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 readonly 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 bool IsGeneric {
 107                         get {
 108                                 if (TypeArguments != null)
 109                                         return true;
 110                                 else if (Left != null)
 111                                         return Left.IsGeneric;
 112                                 else
 113                                         return false;
 114                         }
 115                 }
 116
 117                 public string GetName (bool is_generic)
 118                 {
 119                         string name = is_generic ? Basename : Name;
 120                         if (Left != null)
 121                                 return Left.GetName (is_generic) + (is_double_colon ? "::" : ".") + name;
 122
 123                         return name;
 124                 }
 125
 126                 public ATypeNameExpression GetTypeExpression ()
 127                 {
 128                         if (Left == null) {
 129                                 if (TypeArguments != null)
 130                                         return new SimpleName (Basename, TypeArguments, Location);
 131
 132                                 return new SimpleName (Name, Location);
 133                         }
 134
 135                         if (is_double_colon) {
 136                                 if (Left.Left != null)
 137                                         throw new InternalErrorException ("The left side of a :: should be an identifier");
 138                                 return new QualifiedAliasMember (Left.Name, Name, TypeArguments, Location);
 139                         }
 140
 141                         Expression lexpr = Left.GetTypeExpression ();
 142                         return new MemberAccess (lexpr, Name, TypeArguments, Location);
 143                 }
 144
 145                 public MemberName Clone ()
 146                 {
 147                         MemberName left_clone = Left == null ? null : Left.Clone ();
 148                         return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
 149                 }
 150
 151                 public string Basename {
 152                         get {
 153                                 if (TypeArguments != null)
 154                                         return MakeName (Name, TypeArguments);
 155                                 return Name;
 156                         }
 157                 }
 158
 159                 public string GetSignatureForError ()
 160                 {
 161                         string append = TypeArguments == null ? "" : "<" + TypeArguments.GetSignatureForError () + ">";
 162                         if (Left == null)
 163                                 return Name + append;
 164                         string connect = is_double_colon ? "::" : ".";
 165                         return Left.GetSignatureForError () + connect + Name + append;
 166                 }
 167
 168                 public override bool Equals (object other)
 169                 {
 170                         return Equals (other as MemberName);
 171                 }
 172
 173                 public bool Equals (MemberName other)
 174                 {
 175                         if (this == other)
 176                                 return true;
 177                         if (other == null || Name != other.Name)
 178                                 return false;
 179                         if (is_double_colon != other.is_double_colon)
 180                                 return false;
 181
 182                         if ((TypeArguments != null) &&
 183                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 184                                 return false;
 185
 186                         if ((TypeArguments == null) && (other.TypeArguments != null))
 187                                 return false;
 188
 189                         if (Left == null)
 190                                 return other.Left == null;
 191
 192                         return Left.Equals (other.Left);
 193                 }
 194
 195                 public override int GetHashCode ()
 196                 {
 197                         int hash = Name.GetHashCode ();
 198                         for (MemberName n = Left; n != null; n = n.Left)
 199                                 hash ^= n.Name.GetHashCode ();
 200                         if (is_double_colon)
 201                                 hash ^= 0xbadc01d;
 202
 203                         if (TypeArguments != null)
 204                                 hash ^= TypeArguments.Count << 5;
 205
 206                         return hash & 0x7FFFFFFF;
 207                 }
 208
 209                 public int CountTypeArguments {
 210                         get {
 211                                 if (TypeArguments != null)
 212                                         return TypeArguments.Count;
 213                                 else if (Left != null)
 214                                         return Left.CountTypeArguments;
 215                                 else
 216                                         return 0;
 217                         }
 218                 }
 219
 220                 public static string MakeName (string name, TypeArguments args)
 221                 {
 222                         if (args == null)
 223                                 return name;
 224
 225                         return name + "`" + args.Count;
 226                 }
 227
 228                 public static string MakeName (string name, int count)
 229                 {
 230                         return name + "`" + count;
 231                 }
 232         }
 233
 234         public class SimpleMemberName
 235         {
 236                 public string Value;
 237                 public Location Location;
 238
 239                 public SimpleMemberName (string name, Location loc)
 240                 {
 241                         this.Value = name;
 242                         this.Location = loc;
 243                 }
 244         }
 245
 246         /// <summary>
 247         ///   Base representation for members.  This is used to keep track
 248         ///   of Name, Location and Modifier flags, and handling Attributes.
 249         /// </summary>
 250         public abstract class MemberCore : Attributable, IMemberContext, IMemberDefinition
 251         {
 252                 /// <summary>
 253                 ///   Public name
 254                 /// </summary>
 255
 256                 protected string cached_name;
 257                 // TODO: Remove in favor of MemberName
 258                 public string Name {
 259                         get {
 260                                 if (cached_name == null)
 261                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 262                                 return cached_name;
 263                         }
 264                 }
 265
 266                 // Is not readonly because of IndexerName attribute
 267                 private MemberName member_name;
 268                 public MemberName MemberName {
 269                         get { return member_name; }
 270                 }
 271
 272                 /// <summary>
 273                 ///   Modifier flags that the user specified in the source code
 274                 /// </summary>
 275                 private Modifiers mod_flags;
 276                 public Modifiers ModFlags {
 277                         set {
 278                                 mod_flags = value;
 279                                 if ((value & Modifiers.COMPILER_GENERATED) != 0)
 280                                         caching_flags = Flags.IsUsed | Flags.IsAssigned;
 281                         }
 282                         get {
 283                                 return mod_flags;
 284                         }
 285                 }
 286
 287                 public /*readonly*/ DeclSpace Parent;
 288
 289                 /// <summary>
 290                 ///   Location where this declaration happens
 291                 /// </summary>
 292                 public Location Location {
 293                         get { return member_name.Location; }
 294                 }
 295
 296                 /// <summary>
 297                 ///   XML documentation comment
 298                 /// </summary>
 299                 protected string comment;
 300
 301                 /// <summary>
 302                 ///   Represents header string for documentation comment
 303                 ///   for each member types.
 304                 /// </summary>
 305                 public abstract string DocCommentHeader { get; }
 306
 307                 [Flags]
 308                 public enum Flags {
 309                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 310                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 311                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 312                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 313                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 314                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 315                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 316                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 317                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 318                         Excluded = 1 << 9,                                      // Method is conditional
 319                         MethodOverloadsExist = 1 << 10,         // Test for duplication must be performed
 320                         IsUsed = 1 << 11,
 321                         IsAssigned = 1 << 12,                           // Field is assigned
 322                         HasExplicitLayout       = 1 << 13,
 323                         PartialDefinitionExists = 1 << 14,      // Set when corresponding partial method definition exists
 324                         HasStructLayout         = 1 << 15                       // Has StructLayoutAttribute
 325                 }
 326
 327                 /// <summary>
 328                 ///   MemberCore flags at first detected then cached
 329                 /// </summary>
 330                 internal Flags caching_flags;
 331
 332                 public MemberCore (DeclSpace parent, MemberName name, Attributes attrs)
 333                 {
 334                         this.Parent = parent;
 335                         member_name = name;
 336                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 337                         AddAttributes (attrs, this);
 338                 }
 339
 340                 protected virtual void SetMemberName (MemberName new_name)
 341                 {
 342                         member_name = new_name;
 343                         cached_name = null;
 344                 }
 345
 346                 protected bool CheckAbstractAndExtern (bool has_block)
 347                 {
 348                         if (Parent.PartialContainer.Kind == MemberKind.Interface)
 349                                 return true;
 350
 351                         if (has_block) {
 352                                 if ((ModFlags & Modifiers.EXTERN) != 0) {
 353                                         Report.Error (179, Location, "`{0}' cannot declare a body because it is marked extern",
 354                                                 GetSignatureForError ());
 355                                         return false;
 356                                 }
 357
 358                                 if ((ModFlags & Modifiers.ABSTRACT) != 0) {
 359                                         Report.Error (500, Location, "`{0}' cannot declare a body because it is marked abstract",
 360                                                 GetSignatureForError ());
 361                                         return false;
 362                                 }
 363                         } else {
 364                                 if ((ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN | Modifiers.PARTIAL)) == 0 && !(Parent is Delegate)) {
 365                                         if (RootContext.Version >= LanguageVersion.V_3) {
 366                                                 Property.PropertyMethod pm = this as Property.PropertyMethod;
 367                                                 if (pm is Indexer.GetIndexerMethod || pm is Indexer.SetIndexerMethod)
 368                                                         pm = null;
 369
 370                                                 if (pm != null && (pm.Property.Get.IsDummy || pm.Property.Set.IsDummy)) {
 371                                                         Report.Error (840, Location,
 372                                                                 "`{0}' must have a body because it is not marked abstract or extern. The property can be automatically implemented when you define both accessors",
 373                                                                 GetSignatureForError ());
 374                                                         return false;
 375                                                 }
 376                                         }
 377
 378                                         Report.Error (501, Location, "`{0}' must have a body because it is not marked abstract, extern, or partial",
 379                                                       GetSignatureForError ());
 380                                         return false;
 381                                 }
 382                         }
 383
 384                         return true;
 385                 }
 386
 387                 protected void CheckProtectedModifier ()
 388                 {
 389                         if ((ModFlags & Modifiers.PROTECTED) == 0)
 390                                 return;
 391
 392                         if (Parent.PartialContainer.Kind == MemberKind.Struct) {
 393                                 Report.Error (666, Location, "`{0}': Structs cannot contain protected members",
 394                                         GetSignatureForError ());
 395                                 return;
 396                         }
 397
 398                         if ((Parent.ModFlags & Modifiers.STATIC) != 0) {
 399                                 Report.Error (1057, Location, "`{0}': Static classes cannot contain protected members",
 400                                         GetSignatureForError ());
 401                                 return;
 402                         }
 403
 404                         if ((Parent.ModFlags & Modifiers.SEALED) != 0 && (ModFlags & Modifiers.OVERRIDE) == 0 &&
 405                                 !(this is Destructor)) {
 406                                 Report.Warning (628, 4, Location, "`{0}': new protected member declared in sealed class",
 407                                         GetSignatureForError ());
 408                                 return;
 409                         }
 410                 }
 411
 412                 public abstract bool Define ();
 413
 414                 public virtual string DocComment {
 415                         get {
 416                                 return comment;
 417                         }
 418                         set {
 419                                 comment = value;
 420                         }
 421                 }
 422
 423                 //
 424                 // Returns full member name for error message
 425                 //
 426                 public virtual string GetSignatureForError ()
 427                 {
 428                         if (Parent == null || Parent.Parent == null)
 429                                 return member_name.GetSignatureForError ();
 430
 431                         return Parent.GetSignatureForError () + "." + member_name.GetSignatureForError ();
 432                 }
 433
 434                 /// <summary>
 435                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 436                 /// </summary>
 437                 public virtual void Emit ()
 438                 {
 439                         if (!RootContext.VerifyClsCompliance)
 440                                 return;
 441
 442                         if (Report.WarningLevel > 0)
 443                                 VerifyClsCompliance ();
 444                 }
 445
 446                 public bool IsCompilerGenerated {
 447                         get     {
 448                                 if ((mod_flags & Modifiers.COMPILER_GENERATED) != 0)
 449                                         return true;
 450
 451                                 return Parent == null ? false : Parent.IsCompilerGenerated;
 452                         }
 453                 }
 454
 455                 public virtual bool IsUsed {
 456                         get { return (caching_flags & Flags.IsUsed) != 0; }
 457                 }
 458
 459                 protected Report Report {
 460                         get {
 461                                 return Compiler.Report;
 462                         }
 463                 }
 464
 465                 public void SetIsUsed ()
 466                 {
 467                         caching_flags |= Flags.IsUsed;
 468                 }
 469
 470                 /// <summary>
 471                 /// Returns instance of ObsoleteAttribute for this MemberCore
 472                 /// </summary>
 473                 public virtual ObsoleteAttribute GetObsoleteAttribute ()
 474                 {
 475                         if ((caching_flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0)
 476                                 return null;
 477
 478                         caching_flags &= ~Flags.Obsolete_Undetected;
 479
 480                         if (OptAttributes == null)
 481                                 return null;
 482
 483                         Attribute obsolete_attr = OptAttributes.Search (PredefinedAttributes.Get.Obsolete);
 484                         if (obsolete_attr == null)
 485                                 return null;
 486
 487                         caching_flags |= Flags.Obsolete;
 488
 489                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute ();
 490                         if (obsolete == null)
 491                                 return null;
 492
 493                         return obsolete;
 494                 }
 495
 496                 /// <summary>
 497                 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
 498                 /// </summary>
 499                 public virtual void CheckObsoleteness (Location loc)
 500                 {
 501                         ObsoleteAttribute oa = GetObsoleteAttribute ();
 502                         if (oa != null)
 503                                 AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc, Report);
 504                 }
 505
 506                 //
 507                 // Returns the access level for type `t'
 508                 //
 509                 static Modifiers GetAccessLevelFromType (Type type)
 510                 {
 511                         var ma = type.Attributes;
 512                         Modifiers mod;
 513                         switch (ma & TypeAttributes.VisibilityMask) {
 514                         case TypeAttributes.Public:
 515                         case TypeAttributes.NestedPublic:
 516                                 mod = Modifiers.PUBLIC;
 517                                 break;
 518                         case TypeAttributes.NestedPrivate:
 519                                 mod = Modifiers.PRIVATE;
 520                                 break;
 521                         case TypeAttributes.NestedFamily:
 522                                 mod = Modifiers.PROTECTED;
 523                                 break;
 524                         case TypeAttributes.NestedFamORAssem:
 525                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 526                                 break;
 527                         default:
 528                                 mod = Modifiers.INTERNAL;
 529                                 break;
 530                         }
 531
 532                         return mod;
 533                 }
 534
 535                 //
 536                 // Checks whether the type P is as accessible as this member
 537                 //
 538                 public bool IsAccessibleAs (Type 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 (TypeManager.IsGenericParameter (p))
 552                                 return true;
 553
 554                         if (TypeManager.IsGenericType (p)) {
 555                                 foreach (Type t in TypeManager.GetTypeArguments (p)) {
 556                                         if (!IsAccessibleAs (t))
 557                                                 return false;
 558                                 }
 559                         }
 560
 561                         for (Type p_parent = null; p != null; p = p_parent) {
 562                                 p_parent = p.DeclaringType;
 563                                 var pAccess = GetAccessLevelFromType (p);
 564                                 if (pAccess == Modifiers.PUBLIC)
 565                                         continue;
 566
 567                                 bool same_access_restrictions = false;
 568                                 for (MemberCore mc = this; !same_access_restrictions && mc != null && mc.Parent != null; mc = mc.Parent) {
 569                                         var al = mc.ModFlags & Modifiers.AccessibilityMask;
 570                                         switch (pAccess) {
 571                                         case Modifiers.INTERNAL:
 572                                                 if (al == Modifiers.PRIVATE || al == Modifiers.INTERNAL)
 573                                                         same_access_restrictions = TypeManager.IsThisOrFriendAssembly (Parent.Module.Assembly, p.Assembly);
 574
 575                                                 break;
 576
 577                                         case Modifiers.PROTECTED:
 578                                                 if (al == Modifiers.PROTECTED) {
 579                                                         same_access_restrictions = mc.Parent.IsBaseType (p_parent);
 580                                                         break;
 581                                                 }
 582
 583                                                 if (al == Modifiers.PRIVATE) {
 584                                                         //
 585                                                         // When type is private and any of its parents derives from
 586                                                         // protected type then the type is accessible
 587                                                         //
 588                                                         while (mc.Parent != null) {
 589                                                                 if (mc.Parent.IsBaseType (p_parent))
 590                                                                         same_access_restrictions = true;
 591                                                                 mc = mc.Parent;
 592                                                         }
 593                                                 }
 594
 595                                                 break;
 596
 597                                         case Modifiers.PROTECTED | Modifiers.INTERNAL:
 598                                                 if (al == Modifiers.INTERNAL)
 599                                                         same_access_restrictions = TypeManager.IsThisOrFriendAssembly (Parent.Module.Assembly, p.Assembly);
 600                                                 else if (al == Modifiers.PROTECTED)
 601                                                         same_access_restrictions = mc.Parent.IsBaseType (p_parent);
 602                                                 else if (al == (Modifiers.PROTECTED | Modifiers.INTERNAL))
 603                                                         same_access_restrictions = mc.Parent.IsBaseType (p_parent) &&
 604                                                                 TypeManager.IsThisOrFriendAssembly (Parent.Module.Assembly, p.Assembly);
 605                                                 break;
 606
 607                                         case Modifiers.PRIVATE:
 608                                                 //
 609                                                 // Both are private and share same parent
 610                                                 //
 611                                                 if (al == Modifiers.PRIVATE) {
 612                                                         var decl = mc.Parent;
 613                                                         do {
 614                                                                 same_access_restrictions = TypeManager.IsEqual (decl.TypeBuilder, p_parent);
 615                                                         } while (!same_access_restrictions && !decl.IsTopLevel && (decl = decl.Parent) != null);
 616                                                 }
 617
 618                                                 break;
 619
 620                                         default:
 621                                                 throw new InternalErrorException (al.ToString ());
 622                                         }
 623                                 }
 624
 625                                 if (!same_access_restrictions)
 626                                         return false;
 627                         }
 628
 629                         return true;
 630                 }
 631
 632                 /// <summary>
 633                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 634                 /// </summary>
 635                 public override bool IsClsComplianceRequired ()
 636                 {
 637                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 638                                 return (caching_flags & Flags.ClsCompliant) != 0;
 639
 640                         if (GetClsCompliantAttributeValue () && IsExposedFromAssembly ()) {
 641                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 642                                 caching_flags |= Flags.ClsCompliant;
 643                                 return true;
 644                         }
 645
 646                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 647                         return false;
 648                 }
 649
 650                 /// <summary>
 651                 /// Returns true when MemberCore is exposed from assembly.
 652                 /// </summary>
 653                 public bool IsExposedFromAssembly ()
 654                 {
 655                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 656                                 return false;
 657
 658                         DeclSpace parentContainer = Parent.PartialContainer;
 659                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 660                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 661                                         return false;
 662                                 parentContainer = parentContainer.Parent;
 663                         }
 664                         return true;
 665                 }
 666
 667                 public virtual ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc)
 668                 {
 669                         return Parent.LookupExtensionMethod (extensionType, name, loc);
 670                 }
 671
 672                 public virtual FullNamedExpression LookupNamespaceAlias (string name)
 673                 {
 674                         return Parent.NamespaceEntry.LookupNamespaceAlias (name);
 675                 }
 676
 677                 public virtual FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
 678                 {
 679                         return Parent.LookupNamespaceOrType (name, loc, ignore_cs0104);
 680                 }
 681
 682                 /// <summary>
 683                 /// Goes through class hierarchy and gets value of first found CLSCompliantAttribute.
 684                 /// If no is attribute exists then assembly CLSCompliantAttribute is returned.
 685                 /// </summary>
 686                 public virtual bool GetClsCompliantAttributeValue ()
 687                 {
 688                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 689                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
 690
 691                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 692
 693                         if (OptAttributes != null) {
 694                                 Attribute cls_attribute = OptAttributes.Search (
 695                                         PredefinedAttributes.Get.CLSCompliant);
 696                                 if (cls_attribute != null) {
 697                                         caching_flags |= Flags.HasClsCompliantAttribute;
 698                                         bool value = cls_attribute.GetClsCompliantAttributeValue ();
 699                                         if (value)
 700                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 701                                         return value;
 702                                 }
 703                         }
 704
 705                         // It's null for TypeParameter
 706                         if (Parent == null)
 707                                 return false;
 708
 709                         if (Parent.GetClsCompliantAttributeValue ()) {
 710                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 711                                 return true;
 712                         }
 713                         return false;
 714                 }
 715
 716                 /// <summary>
 717                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 718                 /// </summary>
 719                 protected bool HasClsCompliantAttribute {
 720                         get {
 721                                 if ((caching_flags & Flags.HasCompliantAttribute_Undetected) != 0)
 722                                         GetClsCompliantAttributeValue ();
 723
 724                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 725                         }
 726                 }
 727
 728                 /// <summary>
 729                 /// Returns true when a member supports multiple overloads (methods, indexers, etc)
 730                 /// </summary>
 731                 public virtual bool EnableOverloadChecks (MemberCore overload)
 732                 {
 733                         return false;
 734                 }
 735
 736                 /// <summary>
 737                 /// The main virtual method for CLS-Compliant verifications.
 738                 /// The method returns true if member is CLS-Compliant and false if member is not
 739                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 740                 /// and add their extra verifications.
 741                 /// </summary>
 742                 protected virtual bool VerifyClsCompliance ()
 743                 {
 744                         if (!IsClsComplianceRequired ()) {
 745                                 if (HasClsCompliantAttribute && Report.WarningLevel >= 2) {
 746                                         if (!IsExposedFromAssembly ()) {
 747                                                 Attribute a = OptAttributes.Search (PredefinedAttributes.Get.CLSCompliant);
 748                                                 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 ());
 749                                         }
 750
 751                                         if (!CodeGen.Assembly.IsClsCompliant) {
 752                                                 Attribute a = OptAttributes.Search (PredefinedAttributes.Get.CLSCompliant);
 753                                                 Report.Warning (3021, 2, a.Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
 754                                         }
 755                                 }
 756                                 return false;
 757                         }
 758
 759                         if (HasClsCompliantAttribute) {
 760                                 if (CodeGen.Assembly.ClsCompliantAttribute == null && !CodeGen.Assembly.IsClsCompliant) {
 761                                         Attribute a = OptAttributes.Search (PredefinedAttributes.Get.CLSCompliant);
 762                                         Report.Warning (3014, 1, a.Location,
 763                                                 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 764                                                 GetSignatureForError ());
 765                                         return false;
 766                                 }
 767
 768                                 if (!Parent.IsClsComplianceRequired ()) {
 769                                         Attribute a = OptAttributes.Search (PredefinedAttributes.Get.CLSCompliant);
 770                                         Report.Warning (3018, 1, a.Location, "`{0}' cannot be marked as CLS-compliant because it is a member of non CLS-compliant type `{1}'",
 771                                                 GetSignatureForError (), Parent.GetSignatureForError ());
 772                                         return false;
 773                                 }
 774                         }
 775
 776                         if (member_name.Name [0] == '_') {
 777                                 Report.Warning (3008, 1, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 778                         }
 779                         return true;
 780                 }
 781
 782                 //
 783                 // Raised (and passed an XmlElement that contains the comment)
 784                 // when GenerateDocComment is writing documentation expectedly.
 785                 //
 786                 internal virtual void OnGenerateDocComment (XmlElement intermediateNode)
 787                 {
 788                 }
 789
 790                 //
 791                 // Returns a string that represents the signature for this
 792                 // member which should be used in XML documentation.
 793                 //
 794                 public virtual string GetDocCommentName (DeclSpace ds)
 795                 {
 796                         if (ds == null || this is DeclSpace)
 797                                 return DocCommentHeader + Name;
 798                         else
 799                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 800                 }
 801
 802                 //
 803                 // Generates xml doc comments (if any), and if required,
 804                 // handle warning report.
 805                 //
 806                 internal virtual void GenerateDocComment (DeclSpace ds)
 807                 {
 808                         try {
 809                                 DocUtil.GenerateDocComment (this, ds, Report);
 810                         } catch (Exception e) {
 811                                 throw new InternalErrorException (this, e);
 812                         }
 813                 }
 814
 815                 #region IMemberContext Members
 816
 817                 public virtual CompilerContext Compiler {
 818                         get { return Parent.Module.Compiler; }
 819                 }
 820
 821                 public virtual Type CurrentType {
 822                         get { return Parent.CurrentType; }
 823                 }
 824
 825                 public virtual TypeContainer CurrentTypeDefinition {
 826                         get { return Parent.CurrentTypeDefinition; }
 827                 }
 828
 829                 public virtual TypeParameter[] CurrentTypeParameters {
 830                         get { return null; }
 831                 }
 832
 833                 public bool IsObsolete {
 834                         get {
 835                                 if (GetObsoleteAttribute () != null)
 836                                         return true;
 837
 838                                 return Parent == null ? false : Parent.IsObsolete;
 839                         }
 840                 }
 841
 842                 public bool IsUnsafe {
 843                         get {
 844                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 845                                         return true;
 846
 847                                 return Parent == null ? false : Parent.IsUnsafe;
 848                         }
 849                 }
 850
 851                 public bool IsStatic {
 852                         get { return (ModFlags & Modifiers.STATIC) != 0; }
 853                 }
 854
 855                 #endregion
 856         }
 857
 858         //
 859         // Base member specification. A member specification contains
 860         // member details which can alter in the context (e.g. generic instances)
 861         //
 862         public abstract class MemberSpec
 863         {
 864                 [Flags]
 865                 protected enum StateFlags
 866                 {
 867                         Obsolete_Undetected = 1,        // Obsolete attribute has not been detected yet
 868                         Obsolete = 1 << 1                       // Member has obsolete attribute
 869                 }
 870
 871                 readonly Modifiers modifiers;
 872                 readonly string name;
 873                 protected StateFlags state;
 874                 protected IMemberDefinition definition;
 875                 public readonly MemberKind Kind;
 876
 877                 protected MemberSpec (MemberKind kind, IMemberDefinition definition, string name, Modifiers modifiers)
 878                 {
 879                         this.definition = definition;
 880                         this.name = name;
 881                         this.modifiers = modifiers;
 882
 883                         state = StateFlags.Obsolete_Undetected;
 884                 }
 885
 886                 public abstract Type DeclaringType { get; }
 887
 888                 public ObsoleteAttribute GetObsoleteAttribute ()
 889                 {
 890                         if ((state & (StateFlags.Obsolete | StateFlags.Obsolete_Undetected)) == 0)
 891                                 return null;
 892
 893                         state &= ~StateFlags.Obsolete_Undetected;
 894
 895                         var oa = definition.GetObsoleteAttribute ();
 896                         if (oa != null)
 897                                 state |= StateFlags.Obsolete;
 898
 899                         return oa;
 900                 }
 901
 902                 public IMemberDefinition MemberDefinition {
 903                         get { return definition; }
 904                 }
 905
 906                 public Modifiers Modifiers {
 907                         get { return modifiers; }
 908                 }
 909
 910                 public string Name {
 911                         get { return name; }
 912                 }
 913
 914                 public bool IsStatic {
 915                         get { return (modifiers & Modifiers.STATIC) != 0; }
 916                 }
 917         }
 918
 919         //
 920         // Member details which are same between all member
 921         // specifications
 922         //
 923         public interface IMemberDefinition
 924         {
 925                 ObsoleteAttribute GetObsoleteAttribute ();
 926                 void SetIsUsed ();
 927         }
 928
 929         /// <summary>
 930         ///   Base class for structs, classes, enumerations and interfaces.
 931         /// </summary>
 932         /// <remarks>
 933         ///   They all create new declaration spaces.  This
 934         ///   provides the common foundation for managing those name
 935         ///   spaces.
 936         /// </remarks>
 937         public abstract class DeclSpace : MemberCore {
 938                 /// <summary>
 939                 ///   This points to the actual definition that is being
 940                 ///   created with System.Reflection.Emit
 941                 /// </summary>
 942                 public TypeBuilder TypeBuilder;
 943
 944                 /// <summary>
 945                 ///   If we are a generic type, this is the type we are
 946                 ///   currently defining.  We need to lookup members on this
 947                 ///   instead of the TypeBuilder.
 948                 /// </summary>
 949                 protected Type currentType;
 950
 951                 //
 952                 // This is the namespace in which this typecontainer
 953                 // was declared.  We use this to resolve names.
 954                 //
 955                 public NamespaceEntry NamespaceEntry;
 956
 957                 private Dictionary<string, FullNamedExpression> Cache = new Dictionary<string, FullNamedExpression> ();
 958
 959                 public readonly string Basename;
 960
 961                 protected Dictionary<string, MemberCore> defined_names;
 962
 963                 public TypeContainer PartialContainer;
 964
 965                 protected readonly bool is_generic;
 966                 readonly int count_type_params;
 967                 protected TypeParameter[] type_params;
 968                 TypeParameter[] type_param_list;
 969
 970                 //
 971                 // Whether we are Generic
 972                 //
 973                 public bool IsGeneric {
 974                         get {
 975                                 if (is_generic)
 976                                         return true;
 977                                 else if (Parent != null)
 978                                         return Parent.IsGeneric;
 979                                 else
 980                                         return false;
 981                         }
 982                 }
 983
 984                 static string[] attribute_targets = new string [] { "type" };
 985
 986                 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
 987                                   Attributes attrs)
 988                         : base (parent, name, attrs)
 989                 {
 990                         NamespaceEntry = ns;
 991                         Basename = name.Basename;
 992                         defined_names = new Dictionary<string, MemberCore> ();
 993                         PartialContainer = null;
 994                         if (name.TypeArguments != null) {
 995                                 is_generic = true;
 996                                 count_type_params = name.TypeArguments.Count;
 997                         }
 998                         if (parent != null)
 999                                 count_type_params += parent.count_type_params;
1000                 }
1001
1002                 /// <summary>
1003                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
1004                 /// </summary>
1005                 protected virtual bool AddToContainer (MemberCore symbol, string name)
1006                 {
1007                         MemberCore mc;
1008                         if (!defined_names.TryGetValue (name, out mc)) {
1009                                 defined_names.Add (name, symbol);
1010                                 return true;
1011                         }
1012
1013                         if (((mc.ModFlags | symbol.ModFlags) & Modifiers.COMPILER_GENERATED) != 0)
1014                                 return true;
1015
1016                         if (symbol.EnableOverloadChecks (mc))
1017                                 return true;
1018
1019                         InterfaceMemberBase im = mc as InterfaceMemberBase;
1020                         if (im != null && im.IsExplicitImpl)
1021                                 return true;
1022
1023                         Report.SymbolRelatedToPreviousError (mc);
1024                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
1025                                 Error_MissingPartialModifier (symbol);
1026                                 return false;
1027                         }
1028
1029                         if (this is ModuleContainer) {
1030                                 Report.Error (101, symbol.Location,
1031                                         "The namespace `{0}' already contains a definition for `{1}'",
1032                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
1033                         } else if (symbol is TypeParameter) {
1034                                 Report.Error (692, symbol.Location,
1035                                         "Duplicate type parameter `{0}'", symbol.GetSignatureForError ());
1036                         } else {
1037                                 Report.Error (102, symbol.Location,
1038                                               "The type `{0}' already contains a definition for `{1}'",
1039                                               GetSignatureForError (), symbol.MemberName.Name);
1040                         }
1041
1042                         return false;
1043                 }
1044
1045                 protected void RemoveFromContainer (string name)
1046                 {
1047                         defined_names.Remove (name);
1048                 }
1049
1050                 /// <summary>
1051                 ///   Returns the MemberCore associated with a given name in the declaration
1052                 ///   space. It doesn't return method based symbols !!
1053                 /// </summary>
1054                 ///
1055                 public MemberCore GetDefinition (string name)
1056                 {
1057                         MemberCore mc = null;
1058                         defined_names.TryGetValue (name, out mc);
1059                         return mc;
1060                 }
1061
1062                 public bool IsStaticClass {
1063                         get { return (ModFlags & Modifiers.STATIC) != 0; }
1064                 }
1065
1066                 //
1067                 // root_types contains all the types.  All TopLevel types
1068                 // hence have a parent that points to `root_types', that is
1069                 // why there is a non-obvious test down here.
1070                 //
1071                 public bool IsTopLevel {
1072                         get { return (Parent != null && Parent.Parent == null); }
1073                 }
1074
1075                 public virtual bool IsUnmanagedType ()
1076                 {
1077                         return false;
1078                 }
1079
1080                 public virtual void CloseType ()
1081                 {
1082                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
1083                                 try {
1084                                         TypeBuilder.CreateType ();
1085                                 } catch {
1086                                         //
1087                                         // The try/catch is needed because
1088                                         // nested enumerations fail to load when they
1089                                         // are defined.
1090                                         //
1091                                         // Even if this is the right order (enumerations
1092                                         // declared after types).
1093                                         //
1094                                         // Note that this still creates the type and
1095                                         // it is possible to save it
1096                                 }
1097                                 caching_flags |= Flags.CloseTypeCreated;
1098                         }
1099                 }
1100
1101                 protected virtual TypeAttributes TypeAttr {
1102                         get { return Module.DefaultCharSetType; }
1103                 }
1104
1105                 /// <remarks>
1106                 ///  Should be overriten by the appropriate declaration space
1107                 /// </remarks>
1108                 public abstract TypeBuilder DefineType ();
1109
1110                 protected void Error_MissingPartialModifier (MemberCore type)
1111                 {
1112                         Report.Error (260, type.Location,
1113                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
1114                                 type.GetSignatureForError ());
1115                 }
1116
1117                 public override void Emit ()
1118                 {
1119                         if (type_params != null) {
1120                                 int offset = count_type_params - type_params.Length;
1121                                 for (int i = offset; i < type_params.Length; i++)
1122                                         CurrentTypeParameters [i - offset].Emit ();
1123                         }
1124
1125                         if ((ModFlags & Modifiers.COMPILER_GENERATED) != 0 && !Parent.IsCompilerGenerated)
1126                                 PredefinedAttributes.Get.CompilerGenerated.EmitAttribute (TypeBuilder);
1127
1128                         base.Emit ();
1129                 }
1130
1131                 public override string GetSignatureForError ()
1132                 {
1133                         return MemberName.GetSignatureForError ();
1134                 }
1135
1136                 public bool CheckAccessLevel (Type check_type)
1137                 {
1138                         Type tb = TypeBuilder;
1139
1140                         if (this is GenericMethod) {
1141                                 tb = Parent.TypeBuilder;
1142
1143                                 // FIXME: Generic container does not work with nested generic
1144                                 // anonymous method stories
1145                                 if (TypeBuilder == null)
1146                                         return true;
1147                         }
1148
1149                         check_type = TypeManager.DropGenericTypeArguments (check_type);
1150                         if (check_type == tb)
1151                                 return true;
1152
1153                         // TODO: When called from LocalUsingAliasEntry tb is null
1154                         // because we are in RootDeclSpace
1155                         if (tb == null)
1156                                 tb = typeof (RootDeclSpace);
1157
1158                         //
1159                         // Broken Microsoft runtime, return public for arrays, no matter what
1160                         // the accessibility is for their underlying class, and they return
1161                         // NonPublic visibility for pointers
1162                         //
1163                         if (TypeManager.HasElementType (check_type))
1164                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
1165
1166                         if (TypeManager.IsGenericParameter (check_type))
1167                                 return true;
1168
1169                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
1170
1171                         switch (check_attr){
1172                         case TypeAttributes.Public:
1173                                 return true;
1174
1175                         case TypeAttributes.NotPublic:
1176                                 return TypeManager.IsThisOrFriendAssembly (Module.Assembly, check_type.Assembly);
1177
1178                         case TypeAttributes.NestedPublic:
1179                                 return CheckAccessLevel (check_type.DeclaringType);
1180
1181                         case TypeAttributes.NestedPrivate:
1182                                 Type declaring = check_type.DeclaringType;
1183                                 return tb == declaring || TypeManager.IsNestedChildOf (tb, declaring);
1184
1185                         case TypeAttributes.NestedFamily:
1186                                 //
1187                                 // Only accessible to methods in current type or any subtypes
1188                                 //
1189                                 return FamilyAccessible (tb, check_type);
1190
1191                         case TypeAttributes.NestedFamANDAssem:
1192                                 return TypeManager.IsThisOrFriendAssembly (Module.Assembly, check_type.Assembly) &&
1193                                         FamilyAccessible (tb, check_type);
1194
1195                         case TypeAttributes.NestedFamORAssem:
1196                                 return FamilyAccessible (tb, check_type) ||
1197                                         TypeManager.IsThisOrFriendAssembly (Module.Assembly, check_type.Assembly);
1198
1199                         case TypeAttributes.NestedAssembly:
1200                                 return TypeManager.IsThisOrFriendAssembly (Module.Assembly, check_type.Assembly);
1201                         }
1202
1203                         throw new NotImplementedException (check_attr.ToString ());
1204                 }
1205
1206                 static bool FamilyAccessible (Type tb, Type check_type)
1207                 {
1208                         Type declaring = check_type.DeclaringType;
1209                         return TypeManager.IsNestedFamilyAccessible (tb, declaring);
1210                 }
1211
1212                 public bool IsBaseType (Type baseType)
1213                 {
1214                         // We are called from RootDeclspace
1215                         if (TypeBuilder == null)
1216                                 return false;
1217
1218                         return TypeManager.IsSubclassOf (TypeBuilder, baseType);
1219                 }
1220
1221                 private Type LookupNestedTypeInHierarchy (string name)
1222                 {
1223                         Type t = null;
1224                         // if the member cache has been created, lets use it.
1225                         // the member cache is MUCH faster.
1226                         if (MemberCache != null) {
1227                                 t = MemberCache.FindNestedType (name);
1228                                 if (t == null)
1229                                         return null;
1230                         }
1231
1232                         //
1233                         // FIXME: This hack is needed because member cache does not work
1234                         // with nested base generic types, it does only type name copy and
1235                         // not type construction
1236                         //
1237
1238                         // no member cache. Do it the hard way -- reflection
1239                         for (Type current_type = TypeBuilder;
1240                              current_type != null && current_type != TypeManager.object_type;
1241                              current_type = current_type.BaseType) {
1242
1243                                 Type ct = TypeManager.DropGenericTypeArguments (current_type);
1244                                 if (ct is TypeBuilder) {
1245                                         TypeContainer tc = ct == TypeBuilder
1246                                                 ? PartialContainer : TypeManager.LookupTypeContainer (ct);
1247                                         if (tc != null)
1248                                                 t = tc.FindNestedType (name);
1249                                 } else {
1250                                         t = TypeManager.GetNestedType (ct, name);
1251                                 }
1252
1253                                 if ((t == null) || !CheckAccessLevel (t))
1254                                         continue;
1255
1256                                 if (!TypeManager.IsGenericType (current_type))
1257                                         return t;
1258
1259                                 Type[] args = TypeManager.GetTypeArguments (current_type);
1260                                 Type[] targs = TypeManager.GetTypeArguments (t);
1261                                 for (int i = 0; i < args.Length; i++)
1262                                         targs [i] = TypeManager.TypeToCoreType (args [i]);
1263
1264                                 return t.MakeGenericType (targs);
1265                         }
1266
1267                         return null;
1268                 }
1269
1270                 //
1271                 // Public function used to locate types.
1272                 //
1273                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1274                 //
1275                 // Returns: Type or null if they type can not be found.
1276                 //
1277                 public override FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
1278                 {
1279                         FullNamedExpression e;
1280                         if (Cache.TryGetValue (name, out e))
1281                                 return e;
1282
1283                         e = null;
1284                         int errors = Report.Errors;
1285
1286                         TypeParameter[] tp = CurrentTypeParameters;
1287                         if (tp != null) {
1288                                 TypeParameter tparam = TypeParameter.FindTypeParameter (tp, name);
1289                                 if (tparam != null)
1290                                         e = new TypeParameterExpr (tparam, Location.Null);
1291                         }
1292
1293                         if (e == null) {
1294                                 Type t = LookupNestedTypeInHierarchy (name);
1295
1296                                 if (t != null)
1297                                         e = new TypeExpression (t, Location.Null);
1298                                 else if (Parent != null)
1299                                         e = Parent.LookupNamespaceOrType (name, loc, ignore_cs0104);
1300                                 else
1301                                         e = NamespaceEntry.LookupNamespaceOrType (name, loc, ignore_cs0104);
1302                         }
1303
1304                         if (errors == Report.Errors)
1305                                 Cache [name] = e;
1306
1307                         return e;
1308                 }
1309
1310                 /// <remarks>
1311                 ///   This function is broken and not what you're looking for.  It should only
1312                 ///   be used while the type is still being created since it doesn't use the cache
1313                 ///   and relies on the filter doing the member name check.
1314                 /// </remarks>
1315                 ///
1316                 // [Obsolete ("Only MemberCache approach should be used")]
1317                 public virtual MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1318                                                         MemberFilter filter, object criteria)
1319                 {
1320                         throw new NotSupportedException ();
1321                 }
1322
1323                 /// <remarks>
1324                 ///   If we have a MemberCache, return it.  This property may return null if the
1325                 ///   class doesn't have a member cache or while it's still being created.
1326                 /// </remarks>
1327                 public abstract MemberCache MemberCache {
1328                         get;
1329                 }
1330
1331                 public virtual ModuleContainer Module {
1332                         get { return Parent.Module; }
1333                 }
1334
1335                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
1336                 {
1337                         if (a.Type == pa.Required) {
1338                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1339                                 return;
1340                         }
1341                         TypeBuilder.SetCustomAttribute (cb);
1342                 }
1343
1344                 TypeParameter[] initialize_type_params ()
1345                 {
1346                         if (type_param_list != null)
1347                                 return type_param_list;
1348
1349                         DeclSpace the_parent = Parent;
1350                         if (this is GenericMethod)
1351                                 the_parent = null;
1352
1353                         var list = new List<TypeParameter> ();
1354                         if (the_parent != null && the_parent.IsGeneric) {
1355                                 // FIXME: move generics info out of DeclSpace
1356                                 TypeParameter[] parent_params = the_parent.TypeParameters;
1357                                 list.AddRange (parent_params);
1358                         }
1359
1360                         int count = type_params != null ? type_params.Length : 0;
1361                         for (int i = 0; i < count; i++) {
1362                                 TypeParameter param = type_params [i];
1363                                 list.Add (param);
1364                                 if (Parent.CurrentTypeParameters != null) {
1365                                         foreach (TypeParameter tp in Parent.CurrentTypeParameters) {
1366                                                 if (tp.Name != param.Name)
1367                                                         continue;
1368
1369                                                 Report.SymbolRelatedToPreviousError (tp.Location, null);
1370                                                 Report.Warning (693, 3, param.Location,
1371                                                         "Type parameter `{0}' has the same name as the type parameter from outer type `{1}'",
1372                                                         param.Name, Parent.GetSignatureForError ());
1373                                         }
1374                                 }
1375                         }
1376
1377                         type_param_list = new TypeParameter [list.Count];
1378                         list.CopyTo (type_param_list, 0);
1379                         return type_param_list;
1380                 }
1381
1382                 public virtual void SetParameterInfo (List<Constraints> constraints_list)
1383                 {
1384                         if (!is_generic) {
1385                                 if (constraints_list != null) {
1386                                         Report.Error (
1387                                                 80, Location, "Constraints are not allowed " +
1388                                                 "on non-generic declarations");
1389                                 }
1390
1391                                 return;
1392                         }
1393
1394                         TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1395                         type_params = new TypeParameter [names.Length];
1396
1397                         //
1398                         // Register all the names
1399                         //
1400                         for (int i = 0; i < type_params.Length; i++) {
1401                                 TypeParameterName name = names [i];
1402
1403                                 Constraints constraints = null;
1404                                 if (constraints_list != null) {
1405                                         int total = constraints_list.Count;
1406                                         for (int ii = 0; ii < total; ++ii) {
1407                                                 Constraints constraints_at = (Constraints)constraints_list[ii];
1408                                                 // TODO: it is used by iterators only
1409                                                 if (constraints_at == null) {
1410                                                         constraints_list.RemoveAt (ii);
1411                                                         --total;
1412                                                         continue;
1413                                                 }
1414                                                 if (constraints_at.TypeParameter.Value == name.Name) {
1415                                                         constraints = constraints_at;
1416                                                         constraints_list.RemoveAt(ii);
1417                                                         break;
1418                                                 }
1419                                         }
1420                                 }
1421
1422                                 Variance variance = name.Variance;
1423                                 if (name.Variance != Variance.None && !(this is Delegate || this is Interface)) {
1424                                         Report.Error (1960, name.Location, "Variant type parameters can only be used with interfaces and delegates");
1425                                         variance = Variance.None;
1426                                 }
1427
1428                                 type_params [i] = new TypeParameter (
1429                                         Parent, this, name.Name, constraints, name.OptAttributes, variance, Location);
1430
1431                                 AddToContainer (type_params [i], name.Name);
1432                         }
1433
1434                         if (constraints_list != null && constraints_list.Count > 0) {
1435                                 foreach (Constraints constraint in constraints_list) {
1436                                         Report.Error(699, constraint.Location, "`{0}': A constraint references nonexistent type parameter `{1}'",
1437                                                 GetSignatureForError (), constraint.TypeParameter.Value);
1438                                 }
1439                         }
1440                 }
1441
1442                 public TypeParameter[] TypeParameters {
1443                         get {
1444                                 if (!IsGeneric)
1445                                         throw new InvalidOperationException ();
1446                                 if ((PartialContainer != null) && (PartialContainer != this))
1447                                         return PartialContainer.TypeParameters;
1448                                 if (type_param_list == null)
1449                                         initialize_type_params ();
1450
1451                                 return type_param_list;
1452                         }
1453                 }
1454
1455                 public override Type CurrentType {
1456                         get { return currentType != null ? currentType : TypeBuilder; }
1457                 }
1458
1459                 public override TypeContainer CurrentTypeDefinition {
1460                         get { return PartialContainer; }
1461                 }
1462
1463                 public int CountTypeParameters {
1464                         get {
1465                                 return count_type_params;
1466                         }
1467                 }
1468
1469                 // Used for error reporting only
1470                 public virtual Type LookupAnyGeneric (string typeName)
1471                 {
1472                         return NamespaceEntry.NS.LookForAnyGenericType (typeName);
1473                 }
1474
1475                 public override string[] ValidAttributeTargets {
1476                         get { return attribute_targets; }
1477                 }
1478
1479                 protected override bool VerifyClsCompliance ()
1480                 {
1481                         if (!base.VerifyClsCompliance ()) {
1482                                 return false;
1483                         }
1484
1485                         if (type_params != null) {
1486                                 foreach (TypeParameter tp in type_params) {
1487                                         if (tp.Constraints == null)
1488                                                 continue;
1489
1490                                         tp.Constraints.VerifyClsCompliance (Report);
1491                                 }
1492                         }
1493
1494                         var cache = TypeManager.AllClsTopLevelTypes;
1495                         if (cache == null)
1496                                 return true;
1497
1498                         string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1499                         if (!cache.ContainsKey (lcase)) {
1500                                 cache.Add (lcase, this);
1501                                 return true;
1502                         }
1503
1504                         object val = cache [lcase];
1505                         if (val == null) {
1506                                 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1507                                 if (t == null)
1508                                         return true;
1509                                 Report.SymbolRelatedToPreviousError (t);
1510                         }
1511                         else {
1512                                 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1513                         }
1514
1515                         Report.Warning (3005, 1, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1516                         return true;
1517                 }
1518         }
1519 }