters;
1383                                 list.AddRange (parent_params);
1384                         }
1385
1386                         int count = type_params != null ? type_params.Length : 0;
1387                         for (int i = 0; i < count; i++) {
1388                                 TypeParameter param = type_params [i];
1389                                 list.Add (param);
1390                                 if (Parent.CurrentTypeParameters != null) {
1391                                         foreach (TypeParameter tp in Parent.CurrentTypeParameters) {
1392                                                 if (tp.Name != param.Name)
1393                                                         continue;
1394
1395                                                 Report.SymbolRelatedToPreviousError (tp.Location, null);
1396                                                 Report.Warning (693, 3, param.Location,
1397                                                         "Type parameter `{0}' has the same name as the type parameter from outer type `{1}'",
1398                                                         param.Name, Parent.GetSignatureForError ());
1399                                         }
1400                                 }
1401                         }
1402
1403                         type_param_list = new TypeParameter [list.Count];
1404                         list.CopyTo (type_param_list, 0);
1405                         return type_param_list;
1406                 }
1407
1408                 public virtual void SetParameterInfo (List<Constraints> constraints_list)
1409                 {
1410                         if (!is_generic) {
1411                                 if (constraints_list != null) {
1412                                         Report.Error (
1413                                                 80, Location, "Constraints are not allowed " +
1414                                                 "on non-generic declarations");
1415                                 }
1416
1417                                 return;
1418                         }
1419
1420                         TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1421                         type_params = new TypeParameter [names.Length];
1422
1423                         //
1424                         // Register all the names
1425                         //
1426                         for (int i = 0; i < type_params.Length; i++) {
1427                                 TypeParameterName name = names [i];
1428
1429                                 Constraints constraints = null;
1430                                 if (constraints_list != null) {
1431                                         int total = constraints_list.Count;
1432                                         for (int ii = 0; ii < total; ++ii) {
1433                                                 Constraints constraints_at = (Constraints)constraints_list[ii];
1434                                                 // TODO: it is used by iterators only
1435                                                 if (constraints_at == null) {
1436                                                         constraints_list.RemoveAt (ii);
1437                                                         --total;
1438                                                         continue;
1439                                                 }
1440                                                 if (constraints_at.TypeParameter.Value == name.Name) {
1441                                                         constraints = constraints_at;
1442                                                         constraints_list.RemoveAt(ii);
1443                                                         break;
1444                                                 }
1445                                         }
1446                                 }
1447
1448                                 Variance variance = name.Variance;
1449                                 if (name.Variance != Variance.None && !(this is Delegate || this is Interface)) {
1450                                         Report.Error (1960, name.Location, "Variant type parameters can only be used with interfaces and delegates");
1451                                         variance = Variance.None;
1452                                 }
1453
1454                                 type_params [i] = new TypeParameter (
1455                                         Parent, i, new MemberName (name.Name, Location), constraints, name.OptAttributes, variance);
1456
1457                                 AddToContainer (type_params [i], name.Name);
1458                         }
1459
1460                         if (constraints_list != null && constraints_list.Count > 0) {
1461                                 foreach (Constraints constraint in constraints_list) {
1462                                         Report.Error(699, constraint.Location, "`{0}': A constraint references nonexistent type parameter `{1}'",
1463                                                 GetSignatureForError (), constraint.TypeParameter.Value);
1464                                 }
1465                         }
1466                 }
1467
1468                 protected TypeParameter[] TypeParameters {
1469                         get {
1470                                 if (!IsGeneric)
1471                                         throw new InvalidOperationException ();
1472                                 if ((PartialContainer != null) && (PartialContainer != this))
1473                                         return PartialContainer.TypeParameters;
1474                                 if (type_param_list == null)
1475                                         initialize_type_params ();
1476
1477                                 return type_param_list;
1478                         }
1479                 }
1480
1481                 public int CountTypeParameters {
1482                         get {
1483                                 return count_type_params;
1484                         }
1485                 }
1486
1487                 public override string[] ValidAttributeTargets {
1488                         get { return attribute_targets; }
1489                 }
1490
1491                 protected override bool VerifyClsCompliance ()
1492                 {
1493                         if (!base.VerifyClsCompliance ()) {
1494                                 return false;
1495                         }
1496
1497                         if (type_params != null) {
1498                                 foreach (TypeParameter tp in type_params) {
1499                                         tp.VerifyClsCompliance ();
1500                                 }
1501                         }
1502
1503                         return true;
1504                 }
1505         }
1506 }